JP2005054280A - Paper and support for image recording material and image recording material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide paper and a support for an image recording material having high planarity and to provide the image recording material having high image quality and high glossiness and slightly causing curls of an image forming surface after forming the image. <P>SOLUTION: The paper is characterized in that internal bond strength specified by JAPAN TAPPI No.54 is ≥160 mJ and the center surface average roughness (SRa) under conditions of 0.3-0.4 mm cutoff in at least one surface of the paper is ≤0.9 μm in the paper containing at least base paper. The support for the image recording material is characterized in that the support is composed of the paper. The image recording material is characterized as having at least an image recording layer on the support and using the support for the image recording material as the support. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【００９９】
〔トナー受像層の諸物性〕
前記トナー受像層は、定着部材との定着温度における１８０度剥離強さが、０．１Ｎ／２５ｍｍ以下が好ましく、０．０４１Ｎ／２５ｍｍ以下がより好ましい。
ここで、前記１８０度剥離強さは、定着部材の表面素材を用い、ＪＩＳ Ｋ６８８７に記載の方法に準拠して測定することができる。
前記トナー受像層は、白色度が高いのが好ましい。該白色度としては、ＪＩＳＰ８１２３に規定される方法で測定して、８５％以上が好ましい。また、４４０ｎｍ〜６４０ｎｍの波長域で、分光反射率が８５％以上、かつ同波長域の最大分光反射率と最低分光反射率の差が５％以内が好ましい。更には、４００ｎｍ〜７００ｎｍの波長域で分光反射率が８５％以上、かつ同波長域の最大分光反射率と最低分光反射率の差が５％以内がより好ましい。
また、前記白色度としては、具体的には、ＣＩＥ １９７６（Ｌ^＊ａ^＊ｂ^＊）色空間において、Ｌ^＊値は８０以上が好ましく、８５以上がより好ましく、９０以上が更に好ましい。また、白色色味はできるだけニュートラルであるのが好ましい。前記白色色味としては、Ｌ^＊ａ^＊ｂ^＊空間において、（ａ^＊）^２＋（ｂ^＊）^２の値は５０以下が好ましく、１８以下がより好ましく、５以下が更に好ましい。
【０１００】
前記トナー受像層としては、光沢度が高いのが好ましい。前記光沢度としては、トナーが無い白色から最大濃度の黒色までの全領域において、４５度光沢度は６０以上が好ましく、７５以上がより好ましく、９０以上が更に好ましい。
但し、前記光沢度は１１０以下が好ましい。前記光沢度が、１１０を超えると、金属光沢のようになり、画質としては好ましくない。
尚、前記光沢度は、ＪＩＳ Ｚ８７４１に基づいて測定することができる。
【０１０１】
前記トナー受像層は、平面性が高いのが好ましい。該平滑度としては、トナーが無い白色から最大濃度の黒色までの全領域において、算術平均粗さ（Ｒａ）は３μｍ以下が好ましく、１μｍ以下がより好ましく、０．５μｍ以下が更に好ましい。
なお、前記算術平均粗さは、ＪＩＳ Ｂ０６０１、ＪＩＳ Ｂ０６５１、ＪＩＳ Ｂ０６５２に基づいて測定することができる。
【０１０２】
前記トナー受像層は、以下の項目の内の１項目の物性を有することが好ましく、更に好ましくは、複数の項目、最も好ましくは、全ての項目の物性を有することが適当である。
（１）トナー受像層のＴｍ（溶融温度）は３０℃以上が好ましく、トナーのＴｍ＋２０℃以下がより好ましい。
（２）トナー受像層の粘度が１×１０^５ｃｐになる温度が、４０℃以上が好ましく、トナーのそれより低いことがより好ましい。
（３）トナー受像層の定着温度における貯蔵弾性率（Ｇ’）が、１×１０^２〜１×１０^５Ｐａが好ましい。損失弾性率（Ｇ”）が、１×１０^２〜１×１０^５Ｐａが好ましい。
（４）トナー受像層の定着温度における損失弾性率（Ｇ”）と、貯蔵弾性率（Ｇ’）との比である損失正接（Ｇ”／Ｇ’）は、０．０１〜１０が好ましい。
（５）トナー受像層の定着温度における貯蔵弾性率（Ｇ’）は、トナーの定着温度における貯蔵弾性率（Ｇ”）に対して、−５０〜＋２５００が好ましい。
（６）溶融トナーのトナー受像層上の傾斜角は、５０度以下が好ましく、４０度以下がより好ましい。
また、トナー受像層としては、特許第２７８８３５８号明細書、特開平７−２４８６３７号公報、同８−３０５０６７号公報、同１０−２３９８８９号公報等に開示されている物性等を満足するものが好ましい。
【０１０３】
前記トナー受像層としては、１×１０^６〜１×１０^１５Ω／ｃｍ^２の範囲（２５℃、６５％ＲＨの条件にて）の表面電気抵抗を有するのが好ましい。
前記表面抵抗が、１×１０^６Ω／ｃｍ^２未満であると、トナー受像層にトナーが転写される際のトナー量が充分でなく、得られるトナー画像の濃度が低くなり易いことがあり、１×１０^１５Ω／ｃｍ^２を超えると、転写時に必要以上の電荷が発生し、トナーが充分に転写されず、画像の濃度が低く、電子写真用受像シートの取り扱い中に静電気を帯びて塵埃が付着し易くなることがある。また、複写時にミスフィード、重送、放電マーク、トナー転写ヌケ等が発生することがある。
【０１０４】
尚、前記支持体に対し、トナー受像層と反対側の面の表面電気抵抗としては、５×１０^８〜３．２×１０^１０Ω／ｃｍ^２が好ましく、１×１０^９〜１×１０^１０Ω／ｃｍ^２がより好ましい。
ここで、前記表面電気抵抗の測定は、ＪＩＳ Ｋ６９１１に準拠し、サンプルを温度２０℃、湿度６５％の環境下に８時間以上調湿し、同じ環境下で、アドバンテスト（株）製Ｒ８３４０を使用し、印加電圧１００Ｖの条件で、通電して１分間経過した後に測定することができる。
【０１０５】
−その他の層−
前記その他の層としては、例えば、表面保護層、バック層、中間層、密着改良層、下塗り層、クッション層、帯電調節（防止）層、反射層、色味調製層、保存性改良層、接着防止層、アンチカール層、及び、平滑化層等が挙げられる。これらの層は、単層構成であってもよく、２以上の層より構成されていてもよい。
【０１０６】
前記表面保護層は、前記電子写真用受像シートにおける表面の保護、保存性の改良、取り扱い性の改良、筆記性の付与、機器通過性の改良、アンチオフセット性の付与等の目的で、前記トナー受像層の表面に設けることができる。該表面保護層は、１層であってもよいし、２層以上の層からなっていてもよい。表面保護層には、バインダーとして各種の熱可塑性樹脂、熱硬化性樹脂等を用いることができ、前記トナー受像層と同種の樹脂を用いるのが好ましい。但し、熱力学的特性や、静電特性等は、トナー受像層と同じである必要はなく、各々最適化することができる。
【０１０７】
前記表面保護層には、トナー受像層に使用可能な、前述の各種の添加剤を配合することができる。特に、前記表面保護層には、本発明で使用する離型剤と共に、他の添加剤、例えば、マット剤等を配合することができる。なお、前記マット剤としては、種々の公知のものが挙げられる。
前記電子写真用受像シートにおける最表面層（例えば、表面保護層が形成されている場合には、表面保護層等）としては、定着性の点で、トナーとの相溶性が良いのが好ましい。具体的には、溶融したトナーとの接触角が、例えば０〜４０度が好ましい。
【０１０８】
前記バック層は、前記電子写真用受像シートにおいて、裏面出力適性付与、裏面出力画質改良、カールバランス改良、機器通過性改良等の目的で、支持体に対して、トナー受像層の反対側に設けられるのが好ましい。
前記バック層の色としては、特に制限はないが、前記電子写真用受像シートが、裏面にも画像を形成する両面出力型受像紙の場合、バック層も白色であることが好ましい。白色度及び分光反射率は、表面と同様に８５％以上が好ましい。
また、両面出力適性改良のため、バック層の構成がトナー受像層側と同様であってもよい。バック層には、上記で説明した各種の添加剤を用いることができる。このような添加剤として、特にマット剤や、帯電調整剤等を配合することが適当である。バック層は、単層構成であってもよく、２層以上の積層構成であってもよい。
また、定着時のオフセット防止のため、定着ローラ等に離型性オイルを用いている場合、バック層は、オイル吸収性としてもよい。
【０１０９】
前記密着改良層は、前記電子写真用受像紙において、支持体及びトナー受像層の密着性を改良する目的で、形成するのが好ましい。密着改良層には、前述の各種の添加剤を配合することができ、特に架橋剤を配合するのが好ましい。また、前記電子写真用受像シートには、トナーの受容性を改良するため、該密着改良層及びトナー受像層の間に、更にクッション層等を設けるのが好ましい。
【０１１０】
前記中間層は、例えば、支持体及び密着改良層の間、密着改良層及びクッション層の間、クッション層及びトナー受像層の間、トナー受像層及び保存性改良層との間等に形成することができる。もちろん、支持体、トナー受像層、及び、中間層からなる電子写真用受像シートの場合には、中間層は、例えば、支持体及びトナー受像層の間に存在させることができる。
【０１１１】
〔トナー〕
前記電子写真材料は、印刷又は複写の際に、トナー受像層にトナーを受容させて使用される。
前記トナーは、結着樹脂と着色剤とを少なくとも含有し、必要に応じて離型剤、その他の成分を含有する。
【０１１２】
−トナー 結着樹脂−
前記結着樹脂としては、スチレン、パラクロルスチレンなどのスチレン類；ビニルナフタレン、塩化ビニル、臭化ビニル、弗化ビニル、酢酸ビニル、プロピオン酸ビニル、ベンゾエ酸ビニル、酪酸ビニルなどのビニルエステル類；アクリル酸メチル、アクリル酸エチル、アクリル酸ｎ−ブチル、アクリル酸イソブチル、アクリル酸ドデシル、アクリル酸ｎ−オクチル、アクリル酸２−クロルエチル、アクリル酸フェニル、α−クロルアクリル酸メチル、メタクリル酸メチル、メタクリル酸エチル、メタクリル酸ブチルなどのメチレン脂肪族カルボン酸エステル類；アクリロニトリル、メタクリルロニトリル、アクリルアミドなどのビニルニトリル類；ビニルメチルエーテル、ビニルエチルエーテル、ビニルイソブチルエーテルなどのビニルエーテル類；Ｎ−ビニルピロール、Ｎ−ビニルカルバゾール、Ｎ−ビニルインドール、Ｎ−ビニルピロリドンなどのＮ−ビニル化合物類；メタクリル酸、アクリル酸、桂皮酸などのビニルカルボン酸類などビニル系モノマーの単独重合体やその共重合体、更には各種ポリエステル類を使用することができ、各種ワックス類を併用することも可能である。
これらの樹脂の中で、特に前記トナー受像層に用いたものと同一系統の樹脂を用いるのが好ましい。
【０１１３】
−トナー 着色剤−
前記着色剤としては、通常トナーに用いられているものを制限なく使用することができ、例えば、カーボンブラック、クロムイエロー、ハンザイエロー、ベンジジンイエロー、スレンイエロー、キノリンイエロー、パーメネントオレンジＧＴＲ、ピラゾロンオレンジ、バルカンオレンジ、ウオッチヤングレッド、パーマネントレッド、ブリリアンカーミン３Ｂ、ブリリアンカーミン６Ｂ、デイポンオイルレッド、ピラゾロンレッド、リソールレッド、ローダミンＢレーキ、レーキレッドＣ、ローズベンガル、アニリンブルー、ウルトラマリンブルー、カルコオイルブルー、メチレンブルークロライド、フタロシアニンブルー、フタロシアニングリーン、マラカイトグリーンオクサレレートなどの種々の顔料が挙げられる。また、アクリジン系、キサンテン系、アゾ系、ベンゾキノン系、アジン系、アントラキノン系、チオインジコ系、ジオキサジン系、チアジン系、アゾメチン系、インジコ系、チオインジコ系、フタロシアニン系、アニリンブラック系、ポリメチン系、トリフェニルメタン系、ジフェニルメタン系、チアジン系、チアゾール系、キサンテン系などの各種染料などが挙げられる。これら着色剤は１種単独で使用してもよいし、複数種類を併せて使用してもよい。
前記着色剤の含有量は、２〜８質量％の範囲が好ましい。前記着色剤の含有量が２質量％以上であれば着色力が弱くなることもなく、一方、８質量％以下であれば、透明性が損なわれることもないので好ましい。
【０１１４】
−トナー 離型剤−
前記離型剤としては、原理的には、公知のワックス全てが使用可能であるが、比較的低分子量の高結晶性ポリエチレンワックス、フィッシャートロプシュワックス、アミドワックス、ウレタン化合物など窒素を含有する極性ワックスなどが特に有効である。ポリエチレンワックスについては分子量１０００以下が好ましく、３００〜１０００の範囲がより好ましい。
【０１１５】
前記ウレタン結合を有する化合物は、低分子量であっても極性基による凝集力の強さにより、固体状態を保ち、融点も分子量のわりには高く設定できるので好適である。分子量の好ましい範囲は３００〜１０００である。原料は、ジイソシアン酸化合物類とモノアルコール類との組み合わせ、モノイソシアン酸とモノアルコールとの組み合わせ、ジアルコール類とモノイソシアン酸との組み合わせ、トリアルコール類とモノイソシアン酸との組み合わせ、トリイソシアン酸化合物類とモノアルコール類との組み合わせなど、種々の組み合わせを選択することができが、高分子量化させないために、多官能基と単官能基の化合物を組み合わせることが好ましく、また等価の官能基量となるようにすることが重要である。
【０１１６】
具体的な、原料化合物のうちモノイソシアン酸化合物としては、例えば、イソシアン酸ドデシル、イソシアン酸フェニル及びその誘導体、イソシアン酸ナフチル、イソシアン酸ヘキシル、イソシアン酸ベンジル、イソシアン酸ブチル、イソシアン酸アリルなどが挙げられる。
ジイソシアン酸化合物としては、ジイソシアン酸トリレン、ジイソシアン酸４、４’ジフェニルメタン、ジイソシアン酸トルエン、ジイソシアン酸１、３−フェニレン、ジイソシアン酸ヘキサメチレン、ジイソシアン酸４−メチル−ｍ−フェニレン、ジイソシアン酸イソホロンなどが挙げられる。
モノアルコールとしては、メタノール、エタノール、プロパノール、ブタノール、ペンタノール、ヘキサノール、ヘプタノールなど極く一般的なアルコール類を使用することが可能である。
原料化合物のうちジアルコール類としては、エチレングリコール、ジエチレングリコール、トリエチレングリコール、トリメチレングリコールなど多数のグリコール類；トリアルコール類としては、トリメチロールプロパン、トリエチロールプロパン、トリメタノールエタンなどが使用可能であるが、必ずしもこの範囲に限定されない。
【０１１７】
これらのウレタン化合物類は、通常の離型剤のように、混練時に樹脂や着色剤とともに混合して、混練粉砕型トナーとしても使用できる。また、前記の乳化重合凝集溶融法トナーに用いる場合には、水中にイオン性界面活性剤や高分子酸や高分子塩基などの高分子電解質とともに分散し、融点以上に加熱してホモジナイザーや圧力吐出型分散機で強い剪断をかけて微粒子化し、１μｍ以下の離型剤粒子分散液を調製し、樹脂粒子分散液、着色剤分散液などとともに用いることができる。
【０１１８】
−トナー その他の成分−
また、本発明のトナーには、内添剤、帯電制御剤、無機微粒子等のその他の成分を配合することができる。内添剤としては、フェライト、マグネタイト、還元鉄、コバルト、ニッケル、マンガン等の金属、合金、又はこれら金属を含む化合物などの磁性体を使用することができる。
【０１１９】
前記帯電制御剤としては、４級アンモニウム塩化合物、ニグロシン系化合物、アルミや、鉄、クロムなどの錯体からなる染料、トリフェニルメタン系顔料など通常使用される種々の帯電制御剤を使用することができる。なお、凝集、溶融時の安定性に影響するイオン強度の制御や、廃水汚染を減少する観点から水に溶解しにくい材料が好ましい。
【０１２０】
前記無機微粒子としては、例えば、シリカ、アルミナ、チタニア、炭酸カルシウム、炭酸マグネシウム、リン酸三カルシウムなど、通常、トナー表面の外添剤を全て使用で、それらをイオン性界面活性剤や高分子酸、高分子塩基で分散して使用することが好ましい。
【０１２１】
更に、乳化重合、シード重合、顔料分散、樹脂粒子分散、離型分散、凝集、更には、それらの安定化などに界面活性剤を用いることができる。例えば、硫酸エステル塩系、スルホン酸塩系、リン酸エステル系、せっけん系等のアニオン界面活性剤、アミン塩型、４級アンモニウム塩型等のカチオン系界面活性剤、また、ポリエチレングリコール系、アルキルフェノールエチレンオキサイド付加物系、多価アルコール系等の非イオン性界面活性剤を併用することも効果的である。その際の分散手段としては、回転せん断型ホモジナイザーやメデイアを有するボールミル、サンドミル、ダイノミルなどの一般的なものが使用可能である。
【０１２２】
なお、前記トナーには、必要に応じて更に外添剤を添加してもよい。前記外添剤としては、無機粉末及び有機粒子等が挙げられる。前記無機粒子としては、ＳｉＯ_２、ＴｉＯ_２、Ａｌ_２Ｏ_３、ＣｕＯ、ＺｎＯ、ＳｎＯ_２、Ｆｅ_２Ｏ_３、ＭｇＯ、ＢａＯ、ＣａＯ、Ｋ_２Ｏ、Ｎａ_２Ｏ、ＺｒＯ_２、ＣａＯ・ＳｉＯ_２、Ｋ_２Ｏ・（ＴｉＯ_２）_ｎ、Ａｌ_２Ｏ_３・２ＳｉＯ_２、ＣａＣＯ_３、ＭｇＣＯ_３、ＢａＳＯ_４、ＭｇＳＯ_４等を例示することができる。また、前記有機粒子としては、脂肪酸又はその誘導体や、これ等の金属塩等の粉末、フッ素系樹脂、ポリエチレン樹脂、アクリル樹脂等の樹脂粉末を用いることができる。これらの粉末の平均粒径は、例えば、０．０１〜５μｍが好ましく、０．１〜２μｍがより好ましい。
【０１２３】
前記トナーの製造方法は、特に制限されないが、（ｉ）樹脂粒子を分散させてなる分散液中で凝集粒子を形成し凝集粒子分散液を調製する工程、（ｉｉ）前記凝集粒子分散液中に、微粒子を分散させてなる微粒子分散液を添加混合して前記凝集粒子に前記微粒子を付着させて付着粒子を形成する工程、及び（ｉｉｉ）前記付着粒子を加熱し融合してトナー粒子を形成する工程、とを含むトナーの製造方法により得られるものが好ましい。
【０１２４】
−トナー物性等−
本発明のトナーの体積平均粒子径は、０．５μｍ以上１０μｍ以下が好ましい。
前記トナーの体積平均粒子径が小さすぎると、トナーのハンドリング（補給性、クリーニング性、流動性等）に悪影響が生じる場合があり、また、粒子生産性が低下する場合がある。一方、トナーの体積平均粒子径が大すぎると、粒状性、転写性に起因する画質、解像度に悪影響を与える場合がある。
また、本発明のトナーは、前記トナーの体積平均粒子径範囲を満たし、かつ体積平均粒度分布指数（ＧＳＤｖ）は、１．３以下が好ましい。
前記体積平均粒度分布指数（ＧＳＤｖ）と数平均粒度分布指数（ＧＳＤｎ）との比（ＧＳＤｖ／ＧＳＤｎ）は、０．９５以上が好ましい。
また、本発明のトナーは、前記トナーの体積平均粒子径範囲を満たし、かつ下記式で表される形状係数の平均値は１．００〜１．５０が好ましい。
形状係数＝（π×Ｌ^２）／（４×Ｓ）
ただし、前記式中、Ｌは、トナー粒子の最大長を表す。Ｓは、トナー粒子の投影面積を表す。
トナーが上記条件を満たす場合には、画質、特に、粒状性、解像度に効果があり、また、転写に伴う抜けやブラーが生じにくく、平均粒径が小さくなくてもハンドリング性に悪影響が出にくくなる。
【０１２５】
なお、トナー自体の１５０℃における貯蔵弾性率Ｇ’（角周波数１０ｒａｄ／ｓｅｃで測定）は、１０〜２００Ｐａであることが、定着工程での画質向上とオフセット性の防止の面から適当である。
【０１２６】
＜銀塩写真材料＞
前記銀塩写真材料としては、例えば、前記本発明の画像記録材料用支持体上に、少なくともＹＭＣに発色する画像記録層を設けた構成を有し、焼付露光されたハロゲン化銀写真用シートを複数の処理槽内を浸漬しながら通過することにより、発色現像、漂白定着、水洗を行い、乾燥するハロゲン化銀写真方式、等が挙げられる。
【０１２７】
＜インクジェット記録材料＞
前記インクジェット記録材料としては、例えば、本発明の画像記録材料用支持体上に、水性インク（色材として染料又は顔料を用いたもの）及び油性インク等の液状インクや、常温では固体であり、溶融液状化させて印画に供する固体状インク等を受容できる前記色材受容層を有する。
【０１２８】
＜熱転写材料＞
前記熱転写材料としては、例えば、本発明の前記画像記録材料用支持体上に、少なくとも画像記録層としての熱溶融性インク層を設けた構成を有し、感熱ヘッドにより加熱して熱溶融性インク層からインクを熱転写シート上に溶融転写する方式などが挙げられる。
【０１２９】
＜感熱材料＞
前記感熱材料としては、例えば、本発明の前記画像記録材料用支持体上に、少なくとも熱発色層を設けた構成を有し、感熱ヘッドによる加熱と紫外線による定着の繰り返しにより画像を形成するサーモオートクローム方式（ＴＡ方式）において用いられる感熱材料等が挙げられる。
【０１３０】
＜昇華転写材料＞
前記昇華転写材料としては、例えば、本発明の前記画像記録材料用支持体上に、少なくとも熱拡散性色素（昇華性色素）を含有するインク層を設けた構成を有し、感熱ヘッドにより加熱してインク層から熱拡散性色素を昇華転写シート上に転写する昇華転写方式などが挙げられる。
【０１３１】
＜印刷用紙＞
前記画像記録材料用支持体は、印刷用紙として用いることも好ましい。印刷用紙として用いる場合には、印刷機械によりインク等を塗布する点から、機械強度が高いものが好ましい。
【０１３２】
前記原紙として原紙を用いる場合、紙に填料、柔軟剤、製紙用内添助剤等を含有させるのが好ましい。填料としては、一般に使用されているものが使用でき、例えば、クレー、焼成クレー、珪藻土、タルク、カオリン、焼成カオリン、デラミカオリン、重質炭酸カルシウム、軽質炭酸カルシウム、炭酸マグネシウム、炭酸バリウム、二酸化チタン、酸化亜鉛、酸化ケイ素、非晶質シリカ、水酸化アルミニウム、水酸化カルシウム、水酸化マグネシウム、水酸化亜鉛等の無機填料、尿素−ホルマリン樹脂、ポリスチレン樹脂、フェノール樹脂、微小中空粒子等の有機填料、などが挙げられる。これらは、１種単独で使用してもよく、２種以上を併用してもよい。
【０１３３】
前記製紙用内添助剤としては、例えば、従来から使用されている各種のノニオン性、カチオン性、アニオン性の歩留まり向上剤、濾水度向上剤、紙力向上剤、内添サイズ剤等が挙げられる。具体的には、硫酸バンド、塩化アルミニウム、アルミン酸ソーダ、塩基性塩化アルミニウム、塩基性ポリ水酸化アルミニウム等の塩基性アルミニウム化合物；硫酸第一鉄、硫酸第二鉄等の多価金属化合物、澱粉、加工澱粉、ポリアクリルアミド、尿素樹脂、メラミン樹脂、エポキシ樹脂、ポリアミド樹脂、ポリアミン樹脂、ポリアミン、ポリエチレンイミン、植物ガム、ポリビニルアルコール、ラテックス、ポリエチレンオキサイド等の水溶性高分子、親水性架橋ポリマー粒子分散物及びこれらの誘導体或いは変成物等の各種化合物が例示でき、これらの物質は前記製紙用内添助剤としての機能のいくつかを同時に有するものである。
【０１３４】
次に、内添サイズ剤としての機能が著しいものとしては、アルキルケテンダイマー系化合物、アルケニル無水コハク酸系化合物、スチレン−アクリル系化合物、高級脂肪酸系化合物、石油樹脂系サイズ剤やロジン系サイズ剤が挙げられる。
【０１３５】
更に、染料、蛍光増白剤、ｐＨ調整剤、消泡剤、ピッチコントロール剤、スライムコントロール剤等の抄紙用内添剤を用途に応じて適宜添加してもよい。
【０１３６】
前記印刷用紙は、オフセット印刷用紙として特に好適であり、その他にも凸版印刷用紙、グラビア印刷用紙、電子写真用紙として使用することが可能である。
【０１３７】
本発明の画像記録用材料は、画像形成した後の画像形成面が高画質で、高い光沢性を有し、更にはカールの発生が少なく、電子写真材料、感熱材料、インクジェット記録材料、昇華転写材料、銀塩写真材料、熱転写材料等に好適なものである。
【０１３８】
【実施例】
以下、本発明の実施例について説明するが、本発明はこれらの実施例に何ら限定されるものではない。
なお、以下の実施例及び比較例において、「％」及び「部」は、それぞれ「質量％」及び「質量部」を表す。
【０１３９】
（実施例１）
−画像記録材料用支持体の調製−
広葉樹晒クラフトパルプ（ＬＢＫＰ）をディスクリファイナーで２８０ｍｌ（カナダ標準ろ水度、Ｃ．Ｓ．Ｆ．）まで叩解し、繊維長０．６０ｍｍのパルプ紙料を作製した。
このパルプ紙料にパルプ質量を基準として、カチオンスターチ１．６質量％、アルキルケテンダイマー（ＡＫＤ）０．４質量％、アニオンポリアクリルアミド０．３質量％、エポキシ化脂肪酸アミド（ＥＦＡ）０．２質量％、及びポリアミドポリアミンエピクロルヒドリン０．２質量％の割合となるように添加した。なお、前記アルキルケテンダイマーのアルキル部分は、ベヘン酸を主体とする脂肪酸に由来する。前記エポキシ化脂肪酸アミドの脂肪酸部分は、ベヘン酸を主体とする脂肪酸に由来する。
【０１４０】
得られたパルプ紙料を手漉きシートマシンを用いて、絶乾坪量１４０ｇ／ｍ^２、水分量が６８％の湿紙を作製した。
得られた湿紙の両面を濾紙ではさみ、ウェットプレス装置により脱水し、水分量を４７％に調整した。
脱水後の湿紙を、前記プレスドライ処理として図１に示すプレスドライ装置（ＶＡＬＭＥＴ社製、Ｓｔａｔｉｃ Ｃｏｎｄｅｂｅｌｔ）を用いて乾燥し、乾燥後の水分量が７．０％の原紙を作製した。前記プレスドライ処理は、原紙の画像記録層を設ける面側（表面）に接する上部プレートの温度を１５０℃に調整し、原紙の画像記録層を設けない面側（裏面）に接する下部プレートの温度を８５℃に調整し、プレス圧０．４ＭＰａ、乾燥時間１秒の条件で行った。
【０１４１】
その後、前記プレスドライ処理した原紙をソフトカレンダー装置を用いて、画像記録層を設ける面側（表面）に表面温度２５０℃の金属ロール、反対面の樹脂ロールの表面温度を４０℃に設定して、カレンダー処理を行った。得られた前記画像記録材料用支持体としての紙の密度は０．９６ｇ／ｃｍ^３であった。
【０１４２】
（実施例２〜４及び比較例１〜６）
実施例１において、表１に示す条件に変えた以外は、実施例１と同様にして、実施例２〜４及び比較例１〜６の前記画像記録材料用支持体としての紙を作製した。
【０１４３】
【表１】

【０１４４】
次に、得られた実施例１〜４及び比較例１〜６の各紙（画像記録材料用支持体）について、以下のようにして、内部結合強さ及び平面性の評価を行った。結果を表２に示す。
【０１４５】
＜内部結合強さの評価＞
ＪＡＰＡＮ ＴＡＰＰＩ Ｎｏ．５４に準拠して内部結合強さを測定した。
＜平面性の評価＞
表面形状測定装置サーフコム５７０Ａ−３ＤＦ（株式会社東京精密製）を用いて、下記測定及び解析条件に基づき、カットオフ０．３ｍｍ〜０．４ｍｍ条件下での前記画像記録材料用支持体の画像記録層を設ける側の中心面平均粗さ（ＳＲａ）を測定した。
−測定及び解析条件−
・走査方向：サンプルのＭＤ方向
・測定長さ：抄紙（Ｘ）方向５０ｍｍ、その垂直（Ｙ）方向３０ｍｍ
・測定ピッチ：Ｘ方向０．１ｍｍ、Ｙ方向０．１ｍｍ
・走査速度：３０ｍｍ／ｓｅｃ
・バンドパスフィルター：０．３〜０．４ｍｍ
〔評価基準〕
Ａ・・・非常に優れている（ＳＲａが０．８μｍ以下である）
Ｂ・・・優れている（ＳＲａが０．８μｍ以上０．９５μｍ未満である）
Ｃ・・・中間である（ＳＲａが０．９６μｍ以上１．１μｍ未満である）
Ｄ・・・劣る（ＳＲａが１．１μｍ以上である）
【０１４６】
【表２】

【０１４７】
（実施例５〜８及び比較例７〜１２）
実施例１〜４及び比較例１〜６の各紙（画像記録材料用支持体）を用いて、下記方法により実施例５〜８及び比較例７〜１２の各電子写真用受像紙を作製した。
【０１４８】
−二酸化チタン分散液−
二酸化チタン（タイペーク（登録商標）Ａ−２２０、石原産業製）４０．０ｇ、ＰＶＡ１０２（株式会社クラレ製）２．０ｇ、及びイオン交換水５８．０ｇを混合し、日本精機製作所製ＮＢＫ−２を用いて分散させて二酸化チタン分散液（二酸化チタン顔料含有量が４０質量％）を作製した。
【０１４９】
−トナー受像層用塗布液の調製−
前記二酸化チタン分散液１５．５ｇ、カルナバワックス分散液（セロゾール５２４、中京油脂（株）製）１５．０ｇ、ポリエステル樹脂水分散物（固形分３０質量％、ＫＺＡ−７０４９、ユニチカ製）１００．０ｇ、増粘剤（アルコックスＥ３０、明成化学製）２．０ｇ、アニオン界面活性剤（ＡＯＴ）０．５ｇ、及びイオン交換水８０ｍｌを混合し、攪拌してトナー受像層用塗布液を調製した。
得られたトナー受像層用塗布液の粘度は、４０ｍＰａ・ｓであり、表面張力は３４ｍＮ／ｍであった。
【０１５０】
−バック層用塗布液の調製−
下記の成分を混合し、攪拌して、バック層用塗布液を調製した。
アクリル樹脂水分散物（固形分３０質量％、ハイロスＸＢＨ−９９７Ｌ、星光化学製）１００．０ｇ、マット剤（テクポマーＭＢＸ−１２、積水化成品工業（株）製）５．０ｇ、離型剤（ハイドリンＤ３３７、中京油脂（株）製）１０．０ｇ、増粘剤（ＣＭＣ）２．０ｇ、アニオン界面活性剤（ＡＯＴ）０．５ｇ、及びイオン交換水８０ｍｌを混合し、撹拌してバック層用塗布液を調製した。
得られたバック層用塗布液の粘度は、３５ｍＰａ・ｓであり、表面張力は、３３ｍＮ／ｍであった。
【０１５１】
−バック層及びトナー受像層の塗工−
前記実施例１〜４及び比較例１〜６の各画像記録材料用支持体における裏面（トナー受像層を設けない側の表面）に、前記バック層用塗布液をバーコーターで乾燥質量が９ｇ／ｍ^２となるように塗布し、バック層を形成した。また、前記各画像記録材料用支持体の表面に、前記トナー受像層塗布液を、バーコーターにて乾燥質量が１２ｇ／ｍ^２となるように塗布し、トナー受像層を形成した。なお、トナー受像層中の顔料の含有量は、熱可塑性樹脂に対して５質量％であった。
【０１５２】
前記バック層及び前記トナー受像層は、塗布した後、オンラインで熱風により乾燥した。前記乾燥は、バック層及びトナー受像層ともに塗布後２分間以内に乾燥するように、乾燥風量及び温度を調整した。なお、乾燥点は、塗布表面温度が乾燥風の湿球温度と同じ温度となる点とした。
次いで、乾燥後、カレンダー処理を行った。前記カレンダー処理は、グロスカレンダーを用い、金属ローラを４０℃に保温した状態で、ニップ圧１４．７ｋＮ／ｍ（１５ｋｇｆ／ｃｍ）の条件で行った。
【０１５３】
得られた各電子写真用受像紙をＡ４に裁断し、電子写真用プリンターを用いて画像をプリントした。使用したプリンターは、定着部を図３に示すベルト定着装置１とした富士ゼロックス（株）製カラーレーザープリンター（ＤｏｃｕＣｏｌｏｒ １２５０−ＰＦ）を用いた。
即ち、図３に示すベルト定着装置１では、加熱ローラ３と、テンションローラ５とにわたって定着ベルト２が懸架され、テンションローラ５には、その上方で、定着ベルト２を介して、クリーニングローラ６が設けられ、更に、加熱ローラ３の下方には、定着ベルト２を介して、加圧ローラ４が設けられている。トナー潜像を有する電子写真用受像紙は、図３において、右側から、加熱ローラ３と、加圧ローラ４との間に挿入され、定着され、次いで、定着ベルト２に載って移動し、その過程で、冷却装置７によって冷却され、最後に、クリーニングローラ６で清浄化される。
前記ベルト定着装置１においては、定着ベルト２の搬送速度は、３０ｍｍ／秒であり、加熱ローラ３と加圧ローラ４との間のニップ圧力は、０．２ＭＰａ（２ｋｇｆ／ｃｍ^２）であり、加熱ローラ３の設定温度は、１５０℃であり、これが定着温度に相当する。なお、加圧ローラ４の設定温度は、１２０℃に設定した。
【０１５４】
得られた各電子写真プリントについて、以下のようにして、画質、光沢性及びカール性を評価した。結果を表３に示す。
【０１５５】
＜画質＞
各電子写真プリントの画質を目視で観察し、下記基準に基づいて、画質の最も良好なものをＡとして、次いで、Ｂ、Ｃ、Ｄ、Ｅとランク付けし、評価した。
〔評価基準〕
Ａ・・・非常に優れている（高画質記録材料として有効）
Ｂ・・・優れている（高画質記録材料として有効）
Ｃ・・・中間（高画質記録材料として不可）
Ｄ・・・劣る（高画質記録材料として不可）
Ｅ・・・非常に劣る（高画質記録材料として不可）
【０１５６】
＜光沢性＞
各電子写真プリントの光沢性を目視で観察し、下記基準に基づいて、光沢の最も良好なものをＡとして、次いで、Ｂ、Ｃ、Ｄ、Ｅとランク付けし、評価した。
〔評価基準〕
Ａ・・・非常に優れている（高画質記録材料として有効）
Ｂ・・・優れている（高画質記録材料として有効）
Ｃ・・・中間（高画質記録材料として不可）
Ｄ・・・劣る（高画質記録材料として不可）
Ｅ・・・非常に劣る（高画質記録材料として不可）
【０１５７】
＜カール性＞
各電子写真プリントのカールを目視で観察し、下記基準に基づいて、カールの最も少ないものをＡとして、次いで、Ｂ、Ｃ、Ｄ、Ｅとランク付けし、評価した。
〔評価基準〕
Ａ・・・カールが認められない（高画質記録材料として有効）
Ｂ・・・僅かながらカールが認められるが問題ないレベル（高画質記録材料として有効）
Ｃ・・・カールが認められる（高画質記録材料として不可）
Ｄ・・・大きなカールが認められる（高画質記録材料として不可）
Ｅ・・・非常に大きなカールが認められる（高画質記録材料として不可）
【０１５８】
【表３】

【０１５９】
（実施例９〜１２及び比較例１３〜１８）
−写真印画紙−
実施例１〜４及び比較例１〜６で作製した各画像記録材料用支持体の画像記録層を設ける側の面（表面）にゼラチンを０．１ｇ／ｍ^２塗布し、該ゼラチン塗布面に、イエロー発色カラー写真用ハロゲン化銀ゼラチン乳剤層（１０ｇ／ｍ^２）、ゼラチン中間層、マゼンタ発色カラー写真用ハロゲン化銀ゼラチン乳剤層（１０ｇ／ｍ^２）、ゼラチン中間層、シアン発色カラー写真用ハロゲン化銀ゼラチン乳剤層（１０ｇ／ｍ^２）、ゼラチン保護層をこの順に重層塗布し、実施例９〜１２及び比較例１３〜１８の各写真印画紙を作製した。
【０１６０】
得られた各写真印画紙を露光、現像処理し、写真プリントを得た。各写真プリントの画面の表面平面性（微小凹凸（１ｍｍ以下））、及び表面平面性（うねり凹凸（５〜６ｍｍ））を下記方法により評価した。結果を表４に示す。
【０１６１】
＜表面平面性（微小凹凸（１ｍｍ以下）＞
各写真プリントを目視で観察し、下記基準に基づいて、表面平面性（微小凹凸（１ｍｍ以下）の最も良好なものをＡとして、次いで、Ｂ、Ｃ、Ｄ、Ｅとランク付けし、評価した。
〔評価基準〕
Ａ・・・非常に優れている（高画質記録材料として有効）
Ｂ・・・優れている（高画質記録材料として有効）
Ｃ・・・中間（高画質記録材料として不可）
Ｄ・・・劣る（高画質記録材料として不可）
Ｅ・・・非常に劣る（高画質記録材料として不可）
【０１６２】
＜表面平面性（うねり凹凸（５〜６ｍｍ）＞
各写真プリントを目視で観察し、下記基準に基づいて、表面平面性（うねり凹凸（５〜６ｍｍ）の最も良好なものをＡとして、次いで、Ｂ、Ｃ、Ｄ、Ｅとランク付けし、評価した。
〔評価基準〕
Ａ・・・非常に優れている（高画質記録材料として有効）
Ｂ・・・優れている（高画質記録材料として有効）
Ｃ・・・中間（高画質記録材料として不可）
Ｄ・・・劣る（高画質記録材料として不可）
Ｅ・・・非常に劣る（高画質記録材料として不可）
【０１６３】
【表４】

【０１６４】
【発明の効果】
本発明によると、高い平面性を有する紙及び画像記録材料用支持体、並びに、画像形成した後の画像形成面が高画質で、高い光沢性を有し、更にはカールの発生が少ない画像記録材料を提供することができる。
【図面の簡単な説明】
【図１】図１は、本発明のプレスドライ処理装置の一例を示す概略図である。
【図２】図２は、本発明のプレスドライ処理を製造ラインとして行う場合のプレスドライ装置の一例を示す概略図である。
【図３】図３は、実施例で使用したプリンターにおけるベルト定着装置の概要構成図である。
【符号の説明】
１ ベルト定着装置
２ 定着ベルト
３ 加熱ローラ
４ 加圧ローラ
５ テンションローラ
６ クリーニングローラ
７ 冷却装置
３８ 無端ベルト
３９ 無端ベルト
４０ パルプ紙料
４１ 織物
４２ 上部プレート
４３ 下部プレート
４４ ジャケット
４５ 油圧用オイル
４６ 冷却水
４７ 加熱用オイル
４８ 加圧機
４９ 真空タンク
５１ 第１回転ローラ
５２ 第１回転ローラ
５３ 第２回転ローラ
５４ 第２回転ローラ
５５ 熱室
５６ 冷却室
１００ プレスドライ装置
２００ プレスドライ装置[0001]
BACKGROUND OF THE INVENTION
The present invention is excellent in flatness and suitable for papers suitable for image recording material supports, as well as the above-mentioned images suitable for electrophotographic materials, heat-sensitive materials, ink-jet recording materials, sublimation transfer materials, silver salt photographic materials, thermal transfer materials and the like. The present invention relates to a recording material support and an image recording material.
[0002]
[Prior art]
Conventionally, as a support for various image recording materials such as electrophotographic materials, heat sensitive materials, ink jet recording materials, sublimation transfer materials, silver salt photographic materials, thermal transfer materials, for example, base paper, synthetic paper, synthetic resin sheet, coat Paper, laminated paper, etc. are well known. In order to form an image using the image recording material and obtain an image print having high image quality and high glossiness, high flatness of the image recording material is required. High flatness is also required for the body.
Various proposals have been made to meet the above requirements. For example, density 0.8-1.0 g / cm containing polyolefin synthetic pulp³A proposal has been made for a support for an image recording material in which an intermediate layer containing a white pigment is provided on a base paper (see Patent Document 1). Further, there has been proposed a support for an image recording material having an internal bond strength of 0.9 to 2.2 Kg · cm and a friction coefficient in the range of 0.6 to 1.2 ( Patent Document 2). In addition, a support for an image recording material having a glossiness of 20% or more and a center surface average roughness (SRa) of 0.75 μm or less when measured under conditions of a cutoff of 5 to 7 mm is proposed. (See Patent Document 3). Further, the support for an image recording material, wherein the average degree of polymerization of the pulp is 800 or more, the internal bond strength of the base paper is 1.0 to 2.0 kgf · cm, and the pH of the base paper is 6.0 or more. Has been proposed (see Patent Document 4).
[0003]
However, when the strength of the support for image recording material is weak, when an image is formed using the image recording material having the support for image recording material, curling occurs in the image print output from the printer. There is a problem that it ends up. On the other hand, when the flatness of the image recording material support is low, there is a problem that an image having high image quality and high gloss cannot be formed. In addition, the support for the image recording material is a natural material such as natural pulp of conifers (hereinafter sometimes referred to as “coniferous pulp”) or natural pulp of broadleaf trees (hereinafter sometimes referred to as “hardwood pulp”). Pulp is produced by drying wet paper with a hand-made machine or paper machine. The image recording support produced in this way shrinks the pulp fibers of the natural pulp that is the raw material during the drying. As a result, there is a problem that the flatness is deteriorated.
In any of the above proposals, it cannot be said that these problems have been sufficiently solved, and the image recording material support having high flatness and the image recording material support have been provided and after the image formation. At present, no image recording material having an image forming surface with high image quality, high gloss, and curling is not yet provided, and development of these materials is eagerly desired.
[0004]
[Patent Document 1]
Japanese Patent Publication No. 6-55545
[Patent Document 2]
Japanese Patent Laid-Open No. 11-11004
[Patent Document 3]
JP 2001-301098 A
[Patent Document 4]
Japanese Patent No. 2671154
[0005]
[Problems to be solved by the invention]
An object of the present invention is to meet the above-mentioned demand, to solve the above-described problems, and to achieve the following object. That is, the present invention relates to a paper and image recording material support having high flatness, and an image having a high image quality, high gloss, and less curling after the image is formed. An object is to provide a recording material.
[0006]
[Means for Solving the Problems]
Means for solving the problems are as follows. That is,
<1> In a paper including at least a base paper, the JAPAN TAPPI No. 54, the internal bond strength is 160 mJ or more, and the center plane average roughness (SRa) under the condition of a cut-off of 0.3 to 0.4 mm on at least one surface of the paper is 0. The paper is characterized by being 9 μm or less. In the paper according to <1>, since the internal bond strength and the center plane average roughness (SRa) are within a predetermined range, the paper has high flatness and is suitable for the image forming material support. Can be used.
<2> The paper according to <1>, wherein the internal bond strength is 200 mJ or more.
<3> The paper according to any one of <1> to <2>, wherein the internal bond strength is 216 mJ or more.
<4> The paper according to any one of <1> to <3>, wherein the base paper includes hardwood pulp.
<5> The paper according to <4>, wherein the content of the hardwood pulp relative to the paper is 50% by mass or more.
<6> The paper according to any one of <1> to <5>, which is subjected to a press-drying process. In the paper according to <6>, density, elastic modulus, tensile strength, strength, and the like are improved by the press-drying treatment and drying, and dimensional stability and flatness are excellent. A paper with less generation is obtained.
<7> The paper according to any one of <1> to <6>, which is subjected to a press dry process and a calendar process. In the paper according to <7>, density, elastic modulus, tensile strength, strength, and the like are improved by the press-drying treatment and drying, and dimensional stability and flatness are excellent. A paper having a low glossiness can be obtained, and a paper having high gloss can be obtained by the calendar treatment.
<8> Any of the above <6> to <7>, wherein the center plane average roughness (SRa) under the condition of a cut-off of 0.3 to 0.4 mm on the press-dried surface is 0.9 μm or less It is the paper described in.
<9> Density is 0.85 to 1.05 g / cm³The paper according to any one of <1> to <8>.
<10> A support for an image recording material comprising the paper according to any one of <1> to <9>. The image recording support described in <10> is made of the paper, and thus has excellent flatness and can be suitably used as an image forming material.
<11> An image recording material having at least an image recording layer on a support, wherein the image recording material support according to <10> is used as the support. . In the image recording material according to <11>, by using the image recording support as the support, when an image is formed using the image recording material, the image forming surface has high image quality and high gloss. Therefore, it is possible to obtain an image print having a low curl.
<12> The image recording material according to <11>, wherein the image recording material is selected from electrophotographic materials, heat-sensitive materials, inkjet recording materials, sublimation transfer materials, silver salt photographic materials, and thermal transfer materials.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
(paper)
The paper of the present invention includes at least a base paper, and the JAPAN TAPPI No. of the paper. 54, the internal bond strength is 160 mJ or more, and the center plane average roughness (SRa) under the condition of a cut-off of 0.3 to 0.4 mm on at least one surface of the paper is 0. 9 μm or less.
[0008]
The internal bond strength is measured according to JAPAN TAPPI No. 54 is an internal bond strength defined in 54.
The internal bond strength is not particularly limited as long as it is 160 mJ or more, and can be appropriately selected according to the purpose. For example, 200 or more is preferable, and 216 or more is more preferable.
[0009]
The center plane average roughness (SRa) is an average roughness obtained by three-dimensionally scanning a certain plane roughness, and a centerline average roughness obtained by scanning a plane linear roughness. This is a different concept from (Ra). As the roughness at the cut-off 0.3 to 0.4 mm decreases, the surface looks flat when viewed. There is no restriction | limiting in particular as a model used for the measurement of the said center plane average roughness (SRa), According to the objective, it can select suitably, For example, Surfcom 570A-3DF (made by Tokyo Seimitsu Co., Ltd.) is used. Then, based on the following measurement and analysis conditions, the center plane average roughness (SRa) can be measured under the conditions of the cutoff of 0.3 to 0.4 mm.
-Measurement and analysis conditions-
・ Scanning direction: MD direction of sample
・ Measurement length: 50 mm in papermaking (X) direction, 30 mm in its vertical (Y) direction
・ Measurement pitch: 0.1 mm in the X direction, 0.1 mm in the Y direction
・ Scanning speed: 30mm / sec
・ Band pass filter: 0.3-0.4mm
The central surface average roughness (SRa) is not particularly limited as long as it is 0.9 μm or less under the condition of a cutoff of 0.3 to 0.4 mm, and can be appropriately selected according to the purpose. 0.8 μm or less is preferable, and 0.75 μm or less is more preferable.
[0010]
The requirement of the center plane average roughness (SRa) is not particularly limited as long as it satisfies at least one surface of the paper. However, when the paper is used as the image recording material support, the image recording material It is preferable that the surface of the support on the side where the image recording layer is provided satisfies the requirement of the center plane average roughness (SRa).
[0011]
The paper is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include base paper, synthetic paper, synthetic resin sheet, coated paper, and laminated paper.
Examples of the base paper include high-quality paper, and paper described in, for example, “Photographic Engineering Basics-Silver Salt Photo Edition” edited by the Japan Photographic Society, pages 223-240 of Corona Publishing Co., Ltd. (Showa 54). Are mentioned as preferred.
The raw material of the base paper is not particularly limited and can be appropriately selected depending on the purpose. For example, synthetic pulp made of plastic materials such as softwood pulp, hardwood pulp, polyethylene, polypropylene, or natural pulp and synthetic pulp And the like.
[0012]
As the pulp that can be used as the raw material of the base paper, the hardwood pulp is preferable from the viewpoint of improving the flatness and dimensional stability of the base paper at the same time in a well-balanced and sufficient level, but the softwood pulp is used. You can also
Examples of the hardwood pulp include hardwood bleached kraft pulp (LBKP) and hardwood sulfite pulp (LBSP). Among these, hardwood bleached kraft pulp (LBKP) is preferable.
There is no restriction | limiting in particular as content of the said hardwood pulp with respect to the said paper, Although it can select suitably according to the objective, For example, 50% or more is preferable, 60% or more is more preferable, 75% or more is still more preferable. .
[0013]
Examples of the softwood pulp include softwood bleached kraft pulp (NBKP).
As the pulp, it is preferable to mainly use hardwood pulp having a short fiber length.
A beater, refiner, or the like can be used to beat the pulp. Various additives can be further added to the pulp slurry obtained after beating the pulp (hereinafter sometimes referred to as “pulp stock”), if necessary. Examples of the additive include a filler, a dry paper strength enhancer, a sizing agent, a wet paper strength enhancer, a fixing agent, a pH adjuster, and other agents.
[0014]
Examples of the filler include calcium carbonate, clay, kaolin, white clay, talc, titanium oxide, diatomaceous earth, barium sulfate, aluminum hydroxide, and magnesium hydroxide.
Examples of the dry paper strength enhancer include cationized starch, cationized polyacrylamide, anionized polyacrylamide, amphoteric polyacrylamide, and carboxy-modified polyvinyl alcohol.
Examples of the sizing agent include fatty acid salts, rosin derivatives such as rosin and maleated rosin, paraffin wax, alkyl ketene dimer, alkenyl succinic anhydride (ASA), compounds containing higher fatty acids such as epoxidized fatty acid amide, and the like. Can be mentioned.
Examples of the wet paper strength enhancer include polyamine polyamide epichlorohydrin, melamine resin, urea resin, and epoxidized polyamide resin.
Examples of the fixing agent include polyvalent metal salts such as aluminum sulfate and aluminum chloride, and cationic polymers such as cationized starch.
Examples of the pH adjuster include caustic soda and sodium carbonate.
As said other chemical | medical agent, an antifoamer, dye, a slime control agent, a fluorescent whitening agent, etc. are mentioned, for example.
Furthermore, a softening agent etc. can also be added as needed. Examples of the softening agent are described in New Paper Processing Handbook (edited by Paper Medicine Time), pages 554 to 555 (issued in 1980).
[0015]
The treatment liquid used for the surface sizing treatment may contain, for example, a water-resistant substance, a pigment, and the like.
Examples of the water resistant material include latex / emulsions such as styrene-butadiene copolymer, ethylene-vinyl acetate copolymer, polyethylene, vinylidene chloride copolymer, and polyamide polyamine epichlorohydrin.
Examples of the pigment include calcium carbonate, clay, kaolin, talc, barium sulfate, and titanium oxide.
[0016]
The base paper has a longitudinal Young's modulus (Ea) to lateral Young's modulus (Eb) ratio (Ea / Eb) of 1.5 to 1.5 for the purpose of improving the rigidity and dimensional stability of the image recording material support. 2.0 is preferred. In the range where the Ea / Eb value is less than 1.5 or more than 2.0, the rigidity and dimensional stability of the support for the image recording material are liable to be deteriorated, and the running property during transportation is hindered. May be.
[0017]
The Oken type smoothness on the surface of the base paper on the side where the image recording layer is provided is preferably 210 seconds or more, and more preferably 250 seconds or more. When the Oken smoothness is less than 210 seconds, the image quality may be poor. The upper limit of the Oken smoothness is not particularly limited, and is usually preferably 600 seconds or less, and more preferably 500 seconds or less.
Here, the Oken-type smoothness is measured according to JAPAN TAPPI No. 5 Means the smoothness specified by the B method.
[0018]
In general, paper “strain” varies based on the beating style, and the elastic force (rate) of paper made after beating is used as an important factor to express the degree of paper “strain”. Can do. In particular, the elastic modulus of paper is measured by measuring the speed of sound propagating through the paper, using the relationship between the dynamic elastic modulus and density, which indicates the physical properties of the viscoelastic material of the paper, and using an ultrasonic vibration element. Can be obtained from the following equation.
E = ρc²(1-n²)
In the above formula, E represents a dynamic elastic modulus. ρ represents density. c represents the speed of sound in the paper. n represents a Poisson's ratio.
[0019]
In the case of normal paper, since n = about 0.2, even if it is calculated by the following formula, it can be calculated without much difference.
E = ρc²
Therefore, if the density and sound speed of paper can be measured, the elastic modulus can be easily obtained. In the above mathematical formula, when measuring the speed of sound, for example, various known devices such as Sonic Tester SST-110 (manufactured by Nomura Corporation) can be used.
[0020]
There is no restriction | limiting in particular in the thickness of the said base paper, Although it can select suitably according to the objective, 30-500 micrometers is preferable, 50-300 micrometers is more preferable, 100-250 micrometers is still more preferable. The basis weight of the base paper is, for example, 50 to 250 g / m.²Is preferable, 100-200 g / m²Is more preferable.
[0021]
In order to impart a desired centerline average roughness to the surface of the base paper, for example, as disclosed in JP-A-58-68037, a fiber length distribution (for example, a 24 mesh screen residue, It is preferable to use pulp fibers having a total of 42 mesh screen residue, for example, 20 to 45% by mass and 24 mesh screen residue of 5% by mass or less. Further, the center line average roughness can be adjusted by applying heat and pressure to the surface with a machine calendar, a super calendar, or the like.
[0022]
The density of the paper is not particularly limited and may be appropriately selected depending on the intended purpose. For example, 0.8 g / cm³Or more, preferably 0.85 to 1.05 g / cm³More preferred.
[0023]
-Press dry treatment-
The press-drying treatment is not particularly limited as long as it can soften the paper fibers, allow the paper fibers to approach each other, and can be heat-dried while pressing the pulp stock, and is appropriately selected according to the purpose. can do. As the press-drying treatment, for example, the pulp paper stock is dehydrated by a hand-made machine, and the moisture content before the press-drying treatment is adjusted to 30 to 70% using a wet press device or the like, and the moisture content is adjusted. It is preferable to treat the drying temperature of the surface of the base paper on the side where the image recording layer is provided at 100 to 200 ° C.
[0024]
The moisture content of the base paper before the press-drying treatment is preferably 30 to 70%, more preferably 40 to 60%.
The water content after the press-drying treatment is not particularly limited and can be appropriately selected according to the purpose, but is preferably 10% or less, and more preferably 3 to 8%.
[0025]
The drying temperature of the surface of the base paper on the side where the image recording layer is provided is preferably 100 to 200 ° C, more preferably 110 to 180 ° C. When the drying temperature is less than 100 ° C., moisture does not evaporate sufficiently, the interfiber bonding becomes insufficient, and paper strength may not be obtained. In some cases, size and flatness may not be sufficient.
The press pressure in the press-drying process is preferably 0.05 to 0.5 MPa. When the pressing pressure is less than 0.05 MPa, the flow of fibers is small, and thus the flatness may be insufficient. When the pressing pressure exceeds 0.5 MPa, partial density unevenness may occur.
The density of the press-dried base paper is 0.8 g / cm.³Or more, preferably 0.9 g / cm³The above is more preferable. The density of the base paper is 0.8 g / cm³If it is less than this, the planarity may be insufficient.
[0026]
The apparatus for performing the press-drying treatment is not particularly limited and can be appropriately selected according to the purpose. For example, as a research purpose not on a production line, the Condebelt drying method shown in FIG. The press-drying apparatus 100 is suitable.
The press drying apparatus 100 includes an upper plate 42, a lower plate 43, and a jacket 44 between the upper and lower plates, and includes other members as necessary.
[0027]
In the drying using the press-drying apparatus 100, the pulp paper stock is hand-machined, and the wet paper (not shown) dehydrated using a wet press apparatus or the like is placed in a jacket 44 that does not allow air to pass through. This is performed by heating and drying and pressurizing with the upper plate 42 and the lower plate 43 whose temperature is controlled by the oil 47 heated by flowing. During pressure drying, water vapor generated from the wet paper is removed by the vacuum tank 49. Pressurization is performed by applying pressure to the lower plate 43 with the pressurizer 48 using the hydraulic oil 45. Further, the cooling water 46 is configured to flow into the apparatus during pressure drying.
As the press-drying apparatus, for example, “StaticConvert” manufactured by VALMET, etc. can be used.
[0028]
In addition, when the press dry process is incorporated into the production line and the process is continuously performed, the press dry apparatus 200 shown in FIG. 2 is preferably used.
The press-drying apparatus 200 shown in FIG. 2 is arranged such that the first endless belt 38 and the second endless belt 39 that do not allow air to pass therethrough and guide heat well, and the first endless belt 38 rotates around the first endless belt 38. First rotating rollers 51 and 52, and second rotating rollers 53 and 54 arranged so that the second endless belt 39 rotates around the first rotating rollers 51 and 52.
The first endless belt 38 and the second endless belt 39 are disposed so that the endless belts travel in a part of a path parallel to each other so as to form a dry region therebetween.
The first endless belt 38 is heated in the heat chamber 55, and the second endless belt 39 is cooled in the cooling chamber 56.
Then, the dehydrated wet paper 40 and at least one fabric 41 forming an endless loop are brought into contact with the heated first endless belt 38 and the dehydrated wet paper 40 is in contact with the dehydrated wet paper. It is introduced between the belts 38 and 39 so as to be between the paper 40 and the second endless belt 39 to be cooled and the guide roller for guiding the endless fabric, and is configured to be pressure-dried. Yes.
The details of the press-drying apparatus 200 are described in, for example, JP-T 2000-500536.
According to the press-drying apparatus, it is possible to achieve a good press-drying effect that is more efficient than conventional ones.
[0029]
The base paper is subjected to press-drying treatment as described above, whereby density, elastic modulus, tensile strength, strength, etc. are improved, dimensional stability and flatness are excellent, and an image recording material with less curling is generated. A high-quality image can be formed by using the support.
[0030]
Specifically, the glossiness of the image recording material support is preferably 20% or more and more preferably 40% or more at 20 ° glossiness. When the glossiness is less than 20%, glossiness after image formation may be insufficient.
Here, the 20-degree glossiness can be measured based on JIS Z8741.
[0031]
Specifically, the water resistance of the image recording material support is 10 g / m at a hump size water absorption (30 seconds).²The following is preferred, 5 g / m²The following is more preferable, 4 g / m²The following is more preferable.
The bump size water absorption is a value obtained by measuring the amount of water supplied when pure water is brought into contact with a sample for 30 seconds according to JIS P8140.
[0032]
-Calendar processing-
The paper is preferably calendered after the press-dry treatment.
The calendering treatment is not particularly limited and may be appropriately selected according to the purpose. However, high-temperature soft calendering treatment is preferable, and the surface temperature of the metal roll is preferably 110 ° C. or higher, more preferably 150 ° C. or higher. Preferably, 250 degreeC or more is further more preferable. The upper limit temperature is suitably about 300 ° C., for example.
By performing the calendar process, a paper having high gloss can be obtained.
[0033]
The paper of the present invention obtained as described above has high flatness and can be used for various applications, but is particularly preferably used as a support for an image recording material.
[0034]
(Image recording material)
The image recording material of the present invention has at least a support and an image recording layer provided on the support, and the support is the support for an image recording material of the present invention.
The image recording material varies depending on the use and type of the image recording material, and examples thereof include an electrophotographic material, a heat sensitive material, an ink jet recording material, a sublimation transfer material, a silver salt photographic material, and a thermal transfer material.
[0035]
<Electrophotographic materials>
The electrophotographic material has the support for image recording material of the present invention and at least one toner image-receiving layer provided on at least one surface of the support, and other layers appropriately selected as necessary, For example, surface protection layer, intermediate layer, undercoat layer, cushion layer, charge control (prevention) layer, reflection layer, tint preparation layer, storage stability improvement layer, adhesion prevention layer, anti-curl layer, smoothing layer, etc. It becomes. Each of these layers may have a single layer structure or a laminated structure.
[0036]
[Toner image receiving layer]
The toner image receiving layer is a toner image receiving layer for receiving color or black toner and forming an image. The toner image-receiving layer has a function of receiving toner that forms an image from a developing drum or an intermediate transfer member by static electricity, pressure, or the like in a transfer process, and fixing it by heat, pressure, or the like in a fixing process.
[0037]
The toner image-receiving layer has a light transmittance of preferably 78% or less, more preferably 73% or less, and even more preferably 72% or less, from the viewpoint that the electrophotographic material has a photographic feel.
Here, the light transmittance can be measured by separately forming a coating film having the same thickness on a polyethylene terephthalate film (100 μm) and using the direct reading haze meter (Suga Test Instruments HGM-2DP). it can.
[0038]
The material of the toner image-receiving layer contains at least a thermoplastic resin and, if necessary, other components.
[0039]
-Thermoplastic resin-
The thermoplastic resin is not particularly limited as long as it can be deformed under temperature conditions such as fixing and can accept the toner, and can be appropriately selected according to the purpose. And the same type of resins are preferred. In many of the toners, polyester resins, copolymer resins such as styrene and styrene-butyl acrylate are used. In this case, polyester resins, styrene and styrene are also used as thermoplastic resins for the electrophotographic image receiving paper. -It is preferable to use a copolymer resin such as butyl acrylate, more preferably 20% by mass or more of a copolymer resin such as polyester resin, styrene, or styrene-butyl acrylate. Polymers, styrene-acrylic acid ester copolymers, styrene-methacrylic acid ester copolymers and the like are also preferable.
[0040]
Specific examples of the thermoplastic resin include, for example, (a) a resin having an ester bond, (b) a polyurethane resin, (c) a polyamide resin, (d) a polysulfone resin, (e) a polyvinyl chloride resin, and the like. (F) Polyvinyl butyral, (g) Polycaprolactone resin, (h) Polyolefin resin, and the like.
[0041]
Examples of the resin having an ester bond (b) include terephthalic acid, isophthalic acid, maleic acid, fumaric acid, phthalic acid, adipic acid, sebacic acid, azelaic acid, abietic acid, succinic acid, trimellitic acid, and pyromellitic acid. Dicarboxylic acid components such as acids (these dicarboxylic acid components may be substituted with sulfonic acid groups, carboxyl groups, etc.) and diether derivatives of ethylene glycol, diethylene glycol, propylene glycol, bisphenol A, bisphenol A (for example, Bisphenol A ethylene oxide 2 adducts, bisphenol A propylene oxide 2 adducts, etc.), bisphenol S, 2-ethylcyclohexyldimethanol, neopentyl glycol, cyclohexyldimethanol, glycerin, etc. Polyacrylic acid ester resins such as polyester resins, polymethyl methacrylate, polybutyl methacrylate, polymethyl acrylate, polybutyl acrylate, etc. obtained by condensation with the alcohol component (these alcohol components may be substituted with hydroxyl groups, etc.) Alternatively, polymethacrylic acid ester resin, polycarbonate resin, polyvinyl acetate resin, styrene acrylate resin, styrene-methacrylic acid ester copolymer resin, vinyl toluene acrylate resin, and the like can be given.
Specific examples include those described in JP-A Nos. 59-101395, 63-7971, 63-7972, 63-7773, and 60-294862.
[0042]
Examples of commercially available polyester resins include Toyobo's Byron 290, Byron 200, Byron 280, Byron 300, Byron 103, Byron GK-140, Byron GK-130; Kao's Tufton NE-382, Tufton U- 5, ATR-2009, ATR-2010; Elitel UE3500, UE3210, XA-8153 manufactured by Unitika; Polyester TP-220, R-188 manufactured by Nippon Synthetic Chemical Co., Ltd.
Commercially available products of the acrylic resin include Mitsubishi Rayon Co., Ltd. Dianal SE-5437, SE-5102, SE-5377, SE-5649, SE-5466, SE-5482, HR-169, 124, HR-1127. , HR-116, HR-113, HR-148, HR-131, HR-470, HR-634, HR-606, HR-607, LR-1065, 574, 143, 396, 637, 162, 469, 216 , BR-50, BR-52, BR-60, BR-64, BR-73, BR-75, BR-77, BR-79, BR-80, BR-83, BR-85, BR-87, BR -88, BR-90, BR-93, BR-95, BR-100, BR-101, BR-102, BR-105, BR-106, BR-107, BR- 08, BR-112, BR-113, BR-115, BR-116, BR-117; Sreck P SE-0020, SE-0040, SE-0070, SE-0100, SE-1010, SE- manufactured by Sekisui Chemical Co., Ltd. 1035; Sanyo Chemical Industries Himer ST95, ST120; FM601 manufactured by Mitsui Chemicals.
[0043]
Examples of the (e) polyvinyl chloride resin include polyvinylidene chloride resin, vinyl chloride-vinyl acetate copolymer resin, vinyl chloride-vinyl propionate copolymer resin, and the like.
Examples of (f) polyvinyl butyral include cellulose resins such as polyol resin, ethyl cellulose resin, and cellulose acetate resin. Examples of commercially available products include those manufactured by Denki Kagaku Kogyo Co., Ltd. and Sekisui Chemical Co., Ltd. The polyvinyl butyral preferably has a polyvinyl butyral content of 70% by mass or more, an average polymerization degree of 500 or more, and more preferably an average polymerization degree of 1000 or more.
Examples of commercially available products include Denka Butyral 3000-1, 4000-2, 5000A, 6000C manufactured by Denki Kagaku Kogyo Co., Ltd .; S-REC BL-1, BL-2, BL-3, BL-S, BX manufactured by Sekisui Chemical Co., Ltd. -L, BM-1, BM-2, BM-5, BM-S, BH-3, BX-1, BX-7, and the like.
Examples of the (g) polycaprolactone resin include styrene-maleic anhydride resin, polyacrylonitrile resin, polyether resin, epoxy resin, phenol resin, and the like.
Examples of the (h) polyolefin resin include polyethylene resins, polypropylene resins, copolymer resins of olefins such as ethylene and propylene and other vinyl monomers, acrylic resins, and the like.
[0044]
The said thermoplastic resin may be used individually by 1 type, may be 2 or more types, In addition to these, these mixtures, these copolymers, etc. can also be used.
[0045]
The thermoplastic resin is preferably one that can satisfy the following properties of the toner image-receiving layer in the state where the toner image-receiving layer is formed, more preferably one that can satisfy the above-mentioned properties of the toner image-receiving layer even with the resin alone. It is also preferable to use two or more resins having different layer properties.
[0046]
As the thermoplastic resin, those having a larger molecular weight than the thermoplastic resin used in the toner are preferable. However, the molecular weight described above is not necessarily preferable depending on the relationship between the thermodynamic properties of the thermoplastic resin used in the toner and the resin used in the toner image-receiving layer. For example, when the softening temperature of the resin used in the toner image receiving layer is higher than that of the thermoplastic resin used in the toner, the molecular weight is the same or the resin used in the toner image receiving layer is the same. Smallness may be preferred.
[0047]
It is also preferable to use a mixture of resins having the same composition and different average molecular weights as the thermoplastic resin. Further, as the relationship with the molecular weight of the thermoplastic resin used in the toner, the relationship disclosed in JP-A-8-334915 is preferable.
The molecular weight distribution of the thermoplastic resin is preferably wider than the molecular weight distribution of the thermoplastic resin used in the toner.
Examples of the thermoplastic resin include JP-B-5-127413, JP-A-8-194394, JP-A-8-334915, JP-A-8-334916, JP-A-9-171265, and JP-A-10. Those satisfying the physical properties disclosed in the publication No. 221877 / etc. Are preferred.
[0048]
Specifically, the thermoplastic resin preferably has physical properties of one of the following items, more preferably a plurality of items, and most preferably all physical properties. .
(1) It is preferable that the weight average molecular weight (Mwa) of the thermoplastic resin and the average molecular weight (Mwb) of the thermoplastic resin used in the toner satisfy the following formula: Mwa−Mwb ≧ 10000.
(2) It is preferable that the melting inclination angle of the thermoplastic resin with the thermoplastic resin used in the toner at the fixing temperature of the toner is 40 degrees or less.
(3) The flow start temperature of the thermoplastic resin is preferably 0 to 10 ° C. higher than the flow start temperature of the thermoplastic resin used for the toner.
(4) The storage elastic modulus (Ep) of the thermoplastic resin and the storage elastic modulus (Et) of the thermoplastic resin used in the toner are represented by the following formula: −50 Pa <(Ep) − (Et) <2500 Pa, It is preferable to satisfy.
[0049]
The thermoplastic resin used for the toner image-receiving layer is particularly preferably an aqueous resin such as a water-soluble resin or a water-dispersible resin for the following reasons (i) to (ii).
(I) The organic solvent is not discharged in the coating and drying process, and is excellent in environmental suitability and work suitability.
(Ii) Many release agents such as wax are difficult to dissolve in a solvent at room temperature, and are often dispersed in a solvent (water, organic solvent) in advance. Further, the water dispersion form is more stable and more suitable for the production process. Furthermore, the water-based coating is more likely to cause the wax to bleed onto the surface during the coating and drying process, and the effects of the release agent (offset resistance, adhesion resistance, etc.) can be easily obtained.
[0050]
As the water-based resin, if it is a water-soluble resin or a water-decomposable resin, its composition, bond structure, molecular structure, molecular weight, molecular weight distribution, and form are not specified. Examples of the water-based group of the polymer include a sulfonic acid group, a hydroxyl group, a carboxylic acid group, an amino group, an amide group, or an ether group.
Examples of the water-soluble resin include Research Disclosure No. 17,643, page 26, No. 18,716, page 651, No. 307,105, pages 873-874, and JP-A No. 64-13546. 71) to those described on pages (75) to (75).
Specifically, vinyl pyrrolidone-vinyl acetate copolymer, styrene-vinyl pyrrolidone copolymer, styrene-maleic anhydride copolymer, water-soluble polyester, water-soluble acrylic, water-soluble polyurethane, water-soluble nylon, water-soluble epoxy Resin can be used. Further, the gelatin may be selected from so-called demineralized gelatin in which the content of lime-processed gelatin, acid-processed gelatin, calcium, or the like is reduced in accordance with various purposes, and is preferably used in combination. Commercially available as water-soluble polyester, various plus coats manufactured by Teraoh Chemical Industry Co., Ltd .; Dainippon Ink Chemicals Co., Ltd. Finetex ES series; Finetex 6161, K-96; Hiros NL-1189, BH-997L manufactured by Seiko Chemical Industry, and the like.
[0051]
Examples of water-dispersible resins include water-dispersed resins such as water-dispersed acrylic resins, water-dispersed polyester resins, water-dispersed polystyrene resins, and water-dispersed urethane resins; acrylic resin emulsions, polyvinyl acetate emulsions, and SBR (styrene / butadiene). -Rubber) Emulsions such as emulsions, resins and emulsions in which the thermoplastic resins (a) to (h) above are dispersed in water, or their copolymers, mixtures, and cationically modified ones are appropriately selected. Two or more types can be combined.
Commercially available products of the water-dispersible resin include, for example, Toyobo's Bironal series, Takamatsu Yushi pesresin A series, Kao Tufton UE series, Nippon Synthetic Polyester WR series, Unitika Eliere series, and acrylic series. Then, high loss XE, KE, PE series manufactured by Seiko Chemical Industry, Jurimer ET series manufactured by Nippon Pure Chemical Co., Ltd. and the like can be mentioned.
The film formation temperature (MFT) of the polymer used is preferably room temperature or higher for storage before printing, and preferably 100 ° C. or lower for fixing of toner particles.
[0052]
The thickness of the toner image-receiving layer is suitably ½ or more, preferably 1 to 3 times the particle diameter of the toner used. The toner image receiving layer preferably has a thickness disclosed in JP-A-5-216322 and JP-A-7-301939. Specifically, the thickness of the toner image receiving layer is, for example, preferably 1 to 50 μm, and more preferably 5 to 15 μm.
[0053]
As a component other than the thermoplastic resin in the toner image receiving layer, the light transmittance of the toner image receiving layer can be easily adjusted within the numerical range, and in particular, the whiteness of the toner image receiving layer can be adjusted. Colorants such as pigments and dyes are preferred, and pigments are particularly preferred. In addition, the other components include various additives added for the purpose of improving the thermodynamic properties of the toner image-receiving layer, such as plasticizers, mold release agents or slip agents, matting agents, fillers, and crosslinking agents. , Charge control agents, emulsions, dispersions and the like.
[0054]
The content of the thermoplastic resin in the toner image-receiving layer is preferably 50% by mass or more, and more preferably 50 to 90% by mass.
[0055]
-Colorant-
Examples of the colorant include fluorescent brighteners, white pigments, colored pigments, dyes, and the like.
The fluorescent whitening agent is a compound that absorbs in the near ultraviolet region and emits fluorescence at 400 to 500 nm, and various known fluorescent whitening agents can be used without particular limitation. Examples of the optical brightener include K.I. Preferable examples include the compounds described in “The Chemistry of Synthetic Dies” edited by Veen Rataraman, Vol. Specific examples include stilbene compounds, coumarin compounds, biphenyl compounds, benzoxazoline compounds, naphthalimide compounds, pyrazoline compounds, carbostyril compounds, and the like. As a commercial item of the said fluorescent whitening agent, Sumitomo Chemical white fur fur PSN, PHR, HCS, PCS, B; UVITEX-OB made from Ciba-Geigy etc. are mentioned, for example.
[0056]
As said white pigment, inorganic pigments, such as a titanium oxide and a calcium carbonate, can be used, for example.
Examples of the colored pigment include various pigments and azo pigments described in JP-A-63-44653 (for example, azo lake; carmine 6B, red 2B, insoluble azo; monoazo yellow, disazo yellow, pyrazolo orange, vulcan orange, Condensed azo series; chromophyl yellow, chromophthal red), polycyclic pigments (eg, phthalocyanine series; copper phthalocyanine blue, copper phthalocyanine green, dioxazine series; dioxazine violet, isoindolinone series; isoindolinone yellow, slen series Perylene, perinone, flavantron, thioindigo, lake pigment (eg, malachite green, rhodamine B, rhodamine G, Victoria blue B), and inorganic pigment (eg, oxide, titanium dioxide, bengara, sulfate); Um, carbonate; precipitated calcium carbonate, succinate; hydrous succinate, anhydrous succinate, metal powder; aluminum powder, bronze powder, zinc dust, carbon black, yellow lead, bitumen, etc.) .
These may be used alone or in combination of two or more. Among these, titanium oxide is particularly preferable as the pigment.
[0057]
Although there is no restriction | limiting in particular as a shape of the said pigment, It is preferable that it is a hollow particle shape at the point which is excellent in the heat conductivity at the time of image fixing (low heat conductivity).
[0058]
As the dye, various dyes such as oil-soluble dyes and water-insoluble dyes can be used.
Examples of the oil-soluble dye include anthraquinone compounds and azo compounds.
Examples of the water-insoluble dye include C.I. I. Vat violet 1, C.I. I. Vat violet 2, C.I. I. Vat violet 9, C.I. I. Vat violet 13, C.I. I. Vat violet 21, C.I. I. Vat Blue 1, C.I. I. Vat Blue 3, C.I. I. Vat Blue 4, C.I. I. Vat Blue 6, C.I. I. Vat Blue 14, C.I. I. Vat Blue 20, C.I. I. Vat dyes such as Vat Blue 35; I. Dispers Violet 1, C.I. I. Disperse Violet 4, C.I. I. Disperse Violet 10, C.I. I. Disperse Blue 3, C.I. I. Disperse Blue 7, C.I. I. Disperse dyes such as Disperse Blue 58; I. Solvent Violet 13, C.I. I. Solvent Violet 14, C.I. I. Solvent Violet 21, C.I. I. Solvent Violet 27, C.I. I. Solvent Blue 11, C.I. I. Solvent Blue 12, C.I. I. Solvent Blue 25, C.I. I. Solvent Blue 55, and the like.
A colored coupler used in silver salt photography can also be preferably used.
[0059]
Content of the colorant in the toner image receiving layer (surface) (g / m²) As 0.1 to 8 g / m²Is preferably 0.5 to 5 g / m²Is more preferable.
The content of the colorant is 0.1 g / m²If it is less than 1, the light transmittance in the toner image-receiving layer may increase, and 8 g / m²If it exceeds 1, handling properties such as cracking and adhesion resistance may deteriorate.
Further, among the colorants, as described above, the addition amount of the pigment is preferably less than 40% by mass, more preferably 30% by mass or less, based on the mass of the thermoplastic resin constituting the toner image receiving layer. A mass% or less is more preferable.
[0060]
-Release agent-
The release agent is blended in the toner image receiving layer in order to prevent the toner image receiving layer from being offset. The release agent is heated and melted at the fixing temperature, deposited on the surface of the toner image-receiving layer, unevenly distributed on the surface of the toner image-receiving layer, and further cooled and solidified to form a release agent material on the surface of the toner image-receiving layer. If it forms a layer, there will be no restriction | limiting in particular, According to the objective, it can select suitably.
Examples of the release agent include at least one selected from a silicone compound, a fluorine compound, a wax, and a matting agent. Among these, at least one selected from silicone oil, polyethylene wax, carnauba wax, silicone particles, and polyethylene wax particles is particularly preferable.
[0061]
Specifically, as the mold release agent, for example, compounds described in “Summary and Application of Revised Wax” by Kosshobo and Silicone Handbook published by Nikkan Kogyo Shimbun, Ltd. can be used. JP-B-59-38581, JP-B-4-32380, Patent Nos. 2838498, 2949558, JP-A-50-117433, 52-52640, 57-148755, 61-62056. 61-62057, 61-118760, JP-A-2-42451, 3-41465, 4-212175, 4-214570, 4-263267, 5-34966, 5-119514, 6-59502, 6-161150, 6-175396, 6-219040, 6-230600, 6-295093, 7-36210, 7 -43940, 7-56387, 7-56390, 7-64335, 7-199682, 7-223362 7-287413, 8-184992, 8-227180, 8-248671, 8-248799, 8-248801, 8-278663, 9-152939, 9 -160278, 9-185181, 9-319139, 9-319143, 10-20549, 10-48889, 10-198069, 10-207116, 11-2917 No. 11-44969, No. 11-65156, No. 11-73049, No. 11-194542, and the silicone compounds, fluorine compounds, and waxes used in the toners are also preferably used. . Further, a plurality of these compounds can be used in combination.
[0062]
Examples of the silicone compounds include non-modified silicone oils as silicone oils (specifically, dimethylsiloxane oil, methyl hydrogen silicone oil, phenylmethyl silicone oil, commercially available products KF-96 and KF-96L manufactured by Shin-Etsu Chemical Co., Ltd.). KF-96H, KF-99, KF-50, KF-54, KF-56, KF-965, KF-968, KF-994, KF-995, HIVAC F-4, F-5; Toray Dow Corning SH200, SH203, SH490, SH510, SH550, SH710, SH704, SH705, SH7028A, SH7036, SM7060, SM7001, SM7706, SH7036, SH8710, SH1107, SH8627; Toshiba TSF 00, TSF401, TSF404, TSF405, TSF431, TSF433, TSF434, TSF437, TSF450 series, TSF451 series, TSF456, TSF458 series, TSF483, TSF484, TSF4045, TSF4300, TSF4600, YF33 series, YF-3057, YF-3800 3802, YF-3804, YF-3807, YF-3897, XF-3905, XS69-A1753, TEX100, TEX101, TEX102, TEX103, TEX104, TSW831, etc., amino-modified silicone oil (KF manufactured by Shin-Etsu Chemical Co., Ltd. as a commercial product) -857, KF-858, KF-859, KF-861, KF-864, KF-880, Toray Dow Corning Ricone SF8417, SM8709, Toshiba Silicone TSF4700, TSF4701, TSF4702, TSF4703, TSF4704, TSF4705, TSF4706, TEX150, TEX151, TEX154, etc., carboxy-modified silicone oil (Toray Dow Corning Silicone BY16-880, commercially available products) Toshiba silicone TSF4770, XF42-A9248, etc.), carbinol modified silicone oil (commercially available Toshiba Silicone XF42-B0970 etc.), vinyl modified silicone oil (commercially available Toshiba Silicone XF40-A1987 etc.), epoxy modified silicone oil (As commercial products, Toray Dow Corning Silicone SF8411, SF8413; Toshiba Silicone T F3965, TSF4730, TSF4732, XF42-A4439, XF42-A4438, XF42-A5041, XC96-A4462, XC96-A4463, XC96-A4464, TEX170, etc., polyether-modified silicone oil (KF-351 manufactured by Shin-Etsu Chemical Co., Ltd. as a commercial product) (A), KF-352 (A), KF-353 (A), KF-354 (A), KF-355 (A), KF-615 (A), KF-618, KF-945 (A); Toray Dow Corning Silicone SH3746, SH3771, SF8421, SF8419, SH8419, SH8410; Toshiba Silicone TSF4440, TSF4441, TSF4445, TSF4446, TSF4450, TSF4452, TSF4453, TSF4 60), silanol-modified silicone oil, methacryl-modified silicone oil, mercapto-modified silicone oil, alcohol-modified silicone oil (commercially available products include Toray Dow Corning Silicone SF8427, SF8428, Toshiba Silicone TSF4750, TSF4751 and XF42-B0970) , Alkyl-modified silicone oil (SF8416 made by Toray Dow Corning Silicone, TSF410, TSF411, TSF4420, TSF4421, TSF4422, TSF4450, XF42-334, XF42-A3160, XF42-A3161, etc. made by Toshiba Silicone) Oil (commercially available Toray Dow Corning Silicone FS1265, Toshiba Silicone FQF 501), silicone rubber and silicone fine particles (Toray Dow Corning Silicone SH851U, SH745U, SH55UA, SE4705U, SH502UA & B, SRX539U, SE6770U-P, DY38-038, DY38-047, Trefill F-201, F -202, F-250, R-900, R-902A, E-500, E-600, E-601, E-506, BY29-119; Toshiba Silicone Tospearl 105, 120, 130, 145, 240, 3120 Etc.), silicone-modified resins (specifically, olefin resins, polyester resins, vinyl resins, polyamide resins, cellulose resins, phenoxy resins, vinyl chloride-vinyl acetate resins, urethane resins, acrylic resins, styrene-acrylic resins) As a commercial product, such as a compound obtained by modifying these copolymer resins with silicone, etc. Asahi Seika's Dialomer SP203V, SP712, SP2105, SP3023; Nippon Oil & Fats Modiper FS700, FS710, FS720, FS730, FS770; -270, US-350, US-352, US-380, US-413, US-450, Reseda GP-705, GS-30, GF-150, GF-300; Toray Dow Corning Silicone SH997, SR2114 , SH2104, SR2115, SR2202, DCI-2577, SR2317, SE4001U, SRX625B, SRX643, SRX439U, SRX488U, SH804, SH840, SR2107, SR2115; Toshiba series YR3370, TSR1122, TSR102, TSR108, TSR116, TSR117, TSR125A, TSR127B, TSR144, TSR180, TSR187, YR47, YR3187, YR3224, YR3232, YR3270, YR3286, YR3340, XR1365, TE2 , Reactive silicone compounds (specifically, there are addition reaction type, peroxide curable type, ultraviolet curable type, and TSR1500, TSR1510, TSR1511, TSR1515, TSR1520, YR3286, YR3340, PSA6574, manufactured by Toshiba Silicones as commercially available products. TPR6500, TPR6501, TPR6600, TPR6702, TPR6604, TPR670 0, TPR6701, TPR6705, TPR6707, TPR6708, TPR6710, TPR6712, TPR6721, TPR6722, UV9300, UV9315, UV9425, UV9430, XS56-A2775, XS56-A2982, XS56-A3075, XS56-A3969, XS56X80 XS56-B1794, SL6100, SM3000, SM3030, SM3200, YSR3022, etc.).
[0063]
Examples of the fluorine compound include fluorine oil (Daikin Industries # 1, # 3, # 10, # 20, # 50, # 100, Unidyne TG-440, TG-452, TG-490, TG as commercially available products). -560, TG-561, TG-590, TG-652, TG-670U, TG-991, TG-999, TG-3010, TG-3020, TG-3510; TF-100, MF-110 manufactured by Tochem Products , MF-120, MF-130, MF-160, MF-160E; Asahi Glass Surflon S-111, S-112, S-113, S-121, S-131, S-132, S-141, S- 145; Mitsui Fluorochemicals FC-430, FC-431, etc.), fluoro rubber (Toray Dow Corning Silicone L as a commercial product) 63U, etc.), fluorine-modified resin (Nippon Yushi Modiper F200, F220, F600, F2020, F3035; Dainichi Seika's Dialomers FF203, FF204; Asahi Glass Surflon S-381, S-383, S-393, SC -101, SC-105, KH-40, SA-100; manufactured by Tochem Products EF-351, EF-352, EF-801, EF-802, EF-601, TFE, TFEA, TFEMA, PDFOH; manufactured by Sumitomo 3M THV-200P, etc.), fluorine sulfonic acid compounds (commercially available products from Tochem Products such as EF-101, EF-102, EF-103, EF-104, EF-105, EF-112, EF-121, EF-122A, EF-122B, EF-122C, EF-123A, EF-12 B, EF-125M, EF-132, EF-135M, EF-305, FBSA, KFBS, LFBS, etc.), fluorosulfonic acid, fluoric acid compounds and salts (specifically, anhydrous hydrofluoric acid, dilute hydrofluoric acid, borohydrofluoric acid) , Zinc borofluoride, nickel borofluoride, tin borofluoride, lead borofluoride, copper borofluoride, silicofluoric acid, potassium fluorotitanate, perfluorocaprylic acid, ammonium perfluorooctanoate), inorganic fluoride (specifically Is aluminum fluoride, potassium silicofluoride, potassium fluoride zirconate, zinc fluoride tetrahydrate, calcium fluoride, lithium fluoride, barium fluoride, tin fluoride, potassium fluoride, acidic potassium fluoride, fluoride Magnesium, fluorinated titanic acid, fluorinated zirconic acid, ammonium hexafluorophosphate, hexafluorophosphoric acid Potassium etc.).
[0064]
Examples of the wax include synthetic hydrocarbons, modified waxes, hydrogenated waxes, natural waxes, and the like.
[0065]
Examples of the synthetic hydrocarbon include polyethylene wax (as commercial products, Polylon A, 393, H-481, manufactured by Chukyo Yushi Co., Ltd., Sanyo Kasei Sun Wax E-310, E-330, E-250P, LEL-250, LEL- 800, LEL-400P, etc.), polypropylene wax (commercially available Sanyo Chemical Co., Ltd. Biscol 330-P, 550-P, 660-P), Fischer-Tropsch wax (commercially available products such as Nippon Seiki FT100, FT-0070, etc.) , Acid amide compounds or acid imide compounds (specifically, stearamide, phthalimide anhydride, etc., commercially available products such as Chukyo Oil & Fats Cellosol 920, B-495, High Micron G-270, G-110, Hydrin D- 757) and the like.
[0066]
Examples of the modified wax include amine-modified polypropylene (QN-7700 manufactured by Sanyo Chemical Co., Ltd. as a commercial product), acrylic acid-modified, fluorine-modified, olefin-modified wax, and urethane type wax (NPS-6010 manufactured by Nippon Seiki Co., Ltd. as a commercial product). -5090), alcohol type wax (NPS-9210, NPS-9215, OX-1949, XO-020T, etc., manufactured by Nippon Seiki) and the like.
[0067]
Examples of the hydrogenated wax include hardened castor oil (as a commercially available product, castor wax from Ito Oil Co., Ltd.), castor oil derivatives (dehydrated castor oil DCO, DCO Z-1, DCO Z-3, castor from Ito Oil as commercial products). Oil fatty acid CO-FA, ricinoleic acid, dehydrated castor oil fatty acid DCO-FA, dehydrated castor oil fatty acid epoxy ester D-4 ester, castor oil-based urethane acrylate CA-10, CA-20, CA-30, castor oil derivative MINERASOL S -74, S-80, S-203, S-42X, S-321, Special castor oil-based condensed fatty acid MINERASOL RC-2, RC-17, RC-55, RC-335, Special castor oil-based condensed fatty acid ester MINERASOL LB-601, LB-603, LB-604, LB-702, L B-703, # 11, L-164, etc.), stearic acid (12-hydroxystearic acid made by Ito Oil as a commercial product), lauric acid, myristic acid, palmitic acid, behenic acid, sebacic acid (as commercial products) Sebacic acid from Ito Oil), undecylenic acid (such as undecylenic acid from Ito Oil as a commercial product), heptylic acid (such as heptyl acid from Ito Oil as a commercial product), maleic acid, highly maleated oil (as a commercial product) HIMALIN DC-15, LN-10, 00-15, DF-20, SF-20, etc., manufactured by Ito Oil Co., Ltd., blown oil (commercially available, Celbonol # 10, # 30, # 60, R-40 manufactured by Ito Oil Co., Ltd.) , S-7, etc.), cyclopentadiene oil (CP oil, CP oil-S, etc. made by Ito Oil Co., Ltd. as commercial products) and the like.
[0068]
The natural wax is preferably at least one selected from plant waxes, animal waxes, mineral waxes and petroleum waxes, particularly preferably plant waxes. As the natural wax, a water-dispersed wax is particularly preferable from the viewpoint of compatibility when a water-based thermoplastic resin is used as the thermoplastic resin of the toner image-receiving layer.
[0069]
Examples of the plant wax include carnauba wax (Nippon Seiki EMUSTAR-0413, Chukyo Yushi Cellosol 524, etc. as commercial products), castor oil (commercially available Ito Oil refined castor oil, etc.), rapeseed oil, large Examples include bean oil, wax, cotton wax, rice wax, sugarcane wax, candelilla wax, Japan wax, jojoba oil, and the like. Among these, in particular, it has an excellent offset resistance, adhesion resistance, paper permeability, glossiness, is resistant to cracking, and can provide an electrophotographic image-receiving sheet capable of forming a high-quality image. Is particularly preferably a carnauba wax having a temperature of 70 to 95 ° C.
Examples of the animal wax include beeswax, lanolin, spermaceti, stew wax (whale oil), and wool wax.
[0070]
Examples of the mineral wax include, for example, montan wax, montan ester wax, ozokerite, ceresin, and fatty acid ester (commercially available products are Nippon Sanka's Sansosizer DOA, AN-800, DINA, DIDA, DOZ, DOS, TOTM, TITM. , E-PS, nE-PS, E-PO, E-4030, E-6000, E-2000H, E-9000H, TCP, C-1100, etc.). Among these, in particular, it has an excellent offset resistance, adhesion resistance, paper permeability, glossiness, is resistant to cracking, and can provide an electrophotographic image-receiving sheet capable of forming a high-quality image. Is particularly preferably a montan wax having a temperature of 70 to 95 ° C.
[0071]
Examples of the petroleum wax include paraffin wax (paraffin wax 155, 150, 140, 135, 130, 125, 120, 115, HNP-3, HNP-5, HNP-9, HNP- 10, HNP-11, HNP-12, HNP-14G, SP-0160, SP-0145, SP-1040, SP-1035, SP-3040, SP-3035, NPS-8070, NPS-L-70, OX- 2151, OX-2251, EMUSTAR-0384, EMUSTAR-0136, Chukyo Oil & Fats Cellosol 686, 428, 651-A, A, H-803, B-460, E-172, 866, K-133, Hydrin D-337 E-139, 125 ° paraffin, 125 ° FD, 130 ° Fins, 135 ° paraffin, 135 ° H, 140 ° paraffin, 140 ° N, 145 ° paraffin, paraffin wax M, etc., microcrystalline wax (commercially available from Nihon Seiki Hi-Mic-2095, Hi-Mic-3090) , Hi-Mic-1080, Hi-Mic-1070, Hi-Mic-2065, Hi-Mic-1045, Hi-Mic-2045, EMUSTAR-0001, EMUSTAR-042X, Chukyo Oil & Fats Cellosol 967, M, Nisseki Mitsubishi Petroleum (manufactured by Nippon Seiki OX-1749, OX-0450, OX-0650B, OX-0153, OX-261BN, OX-0551, OX-0550, OX) -0750B, JP- 500, JP-056R, such as JP-011P), and the like.
[0072]
The content of the natural wax in the toner image-receiving layer (surface) is 0.1 to 4 g / m.²Is preferably 0.2 to 2 g / m²Is more preferable. The content is 0.1 g / m²If it is less than 4 g / m, offset resistance and adhesion resistance may be particularly insufficient.²If it exceeds 1, the amount of wax is too large, and the image quality of the formed image may be inferior.
[0073]
The melting point (° C.) of the natural wax is preferably 70 to 95 ° C., more preferably 75 to 90 ° C., particularly in terms of offset resistance and paper passing properties.
[0074]
Examples of the matting agent include various known ones. Solid particles used as the matting agent can be classified into inorganic particles and organic particles. Specific examples of the material for the inorganic matting agent include oxides (for example, silicon dioxide, titanium oxide, magnesium oxide, aluminum oxide), alkaline earth metal salts (for example, barium sulfate, calcium carbonate, magnesium sulfate), halogens Examples include silver halide (eg, silver chloride, silver bromide) and glass.
[0075]
Examples of the inorganic matting agent include West German Patent 2529321, British Patent 760775, 1260772, U.S. Patent 1201905, 2192241, 3030562, 3030649, 3257206, 3322555, and 3353958. No. 3,370,951, No. 3,411,907, No. 3,437,484, No. 3523022, No. 3,615,554, No. 3,635,714, No. 3769020, No. 40212245, and No. 4029504.
[0076]
The material of the organic matting agent includes starch, cellulose ester (for example, cellulose acetate propionate), cellulose ether (for example, ethyl cellulose) and synthetic resin. The synthetic resin is preferably water-insoluble or poorly water-soluble. Examples of the water-insoluble or poorly water-soluble synthetic resin include poly (meth) acrylic acid esters (for example, polyalkyl (meth) acrylate, polyalkoxyalkyl (meth) acrylate, polyglycidyl (meth) acrylate), poly (meth) acrylate. ) Acrylamide, polyvinyl ester (eg, polyvinyl acetate), polyacrylonitrile, polyolefin (eg, polyethylene), polystyrene, benzoguanamine resin, formaldehyde condensation polymer, epoxy resin, polyamide, polycarbonate, phenol resin, polyvinyl carbazole, polyvinylidene chloride, etc. Is mentioned.
You may use the copolymer which combined the monomer used for the above polymer.
[0077]
In the case of the copolymer, a small amount of hydrophilic repeating units may be contained.
Examples of the monomer that forms the hydrophilic repeating unit include acrylic acid, methacrylic acid, α, β-unsaturated dicarboxylic acid, hydroxyalkyl (meth) acrylate, sulfoalkyl (meth) acrylate, and styrene sulfonic acid.
Examples of the organic matting agent include British Patent No. 1055713, U.S. Pat. Nos. 1,939,213, 2221873, 2268661, 2322037, 2376005, 2391181, 2701245, 2992101, and 3079257. Nos. 3,262,782, 3,443,946, 3,516,832, 3,539,344, 3,591,379, 3,754,924, 3,767,448, JP-A-49-106821, JP-A-57-14835 Are described in the above.
Two or more kinds of solid particles may be used in combination. The average particle size of the solid particles is, for example, preferably 1 to 100 μm, and more preferably 4 to 30 μm. The amount of the solid particles used is 0.01 to 0.5 g / m.²Is preferred, 0.02-0.3 g / m²Is more preferable.
[0078]
As the release agent added to the toner image-receiving layer of the present invention, these derivatives, oxides, purified products, and mixtures can also be used. Moreover, these may have a reactive substituent.
[0079]
The melting point (° C.) of the release agent is preferably 70 to 95 ° C., and more preferably 75 to 90 ° C., particularly in terms of offset resistance and paper passing properties.
The release agent is particularly preferably a water-dispersed release agent from the viewpoint of compatibility when an aqueous thermoplastic resin is used as the thermoplastic resin of the toner image receiving layer.
[0080]
The content of the release agent in the toner image-receiving layer is preferably 0.1 to 10% by mass, more preferably 0.3 to 8.0% by mass, and still more preferably 0.5 to 5.0% by mass. .
[0081]
-Plasticizer-
As the plasticizer, known plasticizers for resins can be used without particular limitation. The plasticizer has a function of adjusting the flow or softening of the toner image-receiving layer by either heat or pressure when fixing the toner.
Examples of the plasticizer include "Chemical Handbook" (edited by the Chemical Society of Japan, Maruzen), "Plasticizer-Theory and Application-" (edited by Koichi Murai, Koshobo), "Research on plasticizer" "Study under" (edited by Polymer Chemistry Association) and "Handbook Rubber and Plastic Compounded Chemicals" (edited by Rubber Digest Co., Ltd.).
[0082]
Examples of the plasticizer include phthalic acid esters, phosphoric acid esters, fatty acid esters, abietic acid esters, adipic acid esters, sebacic acid esters, azelaic acid esters, benzoic acid esters, butyric acid esters. Epoxidized fatty acid esters, glycolic acid esters, propionic acid esters, trimellitic acid esters, citric acid esters, sulfonic acid esters, carboxylic acid esters, succinic acid esters, maleic acid esters, fumaric acid Esters, phthalic acid esters, stearic acid esters, etc .; amides (for example, fatty acid amides, sulfoamides, etc.), ethers, alcohols, lactones, polyethyleneoxys, etc. -83154, 59-178451 59-178453, 59-178454, 59-178455, 59-178457, 62-174754, 62-245253, 61-209444, 61-200538, 62 No.-8145, No. 62-9348, No. 62-30247, No. 62-136646, No. 62-174754, No. 62-245253, No. 61-209444, No. 61-200538, No. 62-8145 Nos. 62-9348, 62-30247, 62-136646, JP-A-2-235694, etc.). In addition, the said plasticizer can be mixed and used for resin.
[0083]
A relatively low molecular weight polymer can be used as the plasticizer. In this case, the molecular weight of the plasticizer is preferably lower than the molecular weight of the binder resin to be plasticized. The molecular weight is preferably 15000 or less, and more preferably 5000 or less. In the case of a polymer plasticizer, the polymer is preferably the same type as the binder resin to be plasticized. For example, a low molecular weight polyester is preferable for plasticizing a polyester resin. Furthermore, oligomers can also be used as plasticizers. In addition to the above compounds, commercially available products include, for example, Adeka Sizer PN-170, PN-1430 manufactured by Asahi Denka Kogyo; P. HALL products PARAPLEX-G-25, G-30, G-40; Rika Hercules products Ester gum 8L-JA, Ester R-95, Pentaline 4851, FK115, 4820, 830, Louisol 28-JA, Picolastic A75, Pico Tex LC, Crystallex 3085, etc. are mentioned.
[0084]
The plasticizer relieves stress and strain (physical strain such as elastic force and viscosity, strain due to mass balance of molecules, binder main chain, pendant, etc.) generated when toner particles are embedded in the toner image receiving layer. Can be used arbitrarily to
The plasticizer may be in a micro-dispersed state in the toner image-receiving layer, may be in a phase-separated microscopically in a sea-island shape, or may be in a sufficiently mixed and dissolved state with other components such as a binder.
The content of the plasticizer in the toner image-receiving layer is preferably 0.001 to 90% by mass, more preferably 0.1 to 60% by mass, and still more preferably 1 to 40% by mass.
The plasticizer adjusts smoothness (improves transportability due to reduced frictional force), improves fixing unit offset (detachment of toner and layers from the fixing unit), adjusts curl balance, and adjusts charging (toner electrostatic image It may be used for the purpose of forming).
[0085]
-Filler-
As said filler, an organic or inorganic filler is mentioned, A well-known thing can be used as a reinforcing agent for binder resin, a filler, and a reinforcing material. The filler should be selected with reference to "Handbook Rubber / Plastic Compounding Chemicals" (edited by Rubber Digest Co., Ltd.), "New Edition Plastic Compounding Agent Fundamentals and Applications" (Taiseisha), "Filler Handbook" (Taiseisha), etc. Can do.
As the filler, an inorganic filler (or inorganic pigment) can be suitably used. Examples of the inorganic filler (inorganic pigment) include silica, alumina, titanium dioxide, zinc oxide, zirconium oxide, mica-like iron oxide, white lead, lead oxide, cobalt oxide, strontium chromate, molybdenum-based pigment, smectite, magnesium oxide. , Calcium oxide, calcium carbonate, mullite, and the like. Among these, silica and alumina are preferable. These may be used alone or in combination of two or more. Moreover, as said filler, a thing with a small particle size is preferable. If the particle size is large, the surface of the toner image-receiving layer tends to be roughened.
[0086]
The silica includes spherical silica and amorphous silica. The silica can be synthesized by a dry method, a wet method, or an airgel method. The surface of the hydrophobic silica particles may be surface-treated with a trimethylsilyl group or silicone. As silica, colloidal silica is preferable. The average particle size of the silica is preferably 4 to 120 nm, and more preferably 4 to 90 nm.
The silica is preferably porous. The average pore diameter of the porous silica is preferably 50 to 500 nm. Moreover, the average pore volume per mass of the porous silica is preferably, for example, 0.5 to 3 ml / g.
[0087]
The alumina includes anhydrous alumina and alumina hydrate. As the crystal form of anhydrous alumina, α, β, γ, δ, ζ, η, θ, κ, ρ, or χ can be used. Alumina hydrate is preferred over anhydrous alumina. As the alumina hydrate, a monohydrate or a trihydrate can be used. Monohydrates include pseudoboehmite, boehmite and diaspore. Trihydrates include dibsite and bayerite. As an average particle diameter of an alumina, 4-300 nm is preferable and 4-200 nm is more preferable. Alumina is preferably porous. The average pore diameter of the porous alumina is preferably 50 to 500 nm. The average pore volume per mass of the porous alumina is preferably 0.3 to 3 ml / g.
[0088]
The alumina hydrate can be synthesized by a sol-gel method in which ammonia is added to an aluminum salt solution to precipitate, or a method in which an alkali aluminate is hydrolyzed. Anhydrous alumina can be obtained by dehydrating alumina hydrate by heating. The filler is preferably 5 to 2000 parts by mass with respect to 100 parts by mass of the dry mass of the binder of the toner image receiving layer.
[0089]
-Crosslinking agent-
The cross-linking agent can be added to adjust the storage stability, thermoplasticity, etc. of the toner image-receiving layer. As the crosslinking agent, a compound having two or more epoxy groups, isocyanate groups, aldehyde groups, active halogen groups, active methylene groups, acetylene groups and other known reactive groups in the molecule as reactive groups is used.
[0090]
As the crosslinking agent, a compound having two or more groups capable of forming a bond by a hydrogen bond, an ionic bond, a coordination bond, or the like can also be used.
Examples of the crosslinking agent include resin coupling agents, curing agents, polymerization agents, polymerization accelerators, coagulants, film-forming agents, film-forming aids, and the like. Examples of the coupling agent include chlorosilanes, vinyl silanes, epoxy silanes, aminosilanes, alkoxyaluminum chelates, titanate coupling agents, etc., and “Handbook Rubber / Plastic Compounding Chemicals” (edited by Rubber Digest Co., Ltd.). ) Etc. can be used.
[0091]
-Charge control agent-
The toner image-receiving layer preferably contains a charge control agent in order to adjust toner transfer, adhesion, etc., and to prevent charge adhesion of the toner image-receiving layer. As the charge control agent, conventionally known various charge control agents can be used. Examples of the charge control agent include surfactants such as cationic surfactants, anionic surfactants, amphoteric surfactants, and nonionic surfactants, polymer electrolytes, conductive metal oxides, and the like. Can be used. For example, quaternary ammonium salts, polyamine derivatives, cation-modified polymethyl methacrylate, cationic antistatic agents such as cation-modified polystyrene, anionic antistatic agents such as alkyl phosphates and anionic polymers, fatty acid esters, polyethylene oxide, etc. Nonionic antistatic agents may be mentioned, but are not limited thereto.
[0092]
When the toner has a negative charge, for example, a cation or nonion is preferable as the charge control agent to be blended in the toner image receiving layer.
Examples of the conductive metal oxide include ZnO and TiO.₂, SnO₂, Al₂O₃, In₂O₃, SiO₂, MgO, BaO, MoO₃Etc. These conductive metal oxides may be used alone or in combination with these composite oxides. In addition, the metal oxide may further contain a different element, for example, Al, In, etc. with respect to ZnO, such as TiO.₂Nb, Ta, etc., SnO₂Can contain (doping) Sb, Nb, a halogen element, or the like.
[0093]
The material that can be used for the toner image-receiving layer may contain various additives for improving the stability of the output image and for improving the stability of the toner image-receiving layer itself. Examples of the additive include various known antioxidants, antioxidants, deterioration inhibitors, ozone deterioration inhibitors, ultraviolet absorbers, metal complexes, light stabilizers, preservatives, fungicides, and the like.
[0094]
Examples of the antioxidant include a chroman compound, a coumaran compound, a phenol compound (eg, hindered phenol), a hydroquinone derivative, a hindered amine derivative, and a spiroindane compound. The antioxidant is described in JP-A No. 61-159644.
[0095]
Examples of the antiaging agent include those described in “Handbook Rubber / Plastic Compounding Chemicals Revised 2nd Edition” (1993, Rubber Digest Co.) p76-121.
[0096]
Examples of the ultraviolet absorber include a benzotriazole compound (described in US Pat. No. 3,533,794), a 4-thiazolidone compound (described in US Pat. No. 3,352,681), a benzophenone compound (described in Japanese Patent Laid-Open No. Sho 46-2784), Examples thereof include ultraviolet absorbing polymers (described in JP-A-62-260152).
[0097]
Examples of the metal complex include U.S. Pat. Nos. 4,241,155, 4,425,018, and 4,254,195, JP-A-61-88256, JP-A-62-174741, JP-A-63-199248, and JP-A-1-75568. No. 1-74272.
[0098]
As described above, known photographic additives can be added to the material that can be used for the toner image-receiving layer. As the photographic additive, for example, Research Disclosure Magazine (hereinafter abbreviated as RD) No. 17643 (December 1978), No. 18716 (November 1979) and 307105 (November 1989), and the corresponding parts are summarized below.

[0099]
[Physical properties of toner image-receiving layer]
The toner image-receiving layer has a 180-degree peel strength at a fixing temperature with the fixing member of preferably 0.1 N / 25 mm or less, and more preferably 0.041 N / 25 mm or less.
Here, the 180-degree peel strength can be measured according to the method described in JIS K6887 using the surface material of the fixing member.
The toner image receiving layer preferably has high whiteness. The whiteness is preferably 85% or more as measured by the method defined in JISP8123. Further, it is preferable that the spectral reflectance is 85% or more in the wavelength region of 440 nm to 640 nm and the difference between the maximum spectral reflectance and the minimum spectral reflectance in the same wavelength region is within 5%. Furthermore, it is more preferable that the spectral reflectance is 85% or more in the wavelength region of 400 nm to 700 nm, and the difference between the maximum spectral reflectance and the minimum spectral reflectance in the same wavelength region is within 5%.
Further, as the whiteness, specifically, CIE 1976 (L^*a^*b^*) In color space, L^*The value is preferably 80 or more, more preferably 85 or more, and still more preferably 90 or more. Further, the white color is preferably as neutral as possible. As the white color, L^*a^*b^*In space, (a^*)²+ (B^*)²The value of is preferably 50 or less, more preferably 18 or less, and still more preferably 5 or less.
[0100]
The toner image receiving layer preferably has a high glossiness. As the glossiness, the 45 ° glossiness is preferably 60 or more, more preferably 75 or more, and still more preferably 90 or more in the entire region from white without toner to black having the maximum density.
However, the glossiness is preferably 110 or less. When the glossiness exceeds 110, it becomes like metallic luster, which is not preferable for image quality.
The glossiness can be measured based on JIS Z8741.
[0101]
The toner image receiving layer preferably has high flatness. As the smoothness, the arithmetic average roughness (Ra) is preferably 3 μm or less, more preferably 1 μm or less, and even more preferably 0.5 μm or less in the entire region from white without toner to black having the maximum density.
The arithmetic average roughness can be measured based on JIS B0601, JIS B0651, and JIS B0652.
[0102]
The toner image-receiving layer preferably has physical properties of one of the following items, more preferably a plurality of items, and most preferably all physical properties.
(1) Tm (melting temperature) of the toner image-receiving layer is preferably 30 ° C. or higher, and more preferably Tm + 20 ° C. or lower of the toner.
(2) The toner image receiving layer has a viscosity of 1 × 10⁵The temperature at which cp is reached is preferably 40 ° C. or higher, and more preferably lower than that of the toner.
(3) The storage elastic modulus (G ′) at the fixing temperature of the toner image receiving layer is 1 × 10²~ 1x10⁵Pa is preferred. Loss elastic modulus (G ″) is 1 × 10²~ 1x10⁵Pa is preferred.
(4) The loss tangent (G ″ / G ′), which is the ratio of the loss elastic modulus (G ″) at the fixing temperature of the toner image-receiving layer and the storage elastic modulus (G ′), is preferably from 0.01 to 10.
(5) The storage elastic modulus (G ′) at the fixing temperature of the toner image-receiving layer is preferably −50 to +2500 with respect to the storage elastic modulus (G ″) at the fixing temperature of the toner.
(6) The inclination angle of the molten toner on the toner image-receiving layer is preferably 50 degrees or less, and more preferably 40 degrees or less.
The toner image-receiving layer preferably satisfies the physical properties disclosed in Japanese Patent No. 2788358, Japanese Patent Application Laid-Open Nos. 7-248637, 8-305067, and 10-239889. .
[0103]
As the toner image-receiving layer, 1 × 10⁶~ 1x10¹⁵Ω / cm²It is preferable to have a surface electrical resistance in the range of (under conditions of 25 ° C. and 65% RH).
The surface resistance is 1 × 10⁶Ω / cm²If the ratio is less than 1, the amount of toner when the toner is transferred to the toner image-receiving layer is not sufficient, and the density of the resulting toner image tends to be low.¹⁵Ω / cm²Exceeding this may generate more charge than necessary during transfer, and the toner may not be transferred sufficiently, resulting in low image density and electrostatic charge during the handling of the electrophotographic image-receiving sheet, which may cause dust to adhere. . Misfeeds, double feeds, discharge marks, toner transfer missing, etc. may occur during copying.
[0104]
The surface electrical resistance of the surface opposite to the toner image-receiving layer with respect to the support is 5 × 10.⁸~ 3.2 × 10¹⁰Ω / cm²1 × 10 is preferred⁹~ 1x10¹⁰Ω / cm²Is more preferable.
Here, the surface electrical resistance is measured in accordance with JIS K6911. The sample is conditioned for 8 hours or more in an environment of temperature 20 ° C. and humidity 65%, and R8340 manufactured by Advantest Corporation is used in the same environment. In addition, the measurement can be performed after 1 minute has passed since energization under the condition of an applied voltage of 100V.
[0105]
-Other layers-
Examples of the other layers include a surface protective layer, a back layer, an intermediate layer, an adhesion improving layer, an undercoat layer, a cushion layer, a charge control (prevention) layer, a reflective layer, a tint adjusting layer, a storage stability improving layer, and an adhesive. Examples include a prevention layer, an anti-curl layer, and a smoothing layer. These layers may be composed of a single layer or may be composed of two or more layers.
[0106]
The surface protective layer is used for the purpose of protecting the surface of the electrophotographic image-receiving sheet, improving storage stability, improving handleability, imparting writing properties, improving instrument passage properties, imparting anti-offset properties, and the like. It can be provided on the surface of the image receiving layer. The surface protective layer may be a single layer or may be composed of two or more layers. In the surface protective layer, various thermoplastic resins, thermosetting resins, and the like can be used as a binder, and it is preferable to use the same type of resin as the toner image receiving layer. However, thermodynamic characteristics, electrostatic characteristics, and the like do not need to be the same as those of the toner image-receiving layer, and can be optimized.
[0107]
The surface protective layer may contain the various additives described above that can be used for the toner image-receiving layer. In particular, the surface protective layer may be blended with other additives such as a matting agent in addition to the release agent used in the present invention. In addition, as said mat agent, various well-known things are mentioned.
The outermost surface layer in the electrophotographic image-receiving sheet (for example, the surface protective layer when a surface protective layer is formed) preferably has good compatibility with the toner from the viewpoint of fixability. Specifically, the contact angle with the melted toner is preferably, for example, 0 to 40 degrees.
[0108]
In the electrophotographic image-receiving sheet, the back layer is provided on the opposite side of the toner image-receiving layer with respect to the support for the purpose of imparting backside output suitability, improving backside output image quality, improving curl balance, and improving device passability. It is preferred that
Although there is no restriction | limiting in particular as a color of the said back layer, When the said electrophotographic image receiving sheet is a double-sided output type image receiving paper which forms an image also in a back surface, it is preferable that a back layer is also white. The whiteness and the spectral reflectance are preferably 85% or more like the surface.
Further, the back layer may have the same structure as that of the toner image receiving layer for improving the duplex output suitability. Various additives described above can be used for the back layer. As such an additive, it is particularly suitable to blend a matting agent, a charge adjusting agent and the like. The back layer may have a single layer configuration or a stacked configuration of two or more layers.
Further, in order to prevent offset at the time of fixing, when a releasable oil is used for the fixing roller or the like, the back layer may be oil absorbing.
[0109]
The adhesion improving layer is preferably formed for the purpose of improving the adhesion between the support and the toner image receiving layer in the electrophotographic image receiving paper. The above-mentioned various additives can be blended in the adhesion improving layer, and it is particularly preferable to blend a crosslinking agent. The electrophotographic image-receiving sheet is preferably further provided with a cushion layer or the like between the adhesion improving layer and the toner image-receiving layer in order to improve toner acceptability.
[0110]
The intermediate layer is formed, for example, between the support and the adhesion improving layer, between the adhesion improving layer and the cushion layer, between the cushion layer and the toner image receiving layer, and between the toner image receiving layer and the storage stability improving layer. Can do. Of course, in the case of an electrophotographic image-receiving sheet comprising a support, a toner image-receiving layer, and an intermediate layer, the intermediate layer can be present, for example, between the support and the toner image-receiving layer.
[0111]
〔toner〕
The electrophotographic material is used with a toner receiving layer receiving toner in printing or copying.
The toner contains at least a binder resin and a colorant, and if necessary, a release agent and other components.
[0112]
-Toner binder resin-
Examples of the binder resin include styrenes such as styrene and parachlorostyrene; vinyl esters such as vinyl naphthalene, vinyl chloride, vinyl bromide, vinyl fluoride, vinyl acetate, vinyl propionate, vinyl benzoate, and vinyl butyrate; Methyl acrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, dodecyl acrylate, n-octyl acrylate, 2-chloroethyl acrylate, phenyl acrylate, methyl α-chloroacrylate, methyl methacrylate, methacryl Methylene aliphatic carboxylic acid esters such as ethyl acetate and butyl methacrylate; Vinyl nitriles such as acrylonitrile, methacrylonitrile, and acrylamide; Vinyl ethers such as vinyl methyl ether, vinyl ethyl ether, and vinyl isobutyl ether Tells; N-vinyl compounds such as N-vinyl pyrrole, N-vinyl carbazole, N-vinyl indole, N-vinyl pyrrolidone; single weight of vinyl monomers such as vinyl carboxylic acids such as methacrylic acid, acrylic acid and cinnamic acid Copolymers, copolymers thereof, and various polyesters can be used, and various waxes can be used in combination.
Among these resins, it is preferable to use a resin of the same system as that used for the toner image receiving layer.
[0113]
-Toner Colorant-
As the colorant, those usually used in toners can be used without limitation. For example, carbon black, chrome yellow, hansa yellow, benzidine yellow, sren yellow, quinoline yellow, permanent orange GTR, pyrazolone. Orange, Vulcan Orange, Watch Young Red, Permanent Red, Brilliantamine 3B, Brilliantamine 6B, Daypon Oil Red, Pyrazolone Red, Risor Red, Rhodamine B Lake, Lake Red C, Rose Bengal, Aniline Blue, Ultramarine Blue, Calco Examples include various pigments such as oil blue, methylene blue chloride, phthalocyanine blue, phthalocyanine green, and malachite green oxalelate. Acridine, xanthene, azo, benzoquinone, azine, anthraquinone, thioindico, dioxazine, thiazine, azomethine, indico, thioindico, phthalocyanine, aniline black, polymethine, triphenyl Examples include various dyes such as methane, diphenylmethane, thiazine, thiazole, and xanthene. These colorants may be used alone or in combination of two or more.
The content of the colorant is preferably in the range of 2 to 8% by mass. If the content of the colorant is 2% by mass or more, the coloring power is not weakened. On the other hand, if it is 8% by mass or less, the transparency is not impaired, which is preferable.
[0114]
-Toner release agent-
As the mold release agent, all known waxes can be used in principle, but polar waxes containing nitrogen such as relatively low molecular weight high crystalline polyethylene wax, Fischer-Tropsch wax, amide wax, urethane compound, etc. Etc. are particularly effective. The polyethylene wax preferably has a molecular weight of 1000 or less, and more preferably in the range of 300 to 1000.
[0115]
The compound having a urethane bond is suitable because even if it has a low molecular weight, the solid state can be maintained and the melting point can be set high for the molecular weight due to the strength of cohesive force due to the polar group. The preferred range of molecular weight is 300-1000. The raw materials are a combination of diisocyanate compounds and monoalcohols, a combination of monoisocyanic acid and monoalcohol, a combination of dialcohols and monoisocyanic acid, a combination of trialcohols and monoisocyanic acid, triisocyanic acid Various combinations such as combinations of compounds and monoalcohols can be selected, but in order not to increase the molecular weight, it is preferable to combine a compound of a polyfunctional group and a monofunctional group, and an equivalent functional group amount. It is important to ensure that
[0116]
Specific examples of the monoisocyanate compound among the raw material compounds include dodecyl isocyanate, phenyl isocyanate and derivatives thereof, naphthyl isocyanate, hexyl isocyanate, benzyl isocyanate, butyl isocyanate, and allyl isocyanate. It is done.
Examples of the diisocyanate compound include tolylene diisocyanate, 4,4′diphenylmethane diisocyanate, toluene diisocyanate, 1,3-phenylene diisocyanate, hexamethylene diisocyanate, 4-methyl-m-phenylene diisocyanate, and isophorone diisocyanate. Can be mentioned.
As the monoalcohol, it is possible to use very common alcohols such as methanol, ethanol, propanol, butanol, pentanol, hexanol, and heptanol.
Among the raw material compounds, as the dialcohols, a number of glycols such as ethylene glycol, diethylene glycol, triethylene glycol, trimethylene glycol; as the trialcohols, trimethylolpropane, triethylolpropane, trimethanolethane, etc. can be used. However, it is not necessarily limited to this range.
[0117]
These urethane compounds can be mixed with a resin and a colorant at the time of kneading and used as a kneaded and pulverized toner as in a normal release agent. Also, when used in the emulsion polymerization aggregation melting toner described above, it is dispersed in water together with a polymer electrolyte such as an ionic surfactant, a polymer acid or a polymer base, and heated to a melting point or higher to produce a homogenizer or pressure discharge. A fine dispersion is obtained by applying strong shearing with a mold disperser to prepare a release agent particle dispersion of 1 μm or less, which can be used together with a resin particle dispersion, a colorant dispersion and the like.
[0118]
-Toner and other components-
Further, the toner of the present invention may contain other components such as an internal additive, a charge control agent, and inorganic fine particles. As the internal additive, a magnetic material such as a metal such as ferrite, magnetite, reduced iron, cobalt, nickel, manganese, an alloy, or a compound containing these metals can be used.
[0119]
As the charge control agent, various commonly used charge control agents such as quaternary ammonium salt compounds, nigrosine compounds, dyes composed of complexes of aluminum, iron, chromium, and triphenylmethane pigments may be used. it can. A material that is difficult to dissolve in water is preferable from the viewpoint of controlling the ionic strength that affects the stability during aggregation and melting and reducing wastewater contamination.
[0120]
Examples of the inorganic fine particles include silica, alumina, titania, calcium carbonate, magnesium carbonate, and tricalcium phosphate. Usually, all external additives on the toner surface are used, and these are used as ionic surfactants or polymer acids. It is preferable to use it dispersed in a polymer base.
[0121]
Furthermore, a surfactant can be used for emulsion polymerization, seed polymerization, pigment dispersion, resin particle dispersion, mold release dispersion, aggregation, and stabilization thereof. For example, anionic surfactants such as sulfate ester, sulfonate, phosphate, and soap, cationic surfactants such as amine salt type and quaternary ammonium salt type, polyethylene glycol type, alkylphenol It is also effective to use a nonionic surfactant such as an ethylene oxide adduct system or a polyhydric alcohol system in combination. As a dispersing means at that time, a general means such as a rotary shear type homogenizer, a ball mill having a media, a sand mill, a dyno mill or the like can be used.
[0122]
An external additive may be further added to the toner as necessary. Examples of the external additive include inorganic powder and organic particles. Examples of the inorganic particles include SiO.₂TiO₂, Al₂O₃, CuO, ZnO, SnO₂, Fe₂O₃, MgO, BaO, CaO, K₂O, Na₂O, ZrO₂, CaO / SiO₂, K₂O. (TiO₂)_n, Al₂O₃・ 2SiO₂, CaCO₃, MgCO₃, BaSO₄, MgSO₄Etc. can be illustrated. Moreover, as said organic particle, resin powder, such as fatty acid or its derivative (s), powders, such as these metal salts, a fluorine resin, a polyethylene resin, an acrylic resin, can be used. For example, the average particle size of these powders is preferably 0.01 to 5 μm, and more preferably 0.1 to 2 μm.
[0123]
The method for producing the toner is not particularly limited, and (i) a step of forming aggregated particles in a dispersion obtained by dispersing resin particles to prepare an aggregated particle dispersion, (ii) in the aggregated particle dispersion. A step of adding and mixing a fine particle dispersion in which fine particles are dispersed to adhere the fine particles to the aggregated particles to form adhered particles; and (iii) heating and fusing the adhered particles to form toner particles. Those obtained by a method for producing a toner including the steps are preferable.
[0124]
-Toner physical properties-
The volume average particle size of the toner of the present invention is preferably from 0.5 μm to 10 μm.
If the volume average particle size of the toner is too small, there may be an adverse effect on toner handling (replenishability, cleaning properties, fluidity, etc.), and particle productivity may be reduced. On the other hand, if the volume average particle size of the toner is too large, the image quality and resolution due to graininess and transferability may be adversely affected.
Further, the toner of the present invention preferably satisfies the volume average particle size range of the toner, and the volume average particle size distribution index (GSDv) is preferably 1.3 or less.
The ratio (GSDv / GSDn) of the volume average particle size distribution index (GSDv) to the number average particle size distribution index (GSDn) is preferably 0.95 or more.
In addition, the toner of the present invention satisfies the volume average particle diameter range of the toner, and the average value of the shape factor represented by the following formula is preferably 1.00 to 1.50.
Shape factor = (π × L²) / (4 × S)
In the above formula, L represents the maximum length of toner particles. S represents the projected area of the toner particles.
When the toner satisfies the above conditions, it is effective for image quality, particularly graininess, and resolution, and it is difficult for transfer and omission to occur, and handling properties are not adversely affected even if the average particle size is not small. Become.
[0125]
The storage elastic modulus G ′ (measured at an angular frequency of 10 rad / sec) at 150 ° C. of the toner itself is suitably 10 to 200 Pa from the viewpoint of improving the image quality and preventing the offset property in the fixing process.
[0126]
<Silver salt photographic material>
As the silver salt photographic material, for example, a silver halide photographic sheet having a structure in which an image recording layer that develops color at least on YMC is provided on the support for image recording material of the present invention, and is subjected to printing exposure. Examples of the silver halide photographic system include color development, bleach-fixing, washing with water, and drying by passing through a plurality of processing tanks while immersing.
[0127]
<Inkjet recording material>
Examples of the ink jet recording material include a liquid ink such as a water-based ink (using a dye or a pigment as a color material) and an oil-based ink on the support for an image recording material of the present invention, and a solid at room temperature. The colorant receiving layer is capable of receiving solid ink or the like that is melted and liquefied and used for printing.
[0128]
<Thermal transfer material>
The thermal transfer material has, for example, a configuration in which at least a heat-meltable ink layer as an image recording layer is provided on the image-recording material support of the present invention, and is heated by a thermal head to heat-melt ink. Examples include a method in which ink is melt-transferred from a layer onto a thermal transfer sheet.
[0129]
<Thermal material>
The thermosensitive material is, for example, a thermoauto having a configuration in which at least a thermochromic layer is provided on the image recording material support of the present invention, and forming an image by repeating heating with a thermal head and fixing with ultraviolet rays. Examples thereof include heat-sensitive materials used in the chrome method (TA method).
[0130]
<Sublimation transfer material>
The sublimation transfer material has, for example, a structure in which an ink layer containing at least a heat diffusible dye (sublimation dye) is provided on the support for image recording material of the present invention, and is heated by a thermal head. And a sublimation transfer method in which a heat-diffusible dye is transferred from an ink layer onto a sublimation transfer sheet.
[0131]
<Printing paper>
The image recording material support is also preferably used as printing paper. When used as printing paper, a material having high mechanical strength is preferable from the viewpoint of applying ink or the like by a printing machine.
[0132]
When a base paper is used as the base paper, it is preferable that the paper contains a filler, a softener, an internal additive for papermaking, and the like. As fillers, commonly used ones can be used, such as clay, calcined clay, diatomaceous earth, talc, kaolin, calcined kaolin, deramikaolin, heavy calcium carbonate, light calcium carbonate, magnesium carbonate, barium carbonate, titanium dioxide. Inorganic fillers such as zinc oxide, silicon oxide, amorphous silica, aluminum hydroxide, calcium hydroxide, magnesium hydroxide, zinc hydroxide, organic fillers such as urea-formalin resin, polystyrene resin, phenol resin, and fine hollow particles , Etc. These may be used alone or in combination of two or more.
[0133]
Examples of the internal additive for papermaking include various conventionally used nonionic, cationic, and anionic yield improvers, freeness improvers, paper strength improvers, and internally added sizing agents. Can be mentioned. Specifically, basic aluminum compounds such as sulfate band, aluminum chloride, sodium aluminate, basic aluminum chloride, basic polyaluminum hydroxide; polyvalent metal compounds such as ferrous sulfate and ferric sulfate, starch , Modified starch, polyacrylamide, urea resin, melamine resin, epoxy resin, polyamide resin, polyamine resin, polyamine, polyethyleneimine, vegetable gum, polyvinyl alcohol, latex, polyethylene oxide and other water-soluble polymers, hydrophilic cross-linked polymer particle dispersion And various compounds such as derivatives and modified products thereof, and these substances simultaneously have some of the functions as an internal additive for papermaking.
[0134]
Next, as the functions of the internal sizing agent, the alkyl ketene dimer compound, alkenyl succinic anhydride compound, styrene-acrylic compound, higher fatty acid compound, petroleum resin sizing agent and rosin sizing agent are used. Is mentioned.
[0135]
Furthermore, internal additives for papermaking such as dyes, fluorescent brighteners, pH adjusters, antifoaming agents, pitch control agents, slime control agents and the like may be appropriately added depending on the intended use.
[0136]
The printing paper is particularly suitable as offset printing paper, and can be used as letterpress printing paper, gravure printing paper, and electrophotographic paper.
[0137]
The image recording material of the present invention has a high image quality and high gloss on the image-formed surface after image formation, and further less curling, electrophotographic materials, heat-sensitive materials, inkjet recording materials, sublimation transfer. Suitable for materials, silver salt photographic materials, thermal transfer materials and the like.
[0138]
【Example】
Examples of the present invention will be described below, but the present invention is not limited to these examples.
In the following examples and comparative examples, “%” and “part” represent “% by mass” and “part by mass”, respectively.
[0139]
(Example 1)
-Preparation of support for image recording material-
Hardwood bleached kraft pulp (LBKP) was beaten to 280 ml (Canadian standard freeness, CSF) with a disc refiner to produce a pulp stock with a fiber length of 0.60 mm.
Based on the pulp mass, the pulp stock is 1.6% by mass cationic starch, 0.4% by mass alkyl ketene dimer (AKD), 0.3% by mass anionic polyacrylamide, 0.2% epoxidized fatty acid amide (EFA). It added so that it might become a ratio of 0.2 mass% of mass% and polyamide polyamine epichlorohydrin. The alkyl portion of the alkyl ketene dimer is derived from a fatty acid mainly composed of behenic acid. The fatty acid portion of the epoxidized fatty acid amide is derived from a fatty acid mainly composed of behenic acid.
[0140]
Using the handmade sheet machine for the obtained pulp paper stock, an absolutely dry basis weight of 140 g / m²A wet paper with a moisture content of 68% was prepared.
Both sides of the obtained wet paper were sandwiched with filter paper, dehydrated with a wet press device, and the water content was adjusted to 47%.
The wet paper after dehydration was dried using the press-drying apparatus (manufactured by VALMET, Static Condebelt) shown in FIG. 1 as the press-drying treatment, to prepare a base paper having a moisture content of 7.0% after drying. In the press-drying process, the temperature of the upper plate in contact with the surface side (front surface) on which the image recording layer of the base paper is provided is adjusted to 150 ° C., and the temperature of the lower plate in contact with the surface side (back surface) on which the image recording layer of the base paper is not provided. Was adjusted to 85 ° C. under conditions of a press pressure of 0.4 MPa and a drying time of 1 second.
[0141]
Thereafter, the base paper subjected to the press-drying treatment is set to 40 ° C. using a soft calender device on the surface side (surface) on which the image recording layer is provided and the surface temperature of the metal roll having a surface temperature of 250 ° C. and the resin roll on the opposite side. The calendar process was performed. The density of the obtained paper as the image recording material support was 0.96 g / cm.³Met.
[0142]
(Examples 2 to 4 and Comparative Examples 1 to 6)
In Example 1, except that the conditions shown in Table 1 were changed, paper as the image recording material support of Examples 2 to 4 and Comparative Examples 1 to 6 was produced in the same manner as Example 1.
[0143]
[Table 1]

[0144]
Next, for each of the obtained papers of Examples 1 to 4 and Comparative Examples 1 to 6 (support for image recording material), the internal bond strength and the flatness were evaluated as follows. The results are shown in Table 2.
[0145]
<Evaluation of internal bond strength>
JAPAN TAPPI No. The internal bond strength was measured according to No.54.
<Evaluation of flatness>
Using a surface shape measuring device Surfcom 570A-3DF (manufactured by Tokyo Seimitsu Co., Ltd.), based on the following measurement and analysis conditions, image recording of the support for an image recording material under a cut-off 0.3 mm to 0.4 mm condition The center surface average roughness (SRa) on the side where the layer was provided was measured.
-Measurement and analysis conditions-
・ Scanning direction: MD direction of sample
・ Measurement length: 50 mm in papermaking (X) direction, 30 mm in its vertical (Y) direction
・ Measurement pitch: 0.1 mm in the X direction, 0.1 mm in the Y direction
・ Scanning speed: 30mm / sec
・ Band pass filter: 0.3-0.4mm
〔Evaluation criteria〕
A: very good (SRa is 0.8 μm or less)
B: Excellent (SRa is 0.8 μm or more and less than 0.95 μm)
C: Intermediate (SRa is 0.96 μm or more and less than 1.1 μm)
D: Inferior (SRa is 1.1 μm or more)
[0146]
[Table 2]

[0147]
(Examples 5-8 and Comparative Examples 7-12)
Using the papers of Examples 1 to 4 and Comparative Examples 1 to 6 (supports for image recording materials), the electrophotographic image receiving papers of Examples 5 to 8 and Comparative Examples 7 to 12 were produced by the following method.
[0148]
-Titanium dioxide dispersion-
40.0 g of titanium dioxide (Typaque (registered trademark) A-220, manufactured by Ishihara Sangyo), 2.0 g of PVA102 (manufactured by Kuraray Co., Ltd.), and 58.0 g of ion-exchanged water are mixed, and NBK-2 manufactured by Nippon Seiki Seisakusho is used. A titanium dioxide dispersion (with a titanium dioxide pigment content of 40% by mass) was prepared by dispersing the mixture.
[0149]
-Preparation of coating solution for toner image-receiving layer-
15.5 g of the above titanium dioxide dispersion, 15.0 g of carnauba wax dispersion (Cerosol 524, manufactured by Chukyo Yushi Co., Ltd.), 100.0 g of polyester resin aqueous dispersion (solid content 30% by mass, KZA-7049, manufactured by Unitika) Then, 2.0 g of a thickener (Alcox E30, manufactured by Meisei Chemical Co., Ltd.), 0.5 g of an anionic surfactant (AOT), and 80 ml of ion-exchanged water were mixed and stirred to prepare a toner image-receiving layer coating solution.
The resulting toner image-receiving layer coating solution had a viscosity of 40 mPa · s and a surface tension of 34 mN / m.
[0150]
-Preparation of coating solution for back layer-
The following components were mixed and stirred to prepare a back layer coating solution.
Acrylic resin water dispersion (solid content 30% by mass, Hiloss XBH-997L, manufactured by Seiko Chemical Co., Ltd.) 100.0 g, matting agent (Tepomer MBX-12, manufactured by Sekisui Plastics Co., Ltd.) 5.0 g, release agent ( Hydrin D337, manufactured by Chukyo Yushi Co., Ltd.) 10.0 g, thickener (CMC) 2.0 g, anionic surfactant (AOT) 0.5 g, and ion-exchanged water 80 ml are mixed and stirred for the back layer. A coating solution was prepared.
The viscosity of the obtained coating liquid for back layer was 35 mPa · s, and the surface tension was 33 mN / m.
[0151]
-Coating of back layer and toner image-receiving layer-
On the back surface (surface on which the toner image-receiving layer is not provided) of each of the image recording material supports of Examples 1 to 4 and Comparative Examples 1 to 6, the back layer coating solution was dried by a bar coater with a dry mass of 9 g / m²It applied so that it might become, and the back layer was formed. Further, the toner image-receiving layer coating solution is applied to the surface of each image recording material support with a bar coater and the dry mass is 12 g / m.²Was applied to form a toner image-receiving layer. The pigment content in the toner image-receiving layer was 5% by mass relative to the thermoplastic resin.
[0152]
The back layer and the toner image receiving layer were coated and then dried online with hot air. In the drying, the drying air volume and temperature were adjusted so that both the back layer and the toner image-receiving layer were dried within 2 minutes after coating. The drying point was the point at which the coating surface temperature was the same as the wet bulb temperature of the drying air.
Next, after drying, a calendar process was performed. The calendering was performed under the condition of a nip pressure of 14.7 kN / m (15 kgf / cm) using a gloss calender and keeping the metal roller at 40 ° C.
[0153]
Each obtained electrophotographic image-receiving paper was cut into A4, and an image was printed using an electrophotographic printer. As the printer used, a color laser printer (DocuColor 1250-PF) manufactured by Fuji Xerox Co., Ltd., having the fixing unit shown in FIG. 3 as the belt fixing device 1 was used.
That is, in the belt fixing device 1 shown in FIG. 3, the fixing belt 2 is suspended over the heating roller 3 and the tension roller 5, and the cleaning roller 6 is disposed above the tension roller 5 via the fixing belt 2. Further, a pressure roller 4 is provided below the heating roller 3 via the fixing belt 2. The electrophotographic image-receiving paper having the latent toner image is inserted between the heating roller 3 and the pressure roller 4 from the right side in FIG. 3 and fixed, and then moved on the fixing belt 2. In the process, it is cooled by the cooling device 7 and finally cleaned by the cleaning roller 6.
In the belt fixing device 1, the conveyance speed of the fixing belt 2 is 30 mm / second, and the nip pressure between the heating roller 3 and the pressure roller 4 is 0.2 MPa (2 kgf / cm 2).²The set temperature of the heating roller 3 is 150 ° C., which corresponds to the fixing temperature. The set temperature of the pressure roller 4 was set to 120 ° C.
[0154]
The obtained electrophotographic prints were evaluated for image quality, glossiness and curl properties as follows. The results are shown in Table 3.
[0155]
<Image quality>
The image quality of each electrophotographic print was visually observed, and the best image quality was ranked as A and then evaluated as B, C, D, E based on the following criteria.
〔Evaluation criteria〕
A ... Excellent (effective as a high-quality recording material)
B ... Excellent (effective as a high-quality recording material)
C ・ ・ ・ Intermediate (not possible as a high-quality recording material)
D: Inferior (not possible as high-quality recording material)
E ... Very inferior (impossible as high quality recording material)
[0156]
<Glossiness>
The glossiness of each electrophotographic print was visually observed, and the best glossiness was ranked as A and then evaluated as B, C, D, E based on the following criteria.
〔Evaluation criteria〕
A ... Excellent (effective as a high-quality recording material)
B ... Excellent (effective as a high-quality recording material)
C ・ ・ ・ Intermediate (not possible as a high-quality recording material)
D: Inferior (not possible as high-quality recording material)
E ... Very inferior (impossible as high quality recording material)
[0157]
<Curl properties>
The curls of each electrophotographic print were visually observed, and the one with the least curl was ranked as A and then evaluated as B, C, D, E based on the following criteria.
〔Evaluation criteria〕
A: No curling (effective as a high-quality recording material)
B: Slightly curled, but no problem (effective as a high-quality recording material)
C: Curling is recognized (not possible as a high-quality recording material)
D: Large curl is recognized (not possible as high-quality recording material)
E: Very large curl is recognized (not possible as a high-quality recording material)
[0158]
[Table 3]

[0159]
(Examples 9-12 and Comparative Examples 13-18)
-Photographic paper-
0.1 g / m of gelatin was formed on the surface (surface) on which the image recording layer of each of the supports for image recording materials prepared in Examples 1 to 4 and Comparative Examples 1 to 6 was provided.²The silver halide gelatin emulsion layer (10 g / m2) was coated on the gelatin coated surface.²), Gelatin intermediate layer, magenta colored silver halide gelatin emulsion layer for color photography (10 g / m)²), Gelatin intermediate layer, cyan halide color emulsion silver halide emulsion layer (10 g / m)²), A gelatin protective layer was applied in this order to produce photographic photographic papers of Examples 9-12 and Comparative Examples 13-18.
[0160]
Each obtained photographic printing paper was exposed and developed to obtain a photographic print. The surface flatness (small unevenness (1 mm or less)) and the surface flatness (waviness unevenness (5-6 mm)) of the screen of each photographic print were evaluated by the following methods. The results are shown in Table 4.
[0161]
<Surface flatness (micro unevenness (1 mm or less)>
Each photographic print was visually observed, and based on the following criteria, the most excellent surface flatness (small unevenness (1 mm or less)) was ranked as A, then B, C, D, E and evaluated. .
〔Evaluation criteria〕
A ... Excellent (effective as a high-quality recording material)
B ... Excellent (effective as a high-quality recording material)
C ・ ・ ・ Intermediate (not possible as a high-quality recording material)
D: Inferior (not possible as high-quality recording material)
E ... Very inferior (impossible as high quality recording material)
[0162]
<Surface flatness (undulation unevenness (5 to 6 mm)>
Each photographic print is visually observed, and based on the following criteria, the best surface flatness (waviness unevenness (5-6 mm)) is ranked as A, then B, C, D, E and evaluated. did.
〔Evaluation criteria〕
A ... Excellent (effective as a high-quality recording material)
B ... Excellent (effective as a high-quality recording material)
C ・ ・ ・ Intermediate (not possible as a high-quality recording material)
D: Inferior (not possible as high-quality recording material)
E ... Very inferior (impossible as high quality recording material)
[0163]
[Table 4]

[0164]
【The invention's effect】
According to the present invention, a paper and image recording material support having high flatness, and an image recording having a high image quality, high glossiness, and less curling after image formation. Material can be provided.
[Brief description of the drawings]
FIG. 1 is a schematic view showing an example of a press dry processing apparatus of the present invention.
FIG. 2 is a schematic view showing an example of a press drying apparatus when the press dry processing of the present invention is performed as a production line.
FIG. 3 is a schematic configuration diagram of a belt fixing device in the printer used in the embodiment.
[Explanation of symbols]
1 Belt fixing device
2 Fixing belt
3 Heating roller
4 Pressure roller
5 Tension roller
6 Cleaning roller
7 Cooling device
38 Endless belt
39 Endless belt
40 Pulp paper stock
41 Woven fabric
42 Upper plate
43 Lower plate
44 jacket
45 Hydraulic oil
46 Cooling water
47 Oil for heating
48 Pressurizer
49 Vacuum tank
51 First rotating roller
52 First rotating roller
53 Second Rotating Roller
54 Second rotating roller
55 Heat chamber
56 Cooling room
100 Press drying equipment
200 Press-drying equipment

Claims (12)

In the paper including at least the base paper, the JAPAN TAPPI No. 54, the internal bond strength is 160 mJ or more, and the center plane average roughness (SRa) under the condition of a cut-off of 0.3 to 0.4 mm on at least one surface of the paper is 0. A paper characterized by being 9 μm or less. The paper according to claim 1, wherein the internal bond strength is 200 mJ or more. The paper according to claim 1, wherein the internal bond strength is 216 mJ or more. The paper according to any one of claims 1 to 3, wherein the base paper contains hardwood pulp. The paper according to claim 4, wherein the content of hardwood pulp relative to the paper is 50% by mass or more. The paper according to any one of claims 1 to 5, which has been press-dried. The paper according to any one of claims 1 to 6, wherein the paper is press-dried and calendered. The paper according to any one of claims 6 to 7, wherein a center plane average roughness (SRa) under a condition of a cut-off of 0.3 to 0.4 mm on a press-dried surface is 0.9 µm or less. Density, paper according to any of claims 1 to 8 is 0.85~1.05g / cm ^3. A support for an image recording material comprising the paper according to any one of claims 1 to 9. An image recording material having at least an image recording layer on a support, wherein the image recording material support according to claim 10 is used as the support. The image recording material according to claim 11, which is selected from an electrophotographic material, a heat sensitive material, an ink jet recording material, a sublimation transfer material, a silver salt photographic material, and a thermal transfer material.

Images