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JP2005074880A - Inkjet recording sheet - Google Patents

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JP2005074880A
JP2005074880A JP2003309909A JP2003309909A JP2005074880A JP 2005074880 A JP2005074880 A JP 2005074880A JP 2003309909 A JP2003309909 A JP 2003309909A JP 2003309909 A JP2003309909 A JP 2003309909A JP 2005074880 A JP2005074880 A JP 2005074880A
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water
recording sheet
ink
acrylic
image
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JP4127531B2 (en
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Masayoshi Iwasaki
匡誉 岩崎
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Union Chemical Co Ltd
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Union Chemical Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an inkjet recording sheet which is in particular excellent in absorption, drying property and coloring property to an aqueous pigment ink and good in water resistance, in the inkjet recording sheet having transparency and glossiness. <P>SOLUTION: In the recording sheet for ink jetting which forms an image by using the aqueous pigment ink, an image receiving layer of the recording sheet comprises two kinds of a water urethane resin and a water-soluble acrylic resin and contains, as a cross linking agent, a water soluble polymer having an oxazoline group and acrylic water soluble self emulsified epoxy curing agent to be featured. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明はインクジェット用記録シートに関するものであり、特に、透明もしくは光沢を有しているインクジェット記録用シート関する。 The present invention relates to an ink jet recording sheet, and more particularly to an ink jet recording sheet having transparency or gloss.

従来の技術では、特に透明もしくは光沢を有しているインクジェット記録用シートの受像層は、ポリビニルアルコール、ポリビニルピロリドン、澱粉、水溶性セルロース誘導体が提案されている。しかし、この方法では特に水性顔料インクの吸収性、乾燥性が悪く、乾燥途中で受像層がひび割れる問題がある。更に耐水性も不十分なため、水滴や汗が受像層に付着した場合、記録画像が滲んだり、受像層が基材から剥がれ易いという問題があり、いまだ満足できる結果を得るに至っていない。そこで、耐水性を向上させる方法として、数々の架橋剤を用いることが検討されており、このような架橋剤として、例えば、イソシアネート類、アジリジン類、ホウ酸類等が挙げられる。しかし、このような架橋剤では充分な耐水性を得ることができず、透明度や光沢度が低下する問題がある。特開2000-52647、特開2001-219645には、オキサゾリン基を有する水溶性ポリマーを含有する、インクジェット用記録シート用コーティング剤が開示されている。しかしながら、オキサゾリン基1種類のみの添加では、塗工液固形分中のオキサゾリン基含有水溶性ポリマーの固形分が45%〜50%でありながら、耐水性がいまだ不十分であり、また、充分な耐水性を得られたとしても、記録画像が滲んだり、インクの定着性の低下を引き起こすという欠点がある。また、オキサゾリン基含有水溶性ポリマー多く添加することでコスト的に不利である。従来のインクジェット用記録シートは、耐水性の向上と共に、インク吸収性、乾燥性が低下し、印刷画質の低下が問題であった。このため、インク吸収性と印刷物の耐水性とを備え持つインクジェット用記録シートは得られていない。
特開2000−52647号公報 特開2001−219645号公報
In the prior art, polyvinyl alcohol, polyvinyl pyrrolidone, starch, and a water-soluble cellulose derivative have been proposed for the image-receiving layer of an inkjet recording sheet that is particularly transparent or glossy. However, this method has a problem that the water-based pigment ink has particularly poor absorbability and drying properties, and the image receiving layer is cracked during drying. Further, since the water resistance is also insufficient, there is a problem that when a water droplet or sweat adheres to the image receiving layer, there is a problem that the recorded image is blurred or the image receiving layer is easily peeled off from the substrate, and satisfactory results have not yet been obtained. Then, as a method for improving water resistance, the use of various crosslinking agents has been studied, and examples of such crosslinking agents include isocyanates, aziridines, boric acids and the like. However, such a crosslinking agent has a problem that sufficient water resistance cannot be obtained and transparency and glossiness are lowered. JP-A-2000-52647 and JP-A-2001-219645 disclose a coating agent for an ink jet recording sheet containing a water-soluble polymer having an oxazoline group. However, when only one type of oxazoline group is added, the water content is still insufficient while the solid content of the oxazoline group-containing water-soluble polymer in the solid content of the coating solution is 45% to 50%, and sufficient Even if the water resistance is obtained, there is a drawback that the recorded image is blurred or the fixing property of the ink is lowered. Moreover, it is disadvantageous in cost to add a large amount of water-soluble polymer containing oxazoline group. Conventional ink jet recording sheets have problems in that the water resistance is improved, the ink absorbability and the drying property are lowered, and the printing image quality is lowered. For this reason, an ink jet recording sheet having ink absorbability and water resistance of printed matter has not been obtained.
JP 2000-52647 A JP 2001-219645 A

本発明の目的は、透明もしくは光沢を有しているインクジェット用記録シートにおいて、特に水性顔料インクの吸収性、乾燥性、発色性に優れ、且つ、耐水性が良好なインクジェット用記録シートを提供することにある。 An object of the present invention is to provide an inkjet recording sheet that is transparent or glossy, particularly excellent in water-absorbent pigment ink absorbability, drying properties, and color developability, and has good water resistance. There is.

目的を達成するため、本発明は、水性ウレタン樹脂、水性アクリル樹脂の2種からなり、架橋剤としてオキサゾリン基を有する水溶性ポリマー及びアクリル系の水溶性自己乳化型エポキシ硬化剤を含有することを特徴とするものである。 In order to achieve the object, the present invention comprises two types of aqueous urethane resin and aqueous acrylic resin, and contains a water-soluble polymer having an oxazoline group and an acrylic water-soluble self-emulsifying epoxy curing agent as a crosslinking agent. It is a feature.

本発明は透明もしくは光沢を有しているインクジェット用記録シートにおいて、特に水性顔料インクの吸収性、乾燥性、発色性に優れ、且つ、耐水性が良好なインクジェット用記録シートを提供することができる。 INDUSTRIAL APPLICABILITY The present invention can provide an ink jet recording sheet that is transparent or glossy, and that is particularly excellent in water pigment ink absorbability, drying properties, and color developability, and has good water resistance. .

本発明者は鋭意検討の結果、水性顔料インクを用いて画像を形成するインクジェット用記録シートにおいて、該記録シートの受像層が、水性ウレタン樹脂、水性アクリル樹脂の2種からなり、架橋剤としてオキサゾリン基を有する水溶性ポリマー及びアクリル系の水溶性自己乳化型エポキシ硬化剤を含有することを特徴とするインクジェット用記録シートを提供するに至った。 As a result of intensive studies, the inventor of the present invention, in an inkjet recording sheet that forms an image using an aqueous pigment ink, the image receiving layer of the recording sheet is composed of two types, an aqueous urethane resin and an aqueous acrylic resin, and oxazoline as a crosslinking agent. An ink-jet recording sheet comprising a water-soluble polymer having a group and an acrylic water-soluble self-emulsifying epoxy curing agent has been provided.

ウレタン樹脂は、ポリエステル系、ポリエーテル系等が例示できる。カチオン性ポリエーテル系ウレタン樹脂が好ましいが、必要に応じて他のウレタン樹脂を用いても良い。 Examples of the urethane resin include polyesters and polyethers. Cationic polyether urethane resins are preferred, but other urethane resins may be used as necessary.

アクリル樹脂は、アクリル 酸エステルおよびメタクリル酸エステルの重合体または共重合体等のアクリル 系重合体樹脂、または、エチレン−酢酸ビニル、エチレン−アクリル −酢酸ビニル、エチレン−塩化ビニル−酢酸ビニル等のエチレン−酢酸ビニル共重合体樹脂、アクリル・スチレン共重合体樹脂等が例示できる。カチオン性アクリル・スチレン共重合体樹脂が好ましいが、必要に応じて他のアクリル樹脂を用いても良い。 The acrylic resin may be an acrylic polymer resin such as a polymer or copolymer of acrylic acid ester and methacrylic acid ester, or ethylene such as ethylene-vinyl acetate, ethylene-acrylic-vinyl acetate, ethylene-vinyl chloride-vinyl acetate. -Vinyl acetate copolymer resin, acrylic-styrene copolymer resin, etc. can be illustrated. Cationic acrylic / styrene copolymer resins are preferred, but other acrylic resins may be used if necessary.

受像層固形分中のウレタン樹脂とアクリル樹脂の重量比は、ウレタン樹脂が65〜85%で、アクリル樹脂が15〜35%のものが好ましい。さらには、ウレタン樹脂が70〜80%で、アクリル樹脂が20〜30%のものが好ましい。ウレタン樹脂が65%を下回るとインク吸収性が不十分であり、85%を上回ると耐水性が悪くなる。アクリル樹脂が15%を下回ると基材との密着が悪くなり耐水性が不十分であり、35%より大きくなるとインク吸収性、乾燥性が不十分で且つ、印刷画像に滲みを生じる。 The weight ratio of the urethane resin and the acrylic resin in the solid content of the image receiving layer is preferably 65 to 85% for the urethane resin and 15 to 35% for the acrylic resin. Furthermore, it is preferable that the urethane resin is 70 to 80% and the acrylic resin is 20 to 30%. If the urethane resin is less than 65%, the ink absorbency is insufficient, and if it exceeds 85%, the water resistance is deteriorated. When the acrylic resin is less than 15%, the adhesion to the substrate is poor and the water resistance is insufficient. When the acrylic resin is greater than 35%, the ink absorbability and the drying property are insufficient and the printed image is blurred.

受像層固形分中に含まれるオキサゾリン基を有する水溶性ポリマーは0.3〜2.0%が好ましい。さらには、0.5〜1.5%が好ましい。受像層固形分中に含まれるオキサゾリン基を有する水溶性ポリマーが0.5%を下回ると充分な耐水性を得ることができず、1.5%を上回るとインク吸収性、乾燥性が低下する。アクリル系の水溶性自己乳化型エポキシ硬化剤は2.0〜3.7%が好ましい。さらには、2.5〜3.5%が好ましい。アクリル系の水溶性自己乳化型エポキシ硬化剤が2.5%を下回ると充分な耐水性を得られず、また、インクの定着力も低下する。また、3.5%を上回ると、インク吸収性が低下する。 The water-soluble polymer having an oxazoline group contained in the solid content of the image-receiving layer is preferably 0.3 to 2.0%. Furthermore, 0.5 to 1.5% is preferable. If the water-soluble polymer having an oxazoline group contained in the solid content of the image-receiving layer is less than 0.5%, sufficient water resistance cannot be obtained, and if it exceeds 1.5%, ink absorbency and drying properties are lowered. . The acrylic water-soluble self-emulsifying type epoxy curing agent is preferably 2.0 to 3.7%. Furthermore, 2.5 to 3.5% is preferable. If the acrylic water-soluble self-emulsifying type epoxy curing agent is less than 2.5%, sufficient water resistance cannot be obtained, and the fixing ability of the ink also decreases. On the other hand, if it exceeds 3.5%, the ink absorbability is lowered.

基材は、ポリエステル、ポリオレフィン、ポリ塩化ビニル等の合成樹脂フィルム、合成紙等の紙が挙げられる。また、基材はコロナ放電処理などの表面処理によりインク受像層のコーティング性を改善させることもできる。基材の厚みは25〜400μmの範囲が好ましく、プリンタへの装着性や取り扱いを考慮すると50〜300μmが好ましい。基材の厚みが25μm未満では、ハンドリングやプリンタでの装着性が悪いほか、プリンタに装着した記録材がフィードされる際に皺が発生したり等正常に紙送りされないことがある。また、基材が400μmを超えるとプリンタへの装着が困難になったり、正常に紙送りされないことがある。 Examples of the base material include synthetic resin films such as polyester, polyolefin, and polyvinyl chloride, and paper such as synthetic paper. Further, the coating property of the ink image-receiving layer can be improved by surface treatment such as corona discharge treatment. The thickness of the substrate is preferably in the range of 25 to 400 [mu] m, and is preferably 50 to 300 [mu] m in consideration of the mountability to the printer and handling. If the thickness of the substrate is less than 25 μm, handling and printer mounting properties are not good, and paper may not be fed normally, such as wrinkles when the recording material mounted on the printer is fed. If the substrate exceeds 400 μm, it may be difficult to mount the printer on the printer or the paper may not be fed normally.

インク受像層の厚みは、5〜50μmが好ましく、さらには10〜30μmが好ましいが、これに限定するものではない。上述により得られたインクジェット用記録シートは必要に応じて粘着層を設けることも可能である。 The thickness of the ink image-receiving layer is preferably 5 to 50 μm, more preferably 10 to 30 μm, but is not limited thereto. The ink jet recording sheet obtained as described above can be provided with an adhesive layer as required.

以下に実施例を挙げて本発明を具体的に説明するが、本発明がこれによって限定されるものではない。 EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited thereto.

基材として帝人デュポンフィルム株式会社製ポリエステルフィルムを使用し、その基材の一方に、乾燥重量比がポリエーテル系ウレタン樹脂(第一工業製薬株式会社 スーパーフレックス600 固形分25%)72%、アクリル・スチレン共重合樹脂(中央理化工業株式会社 リカボンド FK-820 固形分39%)24%、オキサゾリン基を有する水溶性ポリマー(固形分40%)0.5%、アクリル系の水溶性自己乳化型エポキシ硬化剤として、メタクリル酸・アクリル酸ブチル・メタクリル酸メチル・スチレン共重合物とポリエチレンイミンのグラフト化物の塩化水素中和物(固形分49%)3.5%となるようにイオン交換水に順次投入し攪拌処理を行なった後、乾燥塗膜が16μmとなるようにインク受像層を設けてインクジェット用記録シートを得た。 A polyester film manufactured by Teijin DuPont Films Ltd. is used as a base material. One of the base materials has a dry weight ratio of 72% polyether urethane resin (Daiichi Kogyo Seiyaku Co., Ltd. Superflex 600, solid content 25%), acrylic. -Styrene copolymer resin (Chuo Rika Kogyo Co., Ltd. Rikabond FK-820 solid content 39%) 24%, water-soluble polymer with oxazoline group (solid content 40%) 0.5%, acrylic water-soluble self-emulsifying epoxy As a curing agent, it is gradually added to ion-exchanged water so that the hydrogen chloride neutralized product (solid content 49%) of the grafted product of methacrylic acid / butyl acrylate / methyl methacrylate / styrene copolymer and polyethyleneimine is 3.5%. After stirring and stirring, an ink image-receiving layer is provided so that the dried coating film has a thickness of 16 μm. To obtain a recording sheet.

実施例1で用いたオキサゾリン基を有する水溶性ポリマーの乾燥重量比を1.5%、アクリル系の水溶性自己乳化型エポキシ硬化剤の乾燥重量比を2.5%とした以外は、実施例1と同様にしてインクジェット用記録シートを得た。
(比較例1)
Except that the dry weight ratio of the water-soluble polymer having an oxazoline group used in Example 1 was 1.5% and the dry weight ratio of the acrylic water-soluble self-emulsifying epoxy curing agent was 2.5%, In the same manner as in Example 1, an ink jet recording sheet was obtained.
(Comparative Example 1)

実施例1で用いたオキサゾリン基を有する水溶性ポリマー及びアクリル系の水溶性自己乳化型エポキシ硬化剤を添加しない以外は、実施例1と同様にしてインクジェット用記録シートを得た。
(比較例2)
An ink jet recording sheet was obtained in the same manner as in Example 1 except that the water-soluble polymer having an oxazoline group and the acrylic water-soluble self-emulsifying epoxy curing agent used in Example 1 were not added.
(Comparative Example 2)

実施例1で用いたオキサゾリン基を有する水溶性ポリマーを添加せず、アクリル系の水溶性自己乳化型エポキシ硬化剤を4.0%とした以外は、実施例1と同様にしてインクジェット用記録シートを得た。。
(比較例3)
Inkjet recording sheet in the same manner as in Example 1 except that the water-soluble polymer having an oxazoline group used in Example 1 was not added and the acrylic water-soluble self-emulsifying epoxy curing agent was 4.0%. Got. .
(Comparative Example 3)

実施例1で用いたアクリル系の水溶性自己乳化型エポキシ硬化剤を添加せず、オキサゾリン基を有する水溶性ポリマーを4.0%とした以外は、実施例1と同様にしてインクジェット用記録シートを得た。
(比較例4)
Inkjet recording sheet as in Example 1 except that the acrylic water-soluble self-emulsifying epoxy curing agent used in Example 1 was not added and the water-soluble polymer having an oxazoline group was 4.0%. Got.
(Comparative Example 4)

実施例1で用いたウレタン樹脂を添加しない以外は、実施例1と同様にしてインクジェット用被記録材を得た。
(比較例5)
An inkjet recording material was obtained in the same manner as in Example 1 except that the urethane resin used in Example 1 was not added.
(Comparative Example 5)

実施例1で用いたアクリル樹脂を添加しない以外は、実施例1と同様にしてインクジェット用記録シートを得た。 An ink jet recording sheet was obtained in the same manner as in Example 1 except that the acrylic resin used in Example 1 was not added.

このようにして得られたインクジェット用記録シートを、セイコーエプソン株式会社製、MC-2000を用いイエロー・マゼンタ・シアン・ブラックの文字およびベタを印字し評価を行った。インク吸収性、乾燥性の評価は、印字後、綿棒で印字部表面を擦り、綿棒に付着したインクの状態を目視で確認した。○:綿棒にインクが付着しない、×:綿棒にインクが付着している。耐水性の評価は、印字物を水に浸漬し3時間放置後、指で擦り受像層の耐水性、インクの定着性を確認した。○:指で擦っても、受像層、インクがとれない、×:指で擦ると受像層及びインクが取れてしまう。発色性の評価は印字部を目視にて確認した。○:印刷画像が鮮明である、×:滲みが生じている The ink jet recording sheet thus obtained was evaluated by printing yellow, magenta, cyan, and black characters and solids using MC-2000 manufactured by Seiko Epson Corporation. The ink absorbability and the drying property were evaluated by rubbing the surface of the printed part with a cotton swab after printing, and visually confirming the state of the ink attached to the cotton swab. ○: Ink does not adhere to the cotton swab, ×: Ink adheres to the cotton swab. The water resistance was evaluated by immersing the printed matter in water and allowing it to stand for 3 hours, and then rubbing with a finger to confirm the water resistance of the image receiving layer and the ink fixing property. ○: Image receiving layer and ink cannot be removed by rubbing with a finger. ×: Image receiving layer and ink are removed by rubbing with a finger. The evaluation of color development was made by visually checking the printed part. ○: The printed image is clear, ×: Bleeding occurs

これらの結果を表1に示す。 These results are shown in Table 1.

Figure 2005074880
Figure 2005074880

Claims (1)

水性顔料インクを用いて画像を形成するインクジェット用記録シートにおいて、該記録シートの受像層が、水性ウレタン樹脂、水性アクリル樹脂の2種からなり、架橋剤としてオキサゾリン基を有する水溶性ポリマー及びアクリル系の水溶性自己乳化型エポキシ硬化剤を含有することを特徴とするインクジェット用記録シート  In an ink jet recording sheet for forming an image using an aqueous pigment ink, the image receiving layer of the recording sheet is composed of two types, an aqueous urethane resin and an aqueous acrylic resin, a water-soluble polymer having an oxazoline group as a crosslinking agent, and an acrylic type Inkjet recording sheet comprising a water-soluble self-emulsifying epoxy curing agent
JP2003309909A 2003-09-02 2003-09-02 Transparent inkjet recording sheet Expired - Fee Related JP4127531B2 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009248356A (en) * 2008-04-02 2009-10-29 Union Chemicar Co Ltd Ink-jet receiving layer
CN101927632A (en) * 2009-06-23 2010-12-29 精工爱普生株式会社 Recording sheet for inkjet
JP2012006242A (en) * 2010-06-24 2012-01-12 Seiko Epson Corp Inkjet recording medium

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009248356A (en) * 2008-04-02 2009-10-29 Union Chemicar Co Ltd Ink-jet receiving layer
CN101927632A (en) * 2009-06-23 2010-12-29 精工爱普生株式会社 Recording sheet for inkjet
EP2266811A1 (en) 2009-06-23 2010-12-29 Seiko Epson Corporation Inkjet recording sheet
US8337011B2 (en) 2009-06-23 2012-12-25 Seiko Epson Corporation Inkjet recording sheet
JP2012006242A (en) * 2010-06-24 2012-01-12 Seiko Epson Corp Inkjet recording medium
US8512827B2 (en) 2010-06-24 2013-08-20 Seiko Epson Corporation Ink jet recording medium

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