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TW200944848A - Method of manufacturing polarizing plate - Google Patents

Method of manufacturing polarizing plate Download PDF

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Publication number
TW200944848A
TW200944848A TW097146446A TW97146446A TW200944848A TW 200944848 A TW200944848 A TW 200944848A TW 097146446 A TW097146446 A TW 097146446A TW 97146446 A TW97146446 A TW 97146446A TW 200944848 A TW200944848 A TW 200944848A
Authority
TW
Taiwan
Prior art keywords
polarizing plate
adhesive
polarizer
laminate
film
Prior art date
Application number
TW097146446A
Other languages
Chinese (zh)
Other versions
TWI372892B (en
Inventor
Hiromichi Noma
Tomoyasu Takeuchi
Rikiya Matsumoto
Original Assignee
Sumitomo Chemical Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Chemical Co filed Critical Sumitomo Chemical Co
Publication of TW200944848A publication Critical patent/TW200944848A/en
Application granted granted Critical
Publication of TWI372892B publication Critical patent/TWI372892B/en

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/0007—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding involving treatment or provisions in order to avoid deformation or air inclusion, e.g. to improve surface quality
    • B32B37/0015—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding involving treatment or provisions in order to avoid deformation or air inclusion, e.g. to improve surface quality to avoid warp or curl
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L29/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical; Compositions of hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Compositions of derivatives of such polymers
    • C08L29/02—Homopolymers or copolymers of unsaturated alcohols
    • C08L29/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/14—Protective coatings, e.g. hard coatings
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Nonlinear Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Quality & Reliability (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)

Abstract

To provide a manufacturing method and manufacturing equipment of a polarizing plate, in which the occurrence of reverse curl and wave curl is suppressed. ; SOLUTION: The method of manufacturing the polarizing plate prepared by stacking and adhering protective films 31, 32 respectively on both surfaces of a polarizer 35 comprises: a step of overlapping the polarizer 35 and the protective films 31, 32 via adhesives to obtain a laminate 37; and a subsequent step of adhering the laminate 37 onto a convex curved surface formed in an arcuate shape along the conveyance direction of the laminate 37, preferably on the outer surface of a roller 38 and, at the same time, irradiating an adhesive with active energy rays from active energy ray irradiation devices 39, 40 to polymerize and harden the adhesive.

Description

200944848 九、發明說明 【發明所屬之技術領域】 本發明係有關適用於作爲構成液晶顯示裝置之光學構 件之一的偏光板之製造方法。 【先前技術】 偏光板係適用於作爲構成液晶顯示裝置之光學構件之 ❹ 一。圖4代表於液晶盒（Liquid crystal cell)層合1種偏光 板之直線偏光薄膜的構造。構成液晶顯示面板之液晶盒 10之光源側表面藉由黏著劑層11，使直線偏光薄膜12被 黏著層合，構成液晶顯示面板。 偏光板通常於偏光子之雙面層合保護薄膜之狀態下， 組裝於液晶顯示裝置被使用。亦即，如圖5所示，一般的 偏光板20係於偏光子21之雙面介面黏著劑層24、25使 保護薄膜22、23進行層合黏著（特開2004-245925號公報 ❹ 、特開2005-1 7321 6號公報）。 惟，如此所製造之偏光板，其黏著於液晶盒側出現形 成凹狀卷縮（以下稱「逆卷縮」）、或使偏光板整體呈波浪 狀（以下將此稱爲「波浪型卷縮」）。該逆卷縮及波浪型卷 縮係在黏著於液晶盒時，於黏著面容易殘留氣泡造成液晶 面板不良之起因。因此，被期待偏光板未出現逆卷縮及波 浪型卷縮，無卷縮、或即使卷縮，而黏著於液晶盒側呈現 凸狀卷縮（以下稱「正卷縮」）者。 200944848 【發明內容】 本發明之目的係提供一種抑制逆卷縮及波浪型卷縮產 生之偏光板的製造方法及製造裝置。 本發明者爲達成上述目的，進行精密硏討後，結果發 現使於偏光子單面或雙面介由黏著劑層合保護薄膜之層合 - 體於呈正卷縮之彎曲狀態下，使黏著劑藉由聚合硬化後， 可抑制逆卷縮及波浪型卷縮的產生，進而完成本發明。 亦即，本發明偏光板的製造方法係於偏光子之單面或 © 雙面分別層合黏著劑保護薄膜之偏光板的製造方法，介由 黏著劑使該偏光子與保護薄膜重疊，得到層合體，接著沿 著此層合體之長邊方向（搬運方向）使該層合體密合於形成 圓弧狀之凸彎面，同時使該黏著劑進行聚合硬化。該凸彎 面可使用如：滾輥之外圍面。 作爲該偏光子者，如：單軸延伸之碘或雙色性染料被 吸附定向之聚乙烯醇薄膜，作爲該保護薄膜之一方者，如 :非晶性聚烯烴系樹脂薄膜，作爲其另一方者如：三乙醯 〇 纖維素薄膜之例，惟，並未受限於此等。 對密合於該凸彎面之層合體照射活化能線，使聚合硬 化者宜，亦可加熱後，進行聚合硬化。 又，本發明偏光板之製造裝置係具備：於保護薄膜的 單面或偏光子之雙面上塗佈黏著劑之步驟、與介面黏著劑 層於偏光子之單面或雙面上重疊保護薄膜之步驟、以及爲 使黏著劑進行聚合硬化之步驟之偏光板的製造裝置，爲使 該黏著劑進行聚合硬化之手段包含使重疊保護薄膜之偏光 -6- 200944848 子密合於外圍面，同時進行搬運之滾輥，以及往該滾輥之 外圍面照射活化能線之活化能線照射裝置。 本發明使介由黏著劑使偏光子與保護薄膜重疊之層合 體藉由密合於沿著此層合體長邊方向（搬運方向）形成圓弧 狀之凸彎面，同時照射活化能線，使黏著劑聚合硬化後， 使偏光板黏著於液晶盒時，可抑制殘留氣泡於黏著面導致 產生不良液晶面板原因之逆卷縮及波浪狀卷縮的發生。 ❹ 【實施方式】 [發明實施之最佳形態] 以下，進行本發明之一實施形態的說明。該實施形態 之偏光板係由偏光子及介由黏著劑層合於其雙面之保護薄 膜所成。該偏光子，可使用先行技術之用於偏光板製造者 (如：上述之特開2〇〇4-245925號公報所載之偏光子），通 常，於單軸延伸之聚乙烯醇薄膜經由碘或雙色性染料進行 G 染色，再進行硼酸處理所成之薄膜例。偏光子之厚度爲5 〜5 0 μιη者宜。 於該偏光子雙面所層合之保護薄膜可爲同種類，亦可 爲不同類者。使用不同類之保護薄膜時，作爲保護薄膜之 一者如：非晶性聚烯烴樹脂薄膜、聚酯樹脂薄膜、丙烯酸 樹脂薄膜、聚碳酸酯樹脂薄膜、聚碾樹脂薄膜、脂環式聚 醯胺樹脂薄膜等之透濕度低之樹脂薄膜被使用之。非晶性 聚烯烴樹脂薄膜中，如：德國之Ticona公司製之「topas 」、JSR(股份）公司製之「Arton」、日本Zeon(股份）公司 200944848 製之「ZEONOR」、「ZEONEX」、三井化學（股份）公司 製之「Apel」等。作爲保護薄膜之另一者除此等薄膜之外 ，使用如：三乙醯纖維素薄膜、二乙醯纖維素薄膜之纖維 素乙酸酯系之樹脂薄膜。三乙醯纖維素薄膜中，如：富士 照片薄膜（股份）公司製之「Fujitac TD80」、「Fujitac TD80UF」及「Fujitac TD80UZ」、Konica(股份）公司製之 「KC8UX2M」及「KC8UY」等。 作爲保護薄膜者，預先往偏光子之貼合，亦可於貼合 d 面進行皂化處理，電暈處理、電漿處理、固定塗層處理等 之簡單黏著處理。又，對於保護薄膜之偏光子的貼合面與 反側之表面亦可具有硬塗層層、抗反射層、防反光層等之 各種處理層。保護薄膜之厚度通常爲5〜200μηι之範圍者 宜’較佳者爲10〜120μιη，更佳者爲10〜85μιη。 作爲黏著劑者，由其耐氣候性、折射率、陽離子聚合 性等之觀點視之，可使如：特開2004-245925號公報所載 之分子內不含芳香環之環氧樹脂用於黏著劑，惟，並未受 0 限於此等，可採用先行技術之偏光板製造所使用之各種黏 著劑。作爲上述之環氧樹脂者，可使用如：氫化環氧樹脂 、脂環環氧樹脂、脂肪族環氧樹脂等。於環氧樹脂成份中 添加聚合啓始劑，如爲以活化能線照射聚合之光陽離子聚 合啓始劑，爲經由加熱聚合之熱陽離子聚合啓始劑，更有 其他添加劑（增敏劑等），調製塗佈用黏著劑組成物。 接著，參考圖面，同時進行本發明偏光板之製造裝置 及製造方法之說明。圖1代表本發明偏光板製造裝置之一 -8- 200944848 實施形態之槪略圖。 示於圖1之偏光板製造裝置30係使爲塗佈黏著劑於 保護薄膜31、32之單面之黏著劑塗佈裝置33、34，與爲 重疊保護薄膜31、32、偏光子35之捏合滾輥36、與爲使 該保護薄膜31、32與偏光子35貼合之層合體37密合之 滾輥38，以及與該滾輥38之外圍面對向之位置所設置之 第1活化能線照射裝置39、40,以及進一步由此於搬運 ❹ 方向下流側所設置之第2活化能線照射裝置41、及搬運 用捏合滾輥42，依序沿著搬運方向設置之。 亦即，由呈滾輥狀卷回之狀態連續性繞線之保護薄膜 31、32係經由黏著劑塗佈裝置33、34將黏著劑塗佈於單 面。接著，分別於相同於該保護薄膜31、32連續性繞線 之偏光子35之雙面使保護薄膜31、32藉由捏合滾輥36 ，介由黏著劑形成重叠之層合體37。使該層合體37密合 於滾輥38之外圍面，同時於搬運過程，由第1活化能線 © 照射裝置39、40往滾輥38之外圍面，照射活化能線，使 黏著劑聚合硬化。另外，配置於搬運方向下流側之第2活 化能線照射裝置41，爲使黏著劑完全聚合硬化之裝置， 於必要時可省略。 對於保護薄膜31、32之黏著劑塗佈方法，並未特別 限定，一般可利用如：塗膠刀、金屬線棒、塑模塗佈（die coater)、逗號式刮刀塗佈、照相凹版塗佈等各種塗佈方式 ，其中，考量對應薄膜塗佈、軋製線之自由度、寬幅等， 作爲黏著劑塗佈裝置33、34者以照相凹版滾輥爲較佳。 -9- 200944848 利用照相凹版滾輥作爲黏有劑塗佈裝置‘ 33、34，進 行黏著劑之塗佈時，黏著劑層之厚度藉由對於線速度之照 相凹版滾輥之速度比之描繪比進行調整。將保護薄膜31 、32之線速度作成15〜50m/分鐘，使照相凹版滾輥與該 保護薄膜31、32之搬運方向呈逆向旋轉，將照相凹版滾 輥之速度作成5〜500m/分鐘（延伸比（draw radio)l〜10)後 ，調整黏著劑層之塗佈厚度約爲1〜ΙΟμιη。 滾輥38其外圍面構成鏡面加工之凸彎面，使層合體 @ 37密合於其表面，同時進行搬運，於其過程中，使黏著 劑藉由活化能、線照射裝置39、40進行聚合硬化。使黏著 劑聚合硬化，充份密合層合體37後，滾輥38之直徑並未 特別限定，一般黏著層未硬化狀態之層合體37於通過滾 輥38時，使活化能線於紫外線之累積光量下以30mJ/Cm2 進行照射者宜。滾輥38可隨著層合體37之動線移動，或 旋轉驅動均可，抑或固定後，使表面滑動層合體37亦可 。又，滾輥3 8經由活化能線之照射，於聚合硬化時不易 ^ 加熱於層合體37，故亦可作爲冷卻滾輥之作用。此時之 冷卻滾輥之表面溫度爲20〜25 °C者宜。 藉由活化能線之照射進行聚合硬化時，所使用之光源 並未特定，通常於波長400mm以下具有發光分佈，可使 用如：低壓水銀燈、中壓水銀燈、高壓水銀燈、超高壓水 銀燈、化學燈、黑光燈、微波激起水銀燈、金屬鹵素燈等 。對於環氧樹脂組成物之光照射強度係取決於每個目的組 成物，仍未有特別限定，通常於啓始劑之活化有效之波長 -10- 200944848 領域之照射強度爲0· 1〜1 00mJ/cm2者宜。對於樹脂組成 物之光照射強度若未達0.1m J/cm2則反應時間變得太長， 反之超出1 OOmJ/cm2則藉由由燈所輻射之熱及組成物聚合 時之發熱’可能產生環氧樹脂組成物之泛廣、偏光子之劣 化。 對於組成物之活化能線的照射時間乃被每個硬化之組 成物所控制者，仍未有特別限定，通常，使作爲照射強度 〇 與照射時間之積所代表之累積光量設定爲10〜5,000mJ/cm2 者宜。如：對於該環氧樹脂組成物之累積光量若未達 1 OmJ/cm2則將未能充份產生源於啓始劑之活化種，得到 之保護薄膜的硬化可能不足，反之該合計光量若超出 5，000m J/cm2則照射時間將變得極長，不利生產性的提昇 〇 將紫外線作爲活化能線時，層合體3 7之線速度並未 特別限定，往長邊方向（搬運方向）1 00〜800N之張力下， 又，使照射強度至少爲3 Om J/cm2以上，使照射時間爲0.3 秒以上之條件下，於層合體3 7中照射活化能線者宜。另 外，於經由活化能線裝置3 9，40之活化能線之照射下其 累積光量不足時，亦可設置補助的第2活化能線裝置41 ，追加照射活化能線，完成層合體3 7之黏著劑之聚合。 如此得到之偏光板相較於以特定張力呈水平搬運通過 如先行技術之活化能線裝置之下時（參考圖3)，其較可抑 制逆卷縮及波浪型卷縮的產生，因此貼附於液晶盒時，不 會殘留氣泡於黏著面，而可減少產生不良的液晶面板。 -11 - 200944848 以下，以實施例爲例進行本發明具體的說明’惟本發 明並未受限於以下之實施例。 [實施例1] 準備厚度75μιη之非晶性聚烯烴樹脂薄膜「ZEONOR 」（日本Zeon公司製）、與厚度80μιη之三乙醯纖維素薄膜 「KC8UX2MW」（konicaminorta公司製）。分別於非晶性 聚烯烴樹脂薄膜及三乙醯纖維素薄膜之單面利用黏著劑塗 佈裝置之微室刮漿刀（富士機械公司製）塗佈作爲黏著劑之 環氧樹脂組成物「KRX492-3 0」（ADEKA公司製）。使層合 體之線速度作爲11m/分鐘，使照相凹版滾輥與層合材料 之搬運方向呈反方向進行旋轉，作成照相凹版滾輥之速度 2 2m/分鐘後，使黏著劑層之厚度作成約爲2μιη。 接著，於厚度25μιη之碘被吸附定向之聚乙烯醇系薄 膜之雙面，介由該環氧樹脂組成物使該非晶性聚烯烴樹脂 薄膜與該三乙醯纖維素薄膜藉由捏合滾輥進行重疊。 使該偏光板通過由紫外線照射裝置（GS-YUASA公司 製）所具備之紫外線燈之EHAN1 700NAL高壓水銀燈2燈 所照射之紫外線中，通過條件係往長邊方向600Ν之張力 下，使該偏光板之三乙醯纖維素薄膜所層合之面密合於 2 3 °C之冷卻滾輥之外圍面，同時線速度爲丨lm/分鐘之條 件下進行通過。此時之紫外線累積光量爲ll〇(mj/cm2)。 紫外線之累積光量係以波長域280〜320nm之UVB領域下 之照射爲基準所測計者。之後，使寬度方向爲1 3 3 0mm之 200944848 層合體往長邊方向於600mm剪切後，依下述方法評定波 浪型卷縮之狀況。 亦即’如圖2(A)所示，分別測定使三乙醯纖維素薄 膜所貼合之面作成下面之偏光板50之波數、波長、振幅 之値。波數係並列於偏光板50之寬度方向之波峰數，圖 2(B)所示之波長51係測定偏光板50之波峰之頂點間的距 離。又’同圖（A)所示之振幅52係測定使偏光板50往寬 Ο 度方向作成5等份之a〜e各個處所中峰與谷之頂點的長 度後’作成其一半之値。此等測定結果示於表i。 [實施例2] 除將紫外線累積光量作爲143(mJ/cm2)之外，與實施 例1同法得到偏光板，結果示於表 [比較例1 ] 介由作爲黏著劑之環氧樹脂組成物「KRX492-3 2」 (ADEKA公司製）層合非晶性聚嫌煙樹脂薄膜與三乙酿纖 維素薄膜於聚乙烯醇薄膜雙面之層合體60，於600N之張 力下’未密合於滾輥，往水平方向以線速度llm/分鐘通 過由圖3所示之紫外線照射裝置6l(fushion公司）所具備 之紫外線燈之LH1〇-6〇Uv無電極燈1燈所照射之紫外線 中’進行聚合硬化。此時紫外線之合計光量爲119(mj/cm2)。 此外，與實施例1同法得到偏光板。結果示於表1。 -13- 200944848 [比較例2 ] 除使紫外線合計光量作成27(mJ/cm2)偏光之外，與比 較例1同法操作。結果示於表1。 [表1] 實施例1 實施例2 比較例1 比較例2 UV照射方法 滾輥 有 滾輥 有 滾輥 ίκ y» \\ 滾輥 ^ττΤ m UV累積光量 (mJ/cm2) 110 143 119 27 波數 (個） 0 0 17 11 波長 (mm) 0 0 67.65 104.55 振幅 (mm) 1 0 0 13.25 4 2 0 0 13.5 4.75 3 0 0 12.75 5 4 0 0 12.5 6 5 0 0 14.25 4.25BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a polarizing plate which is suitable for use as one of optical members constituting a liquid crystal display device. [Prior Art] The polarizing plate is suitable for use as an optical member constituting a liquid crystal display device. Fig. 4 shows the structure of a linear polarizing film in which a polarizing plate is laminated on a liquid crystal cell. The light source side surface of the liquid crystal cell 10 constituting the liquid crystal display panel is adhered to the linear polarizing film 12 by the adhesive layer 11, thereby constituting a liquid crystal display panel. The polarizing plate is usually assembled in a liquid crystal display device in a state in which a protective film is laminated on both sides of a polarizer. That is, as shown in FIG. 5, the general polarizing plate 20 is attached to the double-sided interface adhesive layers 24 and 25 of the polarizer 21 to laminate the protective films 22 and 23 (Japanese Patent Laid-Open Publication No. 2004-245925) Open 2005-1 7321 No. 6 bulletin). However, the polarizing plate thus produced has a concave crimp (hereinafter referred to as "reverse crimping") on the side of the liquid crystal cell, or a wave shape as a whole of the polarizing plate (hereinafter referred to as "wave type crimping" "). When the reverse crimping and the wave-type crimping are adhered to the liquid crystal cell, bubbles are likely to remain on the adhesive surface, causing a defect in the liquid crystal panel. Therefore, it is expected that the polarizing plate is not subjected to reverse crimping and wave-type crimping, and is not crimped, or curled, and adhered to the liquid crystal cell side in a convex crimp (hereinafter referred to as "positive crimping"). SUMMARY OF THE INVENTION An object of the present invention is to provide a method and apparatus for manufacturing a polarizing plate which suppresses occurrence of reverse crimping and wave-type crimping. In order to achieve the above object, the present inventors have found that the laminate of the protective film is laminated on the single or double side of the polarizer, and the adhesive is laminated in a positively crimped state to make the adhesive. After the polymerization is hardened, the occurrence of reverse crimping and wave-type crimping can be suppressed, and the present invention can be completed. That is, the method for producing a polarizing plate of the present invention is a method for manufacturing a polarizing plate in which a single layer of a polarizer or a double-sided adhesive protective film is laminated, and the polarizer is overlapped with the protective film via an adhesive to obtain a layer. In combination, the laminate is adhered to the convex curved surface forming the arc shape along the longitudinal direction (transport direction) of the laminate, and the adhesive is polymerized and cured. For the convex curved surface, for example, the outer surface of the roller can be used. As the polarizer, for example, a uniaxially stretched iodine or a dichroic dye is adsorbed and oriented as a polyvinyl alcohol film, and as one of the protective films, such as an amorphous polyolefin resin film, as the other one. For example, an example of a triacetone cellulose film is not limited thereto. The laminate which is adhered to the convex curved surface is irradiated with an activation energy line to be hardened by polymerization, and may be heated and then cured. Moreover, the apparatus for manufacturing a polarizing plate of the present invention includes a step of applying an adhesive on one side of the protective film or both sides of the polarizer, and overlapping the protective film with the interface adhesive layer on one side or both sides of the polarizer. In the step of manufacturing the polarizing plate for the step of polymerizing and curing the adhesive, the means for polymerizing and curing the adhesive includes bonding the polarizing film of the overlapping protective film to the peripheral surface, and simultaneously performing the method. The roller for transporting, and the activation energy line irradiation device that irradiates the activation energy line to the peripheral surface of the roller. According to the present invention, the laminate in which the polarizer and the protective film are overlapped by the adhesive is adhered to a convex curved surface which is formed in an arc shape along the longitudinal direction (transport direction) of the laminate, and simultaneously irradiates the activation energy line. After the adhesive is polymerized and cured, when the polarizing plate is adhered to the liquid crystal cell, the occurrence of back curling and wavy crimping which causes the occurrence of a defective liquid crystal panel on the adhesive surface can be suppressed. [Embodiment] [Best Mode for Carrying Out the Invention] Hereinafter, an embodiment of the present invention will be described. The polarizing plate of this embodiment is formed of a polarizer and a protective film laminated on both sides thereof via an adhesive. The polarizer can be used for a polarizing plate manufacturer using a prior art technique (for example, the polarizer described in the above-mentioned JP-A No. 2-4-245925), and usually, a uniaxially stretched polyvinyl alcohol film is passed through iodine. Or a dye film obtained by performing G-staining with a dichroic dye and then performing boric acid treatment. The thickness of the polarizer is preferably 5 to 5 0 μηη. The protective film laminated on both sides of the polarizer may be of the same type or different types. When using different types of protective films, one of the protective films is: amorphous polyolefin resin film, polyester resin film, acrylic resin film, polycarbonate resin film, polycrystalline resin film, alicyclic polyamide A resin film having a low moisture permeability such as a resin film is used. Among the amorphous polyolefin resin films, "topas" manufactured by Ticona Co., Ltd., "Arton" manufactured by JSR (Stock) Co., Ltd., "ZEONOR" manufactured by Japan Zeon Co., Ltd. 200944848, "ZEONEX", Mitsui "Apel" made by Chemical (Stock) Co., Ltd., etc. As the other of the protective films, in addition to these films, a cellulose acetate-based resin film such as a triacetone cellulose film or a diethylcellulose film is used. Among the triacetone cellulose films, such as "Fujitac TD80", "Fujitac TD80UF" and "Fujitac TD80UZ" manufactured by Fuji Photo Film Co., Ltd., "KC8UX2M" and "KC8UY" manufactured by Konica Corporation. As a protective film, it is possible to apply a saponification treatment, a corona treatment, a plasma treatment, a fixing coating treatment, or the like to the bonding of the polarizing elements in advance. Further, the bonding surface and the reverse side surface of the polarizer of the protective film may have various treatment layers such as a hard coat layer, an antireflection layer, and an antireflection layer. The thickness of the protective film is usually in the range of 5 to 200 μm, preferably '10 to 120 μm, more preferably 10 to 85 μm. As an adhesive, an epoxy resin containing no aromatic ring in the molecule as disclosed in JP-A-2004-245925 can be used for adhesion as a viewpoint of weather resistance, refractive index, cationic polymerization property, and the like. Agents, however, are not limited to this, and various adhesives used in the manufacture of polarizing plates of the prior art can be used. As the above epoxy resin, for example, a hydrogenated epoxy resin, an alicyclic epoxy resin, an aliphatic epoxy resin or the like can be used. Adding a polymerization initiator to the epoxy resin component, such as a photocationic polymerization initiator which is irradiated by an activation energy ray, a thermal cationic polymerization initiator via heating polymerization, and other additives (sensitizers, etc.) A coating composition for coating is prepared. Next, a description will be given of a manufacturing apparatus and a manufacturing method of the polarizing plate of the present invention with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing an embodiment of a polarizing plate manufacturing apparatus of the present invention -8-200944848. The polarizing plate manufacturing apparatus 30 shown in Fig. 1 is formed by kneading the adhesive applying means 33, 34 for applying the adhesive to one side of the protective films 31, 32, and the overlapping protective films 31, 32 and the polarizer 35. The roller 36, the roller 38 which is in close contact with the laminate 37 for bonding the protective films 31 and 32 and the polarizer 35, and the first activation energy which is disposed at a position facing the periphery of the roller 38 The line irradiation devices 39 and 40 and the second activation energy line irradiation device 41 and the conveyance kneading roller 42 which are disposed on the downstream side in the conveyance direction are sequentially provided in the conveyance direction. In other words, the protective films 31 and 32 which are continuously wound in a roll-like state are applied to the single surface via the adhesive applying devices 33 and 34. Then, the protective films 31 and 32 are respectively formed on the both sides of the polarizer 35 which is continuous with the protective films 31 and 32, and the laminated sheets 37 are formed by the adhesive by the kneading rolls 36. The laminate 37 is adhered to the outer surface of the roller 38, and at the same time, the first activation energy line © the irradiation device 39, 40 is applied to the peripheral surface of the roller 38, and the activation energy line is irradiated to cure the adhesive. . Further, the second active energy ray irradiation device 41 disposed on the downstream side in the conveyance direction is a device for completely curing and curing the adhesive, and may be omitted if necessary. The method of applying the adhesive to the protective films 31 and 32 is not particularly limited, and generally, for example, a rubber knife, a metal bar, a die coater, a comma blade coating, or a gravure coating can be used. Various coating methods, in which the degree of freedom of the film coating, the rolling line, the width, and the like are considered, and the gravure roll is preferable as the adhesive applying devices 33 and 34. -9- 200944848 Using a gravure roll as an adhesive coating device '33, 34', when applying an adhesive, the thickness of the adhesive layer is plotted by the speed ratio of the gravure roll to the linear velocity. Make adjustments. The linear velocity of the protective films 31 and 32 is set to 15 to 50 m/min to reversely rotate the gravure roll and the protective film 31, 32, and the speed of the gravure roll is set to 5 to 500 m/min (extension). After the draw radio 1~10), the coating thickness of the adhesive layer is adjusted to be about 1 to ΙΟμιη. The peripheral surface of the roller 38 constitutes a convexly curved surface of the mirror surface, so that the laminate @37 is adhered to the surface thereof while being conveyed, and in the process, the adhesive is polymerized by the activation energy, the line irradiation devices 39, 40. hardening. After the adhesive is polymerized and hardened, and the laminate 37 is sufficiently adhered, the diameter of the roll 38 is not particularly limited. Generally, the laminate 37 in the unhardened state of the adhesive layer accumulates the activation energy line in the ultraviolet light when passing through the roll 38. It is preferred to irradiate at 30 mJ/cm2 under light. The roller 38 can be moved along with the moving line of the laminated body 37, or can be rotationally driven, or the surface sliding laminate 37 can be made after being fixed. Further, since the roll 3 8 is irradiated by the activation energy line and is not easily heated to the laminate 37 during the polymerization hardening, it can also function as a cooling roll. At this time, the surface temperature of the cooling roll is preferably 20 to 25 °C. When the polymerization is hardened by irradiation of an activation energy line, the light source used is not specific, and generally has a light-emitting distribution at a wavelength of 400 mm or less, and can be used, for example, a low-pressure mercury lamp, a medium-pressure mercury lamp, a high-pressure mercury lamp, an ultra-high pressure mercury lamp, a chemical lamp, Black light, microwave, mercury lamp, metal halide lamp, etc. The light irradiation intensity of the epoxy resin composition is not particularly limited depending on each composition of the target, and is usually at a wavelength effective for activation of the initiator --10-200944848. The irradiation intensity in the field is 0·1 to 1 00 mJ. /cm2 should be appropriate. If the light irradiation intensity of the resin composition is less than 0.1 m J/cm 2 , the reaction time becomes too long, and if it exceeds 100 μJ/cm 2 , the heat radiated by the lamp and the heat generated during the polymerization of the composition may generate a ring. The oxy-resin composition is extensive and the photon is degraded. The irradiation time of the activation energy line of the composition is not particularly limited by the composition of each hardened composition, and generally, the cumulative light amount represented by the product of the irradiation intensity 〇 and the irradiation time is set to 10 to 5,000. mJ/cm2 should be suitable. For example, if the accumulated light amount of the epoxy resin composition is less than 1 OmJ/cm2, the activated species derived from the initiator may not be sufficiently produced, and the hardening of the obtained protective film may be insufficient, and if the total amount of light exceeds At 5,000 m J/cm2, the irradiation time becomes extremely long, which is unfavorable for productivity improvement. When ultraviolet rays are used as the activation energy line, the linear velocity of the laminate 37 is not particularly limited, and the longitudinal direction (transport direction) is 1 Under the tension of 00 to 800 N, it is preferable to irradiate the activation energy line in the laminate 37 under the condition that the irradiation intensity is at least 3 Om J/cm 2 or more and the irradiation time is 0.3 seconds or longer. Further, when the accumulated light amount is insufficient under the irradiation of the activation energy line of the activation energy line device 3 9, 40, the auxiliary second activation energy line device 41 may be provided, and the activation energy line may be additionally irradiated to complete the laminate 37. Polymerization of the adhesive. When the polarizing plate thus obtained is horizontally conveyed under a certain tension to pass under the activation energy line device as in the prior art (refer to FIG. 3), it can suppress the occurrence of reverse crimping and wave-type crimping, and thus attaching In the case of the liquid crystal cell, no air bubbles remain on the adhesive surface, and the liquid crystal panel which is defective can be reduced. -11 - 200944848 Hereinafter, the present invention is specifically described by way of examples, but the present invention is not limited to the following examples. [Example 1] An amorphous polyolefin resin film "ZEONOR" (manufactured by Zeon Corporation, Japan) having a thickness of 75 μm and a triacetone cellulose film (KC8UX2MW) (manufactured by Konica Minorta Co., Ltd.) having a thickness of 80 μm were prepared. An epoxy resin composition "KRX492" as an adhesive was applied to a single surface of an amorphous polyolefin resin film and a triacetyl cellulose film by a micro-chamber doctor (manufactured by Fuji Machinery Co., Ltd.) of an adhesive application device. -3 0" (made by ADEKA). The linear velocity of the laminate was set to be 11 m/min, and the gravure roll was rotated in the opposite direction to the conveyance direction of the laminate. After the speed of the gravure roll was 2 2 m/min, the thickness of the adhesive layer was made about It is 2μιη. Then, on both sides of the polyvinyl alcohol-based film in which the iodine having a thickness of 25 μm is adsorbed, the amorphous polyolefin resin film and the triethylenesulfide film are subjected to kneading by means of the epoxy resin composition. overlapping. The polarizing plate was passed through an ultraviolet ray irradiated by an EHAN1 700 NAL high-pressure mercury lamp 2 of an ultraviolet lamp provided by an ultraviolet ray irradiation device (manufactured by GS-YUASA Co., Ltd.) under the tension of 600 长 in the longitudinal direction. The laminated surface of the triacetonitrile cellulose film was adhered to the peripheral surface of the cooling roll at 23 ° C while passing at a linear velocity of 丨lm/min. The amount of accumulated ultraviolet light at this time was ll 〇 (mj/cm 2 ). The cumulative amount of ultraviolet light is measured based on the irradiation in the UVB field of the wavelength range of 280 to 320 nm. Thereafter, the 200944848 laminate having a width direction of 1 3 3 0 mm was cut at a length of 600 mm in the longitudinal direction, and the condition of the wave-type crimping was evaluated by the following method. That is, as shown in Fig. 2(A), the surface on which the triacetyl cellulose film is bonded is measured as the wave number, wavelength, and amplitude of the polarizing plate 50 below. The wave number is juxtaposed in the number of peaks in the width direction of the polarizing plate 50, and the wavelength 51 shown in Fig. 2(B) is the distance between the apexes of the peaks of the polarizing plate 50. Further, the amplitude 52 shown in the same figure (A) is measured by making the polarizing plate 50 half the length of the peaks and valleys in the respective positions a to e in the width direction of the polarizing plate 50. The results of these measurements are shown in Table i. [Example 2] A polarizing plate was obtained in the same manner as in Example 1 except that the amount of accumulated ultraviolet light was 143 (mJ/cm2), and the results are shown in Table [Comparative Example 1] by using an epoxy resin composition as an adhesive. "KRX492-3 2" (made by ADEKA Co., Ltd.) laminated amorphous polystyrene resin film and triethyl cellulose film on polyvinyl alcohol film double-sided laminate 60, under the tension of 600N 'not close to the roll The roller was passed through the ultraviolet light irradiated by the LH1〇-6〇Uv electrodeless lamp 1 of the ultraviolet lamp provided by the ultraviolet irradiation device 61 (fushion company) shown in Fig. 3 at a linear velocity of llm/min in the horizontal direction. Polymerization hardening. At this time, the total amount of ultraviolet light was 119 (mj/cm 2 ). Further, a polarizing plate was obtained in the same manner as in Example 1. The results are shown in Table 1. -13-200944848 [Comparative Example 2] The same procedure as in Comparative Example 1 was carried out except that the total amount of ultraviolet light was changed to 27 (mJ/cm2). The results are shown in Table 1. [Table 1] Example 1 Example 2 Comparative Example 1 Comparative Example 2 UV irradiation method Roller has a roll with a roll ίκ y» \\ Roller ^ττΤ m UV cumulative light amount (mJ/cm2) 110 143 119 27 wave Number (number) 0 0 17 11 Wavelength (mm) 0 0 67.65 104.55 Amplitude (mm) 1 0 0 13.25 4 2 0 0 13.5 4.75 3 0 0 12.75 5 4 0 0 12.5 6 5 0 0 14.25 4.25

如表1所示，比較例1及比較例2之偏光板均出現波 〇 浪型卷縮，比起比較例2，紫外線累積光量多的比較例1 之偏光板出現產生較強的波浪型卷縮。相較於此，實施例 1及實施例2得到之偏光板波數爲0，證明可抑制逆卷縮 及波浪型卷縮之產生。又，實施例1及實施例2將得到之 薄膜切取20cmx3〇Cm之長方形，設置於平板上，雖確定 有四角翹曲狀況（卷縮），而並未出現完全卷縮。 【圖式簡單說明】 -14- 200944848 [圖π代表本發明中該偏光板製造裝置之一實施形態 的槪略側面圖。 [圖2]代表（A)，（Β)於偏光板出現波浪型卷縮之評定 方法的槪略說明圖。 [圖3]代表於比較例1，2中經由活化能線之照射之黏 著劑聚合硬化方法的說明圖。 [圖4]代表於液晶盒層合1種偏光板之直線偏光薄膜 〇 之構造示例的說明圖。 [圖5]代表偏光板之構成爲示例的說明圖。 【主要元件符號說明】 1 〇 :液晶盒 11 :黏著劑層 12 :直線偏光薄膜 22 :保護薄膜 Ο 24 :黏著劑層 2 1 :偏光子 25 :黏著劑層 23 :保護薄膜 20 :偏光板 -15-As shown in Table 1, the polarizing plates of Comparative Example 1 and Comparative Example 2 all exhibited wave-wave type curling, and the polarizing plate of Comparative Example 1 having a large amount of accumulated ultraviolet light appeared to produce a stronger wave-shaped roll than Comparative Example 2. Shrink. In contrast, the wavenumber of the polarizing plate obtained in Example 1 and Example 2 was 0, which proved that the occurrence of reverse crimping and wave-type crimping can be suppressed. Further, in Example 1 and Example 2, the obtained film was cut into a rectangular shape of 20 cm x 3 cm, which was placed on a flat plate, and although it was confirmed that there was a four-corner warping condition (crimping), complete curling did not occur. BRIEF DESCRIPTION OF THE DRAWINGS [14] Fig. π represents a schematic side view of an embodiment of the polarizing plate manufacturing apparatus of the present invention. [Fig. 2] A schematic diagram showing the evaluation method of the wave-type crimping of the polarizing plate on behalf of (A), (Β). Fig. 3 is an explanatory view showing an adhesive polymerization hardening method by irradiation of an activation energy line in Comparative Examples 1 and 2. Fig. 4 is an explanatory view showing a configuration example of a linear polarizing film 〇 which is a liquid crystal cell in which one type of polarizing plate is laminated. FIG. 5 is an explanatory diagram showing an example of a configuration of a polarizing plate. [Main component symbol description] 1 〇: liquid crystal cell 11: adhesive layer 12: linear polarizing film 22: protective film Ο 24: adhesive layer 2 1 : polarizer 25: adhesive layer 23: protective film 20: polarizing plate - 15-

Claims (1)

200944848 十、申請專利範圍 1·一種偏光板的製造方法，其爲偏光子之單面或雙面 分別層合黏著保護薄膜之偏光板的製造方法，其特徵係介 由黏著劑使該偏光子與保護薄膜重疊後，得到層合體，接 著沿著該層合體之長邊方向，使該層合體密合於形成圓弧 . 狀之凸彎面，同時使該黏著劑進行聚合硬化。 2.如申請專利範圍第1項之偏光板的製造方法，其中 該凸彎面爲滾輥的外圍面。 Q 3·如申請專利範圍第1項或第2項之偏光板的製造方 法’其中該偏光子爲經單軸延伸之碘或雙色性染料被吸附 定向之聚乙烯醇薄膜’該保護薄膜的一方爲非晶性聚烯烴 樹脂薄膜，另一方爲三乙醯纖維素薄膜。 4. 如申請專利範圍第1項之偏光板的製造方法，其中 對密合於該凸彎面之層合體照射活化能線後，進行聚合硬 化。 5. —種偏光板的製造裝置，其爲一種具備：於保護薄 ❹ 膜的單面或偏光子之雙面上塗佈黏著劑之步驟，與介由黏 著劑層於偏光子之單面或雙面上重叠保護薄膜之步驟，以 及爲使黏著劑進行聚合硬化之步驟之偏光板的製造裝置， 爲使該黏著劑進行聚合硬化之步驟，係含有使重疊保護薄 膜之偏光子密合於外圍面，同時進行搬運之滾輥，與往該 滾輥之外圍面照射活化能線之活化能線照射裝置。 6. 如申請專利範圍第5項之偏光板的製造裝置，其中 該活化能線照射裝置爲紫外線照射裝置。 -16-200944848 X. Patent Application No. 1. A method for manufacturing a polarizing plate, which is a method for manufacturing a polarizing plate in which a protective film is laminated on one side or both sides of a polarizer, characterized in that the polarizer is caused by an adhesive After the protective films are overlapped, a laminate is obtained, and then the laminate is adhered to a convex curved surface which is formed into a circular arc shape along the longitudinal direction of the laminate, and the adhesive is subjected to polymerization hardening. 2. The method of producing a polarizing plate according to claim 1, wherein the convex curved surface is a peripheral surface of the roller. Q3. The method for producing a polarizing plate according to claim 1 or 2, wherein the polarizer is a uniaxially stretched iodine or a dichroic dye adsorbed oriented by a polyvinyl alcohol film. It is an amorphous polyolefin resin film, and the other is a triacetyl cellulose film. 4. The method of producing a polarizing plate according to claim 1, wherein the laminate which is adhered to the convex curved surface is irradiated with an activation energy line, and then polymerized and hardened. A device for manufacturing a polarizing plate, comprising: a step of applying an adhesive on both sides of a protective thin film or a polarizer; and a single layer of the polarizer via the adhesive layer or a step of superposing a protective film on both sides, and a manufacturing apparatus of a polarizing plate for performing a step of polymerizing and curing the adhesive, wherein the step of polymerizing and curing the adhesive comprises adhering a polarizer of the overlapping protective film to the periphery The surface is simultaneously conveyed by the roll, and the activation energy line irradiation device that irradiates the activation energy line to the peripheral surface of the roll. 6. The apparatus for manufacturing a polarizing plate according to claim 5, wherein the activation energy ray irradiation device is an ultraviolet ray irradiation device. -16-
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