TW201247417A - A method of manufacturing a polarizer - Google Patents

A method of manufacturing a polarizer Download PDF

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Publication number
TW201247417A
TW201247417A TW101110231A TW101110231A TW201247417A TW 201247417 A TW201247417 A TW 201247417A TW 101110231 A TW101110231 A TW 101110231A TW 101110231 A TW101110231 A TW 101110231A TW 201247417 A TW201247417 A TW 201247417A
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TW
Taiwan
Prior art keywords
adhesive
thickness
film
optical film
measured
Prior art date
Application number
TW101110231A
Other languages
Chinese (zh)
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TWI535570B (en
Inventor
Hiroaki Takahata
Jun Furukawa
Azusa Hiroiwa
Hidemitsu Shimizu
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Sumitomo Chemical Co
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Publication of TW201247417A publication Critical patent/TW201247417A/en
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Publication of TWI535570B publication Critical patent/TWI535570B/en

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00634—Production of filters
    • B29D11/00644—Production of filters polarizing
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • 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
    • 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

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Health & Medical Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Ophthalmology & Optometry (AREA)
  • Mechanical Engineering (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)

Abstract

A method of manufacturing a polarizer (4) of this invention comprises the following steps (A) to (D). (A) Use coating machine that has the adhesive coating thickness control unit to coat adhesive on the optical film (2) made of thermoplastic resin. The refractive index of optical film (2) is in the range of 1.4 to 1.7. The difference in refractive index between the adhesive and the optical film (2) is more than 0.03. (B) Use interferometric spectrometer-type film thickness gauge (15) to measure the coated adhesive thickness with the spectrometric wavelength ranges set below 800 nm by the interferometric-spectrometer method. (C) Overlap the adhesive coated surface of the optical film (2) onto the polarizing film (1) made of polyvinyl alcohol series resin, and press the optical film (2) against the polarizing film (1) by the clamp rolls (20), (21) to allow the polarizing film (1) and the optical film (2) to be bonded through the adhesive. (D) Proceed control to the control mechanism according to the measured thickness (X) of the adhesive and the preset thickness (Y) of the adhesive.

Description

201247417 六、發明說明： 【發明所屬之技術領域】 本發明係關於一種作為液晶顯示構件所使用之偏光板之 製造方法。 【先前技術】 構成液晶顯示裝置之核心之液晶面板通常係藉由於液晶 單元之兩面配置偏光板而構成。一般來說，偏光板為如下 構造.於聚乙婦醇系樹脂製之偏光膜之一面，經由黏接劑 而貼合有透明樹脂製之保護膜。大多於偏光膜之另一面， 亦經由黏接劑貼合透明樹脂膜，就這一側之透明樹脂膜而 言’除具有與相反側之保護膜同樣地僅對偏光膜之保護功 能之保護膜以外’亦具有所謂相位差膜，其除保護功能以 外’亦出於液晶單元之光學補償與視場角補償之目的，賦 予面内及/或厚度方向之相位差。於本說明書中，將此種 於偏光膜上經由黏接劑所貼合之保護膜與相位差膜等稱為 「光學膜」。用於向偏光膜貼合光學膜所使用之黏接劑一 般為液狀’藉由該液狀黏接劑之硬化反應，於偏光膜與光 學膜之間顯現黏接力。 近年來’以電視為首之液晶顯示裝置之價格急劇降低， 對構成其之構件低價格化之要求日趨強烈，另一方面，對 質之要求亦進一步增強。於這一潮流之中，偏光板之製 k所使用之黏接劑’亦自能夠適用之光學膜之種類限於纖 維素系樹脂等特定之樹脂之水系黏接劑，而向能夠適用之 光學膜之種類豐富之活性能量線硬化型黏接劑變更。使用 163198.doc 201247417 了活性能量線硬化型黏接劑之偏光膜與光學膜之貼合，例 如於曰本專利特開2004-245925號公報中提出。 就活性能量線硬化型黏接劑而言，被以液狀準備，且使 用於被塗佈物上直接塗佈該液狀黏接劑之模壓塗佈機、或 於表面所形成之凹槽中擔載液狀黏接劑並將其轉印到被塗 佈物表面之凹版輥，被於光學膜之向偏光膜之貼合面上預 先塗覆。然後，於該黏接劑塗覆面上重疊偏光膜，照射紫 外線與電子束等之活性能量線，而使黏接劑硬化，從而體 現黏接力。使用這樣之活性能量線硬化型黏接劑之方式， 能夠適用之光學膜多，是非常有效之方法。 作為這種使用活性能量線硬化型黏接劑之偏光板之製造 方法’例如’於日本專利特開2009-134190號公報中揭示 有以下方法：於偏光膜之兩面分別經由黏接劑而使保護膜 重合’得到積層體’一邊於沿著該積層體之搬運方向以圓 弧狀所形成之凸曲面之外表面使該積層體密接，一邊照射 活性能量線。根據該方法，能夠抵制於所得到之偏光板上 容易發生之反捲與波浪捲曲，可製造具有良好之性能之偏 光板。 於此文獻之方法中，於保護膜上所形成之黏接劑層之厚 度，對於所製造之偏光板之反捲與波浪捲曲不會造成巨大 之影響，因此認為管理黏接劑之塗覆厚度之必要性不大。 但是，由於黏接劑層之厚度偏差，雖然大半為未造成問題 之水平，但亦會產生氣泡等之缺陷，該缺陷大時，會使偏 光板之成品率降低》此外，廉價而穩定地製造更高性能之 163198.doc 201247417 偏光板時，活性能量線硬化型黏接劑大多會比現有之水系 黏接劑厚地塗覆，另外，由於其本身高價，以及偏光板本 身亦期望薄壁化，因此，期望將其厚度管理為，將偏差 (變動）幅度考慮於内之最低限度之厚度。 為了塗覆厚度以在線方式即於偏光板於製造線上之黏接 劑之塗佈後、於偏光膜與光學膜之貼合前得以測量管理， 作為測量其厚度之儀器，已知有紅外線膜厚計。然而，紅 外線膜庠計因為於分辨率上存在界限，因此，如偏光板製 造線這樣於被連續地搬運之薄膜上以數μιη左右所形成之 塗覆層（黏接劑層）之厚度要得以準確測量就存在困難。若 具體進行說明，則於偏光板製造線中，如後述之圖1所 示，偏光膜及其至少一面所貼合光學膜，各自沒有特殊之 支承體而被連續地搬運，且於某處被貼合。於如此連續被 搬運之薄膜上’於厚度方向與受到張力之方向（流動方向） 產生微妙之搖擺（振動），若於有這種搖擺之狀態下，藉由 紅外線膜厚計測量塗覆層之厚度，則只能夠得到±1 μπι& 右之精度，以此為基礎來管理塗覆厚度，事實上不可能。 另外，若光學膜上所形成之黏接劑層.之厚度由紅外線膜厚 計測量’則光學膜提供之紅外線吸收波峰與黏接劑提供之 紅外線吸收波峰必須被明確地區別，儘管有這樣之限制， 但亦存在由於光學膜之種類導致兩者之波峰重疊，從而得 不到測量值本身之情況。因此至今為止，於使用液狀黏接 劑之偏光板之製造中’還無法對於薄膜上所塗佈之液狀黏 接劑之厚度進行在線檢查。 163198.doc 201247417 【發明内容】 [發明所欲解決之問題] 因此，本發明之課題在於提供一種偏光板之製造方法， 其於偏光膜上經由以活性能量線硬化型黏接劑為代表例之 液狀黏接劑而貼合光學膜時，藉由對黏接劑之塗覆厚度進 行在線管理，而使其厚度之偏差減少，由此不僅抑制黏接 劑層中之氣泡等缺陷之發生，並且可廉價地製造偏光板。 [解決問題之技術手段] 本發明者等人為了解決上述課題而進行了積極研究，結 果發現：於將液狀之黏接劑塗覆於光學膜上，使該塗覆層 與偏光膜貼合來製造偏光板時，藉由所塗覆之黏接劑之厚 度由特定之方法計測’而可準確求得其厚度，基於此結果 控制塗覆時之黏接劑之塗佈厚度’由此可製造黏接劑之厚 度均一、且缺陷少之偏光板，從而完成了本發明。 即’本發明提供一種偏光板之製造方法，其係於聚乙稀 醇系樹脂製之偏光膜上經由黏接劑，將於2(rc下由D線所 測量之折射率處於1.4〜1.7之範圍之、熱可塑性樹脂製之光 學膜貼合’從而製造偏光板，上述黏接劑於2〇<>(：下由D線 所測量之折射率、與構成光學膜之熱可塑性樹脂於相同條 件下所測量之折射率相差0·03以上，並且具備以下之（A)、 (B)、（C)及（D)各步驟。 (A)塗覆步驟，其使用具有黏接劑之塗佈厚度控制機構 之塗佈機，於光學膜之向偏光膜之貼合面上塗佈上述黏接 劑； 163198.doc -6 - 201247417 (B) 计測步驟，其藉由分光波長範圍於go。以下之範 圍内之分光干涉法，對所塗佈之黏接劑之厚度進行在線 測； 、" (C) 貼合步驟，其於由上述塗覆步驟所塗佈之黏接劑面 上將偏光膜重疊並加壓； (D) 控制步驟，其基於在〇 5〜5 μιη之範圍内所設定之黏 接劑之设定厚度γ與於計測步驟中所得到之黏接劑之計測 厚度X，對黏接劑之塗佈厚度控制機構進行控制。 本發明之偏光板之製造方法，較佳為具有下述（D)之步 驟。 (D)當上述計測步驟中所得到之黏接劑之計測厚度χ與上 述γ之差之絕對值相對於在0 5〜5 μηι之範圍内所設定之黏 接劑之設定厚度γ之比例為特定值以上時，例如為5%以上 時’對上述塗佈厚度控制機構進行控制。 另外，本發明之其他態樣之方法係提供具有以下之 (A)、（Β)、（C)及（D)之各步驟之偏光板之製造方法。 (Α)於熱可塑性樹脂製之光學膜上，使用具有黏接劑之 塗佈厚度之控制部之塗佈機來塗佈黏接劑，於2(rc下由d 線所測量之光學膜之折射率處於1>4〜17之範圍，於⑽它下 由D線所測量之黏接劑之折射率、與於2〇。〇下由d線所測 量之光學膜之折射率相差〇.〇3以上； (B) 藉由为光波長範圍設定於8〇〇 nm以下之範圍内之分 光干涉法，對所塗佈之黏接劑之厚度進行計測； (C) 於光學膜之黏接劑塗佈面重疊聚乙烯醇系樹脂製之 163198.doc 201247417 偏光膜，將光學膜相對於偏光膜加壓，而使偏光膜與光學 膜經由黏接劑貼合； ⑼基於在〇.5〜5 μηι之範圍内所設定之黏接劑之設定厚 度Υ與黏接劑之計測厚度χ，對控制部加以控制。 本發明之其他態樣之方法，較佳為具有下述（D) 驟》 (D)當上述黏接劑之計測厚度χ與黏接劑之設定厚度γ之 差之絕對值相對於在〇·5〜5 μιη之範圍内所設定之黏接劑之 設定厚度Υ之比例為特定值以上時，例如為5%以上時，對 控制部加以控制。 [發明之效果] 根據本發明，於偏光膜上經由黏接劑貼合光學膜時該黏 接劑與光學膜具有特定之折射率差之前提下，可將光學膜 上所形成之黏接劑之厚度進行在線瞬間計測，並將其結果 傳達至塗佈機具有之對黏接劑之塗佈厚度進行控制之機 構，以控制其塗佈厚度，由此可製造黏接劑之厚度均一之 偏光板。其結果，能夠抑制因黏接劑之厚度偏差而易於產 生之氣泡等缺陷。 【實施方式】 於本實施形態中，於聚乙烯醇系樹脂製之偏光膜上，經 由黏接劑貼合熱可塑性樹脂製之光學膜，製造偏光板。光 學膜了僅貼合於偏光膜之單面、亦可貼合於偏光膜之兩 面°其次，對光學膜與黏接劑具有特定之折射率差之光學 膜與黏接劑之組合，能夠應用本實施形態之方法。於偏光 163198.doc 201247417 膜之兩面貼合光學獏時，可於一方之光學膜之貼合中應用 本實施形態之方法，亦可於兩方之光學膜之貼合中應用本 發明之方法。 [偏光膜] 偏光膜為聚乙烯醇系樹脂製，是具有如下性質之膜， 即，使入射至該膜之光之中之、具有某一方向之振動面之 光透過且將具有與其直交之振動面之光吸收，具代表性者 係於聚乙烯醇系樹脂上吸附定向二色性色素。構成偏光骐 之聚乙烯醇系樹脂係藉由使聚乙酸乙烯酯系樹脂皂化而獲 知。作為聚乙烯醇系樹脂之原料之聚乙酸乙烯酯系樹脂’ 除可為作為乙酸乙烯酯之均聚物之聚乙酸乙烯酯以外，亦 可為乙酸乙烯酯與可與其共聚合之其他單體之共聚物。對 於此種聚乙烯醇系樹脂製之膜，藉由實施單軸延伸、以二 色性色素進行之染色、與染色後之硼酸交聯處理，可製造 偏光膜。作為二色性色素’使用峨與二色性之有機染料。 單軸延伸可於利用二色性色素進行染色之前進行，亦可與 利用二色性色素進行之染色同時進行，還可於利用二色性 色素進行染色之後，例如於硼酸交聯處理中進行。如此製 造，並吸附定向有二色性色素之聚乙烯醇系樹脂製之偏光 膜，成為偏光板之原料之一。 [光學膜] 於此種偏光膜上，貼合於溫度20°C下由D線所測量之折 射率處於1.4~1.7之範圍之熱可塑性樹脂製之光學膜，而製 造偏光板。光學膜之折射率依據JIS K 0062 : 1992「化學 163198.doc -9· 201247417 製品之折射率測量方法」進行測量。若光學膜具有這一範 圍之折射率’則於所製造之偏光板被組裝到液晶面板時之 顯示特性優異。基於同樣之理由，光學膜較佳之折射率為 1ΜΜ.67之範圍。該光學膜，其^找值（霧度）處於 0.001〜3%左右之範圍，這使所得到之偏光板之對比度提 高，特別於組裝到液晶面板而進行黑色顯示時，產生亮度 降低等問題之可能性減少，因而較佳。Haze值係由（擴散 透過率/全光透過率）xl〇0(%)定義之值，依據JIS κ 7136 : 2000「塑膠-透明材料之Haze2求法」進行測量。 作為構成此種光學膜之熱可塑性樹脂，例如能夠列舉如 下，此處，將於溫度20。(：下由D線所測量之折射率作為卟 (20C)—併表示。 環烯烴系樹脂[nD(2(rc )=1.51〜1.54左右]、 結晶性聚烯烴系樹脂[nD(2〇eC )=1.46〜1.50左右]、 聚酯系樹脂[11〇(20°〇)=1.57〜1.66左右]、 聚碳酸酯系樹脂[nD(20°C )=1.57〜1.59左右]、 丙烯酸系樹脂[nD(20°C )=1.49〜1.51左右]、 三乙醯纖維素系樹脂[nD(20°C )=1.48前後]等。 環烯烴系樹脂係以諸如降葙烯般之環烯烴系單體為主要 之構成單元之聚合物，其中包括：將環烯烴系單體之開環 聚合物氫化而獲得之樹脂，環烯烴系單體與諸如乙烯或丙 烯般之碳數2〜10之鏈狀烯烴系單體及/或諸如苯乙烯般之 芳香族乙烯基單體之加成聚合物等。 結晶性聚烯烴系樹脂係以碳數2〜10之鏈狀烯烴系單體為 163198.doc •10· 201247417 主要之構成單70之聚合物，纟中包括：鏈狀烯烴系單體之 均聚物’使用兩種以上之鏈狀烯烴系單體之二元或三元以 上之共聚物。具體而言，包括聚乙烯系樹脂、丨丙烯系樹 月曰乙稀-丙稀共聚物、4_甲基小戊稀之均聚物、或心甲 基-1-戊稀與乙稀或丙烯之共聚物等。 聚醋系樹脂除了諸如聚對苯二子酸乙二醋與諸如聚萘二 甲酸乙一 Sa這樣之芳香族聚g旨系樹脂以外，亦包括脂肪族 聚醋系樹脂。聚碳酸㈣樹脂’具代表性者係藉由雙齡A 與光氣之反應而獲得之、主鏈上具有碳醆酯鍵_〇_c〇_〇·之 聚合物。丙烯酸系樹脂，具代表性者係以甲基丙烯酸曱酯 為主要構成單元之聚合物，除甲基丙烯酸甲酯之均聚物以 外，還包括甲基丙烯酸甲酯與其他曱基丙烯酸酯及/或丙 烯酸酯之共聚物等。三乙醯纖維素系樹脂為纖維素之乙酸 酯0 由該等熱可塑性樹脂，藉由溶液鑄膜法或熔融撥出法等 製成膜’能夠作為用於本實施形態之光學膜。另外，亦可 將製膜後再進行單軸或雙軸延伸之膜’作為用於本實施形 態之光學膜。於光學膜向偏光膜貼合之前，亦可先對其貼 合面’實施諸如皂化處理、電暈處理、電漿處理、底塗處 理或錨塗（anchor coating)處理般之易黏接處理。另外，亦 可於光學膜之與向偏光膜之貼合面相反側之面，設置諸如 硬敷層、防反射層或防眩層般之各種處理層。 光學膜較佳為通常具有5〜200 μιη左右之厚度。若光學膜 過薄，則欠缺處理性，於偏光板製造線中發生斷裂、或引 163198.doc • 11 - 201247417 起褶皺之發生之可能性變高。另一方面，若過厚，則所得 到之偏光板變厚，重量亦變大，因此損害商品性。基於該 等理由，更佳之厚度為l〇〜12〇 ，進而較佳為1〇〜85 μπι 〇 [黏接劑] 於以上般之偏光膜上貼合光學膜時，，首先於光學膜之向 偏光膜之貼合面塗佈黏接劑。就於此使用之黏接劑而言， 於溫度2(TC下由D線所測量之折射率，需要與上述之構成 光學膜之熱可塑性樹脂於同條件下所測量之折射率、換言 之於溫度20°C下由D線所測量之光學膜之折射率，相差 〇.〇3以上。若兩者之折射率差小，則藉由後述之分光干涉 法線上測量該黏接劑厚度變得因難β再者於本說明書中， 就折射率而言，全部係以於溫度20〇c下由D線所測量之為 前提，因此，以下若未特別聲明則「折射率」均意味著於 該條件下所測量之值》 黏接劑之厚度係設定於0.5〜5 μηι之範圍之特定值。若其 厚度低於0.5 μηι，則有黏接強度產生不均之情況。另一方 面，若其厚度超過5 μηι，則不僅製造成本增大，而且由於 黏接劑之種類亦會影響到偏光板之色調。如果於該範圍内 比較厚，例如3.5 μηι以上，特別是如果於4 以上，則即 使其厚度有一些變動，亦難以出現由其引起之氣泡等之缺 陷，但另一方面，如此加厚容易帶來成本之增加，因此較 佳為於可能之範圍使之薄。基於該等理由，黏接劑較佳為 厚度為1〜4 μιη，更佳為1.5〜3·5 μιη之範圍。 163198.doc •12· 201247417 只要黏接劑讀狀之可塗佈可之狀態供給，料 前之偏光板之製造中所使用之各種之 候性與聚合性等之觀點，較佳為陽離子聚合性之：:氣 例如環氧化合物，更具體而 如日本專利特開2004-45925號公報所記載般之、以分子内不具有芳香環之環氧 化合物作為活性能量線硬化性成分之—而含有之活性能量 線硬化型黏接劑。此種環氧化合物，例如可為如下等：對 於以雙W之二縮水甘油_為代表例之、作為芳香族環氧 化合物之原料之芳香族多羥基化合物進行核氫化，使其縮 水甘油醚化而獲得之氫化環氧化合物；分子内至少具有】 個鍵結於脂肪族環上之環氧基的脂環式環氧化合物/以脂 肪族多羥基化合物之縮水甘油醚為代表例之脂肪族環氧化 合物’且該等通常是M2Gt)吐49左右。另外，於活性能 量線硬化型黏接劑中，除了以環氧化合物為代表例之陽^ 子聚合性化合物之外，通常還會調配聚合起始劑，特別是 調配用於藉由活性能量線之照射而使陽離子活性種 (cationic species)或路易士酸發生、而引發陽離子聚合性 化合物之聚合之陽離子光聚合起始劑。此外，亦可調配藉 由加熱引發聚合之陽離子熱聚合起始劑，另外亦可調配光 敏劑等各種添加劑。然後，使之與塗覆之光學膜之折射率 差為0.03以上而調製黏接劑。 於偏光膜之兩面貼合光學臈時，各個光學獏所適用之黏 接劑可相同’亦可不同，但基於生產率之觀點，於能夠得 到適度之黏接力這一前提下，較佳為兩面均為相同之黏接 163198.doc •13. 201247417 劑。 [偏光板之製造方法] 於本實施形態中’於以上說明之聚乙烯醇系樹脂製之偏 光膜上’經由黏接劑貼合光學膜’來製造偏光板。此時， 歷經以下之（A)、（B)、（C)及（D)之各步驟。 (A) 使用具有黏接劑之塗佈厚度控制機構之塗佈機，於 光學膜之向偏光膜之貼合面塗佈黏接劑之塗覆步驟； (B) 藉由分光波長範圍為80〇 nm以下之範圍内之分光干 涉法’對所塗佈之黏接劑之厚度進行在線計測之計測步 驟； (C) 於經上述塗覆步驟塗佈之黏接劑面上重疊偏光膜並 加壓之貼合步驟；與 (D) 當上述計測步驟中得到之黏接劑之計測厚度X與上述 Y之差之絕對值相對於在0.5〜5 μιη2範圍内所設定之黏接 劑之設定厚度Υ之比例為特定值以上時，控制上述塗佈厚 度控制機構之控制步驟。 圖1係概略地表示適用於本發明之製造裝置之配置例之 側面圖，圖2係表示本發明之各步驟間之關係之一例之方 塊圖。以下，一邊參照該等圖，一邊對於偏光板之製造方 法進行詳細地說明。 圖1所不之製造裝置構成為，一邊連績地搬運偏光膜^， 一邊於其一面貼合第一光學膜2、且於另一面貼合第二光 學膜3，製造偏光板4,並捲取到捲取輥3〇上。如該圓所 示，典型而言係於偏光膜1之兩面分別貼合光學膜，但僅 163198.doc •14- 201247417 於偏光膜1之一面貼合光學膜之形態亦包含於本實施形熊 中。該情形時之形態係自以下之說明中除去關於另一光學 膜之說明，由此，只要為本領域技術人員，則可容易地理 解至可實施之程度。 於第一光學膜2之向偏光膜丨所貼合之面，由第_塗佈機 1〇塗佈黏接劑後，藉由第一分光干涉式膜厚計15 ,計測所 塗佈之黏接劑之厚度’另一方面’於第二光學臈3之向偏 光膜1所貼合之面，亦由第二塗伟機12塗佈黏接劑後，藉 由第二分光干涉式膜厚計16，計測所塗佈之黏接劑之厚 度。黏接劑被塗佈、且其厚度得到計測之後之第一光學膜 2與第二光學膜3,各自之黏接劑塗佈面被重合到偏光臈1 之兩面，由貼合用夾輥2〇、21夾住並於厚度方向上加壓， 其次接受來自活性能量線照射裝置18之活性能量線之照射 而使黏接劑硬化後，經由捲取前夾輥22、23，使所得到之 偏光板4被捲取到捲取輥上。 於第一塗佈機10與第二塗佈機12中，由各自所設之凹版 輥11、13 ’於第-與第二光學膜2、3上塗佈黏接劑。於偏 光膜1之一面、與第一光學膜2及第二光學膜3之分別塗佈 有黏接劑之面相反側之面，適宜設置搬運用之導向輥24。 如上述般，僅於偏光膜丨之一面貼合光學膜時，只適用於 圖1所示之第一光學膜2及第二光學膜3中之一者（例如，僅 適用第一光學膜2)即可。圖中之直線箭頭係指膜之流動方 向’曲線箭頭係指輥之旋轉方向。 就偏光臈1而s，大多係於未圖示之偏光膜製造步驟中 163198.doc -15, 201247417 對聚乙稀醇系樹脂膜經過單轴延伸、利用二色性色素進行 之染色及染色後之删酸交聯處理而製造成後，直接、、即^ 不捲取到報上之狀態被供給，當然，於偏光膜製造步驟令 製造之膜被暫時捲取到輥上之後，再自抽出機抽出即可。 另一方面，第-光學膜2與第二光學膜3自分別未圖示之轉 藉由抽出機而抽出。各個膜分別以相同之生產線速度，例 如10〜50 m/分鐘左右之生產線速度，以流動方向相同之方 式被搬運。第一光學膜2與第二光學膜3,於流動方向上— 邊施加例如50〜1000 N/m左右之張力一邊被抽出。 然後，由第一塗佈機10與第二塗佈機12，進行上述之塗 覆步驟（A)，由第一分光干涉式臈厚計15與第二分光干涉 式膜厚計16，進行上述之計測步驟（B),由貼合用失輥 20、21，進行上述之貼合步驟（c)，將分光干涉式膜厚計 15、16之計測結果返回到塗佈機1〇、12，由此進行上述之 控制步驟（D)。塗佈機1〇、丨2具有之凹版輥u、13係具有 凹槽之輥，於此凹槽中預先填充有黏接劑，藉由以此狀態 使之於光學膜2、3上旋轉，從而將黏接劑轉印到光學膜 2、3上。藉由調整其旋轉速度’能夠控制向光學膜2、3上 之黏接劑之供給量，進而控制塗佈厚度。於此情形時，凹 版輥、特別是凹版輥之旋轉速度之調整機構，成為控制塗 佈機10、12之塗佈厚度之機構（塗佈厚度控制機構或塗佈 厚度之控制部）。 根據圖2之方塊圖說明該等各步驟之關係之一例。首 先’藉由設定（0) ’關於在上述塗覆步驟中塗佈之黏接 163198.doc •16- 201247417 劑之厚度，預先於05〜5 μιη之範圍内進行設定厚度γ之設 定二=定厚度γ基於上述之理由，較佳設定為卜4 ，更 叱為1,5〜3.5 μιη。然後，設定控制塗佈機1〇、12之塗 佈厚度之機構之初始條件，使塗覆步驟（Α)起動。於計測 步驟⑻中，計測由塗覆步驟⑷塗佈之黏接劑之厚度，並 作為計測厚度X輸出。不論該計測厚度χ如何塗佈有黏 接劑之光學膜2、3均於貼合步驟（c)中，經由各自之黏接 劑塗佈面被貼合於偏光膜i之兩面。另一方面於控制步 驟（D)中’該計測厚度χ與上述之設定厚度丫進行對比。然 後，例如，計測厚度χ與設定厚度γ之差之絕對值相對於 设定厚度Υ而言於特定之閾值以上、例如為5〇/。以上時，塗 佈機10、12之塗佈厚度控制機構起動，使兩者之差作為絕 對值變小而控制塗佈厚度，較佳為如下方式 厚度X與設定厚度γ之差之解料伯+ 便冲利 差之絕對值，相對於設定厚度Υ而未 達特疋之閾值，例如夫这：. 達。。此處，計測厚度X與設定厚 度Υ之差之絕對值相對於設 ^ .疋厚度丫為5/0以上，這意味著 滿足下式⑴’於圖2中，按照根據是否滿足該式來決定是 否變更控制機構之條件之方式加以顯示。再者，本實= 態之汁測厚度X與設定厚度γ之對比 說明中之上述之方法。s〇 1 个限疋為圖2之 . 卩，计測厚度X與設定厚度γ之對 比’亦可不基於計測厘 於絕對值。例如，可根據設定厚^之差’亦可不基 了根據叶測厚度X與設定厚度 對於設定厚度Y之比例為特定之間值以下、還是為= 閾值以上，例如是A w 祀疋馮特疋之 疋為-5/。以下或是為+5%以上而進行對 163198.doc 17 201247417 比；亦可根據計測厚度X對設定厚度γ之比例為特定之聞 值以下還是為特定之閾值以上，例如為95% 上而進行對比。上述間值並不限定為5%(或·；％、9二 等）而可為更低之值，例如1 %或3。/。，亦可為更高之閾 值’例如7%或1〇%。另外’上側之閾值與下側之閾值亦可 採用不同之值（例如_3%以下或7〇/。以上）。 [數式1]201247417 VI. Description of the Invention: The present invention relates to a method of manufacturing a polarizing plate used as a liquid crystal display member. [Prior Art] A liquid crystal panel constituting a core of a liquid crystal display device is usually constituted by disposing a polarizing plate on both surfaces of a liquid crystal cell. In general, the polarizing plate has a structure in which a protective film made of a transparent resin is bonded to one surface of a polarizing film made of a polyethylene glycol-based resin via an adhesive. The transparent resin film is bonded to the other side of the polarizing film, and the transparent resin film on the side is a protective film which has a protective function only for the polarizing film except for the protective film on the opposite side. In addition, there is also a so-called retardation film which, in addition to the protection function, also imparts a phase difference in the in-plane and/or thickness direction for the purpose of optical compensation of the liquid crystal cell and compensation of the viewing angle. In the present specification, the protective film and the retardation film which are bonded to the polarizing film via the adhesive are referred to as "optical films". The adhesive used for bonding the optical film to the polarizing film is generally liquid. The curing reaction between the polarizing film and the optical film is exhibited by the hardening reaction of the liquid adhesive. In recent years, the price of liquid crystal display devices led by television has been drastically reduced, and the demand for lowering the cost of the components constituting them has become stronger. On the other hand, the demand for quality has been further enhanced. In this trend, the type of optical film used in the production of polarizing plates is also limited to the water-based adhesives of specific resins such as cellulose resins, and is applicable to optical films that can be applied. A wide variety of active energy line hardening adhesives are modified. The use of a polarizing film of an active energy ray-curable adhesive and an optical film is disclosed in Japanese Laid-Open Patent Publication No. 2004-245925. The active energy ray-curable adhesive is prepared in a liquid form, and is applied to a coating coater directly coated with the liquid adhesive on the coated object, or in a groove formed on the surface. The gravure roll carrying the liquid adhesive and transferring it to the surface of the object to be coated is pre-coated on the bonding surface of the optical film to the polarizing film. Then, a polarizing film is superposed on the adhesive-coated surface to irradiate the active energy rays such as the ultraviolet rays and the electron beam, and the adhesive is hardened to exhibit the adhesive force. The use of such an active energy ray-curable adhesive means that many optical films can be applied, which is a very effective method. As a method of producing such a polarizing plate using an active energy ray-curable adhesive, for example, Japanese Patent Laid-Open Publication No. 2009-134190 discloses a method of protecting a surface of a polarizing film via an adhesive. The film is superimposed to obtain a laminated body, and the active energy ray is irradiated while the laminated body is adhered to the outer surface of the convex curved surface formed in an arc shape along the conveying direction of the laminated body. According to this method, it is possible to resist the rewinding and wave curl which are likely to occur on the obtained polarizing plate, and it is possible to manufacture a polarizing plate having good performance. In the method of this document, the thickness of the adhesive layer formed on the protective film does not have a great influence on the rewinding and wave curl of the manufactured polarizing plate, and therefore it is considered that the coating thickness of the adhesive is managed. The necessity is not great. However, since the thickness of the adhesive layer varies, most of the defects are not problematic, but defects such as bubbles are generated. When the defect is large, the yield of the polarizing plate is lowered. In addition, it is inexpensive and stable. In the case of a higher-performance 163198.doc 201247417 polarizing plate, the active energy ray-curing adhesive is mostly coated thicker than the existing water-based adhesive, and because of its high price and the thinning of the polarizing plate itself, Therefore, it is desirable to manage the thickness so that the deviation (variation) amplitude is taken into consideration within the minimum thickness. In order to coat the thickness in an in-line manner, that is, after the application of the polarizing agent on the manufacturing line, and before the bonding of the polarizing film and the optical film, as an instrument for measuring the thickness thereof, an infrared film thickness is known. meter. However, since the infrared film enthalpy has a limit in resolution, the thickness of the coating layer (adhesive layer) formed on the continuously conveyed film such as a polarizing plate manufacturing line by a few μηη can be obtained. There are difficulties in accurate measurement. Specifically, in the polarizing plate manufacturing line, as shown in FIG. 1 to be described later, the polarizing film and at least one surface thereof are bonded to the optical film, and each of them is continuously conveyed without a special support, and is placed somewhere. fit. On such a continuously conveyed film, a subtle sway (vibration) is generated in the direction of the thickness direction and the direction of the tension (flow direction), and if the sway is present, the coating layer is measured by an infrared film thickness meter. Thickness, only the accuracy of ±1 μπι& right can be obtained, based on which the coating thickness is managed, which is virtually impossible. In addition, if the thickness of the adhesive layer formed on the optical film is measured by the infrared film thickness meter, the infrared absorption peak provided by the optical film and the infrared absorption peak provided by the adhesive must be clearly distinguished, although there is such a Restriction, but there are also cases where the peaks of the two are overlapped due to the type of the optical film, so that the measured value itself cannot be obtained. Therefore, it has hitherto been impossible to perform on-line inspection of the thickness of the liquid adhesive applied on the film in the manufacture of a polarizing plate using a liquid adhesive. 163198.doc 201247417 [Problem to be Solved by the Invention] Therefore, an object of the present invention is to provide a method for producing a polarizing plate which is represented by an active energy ray-curable adhesive on a polarizing film. When the optical film is bonded to the liquid film, the thickness of the adhesive is reduced by the on-line management of the thickness of the adhesive, thereby suppressing not only the occurrence of defects such as bubbles in the adhesive layer. And the polarizing plate can be manufactured inexpensively. [Means for Solving the Problem] The present inventors have conducted active research to solve the above problems, and as a result, found that a liquid adhesive is applied to an optical film to bond the coating layer to the polarizing film. When the polarizing plate is manufactured, the thickness of the applied adhesive is measured by a specific method, and the thickness can be accurately determined, and based on the result, the coating thickness of the adhesive at the time of coating can be controlled. The present invention has been completed by producing a polarizing plate having a uniform thickness of the adhesive and having few defects. That is, the present invention provides a method for producing a polarizing plate which is based on a polarizing film made of a polyethylene glycol resin and which has a refractive index of 1.4 to 1.7 measured by a D line at 2 rc. A polarizing plate is produced by bonding an optical film made of a thermoplastic resin to the polarizing plate, and the above-mentioned adhesive is at a refractive index measured by the D line and a thermoplastic resin constituting the optical film. The refractive indices measured under the same conditions differ by more than 0·03, and have the following steps (A), (B), (C), and (D). (A) Coating step using an adhesive Coating the thickness control mechanism to apply the adhesive to the bonding surface of the optical film to the polarizing film; 163198.doc -6 - 201247417 (B) measuring step, which is performed by the wavelength range of the wavelength Go. The spectroscopic interference method in the following range, the thickness of the applied adhesive is measured online; and " (C) the bonding step, which is applied to the adhesive surface coated by the above coating step The polarizing film is superposed and pressurized; (D) a control step which is set based on a range of 〜5 to 5 μηη The set thickness γ of the adhesive and the measured thickness X of the adhesive obtained in the measuring step are controlled by the coating thickness control mechanism of the adhesive. The method for producing the polarizing plate of the present invention preferably has The following step (D): (D) the absolute value of the difference between the measured thickness χ of the adhesive obtained in the above measuring step and the above γ with respect to the bonding set in the range of 0 5 to 5 μηι When the ratio of the set thickness γ of the agent is a specific value or more, for example, when the ratio is 5% or more, the coating thickness control means is controlled. Further, the method of the other aspect of the present invention provides the following (A), ( A method of producing a polarizing plate for each step of Β), (C), and (D). (Α) using a coating machine having a coating portion having a coating thickness of an adhesive on an optical film made of a thermoplastic resin. Applying the adhesive, the refractive index of the optical film measured by the d line at 2 (rc) is in the range of 1 > 4 to 17, and the refractive index of the adhesive measured by the D line under (10) 2〇. The refractive index of the optical film measured by the d-line is different from 〇3〇; (B) by A spectroscopic interference method in which the wavelength range of light is set to be less than 8 〇〇 nm, and the thickness of the applied adhesive is measured; (C) the polyvinyl alcohol-based resin is superposed on the coated surface of the optical film. 163198.doc 201247417 Polarizing film, pressurizing the optical film relative to the polarizing film, and bonding the polarizing film and the optical film via the adhesive; (9) Based on the bonding set in the range of 〇.5~5 μηι The thickness of the agent and the thickness of the adhesive are measured, and the control portion is controlled. The other aspect of the method of the present invention preferably has the following (D) (D) when the above-mentioned adhesive is measured When the ratio of the absolute value of the difference between the thickness χ and the set thickness γ of the adhesive is set to a specific value or more with respect to the set thickness Υ of the adhesive set in the range of 〇 5 to 5 μηη, for example, 5% or more At the time, the control unit is controlled. [Effects of the Invention] According to the present invention, when the optical film is bonded to the polarizing film via the adhesive, the adhesive and the optical film have a specific refractive index difference, and the adhesive formed on the optical film can be removed. The thickness is measured on-line instantaneously, and the result is transmitted to a mechanism that the coating machine controls the coating thickness of the adhesive to control the coating thickness, thereby making the thickness of the adhesive uniformly polarized. board. As a result, it is possible to suppress defects such as bubbles which are easily generated due to variations in the thickness of the adhesive. [Embodiment] In the present embodiment, a polarizing plate is produced by laminating an optical film made of a thermoplastic resin to a polarizing film made of a polyvinyl alcohol-based resin via an adhesive. The optical film can be applied only to one side of the polarizing film or to both sides of the polarizing film. Secondly, a combination of an optical film and an adhesive having a specific refractive index difference between the optical film and the adhesive can be applied. The method of this embodiment. When the optical iridium is bonded to both surfaces of the film, the method of the present embodiment can be applied to the bonding of one of the optical films, and the method of the present invention can be applied to the bonding of the two optical films. [Polarizing film] The polarizing film is made of a polyvinyl alcohol-based resin and is a film having a property of transmitting a vibration surface having a certain direction among the light incident on the film and having a direct relationship thereto. The light absorption of the vibrating surface is representative of the adsorption of the dichroic dye on the polyvinyl alcohol resin. The polyvinyl alcohol-based resin constituting the polarized fluorene is known by saponifying a polyvinyl acetate-based resin. The polyvinyl acetate-based resin which is a raw material of the polyvinyl alcohol-based resin may be a polyvinyl acetate which is a homopolymer of vinyl acetate, or may be a vinyl acetate and other monomers copolymerizable therewith. Copolymer. The film made of such a polyvinyl alcohol-based resin can be produced by uniaxially stretching, dyeing with a dichroic dye, and crosslinking treatment with boric acid after dyeing. As the dichroic dye, an organic dye of hydrazine and dichroic is used. The uniaxial stretching can be carried out before dyeing with a dichroic dye, simultaneously with dyeing with a dichroic dye, or after dyeing with a dichroic dye, for example, in a boric acid cross-linking treatment. The polarizing film made of a polyvinyl alcohol-based resin having a dichroic dye is adsorbed in this manner, and becomes one of the raw materials of the polarizing plate. [Optical film] On such a polarizing film, a polarizing plate was produced by laminating an optical film made of a thermoplastic resin having a refractive index measured by a D line at a temperature of 20 ° C in the range of 1.4 to 1.7. The refractive index of the optical film is measured in accordance with JIS K 0062: 1992 "Chemical 163198.doc -9·201247417 Product Refractive Index Measurement Method". If the optical film has a refractive index of this range, the display characteristics are excellent when the polarizing plate to be manufactured is assembled to a liquid crystal panel. For the same reason, the optical film preferably has a refractive index of 1 ΜΜ.67. In the optical film, the value (haze) is in the range of about 0.001 to 3%, which improves the contrast of the obtained polarizing plate, and particularly causes problems such as a decrease in brightness when black display is incorporated in the liquid crystal panel. The possibility is reduced and thus better. The Haze value is a value defined by (diffusion transmittance / total light transmittance) xl 〇 0 (%), and is measured in accordance with JIS κ 7136: 2000 "Haze 2 method for plastic-transparent material". Examples of the thermoplastic resin constituting such an optical film include the following, and here, the temperature is 20. (: The refractive index measured by the D line is represented by 卟 (20C) - Cycloolefin resin [nD (2 (rc ) = 1.51 to 1.54 or so], crystalline polyolefin resin [nD (2〇eC) ) = 1.46 to 1.50 or so, polyester resin [11 〇 (20 ° 〇) = 1.57 to 1.66 or so], polycarbonate resin [nD (20 ° C) = 1.57 to 1.59 or so], acrylic resin [ nD (20 ° C) = 1.49 to 1.51], triacetyl cellulose resin [nD (20 ° C) = 1.48 before and after], etc. The cycloolefin resin is a cycloolefin monomer such as norbornene. The polymer which is a main constituent unit, which comprises a resin obtained by hydrogenating a ring-opening polymer of a cycloolefin monomer, a cycloolefin monomer and a chain olefin having a carbon number of 2 to 10 such as ethylene or propylene An addition polymer of a monomer and/or an aromatic vinyl monomer such as styrene, etc. The crystalline polyolefin resin is a chain olefin monomer having a carbon number of 2 to 10 163198.doc • 10 · 201247417 Mainly composed of a polymer of the composition 70, which includes: a homopolymer of a chain olefin-based monomer. A binary or ternary or higher using two or more chain olefin-based monomers. a copolymer comprising, in particular, a polyethylene resin, a propylene-propylene styrene-propylene copolymer, a 4-methyl pentane homopolymer, or a cardiomethyl-1-pentane A copolymer of ethylene or propylene, etc. The polyester resin includes an aliphatic polyacetal resin in addition to an aromatic polyg-type resin such as polyethylene terephthalate and an aromatic polyethylene glycol such as polyethylene naphthalate. Polycarbonate (tetra) resin is a polymer obtained by the reaction of two ages A with phosgene and having a carbon oxime bond _ 〇 _c 〇 〇 on the main chain. Acrylic resin Representative of the polymer is methacrylate methacrylate as the main building block, in addition to the homopolymer of methyl methacrylate, also includes the copolymerization of methyl methacrylate with other methacrylate and / or acrylate The triacetonitrile cellulose resin is cellulose acetate 0. From these thermoplastic resins, a film is formed by a solution casting method or a melt dialing method, etc., which can be used as the optical body for the present embodiment. Membrane. Alternatively, the film may be uniaxially or biaxially stretched after film formation. The optical film used in the present embodiment may be subjected to a saponification treatment, a corona treatment, a plasma treatment, a primer treatment or an anchor coating before the optical film is bonded to the polarizing film. In addition, a treatment layer such as a hard coat layer, an antireflection layer or an antiglare layer may be provided on the surface opposite to the bonding surface of the optical film to the polarizing film. The optical film preferably has a thickness of about 5 to 200 μm. If the optical film is too thin, there is a lack of handleability, and breakage occurs in the polarizing plate manufacturing line, or the occurrence of wrinkles may occur in the 163198.doc • 11 - 201247417 Sex becomes higher. On the other hand, if it is too thick, the obtained polarizing plate becomes thick and the weight also becomes large, so that the commercial property is impaired. For these reasons, the thickness is preferably from 10 〇 to 12 〇, and further preferably from 1 〇 to 85 μπι 〇 [adhesive] when the optical film is bonded to the above polarizing film, first in the direction of the optical film. The bonding surface of the polarizing film is coated with an adhesive. For the adhesive used herein, the refractive index measured by the D line at temperature 2 (TC) requires the refractive index measured under the same conditions as the thermoplastic resin constituting the optical film described above, in other words, temperature. The refractive index of the optical film measured by the D line at 20 ° C differs by 〇 〇 3 or more. If the refractive index difference between the two is small, the thickness of the adhesive becomes measured by the spectroscopic interferometry method described later. In the present specification, in terms of refractive index, all of them are based on the measurement of the D line at a temperature of 20 〇 c. Therefore, unless otherwise stated, "refractive index" means The value measured under the conditions" The thickness of the adhesive is set to a specific value in the range of 0.5 to 5 μηι. If the thickness is less than 0.5 μηι, there is a case where the bonding strength is uneven. When the thickness exceeds 5 μm, not only the manufacturing cost increases, but also the type of the adhesive affects the color tone of the polarizing plate. If it is thicker in this range, for example, 3.5 μηι or more, especially if it is 4 or more, even if There are some changes in its thickness. It is difficult to cause defects such as bubbles caused by it, but on the other hand, such thickening is likely to bring about an increase in cost, and therefore it is preferable to make it thin in a possible range. For these reasons, the adhesive is preferably thick. It is a range of 1 to 4 μm, more preferably 1.5 to 3·5 μm. 163198.doc •12· 201247417 As long as the adhesive can be applied in a state where it can be coated, it is used in the manufacture of a polarizing plate before the material. From the viewpoints of various kinds of properties and polymerizability, it is preferably a cationically polymerizable one: a gas such as an epoxy compound, and more specifically, as described in Japanese Laid-Open Patent Publication No. 2004-45925, which does not have a molecule. An active energy ray-curable adhesive containing an epoxy compound of an aromatic ring as an active energy ray-curable component. Such an epoxy compound may, for example, be as follows: for a double W diglycol _ For example, an aromatic polyhydroxy compound which is a raw material of an aromatic epoxy compound is subjected to nuclear hydrogenation to obtain a hydrogenated epoxy compound obtained by etherification of glycidol; at least one of the molecules is bonded to an aliphatic ring. Alicyclic epoxy compound of the epoxy group / glycidyl ether of polyhydric aliphatic compound is an aliphatic epoxy compound of Example representatives' and such typically M2Gt) about 49 spit. In addition, in the active energy ray-curable adhesive, in addition to the cationic compound which is represented by an epoxy compound, a polymerization initiator is usually formulated, and in particular, it is formulated for use by an active energy ray. A cationic photopolymerization initiator which generates a cationically active species or a Lewis acid by irradiation to initiate polymerization of a cationically polymerizable compound. Further, a cationic thermal polymerization initiator which initiates polymerization by heating may be blended, and various additives such as a photo-sensitizer may be formulated. Then, the difference between the refractive index of the coated optical film and the coated optical film was 0.03 or more to prepare the adhesive. When the optical iridium is attached to both sides of the polarizing film, the adhesives suitable for each optical yoke may be the same 'may be different, but based on the viewpoint of productivity, it is preferable to have both sides on the premise that a moderate adhesive force can be obtained. For the same bonding 163198.doc • 13. 201247417 agent. [Manufacturing Method of Polarizing Plate] In the present embodiment, the polarizing plate is produced by attaching an optical film to an optical film made of a polyvinyl alcohol-based resin described above via an adhesive. At this time, the following steps (A), (B), (C), and (D) are performed. (A) a coating step of applying an adhesive to the bonding surface of the optical film to the polarizing film using a coating machine having a coating thickness control mechanism of an adhesive; (B) by a wavelength range of 80 Spectroscopic interference method within the range of 〇nm or less 'measurement step for on-line measurement of the thickness of the applied adhesive; (C) overlaying the polarizing film on the surface of the adhesive coated by the above coating step and adding Pressing step of pressing; and (D) the absolute value of the difference between the measured thickness X of the adhesive obtained in the above measuring step and the above Y with respect to the set thickness of the adhesive set in the range of 0.5 to 5 μm 2 When the ratio of bismuth is more than a certain value, the control step of the coating thickness control mechanism is controlled. Fig. 1 is a side view schematically showing an arrangement example of a manufacturing apparatus to which the present invention is applied, and Fig. 2 is a block diagram showing an example of the relationship between the steps of the present invention. Hereinafter, the method of manufacturing the polarizing plate will be described in detail with reference to the drawings. In the manufacturing apparatus of the first embodiment, the polarizing film is conveyed in a continuous manner, and the first optical film 2 is bonded to one surface thereof, and the second optical film 3 is bonded to the other surface, and the polarizing plate 4 is produced and wound. Take the take-up roll 3〇. As shown by the circle, the optical film is typically attached to both sides of the polarizing film 1, but only 163198.doc •14-201247417 is attached to the optical film on one side of the polarizing film 1 and is also included in the present embodiment. in. The form in this case is removed from the description below with respect to another optical film, and thus, as long as it is a person skilled in the art, it can be easily solved to an extent that it can be implemented. On the surface of the first optical film 2 to which the polarizing film 贴 is bonded, after the adhesive is applied by the first coating machine 1 , the applied viscous film 15 is used to measure the applied viscosity. The thickness of the bonding agent is 'on the other hand', the surface of the second optical yoke 3 to which the polarizing film 1 is attached, and the second coating device 12 is coated with the adhesive, and the second spectral interference film thickness is applied. Count 16, measuring the thickness of the applied adhesive. The first optical film 2 and the second optical film 3 after the adhesive is applied and the thickness thereof is measured, and the respective adhesive application surfaces are superposed on both sides of the polarizing 臈1, and the nip roller 2 for bonding The crucibles 21 are clamped and pressed in the thickness direction, and then the active energy rays from the active energy ray irradiation device 18 are irradiated to harden the adhesive, and then the nip rollers 22 and 23 are taken up by the winding. The polarizing plate 4 is taken up onto a take-up roll. In the first coater 10 and the second coater 12, an adhesive is applied to the first and second optical films 2, 3 from the respective gravure rolls 11, 13'. The guide roller 24 for conveyance is suitably provided on the surface of the polarizing film 1 on the side opposite to the surface on which the first optical film 2 and the second optical film 3 are coated with the adhesive. As described above, when only one surface of the polarizing film is bonded to the optical film, it is only applicable to one of the first optical film 2 and the second optical film 3 shown in FIG. 1 (for example, only the first optical film 2 is applied) ) Just fine. The straight arrow in the figure refers to the flow direction of the film. The curved arrow refers to the direction of rotation of the roller. The polarizing 臈1 and s are mostly in the manufacturing process of the polarizing film (not shown) 163198.doc -15, 201247417 After the uniaxial stretching of the polyethylene glycol-based resin film, dyeing and dyeing with the dichroic dye After the acid-cut cross-linking treatment is carried out, it is supplied directly, that is, in a state where it is not taken up to the newspaper. Of course, after the film to be produced is temporarily taken up onto the roll in the manufacturing process of the polarizing film, it is self-extracted. The machine can be taken out. On the other hand, the first optical film 2 and the second optical film 3 are taken out by means of an extractor from a respective unillustrated transfer. Each film is conveyed at the same line speed, for example, a line speed of about 10 to 50 m/min, in the same flow direction. The first optical film 2 and the second optical film 3 are extracted while applying a tension of, for example, about 50 to 1000 N/m in the flow direction. Then, the coating step (A) described above is performed by the first coater 10 and the second coater 12, and the first splitting interference thickness gauge 15 and the second splitting interference thickness gauge 16 are used to perform the above-described steps. In the measuring step (B), the bonding step (c) is performed by the bonding failure rollers 20 and 21, and the measurement results of the spectral interference film thickness gauges 15 and 16 are returned to the coating machines 1 and 12, The above control step (D) is thus carried out. The gravure rolls u and 13 of the coater 1 and 丨2 are rolls having grooves, and the grooves are pre-filled with an adhesive, and the film is rotated on the optical films 2 and 3 in this state. Thereby, the adhesive is transferred onto the optical films 2, 3. By adjusting the rotational speed ', the amount of the adhesive to the optical films 2, 3 can be controlled, and the coating thickness can be controlled. In this case, the adjustment mechanism of the rotational speed of the gravure roll, particularly the gravure roll, serves as a mechanism for controlling the coating thickness of the applicators 10 and 12 (coating thickness control means or control portion for coating thickness). An example of the relationship between the steps will be described based on the block diagram of FIG. First, by setting (0) 'the thickness of the adhesive 163198.doc •16-201247417 applied in the above coating step, set the thickness γ in the range of 05~5 μηη in advance. The thickness γ is preferably set to be 4 and more preferably 1,5 to 3.5 μm based on the above reasons. Then, the initial conditions of the mechanism for controlling the coating thickness of the coaters 1 and 12 are set to start the coating step (Α). In the measuring step (8), the thickness of the adhesive applied by the coating step (4) is measured and output as the measured thickness X. The optical films 2 and 3 coated with the adhesive regardless of the thickness measurement are bonded to both surfaces of the polarizing film i via the respective adhesive application surfaces in the bonding step (c). On the other hand, in the control step (D), the measured thickness χ is compared with the above-described set thickness 丫. Then, for example, the absolute value of the difference between the measured thickness χ and the set thickness γ is equal to or greater than a specific threshold value with respect to the set thickness 、, for example, 5 〇 /. In the above, the coating thickness control means of the coaters 10 and 12 are started, and the difference between the two is reduced as the absolute value to control the coating thickness. Preferably, the difference between the thickness X and the set thickness γ is as follows. + The absolute value of the spread difference, relative to the set thickness, but not the threshold of the special, such as the husband:. . Here, the absolute value of the difference between the measured thickness X and the set thickness Υ is set to 5/0 or more with respect to the thickness 丫, which means that the following formula (1)' is satisfied in FIG. 2, and it is determined according to whether or not the formula is satisfied. The manner in which the conditions of the control agency are changed is displayed. Furthermore, the actual thickness of the juice is measured in comparison with the set thickness γ. s 〇 1 limit is shown in Fig. 2. 卩, the ratio of the measured thickness X to the set thickness γ may not be based on the absolute value. For example, the difference between the thicknesses of the set thicknesses may be based on whether the ratio of the thickness X to the set thickness to the set thickness Y is below a specific value or above a threshold value, for example, A w 祀疋 冯特疋Then it is -5/. In the following, the ratio of 163198.doc 17 201247417 may be 5% or more; or the ratio of the measured thickness X to the set thickness γ may be below a specific threshold or a specific threshold or more, for example, 95%. Compared. The above-mentioned inter-value is not limited to 5% (or *, %, 9 or the like) but may be a lower value, for example, 1% or 3. /. It may also be a higher threshold 'e.g. 7% or 1%. Further, the threshold of the upper side and the threshold of the lower side may also have different values (for example, _3% or less or 7 〇/. or more). [Expression 1]

丨X-Y|xl00 Y >5 ⑴ 以下’對於構成本實施形態之方法之塗覆步驟、計 測步驟（B)、貼合步驟（C)及控制步驟（D)，按順序詳細地說 明。另外，因使用活性能量線硬化型黏接劑時，經過以上 之各步驟之後’實施硬化步驟（E)，故對於該步驟亦進行 說明。 (A)塗覆步驟 於塗覆步驟（A)中’於光學膜2、3之向偏光膜1之貼合面 塗佈黏接劑。此處使用之塗佈機，只要為具有塗佈厚度控 制機構者’則沒有特別限定’但具代表性者係使用參照圖 1而說明之凹版輥11、13之方式。於使用凹版輥之塗佈機 中，例如有：直接凹板塗佈機 '封閉式刮刀塗佈機、補償 凹板塗佈機、使用凹版輥之吻合式塗佈機、由複數個輥構 成之逆轉輥式塗佈機等。另外’亦能夠利用如下等各種塗 佈機：具有圓筒狀之刮板，一邊向塗佈部供給黏接劑並由 163198.doc • 18 · 201247417 J板到落 邊進行塗佈之刮刀式（comma)塗佈機；應用 狹縫模嘴等直接供給黏接劑之模嘴式塗佈機；形成貯液， 邊用刀片到落夕餘之液體一邊進行塗佈之刮刀塗佈機 等。其中，若考慮薄膜塗覆與轨跡線之自由度等，於使用 凹版輥之塗佈機之中，較佳為直接凹板塗佈機、封閉式刮 刀塗佈機、補償凹板塗佈機等，除凹版輥以外，亦較 佳為使用狹縫模嘴之模嘴式塗佈機。基於易於對應偏光板 之寬幅化及使由液體所供給之黏接劑之異味難以釋放出之 角度而言，更較佳為封閉式刮刀塗佈機。 此處’所謂封閉式刮刀塗佈機，係指使凹版輥抵接於吸 收有液狀之塗料（黏接劑）之封閉式到刀上，將封閉式到刀 中之塗料（黏接劑）移至凹版輥之凹槽中，再將其轉印至作 為被塗佈物之光學膜2、3上之這__方式之塗佈機。設計為 小型者’亦稱作微型封閉式到刀塗佈機。 .於使用凹版輥塗佈黏接劑時，黏接劑層之厚度能夠根據 凹版輥對於生產線速度之速度比進行調整。使光學膜2、3 之生產線速度為10〜50 m/分鐘，使凹版輥相對於光學膜 2、3之搬運方向逆向旋轉，使凹版輥之旋轉圓周速度為 10〜500 m/分鐘，從而能夠使黏接劑之塗佈厚度調整為 0.5〜5 μπι。此時之塗佈厚度，因為亦由於凹版輥表面之空 隙率而受到影響，因而，較佳為事前選擇具有適合於設定 厚度Υ之表面之空隙率之凹版輥。再者，相對於光學膜2、 3之搬運方向而使凹版輥逆向旋轉之方式，亦被稱為反向 凹印。 i63198.doc •19· 201247417 (B)計測步驟 ，於什測步驟（B)中，由上述之塗覆步驟（A)所塗佈之黏接 劑之厚度藉由分光干涉法得以在線計測。此處所謂分光干 涉法係根據以下之原理求得膜厚之方式。即，若向塗佈 有黏接劑之膜進行光照射，則產生來自黏接劑之表面之反 射光、與來自黏接劑/光學膜之界面之反射光，則該等兩 種反射光如果相位相同則互相增強、另外如果相位相反則 互相肖】弱，因此成為干涉光。於800 nm以下之範圍所包含 之波長域（例如自230至800 nm之波長域）對該干涉光進行 分光，藉由對所得到之分光波形圖進行傅襄葉變換而求得 光予膜厚，藉由考慮黏接劑之折射率而求得黏接劑之厚 度。黏接齊!之厚度藉由光學之膜厚之週期之計測而求 得，以例如〇.〇1〜1秒之計測間隔求得。該等操作多為如下 形式之操作’ g卩，於膜厚計之中自動地進行，將多次例如 10 10000次之測量值、或特定時間内例如5秒〜3分鐘内之 測量值加以平均’作料測值輸出。作為用於光照射之光 源，較佳為具有包含於800 以下之範圍内之波長域（例 如自230至800 nm之波長域）之光之光源，通常使用D2(氘） 燈、12(碘）燈、D2/I2燈等》 因.系射而產生之兩種反射光，係由於空氣與黏接劑之折 射率差、與黏接劑與光學膜之折射率差引起。黏接劑之折 射率通常大多處於1.4〜1.6之範圍，因此於與空氣（折射率=1) 之界面之反射光會順利地發生。另一方面，如果黏接劑與 光學膜之折射率差小 則於其界面之反射難以發生，不能 163198.doc 201247417 進行尚精度之計測。因此，光學膜與黏接劑之折射率差需 要為0.03以上，但其折射率差越大越佳，具體來說，較佳 為具有0.05以上之折射率差。另外，於由圖1所示之方式 進行搬運之各膜中，如「先前技術」一項中所述，於厚度 方向與受到張力之方向（流動方向）產生微小搖擺時，以上 述之分光干涉法為原理之膜厚計中，有使分辨率為丨〇 nm 級或更小級別者，因此，即使膜產生一定程度之搖擺，亦 能夠以不高於±0.1 μιη之精度計測設於該膜上之塗覆層（本 實施形態中為黏接劑層）之膜厚。當然，膜之搖擺小時， 則能夠以更高之精度計測塗覆層之膜厚。以此種分光干涉 法為原理之膜厚計，可自市場售賣品之中選擇適宜者’但 如上述基於提高計測精度之觀點，則較佳為選擇具有丨〜1〇 nm級之分辨率之分光干涉式膜厚計。 (C)貼合步驟 經過以上之塗覆步驟（A)與計測步驟（B)後，進行於光學 膜2、3各自之黏接劑塗佈面上，重疊偏光膜i並加壓之貼 合步驟（C)。於該步驟之加壓中，可使用公知之方法，基 於可邊連續搬運一邊加壓之觀點，如圖1所示，較佳為 由-對夾輥20、21夹住之方式。於此情形時，較理想的是 使光學膜2、3重合於偏光膜i上之時序與由一對夾輥“、 21對光學臈2、3相對於偏光膜1加壓之時序相同，即使不 同兩者於時序選擇上之差異亦越短越佳。一對失輥2〇、 〇為如下任意一種均可：金屬輥/金屬耗、金屬輥/ 橡膠親橡膠親/橡膠較等。#壓時之壓力，較佳為以由 163198.doc -21 · 201247417 一對夹輕20、21夾住時之線壓力計為150〜500 N/cm左右。 (D)控制步驟 本實施形態中，設有控制步驟（D)，其基於以上說明之 計測步驟（B)之結果’控制塗覆步驟（A)中之黏接劑之塗佈 厚度之步驟°即’於塗覆步驟（A)中所塗佈之黏接劑之厚 度’隨著黏接劑之溫度與周圍環境溫度、及光學膜2、3之 表面張力及其受到之張力等，會發生一些變動，伴隨而來 的是與希望之塗佈厚度（設定厚度γ)之偏差，為了修正此 種塗佈厚度之偏移，以於計測步驟（B)中利用分光干涉法 計測之塗佈厚度（計測厚度X)為基礎，控制塗佈機具有之 塗佈厚度控制機構。具體而言，於計測厚度X比設定厚度 Y大時’以減小塗佈厚度之方式控制塗佈厚度控制機構； 於st測厚度X比設定厚度γ小時，以增大塗佈厚度之方式 控制塗佈厚度控制機構。 例如，如果塗佈機為模嘴式塗佈機，則於計測厚度X比 設定厚度Y大時’使泵等向模嘴送液之能力降低，反之， 於什測厚度X比設定厚度Y小時，提高向模嘴送液之能 力’由此可控制塗佈厚度。另外，於塗佈機為使用凹版輥 之封閉式刮刀塗佈機之情形時’於計測厚度X比設定厚度 Y大時’使反向凹印之轉速增大而提高旋轉圓周速度，以 減少黏接劑之轉印量；反之，於計測厚度X比設定厚度γ 小時’使反向凹印之轉速減小而降低旋轉圓周速度，以增 多黏接劑之轉印量’由此能夠控制塗佈厚度。膜厚控制之 程度，經驗性地根據當時之環境因素、黏接劑之黏度、光 163198.doc •22- 201247417 學膜之表面形狀等任意地設定。基於計測厚度χ與設定厚 度γ之實際之塗佈厚度控制機構之控制，可使用電腦進 行，亦可手動進行。 (Ε)硬化步驟 如上，於偏光膜丨上貼合光學膜2、3後，如果黏接劑為 活性能量線硬化型，則藉由活性能量線之照射使該黏接劑 硬化，經過此硬化步驟（Ε)製造偏光板4»於圖丨所示之例 子中，該硬化步驟（Ε)，藉由對於在偏光膜丨上貼合有光學 膜2、3之積層體，由活性能量線照射裝置18照射活性能量 線來進行。於該步財，㈣使難能量線硬化型黏接劑 硬化所需之能量係隔著光學膜2照射。作為活性能量線， 具體來說使用電子束或紫外線，根據黏接劑之硬化反應機 構而選擇。電子束照射裝置’由於有避免發生之電子束洩 漏到外部而有進行遮蔽之必要性，故裝置之尺寸與重量變 大m紫外線照射裝置因具有比較小型之構造， 故較佳為使用由紫外線照射進行之硬化。 於圖1所示之例子中，經由黏接劑而向偏光膜】與光學膜 2、3貼合之積層體照射活性能量線，係在位於照射裝置η 之前後之貼合用炎輥20、21與捲取前夾輥22、23之間於向 積層體施加張力之狀態下進行。但並不限於此，例如日本 專利特開2_·134刚號公報所揭示之、較佳為以被沿著 搬運方向形成為㈣狀之凸曲面、具代表性而言被概之外 周面支承之狀態下，進行活性能量線照射。特別於於活性 能量線之照射導致熱量發生、而使對製品造成不 163198.doc •23· 201247417 β 存在時，較佳為如後者般，以積層體被輥之外周面 支承之狀態對其進行活性能量線照射，此時，支承積層體 之輥較佳為知夠於i 〇〜6Q〇c左右之範圍進行溫度調節。 另卜'舌丨生能量線照射裝置，可於照射部位僅設置i個， 但沿著積層體之流動方向設置2個以上，形成來自複數個 光源之照射，於有效地提高累積光量方面有效。 於照射紫外線使黏接劑硬化時，使用之紫外線光源沒有 特別限定，能夠使用於波長400 nm以下具有發光分佈之例 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、微波激發水銀燈、金屬鹵化物燈 等。使用以環氧化合物為活性能量線硬化性成分之黏接劑 時’若考慮一般性之聚合起始劑顯示之吸收波長，則作為 紫外線光源’較佳為使用大量具有nm以下之光之高壓 水銀燈或金屬齒化物燈β 對於以環氧化合物為硬化性成分之黏接劑照射紫外線而 使之硬化時，積層體之生產線速度沒有特別限定，一般來 說’大體上原樣維持塗覆步驟（Α)與貼合步驟中之生產 線速度。另外’較佳為一邊於積層體之縱長方向（搬運方 向）上施加100〜1000 N/m之張力，一邊使對於聚合起始劑 之活性化有效之波長區域之照射量以累積光量（照射到積 層體之總能量）計，為1〇〇〜1500 mj/cm2 ^若向黏接劑照射 之累積光量（積算光量）過少，則活性能量線硬化型黏接劑 之硬化反應不足，難以體現充分之黏接強度，另一方面， 若該累積光量過大，則自光源輻射之熱與黏接劑聚合時所 163198.doc •24· 201247417 發生之熱量’有可能引起活性能量線硬化型黏接劑黃變與 偏光膜之劣化》 另外’若由1次紫外線照射達成需要之累積光量，則亦 會由於發熱致使膜處於超過15〇。(：之高溫，於此情形時， 有可能引起偏光膜之劣化等於避免此種事態方面，如上 述’有效的是沿著膜之搬運方向設置複數個紫外線照射裝 置’並分數次進行照射。 作為目標’有如下較佳為之情形：來自1處之紫外線照 射裝置之照射量’以累積光量計為6〇〇 mJ/cm2以下，最終 能夠得到上述之1〇〇〜15〇〇 mj/cm2之累積光量。 由以上方式製造之偏光板，黏接劑之厚度被控制於設定 之範圍内’構成偏光板之膜間之黏接強度之偏差小，黏接 劑層-之氣泡缺陷等亦少，作為製品之品質穩定性亦優異。 再者，本實施形態之方法之前提為，用於偏光膜1與光 學膜2或3之貼合之黏接劑之折射率，與構成光學膜2或3之 熱可塑性樹脂之折射率相差0.03以上。因此，於偏光膜之 兩面分別貼合光學膜2、3時，如果用於將第一光學膜2貼 合於偏光膜1上之黏接劑與第一光學膜2之折射率差為〇〇3 以上，用於將第二光學膜3貼合於偏光膜丨上之黏接劑與第 一光學膜3之折射率差為〇_〇3以上，則對於分別於偏光膜i 之兩面所形成之黏接劑而言，均能夠適用本實施形態之方 法。當然於此情形時，亦可僅對於在偏光膜丨之一面所貼 合之光學膜2或3與黏接劑之組合，適用本實施形態之方 法但疋’如果用於將第一光學膜2貼合於偏光膜1上之黏 163198.doc •25- 201247417 接劑與第一光學膜2之折射率差、及用於將第二光學膜3貼 合於偏光膜1上之黏接劑與第二光學膜3之折射率差均未達 0.03，則製造此種組合之偏光板時，不能適用本實施形態 之方法* 另外，於一側之光學膜與黏接劑之折射率差滿足以上之 關係、而另一側之光學膜與黏接劑之折射率差不滿足以上 之關係（低未達0.03)之情形時，對於與黏接劑之折射率差 為0.03以上之光學膜應用側之黏接劑之塗佈厚度，適用本 實施形態之方法，可製造偏光板。例如，如果用於將第一 光學膜2貼合於偏光膜丨上之黏接劑與第一光學膜2之折射 率差為0.03以上，用於將第二光學膜3貼合於偏光膜 黏接劑與第一光學膜3之折射率差未達〇_〇3，則對於用於 將第一光學膜2貼合於偏光膜丨上之黏接劑之塗佈厚度，適 用本實施形態之方法，可製造偏光板。於此情形時，對於 折射率差於0.03以上之第一光學膜與黏接劑之組合而言， 黏接劑之厚度亦得到均一化，亦可製造缺陷少之偏光板。 此外如後述之實施例所示，對於折射率差未達之第二 光學膜3與黏接劑之組合來說，由於達到了事實上黏接劑 厚度不會發生缺陷之程度，故亦可製造於偏光膜丨之兩面 而缺陷均得到大幅降低之偏光板。 [實施例] 以下表示實施例與比較例’更具體地說明本發明，但本 發明不受該等示例限定。再者，以下所示之實驗，係為了 確認本發明之效果而進行，例如，附註了如下内容：於夾 163198.doc •26· 201247417 著偏光膜、且與厚度被測量之黏接劑之相反側所塗佈之黏 接劑之厚度’以使其不會發生缺陷之方式，設定得比於實 際操作中所採用之最佳值厚一些。另外於以下之例子中， 折射率全部係於溫度20°C下由D線所測量之值。 圖3係概略性地表示於以下之實施例與比較例中使用之 裝置之配置之側面圖。 圖3所示之配置，與先前說明之圖1相比，僅以下兩點不 同’於差異點以外之部位附加與圖1相同之符號，因此該 等部位之詳細說明參照圖1之說明。 圖3相對於圖1之差異點： (1) 對在偏光膜1之兩面分別貼合了第一光學膜2與第二 光學膜3之後之積層體照射活性能量線（紫外線）時，一邊使 該積層體之第二光學膜3側與照射用捲繞輥26之外周面密 接’一邊自夾住該積層體且於捲繞輥26之相反側所配置之 活性能量線（紫外線）照射裝置18，向積層體之第一光學膜2 側照射紫外線；及 (2) 因僅有一台分光干涉式膜厚計，故第一光學膜2上所 塗佈之黏接劑之厚度由第一分光干涉式臈厚計15計測，而 第二光學膜3上所塗佈之黏接劑之厚度不計測。 又’作為分光干涉式膜厚計15，使用大塚電子（股）製之 反射分光膜厚計「FE-2900CCD」。該分光干涉式膜厚計係 藉由前面說明之分光干涉法測量膜厚者，光源為D2/I2燈， 其分光波長範圍是230〜800 nm，分辨率為1.3 nm0然後， 每隔預先設定之計測間隔，對被測量物之膜厚進行計測， I63198.doc -27· 201247417 冋樣於每個預先設定 ^ . ^ Ri „ 4 _ ’總計以上計測之各個膜厚 值輸出該時間内之平 内所彳畧ί,Ι #々^ 並且，於預先设定之時間 門所得到之各個膜里佶 , 中，將判定為異常值之資料自動 地除去而輸出平均膜厚。 [實施例1] (〇)用於實驗之材料 於該例中，作為第一光學膜2，使用厚度為60 μιη ’寬度 為133G職，由輥供給之環烤烴系樹脂製之雙轴定向性相 位差膜「ZE0N0Rj [自日本2刪（股）獲取，折射率 ，作為第二光學膜3，使用厚度8〇叫寬_， 仍由輥供給之三乙醯纖維素膜「KC8UX2mw」[自 K〇nicamin〇Ua(股）獲取，折射率148]。偏光膜丨與第一光 學膜2之黏接所使用之黏接劑，與偏光膜丨與第二光學膜3 之黏接所使用之黏接劑’均含有環氧化合物與光聚合起始 劑，為實質上不含溶劑之環氧系光硬化型黏接劑，其折射 率為1.49。 (A)塗覆步驟 將聚乙烯醇中吸附定向有碘之厚度25 μπι之偏光膜1、作 為第一光學膜2之上述環烯烴系樹脂膜、及作為第二光學 臈3之上述三乙醯纖維素膜，分別以i5 m/分鐘之生產線速 度，以流動方向相同之方式進行供給。於上述環烯烴系樹 脂膜2之向偏光膜1所貼合之面，使用具備凹版輥^之第一 塗佈機10[富士機械（股）製之「微型封閉式刮刀」]，塗佈 上述之環氧系光硬化型黏接劑。又，於上述三乙醯纖維素 163198.doc •28· 201247417 臈3之向偏光膜1所貼合之面’使用具備凹版輥13之第二塗 佈機12[同為富士機械（股）製之「微型封閉式刮刀」]，亦 塗佈上述之環氧系光硬化型黏接劑。 使设於塗佈機10、12之凹版輥11、13相對於膜之搬運方 向逆向旋轉。然後，三乙醯纖維素膜3側之第二塗佈機12 中，其设定方式為，使其具備之凹版輥13之旋轉圓周速度 為15 m/分鐘，於膜上以大約4 5 μιη之厚度塗佈黏接劑。這 疋由於不什測由第二塗佈機12塗佈之黏接劑之厚度，因此 不進行該膜厚控制，為此大致以不會出現缺陷之厚度塗佈 黏接劑。另一方面，於環烯烴系樹脂膜2側，使第一塗佈 機10具備之凹版輥11之旋轉圓周速度初始設定為2丨分 鐘，以大約2·ό μιη之厚度塗佈黏接劑。 (Β)計測步驟 利用於第一塗佈機10之下游側所配置之分光干涉式膜厚 計15 ’自環烯烴系樹脂膜2之黏接劑塗覆面側，以〇.5秒之 計測間隔測量塗佈厚度1分鐘（120次），使該1分鐘之平均值 作為計測厚度X依次輸出。然後設置後述之控制步驟（D)， 一邊控制該計測厚度X —邊進行150分鐘操作，求得於該 150分鐘内所取得之計測厚度χ(資料數15〇)之平均值與標 準偏差，將結果於表1中示出。 (C)貼合步驟 將塗佈有黏接劑之環烯烴系樹脂膜2及三乙醯纖維素膜 3，其各自之黏接劑塗佈面與偏光膜1重合，利用貼合用失 輥20、21以240 N/cm之線壓力將該等失住。通過炎親2〇、 163198.doc -29- 201247417 21之後之環烯烴系樹脂膜2/偏光膜1/三乙醯纖維素膜3之積 層體’使其三乙醯纖維素膜3側與設定為20°C之照射用捲 繞輥26之外周面密接，如此於縱長方向上施加6〇〇 N/m之 張力’以與貼合前相同之生產線速度丨5 m/分鐘，一邊向 該環烯烴系樹脂膜2側照射來自紫外線照射裝置18之紫外 線一邊進行搬運。紫外線照射裝置18為（股）GS Yuasa製， 自其具備之作為紫外線燈之「EHAN1700NAL高壓水銀 燈」2盞燈照射紫外線。就紫外線之累積光量而言，2盞燈 一共為330 mJ/cm2。如此使黏接劑層硬化，而製造於偏光 膜1之一面貼合有環烯烴系樹脂膜2而於另一面貼合有三乙 酿纖維素膜3之偏光板4，且捲取到捲取輥30上。 (D)控制步驟 於控制步驟中，其控制成’於以上之計測步驟中求得之 汁測厚度X與設定厚度γ=2.6 μιη相比而偏離5。/。以上之情形 時，即I Χ-Υ | 20.13 μιη之情形時，一邊使設置於第一塗 佈機10之凹版輥11之旋轉圓周速度以〇 5m/分鐘之單位進 行增減’ 一邊使黏接劑之塗佈厚度接近於設定厚度Y。 [比較例1 ] 於比較例1中，不設置實施例1中之控制步驟（D)，即， 即使於計測步驟（B)中得到之計測厚度χ發生變化亦不改 變第一塗佈機10具備之凹版輥u之旋轉速度，製造積層 體’繼，續同樣&進行紫外線照射而製作偏光板1操作了 150分鐘時之計測厚度χ之平均值與標準偏差於表1中示 出。 163198.doc -30- 201247417 [實施例2] 替代實施例1中環烯烴系樹脂製之雙軸定向性相位差膜 「ZEONOR」，使用厚度為38 μπι、寬度為1330 mm之雙轴 延伸聚對本一甲酸乙二g旨膜[自三菱樹脂（股）獲取，折射率 1.60]作為第一光學膜2;另外，替代三乙醯纖維素膜 「KC8UX 2MW」，使用於實施例1中作為第一光學獏2之環 稀烴系樹脂製之雙軸定向性相位差膜「ZEONOR」作為第 二光學膜3 ’其他均與實施例丨同樣而製作偏光板。將操作 了 150分鐘時之計測厚度χ之平均值與標準偏差於表1中示 出。 [比較例2] 不設置實施例2之控制步驟（D)，即，即使於計測步驟 (Β)中得到之計測厚度X發生變化，亦不改變第一塗佈機1〇 具備之凹版輥11之旋轉速度，以製造積層體，繼續同樣地 進行紫外線照射而製作偏光板。操作了 15〇分鐘時之計測 厚度X之平均值與標準偏差於表丨中示出。 [比較例3] 替代實施例1中環烯烴系樹脂製之雙軸定向性相位差膜 「ZEONOR」’使用厚度40 μπι、寬133〇 mm之三乙醯纖維 素製之雙軸疋向性相位差膜「KC4FR-1」[自Konicaminolta (股）獲取，折射率1.48]作為第一光學膜2，其他與實施例1 同樣而製作偏光板。此時，因為作為第一光學膜2使用之 三乙醯纖維素膜之折射率接近於黏接劑之折射率，故於計 ’則步驟（B)中無法計測黏接劑之厚度，因此不能控制黏接 163l98.doc 201247417 劑之塗佈厚度。 [偏光板之缺陷評估試驗] 於以上之實施例與比較例中，以i 3 3 〇 mm之寬度取得之 偏光板之中’將兩端各自除去了寬4〇 mm之部分之申央之 寬1250 mm之部分作為有效寬度，於該有效寬度内，就跨 越流動方向3300 mm之長度之面（丨.25 mx3.3 m与4 m2)，對 於經目測觀察成為亮點之地方做標記，再以放大倍率1 〇〇 之放大鏡觀察該標記過之地方，確認是否為氣泡，之後， 如果是氣泡’則根據以下之要領求得其大小。即，如果觀 察到之氣泡為準橢圓形（包括圓）’則以最長之直徑作為氣 泡之大小；如果氣泡為線狀，則以該線之長度作為氣泡之 大小。然後，對大小為1 00 μιη以上之氣泡之數量進行計 數，其數量每1 m2少於0.3個時，即於觀察之4 m2之面積中 有0個或1個時，為「οκ」；其數量Si 〇12為〇 3個以上時， 即觀察之4 m2之面積中有2個以上時，為「NG」，將結果與 主要之變量一併歸納於表丨中。表中，位於光學膜一欄中 之「cop」係、指環稀煙系樹脂，「PET」係指聚對苯二甲酸 乙二酿’「TAC」係指三乙醯纖維素。再者”尤由放大鏡 觀察到之大小於1GG μϊη以上之氣泡而言，於以其納入之方 式將膜切割成40 mmx40 mm之尺寸而用顯微鏡進行觀察 時，均確認到上述氣泡處於介於偏光膜丨與第一光學膜2之 間之黏接劑層中。 163198.doc -32- 201247417 [表l]丨X-Y|xl00 Y >5 (1) Hereinafter, the coating step, the measuring step (B), the bonding step (C), and the controlling step (D) constituting the method of the present embodiment will be described in detail in order. Further, when the active energy ray-curing type adhesive is used, the curing step (E) is carried out after the above respective steps, and this step will also be described. (A) Coating step Adhesive is applied to the bonding surface of the optical films 2, 3 to the polarizing film 1 in the coating step (A). The coater used herein is not particularly limited as long as it has a coating thickness control mechanism, but a representative one uses the gravure rolls 11 and 13 described with reference to Fig. 1 . In the coater using the gravure roll, for example, a direct gravure coater 'closed blade coater, a compensation gravure coater, an applicator coater using a gravure roll, and a plurality of rolls are used. Reverse roll coater and the like. In addition, it is also possible to use various types of coaters such as a scraper having a cylindrical scraper and supplying a binder to the coating portion and applying the coating from the 163198.doc • 18 · 201247417 J plate to the falling edge ( A comma coating machine; a die coater that directly supplies an adhesive such as a slit die; and a blade coater that forms a liquid storage while applying a blade to the remaining liquid. Among them, in consideration of the degree of freedom of film coating and track lines, etc., among the coaters using the gravure roll, a direct gravure coater, a closed blade coater, and a compensation gravure coater are preferred. In addition to the gravure roll, a die coater using a slit die is also preferred. The closed blade coater is more preferable because it is easy to correspond to the widening of the polarizing plate and the point that the odor of the adhesive supplied from the liquid is hard to be released. Here, the so-called closed knife coater means that the gravure roll is abutted against the closed type of the liquid-absorbent paint (adhesive), and the closed-to-knife paint (adhesive) is moved. Into the groove of the gravure roll, it is transferred to the coater of the optical film 2, 3 which is the object to be coated. Designed as a small person's also known as a micro-closed to knife coater. When the adhesive is applied using a gravure roll, the thickness of the adhesive layer can be adjusted according to the speed ratio of the gravure roll to the line speed. The production line speed of the optical films 2, 3 is 10 to 50 m/min, and the gravure roll is reversely rotated with respect to the conveyance direction of the optical films 2, 3, so that the circumferential speed of the gravure roll is 10 to 500 m/min, thereby enabling The coating thickness of the adhesive is adjusted to 0.5 to 5 μm. The coating thickness at this time is also affected by the void ratio of the surface of the gravure roll. Therefore, it is preferable to select a gravure roll having a void ratio suitable for the surface of the set thickness 事 in advance. Further, the manner in which the gravure roll is reversely rotated with respect to the conveyance direction of the optical films 2, 3 is also referred to as reverse gravure. I63198.doc •19·201247417 (B) Measurement procedure, in the measurement step (B), the thickness of the adhesive applied by the above coating step (A) is measured online by spectroscopic interference. Here, the spectroscopic interference method is a method of obtaining a film thickness based on the following principle. That is, when the film coated with the adhesive is irradiated with light, the reflected light from the surface of the adhesive and the reflected light from the interface between the adhesive/optical film are generated. When the phases are the same, they are mutually enhanced, and if the phases are opposite, they are mutually weak and therefore become interference light. The interference light is split in a wavelength range included in a range of 800 nm or less (for example, from a wavelength range of 230 to 800 nm), and the light film thickness is obtained by performing Fourier transform on the obtained splitting waveform diagram. The thickness of the adhesive is determined by considering the refractive index of the adhesive. The thickness of the bonding is determined by measuring the period of the film thickness of the optical film, and is obtained, for example, at a measurement interval of 1 to 1 second. These operations are mostly in the form of 'g卩, which is automatically performed in the film thickness meter, and averages the measured values of, for example, 10 10000 times, or the measured values within a specific time, for example, 5 seconds to 3 minutes. 'Material measurement output. As a light source for light irradiation, a light source having a wavelength range of 800 or less (for example, a wavelength range from 230 to 800 nm) is preferably used, and a D2 (氘) lamp, 12 (iodine) is usually used. Lamp, D2/I2 lamp, etc. The two kinds of reflected light generated by the system are caused by the difference in refractive index between the air and the adhesive and the difference in refractive index between the adhesive and the optical film. The refractive index of the adhesive is usually in the range of 1.4 to 1.6, so that the reflected light at the interface with air (refractive index = 1) occurs smoothly. On the other hand, if the difference in refractive index between the adhesive and the optical film is small, the reflection at the interface is difficult to occur, and the accuracy measurement cannot be performed 163198.doc 201247417. Therefore, the refractive index difference between the optical film and the adhesive needs to be 0.03 or more, but the larger the refractive index difference is, the more preferable, specifically, the refractive index difference of 0.05 or more. Further, in each of the films conveyed in the manner shown in Fig. 1, as described in the "Prior Art" section, when the thickness direction and the direction of the tension (flow direction) are slightly swayed, the above-described spectral interference is performed. In the film thickness meter based on the principle, the resolution is 丨〇nm level or less, so even if the film has a certain degree of sway, it can be measured on the film with an accuracy of not more than ±0.1 μηη. The film thickness of the upper coating layer (in the present embodiment, the adhesive layer). Of course, when the sway of the film is small, the film thickness of the coating layer can be measured with higher precision. A film thickness meter based on such a spectroscopic interference method can be selected from among commercially available products. However, as described above based on the improvement of measurement accuracy, it is preferable to select a resolution having a level of 丨~1〇nm. Spectroscopic interference type film thickness meter. (C) After the coating step (A) and the measuring step (B), the bonding step is performed on the adhesive coating surfaces of the optical films 2 and 3, and the polarizing film i is superposed and pressed. Step (C). In the pressurization of this step, a known method can be used. From the viewpoint of being pressurizable while continuously transporting, as shown in Fig. 1, it is preferable to sandwich the pair of nip rolls 20, 21. In this case, it is preferable that the timing at which the optical films 2, 3 are superposed on the polarizing film i is the same as the timing at which the pair of nip rolls ", 21, the pair of the optical cymbals 2, 3 are pressed against the polarizing film 1, even if The difference between the two in timing selection is also shorter. The pair of missing rollers 2〇 and 〇 can be any of the following: metal roller/metal consumption, metal roller/rubber pro-rubber/rubber, etc. #压The pressure at the time is preferably about 150 to 500 N/cm when the pressure is 163198.doc -21 · 201247417 and the pair of clips are 20, 21 (D) control step. There is a control step (D) which is based on the result of the measuring step (B) described above, 'the step of controlling the coating thickness of the adhesive in the coating step (A), that is, 'in the coating step (A) The thickness of the applied adhesive will change with the temperature of the adhesive and the ambient temperature, the surface tension of the optical films 2, 3, and the tension it receives, and it will be accompanied by hope. The deviation of the coating thickness (set thickness γ), in order to correct the deviation of the coating thickness, for the measurement step ( B) The coating thickness control mechanism of the coater is controlled based on the coating thickness (measured thickness X) measured by the spectroscopic interferometry. Specifically, when the measured thickness X is larger than the set thickness Y, The coating thickness control mechanism is controlled in a manner of coating the thickness; the coating thickness control mechanism is controlled to increase the coating thickness by measuring the thickness X by a thickness of γ. For example, if the coating machine is a nozzle coating The machine reduces the ability of the pump or the like to supply liquid to the nozzle when the thickness X is larger than the set thickness Y. On the contrary, when the thickness X is smaller than the set thickness Y, the ability to supply liquid to the nozzle is improved. The coating thickness can be controlled. In addition, when the coater is a closed knife coater using a gravure roll, 'when the measured thickness X is larger than the set thickness Y', the rotation speed of the reverse gravure is increased to increase the rotation. The peripheral speed is used to reduce the amount of transfer of the adhesive; on the contrary, the thickness X is measured to be smaller than the set thickness γ hour, so that the rotational speed of the reverse gravure is reduced to reduce the rotational peripheral speed to increase the transfer amount of the adhesive. Thereby being able to control the coating thickness The degree of film thickness control is empirically set according to the environmental factors at the time, the viscosity of the adhesive, the surface shape of the film, etc. based on the measured thickness χ and the actual thickness γ. The control of the coating thickness control mechanism can be carried out by using a computer or manually. (Ε) The hardening step is as follows. After bonding the optical films 2 and 3 on the polarizing film, if the adhesive is an active energy ray-hardening type And the adhesive is hardened by irradiation of the active energy ray, and the polarizing plate 4 is manufactured through the hardening step (») in the example shown in the figure, the hardening step (Ε), by using the polarizing film The laminate of the optical films 2 and 3 is bonded to the crucible, and the active energy ray irradiation device 18 irradiates the active energy ray. In this step, (4) the energy required to harden the hard-wire curing adhesive is irradiated through the optical film 2. As the active energy ray, specifically, an electron beam or an ultraviolet ray is used, and it is selected according to the hardening reaction mechanism of the binder. Since the electron beam irradiation device has a necessity to shield the electron beam from leaking to the outside, the size and weight of the device are increased. Since the ultraviolet irradiation device has a relatively small structure, it is preferably used by ultraviolet irradiation. Hardening. In the example shown in FIG. 1 , the layered body bonded to the optical films 2 and 3 via the adhesive is irradiated with an active energy ray, and is attached to the aging roller 20 before and after the irradiation device η. 21 is performed in a state where tension is applied to the laminated body between the nip rollers 22 and 23 before winding. However, it is not limited to this. For example, it is preferable to disclose a convex curved surface which is formed in a (four) shape along the conveying direction, and is typically supported by the outer peripheral surface, as disclosed in Japanese Laid-Open Patent Publication No. Hei. In the state, active energy ray irradiation is performed. In particular, when the irradiation of the active energy ray causes heat to occur, and the product is not present, it is preferable to carry out the state in which the laminated body is supported by the outer peripheral surface of the roller as in the latter case. The active energy ray is irradiated. At this time, it is preferable that the roller for supporting the laminated body is temperature-controlled within a range of about 〇 6 6 〇 〇 c. Further, the tongue-producing energy-ray irradiation device can be provided with only one irradiation unit, but two or more flow directions are provided along the laminated body, and irradiation from a plurality of light sources is formed, which is effective in effectively increasing the amount of accumulated light. When the ultraviolet ray is used to cure the adhesive, the ultraviolet light source used is not particularly limited, and can be used for a light distribution having a wavelength of 400 nm or less, 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, a black lamp. Microwave-excited mercury lamps, metal halide lamps, and the like. When an epoxy resin is used as the active energy ray-curable component, the high-pressure mercury lamp having a large amount of light having a wavelength of nm or less is preferably used as the ultraviolet light source when considering the absorption wavelength of the general polymerization initiator. Or the metal toothed lamp β. When the ultraviolet ray is irradiated with an epoxy resin as a curing component, the production line speed of the laminate is not particularly limited. Generally, the coating step is maintained as it is. The line speed in the bonding step. In addition, it is preferable to apply a light amount of 100 to 1000 N/m to the longitudinal direction (transport direction) of the laminate, and to accumulate the amount of light in the wavelength region effective for activation of the polymerization initiator. The total energy to the laminate is 1 〇〇 to 1500 mj/cm 2 ^ If the cumulative amount of light (the amount of integrated light) irradiated to the adhesive is too small, the hardening reaction of the active energy ray-curable adhesive is insufficient, and it is difficult to reflect Adequate bonding strength, on the other hand, if the accumulated amount of light is too large, the heat generated from the light source and the heat generated by the adhesive 163198.doc •24·201247417 may cause active energy line hardening bonding Yellowing of the agent and deterioration of the polarizing film. In addition, if the required amount of light is reached by one time of ultraviolet irradiation, the film will be more than 15 inches due to heat generation. (: high temperature, in this case, it is possible to cause deterioration of the polarizing film to be equal to avoiding such a situation, as described above, 'effectively, a plurality of ultraviolet irradiation devices are disposed along the direction in which the film is conveyed' and irradiated in fractions. The target 'is preferably a case where the irradiation amount of the ultraviolet irradiation device from one place is 6 〇〇mJ/cm 2 or less in terms of cumulative light amount, and finally the above 1 〇〇 15 15 mj/cm 2 can be obtained. The amount of light accumulated by the above method, the thickness of the adhesive is controlled within the set range, the deviation of the bonding strength between the films constituting the polarizing plate is small, and the bubble layer of the adhesive layer is also small. Further, the quality stability of the product is also excellent. Further, the method of the present embodiment is previously described as the refractive index of the bonding agent used for bonding the polarizing film 1 and the optical film 2 or 3, and the optical film 2 or 3 is formed. The refractive index of the thermoplastic resin differs by 0.03 or more. Therefore, when the optical films 2 and 3 are bonded to both surfaces of the polarizing film, if the first optical film 2 is bonded to the polarizing film 1, the adhesive and the first An optical film 2 The difference in refractive index is 〇〇3 or more, and the difference in refractive index between the adhesive for bonding the second optical film 3 to the polarizing film 与 and the first optical film 3 is 〇_〇3 or more, respectively, for the polarized light The method of the present embodiment can be applied to the adhesive formed on both sides of the film i. Of course, in this case, the optical film 2 or 3 bonded to one side of the polarizing film can be bonded to the optical film 2 or 3. For the combination of the agents, the method of the present embodiment is applied, but if the first optical film 2 is attached to the polarizing film 1, the refractive index difference between the bonding agent and the first optical film 2 is 163198.doc • 25- 201247417 And the difference in refractive index between the adhesive for bonding the second optical film 3 to the polarizing film 1 and the second optical film 3 is less than 0.03, and the present embodiment cannot be applied when the polarizing plate of the combination is manufactured. Form method* In addition, the difference in refractive index between the optical film and the adhesive on one side satisfies the above relationship, and the difference in refractive index between the optical film and the adhesive on the other side does not satisfy the above relationship (lower than 0.03) In the case of the optical film application side with a refractive index difference of 0.03 or more with the adhesive The coating thickness of the bonding agent can be applied to the method of the present embodiment, and a polarizing plate can be produced. For example, if the first optical film 2 is attached to the polarizing film, the refractive index of the bonding agent and the first optical film 2 The difference is 0.03 or more, and the difference in refractive index between the polarizing film adhesive and the first optical film 3 for bonding the second optical film 3 to less than 〇_〇3 is suitable for bonding the first optical film 2 The coating thickness of the adhesive on the polarizing film can be made by applying the method of the present embodiment, and a polarizing plate can be produced. In this case, the combination of the first optical film and the adhesive having a refractive index difference of 0.03 or more is used. In other words, the thickness of the adhesive is also uniform, and a polarizing plate having few defects can be produced. Further, as shown in the later-described embodiment, for the combination of the second optical film 3 and the adhesive which does not have a refractive index difference Since the thickness of the adhesive does not cause defects, it can be manufactured on both sides of the polarizing film and the defects are greatly reduced. [Examples] Hereinafter, the present invention will be more specifically described by way of Examples and Comparative Examples, but the present invention is not limited by the examples. Further, the experiments shown below were carried out in order to confirm the effects of the present invention, for example, the following contents were attached: the polarizing film was sandwiched between the clips 163198.doc •26·201247417, and the thickness was measured opposite to the adhesive. The thickness of the adhesive applied on the side is set to be thicker than the optimum value used in the actual operation in such a manner that it does not cause defects. Further, in the following examples, the refractive indices are all values measured by the D line at a temperature of 20 °C. Fig. 3 is a side view schematically showing the arrangement of the apparatus used in the following examples and comparative examples. In the arrangement shown in Fig. 3, the same reference numerals as in Fig. 1 are added to the portions other than the difference points in the following two points. Therefore, the detailed description of the parts will be described with reference to Fig. 1. (3) When the laminated body after the first optical film 2 and the second optical film 3 are bonded to both surfaces of the polarizing film 1 is irradiated with an active energy ray (ultraviolet rays), The second optical film 3 side of the laminated body is in close contact with the outer peripheral surface of the irradiation winding roller 26, and the active energy ray (ultraviolet) irradiation device 18 disposed on the opposite side of the winding roller 26 from the laminated body And irradiating the first optical film 2 side of the laminated body with ultraviolet rays; and (2) because there is only one spectral interference type film thickness meter, the thickness of the adhesive applied on the first optical film 2 is interfered by the first spectral interference The thickness gauge 15 is measured, and the thickness of the adhesive applied on the second optical film 3 is not measured. Further, as the spectral interference type film thickness meter 15, a reflection spectroscopic film thickness meter "FE-2900CCD" manufactured by Otsuka Electronics Co., Ltd. was used. The spectroscopic interferometric film thickness meter measures the film thickness by the spectroscopic interference method described above, and the light source is a D2/I2 lamp having a spectral wavelength range of 230 to 800 nm and a resolution of 1.3 nm0, and then every predetermined setting. Measuring interval, measuring the film thickness of the object to be measured, I63198.doc -27· 201247417 冋 sample in each preset ^. ^ Ri „ 4 _ 'total measurement of each film thickness value output within the time within the flat彳畧ί,Ι #々^ Further, in each of the film ridges obtained by the preset time gate, the data determined as the abnormal value is automatically removed and the average film thickness is output. [Example 1] (〇 In the example, as the first optical film 2, a biaxial directional retardation film "ZE0N0Rj" made of a ring-baked hydrocarbon resin supplied by a roll having a thickness of 60 μm 'width of 133 G is used. Obtained from Japan 2, the refractive index, as the second optical film 3, using the thickness 8 yaw width _, still supplied by the roller of the triacetonitrile cellulose film "KC8UX2mw" [from K〇nicamin〇Ua ) Acquisition, refractive index 148]. The adhesive used for bonding the polarizing film 丨 to the first optical film 2 and the adhesive used for bonding the polarizing film 丨 and the second optical film 3 both contain an epoxy compound and a photopolymerization initiator. The epoxy-based photocurable adhesive which is substantially free of solvent has a refractive index of 1.49. (A) Coating step: a polarizing film 1 having a thickness of 25 μm in which iodine is adsorbed in polyvinyl alcohol, the above-mentioned cycloolefin resin film as the first optical film 2, and the above-mentioned triacetone as the second optical disk 3 The cellulose film was supplied at the line speed of i5 m/min, in the same flow direction. In the surface of the cycloolefin-based resin film 2 to which the polarizing film 1 is bonded, the first coater 10 (a "mini-closed doctor blade" manufactured by Fuji Electric Co., Ltd.) having a gravure roll is used, and the above coating is applied. Epoxy light curing adhesive. In addition, the second coating machine 12 having the gravure roll 13 is used for the surface of the above-mentioned triacetonitrile cellulose 163198.doc •28·201247417 臈3 to be bonded to the polarizing film 1 [the same as Fuji Electric Co., Ltd. The "micro-closed scraper" is also coated with the epoxy-based photocurable adhesive described above. The gravure rolls 11, 13 provided on the coaters 10, 12 are reversely rotated with respect to the conveyance direction of the film. Then, in the second coater 12 on the side of the triacetone cellulose film 3, it is set in such a manner that the gravure roll 13 has a peripheral speed of 15 m/min and a film of about 45 μm on the film. The thickness is applied to the adhesive. Since the thickness of the adhesive applied by the second coater 12 is not measured, the film thickness control is not performed, and the adhesive is applied to the thickness substantially without defects. On the other hand, on the side of the cycloolefin-based resin film 2, the circumferential speed of the rotation of the gravure roll 11 provided in the first coater 10 is initially set to 2 丨 minutes, and the adhesive is applied at a thickness of about 2 ό μηη. (Β) The measurement step is performed on the side of the adhesive coated surface of the cycloolefin-based resin film 2 disposed on the downstream side of the first coater 10, and the measurement interval is 〇5 seconds. The coating thickness was measured for 1 minute (120 times), and the average value of the 1 minute was sequentially output as the measured thickness X. Then, a control step (D) to be described later is provided, and while controlling the thickness X for the measurement, the operation is performed for 150 minutes, and the average value and the standard deviation of the measured thickness χ (number of data 15 〇) obtained in the 150 minutes are obtained. The results are shown in Table 1. (C) bonding step: a cycloolefin-based resin film 2 and a triacetyl cellulose film 3 coated with an adhesive, each of which has an adhesive application surface and a polarizing film 1 superposed thereon, and a bonding roller for bonding 20, 21 was lost with a line pressure of 240 N/cm. The side of the triethylene phthalocyanine membrane 3 is set by the laminate of the cycloolefin resin film 2 / the polarizing film 1 / triethylene fluorene cellulose film 3 after Yan 2, 163198.doc -29-201247417 21 The outer peripheral surface of the winding roller 26 was adhered to the outer surface of the winding roller 26 at 20 ° C, so that a tension of 6 〇〇 N/m was applied in the longitudinal direction to the same line speed 丨 5 m / min as before the bonding, while The cycloolefin resin film 2 side is transported while being irradiated with ultraviolet rays from the ultraviolet irradiation device 18. The ultraviolet ray irradiation device 18 is made of GS Yuasa, and is irradiated with ultraviolet light from the "EHAN1700NAL high-pressure mercury lamp" which is an ultraviolet lamp. In terms of the cumulative amount of ultraviolet light, the total of 2 lamps is 330 mJ/cm2. The adhesive layer is cured in this manner, and the polarizing plate 4 to which the cycloolefin resin film 2 is bonded to one surface of the polarizing film 1 and the triethylene cellulose film 3 is bonded to the other surface is produced, and is taken up to a take-up roll. 30 on. (D) Control step In the control step, it is controlled that the juice thickness X obtained in the above measurement step deviates from 5 by a set thickness γ = 2.6 μηη. /. In the case of the above, in the case of I Χ-Υ | 20.13 μηη, the circumferential speed of the gravure roll 11 provided on the first coater 10 is increased or decreased in units of 〇5 m/min. The coating thickness of the agent is close to the set thickness Y. [Comparative Example 1] In Comparative Example 1, the control step (D) in the first embodiment was not provided, that is, the first coater 10 was not changed even if the measured thickness 得到 obtained in the measurement step (B) was changed. The rotation speed of the gravure roll u is provided, and the laminated body is produced. The average value and the standard deviation of the measured thickness 时 when the polarizing plate 1 is produced by ultraviolet irradiation for 150 minutes are shown in Table 1. 163198.doc -30-201247417 [Example 2] Instead of the biaxially oriented retardation film "ZEONOR" made of the cycloolefin resin in Example 1, a biaxially oriented poly-pair having a thickness of 38 μm and a width of 1330 mm was used. Ethylene formate film [obtained from Mitsubishi resin (strand), refractive index 1.60] as the first optical film 2; in addition, instead of the triacetyl cellulose film "KC8UX 2MW", used as the first optical in Example 1. A biaxially oriented retardation film "ZEONOR" made of a ring-shaped rare hydrocarbon resin of 貘2 was used as the second optical film 3', and a polarizing plate was produced in the same manner as in Example 。. The average and standard deviation of the measured thickness 将 at 150 minutes of operation are shown in Table 1. [Comparative Example 2] The control step (D) of the second embodiment is not provided, that is, even if the measured thickness X obtained in the measurement step (Β) is changed, the gravure roll 11 provided in the first coater 1 is not changed. The rotational speed was used to produce a laminate, and the ultraviolet ray irradiation was continued in the same manner to prepare a polarizing plate. The average and standard deviation of the measured thickness X at 15 minutes of operation are shown in Table 。. [Comparative Example 3] The biaxially oriented retardation film "ZEONOR" manufactured by the cycloolefin resin in the alternative example 1 was subjected to a biaxial directional phase difference made of triacetyl cellulose having a thickness of 40 μm and a width of 133 mm. A film "KC4FR-1" [obtained from Konicaminolta (share), refractive index 1.48] was used as the first optical film 2, and a polarizing plate was produced in the same manner as in Example 1. At this time, since the refractive index of the triacetyl cellulose film used as the first optical film 2 is close to the refractive index of the adhesive, the thickness of the adhesive cannot be measured in the step (B), and thus cannot be Control the adhesion thickness of the adhesive 163l98.doc 201247417. [Defect Evaluation Test of Polarizing Plate] In the above embodiments and comparative examples, the width of the central portion of the polarizing plate obtained by the width of i 3 3 〇 mm was removed by the width of each of the two ends by 4 mm. The part of 1250 mm is the effective width. Within this effective width, it spans the length of the flow direction of 3300 mm (丨.25 mx3.3 m and 4 m2), marking the place where the bright spot is visually observed, and then A magnifying glass with a magnification of 1 观察 observes the mark where it has passed, and confirms whether it is a bubble. Then, if it is a bubble, it is obtained according to the following method. That is, if the observed bubble is quasi-elliptical (including a circle), the longest diameter is used as the size of the bubble; if the bubble is linear, the length of the line is taken as the size of the bubble. Then, the number of bubbles having a size of 100 μm or more is counted, and when the number is less than 0.3 per 1 m 2 , that is, when there are 0 or 1 in the area of 4 m 2 observed, it is “οκ”; When the number of Si 〇12 is 〇3 or more, that is, when there are two or more areas of 4 m2 observed, it is "NG", and the result is summarized in the table together with the main variables. In the table, "cop" in the column of the optical film, ring-and-ring type resin, and "PET" means polyethylene terephthalate. "TAC" means triacetyl cellulose. Furthermore, in the case of a bubble having a size larger than 1 GG μϊη observed by a magnifying glass, it was confirmed that the bubble was in a polarized light when the film was cut into a size of 40 mm×40 mm by the method of inclusion and observed with a microscope. In the adhesive layer between the film and the first optical film 2. 163198.doc -32- 201247417 [Table l]

示例No. 光學膜 上段：各類 下段：折射率 黏接 劑之 折射率 控制 步驟 (〇) 設定 厚度Y 計測厚度 缺陷 評估 結果 平均值 標準偏差 實施例1 COP 1.53 1.49 有 2.6 μιπ 2.61 μηι 0.05 μιυ OK 比較例1 無 2.45 μπι 0.17 μτη NG 實施例2 PET 1.60 1.49 有 2.6 μχη 2.68 μπι 0.07 μιυ OK 比較例2 無 2.44 μηι 0.17 μπι NG 比較例3 TAC 1.48 1.49 不可進行 2.6 μπι 不可測量 NG 註）OK :大小為100 μηι以上之氣泡之數量每1 m2少於0.3個 NG :大小為ΙΟΟμηι以上之氣泡之數量每1 m2為0.3以上 如表1所示可知，未設置控制步驟（D)之比較例1與2中， 黏接劑之計測厚度發生變動，伴隨此，於所得到之偏光板 上可見氣泡缺陷，相對於此，設置有控制步驟（D)且於黏 接劑之計測厚度X相比設定厚度Y而偏離5%以上時使塗佈 厚度改變之實施例1與2中，計測厚度相比設定厚度Y被抑 制為大概5%以内之變動，氣泡缺陷亦少。另一方面，如 比較例3般，黏接劑之折射率與光學膜之折射率之差未達 0.03時，無法由分光干涉式膜厚計計測黏接劑之塗佈厚 度。 【圖式簡單說明】 圖1係表示較佳地應用於本發明中之製造裝置之配置例 之概略側面圖。 圖2係表示本發明之各步驟間之關係之一例之方塊圖。 圖3係表示實施例中使用之製造裝置之配置之概略側面 圖。 【主要元件符號說明】 -33- 163198.doc 201247417 1 偏光膜 2 第一光學膜 3 第二光學膜 4 偏光板 10 第一塗佈機 11 凹版輥 12 第二塗佈機 13 凹版輥 15 第一分光干涉式膜厚計 16 第二分光干涉式膜厚計 18 活性能量線（紫外線）照射裝置 20 ' 21 貼合用夾輥 22 ' 23 捲取前夾輥 24 導向輥 26 照射用捲繞輥 30 捲取輥 163198.doc -34·Example No. Upper section of optical film: various lower sections: Refractive index control step of refractive index adhesive (〇) Setting thickness Y Measuring thickness defect evaluation result Mean standard deviation Example 1 COP 1.53 1.49 2.6 μιπ 2.61 μηι 0.05 μιυ OK Comparative Example 1 No 2.45 μπι 0.17 μτη NG Example 2 PET 1.60 1.49 2.6 μχη 2.68 μπι 0.07 μιυ OK Comparative Example 2 No 2.44 μηι 0.17 μπι NG Comparative Example 3 TAC 1.48 1.49 Cannot be 2.6 μπι Unmeasurable NG Note) OK: Size The number of bubbles of 100 μηι or more is less than 0.3 NG per 1 m 2 : the number of bubbles having a size of ΙΟΟμηι or more is 0.3 or more per 1 m 2 . As shown in Table 1, Comparative Example 1 in which the control step (D) is not provided is In the case where the thickness of the adhesive is changed, the bubble defect is observed on the obtained polarizing plate. In contrast, the control step (D) is provided and the thickness is set in comparison with the thickness X of the adhesive. In Examples 1 and 2 in which the coating thickness was changed when Y was deviated by 5% or more, the set thickness Y was suppressed to be within about 5% of the measured thickness. Bubble defects is also less. On the other hand, as in Comparative Example 3, when the difference between the refractive index of the adhesive and the refractive index of the optical film was less than 0.03, the coating thickness of the adhesive could not be measured by the spectral interference type film thickness meter. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic side view showing an arrangement example of a manufacturing apparatus preferably applied to the present invention. Fig. 2 is a block diagram showing an example of the relationship between the steps of the present invention. Fig. 3 is a schematic side view showing the arrangement of a manufacturing apparatus used in the embodiment. [Main component symbol description] -33- 163198.doc 201247417 1 Polarizing film 2 First optical film 3 Second optical film 4 Polarizing plate 10 First coater 11 Gravure roll 12 Second coater 13 Gravure roll 15 First Spectroscopic interference film thickness meter 16 Second spectral interference type film thickness meter 18 Active energy ray (ultraviolet light) irradiation device 20 ' 21 Laminating nip roller 22 ' 23 Winding front nip roller 24 Guide roller 26 Irradiation winding roller 30 Take-up roll 163198.doc -34·

Claims (1)

201247417 七、申請專利範圍： 1. 一種偏光板之製造方法，其係製造偏光板者，且包括下 述步驟： (A) 於熱可塑性樹脂製之光學膜上，使用包含黏接劑 . 之塗佈厚度之控制部之塗佈機塗佈上述黏接劑，於20°C 下由D線所測量之上述光學膜之折射率處於^〜丨7之範 圍’於20°C下由D線所測量之上述黏接劑之折射率與於 20°C下由D線所測量之上述光學膜之折射率相差〇 〇3以 上； (B) 藉由分光波長範圍設定於8〇〇 nrn以下之範圍内之分 光干涉法，對所塗佈之上述黏接劑之厚度進行計測； (C) 於上述光學膜之黏接劑塗佈面重疊聚乙烯醇系樹脂 製之偏光膜，將上述光學膜相對於上述偏光膜加壓，使 上述偏光膜與上述光學膜經由上述黏接劑貼合； (D) 根據在〇.5〜5 μηι之範圍内所設定之上述黏接劑之設 定厚度Υ與上述黏接劑之計測厚度X，對上述控制部進行 控制。 2. 如請求項1之偏光板之製造方法，其中當上述黏接劑之 计測厚度X與上述黏接劑之設定厚度γ之差之絕對值相對 於上述黏接劑之設定厚度γ之比例為特定值以上時，上 述控制部受到控制。 3. ^請求項丨之偏光板之製造方法，其中當上述黏接劑之 計測厚度X與上述黏接劑之設定厚度γ之差之絕對值相對 於上述黏接劑之設定厚度Υ之比例為5%以上時，上述控 制部受到控制。 163198.doc201247417 VII. Patent application scope: 1. A method for manufacturing a polarizing plate, which is a method for manufacturing a polarizing plate, and includes the following steps: (A) Applying an adhesive containing an adhesive to an optical film made of a thermoplastic resin. The coating machine of the control portion of the cloth thickness coats the above-mentioned adhesive, and the refractive index of the optical film measured by the D line at 20 ° C is in the range of ^ 丨 7 ' at 20 ° C by the D line The refractive index of the above-mentioned adhesive is measured to be different from the refractive index of the optical film measured by the D line at 20 ° C by 〇〇3 or more; (B) The range of the wavelength of the splitting light is set to be less than or equal to 8 〇〇 nrn. a spectroscopic interference method for measuring the thickness of the applied adhesive; (C) superimposing a polarizing film made of a polyvinyl alcohol resin on the surface of the adhesive coating surface of the optical film, and opposing the optical film Pressing the polarizing film to bond the polarizing film and the optical film via the adhesive; (D) setting the thickness of the adhesive set in the range of 〇5 to 5 μηι The measured thickness X of the adhesive is applied to the above control unit System. 2. The method of manufacturing a polarizing plate according to claim 1, wherein a ratio of an absolute value of a difference between the measured thickness X of the adhesive and the set thickness γ of the adhesive to a set thickness γ of the adhesive is When the value is equal to or greater than a specific value, the control unit is controlled. 3. The method for manufacturing a polarizing plate according to claim 1, wherein a ratio of an absolute value of a difference between the measured thickness X of the adhesive and the set thickness γ of the adhesive to a set thickness Υ of the adhesive is When it is 5% or more, the above control unit is controlled. 163198.doc
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