JP3731757B2 - Manufacturing method of polarizing plate - Google Patents
Manufacturing method of polarizing plate Download PDFInfo
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- JP3731757B2 JP3731757B2 JP14219394A JP14219394A JP3731757B2 JP 3731757 B2 JP3731757 B2 JP 3731757B2 JP 14219394 A JP14219394 A JP 14219394A JP 14219394 A JP14219394 A JP 14219394A JP 3731757 B2 JP3731757 B2 JP 3731757B2
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Description
【０００１】
【産業上の利用分野】
本発明は、フィルム型液晶表示用セル一体型偏光板に好適な、偏光板の製造方法に関するものである。
【０００２】
【従来の技術】
現在フィルム型液晶表示セルに用いる偏光板は接着剤層、粘着剤層を介して偏光板を液晶表示セルに後貼りする方法が一般的に行われている。しかし、この方法はフィルム型液晶表示セルと偏光板に使用されている基材が異なることから熱、湿度等での伸縮差により発生する反り、歪み、また粘着層に関連して発生する信頼性等に問題が発生する。
【０００３】
一般的に、高分子フィルムは熱処理することで熱収縮率が改善されることは公知である。しかし、電極パターンを精度良く得るには熱処理だけでは不十分である。また、セル一体型偏光板タイプのフィルム液晶表示セルでは、セル製造の際１２０℃〜１６０℃程度の温度で数時間熱をかける工程があり、その熱のため偏光板が熱収縮してしまい、電極パターンを精度良く得ることが難しく、実用化に至っていないのが現状である。
【０００４】
【発明が解決しようとする課題】
本発明は、セル一体型偏光板フィルム液晶表示セル製造工程上でかかる熱により生じる熱収縮を抑制し電極パターンを精度良く得ること、また材質が異なることから生じる反り、歪みを防ぐための手段を提供することを目的とする。
【０００５】
【課題を解決するための手段】
本発明者等は、この目的を達成するにあたり鋭意研究の結果、偏光素子の製造に於て延伸倍率を２〜３．７倍の範囲で延伸することにより熱収縮が抑制されることを見出した。本発明はこの知見に基づいて完成されたものである。即ち、本発明は、
（１）２〜３．７倍に延伸され、二色性色素で着色された偏光素子フィルムを支持体に接着剤で接着することを特徴とする偏光板の製造方法、
（２）フィルムがポリビニルアルコール系フィルムである上記（１）の偏光板の製造方法、
（３）２〜３．７倍に延伸され、二色性色素で着色された偏光素子フィルムの両面に支持体を接着剤で接着した後、熱処理することを特徴とする偏光板の製造方法、
（４）支持体がポリアリレートフィルム、ポリカーボネートフィルム又はアルカリで表面処理した三酢酸セルロースフィルムである上記（１）又は（３）の偏光板の製造方法、
（５）接着剤が非溶剤系の接着剤である上記（１）又は（３）の偏光板の製造方法、
（６）非溶剤系の接着剤がエネルギー線硬化型接着剤又は熱硬化型接着剤である上記（５）の偏光板の製造方法、
（７）熱処理の温度が１２０℃〜１７０℃である上記（３）の偏光板の製造方法、
に関する。
【０００６】
本発明における偏光素子フィルムに使用する基材は、透明で、延伸可能なものなら特に制限なく、例えばポリビニルアルコール等のポリビニルアルコール系フィルムやエチレン−酢酸ビニル共重合体ケン化物フィルムがあげられるが、延伸の容易さを考慮すると、特にポリビニルアルコール系フィルムが好ましい。又、延伸乾燥後の膜厚が約２５〜５０μｍ程度となるの膜厚ものが好ましく、延伸前の膜厚は例えば約６０〜７０μｍ程度である。
【０００７】
本発明の偏光素子の製造方法において使用する二色性染料としては、例えば酸性染料、直接染料等の水溶性染料が好ましく、その構造としては、例えばアゾ系染料、スチルベン系染料、アントラキノン系染料、メチン系染料、シアニン系染料等が使用できる。具体的な例としては、例えば特開昭５９−１４５２５５号公報や特開昭６０−１５６７５９号公報記載のジスアゾ化合物、特開平３−７８７０３号公報記載のトリスアゾ化合物及びカラーインデックスゼネリックネームで表されるCI Direct Yellow 12 、CI Direct Yellow 44 、CI Direct Orange 26 、CI Direct Orange 39 、CI Direct Red 2 、CI Direct Red 23、CI Direct Red 31、CI Direct Red 79、CI Direct Red 81、CI Direct Vilet 9 、CI Direct Vilet 35、CI Direct Vilet 51、CI Direct Blue 15 、CI Direct Blue 78 、CI Direct Blue 90 、CI Direct Blue 168、CI Direct Blue 202、CI Direct Blue 203、CI Direct Brown 2 、CI Direct Black 17、CI Direct Black 19、CI Direct Black 118 、CI Direct Black 132 等があげられる。尚、これらの水溶性染料は、偏光能を与えうる色素成分の含有率が９５％、より好ましくは９９％以上（いずれも重量比）であることが望ましく、無機塩や未反応物等の目的色素成分以外の不純物はイオン交換膜法、再結晶法等の方法により除去される。実際の使用に際しては、単一染料では特有の波長域のみしか偏光特性を有しないため、最も一般的に用いられる４００〜７００ｎｍの可視光線の全波長域にわたって優れた偏光特性を有する偏光素膜を得るために、この波長域内で異なる範囲に吸収特性を有する２種類以上の水溶性染料を適宜配合して使用するのが好ましい。具体的な組み合わせの例としては、CI Direct Orange 39 、CI Direct Red 81、特開昭５９−１４５２５５号公報の実施例２３に記載のグリーンブルー、特開平３−７８７０３号公報記載のブルーの４種類配合等がある。
【０００８】
本発明の偏光素子の製造方法において、上記フィルムの染色は、例えば濃度約０．０２〜０．１％の染料水溶液を用い、温度約３０〜５０℃で、約２〜１０分間行われる。その詳細は、例えば特開昭５９−１４５２５５号公報に記載されている。また、染色前又は染色後のフィルムの延伸は、例えば染色したフィルムを、濃度約２〜５％のほう酸水溶液中で約３０〜６０℃で２〜３．７倍、好ましくは３．２〜３．７倍に縦方向に一軸延伸する方法があげられる。その詳細は、例えば特開昭５９−１４５２５５号公報や特開昭６０−１５６７５９号公報に記載されている。得られた偏光素子は、必要に応じ、緊張下水またはアルコールで表面が洗浄され、乾燥される。乾燥は、好ましくは、熱風乾燥で９０℃〜１３０℃で５〜１０分程度行うのがよい。尚、予め二色性染料を添加して着色した基材を使用してもよく、この場合はその基材をそのまま濃度約２〜５％のほう酸水溶液中で約３０〜６０℃で２〜３．７倍、好ましくは３．２〜３．７倍に縦方向に一軸延伸すればよい。
【０００９】
以上の方法で得られた偏光素子の片面又両面に、好ましくは両面に、支持体を接着剤を用いて接着し、乾燥することにより本発明の偏光板が得られる。ここで使用する支持体としては、例えばアルカリで表面処理した三酢酸セルロースフィルム、エルメック Ｆ−１１００（鐘淵化学工業（株）製）やＵポリマー（ユニチカ（株）製）等のポリアリレートフィルム、ノバレックス（三菱化成工業（株）製）、ユーピロン（三菱瓦斯化学（株）製）、パンライト（帝人化成（株）製）等のポリカーボネートフィルム等があげられる。これらのフィルムの厚さは約５０〜１５０μｍ、好ましくは約７０〜１００μｍ程度である。接着剤としては、特に制限ないが、非溶剤系の接着剤が好ましく、例えばエネルギー線硬化型接着剤又は熱硬化型接着剤があげられる。エネルギー線硬化型接着剤としては、例えばウレタンアクリレート、エポキシアクリレート、ポリエステルアクリレート等の紫外線硬化型接着剤が、熱硬化型接着剤としては、例えばポリエステル系樹脂、エポキシ系樹脂、ウレタン系樹脂等があげられる。
【００１０】
偏光素子への支持体の接着は、例えば支持体に乾燥後の厚さが約１０〜５０μｍ、好ましくは約１５〜３０μｍ、さらに好ましくは約１５〜２５μｍ程度となるように接着剤を塗布し、その塗布面を偏光素子に張り合わせ、紫外線を照射もしくは加熱して接着剤を硬化させることにより行われる。紫外線硬化型接着剤を使用した場合、紫外線照射後の乾燥は、例えば１１０℃〜１４０℃で５〜１０分程度行われる。
【００１１】
以上の方法により熱収縮の抑制された本発明の偏光板が得られるが、乾燥後、乾燥状態で熱処理を行うことにより、熱収縮がさらに抑制された偏光板が得られる。この熱処理はアニール処理と呼ばれ、その条件は１２０℃以上、好ましくは１２０℃〜１７０℃、より好ましくは１２５℃〜１６０℃、さらに好ましくは１３０℃〜１５０℃で１０〜１００分間、より好ましくは２０〜８０分間、さらに好ましくは３０〜６０分間程度である。
【００１２】
【実施例】
以下実施例、比較例を挙げて本発明をさらに具体的に説明するが、本発明がこれらの実施例に限定されるものではない。
【００１３】
実施例１
膜厚７０μｍのポリビニルアルコールフィルムを膨潤後、CI Direct Orange 39 、CI Direct Red 81、特開昭５９−１４５２５５号公報の実施例２３記載のグリーンブルー、特開平３−７８７０３号公報記載のブルーを重量比で４：３：２：２の割合で配合した二色性色素の０．１％水溶液で４０℃、２分間染色した。この染色したポリビニルアルコールフィルムをホウ酸浴中、延伸倍率３．２で縦方向に一軸延伸、９０℃で４分間乾燥して偏光素子を得た。この偏光素子を、紫外線（ＵＶ）硬化型接着剤（ウレタンアクリレートとエポキシアクリレートの６：４混合物；日本化薬（株）製）を乾燥後の厚さ２０μｍとなるように塗布した２枚の膜厚７０μｍのポリアリレートフィルム（エルメックＦ−１１００；鐘淵化学工業（株）製）で挟持、ＵＶ照射後１１０℃で６分間乾燥し、アニール処理をしない本発明の偏光板を得た。この偏光板を１３０℃で３０分間熱処理し、アニール処理した本発明の偏光板を得た。アニール処理前後での寸法変化は−０．１３％であった。このアニール処理した偏光板を、セル製造の際の加熱条件と同様の、１３０℃で５時間加熱したところ、熱収縮率は−０．０８％であった。
【００１４】
実施例２
ポリビニルアルコールフィルムを膨潤後、二色性色素で染色した。この染色したポリビニルアルコールフィルムをホウ酸浴中延伸倍率３．６で延伸９０℃で４分間乾燥して偏光素子を得た。この偏光素子を、紫外線（ＵＶ）硬化型接着剤（ウレタンアクリレート、エポキシアクリレートとポリエステルアクリレートの６：２：２混合物；日本化薬（株）製）を乾燥後の厚さ２０μｍとなるように塗布した２枚のポリアリレートフィルムで挟持、ＵＶ照射後１１０℃で６分間乾燥し、アニール処理をしない本発明の偏光板を得た。この偏光板を１３０℃で３０分間熱処理し、アニール処理した本発明の偏光板を得た。アニール処理前後での寸法変化は−０．２６％であった。このアニール処理した偏光板を、セル製造の際の加熱条件と同様の、１３０℃で５時間加熱したところ、熱収縮率は−０．０４％であった。
【００１５】
実施例３
偏光素子は実施例１と同様にして得た。ＵＶ硬化型接着剤（ウレタンアクリレートとエポキシアクリレートの６：４混合物；日本化薬（株）製）を乾燥後の厚さ２０μｍとなるように塗布した２枚のポリカーボネートフィルムで挟持、ＵＶ照射後１１０℃で６分間乾燥し、アニール処理をしない本発明の偏光板を得た。この偏光板を１３０℃で３０分間熱処理し、アニール処理した本発明の偏光板を得た。アニール処理前後での寸法変化は−０．２３％であった。このアニール処理した偏光板を、セル製造の際の加熱条件と同様の、１３０℃で５時間加熱したところ、熱収縮率は−０．０９％であった。
【００１６】
比較例１
延伸倍率を除き、実施例１と同様に行なった。即ち、膜厚７０μｍのポリビニルアルコールフィルムを膨潤後、CI Direct Orange 39 、CI Direct Red 81、特開昭５９−１４５２５５号公報の実施例２３に記載のグリーンブルー、特開平３−７８７０３号公報記載のブルーを重量比で４：３：２：２の割合で配合した二色性色素の０．１％水溶液で４０℃、２分間染色した。この染色したポリビニルアルコールフィルムをホウ酸浴中延伸倍率４．０で縦方向に一軸延伸し、９０℃で４分間乾燥して偏光素子を得た。この偏光素子を、紫外線（ＵＶ）硬化型接着剤（ウレタンアクリレートとエポキシアクリレートの６：４混合物；日本化薬（株）製）を乾燥後の厚さ２０μｍとなるように塗布した２枚の膜厚７０μｍのポリアリレートフィルム（エルメックＦ−１１００；鐘淵化学工業（株）製）で挟持、ＵＶ照射後１１０℃で６分間乾燥し、アニール処理をしない本発明の偏光板を得た。この偏光板を１３０℃で３０分間熱処理（アニール処理）した。アニール処理前後での寸法変化は−０．７０％であった。このアニール処理した偏光板を、セル製造の際の加熱条件と同様の、１３０℃で５時間加熱したところ、熱収縮率は−０．１８％であった。
【００１７】
【発明の効果】
本発明の方法により製造した偏光板をフィルムセル用に使用することでセル化工程でかかる熱により起こる収縮を抑制でき、精度良く電極パターンをが得ることができる。また、偏光板とセルを一体型とすることで熱、湿度での反りや歪みの少ないフィルム状の液晶表示セルが得られる。[0001]
[Industrial application fields]
The present invention relates to a method for producing a polarizing plate suitable for a cell-integrated polarizing plate for film-type liquid crystal display.
[0002]
[Prior art]
Currently, a polarizing plate used for a film-type liquid crystal display cell is generally subjected to a method of post-attaching a polarizing plate to a liquid crystal display cell via an adhesive layer and an adhesive layer. However, this method is different in the substrate used for the film type liquid crystal display cell and the polarizing plate, so warpage, distortion, and reliability generated due to the difference in expansion / contraction due to heat, humidity, etc. Problems occur.
[0003]
Generally, it is known that the heat shrinkage rate of a polymer film is improved by heat treatment. However, heat treatment alone is insufficient to obtain an electrode pattern with high accuracy. In addition, in the cell-integrated polarizing plate type liquid crystal display cell, there is a step of applying heat at a temperature of about 120 ° C. to 160 ° C. for several hours at the time of cell production, and the polarizing plate heat shrinks due to the heat, At present, it is difficult to obtain an electrode pattern with high accuracy and it has not been put into practical use.
[0004]
[Problems to be solved by the invention]
The present invention provides a means for preventing warpage and distortion caused by suppressing the thermal shrinkage caused by heat applied in the cell-integrated polarizing film liquid crystal display cell manufacturing process and obtaining an electrode pattern with high accuracy, and by different materials. The purpose is to provide.
[0005]
[Means for Solving the Problems]
As a result of intensive studies to achieve this object, the present inventors have found that thermal contraction is suppressed by stretching the stretching ratio in the range of 2 to 3.7 times in the production of a polarizing element. . The present invention has been completed based on this finding. That is, the present invention
(1) A method for producing a polarizing plate, characterized by adhering a polarizing element film stretched 2 to 3.7 times and colored with a dichroic dye to a support with an adhesive,
(2) The method for producing a polarizing plate according to (1), wherein the film is a polyvinyl alcohol film,
(3) A method for producing a polarizing plate, characterized in that a support is bonded to both surfaces of a polarizing element film stretched 2 to 3.7 times and colored with a dichroic dye, and then heat-treated.
(4) The method for producing a polarizing plate according to (1) or (3), wherein the support is a polyarylate film, a polycarbonate film, or a cellulose triacetate film surface-treated with an alkali,
(5) The method for producing a polarizing plate according to (1) or (3), wherein the adhesive is a non-solvent adhesive,
(6) The method for producing a polarizing plate according to (5), wherein the non-solvent adhesive is an energy ray curable adhesive or a thermosetting adhesive,
(7) The method for producing a polarizing plate according to (3), wherein the heat treatment temperature is 120 ° C to 170 ° C,
About.
[0006]
The base material used for the polarizing element film in the present invention is not particularly limited as long as it is transparent and stretchable, and examples thereof include polyvinyl alcohol films such as polyvinyl alcohol and saponified ethylene-vinyl acetate copolymers. In view of easiness of stretching, a polyvinyl alcohol film is particularly preferable. Moreover, the thing of the film thickness from which the film thickness after extending | stretching and drying will be about 25-50 micrometers is preferable, and the film thickness before extending | stretching is about 60-70 micrometers, for example.
[0007]
As the dichroic dye used in the method for producing a polarizing element of the present invention, for example, water-soluble dyes such as acid dyes and direct dyes are preferable, and the structures thereof include, for example, azo dyes, stilbene dyes, anthraquinone dyes, Methine dyes, cyanine dyes and the like can be used. Specific examples include the disazo compounds described in JP-A-59-145255 and JP-A-60-156759, the trisazo compounds described in JP-A-3-78703, and the color index general name. CI Direct Yellow 12, CI Direct Yellow 44, CI Direct Orange 26, CI Direct Orange 39, CI Direct Red 2, CI Direct Red 23, CI Direct Red 31, CI Direct Red 79, CI Direct Red 81, CI Direct Vilet 9, CI Direct Vilet 35, CI Direct Vilet 51, CI Direct Blue 15, CI Direct Blue 78, CI Direct Blue 90, CI Direct Blue 168, CI Direct Blue 202, CI Direct Blue 203, CI Direct Brown 2, CI Direct Black 17, CI Direct Black 19, CI Direct Black 118, CI Direct Black 132 and the like. These water-soluble dyes preferably have a pigment component content that can impart polarizing ability of 95%, more preferably 99% or more (both in weight ratio). Impurities other than the dye component are removed by a method such as an ion exchange membrane method or a recrystallization method. In actual use, since a single dye has a polarization characteristic only in a specific wavelength range, a polarizing element film having excellent polarization characteristics over the entire wavelength range of visible light of 400 to 700 nm, which is most commonly used, is used. In order to obtain it, it is preferable to use two or more water-soluble dyes having absorption characteristics in different ranges within this wavelength range. Examples of specific combinations include CI Direct Orange 39, CI Direct Red 81, green blue described in Example 23 of JP-A-59-145255, and blue of JP-A-3-78703. There are blends.
[0008]
In the method for producing a polarizing element of the present invention, the film is dyed, for example, using a dye aqueous solution having a concentration of about 0.02 to 0.1% at a temperature of about 30 to 50 ° C. for about 2 to 10 minutes. Details thereof are described in, for example, JP-A-59-145255. Further, stretching of the film before dyeing or after dyeing may be performed by, for example, treating the dyed film in an aqueous solution of boric acid having a concentration of about 2 to 5% at a temperature of about 30 to 60 ° C. by 2 to 3.7 times, preferably 3.2 to 3 times. A method of uniaxially stretching in the machine direction by 7 times. Details thereof are described in, for example, JP-A-59-145255 and JP-A-60-156759. The surface of the obtained polarizing element is washed with tensioned sewage or alcohol as necessary, and dried. Drying is preferably performed by hot air drying at 90 ° C. to 130 ° C. for about 5 to 10 minutes. In addition, you may use the base material which added and added the dichroic dye previously, and in this case, it is 2-3 at about 30-60 degreeC in the boric acid aqueous solution with a density | concentration of about 2-5% as it is. The film may be uniaxially stretched in the machine direction by 0.7 times, preferably 3.2 to 3.7 times.
[0009]
The polarizing plate of the present invention can be obtained by adhering a support using an adhesive to one side or both sides, preferably both sides, of the polarizing element obtained by the above method and drying. Examples of the support used here include cellulose triacetate films surface-treated with alkali, polyarylate films such as Elmec F-1100 (manufactured by Kaneka Chemical Co., Ltd.) and U polymer (manufactured by Unitika Ltd.), Examples thereof include polycarbonate films such as Novalex (manufactured by Mitsubishi Kasei Kogyo Co., Ltd.), Iupilon (manufactured by Mitsubishi Gas Chemical Co., Ltd.), Panlite (manufactured by Teijin Chemicals Ltd.), and the like. The thickness of these films is about 50 to 150 μm, preferably about 70 to 100 μm. Although there is no restriction | limiting in particular as an adhesive agent, A non-solvent adhesive agent is preferable, for example, an energy-beam curable adhesive agent or a thermosetting adhesive agent is mention | raise | lifted. Examples of the energy ray curable adhesive include ultraviolet curable adhesives such as urethane acrylate, epoxy acrylate, and polyester acrylate, and examples of the thermosetting adhesive include polyester resins, epoxy resins, and urethane resins. It is done.
[0010]
For adhesion of the support to the polarizing element, for example, an adhesive is applied to the support so that the thickness after drying is about 10 to 50 μm, preferably about 15 to 30 μm, more preferably about 15 to 25 μm, The coated surface is bonded to the polarizing element, and ultraviolet rays are irradiated or heated to cure the adhesive. When an ultraviolet curable adhesive is used, drying after ultraviolet irradiation is performed at 110 ° C. to 140 ° C. for about 5 to 10 minutes, for example.
[0011]
Although the polarizing plate of the present invention in which thermal shrinkage is suppressed is obtained by the above method, a polarizing plate in which thermal shrinkage is further suppressed is obtained by performing heat treatment in a dry state after drying. This heat treatment is called annealing treatment, and the condition is 120 ° C. or higher, preferably 120 ° C. to 170 ° C., more preferably 125 ° C. to 160 ° C., further preferably 130 ° C. to 150 ° C. for 10 to 100 minutes, more preferably It is about 20 to 80 minutes, more preferably about 30 to 60 minutes.
[0012]
【Example】
EXAMPLES Hereinafter, although an Example and a comparative example are given and this invention is demonstrated further more concretely, this invention is not limited to these Examples.
[0013]
Example 1
After swelling a 70 μm-thick polyvinyl alcohol film, CI Direct Orange 39, CI Direct Red 81, green blue described in Example 23 of JP 59-145255 A, and blue described in JP 3-78703 A are weighted. It dye | stained for 40 minutes at 40 degreeC with the 0.1% aqueous solution of the dichroic dye mix | blended in the ratio of 4: 3: 2: 2. This dyed polyvinyl alcohol film was uniaxially stretched in the machine direction in a boric acid bath at a draw ratio of 3.2 and dried at 90 ° C. for 4 minutes to obtain a polarizing element. Two films on which this polarizing element was applied to a thickness of 20 μm after drying an ultraviolet (UV) curable adhesive (6: 4 mixture of urethane acrylate and epoxy acrylate; manufactured by Nippon Kayaku Co., Ltd.) The film was sandwiched between 70 μm-thick polyarylate films (Elmec F-1100; manufactured by Kaneka Chemical Industry Co., Ltd.) and dried at 110 ° C. for 6 minutes after UV irradiation to obtain a polarizing plate of the present invention that was not annealed. This polarizing plate was heat-treated at 130 ° C. for 30 minutes to obtain an annealed polarizing plate of the present invention. The dimensional change before and after the annealing treatment was -0.13%. When this annealed polarizing plate was heated at 130 ° C. for 5 hours, which was the same as the heating conditions for cell production, the thermal shrinkage was −0.08%.
[0014]
Example 2
The polyvinyl alcohol film was swollen and then dyed with a dichroic dye. The dyed polyvinyl alcohol film was dried in a boric acid bath at a draw ratio of 3.6 and stretched at 90 ° C. for 4 minutes to obtain a polarizing element. This polarizing element was applied to a thickness of 20 μm after drying with an ultraviolet (UV) curable adhesive (urethane acrylate, 6: 2: 2 mixture of epoxy acrylate and polyester acrylate; manufactured by Nippon Kayaku Co., Ltd.). The film was sandwiched between the two polyarylate films and dried at 110 ° C. for 6 minutes after UV irradiation to obtain a polarizing plate of the present invention that was not annealed. This polarizing plate was heat-treated at 130 ° C. for 30 minutes to obtain an annealed polarizing plate of the present invention. The dimensional change before and after the annealing treatment was -0.26%. When this annealed polarizing plate was heated at 130 ° C. for 5 hours, which was the same as the heating conditions during cell production, the thermal shrinkage was −0.04%.
[0015]
Example 3
A polarizing element was obtained in the same manner as in Example 1. A UV curable adhesive (6: 4 mixture of urethane acrylate and epoxy acrylate; manufactured by Nippon Kayaku Co., Ltd.) is sandwiched between two polycarbonate films coated to a thickness of 20 μm after drying, 110 after UV irradiation The polarizing plate of the present invention which was dried at 6 ° C. for 6 minutes and was not annealed was obtained. This polarizing plate was heat-treated at 130 ° C. for 30 minutes to obtain an annealed polarizing plate of the present invention. The dimensional change before and after the annealing treatment was -0.23%. When this annealed polarizing plate was heated at 130 ° C. for 5 hours, which was the same as the heating conditions for cell production, the thermal shrinkage was −0.09%.
[0016]
Comparative Example 1
Except for the draw ratio, the same procedure as in Example 1 was performed. That is, after swelling a 70 μm-thick polyvinyl alcohol film, CI Direct Orange 39, CI Direct Red 81, Green Blue described in Example 23 of JP-A-59-145255, JP-A-3-78703 It dye | stained for 40 minutes at 40 degreeC with 0.1% aqueous solution of the dichroic dye which mix | blended blue by the ratio of 4: 3: 2: 2. This dyed polyvinyl alcohol film was uniaxially stretched in the longitudinal direction at a draw ratio of 4.0 in a boric acid bath and dried at 90 ° C. for 4 minutes to obtain a polarizing element. Two films on which this polarizing element was applied to a thickness of 20 μm after drying an ultraviolet (UV) curable adhesive (6: 4 mixture of urethane acrylate and epoxy acrylate; manufactured by Nippon Kayaku Co., Ltd.) The film was sandwiched between 70 μm-thick polyarylate films (Elmec F-1100; manufactured by Kaneka Chemical Industry Co., Ltd.) and dried at 110 ° C. for 6 minutes after UV irradiation to obtain a polarizing plate of the present invention that was not annealed. This polarizing plate was heat-treated (annealed) at 130 ° C. for 30 minutes. The dimensional change before and after the annealing treatment was −0.70%. When this annealed polarizing plate was heated at 130 ° C. for 5 hours, which was the same as the heating conditions for cell production, the thermal shrinkage was −0.18%.
[0017]
【The invention's effect】
By using the polarizing plate produced by the method of the present invention for a film cell, shrinkage caused by heat applied in the cell forming step can be suppressed, and an electrode pattern can be obtained with high accuracy. In addition, by integrating the polarizing plate and the cell, a film-like liquid crystal display cell with less warping and distortion due to heat and humidity can be obtained.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14219394A JP3731757B2 (en) | 1994-06-02 | 1994-06-02 | Manufacturing method of polarizing plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14219394A JP3731757B2 (en) | 1994-06-02 | 1994-06-02 | Manufacturing method of polarizing plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07333426A JPH07333426A (en) | 1995-12-22 |
| JP3731757B2 true JP3731757B2 (en) | 2006-01-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14219394A Expired - Fee Related JP3731757B2 (en) | 1994-06-02 | 1994-06-02 | Manufacturing method of polarizing plate |
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| Country | Link |
|---|---|
| JP (1) | JP3731757B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002365435A (en) * | 2001-04-03 | 2002-12-18 | Nitto Denko Corp | Method for manufacturing alignment film, polarizing film, polarizing plate and liquid crystal display device |
| TWI227768B (en) | 2002-10-29 | 2005-02-11 | Fujitsu Display Tech | Illumination device and liquid crystal display device using the same |
| EP2189496A4 (en) | 2007-08-31 | 2010-12-29 | Nippon Synthetic Chem Ind | Crosslinking agent, crosslinked polymer and their uses |
| JP2011253163A (en) * | 2010-06-04 | 2011-12-15 | Jsr Corp | Manufacturing method for polarizing film laminated body, polarizing film laminated body and touch panel including polarizing film laminated body |
-
1994
- 1994-06-02 JP JP14219394A patent/JP3731757B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07333426A (en) | 1995-12-22 |
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