JP3401682B2 - Protective film for polarizing plate - Google Patents
Protective film for polarizing plateInfo
- Publication number
- JP3401682B2 JP3401682B2 JP24094492A JP24094492A JP3401682B2 JP 3401682 B2 JP3401682 B2 JP 3401682B2 JP 24094492 A JP24094492 A JP 24094492A JP 24094492 A JP24094492 A JP 24094492A JP 3401682 B2 JP3401682 B2 JP 3401682B2
- Authority
- JP
- Japan
- Prior art keywords
- group
- protective film
- film
- polarizing plate
- heterocyclic ring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/043—Improving the adhesiveness of the coatings per se, e.g. forming primers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/0427—Coating with only one layer of a composition containing a polymer binder
-
- G02B1/105—
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/14—Protective coatings, e.g. hard coatings
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2329/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
- C08J2329/02—Homopolymers or copolymers of unsaturated alcohols
- C08J2329/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Polarising Elements (AREA)
Description
【発明の詳細な説明】
【0001】
【産業上の利用分野】本発明は偏光板用保護フィルムに
関し、特に接着性に優れた偏光板用保護フィルムに関す
る。
【0002】
【従来の技術】染色一軸延伸されたポリビニルアルコー
ル膜(PVA膜)の偏光子に、セルローストリアセテー
トフィルムを保護フィルムとして貼り合わせた偏光フィ
ルムは、広く液晶表示素子として、電卓の表示部、パソ
コンや液晶テレビ、自動車のディスプレイ等に利用され
ている。
【0003】之らディスプレイ素子の用途において、各
種環境下で高い信頼性と耐久性を発揮するために、偏光
子と保護フィルム間には強固な接着性が要求される。こ
の接着性を向上させる方法として、最も広く保護フィル
ムとして使用されるセルローストリアセテートフィルム
の場合、予めアルカリ液で表面のケン化処理を行い、し
かるのちにポリビニルアルコール系接着剤等で積層し偏
光フィルムとしている。
【0004】しかし、上記アルカリ処理は高濃度アルカ
リ液を使用するため、作業安全上、又環境保全の上で好
ましくなく、更にアルカリ処理によって、可塑剤のブリ
ードアウトや、ヘイズが高くなるなど品質を落とすおそ
れがある。
【0005】又、アルカリ処理の前に帯電防止加工や、
ハードコート加工などの機能性付与の加工を行うと、ア
ルカリ処理によってその効果が減殺されるため、保護フ
ィルムの機能性付与はアルカリ処理後に限定される等の
問題がある。
【0006】
【発明の目的】本発明の目的は第1にPVA膜と接着し
易い偏光板用保護フィルムを提供することにある。第2
に作業上安全で環境に悪影響を及ぼさない加工により接
着性の優れた偏光板用保護フィルムを提供することにあ
る。第3に生産性の良い高品質の接着性に優れた偏光板
用保護フィルムを提供することにある。
【0007】
【発明の構成】本発明の上記目的は以下の構成により達
成される。
【0008】染色一軸延伸されたポリビニルアルコール
から成る偏光子に隣接して接着された保護フィルムにお
いて、少なくとも偏光子と接着される面に、下記一般式
〔I〕で表される−COOM基含有共重合体化合物を、該保
護フィルムと親和性を有する溶媒に溶解し、設層した偏
光板用保護フィルム。
【0009】
【化2】
【0010】以下本発明を更に詳しく説明する。
【0011】本発明に使用される特定の−COOM基含有共
重合体化合物は上記一般式で示される。
【0012】
【0013】上記一般式〔I〕中、Aはビニル単量体、
Mは水素原子あるいはカチオンを表し、Rは−O−R′あ
るいは−N(R″)(R′)を表す。ここでR′はアルキル
基、アラルキル基、アリール基、異項環残基あるいは
R″と共同して異項環を形成するに必要な非金属原子、
R″は水素原子、低級アルキル基あるいはR′と共同し
て異項環を形成するに必要な非金属原子を表す。m,
p,q,rはそれぞれ各単量体のモル%を示す値であっ
て、mは40〜55、pは2〜55、qは10〜58、
rは0〜25であり、m+p+q+r=100である。
【0014】上記一般式においてビニル単量体としては
例えばスチレン、ニトロ基、弗素、塩素、臭素、クロル
メチル基、低級アルキル基等が置換されたスチレン、ビ
ニルメチルエーテル、ビニルエチルエーテル、ビニルク
ロルエチルエーテル、酢酸ビニル、クロル酢酸ビニル、
プロピオン酸ビニル、アクリル酸、メタクリル酸あるい
はイタコン酸等の不飽和酸、炭素数1〜5であって、非
置換あるいは塩素、フェニル基等を置換したアルキルア
クリレートあるいはアルキルメタアクリレート、フェニ
ルアクリレートあるいはフェニルメタアクリレート、ア
クリロニトリル、塩化ビニル、塩化ビニリデン、エチレ
ン、アクリルアミド、炭素数1〜5のアルキル基あるい
は塩素、フェニル基等を置換したアクリルアミド、ビニ
ルアルコール、クリシジルアクリレート、アクロレイン
等があり、好ましくはスチレン、置換基を有するスチレ
ン、酢酸ビニル、ビニルメチルエーテル、アルキルアク
リレート、アクリロニトリル等である。
【0015】また、上記式中のR′のアルキル基として
は、炭素数1〜24のものが好ましく、直鎖アルキル基、
分岐アルキル基、シクロアルキル基等のアルキル基のい
ずれでもよく、また該アルキル基は置換基を有していて
もよく、この置換基としてはヒドロキシ基、ヒドロキシ
カルボニル基、カチオンのオキシカルボニル基等で、特
に弗素のごときハロゲンが置換されたハロゲノアルキル
基またはハロゲノアルキルオキシアルキル基は望ましい
結果が得られ、このとき炭素数2〜18のハロゲノアルキ
ル基、ハロゲノアルキルオキシアルキル基またはハロゲ
ノシクロアルキル基であって、ハロゲン数は望ましくは
1〜37である。
【0016】
【0017】また、前記一般式〔I〕中のR′が前述の
ようなハロゲノアルキル基、あるいはハロゲノアルキル
オキシアルキル基のときには、好ましくは前記一般式
〔I〕中のRは−O−R′である。また、R′のフェニル
基のごときアリール基、あるいはベンジル基のごときア
ラルキル基は置換基を有していてもよく、この置換基と
しては、弗素・塩素・臭素等のハロゲン低級アルキル基
・ヒドロキシ基・ヒドロキシカルボニル基・カチオンの
オキシカルボニル基・ニトリル基・ニトロ基等が挙げら
れる。また、式中のR′の異項環またはR′とR″とで
形成する異項環は、酸素、イオウ、または窒素を含む飽
和あるいは不飽和の異項環であって、例えばアジリジン
・ピロール・ピロリジン・ピラゾール・イミダゾール・
イミダゾリン・トリアゾール・ピペリジン・ピペラジン
・オキサジン・モルホリン・チアジン等の異項環から選
択される異項環である。また式中Mのカチオンとして
は、例えばアンモニウムイオン、ナトリウムイオン、カ
リウムイオン、リチウムイオン等のカチオンである。
【0018】そして上記一般式で示される−COOM基含有
共重合体化合物は単独あるいは2種以上併用して用いら
れ、好ましくは平均分子量約500〜500,000(重量平均)
程度のものが用いられる。
【0019】このような本発明に使用する上記共重合体
化合物の代表的なものとしては、下記のものを挙げるこ
とができる。しかし本発明はこれらに限定されるもので
はない。
【0020】
【化5】【0021】
【化6】【0022】
【化7】【0023】
【化8】【0024】
【化9】【0025】本発明に使用される前記一般式で表される
−COOM基含有共重合体化合物は、公知の方法で合成され
る。即ち、無水マレイン酸共重合物は極く一般的な重合
物であることは周知の通りであり、これらの誘導体もそ
れらに適合するアルコールあるいはアミン類を無水マレ
イン酸共重合物に反応させれば簡単に得られ、また無水
マレイン酸単量体ニ適合するアルコールあるいはアミン
類を反応し精製したものを他のビニル単量体と共重合さ
せても得られる。また、ハロゲノアルキル・ハロゲノア
ルキルオキシアルキル等のアクリレート類は、ジャーナ
ル・オブ・ポリマー・サイエンス(Journal of Polymer
Science.15 515〜574(1955)あるいは英国特許1,121,
357号明細書に記載されている単量体及び重合体の合成
法によって容易に合成される。
本発明にかかる、前記共重合体化合物の使用量は、10〜
1000mg/m2であることが好ましく、更には20〜300mg/m2
であることが特にこのましい。
【0026】本発明において使用される保護フィルム
は、セルローストリアセテートが主であるが、セルロー
スジアセテート,セルロースアセテートブチレート,セ
ルロースプロピオネートなどのセルロースエステル,ポ
リカーボネート,ポリエチレンテレフタレート,ポリア
クリレートなども適用できる。厚みは特に制限はない
が、機能上および取扱い易さから10〜500μm、特に30〜
300μmが好ましい。保護フィルムには所望により紫外線
吸収剤、可塑剤、滑り剤、マット剤等を含有させてもよ
い。
【0027】又、本発明に係るポリマー溶液はグラビア
コーター、ディプコーター、リバースロールコーター、
押し出しコーターなど公知の方法で塗布できる。本発明
に係るポリマーの付量は10〜1000mg/m2の範囲であり、
特に安定な接着力、塗布後の仕上り性からみると20〜30
0mg/m2が好ましい。該塗布液を塗布した後乾燥する方法
としては特に制限はないが乾燥後の残留溶媒量は5wt%
以下とするのが好ましい。残留溶媒量が多いと、偏光子
と積層された後の乾燥過程で接着界面に気泡を生じる場
合があり好ましくない。
【0028】本発明に係るポリマー溶液には所望により
紫外線吸収剤、滑り剤、マット剤、帯電防止剤、架橋
剤、及び活性剤などを添加してもよい。
【0029】特に架橋剤は偏光子のポリビニルアルコー
ルフィルムとの接着を促進する上で好ましい。この様な
架橋剤としては、例えば多価のエポキシ化合物、アジリ
ジン化合物、イソシアネート化合物や、明バン、ホウ素
化合物などがあげられる。
【0030】本発明に係る保護フィルムの処理面と、偏
光子を貼り合わせるのに使用される接着剤としては例え
ばポリビニルアルコール、ポリビニルブチラールなどの
ポリビニルアルコール系接着剤や、ブチルアクリレート
などビニル系ラテックス等があげられる。
【0031】
【実施例】以下に本発明の実施例を示すが、本発明はこ
れらの実施態様に限定されるものではない。
【0032】実施例1
厚さ125μmのセルローストリアセテートフィルムの一方
の面に、下記組成の溶液を20g/m2の割合で塗布し、100
℃10分間乾燥した後、本発明に係るフィルムA,Bを得
た。
【0033】
【表1】
【0034】実施例2
厚さ100μmのポリカーボネートフィルムの一方の面に下
記組成の溶液を20g/m2の割合で塗布し、100℃
10分間乾燥した後、本発明に係るフィルムCを得た。
【0035】
【表2】
【0036】実施例3
実施例1で得られた試料フィルムの未処理面に帯電防止
剤として、カチオン活性剤(LATANAC-SN,アメリカンシ
アナミド社製)を含む下記組成の溶液を20g/m2の割合で
塗布し、100℃10分間乾燥して、本発明に係るフィルム
Dを得た。
【0037】
【表3】
【0038】比較試料フィルム
厚さ125μmのセルローストリアセテートフィルムをフィ
ルムE、厚さ100μmのポリカーボネートフィルムをフィ
ルムF、フィルムEの偏光子と接着されない片面に実施
例3で示される帯電防止加工のみを施したフィルムをG
とする。
【0039】更にフィルムDおよびフィルムEを15wt%
のカセイソーダ溶液中に70℃180秒間浸漬し、水洗後乾
燥して得られたフィルムをそれぞれ試料フィルムH,I
とする。
【0040】次に実施例1〜実施例3および比較試料フ
ィルムのすべての試料,フィルムA,B,C,D,E,
F,G,HおよびIを用いて接着テストを行った。又同
時に光線透過率と、フィルムD,E,F,G,Hおよび
Iについてはその表面比抵抗を測定した。
【0041】結果は以下表4に示す。
【0042】〈評価項目及び方法、基準〉
〈接着力テスト〉幅3.5cm,長さ15cmの長方形の試料フ
ィルムに、ブチルアクリレートのラテックス(固形分20
wt%)を塗布し、試料フィルムと同サイズの一軸延伸さ
れたポリビニルアルコール染色フィルムと積層し、90℃
で3分間乾燥後24時間冷却放置したものを試料とする。
評価は試料の一端約3cmを予め接着剤を塗布せず空けて
おき、そこを起点にバネばかりで剥離力を求める。
【0043】(評価)
○:ラテックスが均一に塗れ、剥離力が500gr以上
×:ラテックスが部分的にハジキを生じ、剥離力が300g
r以下
50〜100gを△とする
50g未満を×とする
〈透過率〉試料フィルムを1枚、島津製作所(株)製M
PS−2000を用い、波長350〜700nmの範囲で測定し、そ
の時の透過率を%で表わす。
【0044】〈表面比抵抗〉試料フィルムを23℃,55%
RH雰囲気下で3時間以上調湿したのち同条件下で、川口
電機製作所(株)製の微小電流計MODEL VE−30にて測
定する。
【0045】
【表4】
【0046】上記表4の結果の如く、本発明の試料フィ
ルムのみが接着力に優れ、且つ光線透過率を損なわな
い。
【0047】E,F,Gは光線透過率は良いが接着力が
劣り、H,Iは接着力は良いが透過率が劣り、且つ帯電
防止性も大きく劣る。
【0048】
【発明の効果】本発明による偏光板用保護フィルムは偏
光フィルムに使用されるPVA膜と接着性が優れてお
り、作業上安全で環境に悪影響を及ぼさなく、生産性の
良好な高品質で接着性に優れたものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective film for a polarizing plate, and more particularly to a protective film for a polarizing plate having excellent adhesiveness. 2. Description of the Related Art A polarizing film in which a cellulose triacetate film is bonded to a polarizer of a dyed uniaxially stretched polyvinyl alcohol film (PVA film) as a protective film is widely used as a liquid crystal display element, a display section of a calculator, It is used for personal computers, liquid crystal televisions, and automobile displays. [0003] In applications of display elements, strong adhesion is required between the polarizer and the protective film in order to exhibit high reliability and durability under various environments. As a method for improving this adhesiveness, in the case of a cellulose triacetate film most widely used as a protective film, the surface is saponified in advance with an alkali solution, and then laminated with a polyvinyl alcohol-based adhesive or the like to form a polarizing film. I have. [0004] However, the above alkali treatment uses a high-concentration alkaline solution, which is not preferable in terms of work safety and environmental protection. In addition, the alkali treatment results in poor quality such as bleed out of the plasticizer and high haze. There is a risk of dropping. [0005] In addition, before the alkali treatment, antistatic treatment,
When a process for imparting functionality such as hard coating is performed, the effect is reduced by the alkali treatment, and thus there is a problem that the functional assignment of the protective film is limited after the alkali treatment. An object of the present invention is to provide a protective film for a polarizing plate which is easily adhered to a PVA film. Second
Another object of the present invention is to provide a protective film for a polarizing plate having excellent adhesiveness by a process which is safe in operation and does not adversely affect the environment. Third, it is an object of the present invention to provide a polarizing plate protective film having good productivity and high quality and excellent adhesiveness. The above object of the present invention is attained by the following constitutions. [0008] In a protective film bonded adjacent to a polarizer made of dyed uniaxially stretched polyvinyl alcohol, at least a surface bonded to the polarizer has a -COOM group-containing copolymer represented by the following general formula [I ]. the polymer compound is dissolved in a solvent having an affinity with the protective film, the coercive for設層the polarizing plate protecting film. [0009] Hereinafter, the present invention will be described in more detail. [0011] specific -COOM group-containing copolymer compounds to be used in the present invention is indicated above following general formula. In the above general formula [I] , A is a vinyl monomer ,
M represents a hydrogen atom or a cation , and R represents —O—R ′ or —N (R ″) (R ′) , wherein R ′ is an alkyl group, an aralkyl group, an aryl group, a heterocyclic residue or A non-metallic atom required to form a heterocyclic ring with R ″,
R "represents a hydrogen atom, a lower alkyl group or a nonmetal atom necessary for forming an heterocyclic ring in cooperation with R ' .
p, q, and r are values indicating mol% of each monomer, m is 40 to 55 , p is 2 to 55 , q is 10 to 58 ,
r is from 0 to 25 and an m + p + q + r = 10 0. In the above formula, examples of the vinyl monomer include styrene, nitro group, fluorine, chlorine, bromine, chloromethyl group, styrene substituted with a lower alkyl group and the like, vinyl methyl ether, vinyl ethyl ether, vinyl chloroethyl ether. , Vinyl acetate, vinyl chloroacetate,
Unsaturated acids such as vinyl propionate, acrylic acid, methacrylic acid or itaconic acid; alkyl acrylates or alkyl methacrylates having 1 to 5 carbon atoms and unsubstituted or substituted chlorine, phenyl, etc., phenyl acrylate or phenyl methacrylate There are acrylate, acrylonitrile, vinyl chloride, vinylidene chloride, ethylene, acrylamide, acrylamide substituted with an alkyl group having 1 to 5 carbon atoms or chlorine, phenyl group, etc., vinyl alcohol, chrysidyl acrylate, acrolein, etc. Styrene having a group, vinyl acetate, vinyl methyl ether, alkyl acrylate, acrylonitrile and the like. The alkyl group represented by R 'in the above formula is preferably an alkyl group having 1 to 24 carbon atoms.
The alkyl group may be any of an alkyl group such as a branched alkyl group and a cycloalkyl group, and the alkyl group may have a substituent. Examples of the substituent include a hydroxy group, a hydroxycarbonyl group, and a cationic oxycarbonyl group. Particularly, a halogenoalkyl group or a halogenoalkyloxyalkyl group substituted with halogen such as fluorine can obtain a desired result. In this case, a halogenoalkyl group having 2 to 18 carbon atoms, a halogenoalkyloxyalkyl group or a halogenocycloalkyl group is preferable. Thus, the halogen number is desirably from 1 to 37. [0016] Further, halogenoalkyl groups such as R 'are described above in the general formula (I) or when the halogenoalkyl alkyloxyalkyl group is, preferably R in general formula (I) -O −R ′. Further, such aryl groups phenyl group R 'or an aralkyl group such as benzyl group, it is rather good have a substituent, as the substituent, a halogen such as fluorine, chlorine, bromine lower alkyl, hydroxy Group, hydroxycarbonyl group, cationic oxycarbonyl group, nitrile group, nitro group and the like . Also, hetero ring formed De and R "'heterocyclic or R''R in the formula is an oxygen, a heterocyclic saturated or unsaturated containing sulfur or nitrogen, for example, aziridine- Pyrrole / pyrrolidine / pyrazole / imidazole /
It is a heterocycle selected from heterocycles such as imidazoline, triazole, piperidine, piperazine, oxazine, morpholine, and thiazine. Further, the cation of M in the formula is, for example, a cation such as an ammonium ion, a sodium ion, a potassium ion, and a lithium ion. The -COOM group-containing copolymer compound represented by the above general formula is used alone or in combination of two or more, and preferably has an average molecular weight of about 500 to 500,000 (weight average).
The degree is used. Typical examples of the above-mentioned copolymer compound used in the present invention include the following. However, the present invention is not limited to these. Embedded image Embedded image Embedded image Embedded image Embedded image The -COOM group-containing copolymer compound represented by the above general formula used in the present invention is synthesized by a known method. That is, it is well known that a maleic anhydride copolymer is an extremely general polymer, and these derivatives can also be obtained by reacting an alcohol or an amine compatible with them with the maleic anhydride copolymer. It can be easily obtained, or can be obtained by copolymerizing a purified product obtained by reacting an alcohol or an amine compatible with maleic anhydride monomer with another vinyl monomer. In addition, acrylates such as halogenoalkyl and halogenoalkyloxyalkyl are available from Journal of Polymer Science (Journal of Polymer Science).
Science. 15 515-574 (1955) or British Patent 1,121,
It can be easily synthesized by the method for synthesizing monomers and polymers described in the specification of Japanese Patent No. 357. According to the present invention, the amount of the copolymer compound used is 10 to
Is preferably 1000 mg / m 2, even 20 to 300 mg / m 2
It is particularly good to be. The protective film used in the present invention is mainly made of cellulose triacetate. However, cellulose esters such as cellulose diacetate, cellulose acetate butyrate and cellulose propionate, polycarbonate, polyethylene terephthalate, polyacrylate and the like can also be used. . The thickness is not particularly limited, but is 10 to 500 μm, particularly 30 to
300 μm is preferred. If necessary, the protective film may contain an ultraviolet absorber, a plasticizer, a slipping agent, a matting agent, and the like. The polymer solution according to the present invention may be a gravure coater, a dip coater, a reverse roll coater,
It can be applied by a known method such as an extrusion coater. Amount with the polymer according to the present invention is in the range of 10 to 1000 mg / m 2,
Especially stable adhesive strength and finish after application are 20-30
0 mg / m 2 is preferred. The method of drying after applying the coating solution is not particularly limited, but the amount of residual solvent after drying is 5 wt%.
It is preferable to set the following. If the amount of the residual solvent is large, air bubbles may be generated at the bonding interface during the drying process after lamination with the polarizer, which is not preferable. The polymer solution according to the present invention may optionally contain an ultraviolet absorber, a slipping agent, a matting agent, an antistatic agent, a crosslinking agent, an activator, and the like. Particularly, a cross-linking agent is preferable for promoting the adhesion of the polarizer to the polyvinyl alcohol film. Examples of such a cross-linking agent include a polyvalent epoxy compound, an aziridine compound, an isocyanate compound, a bright van and a boron compound. Examples of the adhesive used to bond the treated surface of the protective film according to the present invention to the polarizer include polyvinyl alcohol adhesives such as polyvinyl alcohol and polyvinyl butyral, and vinyl latex such as butyl acrylate. Is raised. The present invention will be described in more detail with reference to the following Examples, which by no means limit the present invention. Example 1 A solution having the following composition was applied at a rate of 20 g / m 2 to one surface of a cellulose triacetate film having a thickness of 125 μm,
After drying at 10 ° C. for 10 minutes, films A and B according to the present invention were obtained. [Table 1] Example 2 A solution having the following composition was applied at a rate of 20 g / m 2 to one surface of a polycarbonate film having a thickness of 100 μm.
After drying for 10 minutes, a film C according to the invention was obtained. [Table 2] Example 3 A solution having the following composition containing a cationic activator (LATANAC-SN, manufactured by American Cyanamid Co.) as an antistatic agent was applied to the untreated surface of the sample film obtained in Example 1 at 20 g / m 2 . The film was applied at a predetermined rate and dried at 100 ° C. for 10 minutes to obtain a film D according to the present invention. [Table 3] Comparative Sample Film A cellulose triacetate film having a thickness of 125 μm was applied to the film E, a polycarbonate film having a thickness of 100 μm was applied to the film F, and one side of the film E which was not bonded to the polarizer was subjected to only the antistatic treatment shown in Example 3. G film
And Further, the film D and the film E are added at 15 wt%.
Dipped in caustic soda solution at 70 ° C. for 180 seconds, washed with water and dried
And Next, all samples of Examples 1 to 3 and the comparative sample film, films A, B, C, D, E,
Adhesion tests were performed using F, G, H and I. At the same time, the light transmittance and the surface resistivity of the films D, E, F, G, H and I were measured. The results are shown in Table 4 below. <Evaluation Items, Methods and Criteria><AdhesionTest> A rectangular sample film having a width of 3.5 cm and a length of 15 cm was placed on a latex of butyl acrylate (solid content: 20%).
wt%), and laminated with a uniaxially stretched polyvinyl alcohol dyed film of the same size as the sample film, 90 ° C
The sample is dried for 3 minutes and left to cool for 24 hours to obtain a sample.
In the evaluation, about 3 cm of one end of the sample is left without applying an adhesive in advance, and the peeling force is obtained using the spring as a starting point. (Evaluation) :: Latex can be applied uniformly, peeling force is 500 gr or more. ×: Latex partially forms cissing, peeling force is 300 g.
r: 50 to 100 g, Δ: less than 50 g, ×: <Transmissivity> One sample film, M, manufactured by Shimadzu Corporation
The transmittance was measured in the range of 350 to 700 nm using PS-2000, and the transmittance at that time is represented by%. <Surface resistivity> A sample film was heated at 23 ° C. and 55%
After controlling the humidity for at least 3 hours in an RH atmosphere, the measurement is performed under the same conditions using a micro current meter MODEL VE-30 manufactured by Kawaguchi Electric Works, Ltd. [Table 4] As shown in Table 4, only the sample film of the present invention has excellent adhesive strength and does not impair the light transmittance. E, F, and G have good light transmittance but poor adhesive strength, and H and I have good adhesive strength but poor transmittance, and have very poor antistatic properties. The protective film for a polarizing plate according to the present invention has excellent adhesion to the PVA film used for the polarizing film, is safe in operation, does not adversely affect the environment, and has good productivity and high productivity. It is excellent in quality and adhesiveness.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平4−171403(JP,A) 特開 平3−130702(JP,A) 特開 昭59−111114(JP,A) 特開 昭58−171008(JP,A) 特開 平6−88907(JP,A) 特開 平6−88908(JP,A) (58)調査した分野(Int.Cl.7,DB名) G02B 5/30 ──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-4-171403 (JP, A) JP-A-3-130702 (JP, A) JP-A-59-111114 (JP, A) JP-A-58- 171008 (JP, A) JP-A-6-88907 (JP, A) JP-A-6-88908 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) G02B 5/30
Claims (1)
ルから成る偏光子に隣接して接着された保護フィルムに
おいて、少なくとも偏光子と接着される面に、下記一般
式〔I〕で表される−COOM基含有共重合体化合物を、該
保護フィルムと親和性を有する溶媒に溶解し、設層した
ことを特徴とする偏光板用保護フィルム。 【化1】 (式中、Aはビニル単量体、Mは水素原子あるいはカチ
オンを表し、Rは−O−R′あるいは−N(R″)(R′)を表
す。ここでR′はアルキル基、アラルキル基、アリール
基、異項環残基あるいはR″と共同して異項環を形成す
るに必要な非金属原子、R″は水素原子、低級アルキル
基あるいはR′と共同して異項環を形成するに必要な非
金属原子を表す。m,p,q,rはそれぞれ各単量体の
モル%を示す値であって、mは40〜55、pは2〜5
5、qは10〜58、rは0〜25であり、m+p+q
+r=100である。)(57) [Claim 1] In a protective film bonded adjacent to a polarizer made of dyed uniaxially stretched polyvinyl alcohol, at least a surface bonded to the polarizer has the following general formula [ A protective film for a polarizing plate, comprising: dissolving a -COOM group-containing copolymer compound represented by I ] in a solvent having an affinity for the protective film and forming a layer. Embedded image (Where A represents a vinyl monomer , M represents a hydrogen atom or a cation , and R represents -O-R 'or -N (R ") (R') .
You. Here, R 'is an alkyl group, an aralkyl group, an aryl group, a heterocyclic ring residue or a nonmetal atom necessary for forming an heterocyclic ring together with R ", and R" is a hydrogen atom, a lower alkyl group or Represents a nonmetallic atom necessary for forming a heterocyclic ring in cooperation with ' . m, p, q, and r are values indicating mol% of each monomer, where m is 40 to 55 and p is 2 to 5
5 and q are 10 to 58 , r is 0 to 25 , and m + p + q
A + r = 10 0. )
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24094492A JP3401682B2 (en) | 1992-09-09 | 1992-09-09 | Protective film for polarizing plate |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24094492A JP3401682B2 (en) | 1992-09-09 | 1992-09-09 | Protective film for polarizing plate |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0694915A JPH0694915A (en) | 1994-04-08 |
JP3401682B2 true JP3401682B2 (en) | 2003-04-28 |
Family
ID=17066977
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP24094492A Expired - Lifetime JP3401682B2 (en) | 1992-09-09 | 1992-09-09 | Protective film for polarizing plate |
Country Status (1)
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JP (1) | JP3401682B2 (en) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
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JP3619915B2 (en) * | 1996-01-26 | 2005-02-16 | コニカミノルタホールディングス株式会社 | Protective film for polarizing plate and polarizing plate |
US7252733B2 (en) | 2004-05-04 | 2007-08-07 | Eastman Kodak Company | Polarizer guarded cover sheet with adhesion promoter |
US7399376B2 (en) | 2004-05-04 | 2008-07-15 | Eastman Kodak Company | Polarizing plate laminated with an improved glue composition and a method of manufacturing the same |
US7655289B2 (en) | 2005-12-12 | 2010-02-02 | Eastman Kodak Company | Optical film composite having spatially controlled adhesive strength |
US7662456B2 (en) * | 2005-12-12 | 2010-02-16 | Eastman Kodak Company | Guarded cover sheet for LCD polarizers and method of making the same |
US7732007B2 (en) | 2005-12-19 | 2010-06-08 | Eastman Kodak Company | Method of making a polarizer plate |
KR101244996B1 (en) | 2005-12-26 | 2013-03-18 | 코니카 미놀타 어드밴스드 레이어즈 인코포레이티드 | Process for producing cellulose film, apparatus for producing cellulose film, optical film produced by said production apparatus, polarizing plate using said optical film, and liquid crystal display device |
JPWO2007125765A1 (en) | 2006-04-25 | 2009-09-10 | コニカミノルタオプト株式会社 | Polarizing plate protective film and manufacturing method thereof, polarizing plate, liquid crystal display device |
US20090246416A1 (en) | 2006-07-21 | 2009-10-01 | Konica Minolta Opto, Inc. | Optical film, method of manufacturing the same, polarizing plate, and liquid crystal display device |
EP2048525A4 (en) | 2006-07-31 | 2010-11-10 | Konica Minolta Opto Inc | Process for producing optical film, optical film, and polarization plate or image display unit utilizing the same |
JP5393249B2 (en) | 2008-05-15 | 2014-01-22 | 富士フイルム株式会社 | Cellulose ester film, retardation film, polarizing plate, and liquid crystal display device |
JP5243343B2 (en) * | 2009-02-03 | 2013-07-24 | 株式会社ジロオコーポレートプラン | Polarizer outer surface protective film, polarizing plate, and liquid crystal display element |
TWI417582B (en) * | 2009-02-03 | 2013-12-01 | Jiro Corporate Plan Inc | A polarizing element outer protective film, a polarizing film, and a liquid crystal display element |
KR20160086888A (en) * | 2013-12-27 | 2016-07-20 | 코니카 미놀타 가부시키가이샤 | Acrylic resin film and method for manufacturing same, polarizing plate protective film, and polarizing plate and liquid crystal display device including polarizing plate protective film |
KR20180000577A (en) * | 2016-06-23 | 2018-01-03 | 동우 화인켐 주식회사 | Polarizing Plate and Liquid Crystal Display Device Comprising the Same |
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1992
- 1992-09-09 JP JP24094492A patent/JP3401682B2/en not_active Expired - Lifetime
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JPH0694915A (en) | 1994-04-08 |
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