JP2003139952A - Polarizing plate - Google Patents
Polarizing plateInfo
- Publication number
- JP2003139952A JP2003139952A JP2001336590A JP2001336590A JP2003139952A JP 2003139952 A JP2003139952 A JP 2003139952A JP 2001336590 A JP2001336590 A JP 2001336590A JP 2001336590 A JP2001336590 A JP 2001336590A JP 2003139952 A JP2003139952 A JP 2003139952A
- Authority
- JP
- Japan
- Prior art keywords
- adhesive
- film
- protective film
- polarizing plate
- polarizing
- 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.)
- Pending
Links
Landscapes
- Polarising Elements (AREA)
- Liquid Crystal (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は耐熱性に優れた偏光
板に関する。TECHNICAL FIELD The present invention relates to a polarizing plate having excellent heat resistance.
【０００２】[0002]
【従来の技術】近年、液晶表示素子（ＬＣＤ）は薄型表
示パネルとして、テレビ、車載用機器等その用途や使用
場所があらゆる場所に広がっているために、要求品質も
多岐にわたり大型化、高品質化、高耐久性化が進められ
ている。ＬＣＤとしては種々のタイプがあるが、二色性
染料やヨウ素をポリビニルアルコール（ＰＶＡ）フィル
ムに吸着させた後に、該ＰＶＡフィルムを延伸配向させ
て得られる偏光膜に保護フィルムを積層させた偏光板を
用いたＬＣＤが広く一般的に用いられている。上記偏光
板には偏光膜を引き裂きの力や湿度等の外力や外部環境
から保護する目的で両面にトリアセチルセルロース（Ｔ
ＡＣ）フィルムが貼り付けられている。しかし、ＴＡＣ
フィルムは水分を透過しやすいので、ＴＡＣを保護フィ
ルムに用いた偏光板は、湿度の高い環境に長時間置かれ
ると偏光板の偏光性能が劣化する。さらに偏光板が液晶
セルに粘着剤で貼り付けられた状態で高温環境下に置か
れたときには、ＬＣＤ画面の周囲が額縁状に色相が変化
し画質の低下を招く。特に黒を表示したときには画面の
周囲から光が漏れて白く見えるため、「白抜け」と表現
される問題が発生することがある。これらの問題点を解
決するために、特開平５−２１２８２８号公報には保護
フィルムとして熱可塑性ノルボルネン樹脂を用いて、耐
湿性を改善させる技術が開示されている。しかしなが
ら、特開平５−２１２８２８号公報では熱可塑性ノルボ
ルネンからなる保護膜とＰＶＡ系偏光膜とをアクリル粘
着剤を用いて積層しており、湿気による偏光性能低下に
は効果があるものの、高温環境下ではＰＶＡ系偏光膜が
収縮し、アクリル粘着層がその収縮を抑えきれないため
に「白抜け」が抑えられないばかりか剥がれが発生する
場合もある。2. Description of the Related Art In recent years, liquid crystal display devices (LCDs) are used as thin display panels for televisions, in-vehicle devices, and the like, and their applications and places of use have spread to various places. And higher durability are being promoted. Although there are various types of LCDs, a polarizing plate in which a protective film is laminated on a polarizing film obtained by adsorbing a dichroic dye or iodine on a polyvinyl alcohol (PVA) film and then stretching and orienting the PVA film LCDs using are widely used. The polarizing plate has triacetyl cellulose (T) on both sides for the purpose of protecting the polarizing film from external force such as tearing force and humidity and external environment.
AC) film is attached. But TAC
Since the film easily permeates moisture, the polarizing performance of the polarizing plate using TAC as a protective film deteriorates when it is placed in a high humidity environment for a long time. Furthermore, when the polarizing plate is attached to the liquid crystal cell with an adhesive and placed in a high temperature environment, the hue around the LCD screen changes like a frame, resulting in deterioration of image quality. In particular, when black is displayed, light leaks from the periphery of the screen and appears white, which may cause a problem called “white spot”. In order to solve these problems, Japanese Patent Application Laid-Open No. 5-212828 discloses a technique for improving moisture resistance by using a thermoplastic norbornene resin as a protective film. However, in Japanese Unexamined Patent Publication (Kokai) No. 5-212828, a protective film made of thermoplastic norbornene and a PVA-based polarizing film are laminated using an acrylic pressure-sensitive adhesive, which is effective in reducing polarization performance due to moisture, but under high temperature environment. Then, the PVA-based polarizing film shrinks, and the acrylic adhesive layer cannot fully suppress the shrinkage, so that not only "white spots" cannot be suppressed but also peeling may occur.
【０００３】[0003]
【発明が解決しようとする課題】本発明は、上記課題に
鑑みてなされたものであり、耐熱性が優れ、高温下にお
いても性能低下しない偏光板を提供する。The present invention has been made in view of the above problems, and provides a polarizing plate which has excellent heat resistance and does not deteriorate in performance even at high temperatures.
【０００４】[0004]
【課題を解決するための手段】本発明の偏光板は、全光
線透過率が８８％以上、光弾性係数が１.０×１０-11Ｐ
ａ-1以下及びガラス転移温度が１２０〜２００℃である
樹脂からなり厚さが１０〜１００μｍの保護フィルム
を、９０℃の貯蔵弾性率が５.０×１０5Ｐａ〜５.０×
１０9Ｐａである接着剤を用いて偏光膜に積層させてな
る偏光板である。The polarizing plate of the present invention has a total light transmittance of 88% or more and a photoelastic coefficient of 1.0 × 10 -11 P.
A protective film having a thickness of 10 to 100 μm and made of a resin having a −1 or less and a glass transition temperature of 120 to 200 ° C., and a storage elastic modulus at 90 ° C. of 5.0 × 10 5 Pa to 5.0 ×.
It is a polarizing plate laminated on a polarizing film using an adhesive having a pressure of 10 9 Pa.
【０００５】偏光膜は樹脂フィルムまたはシートからな
り、自然光を直線偏光に変える素子であれば特に限定さ
れるものでないが、高い偏光度を得られる点でＰＶＡフ
ィルムまたはシートからなる偏光膜が好ましく、例え
ば、ＰＶＡフィルムにヨウ素を吸着させた後、一軸延伸
し、更にホウ酸浴中で処理して得られるＰＶＡ−ヨウ素
系偏光膜、ＰＶＡフィルムに二色性の高い直接染料を拡
散吸着させた後、一軸延伸して得られるＰＶＡ−染料系
偏光膜、ＰＶＡフィルムを脱水反応してポリエン構造と
したポリエン系偏光膜などが挙げられる。The polarizing film is made of a resin film or sheet, and is not particularly limited as long as it is an element for converting natural light into linearly polarized light. However, a polarizing film made of a PVA film or sheet is preferable in that a high degree of polarization can be obtained. For example, after adsorbing iodine to a PVA film, uniaxially stretching, and further processing in a boric acid bath, a PVA-iodine-based polarizing film obtained, and after diffusing and adsorbing a highly dichroic direct dye to the PVA film Examples thereof include a PVA-dye-based polarizing film obtained by uniaxially stretching and a polyene-based polarizing film having a polyene structure obtained by dehydrating a PVA film.
【０００６】本発明に用いられる保護フィルムは少なく
とも偏光膜の片面に積層されていればよく、両面に積層
されていても良い。本発明の保護フィルムが片面のみに
積層されている場合、もう一方の面には、例えば、従来
公知のセルロース系樹脂、ポリエステル系樹脂、ポリカ
ーボネート系樹脂、ポリエーテルサルホン系樹脂、ポリ
アミド系樹脂、ポリイミド系樹脂等からなる光線透過率
の高い樹脂フィルムが適宜選択されて積層される。本発
明の保護フィルムに用いられる樹脂は全光線透過率が８
８％以上、光弾性係数が１.０×１０-11Ｐａ-1以下およ
びガラス転移温度が１２０〜２００℃である必要があ
る。保護フィルムの全光線透過率が８８％未満であると
偏光板をＬＣＤに貼付した場合、ＬＣＤ画面の輝度が不
十分となってしまう。光弾性係数が１.０×１０-11Ｐａ
-1を超えるとＬＣＤに貼付して耐久性試験を行った際に
コントラストが低下することがある。保護フィルムのガ
ラス転移温度が１２０℃未満であると、得られる保護フ
ィルムの耐熱性が不十分となって、耐久試験を行ったと
きに寸法変化が大きくなってしまいＬＣＤに利用した際
に画像の質が低下してしまう。逆に２００℃を超える
と、成形加工が困難になってしまうことがある。The protective film used in the present invention may be laminated on at least one surface of the polarizing film, and may be laminated on both surfaces. When the protective film of the present invention is laminated only on one surface, the other surface, for example, conventionally known cellulose resin, polyester resin, polycarbonate resin, polyether sulfone resin, polyamide resin, A resin film having a high light transmittance made of a polyimide resin or the like is appropriately selected and laminated. The resin used for the protective film of the present invention has a total light transmittance of 8
It must be 8% or more, a photoelastic coefficient of 1.0 × 10 -11 Pa -1 or less, and a glass transition temperature of 120 to 200 ° C. If the total light transmittance of the protective film is less than 88%, the brightness of the LCD screen will be insufficient when the polarizing plate is attached to the LCD. Photoelastic coefficient is 1.0 × 10 -11 Pa
If it exceeds -1 , the contrast may be lowered when it is attached to an LCD and subjected to a durability test. If the glass transition temperature of the protective film is less than 120 ° C, the heat resistance of the resulting protective film is insufficient, and the dimensional change becomes large when a durability test is performed, resulting in an image of an image when used in an LCD. The quality deteriorates. On the other hand, if the temperature exceeds 200 ° C, the molding process may become difficult.
【０００７】上記保護フィルムに用いられる樹脂として
は、上記の諸特性を兼備するものであれば如何なる樹脂
であっても良く、例えば、メタクリル酸メチルとアクリ
ル酸エステルの共重合体などのアクリル系樹脂、ノルボ
ルネンやジシクロペンタジエン及びこれらの誘導体を含
むノルボルネン系モノマーの開環重合体、付加重合体、
それらの水添物であるノルボルネン系樹脂に代表される
シクロオレフィン系樹脂、イソブテンなどのオレフィン
とｎ−アルキルマレイミドを共重合したオレフィン−マ
レイミド系樹脂等が挙げられる。これらの樹脂の中では
シクロオレフィン系樹脂が好ましく、特にノルボルネン
系樹脂は好適である。具体例としては、例えば、ＺＥＯ
ＮＥＸ（日本ゼオン社製）、ＺＥＯＮＯＲ（日本ゼオン
社製）、ＡＲＴＯＮ（ジェイエスアール社製）、ＯＰＴ
ＯＲＥＺ（日立化成工業社製）、ＡＰＥＬ（三井化学社
製）等が上市されている。The resin used for the protective film may be any resin having the above-mentioned various properties, for example, an acrylic resin such as a copolymer of methyl methacrylate and acrylate. , Norbornene and dicyclopentadiene, and ring-opening polymers and addition polymers of norbornene-based monomers including their derivatives,
Examples thereof include cycloolefin resins represented by norbornene resins which are hydrogenated products thereof, olefin-maleimide resins obtained by copolymerizing an olefin such as isobutene with n-alkylmaleimide, and the like. Of these resins, cycloolefin resins are preferable, and norbornene resins are particularly preferable. As a specific example, for example, ZEO
NEX (manufactured by Zeon Corporation), ZEONOR (manufactured by Zeon Corporation), ARTON (manufactured by JSR), OPT
OREZ (manufactured by Hitachi Chemical Co., Ltd.) and APEL (manufactured by Mitsui Chemicals, Inc.) are on the market.
【０００８】本発明で用いる樹脂には、必要に応じて、
フェノール系やリン系等の老化防止剤、フェノール系等
の熱劣化防止剤、アミン系等の帯電防止剤、脂肪族アル
コールのエステル化物、多価アルコールの部分エステル
化物及び部分エーテル化物等の滑剤、ベンゾフェノン
系、ベンゾトリアゾール系、アクリロニトリル系等の紫
外線吸収剤、フッ素系等のノニオン界面活性剤、特殊ア
クリル樹脂系、シリコーン系等のレベリング剤等の各種
添加剤が添加されていて良い。The resin used in the present invention, if necessary,
Antioxidants such as phenol and phosphorus, heat deterioration inhibitors such as phenol, antistatic agents such as amine, esterification products of aliphatic alcohols, lubricants such as partial esterification products and partial etherification products of polyhydric alcohols, Various additives such as a benzophenone-based, benzotriazole-based, acrylonitrile-based UV absorber, a fluorine-based nonionic surfactant, a special acrylic resin-based, a silicone-based leveling agent, and the like may be added.
【０００９】本発明の保護フィルムの製造方法としては
特に限定されず、一般的な溶液流延法、溶融成形法など
の公知の方法で製造される。溶液流延法は、バーコータ
ー、Ｔダイ、ドクターナイフ、メイアーバー、コンマコ
ーター等を用いて、保護フィルム用樹脂を溶剤に溶解し
た溶液を樹脂フィルム、スチールベルト、金属ドラムな
どの上に流延した後に、溶剤を乾燥除去してフィルムを
得る方法である。溶融成形法は、Ｔダイを用いた方法、
インフレーション法などの溶融押出法、カレンダー法、
熱プレス法、射出成型法などがある。The method for producing the protective film of the present invention is not particularly limited, and it can be produced by a known method such as a general solution casting method and a melt molding method. The solution casting method used a bar coater, a T-die, a doctor knife, a Mayer bar, a comma coater, etc. to cast a solution of a protective film resin dissolved in a solvent onto a resin film, a steel belt, a metal drum, or the like. After that, the solvent is dried and removed to obtain a film. The melt molding method is a method using a T die,
Melt extrusion method such as inflation method, calendar method,
There are a heat press method and an injection molding method.
【００１０】保護フィルムの厚さは１０〜１００μｍで
ある。フィルムの厚さが１０μｍ未満では十分な強度が
得られず、反対に１００μｍを超えると透明性が低下し
てしまう。保護フィルムには接着性を向上させるために
積層する前に表面処理を施すことが好ましい。表面処理
の方法としては特に限定されないが、コロナ放電処理、
紫外線照射処理などが好適に用いられ、表面処理を施す
ことにより表面のぬれ指数を、好ましくは４５×１０-5
Ｎ／ｃｍ以上、さらに好ましくは５０×１０-5Ｎ／ｃｍ
以上にするのが良い。なおぬれ指数とはＺｉｓｍａｎに
よる臨界表面張力を意味し、ＪＩＳ Ｋ−６７６８に基
づき標準ぬれ試薬で測定して求められる値である。The protective film has a thickness of 10 to 100 μm. When the thickness of the film is less than 10 μm, sufficient strength cannot be obtained, and when it exceeds 100 μm, the transparency is lowered. The protective film is preferably surface-treated before being laminated in order to improve the adhesiveness. The method of surface treatment is not particularly limited, corona discharge treatment,
UV irradiation treatment or the like is preferably used, and the surface wetting index is preferably 45 × 10 −5 by applying the surface treatment.
N / cm or more, more preferably 50 × 10 −5 N / cm
It is better to do above. The wetting index means the critical surface tension according to Zisman, and is a value obtained by measurement with a standard wetting reagent based on JIS K-6768.
【００１１】本発明に用いられる接着剤としては、９０
℃での貯蔵弾性率が５.０×１０5Ｐａ〜５.０×１０9Ｐ
ａであれば特に限定されないが、接着剤を塗布し、貼り
合わせ後に種々の化学反応により高分子量体または架橋
構造を形成する硬化型接着剤が好適に用いられる。具体
例としては、例えば、ウレタン系接着剤、エポキシ系接
着剤、水性高分子−イソシアネート系接着剤、熱硬化型
アクリル接着剤等の硬化型接着剤、湿気硬化ウレタン接
着剤、ポリエーテルメタクリレート型、エステル系メタ
クリレート型、酸化型ポリエーテルメタクリレート等の
嫌気性接着剤、シアノアクリレート系の瞬間接着剤、ア
クリレートとペルオキシド系の２液型瞬間接着剤等が挙
げられる。The adhesive used in the present invention is 90
Storage elastic modulus at ℃ 5.0 × 10 5 Pa ~ 5.0 × 10 9 P
Although it is not particularly limited as long as it is a, a curable adhesive that forms a high molecular weight substance or a crosslinked structure by various chemical reactions after application of the adhesive and bonding is preferably used. As specific examples, for example, urethane-based adhesives, epoxy-based adhesives, water-based polymer-isocyanate-based adhesives, curable adhesives such as thermosetting acrylic adhesives, moisture-curable urethane adhesives, polyether methacrylate-type adhesives, Examples thereof include anaerobic adhesives such as ester-based methacrylate type and oxidized polyether methacrylate, cyanoacrylate-based instant adhesives, and acrylate-peroxide-based two-component instant adhesives.
【００１２】上記接着剤としては１液型であっても良い
し、使用前に２液以上を混合して使用する型であっても
良い。また上記接着剤は有機溶剤を媒体とする溶剤系で
あってもよいし、水を主成分とする媒体であるエマルジ
ョン型、コロイド分散液型、水溶液型などの水系であっ
てもよいし、無溶剤型であってもよい。上記接着剤液の
濃度は、接着後の膜厚、塗布機、塗布条件等により適宜
決定されば良く、通常は０.１〜５０重量％である。The above-mentioned adhesive may be a one-component type or a type in which two or more types are mixed before use. In addition, the adhesive may be a solvent-based medium having an organic solvent as a medium, or may be a water-based medium such as an emulsion type, a colloidal dispersion type, or an aqueous solution type having a water-based main component. It may be a solvent type. The concentration of the adhesive solution may be appropriately determined depending on the film thickness after adhesion, the coating machine, the coating conditions, etc., and is usually 0.1 to 50% by weight.
【００１３】上記接着剤の９０℃での貯蔵弾性率は５.
０×１０5Ｐａ〜５.０×１０9Ｐａであり、好ましくは
１.０×１０6〜１.０×１０9Ｐａである。上記接着剤の
弾性率が５.０×１０5Ｐａ未満であると、十分な接着強
度が得られず耐熱試験をしたときに剥がれが発生し、弾
性率が５.０×１０9Ｐａを超えると、接着剤が硬すぎる
ために打ち抜き加工の際に、ひび割れや切りくずが発生
する不具合が起きる。上記接着剤の９０℃の貯蔵弾性率
とは動的粘弾性測定により得られる値であり、具体的に
は後述の〔貯蔵弾性率測定方法〕の項に記された方法に
より測定される値である。 上記接着層の硬化後の厚さ
は０.００５〜５０μｍが好ましく、更に好ましくは０.
０１〜１０μｍである。０.００５μｍ未満であると十
分な接着力が得られず、５０μｍを超えると耐湿試験の
際に偏光板の退色が起越すことがある。The storage elastic modulus of the above adhesive at 90 ° C. is 5.
It is 0 × 10 5 Pa to 5.0 × 10 9 Pa, preferably 1.0 × 10 6 to 1.0 × 10 9 Pa. If the elastic modulus of the above-mentioned adhesive is less than 5.0 × 10 5 Pa, sufficient adhesive strength cannot be obtained and peeling occurs in a heat resistance test, and the elastic modulus exceeds 5.0 × 10 9 Pa. As a result, the adhesive is too hard, causing cracks and chips during punching. The storage elastic modulus at 90 ° C. of the adhesive is a value obtained by dynamic viscoelasticity measurement, and specifically, a value measured by the method described in the section [Storage elastic modulus measurement method] described below. is there. The thickness of the adhesive layer after curing is preferably 0.005 to 50 μm, more preferably 0.005 μm.
It is from 01 to 10 μm. If it is less than 0.005 μm, sufficient adhesive force cannot be obtained, and if it exceeds 50 μm, discoloration of the polarizing plate may occur during the humidity resistance test.
【００１４】本発明の偏光板は保護フィルムもしくは偏
光膜の少なくとも一方の表面に接着剤層を形成した後
に、接着剤層を介して保護フィルムと偏光膜とを積層す
ることにより得られる。 上記接着層の形成方法として
は特に限定されず一般的方法、例えば、グラビアコータ
ー、マイクログラビアコーター、コンマコーター、バー
コーター等の方法で接着剤液を塗布する方法等が挙げら
れる。上記保護フィルムと偏光膜との積層は、通常のラ
ミネート法によって行われ、接着剤液を塗布した後に媒
体を乾燥除去させた後に積層するドライラミネート法、
媒体の一部を乾燥除去した後に積層し積層後に残りの媒
体を乾燥除去するセミドライラミネート法、接着剤を塗
布し積層した後に媒体を乾燥除去するウェットラミネー
ト法等が挙げられる。The polarizing plate of the present invention can be obtained by forming an adhesive layer on at least one surface of a protective film or a polarizing film and then laminating the protective film and the polarizing film via the adhesive layer. The method for forming the adhesive layer is not particularly limited, and a general method, for example, a method of applying an adhesive liquid by a method such as a gravure coater, a micro gravure coater, a comma coater, and a bar coater can be used. Lamination of the protective film and the polarizing film is carried out by a usual laminating method, and a dry laminating method in which the medium is dried and removed after applying the adhesive liquid, and then laminating.
Examples of the method include a semi-dry laminating method in which a medium is partially removed by drying and then laminated, and the remaining medium is dried and removed after laminating, a wet laminating method in which an adhesive is applied and laminated, and then the medium is dried and removed.
【００１５】本発明の偏光板は接着剤、粘着剤等を介し
て液晶セルに積層されて使用される。上記偏光板を液晶
セルに積層する際には、本発明の保護膜側が液晶セル側
になるように積層される。The polarizing plate of the present invention is used by being laminated on a liquid crystal cell via an adhesive, a pressure sensitive adhesive or the like. When the polarizing plate is laminated on the liquid crystal cell, the protective film side of the present invention is laminated on the liquid crystal cell side.
【００１６】（作用）本発明の偏光板は、耐熱試験を行
ったときにみられる偏光膜の収縮が、高い貯蔵弾性率の
接着層と高いＴｇの保護フィルムにより抑えられ、また
偏光膜の収縮応力が保護フィルムに負荷されても、保護
フィルムの光弾性係数が小さいために、複屈折が発生し
にくくなることの両作用により、高温環境下での偏光性
能の低下が抑えられると考えられる。(Function) In the polarizing plate of the present invention, the shrinkage of the polarizing film observed in the heat resistance test is suppressed by the adhesive layer having a high storage elastic modulus and the protective film having a high Tg, and the polarizing film shrinks. It is considered that even if stress is applied to the protective film, the photoelastic coefficient of the protective film is so small that birefringence is less likely to occur.
【００１７】[0017]
【実施例】以下に、実施例を示すが、本発明はこれによ
って制限されるものではない。
〔偏光膜の作製〕鹸化度９９モル％、厚さ７５μｍのＰ
ＶＡ未延伸フィルムを室温の水で洗浄した後、ヨウ素濃
度０.５ｗｔ％、ヨウ化カリウム濃度５ｗｔ％からなる
水溶液に浸漬してヨウ素を吸着させた。次に該ＰＶＡフ
ィルムを縦一軸に５倍延伸を行い、該フィルムの緊張状
態を保持したまま更にホウ酸濃度１０ｗｔ％、ヨウ化カ
リウム濃度１０ｗｔ％の５０℃水溶液中で５分間架橋処
理を行い偏光膜を得た。EXAMPLES Examples will be shown below, but the present invention is not limited thereto. [Production of Polarizing Film] P with a saponification degree of 99 mol% and a thickness of 75 μm
The VA unstretched film was washed with water at room temperature and then immersed in an aqueous solution having an iodine concentration of 0.5 wt% and a potassium iodide concentration of 5 wt% to adsorb iodine. Next, the PVA film was longitudinally uniaxially stretched 5 times and crosslinked for 5 minutes in a 50 ° C. aqueous solution having a boric acid concentration of 10 wt% and a potassium iodide concentration of 10 wt% while maintaining the tension state of the film, and polarizing. A film was obtained.
【００１８】〔保護フィルムの作製〕
（保護フィルム１）シクロオレフィン系樹脂１（商品
名：ＺＥＯＮＯＲ＃１６００Ｒ、日本ゼオン社製、Ｔｇ
＝１６８℃）を単軸押出機を用いて、幅６５０ｍｍのＴ
ダイから溶融押出し、２本構成の冷却ロールで巻き取る
ことにより、フィルムを作製した。この際のダイ部での
樹脂温度は２５０℃であった。得られたフィルムにコロ
ナ処理を施し保護フィルム１を得た。保護フィルム１の
厚さは５０μｍであり、濡れ指数は５９×１０-5Ｎ／ｃ
ｍであった。
（保護フィルム２）シクロオレフィン系樹脂２（商品
名：ＡＲＴＯＮ Ｇ６２、ジェイエスアール社製、Ｔｇ
＝１７１℃）を用いて３５ｗｔ％濃度のトルエン溶液を
調製した。得られた樹脂溶液をＰＥＴフィルム上にダイ
コーターを用いて塗布し、８０℃で乾燥後、ＰＥＴフィ
ルムから剥がした状態で１２０−１５０−１６５℃と段
階的に各８分ずつ乾燥してフィルムを作製した。得られ
たフィルムにコロナ処理を施し保護フィルム２を得た。
保護フィルム２の厚さは４０μｍであり、濡れ指数は６
０×１０-5Ｎ／ｃｍであった。
（保護フィルム３）市販の８０μｍのＴＡＣ（商品名：
フジタッククリアー、富士写真フィルム社製、光弾性係
数：１.２×１０-11Ｐａ-1）の鹸化処理したフィルムを
用いた。[Production of Protective Film] (Protective Film 1) Cycloolefin Resin 1 (Product Name: ZEONOR # 1600R, manufactured by Zeon Corporation, Tg
= 168 ° C.) using a single-screw extruder,
A film was prepared by melt-extruding from a die and winding with a two-roll cooling roll. At this time, the resin temperature in the die part was 250 ° C. Corona treatment was applied to the obtained film to obtain a protective film 1. The protective film 1 has a thickness of 50 μm and a wetting index of 59 × 10 −5 N / c.
It was m. (Protective film 2) Cycloolefin resin 2 (Product name: ARTON G62, manufactured by JRS, Tg
= 171 ° C.) to prepare a 35 wt% concentration toluene solution. The obtained resin solution was applied onto a PET film using a die coater, dried at 80 ° C., and then peeled off from the PET film and dried stepwise at 120-150 to 165 ° C. for 8 minutes each to form a film. It was made. Corona treatment was applied to the obtained film to obtain a protective film 2.
The protective film 2 has a thickness of 40 μm and a wetting index of 6
It was 0 × 10 −5 N / cm. (Protective film 3) Commercially available 80 μm TAC (trade name:
A film saponified by Fujitac Clear, manufactured by Fuji Photo Film Co., Ltd., having a photoelastic coefficient of 1.2 × 10 -11 Pa -1 was used.
【００１９】〔接着剤の調製〕
（接着剤Ａ）２液型の溶剤系ウレタン接着剤の主剤（品
番：ＴＭ−２２５Ａ、東洋モートン社製）と硬化剤（品
番：ＴＭ−２２５Ｂ、東洋モートン社製）を１：１に配
合し、酢酸エチルで１０ｗｔ％に希釈して用いた。
（接着剤Ｂ）２液型の水系ウレタン接着剤の主剤（品
番：ＥＬ−４３６Ａ、東洋モートン社製）と硬化剤（品
番：ＥＬ−４３６Ｂ、東洋モートン社製）を１０：３に
配合し、イオン交換水で１０ｗｔ％に希釈して用いた。
（接着剤Ｃ）水系アクリル接着剤の主剤（商品名：ディ
ックドライＷＳ−２０１Ａ、大日本インキ化学工業社
製）と硬化剤（商品名：ディックドライＬＪ５５、大日
本インキ化学工業社製）を１０：３に配合し、イオン交
換水で１０ｗｔ％に希釈して用いた。
（接着剤Ｄ）２液型の溶剤系ウレタン接着剤の主剤（品
番：ＴＭ−２２５Ａ、東洋モートン社製）と硬化剤（品
番：ＴＭ−２２５Ｂ、東洋モートン社製）を１００：１
に配合し、酢酸エチルで１０ｗｔ％に希釈して用いた。[Preparation of Adhesive] (Adhesive A) Main component (part number: TM-225A, manufactured by Toyo Morton) of a two-component solvent-based urethane adhesive and curing agent (part number: TM-225B, Toyo Morton) (Manufactured by Mitsui Chemical Co., Ltd.) was mixed at a ratio of 1: 1 and diluted to 10 wt% with ethyl acetate before use. (Adhesive B) A main component of a two-component water-based urethane adhesive (product number: EL-436A, manufactured by Toyo Morton) and a curing agent (product number: EL-436B, manufactured by Toyo Morton) are mixed at 10: 3, It was diluted to 10 wt% with deionized water and used. (Adhesive C) A water-based acrylic adhesive main agent (trade name: Dick Dry WS-201A, manufactured by Dainippon Ink and Chemicals, Inc.) and curing agent (trade name: Dick Dry LJ55, manufactured by Dainippon Ink and Chemicals, Inc.) 10 : 3 and diluted with ion-exchanged water to 10 wt% for use. (Adhesive D) The main component (part number: TM-225A, manufactured by Toyo Morton) of a two-component solvent-based urethane adhesive and the curing agent (part number: TM-225B, manufactured by Toyo Morton) are 100: 1.
And diluted with ethyl acetate to 10 wt% for use.
【００２０】実施例１
保護フィルム１のコロナ処理面に接着剤Ａ溶液をワイヤ
ーバー＃８で塗布し、８０℃のギアオーブンに１分間投
入し、溶剤を乾燥させた。偏光膜の片面に接着剤層を介
して保護フィルム１をゴム製の対ロールを備えたラミネ
ーターを用いて常温ラミネートした。さらに偏光膜のも
う一方の面に同様にして保護フィルム１を積層し、両面
に保護フィルム１が積層された偏光板を得た。得られた
偏光板を４０℃の恒温槽中で２日間養生して硬化させ
た。走査型電子顕微鏡（ＴＥＭ）を用いて得られた偏光
板の断面を観察して測定した接着層の厚みは４μｍであ
った。他方接着剤Ａの貯蔵弾性率を後述の方法で測定し
たところ９０℃での貯蔵弾性率は８.２×１０7Ｐａであ
った。Example 1 The adhesive A solution was applied to the corona-treated surface of the protective film 1 with a wire bar # 8 and put in a gear oven at 80 ° C. for 1 minute to dry the solvent. The protective film 1 was laminated on one surface of the polarizing film via an adhesive layer at room temperature using a laminator equipped with a pair of rubber rollers. Further, the protective film 1 was similarly laminated on the other surface of the polarizing film to obtain a polarizing plate in which the protective film 1 was laminated on both surfaces. The obtained polarizing plate was cured by curing in a constant temperature bath at 40 ° C. for 2 days. The thickness of the adhesive layer measured by observing the cross section of the polarizing plate obtained using a scanning electron microscope (TEM) was 4 μm. On the other hand, when the storage elastic modulus of the adhesive A was measured by the method described later, the storage elastic modulus at 90 ° C. was 8.2 × 10 7 Pa.
【００２１】実施例２
保護フィルム２のコロナ処理面に接着剤Ｂ溶液をワイヤ
ーバー＃８で塗布し、直ちにゴム製の対ロールを備えた
ラミネーターにより接着剤をしごきながら偏光膜とウェ
ットラミネートした。ウェットラミネートは偏光膜の片
面ずつ両面に行い、偏光膜の両面に保護フィルム２を積
層した。得られた偏光板を４５℃の恒温槽中で２日間乾
燥、養生して硬化させた。ＴＥＭを用いて、得られた偏
光板の断面を観察して測定した接着層の厚みは０.２μ
ｍであった。他方接着剤Ｂの貯蔵弾性率を後述の方法で
測定したところ９０℃での貯蔵弾性率は１.２×１０7Ｐ
ａであった。Example 2 The adhesive B solution was applied to the corona-treated surface of the protective film 2 with a wire bar # 8 and immediately wet-laminated with the polarizing film while squeezing the adhesive with a laminator equipped with a pair of rubber rollers. Wet lamination was performed on both sides of the polarizing film, and the protective film 2 was laminated on both sides of the polarizing film. The obtained polarizing plate was dried, cured and cured for 2 days in a constant temperature bath at 45 ° C. The thickness of the adhesive layer measured by observing the cross section of the obtained polarizing plate with a TEM is 0.2 μm.
It was m. On the other hand, when the storage elastic modulus of the adhesive B was measured by the method described below, the storage elastic modulus at 90 ° C. was 1.2 × 10 7 P
It was a.
【００２２】実施例３
保護フィルム２のコロナ処理面に接着剤Ｃ溶液をワイヤ
ーバー＃８で塗布し、直ちにゴム製の対ロールを備えた
ラミネーターにより接着剤をしごきながら偏光膜とウェ
ットラミネートした。ウェットラミネートは偏光膜の片
面づつ両面に行い、偏光膜の両面に保護フィルム２を積
層した。得られた偏光板を４５℃の恒温槽中で２日間乾
燥、養生して硬化させた。ＴＥＭを用いて、得られた偏
光板の断面を観察して測定した接着層の厚みは０.２μ
ｍであった。他方接着剤Ｂの貯蔵弾性率を後述の方法で
測定したところ９０℃での貯蔵弾性率は１.９×１０6Ｐ
ａであった。Example 3 The adhesive C solution was applied to the corona-treated surface of the protective film 2 with a wire bar # 8 and immediately wet-laminated with the polarizing film while squeezing the adhesive with a laminator equipped with a pair of rubber rollers. The wet lamination was performed on both sides of the polarizing film, and the protective film 2 was laminated on both sides of the polarizing film. The obtained polarizing plate was dried, cured and cured for 2 days in a constant temperature bath at 45 ° C. The thickness of the adhesive layer measured by observing the cross section of the obtained polarizing plate with a TEM is 0.2 μm.
It was m. On the other hand, when the storage elastic modulus of the adhesive B was measured by the method described later, the storage elastic modulus at 90 ° C. was 1.9 × 10 6 P
It was a.
【００２３】比較例１
保護フィルム２に接着剤Ｄ溶液をワイヤーバー＃８で塗
布し、８０℃のギアオーブンに１分間投入し、溶剤を乾
燥させた。偏光膜の片面に接着剤層を介して保護フィル
ム２をゴム製の対ロールを備えたラミネーターを用いて
常温ラミネートした。さらに偏光膜のもう一方の面に同
様にして保護フィルム２を積層し、両面に保護フィルム
２が積層された偏光板を得た。得られた偏光板を４０℃
の恒温槽中で２日間養生して硬化させた。ＴＥＭを用い
て、得られた偏光板の断面を観察して測定した接着層の
厚みは０.２μｍであった。他方接着剤Ｄの貯蔵弾性率
を後述の方法で測定したところ９０℃での貯蔵弾性率は
１.９×１０5Ｐａであった。Comparative Example 1 The adhesive D solution was applied to the protective film 2 with a wire bar # 8 and placed in a gear oven at 80 ° C. for 1 minute to dry the solvent. The protective film 2 was laminated on one surface of the polarizing film via an adhesive layer at room temperature using a laminator equipped with a pair of rubber rollers. Further, the protective film 2 was laminated on the other surface of the polarizing film in the same manner to obtain a polarizing plate in which the protective film 2 was laminated on both surfaces. The obtained polarizing plate is 40 ° C.
Was cured for 2 days in a constant temperature bath to cure. The thickness of the adhesive layer measured by observing the cross section of the obtained polarizing plate using TEM was 0.2 μm. On the other hand, when the storage elastic modulus of the adhesive D was measured by the method described later, the storage elastic modulus at 90 ° C. was 1.9 × 10 5 Pa.
【００２４】比較例２
保護フィルム３に接着剤（ＰＶＡ水溶液）をワイヤーバ
ー＃８で塗布し、直ちにゴム製の対ロールを備えたラミ
ネーターにより接着剤をしごきながら偏光膜とウェット
ラミネートした。ウェットラミネートは偏光膜の片面ず
つ両面に行い、偏光膜の両面に保護フィルム３を積層し
た。得られた偏光板を４５℃の恒温槽中で２日間乾燥さ
せた。ＴＥＭを用いて、得られた偏光板の断面を観察し
て測定した接着層の厚みは０.２μｍであった。Comparative Example 2 An adhesive (PVA aqueous solution) was applied to the protective film 3 with a wire bar # 8, and immediately wet-laminated with the polarizing film while squeezing the adhesive with a laminator equipped with a rubber counter roll. Wet lamination was performed on both sides of the polarizing film, and the protective films 3 were laminated on both sides of the polarizing film. The obtained polarizing plate was dried for 2 days in a constant temperature bath at 45 ° C. The thickness of the adhesive layer measured by observing the cross section of the obtained polarizing plate using TEM was 0.2 μm.
【００２５】〔貯蔵弾性率の測定方法〕下記の方法によ
り接着剤の貯蔵弾性率を測定した。
（サンプルの調製）上記で用いた接着剤をそれぞれ固形
分濃度が３０ｗｔ％になるよう溶解し接着剤配合液を調
整した。離型処理したＰＥＴ上に厚さ２ｍｍのＰＥＴ基
材粘着テープを用いて四角形になるよう溜部を作り、そ
こへ接着剤配合液を流し込み、８０℃のオーブン中で溶
剤が蒸発してなくなるまで乾燥させた。その後、乾燥し
た膜をＰＥＴ基材から剥がし取り、４５℃のオーブン中
で４８時間養生した後に幅４ｍｍ×長さ５０ｍｍに切り
出し、測定用サンプルとした。
（測定方法）粘弾性スペクトロメーター（ＤＶＡ−３２
０、ＩＴ計測制御社製）を用いて、昇温速度３℃/ｍｉ
ｎの条件下で、周波数３０Ｈｚの引っ張り変形を与えて
動的粘弾性を測定し、９０℃の貯蔵弾性率を求めた。[Measurement Method of Storage Elastic Modulus] The storage elastic modulus of the adhesive was measured by the following method. (Preparation of Sample) Each of the adhesives used above was dissolved to a solid content concentration of 30 wt% to prepare an adhesive compounding liquid. A 2 mm-thick PET base adhesive tape is used to form a square reservoir on the release-treated PET, and the adhesive compounding solution is poured into it until the solvent evaporates in the 80 ° C oven until it disappears. Dried. After that, the dried film was peeled off from the PET substrate, cured in an oven at 45 ° C. for 48 hours, and then cut into a piece having a width of 4 mm and a length of 50 mm to obtain a measurement sample. (Measurement method) Viscoelasticity spectrometer (DVA-32
0, manufactured by IT Measurement and Control Co., Ltd., using a heating rate of 3 ° C./mi
Under a condition of n, a dynamic deformation was measured by applying tensile deformation at a frequency of 30 Hz, and a storage elastic modulus at 90 ° C. was obtained.
【００２６】〔耐熱性試験〕耐熱試験後の「白抜け」現
象を、耐熱試験前後のクロスニコル状態での光線透過率
の変化のバラツキで評価した。すなわち、バラツキが大
きいほど「白抜け」が悪いことを意味する。
（サンプルの調製）実施例１〜３、比較例１，２で得た
偏光板の一方の面にアクリル粘着剤を積層して得た粘着
剤付き偏光板を吸収軸と辺が４５度をなすよう１００ｍ
ｍ×１００ｍｍの正方形に打ち抜き、２枚の偏光板を厚
さ２ｍｍのガラス板の両面にクロスニコルを示すように
アクリル粘着剤を介して貼り付けて、耐熱性試験用サン
プルとした。
（試験条件）上記サンプルを９０℃で２４０Ｈｒ加熱し
た。
（測定方法）サンプルの偏光板面内に図１のようにか
らまで測定点を決め、分光光度計（ＲＥＴＳ−２００
０、大塚電子社製）を使用し、Ｃ光源を用いて試験前後
の各位置における平行光線透過率を測定し、各測定点に
おける試験前後の平行光線透過率の差を求めた。次に変
化の起き易い点（、、、）の差の平均値と変化
の起き難い位置の差の平均値の差を透過率のバラツキと
して耐熱性の評価尺度とした。結果を表１に示した。[Heat Resistance Test] The “white spot” phenomenon after the heat resistance test was evaluated by the variation in the change of light transmittance in the crossed Nicols state before and after the heat resistance test. That is, the larger the variation is, the worse the “white spot” is. (Preparation of sample) The polarizing plate with an adhesive obtained by laminating an acrylic adhesive on one surface of each of the polarizing plates obtained in Examples 1 to 3 and Comparative Examples 1 and 2 has an absorption axis and a side of 45 degrees. So 100m
Punching into a square of m × 100 mm, two polarizing plates were pasted on both sides of a glass plate having a thickness of 2 mm with an acrylic pressure-sensitive adhesive so as to show crossed Nicols to obtain a heat resistance test sample. (Test conditions) The above sample was heated at 90 ° C for 240 hours. (Measurement method) As shown in FIG. 1, measurement points were determined in the plane of the polarizing plate of the sample, and the spectrophotometer (RETS-200) was used.
0, manufactured by Otsuka Electronics Co., Ltd.) was used to measure the parallel light transmittance at each position before and after the test using a C light source, and the difference in the parallel light transmittance before and after the test at each measurement point was obtained. Next, the difference between the average value of the differences between the points (,,,) where changes are likely to occur and the average value of the differences between the positions where changes are unlikely to occur was used as the variation in the transmittance and used as a heat resistance evaluation scale. The results are shown in Table 1.
【００２７】[0027]
【表１】 [Table 1]
【００２８】[0028]
【発明の効果】本発明の偏光板は上記の構成から成って
いるので、保護フィルムの優れた光学特性と耐熱性、接
着層の優れた物理的強度により、耐久試験を行ってもＬ
ＣＤの表示特性が劣化し難い偏光板を得ることができ
る。EFFECTS OF THE INVENTION Since the polarizing plate of the present invention has the above-mentioned constitution, it is L even if a durability test is conducted due to the excellent optical characteristics and heat resistance of the protective film and the excellent physical strength of the adhesive layer.
It is possible to obtain a polarizing plate in which the display characteristics of a CD are less likely to deteriorate.
【００２９】[0029]
【図１】 光線透過率の測定位置を示す図。FIG. 1 is a diagram showing measurement positions of light transmittance.
Claims (2)
が１.０×１０-11Ｐａ -1以下及びガラス転移温度が１２
０〜２００℃である樹脂からなり厚さが１０〜１００μ
ｍの保護フィルムが、９０℃の貯蔵弾性率が５×１０5
Ｐａ〜５×１０9Ｐａである接着剤により偏光膜に積層
されてなることを特徴とする偏光板。1. A total light transmittance of 88% or more and a photoelastic coefficient.
Is 1.0 × 10-11Pa -1Below and glass transition temperature is 12
Made of resin that is 0 to 200 ° C and has a thickness of 10 to 100μ
m has a storage elastic modulus of 5 × 10 at 90 ° C.Five
Pa ~ 5 x 109Laminating on a polarizing film with an adhesive that is Pa
A polarizing plate characterized by being formed.
からなることを特徴とする請求項１記載の偏光板。2. The polarizing plate according to claim 1, wherein the protective film is made of a cycloolefin resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001336590A JP2003139952A (en) | 2001-11-01 | 2001-11-01 | Polarizing plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001336590A JP2003139952A (en) | 2001-11-01 | 2001-11-01 | Polarizing plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003139952A true JP2003139952A (en) | 2003-05-14 |
Family
ID=19151388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001336590A Pending JP2003139952A (en) | 2001-11-01 | 2001-11-01 | Polarizing plate |
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| JP (1) | JP2003139952A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006058718A (en) * | 2004-08-23 | 2006-03-02 | Lintec Corp | Pressure sensitive adhesive composition for polarizing film |
| JP2009109995A (en) * | 2007-10-12 | 2009-05-21 | Sumitomo Chemical Co Ltd | Polarizing plate and liquid crystal display apparatus using the same |
| WO2009087942A1 (en) * | 2008-01-08 | 2009-07-16 | Sumitomo Chemical Company, Limited | Polarizer |
| JP2011017820A (en) * | 2009-07-08 | 2011-01-27 | Sumitomo Chemical Co Ltd | Polarizing plate and layered optical member including the same |
| JP2011081810A (en) * | 2009-10-09 | 2011-04-21 | Lg Chem Ltd | Integrated touch polarizing plate and touch panel including the same |
| JP2012003269A (en) * | 2005-03-31 | 2012-01-05 | Nippon Shokubai Co Ltd | Polarizer protective film, polarizing plate, and image display device |
| JP2018025772A (en) * | 2016-07-28 | 2018-02-15 | 住友化学株式会社 | Polarizing plate |
-
2001
- 2001-11-01 JP JP2001336590A patent/JP2003139952A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006058718A (en) * | 2004-08-23 | 2006-03-02 | Lintec Corp | Pressure sensitive adhesive composition for polarizing film |
| JP4705768B2 (en) * | 2004-08-23 | 2011-06-22 | リンテック株式会社 | Pressure sensitive adhesive composition for polarizing film |
| JP2012003269A (en) * | 2005-03-31 | 2012-01-05 | Nippon Shokubai Co Ltd | Polarizer protective film, polarizing plate, and image display device |
| JP2009109995A (en) * | 2007-10-12 | 2009-05-21 | Sumitomo Chemical Co Ltd | Polarizing plate and liquid crystal display apparatus using the same |
| WO2009087942A1 (en) * | 2008-01-08 | 2009-07-16 | Sumitomo Chemical Company, Limited | Polarizer |
| JP2011017820A (en) * | 2009-07-08 | 2011-01-27 | Sumitomo Chemical Co Ltd | Polarizing plate and layered optical member including the same |
| JP2011081810A (en) * | 2009-10-09 | 2011-04-21 | Lg Chem Ltd | Integrated touch polarizing plate and touch panel including the same |
| JP2018025772A (en) * | 2016-07-28 | 2018-02-15 | 住友化学株式会社 | Polarizing plate |
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