JPH07301792A - Optical film and liquid crystal display device - Google Patents
Optical film and liquid crystal display deviceInfo
- Publication number
- JPH07301792A JPH07301792A JP6115873A JP11587394A JPH07301792A JP H07301792 A JPH07301792 A JP H07301792A JP 6115873 A JP6115873 A JP 6115873A JP 11587394 A JP11587394 A JP 11587394A JP H07301792 A JPH07301792 A JP H07301792A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- optical film
- film
- sensitive adhesive
- optical
- 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
- Liquid Crystal (AREA)
- Adhesive Tapes (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Polarising Elements (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、加熱加湿雰囲気におい
ても発泡剥がれや光学特性の低下を生じにくい液晶表示
装置用の粘着剤層付設型の光学フィルム、及びそれを用
いた液晶表示装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure-sensitive adhesive layer-attached optical film for a liquid crystal display device, which is less likely to cause foam peeling and deterioration of optical properties even in a heated and humidified atmosphere, and a liquid crystal display device using the same.
【０００２】[0002]
【従来の技術】従来、液晶セルに貼着するための光学フ
ィルム素材、例えば偏光フィルムや位相差フィルム、あ
るいはそれらを積層した楕円偏光フィルムにアクリル系
粘着剤層等の種々の粘着剤層を設けてなる液晶表示装置
（ＬＣＤ）用の光学フィルムが提案されている。かかる
光学フィルムは、ＬＣＤ組立の効率化や品質のバラツキ
防止などを目的に液晶セル貼着用の粘着剤層を光学フィ
ルム素材に予め付設したものである。2. Description of the Related Art Conventionally, various pressure-sensitive adhesive layers such as an acrylic pressure-sensitive adhesive layer are provided on an optical film material for sticking to a liquid crystal cell, for example, a polarizing film or a retardation film, or an elliptically polarizing film obtained by laminating them. An optical film for a liquid crystal display (LCD) has been proposed. In such an optical film, a pressure-sensitive adhesive layer for adhering a liquid crystal cell is preliminarily attached to an optical film material for the purpose of improving the efficiency of LCD assembly and preventing variations in quality.
【０００３】前記のＬＣＤ用光学フィルムにあっては、
液晶セルに貼着した後においてもリワーク（再生作業）
性、製品加工時の切断加工性、保存性などに優れると共
に、ＬＣＤに実装した状態での加熱加湿処理の前後にお
いて発泡や剥がれを生じない耐湿熱性に優れ、かつ高温
雰囲気に置かれても光の透過率や位相差（リタデーショ
ン値：複屈折の屈折率差△ｎとフィルム厚ｄの積）等の
光学特性が低下しない光学機能維持性に優れることが要
求される。In the above optical film for LCD,
Rework (remanufacturing work) even after sticking to the liquid crystal cell
In addition to excellent heat resistance, cutting workability during product processing, storage stability, etc., it has excellent moist-heat resistance that does not cause foaming or peeling before and after heat-humidification treatment when mounted on an LCD, and even when placed in a high-temperature atmosphere It is required that the optical properties such as transmittance and retardation (retardation value: product of refractive index difference Δn of birefringence and film thickness d) are not deteriorated and the optical function maintainability is excellent.
【０００４】しかしながら、従来の光学フィルムにあっ
ては、前記の耐湿熱性と光学機能維持性を両立させにく
い問題点があった。すなわち従来の光学フィルムにあっ
ては、加熱加湿処理により発泡や剥がれを生じない耐湿
熱性の光学フィルムとした場合には、加熱処理で光透過
率や位相差等の光学特性が低下する光学機能維持性に乏
しいものとなり、その光学機能維持性に優れるものとし
た場合には加熱加湿処理で発泡や剥がれを生じる耐湿熱
性に乏しいものとなる問題点があった。However, in the conventional optical film, there is a problem that it is difficult to make the wet heat resistance and the optical function maintaining property compatible with each other. That is, in the conventional optical film, when it is a moisture-heat resistant optical film that does not cause foaming or peeling by heating and humidifying treatment, the optical function maintenance such that the optical characteristics such as light transmittance and phase difference are lowered by the heating treatment. When it is made excellent in its optical function maintenance property, there is a problem that it becomes poor in resistance to moist heat which causes foaming or peeling by heating and humidification.
【０００５】[0005]
【発明が解決しようとする課題】本発明は、加熱加湿処
理で発泡や剥がれを生じず、かつ高温雰囲気に置いても
光透過率や位相差等の光学特性が低下しにくい、リワー
ク性や切断加工性、保存性等と共に耐湿熱性と光学機能
維持性の両方にも優れる液晶表示装置用の光学フィルム
の開発を課題とする。DISCLOSURE OF THE INVENTION The present invention provides a reworking property and a cutting property in which foaming or peeling does not occur by heating and humidification, and optical characteristics such as light transmittance and phase difference are not easily deteriorated even when placed in a high temperature atmosphere. The objective is to develop an optical film for liquid crystal display devices, which is excellent not only in processability and storability but also in both moist heat resistance and optical function maintenance.
【０００６】[0006]
【課題を解決するための手段】本発明は、アルキル基の
炭素数が１〜９のアクリル酸アルキルエステルを７０〜
９９重量％含有するアクリル系共重合体を用いたアクリ
ル系粘着剤からなる、４００gf／cm2のズレ応力負荷時
のズレ速度に基づく凝集力が０．２μm／分以上の粘着
剤層を、液晶セルに貼着するための光学フィルム素材の
片面又は両面に設けたことを特徴とする液晶表示装置用
の光学フィルムを提供するものである。The present invention provides an acrylic acid alkyl ester having an alkyl group having 1 to 9 carbon atoms in an amount of 70 to
An acrylic pressure-sensitive adhesive layer composed of an acrylic pressure-sensitive adhesive containing an acrylic copolymer containing 99% by weight and having a cohesive force of 0.2 μm / min or more based on a shift rate under a shift stress load of 400 gf / cm 2 Provided is an optical film for a liquid crystal display, which is provided on one side or both sides of an optical film material to be attached to a cell.
【０００７】[0007]
【作用】本発明者は上記の課題を克服するために鋭意研
究を重ねる中で、光学フィルム素材に粘着剤層を付設し
たタイプの光学フィルムにおける耐湿熱性と光学機能維
持性に、意外にも粘着剤層の物性、特にその変形応力緩
和性としての凝集力が大きく関与することを究明し、こ
の知見を基に本発明をなすに至った。The present inventor, while earnestly conducting research to overcome the above-mentioned problems, surprisingly shows that the optical film material is provided with a pressure-sensitive adhesive layer for the moisture heat resistance and the optical function maintenance. It was clarified that the physical properties of the agent layer, in particular, the cohesive force as its deformation stress relaxation property are greatly involved, and the present invention was completed based on this finding.
【０００８】すなわち、上記した特定のアクリル酸アル
キルエステルを所定量含有するアクリル系共重合体を用
いた所定の凝集力を有する粘着剤層とすることにより、
リワーク性や切断加工性、保存性等を満足させつつ、耐
湿熱性と光学機能維持性の両方にも優れる液晶表示装置
用の光学フィルムを得ることができる。That is, a pressure-sensitive adhesive layer having a predetermined cohesive force is prepared by using an acrylic copolymer containing the above-mentioned specific alkyl acrylate in a predetermined amount.
It is possible to obtain an optical film for a liquid crystal display device which is excellent in both wet heat resistance and optical function maintenance while satisfying reworkability, cutting workability, storage stability and the like.
【０００９】上記の構成で耐湿熱性と光学機能維持性を
両立させうる理由は不明であるが、本発明者は液晶セル
との熱膨張差等に伴って光学フィルム素材に作用する応
力が、また応力によるガラス等のセル基板における位相
差の発生などが光学特性を低下させる原因であり、前記
の粘着剤層を介在させることでその応力が緩和されて光
学特性の低下が抑制され、かつかかる組成の粘着剤層が
熱や湿度で粘着特性を変化させいにくい物性を有してい
ることによるものと考えている。Although it is not clear why the above-mentioned constitution can achieve both wet heat resistance and optical function maintaining property, the present inventor found that the stress acting on the optical film material due to the difference in thermal expansion from the liquid crystal cell, The occurrence of a phase difference in a cell substrate such as glass due to stress is a cause of deteriorating the optical characteristics, and by interposing the pressure-sensitive adhesive layer, the stress is relieved and the deterioration of the optical characteristics is suppressed, and such composition It is believed that this is because the pressure-sensitive adhesive layer has a physical property that makes it difficult to change the pressure-sensitive adhesive property by heat or humidity.
【００１０】[0010]
【実施例】本発明の光学フィルムは、特定のアクリル酸
アルキルエステルを主成分とするアクリル系共重合体を
用いたアクリル系粘着剤からなる凝集力が０．２μm／
分以上の粘着剤層を、液晶セルに貼着するための光学フ
ィルム素材の片面又は両面に設けたものからなり、液晶
表示装置の形成に用いるものである。EXAMPLES The optical film of the present invention has a cohesive force of 0.2 μm / consisting of an acrylic pressure-sensitive adhesive using an acrylic copolymer mainly containing a specific alkyl acrylate.
The adhesive layer is provided on one side or both sides of an optical film material for sticking to a liquid crystal cell, and is used for forming a liquid crystal display device.
【００１１】本発明の光学フィルムの例を図１、図２に
示した。２が光学フィルム素材、３が粘着剤層である。
また図２において、２１は偏光フィルム、２２は位相差
フィルムであり、これらが粘着剤層３を介し積層されて
光学フィルム素材２としての楕円偏光フィルムが形成さ
れている。なお１は保護フィルム、４はセパレータであ
る。Examples of the optical film of the present invention are shown in FIGS. 2 is an optical film material, and 3 is an adhesive layer.
In FIG. 2, 21 is a polarizing film, 22 is a retardation film, and these are laminated through the pressure-sensitive adhesive layer 3 to form an elliptical polarizing film as the optical film material 2. In addition, 1 is a protective film and 4 is a separator.
【００１２】光学フィルム素材としては、例えば偏光フ
ィルムや位相差フィルム、あるいは偏光フィルムと位相
差フィルムを積層した楕円偏光フィルム、さらには反射
型偏光フィルムやそれを用いた前記楕円偏光フィルムな
どの液晶表示装置の形成に用いられるものが使用され、
その種類について特に限定はない。なお前記の楕円偏光
フィルムの如き積層タイプの光学フィルム素材の場合、
その積層に用いる接着手段としては、本発明における粘
着剤層が耐湿熱性や光学機能維持性等の点より好まし
い。As the optical film material, for example, a polarizing film, a retardation film, an elliptically polarizing film in which a polarizing film and a retardation film are laminated, and a reflective polarizing film or a liquid crystal display such as the elliptically polarizing film using the same. What is used to form the device is used,
There is no particular limitation on the type. In the case of a laminated type optical film material such as the elliptically polarizing film,
As the adhesive means used for the lamination, the pressure-sensitive adhesive layer in the present invention is preferable from the viewpoint of wet heat resistance and optical function maintenance.
【００１３】前記偏光フィルムの具体例としては、ポリ
ビニルアルコール系フィルム、部分ホルマール化ポリビ
ニルアルコール系フィルム、エチレン・酢酸ビニル共重
合体系部分ケン化フィルムの如き親水性高分子フィルム
にヨウ素及び／又は二色性染料を吸着させて延伸したも
の、ポリビニルアルコールの脱水処理物やポリ塩化ビニ
ルの脱塩酸処理物の如きポリエン配向フィルムなどがあ
げられる。偏光フィルムの厚さは通例５〜８０μmであ
るが、これに限定されない。Specific examples of the polarizing film include a hydrophilic polymer film such as a polyvinyl alcohol film, a partially formalized polyvinyl alcohol film, an ethylene / vinyl acetate copolymer partially saponified film, and iodine and / or dichroic dye. Examples thereof include those stretched by adsorbing a reactive dye, polyene oriented films such as dehydrated polyvinyl alcohol and dehydrochlorinated polyvinyl chloride. The polarizing film typically has a thickness of 5 to 80 μm, but is not limited thereto.
【００１４】なお反射型の偏光フィルムは、視認側（表
示側）からの入射光を反射させて表示するタイプの液晶
表示装置を形成するためのものであり、バックライト等
の光源の内蔵を省略できて液晶表示装置の薄型化をはか
りやすいなどの利点を有するものである。The reflective polarizing film is for forming a liquid crystal display device of the type that reflects incident light from the viewing side (display side) to display, and does not include a light source such as a backlight. The liquid crystal display device has the advantage that it can be easily made thin.
【００１５】反射型偏光フィルムの形成は、必要に応じ
透明樹脂層等を介して偏光フィルムの片面に金属等から
なる反射層を付設する方式などの適宜な方式で行うこと
ができる。前記の必要に応じて設けられる透明樹脂層
は、図例の如き保護フィルム１に兼ねさせることもで
き、従って上記の偏光フィルムとしては、その片側又は
両側に透明保護層を設けたものであってもよい。The reflective polarizing film can be formed by an appropriate method such as a method in which a reflective layer made of metal or the like is attached to one surface of the polarizing film via a transparent resin layer or the like, if necessary. The transparent resin layer provided as necessary can also serve as the protective film 1 as shown in the figure, and therefore the polarizing film has a transparent protective layer provided on one side or both sides thereof. Good.
【００１６】反射型偏光フィルムの具体例としては、必
要に応じマット処理した保護フィルム等の透明樹脂層の
片面に、アルミニウム等の反射性金属からなる箔や蒸着
膜を付設して反射層を形成したものなどがあげられる。
また前記の透明樹脂層に微粒子を含有させて表面微細凹
凸構造とし、その上に微細凹凸構造の反射層を設けたも
のなどもあげられる。なお反射層は、その反射面が透明
樹脂層や偏光フィルム等で被覆された状態の使用形態
が、酸化による反射率の低下防止、ひいては初期反射率
の長期持続の点や、保護層の別途付設の回避の点などよ
り好ましい。As a specific example of the reflection type polarizing film, a foil or a vapor deposition film made of a reflective metal such as aluminum is attached to one surface of a transparent resin layer such as a protective film which is mat-treated if necessary to form the reflection layer. The ones that have been made are listed.
Further, the transparent resin layer may be made to contain fine particles to form a surface fine uneven structure, and a reflective layer having a fine uneven structure may be provided thereon. The reflective layer is used in a state where the reflective surface is covered with a transparent resin layer, a polarizing film, or the like, to prevent deterioration of the reflectance due to oxidation, and thus to maintain the initial reflectance for a long period of time, or to attach a protective layer separately. Is more preferable in terms of avoidance.
【００１７】前記した微細凹凸構造の反射層は、入射光
を乱反射により拡散させて指向性やギラギラした見栄え
を防止し、明暗のムラを抑制しうる利点などを有する。
また微粒子含有の透明樹脂層は、入射光及びその反射光
がそれを透過する際に拡散させて明暗ムラをより抑制し
うる利点なども有している。透明樹脂層の表面微細凹凸
構造を反映させた微細凹凸構造の反射層の形成は、例え
ば真空蒸着方式、イオンプレーティング方式、スパッタ
リング方式等の蒸着方式やメッキ方式などの適宜な方式
で金属を透明樹脂層の表面に直接付設する方法などによ
り行うことができる。The above-mentioned reflective layer having a fine concavo-convex structure has the advantages that diffused incident light is diffused to prevent directivity and glare, and uneven brightness can be suppressed.
Further, the transparent resin layer containing fine particles has an advantage that incident light and reflected light thereof can be diffused when passing therethrough to further suppress uneven brightness. The reflective layer having a fine concavo-convex structure reflecting the surface fine concavo-convex structure of the transparent resin layer can be formed by transparentizing a metal by an appropriate method such as a vacuum evaporation method, an ion plating method, a sputtering method, or another vapor deposition method or a plating method. It can be performed by a method of directly attaching to the surface of the resin layer.
【００１８】なお保護フィルムや透明保護層の形成に
は、透明性、機械的強度、熱安定性、水分遮蔽性等に優
れるプラスチックなどが好ましく用いられる。その例と
しては、ポリエステル系樹脂、アセテート系樹脂、ポリ
エーテルサルホン系樹脂、ポリカーボネート系樹脂、ポ
リアミド系樹脂、ポリイミド系樹脂、ポリオレフィン系
樹脂、アクリル系樹脂や、アクリル系、ウレタン系、ア
クリルウレタン系、エポキシ系、シリコーン系等の熱硬
化型ないし紫外線硬化型樹脂などがあげられる。For the formation of the protective film and the transparent protective layer, plastics having excellent transparency, mechanical strength, thermal stability and moisture shielding property are preferably used. Examples thereof include polyester resin, acetate resin, polyether sulfone resin, polycarbonate resin, polyamide resin, polyimide resin, polyolefin resin, acrylic resin, acrylic resin, urethane resin, acrylic urethane resin. Examples thereof include thermosetting or ultraviolet curable resins such as epoxy resins and silicone resins.
【００１９】透明保護層は、プラスチックの塗布方式や
フィルムとしたものの積層方式などの適宜な方式で形成
してよく、厚さは適宜に決定してよい。一般には、５mm
以下、就中１mm以下、特に１〜５００μmである。なお
表面微細凹凸構造の透明樹脂層の形成に含有させる微粒
子としては、例えば平均粒径が０．５〜５μmのシリ
カ、アルミナ、チタニア、ジルコニア、酸化錫、酸化イ
ンジウム、酸化カドミウム、酸化アンチモン等の導電性
のこともある無機系微粒子や、架橋又は未架橋ポリマー
等の有機系微粒子などの透明樹脂層中で透明性を示すも
のが用いられる。微粒子の使用量は、透明樹脂１００重
量部あたり２〜２５重量部、就中５〜２０重量部が一般
的である。The transparent protective layer may be formed by an appropriate method such as a plastic coating method or a laminated method of a film, and the thickness may be appropriately determined. Generally 5 mm
Hereafter, it is preferably 1 mm or less, particularly 1 to 500 μm. Examples of the fine particles to be contained in the formation of the transparent resin layer having the surface fine uneven structure include silica, alumina, titania, zirconia, tin oxide, indium oxide, cadmium oxide and antimony oxide having an average particle size of 0.5 to 5 μm. Inorganic fine particles that may be electrically conductive, organic fine particles such as crosslinked or uncrosslinked polymer, and the like that exhibit transparency in a transparent resin layer are used. The amount of the fine particles used is generally 2 to 25 parts by weight, preferably 5 to 20 parts by weight, per 100 parts by weight of the transparent resin.
【００２０】上記した光学フィルム素材である位相差フ
ィルムの具体例としては、ポリカーボネート、ポリビニ
ルアルコール、ポリスチレン、ポリメチルメタクリレー
ト、ポリプロピレンやその他のポリオレフィン、ポリア
リレート、ポリアミドの如き適宜なプラスチックからな
るフィルムを延伸処理してなる複屈折性フィルムなどが
あげられる。位相差フィルムは、２種以上の位相差フィ
ルムを積層して位相差等の光学特性を制御したものとし
て形成することもできる。Specific examples of the retardation film which is the above-mentioned optical film material include a film made of a suitable plastic such as polycarbonate, polyvinyl alcohol, polystyrene, polymethylmethacrylate, polypropylene and other polyolefins, polyarylate and polyamide. Examples include a birefringent film obtained by treatment. The retardation film can be formed by laminating two or more kinds of retardation films and controlling optical properties such as retardation.
【００２１】上記した光学フィルム素材である楕円偏光
フィルム又は反射型楕円偏光フィルムは、偏光フィルム
又は反射型偏光フィルムと位相差フィルムを適宜な組合
せで積層したものであり、かかる楕円偏光フィルム等
は、（反射型）偏光フィルムと位相差フィルムの組合せ
となるようにそれらを液晶表示装置の製造過程で順次別
個に積層することによっても形成することができるが、
前記の如く予め楕円偏光フィルムとしたものは、品質の
安定性や積層作業性等に優れて液晶表示装置の製造効率
を向上させることができる。The elliptically polarizing film or the reflection type elliptically polarizing film which is the above-mentioned optical film material is obtained by laminating the polarizing film or the reflection type polarizing film and the retardation film in an appropriate combination. It can also be formed by sequentially laminating (reflective) polarizing film and retardation film separately in the process of manufacturing a liquid crystal display device so as to form a combination.
As described above, the elliptically polarizing film prepared beforehand has excellent quality stability and stacking workability, and can improve the manufacturing efficiency of the liquid crystal display device.
【００２２】なお偏光フィルム、位相差フィルム、保護
フィルムや透明保護層等の光学フィルム形成層は、例え
ばサリチル酸エステル系化合物、ベンゾフェノール系化
合物、ベンゾトリアゾール系化合物、シアノアクリレー
ト系化合物、ニッケル錯塩系化合物等の紫外線吸収剤で
処理する方式などにより紫外線吸収能をもたせることも
できる。The optical film forming layers such as the polarizing film, the retardation film, the protective film and the transparent protective layer may be, for example, salicylic acid ester compounds, benzophenol compounds, benzotriazole compounds, cyanoacrylate compounds, nickel complex salt compounds. It is also possible to impart ultraviolet absorption ability by a method of treating with an ultraviolet absorber such as.
【００２３】光学フィルム素材の片面又は両面に設ける
粘着剤層は、アルキル基の炭素数が１〜９のアクリル酸
アルキルエステルを７０〜９９重量％含有するアクリル
系共重合体を用いたアクリル系粘着剤により形成され、
４００gf／cm2のズレ応力負荷時のズレ速度に基づく凝
集力が０．２μm／分以上、就中０．３μm／分以上、特
に０．４〜３０μm／分のものとして形成される。The pressure-sensitive adhesive layer provided on one side or both sides of the optical film material is an acrylic pressure-sensitive adhesive using an acrylic copolymer containing 70 to 99% by weight of an alkyl acrylate whose alkyl group has 1 to 9 carbon atoms. Formed by the agent,
The cohesive force based on the displacement rate under a displacement stress of 400 gf / cm 2 is 0.2 μm / min or more, preferably 0.3 μm / min or more, and particularly 0.4 to 30 μm / min.
【００２４】前記の凝集力が０．２μm／分未満の粘着
剤層では、応力緩和性が不充分で加熱処理による光学特
性の低下が大きく光学機能維持性に乏しくなる。なお前
記の凝集力は、山本式凝集力測定装置を用いて、荷重２
００ｇ、温度２３℃の条件で３０分から１２０分の間の
ズレ速度を求めることにより得ることができる。In the pressure-sensitive adhesive layer having a cohesive force of less than 0.2 μm / min, the stress relaxation property is insufficient and the optical properties are largely deteriorated by heat treatment, resulting in poor optical function maintenance. The above-mentioned cohesive force was measured by using a Yamamoto-type cohesive force measuring device to measure the load 2
It can be obtained by obtaining the shift speed between 30 minutes and 120 minutes under the conditions of 00 g and a temperature of 23 ° C.
【００２５】前記の粘着剤層の形成に好ましく用いうる
アクリル系粘着剤は、アルキル基の炭素数が１〜９のア
クリル酸アルキルエステルの含有量が７０〜９９重量％
で、カルボキシル基又は／及びヒドロキシル基を有する
官能性モノマーの含有量が１〜３０重量％であり、重量
平均分子量が３０万〜１４０万のアクリル系共重合体と
架橋剤からなるものである。The acrylic pressure-sensitive adhesive that can be preferably used for forming the pressure-sensitive adhesive layer contains an alkyl acrylate whose alkyl group has 1 to 9 carbon atoms in an amount of 70 to 99% by weight.
The content of the functional monomer having a carboxyl group and / or a hydroxyl group is 1 to 30% by weight, and the acrylic copolymer having a weight average molecular weight of 300,000 to 1.4 million and a crosslinking agent are used.
【００２６】前記のアクリル系共重合体は、１種又は２
種以上のアルキル基の炭素数が１〜９のアクリル酸アル
キルエステルを７０〜９９重量％、１種又は２種以上の
カルボキシル基又は／及びヒドロキシル基を有する官能
性モノマーを１〜３０重量％の割合で用いて、溶液重合
方式、乳化重合方式、懸濁重合方式等の適宜な方式で調
製することができる。当該アクリル酸アルキルエステル
の組成比が前記範囲外では本発明の目的が達成されな
い。また当該官能性モノマーの組成比が前記範囲外では
耐湿熱性に乏しい場合がある。The above-mentioned acrylic copolymer may be one kind or two kinds.
70% to 99% by weight of an alkyl acrylate having 1 to 9 carbon atoms in one or more alkyl groups, 1% to 30% by weight of a functional monomer having one or two or more carboxyl groups and / or hydroxyl groups. When used in a ratio, it can be prepared by an appropriate method such as a solution polymerization method, an emulsion polymerization method or a suspension polymerization method. If the composition ratio of the alkyl acrylate is outside the above range, the object of the present invention cannot be achieved. If the composition ratio of the functional monomer is out of the above range, the heat and moisture resistance may be poor.
【００２７】前記においてアルキル基の炭素数が１〜９
のアクリル酸アルキルエステルとしては、例えばメチル
基、エチル基、ｎ−プロピル基、イソプロピル基、ｎ−
ブチル基、イソブチル基、アミル基、ヘキシル基、オク
チル基、２−エチルヘキシル基、イソノニル基の如き直
鎖型又は分岐型の炭素数が１〜９のアルキル基を有する
アクリル酸アルキルエステルなどが用いられる。In the above, the alkyl group has 1 to 9 carbon atoms.
Examples of the acrylic acid alkyl ester include, for example, methyl group, ethyl group, n-propyl group, isopropyl group, n-
Acrylic acid alkyl ester having a linear or branched alkyl group having 1 to 9 carbon atoms such as butyl group, isobutyl group, amyl group, hexyl group, octyl group, 2-ethylhexyl group and isononyl group is used. .
【００２８】官能性モノマーとしては、例えばアクリル
酸、メタクリル酸、イタコン酸、クロトン酸、イソクロ
トン酸、マレイン酸、無水マレイン酸の如きＣ＝Ｃ結合
を有する炭素数が３〜１０のカルボキシル基含有化合物
や、アクリル酸２−ヒドロキシエチル、メタクリル酸２
−ヒドロキシエチル、アクリル酸２−ヒドロキシプロピ
ル、メタクリル酸２−ヒドロキシプロピル、アリルアル
コールの如きＣ＝Ｃ結合を有する炭素数が２〜１０のヒ
ドロキシル基含有化合物などが用いられる。As the functional monomer, for example, acrylic acid, methacrylic acid, itaconic acid, crotonic acid, isocrotonic acid, maleic acid, maleic anhydride and the like, a compound having a C = C bond and a carboxyl group having 3 to 10 carbon atoms. Or 2-hydroxyethyl acrylate, methacrylic acid 2
-Hydroxyethyl, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, allyl alcohol and the like, a hydroxyl group-containing compound having a C = C bond and having 2 to 10 carbon atoms, and the like are used.
【００２９】官能性モノマーは、２個以上のカルボキシ
ル基又はヒドロキシル基を含有していてもよく、カルボ
キシル基とヒドロキシル基の両方を１個又は２個以上含
有していてもよい。また２個以上のカルボキシル基を含
有する化合物にあっては、無水物に変性されていてもよ
い。The functional monomer may contain two or more carboxyl groups or hydroxyl groups, and may contain one or more carboxyl groups and hydroxyl groups. Further, the compound containing two or more carboxyl groups may be modified into an anhydride.
【００３０】本発明において好ましく用いうる前記アク
リル系共重合体は、その重量平均分子量が３０万〜１４
０万のものである。その重量平均分子量が前記範囲外で
は耐湿熱性に乏しい場合がある。特に好ましいものは、
その重量平均分子量が３５万〜１３５万、就中４０万〜
１３０万のものである。The acrylic copolymer preferably used in the present invention has a weight average molecular weight of 300,000-14.
It's one hundred thousand. If the weight average molecular weight is outside the above range, the wet heat resistance may be poor. Particularly preferred is
Its weight average molecular weight is 350,000-1.35 million, especially 400,000-
1.3 million.
【００３１】アクリル系粘着剤の調製は、例えば前記ア
クリル系共重合体の含有液に架橋剤を配合する方式など
により行うことができる。配合する架橋剤としては、例
えばポリイソシアネート系架橋剤、エポキシ系架橋剤、
金属キレート系架橋剤、アミノ樹脂系架橋剤などの適宜
なものを用いうる。架橋剤の使用量は、所定の凝集力と
なるようアクリル系共重合体や架橋剤の種類に応じて適
宜に決定される。一般には、アクリル系共重合体１００
重量部あたり、０．１〜１５重量部、就中０．２〜１０
重量部、特に０．３〜５重量部の架橋剤が用いられる。The acrylic pressure-sensitive adhesive can be prepared, for example, by a method of adding a crosslinking agent to the liquid containing the acrylic copolymer. As the crosslinking agent to be blended, for example, polyisocyanate crosslinking agent, epoxy crosslinking agent,
Appropriate materials such as metal chelate-based crosslinking agents and amino resin-based crosslinking agents can be used. The amount of the cross-linking agent used is appropriately determined according to the types of the acrylic copolymer and the cross-linking agent so that a predetermined cohesive force is obtained. Generally, the acrylic copolymer 100
0.1 to 15 parts by weight, especially 0.2 to 10 parts by weight
Parts by weight, especially 0.3 to 5 parts by weight, of crosslinking agent are used.
【００３２】光学フィルム素材の片面又は両面への粘着
剤層の付設は、塗工方式やセパレータ上に設けたものの
移着方式などの適宜な方式で行ってよい。表面に露出す
る粘着剤層には、実用に供するまでの間その表面をセパ
レータ等で保護しておくことが好ましい。粘着剤層は、
上記した微粒子を含有させて光拡散型のものとすること
もできる。粘着剤層の厚さは、使用目的に応じて適宜に
決定してよく、一般には１〜５００μmとされる。The pressure-sensitive adhesive layer may be attached to one side or both sides of the optical film material by an appropriate method such as a coating method or a transfer method of the one provided on the separator. The surface of the pressure-sensitive adhesive layer exposed on the surface is preferably protected with a separator or the like until practical use. The adhesive layer is
It is also possible to incorporate the above-mentioned fine particles into a light diffusion type. The thickness of the pressure-sensitive adhesive layer may be appropriately determined depending on the purpose of use, and is generally 1 to 500 μm.
【００３３】なお本発明の光学フィルムの形成に際し
て、保護フィルム等の各種のフィルム素材の積層には上
記した光学フィルム素材に付設する粘着剤層に準じたも
のを使用することが、耐湿熱性や光学機能維持性等の点
より好ましい。When forming the optical film of the present invention, it is preferable to use various adhesives for the film, such as a protective film, according to the pressure-sensitive adhesive layer attached to the above-mentioned optical film material. It is preferable from the standpoint of function maintenance.
【００３４】本発明の光学フィルムは、液晶表示装置を
形成するためのものである。液晶表示装置の形成は、光
学フィルムをその粘着剤層を介して液晶セルの片側又は
両側に貼着することにより行うことができる。その貼着
に際しては、偏光フィルムや位相差フィルム等が所定の
配置位置となるように行われ、その配置位置は従来に準
じることができる。The optical film of the present invention is for forming a liquid crystal display device. The liquid crystal display device can be formed by adhering the optical film to one side or both sides of the liquid crystal cell via the adhesive layer. The sticking is performed so that the polarizing film, the retardation film, or the like is in a predetermined arrangement position, and the arrangement position can be based on the conventional method.
【００３５】ちなみに図３、図４に液晶表示装置におけ
る光学フィルムの配置例を示した。５が液晶セルであ
り、その他の符号は上記に準じる。なお図３に例示の装
置は、偏光フィルム２１に反射層２３を設けてなる反射
型のものであり、このように反射層は液晶セルの片側の
外側に配置される。Incidentally, FIG. 3 and FIG. 4 show examples of arrangement of optical films in a liquid crystal display device. Reference numeral 5 is a liquid crystal cell, and other reference numerals are the same as above. The device illustrated in FIG. 3 is of a reflective type in which the polarizing film 21 is provided with the reflective layer 23, and thus the reflective layer is arranged on the outside on one side of the liquid crystal cell.
【００３６】また図４に例示の装置は、位相差フィルム
２３を用いたものである。位相差フィルムは、着色防止
や視角範囲の拡大等を目的に液晶セルの位相差を補償す
るためなどに用いられる。その場合、偏光フィルムと積
層してなる楕円偏光フィルムとして用いることもでき
る。The apparatus illustrated in FIG. 4 uses the retardation film 23. The retardation film is used for compensating the retardation of the liquid crystal cell for the purpose of preventing coloring and expanding the viewing angle range. In that case, it can also be used as an elliptically polarizing film laminated with a polarizing film.
【００３７】本発明の光学フィルムは、柔軟性を有して
湾曲面や大面積面等への適用が容易であり、任意な液晶
セル、例えば薄膜トランジスタ型に代表されるアクティ
ブマトリクス駆動型のもの、ツイストネマチック型やス
ーパーツイストネマチック型に代表される単純マトリク
ス駆動型のものなどの適宜なタイプの液晶セルに適用し
て種々の液晶表示装置を形成することができる。The optical film of the present invention has flexibility and can be easily applied to a curved surface, a large area surface or the like, and any liquid crystal cell, for example, an active matrix driving type represented by a thin film transistor type, Various liquid crystal display devices can be formed by applying to a liquid crystal cell of an appropriate type such as a simple matrix drive type represented by a twist nematic type or a super twist nematic type.
【００３８】実施例１ ポリエステルフィルムからなるセパレータにアクリル系
粘着剤を塗工し１５０℃で５分間加熱処理して厚さ２３
μmの粘着剤層を設け、それを偏光フィルム（日東電工
社製、ＮＰＦ−Ｇ１２２５ＤＵＮＡＧＳ１）と、厚さ７
０μmのポリカーボネートフィルムを１６０℃にて一軸
延伸してなる位相差フィルムの片面にそれぞれ貼着した
のち、偏光フィルム側のセパレータを剥がしてその粘着
剤層を介し、偏光フィルムの吸収軸と位相差フィルムの
遅相軸が４５度で交差するよう積層して楕円偏光フィル
ムからなる光学フィルムを得た。Example 1 A separator made of polyester film was coated with an acrylic pressure-sensitive adhesive and heat-treated at 150 ° C. for 5 minutes to give a thickness of 23.
A pressure-sensitive adhesive layer having a thickness of 7 μm is provided, and a polarizing film (manufactured by Nitto Denko Corp., NPF-G1225DUNAGS1) and a thickness of 7 are provided.
A polycarbonate film of 0 μm was uniaxially stretched at 160 ° C. on each side of the retardation film, then the separator on the polarizing film side was peeled off, and the absorption axis of the polarizing film and the retardation film were put through the adhesive layer. Were laminated so that their slow axes intersected at 45 degrees to obtain an optical film composed of an elliptically polarizing film.
【００３９】なお前記のアクリル系粘着剤としては、撹
拌機、冷却管、温度計及び窒素導入管を備えた反応装置
に、アクリル酸ブチル７５部（重量部、以下同じ）、ア
クリル酸メチル２５部、アクリル酸３部、及びアクリル
酸２−ヒドロキシエチル０．０７部を、酢酸エチル４５
部と過酸化ベンゾイル０．２部と共に加えて窒素気流
下、６０℃で１５時間撹拌しながら反応させたのち、７
０℃に昇温して２時間反応させて反応を完結（重合率７
９％）させ、その反応液に酢酸エチルとトルエンを合計
量で２７０部加え、更にポリイソシアネート系架橋剤
（コロネートＬ、日本ポリウレタン社製）を固形分比で
０．６重量％加えて調製したものを用いた。なお、前記
反応で得られたアクリル系共重合体の重量平均分子量は
約１２０万であった。As the acrylic pressure-sensitive adhesive, 75 parts of butyl acrylate (weight part, the same applies hereinafter) and 25 parts of methyl acrylate were used in a reactor equipped with a stirrer, a cooling pipe, a thermometer and a nitrogen introducing pipe. , Acrylic acid 3 parts, and 2-hydroxyethyl acrylate 0.07 parts, ethyl acetate 45
And 0.2 part of benzoyl peroxide were added and reacted under a nitrogen stream at 60 ° C. for 15 hours while stirring.
The temperature is raised to 0 ° C and the reaction is allowed to proceed for 2 hours to complete the reaction (polymerization rate 7
9%), ethyl acetate and toluene were added to the reaction solution in a total amount of 270 parts, and a polyisocyanate-based crosslinking agent (Coronate L, manufactured by Nippon Polyurethane Co., Ltd.) was added in an amount of 0.6% by weight in terms of solid content. I used one. The weight average molecular weight of the acrylic copolymer obtained by the above reaction was about 1.2 million.
【００４０】実施例２ アクリル酸ブチル７１部、アクリル酸メチル２５部、及
びアクリル酸９部を、トルエン４５部と過酸化ベンゾイ
ル０．２部と共に加えて窒素気流下、６５℃で８時間撹
拌しながら反応させたのち、７５℃に昇温して２時間反
応させて反応を完結（重合率９２％）させ、その重量平
均分子量が約８０万のアクリル系共重合体を含む反応液
に酢酸エチルとトルエンを合計量で２７０部加え、更に
コロネートＬを固形分比で１重量％加えて調製したアク
リル系粘着剤を用いたほかは実施例１に準じて光学フィ
ルムを得た。Example 2 71 parts of butyl acrylate, 25 parts of methyl acrylate, and 9 parts of acrylic acid were added together with 45 parts of toluene and 0.2 part of benzoyl peroxide, and the mixture was stirred at 65 ° C. for 8 hours under a nitrogen stream. After the reaction, the temperature was raised to 75 ° C and the reaction was allowed to proceed for 2 hours to complete the reaction (polymerization rate 92%). Ethyl acetate was added to the reaction solution containing the acrylic copolymer having a weight average molecular weight of about 800,000. And an amount of 270 parts of toluene in total, and 1% by weight of solid content of Coronate L was used to prepare an acrylic pressure-sensitive adhesive, and an optical film was obtained according to Example 1.
【００４１】実施例３ アクリル酸ブチル９０部、及びアクリル酸１５部を、ト
ルエン４５部と過酸化ベンゾイル０．２部と共に加えて
窒素気流下、６５℃で８時間撹拌しながら反応させたの
ち、７５℃に昇温して２時間反応させて反応を完結（重
合率９５％）させ、その重量平均分子量が約５０万のア
クリル系共重合体を含む反応液に、コロネートＬを固形
分比で１．５重量％加えて調製したアクリル系粘着剤を
用いたほかは実施例１に準じて光学フィルムを得た。Example 3 90 parts of butyl acrylate and 15 parts of acrylic acid were added together with 45 parts of toluene and 0.2 part of benzoyl peroxide and reacted under a nitrogen stream at 65 ° C. for 8 hours with stirring. The temperature is raised to 75 ° C. and the reaction is completed for 2 hours to complete the reaction (polymerization rate: 95%), and Coronate L is added in a solid content ratio to a reaction liquid containing an acrylic copolymer having a weight average molecular weight of about 500,000. An optical film was obtained in the same manner as in Example 1 except that an acrylic pressure-sensitive adhesive prepared by adding 1.5% by weight was used.
【００４２】比較例１ コロネートＬの配合量（固形分比、以下同じ）を０．３
重量％としたアクリル系粘着剤を用いたほかは実施例１
に準じて光学フィルムを得た。Comparative Example 1 The compounding amount of Coronate L (solid content ratio, hereinafter the same) was 0.3.
Example 1 except that an acrylic pressure-sensitive adhesive was used in a weight percentage.
An optical film was obtained according to.
【００４３】比較例２ コロネートＬの配合量を１重量％としたアクリル系粘着
剤を用いたほかは実施例１に準じて光学フィルムを得
た。Comparative Example 2 An optical film was obtained in the same manner as in Example 1 except that an acrylic pressure-sensitive adhesive whose amount of Coronate L was 1% by weight was used.
【００４４】比較例３ コロネートＬの配合量を０．６重量％としたアクリル系
粘着剤を用いたほかは実施例２に準じて光学フィルムを
得た。Comparative Example 3 An optical film was obtained in the same manner as in Example 2 except that an acrylic pressure-sensitive adhesive having a Coronate L content of 0.6% by weight was used.
【００４５】比較例４ コロネートＬの配合量を１．５重量％としたアクリル系
粘着剤を用いたほかは実施例２に準じて光学フィルムを
得た。Comparative Example 4 An optical film was obtained in the same manner as in Example 2 except that an acrylic pressure-sensitive adhesive whose amount of Coronate L was 1.5% by weight was used.
【００４６】比較例５ コロネートＬの配合量を１重量％としたアクリル系粘着
剤を用いたほかは実施例３に準じて光学フィルムを得
た。Comparative Example 5 An optical film was obtained in the same manner as in Example 3 except that an acrylic pressure sensitive adhesive having a Coronate L content of 1% by weight was used.
【００４７】評価試験 凝集力 実施例、比較例における粘着剤層について、山本式凝集
力測定装置を用い荷重４００gf／cm2、温度２３℃の条
件で３０分から１２０分の間のズレ速度を求めて凝集力
を調べた。Evaluation Test Cohesive Strength With respect to the pressure-sensitive adhesive layers in Examples and Comparative Examples, a shift speed between 30 minutes and 120 minutes was calculated using a Yamamoto type cohesive force measuring device under the conditions of a load of 400 gf / cm 2 and a temperature of 23 ° C. The cohesive force was examined.
【００４８】耐熱性 実施例、比較例で得た粘着剤層付の偏光フィルム（200m
m×150mm）について、それをその粘着剤層を介してガラ
ス板に貼着し、９０℃の雰囲気中で２時間加熱後におけ
る発泡の有無を目視観察した。Heat resistance Polarizing films with pressure-sensitive adhesive layers obtained in Examples and Comparative Examples (200 m
m × 150 mm) was attached to a glass plate via the pressure-sensitive adhesive layer, and the presence or absence of foaming was visually observed after heating in an atmosphere of 90 ° C. for 2 hours.
【００４９】耐湿性 実施例、比較例で得た粘着剤層付の偏光フィルム（200m
m×150mm）について、それをその粘着剤層を介してガラ
ス板に貼着し、６０℃、９０％Ｒ．Ｈ．の雰囲気中で２
４時間加熱後における発泡と剥がれの有無を目視観察し
た。Moisture resistance Polarizing films with pressure-sensitive adhesive layers obtained in Examples and Comparative Examples (200 m
m × 150 mm), it was attached to a glass plate via the pressure-sensitive adhesive layer, and 60 ° C., 90% R. H. In the atmosphere of 2
The presence or absence of foaming and peeling after heating for 4 hours was visually observed.
【００５０】透過率維持性 実施例、比較例で得た粘着剤層付の偏光フィルム（200m
m×150mm）について、それをその粘着剤層を介してガラ
ス板の両面に表裏で吸収軸が直交するように貼着し、９
０℃の雰囲気中で２時間加熱したのち、顕微分光光度計
（ＴＦＭ−１２０ＣＦＴ−ＰＣ、オーク製作所製）を用
いて偏光フィルムの周端５mmライン上の４９点と中心部
での光透過率を測定し、中心部と周端部における最大透
過率差を調べた。Transmittance maintaining property Polarizing films with pressure-sensitive adhesive layers (200 m) obtained in Examples and Comparative Examples
m × 150 mm), it was pasted on both sides of the glass plate through the adhesive layer so that the absorption axes were perpendicular to each other, and 9
After heating in an atmosphere of 0 ° C for 2 hours, use a microspectrophotometer (TFM-120CFT-PC, manufactured by Oak Manufacturing Co., Ltd.) to measure the light transmittance at 49 points on the peripheral edge 5 mm line of the polarizing film and at the center. The maximum transmittance difference between the central portion and the peripheral edge portion was measured.
【００５１】位相差維持性 実施例、比較例で光学フィルムとして得た粘着剤層付の
楕円偏光フィルム（200mm×150mm）について、それをそ
の粘着剤層を介してガラス板に貼着し、その初期時と、
９０℃の雰囲気中で２時間加熱後における位相差（△ｎ
・ｄ）を、前記顕微分光光度計を用いた偏光干渉法によ
り楕円偏光フィルムの長辺方向の２５点について測定
し、加熱前後における位相差の最大変化（差）を調べ
た。Retention property of retardation About the elliptical polarizing film with adhesive layer (200 mm × 150 mm) obtained as an optical film in Examples and Comparative Examples, it was attached to a glass plate via the adhesive layer, and At the beginning,
Phase difference after heating for 2 hours in an atmosphere of 90 ° C. (Δn
* D) was measured at 25 points in the long side direction of the elliptical polarizing film by the polarization interference method using the microspectrophotometer, and the maximum change (difference) in the phase difference before and after heating was examined.
【００５２】前記の結果を次表に示した。 The above results are shown in the following table.
【００５３】[0053]
【発明の効果】本発明によれば、リワーク性や切断加工
性、保存性等に優れると共に、加熱加湿処理で発泡や剥
がれを生じず、かつ高温雰囲気に置いても光透過率や位
相差等の光学特性が低下しにくい耐湿熱性と光学機能維
持性の両方にも優れる液晶表示装置用の光学フィルムを
得ることができる。According to the present invention, it is excellent in reworkability, cutting workability, storability, etc., does not cause foaming or peeling due to heating and humidification, and has light transmittance, phase difference, etc. even when placed in a high temperature atmosphere. It is possible to obtain an optical film for a liquid crystal display device, which is excellent in both wet heat resistance and optical function maintenance in which the optical properties of (3) are not likely to deteriorate.
【図１】光学フィルム例の断面図。FIG. 1 is a sectional view of an example of an optical film.
【図２】他の光学フィルム例の断面図。FIG. 2 is a cross-sectional view of another example of an optical film.
【図３】液晶表示装置例の断面図。FIG. 3 is a cross-sectional view of an example of a liquid crystal display device.
【図４】他の液晶表示装置例の断面図。FIG. 4 is a cross-sectional view of another liquid crystal display device example.
２：光学フィルム素材 ２１：偏光フィルム ２２：位相差フィルム ２３：反射層 ３：粘着剤層 ５：液晶セル 2: Optical film material 21: Polarizing film 22: Retardation film 23: Reflective layer 3: Adhesive layer 5: Liquid crystal cell
Claims (5)
酸アルキルエステルを７０〜９９重量％含有するアクリ
ル系共重合体を用いたアクリル系粘着剤からなる、４０
０gf／cm2のズレ応力負荷時のズレ速度に基づく凝集力
が０．２μm／分以上の粘着剤層を、液晶セルに貼着す
るための光学フィルム素材の片面又は両面に設けたこと
を特徴とする液晶表示装置用の光学フィルム。1. An acrylic pressure-sensitive adhesive comprising an acrylic copolymer containing 70 to 99% by weight of an alkyl acrylate having an alkyl group having 1 to 9 carbon atoms.
A pressure-sensitive adhesive layer having a cohesive force of 0.2 μm / min or more based on a shift speed when a shift stress of 0 gf / cm 2 is applied is provided on one side or both sides of an optical film material for sticking to a liquid crystal cell. An optical film for a liquid crystal display device.
型偏光フィルム又は位相差フィルムである請求項１に記
載の光学フィルム。2. The optical film according to claim 1, wherein the optical film material is a polarizing film, a reflective polarizing film or a retardation film.
粘着剤層を介して、偏光フィルムと位相差フィルムを積
層した楕円偏光フィルム、又は反射型偏光フィルムと位
相差フィルムを積層した反射型楕円偏光フィルムである
請求項１に記載の光学フィルム。3. An elliptical polarizing film in which an optical film material is laminated with a polarizing film and a retardation film via the pressure-sensitive adhesive layer according to claim 1, or a reflective ellipse in which a reflective polarizing film and a retardation film are laminated. The optical film according to claim 1, which is a polarizing film.
酸アルキルエステルの含有量が７０〜９９重量％で、カ
ルボキシル基又は／及びヒドロキシル基を有する官能性
モノマーの含有量が１〜３０重量％であり、重量平均分
子量が３０万〜１４０万のアクリル系共重合体と架橋剤
からなり、請求項１に記載した粘着剤層を形成するため
のアクリル系粘着剤。4. The content of the alkyl acrylate having an alkyl group having 1 to 9 carbon atoms is 70 to 99% by weight, and the content of the functional monomer having a carboxyl group and / or a hydroxyl group is 1 to 30% by weight. %, The acrylic pressure-sensitive adhesive for forming the pressure-sensitive adhesive layer according to claim 1, comprising an acrylic copolymer having a weight average molecular weight of 300,000 to 1.4 million and a crosslinking agent.
に記載の光学フィルムの少なくとも１枚が貼着されてい
ることを特徴とする液晶表示装置。5. The liquid crystal cell according to any one of claims 1 to 3 on one side or both sides.
A liquid crystal display device, wherein at least one of the optical films according to item 1 is attached.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6115873A JPH07301792A (en) | 1994-05-02 | 1994-05-02 | Optical film and liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6115873A JPH07301792A (en) | 1994-05-02 | 1994-05-02 | Optical film and liquid crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07301792A true JPH07301792A (en) | 1995-11-14 |
Family
ID=14673279
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6115873A Pending JPH07301792A (en) | 1994-05-02 | 1994-05-02 | Optical film and liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07301792A (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19990045396A (en) * | 1997-11-17 | 1999-06-25 | 고오사이 아끼오 | Optical film laminate chip manufacturing method and optical film laminate intermediate |
| JP2000171634A (en) * | 1998-12-01 | 2000-06-23 | Nitto Denko Corp | Adhesive optical member |
| JP2000356715A (en) * | 1999-04-13 | 2000-12-26 | Lg Philips Lcd Co Ltd | Polalizer integrated with transparent conductive film, touch panel integrated with the polarizer and flat panel display integrated with the touch panel |
| JP2001296426A (en) * | 2000-04-17 | 2001-10-26 | Nitto Denko Corp | Method for manufacturing polarizing plate and liquid crystal display device |
| JP2002105415A (en) * | 2000-09-29 | 2002-04-10 | Nippon Shokubai Co Ltd | Adhesive product and pressure-sensitive adhesive |
| KR100444412B1 (en) * | 1996-01-09 | 2004-11-08 | 닛토덴코 가부시키가이샤 | Optical film and liquid crystal display device |
| JP2008282024A (en) * | 2008-06-03 | 2008-11-20 | Nitto Denko Corp | Adhesive optical member |
| JP2010170139A (en) * | 2010-02-16 | 2010-08-05 | Nitto Denko Corp | Adhesive optical member |
| JP2010237678A (en) * | 2010-04-30 | 2010-10-21 | Nitto Denko Corp | Adhesive for optical film, adhesive layer for optical film, and method for manufacturing the same |
| JP2012141620A (en) * | 2012-02-13 | 2012-07-26 | Nitto Denko Corp | Adhesive for optical film, adhesive layer for optical film and production method of the same |
| JP2013067782A (en) * | 2011-09-09 | 2013-04-18 | Toyo Ink Sc Holdings Co Ltd | Optical adhesive, optical adhesive sheet, and laminate |
| WO2015141379A1 (en) * | 2014-03-18 | 2015-09-24 | 綜研化学株式会社 | Adhesive composition for polarizing plate, adhesive sheet and polarizing plate with adhesive layer |
-
1994
- 1994-05-02 JP JP6115873A patent/JPH07301792A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100444412B1 (en) * | 1996-01-09 | 2004-11-08 | 닛토덴코 가부시키가이샤 | Optical film and liquid crystal display device |
| KR19990045396A (en) * | 1997-11-17 | 1999-06-25 | 고오사이 아끼오 | Optical film laminate chip manufacturing method and optical film laminate intermediate |
| JP2000171634A (en) * | 1998-12-01 | 2000-06-23 | Nitto Denko Corp | Adhesive optical member |
| JP2000356715A (en) * | 1999-04-13 | 2000-12-26 | Lg Philips Lcd Co Ltd | Polalizer integrated with transparent conductive film, touch panel integrated with the polarizer and flat panel display integrated with the touch panel |
| JP2001296426A (en) * | 2000-04-17 | 2001-10-26 | Nitto Denko Corp | Method for manufacturing polarizing plate and liquid crystal display device |
| JP2002105415A (en) * | 2000-09-29 | 2002-04-10 | Nippon Shokubai Co Ltd | Adhesive product and pressure-sensitive adhesive |
| JP2008282024A (en) * | 2008-06-03 | 2008-11-20 | Nitto Denko Corp | Adhesive optical member |
| JP2010170139A (en) * | 2010-02-16 | 2010-08-05 | Nitto Denko Corp | Adhesive optical member |
| JP2010237678A (en) * | 2010-04-30 | 2010-10-21 | Nitto Denko Corp | Adhesive for optical film, adhesive layer for optical film, and method for manufacturing the same |
| JP2013067782A (en) * | 2011-09-09 | 2013-04-18 | Toyo Ink Sc Holdings Co Ltd | Optical adhesive, optical adhesive sheet, and laminate |
| JP2012141620A (en) * | 2012-02-13 | 2012-07-26 | Nitto Denko Corp | Adhesive for optical film, adhesive layer for optical film and production method of the same |
| WO2015141379A1 (en) * | 2014-03-18 | 2015-09-24 | 綜研化学株式会社 | Adhesive composition for polarizing plate, adhesive sheet and polarizing plate with adhesive layer |
| JPWO2015141379A1 (en) * | 2014-03-18 | 2017-04-06 | 綜研化学株式会社 | Adhesive composition for polarizing plate, adhesive sheet and polarizing plate with adhesive layer |
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