JP3728035B2 - Adhesive film - Google Patents
Adhesive film Download PDFInfo
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- JP3728035B2 JP3728035B2 JP32803596A JP32803596A JP3728035B2 JP 3728035 B2 JP3728035 B2 JP 3728035B2 JP 32803596 A JP32803596 A JP 32803596A JP 32803596 A JP32803596 A JP 32803596A JP 3728035 B2 JP3728035 B2 JP 3728035B2
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- film
- sensitive adhesive
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- Adhesive Tapes (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Optical Elements Other Than Lenses (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明は、液晶表示装置の表示デバイスに使用される粘着フィルムに関するものである。
【０００２】
【従来の技術】
液晶表示素子は、２枚の電極基盤の間に液晶を封入し、電極基盤の電極に電圧を印加することによって光学的性質が変化する液晶の性質を利用し、所望の表示パターンを得る素子である。このような液晶表示素子は、素子の厚みが薄く表示パターンを自由に選択することができ、かつ、消費電力が非常に低く、低電圧駆動が可能であり、ＣＭＯＳ−ＩＣの直接駆動ができることから、電卓、エアコン、電話機などのほとんどの表示部分の表示装置として使用されている。例えば、ツイストネマチック型液晶表示素子は、前記２枚の上下電極基盤の外側に偏光板を備えている素子であり、この素子の各ドットにスイッチング素子（ＴＦＴ）を付けて駆動させられ、カラーフィルターと組み合わせた表示体が液晶テレビや液晶ムービーに使用されている。
【０００３】
この液晶表示装置は、表示する際の光源のとり方から次の３つのタイプに区分される。即ち、（１）常にバックライトを用いて、液晶表示装置の使用される環境つまり表示装置の置かれている周囲の明るさに関係なく表示が読み取れる透過型、（２）バックライトを用いず、光源として外光を利用する反射型（周囲が暗いと表示を読みとるのが非常に困難であり使用条件が限られる）、（３）液晶表示装置の置かれている環境すなわち周囲の明るさに合わせて反射型と透過型を使い分ける半透過型、の３つである。半透過型は、周囲が明るい場合はバックライトを用いず外光を光源として反射型に用い、周囲が暗い場合にのみバックライトを光源とする透過型とに使い分ける。もしくはバックライトの明るさを落とし常時点灯として外光とバックライトの明るい方を主として光源に使うタイプである。
以上３タイプの中でも、半透過型の液晶表示装置は周囲環境に関係なく使用でき、かつ明るい場所ではバックライトを使用しないか、光量を絞っている省電力でもあることから半透過型の使用比率は大きなウェイトを占めるようになってきている。半透過型液晶表示装置の構成は、通常、表示面から１）偏光板、２）液晶セル、３）半透過偏光板、４）バックライトとなっている。
【０００４】
【発明が解決しようとする課題】
前述の半透過偏光板は通常の偏光板に半透過フィルムを粘着剤もしくは接着剤により貼り合わせたもので、半透過層の側を液晶セルの面と反対側になるように設置される。しかしながら偏光板はその使用用途により明るさ、色調、偏光度、耐久性等の要求されるレベルが各種各様であり、また半透過フィルムについても同様に全光線反射率、全光線透過率、拡散光線反射率、拡散光線透過率、色調、風合い、耐久性等種々の要求特性がある。これらの要求を同時に満足させる組み合わせを偏光板メーカーが偏光板製造時に偏光板と半透過フィルムを貼り合わせて製造しているのが通常である。しかしながら、このような多種多様の要求に応えるため偏光板の選定、半透過フィルムの選定は試行錯誤を繰り返しながら決定されているのが現状であり、更に、市販されている半透過フィルムはその反射、透過特性が限られているので要求通りの半透過偏光板を製造するのは容易ではない。
【０００５】
【課題を解決するための手段】
本発明者らは前述の課題を解決するため、半透過偏光板を次の３つのパーツに分けて考えた。すなわち、（１）半透過の機能部分（半透過層）と（２）バックライト側のフィルム（一般には白濁した半透明のフィルムであり半透過層と一体化されている。）、（３）偏光板の３つである。これらのそれぞれを単独に取り扱うことで多種多様のニーズに応えられるよう鋭意検討を行った結果、本発明に至った。すなわち、本発明は、
（１）アクリル樹脂系粘着剤に反射材及び架橋剤を配合し、得られた粘着剤組成物をフィルム上に塗布したあと剥離フィルムにて粘着剤層を挟持してなる構成の粘着フィルム、
（２）アクリル樹脂系粘着剤に反射材及び架橋剤を配合し、得られた粘着剤組成物を塗布するフィルムが剥離フィルムである（１）の粘着フィルム、
（３）反射材量の割合が粘着剤固形分量と反射材量の合計に対し５〜４０％である（１）の粘着フィルム、
（４）全光線反射率が３０〜７０％及び全光線透過率が１０〜７０％の半透過機能を有する（１）又は（２）の粘着フィルム、
に関する。
【０００６】
【発明の実施の形態】
本発明で使用する、アクリル樹脂系粘着剤に反射材及び架橋剤を配合したものは、光が反射する性質と透過する性質の双方の性質を有している（この性質を半透過性という）。ここで使用されるアクリル樹脂系粘着剤としては光学用途に使用しうるものであれば特に制限はなく、その用途により選択できる。一般に光学用途の粘着剤は、その平均分子量や、分子量分布、重合物を構成しているモノマーの特性から耐久性の上で大きく次のように分類されている。即ち、通常の環境条件であれば問題ない程度の民生タイプ、１００℃以上の比較的高温、及び７０℃、関係湿度８０％以上の高湿度条件でも問題を生じない高耐久タイプ、民生タイプと高耐久タイプの中間に位置する中耐久タイプである。使用する粘着剤のタイプは、用途に応じた耐久性を満足すればどのタイプの粘着剤を使用しても差し支えない。
【０００７】
本発明に用いられる架橋剤としてはアクリル樹脂系粘着剤に対して常用のものであれば特に制限はなく、例えば脂肪族ジイソシアネート、芳香族ジイソシアネート等のポリイソシアネート化合物、ブチルエーテル化スチロールメラミン等のメラミン化合物、エポキシ樹脂系化合物、金属塩等がその目的、用途により選択され、用いられる。架橋剤の使用量はアクリル樹脂系粘着剤１００重量部あたり０．００１〜１０重量部、好ましくは０．００５〜５重量部、さらに好ましくは０．０１〜５重量部程度がよい。
【０００８】
本発明に使用される反射材としては、アクリル樹脂系粘着剤中に分散した状態で光沢を保持するものであれば特に制限はない。例えば、真珠顔料として用いられる酸化チタン（アナターゼ）被覆雲母粒子、酸化チタン（ルチル）被覆雲母粒子がある。また、各種金属および酸化物、硫化物等の金属化合物の粉末があげられる。例えば、酸化チタン、酸化亜鉛、硫化亜鉛、アルミニウム、銀、シリカ、アルミナ等があげられる。反射材は、通常粉末の状態でアクリル樹脂系粘着剤と混合されるが粉末の粒径については特に制限はない。反射、透過の要求特性に合わせて調製されるものであり、一般に粒径が小さいと反射特性が上がりきめ細かい風合いとなり、粒径が大きいと透過特性が上がってきめの粗い風合いとなる。一般的には５〜１３０μｍの粒径が好ましく、この範囲の中で反射、透過の要求特性に適合すべく選定される。
【０００９】
本発明に使用される反射材の割合は、アクリル樹脂系粘着剤の不揮発分と反射材の合計量に対し５〜４０重量％がよい。反射材の割合が小さいと透過特性が上がり、大きいと反射特性が上がるが、要求される光学特性に合わせて割合を調製する。その割合が４０重量％を超えた場合、アクリル系樹脂粘着剤のフィルムに対する粘着力が著しく低下する。また、５重量％未満であれば反射の効果が著しく低下し、反射材の不均一分散による斑も生じ易い。
【００１０】
本発明に使用される、アクリル樹脂系粘着剤および反射材、架橋剤の混合物を塗布するフィルムは光学用途に供されるものであれば特に限定されない。半透過フィルムとして要求される光学特性を満たすものであればどのようなフィルムを使用しても差し支えない。例えば、材質としてはポリエチレンテレフタレート（ＰＥＴ）フィルム、ポリカーボネイトフィルム、トリアセチルセルロースフィルム、ＡＢＳ樹脂フィルム、アクリル樹脂フィルム等があげられる。また、フィルムの形態としては、例えば白濁した半透明のマットフィルム、透明フィルム、フィルム片面に離型処理を施した透明剥離フィルム、透明着色フィルム等があげられる。特に、透明剥離フィルム上に塗布することにより半透過層を透明剥離フィルムで挟持したフィルムは、半透過層に粘着性があるため、片面を目的にあった偏光板、片面を上述のマットフィルム、透明フィルム、着色フィルム等任意に貼り合わせることが可能となり、要求にあった特性の半透過偏光板を容易に製造可能ならしめる。フィルムの厚さは２０〜１００μｍ程度が好ましい。
【００１１】
剥離フィルムとしては特に限定はなく、通常の剥離フイルムが使用出来るが、好ましいものは透明なポリエステル樹脂製フイルムである。又、剥離性向上のためにシリコンコーティングされた透明フイルムが好ましい。シリコンは縮合型、付加型いずれでも使用できる。
【００１２】
本発明の粘着フィルムの光学特性は全光線反射率が３０〜７０％、かつ全光線透過率が１０〜７０％であることが好ましい。ここで、全光線反射率が３０％未満であれば、反射の光源が外光であることから光量的に不充分となり実用的でない。また、全光線反射率が７０％を超えると、全光線透過率を１０％以上に維持するのは困難となる。また、全光線透過率が１０％未満であれば、表示を読みとるのに必要なバックライトの光量を増大する必要が生じ、実用的ではない。さらに、全光線透過率が７０％を超えると、全光線反射率を３０％以上に維持することが困難となる。
【００１３】
本発明の粘着フィルムは、例えば上記の各成分を溶剤中で混合し、得られた粘着剤液を上記のフィルムに、乾燥後の厚さが５〜１００μｍ、好ましくは５〜４０μｍ程度となるように、塗布後溶剤を乾燥し、次いで剥離フィルムを粘着剤面に貼り合わせることにより得ることができる。ここで溶剤としては、メチルエチルケトン、トルエン等の低沸点の有機溶剤が使用出来る。
【００１４】
【実施例】
以下、実施例を挙げて本発明を詳細に説明するが、本発明は以下の実施例に限定されるものではない。なお、全光線反射率、全光線透過率は積分球付き分光光度計を用いて測定した結果である。
【００１５】
実施例１
粘着剤としてサイデン化学（株）製ＡＴ−３００１を１０００部と、架橋剤としてサイデン化学（株）製ＡＴ−３００２を１５部、反射材として二酸化チタン被覆マイカ（日本光研（株）製ＳＭＥ−９０）を２５０部、更に加工性をあげるため溶剤としてメチルエチルケトンを５００部添加してフィルム上に乾燥後の厚さが３０μｍとなるように塗布した。フィルムは東洋紡（株）製透明ＰＥＴフィルムＡ−４１００を用いた。塗布した後、溶剤を乾燥して剥離フィルムを粘着剤面に貼り合わせ、半透過粘着フィルムを得た。この半透過粘着フィルムの全光線反射率は６９．８％、全光線透過率は１３．５％であった。このようにして得られた粘着フィルムを通常の保管場所（光学フィルムを保管する場所、温度２０±１０℃、関係湿度６０±５％）で１ヶ月間保管し、剥離フィルムを剥して偏光フィルムと貼り合わせたところ、製造時に粘着剤を貼り合わせたときと比べて粘着力に差異はなかった。また、耐久性においても、製造時に粘着剤を貼り合わせたときと比べて差異はなかった。
【００１６】
実施例２
粘着剤として綜研化学（株）製ＳＫダインＡＳ−１９２５を１０００部、架橋剤として綜研化学（株）製Ｄ−５９０を１部、反射材として二酸化チタン被覆マイカ（メルクジャパン（株）製イリオジン−１２０）を４０部、更に加工性をあげるため溶剤としてトルエンを４００部添加して剥離フィルム上に乾燥後の厚さが３０μｍとなるように塗布した。剥離フィルムはリンテック（株）製のＰＥＴ３８Ａを用いた。塗布した後、溶剤を乾燥して剥離フィルムを粘着剤面に貼り合わせ、粘着剤の両面が剥離フィルムである半透過粘着フィルムを得た。この半透過粘着フィルムの全光線反射率は５３．０％、全光線透過率は４３．１％であった。このようにして得られた粘着フィルムを実施例１と同様の保管場所に１ヶ月間保管し、一方の剥離フィルムを剥して偏光板に、次いで他方の剥離フィルムを剥してダイアホイル（株）製白濁ＰＥＴフィルムＥ−１３０と貼り合わせたところ、製造時に粘着剤を貼り合わせたときと比べて粘着力に差異はなかった。また、耐久性においても、製造時に粘着剤を貼り合わせたときと比べて差異はなかった。
【００１７】
【発明の効果】
本発明の粘着フィルムを使用することにより、半透過層を半透過偏光板のパーツとして取り扱えるようになった。したがって、半透過偏光板を構成する基材フィルム、半透過層、偏光板の各種組み合わせが可能となり、要求特性を迅速に満たすことが可能となった。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an adhesive film used for a display device of a liquid crystal display device.
[0002]
[Prior art]
A liquid crystal display element is an element that obtains a desired display pattern by enclosing a liquid crystal between two electrode substrates and utilizing the properties of liquid crystal whose optical properties change by applying a voltage to the electrodes of the electrode substrate. is there. Such a liquid crystal display element has a thin element thickness, can freely select a display pattern, consumes very low power, can be driven at a low voltage, and can directly drive a CMOS-IC. It is used as a display device for most display parts such as calculators, air conditioners and telephones. For example, a twisted nematic liquid crystal display element is an element having a polarizing plate outside the two upper and lower electrode bases, and is driven by attaching a switching element (TFT) to each dot of the element. Is used in LCD TVs and LCD movies.
[0003]
This liquid crystal display device is classified into the following three types according to the method of taking a light source for display. That is, (1) always using a backlight, a transmissive type in which the display can be read regardless of the environment in which the liquid crystal display device is used, that is, the surrounding brightness of the display device, and (2) without using the backlight, Reflective type that uses external light as a light source (when the surroundings are dark, it is very difficult to read the display and the usage conditions are limited), (3) Match the environment where the liquid crystal display is located, that is, the ambient brightness There are three types, a transflective type that selectively uses a reflective type and a transmissive type. The semi-transmission type is used as a reflection type using external light as a light source without using a backlight when the surroundings are bright, and is selectively used as a transmission type using a backlight as a light source only when the surroundings are dark. Alternatively, the brightness of the backlight is reduced and the light is always turned on, and the brighter of the outside light and the backlight is mainly used as the light source.
Among the above three types, transflective liquid crystal display devices can be used regardless of the surrounding environment, and do not use a backlight in a bright place, or because they save power by reducing the amount of light, the transflective type usage ratio Has become a big weight. The configuration of the transflective liquid crystal display device is usually 1) polarizing plate, 2) liquid crystal cell, 3) transflective polarizing plate, and 4) backlight from the display surface.
[0004]
[Problems to be solved by the invention]
The above-described transflective polarizing plate is obtained by attaching a transflective film to an ordinary polarizing plate with an adhesive or an adhesive, and is set so that the transflective layer side is opposite to the surface of the liquid crystal cell. However, polarizing plates have various required levels of brightness, color tone, degree of polarization, durability, etc. depending on their usage, and the same applies to the total light reflectance, total light transmittance, diffusion for semi-transparent films. There are various required characteristics such as light reflectance, diffused light transmittance, color tone, texture, and durability. It is usual that a polarizing plate manufacturer manufactures a combination that satisfies these requirements at the same time by laminating a polarizing plate and a semi-transmissive film at the time of manufacturing the polarizing plate. However, in order to meet such a wide variety of requirements, the selection of polarizing plates and the selection of transflective films are currently determined through repeated trial and error, and the commercially available transflective film has its reflection. Since the transmission characteristics are limited, it is not easy to manufacture a transflective polarizing plate as required.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present inventors considered the transflective polarizing plate by dividing it into the following three parts. That is, (1) a translucent functional part (semi-transmissive layer) and (2) a backlight side film (generally a translucent film which is cloudy and integrated with the semi-transmissive layer), (3). There are three polarizing plates. As a result of intensive studies to handle each of these individually to meet a wide variety of needs, the present invention has been achieved. That is, the present invention
(1) A pressure-sensitive adhesive film having a configuration in which a reflective material and a crosslinking agent are blended in an acrylic resin-based pressure-sensitive adhesive, and the pressure-sensitive adhesive composition is sandwiched between release films after the obtained pressure-sensitive adhesive composition is applied on the film.
(2) The pressure-sensitive adhesive film according to (1), wherein the film for applying the pressure-sensitive adhesive composition is a release film by blending a reflective material and a crosslinking agent with the acrylic resin-based pressure-sensitive adhesive.
(3) The pressure-sensitive adhesive film according to (1), wherein the ratio of the amount of the reflective material is 5 to 40% based on the total amount of the pressure-sensitive adhesive solid content and the amount of the reflective material,
(4) The pressure-sensitive adhesive film according to (1) or (2) having a semi-transmissive function having a total light reflectance of 30 to 70% and a total light transmittance of 10 to 70%,
About.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The acrylic resin-based pressure-sensitive adhesive used in the present invention, in which a reflective material and a crosslinking agent are blended, has both the property of reflecting light and the property of transmitting light (this property is referred to as translucency). . The acrylic resin-based pressure-sensitive adhesive used here is not particularly limited as long as it can be used for optical applications, and can be selected depending on the application. In general, pressure-sensitive adhesives for optical use are roughly classified in terms of durability from the average molecular weight, molecular weight distribution, and characteristics of monomers constituting the polymer as follows. In other words, a consumer type that has no problem under normal environmental conditions, a relatively high temperature of 100 ° C. or higher, and a highly durable type that does not cause a problem even under high humidity conditions of 70 ° C. and a relative humidity of 80% or higher. It is a medium durability type located in the middle of the durability type. Any type of pressure-sensitive adhesive may be used as long as the type of pressure-sensitive adhesive satisfies the durability of the application.
[0007]
The crosslinking agent used in the present invention is not particularly limited as long as it is a conventional one for acrylic resin-based pressure-sensitive adhesives. For example, polyisocyanate compounds such as aliphatic diisocyanates and aromatic diisocyanates, and melamine compounds such as butyl etherified styrene melamine Epoxy resin compounds, metal salts and the like are selected and used depending on the purpose and application. The amount of the crosslinking agent used is 0.001 to 10 parts by weight, preferably 0.005 to 5 parts by weight, more preferably about 0.01 to 5 parts by weight per 100 parts by weight of the acrylic resin-based pressure-sensitive adhesive.
[0008]
The reflecting material used in the present invention is not particularly limited as long as it retains gloss in a state dispersed in an acrylic resin adhesive. For example, there are titanium oxide (anatase) -coated mica particles and titanium oxide (rutile) -coated mica particles used as pearl pigments. In addition, powders of various metals and metal compounds such as oxides and sulfides can be given. Examples thereof include titanium oxide, zinc oxide, zinc sulfide, aluminum, silver, silica, and alumina. The reflector is usually mixed with an acrylic resin-based pressure-sensitive adhesive in a powder state, but the particle size of the powder is not particularly limited. It is prepared in accordance with the required characteristics of reflection and transmission. Generally, when the particle size is small, the reflection property is increased and the texture is fine. When the particle size is large, the transmission characteristic is increased and the texture is rough. In general, a particle size of 5 to 130 μm is preferable, and is selected within this range so as to meet the required characteristics of reflection and transmission.
[0009]
The ratio of the reflective material used in the present invention is preferably 5 to 40% by weight based on the total amount of the non-volatile content of the acrylic resin-based adhesive and the reflective material. If the ratio of the reflective material is small, the transmission characteristics are improved, and if the ratio is large, the reflection characteristics are increased. However, the ratio is adjusted according to the required optical characteristics. When the ratio exceeds 40 weight%, the adhesive force with respect to the film of an acrylic resin adhesive will fall remarkably. Moreover, if it is less than 5 weight%, the effect of reflection will fall remarkably and the spot by nonuniform dispersion | distribution of a reflecting material will also arise easily.
[0010]
The film for applying the mixture of the acrylic resin-based pressure-sensitive adhesive, the reflective material, and the crosslinking agent used in the present invention is not particularly limited as long as it is used for optical applications. Any film may be used as long as it satisfies the optical characteristics required as a transflective film. Examples of the material include a polyethylene terephthalate (PET) film, a polycarbonate film, a triacetyl cellulose film, an ABS resin film, and an acrylic resin film. Examples of the form of the film include a cloudy translucent matte film, a transparent film, a transparent release film having a release treatment applied to one side of the film, and a transparent colored film. In particular, a film in which a semi-transparent layer is sandwiched between transparent release films by coating on a transparent release film is adhesive to the semi-transparent layer, so that a polarizing plate intended for one side, the above-mentioned mat film, A transparent film, a colored film, and the like can be arbitrarily bonded to each other, so that a transflective polarizing plate having required characteristics can be easily manufactured. The thickness of the film is preferably about 20 to 100 μm.
[0011]
There is no limitation in particular as a peeling film, Although a normal peeling film can be used, A preferable thing is a transparent polyester resin film. Further, a transparent film coated with silicon for improving the peelability is preferable. Silicon can be used in either a condensation type or an addition type.
[0012]
The optical properties of the adhesive film of the present invention are preferably such that the total light reflectance is 30 to 70% and the total light transmittance is 10 to 70%. Here, if the total light reflectance is less than 30%, the light source for reflection is outside light, so that the amount of light is insufficient, which is not practical. Further, if the total light reflectance exceeds 70%, it becomes difficult to maintain the total light transmittance at 10% or more. On the other hand, if the total light transmittance is less than 10%, it is necessary to increase the amount of backlight necessary for reading the display, which is not practical. Furthermore, when the total light transmittance exceeds 70%, it becomes difficult to maintain the total light reflectance at 30% or more.
[0013]
In the pressure-sensitive adhesive film of the present invention, for example, each of the above components is mixed in a solvent, and the resulting pressure-sensitive adhesive liquid is mixed with the above film so that the thickness after drying is about 5 to 100 μm, preferably about 5 to 40 μm. In addition, it can be obtained by drying the solvent after coating and then bonding the release film to the pressure-sensitive adhesive surface. Here, as the solvent, an organic solvent having a low boiling point such as methyl ethyl ketone or toluene can be used.
[0014]
【Example】
EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated in detail, this invention is not limited to a following example. The total light reflectance and total light transmittance are the results of measurement using a spectrophotometer with an integrating sphere.
[0015]
Example 1
1000 parts of Seiden Chemical Co., Ltd. AT-3001 as adhesive, 15 parts of Seiden Chemical Co., Ltd. AT-3002 as a cross-linking agent, titanium dioxide coated mica (SME- manufactured by Nippon Koken Co., Ltd.) as a reflective material 90) was added in an amount of 250 parts, and 500 parts of methyl ethyl ketone was added as a solvent to further improve the workability, and the resulting film was applied on the film so that the thickness after drying was 30 μm. As the film, Toyobo Co., Ltd. transparent PET film A-4100 was used. After coating, the solvent was dried and the release film was bonded to the pressure-sensitive adhesive surface to obtain a translucent pressure-sensitive adhesive film. The transflective adhesive film had a total light reflectance of 69.8% and a total light transmittance of 13.5%. The pressure-sensitive adhesive film thus obtained is stored for 1 month in a normal storage location (optical film storage location, temperature 20 ± 10 ° C., relative humidity 60 ± 5%), and the release film is peeled off to form a polarizing film. As a result of bonding, there was no difference in adhesive strength as compared with the case where the pressure-sensitive adhesive was bonded during production. Also, in terms of durability, there was no difference compared to the case where the adhesive was bonded at the time of manufacture.
[0016]
Example 2
1000 parts of SK Dyne AS-1925 manufactured by Soken Chemical Co., Ltd. as an adhesive, 1 part of D-590 manufactured by Soken Chemical Co., Ltd. as a cross-linking agent, and titanium dioxide-coated mica (Iriodin manufactured by Merck Japan Co., Ltd.) as a reflective material 120) was added in an amount of 40 parts, and 400 parts of toluene was added as a solvent to further improve the workability, and the resulting film was coated on the release film so that the thickness after drying was 30 μm. As the release film, PET38A manufactured by Lintec Corporation was used. After coating, the solvent was dried and the release film was bonded to the pressure-sensitive adhesive surface to obtain a translucent pressure-sensitive adhesive film in which both sides of the pressure-sensitive adhesive were release films. The translucent adhesive film had a total light reflectance of 53.0% and a total light transmittance of 43.1%. The pressure-sensitive adhesive film thus obtained was stored in the same storage location as in Example 1 for one month. One peeled film was peeled off and then the other peeled film was peeled off and then the other peeled film was manufactured by Diafoil Co., Ltd. When bonded to the cloudy PET film E-130, there was no difference in adhesive strength compared to when the pressure-sensitive adhesive was bonded during production. Also, in terms of durability, there was no difference compared to the case where the adhesive was bonded at the time of manufacture.
[0017]
【The invention's effect】
By using the pressure-sensitive adhesive film of the present invention, the semi-transmissive layer can be handled as parts of the semi-transmissive polarizing plate. Therefore, various combinations of the base film, the semi-transmissive layer, and the polarizing plate constituting the semi-transmissive polarizing plate are possible, and the required characteristics can be quickly satisfied.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32803596A JP3728035B2 (en) | 1996-11-25 | 1996-11-25 | Adhesive film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32803596A JP3728035B2 (en) | 1996-11-25 | 1996-11-25 | Adhesive film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10152658A JPH10152658A (en) | 1998-06-09 |
| JP3728035B2 true JP3728035B2 (en) | 2005-12-21 |
Family
ID=18205794
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32803596A Expired - Lifetime JP3728035B2 (en) | 1996-11-25 | 1996-11-25 | Adhesive film |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3728035B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4320763B2 (en) * | 1999-02-22 | 2009-08-26 | 東洋紡績株式会社 | Easy adhesive film for optics |
| KR100385720B1 (en) * | 1999-04-30 | 2003-05-27 | 주식회사 엘지화학 | Acrylic pressure-sensitive adhesive composition for optical use having improved rework property and laminates coated therewith |
| DE10243215A1 (en) | 2002-09-17 | 2004-03-25 | Tesa Ag | Adhesive strip used in the manufacture of liquid crystal displays has two surfaces and a support with two supporting surfaces with an adhesive layer arranged on both surfaces |
| KR100515573B1 (en) | 2003-03-20 | 2005-09-20 | 주식회사 엘지화학 | Electro-magnetic shielding filter for plasma display panel and method for preparating the same |
| JP2006030950A (en) * | 2004-02-25 | 2006-02-02 | Fuji Photo Film Co Ltd | Cellulose acylate film, polarizing plate and liquid crystal display |
| JP7087162B2 (en) * | 2020-08-31 | 2022-06-20 | 日東電工株式会社 | Adhesive sheet |
| JP6884258B1 (en) * | 2020-08-31 | 2021-06-09 | 日東電工株式会社 | Adhesive sheet |
-
1996
- 1996-11-25 JP JP32803596A patent/JP3728035B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10152658A (en) | 1998-06-09 |
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