JP2002014225A - Polarizing film and liquid crystal panel using the same - Google Patents
Polarizing film and liquid crystal panel using the sameInfo
- Publication number
- JP2002014225A JP2002014225A JP2000134368A JP2000134368A JP2002014225A JP 2002014225 A JP2002014225 A JP 2002014225A JP 2000134368 A JP2000134368 A JP 2000134368A JP 2000134368 A JP2000134368 A JP 2000134368A JP 2002014225 A JP2002014225 A JP 2002014225A
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- JP
- Japan
- Prior art keywords
- refractive index
- adhesive
- polarizing film
- layer
- protective layer
- 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.)
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- Polarising Elements (AREA)
- Liquid Crystal (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、偏光フィルム及び
その偏光フィルムを用いた液晶パネルに関し、特に、大
きな入射角度でも使用できる偏光フィルムとその偏光フ
ィルムを用いた液晶パネルに関するものである。The present invention relates to a polarizing film and a liquid crystal panel using the polarizing film, and more particularly to a polarizing film that can be used even at a large incident angle and a liquid crystal panel using the polarizing film.
【０００２】[0002]
【従来の技術】透過型偏光フィルムや反射型偏光フィル
ムは、２色性物質を担持するポリビニルアルコール等の
高分子フィルムからなる偏光子とその両側に積層された
保護層とからなるが、従来、透過型及び反射型偏光フィ
ルムや、そのような偏光フィルムを用いた液晶パネルに
用いられる粘着剤としては、接着力、貼着作業性、透過
率、耐久性等の観点から、アクリル系粘着剤が一般に用
いられている。一方、偏光子の保護層としては、アクリ
ル樹脂フィルム、アセテートフィルム、及び、一軸延伸
ＰＥＴフィルム等が用いられる（永田良著「偏光フィル
ムの応用」ｐｐ．６６〜７５（１９８６．２．１０，Ｃ
ＭＣ発行））。次の表−１に主な保護層と粘着剤の屈折
率を示す。2. Description of the Related Art A transmission type polarizing film and a reflection type polarizing film comprise a polarizer made of a polymer film such as polyvinyl alcohol carrying a dichroic substance and protective layers laminated on both sides of the polarizer. As a transmission type and reflection type polarizing film and an adhesive used for a liquid crystal panel using such a polarizing film, an acrylic adhesive is used from the viewpoint of adhesive strength, sticking workability, transmittance, durability and the like. It is commonly used. On the other hand, as a protective layer of the polarizer, an acrylic resin film, an acetate film, a uniaxially stretched PET film, or the like is used (Ryo Nagata, “Application of Polarizing Film”, pp. 66-75 (1986.10, C.I.
MC issuance)). Table 1 below shows the refractive index of the main protective layer and the pressure-sensitive adhesive.
【０００３】 [0003]
【０００４】表−１に示したように、これら保護層の屈
折率と粘着剤のそれは同じではないことが一般的であ
る。そのため、保護層と粘着剤の間で界面反射が生じ、
光の反射損失の原因の一つとなっている。特に、入射光
の入射角度が５０°以上であるような揚合、反射光が急
激に増大することが知られており、反射損失が非常に大
きくなる欠点があった。As shown in Table 1, it is common that the refractive index of these protective layers is not the same as that of the pressure-sensitive adhesive. Therefore, interface reflection occurs between the protective layer and the adhesive,
This is one of the causes of light reflection loss. In particular, it is known that when the incident angle of the incident light is 50 ° or more, the reflected light is sharply increased, and there is a disadvantage that the reflection loss becomes extremely large.
【０００５】[0005]
【発明が解決しようとする課題】本発明は従来技術のこ
のような問題点に鑑みてなされたものであり、その目的
は、境界面に対して５０°以上の大きな入射角で入射す
る光に対しても使用できる偏光フィルムとそれを用いた
液晶パネルを提供することである。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to reduce the light incident on a boundary surface at a large incident angle of 50 ° or more. An object of the present invention is to provide a polarizing film that can be used for the same and a liquid crystal panel using the same.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成する本発
明の偏光フィルムは、偏光子上の少なくとも一方の保護
層上に粘着層を有する偏光フィルムにおいて、前記粘着
層として、前記保護層と屈折率を整合させた屈折率調整
粘着剤を用いたことを特徴とするものである。The polarizing film of the present invention, which achieves the above object, is a polarizing film having an adhesive layer on at least one protective layer on a polarizer. It is characterized in that a refractive index adjusting adhesive whose index is matched is used.
【０００７】この場合、その屈折率調整粘着剤が、粘着
剤４０〜９０重量％及びタッキファイヤー樹脂１０〜６
０重量％を含むことにより屈折率が整合されてなる粘着
剤組成物からなることが望ましい。In this case, the refractive index adjusting adhesive comprises 40 to 90% by weight of an adhesive and a tackifier resin of 10 to 6%.
It is desirable that the pressure-sensitive adhesive composition be made to have a refractive index matched by containing 0% by weight.
【０００８】また、屈折率調整粘着剤を介して離型フィ
ルムが粘着され、透過型偏光フィルムとして構成して
も、屈折率調整粘着剤を介して一方の保護層上に離型フ
ィルムが粘着され、屈折率調整粘着剤を介して他方の保
護層上に反射層が粘着され、反射型偏光フィルムとして
構成してもよい。[0008] Further, even when the release film is adhered through the refractive index adjusting adhesive and is constituted as a transmission type polarizing film, the releasing film is adhered on one protective layer via the refractive index adjusting adhesive. Alternatively, a reflective layer may be adhered on the other protective layer via a refractive index adjusting adhesive to form a reflective polarizing film.
【０００９】なお、以上の偏光フィルムを粘着層を介し
て液晶セルを構成する透明基板に粘着して液晶パネルを
構成することもできる。The above-mentioned polarizing film may be adhered to a transparent substrate constituting a liquid crystal cell via an adhesive layer to form a liquid crystal panel.
【００１０】本発明において、偏光子上の少なくとも一
方の保護層上に粘着層を有する偏光フィルムのその粘着
層として保護層と屈折率を整合させた屈折率調整粘着剤
を用いているので、保護層と粘着層の境界での界面反射
光を低減することができ、光の利用効率を高めることが
できる。したがって、明るい透過型及び反射型偏光フィ
ルムを構成することができ、そのような偏光フィルムを
液晶パネルに用いることにより明るい表示等が可能にな
る。In the present invention, the polarizing film having an adhesive layer on at least one protective layer on the polarizer uses a refractive index adjusting adhesive whose refractive index is matched with that of the protective layer as the adhesive layer. The interface reflected light at the boundary between the layer and the adhesive layer can be reduced, and the light use efficiency can be increased. Therefore, bright transmissive and reflective polarizing films can be formed, and bright display and the like can be achieved by using such a polarizing film for a liquid crystal panel.
【００１１】[0011]
【発明の実施の形態】図１は、本発明の１形態による偏
光フィルムの層構成を示す斜視図であり、図１（ａ）は
透過型偏光フィルム１０、図１（ｂ）は反射型偏光フィ
ルム２０を示している。FIG. 1 is a perspective view showing a layer structure of a polarizing film according to one embodiment of the present invention. FIG. 1 (a) is a transmission type polarizing film 10, and FIG. 1 (b) is a reflection type polarizing film. A film 20 is shown.
【００１２】図１（ａ）の透過型偏光フィルム１０は、
例えば、ヨウ素等の２色性物質をポリビニルアルコール
等の高分子フィルムに担持させ、一方向に延伸して２色
性物質を配列させてなる偏光子１と、その両側に積層さ
れた保護層２、２と、一方の保護層２上に設けられた表
面保護フィルム３と、他方の保護層２上に粘着層４を介
して粘着された離型フィルム５とからなるものであり、
また、図１（ｂ）の反射型偏光フィルム２０は、上記の
ような偏光子１と、その両側に積層された保護層２、２
と、一方の保護層２上に粘着層４を介して粘着された離
型フィルム５と、他方の保護層２上に粘着層４を介して
粘着された反射層６とからなるものである。The transmission type polarizing film 10 shown in FIG.
For example, a dichroic substance such as iodine is supported on a polymer film such as polyvinyl alcohol and stretched in one direction to arrange the dichroic substances, and a protective layer 2 laminated on both sides thereof. 2, a surface protective film 3 provided on one of the protective layers 2, and a release film 5 adhered on the other protective layer 2 via an adhesive layer 4.
Further, the reflective polarizing film 20 of FIG. 1B is composed of the polarizer 1 described above and the protective layers 2 and 2 laminated on both sides thereof.
And a release film 5 adhered on one protective layer 2 via an adhesive layer 4, and a reflective layer 6 adhered on the other protective layer 2 via an adhesive layer 4.
【００１３】ここで、本発明において最も重要なのは粘
着層４の構成である。Here, what is most important in the present invention is the configuration of the adhesive layer 4.
【００１４】一般的な粘着剤の屈折率は約１．４〜１．
４６であり、塗布した透明基板との屈折率差が大きい
と、透明基板と粘着層との界面で反射が生じ反射損失が
起こる。特に、入射角が５０°を越えると、反射光が急
激に増大し、反射損失が非常に大きくなる。The refractive index of a general pressure-sensitive adhesive is about 1.4 to 1.
46, when the difference in the refractive index between the applied transparent substrate and the transparent substrate is large, reflection occurs at the interface between the transparent substrate and the adhesive layer, and reflection loss occurs. In particular, when the incident angle exceeds 50 °, the reflected light sharply increases, and the reflection loss becomes extremely large.
【００１５】本出願人は、特願平１１−６０２０９号に
おいて、透明基板との屈折率差をなくすために、粘着剤
の屈折率を調整し、かつ、粘着剤の粘着力を調整するこ
とができる物質を粘着剤に対して添加してなる屈折率調
整粘着剤を提案している。In Japanese Patent Application No. 11-60209, the applicant of the present invention has proposed adjusting the refractive index of the pressure-sensitive adhesive and adjusting the adhesive force of the pressure-sensitive adhesive in order to eliminate the difference in the refractive index from the transparent substrate. There has been proposed a refractive index adjusting pressure-sensitive adhesive obtained by adding a substance which can be used to the pressure-sensitive adhesive.
【００１６】この屈折率調整粘着剤は、粘着剤４０〜９
０重量％及びタッキファイヤー樹脂１０〜６０重量％を
含むこと、好ましくは、粘着剤４０〜８０重量％及びタ
ッキファイヤー樹脂２０〜６０重量％を含むことにより
屈折率が整合されてなる粘着剤である。The refractive index adjusting pressure-sensitive adhesive is composed of pressure-sensitive adhesives 40 to 9
0% by weight and 10 to 60% by weight of the tackifier resin, preferably 40 to 80% by weight of the adhesive and 20 to 60% by weight of the tackifier resin so that the refractive index is adjusted. .
【００１７】このような屈折率調整粘着剤を用い、透明
基板と粘着層との屈折率差を減少させるように粘着層の
屈折率を整合させることにより、透明基板と粘着層との
界面での反射を防止し、その界面での反射損失、特に、
入射角が５０°以上においての反射損失を減少させるこ
とができる。By using such a refractive index adjusting adhesive, the refractive index of the adhesive layer is adjusted so as to reduce the refractive index difference between the transparent substrate and the adhesive layer, whereby the interface between the transparent substrate and the adhesive layer is reduced. Prevent reflection and return loss at the interface, especially
When the incident angle is 50 ° or more, the reflection loss can be reduced.
【００１８】本発明の偏光フィルム１０、２０において
は、その偏光フィルム１０、２０を透明体あるいは反射
体に接着するための粘着層４の粘着剤組成物として、粘
着剤４０〜９０重量％及びタッキファイヤー樹脂１０〜
６０重量％、好ましくは粘着剤４０〜９０重量％及びタ
ッキファイヤー樹脂２０〜６０重量％含んで屈折率が整
合されてなる粘着剤組成物を用いることを特徴とするも
のである。このような配合比は、通常、一般的な粘着剤
に配合して使用されるタッキファイヤー樹脂の配合量よ
りも遥かに多い量である。タッキファイヤー樹脂が１０
重量％未満であると、粘着層４の屈折率の整合機能がな
く、また６０重量％を超えると粘着層４の粘着力が減少
しすぎてしまうという不都合がある。In the polarizing films 10 and 20 of the present invention, the pressure-sensitive adhesive composition of the pressure-sensitive adhesive layer 4 for bonding the polarizing films 10 and 20 to a transparent body or a reflector is 40 to 90% by weight of a pressure-sensitive adhesive. Fire resin 10
It is characterized by using a pressure-sensitive adhesive composition having a matched refractive index containing 60% by weight, preferably 40 to 90% by weight of an adhesive and 20 to 60% by weight of a tackifier resin. Such a compounding ratio is usually much larger than the amount of the tackifier resin used in the general adhesive. 10 tackifier resin
If the amount is less than 60% by weight, there is no function of matching the refractive index of the adhesive layer 4, and if it exceeds 60% by weight, the adhesive strength of the adhesive layer 4 is excessively reduced.
【００１９】さらに、一般的な粘着剤の屈折率は約１．
４〜１．４６であり、これに対して、偏光フィルム１
０、２０の保護層４の屈折率は、前記の表−１に示した
ように、１．３５〜１．６５であることから、両者の屈
折率差が大きいため、粘着層４と保護層２の界面におい
て光反射が生じやすいという従来の問題点に関して、本
発明では、タッキファイヤー樹脂が屈折率約１．５〜
１．６５（約１．６０前後）であることから、粘着剤４
０〜９０重量％に対してタッキファイヤー樹脂１０〜６
０重量％、好ましくは、２０〜６０重量％という高含有
量配合することにより、粘着層４と保護層２との間の屈
折率差を解消させることができる。したがって、粘着層
４と保護層２との界面での光反射を防止することができ
る。Further, the refractive index of a general pressure-sensitive adhesive is about 1.
4 to 1.46, whereas the polarizing film 1
Since the refractive indexes of the protective layers 4 of 0 and 20 are 1.35 to 1.65 as shown in Table 1 above, the difference between the refractive indices of the two is large. Regarding the conventional problem that light reflection easily occurs at the interface of No. 2, in the present invention, the tackifier resin has a refractive index of about 1.5 to 1.5.
Since it is 1.65 (about 1.60), the adhesive 4
Tackifier resin 10-6 for 0-90% by weight
By blending a high content of 0% by weight, preferably 20 to 60% by weight, the difference in the refractive index between the adhesive layer 4 and the protective layer 2 can be eliminated. Therefore, light reflection at the interface between the adhesive layer 4 and the protective layer 2 can be prevented.
【００２０】しかしながら、保護層２の屈折率と粘着層
４の屈折率を整合させ、かつ、粘着剤の粘着力を所望の
範囲に調整する目的に対しては、このような性質を有す
る物質ならば必ずしもタッキファイヤー樹脂以外の如何
なる物質でも添加することができる。また、保護層２の
材料によって、種々の屈折率のものが採用されるので、
保護層２の屈折率と粘着層４の屈折率を整合させる目的
に対しては、屈折率を調整できる物質が、タッキファイ
ヤー樹脂のように、粘着剤の屈折率よりも必ずしも高い
ものである必然性はない。また、粘着剤の屈折率よりも
高い屈折率の物質と低い屈折率の物質を併用して粘着剤
に添加してもよい。要は、保護層２の屈折率と粘着層４
の屈折率を整合させて、界面反射を防止でき、かつ、粘
着剤に添加したときに保護層２に対して粘着層４が適度
な粘着性（すなわち、貼着時には貼着容易であり、貼着
力を保持できる性質）となり、耐久性が良い物質であれ
ばよい。However, for the purpose of matching the refractive index of the protective layer 2 with the refractive index of the adhesive layer 4 and adjusting the adhesive force of the adhesive to a desired range, a material having such properties is required. If necessary, any substance other than the tackifier resin can be added. In addition, since various refractive indexes are adopted depending on the material of the protective layer 2,
For the purpose of matching the refractive index of the protective layer 2 with the refractive index of the adhesive layer 4, it is necessary that a substance capable of adjusting the refractive index is necessarily higher than the refractive index of the adhesive, such as tackifier resin. There is no. Further, a substance having a higher refractive index and a substance having a lower refractive index than the refractive index of the pressure-sensitive adhesive may be added to the pressure-sensitive adhesive in combination. In short, the refractive index of the protective layer 2 and the adhesive layer 4
Of the adhesive layer 4 to prevent interfacial reflection, and when the adhesive layer 4 is added to the adhesive, the adhesive layer 4 has an appropriate adhesiveness to the protective layer 2 (that is, it is easy to stick when sticking, Any substance can be used as long as it is a substance that has good durability.
【００２１】本発明の粘着層４の形成に使用される粘着
剤としては、アクリル樹脂、アクリル酸エステル樹脂、
またはこれらの共重合体、スチレン−ブタジエン共重合
体、天然ゴム、カゼイン、ゼラチン、ロジンエステル、
テルペン樹脂、フェノール系樹脂、スチレン系樹脂、ク
ロマンインデン樹脂、ポリビニルエーテル、シリコーン
樹脂等、また、アルファーシアノアクリレート系、シリ
コーン系、マレイミド系、スチロール系、ポリオレフィ
ン系、レゾルシノール系、ポリビニルエーテル系、シリ
コーン系接着剤があげられる。また、粘着剤層が、使用
時にイソシアネート系架橋剤、金属キレート系架橋剤等
を添加して架橋する、所謂二液架橋型粘着剤を使用して
形成することもできる。また、粘着剤層としてヒートシ
ール剤を使用してもよく、例えば、エチレン―酢酸ビニ
ル共重合樹脂、ポリアミド樹脂、ポリエステル樹脂、ポ
リエチレン樹脂、エチレン−イソブチルアクリレート共
重合樹脂、ブチラール樹脂、ポリ酢酸ビニル及びその共
重合体、セルロース誘導体、ポリメチルメクタリレー
ト、ポリビニルエーテル樹脂、ポリウレタン樹脂、ポリ
カーボネート樹脂、ポリプロピレン樹脂、エポキシ樹
脂、フェノール樹脂、ＳＢＳ、ＳＩＳ、ＳＥＢＳ、ＳＥ
ＰＳ等の熱可塑性エラストマー、又は反応ホットメルト
系樹脂等があげられる。粘着剤層の厚みとしては、４μ
ｍ〜２５μｍとするとよい。The pressure-sensitive adhesive used for forming the pressure-sensitive adhesive layer 4 of the present invention includes an acrylic resin, an acrylate resin,
Or copolymers thereof, styrene-butadiene copolymer, natural rubber, casein, gelatin, rosin ester,
Terpene resin, phenolic resin, styrene resin, chromanindene resin, polyvinyl ether, silicone resin, etc.Also, alpha-cyanoacrylate type, silicone type, maleimide type, styrene type, polyolefin type, resorcinol type, polyvinyl ether type, silicone type Adhesives. The pressure-sensitive adhesive layer can also be formed by using a so-called two-component cross-linking pressure-sensitive adhesive which is crosslinked by adding an isocyanate-based cross-linking agent, a metal chelate-based cross-linking agent or the like at the time of use. Further, a heat sealant may be used as the pressure-sensitive adhesive layer, for example, ethylene-vinyl acetate copolymer resin, polyamide resin, polyester resin, polyethylene resin, ethylene-isobutyl acrylate copolymer resin, butyral resin, polyvinyl acetate and The copolymer, cellulose derivative, polymethyl methacrylate, polyvinyl ether resin, polyurethane resin, polycarbonate resin, polypropylene resin, epoxy resin, phenol resin, SBS, SIS, SEBS, SE
Examples thereof include thermoplastic elastomers such as PS, and reactive hot melt resins. The thickness of the adhesive layer is 4μ
m to 25 μm.
【００２２】粘着層４に使用される粘着剤組成物に含ま
れるタッキファイヤー樹脂（粘着付与剤）としては、ロ
ジン系タッキファイヤー樹脂、テルペン系タッキファイ
ヤー樹脂、合成樹脂系タッキファイヤー、又はそれらの
混合物を用いることができる。The tackifier resin (tackifier) contained in the pressure-sensitive adhesive composition used for the pressure-sensitive adhesive layer 4 includes a rosin-based tackifier resin, a terpene-based tackifier resin, a synthetic resin-based tackifier, or a mixture thereof. Can be used.
【００２３】ロジン系タッキファイヤー樹脂としては、
例えば、ガムロジン、トール油ロジン、ウッドロジン、
水素添加ロジン、エステル化ロジン、二量化ロジン、多
量化ロジン、ライム化ロジン等のロジン系タッキファイ
ヤー〔例えば、ペトロジン♯８０（商品名、三井化油化
学社製）、屈折率１．５６（４８６ｎｍ）〕があげられ
る。また、テルペン系タッキファイヤー樹脂としては、
α−ピネン、βーピネンカンフェル、ジペンテン等の環
状テルペンを含むテルペン樹脂、テルペンフェノール樹
脂、芳香族変性テルペン等のテルペン系タッキファイヤ
ー、炭素数５の石油留分を重合して得られる炭素数５の
合成樹脂系タッキファイヤーで、イソプレン、シクロペ
ンタジエン、１，３―ペンタジエン、１ーペンテンの共
重合体、２−ペンテン、ジシクロペンタジエンの共重合
体、１，３―ペンタジエン主体の樹脂等の合成樹脂系タ
ッキファイヤー、炭素数６〜１１の石油留分を重合して
得られる炭素数９の合成樹脂系タッキファイヤーで、イ
ンデン、スチレン、メチルインデン、αーメチルスチレ
ンの共重合体等の合成樹脂系タッキファイヤー、キシレ
ン系タッキファイヤー〔例えば、パインクリスタル Ｋ
Ｅ−１００（商品名、荒川化学社製）、屈折率１．５９
（４８６ｎｍ）〕があげられる。これらのタキファイヤ
ー樹脂の屈折率は約１．５〜１．６５の範囲にある。タ
ッキファイヤー樹脂の使用量は、屈折率の大きいものは
添加量が少なくてすむので有利である。As the rosin-based tackifier resin,
For example, gum rosin, tall oil rosin, wood rosin,
Rosin-based tackifiers such as hydrogenated rosin, esterified rosin, dimerized rosin, multimerized rosin, and lime rosin [for example, Petrosin # 80 (trade name, manufactured by Mitsui Chemicals, Inc.), refractive index 1.56 (486 nm) )]. In addition, as terpene-based tackifier resin,
Terpene resins including cyclic terpenes such as α-pinene, β-pinene camphor, dipentene, terpene phenolic resins, terpene-based tackifiers such as aromatic modified terpenes, and carbon number obtained by polymerizing a petroleum fraction having 5 carbon atoms 5. Synthesizing isoprene, cyclopentadiene, 1,3-pentadiene, 1-pentene copolymer, 2-pentene, dicyclopentadiene copolymer, 1,3-pentadiene-based resin, etc. Resin tackifier, a synthetic resin tackifier having 9 carbon atoms obtained by polymerizing a petroleum fraction having 6 to 11 carbon atoms, such as a copolymer of indene, styrene, methylindene, and α-methylstyrene. Fire, xylene-based tackifier [for example, Pine Crystal K
E-100 (trade name, manufactured by Arakawa Chemical Co., Ltd.), refractive index 1.59
(486 nm)]. The index of refraction of these tackifier resins ranges from about 1.5 to 1.65. The use amount of the tackifier resin is advantageous because a resin having a large refractive index requires a small amount of addition.
【００２４】しかしながら、粘着層４の粘着性と、粘着
剤に対するタッキファイヤー樹脂の相溶性との兼ね合
い、かつ、保護層２の屈折率と粘着層４の屈折率を整合
させる総合的な観点で好ましいタッキファイヤーとその
添加量が決定される。However, this is preferable from the viewpoint of balancing the adhesiveness of the adhesive layer 4 with the compatibility of the tackifier resin with the adhesive, and matching the refractive index of the protective layer 2 with the refractive index of the adhesive layer 4. The tackifier and the amount added are determined.
【００２５】保護層２の屈折率と粘着層４の屈折率を整
合させ、屈折率を適宜な値に容易に調整する目的のため
に、前記タッキファイヤー樹脂以外の粘着剤の屈折率よ
りも高い屈折率を持つ物質を添加してもよい。このよう
な物質には、例えば、芳香族化合物があげられ、さらに
具体的には、３−フェニルピリジン、２−フェニルピリ
ジン、ジフェニルスルフィド、１，１−ジフェニルエチ
レン、１′−ジアセトナフトン、１−ナフトアルデヒド
等があげられるが、そのヨウ素化物、臭化物であっても
よく、例えば、１−ブロモナフタレン、１，２−ジブロ
モベンゼン、３−ヨードアニリン等があげられる。For the purpose of matching the refractive index of the protective layer 2 and the refractive index of the adhesive layer 4 and easily adjusting the refractive index to an appropriate value, the refractive index of the adhesive other than the tackifier resin is higher than that of the tackifier resin. A substance having a refractive index may be added. Examples of such a substance include an aromatic compound, and more specifically, 3-phenylpyridine, 2-phenylpyridine, diphenylsulfide, 1,1-diphenylethylene, 1'-diacetonaphthone, and 1-naphtho. Aldehyde and the like may be mentioned, and their iodides and bromides may also be mentioned, for example, 1-bromonaphthalene, 1,2-dibromobenzene, 3-iodoaniline and the like.
【００２６】保護層２の屈折率と粘着層４の屈折率を整
合させ、屈折率を適宜な値に容易に調整する目的のため
に、粘着剤の屈折率よりも低い屈折率を持つ物質を添加
してもよい。このような物質には、例えば、屈折率が
１．４以下のシリコーン系化合物、フッ素系化合物等が
あげられる。For the purpose of matching the refractive index of the protective layer 2 with the refractive index of the adhesive layer 4 and easily adjusting the refractive index to an appropriate value, a substance having a refractive index lower than that of the adhesive is used. It may be added. Examples of such a substance include a silicone compound and a fluorine compound having a refractive index of 1.4 or less.
【００２７】該シリコーン系化合物としては、例えば、
アミノ変性シリコーンオイル、エポキシ変性シリコーン
オイル、カルボキシ変性シリコーンオイル、メタクリル
変性シリコーンオイル、フッ素変性シリコーンオイル等
のシリコーンオイルがあげられ、このような化合物の商
品としては、例えば、信越化学工業（株）製「ＫＦ−８
５８、屈折率１．３９４」、同「ＫＦ９６−１０、屈折
率１．３９９」、同「ＫＦ９６Ｌ−１、屈折率１．３８
２」等があげられる。また、トリメチルクロロシラン、
メチルトリメトキシシラン、メチルトリエトキシシラ
ン、ジメチルジメトキシシラン、トリメチルメトキシシ
ラン等のシラン化合物、又は混合物があげられる。As the silicone compound, for example,
Silicone oils such as amino-modified silicone oil, epoxy-modified silicone oil, carboxy-modified silicone oil, methacryl-modified silicone oil, fluorine-modified silicone oil and the like can be mentioned. Commercial products of such compounds include, for example, Shin-Etsu Chemical Co., Ltd. "KF-8
58, refractive index 1.394 ", the same" KF96-10, refractive index 1.399 ", the same" KF96L-1, refractive index 1.38 "
2 "and the like. Also, trimethylchlorosilane,
Examples thereof include silane compounds such as methyltrimethoxysilane, methyltriethoxysilane, dimethyldimethoxysilane, and trimethylmethoxysilane, and mixtures thereof.
【００２８】また、フッ素系化合物としては、テトラフ
ルオロ酢酸、クロロトリフルオロエチレン、トリフルオ
ロメチルベンズアルデヒド、１，４−ビストリフルオロ
メチルベンゼン、トリフルオロメチルベンジルアルコー
ル、また、これら誘導体、又は混合物があげられる。Examples of the fluorine compound include tetrafluoroacetic acid, chlorotrifluoroethylene, trifluoromethylbenzaldehyde, 1,4-bistrifluoromethylbenzene, trifluoromethylbenzyl alcohol, and derivatives or mixtures thereof. .
【００２９】上記のような屈折率調整粘着剤の選定基準
は、まず第１に、保護層２との間の屈折率差が少ないこ
とであり、それに加えて、接着力、貼着作業性、透過
率、耐久性が良いこと等である。The criteria for selecting the refractive index adjusting adhesive as described above are, first of all, that the difference in refractive index between the protective layer 2 and the protective layer 2 is small. Good transmittance and durability.
【００３０】なお、偏光フィルム１０、２０の離型フィ
ルム５としては、保護層２との剥離強度の関係が、 〔保護層／粘着層〕＞〔粘着層／離型フィルム〕 の関係にあるものを選ぶ必要がある。The release film 5 of the polarizing films 10 and 20 has a peel strength relationship with the protective layer 2 in the following relationship: [protective layer / adhesive layer]> [adhesive layer / release film]. You need to choose
【００３１】本発明に基づいて粘着層４の屈折率が保護
層２の屈折率と差がないように調整することにより、保
護層２と粘着層４の境界での界面反射光を低減すること
ができ、光の利用効率を高めることができる。例えば、
保謹層２がアクリル樹脂フィルムの場合、保護層２と粘
着層４の屈折率差とその界面での反射率の関係は、図２
に示すようになる。特に屈折率差が０．１以下の場合
に、反射率低減の効果が著しく大きいことが分かる。By adjusting the refractive index of the adhesive layer 4 so as not to be different from the refractive index of the protective layer 2 according to the present invention, the interface reflected light at the boundary between the protective layer 2 and the adhesive layer 4 can be reduced. And the light use efficiency can be improved. For example,
When the protective layer 2 is an acrylic resin film, the relationship between the refractive index difference between the protective layer 2 and the adhesive layer 4 and the reflectance at the interface is shown in FIG.
It becomes as shown in. In particular, when the refractive index difference is 0.1 or less, the effect of reducing the reflectance is remarkably large.
【００３２】ところで、図１（ａ）に示したような透過
型偏光フィルム１０と、図１（ｂ）に示したような反射
型偏光フィルム２０とを用いて、図３に示すような構成
の反射型液晶パネルを構成することができる。すなわ
ち、偏光フィルム１０、２０の保護層２と同様のプラス
チック材料からなる透明基板３１と３２の対向する表面
にそれぞれ透明電極３４、３５を設け、その上に配向膜
を設けて、その間のギャップにツイストネマチック液晶
のような液晶層３３を挟持させ、周囲を封止して構成さ
れているプラスチック液晶パネル３０の前面側の透明基
板３１表面に、図１（ａ）の透過型偏光フィルム１０の
離型フィルム５を剥離して露出した粘着層４を介してそ
の透過型偏光フィルム１０を粘着すると共に、プラスチ
ック液晶パネル３０の背面側の透明基板３２表面に、図
１（ｂ）の反射型偏光フィルム２０の離型フィルム５を
剥離して露出した粘着層４を介してその反射型偏光フィ
ルム２０を粘着することによって、図示のような構成の
反射型の液晶パネルを構成することができる。このよう
な反射型液晶パネルにおいては、保護層２及び液晶パネ
ル３０の透明基板３１、３２と粘着層４との屈折率差が
殆どないように調整されているので、偏光フィルム１
０、２０と液晶パネル３０の界面での反射が入射角が大
きい場合でも小さくなるので、明るい表示等が可能にな
る。By the way, using the transmission type polarizing film 10 as shown in FIG. 1A and the reflection type polarizing film 20 as shown in FIG. 1B, the structure as shown in FIG. A reflective liquid crystal panel can be configured. That is, transparent electrodes 34 and 35 are provided on opposing surfaces of transparent substrates 31 and 32 made of the same plastic material as the protective layer 2 of the polarizing films 10 and 20, respectively, and an alignment film is provided thereon, and a gap between them is provided. A liquid crystal layer 33 such as a twisted nematic liquid crystal is sandwiched therebetween, and the periphery of the liquid crystal layer 33 is sealed on the surface of the transparent substrate 31 on the front side of the plastic liquid crystal panel 30. The transmissive polarizing film 10 is adhered through the adhesive layer 4 exposed by peeling off the mold film 5, and the reflective polarizing film of FIG. 1B is attached to the surface of the transparent substrate 32 on the back side of the plastic liquid crystal panel 30. By sticking the reflective polarizing film 20 through the adhesive layer 4 exposed by peeling off the release film 5 of FIG. Panel can be constructed. In such a reflective liquid crystal panel, since the refractive index difference between the protective layer 2 and the transparent substrates 31 and 32 of the liquid crystal panel 30 and the adhesive layer 4 is adjusted to be almost zero, the polarizing film 1
Since the reflection at the interface between the liquid crystal panel 30 and the liquid crystal panel 30 becomes small even when the incident angle is large, a bright display or the like is possible.
【００３３】次に、本発明の偏光フィルムの実施例につ
いて説明する。Next, examples of the polarizing film of the present invention will be described.
【００３４】〔実施例１〕図１（ａ）の構成の透過型偏
光フィルム１０を作製する。粘着層４以外の構成素材
は、以下に示すような一般的に用いられる材料及び方法
によって作製される。Example 1 A transmission type polarizing film 10 having the structure shown in FIG. The constituent materials other than the adhesive layer 4 are produced by commonly used materials and methods as described below.
【００３５】偏光子１：２色性物質を吸着したＰＶＡフ
ィルムをホウ酸等の溶液中で一方向に延伸する。Polarizer 1: A PVA film on which a dichroic substance is adsorbed is stretched in one direction in a solution such as boric acid.
【００３６】保護層２：アクリル樹脂フィルム 屈折率
１．５１ 表面保護フィルム３：ＰＥＴ 離型フィルム５：ＰＥＴ 粘着層４：アクリル系粘着剤ＳＫダイン１６０４Ｎ（商
品名：綜研化学社製）とキシレン系タッキファイヤー樹
脂であるパインクリスタルＫＥ−１００（商品名：荒川
化学社製、屈折率１．５９）を６５対３５の重量比率で
混合し、さらに、エポキシ系硬化剤であるＥ−ＡＸ（商
品名：綜研化学社製）を３．０重量％添加して、屈折率
１．５１の屈折率整合粘着剤を得る。Protective layer 2: Acrylic resin film Refractive index 1.51 Surface protective film 3: PET release film 5: PET adhesive layer 4: Acrylic adhesive SK Dyne 1604N (trade name: Soken Chemical Co., Ltd.) and xylene type Pine crystal KE-100 (trade name: Arakawa Chemical Co., Ltd., refractive index 1.59) which is a tackifier resin is mixed at a weight ratio of 65:35, and E-AX (trade name) which is an epoxy-based curing agent is mixed. : 3.0% by weight of Soken Chemical Co., Ltd.) to obtain a refractive index matching adhesive having a refractive index of 1.51.
【００３７】上記タッキファイヤー樹脂を添加せず、上
記粘着剤と硬化剤のみの揚合は、屈折率１．４６であ
る。The refractive index of the combination of the pressure-sensitive adhesive and the curing agent alone without adding the tackifier resin is 1.46.
【００３８】偏光子１と保護層２を貼り合わせ、さらに
その保護層２側に上記屈折率整合粘着剤を約２０μｍ塗
布して粘着層４とし、その上に離型フィルム５を貼り合
わせ、透過型偏光フィルム１０を作製した。The polarizer 1 and the protective layer 2 are bonded together, and the above-mentioned refractive index matching adhesive is applied to the protective layer 2 side at about 20 μm to form an adhesive layer 4, on which a release film 5 is bonded and transmitted. A polarizing film 10 was prepared.
【００３９】このようにして作製した透過型偏光フィル
ム１０の離型フィルム５を剥がし、ガラス板（材質：１
７３７無アルカリガラス：コーニング社製）に貼り付け
る。得られた偏光フィルム板の表面保護フィルム３側か
ら、波長５８９ｎｍのレーザー光を入射させ、入射角０
°〜７０°の範囲での透過率を測定した。ただし、入射
光は偏光子１の偏光方向と平行な直線偏光を有する。The release film 5 of the transmission type polarizing film 10 thus produced was peeled off, and a glass plate (material: 1
737 non-alkali glass: manufactured by Corning Incorporated). A laser beam having a wavelength of 589 nm was incident from the surface protective film 3 side of the obtained polarizing film plate, and the incident angle was 0 °.
The transmittance in the range of ° to 70 ° was measured. However, the incident light has a linear polarization parallel to the polarization direction of the polarizer 1.
【００４０】上記のタッキファイヤー樹脂を添加しない
で粘着剤と硬化剤のみからなる粘着層を用いた同様の構
成の透過型偏光フィルムについても、同様の測定をし、
両者を比較した。それらの結果を表−２に示す。The same measurement was performed on a transmission-type polarizing film having the same configuration using an adhesive layer composed of only an adhesive and a curing agent without adding the tackifier resin.
Both were compared. Table 2 shows the results.
【００４１】 [0041]
【００４２】上記表−２によれば、通常の粘着剤と硬化
剤のみを用いた場合と比べて、特に入射角度が大きい程
透過率が相対的に大きくなることが分かる。According to the above Table 2, it can be seen that the transmittance becomes relatively larger as the incident angle becomes larger as compared with the case where only the usual pressure-sensitive adhesive and hardener are used.
【００４３】〔実施例２〕図１（ｂ）の構成の反射型偏
光フィルム２０を作製する。実施例１と同様の材料を用
いて反射型フィルム２０を作製した。ただし、反射層６
は、アルミニウム蒸着ポリエステルフィルム、アルミニ
ウム箔複合ポリエステルフィルム、真珠顔料コーティン
グポリエステルフィルム等を用いる。この実施例では、
アルミニウム蒸着ポリエステルフィルムを用いる。Example 2 A reflective polarizing film 20 having the structure shown in FIG. A reflective film 20 was produced using the same materials as in Example 1. However, the reflection layer 6
For example, an aluminum vapor-deposited polyester film, an aluminum foil composite polyester film, a pearl pigment coated polyester film, or the like is used. In this example,
An aluminum evaporated polyester film is used.
【００４４】入射角２０°〜７０°の範囲での正反射光
の反射率を測定した。この場合も、タッキファイヤー樹
脂を添加しないで粘着剤と硬化剤のみからなる粘着層を
用いた同様の構成の反射型偏光フィルムについても、同
様の測定をし、両者を比較した。それらの結果を表−３
に示す。The reflectance of the specularly reflected light in the range of the incident angle from 20 ° to 70 ° was measured. Also in this case, the same measurement was performed on a reflective polarizing film having the same configuration using an adhesive layer consisting of an adhesive and a curing agent without adding a tackifier resin, and the two were compared. Table 3 shows the results.
Shown in
【００４５】 [0045]
【００４６】表−３によれば、通常の粘着剤と硬化剤の
みを用いた場合と比べて、反射率がより大きいことが分
かる。According to Table 3, it can be seen that the reflectance is higher than that in the case where only the usual pressure-sensitive adhesive and hardener are used.
【００４７】反射型の場合は、透過型に比べて粘着層４
と保護層２の界面が１つ多く、また、それぞれの界面を
光線が２回ずつ透過するため、反射損失の影響が大さ
い。そのため、本発明の効果がより大きくなる。In the case of the reflection type, the adhesive layer 4 is larger than that of the transmission type.
And the protective layer 2 has one more interface, and the light is transmitted twice through each interface, so that the influence of the reflection loss is large. Therefore, the effect of the present invention is further enhanced.
【００４８】以上、本発明の偏光フィルム及びその偏光
フィルムを用いた液晶パネルを実施例に基づいて説明し
てきたが、本発明はこれら実施例に限定されず種々の変
形が可能である。As described above, the polarizing film of the present invention and the liquid crystal panel using the polarizing film have been described based on the embodiments. However, the present invention is not limited to these embodiments, and various modifications are possible.
【００４９】[0049]
【発明の効果】以上の説明から明らかなように、本発明
の偏光フィルム及びその偏光フィルムを用いた液晶パネ
ルによると、偏光子上の少なくとも一方の保護層上に粘
着層を有する偏光フィルムのその粘着層として保護層と
屈折率を整合させた屈折率調整粘着剤を用いているの
で、保護層と粘着層の境界での界面反射光を低減するこ
とができ、光の利用効率を高めることができる。したが
って、明るい透過型及び反射型偏光フィルムを構成する
ことができ、そのような偏光フィルムを液晶パネルに用
いることにより明るい表示等が可能になる。As is clear from the above description, according to the polarizing film of the present invention and the liquid crystal panel using the polarizing film, the polarizing film having an adhesive layer on at least one protective layer on the polarizer has the following advantages. Since a refractive index adjusting adhesive whose refractive index is matched with that of the protective layer is used as the adhesive layer, the reflected light at the interface between the protective layer and the adhesive layer can be reduced, and the light use efficiency can be increased. it can. Therefore, bright transmissive and reflective polarizing films can be formed, and bright display and the like can be achieved by using such a polarizing film for a liquid crystal panel.
【図１】本発明の１形態による偏光フィルムの層構成を
示す斜視図である。FIG. 1 is a perspective view showing a layer configuration of a polarizing film according to one embodiment of the present invention.
【図２】本発明の１具体例における保護層と粘着層の屈
折率差とその界面での反射率の関係を示す図である。FIG. 2 is a diagram showing the relationship between the refractive index difference between a protective layer and an adhesive layer and the reflectance at the interface in one specific example of the present invention.
【図３】図１の透過型偏光フィルムと反射型偏光フィル
ムとを用いた反射型液晶パネルの構成を示す断面図であ
る。FIG. 3 is a cross-sectional view showing a configuration of a reflection type liquid crystal panel using the transmission type polarization film and the reflection type polarization film of FIG.
１…偏光子 ２…保護層 ３…表面保護フィルム ４…粘着層 ５…離型フィルム ６…反射層 １０…透過型偏光フィルム ２０…反射型偏光フィルム ３０…プラスチック液晶パネル ３１、３２…透明基板 ３３…液晶層 ３４、３５…透明電極 DESCRIPTION OF SYMBOLS 1 ... Polarizer 2 ... Protective layer 3 ... Surface protective film 4 ... Adhesive layer 5 ... Release film 6 ... Reflective layer 10 ... Transmissive polarizing film 20 ... Reflective polarizing film 30 ... Plastic liquid crystal panel 31, 32 ... Transparent substrate 33 ... liquid crystal layers 34, 35 ... transparent electrodes
───────────────────────────────────────────────────── フロントページの続き (72)発明者 植田 健治 東京都新宿区市谷加賀町一丁目１番１号 大日本印刷株式会社内 Ｆターム(参考） 2H049 BA02 BA27 BB28 BB43 BB51 BC03 BC22 2H091 FA08X FA08Z FA14Z FB08 FC02 FC08 FD15 GA16 GA17 KA01 LA03 LA18 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kenji Ueda 1-1-1 Ichigaya-Kaga-cho, Shinjuku-ku, Tokyo F-term in Dai Nippon Printing Co., Ltd. (reference) 2H049 BA02 BA27 BB28 BB43 BB51 BC03 BC22 2H091 FA08X FA08Z FA14Z FB08 FC02 FC08 FD15 GA16 GA17 KA01 LA03 LA18
Claims (5)
粘着層を有する偏光フィルムにおいて、前記粘着層とし
て、前記保護層と屈折率を整合させた屈折率調整粘着剤
を用いたことを特徴とする偏光フィルム。1. A polarizing film having an adhesive layer on at least one protective layer on a polarizer, wherein a refractive index adjusting adhesive whose refractive index is matched with that of the protective layer is used as the adhesive layer. Polarizing film.
９０重量％及びタッキファイヤー樹脂１０〜６０重量％
を含むことにより屈折率が整合されてなる粘着剤組成物
からなることを特徴とする請求項１記載の偏光フィル
ム。2. The pressure-sensitive adhesive according to claim 1, wherein
90% by weight and 10-60% by weight of tackifier resin
The polarizing film according to claim 1, comprising a pressure-sensitive adhesive composition having a refractive index matched by including the following.
ルムが粘着され、透過型偏光フィルムとして構成されて
いることを特徴とする請求項１又は２記載の偏光フィル
ム。3. The polarizing film according to claim 1, wherein a release film is adhered via the refractive index adjusting adhesive to constitute a transmission type polarizing film.
護層上に離型フィルムが粘着され、前記屈折率調整粘着
剤を介して他方の保護層上に反射層が粘着され、反射型
偏光フィルムとして構成されていることを特徴とする請
求項１又は２記載の偏光フィルム。4. A reflective film is adhered on one protective layer via the refractive index adjusting adhesive, and a reflective layer is adhered on the other protective layer via the refractive index adjusting adhesive. The polarizing film according to claim 1, wherein the polarizing film is configured as a polarizing film.
フィルムを前記粘着層を介して液晶セルを構成する透明
基板に粘着してなることを特徴とする液晶パネル。5. A liquid crystal panel, wherein the polarizing film according to claim 1 is adhered to a transparent substrate constituting a liquid crystal cell via the adhesive layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000134368A JP4471184B2 (en) | 2000-04-26 | 2000-05-08 | Polarizing film and liquid crystal panel using the polarizing film |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000126078 | 2000-04-26 | ||
| JP2000-126078 | 2000-04-26 | ||
| JP2000134368A JP4471184B2 (en) | 2000-04-26 | 2000-05-08 | Polarizing film and liquid crystal panel using the polarizing film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002014225A true JP2002014225A (en) | 2002-01-18 |
| JP4471184B2 JP4471184B2 (en) | 2010-06-02 |
Family
ID=26590862
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000134368A Expired - Fee Related JP4471184B2 (en) | 2000-04-26 | 2000-05-08 | Polarizing film and liquid crystal panel using the polarizing film |
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| JP (1) | JP4471184B2 (en) |
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