JP2003050318A - Iodine type polarizing plate and method for manufacturing the same - Google Patents
Iodine type polarizing plate and method for manufacturing the sameInfo
- Publication number
- JP2003050318A JP2003050318A JP2002132538A JP2002132538A JP2003050318A JP 2003050318 A JP2003050318 A JP 2003050318A JP 2002132538 A JP2002132538 A JP 2002132538A JP 2002132538 A JP2002132538 A JP 2002132538A JP 2003050318 A JP2003050318 A JP 2003050318A
- Authority
- JP
- Japan
- Prior art keywords
- polarizing plate
- zinc
- iodine
- polyvinyl alcohol
- resin film
- 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.)
- Granted
Links
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 239000011630 iodine Substances 0.000 title claims abstract description 50
- 229910052740 iodine Inorganic materials 0.000 title claims abstract description 50
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 6
- 238000000034 method Methods 0.000 title abstract description 12
- 239000011701 zinc Substances 0.000 claims abstract description 57
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 57
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 52
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 52
- 239000011347 resin Substances 0.000 claims abstract description 43
- 229920005989 resin Polymers 0.000 claims abstract description 43
- 239000000853 adhesive Substances 0.000 claims abstract description 35
- 230000001070 adhesive effect Effects 0.000 claims abstract description 35
- 230000001681 protective effect Effects 0.000 claims abstract description 27
- 239000012790 adhesive layer Substances 0.000 claims abstract description 21
- 239000007787 solid Substances 0.000 claims abstract description 7
- 238000004458 analytical method Methods 0.000 claims description 9
- 239000000523 sample Substances 0.000 claims description 6
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 abstract description 20
- 239000004327 boric acid Substances 0.000 abstract description 20
- 238000010306 acid treatment Methods 0.000 abstract description 9
- 150000003751 zinc Chemical class 0.000 abstract description 6
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 239000007864 aqueous solution Substances 0.000 description 12
- NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Chemical compound [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 description 12
- 238000004043 dyeing Methods 0.000 description 9
- 239000011592 zinc chloride Substances 0.000 description 7
- 235000005074 zinc chloride Nutrition 0.000 description 7
- 239000010410 layer Substances 0.000 description 6
- 239000000243 solution Substances 0.000 description 5
- 238000001035 drying Methods 0.000 description 4
- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical compound II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 description 4
- 229920002284 Cellulose triacetate Polymers 0.000 description 3
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 3
- NNLVGZFZQQXQNW-ADJNRHBOSA-N [(2r,3r,4s,5r,6s)-4,5-diacetyloxy-3-[(2s,3r,4s,5r,6r)-3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6s)-4,5,6-triacetyloxy-2-(acetyloxymethyl)oxan-3-yl]oxyoxan-2-yl]methyl acetate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](OC(C)=O)[C@H]1OC(C)=O)O[C@H]1[C@@H]([C@@H](OC(C)=O)[C@H](OC(C)=O)[C@@H](COC(C)=O)O1)OC(C)=O)COC(=O)C)[C@@H]1[C@@H](COC(C)=O)O[C@@H](OC(C)=O)[C@H](OC(C)=O)[C@H]1OC(C)=O NNLVGZFZQQXQNW-ADJNRHBOSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 238000002845 discoloration Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- 229920002689 polyvinyl acetate Polymers 0.000 description 3
- 239000011118 polyvinyl acetate Substances 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 238000007127 saponification reaction Methods 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- ONDPHDOFVYQSGI-UHFFFAOYSA-N zinc nitrate Chemical compound [Zn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ONDPHDOFVYQSGI-UHFFFAOYSA-N 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- ZNZYKNKBJPZETN-WELNAUFTSA-N Dialdehyde 11678 Chemical compound N1C2=CC=CC=C2C2=C1[C@H](C[C@H](/C(=C/O)C(=O)OC)[C@@H](C=C)C=O)NCC2 ZNZYKNKBJPZETN-WELNAUFTSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- DKNPRRRKHAEUMW-UHFFFAOYSA-N Iodine aqueous Chemical compound [K+].I[I-]I DKNPRRRKHAEUMW-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 239000004695 Polyether sulfone Substances 0.000 description 1
- 239000004820 Pressure-sensitive adhesive Substances 0.000 description 1
- QYKIQEUNHZKYBP-UHFFFAOYSA-N Vinyl ether Chemical class C=COC=C QYKIQEUNHZKYBP-UHFFFAOYSA-N 0.000 description 1
- 235000010724 Wisteria floribunda Nutrition 0.000 description 1
- PTFCDOFLOPIGGS-UHFFFAOYSA-N Zinc dication Chemical compound [Zn+2] PTFCDOFLOPIGGS-UHFFFAOYSA-N 0.000 description 1
- DHKHKXVYLBGOIT-UHFFFAOYSA-N acetaldehyde Diethyl Acetal Natural products CCOC(C)OCC DHKHKXVYLBGOIT-UHFFFAOYSA-N 0.000 description 1
- 150000001241 acetals Chemical class 0.000 description 1
- 125000002339 acetoacetyl group Chemical group O=C([*])C([H])([H])C(=O)C([H])([H])[H] 0.000 description 1
- 239000003522 acrylic cement Substances 0.000 description 1
- 150000001299 aldehydes Chemical group 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 238000004380 ashing Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 229920002301 cellulose acetate Polymers 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 229920005994 diacetyl cellulose Polymers 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000000705 flame atomic absorption spectrometry Methods 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 238000007602 hot air drying Methods 0.000 description 1
- 229940077844 iodine / potassium iodide Drugs 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229920000636 poly(norbornene) polymer Polymers 0.000 description 1
- 229920001230 polyarylate Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920006393 polyether sulfone Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 150000003460 sulfonic acids Chemical class 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- -1 zinc halides Chemical class 0.000 description 1
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 1
- 229960001763 zinc sulfate Drugs 0.000 description 1
- 229910000368 zinc sulfate Inorganic materials 0.000 description 1
Landscapes
- Polarising Elements (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ヨウ素が吸着配向
された偏光板及びその製造方法に関するものである。詳
しくは、ポリビニルアルコール系樹脂フィルムにヨウ素
が吸着配向されたいわゆるヨウ素系偏光フィルムを用い
た偏光板に関するものである。TECHNICAL FIELD The present invention relates to a polarizing plate in which iodine is adsorbed and oriented, and a method for producing the same. Specifically, the present invention relates to a polarizing plate using a so-called iodine-based polarizing film in which iodine is adsorbed and oriented on a polyvinyl alcohol-based resin film.
【０００２】[0002]
【従来の技術】現在一般に、ポリビニルアルコールにヨ
ウ素を吸着配向せしめたヨウ素系フィルムや、ポリビニ
ルアルコールに二色性染料を吸着配向せしめた染料系フ
ィルムを偏光子として用い、その偏光子の少なくとも片
面に接着剤層を介してトリアセチルセルロースなどから
なる保護フィルムを貼合した構成のヨウ素系偏光板又は
染料系偏光板が用いられている。これらのうち、ヨウ素
系偏光板は、染料系偏光板と比較して、高透過率で高偏
光度、すなわち高コントラストを示すことから、広く用
いられている。しかしながら、ヨウ素系偏光板は、光学
特性の面では染料系偏光板に勝っているものの、光学耐
久性の面では染料系偏光板に劣っており、例えば、ヨウ
素系偏光板を乾熱下に放置すると、透過率が低下したり
偏光板が変色したりするなどの問題が生じていた。2. Description of the Related Art Currently, an iodine film in which polyvinyl alcohol is adsorbed and oriented with iodine or a dye film in which polyvinyl alcohol is adsorbed and oriented with a dichroic dye is used as a polarizer, and at least one side of the polarizer is used. An iodine-based polarizing plate or a dye-based polarizing plate having a structure in which a protective film made of triacetyl cellulose or the like is attached via an adhesive layer is used. Among these, the iodine type polarizing plate is widely used because it has a high transmittance and a high degree of polarization, that is, a high contrast, as compared with the dye type polarizing plate. However, although iodine-based polarizing plates are superior to dye-based polarizing plates in terms of optical characteristics, they are inferior to dye-based polarizing plates in terms of optical durability. For example, iodine-based polarizing plates are left under dry heat. Then, problems such as a decrease in transmittance and discoloration of the polarizing plate occur.
【０００３】特公昭 60-33245 号公報には、ヨウ素が吸
着配向されたポリビニルアルコールフィルムを、ヨウ化
カリウムとともに亜鉛イオンを含有するホウ酸水溶液で
処理する方法が開示されている。このように、ヨウ素染
色後に亜鉛を含むホウ酸水溶液で処理し、ヨウ素染色さ
れたポリビニルアルコール偏光子中に亜鉛を存在させる
方法は、乾熱下で放置した後の不具合を改善するという
面では効果を発揮するものの、ホウ酸処理浴中に塩化亜
鉛のような亜鉛塩を含有させる必要があり、濃度管理が
煩わしいなど、経済性の面では未だ改善の余地があっ
た。Japanese Patent Publication No. 60-33245 discloses a method of treating a polyvinyl alcohol film in which iodine is adsorbed and oriented with an aqueous boric acid solution containing zinc ions together with potassium iodide. Thus, the method of treating with an aqueous solution of boric acid containing zinc after dyeing with iodine and allowing zinc to be present in the polyvinyl alcohol polarizer dyed with iodine is effective in terms of improving defects after being left under dry heat. However, it is necessary to add a zinc salt such as zinc chloride to the boric acid treatment bath, and the concentration control is troublesome. Therefore, there is still room for improvement in terms of economic efficiency.
【０００４】[0004]
【発明が解決しようとする課題】そこで本発明者らは、
ホウ酸処理浴中に亜鉛塩を存在させる方法とは異なる方
法で、ヨウ素系偏光板の耐久性を高めるべく研究を行
い、本発明に到達した。したがって本発明の目的は、ホ
ウ酸処理浴中に亜鉛塩を存在させる必要がなく、耐久性
の改良されたヨウ素系偏光板を提供し、さらにはその製
造方法を提供することにある。Therefore, the present inventors have found that
The present invention has been accomplished by conducting research to enhance the durability of the iodine-based polarizing plate by a method different from the method in which the zinc salt is present in the boric acid treatment bath. Therefore, an object of the present invention is to provide an iodine-based polarizing plate having improved durability, which does not require the presence of a zinc salt in a boric acid treatment bath, and further to provide a method for producing the same.
【０００５】[0005]
【課題を解決するための手段】本発明者らは、かかる目
的のもとで研究を行った結果、亜鉛を特定量含有する接
着剤をヨウ素系偏光フィルムと保護フィルムとの貼合に
用いることにより、あるいは接着剤層中に亜鉛を存在さ
せ、偏光板全体に対する亜鉛の量を特定量とすることに
より、乾熱下における変色などの問題を抑える効果が得
られ、したがってホウ酸処理浴の濃度管理などの煩わし
さがなくなることを見出し、本発明に至った。Means for Solving the Problems The inventors of the present invention have conducted research on the above object, and as a result, have found that an adhesive containing a specific amount of zinc is used for laminating an iodine-based polarizing film and a protective film. By or by allowing zinc to exist in the adhesive layer and adjusting the amount of zinc to the entire polarizing plate to a specific amount, the effect of suppressing discoloration under dry heat can be obtained. The present invention has been accomplished by finding that the troublesomeness of management is eliminated.
【０００６】すなわち本発明によれば、ヨウ素が吸着配
向されたポリビニルアルコール系樹脂フィルムに、透明
な接着剤層を介して保護フィルムが貼合されてなる偏光
板であって、接着剤層が亜鉛を含有し、亜鉛の量が偏光
板１ｍ2 あたり３０〜９０mgであるヨウ素系偏光板が提
供される。また本発明によれば、ヨウ素が吸着配向され
たポリビニルアルコール系樹脂フィルムに、透明な接着
剤層を介して保護フィルムが貼合されてなる偏光板であ
って、接着剤層が亜鉛を６〜１８重量％含有する偏光板
も提供される。さらに本発明によれば、ヨウ素が吸着配
向されたポリビニルアルコール系樹脂フィルムに、接着
剤の全固形分量を基準に亜鉛を６〜１８重量％含有する
透明な接着剤を介して保護フィルムを貼合することによ
り、ヨウ素系偏光板を製造する方法も提供される。That is, according to the present invention, there is provided a polarizing plate comprising a polyvinyl alcohol-based resin film in which iodine is adsorbed and oriented, and a protective film is attached via a transparent adhesive layer, wherein the adhesive layer is zinc. An iodine-based polarizing plate containing 10 to 90 mg of zinc is contained in an amount of 30 to 90 mg per 1 m 2 of the polarizing plate. Further, according to the present invention, there is provided a polarizing plate comprising a polyvinyl alcohol-based resin film in which iodine is adsorbed and oriented, and a protective film bonded to the polyvinyl alcohol-based resin film via a transparent adhesive layer. A polarizing plate containing 18% by weight is also provided. Further, according to the present invention, a protective film is attached to a polyvinyl alcohol-based resin film in which iodine is adsorbed and oriented, via a transparent adhesive containing 6 to 18% by weight of zinc based on the total solid content of the adhesive. By doing so, a method for producing an iodine-based polarizing plate is also provided.
【０００７】[0007]
【発明の実施の形態】以下、本発明を詳細に説明する。
本発明に係る偏光板は、一軸延伸されたポリビニルアル
コール系樹脂フィルムにヨウ素が吸着配向された、いわ
ゆるヨウ素系偏光フィルムの少なくとも片面に、接着剤
層を介して保護フィルムが貼合されたものである。そし
て本発明では、この接着剤層に亜鉛を含有させる。一つ
の見地からは、この亜鉛の量は、偏光板１ｍ2 あたり３
０〜９０mgである。また別の見地からは、この亜鉛の量
は、接着剤層中６〜１８重量％である。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below.
The polarizing plate according to the present invention, in which iodine is adsorbed and oriented in a uniaxially stretched polyvinyl alcohol-based resin film, at least one surface of a so-called iodine-based polarizing film, a protective film is attached via an adhesive layer. is there. And in this invention, zinc is contained in this adhesive layer. From one viewpoint, the amount of this zinc is 3 per 1 m 2 of the polarizing plate.
It is 0 to 90 mg. From another perspective, the amount of zinc is 6-18% by weight in the adhesive layer.
【０００８】本発明の偏光フィルムを構成するポリビニ
ルアルコール系樹脂は通常、ポリ酢酸ビニル系樹脂をケ
ン化することにより得られる。ポリ酢酸ビニル系樹脂と
しては、酢酸ビニルの単独重合体であるポリ酢酸ビニル
のほか、酢酸ビニル及びこれと共重合可能な他の単量体
の共重合体などが例示される。酢酸ビニルに共重合され
る他の単量体としては、例えば、不飽和カルボン酸類、
オレフィン類、ビニルエーテル類、不飽和スルホン酸類
などが挙げられる。ポリビニルアルコール系樹脂のケン
化度は、通常８５〜１００モル％、好ましくは９８〜１
００モル％の範囲である。このポリビニルアルコール系
樹脂はさらに変性されていてもよく、例えば、アルデヒ
ド類で変性されたポリビニルホルマールやポリビニルア
セタールなども使用し得る。ポリビニルアルコール系樹
脂の重合度は、通常 １,０００〜１０,０００、好まし
くは１,５００〜１０,０００の範囲である。The polyvinyl alcohol resin constituting the polarizing film of the present invention is usually obtained by saponifying a polyvinyl acetate resin. Examples of the polyvinyl acetate-based resin include polyvinyl acetate, which is a homopolymer of vinyl acetate, and copolymers of vinyl acetate and other monomers copolymerizable therewith. Other monomers copolymerized with vinyl acetate, for example, unsaturated carboxylic acids,
Examples thereof include olefins, vinyl ethers and unsaturated sulfonic acids. The saponification degree of the polyvinyl alcohol resin is usually 85 to 100 mol%, preferably 98 to 1
It is in the range of 00 mol%. The polyvinyl alcohol-based resin may be further modified, and for example, polyvinyl formal or polyvinyl acetal modified with aldehydes may be used. The polymerization degree of the polyvinyl alcohol resin is usually in the range of 1,000 to 10,000, preferably 1,500 to 10,000.
【０００９】ヨウ素系偏光板は通常、このようなポリビ
ニルアルコール系樹脂フィルムを一軸延伸する工程、こ
のポリビニルアルコール系樹脂フィルムをヨウ素で染色
して当該ヨウ素を吸着させる工程、ヨウ素が吸着された
ポリビニルアルコール系樹脂フィルムをホウ酸水溶液で
処理する工程、このホウ酸水溶液による処理後に水洗す
る工程、及びこれらの工程が施されてヨウ素が吸着配向
された一軸延伸ポリビニルアルコール系樹脂フィルムの
少なくとも片面に保護フィルムを貼合する工程を経て、
製造される。一軸延伸は、ヨウ素染色の前に行ってもよ
いし、ヨウ素染色と同時に行ってもよいし、ヨウ素染色
の後に行ってもよい。一軸延伸をヨウ素染色後に行う場
合には、この一軸延伸は、ホウ酸処理の前に行ってもよ
いし、ホウ酸処理中に行ってもよい。またもちろん、こ
れらの複数の段階で一軸延伸を行うことも可能である。
一軸延伸するには、周速の異なるロール間で一軸に延伸
してもよいし、熱ロールを用いて一軸に延伸してもよ
い。また、大気中で延伸を行う乾式延伸であってもよい
し、溶剤で膨潤した状態で延伸を行う湿式延伸であって
もよい。延伸倍率は、通常４〜８倍程度である。The iodine type polarizing plate is usually a step of uniaxially stretching such a polyvinyl alcohol type resin film, a step of dyeing the polyvinyl alcohol type resin film with iodine to adsorb the iodine, and a polyvinyl alcohol having iodine adsorbed thereon. Step of treating the base resin film with a boric acid aqueous solution, a step of washing with water after the treatment with the boric acid aqueous solution, and a protective film on at least one surface of the uniaxially stretched polyvinyl alcohol-based resin film in which iodine is adsorbed and oriented by these steps. After the process of bonding
Manufactured. The uniaxial stretching may be performed before dyeing with iodine, simultaneously with dyeing with iodine, or after dyeing with iodine. When the uniaxial stretching is performed after dyeing with iodine, the uniaxial stretching may be performed before the boric acid treatment or during the boric acid treatment. Of course, it is also possible to carry out uniaxial stretching in these plural stages.
For uniaxial stretching, stretching may be uniaxial between rolls having different peripheral speeds, or uniaxial stretching may be performed using hot rolls. Further, it may be dry stretching in which stretching is performed in the atmosphere, or wet stretching in which the stretching is performed in a state of being swollen with a solvent. The draw ratio is usually about 4 to 8 times.
【００１０】ポリビニルアルコール系樹脂フィルムにヨ
ウ素を吸着配向させるためには、通常、ヨウ素及びヨウ
化カリウムを含有する水溶液に、このポリビニルアルコ
ール系樹脂フィルムを浸漬して染色する方法が採用され
る。この水溶液におけるヨウ素の含有量は通常、水１０
０重量部あたり０.０１〜０.５重量部程度であり、ヨウ
化カリウムの含有量は通常、水１００重量部あたり ０.
５〜１０重量部程度である。この水溶液の温度は、通常
２０〜４０℃程度であり、また、この水溶液への浸漬時
間は、通常３０〜３００秒程度である。In order to adsorb and orient iodine on the polyvinyl alcohol resin film, a method of immersing the polyvinyl alcohol resin film in an aqueous solution containing iodine and potassium iodide and dyeing is usually employed. The content of iodine in this aqueous solution is usually 10
It is about 0.01 to 0.5 parts by weight per 0 parts by weight, and the content of potassium iodide is usually 0.0 per 100 parts by weight of water.
It is about 5 to 10 parts by weight. The temperature of this aqueous solution is usually about 20 to 40 ° C., and the immersion time in this aqueous solution is usually about 30 to 300 seconds.
【００１１】ヨウ素染色後のホウ酸処理は、ヨウ素によ
り染色されたポリビニルアルコール系樹脂フィルムをホ
ウ酸水溶液に浸漬することにより行われる。ホウ酸水溶
液におけるホウ酸の含有量は通常、水１００重量部あた
り２〜１５重量部程度、好ましくは５〜１２重量部程度
である。またこのホウ酸水溶液は、ヨウ化カリウムを含
有するのが好ましい。ホウ酸水溶液への浸漬時間は、通
常 １００〜１,２００秒程度、好ましくは１５０〜６０
０秒程度、さらに好ましくは２００〜４００秒程度であ
る。The boric acid treatment after dyeing with iodine is carried out by immersing the polyvinyl alcohol resin film dyed with iodine in an aqueous boric acid solution. The content of boric acid in the boric acid aqueous solution is usually about 2 to 15 parts by weight, preferably about 5 to 12 parts by weight, per 100 parts by weight of water. Further, this boric acid aqueous solution preferably contains potassium iodide. The immersion time in the aqueous boric acid solution is usually about 100 to 1,200 seconds, preferably 150 to 60 seconds.
It is about 0 seconds, more preferably about 200 to 400 seconds.
【００１２】ホウ酸処理後のポリビニルアルコール系樹
脂フィルムは、通常、水洗処理される。水洗処理は、例
えば、ホウ酸処理されたポリビニルアルコール系樹脂フ
ィルムを水に浸漬することにより行われる。水洗後は乾
燥処理が施されて、ヨウ素が吸着配向されたポリビニル
アルコール系樹脂フィルム、すなわちヨウ素系偏光フィ
ルムが得られる。The polyvinyl alcohol resin film after the boric acid treatment is usually washed with water. The water washing treatment is performed, for example, by immersing the boric acid-treated polyvinyl alcohol-based resin film in water. After washing with water, a drying treatment is performed to obtain a polyvinyl alcohol-based resin film in which iodine is adsorbed and oriented, that is, an iodine-based polarizing film.
【００１３】かくして得られる偏光フィルムは、その片
面又は両面に保護フィルムを積層して、偏光板とされ
る。保護フィルムとしては、例えば、トリアセチルセル
ロースやジアセチルセルロースのようなセルロースアセ
テート樹脂フィルム、アクリル樹脂フィルム、ポリエス
テル樹脂フィルム、ポリアリレート樹脂フィルム、ポリ
エーテルサルホン樹脂フィルム、ポリノルボルネン樹脂
フィルムのような環状ポリオレフィン樹脂フィルムなど
が挙げられ、その厚みは、通常３０〜２００μm程度で
ある。The polarizing film thus obtained is laminated with a protective film on one side or both sides to form a polarizing plate. Examples of the protective film include cellulose acetate resin films such as triacetyl cellulose and diacetyl cellulose, acrylic resin films, polyester resin films, polyarylate resin films, polyether sulfone resin films, and cyclic polyolefins such as polynorbornene resin films. Examples of the resin film include a resin film, and the thickness thereof is usually about 30 to 200 μm.
【００１４】保護フィルムの積層には、透明で光学的に
等方性の接着剤が用いられる。そして本発明において
は、この接着剤中に亜鉛を含有させておき、得られる偏
光板の１ｍ2 あたり、３０〜９０mgの亜鉛が存在するよ
うにする。偏光フィルムの両面に接着剤層を介して保護
フィルムを貼合する場合、ここでいう偏光板１ｍ2 あた
りの亜鉛量は、もちろん両層に存在する合計量である。A transparent and optically isotropic adhesive is used for laminating the protective film. Then, in the present invention, zinc is contained in this adhesive so that 30 to 90 mg of zinc is present per 1 m 2 of the obtained polarizing plate. When the protective films are attached to both surfaces of the polarizing film via the adhesive layer, the amount of zinc per 1 m 2 of the polarizing plate is of course the total amount present in both layers.
【００１５】このように亜鉛を含有する接着剤層を介し
て保護フィルムが貼合された偏光板について、その断面
の亜鉛濃度分布を電子プローブＸ線マイクロアナライザ
ー（ＥＰＭＡ）で線分析すると、保護フィルム／ポリビ
ニルアルコール系樹脂フィルムの界面付近に亜鉛の存在
を示す出力ピークが現れる。その出力チャートから以下
の手法で計算される強度比が １.５以上、好ましくは２
以上となるようにすることで、偏光板の色相変化を抑え
ることができる。この強度比は、偏光板断面の亜鉛濃度
分布をＥＰＭＡ線分析したときに、保護フィルム部分の
出力強度をベースラインとして、最高出力強度（ａ）と
ポリビニルアルコール系樹脂フィルム断面内の最低出力
強度（ｂ）を求め、式ａ／ｂにより算出される。具体的
な計算方法の例を図１に基づいて説明すると、保護フィ
ルム／ポリビニルアルコール系樹脂フィルム／保護フィ
ルムの断面について、亜鉛をＥＰＭＡ線分析して得られ
るチャートにおいて、保護フィルム部分に相当する出力
強度の低い平坦部分をベースラインとして、最高出力強
度（ａ）を求め、またポリビニルアルコール系樹脂フィ
ルム断面内の最低出力強度（ｂ）を求める。そして、ａ
／ｂにより、上記の強度比が算出される。このＥＰＭＡ
線分析にあたっては、ビーム径を１μmφとする。When the protective film is laminated with the zinc-containing adhesive layer as described above, the zinc concentration distribution in the cross section of the polarizing plate is analyzed by an electron probe X-ray microanalyzer (EPMA). / An output peak indicating the presence of zinc appears near the interface of the polyvinyl alcohol resin film. The intensity ratio calculated by the following method from the output chart is 1.5 or more, preferably 2
By setting it as above, the hue change of the polarizing plate can be suppressed. This intensity ratio is the maximum output intensity (a) and the minimum output intensity in the polyvinyl alcohol-based resin film cross section (a) when the zinc concentration distribution in the cross section of the polarizing plate is analyzed by EPMA line with the output intensity of the protective film part as the baseline. b) is obtained and calculated by the equation a / b. An example of a specific calculation method will be described with reference to FIG. 1. In the chart obtained by EPMA line analysis of zinc for the cross section of protective film / polyvinyl alcohol resin film / protective film, the output corresponding to the protective film part The maximum output strength (a) is determined with the flat portion having low strength as the baseline, and the minimum output strength (b) in the cross section of the polyvinyl alcohol-based resin film is determined. And a
The intensity ratio is calculated from / b. This EPMA
In the line analysis, the beam diameter is 1 μmφ.
【００１６】接着剤中に含有される亜鉛の量は、接着剤
中の全固形分量を基準に、６〜１８重量％とするのが適
当である。亜鉛の量がこれより少ないと、乾熱下での色
相変化を防止する効果が弱くなり、またこれより多い
と、接着剤層が脆くなり、偏光フィルムと保護フィルム
の剥離が起こる場合がある。The amount of zinc contained in the adhesive is preferably 6 to 18% by weight, based on the total solid content in the adhesive. When the amount of zinc is less than the above range, the effect of preventing hue change under dry heat becomes weak, and when the amount of zinc is more than that range, the adhesive layer becomes brittle and peeling between the polarizing film and the protective film may occur.
【００１７】透明な接着剤としては、例えば、ポリビニ
ルアルコール系接着剤、アクリル系接着剤、ウレタン系
接着剤などが挙げられるが、必ずしもこれらに限定され
るものではない。これらのなかでも好ましいポリビニル
アルコール系接着剤は、部分ケン化ポリビニルアルコー
ルや完全ケン化ポリビニルアルコールのほか、アセトア
セチル基変性ポリビニルアルコール、カルボキシル基変
性ポリビニルアルコールのような、変性されたポリビニ
ルアルコール系樹脂水溶液でありうる。また、水溶性エ
ポキシ化合物、ジアルデヒド、イソシアネートなどの架
橋剤を含有していてもよい。接着剤は、エマルジョンタ
イプでもよい。接着剤の溶剤としては水が好ましいが、
若干量の親水性有機溶媒、例えばアルコール類などが含
まれていてもよい。Examples of the transparent adhesive include, but are not limited to, polyvinyl alcohol adhesive, acrylic adhesive, urethane adhesive and the like. Among these, preferred polyvinyl alcohol-based adhesives are partially saponified polyvinyl alcohol and fully saponified polyvinyl alcohol, as well as modified polyvinyl alcohol-based resin aqueous solutions such as acetoacetyl group-modified polyvinyl alcohol and carboxyl group-modified polyvinyl alcohol. Can be Further, it may contain a crosslinking agent such as a water-soluble epoxy compound, dialdehyde or isocyanate. The adhesive may be an emulsion type. Water is preferred as the solvent for the adhesive,
A slight amount of hydrophilic organic solvent such as alcohol may be contained.
【００１８】接着剤中に亜鉛を含有させるには、亜鉛の
水溶性塩を接着剤に添加し、亜鉛含有接着剤を調製する
方法が最も簡単である。水溶性の亜鉛塩としては、塩化
亜鉛のようなハロゲン化亜鉛や、硫酸亜鉛、硝酸亜鉛な
どの各種無機塩類が挙げられるが、塩化亜鉛が最も好ま
しい。また、亜鉛の錯化合物の塩や亜鉛の錯化合物溶液
を接着剤に添加してもよい。The easiest way to add zinc to the adhesive is to add a water-soluble salt of zinc to the adhesive to prepare a zinc-containing adhesive. Examples of the water-soluble zinc salt include zinc halides such as zinc chloride and various inorganic salts such as zinc sulfate and zinc nitrate, with zinc chloride being most preferred. Further, a salt of a complex compound of zinc or a solution of a complex compound of zinc may be added to the adhesive.
【００１９】通常、接着剤を介して偏光フィルムと保護
フィルムを貼合した後は、溶剤を除去するために乾燥し
て、偏光板とされる。乾燥は通常、熱風乾燥により行わ
れるが、そのときの温度は４０〜１００℃程度、好まし
くは４５〜９０℃の範囲から適宜選択される。乾燥時間
は、通常 ２０〜１,２００秒程度である。乾燥後の接着
剤層の厚みは、通常０.０１〜４μm 程度、好ましくは
０.０５〜２μm 程度であるが、必ずしもこれに限定さ
れるものではない。Usually, after the polarizing film and the protective film are bonded together via an adhesive, they are dried to remove the solvent to obtain a polarizing plate. Drying is usually performed by hot air drying, and the temperature at that time is appropriately selected from the range of about 40 to 100 ° C, preferably 45 to 90 ° C. The drying time is usually about 20 to 1,200 seconds. The thickness of the adhesive layer after drying is usually about 0.01 to 4 μm, preferably about 0.05 to 2 μm, but the thickness is not necessarily limited to this.
【００２０】本発明の偏光板においては、接着剤層中に
亜鉛を存在させることが必須であるが、他の層に亜鉛が
存在することを排除するものではなく、例えば、ポリビ
ニルアルコール系樹脂からなる偏光子中にも少量の亜鉛
を存在させ、それと保護フィルムとを亜鉛入りの接着剤
を介して貼合する形態も包含される。ただ、ヨウ素染色
後に用いるホウ酸処理浴の濃度管理の煩わしさなども考
慮すれば、偏光板中に存在する亜鉛は、その全量が接着
剤中に含まれる亜鉛に由来するようにするのが有利であ
る。In the polarizing plate of the present invention, the presence of zinc in the adhesive layer is essential, but the presence of zinc in other layers is not excluded. For example, polyvinyl alcohol resin is used. It also includes a mode in which a small amount of zinc is present also in the polarizer and the protective film is bonded to the polarizer via an adhesive containing zinc. However, considering the complexity of the concentration control of the boric acid treatment bath used after iodine dyeing, it is advantageous that the total amount of zinc present in the polarizing plate is derived from zinc contained in the adhesive. Is.
【００２１】かくして得られる偏光板は、その表面にハ
ードコート層、反射防止層、防眩層などを有していても
よい。また通常は、上記偏光板の少なくとも片面に粘着
剤層が設けられている。The polarizing plate thus obtained may have a hard coat layer, an antireflection layer, an antiglare layer or the like on its surface. Further, usually, a pressure-sensitive adhesive layer is provided on at least one surface of the polarizing plate.
【００２２】[0022]
【実施例】以下、実施例により本発明をさらに詳細に説
明するが、本発明はこれらによって限定されるものでは
ない。例中、含有量ないし使用量を表す％は、特記ない
かぎり重量基準である。また、偏光板断面の亜鉛のＥＰ
ＭＡ線分析は、（株）島津製作所製の電子プローブＸ線
マイクロアナライザー“EPM-810 ”を用いて、以下の測
定条件で行った。The present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto. In the examples,% representing content or amount used is based on weight unless otherwise specified. In addition, the zinc EP of the cross section of the polarizing plate
The MA ray analysis was performed under the following measurement conditions using an electronic probe X-ray microanalyzer "EPM-810" manufactured by Shimadzu Corporation.
【００２３】〔ＥＰＭＡ線分析の条件〕 加速電圧：１５kV、 試料吸収電流：０.０５μA、 ビーム径：１μmφ、 試料移動：３μm／分、 チャート送り速度：１cm／分、 走査距離：１００μm、 分光結晶：Ｋα２−PET。[Conditions for EPMA Line Analysis] Accelerating voltage: 15kV, Sample absorption current: 0.05 μA, Beam diameter: 1μmφ, Sample movement: 3 μm / min, Chart feed rate: 1 cm / min, Scanning distance: 100 μm, Spectroscopic crystal: Kα2-PET.
【００２４】実施例１
平均重合度約２,４００、ケン化度９９.９モル％以上で
厚さ７５μm のポリビニルアルコールフィルムを乾式で
延伸倍率５倍に一軸延伸し、さらに緊張状態を保ったま
ま、ヨウ素／ヨウ化カリウム／水の重量比が０.０５／
５／１００ の水溶液に２８℃で６０秒間浸漬した。次
に、ヨウ化カリウム／ホウ酸／水が重量比で１０／９.
５／１００ の水溶液に７４℃で３００秒間浸漬した。
２６℃の純水で２０秒間水洗した後、６５℃で乾燥し
て、ポリビニルアルコール系偏光フィルムを得た。偏光
フィルムの厚みは、約２６μm であった。Example 1 A polyvinyl alcohol film having an average degree of polymerization of about 2,400 and a degree of saponification of not less than 99.9 mol% and a thickness of 75 μm was uniaxially stretched at a stretching ratio of 5 times by a dry method, and the tension state was maintained. , Iodine / potassium iodide / water weight ratio of 0.05 /
It was immersed in a 5/100 aqueous solution at 28 ° C. for 60 seconds. Next, potassium iodide / boric acid / water in a weight ratio of 10/9.
It was immersed in a 5/100 aqueous solution at 74 ° C. for 300 seconds.
It was washed with pure water at 26 ° C for 20 seconds and then dried at 65 ° C to obtain a polyvinyl alcohol-based polarizing film. The polarizing film had a thickness of about 26 μm.
【００２５】一方、平均重合度約１,７００、ケン化度
９９.６モル％以上のポリビニルアルコール水溶液に塩
化亜鉛を加えて、ポリビニルアルコール／水／塩化亜鉛
の重量比が４／１００／１.５ の接着剤とした。この接
着剤の全固形分に対する亜鉛の含有量は約１３％であ
る。先に得られた偏光フィルムの両面にこの接着剤を塗
布した後、それぞれの面に、表面ケン化処理が施された
トリアセチルセルロースからなる厚さ８０μm の保護フ
ィルム（“フジタック T80UZ”、富士写真フィルム
（株）から入手）を貼合した。そして、７０℃で４分間
乾燥して偏光板を得た。On the other hand, zinc chloride is added to an aqueous polyvinyl alcohol solution having an average degree of polymerization of about 1,700 and a saponification degree of 99.6 mol% or more, so that the weight ratio of polyvinyl alcohol / water / zinc chloride is 4/100/1. Adhesive No. 5 was used. The zinc content of this adhesive is approximately 13% based on the total solids. After applying this adhesive on both sides of the polarizing film obtained above, a protective film ("Fujitac T80UZ", Fuji Photo, made of surface-saponified triacetylcellulose, with a thickness of 80 μm on each side. (Obtained from Film Co., Ltd.) was attached. Then, it was dried at 70 ° C. for 4 minutes to obtain a polarizing plate.
【００２６】得られた偏光板は、硫酸分解、灰化及び硝
酸溶解の順に前処理を行った後、フレーム原子吸光法で
分析したところ、その面積１ｍ2 あたり６８mgの亜鉛を
含有していた。偏光板中の接着剤層の厚みは、膜厚計を
用いては実測不可能であったが、接着剤中の亜鉛量（約
１３重量％）から推定すると、接着剤層の厚みはポリビ
ニルアルコールフィルムの片側でおよそ０.２μmであっ
た。この偏光板の断面について、前記の方法で亜鉛のＥ
ＰＭＡ線分析したときの強度比を表１に示す。さらに、
この偏光板２枚を８０℃の乾燥雰囲気に５００時間放置
した後、２枚の偏光板をその吸収軸が直交するように重
ね、蛍光灯を用いたライトボックス上で透過色を観察し
た。結果を併せて表１に示す。The obtained polarizing plate was subjected to pretreatments in the order of sulfuric acid decomposition, ashing and nitric acid dissolution, and then analyzed by flame atomic absorption spectroscopy. As a result, it was found that 68 mg of zinc was contained per 1 m 2 of the area. The thickness of the adhesive layer in the polarizing plate could not be measured using a film thickness meter, but when estimated from the amount of zinc (about 13% by weight) in the adhesive, the thickness of the adhesive layer was polyvinyl alcohol. It was approximately 0.2 μm on one side of the film. Regarding the cross section of this polarizing plate, zinc E
Table 1 shows the intensity ratio of the PMA line analysis. further,
After leaving the two polarizing plates in a dry atmosphere at 80 ° C. for 500 hours, the two polarizing plates were stacked so that their absorption axes were orthogonal to each other, and the transmitted color was observed on a light box using a fluorescent lamp. The results are also shown in Table 1.
【００２７】実施例２
接着剤の組成をポリビニルアルコール／水／塩化亜鉛の
重量比で４／１００／２とし、したがってその中の全固
形分に対する亜鉛の含有量を約１６％とした以外は、実
施例１と同様にして偏光板を作製した。得られた偏光板
中の亜鉛量、断面のＥＰＭＡ線分析結果及び偏光板の評
価結果を表１に示す。Example 2 Except that the composition of the adhesive was 4/100/2 by weight ratio of polyvinyl alcohol / water / zinc chloride, and therefore the content of zinc was about 16% based on the total solid content in the adhesive. A polarizing plate was produced in the same manner as in Example 1. Table 1 shows the amount of zinc in the obtained polarizing plate, the EPMA line analysis result of the cross section, and the evaluation result of the polarizing plate.
【００２８】比較例１
塩化亜鉛を用いない以外は実施例１と同様にして偏光板
を作製した。評価結果を表１に示す。Comparative Example 1 A polarizing plate was prepared in the same manner as in Example 1 except that zinc chloride was not used. The evaluation results are shown in Table 1.
【００２９】比較例２
接着剤中の全固形分に対する亜鉛の含有量を約５％とし
た以外は、実施例１と同様にして偏光板を作製した。得
られた偏光板中の亜鉛量、断面のＥＰＭＡ線分析結果及
び偏光板の評価結果を表１に示す。Comparative Example 2 A polarizing plate was produced in the same manner as in Example 1 except that the content of zinc was about 5% based on the total solid content in the adhesive. Table 1 shows the amount of zinc in the obtained polarizing plate, the EPMA line analysis result of the cross section, and the evaluation result of the polarizing plate.
【００３０】[0030]
【表１】 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 例 No. 接着剤中 偏光板１m2 亜鉛の 乾熱試験前 80℃×500時間後 の亜鉛量 中の亜鉛量 強度比 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 実施例１ 13 % 68 mg 2.5 帯青味黒色 依然として帯青味色 〃 ２ 16 % 83 mg 2.9 〃 〃 ─────────────────────────────────── 比較例１ − − − 〃 赤く変色 〃 ２ 5 % 26 mg 1.4 〃 〃 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━[Table 1] ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Example No. In the adhesive Polarizing plate 1 m 2 Zinc Before the dry heat test of 80 ℃ × 500 hours after the zinc content in the zinc content in strength ratio ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ ━━━━━ Example 1 13% 68 mg 2.5 bluish black still bluish 〃 2 16% 83 mg 2.9 〃 〃 ──────────────────── ──────────────── Comparative Example 1 − − − 〃 Discoloration 〃 25% 26 mg 1.4 〃 〃 ━━━━━━━━━━━━━━━━━ ━━━━━━━━━━━━━━━━━━━
【００３１】[0031]
【発明の効果】本発明のヨウ素系偏光板は、乾熱下に置
いた後の劣化が防止され、耐久性に優れたものとなる。
そして、かかるヨウ素系偏光板における耐久性の向上
が、従来知られている方法よりも簡便な方法で達成でき
る。EFFECT OF THE INVENTION The iodine type polarizing plate of the present invention is prevented from deterioration after being placed under dry heat and has excellent durability.
Then, the improvement of the durability of the iodine-based polarizing plate can be achieved by a simpler method than conventionally known methods.
【図１】偏光板断面の亜鉛濃度分布を電子プローブＸ線
マイクロアナライザーで線分析したときの、最高出力強
度と最低出力強度を説明するための出力チャートの例で
ある。FIG. 1 is an example of an output chart for explaining the maximum output intensity and the minimum output intensity when a zinc concentration distribution in a cross section of a polarizing plate is subjected to line analysis with an electron probe X-ray microanalyzer.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 林 成年 新居浜市惣開町５番１号 住友化学工業株 式会社内 (72)発明者 植田 智生 丸亀市中津町1515番地 オー・エル・エス 有限会社内 Ｆターム(参考） 2H049 BA02 BA25 BA27 BB11 BB23 BB28 BB33 BB43 BB51 BC03 BC14 BC22 4J040 DD021 HA066 KA03 MA10 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Hayashi 5-1 Sokai-cho, Niihama Sumitomo Chemical Co., Ltd. Inside the company (72) Inventor Tomoo Ueda 1515 Nakatsu-cho, Marugame City OLS Limited company F-term (reference) 2H049 BA02 BA25 BA27 BB11 BB23 BB28 BB33 BB43 BB51 BC03 BC14 BC22 4J040 DD021 HA066 KA03 MA10
Claims (7)
ール系樹脂フィルムに、透明な接着剤層を介して保護フ
ィルムが貼合されてなる偏光板であって、該接着剤層が
亜鉛を含有し、亜鉛の量が偏光板１ｍ2 あたり３０〜９
０mgであることを特徴とするヨウ素系偏光板。1. A polarizing plate comprising a polyvinyl alcohol-based resin film in which iodine is adsorbed and oriented, and a protective film attached via a transparent adhesive layer, the adhesive layer containing zinc. The amount of zinc is 30 to 9 per 1 m 2 of the polarizing plate.
An iodine-based polarizing plate characterized by being 0 mg.
ール系樹脂フィルムに、透明な接着剤層を介して保護フ
ィルムが貼合されてなる偏光板であって、該接着剤層が
亜鉛を６〜１８重量％含有することを特徴とするヨウ素
系偏光板。2. A polarizing plate comprising a polyvinyl alcohol-based resin film in which iodine is adsorbed and oriented, and a protective film attached to the polyvinyl alcohol-based resin film via a transparent adhesive layer, wherein the adhesive layer contains zinc in an amount of 6-18. An iodine-based polarizing plate, characterized in that the iodine-based polarizing plate is contained by weight%.
クロアナライザーで線分析したときに、最高出力強度と
偏光板断面のポリビニルアルコール系樹脂フィルム位置
にある最低出力強度の比が１.５以上である請求項１又
は２に記載の偏光板。3. A ratio of the maximum output intensity to the minimum output intensity at the position of the polyvinyl alcohol-based resin film in the polarizing plate cross section is 1.5 or more when the zinc in the polarizing plate cross section is subjected to line analysis with an electron probe X-ray microanalyzer. The polarizing plate according to claim 1 or 2.
ール系樹脂フィルムの両面に保護フィルムが貼合されて
いる請求項１〜３のいずれかに記載の偏光板。4. The polarizing plate according to claim 1, wherein protective films are attached to both surfaces of a polyvinyl alcohol-based resin film in which iodine is adsorbed and oriented.
ある請求項１〜４のいずれかに記載の偏光板。5. The polarizing plate according to claim 1, wherein the adhesive is a polyvinyl alcohol-based adhesive.
る亜鉛に由来する請求項１〜５のいずれかに記載の偏光
板。6. The polarizing plate according to claim 1, wherein the total amount of zinc in the polarizing plate is derived from zinc contained in the adhesive.
ール系樹脂フィルムに、接着剤の全固形分量を基準に亜
鉛を６〜１８重量％含有する透明な接着剤を介して、保
護フィルムを貼合することを特徴とするヨウ素系偏光板
の製造方法。7. A protective film is attached to a polyvinyl alcohol-based resin film in which iodine is adsorbed and oriented, via a transparent adhesive containing 6 to 18% by weight of zinc based on the total solid content of the adhesive. A method for producing an iodine-based polarizing plate, comprising:
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100914876B1 (en) * | 2001-05-10 | 2009-08-31 | 스미또모 가가꾸 가부시끼가이샤 | Polarizing plate and method for producing the same |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102237396B1 (en) | 2013-04-11 | 2021-04-07 | 스미또모 가가꾸 가부시키가이샤 | Alignment layer for optically anisotropic film |
| KR102329698B1 (en) | 2013-08-09 | 2021-11-23 | 스미또모 가가꾸 가부시키가이샤 | Process for producing long circularly polarizing plate and long circularly polarizing plate |
| JP2015129920A (en) | 2013-12-05 | 2015-07-16 | 住友化学株式会社 | Optical anisotropic film manufacturing method |
| US9625629B2 (en) | 2013-12-05 | 2017-04-18 | Sumitomo Chemical Company, Limited | Process for producing optically anisotropic film |
| JP2015138162A (en) | 2014-01-23 | 2015-07-30 | 住友化学株式会社 | Optical anisotropic film |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100914876B1 (en) * | 2001-05-10 | 2009-08-31 | 스미또모 가가꾸 가부시끼가이샤 | Polarizing plate and method for producing the same |
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