JP5402941B2 - 偏光板及びそれを用いた液晶表示装置 - Google Patents
偏光板及びそれを用いた液晶表示装置 Download PDFInfo
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- JP5402941B2 JP5402941B2 JP2010541281A JP2010541281A JP5402941B2 JP 5402941 B2 JP5402941 B2 JP 5402941B2 JP 2010541281 A JP2010541281 A JP 2010541281A JP 2010541281 A JP2010541281 A JP 2010541281A JP 5402941 B2 JP5402941 B2 JP 5402941B2
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- optical film
- polarizing plate
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- resin
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- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 1
- 239000000391 magnesium silicate Substances 0.000 description 1
- 229910052919 magnesium silicate Inorganic materials 0.000 description 1
- 235000019792 magnesium silicate Nutrition 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000113 methacrylic resin Substances 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013008 moisture curing Methods 0.000 description 1
- PSHKMPUSSFXUIA-UHFFFAOYSA-N n,n-dimethylpyridin-2-amine Chemical compound CN(C)C1=CC=CC=N1 PSHKMPUSSFXUIA-UHFFFAOYSA-N 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- MCSAJNNLRCFZED-UHFFFAOYSA-N nitroethane Chemical compound CC[N+]([O-])=O MCSAJNNLRCFZED-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- SSDSCDGVMJFTEQ-UHFFFAOYSA-N octadecyl 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 SSDSCDGVMJFTEQ-UHFFFAOYSA-N 0.000 description 1
- ZMHZSHHZIKJFIR-UHFFFAOYSA-N octyltin Chemical compound CCCCCCCC[Sn] ZMHZSHHZIKJFIR-UHFFFAOYSA-N 0.000 description 1
- 229920002601 oligoester Polymers 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 150000002902 organometallic compounds Chemical class 0.000 description 1
- PVADDRMAFCOOPC-UHFFFAOYSA-N oxogermanium Chemical compound [Ge]=O PVADDRMAFCOOPC-UHFFFAOYSA-N 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 150000003018 phosphorus compounds Chemical class 0.000 description 1
- XNGIFLGASWRNHJ-UHFFFAOYSA-L phthalate(2-) Chemical compound [O-]C(=O)C1=CC=CC=C1C([O-])=O XNGIFLGASWRNHJ-UHFFFAOYSA-L 0.000 description 1
- LFSXCDWNBUNEEM-UHFFFAOYSA-N phthalazine Chemical compound C1=NN=CC2=CC=CC=C21 LFSXCDWNBUNEEM-UHFFFAOYSA-N 0.000 description 1
- IEQIEDJGQAUEQZ-UHFFFAOYSA-N phthalocyanine Chemical compound N1C(N=C2C3=CC=CC=C3C(N=C3C4=CC=CC=C4C(=N4)N3)=N2)=C(C=CC=C2)C2=C1N=C1C2=CC=CC=C2C4=N1 IEQIEDJGQAUEQZ-UHFFFAOYSA-N 0.000 description 1
- 125000001557 phthalyl group Chemical group C(=O)(O)C1=C(C(=O)*)C=CC=C1 0.000 description 1
- 238000009832 plasma treatment Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 239000002685 polymerization catalyst Substances 0.000 description 1
- 239000003505 polymerization initiator Substances 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 229920005990 polystyrene resin Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 1
- 239000011164 primary particle Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- PNXMTCDJUBJHQJ-UHFFFAOYSA-N propyl prop-2-enoate Chemical compound CCCOC(=O)C=C PNXMTCDJUBJHQJ-UHFFFAOYSA-N 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000002516 radical scavenger Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000002040 relaxant effect Effects 0.000 description 1
- 239000011342 resin composition Substances 0.000 description 1
- 238000007363 ring formation reaction Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 229910021647 smectite Inorganic materials 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 238000000935 solvent evaporation Methods 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000011550 stock solution Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000012916 structural analysis Methods 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 150000003464 sulfur compounds Chemical class 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 239000011135 tin Substances 0.000 description 1
- KSBAEPSJVUENNK-UHFFFAOYSA-L tin(ii) 2-ethylhexanoate Chemical compound [Sn+2].CCCCC(CC)C([O-])=O.CCCCC(CC)C([O-])=O KSBAEPSJVUENNK-UHFFFAOYSA-L 0.000 description 1
- HPGGPRDJHPYFRM-UHFFFAOYSA-J tin(iv) chloride Chemical compound Cl[Sn](Cl)(Cl)Cl HPGGPRDJHPYFRM-UHFFFAOYSA-J 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 150000003918 triazines Chemical class 0.000 description 1
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000010456 wollastonite Substances 0.000 description 1
- 229910052882 wollastonite Inorganic materials 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 239000011592 zinc chloride Substances 0.000 description 1
- 235000005074 zinc chloride Nutrition 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
- PAPBSGBWRJIAAV-UHFFFAOYSA-N ε-Caprolactone Chemical compound O=C1CCCCCO1 PAPBSGBWRJIAAV-UHFFFAOYSA-N 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B3/00—Preparation of cellulose esters of organic acids
- C08B3/16—Preparation of mixed organic cellulose esters, e.g. cellulose aceto-formate or cellulose aceto-propionate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
- C08L1/08—Cellulose derivatives
- C08L1/10—Esters of organic acids, i.e. acylates
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
- C08L1/08—Cellulose derivatives
- C08L1/10—Esters of organic acids, i.e. acylates
- C08L1/12—Cellulose acetate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
- C08L1/08—Cellulose derivatives
- C08L1/10—Esters of organic acids, i.e. acylates
- C08L1/14—Mixed esters, e.g. cellulose acetate-butyrate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/04—Homopolymers or copolymers of esters
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/04—Homopolymers or copolymers of esters
- C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
- C08L33/08—Homopolymers or copolymers of acrylic acid esters
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/04—Homopolymers or copolymers of esters
- C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
- C08L33/10—Homopolymers or copolymers of methacrylic acid esters
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/04—Homopolymers or copolymers of esters
- C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
- C08L33/10—Homopolymers or copolymers of methacrylic acid esters
- C08L33/12—Homopolymers or copolymers of methyl methacrylate
Landscapes
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- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Physics & Mathematics (AREA)
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Polarising Elements (AREA)
- Treatments Of Macromolecular Shaped Articles (AREA)
Description
本願において、「光学フィルム」とは、液晶ディスプレイ、プラズマディスプレイ、有機ELディスプレイ等の各種表示装置に用いられる機能フィルムのことであり、詳しくは液晶表示装置用の偏光板保護フィルム、位相差フィルム、反射防止フィルム、輝度向上フィルム、ハードコートフィルム、防眩フィルム、帯電防止フィルム、視野角拡大等の光学補償フィルム等を含む。
本発明に用いられるアクリル樹脂には、メタクリル樹脂も含まれる。樹脂としては特に制限されるものではないが、メチルメタクリレート単位50〜99質量%、およびこれと共重合可能な他の単量体単位1〜50質量%からなるものである。
カラム: Shodex K806、K805、K803G(昭和電工(株)製を3本接続して使用した)
カラム温度:25℃
試料濃度: 0.1質量%
検出器: RI Model 504(GLサイエンス社製)
ポンプ: L6000(日立製作所(株)製)
流量: 1.0ml/min
校正曲線: 標準ポリスチレンSTK standard ポリスチレン(東ソー(株)製)Mw=100〜2,800,000迄の16サンプルによる校正曲線を使用した。16サンプルは、ほぼ等間隔に用いることが好ましい。
本発明に用いられるセルロースエステル樹脂としては、従来公知の種々の構造のセルロースエステル樹脂脂を用いることができる。例えば、脂肪族のアシル基、芳香族のアシル基のいずれで置換されていても良い。
本発明においては、特に、下記一般式(1)または(2)で表される繰り返し単位構造を有するセルロースエステル樹脂であることが必要である。
以下にAの具体例を挙げる。
A−1 −CH2CH2−
A−2 −CH2CH2CH2CH2CH2−
A−3 −CH=CH−
以下Bの具体例を挙げる。
B−1 −CH2CH2−
B−2 −CH2CH2CH2CH2−
本発明に係る光学フィルムにおいて、アクリル樹脂(A)とセルロースエステル樹脂(B)は、本発明の効果発現、耐湿性等の観点から、95:5〜30:70の質量比で含有されるが、好ましくは、90:10〜60:40である。
本発明に係る光学フィルムには、アクリル樹脂(A)、および一般式(1)または(2)で表される繰り返し単位を有するセルロースエステル樹脂(B)以外の樹脂を含有させてもよい。
本発明に係る光学フィルムには、フィルムに加工性を付与する可塑剤、フィルムの劣化を防止する酸化防止剤、紫外線吸収機能を付与する紫外線吸収剤、フィルムに滑り性を付与する微粒子(マット剤)等の添加剤を含有させることが好ましい。
可塑剤としては、フタル酸エステル系、脂肪酸エステル系、トリメリット酸エステル系、リン酸エステル系、ポリエステル系、あるいはエポキシ系等が挙げられる。
本発明では、酸化防止剤としては、通常知られているものを使用することができる。
本発明においては、着色剤を使用することが好ましい。着色剤と言うのは染料や顔料を意味するが、本発明では、液晶画面の色調を青色調にする効果またはイエローインデックスの調整、ヘイズの低減を有するものを指す。
本発明に用いられる紫外線吸収剤は特に限定されないが、例えばオキシベンゾフェノン系化合物、ベンゾトリアゾール系化合物、サリチル酸エステル系化合物、ベンゾフェノン系化合物、シアノアクリレート系化合物、トリアジン系化合物、ニッケル錯塩系化合物、無機粉体等が挙げられる。高分子型の紫外線吸収剤としてもよい。
本発明では、フィルムの滑り性を付与するためにマット剤を添加することが好ましい。
本発明に係る光学フィルムは、アクリル粒子(C)を含有することができる。
本発明においては、脆性の指標としては、「延性破壊が起こらない光学フィルム」であるかどうかという基準により判断することができる。延性破壊が起こらない、脆性が改善された光学フィルムを得ることで、大型の液晶表示装置用の偏光板を作製する際にも、製造時の破断や割れが発生せず、取扱い性に優れた光学フィルムとすることができる。
このような大きな応力が加えられても延性破壊が起こらない光学フィルムであれば、大型化された液晶表示装置用の偏光板保護フィルムとして用いられた場合であっても製造時の破断等の問題を十分に低減することが可能となり、さらに、一度貼り合わされた後に再度引き剥がして光学フィルムを使用する場合においても、破断が発生せず、光学フィルムの薄型化へも十分に対応可能である。
光学フィルムの製造方法の例を説明するが、本発明はこれに限定されるものではない。
本発明に係る光学フィルムを溶液流延法で製造する場合のドープを形成するのに有用な有機溶媒は、アクリル樹脂(A)、セルロースエステル樹脂(B)およびその他の添加剤を同時に溶解するものであれば制限なく用いることができる。
アクリル樹脂(A)、セルロースエステル樹脂(B)に対する良溶媒を主とする有機溶媒に、溶解釜中で該アクリル樹脂(A)、セルロースエステル樹脂(B)その他の添加剤を攪拌しながら溶解しドープを形成する工程、あるいは該アクリル樹脂(A)、セルロースエステル樹脂(B)、その他の添加剤溶液を混合して主溶解液であるドープを形成する工程である。
ドープを、送液ポンプ(例えば、加圧型定量ギヤポンプ)を通して加圧ダイに送液し、無限に移送する無端の金属ベルト、例えばステンレスベルト、あるいは回転する金属ドラム等の金属支持体上の流延位置に、加圧ダイスリットからドープを流延する工程である。
ウェブ(流延用支持体上にドープを流延し、形成されたドープ膜をウェブと呼ぶ)を流延用支持体上で加熱し、溶媒を蒸発させる工程である。
金属支持体上で溶媒が蒸発したウェブを、剥離位置で剥離する工程である。剥離されたウェブは次工程に送られる。
なお、残留溶媒量を測定する際の加熱処理とは、115℃で1時間の加熱処理を行うことを表す。
剥離後、ウェブを乾燥装置内に複数配置したロールに交互に通して搬送する乾燥装置35、および/またはクリップでウェブの両端をクリップして搬送するテンター延伸装置34を用いて、ウェブを乾燥する。
・幅手方向に延伸−幅手方向に延伸−流延方向に延伸−流延方向に延伸
また、同時2軸延伸には、一方向に延伸し、もう一方を、張力を緩和して収縮させる場合も含まれる。同時2軸延伸の好ましい延伸倍率は幅手方向、長手方向ともに×1.01倍〜×1.5倍の範囲でとることができる。
ウェブ中の残留溶媒量が2質量%以下となってから光学フィルムとして巻き取り機37により巻き取る工程であり、残留溶媒量を0.4質量%以下にすることにより寸法安定性の良好なフィルムを得ることができる。特に0.00〜0.10質量%で巻き取ることが好ましい。
本願でいう「鹸化処理」とは、光学フィルムのエステル構造部分を元の構成要素である酸とアルコールに分解するため、アルカリを加えて酸の塩とアルコールに分解する化学処理をいう。本発明においては、従来公知の種々の鹸化処理法を採用できるが、下記の方法に準拠した方法であることが好ましい。
アルカリ液の中に光学フィルムを適切な条件で浸漬して、フィルム全表面のアルカリと反応性を有する全ての面を鹸化処理する手法であり、特別な設備を必要としないため、コストの観点で好ましい。アルカリ液は、水酸化カリウム水溶液、水酸化ナトリウム水溶液などが好ましい。好ましい濃度は0.5〜3mol/Lであり、特に好ましくは1〜2mol/Lである。好ましいアルカリ液の液温は30〜75℃、特に好ましくは40〜70℃である。また好ましい浸漬時間は、30秒〜300秒、特に好ましくは60秒〜120秒である。
上述の浸漬法における各膜へのダメージを回避する手段として、適切な条件でアルカリ液を防眩層や低屈折率層等の機能層を有する表面と反対側の表面のみに塗布、加熱、水洗、乾燥するアルカリ液塗布法が好ましい。
本発明の偏光板は、アクリル樹脂(A)とセルロースエステル樹脂(B)とを含有する
光学フィルム用いた偏光板であって、当該光学フィルムが、分子内にメチルメタクリレート単位構造を50〜99質量%の範囲内で有し、重量平均分子量Mwが13万〜48万であるアクリル樹脂(A)と、前記一般式(1)または(2)で表される繰り返し単位構造を有するセルロースエステル樹脂(B)とを90:10〜60:40の質量比で含有し、かつ鹸化処理を施された光学フィルムであることを特徴とする。
以上コニカミノルタオプト(株)製)等が好ましく用いられる。
本発明に係る光学フィルムを貼合した偏光板を液晶表示装置に組み込むことによって、種々の視認性に優れた液晶表示装置を作製することができるが、特に大型の液晶表示装置やデジタルサイネージ等の屋外用途の液晶表示装置に好ましく用いられる。本発明に係る偏光板は、前記粘着層等を介して液晶セルに貼合する。
実施例1
〔アクリル樹脂の調製〕
以下のアクリル樹脂A1−A7、及びMS1、2を公知の方法によって調製した。
A2:モノマー質量比(MMA:MA=97:3)、Mw160000
A3:モノマー質量比(MMA:MA=97:3)、Mw350000
A4:モノマー質量比(MMA:MA=97:3)、Mw550000
A5:モノマー質量比(MMA:MA=97:3)、Mw800000
A6:モノマー質量比(MMA:MA=97:3)、Mw930000
A7:モノマー質量比(MMA:MA=94:6)、Mw1100000
MS1:モノマー質量比(MMA:ST=60:40)、Mw100000
MS2:モノマー質量比(MMA:ST=40:60)、Mw100000
MMA:メチルメタクリレート
MA:メチルアクリレート
ST:スチレン塗布材料(アクリル樹脂A8の合成)
先ず、メチルメタクリレート/アクリルアミド共重合体系懸濁剤を、次の様にして調整した。
アクリルアミド 80質量部
過硫酸カリウム 0.3質量部
イオン交換水 1500質量部
上記を反応器中に仕込み、反応器中を窒素ガスで置換しながら、単量体が完全に重合体に転化するまで、70℃に保ち反応を進行させた。得られた水溶液を懸濁剤とした。容量が5リットルで、バッフルおよびファウドラ型撹拌翼を備えたステンレス製オートクレーブに、上記懸濁剤0.05質量部をイオン交換水165質量部に溶解した溶液を供給し、系内を窒素ガスで置換しながら400rpmで撹拌した。
メチルメタクリレート 73質量部
t−ドデシルメルカプタン 1.2質量部
2,2′−アゾビスイソブチロニトリル 0.4質量部
添加後、70℃まで昇温し、内温が70℃に達した時点を重合開始時点として、180分間保ち、重合を進行させた。
ダイヤナールBR83(三菱レイヨン(株)製) Mw40000
ダイヤナールBR85(三菱レイヨン(株)製) Mw280000
ダイヤナールBR88(三菱レイヨン(株)製) Mw480000
80N(旭化成ケミカルズ(株)製) Mw100000
上記市販のアクリル樹脂における分子中のMMA単位の割合は、いずれも90質量%以上99質量%以下であった。
60℃×24時間の真空乾燥により絶乾状態としたセルロースジアセテート(酢化度55%、平均重合度160)100質量部と、60℃×24時間の真空乾燥によって絶乾状態としたL−ラクチド(ピュラック社製)200質量部を、ジムロート冷却管および熱電対を付け、N2雰囲気とした4つ口フラスコに仕込み、このフラスコをオイルバス中に浸漬して140℃とし、60分間撹拌して系を溶解させた。
〈光学フィルム1の作製〉
(ドープ液組成1)
ダイヤナールBR85(三菱レイヨン(株)製) 70質量部
セルロースエステル(セルロースアセテートプロピオネート アシル基総置換度2.75、アセチル基置換度0.19、プロピオニル基置換度2.56、Mw=200000)
30質量部
メチレンクロライド 300質量部
エタノール 40質量部
上記組成物を、加熱しながら十分に溶解し、ドープ液を作製した。
上記作製したドープ液を、ベルト流延装置を用い、温度22℃、2m幅でステンレスバンド支持体に均一に流延した。ステンレスバンド支持体で、残留溶剤量が100%になるまで溶媒を蒸発させ、剥離張力162N/mでステンレスバンド支持体上から剥離した。
上記光学フィルム1の作製において、アクリル樹脂(A)の種類と組成比を、表1に記載のように代えた以外は同様にして、光学フィルム2〜24を作製した。
光学フィルム25は、市販のシクロオレフィン樹脂フィルムである、ゼオノアフィルムZF14を用いた。
厚さ120μmの長尺ロールポリビニルアルコールフィルムを、沃素1質量部、ホウ酸4質量部を含む水溶液100質量部に浸漬し、50℃で5倍に搬送方向に延伸して偏光子を作製した。
23℃55%RHの雰囲気下において24時間保存した偏光板を、50mm(縦)×10mm(幅)で切り出し、同雰囲気下で切断部よりフィルムと偏光子との剥離を試みた。ここで(縦)とは、偏光子の延伸方向を示す。
23℃55%RHの雰囲気下において24時間保存した偏光板を、カッターで縦方向、横方向それぞれを裁断して、その切断部を以下のように評価した。
日立製32型ディスプレイW32−L7000の予め貼合されていた表側(観察者側)の偏光板のみを剥がして、上記作製した偏光板1〜26を、予め貼合されていた偏光板と同一の方向に吸収軸が向くようにそれぞれ貼合し、液晶表示装置1〜26を各々作製した。
上記作製した液晶表示装置1〜26に関して、23℃、55%RHの環境でディスプレイを黒表示にし、斜め45°の角度から観察した。続いて上記偏光板を60℃、90%RHで1000時間処理したものを同様に観察し、色変化を下記基準で評価した。
Claims (5)
- アクリル樹脂(A)とセルロースエステル樹脂(B)とを含有する光学フィルム用いた偏光板であって、当該光学フィルムが、分子内にメチルメタクリレート単位構造を50〜99質量%の範囲内で有し、重量平均分子量Mwが130000〜480000であるアクリル樹脂(A)と、下記一般式(1)または(2)で表される繰り返し単位構造を有するセルロースエステル樹脂(B)とを90:10〜60:40の質量比で含有し、かつ鹸化処理を施された光学フィルムであることを特徴とする偏光板。
(上記一般式中、A及びBは、炭素数1〜12の2価の炭化水素基またはヒドロキシル基で置換された炭素数1〜12の2価の炭化水素基を表す。但しA及びBは同じでも異なってもよい。) - 前記繰り返し単位構造の当該部分の数平均分子量が、50〜10000であることを特徴とする請求項1に記載の偏光板。
- 前記光学フィルムを構成する樹脂の総質量に対して、0.5〜30質量%のアクリル粒子(C)を含有することを特徴とする請求項1又は請求項2に記載の偏光板。
- 前記光学フィルムが、溶液流延法によって製膜されたことを特徴とする請求項1から請求項3までのいずれか一項に記載の偏光板。
- 請求項1から請求項4までのいずれか一項に記載の偏光板を用いたことを特徴とする液晶表示装置。
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| JP2007016137A (ja) * | 2005-07-08 | 2007-01-25 | Konica Minolta Opto Inc | 光学フィルム偏光板液晶表示装置 |
| WO2008126528A1 (ja) * | 2007-03-12 | 2008-10-23 | Konica Minolta Opto, Inc. | 防眩性反射防止フィルムの製造方法、防眩性反射防止フィルム、偏光板及び表示装置 |
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| JP2007016137A (ja) * | 2005-07-08 | 2007-01-25 | Konica Minolta Opto Inc | 光学フィルム偏光板液晶表示装置 |
| WO2008126528A1 (ja) * | 2007-03-12 | 2008-10-23 | Konica Minolta Opto, Inc. | 防眩性反射防止フィルムの製造方法、防眩性反射防止フィルム、偏光板及び表示装置 |
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