WO2022163759A1 - Film optique et dispositif d'affichage souple pourvu d'un film optique - Google Patents
Film optique et dispositif d'affichage souple pourvu d'un film optique Download PDFInfo
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- WO2022163759A1 WO2022163759A1 PCT/JP2022/003103 JP2022003103W WO2022163759A1 WO 2022163759 A1 WO2022163759 A1 WO 2022163759A1 JP 2022003103 W JP2022003103 W JP 2022003103W WO 2022163759 A1 WO2022163759 A1 WO 2022163759A1
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- Prior art keywords
- optical film
- group
- formula
- carbon atoms
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- 125000001931 aliphatic group Chemical group 0.000 claims description 31
- 125000000962 organic group Chemical group 0.000 claims description 26
- 125000003118 aryl group Chemical group 0.000 claims description 24
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- ISKQADXMHQSTHK-UHFFFAOYSA-N [4-(aminomethyl)phenyl]methanamine Chemical compound NCC1=CC=C(CN)C=C1 ISKQADXMHQSTHK-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 239000005456 alcohol based solvent Substances 0.000 description 1
- 230000001476 alcoholic effect Effects 0.000 description 1
- 125000002723 alicyclic group Chemical group 0.000 description 1
- 150000001338 aliphatic hydrocarbons Chemical class 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 125000005577 anthracene group Chemical group 0.000 description 1
- 229910000410 antimony oxide Inorganic materials 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 150000004982 aromatic amines Chemical class 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 125000000732 arylene group Chemical group 0.000 description 1
- 235000010233 benzoic acid Nutrition 0.000 description 1
- RWCCWEUUXYIKHB-UHFFFAOYSA-N benzophenone Chemical compound C=1C=CC=CC=1C(=O)C1=CC=CC=C1 RWCCWEUUXYIKHB-UHFFFAOYSA-N 0.000 description 1
- 239000012965 benzophenone Substances 0.000 description 1
- 150000008366 benzophenones Chemical class 0.000 description 1
- 150000001565 benzotriazoles Chemical class 0.000 description 1
- XMSVKICKONKVNM-UHFFFAOYSA-N bicyclo[2.2.1]heptane-3,4-diamine Chemical compound C1CC2(N)C(N)CC1C2 XMSVKICKONKVNM-UHFFFAOYSA-N 0.000 description 1
- 125000006267 biphenyl group Chemical group 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 1
- 229910052794 bromium Inorganic materials 0.000 description 1
- YHASWHZGWUONAO-UHFFFAOYSA-N butanoyl butanoate Chemical compound CCCC(=O)OC(=O)CCC YHASWHZGWUONAO-UHFFFAOYSA-N 0.000 description 1
- JHIWVOJDXOSYLW-UHFFFAOYSA-N butyl 2,2-difluorocyclopropane-1-carboxylate Chemical compound CCCCOC(=O)C1CC1(F)F JHIWVOJDXOSYLW-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Chemical group 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 229910000420 cerium oxide Inorganic materials 0.000 description 1
- 239000012295 chemical reaction liquid Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000004440 column chromatography Methods 0.000 description 1
- 239000013256 coordination polymer Substances 0.000 description 1
- 229930003836 cresol Natural products 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 125000000753 cycloalkyl group Chemical group 0.000 description 1
- 125000002933 cyclohexyloxy group Chemical group C1(CCCCC1)O* 0.000 description 1
- WOSVXXBNNCUXMT-UHFFFAOYSA-N cyclopentane-1,2,3,4-tetracarboxylic acid Chemical compound OC(=O)C1CC(C(O)=O)C(C(O)=O)C1C(O)=O WOSVXXBNNCUXMT-UHFFFAOYSA-N 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007607 die coating method Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 239000004210 ether based solvent Substances 0.000 description 1
- 125000001301 ethoxy group Chemical group [H]C([H])([H])C([H])([H])O* 0.000 description 1
- 229940116333 ethyl lactate Drugs 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 125000003983 fluorenyl group Chemical group C1(=CC=CC=2C3=CC=CC=C3CC12)* 0.000 description 1
- YBMRDBCBODYGJE-UHFFFAOYSA-N germanium oxide Inorganic materials O=[Ge]=O YBMRDBCBODYGJE-UHFFFAOYSA-N 0.000 description 1
- 238000007756 gravure coating Methods 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 125000005842 heteroatom Chemical group 0.000 description 1
- 125000000623 heterocyclic group Chemical group 0.000 description 1
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 1
- 125000004051 hexyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 238000004128 high performance liquid chromatography Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000010191 image analysis Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 229910003437 indium oxide Inorganic materials 0.000 description 1
- PJXISJQVUVHSOJ-UHFFFAOYSA-N indium(iii) oxide Chemical compound [O-2].[O-2].[O-2].[In+3].[In+3] PJXISJQVUVHSOJ-UHFFFAOYSA-N 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 125000003253 isopropoxy group Chemical group [H]C([H])([H])C([H])(O*)C([H])([H])[H] 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 229940018564 m-phenylenediamine Drugs 0.000 description 1
- 229910001512 metal fluoride Inorganic materials 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 description 1
- 125000002950 monocyclic group Chemical group 0.000 description 1
- 125000006606 n-butoxy group Chemical group 0.000 description 1
- BBDGYADAMYMJNO-UHFFFAOYSA-N n-butyl-n-ethylbutan-1-amine Chemical compound CCCCN(CC)CCCC BBDGYADAMYMJNO-UHFFFAOYSA-N 0.000 description 1
- VEBPYKMCKZTFPJ-UHFFFAOYSA-N n-butyl-n-propylbutan-1-amine Chemical compound CCCCN(CCC)CCCC VEBPYKMCKZTFPJ-UHFFFAOYSA-N 0.000 description 1
- 125000006610 n-decyloxy group Chemical group 0.000 description 1
- 125000006609 n-nonyloxy group Chemical group 0.000 description 1
- 125000006608 n-octyloxy group Chemical group 0.000 description 1
- 125000003935 n-pentoxy group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])O* 0.000 description 1
- 125000003506 n-propoxy group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])O* 0.000 description 1
- KQSABULTKYLFEV-UHFFFAOYSA-N naphthalene-1,5-diamine Chemical compound C1=CC=C2C(N)=CC=CC2=C1N KQSABULTKYLFEV-UHFFFAOYSA-N 0.000 description 1
- DOBFTMLCEYUAQC-UHFFFAOYSA-N naphthalene-2,3,6,7-tetracarboxylic acid Chemical compound OC(=O)C1=C(C(O)=O)C=C2C=C(C(O)=O)C(C(=O)O)=CC2=C1 DOBFTMLCEYUAQC-UHFFFAOYSA-N 0.000 description 1
- GOGZBMRXLADNEV-UHFFFAOYSA-N naphthalene-2,6-diamine Chemical compound C1=C(N)C=CC2=CC(N)=CC=C21 GOGZBMRXLADNEV-UHFFFAOYSA-N 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- 239000011146 organic particle Substances 0.000 description 1
- 239000011242 organic-inorganic particle Substances 0.000 description 1
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 1
- VTRUBDSFZJNXHI-UHFFFAOYSA-N oxoantimony Chemical compound [Sb]=O VTRUBDSFZJNXHI-UHFFFAOYSA-N 0.000 description 1
- PVADDRMAFCOOPC-UHFFFAOYSA-N oxogermanium Chemical compound [Ge]=O PVADDRMAFCOOPC-UHFFFAOYSA-N 0.000 description 1
- HVNWRBWNOPYOER-UHFFFAOYSA-N pentane-1,2,3,4-tetracarboxylic acid Chemical compound OC(=O)C(C)C(C(O)=O)C(C(O)=O)CC(O)=O HVNWRBWNOPYOER-UHFFFAOYSA-N 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 125000003367 polycyclic group Chemical group 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- WYVAMUWZEOHJOQ-UHFFFAOYSA-N propionic anhydride Chemical compound CCC(=O)OC(=O)CC WYVAMUWZEOHJOQ-UHFFFAOYSA-N 0.000 description 1
- LLHKCFNBLRBOGN-UHFFFAOYSA-N propylene glycol methyl ether acetate Chemical compound COCC(C)OC(C)=O LLHKCFNBLRBOGN-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 238000000425 proton nuclear magnetic resonance spectrum Methods 0.000 description 1
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- SBYHFKPVCBCYGV-UHFFFAOYSA-N quinuclidine Chemical compound C1CC2CCN1CC2 SBYHFKPVCBCYGV-UHFFFAOYSA-N 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- YGSDEFSMJLZEOE-UHFFFAOYSA-M salicylate Chemical compound OC1=CC=CC=C1C([O-])=O YGSDEFSMJLZEOE-UHFFFAOYSA-M 0.000 description 1
- 229960001860 salicylate Drugs 0.000 description 1
- 150000003873 salicylate salts Chemical class 0.000 description 1
- 125000005920 sec-butoxy group Chemical group 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000004528 spin coating Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000010897 surface acoustic wave method Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical compound [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 description 1
- 125000004213 tert-butoxy group Chemical group [H]C([H])([H])C(O*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- OAXARSVKYJPDPA-UHFFFAOYSA-N tert-butyl 4-prop-2-ynylpiperazine-1-carboxylate Chemical compound CC(C)(C)OC(=O)N1CCN(CC#C)CC1 OAXARSVKYJPDPA-UHFFFAOYSA-N 0.000 description 1
- 125000001973 tert-pentyl group Chemical group [H]C([H])([H])C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- 125000003944 tolyl group Chemical group 0.000 description 1
- 150000003918 triazines Chemical class 0.000 description 1
- 150000003628 tricarboxylic acids Chemical class 0.000 description 1
- YFTHZRPMJXBUME-UHFFFAOYSA-N tripropylamine Chemical compound CCCN(CCC)CCC YFTHZRPMJXBUME-UHFFFAOYSA-N 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 125000005023 xylyl group Chemical group 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
- C08K3/013—Fillers, pigments or reinforcing additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L79/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen or carbon only, not provided for in groups C08L61/00 - C08L77/00
- C08L79/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C08L79/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/22—Absorbing filters
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
Definitions
- the present invention relates to an optical film and a flexible display device comprising the optical film.
- Optical films are used in various applications such as display devices such as liquid crystal and organic EL, touch sensors, speakers, and semiconductors.
- display devices such as liquid crystal and organic EL
- touch sensors touch sensors
- speakers and semiconductors.
- a touch sensor substrate material a polyimide film having dimensional stability is known (for example, Patent Documents 1 and 2).
- the aromatic polyimide film described in Patent Document 1 did not necessarily have high gas barrier properties.
- the aliphatic polyimide film described in Patent Document 2 tends to have low UV-cutting properties and high water absorption, and it is difficult to achieve both high UV-cutting properties and gas barrier properties.
- an object of the present invention is to provide an optical film excellent in ultraviolet shielding properties and gas barrier properties, and a flexible display device comprising the optical film.
- the optical film contains a polyimide resin having a structural unit derived from an aliphatic diamine, and has a light transmittance at 350 nm of 10% or less and a photoelasticity.
- the inventors have found that the above problem can be solved by reducing the coefficient to 50 ⁇ 10 ⁇ 12 Pa ⁇ 1 or less, and have completed the present invention. That is, the present invention includes the following preferred aspects.
- An optical film comprising a polyimide resin having a structural unit derived from an aliphatic diamine, having a light transmittance at 350 nm of 10% or less and a photoelastic coefficient of 50 ⁇ 10 ⁇ 12 Pa ⁇ 1 or less.
- the optical film of [1] which has a humidity expansion coefficient of more than 10 ppm.
- the optical film of [1] or [2] which has a water absorption rate of 2.5% or less at 60°C.
- the polyimide resin has the formula (1): [In formula (1), X represents a divalent organic group, Y represents a tetravalent organic group, and * represents a bond]
- R 2 to R 7 each independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms or an aryl group having 6 to 12 carbon atoms,
- the hydrogen atoms contained in R 2 to R 7 may be independently substituted with halogen atoms, and V is a single bond, —O—, —CH 2 —, —CH 2 —CH 2 —, — CH(CH 3 )—, —C(CH 3 ) 2 —, —C(CF 3 ) 2 —, —SO 2 —, —S—, —CO— or —N(R 8 )—, and R 8 represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 12 carbon atoms which may be substituted with a halogen atom, * represents a bond]
- a flexible display device comprising the optical film according to any one of [1] to [10].
- the flexible display device according to [11] further comprising a polarizing plate.
- an optical film excellent in ultraviolet shielding properties and gas barrier properties it is possible to provide an optical film excellent in ultraviolet shielding properties and gas barrier properties, and a flexible display device comprising the optical film.
- the optical film of the present invention contains a polyimide resin having structural units derived from an aliphatic diamine, has a light transmittance at 350 nm of 10% or less, and a photoelastic coefficient of 50 ⁇ 10 ⁇ 12 Pa ⁇ 1 or less.
- an optical film containing a polyimide resin having a structural unit derived from an aliphatic diamine exhibits excellent gas barrier properties when the photoelastic coefficient is 50 ⁇ 10 ⁇ 12 Pa ⁇ 1 or less. found that can be achieved.
- excellent gas barrier properties or “high gas barrier properties” means that both the water vapor permeability and the oxygen permeability are low, and the water vapor permeability is preferably 100 g/m 2 . /24 hours/0.1 mm or less, indicating that the oxygen permeability satisfies 1000 cc (NTP)/m 2 /24 hours/0.1 mm/atm.
- a polyimide resin means a polymer containing a repeating structural unit (also referred to as a structural unit) containing an imide group, and may further contain a repeating structural unit containing an amide group.
- the polyimide resin contains structural units derived from aliphatic diamines.
- An aliphatic diamine represents a diamine having an aliphatic group, and may contain other substituents in part of its structure, but does not have an aromatic ring.
- the polyimide-based resin contains structural units derived from an aliphatic diamine, the photoelastic coefficient of the optical film tends to decrease, and as a result, the gas barrier properties of the optical film tend to increase.
- Aliphatic diamines include, for example, acyclic aliphatic diamines and cycloaliphatic diamines, and acyclic aliphatic diamines are preferred because they tend to increase the gas barrier properties of the optical film.
- Acyclic aliphatic diamines include, for example, 1,2-diaminoethane, 1,3-diaminopropane, 1,4-diaminobutane, 1,5-diaminopentane, 1,6-diaminohexane, 1,2 -Diaminopropane, 1,2-diaminobutane, 1,3-diaminobutane, 2-methyl-1,2-diaminopropane, 2-methyl-1,3-diaminopropane, and other linear chain having 2 to 10 carbon atoms or branched diaminoalkanes.
- Cycloaliphatic diamines include, for example, 1,3-bis(aminomethyl)cyclohexane, 1,4-bis(aminomethyl)cyclohexane, norbornanediamine and 4,4'-diaminodicyclohexylmethane. These can be used alone or in combination of two or more.
- 1,2-diaminoethane, 1,3-diaminopropane, 1,4-diaminobutane (sometimes referred to as 1,4-DAB), 1, 1, and 1,2-diaminoethane, 1,3-diaminopropane, 1,4-diaminobutane (sometimes referred to as 1,4-DAB), 1, 5-diaminopentane, 1,6-diaminohexane, 1,2-diaminopropane, 1,2-diaminobutane, 1,3-diaminobutane, 2-methyl-1,2-diaminopropane, 2-methyl-1, Diaminoalkanes having 2 to 10 carbon atoms such as 3-diaminopropane are preferred, diaminoalkanes having 2 to 6 carbon atoms are more preferred, and 1,4-diaminobutane is even more preferred.
- the polyimide resin may contain structural units derived from aromatic diamines in addition to structural units derived from aliphatic diamines.
- An aromatic diamine represents a diamine having an aromatic ring, and may contain an aliphatic group or other substituents in part of its structure.
- This aromatic ring may be a single ring or a condensed ring, and examples include, but are not limited to, benzene ring, naphthalene ring, anthracene ring, and fluorene ring.
- aromatic diamines examples include p-phenylenediamine, m-phenylenediamine, 2,4-toluenediamine, m-xylylenediamine, p-xylylenediamine, 1,5-diaminonaphthalene and 2,6-diaminonaphthalene.
- the polyimide-based resin can further contain a structural unit derived from a tetracarboxylic acid compound.
- a structural unit derived from a tetracarboxylic acid compound When a structural unit derived from a tetracarboxylic acid compound is contained, solvent resistance, heat resistance, optical properties and tensile strength are likely to be improved.
- tetracarboxylic acid compounds include aromatic tetracarboxylic acid compounds such as aromatic tetracarboxylic dianhydride; and aliphatic tetracarboxylic acid compounds such as aliphatic tetracarboxylic dianhydride.
- a tetracarboxylic acid compound may be used independently and may be used in combination of 2 or more type.
- the tetracarboxylic acid compound may be a dianhydride or a tetracarboxylic acid compound analog such as an acid chloride compound.
- aromatic tetracarboxylic dianhydrides include non-condensed polycyclic aromatic tetracarboxylic dianhydrides, monocyclic aromatic tetracarboxylic dianhydrides and condensed polycyclic aromatic tetracarboxylic dianhydrides.
- Carboxylic acid dianhydrides are mentioned.
- Non-fused polycyclic aromatic tetracarboxylic dianhydrides include, for example, 4,4′-oxydiphthalic dianhydride, 3,3′,4,4′-benzophenonetetracarboxylic dianhydride, 2,2 ',3,3'-benzophenonetetracarboxylic dianhydride, 3,3',4,4'-biphenyltetracarboxylic dianhydride (sometimes referred to as BPDA), 2,2',3,3 '-biphenyltetracarboxylic dianhydride, 3,3',4,4'-diphenylsulfonetetracarboxylic dianhydride, 2,2-bis(3,4-dicarboxyphenyl)propane dianhydride, 2, 2-bis(2,3-dicarboxyphenyl)propane dianhydride, 2,2-bis(3,4-dicarboxyphenoxyphenyl)propane dianhydride, 4,4'-(hex
- the monocyclic aromatic tetracarboxylic dianhydrides include, for example, 1,2,4,5-benzenetetracarboxylic dianhydrides, and condensed polycyclic aromatic tetracarboxylic dianhydrides. Examples include 2,3,6,7-naphthalenetetracarboxylic dianhydride. These can be used singly or in combination of two or more.
- the aliphatic tetracarboxylic dianhydrides include cyclic or acyclic aliphatic tetracarboxylic dianhydrides.
- the cyclic aliphatic tetracarboxylic dianhydride is a tetracarboxylic dianhydride having an alicyclic hydrocarbon structure, and specific examples thereof include 1,2,4,5-cyclohexanetetracarboxylic dianhydride.
- 1,2,3,4-cyclobutanetetracarboxylic dianhydride 1,2,3,4-cyclobutanetetracarboxylic dianhydride, cycloalkanetetracarboxylic dianhydride such as 1,2,3,4-cyclopentanetetracarboxylic dianhydride, bicyclo[2.2 .2] oct-7-ene-2,3,5,6-tetracarboxylic dianhydride, dicyclohexyl-3,3′,4,4′-tetracarboxylic dianhydride and positional isomers thereof be done. These can be used alone or in combination of two or more.
- acyclic aliphatic tetracarboxylic dianhydride examples include 1,2,3,4-butanetetracarboxylic dianhydride and 1,2,3,4-pentanetetracarboxylic dianhydride. and these can be used alone or in combination of two or more.
- a cyclic aliphatic tetracarboxylic dianhydride and an acyclic aliphatic tetracarboxylic dianhydride may also be used in combination.
- tetracarboxylic dianhydrides 4,4'-oxydiphthalic dianhydride, 3,3',4,4'-benzophenonetetracarboxylic dianhydride, 3,3′,4,4′-biphenyltetracarboxylic dianhydride, 2,2′,3,3′-biphenyltetracarboxylic dianhydride, 3,3′,4,4′-diphenylsulfonetetracarboxylic acid acid dianhydride, 2,2-bis(3,4-dicarboxyphenyl)propane dianhydride, 4,4′-(hexafluoroisopropylidene)diphthalic dianhydride, and mixtures thereof are preferred; 4'-(Hexafluoroisopropylidene)diphthalic dianhydride (6FDA) is more preferred.
- the ratio of structural units derived from an aliphatic diamine is preferably 30 mol% or more, more preferably 50 mol% or more, relative to the total molar amount of all structural units constituting the polyimide resin. , more preferably 70 mol % or more, particularly preferably 90 mol % or more, and preferably 100 mol % or less.
- the ratio of the structural unit derived from the aliphatic diamine is within the above range, the optical film tends to have high gas barrier properties.
- the ratio of the structural units can be measured using, for example, 1 H-NMR, or can be calculated from the charging ratio of raw materials.
- the polyimide resin in addition to the structural units derived from the tetracarboxylic acid compound, other structural units derived from tetracarboxylic acid and structural units derived from tricarboxylic acid, as long as the various physical properties of the optical film are not impaired. It may further contain structural units derived from their anhydrides and derivatives.
- tetracarboxylic acids include water adducts of anhydrides of the tetracarboxylic acid compounds.
- tricarboxylic acid compounds include aromatic tricarboxylic acids, aliphatic tricarboxylic acids, their analogous acid chloride compounds, acid anhydrides, and the like, and two or more of them may be used in combination. Specific examples include anhydride of 1,2,4-benzenetricarboxylic acid; 2,3,6-naphthalenetricarboxylic acid-2,3-anhydride; a single bond between phthalic anhydride and benzoic acid; , —CH 2 —, —C(CH 3 ) 2 —, —C(CF 3 ) 2 —, —SO 2 —, or compounds linked by a phenylene group.
- the polyimide resin has the formula (1): [In formula (1), X represents a divalent organic group, Y represents a tetravalent organic group, and * represents a bond]
- X preferably contains a divalent aliphatic group.
- Each X in formula (1) independently represents a divalent organic group, preferably a divalent organic group having 2 to 40 carbon atoms.
- divalent organic groups include divalent aromatic groups and divalent aliphatic groups.
- a divalent aromatic group is a divalent organic group having an aromatic group, and may contain an aliphatic group or other substituents in part of its structure.
- a divalent aliphatic group is a divalent organic group having an aliphatic group, and may contain other substituents in part of its structure, but does not contain an aromatic group.
- X in formula (1) includes a divalent aliphatic group
- the divalent aliphatic group includes, for example, a divalent acyclic aliphatic group or a divalent cycloaliphatic group.
- a divalent acyclic aliphatic group is preferable from the viewpoints of less stacking between molecules, a dense structure, and easy reduction of the photoelastic coefficient of the optical film.
- the divalent acyclic aliphatic group for X in formula (1) includes, for example, ethylene group, trimethylene group, tetramethylene group, pentamethylene group, hexamethylene group and propylene group.
- 1,2-butanediyl group, 1,3-butanediyl group, 2-methyl-1,2-propanediyl group, 2-methyl-1,3-propanediyl group, and other linear or branched alkylene groups is mentioned.
- a hydrogen atom in the divalent acyclic aliphatic group may be substituted with a halogen atom, and a carbon atom may be substituted with a heteroatom (eg, oxygen atom, nitrogen atom, etc.).
- the number of carbon atoms in the linear or branched alkylene group is preferably 2 or more, more preferably 3 or more, still more preferably 4 or more, and preferably 10 or less, from the viewpoint of easily increasing the gas barrier properties of the optical film. It is preferably 8 or less, more preferably 6 or less.
- alkylene groups having 2 to 6 carbon atoms such as ethylene group, trimethylene group, tetramethylene group, pentamethylene group and hexamethylene group are used from the viewpoint of easily increasing the gas barrier properties of the optical film. groups are preferred, and tetramethylene groups are more preferred.
- the divalent aromatic group or divalent cycloaliphatic group for X in formula (1) includes formula (10), formula (11), formula (12), formula (13), a group represented by formula (14), formula (15), formula (16), formula (17) and formula (18); a group represented by those formulas (10) to (18) groups in which hydrogen atoms therein are substituted with methyl groups, fluoro groups, chloro groups or trifluoromethyl groups; and chain hydrocarbon groups having 6 or less carbon atoms.
- V 1 , V 2 and V 3 are each independently a single bond, —O—, —S—, —CH 2 —, —CH 2 —CH 2 —, —CH(CH 3 )—, —C(CH 3 ) represents 2- , -C(CF 3 ) 2 -, -SO 2 -, -CO- or -N(Q)-;
- Q represents a monovalent hydrocarbon group having 1 to 12 carbon atoms which may be substituted with a halogen atom.
- the monovalent hydrocarbon group having 1 to 12 carbon atoms which may be substituted with a halogen atom includes, for example, methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, sec-butyl group, tert -butyl group, n-pentyl group, 2-methyl-butyl group, 3-methylbutyl group, 2-ethyl-propyl group, n-hexyl group, n-heptyl group, n-octyl group, tert-octyl group, n- nonyl group, n-decyl group and the like.
- halogen atom examples include a fluorine atom, a chlorine atom, a bromine atom and an iodine atom.
- V 1 and V 3 are a single bond, -O- or -S- and V 2 is -CH 2 -, -C(CH 3 ) 2 -, -C(CF 3 ) 2 - or -SO 2 -.
- the bonding positions of V 1 and V 2 to each ring and the bonding positions of V 2 and V 3 to each ring independently of each other are preferably meta-position or para-position, more preferably para-position. rank.
- the hydrogen atoms on the rings in formulas (10) to (18) are substituted with an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or an aryl group having 6 to 12 carbon atoms. good too.
- alkyl groups having 1 to 6 carbon atoms include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, sec-butyl group, tert-butyl group, n-pentyl group, 2-methyl- butyl group, 3-methylbutyl group, 2-ethyl-propyl group, n-hexyl group and the like.
- alkoxy groups having 1 to 6 carbon atoms include methoxy, ethoxy, propyloxy, isopropyloxy, butoxy, isobutoxy, tert-butoxy, pentyloxy, hexyloxy and cyclohexyloxy groups. mentioned.
- Examples of the aryl group having 6 to 12 carbon atoms include phenyl group, tolyl group, xylyl group, naphthyl group and biphenyl group. These divalent cycloaliphatic groups or divalent aromatic groups can be used alone or in combination of two or more.
- the polyimide resin may contain multiple types of X, and the multiple types of X may be the same or different.
- X in formula (1) may include a divalent acyclic aliphatic group, a divalent aromatic group and/or a divalent cycloaliphatic group.
- the ratio of structural units in which X in formula (1) is a divalent aliphatic group, preferably a divalent acyclic aliphatic group is represented by formula (1) It is preferably 30 mol% or more, more preferably 50 mol% or more, still more preferably 70 mol% or more, particularly preferably 90 mol% or more, and preferably 100 mol% or less based on the total molar amount of the structural units. be.
- the ratio of structural units in which X in formula (1) is a divalent aliphatic group, preferably a divalent acyclic aliphatic group is within the above range, the gas barrier properties of the optical film are likely to be enhanced.
- the ratio of the structural units can be measured using, for example, 1 H-NMR, or can be calculated from the charging ratio of raw materials.
- each Y independently represents a tetravalent organic group, preferably a tetravalent organic group having 4 to 40 carbon atoms, more preferably a tetravalent organic group having 4 to 40 carbon atoms and having a cyclic structure. represents a valent organic group.
- Cyclic structures include alicyclic, aromatic and heterocyclic structures.
- the organic group is an organic group in which a hydrogen atom may be substituted with a hydrocarbon group or a fluorine-substituted hydrocarbon group.
- the number of carbon atoms is preferably 1-8.
- the polyimide-based resin of the present invention may contain multiple types of Y, and the multiple types of Y may be the same or different.
- Y is represented by the following formula (20), formula (21), formula (22), formula (23), formula (24), formula (25), formula (26), formula (27), formula (28) and a group represented by the formula (29); a group in which the hydrogen atoms in the groups represented by the formulas (20) to (29) are substituted with a methyl group, a fluoro group, a chloro group or a trifluoromethyl group and a tetravalent chain hydrocarbon group having 6 or less carbon atoms.
- W 1 is a single bond, —O—, —CH 2 —, —CH 2 —CH 2 —, —CH(CH 3 )—, —C(CH 3 ) 2 —, —C(CF 3 ) 2 —, -Ar-, -SO 2 -, -CO-, -O-Ar-O-, -Ar-O-Ar-, -Ar-CH 2 -Ar-, -Ar-C(CH 3 ) 2 -Ar- or -Ar-SO 2 -Ar-.
- Ar represents an arylene group having 6 to 20 carbon atoms in which a hydrogen atom may be substituted with a fluorine atom, and specific examples thereof include a phenylene group.
- W 1 is each independently a single bond, —O—, —CH 2 —, —CH 2 —CH 2 —, —CH(CH 3 )—, — preferably C(CH 3 ) 2 - or -C(CF 3 ) 2 -, a single bond, -O-, -CH 2 -, -CH(CH 3 )-, -C(CH 3 ) 2 - or -C(CF 3 ) 2 -, more preferably a single bond, -C(CH 3 ) 2 - or -C(CF 3 ) 2 -.
- the structural unit represented by formula (1) is represented by Y as represented by formula (2):
- R 2 to R 7 each independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms or an aryl group having 6 to 12 carbon atoms
- the hydrogen atoms contained in R 2 to R 7 may be independently substituted with halogen atoms
- V is a single bond, —O—, —CH 2 —, —CH 2 —CH 2 —, — CH(CH 3 )—, —C(CH 3 ) 2 —, —C(CF 3 ) 2 —, —SO 2 —, —S—, —CO— or —N(R 8 )—
- R 8 represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 12 carbon atoms which may be substituted with a halogen atom
- * represents a bond
- R 2 , R 3 , R 4 , R 5 , R 6 and R 7 are each independently a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or It represents an aryl group having 6 to 12 carbon atoms.
- the alkyl group having 1 to 6 carbon atoms, the alkoxy group having 1 to 6 carbon atoms, and the aryl group having 6 to 12 carbon atoms are respectively the alkyl group having 1 to 6 carbon atoms and the alkoxy group having 1 to 6 carbon atoms as exemplified above. and aryl groups having 6 to 12 carbon atoms.
- R 2 to R 7 each independently represent preferably a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, more preferably a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, wherein R 2 to Hydrogen atoms contained in R7 may be independently substituted with halogen atoms.
- Halogen atoms include fluorine, chlorine, bromine and iodine atoms.
- V is a single bond, -O-, -CH 2 -, -CH 2 -CH 2 -, -CH(CH 3 )-, -C(CH 3 ) 2 -, -C(CF 3 ) 2 -, - represents SO 2 -, -S-, -CO- or -N(R 8 )-, where R 8 is a hydrogen atom or a monovalent hydrocarbon having 1 to 12 carbon atoms which may be substituted with a halogen atom; represents a group.
- the monovalent hydrocarbon group having 1 to 12 carbon atoms which may be substituted with a halogen atom is exemplified above. things are mentioned.
- V is a single bond, —O—, —CH 2 —, —CH(CH 3 )—, —C(CH 3 ) 2 — or —C( CF 3 ) 2 — is preferred, and a single bond, —C(CH 3 ) 2 — or —C(CF 3 ) 2 — is more preferred, and a single bond or —C(CF 3 ) 2 — It is even more preferable to have
- formula (2) is represented by formula (2'): [In formula (2′), * represents a bond] is represented by
- the gas barrier property of the optical film can be more easily improved.
- the fluorine element-containing skeleton improves the solubility of the resin in a solvent, suppresses the viscosity of the varnish, and facilitates the processing of the optical film.
- Y in formula (1) when Y in formula (1) contains a structure represented by formula (2), Y in formula (1) is the proportion of structural units represented by formula (2) is preferably 30 mol% or more, more preferably 50 mol% or more, still more preferably 70 mol% or more, and particularly preferably 90 mol% or more, based on the total molar amount of the structural units represented by formula (1). and preferably 100 mol % or less.
- the ratio of the structural unit represented by formula (2) for Y in formula (1) is within the above range, the gas barrier properties of the optical film are likely to be enhanced.
- the proportion of structural units in which Y in formula (1) is represented by formula (2) can be measured, for example, using 1 H-NMR, or can be calculated from the charging ratio of raw materials.
- the polyimide resin contains a structural unit represented by formula (30) and/or a structural unit represented by formula (31) in addition to the structural unit represented by formula (1). good too.
- Y 1 is a tetravalent organic group, preferably an organic group in which a hydrogen atom in the organic group may be substituted with a hydrocarbon group or a fluorine-substituted hydrocarbon group.
- Y 1 is represented by formula (20), formula (21), formula (22), formula (23), formula (24), formula (25), formula (26), formula (27), formula (28) and a group represented by the formula (29), a group in which hydrogen atoms in the groups represented by the formulas (20) to (29) are substituted with a methyl group, a fluoro group, a chloro group or a trifluoromethyl group; and tetravalent chain hydrocarbon groups having 6 or less carbon atoms.
- the polyimide resin may contain multiple types of Y 1 , and the multiple types of Y 1 may be the same or different.
- Y 2 is a trivalent organic group, preferably an organic group in which a hydrogen atom in the organic group may be substituted with a hydrocarbon group or a fluorine-substituted hydrocarbon group.
- Y 2 is represented by the above formula (20), formula (21), formula (22), formula (23), formula (24), formula (25), formula (26), formula (27), formula (28) ), a group in which one of the bonds of the group represented by formula (29) is replaced with a hydrogen atom, and a trivalent chain hydrocarbon group having 6 or less carbon atoms.
- the polyimide-based resin may contain multiple types of Y 2 , and the multiple types of Y 2 may be the same or different.
- X 1 and X 2 independently represent a divalent organic group, preferably a divalent organic group having 2 to 40 carbon atoms.
- the divalent organic group include a divalent aromatic group and a divalent aliphatic group.
- the divalent aliphatic group include a divalent acyclic aliphatic group and a divalent Cycloaliphatic groups are included.
- the above formula (10), formula (11), formula (12), formula (13), and formula (14) , groups represented by formula (15), formula (16), formula (17) and formula (18); hydrogen atoms in the groups represented by formulas (10) to (18) are methyl groups, a group substituted with a fluoro group, a chloro group or a trifluoromethyl group; and a chain hydrocarbon group having 6 or less carbon atoms.
- divalent acyclic aliphatic groups examples include ethylene, trimethylene, tetramethylene, pentamethylene, hexamethylene, propylene, 1,2-butanediyl, 1,3-butanediyl, 2 -Methyl-1,2-propanediyl group, 2-methyl-1,3-propanediyl group, and the like linear or branched alkylene groups having 2 to 10 carbon atoms.
- the polyimide resin is a structural unit represented by the formula (1), and optionally a structural unit represented by the formula (30) and a structural unit represented by the formula (31) It consists of at least one selected structural unit.
- the ratio of the structural units represented by the formula (1) in the polyimide resin is the total structural units contained in the polyimide resin, for example, the ratio represented by the formula (1). and optionally at least one structural unit selected from structural units represented by formula (30) and structural units represented by formula (31), preferably 80 mol % or more, more preferably 90 mol % or more, and still more preferably 95 mol % or more.
- the upper limit of the ratio of the structural unit represented by Formula (1) is 100 mol%.
- the ratio can be measured, for example, using 1 H-NMR, or can be calculated from the charging ratio of raw materials.
- the polyimide-based resin in the present invention is preferably a polyimide resin because it easily enhances the gas barrier properties of the optical film.
- the polyimide resin may contain a halogen atom, preferably a fluorine atom, which can be introduced by, for example, the halogen-containing atom substituent described above.
- a halogen atom preferably a fluorine atom
- the gas barrier property of the optical film tends to be enhanced.
- Preferred fluorine-containing substituents for allowing the polyimide resin to contain fluorine atoms include, for example, a fluoro group and a trifluoromethyl group.
- the content of halogen atoms in the polyimide resin is preferably 1 to 40% by mass, more preferably 5 to 40% by mass, and still more preferably 5 to 30% by mass, based on the mass of the polyimide resin.
- the halogen atom content is equal to or more than the lower limit and equal to or less than the upper limit, the gas barrier properties of the optical film tend to increase. In addition, synthesis tends to be easy.
- the imidization rate of the polyimide resin is preferably 90% or higher, more preferably 93% or higher, and still more preferably 95% or higher.
- the imidization ratio is preferably at least the above lower limit, since the gas barrier properties of the optical film can be easily improved. Moreover, the upper limit of the imidization rate is 100%.
- the imidization ratio indicates the ratio of the molar amount of imide bonds in the polyimide resin to twice the molar amount of the structural units derived from the tetracarboxylic acid compound in the polyimide resin.
- the polyimide resin contains a tricarboxylic acid compound
- a value twice the molar amount of the structural units derived from the tetracarboxylic acid compound in the polyimide resin, and the molar amount of the structural units derived from the tricarboxylic acid compound It shows the ratio of the molar amount of imide bonds in the polyimide resin to the total of .
- the imidization rate can be determined by IR method, NMR method, or the like.
- the content of the polyimide resin contained in the optical film is preferably 40% by mass or more, more preferably 50% by mass or more, based on the mass of the optical film (100% by mass). It is preferably 60% by mass, particularly preferably 80% by mass or more, and preferably 100% by mass or less.
- the content of the polyimide resin contained in the optical film is within the above range, the gas barrier properties of the optical film tend to increase.
- a commercially available product may be used as the polyimide resin, or it may be produced by a conventional method.
- the method for producing the polyimide resin is not particularly limited, for example, the polyimide resin containing the structural unit represented by formula (1) is obtained by reacting a diamine compound and a tetracarboxylic acid compound to obtain a polyamic acid, and It can be produced by a method including a step of imidizing the polyamic acid. In addition to the tetracarboxylic acid compound, a tricarboxylic acid compound may be reacted.
- the tetracarboxylic acid compound, the diamine compound and the tricarboxylic acid compound used in the synthesis of the polyimide resin are the same as the tetracarboxylic acid compound, the diamine compound and the tricarboxylic acid compound described in the [Polyimide resin] section, respectively. can be used.
- the amounts of the diamine compound, the tetracarboxylic acid compound and the tricarboxylic acid compound to be used can be appropriately selected according to the desired ratio of each structural unit of the resin.
- the amount of the diamine compound used is preferably 0.94 mol or more, more preferably 0.96 mol or more, still more preferably 0.98 mol or more, per 1 mol of the tetracarboxylic acid compound. mol or more, particularly preferably 0.99 mol or more, preferably 1.20 mol or less, more preferably 1.10 mol or less, even more preferably 1.05 mol or less, particularly preferably 1.02 mol or less .
- the amount of the diamine compound used relative to the tetracarboxylic acid compound is within the above range, the resulting optical film tends to have enhanced gas barrier properties.
- the reaction temperature of the diamine compound and the tetracarboxylic acid compound is not particularly limited, and may be, for example, 5 to 200° C.
- the reaction time is also not particularly limited, and may be, for example, about 30 minutes to 72 hours.
- the reaction temperature is preferably 5 to 50°C, more preferably 5 to 40°C, still more preferably 5 to 25°C
- the reaction time is preferably 3 to 24 hours, More preferably 5 to 20 hours. With such a reaction temperature and reaction time, the resulting optical film tends to have enhanced gas barrier properties.
- the reaction between the diamine compound and the tetracarboxylic acid compound is preferably carried out in a solvent.
- the solvent is not particularly limited as long as it does not affect the reaction, but examples include water, methanol, ethanol, ethylene glycol, isopropyl alcohol, propylene glycol, ethylene glycol methyl ether, ethylene glycol butyl ether, 1-methoxy-2-propanol, Alcohol solvents such as 2-butoxyethanol and propylene glycol monomethyl ether; Phenol solvents such as phenol and cresol; Ethyl acetate, butyl acetate, ethylene glycol methyl ether acetate, ⁇ -butyrolactone, ⁇ -valerolactone, propylene glycol methyl ether acetate , ethyl lactate and other ester solvents; acetone, methyl ethyl ketone, cyclopentanone, cyclohexanone, 2-heptanone, methyl iso
- phenol-based solvents and amide-based solvents can be preferably used from the viewpoint of solubility.
- the solvent used in the reaction is preferably a solvent that has been rigorously dehydrated to a water content of 700 ppm or less. The use of such a solvent tends to enhance the gas barrier properties of the resulting optical film.
- the reaction between the diamine compound and the tetracarboxylic acid compound may be carried out under conditions of an inert atmosphere (nitrogen atmosphere, argon atmosphere, etc.) or reduced pressure, if necessary, and an inert atmosphere (nitrogen atmosphere, argon atmosphere, etc.). It is preferable to conduct the reaction in a strictly controlled dehydrated solvent while stirring. Under such conditions, the gas barrier properties of the resulting optical film tend to be enhanced.
- imidization may be performed using an imidization catalyst, imidization by heating, or a combination thereof.
- the imidization catalyst used in the imidization step include aliphatic amines such as tripropylamine, dibutylpropylamine and ethyldibutylamine; N-ethylpiperidine, N-propylpiperidine, N-butylpyrrolidine, N-butylpiperidine, and cycloaliphatic amines (monocyclic) such as N-propylhexahydroazepine; azabicyclo[2.2.1]heptane, azabicyclo[3.2.1]octane, azabicyclo[2.2.2]octane, and Alicyclic amines (polycyclic) such as azabicyclo[3.2.2]nonane; and pyridine, 2-methylpyridine (2-picoline), 3-methylpyridine (3-picoline), 4-methylpyridine
- Acid anhydrides include conventional acid anhydrides used in imidization reactions, and specific examples thereof include aliphatic acid anhydrides such as acetic anhydride, propionic anhydride and butyric anhydride, and aromatic acid anhydrides such as phthalic acid. and acid anhydrides.
- the reaction temperature is preferably 40°C or higher, more preferably 60°C or higher, still more preferably 80°C or higher, and preferably 190°C or lower, more preferably 170°C. 150° C. or less, more preferably 150° C. or less.
- the reaction time for the imidization step is preferably 30 minutes to 24 hours, more preferably 1 to 12 hours. When the reaction temperature and reaction time are within the above ranges, the resulting optical film tends to have enhanced gas barrier properties.
- the weight average molecular weight (Mw) of the polyimide resin is preferably 50,000 or more, more preferably 100,000 or more, still more preferably 120,000 or more, and particularly preferably 150,000 or more. , very particularly preferably ⁇ 200,000, preferably ⁇ 800,000, more preferably ⁇ 700,000, even more preferably ⁇ 600,000.
- the weight average molecular weight (Mw) can be obtained by performing gel permeation chromatography (GPC) measurement and converting to standard polystyrene, and can be calculated, for example, by the method described in Examples.
- the polyimide resin may be isolated (separated and purified) by a conventional method such as filtration, concentration, extraction, crystallization, recrystallization, column chromatography or other separation means, or a combination of these separation means.
- the resin can be isolated by adding a large amount of alcohol such as methanol to the reaction solution containing the resin to precipitate the resin, followed by concentration, filtration, drying, and the like.
- the optical film of the present invention contains a polyimide resin having structural units derived from an aliphatic diamine, has a light transmittance at 350 nm of 10% or less, and a photoelastic coefficient of 50 ⁇ 10 ⁇ 12 Pa ⁇ 1 or less.
- the optical film of the present invention contains a polyimide resin having a structural unit derived from an aliphatic diamine, has a light transmittance at 350 nm of 10% or less, and has a photoelastic coefficient of 50 ⁇ 10 ⁇ 12 Pa ⁇ 1 or less. , excellent in UV protection and gas barrier properties.
- the optical film of the present invention has high barrier properties against ultraviolet rays, oxygen and water vapor, it is required to have high visibility under visible light, and is suitable for flexible display devices and the like whose performance tends to deteriorate due to water, oxygen, and the like. Available.
- the optical film of the present invention has a photoelastic coefficient of 50 ⁇ 10 ⁇ 12 Pa ⁇ 1 or less.
- the photoelastic coefficient is 50 ⁇ 10 ⁇ 12 Pa ⁇ 1 or less, the optical film has excellent gas barrier properties. If the photoelastic coefficient exceeds 50 ⁇ 10 ⁇ 12 Pa ⁇ 1 , it may be difficult to obtain high gas barrier properties.
- the photoelastic coefficient is preferably 45 ⁇ 10 ⁇ 12 Pa ⁇ 1 or less, more preferably 35 ⁇ 10 ⁇ 12 Pa ⁇ 1 or less, still more preferably 30 ⁇ 10 ⁇ 12 Pa ⁇ 1 or less, preferably 5 ⁇ 10 ⁇ 12 Pa ⁇ 1 or more, more preferably 7.5 ⁇ 10 ⁇ 12 Pa ⁇ 1 or more, still more preferably 10 ⁇ 10 ⁇ 12 Pa ⁇ 1 or more, still more preferably 12.5 ⁇ 10 ⁇ 12 Pa ⁇ 1 or more , particularly preferably 15 ⁇ 10 ⁇ 12 Pa ⁇ 1 or more, more preferably 17.5 ⁇ 10 ⁇ 12 Pa ⁇ 1 or more, still more preferably 20 ⁇ 10 ⁇ 12 Pa ⁇ 1 or more, still more preferably 22.5 ⁇ 10 ⁇ 12 Pa ⁇ 1 or more.
- the photoelastic coefficient is the type and composition ratio of the structural units that make up the resin contained in the optical film; the molecular weight of the resin; the solvent content of the optical film; the type and amount of additives; It can be adjusted within the above range by appropriately adjusting conditions, etc.
- the type and composition ratio of structural units constituting the resin contained in the optical film; the solvent content of the optical film; the manufacturing conditions of the optical film, etc. can be adjusted within the above range by appropriate adjustment.
- the photoelastic coefficient can be measured using a phase difference measuring device, for example, by the method described in Examples below.
- the optical film of the present invention has a light transmittance of 10% or less at 350 nm.
- the light transmittance at 350 nm is 10% or less, the optical film is excellent in ultraviolet shielding properties. If the light transmittance at 350 nm exceeds 10%, the UV shielding property tends to be lowered.
- the light transmittance of the optical film of the present invention at 350 nm is preferably 8% or less, more preferably 5% or less. When the light transmittance at 350 nm is equal to or less than the upper limit, the ultraviolet shielding property can be improved.
- the lower limit of light transmittance at 350 nm is 0%.
- the light transmittance at 350 nm is preferably the light transmittance within the range of the thickness (film thickness) of the optical film of the present invention.
- the light transmittance at 350 nm is based on the types and composition ratios of structural units that constitute the resin contained in the optical film; the thickness of the optical film; the solvent content of the optical film; the types and amounts of additives; The above range can be achieved by appropriately adjusting the conditions, the purity of the monomer, and the manufacturing conditions of the optical film.
- Cheap The light transmittance at 350 nm can be measured using an ultraviolet-visible-near-infrared spectrophotometer, for example, by the method described in Examples.
- the humidity expansion coefficient (hereinafter also referred to as “CME”) of the optical film of the present invention is preferably 5 ppm or more, more preferably 10 ppm or more, still more preferably 10 ppm or more, even more preferably 20 ppm or more, and very preferably It is 27 ppm or more, preferably 100 ppm or less, more preferably 80 ppm or less, and still more preferably 60 ppm or less.
- the coefficient of humidity expansion refers to a value measured by the method described in Examples below under conditions of 60° C. and 90% RH.
- the humidity expansion coefficient is determined by adjusting the type and composition ratio of the structural units that make up the resin contained in the optical film; the solvent content of the optical film; the type and amount of additives; can be adjusted within the above range.
- the humidity expansion coefficient can be measured using a thermomechanical analyzer (TMA), for example, by the method described in Examples below.
- the optical film of the present invention can exhibit excellent gas barrier properties even when the humidity expansion coefficient is relatively high, for example, over 10 ppm, preferably 20 ppm or more. Since the optical film of the present invention has such properties, when the optical film of the present invention is used in a display device or the like, the display device can be protected from water vapor and oxygen, and at the same time, it can be used in a normal (non-low-humidity environment) clean room. It is advantageous because it is possible to form a film at
- the water absorption rate of the optical film of the present invention at 60° C. is preferably 2.5% or less, more preferably 2.1% or less, and still more preferably 1.9% or less. be.
- the lower limit of the water absorption rate is usually 0%.
- the water absorption rate is determined by appropriately adjusting the types and composition ratios of structural units that make up the resin contained in the optical film; the solvent content of the optical film; the types and amounts of additives; the manufacturing conditions for the resin; can be adjusted within the above range.
- the water absorption can be measured by using a thermal analyzer (TG/DTA6200) with specifications for high temperature and high humidity, and can be measured, for example, by the method described in Examples below.
- the solvent content (also referred to as residual solvent content) is preferably 7.0% by mass or less, more preferably 3.5% by mass or less, still more preferably 2% by mass, based on the mass of the optical film. 0.5% by mass or less, more preferably 1.4% by mass or less.
- the solvent content is equal to or less than the upper limit, the gas barrier properties of the optical film are likely to be enhanced.
- the lower limit of the solvent content is usually 0.01% by mass.
- the solvent content can be adjusted within the above range by appropriately adjusting the type of solvent, the type of substrate, drying conditions (especially drying temperature, drying time, etc.), etc. in the optical film manufacturing process described below.
- the solvent content can be measured, for example, by the method described in Examples below.
- the light transmittance at 500 nm of the optical film of the present invention is preferably 90.0% or higher, more preferably 90.2% or higher, still more preferably 90.3% or higher, and particularly preferably 90.4% or higher.
- the upper limit of the light transmittance at 500 nm is 100% or less. Therefore, in a preferred embodiment of the present invention, the optical film can have good transmittance not only in the ultraviolet region but also in the visible light region.
- the light transmittance at 500 nm is preferably the light transmittance within the range of the thickness (film thickness) of the optical film of the present invention, and more preferably the light transmittance at 25 ⁇ m.
- the light transmittance at 500 nm is based on the types and composition ratios of structural units that constitute the resin contained in the optical film; the thickness of the optical film; the solvent content of the optical film; the types and amounts of additives; It can be adjusted within the above range by appropriately adjusting the conditions, the purity of the monomer, and the manufacturing conditions of the optical film.
- the light transmittance at 500 nm can be measured using an ultraviolet-visible-near-infrared spectrophotometer, for example, by the method described in Examples below.
- the film thickness (also referred to as thickness) of the optical film of the present invention is preferably 10 ⁇ m or more, more preferably 20 ⁇ m or more, and preferably 100 ⁇ m or less, more preferably 80 ⁇ m or less.
- the film thickness can be adjusted within the above range, for example, by appropriately adjusting the film forming conditions when producing the optical film.
- the film thickness of the optical film can be measured using a digital thickness gauge or the like, for example, by the method described in Examples below.
- the optical film of the present invention has a glass transition temperature (sometimes abbreviated as Tg) of preferably 165°C or higher, more preferably 170°C or higher, still more preferably 175°C or higher, and even more preferably 175°C or higher. It is preferably 180°C or higher, particularly preferably above 180°C, particularly more preferably 180.5°C or higher, even more preferably 181°C or higher, extremely preferably 182°C or higher, preferably 400°C or lower, more preferably 400°C or lower. 380° C. or lower, more preferably 350° C. or lower, particularly preferably 300° C. or lower.
- Tg glass transition temperature
- the glass transition temperature is the glass transition temperature by DSC (differential scanning calorimetry).
- the glass transition temperature is determined by the type and composition ratio of the structural units that make up the resin contained in the optical film; the solvent content of the optical film; the type and blending amount of additives;
- the above range can be achieved by appropriately adjusting the conditions.
- the type and composition ratio of the structural units constituting the resin are preferably selected as described above, and the solvent content of the optical film is adjusted. It may be adjusted to the above range by applying the drying conditions in the optical film manufacturing process.
- the glass transition temperature can be measured, for example, by DSC (differential scanning calorimetry) using a thermal analyzer under the following conditions: amount of sample measured: 5 mg; temperature range: room temperature to 400°C; temperature increase rate: 10°C/min. can.
- DSC differential scanning calorimetry
- the optical film of the present invention has a tensile strength of preferably 70 MPa or higher, more preferably 80 MPa or higher, still more preferably 85 MPa or higher, even more preferably 86 MPa or higher, and particularly preferably 87 MPa or higher. More preferably 89 MPa or more, still more preferably 95 MPa or more, extremely preferably 100 MPa or more, preferably 200 MPa or less, more preferably 180 MPa or less.
- the tensile strength is at least the above lower limit, it is easy to suppress damage to the optical film.
- the tensile strength can be measured using a tensile tester or the like under the conditions of a distance between chucks of 50 mm and a tensile speed of 20 mm/min. For example, it can be measured by the method described in Examples.
- the tensile strength is determined by the type and composition ratio of the structural units that make up the resin contained in the optical film; the solvent content of the optical film; the molecular weight of the resin; the type and amount of additives; it can be set within the above range by appropriately adjusting the manufacturing conditions of the optical film.
- the optical film of the invention may contain an ultraviolet absorber.
- an ultraviolet absorber By containing an ultraviolet absorber, the light absorption in the ultraviolet region can be easily reduced. Therefore, in the optical film of the present invention having a photoelastic coefficient of 50 ⁇ 10 ⁇ 12 Pa ⁇ 1 or less, both UV cut property and gas barrier property can be enhanced.
- ultraviolet absorbers examples include benzotriazole derivatives (benzotriazole-based ultraviolet absorbers), triazine derivatives (triazine-based ultraviolet absorbers) such as 1,3,5-triphenyltriazine derivatives (triazine-based ultraviolet absorbers), benzophenone derivatives (benzophenone-based ultraviolet absorbers ), and salicylate derivatives (salicylate-based ultraviolet absorbers), and at least one selected from the group consisting of these can be used.
- Benzotriazole-based UV absorbers have UV absorbency of 300 to 400 nm, preferably around 320 to 360 nm, and can improve the UV cut property of optical films without reducing the transmittance in the visible light range.
- triazine-based UV absorbers preferably benzotriazole-based UV absorbers.
- benzotriazole-based UV absorbers include the compound represented by formula (I), trade name manufactured by Sumitomo Chemical Co., Ltd.: Sumisorb (registered trademark) 250 (2-[2-hydroxy-3-(3 ,4,5,6-tetrahydrophthalimido-methodiyl)-5-methylphenyl]benzotriazole), trade name manufactured by BASF Japan Ltd.: Tinuvin (registered trademark) 360 (2,2′-methylenebis[6-(2H -benzotriazol-2-yl)-4-tert-octylphenol]) and Tinuvin 213 (methyl 3-[3-(2H-benzotriazol-2-yl)5-tert-butyl-4-hydroxyphenyl]propionate with PEG300 and reaction products), which can be used alone or in combination of two or more.
- formula (I) trade name manufactured by Sumitomo Chemical Co., Ltd.: Sumisorb (registered trademark) 250 (2-[2-hydroxy-3-(3
- Specific examples of the compound represented by formula (I) include trade names of Sumitomo Chemical Co., Ltd.: Sumisorb 200 (2-(2-hydroxy-5-methylphenyl)benzotriazole), Sumisorb 300 (2-(3 -tert-butyl-2-hydroxy-5-methylphenyl)-5-chlorobenzotriazole), Sumisorb 340 (2-(2-hydroxy-5-tert-octylphenyl)benzotriazole), Sumisorb 350 (2-(2 -Hydroxy 3,5-di-tert-pentylphenyl)benzotriazole) and BASF Japan Ltd.
- Tinuvin 327 (2-(2'-hydroxy-3',5'-di-tert-butyl phenyl)-5-chlorobenzotriazole), Tinuvin 571 (2-(2H-benzotriazol-2-yl)-6-dodecyl-4-methyl-phenol) and Tinuvin 234 (2-(2H-benzotriazol-2-yl )-4,6-bis(1-methyl-1-phenylethyl)phenol) and ADEKA Corporation's product name: ADEKA STAB (registered trademark) LA-31 (2,2'-methylenebis[6-(2H-benzo triazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol]).
- the ultraviolet absorber is preferably the compound represented by formula (I) and Tinuvin 213 (methyl 3-[3-(2H-benzotriazol-2-yl) 5-tert-butyl-4-hydroxyphenyl]propionate It is a reaction product with PEG300, more preferably trade names manufactured by Sumitomo Chemical Co., Ltd.: Sumisorb 200 (2-(2-hydroxy-5-methylphenyl)benzotriazole), Sumisorb 300 (2-(3-tert -butyl-2-hydroxy-5-methylphenyl)-5-chlorobenzotriazole), Sumisorb 340 (2-(2-hydroxy-5-tert-octylphenyl)benzotriazole), Sumisorb 350 (2-(2-hydroxy 3,5-di-tert-pentylphenyl)benzotriazole), product name of ADEKA Corporation: ADEKA STAB LA-31 (2,2'-methylenebis[6-(2H-benzotriazol-2-yl)-4- (1,1,
- Tinuvin 327 (2-(2′-hydroxy-3′,5′-di-tert-butylphenyl )-5-chlorobenzotriazole) and Tinuvin 571 (2-(2H-benzotriazol-2-yl)-6-dodecyl-4-methyl-phenol), most preferably manufactured by Sumitomo Chemical Co., Ltd.
- X I is a hydrogen atom, a fluorine atom, a chlorine atom, an alkyl group having 1 to 5 carbon atoms or an alkoxy group having 1 to 5 carbon atoms
- R I1 and R I2 are each independently a hydrogen atom. or a hydrocarbon group having 1 to 20 carbon atoms
- at least one of R 11 and R 12 is a hydrocarbon group having 1 to 20 carbon atoms.
- the alkyl group having 1 to 5 carbon atoms in X I includes methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, sec-butyl group, tert-butyl group, n-pentyl group, 2- Examples include methyl-butyl group, 3-methylbutyl group, 2-ethyl-propyl group and the like.
- the alkoxy group having 1 to 5 carbon atoms in X I includes a methoxy group, ethoxy group, n-propoxy group, isopropoxy group, n-butoxy group, sec-butoxy group, tert-butoxy group, n-pentyloxy group, 2-methyl-butoxy group, 3-methylbutoxy group, 2-ethyl-propoxy group and the like.
- X I is preferably a hydrogen atom, a fluorine atom, a chlorine atom or a methyl group, more preferably a hydrogen atom, a fluorine atom or a chlorine atom.
- R 11 and R 12 each independently represent a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms, and at least one of R 11 and R 12 is a hydrocarbon group.
- R I1 and R I2 is a hydrocarbon group, it is preferably a hydrocarbon group having 1 to 12 carbon atoms, more preferably a hydrocarbon group having 1 to 8 carbon atoms. Specific examples include methyl group, tert-butyl group, tert-pentyl group and tert-octyl group.
- Triazine-based ultraviolet absorber is used in an optical film containing a polyimide resin.
- Triazine-based UV absorbers include compounds represented by the following formula (II).
- a specific example thereof is the product name of ADEKA Corporation: ADEKA STAB LA-46 (2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-[2-(2-ethyl hexanoyloxy)ethoxy]phenol), trade name manufactured by BASF Japan Ltd.: Tinuvin 400 (2-[4-[2-hydroxy-3-tridecyloxypropyl]oxy]-2-hydroxyphenyl]-4,6 -bis(2,4-dimethylphenyl)-1,3,5-triazine), 2-[4-[2-hydroxy-3-didecyloxypropyl]oxy]-2-hydroxyphenyl]-4,6-bis (2,4-dimethylphenyl)-1,3,5-triazine), Tinuvin 4
- KEMISORB registered trademark
- the compound represented by formula (II) is preferably Adekastab LA-46(2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-[2-(2-ethyl hexanoyloxy)ethoxy]phenol).
- Y I1 to Y I4 are each independently a hydrogen atom, a fluorine atom, a chlorine atom, a hydroxy group, an alkyl group having 1 to 20 carbon atoms or an alkoxy group having 1 to 20 carbon atoms, preferably is a hydrogen atom, an alkyl group having 1 to 12 carbon atoms or an alkoxy group having 1 to 12 carbon atoms, more preferably a hydrogen atom.
- R I3 is a hydrogen atom, a hydrocarbon group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms containing one oxygen atom, or an alkylketooxy having 1 to 12 carbon atoms.
- It is an alkoxy group having 2 to 4 carbon atoms, more preferably an alkoxy group having 2 to 4 carbon atoms substituted with an alkylketooxy group having 8 to 12 carbon atoms.
- alkyl groups having 1 to 20 carbon atoms as Y I1 to Y I4 include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, sec-butyl group, tert-butyl group, n -pentyl group, n-hexyl group, n-heptyl group, n-octyl group, n-nonyl group, n-decyl group, n-dodecyl group and n-undecyl group.
- alkoxy groups having 1 to 20 carbon atoms include methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, sec-butoxy, tert-butoxy, n-pentyloxy, n -hexyloxy group, n-heptyloxy group, n-octyloxy group, n-nonyloxy group, n-decyloxy group, n-dodecyloxy group and n-undecyloxy group.
- the ultraviolet absorber preferably has a light absorption of 300 to 400 nm, more preferably a light absorption of 320 to 360 nm, and even more preferably a light absorption of around 350 nm.
- the content of the ultraviolet absorber is preferably 0.1 parts by mass or more, more preferably 0.5 parts by mass or more, with respect to 100 parts by mass of the polyimide resin. More preferably 0.8 parts by mass or more, particularly preferably 1 part by mass or more, preferably 10 parts by mass or less, more preferably 8 parts by mass or less, and even more preferably 5 parts by mass or less.
- the content of the UV absorber is at least the above lower limit, the UV blocking property of the optical film is likely to be improved, and when the content of the UV absorber is below the above upper limit, the transparency and mechanical properties of the optical film are improved. Easy to raise.
- the optical film of the present invention may contain at least one filler.
- the gas barrier properties of the optical film particularly the oxygen permeability
- the filler include organic particles and inorganic particles, preferably inorganic particles.
- inorganic particles include metal oxide particles such as silica, zirconia, alumina, titania, zinc oxide, germanium oxide, indium oxide, tin oxide, indium tin oxide (ITO), antimony oxide, and cerium oxide;
- metal fluoride particles such as sodium chloride.
- silica particles, zirconia particles, and alumina particles are preferred from the viewpoint of easily increasing the gas barrier properties of the optical film, and silica particles are more preferred. .
- These fillers can be used singly or in combination of two or more.
- the average primary particle size of the filler preferably silica particles
- the average primary particle size of the filler is usually 1 nm or more, preferably 5 nm or more, more preferably 10 nm or more, still more preferably 15 nm or more, particularly preferably 20 nm or more, and preferably 100 nm or less, more preferably It is 80 nm or less, more preferably 60 nm or less, still more preferably 40 nm or less.
- the average primary particle size of the filler can be measured by the BET method.
- the average primary particle size may be measured by image analysis using a transmission electron microscope or a scanning electron microscope.
- the content of the filler is usually 0.1% by mass or more, preferably 1% by mass or more, more preferably 5% by mass, based on the mass of the optical film. % by mass or more, more preferably 10% by mass or more, preferably 60% by mass or less, more preferably 50% by mass or less, and even more preferably 40% by mass or less.
- the content of the filler is within the above range, it is easy to improve the gas barrier property while maintaining the transparency of the optical film.
- the optical film of the present invention may further contain additives other than UV absorbers and fillers.
- additives include, for example, antioxidants, release agents, stabilizers, bluing agents, flame retardants, pH adjusters, silica dispersants, lubricants, thickeners, and leveling agents.
- the content thereof is preferably 0.001 to 20% by mass, more preferably 0.01 to 15% by mass, and still more preferably 0.1 to 20% by mass, based on the mass of the optical film. It may be 10% by mass.
- optical film of the present invention are not particularly limited, and various applications such as substrates for touch sensors, materials for flexible display devices, protective films, films for bezel printing, semiconductor applications, speaker diaphragms, IR cut filters, etc. You may
- the optical film of the present invention may be a single layer or a laminate.
- the optical film of the present invention may be used as it is, or may be used as a laminate with another film. .
- the optical film includes all layers laminated on one side or both sides of the optical film.
- the optical film of the present invention is a laminate, it preferably has one or more functional layers on at least one surface of the optical film.
- functional layers include a hard coat layer, a primer layer, a gas barrier layer, an ultraviolet absorption layer, an adhesive layer, a hue adjustment layer, a refractive index adjustment layer and the like.
- a functional layer can be used individually or in combination of 2 or more types.
- the optical film may have a protective film on at least one side (single side or both sides).
- the protective film may be laminated on the optical film side surface or the functional layer side surface, or may be laminated on both the optical film side and the functional layer side.
- the protective film may be laminated on one functional layer side surface, or may be laminated on both functional layer side surfaces.
- the protective film is a film for temporarily protecting the surface of the optical film or the functional layer, and is not particularly limited as long as it is a peelable film capable of protecting the surface of the optical film or the functional layer.
- protective films include polyester resin films such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate; polyolefin resin films such as polyethylene and polypropylene films; acrylic resin films; It is preferably selected from the group consisting of a terephthalate resin film and an acrylic resin film.
- each protective film may be the same or different.
- the thickness of the protective film is not particularly limited, but is usually 10-120 ⁇ m, preferably 15-110 ⁇ m, more preferably 20-100 ⁇ m. When the optical film has two protective films, the thickness of each protective film may be the same or different.
- the optical film is not particularly limited, but for example the following steps: (a) a step of preparing a liquid (sometimes referred to as varnish) containing a polyimide resin (varnish preparation step); (b) a step of applying a varnish to a substrate to form a coating film (coating step); and (c) a step of drying the applied liquid (coating film) to form an optical film (optical film forming step). ) It can be manufactured by a method comprising
- the varnish is prepared by dissolving the polyimide resin in a solvent, adding the additives described below as necessary, and stirring and mixing.
- the solvent used for preparing the varnish is not particularly limited as long as it can dissolve the resin.
- solvents include amide solvents such as N,N-dimethylacetamide (DMAc) and N,N-dimethylformamide (DMF); lactone solvents such as ⁇ -butyrolactone (GBL) and ⁇ -valerolactone; ketone solvents such as methyl ethyl ketone, cyclopentanone, cyclohexanone, 2-heptanone and methyl isobutyl ketone; sulfur-containing solvents such as dimethylsulfone, dimethylsulfoxide and sulfolane; carbonate solvents such as ethylene carbonate and propylene carbonate; and combinations thereof is mentioned.
- amide solvents such as N,N-dimethylacetamide (DMAc) and N,N-dimethylformamide (DMF)
- lactone solvents such as ⁇ -butyrolactone (GBL) and ⁇ -valerol
- amide-based solvents lactone-based solvents, and ketone-based solvents are preferred from the viewpoint of resin solubility.
- These solvents can be used alone or in combination of two or more.
- the varnish may also contain water, alcoholic solvents, acyclic ester solvents, etheric solvents, and the like.
- the solid content concentration of the varnish is preferably 1-30% by mass, more preferably 5-25% by mass, and still more preferably 10-20% by mass.
- the solid content of the varnish indicates the total amount of the components of the varnish excluding the solvent.
- the viscosity of the varnish is preferably 5 to 100 Pa ⁇ s, more preferably 10 to 50 Pa ⁇ s. When the viscosity of the varnish is within the above range, the optical film can be easily made uniform, and an optical film having a uniform thickness can be easily obtained.
- the viscosity of the varnish can be measured using a viscometer, for example, by the method described in Examples.
- the varnish is applied to the substrate by a known coating method to form a coating film.
- known coating methods include wire bar coating, reverse coating, roll coating such as gravure coating, die coating, comma coating, lip coating, spin coating, screen coating, fountain coating, dipping, Examples include a spray method and a casting method.
- the optical film can be formed by drying the coating film and peeling it off from the substrate.
- a drying process for drying the optical film may be performed after the peeling. Drying of the coating film can be carried out at a temperature of usually 50 to 350°C, preferably 50 to 220°C. In a preferred embodiment, the drying is preferably done in stages. Varnishes containing high molecular weight resins tend to have high viscosities, and optical films obtained from such varnishes tend to have non-uniform thicknesses. Such an optical film tends to locally deteriorate in gas barrier properties. Therefore, by performing stepwise drying, the varnish containing the high-molecular-weight resin can be dried uniformly, making it easier to obtain an optical film having excellent gas barrier properties.
- heating can be performed at 185-220°C. Drying (or heating time) is preferably 5 minutes to 5 hours, more preferably 10 minutes to 1 hour.
- drying is preferably 5 minutes to 5 hours, more preferably 10 minutes to 1 hour.
- stepwise heating from a low temperature to a high temperature within such a range an optical film having a uniform thickness can be obtained, and an optical film having a higher gas barrier property can be easily obtained. Also, the appearance of the optical film tends to be better.
- drying of the coating may be performed under inert atmospheric conditions. Further, if the optical film is dried under vacuum conditions, fine air bubbles may be generated and remain in the film, which may cause deterioration of transparency, and therefore drying under atmospheric pressure is preferable.
- base materials include glass substrates, PET films, PEN films, and other polyimide resin or polyamide resin films.
- glass, PET film, PEN film and the like are preferred from the viewpoint of excellent heat resistance, and glass substrates and PET films are more preferred from the viewpoint of adhesion to polyimide films and cost.
- the optical film of the present invention can be suitably used as a substrate for display devices, particularly touch sensors.
- display devices include wearable devices such as televisions, smartphones, mobile phones, car navigation systems, tablet PCs, mobile game machines, electronic paper, indicators, bulletin boards, watches, and smart watches.
- the present invention includes flexible display devices comprising the optical film of the present invention.
- the flexible display device include display devices having flexible characteristics, such as televisions, smartphones, mobile phones, and smart watches.
- a specific configuration of the flexible display device is not particularly limited, but includes, for example, a configuration including a laminate for a flexible display device and an organic EL display panel.
- Such a flexible display device of the present invention preferably further includes a polarizing plate and/or a touch sensor. Commonly used polarizing plates or touch sensors may be used, and these may be included in the laminate for a flexible display device.
- Polarizing plates include, for example, circularly polarizing plates, and touch sensors include various modes such as a resistive film system, a surface acoustic wave system, an infrared system, an electromagnetic induction system, and a capacitance system.
- the optical film of the present invention can be used as the touch sensor substrate (or touch sensor film).
- the laminate for a flexible display device preferably further includes a window film on the viewing side.
- the sensor and the polarizing plate may be laminated in this order. These members may be laminated using an adhesive or pressure-sensitive adhesive, and other members other than these members may be included.
- the water absorption (weight change) % was calculated from the following formula.
- Water absorption (mg) sample weight (mg) at each humidity - sample weight (mg) without humidification
- Water absorption rate (%) water absorption amount (mg) / sample weight without humidification (mg) x 100 The water absorption rate at 60° C. and 90% RH was obtained from the above formula.
- the mass reduction rate S (mass%) from 120 ° C to 250 ° C was calculated according to the following formula (1).
- S (% by mass) 100 - (W1/W0) x 100 (1)
- W0 is the mass of the sample after being held at 120 ° C. for 5 minutes
- W1 250 is the mass of the sample in ° C
- the calculated mass reduction rate S was defined as the residual solvent amount S (% by mass) in the optical film.
- Light transmittance at 350 nm and 500 nm The light transmittance at 350 nm and 500 nm in the optical films obtained in Examples and Comparative Examples was measured using an ultraviolet-visible-near-infrared spectrophotometer V-670 manufactured by JASCO Corporation. obtained by measuring the rate.
- the glass transition temperatures (Tg) of the optical films obtained in Examples and Comparative Examples were measured by DSC (differential scanning calorimetry) using a thermal analyzer (“DSC Q200”, manufactured by TA Instruments). The measurement conditions were as follows: amount of sample to be measured: 5 mg; temperature range: room temperature to 400°C; heating rate: 10°C/min.
- the tensile strength of the optical films obtained in Examples and Comparative Examples was measured using a precision universal tester (“Autograph AG-IS” manufactured by Shimadzu Corporation) as follows. The optical film was cut into a width of 10 mm and a length of 100 mm to prepare a strip-shaped test piece. Next, using the precision universal testing machine, a tensile test was performed under the conditions of a distance between chucks of 50 mm and a tensile speed of 20 mm/min to measure the tensile strength of the optical film.
- Example 1 A varnish was prepared by dissolving the polyimide resin obtained in Synthesis Example 1 in cyclohexanone so that the solid content concentration was 15% by mass, and adding 2 phr of Sumisorb 340 as an ultraviolet absorber (UVA). The viscosity of the varnish was 26 Pa ⁇ s. Next, the obtained varnish was applied to a glass substrate, heated at 140° C. for 10 minutes, further heated at 200° C. for 30 minutes, and peeled off from the glass substrate to obtain an optical film with a thickness of 25 ⁇ m. The amount of residual solvent in the obtained optical film was 1.2% by mass.
- UVA ultraviolet absorber
- Example 2 The polyimide resin obtained in Synthesis Example 1 was dissolved in cyclohexanone so that the solid content concentration was 15% by mass, and 2 phr of Sumisorb 340 was added as an ultraviolet absorber (UVA). Next, silica (product name: CHO-ST-M, manufacturer name: Nissan Chemical Industries, Ltd., average primary particle size: 22 nm) was added to 20% by mass relative to the polyimide resin to prepare a varnish. The viscosity of the varnish was 10 Pa ⁇ s. The obtained varnish was applied to a glass substrate, heated at 140° C. for 10 minutes, further heated at 200° C. for 30 minutes, and peeled off from the glass substrate to obtain an optical film with a thickness of 25 ⁇ m. The amount of residual solvent in the obtained optical film was 1.5% by mass. The content of silica was 16.4% by mass with respect to the mass of the optical film.
- UVA ultraviolet absorber
- Table 1 shows the evaluation results of the physical properties and gas barrier properties of the optical films obtained in Examples and Comparative Examples.
- the optical films of Examples 1 and 2 having small photoelastic coefficients had low water vapor permeability and low oxygen permeability, and had excellent gas barrier properties.
- the light transmittance at 350 nm was low, and the ultraviolet shielding property was also excellent. Therefore, it was found that the optical films of Examples 1 and 2 are excellent in both ultraviolet shielding properties and gas barrier properties.
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Abstract
La présente invention concerne un film optique : qui contient une résine de polyimide ayant une unité structurale dérivée d'une diamine aliphatique ; qui a une transmittance de lumière à 350 nm de 10 % ou moins ; et qui a un coefficient photoélastique ne dépassant pas 50×10-12Pa-1.
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WO2022004856A1 (fr) * | 2020-07-02 | 2022-01-06 | 住友化学株式会社 | Film optique |
JP2022012975A (ja) * | 2020-07-02 | 2022-01-18 | 住友化学株式会社 | ポリイミド系樹脂を含む長尺状光学フィルムの製造方法 |
JP2022013625A (ja) * | 2020-07-02 | 2022-01-18 | 住友化学株式会社 | 光学フィルム |
JP2022022728A (ja) * | 2020-07-02 | 2022-02-07 | 住友化学株式会社 | ポリイミド系樹脂を含む光学フィルムの製造方法 |
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2021
- 2021-01-29 JP JP2021013625A patent/JP2022117110A/ja active Pending
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2022
- 2022-01-27 WO PCT/JP2022/003103 patent/WO2022163759A1/fr active Application Filing
- 2022-01-27 TW TW111103709A patent/TW202239818A/zh unknown
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JP2019073707A (ja) * | 2017-06-05 | 2019-05-16 | 住友化学株式会社 | フィルム、フィルムの光学的均質性の評価方法及びフィルムの製造方法 |
JP2020510126A (ja) * | 2017-06-30 | 2020-04-02 | エルジー・ケム・リミテッド | ポリイミド系共重合体およびこれを含むポリイミド系フィルム |
JP2020536993A (ja) * | 2017-10-05 | 2020-12-17 | ザイマージェン インコーポレイテッド | 光学的に透明なポリイミド |
JP2019194301A (ja) * | 2018-04-27 | 2019-11-07 | 住友化学株式会社 | 光学フィルム |
JP2020023671A (ja) * | 2018-07-30 | 2020-02-13 | 東レ株式会社 | ポリイミド前駆体樹脂組成物、ポリイミド樹脂組成物およびその膜状物、それを含む積層体、ならびにフレキシブルデバイス |
JP2021042381A (ja) * | 2019-09-12 | 2021-03-18 | デュポン エレクトロニクス インコーポレイテッド | ポリイミドフィルム及び電子デバイス |
WO2022004856A1 (fr) * | 2020-07-02 | 2022-01-06 | 住友化学株式会社 | Film optique |
JP2022012975A (ja) * | 2020-07-02 | 2022-01-18 | 住友化学株式会社 | ポリイミド系樹脂を含む長尺状光学フィルムの製造方法 |
JP2022013625A (ja) * | 2020-07-02 | 2022-01-18 | 住友化学株式会社 | 光学フィルム |
JP2022022728A (ja) * | 2020-07-02 | 2022-02-07 | 住友化学株式会社 | ポリイミド系樹脂を含む光学フィルムの製造方法 |
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WO2023101006A1 (fr) * | 2021-12-03 | 2023-06-08 | 住友化学株式会社 | Procédé de production d'une résine à base de polyimide |
Also Published As
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TW202239818A (zh) | 2022-10-16 |
JP2022117110A (ja) | 2022-08-10 |
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