WO2023276892A1 - 樹脂シート成型用離型フィルム - Google Patents
樹脂シート成型用離型フィルム Download PDFInfo
- Publication number
- WO2023276892A1 WO2023276892A1 PCT/JP2022/025370 JP2022025370W WO2023276892A1 WO 2023276892 A1 WO2023276892 A1 WO 2023276892A1 JP 2022025370 W JP2022025370 W JP 2022025370W WO 2023276892 A1 WO2023276892 A1 WO 2023276892A1
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- WO
- WIPO (PCT)
- Prior art keywords
- release
- layer
- film
- release film
- release layer
- Prior art date
Links
- 229920005989 resin Polymers 0.000 title claims abstract description 149
- 239000011347 resin Substances 0.000 title claims abstract description 149
- 238000000465 moulding Methods 0.000 title claims abstract description 43
- -1 polydimethylsiloxane Polymers 0.000 claims abstract description 82
- 239000004205 dimethyl polysiloxane Substances 0.000 claims abstract description 66
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims abstract description 66
- 239000000203 mixture Substances 0.000 claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000010410 layer Substances 0.000 claims description 333
- 239000002245 particle Substances 0.000 claims description 90
- 125000002091 cationic group Chemical group 0.000 claims description 86
- 239000000919 ceramic Substances 0.000 claims description 67
- 239000002344 surface layer Substances 0.000 claims description 55
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- 238000000034 method Methods 0.000 claims description 36
- 229920006267 polyester film Polymers 0.000 claims description 26
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- 150000002484 inorganic compounds Chemical class 0.000 claims description 10
- 229910010272 inorganic material Inorganic materials 0.000 claims description 9
- 230000007547 defect Effects 0.000 abstract description 13
- 239000000463 material Substances 0.000 abstract description 8
- 238000005096 rolling process Methods 0.000 abstract 1
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- 238000001723 curing Methods 0.000 description 38
- 239000000047 product Substances 0.000 description 33
- 239000011254 layer-forming composition Substances 0.000 description 29
- 239000010954 inorganic particle Substances 0.000 description 25
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 24
- 229920000139 polyethylene terephthalate Polymers 0.000 description 24
- 239000005020 polyethylene terephthalate Substances 0.000 description 24
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 22
- 239000007787 solid Substances 0.000 description 22
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 21
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 21
- 238000000576 coating method Methods 0.000 description 20
- 239000002253 acid Substances 0.000 description 19
- 238000006243 chemical reaction Methods 0.000 description 19
- 229920001296 polysiloxane Polymers 0.000 description 19
- 238000001035 drying Methods 0.000 description 18
- 238000012545 processing Methods 0.000 description 18
- 239000011248 coating agent Substances 0.000 description 17
- 125000003700 epoxy group Chemical group 0.000 description 14
- 239000000126 substance Substances 0.000 description 14
- 125000002723 alicyclic group Chemical group 0.000 description 13
- 230000000694 effects Effects 0.000 description 13
- 230000005764 inhibitory process Effects 0.000 description 13
- 238000005259 measurement Methods 0.000 description 13
- 230000008569 process Effects 0.000 description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 12
- 229910000019 calcium carbonate Inorganic materials 0.000 description 11
- 238000005886 esterification reaction Methods 0.000 description 11
- 125000000524 functional group Chemical group 0.000 description 11
- 239000002904 solvent Substances 0.000 description 10
- 239000000758 substrate Substances 0.000 description 10
- 239000002390 adhesive tape Substances 0.000 description 9
- 230000002829 reductive effect Effects 0.000 description 9
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 8
- 238000003860 storage Methods 0.000 description 8
- 230000003746 surface roughness Effects 0.000 description 8
- 239000003985 ceramic capacitor Substances 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 7
- 238000011109 contamination Methods 0.000 description 7
- 230000006866 deterioration Effects 0.000 description 7
- 150000001875 compounds Chemical class 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- 150000001450 anions Chemical class 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 238000004132 cross linking Methods 0.000 description 5
- 230000032050 esterification Effects 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 239000000314 lubricant Substances 0.000 description 5
- 239000000178 monomer Substances 0.000 description 5
- 239000003960 organic solvent Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229920000728 polyester Polymers 0.000 description 5
- 239000004593 Epoxy Substances 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 150000004010 onium ions Chemical class 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 238000004220 aggregation Methods 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 3
- 239000012298 atmosphere Substances 0.000 description 3
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 3
- 229910002113 barium titanate Inorganic materials 0.000 description 3
- 230000001588 bifunctional effect Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000009835 boiling Methods 0.000 description 3
- 239000007795 chemical reaction product Substances 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 230000000269 nucleophilic effect Effects 0.000 description 3
- 125000000962 organic group Chemical group 0.000 description 3
- 239000008188 pellet Substances 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- 150000003254 radicals Chemical class 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 230000037303 wrinkles Effects 0.000 description 3
- 229920002125 Sokalan® Polymers 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- ADCOVFLJGNWWNZ-UHFFFAOYSA-N antimony trioxide Chemical compound O=[Sb]O[Sb]=O ADCOVFLJGNWWNZ-UHFFFAOYSA-N 0.000 description 2
- 125000004429 atom Chemical group 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
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- 238000001816 cooling Methods 0.000 description 2
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- 125000003566 oxetanyl group Chemical group 0.000 description 2
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- 239000004584 polyacrylic acid Substances 0.000 description 2
- 238000006068 polycondensation reaction Methods 0.000 description 2
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- 230000002441 reversible effect Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- WVLBCYQITXONBZ-UHFFFAOYSA-N trimethyl phosphate Chemical compound COP(=O)(OC)OC WVLBCYQITXONBZ-UHFFFAOYSA-N 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- XBNGYFFABRKICK-UHFFFAOYSA-N 2,3,4,5,6-pentafluorophenol Chemical compound OC1=C(F)C(F)=C(F)C(F)=C1F XBNGYFFABRKICK-UHFFFAOYSA-N 0.000 description 1
- LLLVZDVNHNWSDS-UHFFFAOYSA-N 4-methylidene-3,5-dioxabicyclo[5.2.2]undeca-1(9),7,10-triene-2,6-dione Chemical group C1(C2=CC=C(C(=O)OC(=C)O1)C=C2)=O LLLVZDVNHNWSDS-UHFFFAOYSA-N 0.000 description 1
- FVCSARBUZVPSQF-UHFFFAOYSA-N 5-(2,4-dioxooxolan-3-yl)-7-methyl-3a,4,5,7a-tetrahydro-2-benzofuran-1,3-dione Chemical compound C1C(C(OC2=O)=O)C2C(C)=CC1C1C(=O)COC1=O FVCSARBUZVPSQF-UHFFFAOYSA-N 0.000 description 1
- GZVHEAJQGPRDLQ-UHFFFAOYSA-N 6-phenyl-1,3,5-triazine-2,4-diamine Chemical compound NC1=NC(N)=NC(C=2C=CC=CC=2)=N1 GZVHEAJQGPRDLQ-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 101100029848 Arabidopsis thaliana PIP1-2 gene Proteins 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- 229920002845 Poly(methacrylic acid) Polymers 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 238000003917 TEM image Methods 0.000 description 1
- 238000003848 UV Light-Curing Methods 0.000 description 1
- QYKIQEUNHZKYBP-UHFFFAOYSA-N Vinyl ether Chemical group C=COC=C QYKIQEUNHZKYBP-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- MPIAGWXWVAHQBB-UHFFFAOYSA-N [3-prop-2-enoyloxy-2-[[3-prop-2-enoyloxy-2,2-bis(prop-2-enoyloxymethyl)propoxy]methyl]-2-(prop-2-enoyloxymethyl)propyl] prop-2-enoate Chemical compound C=CC(=O)OCC(COC(=O)C=C)(COC(=O)C=C)COCC(COC(=O)C=C)(COC(=O)C=C)COC(=O)C=C MPIAGWXWVAHQBB-UHFFFAOYSA-N 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000011354 acetal resin Substances 0.000 description 1
- 125000003647 acryloyl group Chemical group O=C([*])C([H])=C([H])[H] 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000007754 air knife coating Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 150000001454 anthracenes Chemical group 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 125000003118 aryl group Chemical group 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
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000010538 cationic polymerization reaction Methods 0.000 description 1
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- 239000012792 core layer Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- OJOSABWCUVCSTQ-UHFFFAOYSA-N cyclohepta-2,4,6-trienylium Chemical compound C1=CC=C[CH+]=C[CH]1 OJOSABWCUVCSTQ-UHFFFAOYSA-N 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
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- 238000007607 die coating method Methods 0.000 description 1
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- 125000006575 electron-withdrawing group Chemical group 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 238000013007 heat curing Methods 0.000 description 1
- 238000009998 heat setting Methods 0.000 description 1
- 229910052588 hydroxylapatite Inorganic materials 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- MGFYSGNNHQQTJW-UHFFFAOYSA-N iodonium Chemical compound [IH2+] MGFYSGNNHQQTJW-UHFFFAOYSA-N 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 239000005001 laminate film Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000004611 light stabiliser Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229940097364 magnesium acetate tetrahydrate Drugs 0.000 description 1
- XKPKPGCRSHFTKM-UHFFFAOYSA-L magnesium;diacetate;tetrahydrate Chemical compound O.O.O.O.[Mg+2].CC([O-])=O.CC([O-])=O XKPKPGCRSHFTKM-UHFFFAOYSA-L 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
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- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- YCWSUKQGVSGXJO-NTUHNPAUSA-N nifuroxazide Chemical group C1=CC(O)=CC=C1C(=O)N\N=C\C1=CC=C([N+]([O-])=O)O1 YCWSUKQGVSGXJO-NTUHNPAUSA-N 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000012788 optical film Substances 0.000 description 1
- 125000002524 organometallic group Chemical group 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- XYJRXVWERLGGKC-UHFFFAOYSA-D pentacalcium;hydroxide;triphosphate Chemical compound [OH-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O XYJRXVWERLGGKC-UHFFFAOYSA-D 0.000 description 1
- IZUPBVBPLAPZRR-UHFFFAOYSA-N pentachloro-phenol Natural products OC1=C(Cl)C(Cl)=C(Cl)C(Cl)=C1Cl IZUPBVBPLAPZRR-UHFFFAOYSA-N 0.000 description 1
- 125000005010 perfluoroalkyl group Chemical group 0.000 description 1
- 239000013500 performance material Substances 0.000 description 1
- 150000002989 phenols Chemical group 0.000 description 1
- 125000004437 phosphorous atom Chemical group 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920006254 polymer film Polymers 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920002215 polytrimethylene terephthalate Polymers 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-O sulfonium Chemical compound [SH3+] RWSOTUBLDIXVET-UHFFFAOYSA-O 0.000 description 1
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- 230000007704 transition Effects 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/042—Coating with two or more layers, where at least one layer of a composition contains a polymer binder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/30—Producing shaped prefabricated articles from the material by applying the material on to a core or other moulding surface to form a layer thereon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- 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
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
Definitions
- the present invention relates to a release film for molding a resin sheet, and more particularly to a release film used when molding an ultra-thin resin sheet.
- a release film which is made of a polyester film as a base material and laminated with a release layer, has been used as a process film for molding resin sheets such as adhesive sheets, cover films, polymer films, and optical lenses.
- the release film is also used as a process film for molding ceramic green sheets that require high smoothness, such as laminated ceramic capacitors and ceramic substrates.
- ceramic green sheets that require high smoothness, such as laminated ceramic capacitors and ceramic substrates.
- a ceramic green sheet is molded by coating a release film with a slurry containing a ceramic component such as barium titanate and a binder resin and drying the slurry. After electrodes are printed on the molded ceramic green sheets and separated from the release film, the ceramic green sheets are laminated, pressed, fired, and external electrodes are applied to manufacture the laminated ceramic capacitor.
- the releasability of the ceramic green sheet from the release film becomes important. If the peel force is large and non-uniform, the ceramic green sheet will be damaged in the peeling process, causing problems such as sheet defects, thickness unevenness, pinholes, sheet cracks, and the like. Therefore, it is also required to peel the ceramic green sheets with a lower and more uniform force.
- Patent Literature 1 proposes a release film having a release layer containing a radical-curable resin as a main component.
- the release film of Patent Document 1 uses a radical-curing resin, when the release layer is processed in the air, it is affected by oxygen inhibition, and the surface of the release layer is poorly cured. I had a problem. If the surface of the release layer is not sufficiently cured, the release layer will be eroded by organic solvents during processing of the ceramic green sheet and printing of the internal electrodes. There is a risk of damaging the seat.
- Patent Document 2 proposes a release layer using a cationic curable resin as a main component. Since the cationic curable resin does not cause oxygen inhibition, even if the release layer is processed in the atmosphere, curing failure does not occur, and a release film having excellent releasability can be obtained.
- the cationic curable resin used in the release film of Patent Document 2 has a slower reaction rate than the radical curable resin, the reaction is not completed only by irradiating the active energy ray, and the polymerization reaction occurs over time. tend to progress. Therefore, when producing a release film using a cationic curable resin, the release layer forming composition is applied to one surface of the base film, and after drying, the release layer forming composition is irradiated with active energy rays. is cured, the cationic polymerization reaction is completed in the state of being wound into a roll and stored, and a release layer having excellent releasability can be formed. Furthermore, the polymerization reaction may not be completed immediately after being wound into a roll and stored, which may affect the surface shape of the release layer. Therefore, it is desirable to be able to further reduce defects in the surface shape of the release layer.
- cationic curable resins tend to cause poor curing due to the influence of water.
- the release film is wound and stored in a roll, so that the release layer and the release surface of the base film are kept in contact with each other. Therefore, there is a problem that the reaction over time of the cationic curable resin is inhibited due to the influence of a small amount of water, which is thought to exist on the anti-release surface side of the base film, and the curing of the release layer becomes insufficient. there were.
- the present invention was made against the background of such problems of the prior art. That is, it is an object of the present invention to provide a release film that suppresses the occurrence of poor curing of a release layer containing a cationic curable resin as a main component and has excellent release properties.
- the release film has a hydrophobized layer on the surface of the base film opposite to the release layer,
- the release layer is a layer formed from a cured product of a composition containing a cationic curable polydimethylsiloxane (a),
- the water contact angle of the hydrophobized layer is 90° or more and 130° or less
- the release layer in the release film obtained by unwinding has a normal peel strength (I) of 1500 mN/50 mm or less.
- the release film roll obtained by winding the release film into a roll has a charge amount of less than ⁇ 1 kV when unwound at 100 m/min.
- the hydrophobized layer is a layer made of a cured product of a composition containing cationic curable polydimethylsiloxane (a).
- the hydrophobic layer has a thickness of 0.001 ⁇ m or more and 0.5 ⁇ m or less.
- the release layer and the hydrophobized layer do not substantially contain particles having a particle size of 1.0 ⁇ m or more.
- the base film is a polyester film having a surface layer A that does not substantially contain inorganic particles having a particle size of 1.0 ⁇ m or more and a surface layer B that contains particles, and on the surface layer A A release layer is laminated on the surface layer B, and a hydrophobized layer is laminated on the surface layer B.
- the release film for molding a resin sheet contains an inorganic compound.
- the resin sheet containing an inorganic compound is a ceramic green sheet.
- the release film for resin sheet molding has a thickness of 0.2 ⁇ m or more and 1.0 ⁇ m or less.
- the release film for resin sheet molding of the present invention has a release layer on one surface of the base film, and the surface opposite to the release layer of the base film (anti-release surface) is hydrophobized.
- the present invention has a base film, a release layer provided on one surface of the base film, and a hydrophobized layer on the surface of the base film opposite to the release layer (anti-release surface). It is a release film for resin sheet molding.
- a hydrophobic layer on the anti-release surface of the base film, the release layer and the hydrophobic layer will come into contact when stored in a roll, so there is no risk of poor curing of the release layer. , a release film having excellent releasability can be obtained.
- the smoothness of the release surface deteriorates due to the unevenness of the release surface that comes into contact with the release surface. can be reduced. Therefore, defects in the surface shape of the release layer that may occur from the production of the release film to the time of use can be further reduced.
- the release layer is preferably a cured product of a composition containing cationic curable polydimethylsiloxane (a), which does not cause poor curing due to oxygen inhibition.
- a cationic curable polydimethylsiloxane
- the hydrophobic layer is preferably a cured product of a composition containing cationic curable polydimethylsiloxane (a).
- the cationic curable polydimethylsiloxane (a) may have the same composition as the cationic curable polydimethylsiloxane (a) contained in the release layer, or may have a different composition. It preferably has the same composition as the cationic curable polydimethylsiloxane (a) contained in the release layer.
- the curable polydimethylsiloxane (a) having the same composition is included, the molecular weight, blending amount, etc. may be appropriately adjusted when used in the hydrophobizing layer.
- the electrification series with the release layer that comes into contact when stored in a roll state is brought closer and electrification is suppressed, so there is no peeling electrification and no defects with a low force.
- the sheet can be peeled off.
- the release surface is hydrophobized, it is possible to suppress the influence of moisture on the release surface when stored in a rolled state, and it is possible to prevent poor curing of the release layer.
- polyester film The polyester constituting the polyester film used as the base film (hereinafter sometimes referred to as the base film) in the present invention is not particularly limited, and the polyester that is commonly used as a release film base is used for film molding. can be used.
- Preferred are crystalline linear saturated polyesters comprising an aromatic dibasic acid component and a diol component, such as polyethylene terephthalate, polyethylene-2,6-naphthalate, polybutylene terephthalate, polytrimethylene terephthalate, or resins thereof. Copolymers based on constituents are more preferred.
- a polyester film made from polyethylene terephthalate is particularly suitable.
- the polyethylene terephthalate preferably contains 90 mol % or more, more preferably 95 mol % or more of repeating units of ethylene terephthalate, and may be copolymerized with other dicarboxylic acid components and diol components in small amounts.
- dicarboxylic acid components and diol components for example, from the viewpoint of cost, one produced only from terephthalic acid and ethylene glycol is preferable.
- known additives such as antioxidants, light stabilizers, ultraviolet absorbers, crystallization agents, etc. may be added within limits that do not impair the effects of the release film of the present invention.
- the polyester film is preferably a biaxially oriented polyester film because of its high bidirectional elastic modulus.
- the intrinsic viscosity of the polyester film is preferably 0.50 to 0.70 dl/g, more preferably 0.52 to 0.62 dl/g.
- the intrinsic viscosity is 0.50 dl/g or more, it is preferable because many breakages do not occur in the stretching process.
- the cutting performance is good when cutting into a predetermined product width, and dimensional defects do not occur, which is preferable.
- the term "polyester film” simply means a (laminated) polyester film having a surface layer A and a surface layer B.
- the method for producing the polyester film in the present invention is not particularly limited, and conventionally commonly used methods can be used.
- the polyester can be melted by an extruder, extruded into a film, cooled by a rotating cooling drum to obtain an unstretched film, and biaxially stretched to obtain the unstretched film.
- the biaxially stretched film can be obtained by a method of sequentially biaxially stretching a longitudinally or laterally uniaxially stretched film in the lateral direction or longitudinal direction, or by a method of simultaneously biaxially stretching an unstretched film in the longitudinal direction and the lateral direction. I can.
- the stretching temperature during stretching of the polyester film is preferably at least the secondary transition point (Tg) of the polyester. It is preferable that the film is stretched 1 to 8 times, particularly 2 to 6 times, in each of the longitudinal and transverse directions.
- the thickness of the polyester film is preferably 12 to 50 ⁇ m, more preferably 15 to 38 ⁇ m, and more preferably 19 to 33 ⁇ m. If the thickness of the film is 12 ⁇ m or more, it is preferable because there is no risk of deformation due to heat during film production, processing, and molding. On the other hand, if the thickness of the film is 50 ⁇ m or less, the amount of the film to be discarded after use is not excessively increased, which is preferable for reducing the environmental load.
- the polyester film substrate may be a single layer or a multilayer of two or more layers.
- the base film may be a polyester film having a surface layer A substantially free of particles with a particle size of 1.0 ⁇ m or more and a surface layer B containing particles.
- the surface layer A does not substantially contain inorganic particles having a particle size of 1.0 ⁇ m or more.
- the surface layer A may contain particles having a particle size of 1 nm or more and less than 1.0 ⁇ m. Since the surface layer A does not substantially contain particles having a particle size of 1.0 ⁇ m or more, such as inorganic particles, it is possible to reduce the occurrence of problems due to transfer of the particle shape in the base material to the resin sheet.
- the surface layer A does not contain particles with a particle size of less than 1.0 ⁇ m, so that it is possible to more effectively suppress the transfer of the particle shape in the base material to the resin sheet.
- the polyester film substrate is preferably a laminated film having a surface layer A substantially free of inorganic particles on at least one side. As a result, it is possible to more effectively suppress the transfer of the particle shapes in the base material to the resin sheet and the occurrence of problems.
- the surface layer A that substantially does not contain particles with a particle size of less than 1.0 ⁇ m substantially does not contain particles with a particle size of 1.0 ⁇ m or more.
- substantially free of particles means, for example, in the case of inorganic particles of less than 1.0 ⁇ m, when the inorganic elements are quantified by fluorescence X-ray analysis, it is 50 ppm or less, preferably 10 ppm. Hereinafter, most preferably, it means a content below the detection limit. Even if particles are not actively added to the film, contaminants derived from foreign substances and dirt adhering to the raw material resin or the lines and equipment in the film manufacturing process peel off and enter the film. This is because Moreover, "substantially free of particles with a particle size of 1.0 ⁇ m or more" means that particles with a particle size of 1.0 ⁇ m or more are intentionally not included.
- a surface layer B capable of containing inorganic particles and the like on the opposite side of the surface layer A which does not substantially contain inorganic particles.
- the layer on the side where the release layer is applied is layer A
- the layer on the opposite side is layer B
- the core layer other than these is layer C.
- the layer configuration in the thickness direction is release layer / A / B, or a laminated structure such as release layer/A/C/B.
- the C layer may have a multi-layer structure.
- the surface layer B may not contain inorganic particles. In that case, it is preferable to provide a coating layer containing at least inorganic particles and a binder on the surface layer B in order to impart lubricity for winding the film into a roll.
- the surface layer B which forms the surface opposite to the surface to which the release layer is applied, preferably contains inorganic particles from the viewpoint of film slipperiness and ease of air release.
- inorganic particles from the viewpoint of film slipperiness and ease of air release.
- silica particles and/or calcium carbonate particles are preferably used.
- the content of the inorganic particles contained in the surface layer B is preferably 5000 to 15000 ppm in total of the inorganic particles.
- the area average surface roughness (Sa) of the film of the surface layer B is preferably in the range of 1 to 40 nm. More preferably, it is in the range of 5 to 35 nm.
- the total amount of silica particles and/or calcium carbonate particles is 5000 ppm or more and Sa is 1 nm or more, when the film is wound into a roll, air can be released uniformly, resulting in a good roll shape and good flatness. , suitable for the production of ultra-thin ceramic green sheets.
- the total amount of silica particles and/or calcium carbonate particles is 15000 ppm or less and Sa is 40 nm or less, aggregation of the lubricant is difficult to occur and coarse protrusions cannot be formed, so that the quality is stable when manufacturing an ultra-thin ceramic green sheet. and preferred.
- inactive inorganic particles and/or heat-resistant organic particles can be used in addition to silica and/or calcium carbonate. More preferably, calcium carbonate particles are used. Inorganic particles that can also be used include alumina-silica composite oxide particles, hydroxyapatite particles, and the like. Examples of heat-resistant organic particles include crosslinked polyacrylic particles, crosslinked polystyrene particles, and benzoguanamine particles. When silica particles are used, porous colloidal silica is preferable, and when calcium carbonate particles are used, light calcium carbonate surface-treated with a polyacrylic acid-based polymer compound is preferable from the viewpoint of preventing the lubricant from falling off. .
- the average particle size of the inorganic particles added to the surface layer B is preferably 0.1 ⁇ m or more and 2.0 ⁇ m or less, and particularly preferably 0.5 ⁇ m or more and 1.0 ⁇ m or less. If the average particle size of the inorganic particles is 0.1 ⁇ m or more, the slipperiness of the release film is good, which is preferable. Further, when the average particle size is 2.0 ⁇ m or less, there is no fear of adversely affecting the smoothness of the surface of the release layer, and thus there is no fear of generating pinholes in the ceramic green sheet, which is preferable.
- the surface layer A which is the layer on which the release layer is provided, in order to prevent contamination of inorganic particles such as lubricants.
- the thickness ratio of the surface layer A which is the layer on which the release layer is provided, is preferably 20% or more and 50% or less of the total layer thickness of the base film. If it is 20% or more, the inside of the film is less likely to be affected by the particles contained in the surface layer B, etc., and it is easy for the region surface average roughness Sa to satisfy the above range, which is preferable.
- the total thickness of the base film is 50% or less of the total thickness of the base film, the ratio of the recycled raw material used in the surface layer B can be increased, and the environmental load is small, which is preferable.
- a film before stretching or after uniaxial stretching is applied to the surface of the surface layer A and / or surface layer B in the film forming process.
- a coat layer may be provided on the surface, and corona treatment or the like may be applied.
- the release layer is formed on one side of the base film.
- a base film having a surface layer A containing substantially no inorganic particles it is preferable to form a release layer on the surface layer A.
- the release layer is a cured product of a composition containing cationic curable polydimethylsiloxane (a).
- a cationic curable polydimethylsiloxane
- the present invention having such effects can improve the solvent resistance of the release layer surface, for example.
- By improving the solvent resistance of the release layer surface it is possible to suppress the release layer from being eroded by the organic solvent used when molding the ceramic green sheet and when printing the internal electrodes, and it is possible to have high peelability. can.
- cationic curable polydimethylsiloxane is cured by active energy rays, high heat of 130° C. or higher is not required for the curing reaction. Therefore, it is possible to suppress deterioration of the flatness of the release film due to heat during processing. As a result, it is possible to suppress foreign matter from entering the release film for resin sheet molding and the occurrence of scratches on the release layer. can be suppressed.
- the degree of cure of the release layer can be evaluated by setting the ratio between the normal peel strength (I) and the peel strength after heating (II) of the release layer according to the present invention under a predetermined condition.
- the release film may be heated when a resin sheet typified by a ceramic green sheet is molded on the release film or when the release film is peeled off.
- the peel strength under normal conditions (I) and the peel strength after heating (II) in the present invention are within a predetermined range, stable holding and peelability of the ceramic green sheet can be exhibited before and after heating.
- the ratio of normal peel strength (I) to peel strength after heating (II), (II)/(I), is 1.00 or more and 1.50 or less, more preferably 1.00 or more and 1.45 or less. .
- it may be 1.00 or more and 1.40 or less.
- it may be 1.05 or more, or 1.10 or more.
- the ratio (II)/(I) of the normal peel strength (I) and the peel strength after heating (II) is 1.50 or less, it means that the curing of the release layer progresses sufficiently and there is little unreacted material. It is preferable because it has excellent releasability from a resin sheet such as a ceramic green sheet. Since the post-heating peel strength is generally higher than the normal peel strength, it is preferably 1.00 or more. A detailed evaluation method will be described later.
- the release film for resin sheet molding is wound once in a roll, and then the release film obtained by unwinding is measured. ), it is possible to indirectly evaluate the degree of progress of the polymerization reaction of the release layer that progresses over time.
- the release layer can be stored in a roll so that the reaction of the release layer can be further promoted, the release force is stable, and the release layer can be obtained while maintaining an excellent surface shape. It is possible to obtain a release film having excellent peeling force after heating.
- the ratio (II)/(I) of the normal peel strength (I) and the peel strength after heating (II) is 1.50 or less and 1.00 or more
- the conventional Influence on the surface shape of the release layer can be reduced and high smoothness can be maintained even better than the release film.
- curing of the release layer has progressed sufficiently, blocking is unlikely to occur in the roll state, and the unwinding electrification amount can be suppressed.
- the release layer does not substantially contain particles with a particle size of 1.0 ⁇ m or more.
- particles having a particle size of less than 1.0 ⁇ m and 1 nm or more may be present in the release layer. Since the release layer does not substantially contain inorganic particles having a particle size of 1.0 ⁇ m or more, it is possible to suppress the occurrence of pinholes in an ultra-thin resin sheet that requires high smoothness, such as a ceramic green sheet. A resin sheet having a uniform film thickness can be formed.
- the release layer preferably has high smoothness, the surface layer A substantially free of inorganic particles, specifically particles having a particle size of less than 1.0 ⁇ m, It is preferable to provide the release layer according to the present invention on the substrate film having the surface layer A, which preferably contains substantially no particles.
- the release layer does not substantially contain particles with a particle size of less than 1.0 ⁇ m and does not substantially contain particles with a particle size of 1.0 ⁇ m or more.
- the release layer has a regional surface roughness Sa of 7 nm or less and a maximum projection height of 50 nm or less.
- the release layer has such characteristics, it is possible to suppress the occurrence of pinholes in an ultra-thin resin sheet that requires high smoothness, such as a ceramic green sheet, and to form a resin sheet with a uniform thickness. .
- the release layer has a region surface average roughness (Sa) of 7 nm or less and a maximum protrusion height (Sp) of 50 nm or less.
- the film surface on which the release layer is formed has the above average surface roughness and maximum protrusion height in order not to cause defects in the ceramic green sheet coated and molded thereon. If the surface roughness of the region is 7 nm or less and the maximum protrusion height is 50 nm or less, defects such as pinholes do not occur when the ceramic green sheets are formed, and the yield is good, which is preferable.
- the release film of the present invention has a release layer according to the present invention and a hydrophobic layer, so that it has excellent peelability from the resin sheet, and furthermore, when the resin sheet is wound and stored In addition, the occurrence of pinholes, wrinkles and misalignment can be suppressed. In addition, the present invention can suppress the unwinding charge from increasing. As described above, the release film of the present invention can not only produce a resin sheet satisfactorily due to its high smoothness and excellent releasability, but also can improve the handling property during film winding and transportation. Contamination of foreign matter can be reduced by suppressing emergence charging.
- the release layer has an average regional surface roughness (Sa) of 5 nm or less and a maximum protrusion height (Sp) of 30 nm or less.
- the lower the maximum protrusion height the better.
- the region surface average roughness (Sa) may be 3 nm or less, and may be, for example, less than 2 nm.
- the maximum projection height (Sp) is preferably as small as possible, and may be 1 nm or more, or 3 nm or more.
- the maximum protrusion height (Sp) may be 25 nm or less, or may be 20 nm or less.
- the release layer is preferably a cured product of a composition containing at least cationic curable polydimethylsiloxane (a).
- cation-curable polydimethylsiloxane (a) refers to polydimethylsiloxane having a cation-curable functional group.
- the cationic curable functional group is a reactive functional group exhibiting cationic curability, and specific examples thereof include a vinyl ether group, an oxetanyl group, an epoxy group, and an alicyclic epoxy group.
- the release layer has excellent solvent resistance and excellent releasability.
- the viscosity of the cationic curable polydimethylsiloxane (a) is preferably 100 mPa s or more and 10000 mPa s or less, more preferably 100 mPa s or more and 5000 mPa s or less, and 100 mPa s or more and 1000 mPa s or less. It is even more preferable to have When it is 100 mPa ⁇ s or more, the amount of unreacted components after storage in a roll state is small, and a sufficiently cured release layer can be obtained, which is preferable. When it is 10000 mPa ⁇ s or less, it is preferable because it exhibits solubility in the organic solvent contained in the release layer-forming composition and can be applied uniformly.
- the viscosity in the present invention is a value measured in an atmosphere of 25°C.
- the cationic curable polydimethylsiloxane (a) may have one or more cationic curable functional groups.
- having two or more cationic curing functional groups facilitates the progress of the cationic curing reaction, resulting in a release layer with a high crosslink density, which is preferable.
- the introduction position of the cationic curable functional group is not particularly limited, and it is common to have it at the side chain or end of polydimethylsiloxane.
- the structure of polydimethylsiloxane may be either a linear structure or a branched structure, and even if it has a functional group other than the cationic curable functional group, it can be used without any problem.
- cationic curable polydimethylsiloxane examples include silicone lease (registered trademark) UV POLY200, UV POLY201, UV POLY215, UV RCA200, UV RCA251 manufactured by Arakawa Chemical Industries, Ltd., X-62-7622, X-62-7629, X-62-7622 manufactured by Shin-Etsu Chemical Co., Ltd. 62-7660, KF-101, KF-105, X-22-343, X-22-169AS, X-22-169B, X-22-163, X-22-173BX, X-22-173DX, X- 22-9002, and UV9440E and UV9430 manufactured by Momentive Performance Materials.
- the release layer-forming composition of the present invention may contain other resins in addition to the cationic curable polydimethylsiloxane (a).
- a release layer is provided on the surface layer A of the substrate film that does not substantially contain inorganic particles, a cured release layer containing cationic curable polydimethylsiloxane (a) as a main component is preferred.
- the release layer can have extremely high smoothness, which is preferable.
- the film thickness of the release layer is thin, the curing reaction proceeds easily, processing can be performed at a higher speed, and the release layer can be obtained economically.
- the thickness of the release layer is preferably 0.001 ⁇ m or more and less than 0.050 ⁇ m.
- the thickness is 0.001 ⁇ m or more, the releasability is excellent, which is preferable.
- the thickness is less than 0.050 ⁇ m, aggregation of the release layer-forming composition can be prevented, and a smooth release layer can be obtained, which is preferable.
- the composition when the cationic curable polydimethylsiloxane (a) is the main component, the composition contains the cationically curable polydimethylsiloxane (a) with respect to 100 parts by mass of the resin solid content of the release layer. It contains at least 50 parts by weight, such as more than 50 parts by weight, preferably 70 parts by weight or more, such as 80 parts by weight or more, and in one embodiment, 90 parts by weight or more. In addition, substantially all of the solid resin content of the release layer may contain the cationic curable polydimethylsiloxane (a).
- the release layer-forming composition of the present invention may contain a cationic curable resin (b) having no silicone skeleton in addition to the cationically curable polydimethylsiloxane (a). At this time, (b) is a different resin from (a), and resin (b) does not have a polydimethylsiloxane structure.
- the release layer-forming composition further contains a cationic curable resin (b) having no silicone skeleton in addition to the cationically curable polydimethylsiloxane (a).
- a cationic curable resin (b) having no silicone skeleton include polymers and monomers having two or more cationic curable functional groups in the molecule and having no silicone skeleton. Among them, resins having two or more epoxy groups or alicyclic epoxy groups are preferred, and those having two or more alicyclic epoxy groups are more preferred. For example, the number of alicyclic epoxy groups may be 6 or less.
- a cross-linking reaction proceeds by a cationic curing reaction, resulting in a release layer having excellent solvent resistance.
- a cross-linking reaction also proceeds with the polydimethylsiloxane (a) contained in the release layer, which is preferable because it is excellent in releasability and suppresses migration of the polydimethylsiloxane (a) to the ceramic green sheet.
- the release layer-forming composition contains both the cationic curable resin (b) having no silicone skeleton and the polydimethylsiloxane (a), so that a release layer having high smoothness can be realized. .
- the release layer containing the resin (b) it is possible to fill fine unevenness, extremely small foreign matter, and projections derived from oligomers existing in the base film, resulting in an ultra-smooth release layer.
- the release layer has high smoothness.
- the polydimethylsiloxane (a) contained at the same time segregates on the surface of the release layer in the drying process, so that a release layer having excellent releasability can be obtained.
- the cationically curable resin (b) that does not have a silicone skeleton is preferably a low molecular weight monomer.
- the number average molecular weight is preferably 200 or more and less than 5,000, more preferably 200 or more and less than 2,500, and even more preferably 200 or more and less than 1,000.
- the number average molecular weight is 200 or more, the boiling point is not lowered, and the cationic curable resin (b) is not likely to volatilize during the process of drying the release layer forming composition, which is preferable.
- it is less than 5,000 the cross-linking density of the release layer is increased and the solvent resistance is excellent, which is preferable.
- it since it can exist in a liquid state with fluidity during the drying process, it is excellent in leveling properties and forms an ultra-smooth release layer, which is preferable.
- cationic curable resin (b) that does not have a silicone skeleton.
- examples of compounds having an alicyclic epoxy group include Celoxide 2021P, Celloxide 2081, Epolead GT401 and EHPE3150 manufactured by Daicel Corporation, HiREM-1 manufactured by Shikoku Kasei Co., Ltd., THI-DE, DE-102 and DE manufactured by ENEOS. -103 and so on.
- resins having epoxy groups include DIC's EPICLON® 830, 840, 850, 1051-75M, N-665, N-670, N-690, N-673-80M, N-690- 75M, Denacol (registered trademark) EX-611, EX-313, EX-321 manufactured by Nagase Chemtech Co., Ltd., and the like.
- the release layer contains the cationic curable resin (b) that does not have a silicone skeleton
- the cationic curable polydimethylsiloxane (a) and the cationic curable resin (b) in the release layer of 100 parts by mass in total
- the content of the cationic curable resin (b) having no silicone skeleton may exceed 50 parts by mass, preferably 80% by mass or more, more preferably 85% by mass or more, and 90% by mass. % or more is more preferable.
- the content of the cationic curable resin (b) is more than 50 parts by mass, for example, 80% by mass or more, and by making it the main component in the release layer, the release layer has a high crosslink density and excellent peelability. preferable.
- the content of the cationic curable polydimethylsiloxane (a) contained in the release layer can be reduced, and the aggregation of the polydimethylsiloxane (a)-derived composition on the surface of the release layer during the drying process can be suppressed. It is preferable because there is no risk of deteriorating flatness.
- the higher the content of the cationic curable resin (b), the more excellent the smoothness of the release layer. b) is preferably 99.9% by mass or less.
- a compound (cured product) derived from the cationic curable resin (b) having no silicone skeleton is present in the release layer obtained by curing the release layer-forming composition.
- the compound derived from (b) present in the release layer may also be simply referred to as the cationic curable resin (b) having no silicone skeleton.
- the release layer-forming composition contains the cation-curable polydimethylsiloxane (a) and the cation-curable resin (b), the release layer has a high cross-linking density, excellent solvent resistance, and excellent release force. It is preferable because it becomes a mold layer.
- the thickness of the release layer is preferably 0.01 ⁇ m or more and 1.0 ⁇ m or less, It is more preferably 0.05 ⁇ m or more and 0.5 ⁇ m or less. A thickness of 0.01 ⁇ m or more is preferable because a smooth release layer can be obtained. When the thickness is 1.0 ⁇ m or less, a release film having excellent flatness without curling can be obtained, which is preferable.
- the release layer-forming composition preferably contains an acid generator (c).
- a compound derived from the acid generator (c) may be present in the release layer.
- the compound derived from the acid generator (c) present in the release layer may also be simply referred to as the acid generator (c).
- the acid generator There are no particular restrictions on the acid generator, and a common one can be used, but by using a photoacid generator that generates acid under ultraviolet irradiation, it is possible to reduce the amount of heat during processing and achieve excellent flatness. It is preferable because it becomes a release layer.
- a salt composed of an onium ion and a non-nucleophilic anion as the photoacid generator.
- an organometallic complex typified by an iron arene complex or a carbocation salt typified by tropylium may be used, and an anthracene derivative or a phenol substituted with an electron-withdrawing group such as pentafluorophenol may also be used.
- onium ions that can be used include iodonium, sulfonium, and ammonium.
- organic group of the onium ion triaryl, diaryl (monoalkyl), monoaryl (dialkyl), trialkyl may be used, and benzophenone or 9-fluorene may be introduced, or other organic groups may be used. good.
- hexafluorophosphate hexafluoroantimonate, hexafluoroborate, and tetra(pentafluorophenyl)borate are preferably used.
- tetra(pentafluorophenyl)gallium ions anions in which some fluorine anions are replaced with perfluoroalkyl groups or organic groups, or other anion components may be used.
- the amount of the photoacid generator added is 0.1 to 10% by mass with respect to a total of 100 parts by mass of the cationic curable polydimethylsiloxane (a) and the cationic curable resin (b) in the release layer, and more preferably. is 0.5 to 8% by mass. More preferably, it is 1 to 5% by mass. A content of 0.1% by mass or more is preferable because there is no risk of insufficient curing due to an insufficient amount of generated acid. In addition, when the amount is 10% by mass or less, the amount of generated acid becomes appropriate, and the amount of acid transferred to the ceramic green sheet to be molded can be suppressed, which is preferable.
- the total 100 parts by mass of the cationic curable polydimethylsiloxane (a) and the cationic curable resin (b) in the release layer means the solid content of the cationic curable polydimethylsiloxane (a), the cationic curable It means the total solid content of resin (b).
- the weight of the cation-curable polydimethylsiloxane (a) corresponds to 100 parts by mass of the resin solid content in the release layer.
- the release layer may contain an adhesion improver, an additive such as an antistatic agent, etc., as long as the effects of the present invention are not impaired, but it is preferable not to contain particles. . Since the release layer does not contain particles, deterioration of smoothness of the surface of the release layer and contamination of the resin sheet with particles due to falling off of the particles can be suppressed.
- the surface of the polyester film may be subjected to pretreatment such as anchor coating, corona treatment, plasma treatment, atmospheric pressure plasma treatment, etc. before the release coating layer is provided.
- the hydrophobic layer is formed on the surface of the substrate film opposite to the surface provided with the release layer.
- a hydrophobic layer is formed on the surface layer B on the other side of the base film. It is formed.
- the hydrophobic layer does not substantially contain particles with a particle size of 1.0 ⁇ m or more. In this embodiment, particles having a particle size of less than 1.0 ⁇ m and greater than or equal to 1 nm may be present in the hydrophobized layer.
- the release layer does not substantially contain inorganic particles with a particle size of 1.0 ⁇ m or more, when the release film is wound into a roll, the number of particles present on the release surface (hydrophobized layer) is reduced. It is preferable because there is no fear of deforming (defecting) the resin sheet.
- the hydrophobized layer preferably does not substantially contain particles with a particle size of less than 1.0 ⁇ m, and preferably contains no particles. By substantially not containing particles with a particle size of less than 1.0 ⁇ m, when the resin sheet is stored in a roll after being molded on a release film, the shape of the particles in the hydrophobic layer is transferred to the resin sheet. is preferable because there is no fear of deformation.
- the particles in the hydrophobized layer will fall off and be mixed into the resin sheet.
- the above effect can be exhibited more favorably.
- the surface layer A that substantially does not contain particles with a particle size of less than 1.0 ⁇ m substantially does not contain particles with a particle size of 1.0 ⁇ m or more.
- such an aspect is the same as an aspect having substantially no particles.
- the hydrophobized layer is preferably a cured product of a composition containing cationic curable polydimethylsiloxane (a). Because the hydrophobic layer has such characteristics, when the release film is rolled up and stored, the release layer and the hydrophobic layer are in contact with each other, so the release layer is hardened by moisture. This is preferable because the reaction proceeds without being affected by inhibition. In addition, since the release layer also contains the cationically curable polydimethylsiloxane (a), the electrification series with the release layer that comes into contact with the release layer when stored in a roll state is brought closer, and charging is suppressed, which is preferable.
- a resin sheet such as a ceramic green sheet can be peeled off with a low force without causing peeling electrification and without defects.
- the release film of the present invention can suppress electrification and prevent contamination of the release layer even in the process of unwinding the roll before molding the resin sheet.
- unwinding electrification can be suppressed, so that various effects described in this specification can be achieved.
- the water contact angle of the hydrophobized layer of the present invention is 90° or more and 130° or less. By setting the water contact angle within this range, it is possible to reduce the amount of water that is thought to be adsorbed on the release surface of the base film, and this is preferable because there is no risk of inhibiting the curing of the release layer that comes into contact in the roll state.
- the hydrophobized layer may have a water contact angle of 95° or more and 130° or less, such as 98° or more and 130° or less.
- the water contact angle of the hydrophobized layer is within the above range, and the hydrophobized layer contains the cationic curable polydimethylsiloxane (a) contained in the release layer.
- the hydrophobized layer in the present invention may be a cured product of a composition containing cationic curable resin (b) having no silicone skeleton in addition to cationically curable polydimethylsiloxane (a).
- the elastic modulus of the hydrophobized layer can be improved by using the cationic curable resin (b).
- a hydrophobized layer having a high elastic modulus is preferable because it not only improves the handleability of the release film but also suppresses unwinding electrification.
- the elastic modulus of the hydrophobized layer is increased, the lubricity between the release layer and the hydrophobized layer, which are in contact with each other during roll storage, is improved (easily slippery).
- the cationic curable polydimethylsiloxane (a) and cationic curable resin (b) that form the hydrophobic layer the same examples as those usable in the release layer described above can be used.
- the composition of the release layer and the hydrophobic layer need not be exactly the same, and the effect of the present invention can be obtained as long as both the release layer and the hydrophobic layer contain the cationic curable polydimethylsiloxane (a). It is possible to obtain a release film having.
- the film thickness of the hydrophobized layer is preferably 0.001 ⁇ m or more and 0.050 ⁇ m or less.
- the thickness is 0.001 ⁇ m or more, the effect of suppressing inhibition of hardening of the release layer in contact with the hydrophobized layer is sufficient, which is preferable.
- the thickness is 0.050 ⁇ m or less, the elastic modulus of the hydrophobized layer is lowered, and it is possible to prevent an increase in unwinding electrification and the occurrence of blocking in a roll state, which is preferable.
- the hydrophobized layer is made of a cured product of a composition containing cationic curable polydimethylsiloxane (a) and cationic curable resin (b) having no silicone skeleton, a total of 100 parts by mass has a silicone skeleton.
- the content of the cationically curable resin (b) that does not contain the free radical is preferably 80% by mass or more, more preferably 85% by mass or more, and even more preferably 90% by mass or more.
- the film thickness of the hydrophobic layer at this time is preferably 0.001 ⁇ m to 0.5 ⁇ m, more preferably 0.001 ⁇ m to 0.3 ⁇ m. If the film thickness of the hydrophobized layer is 0.001 ⁇ m, the effect of suppressing inhibition of hardening of the release layer and the effect of suppressing electrification are sufficient, which is preferable. If the thickness is 0.5 ⁇ m or less, the unevenness on the side of the anti-separation mold is not completely filled, the transportability is excellent, and blocking does not occur when the film is wound up, which is preferable.
- the surface of the hydrophobic layer is preferably rougher than the surface of the release layer.
- the surface of the hydrophobic layer is rougher than that of the release layer, the transportability and winding property of the roll are improved, and it is possible to prevent scratches, contamination with foreign substances, and increase in unwinding electrification, which is preferable.
- the desired effect can be obtained if the surface roughness Sa of the hydrophobic layer is larger than the surface roughness of the release layer.
- Sa is preferably in the range of 1 to 40 nm, more preferably in the range of 2 to 30 nm. and more preferably in the range of 3 to 20 nm.
- the thickness is 40 nm or less, the surface shape of the hydrophobized layer is transferred to the resin sheet, which is preferable because there is no possibility of causing problems.
- the hydrophobized layer-forming composition preferably contains an acid generator (c).
- the amount and type of acid generator to be used are the same as those for the release layer described above.
- the hydrophobized layer can contain an acid generator (c) as long as the water contact angle does not deviate from the scope of the present invention. Even if the composition for forming the release layer and the composition for forming the hydrophobized layer contain the same type of resin, the amount of solvent contained in each composition may be different. Therefore, it is not easy to identify the structure of the obtained polymer and to specify the claim based on it, and there are impractical circumstances.
- the release layer-forming composition for forming the release layer is preferably applied by an in-line method during the production process of the polyester film or an off-line method after the production of the polyester film.
- an in-line method a coating solution in which a release resin is dissolved or dispersed is applied to a film stretched in the film flow direction (longitudinal direction) and uniaxially oriented, and then in the horizontal direction (the film flow direction is A method of stretching in the perpendicular direction) to biaxially orient the film and forming a release layer at the same time is preferred.
- a coating solution in which a release resin is dissolved or dispersed is applied to one surface of the biaxially oriented polyester film, and after removing the solvent etc. by drying, heat drying, heat curing or A UV curing method is used.
- a water-based coating liquid as the coating liquid for the in-line coating.
- a water-soluble organic solvent such as alcohol.
- the coating liquid used in off-line coating but it is preferable to use an organic solvent, and it is preferable to add a solvent having a boiling point of 90° C. or higher.
- the method of forming the hydrophobic layer is not particularly limited, but it can be processed by a method of processing both sides at the same time as the release layer, or a method of processing one side and then processing the opposite side. In the latter case, it is preferable to process the hydrophobic layer after processing the release layer. This is because the release layer is required to be smoother than the hydrophobic layer because the resin sheet is directly laminated thereon. Therefore, it is preferable to process the hydrophobic layer first, because the slipperiness of the back surface is good, wrinkles are less likely to occur during processing of the release layer, and more uniform coating can be achieved.
- the hydrophobized layer it is preferable to process the hydrophobized layer not by the in-line method of coating during polyester film formation, but by the off-line method of processing after polyester film formation.
- the off-line method is superior in handling during processing because the tension during coating and winding can be controlled at a high level.
- any known coating method can be applied.
- a conventionally known method such as a coating method, a die coating method, a spray coating method, an air knife coating method can be used.
- the base film is conveyed roll-to-roll during processing of the release layer and processing of the hydrophobic layer. Therefore, after processing the release layer and the hydrophobic layer, the release film is wound into a roll and stored. Further, molding of the resin sheet and peeling of the resin sheet are also performed by roll-to-roll.
- the tension when winding the release film into a roll is preferably 10 N/m to 300 N/m.
- a winding tension of 10 N/m or more is preferable because there is no winding deviation.
- a winding tension of 300 N/m or less is preferable because there is no risk of deformation of the release film due to tight winding or blocking.
- the touch pressure of the touch roll is preferably 100 to 3000 N/m. If it is 100 N/m or more, it is possible to reduce accompanying air that is mixed in during winding, and it is preferable because it is possible to suppress the occurrence of winding misalignment. If it is 3000 N/m or less, deformation of the release film due to the touch roll pressure is suppressed, and a release film having excellent flatness is obtained, which is preferable.
- the unwinding charge amount when the release film stored in a roll state is unwound can be kept low. It is preferable that the charge amount when the release film wound into a roll is unwound at 100 m/min is less than ⁇ 1.0 kV. When it is less than ⁇ 1.0, there is no possibility that very small foreign matters during the process will adhere to the release film, which is preferable. In addition, it is preferable because the peeling electrification when peeling the resin sheet can be kept low, and the peeling can be performed with a lower and uniform force.
- the storage environment in the roll state it can be stored without any particular restrictions as long as it is indoors in a cool place that avoids direct sunlight and high temperatures. It may be stored in a humidity-controlled environment or a temperature-controlled storage place, and the effects of the present invention can be obtained as long as the humidity is in the range of 20RH% to 90RH% and the temperature is in the range of -5°C to 50°C.
- the release force in the present invention is measured by storing a release film provided with a release layer and a hydrophobic layer in a roll state in an environment of 40 to 50 RH% and 20 to 25 ° C. for 3 days, and then winding the release film roll. It is a value measured using a release film taken out and sampled. After providing the hydrophobized layer, the film is stored in a roll to complete the reaction of the release layer and to obtain a release film having excellent release force.
- the peel strength in the present invention is a value measured by laminating an adhesive tape (“31B” manufactured by Nitto Denko Corporation) on the surface of the release film and performing T-type peeling at a pulling speed of 300 m/min. A detailed evaluation method will be described later.
- the normal peel strength (I) of the release layer is preferably 100 mN/50 mm or more and 1500 mN/50 mm or less, more preferably 100 mN/50 mm or more and 1300 mN/50 mm or less, and 100 mN/50 mm or more and 1000 mN/ It is more preferably 50 mm or less. If it is 100 N/50 mm or more, there is no possibility that the resin sheet will partially float or come off during transportation, and the retention is excellent, which is preferable. If it is 1500 mN/50 mm or less, the resin sheet can be peeled without damage, which is preferable.
- the post-heating peel strength (II) of the release layer is preferably 150 mN/50 mm or more and 2250 mN/50 mm or less, more preferably 150 mN/50 mm or more and 1950 mN/50 mm or less, and 150 mN/50 mm or more and 1500 mN. /50 mm or less is more preferable. Since heat is applied to the release film when the resin sheet is molded on the release film or when the resin sheet is peeled off, the peelability of the release film can be evaluated in more detail based on the peel force after heating. It is preferable that it is 150 mN/50 mm or more because the retention of the ceramic green sheet is excellent.
- the release layer contains the cationic curable polydimethylsiloxane (a), and the hydrophobized layer has a water contact angle of 90 ° or more and 130 °
- the post-heating peel strength (II) can be brought within the above range. It can be held, and the obtained resin sheet can be easily peeled off. Therefore, in the present invention, retention of the resin sheet-forming composition and peeling after heating can be maintained in a well-balanced manner. For example, even in a mode in which the ceramic green sheet has an extremely thin thickness of 1.0 ⁇ m or less, these effects can be obtained.
- the ratio of normal peel strength (I) to peel strength after heating (II): (II)/(I) is preferably 1.00 or more and 1.50 or less.
- the fact that the ratio of normal peel strength (I) to peel strength after heating (II): (II)/(I) is large suggests that unreacted substances remain in the release layer. means that the curing of has not progressed completely. If (II)/(I) is 1.50 or less, the release layer is in contact with the hydrophobized layer during storage in a rolled state. Preferable because it progresses perfectly. Since the post-heating peel strength (II) generally exhibits a larger value than the normal peel strength (I), (I)/(II) is preferably 1.0 or more.
- the release film of the present invention is not particularly limited as long as it is a resin sheet, and may be applied to the production of adhesives and optical films.
- the present invention is a release film for molding a resin sheet containing an inorganic compound.
- inorganic compounds include metal particles, metal oxides, and minerals, such as calcium carbonate, silica particles, aluminum particles, and barium titanate particles.
- resins include polyvinyl acetal resins and poly(meth)acrylic acid ester resins.
- the present invention has a release layer with high smoothness and a back layer with excellent smoothness, handling properties, and antistatic properties, even if the resin sheet contains these inorganic compounds, Defects to be obtained, such as breakage of the resin sheet and difficulty in peeling the resin sheet from the release layer, can be suppressed.
- the resin component forming the resin sheet can be appropriately selected depending on the application.
- the resin sheet containing the inorganic compound is a ceramic green sheet.
- the ceramic green sheets can contain barium titanate as the inorganic compound.
- the resin sheet has a thickness of 0.2 ⁇ m or more and 1.0 ⁇ m or less.
- a multilayer ceramic capacitor has a rectangular parallelepiped ceramic body. Inside the ceramic body, first internal electrodes and second internal electrodes are alternately provided along the thickness direction. The first internal electrode is exposed on the first end face of the ceramic body. A first external electrode is provided on the first end surface. The first internal electrode is electrically connected to the first external electrode at the first end surface. The second internal electrode is exposed on the second end face of the ceramic body. A second external electrode is provided on the second end surface. The second internal electrode is electrically connected to the second external electrode at the second end surface.
- the release film of the present invention is a release film for producing ceramic green sheets, and is used for producing such a laminated ceramic capacitor.
- a ceramic green sheet manufacturing method for molding a ceramic green sheet using the release film for manufacturing a ceramic green sheet of the present invention can mold a ceramic green sheet having a thickness of 0.2 ⁇ m to 1.0 ⁇ m.
- a ceramic green sheet is manufactured as follows. First, using the release film of the present invention as a carrier film, a ceramic slurry for forming a ceramic body is applied and dried. As for the thickness of the ceramic green sheet, an ultra-thin product with a thickness of 0.2 to 1.0 ⁇ m is required.
- a conductive layer for forming the first or second internal electrode is printed on the coated and dried ceramic green sheet.
- Ceramic green sheets, ceramic green sheets printed with conductive layers for forming first internal electrodes, and ceramic green sheets printed with conductive layers for forming second internal electrodes are appropriately laminated and pressed.
- a mother laminate is obtained.
- the mother laminate is divided into a plurality of pieces to produce raw ceramic bodies.
- a ceramic body is obtained by firing a raw ceramic body. After that, the multilayer ceramic capacitor can be completed by forming the first and second external electrodes.
- the cut release film was embedded in a resin and cut into ultrathin slices using an ultramicrotome. After that, cross-sectional observation was performed using a JEOL JEM2100 transmission electron microscope, and the film thickness of the release layer was measured from the observed TEM image. When the thickness was too thin to be evaluated accurately by cross-sectional observation, it was measured using a reflection spectroscopic film thickness meter (manufactured by Otsuka Electronics Co., Ltd., FE-3000).
- the release film for resin sheet production obtained in each example and each comparative example was rolled up into a roll having a width of 400 mm and a length of 6000 m to obtain a release film roll. At this time, the winding tension was 150 N/mm, and the touch roll pressure was 700 N/m.
- the obtained film roll was stored in an environment of 20 to 25° C. and humidity of 40 to 50 RH% for 3 days and then unwound to obtain a release film for measurement.
- An adhesive tape (“31B” manufactured by Nitto Denko Corporation) was attached to the surface of the release layer of the release film for measurement, and the release film with the adhesive tape was cut into strips having a width of 25 mm and a length of 150 mm.
- the cut release film with adhesive tape was pressed with a pressure roller of 5 kg, and then left under conditions of a temperature of 22° C. and a humidity of 60% for 20 hours. After that, one end of the adhesive tape was fixed, one end of the release film was held, and the release film side was pulled at a speed of 300 mm/min, and measured by T-type peeling. For the measurement, a tensile tester ("AUTOGRAPHAG-X" manufactured by Shimadzu Corporation) was used.
- a release film for evaluation was collected in the same manner as for the normal peel strength (I), and an adhesive tape (manufactured by Nitto Denko Co., Ltd., trade name “31B”) was attached to the surface of the release layer.
- the release film with adhesive tape was cut into strips of 150 mm.
- the cut release film with adhesive tape was pressed with a pressure roller of 5 kg, and then heated in an oven at a temperature of 70° C. for 20 hours. After that, one end of the adhesive tape was fixed, one end of the release film was gripped, and the release film side was pulled at a speed of 300 mm/min to be peeled off, and measurement was performed by T-type peeling.
- a tensile tester (“AUTOGRAPHAG-X” manufactured by Shimadzu Corporation) was used.
- PET polyethylene terephthalate pellets
- a continuous esterification reactor comprising a three-stage complete mixing tank having a stirrer, a partial condenser, a raw material inlet and a product outlet was used.
- TPA terephthalic acid
- EG ethylene glycol
- antimony trioxide was adjusted to give an amount of Sb atoms of 160 ppm relative to the produced PET. It was continuously supplied to the first esterification reactor of the reaction apparatus and reacted at 255° C. for an average residence time of 4 hours under normal pressure.
- the reaction product in the first esterification reaction can is continuously taken out of the system and supplied to the second esterification reaction can, and distilled from the first esterification reaction can into the second esterification reaction can.
- 8 mass % of EG is supplied to the produced PET, and further, an EG solution containing magnesium acetate tetrahydrate in an amount such that the Mg atom is 65 ppm relative to the produced PET, and an EG solution containing 40 ppm of P atom relative to the produced PET.
- An EG solution containing TMPA (trimethyl phosphate) in an amount corresponding to the above was added and reacted at 260° C. under normal pressure for an average residence time of 1 hour.
- the reaction product in the second esterification reactor was continuously taken out of the system, supplied to the third esterification reactor, and subjected to 39 MPa (400 kg/cm 2 ) using a high-pressure disperser (manufactured by Nippon Seiki Co., Ltd.).
- a high-pressure disperser manufactured by Nippon Seiki Co., Ltd.
- 0.2% by mass of porous colloidal silica having an average particle size of 0.9 ⁇ m which has been subjected to dispersion treatment for an average of 5 passes at a pressure of , and 1% by mass of ammonium salt of polyacrylic acid per calcium carbonate.
- 0.4% by mass of synthetic calcium carbonate with a diameter of 0.6 ⁇ m as a 10% EG slurry the mixture was reacted at normal pressure at 260° C.
- the esterification reaction product produced in the third esterification reaction vessel was continuously supplied to a three-stage continuous polycondensation reactor for polycondensation to sinter stainless steel fibers having a 95% cut diameter of 20 ⁇ m. After filtration with a filter, ultrafiltration was performed, the product was extruded into water, and after cooling, it was cut into chips to obtain PET chips having an intrinsic viscosity of 0.60 dl/g (hereinafter abbreviated as PET (I)). .
- PET (I) intrinsic viscosity of 0.60 dl/g
- the lubricant content in the PET chip was 0.6% by mass.
- PET (II) Preparation of polyethylene terephthalate pellets (PET (II))
- PET(II) a PET chip with an intrinsic viscosity of 0.62 dl/g containing no particles such as calcium carbonate and silica was obtained (hereinafter abbreviated as PET(II)).
- PET (Production of laminated film X1) After drying these PET chips, they were melted at 285° C. and melted at 290° C. by a separate melt extruder extruder to filter sintered stainless steel fibers with a 95% cut diameter of 15 ⁇ m and Two-stage filtration of sintered stainless steel particles of 15 ⁇ m is performed, and they are combined in the feed block to form PET (I) on the surface layer B (anti-releasing surface side layer) and PET (II) on the surface. Laminated so as to form layer A (releasing surface side layer), extruded (cast) into a sheet at a speed of 45 m / min, electrostatically adhered on a casting drum at 30 ° C.
- a 2.3% relaxation treatment was applied in the transverse direction at 170° C. to obtain a biaxially stretched polyethylene terephthalate film X1 having a thickness of 31 ⁇ m.
- the Sa of the surface layer A of the obtained film X1 was 1 nm, and the Sa of the surface layer B was 28 nm.
- E5101 Toyobo Ester (registered trademark) film, manufactured by Toyobo Co., Ltd.) having a thickness of 25 ⁇ m was used.
- E5101 has a structure in which surface layer A and surface layer B contain particles.
- the Sa of the surface layer A of the laminated film X2 was 24 nm, and the Sa of the surface layer B was 24 nm.
- the release layer-forming compositions Y1 to Y4 were coated on the surface layer A of the laminated film X1 or one side of the laminated film X2 by a reverse gravure coater so that the film thickness after drying would be a predetermined thickness. Then, after drying with hot air at 90° C. for 20 seconds, it was immediately irradiated with ultraviolet rays (100 mJ/cm 2 ) using an electrodeless lamp (H bulb manufactured by Heraeus) to form a release layer.
- the release layer was formed by roll-to-roll. That is, a release film roll provided with a release layer was obtained by unwinding a roll-shaped laminated film, successively performing coating, drying, and ultraviolet irradiation, and winding it into a roll.
- the hydrophobized layer-forming compositions Z1 to Z3 were applied to the surface of the base film on which the release layer was not provided by a reverse gravure coater so that the film thickness after drying would be a predetermined thickness. Then, after drying with hot air at 90° C. for 20 seconds, it was immediately irradiated with ultraviolet rays (100 mJ/cm 2 ) using an electrodeless lamp (H bulb manufactured by Heraeus) to form a hydrophobic layer. Formation of the hydrophobized layer was performed by roll-to-roll.
- a release film roll provided with a release layer is unwound, coating, drying, and ultraviolet irradiation are successively performed in order, and a release layer and a hydrophobic layer are provided by winding into a roll.
- a film roll was obtained.
- Example 1 The release layer-forming composition Y1 is applied onto the surface layer A of the laminate film X1 to form a release layer, and then the hydrophobized layer-forming composition Z1 is applied onto the surface layer B to form a hydrophobized layer.
- a release film roll for resin sheet molding was obtained.
- the release layer and the hydrophobized layer were formed so as to have thicknesses shown in Table 1.
- a release film sample was unwound and collected from the obtained release film roll, and each evaluation was performed.
- the film structure and various physical property values are shown in Table 1A.
- Example 2 to 11 A release film roll for resin sheet molding was obtained in the same manner as in Example 1 so that the base film, release layer, and hydrophobic layer shown in Table 1 were combined. A release film sample was unwound and collected from the obtained release film roll, and each evaluation was performed. The film structure and various physical property values are shown in Table 1A or Table 1B.
- the hydrophobic layer is provided on the side opposite to the release layer of the base film, the release layer and the hydrophobic layer come into contact when the release film is stored in a rolled state. Therefore, there is no risk of poor curing of the release layer due to moisture, and excellent releasability is obtained.
- cationic curable polydimethylsiloxane is contained on both the release layer and the hydrophobic layer, it is possible to suppress charging when the film is unwound from a roll. Therefore, according to the present invention, for example, minute environmental foreign matter during the process, film waste generated at the time of slitting, and the like can be suppressed from adhering due to static electricity, and contamination of the resin sheet can be suppressed. Further, for example, a resin sheet having a thickness of 0.2 ⁇ m or more and 1.0 ⁇ m or less can be peeled with a low peeling force because the peel electrification is suppressed.
- Comparative Examples 1 to 5 A release film for resin sheet molding was obtained in the same manner as in Example 1 so that the combination of the substrate film, release layer, and hydrophobized layer shown in Table 1 was obtained. Comparative Examples 1 to 4 were evaluated using a release film roll provided with a release layer without providing a hydrophobic layer. The film structure and various physical property values are shown in Table 1B.
- Comparative Example 1 since the release layer did not contain the cationic curable polydimethylsiloxane (a) and was a release layer using a radical curable resin, poor curing due to oxygen inhibition occurred, and peeling occurred after heating. The ratio (II)/(I) between the force (II) and the normal peel force (I) was large, indicating deterioration in peelability. In addition, the unwinding charge was also high. Comparative Examples 2 to 4 do not have a hydrophobized layer (a hydrophobized layer with a water contact angle of 90° or more and 130° or less), so when the release film is stored in a roll state, it may be affected by moisture.
- a hydrophobized layer a hydrophobized layer with a water contact angle of 90° or more and 130° or less
- the release film by having a release layer on one surface of the base film and providing a hydrophobic layer on the release surface of the base film, the release film has excellent releasability and low unwinding electrification. It is possible to produce an ultra-thin resin sheet having a thickness of 1 ⁇ m or less without causing defects.
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Abstract
Description
そのため、カチオン硬化型樹脂を用いた離型フィルムを製造する場合、基材フィルムの一方の面に離型層形成組成物を塗布し、乾燥後に活性エネルギー線を照射して離型層形成組成物を硬化させた後、ロール状に巻取り保管した状態でカチオン重合反応が完結し、優れた剥離性が得られる離型層が形成され得る。
更に、ロール状に巻取り保管した直後は、重合反応が完結していないことがあり、離型層の表面形状に影響を及ぼす可能性がある。このため、さらに離型層の表面形状の欠点をより低減できることが望ましい。
[1]基材フィルムと、基材フィルムの一方の面に設けられた離型層を有する樹脂シート成型用離型フィルムであって、
離型フィルムは、前記基材フィルムの前記離型層とは反対側の面に疎水化層を有し、
前記離型層がカチオン硬化型ポリジメチルシロキサン(a)を有する組成物の硬化物から形成された層であり、
前記疎水化層の水接触角が90°以上130°以下であり、
前記樹脂シート成型用離型フィルムをロール状に一度巻取った後、巻出して得た離型フィルムにおいて測定した離型層の常態剥離力(I)と加熱後剥離力(II)が、
(II)/(I)=1.00以上1.50以下である離型フィルム。
[2]一態様において、前記巻出して得た離型フィルムにおける離型層の常態剥離力(I)が1500mN/50mm以下である。
[3]一態様において、 前記離型フィルムをロール状に巻取り得られた離型フィルムロールを、100m/分で繰り出した際の帯電量が±1kV未満である。
[4]一態様において、 前記疎水化層がカチオン硬化型ポリジメチルシロキサン(a)を有する組成物の硬化物からなる層である。
[5]一態様において、 前記疎水化層の厚みが0.001μm以上0.5μm以下である。
[6]一態様において、 前記離型層および前記疎水化層が、粒径1.0μm以上の粒子を実質的に含まない。
[7]一態様において、 前記基材フィルムが粒径1.0μm以上の無機粒子を実質的に含まない表面層Aと粒子を含む表面層Bとを有するポリエステルフィルムであり、前記表面層A上に離型層が積層され、前記表面層B上に疎水化層が積層される。
[8]一態様において、無機化合物を含む樹脂シート成型用離型フィルムである。
[9]一態様において、 無機化合物を含む樹脂シートは、セラミックグリーンシートである。
[10]一態様において、 厚さが、0.2μm以上1.0μm以下の樹脂シート成型用離型フィルムである。
[11]一態様において、 上記セラミックグリーンシート製造用離型フィルムを用いてセラミックグリーンシートを成型するセラミックグリーンシートの製造方法であって、成型されたセラミックグリーンシートが0.2μm~1.0μmの厚みを有する、セラミックグリーンシートの製造方法が提供される。
更に、離型層の硬化不良が発生することを抑制できるため、例えば、ロール状に保管する際に、離型面と接触する反離型面の凹凸の影響で離型面の平滑性が悪化することを低減できる。このため、離型フィルムの製造から使用するまでに生じ得る離型層の表面形状の欠点を、より低減できる。
カチオン硬化型ポリジメチルシロキサン(a)を用いることで、ロール状態で保管した時に接触する離型層との帯電列が近づき、帯電が抑制されるため、剥離帯電がなく低い力で欠陥なくセラミックグリーンシートを剥離することができる。また、反離型面が疎水化されるため、ロール状態で保管した時に、反離型面の水分の影響を抑えることができ、離型層の硬化不良を防ぐこともできる。
硬化型ポリジメチルシロキサン(a)の詳細は、後述する。
本発明における基材フィルム(以下、基材と記載することがある)として用いるポリエステルフィルムを構成するポリエステルは、特に限定されず、離型フィルム用基材として通常一般に使用されているポリエステルをフィルム成形したものを使用することが出来る。好ましくは、芳香族二塩基酸成分とジオール成分からなる結晶性の線状飽和ポリエステルであり、例えば、ポリエチレンテレフタレート、ポリエチレン-2,6-ナフタレート、ポリブチレンテレフタレート、ポリトリメチレンテレフタレート又はこれらの樹脂の構成成分を主成分とする共重合体がさらに好適である。とりわけ、ポリエチレンテレフタレートから形成されたポリエステルフィルムが特に好適である。ポリエチレンテレフタレートは、エチレンテレフタレートの繰り返し単位が好ましくは90モル%以上、より好ましくは95モル%以上であり、他のジカルボン酸成分、ジオール成分が少量共重合されていてもよい。例えば、コストの点から、テレフタル酸とエチレングリコールのみから製造されたものが好ましい。また、本発明の離型フィルムの効果を阻害しない範囲内で、公知の添加剤、例えば、酸化防止剤、光安定剤、紫外線吸収剤、結晶化剤などを添加してもよい。ポリエステルフィルムは双方向の弾性率の高さ等の理由から二軸配向ポリエステルフィルムであることが好ましい。
なお、本明細書において、単に「ポリエステルフィルム」と記載する場合、表面層Aと表面層Bを有する(積層した)ポリエステルフィルムを意味する。
この態様において、表面層Aに、粒径1.0μm未満1nm以上の粒子は存在してもよい。表面層Aが、粒径1.0μm以上の粒子、例えば無機粒子を実質的に含まないことにより、樹脂シートに基材中の粒子形状が転写して不具合が生じることを低減できる。
一態様において、表面層Aは、粒径1.0μm未満の粒子についても含有しないことで、樹脂シートに基材中の粒子形状が転写して不具合が生じることを、より効果的に抑制できる。
一態様において、上記ポリエステルフィルム基材は、少なくとも片面には実質的に無機粒子を含まない表面層Aを有する積層フィルムであることが好ましい。これにより、更に効果的に、樹脂シートに基材中の粒子形状が転写して不具合が生じることを抑制できる。
例えば、粒径1.0μm未満の粒子を実質的に含有しない表面層Aは、粒径1.0μm以上の粒子についても実質的に含まない態様が好ましい。
2層以上の多層構成からなる積層ポリエステルフィルムの場合は、実質的に無機粒子を含有しない表面層Aの反対面には、無機粒子などを含有することができる表面層Bを有することが好ましい。
積層構成としては、離型層を塗布する側の層をA層、その反対面の層をB層、これら以外の芯層をC層とすると、厚み方向の層構成は離型層/A/B、あるいは離型層/A/C/B等の積層構造が挙げられる。当然ながらC層は複数の層構成であっても構わない。また、表面層Bには無機粒子を含まないこともできる。その場合、フィルムをロール状に巻き取るための滑り性付与するため、表面層B上には少なくとも無機粒子とバインダーを含んだコート層を設けることが好ましい。
このとき、表面層Bのフィルムの領域表面平均粗さ(Sa)は、1~40nmの範囲であることが好ましい。より好ましくは、5~35nmの範囲である。シリカ粒子及び/又は炭酸カルシウム粒子の合計が5000ppm以上、Saが1nm以上の場合には、フィルムをロール状に巻き上げるときに、空気を均一に逃がすことができ、巻き姿が良好で平面性良好により、超薄層セラミックグリーンシートの製造に好適なものとなる。また、シリカ粒子及び/又は炭酸カルシウム粒子の合計が15000ppm以下、Saが40nm以下の場合には、滑剤の凝集が生じにくく、粗大突起ができないため、超薄層のセラミックグリーンシート製造時に品質が安定し好ましい。
本発明において、離型層は基材フィルムの一方の面に形成される。実質的に無機粒子を含有しない表面層Aを有する基材フィルムを用いる場合には、表面層A上に離型層を形成することが好ましい。実質的に無機粒子を含有しない表面層A上に離型層を設けることで、平滑性に優れた離型層表面を実現でき、離型層上に設ける樹脂シートの変形、欠陥を抑制できるため好ましい。
また、カチオン硬化型ポリジメチルシロキサンは活性エネルギー線で硬化が進行するため、硬化反応に130℃以上の高い熱を必要としない。そのため、加工時の熱によって離型フィルムの平面性が損なわれることを抑制できる。その結果、樹脂シート成型用離型フィルムへの異物の混入や離型層のキズの発生を抑制でき、セラミックグリーンシート等の被離型体に対して、異物、キズの転写によるシートダメージの発生を抑制できる。
(II)/(I)=1.00以上1.50以下である離型フィルムである。
本発明に係る離型層の常態剥離力(I)と加熱後剥離力(II)の比が所定の条件を有することで、例えば、離型層の硬化度を評価することができる。
離型フィルムは、セラミックグリーンシートに代表される樹脂シートを離型フィルム上に成型する時や、剥離する時には熱がかけられることがある。
本発明における常態剥離力(I)と加熱後剥離力(II)が所定の範囲内であることで、加熱前後で安定したセラミックグリーンシートの保持と剥離性を示すことができる。
例えば、特定の理論に限定して解釈すべきではないが、常態剥離力(I)と加熱後剥離力(II)の差がない、あるいは、本発明の範囲内であれば、安定的な剥離性を示すことができる。常態剥離力(I)と加熱後剥離力(II)の比、(II)/(I)が1.00以上1.50以下であり、1.00以上1.45以下であることがより好ましい。例えば、1.00以上1.40以下であってもよい。例えば、1.05以上であってもよく、1.10以上であってもよい。
常態剥離力(I)と加熱後剥離力(II)の比(II)/(I)が1.50以下であれば、離型層の硬化が十分進行し、未反応物が少ないことを意味し、セラミックグリーンシート等の樹脂シートに対する優れた剥離性を有するため好ましい。一般的に、常態剥離力よりも加熱後剥離力が高く出るため、1.00以上であることが好ましい。詳細な評価方法については後述する。
本発明においては、樹脂シート成型用離型フィルムをロール状に一度巻取った後、巻出して得た離型フィルムにおいて測定した離型層の常態剥離力(I)と加熱後剥離力(II)を測定することで、経時で進行する離型層の重合反応の進行度を間接的に評価することができる。また、ロール状態で保管したことで生じる離型層の平面性の影響も考慮した剥離力を評価できる。
疎水化層を設けた後、ロール状で保管することで離型層の反応をより進行させることができ、剥離力が安定し、優れた表面形状を保持した状態の離型層を得ることができ、加熱後の剥離力にも優れた離型フィルムが得られる。
一態様において、離型層は、高い平滑性を有することが好ましいため、実質的に無機粒子を含まない、具体的には粒径1.0μm未満の粒子を実質的に含有しない表面層A、好ましくは粒子を実質的に含有しない表面層Aを有する基材フィルムの上に、本発明に係る離型層を設けることが好ましい。
例えば、粒径1.0μm未満の粒子を実質的に含有しない離型層は、粒径1.0μm以上の粒子についても実質的に含まない態様が好ましい。
無機粒子を実質的に含まない表面層Aに離型層を設ける場合、離型層の領域表面粗さSaは、7nm以下であり、かつ、最大突起高さは50nm以下である。
離型層がこのような特徴を有することで、高い平滑性が要求される超薄膜の樹脂シート、例えば、セラミックグリーンシートに対するピンホールの発生を抑制でき、均一な膜厚の樹脂シートを形成できる。
更に、本発明の離型フィルムは、本発明に係る離型層と、疎水化層とを有することで、樹脂シートに対する優れた剥離性を有し、その上、樹脂シートを巻取り保管する際に、ピンホール、シワ及びズレの発生を抑制できる。加えて、本発明は、巻き出し帯電が高くなることを抑制できる。このように、本発明の離型フィルムは、高い平滑性と優れた剥離性により樹脂シートを良好に製造できるだけでなく、フィルムの巻取時及び搬送時のハンドリング性を向上させることができ、巻き出し帯電を抑制することにより異物混入を低減できる。
最大突起高さ(Sp)も小さいほど好ましく、1nm以上であってもよく、3nm以上であってもよい。また、最大突起高さ(Sp)は25nm以下であってもよく、20nm以下であってもよい。
なお、本発明において、カチオン硬化型ポリジメチルシロキサン(a)を主成分とする場合、離型層の樹脂固形分100質量部に対して、組成物は、カチオン硬化型ポリジメチルシロキサン(a)を少なくとも50質量部、例えば、50質量部超、好ましくは70質量部以上、例えば、80質量部以上含み、一態様においては、90質量部以上含む。また、実質的に、離型層の樹脂固形分の全体に、カチオン硬化型ポリジメチルシロキサン(a)が含まれる態様であってもよい。
脂環式エポキシ基を2個以上有することで、カチオン硬化反応によって架橋反応が進行し、耐溶剤性に優れる離型層となる。また、同時に離型層に含まれるポリジメチルシロキサン(a)とも架橋反応が進行するため、剥離性に優れ、かつポリジメチルシロキサン(a)のセラミックグリーンシートへの移行も抑えられるため好ましい。
カチオン硬化型樹脂(b)の含有量を50質量部超、例えば、80質量%以上とし、離型層中の主成分とすることで、架橋密度が高く剥離性に優れる離型層となるため好ましい。また、離型層中に含まれるカチオン硬化型ポリジメチルシロキサン(a)の含有量を少なくでき、乾燥工程で離型層表面にポリジメチルシロキサン(a)由来の組成が凝集することを抑制でき、平面性が悪化する恐れがなく好ましい。カチオン硬化型樹脂(b)の含有量が多いほど平滑性に優れる離型層となるが、カチオン硬化型ポリジメチルシロキサン(a)を含有し剥離性を確保するためには、カチオン硬化型樹脂(b)は、99.9質量%以下であることが好ましい。
本発明において、離型層形成組成物が硬化した離型層においては、シリコーン骨格を有さないカチオン硬化型樹脂(b)由来の化合物(硬化物)が存在している。本明細書では、離型層中に存在する(b)由来の化合物についても、単に、シリコーン骨格を有さないカチオン硬化型樹脂(b)と記載する場合がある。
酸発生剤としては、特に限定されず一般的なものが使われるが、紫外線照射下で酸が発生する光酸発生剤を用いることで、加工時の熱量を抑えることができ、平面性に優れた離型層となるため好ましい。
疎水化層は、基材フィルムの離型層を設けた面とは反対側の面に形成される。実質的に無機粒子を含有しない、あるいはごく少量の粒子を有し得る表面層A上に、離型層を設けた場合、基材フィルムのもう一方の面の表面層B上に疎水化層が形成される。
例えば、疎水化層は、粒径1.0μm以上の粒子を実質的に含まない。この態様において、疎水化層に、粒径1.0μm未満1nm以上の粒子は存在してもよい。離型層が、粒径1.0μm以上の無機粒子を実質的に含まないことにより、離型フィルムをロール状に巻き取ったときに、反離型面(疎水化層)に存在する粒子の影響で、樹脂シートに変形(欠陥)を与える恐れがなく好ましい。
疎水化層は、粒径1.0μm未満の粒子を実質的に含まないことが好ましく、粒子を含有しないことが好ましい。粒径1.0μm未満の粒子を実質的に含有しないことで、樹脂シートを離型フィルム上に成型した後、ロール状で保管した際に、疎水化層中の粒子形状が転写することで樹脂シートが変形する恐れがなく好ましい。また、疎水化層中の粒子が脱落し、樹脂シートに混入する恐れもなくなるため好ましい。特に、粒子を実質的に含まないことで、上記効果をより良好に奏することができる。
例えば、粒径1.0μm未満の粒子を実質的に含有しない表面層Aは、粒径1.0μm以上の粒子についても実質的に含まない態様が好ましい。なお、このような態様は、実質的に粒子を有さない態様と同一である。
一態様において、疎水化層の水接触角は95°以上130°以下、例えば、98°以上130°以下であってもよい。
本発明においては、特に、疎水化層の水接触角が上記範囲内にあり、疎水化層は、離型層に含まれるカチオン硬化型ポリジメチルシロキサン(a)を含むことで、基材フィルムの反離型面に吸着すると考えられる水分を少なくすることができ、ロール状態で接触する離型層の硬化阻害を引き起こすという課題をより顕著に解決できる。また、ロール状のフィルムを巻きだす際、離型層への異物の付着を抑制でき、離型層の高い平滑性を保つことができる。さらに、ロール状態で保管時や運送時に水分を吸着しづらくなり、吸湿シワや巻きズレなどのロール外観品位が悪化することも防ぐことができるため好ましい。
ここで、疎水化層においては、水接触角が本発明の範囲を逸脱しない範囲で、酸発生剤(c)を含むことができる。
なお、離型層を形成する組成物と、疎水化層を形成する組成物は、同種の樹脂を含む態様であっても、各組成物中に含まれる溶剤の量が相違し得る。このため、得られる高分子の構造の同定やそれに基づくクレームの特定は容易ではなく、非実際的な事情が存在する。
本発明において、離型層を形成する離型層形成組成物の塗布は、ポリエステルフィルムの製造過程で実施するインライン方式またはポリエステルフィルムの製造後に実施するオフライン方式であることが好ましい。
インライン方式で塗布する場合には、フィルム流れ方向(縦方向)に延伸し一軸配向させたフィルムに離型性樹脂を溶解もしくは分散させた塗液を塗布し、その後横方向(フィルム流れ方向とは直交する方向)に延伸し、2軸配向させると同時に離型層を形成する方法が好ましい。
オフライン方式で塗布する場合には、2軸配向ポリエステルフィルムの一方の面に、離型性樹脂を溶解もしくは分散させた塗液を塗布し、溶媒等を乾燥により除去後、加熱乾燥、熱硬化または紫外線硬化させる方法が用いられる。
オフライン方式で塗布する時の塗液は、特に限定されないが、有機溶剤を用いたものが好ましく、沸点が90℃以上の溶剤を添加することが好ましい。沸点が90℃以上の溶剤を添加することで、乾燥時の突沸を防ぎ、塗膜をレベリングさせることができ、乾燥後の塗膜表面の平滑性を向上させることができる。
本発明において、ロール状態で保管した離型フィルムを巻出した時の巻出し帯電量を低く抑えることができる。ロール状に巻き取られた離型フィルムを100m/minで巻出た時の帯電量が±1.0kV未満であることが好ましい。±1.0未満であると、工程中の極微小な異物が離型フィルムに付着する恐れがなく好ましい。また、樹脂シートを剥離するときの剥離帯電も低く抑えられ、より低く均一な力で剥離することができるため好ましい。
特定の理論に限定して解釈すべきではないが、本発明においては、離型層がカチオン硬化型ポリジメチルシロキサン(a)を含み、更に、疎水化層の水接触角が90°以上130°以下であることにより、基材フィルムの反離型面側に微量に存在していると考えられる水分の影響による、カチオン硬化型樹脂の経時反応が阻害されることを抑制でき、離型層の硬化が不十分となるという問題を解決できる。その結果、加熱後剥離力(II)を上記範囲に導くことができ、例えば、樹脂シートを成型する工程において、30℃以上120℃以下の条件で加工する際、樹脂シート形成組成物を良好に保持でき、また、得られた樹脂シートの剥離を容易行うことができる。
したがって、本発明においては、樹脂シート形成組成物の保持と、加熱後の剥離をバランスよく有することができる。例えば、セラミックグリーンシートが1.0μm以下の極めて薄い厚みを有する態様においても、これらの効果を奏することができる。
一態様において、本発明の離型フィルムは、樹脂シートであれば、特に限定されず、粘着剤、光学フィルムの製造に適用してもよい。一態様において、無機化合物を含む樹脂シート成型用離型フィルムである。無機化合物としては、金属粒子、金属酸化物、鉱物などを例示でき、例えば、炭酸カルシウム、シリカ粒子、アルミ粒子、チタン酸バリウム粒子等を例示できる。
樹脂としては、例えばポリビニルアセタール樹脂、ポリ(メタ)アクリル酸エステル樹脂等を挙げることができる。
本発明は、平滑性の高い離型層と、平滑性、ハンドリング性及び帯電防止性に優れた背面層を有するため、これら無機化合物を樹脂シートに含む態様であっても、無機化合物に起因し得る欠点、例えば、樹脂シートの破損、離型層から樹脂シートの剥離が困難になる問題を抑制できる。
樹脂シートを形成する樹脂成分は、用途に応じて適宜選択できる。
一態様において、無機化合物を含む樹脂シートは、セラミックグリーンシートである。例えば、セラミックグリーンシートは、無機化合物として、チタン酸バリウムを含むことができる。一態様において、樹脂シートは厚さが、0.2μm以上1.0μm以下である。
一般に、積層セラミックコンデンサは、直方体状のセラミック素体を有する。セラミック素体の内部には、第1の内部電極と第2の内部電極とが厚み方向に沿って交互に設けられている。第1の内部電極は、セラミック素体の第1の端面に露出している。第1の端面の上には第1の外部電極が設けられている。第1の内部電極は、第1の端面において第1の外部電極と電気的に接続されている。第2の内部電極は、セラミック素体の第2の端面に露出している。第2の端面の上には第2の外部電極が設けられている。第2の内部電極は、第2の端面において第2の外部電極と電気的に接続されている。
例えば、本発明のセラミックグリーンシート製造用離型フィルムを用いてセラミックグリーンシートを成型するセラミックグリーンシートの製造方法は、0.2μm~1.0μmの厚みを有するセラミックグリーンシートを成型できる
より詳細には、例えば、以下のようにしてセラミックグリーンシートは製造される。まず、本発明の離型フィルムをキャリアフィルムとして用い、セラミック素体を構成するためのセラミックスラリーを塗布、乾燥させる。セラミックグリーンシートの厚みは、0.2~1.0μmの極薄品が求められてきている。塗布、乾燥したセラミックグリーンシートの上に、第1又は第2の内部電極を構成するための導電層を印刷する。セラミックグリーンシート、第1の内部電極を構成するための導電層が印刷されたセラミックグリーンシート及び第2の内部電極を構成するための導電層が印刷されたセラミックグリーンシートを適宜積層し、プレスすることにより、マザー積層体を得る。マザー積層体を複数に分断し、生のセラミック素体を作製する。生のセラミック素体を焼成することによりセラミック素体を得る。その後、第1及び第2の外部電極を形成することにより積層セラミックコンデンサを完成させることができる。
切り出した離型フィルムを樹脂包埋し、ウルトラミクロトームを用いて超薄切片化した。その後、日本電子製JEM2100透過電子顕微鏡を用いて、断面観察を行い、観察したTEM画像から離型層の膜厚を測定した。厚みが薄すぎて断面観察で正確に評価できない場合は、反射分光膜厚計(大塚電子社製、FE-3000)を用いて測定した。
非接触表面形状計測システム(VertScan R550H-M100)を用いて、下記の条件で測定した。領域表面平均粗さ(Sa)は、5回測定の平均値を採用し、最大突起高さ(Sp)は7回測定し最大値と最小値を除いた5回の測定結果における、最大の値のものを採用した。
(測定条件)
・測定モード:WAVEモード
・対物レンズ:50倍
・0.5×Tubeレンズ
・測定面積 187μm×139μm
(解析条件)
・面補正: 4次補正
・補間処理: 完全補間
各実施例および各比較例で得られた樹脂シート製造用離型フィルムを巾400mm、長さ6000mのロール状に巻き上げ、離型フィルムロールを得た。この時の巻取張力は150N/mm、タッチロール圧は700N/mで巻き上げた。得られたフィルムロールを20~25℃、湿度40~50RH%の環境下、3日間保管した後に巻き出して、測定用の離型フィルムを採取した。測定用離型フィルムの離型層表面に粘着テープ(日東電工(株)社製の「31B」)を貼り合わせ、幅25mm、長さ150mmの短冊状に粘着テープ付き離型フィルムを裁断した。裁断した粘着テープ付き離型フィルムを5kgの圧着ローラで圧着後、温度22℃、湿度60%の条件下で20時間放置した。その後、粘着テープの一端を固定し、離型フィルムの一端を担持し、離型フィルム側を300mm/minの速度で引っ張り、T型剥離にて測定した。測定には、引っ張り試験機((株)島津製作所製の「AUTOGRAPHAG-X」)を用いた。
前記常態剥離力(I)と同様に評価用の離型フィルムを採取し、離型層表面に粘着テープ(日東電工(株)製、商品名「31B」)を貼り合わせ、幅25mm、長さ150mmの短冊状に粘着テープ付き離型フィルムを裁断した。裁断した粘着テープ付き離型フィルムを5kgの圧着ローラで圧着後、温度70℃のオーブンで20時間加熱した。その後、粘着テープの一端を固定し、離型フィルムの一端を把持し、離型フィルム側を300mm/minの速度で引っ張って剥離し、T型剥離にて測定した。測定には、引っ張り試験機((株)島津製作所製の「AUTOGRAPHAG-X」)を用いた。
各実施例および各比較例で得られた樹脂シート製造用剥離フィルムを、幅400mm、長さ6000mのロール状に巻き上げ、離型フィルムロールを得た。この時の巻取張力は150mN/mm、タッチロール圧は700N/mで巻き上げた。この離型フィルムロールを20~25℃、湿度40~50RH%以下の環境下に30日間保管した後、100m/minで巻き出す際の帯電量を春日電機社製「KSD-0103」を用いて測定した。帯電量は、巻出し直後100mmの箇所について、巻出し長さ500M毎に測定し、その平均値を算出した。
〇:±1.0kV未満
×:±1.0kV以上
自動接触角計(協和界面科学社製:DM-701)を用いて、22℃、60%RHの条件下で、離型面に接する水の接触角を測定した。水の滴下量は1.8μLであり、滴下後60秒経過後の接触角の値を採用した。
エステル化反応装置として、攪拌装置、分縮器、原料仕込口及び生成物取出口を有する3段の完全混合槽よりなる連続エステル化反応装置を用いた。TPA(テレフタル酸)を2トン/時とし、EG(エチレングリコール)をTPA1モルに対して2モルとし、三酸化アンチモンを生成PETに対してSb原子が160ppmとなる量とし、これらのスラリーをエステル化反応装置の第1エステル化反応缶に連続供給し、常圧にて平均滞留時間4時間、255℃で反応させた。次いで、第1エステル化反応缶内の反応生成物を連続的に系外に取り出して第2エステル化反応缶に供給し、第2エステル化反応缶内に第1エステル化反応缶から留去されるEGを生成PETに対して8質量%供給し、さらに、生成PETに対してMg原子が65ppmとなる量の酢酸マグネシウム四水塩を含むEG溶液と、生成PETに対してP原子が40ppmのとなる量のTMPA(リン酸トリメチル)を含むEG溶液を添加し、常圧にて平均滞留時間1時間、260℃で反応させた。次いで、第2エステル化反応缶の反応生成物を連続的に系外に取り出して第3エステル化反応缶に供給し、高圧分散機(日本精機社製)を用いて39MPa(400kg/cm2)の圧力で平均処理回数5パスの分散処理をした平均粒径が0.9μmの多孔質コロイダルシリカ0.2質量%と、ポリアクリル酸のアンモニウム塩を炭酸カルシウムあたり1質量%付着させた平均粒径が0.6μmの合成炭酸カルシウム0.4質量%とを、それぞれ10%のEGスラリーとして添加しながら、常圧にて平均滞留時間0.5時間、260℃で反応させた。第3エステル化反応缶内で生成したエステル化反応生成物を3段の連続重縮合反応装置に連続的に供給して重縮合を行い、95%カット径が20μmのステンレススチール繊維を焼結したフィルターで濾過を行ってから、限外濾過を行って水中に押出し、冷却後にチップ状にカットして、固有粘度0.60dl/gのPETチップを得た(以後、PET(I)と略す)。PETチップ中の滑剤含有量は0.6質量%であった。
一方、上記PET(I)チップの製造において、炭酸カルシウム、シリカ等の粒子を全く含有しない固有粘度0.62dl/gのPETチップを得た(以後、PET(II)と略す。)。
これらのPETチップを乾燥後、285℃で溶融し、別個の溶融押出し機押出機により290℃で溶融し、95%カット径が15μmのステンレススチール繊維を焼結したフィルターと、95%カット径が15μmのステンレススチール粒子を焼結したフィルターの2段の濾過を行って、フィードブロック内で合流して、PET(I)を表面層B(反離型面側層)、PET(II)を表面層A(離型面側層)となるように積層し、シート状に45m/分のスピードで押出(キャスティング)し、静電密着法により30℃のキャスティングドラム上に静電密着・冷却させ、固有粘度が0.59dl/gの未延伸ポリエチレンテレフタレートシートを得た。層比率は各押出機の吐出量計算でPET(I)/(II)=60質量%/40質量%となるように調整した。次いで、この未延伸シートを赤外線ヒーターで加熱した後、ロール温度80℃でロール間のスピード差により縦方向に3.5倍延伸した。その後、テンターに導き、140℃で横方向に4.2倍の延伸を行なった。次いで、熱固定ゾーンにおいて、210℃で熱処理した。その後、横方向に170℃で2.3%の緩和処理をして、厚さ31μmの二軸延伸ポリエチレンテレフタレートフィルムX1を得た。得られたフィルムX1の表面層AのSaは1nm、表面層BのSaは28nmであった。
積層フィルムX2としては、厚み25μmのE5101(東洋紡エステル(登録商標)フィルム、東洋紡社製)を使用した。E5101は、表面層A及び表面層Bに粒子を含有した構成になっている。積層フィルムX2の表面層AのSaは24nm、表面層BのSaは24nmであった。
メチルエチルケトン 49.833質量部
トルエン 49.833質量部
カチオン硬化型ポリジメチルシロキサン(a):
脂環式エポキシ基含有ポリジメチルシロキサン 0.316質量部
(製品名:シリコリース UV POLY215、荒川化学工業社製、固形分濃度100%)
酸発生剤(c) 0.018質量部
(製品名:UV CATA211、荒川化学工業社製、固形分濃度18%)
メチルエチルケトン 47.361質量部
トルエン 47.361質量部
カチオン硬化型ポリジメチルシロキサン(a) 0.250質量部
(製品名:シリコリース UV POLY215、荒川化学工業社製、固形分濃度100%)
シリコーン骨格を有さないカチオン硬化型樹脂(b):
2官能脂環式エポキシモノマー 4.750質量部
(製品名:セロキサイド2021P、ダイセル社製、固形分濃度100%)
酸発生剤(c) 0.278質量部
(製品名:UV CATA211、荒川化学工業社製、固形分濃度18%)
メチルエチルケトン 44.900質量部
トルエン 44.900質量部
ジペンタエリスリトールヘキサアクリレート 9.500質量部
(製品名:A-DPH、新中村化学社製、固形分濃度100%)
アクリロイル基含有ポリジメチルシロキサン 0.500質量部
(製品名:BYK UV3500、ビックケミージャパン社製、固形分濃度100%)
開始剤 0.200質量部
(製品名:Omnirad907、IGM Resins社製、固形分濃度100%)
メチルエチルケトン 47.361質量部
トルエン 47.361質量部
カチオン硬化型ポリジメチルシロキサン(a):
側鎖エポキシ基変性ポリジメチルシロキサン 0.250質量部
(製品名:KF-101、信越化学工業社製、固形分濃度100%)
シリコーン骨格を有さないカチオン硬化型樹脂(b):
3官能エポキシ樹脂 4.750質量部
(製品名:デナコールEX-421、ナガセケムテック社製、固形分濃度100%)
酸発生剤(c) 0.278質量部
(製品名:UV CATA211、荒川化学工業社製、固形分濃度18%)
メチルエチルケトン 69.766質量部
トルエン 29.900質量部
カチオン硬化型ポリジメチルシロキサン(a):
脂環式エポキシ基含有ポリジメチルシロキサン 0.316質量部
(製品名:シリコリース UV POLY200、荒川化学工業社製、固形分濃度100%)
酸発生剤(c) 0.018質量部
(製品名:UV CATA211、荒川化学工業社製、固形分濃度18%)
メチルエチルケトン 71.041質量部
トルエン 23.681質量部
カチオン硬化型ポリジメチルシロキサン(a) 0.250質量部
(製品名:シリコリース UV POLY200、荒川化学工業社製、固形分濃度100%)
シリコーン骨格を有さないカチオン硬化型樹脂(b):
2官能脂環式エポキシモノマー 4.750質量部
(製品名:セロキサイド2021P、ダイセル社製、固形分濃度100%)
酸発生剤(c) 0.278質量部
(製品名:UV CATA211、荒川化学工業社製、固形分濃度18%)
メチルエチルケトン 47.361質量部
トルエン 47.361質量部
シリコーン骨格を有さないカチオン硬化型樹脂(b):
2官能脂環式エポキシモノマー 5.000質量部
(製品名:セロキサイド2021P、ダイセル社製、固形分濃度100%)
酸発生剤(c) 0.278質量部
離型層形成組成物Y1~Y4を積層フィルムX1の表面層A上または積層フィルムX2の一方の面に、乾燥後の膜厚が所定の厚みになるようにリバースグラビアコーターにて塗布した。次いで、90℃の熱風で20秒間乾燥した後、直ちに無電極ランプ(へレウス社製Hバルブ)にて紫外線照射(100mJ/cm2)を行い、離型層を形成した。離型層の形成は、ロールtoロールで行った。すなわち、ロール状の積層フィルムを巻出し、塗布、乾燥、紫外線照射を順に連続的に行い、ロール状に巻取ることで離型層が設けられた離型フィルムロールを得た。
疎水化層形成組成物Z1~Z3を、基材フィルムの離型層が設けられていない面に、乾燥後の膜厚が所定の厚みになるようにリバースグラビアコーターにて塗布した。ついで、90℃の熱風で20秒間乾燥した後、直ちに無電極ランプ(へレウス社製Hバルブ)にて紫外線照射(100mJ/cm2)を行い、疎水化層を形成した。疎水化層の形成は、ロールtoロールで行った。すなわち、離型層が設けられた離型フィルムロールを巻出し、塗布、乾燥、紫外線照射を順に連続的に行い、ロール状に巻取ることで離型層と疎水化層が設けられた離型フィルムロールを得た。
積層フィルムX1の表面層A上に離型層形成組成物Y1を塗布し、離型層を形成した後に、表面層B上に疎水化層形成組成物Z1を塗布し、疎水化層を形成することで樹脂シート成型用離型フィルムロールを得た。離型層、疎水化層の厚みは表1に示す値になるように形成した。得られた離型フィルムロールから、離型フィルムサンプルを巻き出して採取し、各評価を実施した。フィルム構成、各種物性値を、表1Aに示す。
表1に示す基材フィルム、離型層、疎水化層の組み合わせになるように実施例1と同様の方法で樹脂シート成型用離型フィルムロールを得た。得られた離型フィルムロールから、離型フィルムサンプルを巻き出して採取し、各評価を実施した。フィルム構成、各種物性値を、表1Aまたは表1Bに示す。
表1に示す基材フィルム、離型層、疎水化層の組み合わせになるように、実施例1と同様の方法で樹脂シート成型用離型フィルムを得た。比較例1~4は疎水化層を設けずに離型層が設けられた離型フィルムロールを用いて、各評価を実施した。フィルム構成、各種物性値を、表1Bに示す。
Claims (11)
- 基材フィルムと、基材フィルムの一方の面に設けられた離型層を有する樹脂シート成型用離型フィルムであって、
前記樹脂シート成型用離型フィルムは、前記基材フィルムの前記離型層とは反対側の面に疎水化層を有し、
前記離型層がカチオン硬化型ポリジメチルシロキサン(a)を有する組成物の硬化物から形成された層であり、
前記疎水化層の水接触角が90°以上130°以下であり、
前記樹脂シート成型用離型フィルムをロール状に一度巻取った後、巻出して得た離型フィルムにおいて測定した離型層の常態剥離力(I)と加熱後剥離力(II)が、
(II)/(I)=1.00以上1.50以下である、樹脂シート成型用離型フィルム。 - 前記巻出して得た離型フィルムにおいて測定した離型層の常態剥離力(I)が1500mN/50mm以下である請求項1に記載の樹脂シート成型用離型フィルム。
- 前記樹脂シート成型用離型フィルムをロール状に巻取り得られた離型フィルムロールを、100m/分で繰り出した際の帯電量が±1kV未満である、請求項1または2に記載の樹脂シート成型用離型フィルム。
- 前記疎水化層がカチオン硬化型ポリジメチルシロキサン(a)を有する組成物の硬化物からなる請求項1~3のいずれかに記載の樹脂シート成型用離型フィルム。
- 前記疎水化層の厚みが0.001μm以上0.5μm以下である、請求項1~4のいずれかに記載の樹脂シート成型用離型フィルム。
- 前記離型層および前記疎水化層が、粒径1.0μm以上の粒子を実質的に含まない、請求項1~5のいずれかに記載の樹脂シート成型用離型フィルム。
- 前記基材フィルムが、粒径1.0μm以上の粒子を実質的に含まない表面層Aと、粒子を含む表面層Bとを有するポリエステルフィルムであり、
前記表面層A上に離型層が積層され、前記表面層B上に疎水化層が積層される、請求項1~6のいずれかに記載の樹脂シート成型用離型フィルム。 - 樹脂シートが無機化合物を含むシートである、請求項1~7のいずれかに記載の樹脂シート成型用離型フィルム。
- 無機化合物を含む樹脂シートは、セラミックグリーンシートである、請求項8に記載の樹脂シート成型用離型フィルム。
- 厚さが、0.2μm以上1.0μm以下の樹脂シート成型用離型フィルムである、請求項1~9のいずれかに記載の樹脂シート成型用離型フィルム。
- 請求項9に記載の樹脂シート成型用離型フィルムを用いてセラミックグリーンシートを成型するセラミックグリーンシートの製造方法であって、成型されたセラミックグリーンシートが0.2μm~1.0μmの厚みを有する、セラミックグリーンシートの製造方法。
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JP2013073700A (ja) * | 2011-09-27 | 2013-04-22 | Mitsubishi Plastics Inc | 燃料電池用両面離型フィルム |
JP2017002254A (ja) * | 2015-06-16 | 2017-01-05 | 三菱樹脂株式会社 | 積層ポリエステルフィルム |
JP2019072848A (ja) * | 2017-10-12 | 2019-05-16 | 東洋紡株式会社 | セラミックグリーンシート製造用離型フィルム |
WO2019131449A1 (ja) * | 2017-12-27 | 2019-07-04 | 東洋紡株式会社 | セラミックグリーンシート製造用離型フィルム |
JP2020128055A (ja) * | 2019-02-12 | 2020-08-27 | 三菱ケミカル株式会社 | 離型フィルム |
JP2021070711A (ja) * | 2019-10-29 | 2021-05-06 | 東洋紡株式会社 | レーザー加工支持体用ポリエステルフィルム及び配線基板製造用離型フィルム |
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JP2013073700A (ja) * | 2011-09-27 | 2013-04-22 | Mitsubishi Plastics Inc | 燃料電池用両面離型フィルム |
JP2017002254A (ja) * | 2015-06-16 | 2017-01-05 | 三菱樹脂株式会社 | 積層ポリエステルフィルム |
JP2019072848A (ja) * | 2017-10-12 | 2019-05-16 | 東洋紡株式会社 | セラミックグリーンシート製造用離型フィルム |
WO2019131449A1 (ja) * | 2017-12-27 | 2019-07-04 | 東洋紡株式会社 | セラミックグリーンシート製造用離型フィルム |
JP2020128055A (ja) * | 2019-02-12 | 2020-08-27 | 三菱ケミカル株式会社 | 離型フィルム |
JP2021070711A (ja) * | 2019-10-29 | 2021-05-06 | 東洋紡株式会社 | レーザー加工支持体用ポリエステルフィルム及び配線基板製造用離型フィルム |
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