WO2023136188A1 - スポットポッティング用チキソ性シリコーンゲル組成物及びその硬化物並びにフォトカプラ - Google Patents
スポットポッティング用チキソ性シリコーンゲル組成物及びその硬化物並びにフォトカプラ Download PDFInfo
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- WO2023136188A1 WO2023136188A1 PCT/JP2023/000036 JP2023000036W WO2023136188A1 WO 2023136188 A1 WO2023136188 A1 WO 2023136188A1 JP 2023000036 W JP2023000036 W JP 2023000036W WO 2023136188 A1 WO2023136188 A1 WO 2023136188A1
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- silicone gel
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- 229920001296 polysiloxane Polymers 0.000 title claims abstract description 134
- 239000000203 mixture Substances 0.000 title claims abstract description 92
- 238000004382 potting Methods 0.000 title claims abstract description 42
- 230000009974 thixotropic effect Effects 0.000 title claims description 36
- -1 diphenylsiloxane unit Chemical group 0.000 claims abstract description 76
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 46
- 125000003342 alkenyl group Chemical group 0.000 claims abstract description 35
- 230000035515 penetration Effects 0.000 claims abstract description 26
- 150000007973 cyanuric acids Chemical class 0.000 claims abstract description 18
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 18
- 239000003054 catalyst Substances 0.000 claims abstract description 11
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 8
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 23
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 15
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 14
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 13
- 125000000217 alkyl group Chemical group 0.000 claims description 13
- 125000004433 nitrogen atom Chemical group N* 0.000 claims description 13
- 239000012298 atmosphere Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 12
- 125000005369 trialkoxysilyl group Chemical group 0.000 claims description 11
- 125000001183 hydrocarbyl group Chemical group 0.000 claims description 10
- 239000011521 glass Substances 0.000 claims description 9
- 229920006136 organohydrogenpolysiloxane Polymers 0.000 claims description 9
- 125000004432 carbon atom Chemical group C* 0.000 claims description 8
- ZFSLODLOARCGLH-UHFFFAOYSA-N isocyanuric acid Chemical group OC1=NC(O)=NC(O)=N1 ZFSLODLOARCGLH-UHFFFAOYSA-N 0.000 claims description 8
- 125000001931 aliphatic group Chemical group 0.000 claims description 7
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 125000005401 siloxanyl group Chemical group 0.000 claims description 5
- 125000003808 silyl group Chemical group [H][Si]([H])([H])[*] 0.000 claims description 5
- 150000001367 organochlorosilanes Chemical class 0.000 claims description 4
- 238000001179 sorption measurement Methods 0.000 claims description 4
- 238000001723 curing Methods 0.000 abstract description 25
- 238000002156 mixing Methods 0.000 abstract description 12
- 239000000758 substrate Substances 0.000 abstract description 11
- 239000000843 powder Substances 0.000 abstract description 7
- 238000007789 sealing Methods 0.000 abstract description 6
- 239000004065 semiconductor Substances 0.000 abstract description 6
- 229920005601 base polymer Polymers 0.000 abstract description 3
- 239000003431 cross linking reagent Substances 0.000 abstract description 3
- 238000001029 thermal curing Methods 0.000 abstract 1
- 229920001577 copolymer Polymers 0.000 description 14
- 229920005645 diorganopolysiloxane polymer Polymers 0.000 description 9
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 230000001588 bifunctional effect Effects 0.000 description 6
- 238000006116 polymerization reaction Methods 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 238000013007 heat curing Methods 0.000 description 5
- 239000011256 inorganic filler Substances 0.000 description 5
- 229910003475 inorganic filler Inorganic materials 0.000 description 5
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 description 5
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 5
- 239000004215 Carbon black (E152) Substances 0.000 description 4
- 239000002253 acid Substances 0.000 description 4
- 125000003118 aryl group Chemical group 0.000 description 4
- IJOOHPMOJXWVHK-UHFFFAOYSA-N chlorotrimethylsilane Chemical compound C[Si](C)(C)Cl IJOOHPMOJXWVHK-UHFFFAOYSA-N 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 229920001971 elastomer Polymers 0.000 description 4
- 229910021485 fumed silica Inorganic materials 0.000 description 4
- 238000005227 gel permeation chromatography Methods 0.000 description 4
- 229930195733 hydrocarbon Natural products 0.000 description 4
- 150000002430 hydrocarbons Chemical group 0.000 description 4
- 238000006459 hydrosilylation reaction Methods 0.000 description 4
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 238000007259 addition reaction Methods 0.000 description 3
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 125000001301 ethoxy group Chemical group [H]C([H])([H])C([H])([H])O* 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 125000004051 hexyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 3
- 125000000962 organic group Chemical group 0.000 description 3
- 125000001147 pentyl group Chemical group C(CCCC)* 0.000 description 3
- 239000002683 reaction inhibitor Substances 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- 125000000094 2-phenylethyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])C([H])([H])* 0.000 description 2
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 description 2
- 229910002012 Aerosil® Inorganic materials 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 125000003710 aryl alkyl group Chemical group 0.000 description 2
- 125000001797 benzyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])* 0.000 description 2
- 235000010290 biphenyl Nutrition 0.000 description 2
- 239000004305 biphenyl Substances 0.000 description 2
- 125000006267 biphenyl group Chemical group 0.000 description 2
- 125000004106 butoxy group Chemical group [*]OC([H])([H])C([H])([H])C(C([H])([H])[H])([H])[H] 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 125000004218 chloromethyl group Chemical group [H]C([H])(Cl)* 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 229910002026 crystalline silica Inorganic materials 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 125000000753 cycloalkyl group Chemical group 0.000 description 2
- 239000004205 dimethyl polysiloxane Substances 0.000 description 2
- 235000013870 dimethyl polysiloxane Nutrition 0.000 description 2
- LIKFHECYJZWXFJ-UHFFFAOYSA-N dimethyldichlorosilane Chemical compound C[Si](C)(Cl)Cl LIKFHECYJZWXFJ-UHFFFAOYSA-N 0.000 description 2
- 125000005843 halogen group Chemical group 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 125000003187 heptyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- FFUAGWLWBBFQJT-UHFFFAOYSA-N hexamethyldisilazane Chemical compound C[Si](C)(C)N[Si](C)(C)C FFUAGWLWBBFQJT-UHFFFAOYSA-N 0.000 description 2
- NYMPGSQKHIOWIO-UHFFFAOYSA-N hydroxy(diphenyl)silicon Chemical group C=1C=CC=CC=1[Si](O)C1=CC=CC=C1 NYMPGSQKHIOWIO-UHFFFAOYSA-N 0.000 description 2
- 125000001624 naphthyl group Chemical group 0.000 description 2
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N phenylbenzene Natural products C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 description 2
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 2
- 229920002223 polystyrene Polymers 0.000 description 2
- 125000002572 propoxy group Chemical group [*]OC([H])([H])C(C([H])([H])[H])([H])[H] 0.000 description 2
- 229920002379 silicone rubber Polymers 0.000 description 2
- 239000004945 silicone rubber Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 description 2
- 239000005051 trimethylchlorosilane Substances 0.000 description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 2
- 125000005023 xylyl group Chemical group 0.000 description 2
- NAWXUBYGYWOOIX-SFHVURJKSA-N (2s)-2-[[4-[2-(2,4-diaminoquinazolin-6-yl)ethyl]benzoyl]amino]-4-methylidenepentanedioic acid Chemical compound C1=CC2=NC(N)=NC(N)=C2C=C1CCC1=CC=C(C(=O)N[C@@H](CC(=C)C(O)=O)C(O)=O)C=C1 NAWXUBYGYWOOIX-SFHVURJKSA-N 0.000 description 1
- 238000004438 BET method Methods 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000005909 Kieselgur Substances 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- FMRLDPWIRHBCCC-UHFFFAOYSA-L Zinc carbonate Chemical compound [Zn+2].[O-]C([O-])=O FMRLDPWIRHBCCC-UHFFFAOYSA-L 0.000 description 1
- 238000013006 addition curing Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 150000001299 aldehydes Chemical class 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 125000003545 alkoxy group Chemical group 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 125000001246 bromo group Chemical group Br* 0.000 description 1
- 125000004369 butenyl group Chemical group C(=CCC)* 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 150000001733 carboxylic acid esters Chemical class 0.000 description 1
- 125000001309 chloro group Chemical group Cl* 0.000 description 1
- 239000008119 colloidal silica Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 125000000596 cyclohexenyl group Chemical group C1(=CCCCC1)* 0.000 description 1
- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 1
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 125000001153 fluoro group Chemical group F* 0.000 description 1
- 239000005350 fused silica glass Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000007542 hardness measurement Methods 0.000 description 1
- 125000006038 hexenyl group Chemical group 0.000 description 1
- 239000008240 homogeneous mixture Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 1
- 125000000555 isopropenyl group Chemical group [H]\C([H])=C(\*)C([H])([H])[H] 0.000 description 1
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000005055 methyl trichlorosilane Substances 0.000 description 1
- JLUFWMXJHAVVNN-UHFFFAOYSA-N methyltrichlorosilane Chemical compound C[Si](Cl)(Cl)Cl JLUFWMXJHAVVNN-UHFFFAOYSA-N 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 125000001971 neopentyl group Chemical group [H]C([*])([H])C(C([H])([H])[H])(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 125000002347 octyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 150000003961 organosilicon compounds Chemical class 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 125000002255 pentenyl group Chemical group C(=CCCC)* 0.000 description 1
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 125000004368 propenyl group Chemical group C(=CC)* 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 125000004469 siloxy group Chemical group [SiH3]O* 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- 239000012756 surface treatment agent Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 125000003944 tolyl group Chemical group 0.000 description 1
- 125000000725 trifluoropropyl group Chemical group [H]C([H])(*)C([H])([H])C(F)(F)F 0.000 description 1
- QYJYJTDXBIYRHH-UHFFFAOYSA-N trimethoxy-[8-(oxiran-2-ylmethoxy)octyl]silane Chemical compound C(C1CO1)OCCCCCCCC[Si](OC)(OC)OC QYJYJTDXBIYRHH-UHFFFAOYSA-N 0.000 description 1
- 239000011667 zinc carbonate Substances 0.000 description 1
- 229910000010 zinc carbonate Inorganic materials 0.000 description 1
- 235000004416 zinc carbonate Nutrition 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/54—Silicon-containing compounds
- C08K5/544—Silicon-containing compounds containing nitrogen
-
- 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
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
- C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L83/00—Compositions of 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; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/28—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection
- H01L23/29—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the material, e.g. carbon
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/12—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof structurally associated with, e.g. formed in or on a common substrate with, one or more electric light sources, e.g. electroluminescent light sources, and electrically or optically coupled thereto
Definitions
- the present invention is for spot potting (especially photocoupler sealing), which has a small spreading property when applied to a substrate, a small change in shape before and after heat curing, and a small change in penetration of the cured product under high temperature conditions.
- spot potting especially photocoupler sealing
- a thixotropic silicone gel composition for spot potting
- a cured product thereof silicone gel
- Silicone gel has excellent properties such as electrical insulation, stability of electrical properties, and flexibility. and as a coating material to protect against mechanical damage.
- silicone gel composition used for this purpose is intended to be used by injecting (potting) it into a case, it often has high fluidity and is placed on the control circuit board. It is not suitable for spot potting to cover only specific semiconductor elements.
- Patent Document 1 Japanese Patent No. 3073888 proposes an addition-curable silicone gel composition containing an organopolysiloxane having 3,3,3-trifluoropropyl groups in the molecular side chains and hydrophobized silica.
- Patent Document 2 JP-A-9-132718 proposes a two-component curable silicone composition containing an organopolysiloxane having alkenyl groups and an inorganic filler having a specific surface area of 50 to 500 m 2 /g. ing.
- Patent Document 3 Japanese Patent No. 37463964 proposes an addition-curable silicone gel composition containing a branched-chain organopolysiloxane having an alkenyl group, silica powder, an epoxy compound and/or a polyhydric alcohol. ing. This composition exemplifies a low-viscosity silicone gel composition with a viscosity of 10 Pa ⁇ s or less. There is a risk of property change (hardening failure) over time.
- the present invention has been made in view of the above circumstances, and the spreadability when applied to a substrate such as a control circuit board is small, and the shape change before and after heat curing and the penetration of the cured product under high temperature conditions.
- An object of the present invention is to provide a photocoupler sealed by
- the present inventors have found a silicon atom-bonded alkenyl group-containing straight-chain compound containing a specific amount of diphenylsiloxane units ((C 6 H 5 ) 2 SiO 2/2 ) in the molecule.
- the inventors have found that a product can solve the above problems, and have completed the present invention.
- the present invention provides the following thixotropic silicone gel composition for spot potting, its cured product (silicone gel), and photocoupler.
- B the following average composition formula (1) (wherein R 1 is the same or different monovalent hydrocarbon group having 1 to 10 carbon atoms and does not contain an aliphatic unsaturated bond, a is 0 or 1, and b is 0.002 to 0.002).
- component (E) is at least one selected from isocyanuric acid derivatives represented by any of the following formulas (2) to (7).
- Me represents a methyl group
- Et represents an ethyl group.
- Apparent viscosities (25° C.) are measured at a rotation speed ratio of 1:10 by a method in accordance with JIS K7117, and the SVI value obtained from the following formula is 3.0 to 10.0 [1 ] or the thixotropic silicone gel composition for spot potting according to [2].
- the thixotropic silicone gel composition for spot potting of the present invention spreads little when applied to substrates such as various electronic substrates such as control circuit substrates, changes shape before and after heat curing, and cures under high temperature conditions. Only specific semiconductor elements such as photocouplers placed on the control circuit board are covered by potting (so-called spot potting) because the change in penetration of the object (flexibility change or stress relaxation change) is small. It is useful as a silicone gel composition for encapsulating photocouplers and the like, because it can seal the device in a desired shape.
- the thixotropic silicone gel composition for spot potting of the present invention contains the following components (A) to (E) as essential components.
- the cured product of silicone gel (sometimes simply referred to as “silicone gel”) is a cured product containing organopolysiloxane as a main component and having a low cross-linking density. (1/4 cone) defined by JIS K6249 (also referred to as cone penetration) of 10 to 100. This corresponds to a rubber having such low hardness (that is, softness) and low elasticity that the measured value (rubber hardness value) is 0 in the rubber hardness measurement according to JIS K6301 and does not show an effective rubber hardness value. is different from the so-called cured silicone rubber (rubber-like elastic material).
- the present invention will be described in detail below.
- Component (A), organopolysiloxane is the main component (base polymer) of the thixotropic silicone gel composition for spot potting of the present invention, and contains bifunctional diorganosiloxane units (R 2 SiO 2 / (C 6 H 5 ) 2 SiO 2/2 units (diphenylsiloxane units) as D units represented by 2 (R is an unsubstituted or substituted monovalent hydrocarbon group) in all diorganosiloxane units in the main chain having 0.1 to 10 mol% in and having a silicon-bonded alkenyl group (hereinafter sometimes referred to as "silicon-bonded alkenyl group”) in one molecule, linear or branched (In the repeating structure of the bifunctional diorganosiloxane unit constituting the main chain, a trifunctional organosilsesquioxane unit (T unit represented by RSiO 3/2 , R is unsubstituted or a substituted monovalent
- the linear organopolysiloxane means a bifunctional diorganosiloxane unit (D unit) constituting the main chain and a monofunctional triorganosiloxy unit (R 3 SiO M units represented by 1/2 , R is an unsubstituted or substituted monovalent hydrocarbon group), and branched-chain organopolysiloxane means a trifunctional It consists of organosilsesquioxane units (T units), bifunctional diorganosiloxane units (D units) that make up the main chain, and monofunctional triorganosiloxy units (M units) that make up the ends of the molecular chains.
- T units organosilsesquioxane units
- D units bifunctional diorganosiloxane units
- M units monofunctional triorganosiloxy units
- organopolysiloxane having a branch inside, and may have a cyclic structure in the molecule.
- R here include a phenyl group, an alkenyl group to be described later, and a "silicon-bonded organic group" to be described later.
- the alkenyl group preferably has 2 to 10 carbon atoms, and specific examples include vinyl group, allyl group, propenyl group, isopropenyl group, butenyl group, isobutenyl group, pentenyl group, hexenyl group, cyclohexenyl group, A heptenyl group and the like can be mentioned, and a vinyl group is particularly preferable.
- the bonding position of the silicon-bonded alkenyl group in the organopolysiloxane molecule may be at the molecular chain terminal, at the molecular chain non-terminal (i.e., at the molecular chain side chain), or at both. good.
- the content of the silicon-bonded alkenyl group is preferably 0.001 to 10 mol/100 g, more preferably 0.002 to 1 mol/100 g, particularly preferably 0.003 to 0.1. mol/100 g, more preferably 0.004 to 0.05 mol/100 g.
- the silicon-bonded organic groups other than the silicon-bonded alkenyl groups and the phenyl groups constituting the diphenylsiloxane unit are fatty It is not particularly limited as long as it does not have an aliphatic unsaturated bond, for example, an unsubstituted or substituted carbon atom number of usually 1 to 12, preferably 1 to 10, excluding an aliphatic unsaturated bond 1 valent hydrocarbon groups, and the like.
- Examples of the unsubstituted or substituted monovalent hydrocarbon group include alkyl groups such as methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group and heptyl group; cycloalkyl groups such as cyclohexyl group; aryl groups (excluding phenyl groups) such as groups, xylyl groups and naphthyl groups; aralkyl groups such as benzyl groups and phenethyl groups; Halogenated alkyl groups such as chloromethyl group, 3-chloropropyl group, 3,3,3-trifluoropropyl group and the like substituted with a halogen atom are included.
- alkyl groups, aryl groups, and halogenated alkyl groups are preferred, methyl groups and trifluoropropyl groups are more preferred, and methyl groups are particularly preferred.
- Component (A) organopolysiloxane has (C 6 H 5 ) 2 SiO 2/2 units in all diorganopolysiloxane units consisting of repeating bifunctional diorganosiloxane units constituting the backbone of the molecular chain. is usually contained in an amount of 0.1 to 10 mol %, preferably 0.5 to 8 mol %, particularly preferably 1 to 6 mol %. If the content of (C 6 H 5 ) 2 SiO 2/2 units exceeds the upper limit of the above range, the viscosity of the resulting composition will be significantly increased and the coating workability will be reduced.
- the viscosity of component (A) at 25° C. is preferably from 100 to 100,000 mPa ⁇ s, particularly preferably from 100 to 100,000 mPa ⁇ s, because the workability of the composition and the mechanical properties of the cured product (cured product of silicone gel) are excellent. 300 to 10,000 mPa ⁇ s.
- the viscosity can be measured by a rotational viscometer (eg, BL type, BH type, BS type, cone plate type, rheometer, etc.) (hereinafter the same).
- a rotational viscometer eg, BL type, BH type, BS type, cone plate type, rheometer, etc.
- the number of silicon atoms (or the degree of polymerization) in component (A) is generally 30 to 1,200, preferably 50 to 1,000, and more preferably about 80 to 800. I wish I had.
- the degree of polymerization can be determined, for example, as the number average degree of polymerization (or number average molecular weight) in terms of polystyrene in gel permeation chromatography (GPC) analysis using toluene or the like as a developing solvent. (same as below.).
- GPC gel permeation chromatography
- component (A) is as follows. Dimethylsiloxane/diphenylsiloxane copolymer with both ends blocked with dimethylvinylsiloxy groups, dimethylsiloxane/methylvinylsiloxane/diphenylsiloxane copolymer with both ends blocked with dimethylvinylsiloxy groups, dimethylsiloxane/vinylmethylsiloxane/diphenyl with both ends blocked with trimethylsiloxy groups Siloxane copolymer, one-end trimethylsiloxy group/one-end dimethylvinylsiloxy group-blocked dimethylsiloxane/diphenylsiloxane copolymer, one-end trimethylsiloxy group/one-end dimethylvinylsiloxy group-blocked dimethylsiloxane/diphenylsiloxane/methylvinylsiloxane co-polymer Polymer, methyldivinylsiloxy group-b
- the organopolysiloxane of component (A) may be used alone or two, as long as it satisfies the condition that component (A) as a whole has an average of at least 0.5 silicon-bonded alkenyl groups per molecule. More than one species may be used in combination.
- the (B) component organohydrogenpolysiloxane used in the present invention is a component that acts as a cross-linking agent (curing agent) in the hydrosilylation addition curing reaction with the (A) component.
- Component (B) is represented by the following average composition formula (1), and in one molecule, at least hydrogen atoms bonded to silicon atoms (hereinafter also referred to as “silicon-bonded hydrogen atoms” (i.e., SiH groups))
- SiH groups silicon-bonded hydrogen atoms
- a straight-chain organohydrogenpolysiloxane containing 3, preferably 4 to 300, more preferably 5 to 100 more specifically, an organohydrogensiloxane diorganohydrogensiloxane with triorganosiloxy groups blocked at both ends of the molecular chain).
- Organosiloxane copolymer or diorganohydrogensiloxy group-blocked organohydrogensiloxane-diorganosiloxane copolymer at both ends of the molecular chain hydrogen atoms bonded to silicon atoms at non-terminal ends of the molecular chain (middle of the molecular chain) ( (SiH group) in the molecule, but may also have a hydrogen atom (SiH group) bonded to the silicon atom at the terminal of the molecular chain.
- R 1 is the same or different monovalent hydrocarbon group having 1 to 10 carbon atoms and does not contain an aliphatic unsaturated bond, a is 0 or 1, and b is 0.002 to 0.002). is a positive number of 3, and c is a positive number of 0.1 to 0.6.
- R 1 is the same or different monovalent hydrocarbon group containing no aliphatic unsaturated bonds, and usually has 1 to 10 carbon atoms, preferably 1 to 6 unsubstituted Or a monovalent hydrocarbon group that does not contain a substituted aliphatic unsaturated bond is preferable, for example, a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, an alkyl group such as a heptyl group; Cycloalkyl group; Aryl group such as phenyl group, tolyl group, xylyl group and naphthyl group; Aralkyl group such as benzyl group and phenethyl group; Part or all of the hydrogen atoms of these groups are chlorine atoms, fluorine atoms and bromine atoms and halogenated alkyl groups such as chloromethyl group, 3-chloropropy
- a is 0 or 1.
- b is 0.002 to 0.3, preferably 0.006 to 0.2, more preferably 0.013 to 0.1
- c is 0.1 to 0.6, preferably 0.1 A positive number of ⁇ 0.4. If b is less than 0.002, a cured silicone gel with the desired penetration cannot be obtained, and if b exceeds 0.3, it is difficult to obtain a cured silicone gel with a low elastic modulus and low stress. In addition, since the surface of the cured product becomes uneven, the displacement durability of the cured product is lowered.
- the molecular structure of component (B) is an organohydrogensiloxane-diorganosiloxane copolymer with triorganosiloxy group-blocked at both molecular chain ends or a diorganohydrogensiloxy group-blocked at both molecular chain ends. It is an organohydrogensiloxane/diorganosiloxane copolymer and can be represented by the following average molecular formula (1′).
- c′ is an integer of 1 to 300, preferably an integer of 2 to 50, more preferably an integer of 3 to 30, and d ' is an integer of 4 to 700, preferably an integer of 6 to 280, more preferably an integer of 15 to 120, c'+d' is an integer of 5 to 998, preferably an integer of 8 to 328, more preferably 18 It is an integer of up to 148. However, it has 3 or more SiH groups in one molecule.
- the component (B) is synthesized by a conventionally known method.
- the viscosity of the component (B) organohydrogenpolysiloxane at 25° C. is preferably 0.1 to 5,000 mPa ⁇ s, because the workability of the composition and the optical or mechanical properties of the cured product are improved. , more preferably 0.5 to 1,000 mPa ⁇ s, and particularly preferably 2 to 500 mPa ⁇ s, which is liquid at room temperature (25° C.).
- the number of silicon atoms (or the degree of polymerization) in one organohydrogenpolysiloxane molecule is usually 7 to 1,000, preferably 10 to 330, more preferably 20 to 150. degree.
- the content of hydrogen atoms (SiH groups) bonded to silicon atoms is preferably 0.0005 to 0.008 mol/g, particularly preferably 0.001 to 0.006 mol/g. is g.
- straight-chain organohydrogenpolysiloxane of component (B) include those represented by the following average compositional formula. (In each formula, Me represents a methyl group, and b and c are the same as above. However, each molecule has 3 or more SiH groups.)
- straight-chain organohydrogenpolysiloxanes as component (B) include those represented by the following average molecular formulas.
- Me represents a methyl group
- c′ and d′ are the same as above
- c′′ is an integer of 3 to 300, preferably an integer of 3 to 50, more preferably an integer of 3 to 30.
- c′′+d′ is an integer from 7 to 998, preferably an integer from 9 to 328, more preferably an integer from 18 to 148.
- the (B) component organohydrogenpolysiloxane may be used alone or in combination of two or more.
- Component (B) is added in an amount of 0.01 to 3 moles of silicon-bonded hydrogen atoms (SiH groups) in component (B) per 1 mole of silicon-bonded alkenyl groups in component (A).
- the amount is preferably 0.05 to 2 mol, more preferably 0.1 to 1.8 mol, still more preferably 0.2 to 1.5 mol, and particularly preferably 0.3 to 1.2 mol.
- the number of silicon-bonded hydrogen atoms in component (B) is less than 0.01 mol per 1 mol of silicon-bonded alkenyl groups in component (A), the cured silicone gel will have the desired penetration. cannot be obtained, and if the amount exceeds 3 mol, the cured product will not exhibit a gel state or the heat resistance will be lowered.
- the component (C) used in the present invention promotes the hydrosilylation addition reaction between the silicon-bonded alkenyl groups in the component (A) and the silicon-bonded hydrogen atoms (SiH groups) in the component (B). It is used as a catalyst for
- the component (C) is a platinum-based curing catalyst (platinum or platinum-based compound), and known catalysts can be used. Specific examples thereof include platinum black, chloroplatinic acid, alcohol-modified products of chloroplatinic acid, and platinum-based catalysts such as complexes of chloroplatinic acid with olefins, aldehydes, vinylsiloxanes, acetylene alcohols, and the like.
- the amount of component (C) may be an effective amount as a catalyst, and can be appropriately increased or decreased depending on the desired curing speed. By mass, it ranges from 0.1 to 1,000 ppm, preferably from 1 to 300 ppm. If the blending amount is too large, the heat resistance of the resulting cured product may be lowered. On the other hand, if it is too small, the hydrosilylation addition reaction may not proceed sufficiently under the prescribed curing conditions, and a gel-like cured product may not be obtained.
- the component (D) used in the present invention is an organosilazane, an organochlorosilane, an organoalkoxysilane, or an organopolysiloxane having only a methyl group as a monovalent hydrocarbon group bonded to a silicon atom. It is a fine powder silica having a surface area (BET adsorption method) of 50 to 500 m 2 /g, and when used in combination with the component (E) described later, imparts thixotropy to the composition before curing and spreads during application. It is an ingredient to make it smaller.
- Such finely divided silica exhibits sufficient thixotropic properties in the composition of the present invention by interacting with component (E), which will be described later .
- component (E) Organosilazanes, organochlorosilanes, organoalkoxysilanes having a specific surface area (BET method) of up to 400 m 2 /g and having only methyl groups as organic substituents (monovalent hydrocarbon groups) bonded to silicon atoms.
- the surface must be hydrophobicized with organopolysiloxane.
- dimethylpolysiloxane may be cyclic or linear.
- finely powdered silica examples include fumed silica (dry silica), crushed silica, fused silica, crystalline silica (quartz fine powder), precipitated silica (wet silica), colloidal silica, and the like. fumed silica is preferred in terms of particle size).
- the specific surface area (BET adsorption method) of the finely divided silica whose surface has been hydrophobized is 50 to 500 m 2 /g, preferably 50 to 400 m 2 /g. If the specific surface area is less than 50 m 2 /g, it is difficult to impart sufficient thixotropic properties to the composition, and if it exceeds 500 m 2 /g, the viscosity of the composition becomes too high and the coating workability is remarkably lowered.
- DM-30S manufactured by Tokuyama Corp.
- NSX-200 manufactured by Nippon Aerosil Co., Ltd.
- CAB- O-SIL TS-610 manufactured by Cabot Corporation, USA
- the blending amount of component (D) is in the range of 2 to 30 parts by mass, preferably 3 to 20 parts by mass, more preferably 5 to 15 parts by mass, per 100 parts by mass of component (A). If the amount of component (D) is too small, the composition cannot be imparted with sufficient thixotropic properties and spreadability during application cannot be controlled. Coating workability is lowered.
- each nitrogen atoms forming the isocyanuric acid skeleton each have one trialkoxysilyl group-substituted alkyl group on two nitrogen atoms (a total of two and/or isocyanuric acid derivatives having one alkyl group substituted with an alkenyl group or a silicon-bonded hydrogen atom (SiH group)-containing silyl group or siloxanyl group on the remaining nitrogen atom, and/or isocyanuric acid
- a trialkoxysilyl group-substituted alkyl group in the molecule selected from isocyanuric acid derivatives having one trialkoxysilyl group-substituted alkyl group on each of the three nitrogen atoms forming the acid skeleton (total of three in the molecule) is an isocyanuric acid derivative with a specific molecular structure having at least two, and without impairing the fluidity of the composition of the present invention, together with the above component
- isocyanuric acid skeleton on two nitrogen atoms in the three nitrogen atoms forming the isocyanuric acid skeleton, as represented by the following formulas (3) and (6); one trialkoxysilyl group-substituted alkyl group each (total of two in the molecule) and an isocyanuric acid derivative having one alkenyl group such as an allyl group on the remaining one nitrogen atom, (iii) trimethoxysilylpropyl groups, triethoxysilylpropyl groups, etc.
- isocyanuric acid skeleton on two nitrogen atoms in the three nitrogen atoms forming the isocyanuric acid skeleton, as represented by the following formulas (4) and (7) one trialkoxysilyl group-substituted alkyl group each (total of two in the molecule), and the remaining one nitrogen atom is bonded to a silicon atom such as [dimethyl (hydrogen) siloxy] dimethylsilylpropyl group
- Examples include isocyanuric acid derivatives having one alkyl group substituted with a hydrogen atom (SiH group)-containing silyl group or siloxanyl group.
- the alkyl group of the trialkoxysilyl group-substituted alkyl group, the silicon-bonded hydrogen atom (SiH group)-containing silyl group or the alkyl group substituted with a siloxanyl group includes an ethyl group having 2 to 10 carbon atoms. , propyl group, isopropyl group, butyl group, isobutyl group, tert-butyl group, pentyl group, neopentyl group, hexyl group, octyl group and the like, among which propyl group is preferred.
- alkoxy group of the trialkoxysilyl group-substituted alkyl group examples include methoxy group, ethoxy group, propoxy group and butoxy group having 1 to 10 carbon atoms. Among these, methoxy group and ethoxy group are preferred.
- isocyanuric acid derivatives represented by the following formulas (2) to (7) as the component (E).
- the isocyanuric acid derivative of the component (E) may be used alone or in combination of two or more.
- the blending amount of component (E) is 0.01 to 3 parts by mass, preferably 0.05 to 1 part by mass, per 100 parts by mass of component (A). If the amount is less than 0.01 parts by mass, the composition cannot be imparted with sufficient thixotropic properties, and if the amount exceeds 3 parts by mass, the viscosity increases and the coating workability is remarkably lowered.
- the thixotropic silicone gel composition for spot potting of the present invention can contain optional components within a range that does not impair the purpose of the present invention.
- the optional components include, for example, reaction inhibitors, inorganic fillers other than component (D) above, silicon-bonded hydrogen atoms (SiH groups) involved in the hydrosilylation addition reaction, and silicon-bonded alkenyl groups free of non-functional organopolysiloxane (so-called non-functional silicone oils such as dimethylpolysiloxane and dimethylsiloxane/diphenylsiloxane copolymer), adhesiveness imparting agents such as alkoxyorganosilanes that contribute to improving adhesiveness or adhesiveness, and heat-resistant additives agents, flame retardants, pigments, dyes, and the like.
- the reaction inhibitor is a component for inhibiting the reaction of the composition, and specific examples thereof include acetylene-based, amine-based, carboxylic acid ester-based, and phosphite-based reaction inhibitors. be done.
- inorganic fillers include crystalline silica other than the component (D), finely powdered silica such as precipitated silica, inorganic hollow fillers (silica hollow fillers, titanium oxide hollow fillers, etc.), silsesquioxane, and fumed dioxide.
- Inorganic fillers such as titanium, magnesium oxide, zinc oxide, iron oxide, aluminum hydroxide, magnesium carbonate, calcium carbonate, zinc carbonate, layered mica, diatomaceous earth, and glass fibers;
- Inorganic fillers surface-hydrophobicized with organosilicon compounds such as organochlorosilane compounds, organosilazane compounds, and low-molecular-weight siloxane compounds are included.
- silicone rubber powder, silicone resin powder, etc. may be blended.
- the thixotropic silicone gel composition for spot potting of the present invention can be obtained by uniformly mixing predetermined amounts of the above components (A) to (E) and other optional components.
- the components to be mixed may be divided into two or more parts as necessary and mixed, for example, part of (A) component and (C), (D), (E It is also possible to separate and mix the part consisting of the component (A) and the part consisting of the remaining component (A) and the component (B).
- the mixing means used here include a homomixer, a paddle mixer, a homodisper, a colloid mill, a vacuum mixing stirring mixer, and a planetary mixer. It is not particularly limited as long as it can be mixed.
- the apparent viscosity (25° C.) is measured by a method in accordance with JIS K7117 at a rotational speed ratio of 1:10, and the apparent viscosity (25° C.) is obtained from the following formula.
- the viscosity of the thixotropic silicone gel composition for spot potting is calculated according to JIS K7117. Apparent viscosities are measured at 25° C. with a rheometer (ARES G2, manufactured by TA Instruments) at 1 s ⁇ 1 and 10 s ⁇ 1 , and the apparent viscosities can be obtained by the following formula.
- SVI value (Apparent viscosity at a rotation speed of 1 s -1 )/(Apparent viscosity at a rotation speed of 10 s -1 )
- means for adjusting the SVI value (ratio of apparent viscosities) of the thixotropic silicone gel composition for spot potting to the above range include fine powder silica (component (D)) and/or isocyanuric acid derivative (( It can be achieved by appropriately adjusting the blending amount of component E).
- the curing conditions for the thixotropic silicone gel composition for spot potting of the present invention are 23 to 150°C, particularly 50 to 130°C, and 10 minutes to 8 hours, particularly 30 minutes to 5 hours.
- the thixotropic silicone gel composition for spot potting of the present invention is prepared by dropping 1 g of the uncured composition onto a glass plate and allowing the composition to stand in an atmosphere of 25°C for 30 minutes. and the diameter of the cured product of the composition formed on the glass plate after the glass plate onto which 1 g of the uncured composition is dropped is left in an atmosphere of 130° C. for 30 minutes is defined as D mm, Dd is preferably 3 mm or less, particularly 2 mm or less. Here, it is preferable that this diameter is the average value of the vertical direction and the horizontal direction as two orthogonal directions. If Dd exceeds 3 mm, potting may not be possible only at desired locations.
- finely powdered silica (component (D)) and/or isocyanuric acid derivative (component (E)) can be used to reduce the Dd to 3 mm or less. can be achieved by appropriately adjusting the blending amount of
- the cured silicone gel obtained by curing the thixotropic silicone gel composition for spot potting of the present invention has a penetration of 10 to 100, preferably 20 to 70, as defined by JIS K6249. If the penetration is less than 10, the adhesion to the sealed substrate may be insufficient, and if it exceeds 100, the strength of the sealing gel itself may be low and cracks may be generated during heat resistance.
- the mixing ratio of components (A) and (B) i.e., silicon-bonded alkenyl groups in component (A) can be achieved by appropriately adjusting the molar ratio of silicon-bonded hydrogen atoms (SiH groups) in component (B) to
- the cured silicone gel obtained by curing the thixotropic silicone gel composition for spot potting of the present invention had a penetration of 200% as defined in JIS K6249 immediately after curing. C. atmosphere for 72 hours, the rate of decrease in the penetration of the cured silicone gel as defined by JIS K6249 is preferably 20% or less, particularly 15% or less. If the rate of decrease exceeds 20%, cracks may occur in the cured product, or the adhesion to the substrate may be remarkably lowered.
- the blending ratio of components (A) and (B) i.e., component (B) to silicon-bonded alkenyl groups in component (A) It can be achieved by appropriately adjusting the molar ratio of silicon-bonded hydrogen atoms (SiH groups) therein and/or by blending a heat resistance improver.
- the thixotropic silicone gel composition for spot potting of the present invention has little spreadability when applied to substrates such as various electronic substrates such as control circuit substrates, and changes in shape before and after heat curing and under high temperature conditions. Since the penetration change (flexibility change or stress relaxation change) of the cured product is small, only specific semiconductor elements such as photocouplers placed on the control circuit board are covered by potting (so-called spot potting ), and the device or the like can be sealed in a desired shape. ⁇ It is useful as a sealing material for electronic parts, especially for photocouplers.
- the photocoupler of the present invention is sealed with a cured silicone gel obtained by curing the above-mentioned thixotropic silicone gel composition for spot potting of the present invention. It is useful in that it can suppress the occurrence of defects.
- parts means “mass parts”
- viscosities of the illustrated components are measured at 25°C with a rotational viscometer.
- Me represents a methyl group.
- the degree of polymerization indicates the number average degree of polymerization in terms of polystyrene in gel permeation chromatography (GPC) analysis using toluene as a developing solvent.
- GPC gel permeation chromatography
- (A) Component (A-1) Branched molecular chain terminal dimethylvinylsiloxy group/trimethylsiloxy group-blocked polysiloxane (( C 6 H 5 ) 2 SiO 2/2 units: 2 mol % in all diorganopolysiloxane units, alkenyl group content: 0.011 mol/100 g)
- A-2) Linear polysiloxane ((C 6 H 5 ) 2 SiO 2/2 units: 5 mol % of all diorganopolysiloxane units, alkenyl group content: 0.005 mol/100 g)
- the molecular chain end-blocked dimethylvinylsiloxy group/trimethylsiloxy group-blocked linear polysiloxane represented by the average molecular formula (9) has one end of the molecular chain represented by the following average molecular formula (9a) blocked with a dimethylvinylsiloxy group.
- a linear polysiloxane [9a] having one molecular chain end blocked with a trimethylsiloxy group, and a linear polysiloxane having both molecular chain ends blocked with a trimethylsiloxy group [ 9b] and [9a]:[9b] 6:4 (molar ratio ⁇ mass ratio).
- (A-3) Branched molecular chain terminal dimethylvinylsiloxy group/trimethylsiloxy group-blocked polysiloxane ((C 6 H 5 ) 2 SiO 2/2 units: 0 mol % of all diorganopolysiloxane units, alkenyl group content: 0.012 mol/100 g) [Note]
- the branched molecular chain end dimethylvinylsiloxy group/trimethylsiloxy group-blocked polysiloxane represented by the average molecular formula (10) has two molecular chain ends represented by the following average molecular formula (10a) with dimethylvinylsiloxy groups.
- a linear polysiloxane [12a] having one molecular chain end blocked with a trimethylsiloxy group and a linear polysiloxane [ 12b] and [12a]:[12b] 6:4 (molar ratio ⁇ mass ratio).
- a linear polysiloxane [13a] having one molecular chain end blocked with a trimethylsiloxy group, and a linear polysiloxane [ 13b] and [13a]:[13b] 6:4 (molar ratio ⁇ mass ratio).
- D-1 Component (D-1) Fumed silica having a BET specific surface area of 300 m 2 /g and surface-treated with dimethyldichlorosilane (trade name: DM-30S, manufactured by Tokuyama Corporation)
- E-3) 3-glycidoxypropyltrimethoxysilane (trade name: KBM-403, manufactured by Shin-Etsu Chemical Co., Ltd.)
- E-4) 8-glycidyloxyoctyltrimethoxysilane (trade name: KBM-4803, manufactured by Shin-Etsu Chemical Co., Ltd.)
- E-5) A methoxy group-containing siloxane oligomer having a methoxy group content of 28% by mass and a viscosity of 25 mPa s at 25°C (trade name: KR-500, manufactured by Shin-Etsu Chemical Co., Ltd.)
- Examples 1 to 4 Comparative Examples 1 to 7
- the above components (A) to (E) were compounded and mixed as shown in Tables 1 and 2 to prepare silicone gel compositions S1 to S11.
- the viscosity of these silicone gel compositions was measured with the rheometer described above to calculate the SVI value.
- changes in spreadability before and after curing were checked by the method described above.
- the heat resistance of the cured products of these silicone gel compositions was evaluated by the method described above. The above results are also shown in Tables 1 and 2.
- the silicone gel compositions of Examples 1 to 4 satisfy the requirements of the present invention. Therefore, it is useful for spot potting on sealing elements.
- the silicone gel since the change in penetration in an atmosphere of 200°C is small and the silicone gel has good heat resistance, cracking of the cured silicone gel is suppressed even during high-temperature operation, so the load on the sealing element is small. It has the characteristics of
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Abstract
Description
[1]
(A)主鎖中のジオルガノシロキサン単位として、(C6H5)2SiO2/2単位を主鎖中の全ジオルガノシロキサン単位中に0.1~10モル%有し、ケイ素原子に結合したアルケニル基を0.001~10モル/100g有する直鎖状又は分岐鎖状オルガノポリシロキサン:100質量部、
(B)下記平均組成式(1)
で示され、1分子中に少なくとも3個のケイ素原子に結合した水素原子を含有するオルガノハイドロジェンポリシロキサン:前記(A)成分中のアルケニル基1モルに対し(B)成分中のケイ素原子に結合した水素原子が0.01~3モルとなる量、
(C)白金系硬化触媒:触媒としての有効量、
(D)ケイ素原子に結合した一価炭化水素基としてメチル基のみを有するオルガノシラザン、オルガノクロロシラン、オルガノアルコキシシランもしくはオルガノポリシロキサンにより表面が疎水化処理され、比表面積(BET吸着法)が50~500m2/gである微粉末シリカ:2~30質量部、及び
(E)イソシアヌル酸骨格を形成する3個の窒素原子において、2個の窒素原子上にトリアルコキシシリル基置換アルキル基をそれぞれ1個ずつ(分子中に合計2個)と残余の1個の窒素原子上にアルケニル基又はケイ素原子に結合した水素原子(SiH基)含有シリル基又はシロキサニル基で置換されたアルキル基を1個有するイソシアヌル酸誘導体、及び/又はイソシアヌル酸骨格を形成する3個の窒素原子上にトリアルコキシシリル基置換アルキル基をそれぞれ1個ずつ(分子中に合計3個)有するイソシアヌル酸誘導体:0.01~3質量部
を含有してなり、硬化して、JIS K6249で規定される針入度が10~100であるシリコーンゲル硬化物を与えるものであるスポットポッティング用チキソ性シリコーンゲル組成物。
[2]
(E)成分が、下記式(2)~(7)のいずれかで示されるイソシアヌル酸誘導体から選ばれる少なくとも1種である[1]に記載のスポットポッティング用シリコーンゲル組成物。
[3]
JIS K7117に準拠する方法により回転数比が1:10になる回転数で見掛け粘度(25℃)をそれぞれ測定し、以下の式から求められるSVI値が3.0~10.0である[1]又は[2]に記載のスポットポッティング用チキソ性シリコーンゲル組成物。
SVI値=(低い方の回転数における見掛け粘度)/(高い方の回転数における見掛け粘度)
[4]
未硬化の組成物1gをガラス板上に滴下し25℃雰囲気下で30分放置した後に該組成物が形成する液滴の直径をdmmとし、前記未硬化の組成物1gを滴下したガラス板を130℃雰囲気下で30分放置した後に該ガラス板上に形成される該組成物の硬化物の直径をDmmとそれぞれ定義した場合において、D-dが3mm以下である[1]~[3]のいずれかに記載のスポットポッティング用チキソ性シリコーンゲル組成物。
[5]
未硬化の組成物を硬化させてなるシリコーンゲル硬化物の硬化直後の針入度に対して、該シリコーンゲル硬化物を200℃雰囲気下で72時間放置した後の該シリコーンゲル硬化物の針入度の減少率が20%以下である[1]~[4]のいずれかに記載のスポットポッティング用チキソ性シリコーンゲル組成物。
[6]
[1]~[5]のいずれかに記載のスポットポッティング用チキソ性シリコーンゲル組成物を硬化させてなるシリコーンゲル硬化物。
[7]
[6]に記載のシリコーンゲル硬化物で封止されたフォトカプラ。
以下、本発明を詳細に説明する。
(A)成分のオルガノポリシロキサンは、本発明のスポットポッティング用チキソ性シリコーンゲル組成物の主剤(ベースポリマー)であり、主鎖を構成する2官能性のジオルガノシロキサン単位(R2SiO2/2で示されるD単位、Rは非置換又は置換の1価炭化水素基)として、(C6H5)2SiO2/2単位(ジフェニルシロキサン単位)を主鎖中の全ジオルガノシロキサン単位中に0.1~10モル%有し、かつ、1分子中にケイ素原子に結合したアルケニル基(以下、「ケイ素原子結合アルケニル基」という場合がある。)を有する、直鎖状又は分岐鎖状の(主鎖を構成する2官能性のジオルガノシロキサン単位の繰り返し構造中に、分岐点である3官能性のオルガノシルセスキオキサン単位(RSiO3/2で示されるT単位、Rは非置換又は置換の1価炭化水素基)を少量、例えば1~5個、好ましくは1~3個程度有する)オルガノポリシロキサン(即ち、分子中に特定量のジフェニルシロキサン単位を必須に有する直鎖状又は分岐鎖状のアルケニル基含有オルガノポリシロキサン)である。
なお、本発明において、直鎖状オルガノポリシロキサンとは、主鎖を構成する2官能性のジオルガノシロキサン単位(D単位)と分子鎖末端を構成する単官能性トリオルガノシロキシ単位(R3SiO1/2で示されるM単位、Rは非置換又は置換の1価炭化水素基)のみからなるオルガノポリシロキサンを意味し、分岐鎖状オルガノポリシロキサンとは、分岐点を構成する3官能性のオルガノシルセスキオキサン単位(T単位)、主鎖を構成する2官能性のジオルガノシロキサン単位(D単位)と分子鎖末端を構成する単官能性トリオルガノシロキシ単位(M単位)からなり、分子中に分岐を有するオルガノポリシロキサンを意味し、分子中に環状構造を有していてもよい。
ここでいうRとしては、フェニル基、後述するアルケニル基、及び後述する「ケイ素原子結合有機基」を例示することができる。
(A)成分中、前記ケイ素原子結合アルケニル基の含有量は、好ましくは0.001~10モル/100g、より好ましくは0.002~1モル/100g、特に好ましくは0.003~0.1モル/100g、更に好ましくは0.004~0.05モル/100gである。
両末端ジメチルビニルシロキシ基封鎖ジメチルシロキサン・ジフェニルシロキサン共重合体、両末端ジメチルビニルシロキシ基封鎖ジメチルシロキサン・メチルビニルシロキサン・ジフェニルシロキサン共重合体、両末端トリメチルシロキシ基封鎖ジメチルシロキサン・ビニルメチルシロキサン・ジフェニルシロキサン共重合体、片末端トリメチルシロキシ基・片末端ジメチルビニルシロキシ基封鎖ジメチルシロキサン・ジフェニルシロキサン共重合体、片末端トリメチルシロキシ基・片末端ジメチルビニルシロキシ基封鎖ジメチルシロキサン・ジフェニルシロキサン・メチルビニルシロキサン共重合体、両末端メチルジビニルシロキシ基封鎖ジメチルシロキサン・ジフェニルシロキサン共重合体、両末端メチルジビニルシロキシ基封鎖ジメチルシロキサン・メチルビニルシロキサン・ジフェニルシロキサン共重合体、両末端トリビニルシロキシ基封鎖ジメチルシロキサン・ジフェニルシロキサン共重合体、両末端トリビニルシロキシ基封鎖ジメチルシロキサン・メチルビニルシロキサン・ジフェニルシロキサン共重合体などの分子鎖両末端トリオルガノシロキシ基封鎖ジオルガノポリシロキサンや、これらの直鎖状ジオルガノポリシロキサン中の主鎖を構成する2官能性ジオルガノシロキサン単位の1~5個、好ましくは1~3個、より好ましくは1個又は2個が分岐構造(3官能性オルガノシルセスキオキサン単位)で置換された分岐鎖状(一部分岐を有する直鎖状)オルガノポリシロキサン等が挙げられる。
本発明に使用される(B)成分のオルガノハイドロジェンポリシロキサンは、(A)成分とのヒドロシリル化付加硬化反応において、架橋剤(硬化剤)として作用する成分である。(B)成分は、下記平均組成式(1)で示され、1分子中に、ケイ素原子に結合した水素原子(以下、「ケイ素原子結合水素原子」(即ち、SiH基)ともいう)を少なくとも3個、好ましくは4~300個、より好ましくは5~100個含有する直鎖状のオルガノハイドロジェンポリシロキサン(より具体的には、分子鎖両末端トリオルガノシロキシ基封鎖オルガノハイドロジェンシロキサン・ジオルガノシロキサン共重合体又は分子鎖両末端ジオルガノハイドロジェンシロキシ基封鎖オルガノハイドロジェンシロキサン・ジオルガノシロキサン共重合体)であり、分子鎖非末端(分子鎖途中)のケイ素原子に結合した水素原子(SiH基)を分子中に必須に有するものであるが、更に、分子鎖末端のケイ素原子に結合した水素原子(SiH基)を併せて有するものであってもよい。
また、(B)成分は、従来公知の方法で合成されるものである。
また、(B)成分中、前記ケイ素原子に結合した水素原子(SiH基)の含有量は、好ましくは0.0005~0.008モル/g、特に好ましくは0.001~0.006モル/gである。
本発明に使用される(C)成分は、前記(A)成分中のケイ素原子結合アルケニル基と前記(B)成分中のケイ素原子結合水素原子(SiH基)とのヒドロシリル化付加反応を促進させるための触媒として使用されるものである。該(C)成分は白金系硬化触媒(白金又は白金系化合物)であり、公知のものを使用することができる。その具体例としては、白金ブラック、塩化白金酸、塩化白金酸等のアルコール変性物;塩化白金酸とオレフィン、アルデヒド、ビニルシロキサン又はアセチレンアルコール類等との錯体などの白金系触媒が例示される。
本発明に使用される(D)成分は、ケイ素原子に結合した一価炭化水素基としてメチル基のみを有するオルガノシラザン、オルガノクロロシラン、オルガノアルコキシシランもしくはオルガノポリシロキサンにより表面が疎水化処理された比表面積(BET吸着法)が50~500m2/gである微粉末シリカであり、後述する(E)成分との併用により、硬化前の組成物にチキソ性を付与し、塗布時の広がり性を小さくするための成分である。かかる微粉末シリカは、後述する(E)成分との相互作用により本発明の組成物に十分なチキソ性を発現せしめるものであるが、このためには、50~500m2/g、好ましくは50~400m2/gの比表面積(BET法)を有していること、及びケイ素原子に結合した有機置換基(一価炭化水素基)としてメチル基のみを有するオルガノシラザン、オルガノクロロシラン、オルガノアルコキシシランもしくはオルガノポリシロキサンによりその表面が疎水化処理されていることが必要である。
本発明に使用される(E)成分は、イソシアヌル酸骨格を形成する3個の窒素原子において、2個の窒素原子上にトリアルコキシシリル基置換アルキル基をそれぞれ1個ずつ(分子中に合計2個)と残余の1個の窒素原子上にアルケニル基又はケイ素原子に結合した水素原子(SiH基)含有シリル基又はシロキサニル基で置換されたアルキル基を1個有するイソシアヌル酸誘導体、及び/又はイソシアヌル酸骨格を形成する3個の窒素原子上にトリアルコキシシリル基置換アルキル基をそれぞれ1個ずつ(分子中に合計3個)有するイソシアヌル酸誘導体から選ばれる、分子中にトリアルコキシシリル基置換アルキル基を少なくとも2個有する特定分子構造のイソシアヌル酸誘導体であり、本発明の組成物の流動性を損なうことなく、上記(D)成分と共に、本発明の組成物にチキソ性を付与し、塗布時の広がり性を小さくするための成分である。
下記式(2)、(5)で示されるような、(i)イソシアヌル酸骨格を形成する3個の窒素原子上にトリメトキシシリルプロピル基、トリエトキシシリルプロピル基等のトリアルコキシシリル基置換アルキル基をそれぞれ1個ずつ(分子中に合計3個)有するイソシアヌル酸誘導体、
下記式(3)、(6)で示されるような、(ii)イソシアヌル酸骨格を形成する3個の窒素原子において、2個の窒素原子上にトリメトキシシリルプロピル基、トリエトキシシリルプロピル基等のトリアルコキシシリル基置換アルキル基をそれぞれ1個ずつ(分子中に合計2個)と、残余の1個の窒素原子上にアリル基等のアルケニル基を1個有するイソシアヌル酸誘導体、
下記式(4)、(7)で示されるような、(iii)イソシアヌル酸骨格を形成する3個の窒素原子において、2個の窒素原子上にトリメトキシシリルプロピル基、トリエトキシシリルプロピル基等のトリアルコキシシリル基置換アルキル基をそれぞれ1個ずつ(分子中に合計2個)と、残余の1個の窒素原子上に[ジメチル(ハイドロジェン)シロキシ]ジメチルシリルプロピル基等のケイ素原子に結合した水素原子(SiH基)含有シリル基又はシロキサニル基で置換されたアルキル基を1個有するイソシアヌル酸誘導体等を例示することができる。
また、上記トリアルコキシシリル基置換アルキル基のアルコキシ基としては、炭素原子数1~10のメトキシ基、エトキシ基、プロポキシ基、ブトキシ基等が挙げられ、これらの中でもメトキシ基、エトキシ基が好ましい。
SVI値=(低い方の回転数における見掛け粘度)/(高い方の回転数における見掛け粘度)
SVI値=(回転速度1s-1における見掛け粘度)/(回転速度10s-1における見掛け粘度)
なお、本発明のスポットポッティング用チキソ性シリコーンゲル組成物において、上記D-dを3mm以下とする手段としては、微粉末シリカ((D)成分)及び/又はイソシアヌル酸誘導体((E)成分)の配合量等を適宜調整することにより達成することができる。
なお、本発明において、上記シリコーンゲル硬化物の針入度を上記範囲とする手段としては、(A)成分と(B)成分の配合比率(即ち、(A)成分中のケイ素原子結合アルケニル基に対する(B)成分中のケイ素原子結合水素原子(SiH基)のモル比)等を適宜調整することにより達成することができる。
なお、本発明において、上記減少率を20%以下とする手段としては、(A)成分と(B)成分の配合比率(即ち、(A)成分中のケイ素原子結合アルケニル基に対する(B)成分中のケイ素原子結合水素原子(SiH基)のモル比)を適宜調整することにより、及び/又は耐熱性向上剤を配合することにより達成することができる。
本発明のフォトカプラは、上述した本発明のスポットポッティング用チキソ性シリコーンゲル組成物を硬化してなるシリコーンゲル硬化物で封止されてなるものであり、設計通りのポッティングが可能なため、不具合品の発生を抑制できる点で有用である。
シリコーンゲル組成物の粘度をJIS K7117に準拠する方法により測定した。即ち、シリコーンゲル組成物をレオメータ(TAインスツルメント社製ARES G2)により、25℃で回転速度比が1:10になる回転速度(1s-1と10s-1)における見掛け粘度を各々測定し、下式によりSVI値を求めた。
SVI値=(回転速度1s-1における見掛け粘度)/(回転速度10s-1における見掛け粘度)
シリコーンゲル組成物を5mlのマイクロシリンジに約5g採取し、50mm×50mmのガラス板の中央部に、1g分をゆっくり吐出した。25℃雰囲気下で30分放置後に、円形に広がったシリコーンゲル組成物の直径を直交する2方向として縦方向・横方向それぞれ測定し、その平均値を求めた。この値を硬化前の広がり性の指標とした。
上記のシリコーンゲル組成物を塗布したガラス板を、130℃のオーブン中で30分間加熱することにより硬化させた。このとき得られたシリコーンゲル硬化物の直径を直交する2方向として縦方向・横方向それぞれ測定し、その平均値を求めた。この値を硬化時の広がり性の指標とした。上記で測定した硬化時の広がり性と硬化前の広がり性の差を求めた。
シリコーンゲル組成物を130℃で30分加熱して、サイズ:直径約40mm、厚さ約20mmの円筒状シリコーンゲル硬化物を得た。このときの針入度を測定し、これを硬化初期の値とした。なお、針入度はJIS K6249で規定されるJIS K2220のちょう度試験方法(1/4コーン)にて、測定を行った。上記で得られたシリコーンゲル硬化物を、200℃雰囲気下で72時間暴露し、得られたサンプルの針入度を測定した。これを200℃耐熱後の針入度とした。
(A-1)下記平均分子式(8)で示される、25℃における粘度が約1Pa・sである分岐鎖状の分子鎖末端ジメチルビニルシロキシ基・トリメチルシロキシ基封鎖ポリシロキサン((C6H5)2SiO2/2単位:全ジオルガノポリシロキサン単位中2モル%、アルケニル基含有量:0.011モル/100g)
上記平均分子式(9)で示される分子鎖末端ジメチルビニルシロキシ基・トリメチルシロキシ基封鎖直鎖状ポリシロキサンは、下記平均分子式(9a)で示される分子鎖片末端がジメチルビニルシロキシ基で封鎖され他方の分子鎖片末端がトリメチルシロキシ基で封鎖された直鎖状ポリシロキサン[9a]と、下記平均分子式(9b)で示される分子鎖両末端がトリメチルシロキシ基で封鎖された直鎖状ポリシロキサン[9b]との、[9a]:[9b]=6:4(モル比≒質量比)の均一混合物である。
上記平均分子式(10)で示される分岐鎖状の分子鎖末端ジメチルビニルシロキシ基・トリメチルシロキシ基封鎖ポリシロキサンは、下記平均分子式(10a)で示される2個の分子鎖末端がジメチルビニルシロキシ基で封鎖された分岐鎖状ポリシロキサン[10a]と、下記平均分子式(10b)で示される2個の分子鎖末端がトリメチルシロキシ基で封鎖された分岐鎖状ポリシロキサン[10b]との、[10a]:[10b]=4:6(モル比≒質量比)の均一混合物である。
上記平均分子式(12)で示される分子鎖末端ジメチルビニルシロキシ基・トリメチルシロキシ基封鎖直鎖状ポリシロキサンは、下記平均分子式(12a)で示される分子鎖片末端がジメチルビニルシロキシ基で封鎖され他方の分子鎖片末端がトリメチルシロキシ基で封鎖された直鎖状ポリシロキサン[12a]と、下記平均分子式(12b)で示される分子鎖両末端がトリメチルシロキシ基で封鎖された直鎖状ポリシロキサン[12b]との、[12a]:[12b]=6:4(モル比≒質量比)の均一混合物である。
上記平均分子式(13)で示される分子鎖末端ジメチルビニルシロキシ基・トリメチルシロキシ基封鎖直鎖状ポリシロキサンは、下記平均分子式(13a)で示される分子鎖片末端がジメチルビニルシロキシ基で封鎖され他方の分子鎖片末端がトリメチルシロキシ基で封鎖された直鎖状ポリシロキサン[13a]と、下記平均分子式(13b)で示される分子鎖両末端がトリメチルシロキシ基で封鎖された直鎖状ポリシロキサン[13b]との、[13a]:[13b]=6:4(モル比≒質量比)の均一混合物である。
(D-1)BET比表面積が300m2/gで、ジメチルジクロロシランで表面処理されたヒュームドシリカ(商品名:DM-30S、(株)トクヤマ製)
(D-2)BET比表面積が140m2/gで、トリメチルクロロシランで表面処理されたヒュームドシリカ(商品名:NSX-200、日本アエロジル(株)製)
(E-4)8-グリシジルオキシオクチルトリメトキシシラン(商品名:KBM-4803、信越化学工業(株)製)
(E-5)メトキシ基量28質量%、25℃における粘度が25mPa・sのメトキシ基含有シロキサンオリゴマー(商品名:KR-500、信越化学工業(株)製)
上記(A)~(E)成分を表1、2の通り配合混合し、シリコーンゲル組成物S1~S11を調製した。これらのシリコーンゲル組成物の粘度を、上記に記載のレオメータにて測定し、SVI値を算出した。また、これらのシリコーンゲル組成物について、上述した方法により硬化前後における広がり性の変化を確認した。更に、これらのシリコーンゲル組成物の硬化物について、上述した方法により、耐熱性を評価した。以上の結果を表1、2に併記する。
Claims (7)
- (A)主鎖中のジオルガノシロキサン単位として、(C6H5)2SiO2/2単位を主鎖中の全ジオルガノシロキサン単位中に0.1~10モル%有し、ケイ素原子に結合したアルケニル基を0.001~10モル/100g有する直鎖状又は分岐鎖状オルガノポリシロキサン:100質量部、
(B)下記平均組成式(1)
で示され、1分子中に少なくとも3個のケイ素原子に結合した水素原子を含有するオルガノハイドロジェンポリシロキサン:前記(A)成分中のアルケニル基1モルに対し(B)成分中のケイ素原子に結合した水素原子が0.01~3モルとなる量、
(C)白金系硬化触媒:触媒としての有効量、
(D)ケイ素原子に結合した一価炭化水素基としてメチル基のみを有するオルガノシラザン、オルガノクロロシラン、オルガノアルコキシシランもしくはオルガノポリシロキサンにより表面が疎水化処理され、比表面積(BET吸着法)が50~500m2/gである微粉末シリカ:2~30質量部、及び
(E)イソシアヌル酸骨格を形成する3個の窒素原子において、2個の窒素原子上にトリアルコキシシリル基置換アルキル基をそれぞれ1個ずつ(分子中に合計2個)と残余の1個の窒素原子上にアルケニル基又はケイ素原子に結合した水素原子(SiH基)含有シリル基又はシロキサニル基で置換されたアルキル基を1個有するイソシアヌル酸誘導体、及び/又はイソシアヌル酸骨格を形成する3個の窒素原子上にトリアルコキシシリル基置換アルキル基をそれぞれ1個ずつ(分子中に合計3個)有するイソシアヌル酸誘導体:0.01~3質量部
を含有してなり、硬化して、JIS K6249で規定される針入度が10~100であるシリコーンゲル硬化物を与えるものであるスポットポッティング用チキソ性シリコーンゲル組成物。 - JIS K7117に準拠する方法により回転数比が1:10になる回転数で見掛け粘度(25℃)をそれぞれ測定し、以下の式から求められるSVI値が3.0~10.0である請求項1又は2に記載のスポットポッティング用チキソ性シリコーンゲル組成物。
SVI値=(低い方の回転数における見掛け粘度)/(高い方の回転数における見掛け粘度) - 未硬化の組成物1gをガラス板上に滴下し25℃雰囲気下で30分放置した後に該組成物が形成する液滴の直径をdmmとし、前記未硬化の組成物1gを滴下したガラス板を130℃雰囲気下で30分放置した後に該ガラス板上に形成される該組成物の硬化物の直径をDmmとそれぞれ定義した場合において、D-dが3mm以下である請求項1~3のいずれか1項に記載のスポットポッティング用チキソ性シリコーンゲル組成物。
- 未硬化の組成物を硬化させてなるシリコーンゲル硬化物の硬化直後の針入度に対して、該シリコーンゲル硬化物を200℃雰囲気下で72時間放置した後の該シリコーンゲル硬化物の針入度の減少率が20%以下である請求項1~4のいずれか1項に記載のスポットポッティング用チキソ性シリコーンゲル組成物。
- 請求項1~5のいずれか1項に記載のスポットポッティング用チキソ性シリコーンゲル組成物を硬化させてなるシリコーンゲル硬化物。
- 請求項6に記載のシリコーンゲル硬化物で封止されたフォトカプラ。
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