WO2022224926A1 - 透明なゴム変性スチレン系樹脂組成物 - Google Patents
透明なゴム変性スチレン系樹脂組成物 Download PDFInfo
- Publication number
- WO2022224926A1 WO2022224926A1 PCT/JP2022/018013 JP2022018013W WO2022224926A1 WO 2022224926 A1 WO2022224926 A1 WO 2022224926A1 JP 2022018013 W JP2022018013 W JP 2022018013W WO 2022224926 A1 WO2022224926 A1 WO 2022224926A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rubber
- resin composition
- styrene
- styrenic resin
- modified styrenic
- Prior art date
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- 239000011342 resin composition Substances 0.000 title claims abstract description 51
- 125000003011 styrenyl group Chemical class [H]\C(*)=C(/[H])C1=C([H])C([H])=C([H])C([H])=C1[H] 0.000 title description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims abstract description 59
- 239000000178 monomer Substances 0.000 claims abstract description 37
- 239000002245 particle Substances 0.000 claims abstract description 26
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229920001577 copolymer Polymers 0.000 claims abstract description 16
- 238000005984 hydrogenation reaction Methods 0.000 claims abstract description 5
- 229920001890 Novodur Polymers 0.000 claims description 44
- 229920000642 polymer Polymers 0.000 claims description 25
- 229920006249 styrenic copolymer Polymers 0.000 claims description 14
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 11
- 229920001971 elastomer Polymers 0.000 abstract description 18
- 150000003440 styrenes Chemical class 0.000 abstract description 8
- 238000006116 polymerization reaction Methods 0.000 description 22
- 239000000243 solution Substances 0.000 description 17
- 239000005060 rubber Substances 0.000 description 16
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 14
- -1 acrylic ester Chemical class 0.000 description 10
- 229920005989 resin Polymers 0.000 description 10
- 239000011347 resin Substances 0.000 description 10
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 239000006228 supernatant Substances 0.000 description 9
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 8
- 239000002904 solvent Substances 0.000 description 8
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 7
- 238000001746 injection moulding Methods 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 230000008961 swelling Effects 0.000 description 7
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 6
- YNQLUTRBYVCPMQ-UHFFFAOYSA-N Ethylbenzene Chemical compound CCC1=CC=CC=C1 YNQLUTRBYVCPMQ-UHFFFAOYSA-N 0.000 description 6
- QZRGKCOWNLSUDK-UHFFFAOYSA-N Iodochlorine Chemical compound ICl QZRGKCOWNLSUDK-UHFFFAOYSA-N 0.000 description 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- 238000010908 decantation Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 239000003505 polymerization initiator Substances 0.000 description 6
- NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Chemical compound [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 description 5
- 229920005669 high impact polystyrene Polymers 0.000 description 5
- 239000004797 high-impact polystyrene Substances 0.000 description 5
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 4
- 238000005227 gel permeation chromatography Methods 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 239000012986 chain transfer agent Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 3
- 239000008188 pellet Substances 0.000 description 3
- 229920002554 vinyl polymer Polymers 0.000 description 3
- HSLFISVKRDQEBY-UHFFFAOYSA-N 1,1-bis(tert-butylperoxy)cyclohexane Chemical compound CC(C)(C)OOC1(OOC(C)(C)C)CCCCC1 HSLFISVKRDQEBY-UHFFFAOYSA-N 0.000 description 2
- 238000001644 13C nuclear magnetic resonance spectroscopy Methods 0.000 description 2
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 2
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 description 2
- 239000005062 Polybutadiene Substances 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- MOYAFQVGZZPNRA-UHFFFAOYSA-N Terpinolene Chemical compound CC(C)=C1CCC(C)=CC1 MOYAFQVGZZPNRA-UHFFFAOYSA-N 0.000 description 2
- 239000003963 antioxidant agent Substances 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000011088 calibration curve Methods 0.000 description 2
- 238000005119 centrifugation Methods 0.000 description 2
- 238000007334 copolymerization reaction Methods 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000005469 granulation Methods 0.000 description 2
- 230000003179 granulation Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 229920002857 polybutadiene Polymers 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 2
- 235000019345 sodium thiosulphate Nutrition 0.000 description 2
- SWAXTRYEYUTSAP-UHFFFAOYSA-N tert-butyl ethaneperoxoate Chemical compound CC(=O)OOC(C)(C)C SWAXTRYEYUTSAP-UHFFFAOYSA-N 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- QEQBMZQFDDDTPN-UHFFFAOYSA-N (2-methylpropan-2-yl)oxy benzenecarboperoxoate Chemical compound CC(C)(C)OOOC(=O)C1=CC=CC=C1 QEQBMZQFDDDTPN-UHFFFAOYSA-N 0.000 description 1
- KDGNCLDCOVTOCS-UHFFFAOYSA-N (2-methylpropan-2-yl)oxy propan-2-yl carbonate Chemical compound CC(C)OC(=O)OOC(C)(C)C KDGNCLDCOVTOCS-UHFFFAOYSA-N 0.000 description 1
- ZUDLIFVTNPYZJH-UHFFFAOYSA-N 1,1,2,2-tetraphenylethylbenzene Chemical compound C1=CC=CC=C1C(C(C=1C=CC=CC=1)(C=1C=CC=CC=1)C=1C=CC=CC=1)C1=CC=CC=C1 ZUDLIFVTNPYZJH-UHFFFAOYSA-N 0.000 description 1
- IMYCVFRTNVMHAD-UHFFFAOYSA-N 1,1-bis(2-methylbutan-2-ylperoxy)cyclohexane Chemical compound CCC(C)(C)OOC1(OOC(C)(C)CC)CCCCC1 IMYCVFRTNVMHAD-UHFFFAOYSA-N 0.000 description 1
- OEVVKKAVYQFQNV-UHFFFAOYSA-N 1-ethenyl-2,4-dimethylbenzene Chemical compound CC1=CC=C(C=C)C(C)=C1 OEVVKKAVYQFQNV-UHFFFAOYSA-N 0.000 description 1
- NVZWEEGUWXZOKI-UHFFFAOYSA-N 1-ethenyl-2-methylbenzene Chemical compound CC1=CC=CC=C1C=C NVZWEEGUWXZOKI-UHFFFAOYSA-N 0.000 description 1
- JZHGRUMIRATHIU-UHFFFAOYSA-N 1-ethenyl-3-methylbenzene Chemical compound CC1=CC=CC(C=C)=C1 JZHGRUMIRATHIU-UHFFFAOYSA-N 0.000 description 1
- ZHKBLALOBMBJLL-UHFFFAOYSA-N 1-hexylperoxyhexane Chemical compound CCCCCCOOCCCCCC ZHKBLALOBMBJLL-UHFFFAOYSA-N 0.000 description 1
- QEDJMOONZLUIMC-UHFFFAOYSA-N 1-tert-butyl-4-ethenylbenzene Chemical compound CC(C)(C)C1=CC=C(C=C)C=C1 QEDJMOONZLUIMC-UHFFFAOYSA-N 0.000 description 1
- HQOVXPHOJANJBR-UHFFFAOYSA-N 2,2-bis(tert-butylperoxy)butane Chemical compound CC(C)(C)OOC(C)(CC)OOC(C)(C)C HQOVXPHOJANJBR-UHFFFAOYSA-N 0.000 description 1
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 description 1
- GOXQRTZXKQZDDN-UHFFFAOYSA-N 2-Ethylhexyl acrylate Chemical compound CCCCC(CC)COC(=O)C=C GOXQRTZXKQZDDN-UHFFFAOYSA-N 0.000 description 1
- RCEJCSULJQNRQQ-UHFFFAOYSA-N 2-methylbutanenitrile Chemical compound CCC(C)C#N RCEJCSULJQNRQQ-UHFFFAOYSA-N 0.000 description 1
- LWZNQGJGMBRAII-UHFFFAOYSA-N 2-methylhexyl prop-2-enoate Chemical compound CCCCC(C)COC(=O)C=C LWZNQGJGMBRAII-UHFFFAOYSA-N 0.000 description 1
- BIISIZOQPWZPPS-UHFFFAOYSA-N 2-tert-butylperoxypropan-2-ylbenzene Chemical compound CC(C)(C)OOC(C)(C)C1=CC=CC=C1 BIISIZOQPWZPPS-UHFFFAOYSA-N 0.000 description 1
- FRIBMENBGGCKPD-UHFFFAOYSA-N 3-(2,3-dimethoxyphenyl)prop-2-enal Chemical compound COC1=CC=CC(C=CC=O)=C1OC FRIBMENBGGCKPD-UHFFFAOYSA-N 0.000 description 1
- JLBJTVDPSNHSKJ-UHFFFAOYSA-N 4-Methylstyrene Chemical compound CC1=CC=C(C=C)C=C1 JLBJTVDPSNHSKJ-UHFFFAOYSA-N 0.000 description 1
- 206010001497 Agitation Diseases 0.000 description 1
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 1
- JIGUQPWFLRLWPJ-UHFFFAOYSA-N Ethyl acrylate Chemical compound CCOC(=O)C=C JIGUQPWFLRLWPJ-UHFFFAOYSA-N 0.000 description 1
- 239000004605 External Lubricant Substances 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000004610 Internal Lubricant Substances 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 150000001338 aliphatic hydrocarbons Chemical class 0.000 description 1
- 150000004996 alkyl benzenes Chemical class 0.000 description 1
- XYLMUPLGERFSHI-UHFFFAOYSA-N alpha-Methylstyrene Chemical compound CC(=C)C1=CC=CC=C1 XYLMUPLGERFSHI-UHFFFAOYSA-N 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 229920001400 block copolymer Polymers 0.000 description 1
- MPMBRWOOISTHJV-UHFFFAOYSA-N but-1-enylbenzene Chemical compound CCC=CC1=CC=CC=C1 MPMBRWOOISTHJV-UHFFFAOYSA-N 0.000 description 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- VBWIZSYFQSOUFQ-UHFFFAOYSA-N cyclohexanecarbonitrile Chemical compound N#CC1CCCCC1 VBWIZSYFQSOUFQ-UHFFFAOYSA-N 0.000 description 1
- FWLDHHJLVGRRHD-UHFFFAOYSA-N decyl prop-2-enoate Chemical compound CCCCCCCCCCOC(=O)C=C FWLDHHJLVGRRHD-UHFFFAOYSA-N 0.000 description 1
- LSXWFXONGKSEMY-UHFFFAOYSA-N di-tert-butyl peroxide Chemical compound CC(C)(C)OOC(C)(C)C LSXWFXONGKSEMY-UHFFFAOYSA-N 0.000 description 1
- WNAHIZMDSQCWRP-UHFFFAOYSA-N dodecane-1-thiol Chemical compound CCCCCCCCCCCCS WNAHIZMDSQCWRP-UHFFFAOYSA-N 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229920000578 graft copolymer Polymers 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 150000002432 hydroperoxides Chemical class 0.000 description 1
- 238000009863 impact test Methods 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- MMSLOZQEMPDGPI-UHFFFAOYSA-N p-Mentha-1,3,5,8-tetraene Chemical compound CC(=C)C1=CC=C(C)C=C1 MMSLOZQEMPDGPI-UHFFFAOYSA-N 0.000 description 1
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- FZYCEURIEDTWNS-UHFFFAOYSA-N prop-1-en-2-ylbenzene Chemical compound CC(=C)C1=CC=CC=C1.CC(=C)C1=CC=CC=C1 FZYCEURIEDTWNS-UHFFFAOYSA-N 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- FVSKHRXBFJPNKK-UHFFFAOYSA-N propionitrile Chemical compound CCC#N FVSKHRXBFJPNKK-UHFFFAOYSA-N 0.000 description 1
- 239000007870 radical polymerization initiator Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000011115 styrene butadiene Substances 0.000 description 1
- 229920000468 styrene butadiene styrene block copolymer Polymers 0.000 description 1
- YOEYNURYLFDCEV-UHFFFAOYSA-N tert-butyl hydroxy carbonate Chemical compound CC(C)(C)OC(=O)OO YOEYNURYLFDCEV-UHFFFAOYSA-N 0.000 description 1
- CIHOLLKRGTVIJN-UHFFFAOYSA-N tert‐butyl hydroperoxide Chemical compound CC(C)(C)OO CIHOLLKRGTVIJN-UHFFFAOYSA-N 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F279/00—Macromolecular compounds obtained by polymerising monomers on to polymers of monomers having two or more carbon-to-carbon double bonds as defined in group C08F36/00
- C08F279/02—Macromolecular compounds obtained by polymerising monomers on to polymers of monomers having two or more carbon-to-carbon double bonds as defined in group C08F36/00 on to polymers of conjugated dienes
- C08F279/06—Vinyl aromatic monomers and methacrylates as the only monomers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F287/00—Macromolecular compounds obtained by polymerising monomers on to block polymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L51/006—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to block copolymers containing at least one sequence of polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L51/04—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to rubbers
Definitions
- the present invention relates to a rubber-modified styrenic resin composition containing a continuous phase containing a styrenic copolymer and dispersed particles containing a rubber-like polymer.
- High impact polystyrene one of the rubber-modified styrenic resin compositions with excellent impact resistance, is obtained by graft copolymerizing styrene monomers in the presence of polybutadiene. It is opaque due to the refractive index difference of the dispersed particles it contains.
- a styrene-butadiene rubber obtained by copolymerizing (meth)acrylic acid ester-based monomer units is used in the continuous phase and styrene is used in the dispersed particles to obtain a transparent material.
- a rubber-modified styrenic resin composition is obtained, and it is used in a wide range of fields because it has various properties such as transparency, impact resistance, and rigidity. Due to its excellent moldability, molded articles are often produced by injection molding, but there was a problem with surface impact strength, which is related to practical strength.
- An object of the present invention is to provide a rubber-modified styrenic resin composition that is excellent in transparency, surface impact strength and Charpy impact strength.
- a rubber-modified styrenic resin composition containing a continuous phase containing a styrenic copolymer and dispersed particles containing a rubber-like polymer, wherein the styrenic copolymer is styrene and one or more (meth)acrylic ester-based monomer units, and the rubber-modified styrenic resin composition has a graft ratio of 2.12 to 2.40;
- a rubber-modified styrenic resin composition is provided in which the rubber-like polymer has a hydrogenation rate of less than 7 mol %.
- the styrene copolymer has 35 to 75% by mass of the styrene monomer unit and 25 to 65% by mass of the (meth)acrylic acid ester monomer unit, (1)
- the rubber-modified styrenic resin composition according to any one of (5).
- the rubber-modified styrenic resin composition of the present invention is excellent in transparency, surface impact strength and Charpy impact strength, so that molded articles with high appearance and practical strength can be obtained. In addition, because of its excellent fluidity, it is particularly suitable for injection molding applications.
- the resin composition of the present invention is a rubber-modified styrenic resin composition containing a continuous phase containing a styrenic copolymer and dispersed particles containing a rubber-like polymer, wherein the styrenic copolymer is It is a transparent rubber-modified styrenic resin composition having styrenic monomer units and one or more (meth)acrylic acid ester-based monomer units.
- a styrene-based monomer unit is a unit derived from a styrene-based monomer used for polymerization.
- Styrenic monomers include styrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, 2,4-dimethylstyrene, ethylstyrene, p-tert-butylstyrene, ⁇ -methylstyrene, ⁇ -methyl -p-methylstyrene and the like.
- styrene is preferred.
- the styrene-based monomer units may be used alone or in combination of two or more.
- the (meth)acrylic acid ester-based monomer unit is a unit derived from the (meth)acrylic acid ester-based monomer used for polymerization.
- (Meth) acrylic ester-based monomers include methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate (meth) acrylate, methyl acrylate, ethyl Acrylate, n-butyl acrylate, 2-methylhexyl acrylate, 2-ethylhexyl acrylate and decyl acrylate may be used alone or in mixtures of two or more.
- methyl (meth)acrylate As the main component, it is preferable that methyl (meth)acrylate and n-butyl acrylate are included as (meth)acrylic acid ester-based monomer units.
- the styrenic copolymer constituting the continuous phase is a copolymer having styrenic monomer units and one or more (meth)acrylic acid ester monomer units.
- the styrene-based copolymer is mainly composed of styrene-based monomer units and contains one or more (meth)acrylic acid ester-based monomer units, but two or more (meth)acrylic acid ester-based monomer units It is preferable to contain a unit, and the fluidity of the rubber-modified resin composition can be improved by using a component having excellent heat resistance and a component having excellent fluidity in combination. For example, there is a styrene-methyl (meth)acrylate-butyl acrylate copolymer.
- the rubber-like polymer exhibits rubber-like properties at room temperature, and examples thereof include those having a butadiene component such as polybutadiene and styrene-butadiene rubber-based copolymers.
- a butadiene component such as polybutadiene and styrene-butadiene rubber-based copolymers.
- styrene-butadiene rubber or styrene- It is a styrene-butadiene rubber copolymer having styrene monomer units and butadiene monomer units such as butadiene block rubber (block copolymer).
- the content of styrene monomer units in the styrene-butadiene rubber copolymer is preferably 10 to 50% by mass, more preferably 30 to 45% by mass.
- the content of styrene monomer units in the styrene-butadiene rubber-based copolymer is specifically, for example, 10, 15, 20, 25, 30, 35, 40, 45, 50% by mass. It may be in a range between any two of the numbers given.
- some of the unsaturated units such as butadiene monomer units contained in the rubber-like polymer may be hydrogenated, but the proportion of hydrogenated units among the unsaturated units contained (hydrogen addition rate) is less than 7 mol %, preferably 5 mol % or less, more preferably 1 mol % or less.
- a rubber-modified styrene-based resin composition is obtained by graft copolymerizing a styrene-based monomer and a (meth)acrylic acid ester-based monomer in the presence of a rubber-like polymer.
- a graft copolymerization method a method used in the production of high impact polystyrene (HIPS) can be used.
- HIPS high impact polystyrene
- the production of HIPS is often carried out by a continuous polymerization method. It is continuously supplied to the reactor to carry out graft copolymerization. After undergoing phase inversion in which dispersed particles are formed as the polymerization progresses, the polymerization reaction is further advanced.
- the polymerized solution coming out of the reactor is supplied to the devolatilization step to remove the unreacted monomers and the polymerization solvent and at the same time promote cross-linking of the rubber-like polymer constituting the dispersed particles.
- the type of reactor include a complete mixing tank reactor, a tower reactor having a plug flow property, and a loop reactor from which a part of the polymerization solution is withdrawn while the polymerization is progressing. There is no particular restriction on the order of arrangement of these reactors.
- the devolatilization process consists of a vacuum devolatilization tank with a heater and a devolatilization extruder with a vent. The molten resin that has exited the devolatilization step is transferred to the granulation step.
- the molten resin is extruded in strands from a multi-hole die and processed into pellets by a cold cut method, an air hot cut method, or an underwater hot cut method.
- One or more polymerization reactors are arranged in series, but in the case of one, it may be singular, and in the case of two or more, at least two are arranged in series (in series).
- a polymerization solvent, polymerization initiator, and chain transfer agent can be used to control the polymerization reaction.
- the polymerization solvent is used to adjust the polymerization rate, adjust the molecular weight, and reduce the viscosity of the polymerization solution. Examples include alkylbenzenes such as benzene, toluene, ethylbenzene and xylene; and aliphatic hydrocarbons such as cyclohexane can be used.
- the amount of the polymerization solvent used is not particularly limited, but it is usually preferably 1 to 50% by mass, more preferably 3 to 25% by mass, as the composition in the polymerization reactor. preferable. If it exceeds 50% by mass, the productivity may be remarkably lowered, or the molecular weight of the rubber-modified styrenic resin composition may be excessively lowered.
- the polymerization initiator is preferably a radical polymerization initiator, such as known and commonly used 1,1-di(t-butylperoxy)cyclohexane, 2,2-di(t-butylperoxy)butane, 2,2-di (4,4-di-t-butylperoxycyclohexyl)propane, 1,1-di(t-amylperoxy)cyclohexane and other peroxyketals, cumene hydroperoxide, t-butyl hydroperoxide and other hydro Peroxides, t-butyl peroxyacetate, alkyl peroxides such as t-amyl peroxy isononanoate, t-butyl cumyl peroxide, di-t-butyl peroxide, dicumyl peroxide, di-t- Dialkyl peroxides such as hexyl peroxide, peroxyesters such as t-butyl peroxyacetate, t-
- the rubber-modified styrenic resin composition has a graft ratio of 2.12 to 2.40, preferably 2.15 to 2.35. If the graft ratio is less than 2.12, the surface impact strength and transparency may be poor, and if it exceeds 2.40, the Charpy impact strength may be lowered.
- the graft rate is, for example, 2.12, 2.13, 2.14, 2.15, 2.16, 2.17, 2.18, 2.19, 2.20, 2.25, 2.30, 2.35, 2.40, and may be in the range between any two of the numbers exemplified here.
- Components other than rubber include a component such as styrene bound to rubber, a grafted styrene copolymer, an encapsulated styrene copolymer, and the like.
- the grafting ratio can be adjusted by the composition of the rubber-like polymer used, the content of 1,2-vinyl bonds, the type and amount of polymerization initiator added at the beginning, the type of reactor for forming rubber particles, and the like. However, it can also be adjusted by the type and amount of the polymerization initiator added to the polymerization solution after phase inversion.
- the gel content represents the content of dispersed particles.
- 1 g of the rubber-modified styrenic resin composition was precisely weighed (mass W), dissolved by adding 35 ml of a 50% methyl ethyl ketone/50% acetone mixed solution, and the solution was centrifuged. In a separator (Kokusan H-2000B (rotor: H)), centrifuge at 14000 rpm for 30 minutes to precipitate insoluble matter, remove the supernatant by decantation to obtain insoluble matter, and place in a safety oven. Pre-dry at 90 ° C. for 2 hours, further vacuum dry at 120 ° C.
- the rubber content is calculated as a butadiene component (butadiene monomer units).
- a butadiene component butadiene monomer units.
- the content of the butadiene component can be determined from the amount of iodine monochloride obtained.
- the swelling ratio SR of the rubber-modified styrenic resin composition is preferably 8-12.
- the swelling ratio represents the degree of cross-linking of the dispersed particles. If it is less than 8, the impact resistance may deteriorate, and if it exceeds 12, the appearance may deteriorate.
- the swelling ratio SR was obtained by precisely weighing 1 g of rubber-modified styrene resin, adding 30 ml of toluene to dissolve the resin, and centrifuging the solution (H-2000B manufactured by Kokusan Co., Ltd. (rotor: H)) at 14000 rpm for 30 minutes.
- the particle size of the dispersed particles containing the rubber-like polymer is preferably 0.2-2.0 ⁇ m, more preferably 0.4-1.5 ⁇ m. If the particle size is less than 0.2 ⁇ m, the impact resistance may deteriorate, and if it exceeds 2.0 ⁇ m, appearance such as transparency may deteriorate.
- the particle size was determined by cutting an ultra-thin section from the pellet of the rubber-modified styrene resin composition, observing it with a transmission electron microscope (TEM), and analyzing the image of the particles dispersed in the continuous phase. It is a value calculated by the following formula by measuring the equivalent circle diameter Di of .
- Particle size ⁇ ni ⁇ Di 4 / ⁇ ni ⁇ Di 3
- the particle size depends on the composition of the rubber-like polymer used, the content of 1,2-vinyl bonds, the number of reactor agitations during phase inversion when dispersed particles are formed, the polymerization initiator and chain added before phase inversion. It can be adjusted by the type and amount of the transfer agent.
- the monomer unit of the styrenic copolymer constituting the continuous phase is preferably 35 to 75% by mass of styrenic monomer units and 25 to 65% by mass of (meth)acrylic acid ester monomers, More preferably, it contains 45 to 70% by mass of styrene-based monomer units and 30 to 55% by mass of (meth)acrylic acid ester-based monomers. If the structural unit is within the above range, the resulting rubber-modified styrenic resin composition will have an excellent balance of physical properties such as transparency, impact resistance, and fluidity.
- the structural unit constituting the continuous phase is the value measured by 13C-NMR using the reprecipitate of the supernatant from which the gel content was removed.
- the monomer units of the styrenic resin that constitutes the continuous phase can be adjusted according to the composition of the raw materials used for polymerization.
- the weight average molecular weight of the styrenic copolymer constituting the continuous phase is preferably 80,000 to 220,000, more preferably 120,000, from the viewpoint of the strength and moldability of the rubber-modified styrenic resin composition. 000 to 180,000.
- the weight average molecular weight is a polystyrene-equivalent value measured in a THF solvent using gel permeation chromatography (GPC). was used and measured under the following conditions.
- the haze of a rubber-modified styrenic resin composition having a thickness of 2 mm is preferably 5% or less, more preferably 2% or less.
- the degree of haze was measured using an injection molding machine (IS-50EP manufactured by Toshiba Machine Co., Ltd.) under the conditions of a cylinder temperature of 230°C and a mold temperature of 60°C. It was measured using a haze meter (NDH-1001DP model manufactured by Nippon Denshoku Industries Co., Ltd.) according to D1003.
- the refractive index of the rubber-modified styrenic resin composition is preferably 1.53-1.57, more preferably 1.54-1.56. If the refractive index is within the above range, the obtained rubber-modified styrenic resin composition will have an excellent balance of physical properties such as transparency, impact resistance, and fluidity.
- the refractive index can be measured using an Abbe refractometer by producing a molded article having a thickness of 2 mm.
- the rubber-modified styrenic resin composition contains dyes such as bluing agents, plasticizers, hindered phenol antioxidants, phosphorus antioxidants, ultraviolet absorbers, hindered amine stabilizers, Antistatic agents, internal lubricants such as stearic acid, external lubricants such as ethylenebisstearylamide, MS resins, MBS resins, emulsion graft copolymers, and the like may be added.
- dyes such as bluing agents, plasticizers, hindered phenol antioxidants, phosphorus antioxidants, ultraviolet absorbers, hindered amine stabilizers, Antistatic agents, internal lubricants such as stearic acid, external lubricants such as ethylenebisstearylamide, MS resins, MBS resins, emulsion graft copolymers, and the like may be added.
- the rubber-modified styrenic resin composition can be formed into a molded body by a known molding method, but it is preferably used for injection molding because of its excellent fluidity.
- Examples 1 to 5, Comparative Examples 1 to 3 A polymerization process was constituted by connecting in series the first and second reactors, which are complete mixing tanks, and the third reactor, which is a tower-type plug flow reactor with stirring blades. The capacity of each reactor was 5 L for the first reactor, 15 L for the second reactor, and 40 L for the third reactor. A raw material solution was prepared with the raw material composition shown in Table 1, and the raw material solution was continuously supplied to the first reactor at the flow rate shown in Table 1.
- the rubber-like polymer is Asahi Kasei Asaprene 670A (styrene-butadiene block rubber, styrene content: 40% by mass, viscosity of 5% by mass styrene solution at 25°C: 32 mPa ⁇ s, ratio of 1,2-vinyl bonds: 13. 5 mol %, hydrogenation rate 0 mol %) was used.
- the polymerization initiator and the chain transfer agent are added to the raw material solution at the inlets of the first reactor and the third reactor so that the concentration shown in Table 1 (mass-based concentration with respect to the raw material supply flow rate) is added and uniformly mixed. added.
- polymerization initiator-1 is 1,1-bis(t-butylperoxy)-cyclohexane (Perhexa C manufactured by NOF Corporation was used.), and polymerization initiator-2 is t-butylcumin. Ruperoxide (perbutyl C manufactured by NOF Corporation was used), and the chain transfer agent was n-dodecyl mercaptan.
- the reaction temperature was adjusted to the temperature shown in Table 1, and in the third reactor, the temperature was adjusted so that the inlet temperature was 130°C and the outlet temperature was 165°C.
- the polymerization solution continuously taken out from the third reactor is introduced into a vacuum devolatilization tank equipped with a preheater, the temperature of the preheater is adjusted so that the resin temperature becomes 230° C., and the pressure in the devolatilization tank is increased.
- Unreacted styrene and ethylbenzene (EB) are separated by adjusting the pressure to 1 kPa, extruded into strands from a perforated die, and the strands are cooled and cut by a cold cut method to pelletize the rubber-modified styrenic resin.
- a composition was obtained.
- Table 2 shows the measurements and evaluations of the obtained rubber-modified styrenic resin composition and the styrenic copolymer contained therein.
- the content (% by mass) of the butadiene component was determined as the rubber content. Dissolve the rubber-modified styrenic resin composition in chloroform, add a certain amount of iodine monochloride/carbon tetrachloride solution, leave for about 1 hour in a dark place, add potassium iodide solution, and reduce excess iodine monochloride to zero. It was determined from the amount of iodine monochloride added by titration with 1N sodium thiosulfate/ethanol aqueous solution.
- the refractive index was measured using an Abbe refractometer in accordance with JIS K 7142 by producing a molded product with a thickness of 2 mm.
- the weight average molecular weight of the styrenic copolymer constituting the continuous phase is obtained by measuring the gel content as a polystyrene-equivalent value measured in THF solvent using gel permeation chromatography (GPC). Measurement was performed under the following conditions using the reprecipitate of the supernatant from which the minutes had been removed.
- the reprecipitate is obtained by putting the supernatant liquid separated by decantation into a 300 ml beaker in the measurement of the gel content, rapidly adding 250 ml of methanol to reprecipitate the polymer content, and filtering the precipitated polymer content with suction through a filter.
- the polymer on the filter was placed in a vacuum dryer and vacuum-dried for 1.5 hours or longer before use.
- styrene content/MMA content The content of styrene monomer units (styrene content) and the content of methyl methacrylate monomer units (MMA content), which are the constituent units of the styrene copolymer that constitutes the continuous phase, are the gel fraction. Measurement was carried out by 13C-NMR using the reprecipitate of the supernatant obtained in the measurement from which the gel content was removed. The reprecipitate is the same as the reprecipitate in (weight average molecular weight).
- the structural unit of the styrene copolymer contains n-butyl acrylate (n-BA) as a (meth)acrylic acid ester-based monomer unit, and the content of the n-butyl acrylate is 100% by mass. minus the styrene content and the MMA content.
- Melt mass flow rate Melt mass flow rate was measured at 200° C. and 49 N load based on JIS K7210.
- the Charpy impact strength was measured according to JIS K7111-1, using notched test pieces and adopting an edgewise impact direction. A digital impact tester manufactured by Toyo Seiki Seisakusho Co., Ltd. was used as the measuring machine.
- the bending elastic modulus was measured at a bending speed of 2 mm/min according to JIS K7171.
- the rubber-modified styrenic resin compositions of Examples are excellent in transparency, surface impact strength and Charpy impact strength.
- the rubber-modified styrenic resin composition of the present invention yields a molded article that is transparent and has excellent impact resistance. Moreover, since it has excellent fluidity, it is particularly suitable for injection molding, and since it has excellent surface impact strength, it can be used for housings of home electric appliances and the like.
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Abstract
Description
(1)スチレン系共重合体を含む連続相と、ゴム状重合体を含む分散粒子と、を含有するゴム変性スチレン系樹脂組成物であって、前記スチレン系共重合体が、スチレン系単量体単位と、一種以上の(メタ)アクリル酸エステル系単量体単位と、を有し、前記ゴム変性スチレン系樹脂組成物のグラフト率が2.12~2.40であり、前記ゴム状重合体の水素添加率が7モル%未満である、ゴム変性スチレン系樹脂組成物。
(2)2mm厚み成形体の曇り度が5%以下である、(1)に記載のゴム変性スチレン系樹脂組成物。
(3)前記ゴム状重合体がスチレン-ブタジエンゴム系共重合体である、(1)または(2)に記載のゴム変性スチレン系樹脂組成物。
(4)前記スチレン-ブタジエンゴム系共重合体のスチレン単量体単位の含有量は10~50質量%である、(3)に記載のゴム変性スチレン系樹脂組成物。
(5)屈折率が1.53~1.57である、(1)~(4)いずれかに記載のゴム変性スチレン系樹脂組成物。
(6)前記スチレン系共重合体が、前記スチレン系単量体単位35~75質量%と、前記(メタ)アクリル酸エステル系単量体単位25~65質量%と、を有する、(1)~(5)のいずれかに記載のゴム変性スチレン系樹脂組成物。
本願明細書において、例えば、「A~B」なる記載は、A以上でありB以下であることを意味する。
ゲル分(質量%)=(G/W)×100
なお、デカンテーションにより分離した上澄み液を300mlビーカーに入れ、メタノール250mlを急激に加え、ポリマー分を再沈させ、沈殿したポリマー分をフィルターで吸引ろ過し、フィルター上のポリマーを真空乾燥機にいれて1.5時間以上真空乾燥し、後述の連続相を構成するスチレン系樹脂の単量体単位と重量平均分子量の測定に使用した。
膨潤比SR=S/D
粒子径=Σni・ Di4/Σni・Di3
粒子径は、使用するゴム状重合体の組成や1,2-ビニル結合の含有量、分散粒子が形成される転相時の反応器攪拌数、転相前に添加される重合開始剤および連鎖移動剤の種類や添加量で調整することができる。
装置名:SYSTEM-21 Shodex(昭和電工社製)
カラム:PL gel MIXED-Bを3本直列
温度:40℃
検出:示差屈折率
溶媒:テトラヒドロフラン
濃度:2質量%
検量線:標準ポリスチレン(PS)(PL社製)を用いて作製した。
完全混合型撹拌槽である第1反応器および第2反応器と攪拌翼付塔型プラグフロー型反応器である第3反応器を直列に接続して重合工程を構成した。各反応器の容量は、第1反応器を5L、第2反応器を15L、第3反応器を40Lとした。表1に記載の原料組成にて、原料溶液を作成し、第1反応器に原料溶液を表1に記載の流量にて連続的に供給した。ゴム状重合体は、旭化成社製アサプレン670A(スチレン-ブタジエンブロックゴム、スチレン含有量が40質量%、温度25℃における5質量%スチレン溶液粘度32mPa・s、1,2-ビニル結合の割合13.5モル%、水素添加率0モル%)を使用した。重合開始剤及び連鎖移動剤は、第1反応器および第3反応器の入口で表1に記載の添加濃度(原料供給流量に対する質量基準の濃度)となるように原料溶液に添加し、均一混合した添加した。表1中、重合開始剤-1は1,1-ビス(t-ブチルパーオキシ)-シクロヘキサン(日油株式会社製パーヘキサCを使用した。)であり、重合開始剤-2はt-ブチルクミルパーオキサイド(日油株式会社製パーブチルCを使用した。)であり、連鎖移動剤はn-ドデシルメルカプタンである。反応温度は表1記載の温度に槽内温度を調整し、第3反応器では、入口温度130℃から出口温度が165℃となるよう勾配をつけて調整した。続いて、第3反応器より連続的に取り出した重合溶液を予熱器付き真空脱揮槽に導入し、樹脂温度が230℃となるよう予熱器の温度を調整し、脱揮槽内の圧力を1kPaに調整することで、未反応スチレン及びエチルベンゼン(EB)を分離した後、多孔ダイよりストランド状に押し出しして、コールドカット方式にて、ストランドを冷却および切断しペレット化したゴム変性スチレン系樹脂組成物を得た。得たゴム変性スチレン系樹脂組成物及びこれに含まれるスチレン系共重合体についての測定及び評価について表2に示す。
ブタジエン成分の含有量(質量%)をゴム分として求めた。ゴム変性スチレン系樹脂組成物をクロロホルムに溶解させ、一定量の一塩化ヨウ素/四塩化炭素溶液を加え、暗所に約1時間放置後、ヨウ化カリウム溶液を加え、過剰の一塩化ヨウ素を0.1Nチオ硫酸ナトリウム/エタノール水溶液で滴定し、付加した一塩化ヨウ素量から求めた。
1gのゴム変性スチレン系樹脂組成物を精秤し(質量W)、50%メチルエチルケトン/50%アセトン混合溶液35mlを加えて溶解した。その溶液を遠心分離機(コクサン社製H-2000B(ローター:H))にて、14000rpmで30分間遠心分離して不溶分を沈降させ、デカンテーションにより上澄み液を除去して不溶分を得た。その不溶分を、セーフティーオーブンにて90℃で2時間予備乾燥し、更に真空乾燥機にて120℃で1時間真空乾燥し、20分間デシケーター中で冷却した後、乾燥した不溶分の質量Gを測定した。G及びWを用いて、次の式に基づきゲル分を算出した。
ゲル分(質量%)=(G/W)×100
グラフト率は次の式に基づき算出した。
グラフト率=(ゲル分-ゴム分)/ゴム分
膨潤比SRは、1gのゴム変性スチレン系樹脂を精秤し、トルエン30mlを加え溶解し、その溶液を遠心分離機(コクサン社製H-2000B(ローター:H))にて、14000rpmで30分間遠心分離して不溶分を沈降させ、デカンテーションにより上澄み液を除去してトルエンで膨潤した不溶分の質量Sを測定し、続いてトルエンで膨潤した不溶分をセーフティーオーブンにて90℃で2時間予備乾燥した後、更に真空乾燥機にて120℃で1時間真空乾燥し、20分間デシケーター中で冷却した後、不溶分の乾燥質量Dを測定して、次の式に基づき算出した。
膨潤比SR=S/D
粒子径は、ゴム変性スチレン系樹脂組成物のペレットから超薄切片を切り出し、透過型電子顕微鏡(TEM)の観察を行い、連続相に分散した粒子の画像解析により、約2,000個の粒子の円相当径Diを計測して下記の式により算出した。
粒子径=Σni・ Di4/Σni・Di3
屈折率は2mm厚みの成形品を作製し、JIS K 7142に準じてアッベ屈折率計を用いて測定した。
連続相を構成するスチレン系共重合体の重量平均分子量は、ゲルパーミエーションクロマトグラフィー(GPC)を用い、THF溶媒中で測定されるポリスチレン換算の値として、ゲル分の測定で得られた、ゲル分を除いた上澄み液の再沈物を用い、次の条件で測定した。
装置名:SYSTEM-21 Shodex(昭和電工社製)
カラム:PL gel MIXED-Bを3本直列
温度:40℃
検出:示差屈折率
溶媒:テトラヒドロフラン
濃度:2質量%
検量線:標準ポリスチレン(PS)(PL社製)を用いて作製した。
連続相を構成するスチレン系共重合体の構成単位である、スチレン単量体単位の含有量(スチレン含有量)及びメタクリル酸メチル単量体単位の含有量(MMA含有量)は、ゲル分の測定で得られた、ゲル分を除いた上澄み液の再沈物を用い、13C-NMRによって測定した。再沈物については、(重量平均分子量)における再沈物と同様である。なお、スチレン系共重合体の構成単位には、n-ブチルアクリレート(n-BA)が(メタ)アクリル酸エステル系単量体単位として含まれ、当該n-ブチルアクリレートの含有量は100質量%からスチレン含有量及びMMA含有量を差し引いた量である。
メルトマスフローレイトは、JIS K7210に基づき、200℃、49N荷重にて測定した。
射出成型機(東芝機械社製IS-50EP)を用いて、シリンダー温度230℃、金型温度60℃の成形条件で成形された縦90mm、横55mm、厚み2mmの鏡面プレートをASTM D1003に準拠しヘーズメータ(日本電色工業社製NDH-1001DP型)を用いてHazeを測定した。
シャルピー衝撃強さは、JIS K7111-1に基づき、ノッチあり試験片を用い、打撃方向はエッジワイズを採用して測定した。なお、測定機は東洋精機製作所社製デジタル衝撃試験機を使用した。
射出成型機(東芝機械社製IS-55EPN)を用いて、シリンダー温度230℃、金型温度60℃、射出速度70%の成形条件で成形された縦90mm、横90mm、厚み2mmの試験片(フィルムゲート)を用い、島津製作所製の高速パンクチャー衝撃試験機(HITS-PX)で面衝撃試験を実施した。23℃、ストライカー径12.7mm(ASTM D3763)、ピストン速度5m/secの条件で、クランプに固定した試験片の中央部分に衝撃を加えて破壊し、最大衝撃点に達するまでに吸収したエネルギーを面衝撃強度とした。
曲げ弾性率は、JIS K7171に基づき、曲げ速度2mm/minで測定した。
Claims (6)
- スチレン系共重合体を含む連続相と、ゴム状重合体を含む分散粒子と、を含有するゴム変性スチレン系樹脂組成物であって、
前記スチレン系共重合体が、スチレン系単量体単位と、一種以上の(メタ)アクリル酸エステル系単量体単位と、を有し、
前記ゴム変性スチレン系樹脂組成物のグラフト率が2.12~2.40であり、
前記ゴム状重合体の水素添加率が7モル%未満である、
ゴム変性スチレン系樹脂組成物。 - 2mm厚み成形体の曇り度が5%以下である、請求項1に記載のゴム変性スチレン系樹脂組成物。
- 前記ゴム状重合体がスチレン-ブタジエンゴム系共重合体である、請求項1に記載のゴム変性スチレン系樹脂組成物。
- 前記スチレン-ブタジエンゴム系共重合体のスチレン単量体単位の含有量は10~50質量%である、請求項3に記載のゴム変性スチレン系樹脂組成物。
- 屈折率が1.53~1.57である、請求項1に記載のゴム変性スチレン系樹脂組成物。
- 前記スチレン系共重合体が、前記スチレン系単量体単位35~75質量%と、前記(メタ)アクリル酸エステル系単量体単位25~65質量%と、を有する、請求項1~請求項5のいずれかに記載のゴム変性スチレン系樹脂組成物。
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