WO2017146169A1 - メタクリル樹脂組成物および射出成形品 - Google Patents
メタクリル樹脂組成物および射出成形品 Download PDFInfo
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- WO2017146169A1 WO2017146169A1 PCT/JP2017/006920 JP2017006920W WO2017146169A1 WO 2017146169 A1 WO2017146169 A1 WO 2017146169A1 JP 2017006920 W JP2017006920 W JP 2017006920W WO 2017146169 A1 WO2017146169 A1 WO 2017146169A1
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- Prior art keywords
- methacrylic resin
- resin composition
- minutes
- molecular weight
- mass
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- 239000000113 methacrylic resin Substances 0.000 title claims abstract description 100
- 239000000203 mixture Substances 0.000 title claims abstract description 57
- 239000000178 monomer Substances 0.000 claims abstract description 41
- 238000000465 moulding Methods 0.000 claims abstract description 31
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 29
- 239000000155 melt Substances 0.000 claims abstract description 23
- 230000003287 optical effect Effects 0.000 claims abstract description 19
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical group COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000007924 injection Substances 0.000 claims description 25
- 238000002347 injection Methods 0.000 claims description 25
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 20
- 238000001746 injection moulding Methods 0.000 claims description 17
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 238000012662 bulk polymerization Methods 0.000 claims description 9
- 125000005396 acrylic acid ester group Chemical group 0.000 abstract description 5
- 239000011347 resin Substances 0.000 description 29
- 229920005989 resin Polymers 0.000 description 29
- 229920000642 polymer Polymers 0.000 description 20
- 238000000034 method Methods 0.000 description 18
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 description 15
- -1 acrylic acid aryl esters Chemical class 0.000 description 15
- 239000003963 antioxidant agent Substances 0.000 description 15
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- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 9
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 8
- 238000002156 mixing Methods 0.000 description 8
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- 230000003078 antioxidant effect Effects 0.000 description 7
- KZCOBXFFBQJQHH-UHFFFAOYSA-N octane-1-thiol Chemical compound CCCCCCCCS KZCOBXFFBQJQHH-UHFFFAOYSA-N 0.000 description 7
- 239000002245 particle Substances 0.000 description 7
- 239000003505 polymerization initiator Substances 0.000 description 7
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- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 6
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- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 4
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- GLDOVTGHNKAZLK-UHFFFAOYSA-N octadecan-1-ol Chemical compound CCCCCCCCCCCCCCCCCCO GLDOVTGHNKAZLK-UHFFFAOYSA-N 0.000 description 4
- 239000011342 resin composition Substances 0.000 description 4
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- OLFNXLXEGXRUOI-UHFFFAOYSA-N 2-(benzotriazol-2-yl)-4,6-bis(2-phenylpropan-2-yl)phenol Chemical compound C=1C(N2N=C3C=CC=CC3=N2)=C(O)C(C(C)(C)C=2C=CC=CC=2)=CC=1C(C)(C)C1=CC=CC=C1 OLFNXLXEGXRUOI-UHFFFAOYSA-N 0.000 description 2
- IYAZLDLPUNDVAG-UHFFFAOYSA-N 2-(benzotriazol-2-yl)-4-(2,4,4-trimethylpentan-2-yl)phenol Chemical compound CC(C)(C)CC(C)(C)C1=CC=C(O)C(N2N=C3C=CC=CC3=N2)=C1 IYAZLDLPUNDVAG-UHFFFAOYSA-N 0.000 description 2
- SSADPHQCUURWSW-UHFFFAOYSA-N 3,9-bis(2,6-ditert-butyl-4-methylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane Chemical compound CC(C)(C)C1=CC(C)=CC(C(C)(C)C)=C1OP1OCC2(COP(OC=3C(=CC(C)=CC=3C(C)(C)C)C(C)(C)C)OC2)CO1 SSADPHQCUURWSW-UHFFFAOYSA-N 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 2
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- MOYAFQVGZZPNRA-UHFFFAOYSA-N Terpinolene Chemical compound CC(C)=C1CCC(C)=CC1 MOYAFQVGZZPNRA-UHFFFAOYSA-N 0.000 description 2
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- VBICKXHEKHSIBG-UHFFFAOYSA-N beta-monoglyceryl stearate Natural products CCCCCCCCCCCCCCCCCC(=O)OCC(O)CO VBICKXHEKHSIBG-UHFFFAOYSA-N 0.000 description 2
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- UKMSUNONTOPOIO-UHFFFAOYSA-N docosanoic acid Chemical compound CCCCCCCCCCCCCCCCCCCCCC(O)=O UKMSUNONTOPOIO-UHFFFAOYSA-N 0.000 description 2
- 239000003480 eluent Substances 0.000 description 2
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- BXWNKGSJHAJOGX-UHFFFAOYSA-N hexadecan-1-ol Chemical compound CCCCCCCCCCCCCCCCO BXWNKGSJHAJOGX-UHFFFAOYSA-N 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 239000006224 matting agent Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- YIMHRDBSVCPJOV-UHFFFAOYSA-N n'-(2-ethoxyphenyl)-n-(2-ethylphenyl)oxamide Chemical compound CCOC1=CC=CC=C1NC(=O)C(=O)NC1=CC=CC=C1CC YIMHRDBSVCPJOV-UHFFFAOYSA-N 0.000 description 2
- GOQYKNQRPGWPLP-UHFFFAOYSA-N n-heptadecyl alcohol Natural products CCCCCCCCCCCCCCCCCO GOQYKNQRPGWPLP-UHFFFAOYSA-N 0.000 description 2
- LYRFLYHAGKPMFH-UHFFFAOYSA-N octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(N)=O LYRFLYHAGKPMFH-UHFFFAOYSA-N 0.000 description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 2
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 2
- SSDSCDGVMJFTEQ-UHFFFAOYSA-N octadecyl 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 SSDSCDGVMJFTEQ-UHFFFAOYSA-N 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
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- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 2
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- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 2
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- FEODVXCWZVOEIR-UHFFFAOYSA-N (2,4-ditert-butylphenyl) octyl hydrogen phosphite Chemical compound CCCCCCCCOP(O)OC1=CC=C(C(C)(C)C)C=C1C(C)(C)C FEODVXCWZVOEIR-UHFFFAOYSA-N 0.000 description 1
- JYEUMXHLPRZUAT-UHFFFAOYSA-N 1,2,3-triazine Chemical compound C1=CN=NN=C1 JYEUMXHLPRZUAT-UHFFFAOYSA-N 0.000 description 1
- LDVVTQMJQSCDMK-UHFFFAOYSA-N 1,3-dihydroxypropan-2-yl formate Chemical compound OCC(CO)OC=O LDVVTQMJQSCDMK-UHFFFAOYSA-N 0.000 description 1
- KBPLFHHGFOOTCA-UHFFFAOYSA-N 1-Octanol Chemical compound CCCCCCCCO KBPLFHHGFOOTCA-UHFFFAOYSA-N 0.000 description 1
- ULQISTXYYBZJSJ-UHFFFAOYSA-N 12-hydroxyoctadecanoic acid Chemical compound CCCCCCC(O)CCCCCCCCCCC(O)=O ULQISTXYYBZJSJ-UHFFFAOYSA-N 0.000 description 1
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- IEMBFTKNPXENSE-UHFFFAOYSA-N 2-(2-methylpentan-2-ylperoxy)propan-2-yl hydrogen carbonate Chemical compound CCCC(C)(C)OOC(C)(C)OC(O)=O IEMBFTKNPXENSE-UHFFFAOYSA-N 0.000 description 1
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- KIHBGTRZFAVZRV-UHFFFAOYSA-N 2-Hydroxyoctadecanoic acid Natural products CCCCCCCCCCCCCCCCC(O)C(O)=O KIHBGTRZFAVZRV-UHFFFAOYSA-N 0.000 description 1
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- PYSRRFNXTXNWCD-UHFFFAOYSA-N 3-(2-phenylethenyl)furan-2,5-dione Chemical compound O=C1OC(=O)C(C=CC=2C=CC=CC=2)=C1 PYSRRFNXTXNWCD-UHFFFAOYSA-N 0.000 description 1
- KTFGFGGLCMGYTP-UHFFFAOYSA-N 4-Anilino-4-oxobutanoic acid Chemical class OC(=O)CCC(=O)NC1=CC=CC=C1 KTFGFGGLCMGYTP-UHFFFAOYSA-N 0.000 description 1
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- CNGYZEMWVAWWOB-VAWYXSNFSA-N 5-[[4-anilino-6-[bis(2-hydroxyethyl)amino]-1,3,5-triazin-2-yl]amino]-2-[(e)-2-[4-[[4-anilino-6-[bis(2-hydroxyethyl)amino]-1,3,5-triazin-2-yl]amino]-2-sulfophenyl]ethenyl]benzenesulfonic acid Chemical compound N=1C(NC=2C=C(C(\C=C\C=3C(=CC(NC=4N=C(N=C(NC=5C=CC=CC=5)N=4)N(CCO)CCO)=CC=3)S(O)(=O)=O)=CC=2)S(O)(=O)=O)=NC(N(CCO)CCO)=NC=1NC1=CC=CC=C1 CNGYZEMWVAWWOB-VAWYXSNFSA-N 0.000 description 1
- DFANMEUHPMJFDO-UHFFFAOYSA-N 6-[4,6-bis(4-hexoxy-2-hydroxy-3-methylphenyl)-1,3,5-triazin-2-yl]-3-hexoxy-2-methylphenol Chemical compound OC1=C(C)C(OCCCCCC)=CC=C1C1=NC(C=2C(=C(C)C(OCCCCCC)=CC=2)O)=NC(C=2C(=C(C)C(OCCCCCC)=CC=2)O)=N1 DFANMEUHPMJFDO-UHFFFAOYSA-N 0.000 description 1
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- IORUEKDKNHHQAL-UHFFFAOYSA-N [2-tert-butyl-6-[(3-tert-butyl-2-hydroxy-5-methylphenyl)methyl]-4-methylphenyl] prop-2-enoate Chemical compound CC(C)(C)C1=CC(C)=CC(CC=2C(=C(C=C(C)C=2)C(C)(C)C)OC(=O)C=C)=C1O IORUEKDKNHHQAL-UHFFFAOYSA-N 0.000 description 1
- BQSKNBWWBWTGRI-UHFFFAOYSA-N [2-tert-butyl-6-[(3-tert-butyl-5-methylphenyl)-hydroxymethyl]-4-methylphenyl] prop-2-enoate Chemical compound CC(C)(C)C1=CC(C)=CC(C(O)C=2C(=C(C=C(C)C=2)C(C)(C)C)OC(=O)C=C)=C1 BQSKNBWWBWTGRI-UHFFFAOYSA-N 0.000 description 1
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- KHAYCTOSKLIHEP-UHFFFAOYSA-N docosyl prop-2-enoate Chemical compound CCCCCCCCCCCCCCCCCCCCCCOC(=O)C=C KHAYCTOSKLIHEP-UHFFFAOYSA-N 0.000 description 1
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- 239000003063 flame retardant Substances 0.000 description 1
- 239000005357 flat glass Substances 0.000 description 1
- 239000007850 fluorescent dye Substances 0.000 description 1
- 238000010528 free radical solution polymerization reaction Methods 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- PZDUWXKXFAIFOR-UHFFFAOYSA-N hexadecyl prop-2-enoate Chemical compound CCCCCCCCCCCCCCCCOC(=O)C=C PZDUWXKXFAIFOR-UHFFFAOYSA-N 0.000 description 1
- LNMQRPPRQDGUDR-UHFFFAOYSA-N hexyl prop-2-enoate Chemical compound CCCCCCOC(=O)C=C LNMQRPPRQDGUDR-UHFFFAOYSA-N 0.000 description 1
- 229920005669 high impact polystyrene Polymers 0.000 description 1
- 239000004797 high-impact polystyrene Substances 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- PBOSTUDLECTMNL-UHFFFAOYSA-N lauryl acrylate Chemical compound CCCCCCCCCCCCOC(=O)C=C PBOSTUDLECTMNL-UHFFFAOYSA-N 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 125000005395 methacrylic acid group Chemical group 0.000 description 1
- 230000036651 mood Effects 0.000 description 1
- FTQWRYSLUYAIRQ-UHFFFAOYSA-N n-[(octadecanoylamino)methyl]octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(=O)NCNC(=O)CCCCCCCCCCCCCCCCC FTQWRYSLUYAIRQ-UHFFFAOYSA-N 0.000 description 1
- 229940065472 octyl acrylate Drugs 0.000 description 1
- ANISOHQJBAQUQP-UHFFFAOYSA-N octyl prop-2-enoate Chemical compound CCCCCCCCOC(=O)C=C ANISOHQJBAQUQP-UHFFFAOYSA-N 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- ULDDEWDFUNBUCM-UHFFFAOYSA-N pentyl prop-2-enoate Chemical compound CCCCCOC(=O)C=C ULDDEWDFUNBUCM-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
- WRAQQYDMVSCOTE-UHFFFAOYSA-N phenyl prop-2-enoate Chemical compound C=CC(=O)OC1=CC=CC=C1 WRAQQYDMVSCOTE-UHFFFAOYSA-N 0.000 description 1
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920000636 poly(norbornene) polymer Polymers 0.000 description 1
- 229920001748 polybutylene Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- 229920000069 polyphenylene sulfide Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920002742 polystyrene-block-poly(ethylene/propylene) -block-polystyrene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000005033 polyvinylidene chloride Substances 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 239000000843 powder Substances 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
- LYBIZMNPXTXVMV-UHFFFAOYSA-N propan-2-yl prop-2-enoate Chemical compound CC(C)OC(=O)C=C LYBIZMNPXTXVMV-UHFFFAOYSA-N 0.000 description 1
- PNXMTCDJUBJHQJ-UHFFFAOYSA-N propyl prop-2-enoate Chemical compound CCCOC(=O)C=C PNXMTCDJUBJHQJ-UHFFFAOYSA-N 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 238000000045 pyrolysis gas chromatography Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 150000003873 salicylate salts Chemical class 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 229940037312 stearamide Drugs 0.000 description 1
- 229960004274 stearic acid Drugs 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 229920001935 styrene-ethylene-butadiene-styrene Polymers 0.000 description 1
- 238000010558 suspension polymerization method Methods 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- ISXSCDLOGDJUNJ-UHFFFAOYSA-N tert-butyl prop-2-enoate Chemical compound CC(C)(C)OC(=O)C=C ISXSCDLOGDJUNJ-UHFFFAOYSA-N 0.000 description 1
- XZHNPVKXBNDGJD-UHFFFAOYSA-N tetradecyl prop-2-enoate Chemical compound CCCCCCCCCCCCCCOC(=O)C=C XZHNPVKXBNDGJD-UHFFFAOYSA-N 0.000 description 1
- 229920002725 thermoplastic elastomer Polymers 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- UFTFJSFQGQCHQW-UHFFFAOYSA-N triformin Chemical compound O=COCC(OC=O)COC=O UFTFJSFQGQCHQW-UHFFFAOYSA-N 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/04—Homopolymers or copolymers of esters
- C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
- C08L33/10—Homopolymers or copolymers of methacrylic acid esters
- C08L33/12—Homopolymers or copolymers of methyl methacrylate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0001—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor characterised by the choice of material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
-
- 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
- C08F2/00—Processes of polymerisation
- C08F2/02—Polymerisation in bulk
-
- 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
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/04—Acids; Metal salts or ammonium salts thereof
- C08F220/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
-
- 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
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/14—Methyl esters, e.g. methyl (meth)acrylate
-
- 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
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/04—Homopolymers or copolymers of esters
- C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
- C08L33/08—Homopolymers or copolymers of acrylic acid esters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76003—Measured parameter
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2033/00—Use of polymers of unsaturated acids or derivatives thereof as moulding material
- B29K2033/04—Polymers of esters
- B29K2033/12—Polymers of methacrylic acid esters, e.g. PMMA, i.e. polymethylmethacrylate
-
- 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
- C08F2500/00—Characteristics or properties of obtained polyolefins; Use thereof
- C08F2500/01—High molecular weight, e.g. >800,000 Da.
-
- 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
- C08F2500/00—Characteristics or properties of obtained polyolefins; Use thereof
- C08F2500/03—Narrow molecular weight distribution, i.e. Mw/Mn < 3
Definitions
- the present invention relates to a methacrylic resin composition, an injection molded product, and a method for producing them. More specifically, the present invention relates to a methacrylic resin composition that is excellent in fluidity during heat molding and hardly colored, an injection-molded product having high heat resistance and high mechanical strength, and a method for producing the same.
- Methacrylic resin has high transparency and is useful as a material for molded products used for optical members, illumination members, signboard members, decorative members, and the like. In some fields where methacrylic resin molded products are used, there is a demand for weight reduction or thinning of the molded products. In order to obtain a thin molded product, the methacrylic resin needs to have high fluidity when melted. As measures for increasing the fluidity of the resin, it is generally known to lower the softening temperature or glass transition temperature, lower the molecular weight, widen the molecular weight distribution, and the like. However, when these measures are applied to a methacrylic resin, it causes a decrease in heat resistance and a decrease in mechanical strength. In view of the above, References 1 to 4 propose various methods for producing methacrylic resins.
- An object of the present invention is to provide a methacrylic resin composition that is excellent in fluidity during heat molding and hardly colored, an injection-molded product having high heat resistance and high mechanical strength, and a method for producing the same.
- methacrylic resin containing 90 to 50% by weight of a methacrylic resin comprising 95 to 100% by weight of methyl methacrylate monomer units and 0 to 5% by weight of acrylic acid ester monomer units.
- MFR melt flow rate
- the present invention includes the following forms. [1] comprising 95 to 100% by mass of methyl methacrylate monomer units and 0 to 5% by mass of acrylate monomer units,
- the weight average molecular weight Mw is 57000-90000, 90% by mass or more of a methacrylic resin having a ratio Mw / Mn of the weight average molecular weight Mw to the number average molecular weight Mn of 1.9 or less,
- [2] An injection molded product comprising the methacrylic resin composition according to [1].
- [3] A plate having a thickness of 1 mm or less, comprising the methacrylic resin composition according to [1].
- a method for producing an injection-molded article comprising injection-molding a methacrylic resin composition having an absolute value of a difference from YI2) of 3 or less and satisfying the relationship of formulas (B) and (C).
- R is a melt flow rate (unit: g / 10 minutes) measured at 230 ° C. and 3.8 kg load of the methacrylic resin composition.
- W is the ratio (unit: mass%) of the acrylate monomer unit to the total monomer units of the methacrylic resin.
- P is the degree of polymerization of the methacrylic resin. ]
- the methacrylic resin composition of the present invention is excellent in fluidity and hardly causes molding defects such as silver streak, crack, sink mark, flow mark, resin burn, gas stain, coloring and the like.
- the methacrylic resin composition of the present invention is suitable for injection molding.
- the methacrylic resin composition of the present invention is suitable for obtaining a thin molded article, for example, a plate having a thickness of 1 mm or less.
- a molded article made of the methacrylic resin composition of the present invention has high heat resistance and mechanical strength, and has no appearance defects such as coloring. Since the methacrylic resin composition of the present invention has low heat generation due to shear during injection molding, and can be injection-molded at a low temperature and a high injection pressure, the appearance of the resulting molded product is good.
- the methacrylic resin composition of the present invention comprises a methacrylic resin.
- the amount of the methacrylic resin contained in the methacrylic resin composition of the present invention is 90% by mass or more, preferably 90 to 99.9% by mass, more preferably 90 to 99.5% by mass.
- the methacrylic resin used in the present invention comprises a methyl methacrylate monomer unit and, if necessary, an acrylate monomer unit.
- the content of the methyl methacrylate monomer unit is 95 to 100% by mass, preferably 95 to 98% by mass, more preferably 95 to 96% by mass.
- the content of the acrylate monomer unit is 0 to 5% by mass, preferably 2 to 5% by mass, more preferably 4 to 5% by mass.
- the yellow index (YI4) of the optical path length of 200 mm of the injection molded product obtained at a cylinder temperature of 280 ° C. and a molding cycle of 4 minutes is small. Difficult to color due to heat.
- acrylic acid ester monomers include methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, t-butyl acrylate, pentyl acrylate, hexyl acrylate, octyl acrylate, 2-ethylhexyl acrylate, Acrylic acid alkyl esters such as cyclohexyl acrylate, dodecyl acrylate, myristyl acrylate, palmityl acrylate, stearyl acrylate, and behenyl acrylate; acrylic acid aryl esters such as phenyl acrylate; acrylic acid aralkyl esters such as benzyl acrylate; Of these, acrylic acid alkyl esters are preferred.
- the alkyl acrylate ester preferably has 1 to 8 carbon atoms in the alkyl group, more preferably 1 or
- the methacrylic resin used in the present invention has a weight average molecular weight Mw of 57000 to 90000, preferably 70000 to 85000, and more preferably 70000 to 79000.
- Mw weight average molecular weight
- the melt flow rate R of the methacrylic resin composition tends to be lowered, and injection molding of a thin molded product tends to be difficult.
- the weight average molecular weight is less than the above range, the obtained molded product has a low mechanical strength or becomes brittle. For example, when the obtained molded product is taken out from the mold, Fragile.
- the ratio Mw / Mn of the weight average molecular weight Mw to the number average molecular weight Mn is 1.9 or less, preferably 1.7 or more and 1.8 or less. Even if the weight average molecular weight is within the above range, if Mw / Mn exceeds 1.9 due to a large proportion of the low molecular weight polymer component, the resulting molded product is brittle and has a low surface hardness.
- the weight average molecular weight Mw and the number average molecular weight Mn are values calculated by converting a chart measured by gel permeation chromatography to the molecular weight of standard polymethyl methacrylate.
- the method for producing the methacrylic resin used in the present invention is not particularly limited.
- it can be produced by a known polymerization reaction such as a radical polymerization reaction or an anionic polymerization reaction.
- a methacrylic resin having a desired characteristic value (for example, weight average molecular weight) can be specifically adjusted by adjusting polymerization conditions, specifically, polymerization temperature, polymerization time, type and amount of chain transfer agent, type of polymerization initiator. Or by adjusting the amount.
- a radical polymerization reaction In the production of methacrylic resin, it is preferable to use a radical polymerization reaction.
- a suspension polymerization method When a radical polymerization reaction is used, a suspension polymerization method, a bulk polymerization method, a solution polymerization method, or an emulsion polymerization method can be selected.
- the bulk polymerization method is preferable because of less contamination of impurities.
- the bulk polymerization method is preferably performed by a continuous flow method.
- the method for producing a methacrylic resin used in the present invention preferably includes bulk polymerization of a monomer mixture containing a methyl methacrylate monomer and, if necessary, an acrylate monomer.
- the amount of the acrylate monomer used is increased, the fluidity of the methacrylic resin composition of the present invention increases and the melt flow rate R tends to increase.
- the amount of acrylate monomer used is reduced, the absolute value of ⁇ YI tends to decrease, but if the amount of acrylate monomer used is reduced too much, the methacrylic resin composition of the present invention is decomposed by heat. As a result, the absolute value of ⁇ YI may increase.
- the polymerization reaction is performed using a polymerization initiator, a predetermined monomer, and a chain transfer agent as necessary.
- the temperature during the polymerization is preferably 100 to 150 ° C, more preferably 120 to 140 ° C.
- the heat resistance of the methacrylic resin composition of the present invention tends to increase and the absolute value of ⁇ YI tends to decrease.
- the absolute value of ⁇ YI tends to decrease as the amount of the polymerization initiator is decreased and the amount of the chain transfer agent is increased.
- the polymerization initiator used in the present invention is not particularly limited. Examples thereof include azo polymerization initiators such as azobisisobutyronitrile; peroxide polymerization initiators such as t-hexylperoxyisopropyl monocarbonate.
- the polymerization initiator used in the present invention preferably has a half-life of 1 second to 1 minute at the temperature during polymerization. If the amount of the polymerization initiator used is small, the absolute value of ⁇ YI in the methacrylic resin composition of the present invention tends to be small.
- the amount of azobisisobutyronitrile is preferably 0.02 parts by mass or less with respect to 100 parts by mass in total of the monomers, More preferably, it is used at 0.002 parts by mass or more and 0.01 parts by mass or less.
- the chain transfer agent used in the present invention is not particularly limited. Examples include mercaptan chain transfer agents such as n-octyl mercaptan and n-dodecyl mercaptan; ⁇ -methylstyrene dimer; terpinolene.
- mercaptan chain transfer agents such as n-octyl mercaptan and n-dodecyl mercaptan; ⁇ -methylstyrene dimer; terpinolene.
- the absolute value of ⁇ YI tends to decrease and the fluidity tends to increase in the methacrylic resin composition of the present invention.
- n-octyl mercaptan is preferably 0.3 mass with respect to a total of 100 mass parts of monomers. Parts by mass to 0.6 parts by mass, more preferably 0.41 parts by mass to 0.55 parts by mass.
- the methacrylic resin composition of the present invention includes an antioxidant, a heat deterioration inhibitor, an ultraviolet absorber, a light stabilizer, a lubricant, a mold release agent, a polymer processing aid, a charge, as long as the effects of the present invention are not impaired. It may contain additives such as an inhibitor, a flame retardant, a dye / pigment, a light diffusing agent, an organic dye, a matting agent, an impact modifier, and a phosphor.
- the antioxidant alone has an effect of preventing oxidative deterioration of the resin in the presence of oxygen.
- phosphorus antioxidants, hindered phenol antioxidants, thioether antioxidants and the like can be mentioned.
- phosphorus-based antioxidants and hindered phenol-based antioxidants are preferable, and the combined use of phosphorus-based antioxidants and hindered phenol-based antioxidants is more preferable.
- a phosphorus antioxidant and a hindered phenol antioxidant are used in combination, it is preferable to use a phosphorus antioxidant / hindered phenol antioxidant at a mass ratio of 0.2 / 1 to 2/1. It is preferable to use 0.5 / 1 to 1/1.
- Examples of phosphorus antioxidants include 2,2-methylenebis (4,6-di-t-butylphenyl) octyl phosphite (manufactured by ADEKA; trade name: ADK STAB HP-10), tris (2,4-di-) t-Butylphenyl) phosphite (manufactured by BASF; trade name: IRUGAFOS168), 3,9-bis (2,6-di-t-butyl-4-methylphenoxy) -2,4,8,10-tetraoxa-3 , 9-diphosphaspiro [5.5] undecane (manufactured by ADEKA; trade name: ADK STAB PEP-36).
- pentaerythrityl-tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate] (manufactured by BASF; trade name IRGANOX 1010), octadecyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate (manufactured by BASF; trade name IRGANOX1076) is preferred.
- the thermal degradation inhibitor can prevent thermal degradation of the resin by trapping polymer radicals that are generated when exposed to high heat in a substantially oxygen-free state.
- the thermal degradation inhibitor include 2-t-butyl-6- (3′-t-butyl-5′-methyl-hydroxybenzyl) -4-methylphenyl acrylate (manufactured by Sumitomo Chemical Co., Ltd .; trade name Sumilizer GM), 2,4-di-t-amyl-6- (3 ′, 5′-di-t-amyl-2′-hydroxy- ⁇ -methylbenzyl) phenyl acrylate (manufactured by Sumitomo Chemical Co., Ltd .; trade name Sumilyzer GS) is preferable. .
- the ultraviolet absorber is a compound having an ability to absorb ultraviolet rays, and is mainly said to have a function of converting light energy into heat energy.
- the ultraviolet absorber include benzophenones, benzotriazoles, triazines, benzoates, salicylates, cyanoacrylates, succinic anilides, malonic esters, formamidines, and the like.
- benzotriazoles, triazines, or ultraviolet absorbers having a maximum molar extinction coefficient ⁇ max at a wavelength of 380 to 450 nm of 100 dm 3 ⁇ mol ⁇ 1 cm ⁇ 1 or less are preferable.
- Benzotriazoles are preferable as ultraviolet absorbers used when the molded article of the present invention is applied to optical applications because it has a high effect of suppressing deterioration of optical properties such as coloring caused by ultraviolet exposure.
- benzotriazoles include 2- (2H-benzotriazol-2-yl) -4- (1,1,3,3-tetramethylbutyl) phenol (manufactured by BASF; trade name TINUVIN329), 2- (2H- Benzotriazol-2-yl) -4,6-bis (1-methyl-1-phenylethyl) phenol (manufactured by BASF; trade name TINUVIN234), 2,2′-methylenebis [6- (2H-benzotriazole-2) -Yl) -4-t-octylphenol] (manufactured by ADEKA; LA-31) is preferred.
- the ultraviolet absorber having the maximum molar extinction coefficient ⁇ max at wavelengths of 380 to 450 nm of 1200 dm 3 ⁇ mol ⁇ 1 cm ⁇ 1 or less can suppress discoloration of the obtained molded product.
- examples of such an ultraviolet absorber include 2-ethyl-2′-ethoxy-oxalanilide (manufactured by Clariant Japan, trade name: Sundebore VSU).
- benzotriazoles are preferably used from the viewpoint of suppressing resin degradation due to ultraviolet irradiation.
- a triazine UV absorber is preferably used.
- examples of such an ultraviolet absorber include 2,4,6-tris (2-hydroxy-4-hexyloxy-3-methylphenyl) -1,3,5-triazine (manufactured by ADEKA; LA-F70), Examples thereof include hydroxyphenyltriazine-based ultraviolet absorbers (manufactured by BASF; TINUVIN477 and TINUVIN460).
- the light stabilizer is a compound that is said to have a function of capturing radicals generated mainly by oxidation by light.
- Suitable light stabilizers include hindered amines such as compounds having a 2,2,6,6-tetraalkylpiperidine skeleton.
- the lubricant examples include stearic acid, behenic acid, stearamide acid, methylene bisstearamide, hydroxystearic acid triglyceride, paraffin wax, ketone wax, octyl alcohol, and hardened oil.
- the melt flow rate R of the methacrylic resin composition of the present invention tends to increase and the fluidity tends to increase.
- the mold release agent is a compound having a function of facilitating separation of the molded product from the mold.
- the mold release agent include higher alcohols such as cetyl alcohol and stearyl alcohol; glycerin higher fatty acid esters such as stearic acid monoglyceride and stearic acid diglyceride.
- the mass ratio of higher alcohols / glycerin fatty acid monoester is preferably 2.5 / 1 to 3.5 / 1, and preferably 2.8. More preferably, it is used in the range of / 1 to 3.2 / 1.
- polymer particles having a particle diameter of 0.05 to 0.5 ⁇ m can be used.
- the polymer particles may be single layer particles composed of polymers having a single composition ratio and single intrinsic viscosity, or multilayer particles composed of two or more kinds of polymers having different composition ratios or intrinsic viscosities. May be.
- particles having a two-layer structure having a polymer layer having a low intrinsic viscosity in the inner layer and a polymer layer having a high intrinsic viscosity of 5 dl / g or more in the outer layer are preferable.
- the polymer processing aid preferably has an intrinsic viscosity of 3 to 6 dl / g.
- the amount of the polymer processing aid used is preferably 0.1 parts by mass or more and 5 parts by mass or less with respect to 100 parts by mass of the methacrylic resin. Good processing characteristics are obtained when the amount of the polymer processing aid used is 0.1 parts by mass or more, and surface smoothness is good when the amount of the polymer processing aid used is 5 parts by mass or less.
- the impact resistance modifier examples include a core-shell type modifier containing acrylic rubber or diene rubber as a core layer component; a modifier containing a plurality of rubber particles.
- the organic dye a compound having a function of converting ultraviolet rays that are harmful to the resin into visible light is preferably used.
- the light diffusing agent and matting agent include glass fine particles, polysiloxane-based crosslinked fine particles, crosslinked polymer fine particles, talc, calcium carbonate, and barium sulfate.
- the phosphor examples include a fluorescent pigment, a fluorescent dye, a fluorescent white dye, a fluorescent brightener, and a fluorescent bleach.
- additives may be used alone or in combination of two or more. These additives may be added when the methacrylic resin is produced, or may be added to the produced methacrylic resin.
- the total amount of additives contained in the methacrylic resin composition of the present invention is preferably 7% by mass or less, more preferably 5% by mass or less, based on the methacrylic resin, from the viewpoint of suppressing poor appearance of the molded product. More preferably, it is 4 mass% or less.
- the methacrylic resin composition of the present invention may contain a polymer other than the methacrylic resin as long as the effects of the present invention are not impaired.
- Other polymers include polyolefin resins such as polyethylene, polypropylene, polybutene-1, poly-4-methylpentene-1, polynorbornene; polystyrene, styrene-maleic anhydride copolymer, high impact polystyrene, AS resin, ABS Styrene resins such as resin, AES resin, AAS resin, ACS resin, MBS resin; methyl methacrylate-styrene copolymer; polyester resin such as polyethylene terephthalate and polybutylene terephthalate; polyamide such as nylon 6, nylon 66, polyamide elastomer; Polycarbonate, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, ethylene-vinyl alcohol copolymer, polyacetal, polyvinylidene fluoride
- the methacrylic resin composition of the present invention comprises a yellow index (YI4) having an optical path length of 200 mm obtained by injection at a cylinder temperature of 280 ° C. and a molding cycle of 4 minutes, and an injection molding obtained at a cylinder temperature of 280 ° C. and a molding cycle of 2 minutes.
- the absolute value of the difference ( ⁇ YI) from the yellow index (YI2) of the optical path length of 200 mm of the product is 3 or less, preferably 2.7 or less.
- the yellow index is an XYZ value according to the method described in JIS Z 8722 from the measured values obtained by measuring the light transmittance at a wavelength of 340 nm to 700 nm every 1 nm with a C light source. Is a value calculated according to the method described in JIS K 7105.
- the lower limit of the melt flow rate R measured at 230 ° C. under a load of 3.8 kg is preferably 11 g / 10 minutes, more preferably 15 g / 10 minutes, and the upper limit of R is preferably Is 40 g / 10 min, and R is more than 0.8 times greater than E and less than 1.2 times, preferably more than 0.85 times greater than E and less than 1.15 times.
- P is the polymerization degree of the methacrylic resin used in the methacrylic resin composition of the present invention.
- the degree of polymerization P of the methacrylic resin is calculated from the intrinsic viscosity ⁇ (chloroform, 20 ° C.) based on the Houwink-Mark-Sakurada formula (formula (D)), and the molecular weight M is calculated based on the molecular weight of methyl methacrylate (100 g / mol)).
- Formula (D): ⁇ 4.85 ⁇ 10 ⁇ 5 ⁇ M 0.80
- Formula (E): P M / 100
- the melt flow rate is measured under the conditions of 230 ° C., 3.8 kg load, and 10 minutes in accordance with JIS K 7210.
- the range of the melt flow rate R of the methacrylic resin composition of the present invention can be represented by the formulas (B) and (C), and preferably can be represented by the formulas (B 1 ) and (C 1 ).
- Formula (A): E exp (0.17112 ⁇ W ⁇ 0.00399 ⁇ P + 5.09713)
- e is the base of the natural logarithm, that is, the Napier number.
- Formula (A) is a methacrylic resin that can be used in the present invention, and data on the degree of polymerization of the methacrylic resin, the ratio of the acrylate monomer units of the methacrylic resin, and the melt flow rate of the methacrylic resin. Determined by statistical processing. Therefore, E may be regarded as the center value of the melt flow rate range in which a good injection molded product can be obtained from a methacrylic resin having a polymerization degree of P and a ratio of acrylic acid ester monomer units of W.
- the methacrylic resin composition of the present invention is excellent in fluidity. Therefore, a plate having a thickness of 1 mm or less, which is a suitable application of the methacrylic resin composition of the present invention, can be molded satisfactorily. Moreover, if the value of the melt flow rate R is large, it is possible to suppress shearing heat generation during injection molding, to suppress injection pressure, and to suppress coloring during molding. In order to increase the melt flow rate to 11 g / 10 min or more, it is adjusted by increasing the amount of the acrylate monomer, decreasing the molecular weight, or adding a plasticizing additive such as a lubricant.
- the methacrylic resin composition of the present invention can be obtained by, for example, a melt mixing method or a solution mixing method.
- a melt mixing method for example, a known mixing apparatus or kneading apparatus such as a kneader ruder, a single screw extruder, a twin screw extruder, a mixing roll, or a Banbury mixer can be used. Of these, a twin screw extruder is preferred.
- the melt mixing method is preferably performed in an inert gas atmosphere such as nitrogen gas, argon gas, or helium gas.
- the temperature at the time of mixing and kneading can be appropriately adjusted according to the melting temperature of the methacrylic resin to be used, but is preferably 110 ° C to 300 ° C.
- the solution mixing method can be performed using an organic solvent capable of dissolving methacrylic resin and other polymers. Examples of the organic solvent include dichloromethane, tetrahydrofuran, methyl ethyl ket
- the methacrylic resin composition of the present invention can be in any form such as pellets, granules, and powders in order to enhance convenience such as transportation and storage.
- the molded product of the present invention can be obtained by molding the methacrylic resin composition of the present invention.
- the molding can be performed by a known method such as injection molding, compression molding, extrusion molding, vacuum molding, or cast molding. Of these, injection molding is preferred.
- the methacrylic resin composition of the present invention can provide a thin and wide-area molded product with high production efficiency with little residual distortion and little coloring even when injection molding is performed at a low cylinder temperature and a high injection pressure. it can.
- the maximum value of the ratio of the resin flow length to the thickness of a mold that can be used in injection molding is preferably 450 or more.
- the methacrylic resin composition of the present invention is suitable for producing a thin molded product.
- the molded article in a preferred form of the present invention is a plate having a thickness of preferably 1 mm or less, more preferably 0.5 mm or less, still more preferably 0.45 mm or less, and particularly preferably 0.4 mm or less.
- the methacrylic resin composition of the present invention can be made into various molded products. Molded products include, for example, billboard parts such as advertising towers, stand signs, sleeve signs, bamboard signs, and rooftop signs; display parts such as showcases, dividers, and store displays; fluorescent lamp covers, mood lighting covers, lamp shades, Lighting parts such as optical ceilings, light walls, chandeliers; interior parts such as pendants and mirrors; building parts such as doors, domes, safety window glass, partitions, staircases, balconies, roofs of leisure buildings; aircraft windshields , Pilot visor, motorcycle, motor boat windshield, bus shading plate, automotive side visor, rear visor, head wing, headlight cover and other transportation equipment related parts; audio visual nameplate, stereo cover, TV protection mask, vending machine Electronic equipment parts such as incubators, X-ray parts, etc.
- billboard parts such as advertising towers, stand signs, sleeve signs, bamboard signs, and rooftop signs
- display parts such as showcases, dividers, and store displays
- Medical equipment parts such as machine covers, instrument covers, experimental devices, rulers, dials, observation windows; LCD protective plates, light guide plates, light guide films, Fresnel lenses, lenticular lenses, front plates of various displays, diffusion Optical components such as plates, polarizer protective films, polarizing plate protective films, retardation films, etc .; traffic-related components such as road signs, guide plates, curve mirrors, and sound barriers; surface materials for automobile interiors, surface materials for mobile phones, Film members such as marking films; canopy materials for washing machines, control panels, top panels for rice cookers, etc .; greenhouses, large aquariums, box aquariums, clock panels, bathtubs, sanitary, desk mats, games Examples include parts, toys, and masks for face protection during welding.
- the methacrylic resin composition of the present invention is suitable for an optical member, and among the optical members, it is suitable for a light guide.
- the light guide is used as one member of a backlight of a liquid crystal display element, for example.
- the light from the light source on the side surface or the back surface is guided so that light can be emitted uniformly from the entire plate surface.
- the plate surface of the light guide may be provided with unevenness of micron size for emitting light uniformly.
- the light guide can be made thin (1 mm or less) and has a large area, and the fine shape for the micron-size irregularities engraved on the mold stamper is faithfully reproduced. be able to.
- Melt flow rate R Based on JIS K7210, it measured on 230 degreeC, the 3.8kg load, and the conditions for 10 minutes.
- XYZ values were determined according to the method described in JIS Z 8722, and the yellow index (YI) was calculated according to the method described in JIS K 7105.
- the difference ( ⁇ YI) between the yellow index (YI4) obtained in the molding cycle of 4 minutes and the yellow index (YI2) obtained in the molding cycle of 2 minutes was calculated.
- Examples 1 to 4 and Comparative Examples 1 to 8 In an autoclave A with a stirrer, purified methyl methacrylate (MMA), methyl acrylate (MA), 2,2′-azobis (2-methylpropionitrile) (AIBN) and n-octyl mercaptan (n-OM) ) At a ratio shown in Tables 1 and 2 and uniformly dissolved to obtain a raw material liquid (I).
- the raw material liquid (I) is supplied from the autoclave A to a tank reactor controlled at a temperature of 140 ° C. at 1.5 kg / hr, and bulk polymerization is performed with an average residence time of 120 minutes.
- the reaction solution containing was continuously discharged.
- the polymerization conversion rate of the obtained polymer was 57% by mass.
- the reaction solution was heated to 230 ° C. and supplied to a twin screw extruder controlled at 240 ° C.
- the twin-screw extruder volatile components mainly composed of unreacted monomers were separated and removed, and the polymer was extruded as a strand.
- the strand was cut with a pelletizer to obtain resin pellets.
- the weight average molecular weight Mw, the molecular weight distribution Mw / Mn, the ratio W of MA units, the polymerization degree P, the melt flow rate R, and the yellow index difference ⁇ YI were measured.
- injection moldability, fluidity, and mold contamination were evaluated using resin pellets. The results are shown in Tables 1 and 2.
- the raw material liquid (I) is supplied to a first tank type reactor controlled at a temperature of 140 ° C. at 1.5 kg / hr, bulk polymerization is carried out with an average residence time of 90 minutes, and the first tank type at 1.5 kg / hr.
- the reaction liquid (a) containing the polymer was continuously discharged from the reactor.
- the polymerization conversion rate of the obtained polymer was 35% by mass, and the degree of polymerization was 870.
- the reaction solution (a) and the raw material liquid (II) were combined and supplied to a second tank reactor controlled at a temperature of 140 ° C. at 1.5 kg / hr, and the average residence time was 90 minutes. Bulk polymerization was performed, and the reaction liquid (b) containing the polymer was discharged from the second tank reactor at 1.5 kg / hr. The polymerization conversion rate of the obtained polymer was 57% by mass. Following this, the reaction liquid (b) was heated to 230 ° C. and supplied to a twin-screw extruder controlled at 240 ° C.
- Comparative Example 10 In a twin-screw extruder, when volatile components mainly composed of unreacted monomers are separated and removed, and the polymer is extruded as a strand, 0.40 parts by mass of stearyl alcohol and stearin are added to 100 parts by mass of the polymer. Resin pellets were obtained in the same manner as in Example 1 except that 0.10 parts by mass of acid monoglyceride was added. Using the resin pellets, the weight average molecular weight Mw, the molecular weight distribution Mw / Mn, the ratio W of MA units, the polymerization degree P, the melt flow rate R, and the yellow index difference ⁇ YI were measured. Furthermore, injection moldability, fluidity, and mold contamination were evaluated using resin pellets. The results are shown in Table 2.
- the resin compositions obtained in Examples 1 to 4 had high fluidity, excellent injection moldability, and did not cause mold stains. As a result, the molded articles obtained in Examples 1 to 4 were excellent in transparency, heat resistance, mechanical strength, appearance, and the like. On the other hand, the resin compositions obtained in Comparative Examples 1 to 10 had low fluidity, poor injection moldability, and mold fouling. As a result, the molded products obtained in Comparative Examples 1 to 10 were inferior in at least one of heat resistance, mechanical strength, appearance, and the like.
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Abstract
Description
薄肉の成形品を得るためには、メタクリル樹脂が溶融時に高い流動性を有することが必要である。樹脂の流動性を高める方策としては、軟化温度またはガラス転移温度を下げること、分子量を下げること、分子量分布を広くすることなどが、一般に知られている。しかし、これらの方策をメタクリル樹脂に適用すると、耐熱性の低下、力学強度の低下などを引き起こす。このようなことを考慮して、引用文献1~4は、様々なメタクリル樹脂の製造方法を提案している。
〔1〕 メタクリル酸メチル単量体単位95~100質量%とアクリル酸エステル単量体単位0~5質量%とを含んで成り、
重量平均分子量Mwが57000~90000であり、
数平均分子量Mnに対する重量平均分子量Mwの比Mw/Mnが1.9以下であるメタクリル樹脂を90質量%以上含み、
シリンダ温度280℃および成形サイクル4分間で得られる射出成形品の光路長200mmのイエロインデックス(YI4)と、シリンダ温度280℃および成形サイクル2分間で得られる射出成形品の光路長200mmのイエロインデックス(YI2)との差の絶対値が3以下であり、且つ
式(B)および式(C)の関係を満たすメタクリル樹脂組成物。
式(B): R ≧ 11
式(C): 0.8 < R/E < 1.2
[ただし、Rはメタクリル樹脂組成物の230℃、3.8kg荷重で測定したメルトフローレート(単位:g/10分)である。Eは式(A): E=exp(0.17112×W-0.00399×P+5.09713) で算出される値(単位:g/10分)である。Wは前記メタクリル樹脂の全単量体単位に対するアクリル酸エステル単量体単位の割合(単位:質量%)である。Pは前記メタクリル樹脂の重合度である。]
〔3〕 前記〔1〕に記載のメタクリル樹脂組成物からなる厚さ1mm以下の板。
シリンダ温度280℃および成形サイクル4分間で得られる射出成形品の光路長200mmのイエロインデックス(YI4)と、シリンダ温度280℃および成形サイクル2分間で得られる射出成形品の光路長200mmのイエロインデックス(YI2)との差の絶対値が3以下であり、且つ式(B)および式(C)の関係を満たすメタクリル樹脂組成物を射出成形することを含む、射出成形品の製造方法。
式(B): R ≧ 11
式(C): 0.8 < R/E < 1.2
[ただし、Rはメタクリル樹脂組成物の230℃、3.8kg荷重で測定したメルトフローレート(単位:g/10分)である。Eは式(A): E=exp(0.17112×W-0.00399×P+5.09713) で算出される値(単位:g/10分)である。Wは前記メタクリル樹脂の全単量体単位に対するアクリル酸エステル単量体単位の割合(単位:質量%)である。Pは前記メタクリル樹脂の重合度である。]
メタクリル酸メチル単量体単位の含有量は、95~100質量%、好ましくは95~98質量%、より好ましくは95~96質量%である。アクリル酸エステル単量体単位の含有量は、0~5質量%、好ましくは2~5質量%、より好ましくは4~5質量%である。
メタクリル酸メチル単量体単位の含有量が上記の範囲内にあると、シリンダ温度280℃および成形サイクル4分間で得られる射出成形品の光路長200mmのイエロインデックス(YI4)が小さく、成形時の熱により着色し難い。
本発明に用いられるメタクリル樹脂は、数平均分子量Mnに対する重量平均分子量Mwの比Mw/Mnが1.9以下、好ましくは1.7以上1.8以下である。重量平均分子量が上記の範囲内であっても、低分子量の重合体成分の割合が多いなどのためにMw/Mnが1.9を超える場合、得られる成形品は脆く、表面硬度が低い。重量平均分子量Mwおよび数平均分子量Mnは、ゲルパーミエーションクロマトグラフィーによって測定されたチャートを標準ポリメチルメタクリレートの分子量に換算して算出した値である。
重合反応は、重合開始剤と、所定の単量体と、必要に応じて連鎖移動剤などとを用いて行われる。重合時の温度は好ましくは100~150℃、より好ましくは120~140℃である。重合温度を低くするほど、本発明のメタクリル樹脂組成物の耐熱性が高くなる傾向およびΔYIの絶対値が小さくなる傾向がある。また、重合開始剤の量を減らし且つ連鎖移動剤の量を増やすほど、ΔYIの絶対値が小さくなる傾向がある。
リン系酸化防止剤とヒンダードフェノール系酸化防止剤とを併用する場合、リン系酸化防止剤/ヒンダードフェノール系酸化防止剤を質量比で0.2/1~2/1で使用するのが好ましく、0.5/1~1/1で使用するのがより好ましい。
該熱劣化防止剤としては、2-t-ブチル-6-(3’-t-ブチル-5’-メチル-ヒドロキシベンジル)-4-メチルフェニルアクリレート(住友化学社製;商品名スミライザーGM)、2,4-ジt-アミル-6-(3’,5’-ジ-t-アミル-2’-ヒドロキシ-α-メチルベンジル)フェニルアクリレート(住友化学社製;商品名スミライザーGS)などが好ましい。
紫外線吸収剤としては、ベンゾフェノン類、ベンゾトリアゾール類、トリアジン類、ベンゾエート類、サリシレート類、シアノアクリレート類、蓚酸アニリド類、マロン酸エステル類、ホルムアミジン類などを挙げることができる。これらの中でも、ベンゾトリアゾール類、トリアジン類、または波長380~450nmにおけるモル吸光係数の最大値εmaxが100dm3・mol-1cm-1以下である紫外線吸収剤が好ましい。
これら紫外線吸収剤の中、紫外線被照による樹脂劣化が抑えられるという観点からベンゾトリアゾール類が好ましく用いられる。
ロヘキサン1Lに紫外線吸収剤10.00mgを添加し、目視による観察で未溶解物がないように溶解させる。この溶液を1cm×1cm×3cmの石英ガラスセルに注入し、日立製作所社製U-3410型分光光度計を用いて、波長380~450nm、光路長1cmでの吸光度を測定する。紫外線吸収剤の分子量(MUV)と、測定された吸光度の最大値(Amax)とから次式により計算し、モル吸光係数の最大値εmaxを算出する。
εmax=[Amax/(10×10-3)]×MUV
有機色素としては、樹脂に対しては有害とされている紫外線を可視光線に変換する機能を有する化合物が好ましく用いられる。
光拡散剤や艶消し剤としては、ガラス微粒子、ポリシロキサン系架橋微粒子、架橋ポリマー微粒子、タルク、炭酸カルシウム、硫酸バリウムなどを挙げることができる。
蛍光体として、蛍光顔料、蛍光染料、蛍光白色染料、蛍光増白剤、蛍光漂白剤などを挙げることができる。
メタクリル樹脂の重合度PはHouwink-Mark-桜田の式(式(D))に基づいて極限粘度η(クロロホルム、20℃)から分子量Mを算出し、分子量Mをメタクリル酸メチルの分子量(100g/mol)で除して得られる値である。
式(D): η=4.85×10-5×M0.80
式(E): P=M/100
メルトフローレートはJIS K 7210に準拠して、230℃、3.8kg荷重、10分間の条件で測定する。
すなわち、本発明のメタクリル樹脂組成物のメルトフローレートRの範囲は、式(B)および式(C)で表すことができ、好ましくは式(B1)および(C1)で表すことができる。
式(A): E=exp(0.17112×W-0.00399×P+5.09713)
式(B): R ≧ 11
式(B1): R ≧ 15
式(C): 0.8 < R/E < 1.2
式(C1): 0.85 < R/E < 1.15
ここで、E=exp(0.17112×W-0.00399×P+5.09713)は、E=e(0.17112×W-0.00399×P+5.09713)と同義である。eは自然対数の底、すなわちネイピア数である。
式(C)を満たし、0.8 < R/E < 1.2であると、ΔYIの値を3以下となる射出成形品を得やすい傾向にある。また、例えば、樹脂組成物が滑剤を過剰に含む等により、R/E≧1.2となると、成形時に成形用金型の表面に汚れが発生しやすくなる。
樹脂ペレットをクロロホルムに溶解させて20℃における極限粘度ηを測定した。Houwink-Mark-桜田の式(式(D))に基づいて極限粘度ηから分子量Mを算出した。分子量Mをメタクリル酸メチルの分子量(100g/mol)で除した値を重合度Pとした。
式(D): η=4.85×10-5×M0.80
式(E): P=M/100
樹脂ペレット1gをジクロロメタン40mlに溶解させた。得られた溶液25μlを白金ボードに採取した。ジクロロメタンを除去し、熱分解ガスクロマトグラフィーにより以下の条件で測定した。測定結果に基づいてMA単位の割合Wを算出した。
装置:島津製作所社製 GC-14A
熱分解炉温度:500℃
カラム:SGE BPX-5
温度条件:40℃で5分間保持→5℃/分で280℃まで昇温
島津製作所社製ガスクロマトグラフGC-14Aに、カラムとしてGL Sciences Inc.製INERTCAP1(df=0.4μm、0.25mmI.D.×60m)を繋ぎ、下記の条件にて分析を行い、それに基づいて算出した。
injection温度=250℃
detector温度=250℃
温度条件:60℃で5分間保持→10℃/分で250℃まで昇温→250℃で10分間保持
GPC(ゲル・パーミエイション・クロマトグラフィー)により標準ポリメチルメタクリレート換算分子量で求めた。
装置:東ソー社製GPC装置HLC-8320
分離カラム:東ソー社製のTSKguardcoIumSuperHZ-HとTSKgeIHZM-MとTSKgeISuperHZ4000とを直列に連結
溶離剤:テトラヒドロフラン
溶離剤流量:0.35mI/分
カラム温度:40℃
検出方法:示差屈折率(RI)
JIS K 7210に準拠して、230℃、3.8kg荷重、10分間の条件で測定した。
射出成形機(日本製鋼所社製、J-110ELIII)を使用し、シリンダ温度280℃、金型温度60℃、成形サイクル2分間と4分間の2条件で射出成形して、長さ200mm、幅60mmおよび厚さ6mmの平板をそれぞれ得た。
上記で得られた平板のイエロインデックスを以下の条件で測定した。分光光度計(株式会社島津製作所製、PC-2200)を用い、C光源にて、200mmの光路長における光線透過率を波長340nm~700nmの範囲で1nm毎に測定した。測定値から、JIS Z 8722に記載の方法に準じてXYZ値を求め、JIS K 7105に記載の方法に準じてイエロインデックス(YI)を算出した。成形サイクル4分間で得られたイエロインデックス(YI4)と成形サイクル2分間で得られたイエロインデックス(YI2)との差(ΔYI)を算出した。
射出成形機(住友重機械工業社製:SE-180DU-HP)を使用し、シリンダ温度280℃、金型温度75℃、成形サイクル1分間で射出成形して、長辺205mm、短辺160mm、厚さ0.4mmの平板Sを製造した。平板Sは、厚さに対するゲートからの樹脂流動長さの比が475(=190mm/0.4mm)である。
平板Sの外観を観察し以下の指標で評価した。
○ : 割れおよびヒケがともに無い。
△ : ヒケが有る。
× : 割れが有る。
名機製作所社製「M-100C」射出成形機を用いて、平板金型(成形品寸法:40mm×200mm×2mm)で、成形温度260℃、金型温度60℃、成形サイクル26秒および保圧無し(ショートショット)の条件で、40ショットの射出成形を行なった。金型表面の汚れ具合を調べ、以下の指標で評価した。
○ : 金型汚れ無し。
× : 金型汚れ有り。
住友重機社製SE‐180DU‐HP成形機において、型締圧力180トン、スクリュー径φ36mm、金型温度80℃、成形温度285℃、射出速度400mm/秒、および充填圧力274MPaの条件で、スパイラルフロー金型(製品厚み0.4mm、幅10mm)に射出成形を行った。そのときのスパイラルフロー長さを測定し、流動性を以下の指標で評価した。
○ : 175mm以上
× : 175mm未満
撹拌機付オートクレーブAに、精製されたメタクリル酸メチル(MMA)、アクリル酸メチル(MA)、2,2’-アゾビス(2-メチルプロピオニトリル)(AIBN)およびn-オクチルメルカプタン(n-OM)を表1および表2に記載の割合で仕込み、均一に溶解させて原料液(I)を得た。
原料液(I)を、オートクレーブAから1.5kg/hrで、温度140℃に制御された槽型反応器に供給し、平均滞留時間120分間で塊状重合を行い、槽型反応器から重合体を含む反応液を連続的に排出した。得られた重合体の重合転化率は57質量%であった。
次いで、前記反応液を230℃に加温し、240℃に制御された二軸押出機に供給した。該二軸押出機において未反応単量体を主成分とする揮発分を分離除去して、重合体をストランドにして押し出した。該ストランドをペレタイザーでカットし、樹脂ペレットを得た。樹脂ペレットを用いて、重量平均分子量Mw、分子量分布Mw/Mn、MA単位の割合W、重合度P、メルトフローレートR、およびイエロインデックス差ΔYIを測定した。さらに樹脂ペレットを用いて射出成形性、流動性、および金型汚れの評価を行った。その結果を表1および表2に示す。
撹拌機付オートクレーブAに、精製されたメタクリル酸メチル、アクリル酸メチル、2,2’-アゾビス(2-メチルプロピオニトリル)およびn-オクチルメルカプタンを表2に記載の割合で仕込み、均一に溶解させて原料液(I)を得た。
また、オートクレーブBに、2,2’-アゾビス(2-メチルプロピオニトリル)およびn-オクチルメルカプタンを表2記載の割合で仕込み、ごく少量のメタクリル酸メチルで溶解させて、原料液(II)を得た。
これに続けて、反応液(b)を230℃に加温し、240℃に制御された二軸押出機に供給した。該二軸押出機において未反応単量体を主成分とする揮発分を分離除去して、重合体をストランドにして押し出した。該ストランドをペレタイザーでカットし、樹脂ペレットを得た。樹脂ペレットを用いて、重量平均分子量Mw、分子量分布Mw/Mn、MA単位の割合W、重合度P、メルトフローレートR、およびイエロインデックス差ΔYIを測定した。さらに樹脂ペレットを用いて射出成形性、流動性、および金型汚れの評価を行った。その結果を表2に示す。
二軸押出機において未反応単量体を主成分とする揮発分を分離除去して、重合体をストランドにして押し出す際に、重合体100質量部に対してステアリルアルコール0.40質量部およびステアリン酸モノグリセリド0.10質量部を添加した以外は実施例1と同じ方法で樹脂ペレットを得た。樹脂ペレットを用いて、重量平均分子量Mw、分子量分布Mw/Mn、MA単位の割合W、重合度P、メルトフローレートR、およびイエロインデックス差ΔYIを測定した。さらに樹脂ペレットを用いて射出成形性、流動性、および金型汚れの評価を行った。その結果を表2に示す。
Claims (5)
- メタクリル酸メチル単量体単位95~100質量%とアクリル酸エステル単量体単位0~5質量%とを含んで成り、重量平均分子量Mwが57000~90000であり、且つ数平均分子量Mnに対する重量平均分子量Mwの比Mw/Mnが1.9以下であるメタクリル樹脂を90質量%以上含み、
シリンダ温度280℃および成形サイクル4分間で得られる射出成形品の光路長200mmのイエロインデックス(YI4)と、シリンダ温度280℃および成形サイクル2分間で得られる射出成形品の光路長200mmのイエロインデックス(YI2)との差の絶対値が3以下であり、且つ
式(B)および式(C)の関係を満たすメタクリル樹脂組成物。
式(B): R ≧ 11
式(C): 0.8 < R/E < 1.2
[ただし、Rはメタクリル樹脂組成物の230℃、3.8kg荷重で測定したメルトフローレート(単位:g/10分)である。Eは式(A): E=exp(0.17112×W-0.00399×P+5.09713) で算出される値(単位:g/10分)である。Wは前記メタクリル樹脂の全単量体単位に対するアクリル酸エステル単量体単位の割合(単位:質量%)である。Pは前記メタクリル樹脂の重合度である。] - 請求項1に記載のメタクリル樹脂組成物からなる射出成形品。
- 請求項1に記載のメタクリル樹脂組成物からなる厚さ1mm以下の板。
- メタクリル酸メチル単量体とアクリル酸エステル単量体とを含む単量体混合物を塊状重合することを含む請求項1に記載のメタクリル樹脂組成物の製造方法。
- メタクリル酸メチル単量体単位95~100質量%とアクリル酸エステル単量体単位0~5質量%とを含んで成り、重量平均分子量Mwが57000~90000であり、且つ数平均分子量Mnに対する重量平均分子量Mwの比Mw/Mnが1.9以下であるメタクリル樹脂を90質量%以上含み、
シリンダ温度280℃および成形サイクル4分間で得られる射出成形品の光路長200mmのイエロインデックス(YI4)と、シリンダ温度280℃および成形サイクル2分間で得られる射出成形品の光路長200mmのイエロインデックス(YI2)との差の絶対値が3以下であり、且つ
式(B)および式(C)の関係を満たすメタクリル樹脂組成物
を射出成形することを含む、射出成形品の製造方法。
式(B): R ≧ 11
式(C): 0.8 < R/E < 1.2
[ただし、Rはメタクリル樹脂組成物の230℃、3.8kg荷重で測定したメルトフローレート(単位:g/10分)である。Eは式(A): E=exp(0.17112×W-0.00399×P+5.09713) で算出される値(単位:g/10分)である。Wは前記メタクリル樹脂の全単量体単位に対するアクリル酸エステル単量体単位の割合(単位:質量%)である。Pは前記メタクリル樹脂の重合度である。]
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