JP7153655B2 - 重荷重タイヤ用ゴム組成物およびタイヤ - Google Patents
重荷重タイヤ用ゴム組成物およびタイヤ Download PDFInfo
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- JP7153655B2 JP7153655B2 JP2019539575A JP2019539575A JP7153655B2 JP 7153655 B2 JP7153655 B2 JP 7153655B2 JP 2019539575 A JP2019539575 A JP 2019539575A JP 2019539575 A JP2019539575 A JP 2019539575A JP 7153655 B2 JP7153655 B2 JP 7153655B2
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- Prior art keywords
- rubber
- rubber composition
- mass
- liquid diene
- heavy duty
- Prior art date
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- 229920001971 elastomer Polymers 0.000 title claims description 173
- 239000005060 rubber Substances 0.000 title claims description 173
- 239000000203 mixture Substances 0.000 title claims description 121
- 239000007788 liquid Substances 0.000 claims description 121
- 229920003244 diene elastomer Polymers 0.000 claims description 107
- -1 silane compound Chemical class 0.000 claims description 67
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 60
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical group C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 claims description 47
- 239000000945 filler Substances 0.000 claims description 46
- 125000000524 functional group Chemical group 0.000 claims description 45
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 36
- 229920000642 polymer Polymers 0.000 claims description 34
- 239000007787 solid Substances 0.000 claims description 34
- 239000000377 silicon dioxide Substances 0.000 claims description 30
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 29
- 229920002554 vinyl polymer Polymers 0.000 claims description 27
- 239000006229 carbon black Substances 0.000 claims description 26
- 244000043261 Hevea brasiliensis Species 0.000 claims description 23
- 239000000178 monomer Substances 0.000 claims description 23
- 229920003052 natural elastomer Polymers 0.000 claims description 23
- 229920001194 natural rubber Polymers 0.000 claims description 23
- 229910000077 silane Inorganic materials 0.000 claims description 21
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical group CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 claims description 20
- 229920002857 polybutadiene Polymers 0.000 claims description 15
- 239000005062 Polybutadiene Substances 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 13
- 229920003049 isoprene rubber Polymers 0.000 claims description 12
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 11
- 239000011324 bead Substances 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 8
- 239000000155 melt Substances 0.000 claims description 7
- 125000004432 carbon atom Chemical group C* 0.000 claims description 6
- 238000004132 cross linking Methods 0.000 claims description 6
- 125000000951 phenoxy group Chemical group [H]C1=C([H])C([H])=C(O*)C([H])=C1[H] 0.000 claims description 6
- 125000002947 alkylene group Chemical group 0.000 claims description 4
- 125000001301 ethoxy group Chemical group [H]C([H])([H])C([H])([H])O* 0.000 claims description 4
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 claims description 4
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 claims description 3
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 3
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 3
- 238000006116 polymerization reaction Methods 0.000 description 45
- 150000001875 compounds Chemical class 0.000 description 35
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 31
- 150000001993 dienes Chemical class 0.000 description 30
- 239000003795 chemical substances by application Substances 0.000 description 26
- 238000000034 method Methods 0.000 description 26
- 239000002174 Styrene-butadiene Substances 0.000 description 25
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 24
- 235000019241 carbon black Nutrition 0.000 description 24
- 239000003054 catalyst Substances 0.000 description 22
- 238000004519 manufacturing process Methods 0.000 description 22
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 18
- 239000000243 solution Substances 0.000 description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 16
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 14
- 238000004073 vulcanization Methods 0.000 description 14
- 229910052783 alkali metal Inorganic materials 0.000 description 13
- 238000005227 gel permeation chromatography Methods 0.000 description 13
- 150000001339 alkali metal compounds Chemical class 0.000 description 12
- 238000005096 rolling process Methods 0.000 description 11
- 239000002904 solvent Substances 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 10
- 239000000446 fuel Substances 0.000 description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 9
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 9
- 150000001340 alkali metals Chemical class 0.000 description 9
- 230000003712 anti-aging effect Effects 0.000 description 9
- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- MZRVEZGGRBJDDB-UHFFFAOYSA-N N-Butyllithium Chemical compound [Li]CCCC MZRVEZGGRBJDDB-UHFFFAOYSA-N 0.000 description 8
- 238000005259 measurement Methods 0.000 description 8
- 239000000126 substance Substances 0.000 description 8
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 7
- 125000002897 diene group Chemical group 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 238000010528 free radical solution polymerization reaction Methods 0.000 description 7
- 230000000704 physical effect Effects 0.000 description 7
- 238000005406 washing Methods 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 6
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 6
- 230000009477 glass transition Effects 0.000 description 6
- 229910052747 lanthanoid Inorganic materials 0.000 description 6
- 239000003607 modifier Substances 0.000 description 6
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 6
- 239000003960 organic solvent Substances 0.000 description 6
- 239000007870 radical polymerization initiator Substances 0.000 description 6
- 229910052761 rare earth metal Inorganic materials 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- 238000003756 stirring Methods 0.000 description 6
- 229910052717 sulfur Inorganic materials 0.000 description 6
- 239000011593 sulfur Substances 0.000 description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 5
- 239000004606 Fillers/Extenders Substances 0.000 description 5
- 239000004793 Polystyrene Substances 0.000 description 5
- 235000021355 Stearic acid Nutrition 0.000 description 5
- 238000007259 addition reaction Methods 0.000 description 5
- 239000003963 antioxidant agent Substances 0.000 description 5
- 235000006708 antioxidants Nutrition 0.000 description 5
- 238000010556 emulsion polymerization method Methods 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 5
- 239000003921 oil Substances 0.000 description 5
- 150000001451 organic peroxides Chemical class 0.000 description 5
- 239000002685 polymerization catalyst Substances 0.000 description 5
- 229920002223 polystyrene Polymers 0.000 description 5
- 150000003839 salts Chemical class 0.000 description 5
- 239000008117 stearic acid Substances 0.000 description 5
- 238000005160 1H NMR spectroscopy Methods 0.000 description 4
- RGSFGYAAUTVSQA-UHFFFAOYSA-N Cyclopentane Chemical compound C1CCCC1 RGSFGYAAUTVSQA-UHFFFAOYSA-N 0.000 description 4
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 4
- KWYHDKDOAIKMQN-UHFFFAOYSA-N N,N,N',N'-tetramethylethylenediamine Chemical compound CN(C)CCN(C)C KWYHDKDOAIKMQN-UHFFFAOYSA-N 0.000 description 4
- 229920000459 Nitrile rubber Polymers 0.000 description 4
- OFBQJSOFQDEBGM-UHFFFAOYSA-N Pentane Chemical compound CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 4
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 239000003568 Sodium, potassium and calcium salts of fatty acids Substances 0.000 description 4
- MOYAFQVGZZPNRA-UHFFFAOYSA-N Terpinolene Chemical compound CC(C)=C1CCC(C)=CC1 MOYAFQVGZZPNRA-UHFFFAOYSA-N 0.000 description 4
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 4
- 150000001342 alkaline earth metals Chemical class 0.000 description 4
- 230000003078 antioxidant effect Effects 0.000 description 4
- 125000003118 aryl group Chemical group 0.000 description 4
- 229910052796 boron Inorganic materials 0.000 description 4
- 238000005345 coagulation Methods 0.000 description 4
- 230000015271 coagulation Effects 0.000 description 4
- 239000003431 cross linking reagent Substances 0.000 description 4
- GHVNFZFCNZKVNT-UHFFFAOYSA-N decanoic acid Chemical compound CCCCCCCCCC(O)=O GHVNFZFCNZKVNT-UHFFFAOYSA-N 0.000 description 4
- JQVDAXLFBXTEQA-UHFFFAOYSA-N dibutylamine Chemical compound CCCCNCCCC JQVDAXLFBXTEQA-UHFFFAOYSA-N 0.000 description 4
- 239000002612 dispersion medium Substances 0.000 description 4
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 description 4
- 239000003995 emulsifying agent Substances 0.000 description 4
- IPCSVZSSVZVIGE-UHFFFAOYSA-N hexadecanoic acid Chemical compound CCCCCCCCCCCCCCCC(O)=O IPCSVZSSVZVIGE-UHFFFAOYSA-N 0.000 description 4
- 229930195733 hydrocarbon Natural products 0.000 description 4
- QWTDNUCVQCZILF-UHFFFAOYSA-N isopentane Chemical compound CCC(C)C QWTDNUCVQCZILF-UHFFFAOYSA-N 0.000 description 4
- 239000004816 latex Substances 0.000 description 4
- 229920000126 latex Polymers 0.000 description 4
- 150000002642 lithium compounds Chemical class 0.000 description 4
- 150000002739 metals Chemical class 0.000 description 4
- GDOPTJXRTPNYNR-UHFFFAOYSA-N methylcyclopentane Chemical compound CC1CCCC1 GDOPTJXRTPNYNR-UHFFFAOYSA-N 0.000 description 4
- 150000003254 radicals Chemical class 0.000 description 4
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 description 4
- 150000003464 sulfur compounds Chemical class 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 description 4
- CWERGRDVMFNCDR-UHFFFAOYSA-N thioglycolic acid Chemical compound OC(=O)CS CWERGRDVMFNCDR-UHFFFAOYSA-N 0.000 description 4
- GETQZCLCWQTVFV-UHFFFAOYSA-N trimethylamine Chemical compound CN(C)C GETQZCLCWQTVFV-UHFFFAOYSA-N 0.000 description 4
- 239000011787 zinc oxide Substances 0.000 description 4
- 235000014692 zinc oxide Nutrition 0.000 description 4
- YKFLAYDHMOASIY-UHFFFAOYSA-N γ-terpinene Chemical compound CC(C)C1=CCC(C)=CC1 YKFLAYDHMOASIY-UHFFFAOYSA-N 0.000 description 4
- DCQBZYNUSLHVJC-UHFFFAOYSA-N 3-triethoxysilylpropane-1-thiol Chemical compound CCO[Si](OCC)(OCC)CCCS DCQBZYNUSLHVJC-UHFFFAOYSA-N 0.000 description 3
- UUEWCQRISZBELL-UHFFFAOYSA-N 3-trimethoxysilylpropane-1-thiol Chemical compound CO[Si](OC)(OC)CCCS UUEWCQRISZBELL-UHFFFAOYSA-N 0.000 description 3
- ZZMVLMVFYMGSMY-UHFFFAOYSA-N 4-n-(4-methylpentan-2-yl)-1-n-phenylbenzene-1,4-diamine Chemical compound C1=CC(NC(C)CC(C)C)=CC=C1NC1=CC=CC=C1 ZZMVLMVFYMGSMY-UHFFFAOYSA-N 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 3
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 3
- 229910021627 Tin(IV) chloride Inorganic materials 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 125000003277 amino group Chemical group 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000007720 emulsion polymerization reaction Methods 0.000 description 3
- 125000003700 epoxy group Chemical group 0.000 description 3
- 239000006232 furnace black Substances 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- 230000001771 impaired effect Effects 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 3
- 229910017604 nitric acid Inorganic materials 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 229910052700 potassium Inorganic materials 0.000 description 3
- 239000010734 process oil Substances 0.000 description 3
- 150000004053 quinones Chemical class 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- PXQLVRUNWNTZOS-UHFFFAOYSA-N sulfanyl Chemical class [SH] PXQLVRUNWNTZOS-UHFFFAOYSA-N 0.000 description 3
- 229920003051 synthetic elastomer Polymers 0.000 description 3
- 239000005061 synthetic rubber Substances 0.000 description 3
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 3
- HPGGPRDJHPYFRM-UHFFFAOYSA-J tin(iv) chloride Chemical compound Cl[Sn](Cl)(Cl)Cl HPGGPRDJHPYFRM-UHFFFAOYSA-J 0.000 description 3
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 description 2
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 description 2
- VBQCFYPTKHCPGI-UHFFFAOYSA-N 1,1-bis(2-methylpentan-2-ylperoxy)cyclohexane Chemical compound CCCC(C)(C)OOC1(OOC(C)(C)CCC)CCCCC1 VBQCFYPTKHCPGI-UHFFFAOYSA-N 0.000 description 2
- MYRTYDVEIRVNKP-UHFFFAOYSA-N 1,2-Divinylbenzene Chemical compound C=CC1=CC=CC=C1C=C MYRTYDVEIRVNKP-UHFFFAOYSA-N 0.000 description 2
- LZDKZFUFMNSQCJ-UHFFFAOYSA-N 1,2-diethoxyethane Chemical compound CCOCCOCC LZDKZFUFMNSQCJ-UHFFFAOYSA-N 0.000 description 2
- AZQWKYJCGOJGHM-UHFFFAOYSA-N 1,4-benzoquinone Chemical compound O=C1C=CC(=O)C=C1 AZQWKYJCGOJGHM-UHFFFAOYSA-N 0.000 description 2
- IANQTJSKSUMEQM-UHFFFAOYSA-N 1-benzofuran Chemical compound C1=CC=C2OC=CC2=C1 IANQTJSKSUMEQM-UHFFFAOYSA-N 0.000 description 2
- DURPTKYDGMDSBL-UHFFFAOYSA-N 1-butoxybutane Chemical compound CCCCOCCCC DURPTKYDGMDSBL-UHFFFAOYSA-N 0.000 description 2
- 238000001644 13C nuclear magnetic resonance spectroscopy Methods 0.000 description 2
- YBYIRNPNPLQARY-UHFFFAOYSA-N 1H-indene Chemical compound C1=CC=C2CC=CC2=C1 YBYIRNPNPLQARY-UHFFFAOYSA-N 0.000 description 2
- YAJYJWXEWKRTPO-UHFFFAOYSA-N 2,3,3,4,4,5-hexamethylhexane-2-thiol Chemical compound CC(C)C(C)(C)C(C)(C)C(C)(C)S YAJYJWXEWKRTPO-UHFFFAOYSA-N 0.000 description 2
- SDJHPPZKZZWAKF-UHFFFAOYSA-N 2,3-dimethylbuta-1,3-diene Chemical compound CC(=C)C(C)=C SDJHPPZKZZWAKF-UHFFFAOYSA-N 0.000 description 2
- VTFXHGBOGGGYDO-UHFFFAOYSA-N 2,4-bis(dodecylsulfanylmethyl)-6-methylphenol Chemical compound CCCCCCCCCCCCSCC1=CC(C)=C(O)C(CSCCCCCCCCCCCC)=C1 VTFXHGBOGGGYDO-UHFFFAOYSA-N 0.000 description 2
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 2
- RCJMVGJKROQDCB-UHFFFAOYSA-N 2-methylpenta-1,3-diene Chemical compound CC=CC(C)=C RCJMVGJKROQDCB-UHFFFAOYSA-N 0.000 description 2
- DVNPFNZTPMWRAX-UHFFFAOYSA-N 2-triethoxysilylethanethiol Chemical compound CCO[Si](CCS)(OCC)OCC DVNPFNZTPMWRAX-UHFFFAOYSA-N 0.000 description 2
- LOSLJXKHQKRRFN-UHFFFAOYSA-N 2-trimethoxysilylethanethiol Chemical compound CO[Si](OC)(OC)CCS LOSLJXKHQKRRFN-UHFFFAOYSA-N 0.000 description 2
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 description 2
- GQBHYWDCHSZDQU-UHFFFAOYSA-N 4-(2,4,4-trimethylpentan-2-yl)-n-[4-(2,4,4-trimethylpentan-2-yl)phenyl]aniline Chemical compound C1=CC(C(C)(C)CC(C)(C)C)=CC=C1NC1=CC=C(C(C)(C)CC(C)(C)C)C=C1 GQBHYWDCHSZDQU-UHFFFAOYSA-N 0.000 description 2
- JLBJTVDPSNHSKJ-UHFFFAOYSA-N 4-Methylstyrene Chemical compound CC1=CC=C(C=C)C=C1 JLBJTVDPSNHSKJ-UHFFFAOYSA-N 0.000 description 2
- VXEGSRKPIUDPQT-UHFFFAOYSA-N 4-[4-(4-methoxyphenyl)piperazin-1-yl]aniline Chemical compound C1=CC(OC)=CC=C1N1CCN(C=2C=CC(N)=CC=2)CC1 VXEGSRKPIUDPQT-UHFFFAOYSA-N 0.000 description 2
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 description 2
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- NLZUEZXRPGMBCV-UHFFFAOYSA-N Butylhydroxytoluene Chemical compound CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 NLZUEZXRPGMBCV-UHFFFAOYSA-N 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-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
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 2
- 239000005632 Capric acid (CAS 334-48-5) Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- BWLUMTFWVZZZND-UHFFFAOYSA-N Dibenzylamine Chemical compound C=1C=CC=CC=1CNCC1=CC=CC=C1 BWLUMTFWVZZZND-UHFFFAOYSA-N 0.000 description 2
- 229920001174 Diethylhydroxylamine Polymers 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical class S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 2
- 229920002943 EPDM rubber Polymers 0.000 description 2
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- AVXURJPOCDRRFD-UHFFFAOYSA-N Hydroxylamine Chemical compound ON AVXURJPOCDRRFD-UHFFFAOYSA-N 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- NHTMVDHEPJAVLT-UHFFFAOYSA-N Isooctane Chemical compound CC(C)CC(C)(C)C NHTMVDHEPJAVLT-UHFFFAOYSA-N 0.000 description 2
- 239000005639 Lauric acid Substances 0.000 description 2
- 239000002841 Lewis acid Substances 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- 241000254043 Melolonthinae Species 0.000 description 2
- 229910052779 Neodymium Inorganic materials 0.000 description 2
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Description
本発明は、上記の実情に鑑みてなされたものであり、ウェットグリップ性能、操縦安定性に優れた重荷重タイヤ用ゴム組成物、これを一部に用いたタイヤトレッド、及び重荷重タイヤを提供する。
〔1〕固形ゴム(A)100質量部に対して、下記式(1)で表されるシラン化合物に由来する官能基を有する変性液状ジエン系ゴム(B)を0.1~50質量部、及びフィラー(C)を20~200質量部含有する重荷重タイヤ用ゴム組成物であり、
前記変性液状ジエン系ゴム(B)が、下記(i)~(ii)
(i)重量平均分子量(Mw)が1,000以上120,000以下、
(ii)ビニル含有量が30モル%以上70モル%未満、
を満たす、重荷重タイヤ用ゴム組成物。
〔2〕前記変性液状ジエン系ゴム(B)の38℃における溶融粘度が0.1~4,000Pa・sである、〔1〕に記載の重荷重タイヤ用ゴム組成物。
〔3〕前記変性液状ジエン系ゴム(B)がイソプレン及び/又はブタジエンの単量体単位を含む重合体である、〔1〕又は〔2〕に記載の重荷重タイヤ用ゴム組成物。
〔4〕前記フィラー(C)が、シリカ及びカーボンブラックから選ばれる少なくとも1種である〔1〕~〔3〕のいずれかに記載の重荷重タイヤ用ゴム組成物。
〔5〕前記フィラー(C)が、平均粒径5~100nmのカーボンブラック及び平均粒径が0.5~200nmのシリカから選ばれる少なくとも1種である、〔4〕に記載の重荷重タイヤ用ゴム組成物。
〔6〕前記フィラー(C)がシリカであり、シリカ100質量部に対し、シランカップリング剤を0.1~30質量部含有する、〔4〕又は〔5〕に記載の重荷重タイヤ用ゴム組成物。
〔7〕前記固形ゴム(A)が、天然ゴム、スチレンブタジエンゴム、ブタジエンゴム及びイソプレンゴムから選ばれる1種以上である、〔1〕~〔6〕のいずれかに記載の重荷重タイヤ用ゴム組成物。
〔8〕前記固形ゴム(A)が天然ゴムを60質量%以上含有するものである、〔1〕~〔7〕のいずれかに記載の重荷重タイヤ用ゴム組成物。
〔9〕〔1〕~〔8〕のいずれかに記載の重荷重タイヤ用ゴム組成物を架橋させた架橋物。
〔10〕〔1〕~〔8〕のいずれかに記載の重荷重タイヤ用ゴム組成物を少なくとも一部に用いたタイヤトレッド。
〔11〕〔1〕~〔8〕のいずれかに記載の重荷重タイヤ用ゴム組成物を少なくとも一部に用いたビードフィラー。
〔12〕〔1〕~〔8〕のいずれかに記載の重荷重タイヤ用ゴム組成物を少なくとも一部に用いたタイヤ用ベルト。
〔13〕〔1〕~〔8〕のいずれかに記載の重荷重タイヤ用ゴム組成物を少なくとも一部に用いた重荷重タイヤ。
本発明の重荷重タイヤ用ゴム組成物で用いる固形ゴム(A)とは、20℃において固形状で取り扱うことができるゴムをいい、固形ゴム(A)の100℃におけるムーニー粘度ML1+4は通常20~200の範囲にあり、通常合成ゴム及び天然ゴムの少なくとも1種から選ばれるものである。
ラジカル重合開始剤としては、例えば、過硫酸アンモニウムや過硫酸カリウム等の過硫酸塩、有機過酸化物、過酸化水素等が挙げられる。
溶液重合スチレンブタジエンゴム(以下、S-SBRともいう。)は、通常の溶液重合法により製造でき、例えば、溶媒中でアニオン重合可能な活性金属を使用して、所望により極性化合物の存在下、スチレン及びブタジエンを重合する。
本発明の重荷重タイヤ用ゴム組成物で用いる変性液状ジエン系ゴム(B)とは、液状の重合体であり、重量平均分子量(Mw)が1,000以上120,000以下の範囲、ビニル含有量が30モル%以上70モル%未満であり、上述の式(1)で表されるシラン化合物に由来する官能基を有するものをいう。本発明の重荷重タイヤ用ゴム組成物において、変性液状ジエン系ゴム(B)が含まれることにより、ゴム組成物中のフィラー(C)の分散性に優れ、所望の物性の向上に理想的な状態となる。また、例えばタイヤトレッド等として用いた場合には、ウェットグリップ性能が向上し、操縦安定性も向上する。
ラジカル重合開始剤としては、例えば過硫酸アンモニウムや過硫酸カリウムのような過硫酸塩、有機過酸化物、過酸化水素等が挙げられる。
上記未変性の液状ジエン系ゴム(B’)の製造方法としては、上記方法の中でも、溶液
重合法が好ましい。
(一分子当たりの平均官能基数)=[(数平均分子量Mn)/(スチレン単位の分子量)×(共役ジエン及び必要に応じて含まれる共役ジエン以外の他の単量体単位の平均分子量)]/(官能基の当量)
この時に用いる好ましい老化防止剤としては、例えば、2,6-ジt-ブチル-4-メチルフェノール(BHT)、2,2’-メチレンビス(4-メチル-6-t-ブチルフェノール)、4,4’-チオビス(3-メチル-6-t-ブチルフェノール)、4,4’-ブチリデンビス(3-メチル-6-t-ブチルフェノール)(AO-40)、3,9-ビス[1,1-ジメチル-2-[3-(3-t-ブチル-4-ヒドロキシ-5-メチルフェニル)プロピオニルオキシ]エチル]-2,4,8,10-テトラオキサスピロ[5.5]ウンデカン(AO-80)、2,4-ビス[(オクチルチオ)メチル]-6-メチルフェノール(Irganox1520L)、2,4-ビス[(ドデシルチオ)メチル]-6-メチルフェノール(Irganox1726)、2-[1-(2-ヒドロキシ-3,5-ジt-ペンチルフェニル)エチル]-4,6-ジt-ペンチルフェニルアクリレート(SumilizerGS)、2-t-ブチル-6-(3-t-ブチル-2-ヒドロキシ-5-メチルベンジル)-4-メチルフェニルアクリレート(SumilizerGM)、6-t-ブチル-4-[3-(2,4,8,10-テトラ-t-ブチルジベンゾ[d,f][1,3,2]ジオキサホスフェピン-6-イルオキシ)プロピル]-2-メチルフェノール(SumilizerGP)、亜りん酸トリス(2,4-ジt-ブチルフェニル)(Irgafos168)、ジオクタデシル3,3’-ジチオビスプロピオネート、ヒドロキノン、p-メトキシフェノール、N-フェニル-N’-(1,3-ジメチルブチル)-p-フェニレンジアミン(ノクラック6C)、ビス(2,2,6,6-テトラメチル-4-ピペリジル)セバケート(LA-77Y)、N,N-ジオクタデシルヒドロキシルアミン(Irgastab FS 042)、ビス(4-t-オクチルフェニル)アミン(Irganox5057)などが挙げられる。上記老化防止剤は、1種単独で用いてもよく、2種以上を併用してもよい。
この変性液状ジエン系ゴム(B)において、官能基が導入される位置については重合末端であってもよく、重合体鎖の側鎖であってもよいが、複数の官能基を容易に導入できるという観点で、重合鎖の側鎖であることが好ましい。また上記官能基は1種単独で含まれていてもよく2種以上含まれていてもよい。したがって、変性液状ジエン系ゴム(B)は、変性化合物1種により変性されたものであってもよく、また2種以上の変性化合物で変性されていてもよい。
変性液状ジエン系ゴム(B)の分子量分布(Mw/Mn)は1.0~20.0が好ましく、1.0~15.0がより好ましく、1.0~10.0がさらに好ましい。Mw/Mnが前記範囲内であると、得られる変性液状ジエン系ゴム(B)の粘度のばらつきが小さく、より好ましい。なお、分子量分布(Mw/Mn)は、GPCの測定により求めた標準ポリスチレン換算の重量平均分子量(Mw)/数平均分子量(Mn)の比を意味する。
上記変性液状ジエン系ゴム(B)は、その製造に用いる重合触媒に由来する触媒残渣量が、金属換算で0~200ppmの範囲にあることが好ましい。例えば、変性液状ジエン系ゴム(B)の原料となる未変性の液状ジエン系ゴム(B’)を製造するための重合触媒として有機リチウム化合物等の有機アルカリ金属を用いた場合には、触媒残渣量の基準となる金属は、リチウム等のアルカリ金属になる。触媒残渣量が上記範囲にあることにより、加工等する際にタックが低下せず、また本発明のゴム組成物から得られる架橋物の耐熱性、タイヤの転がり抵抗性能が向上する。変性液状ジエン系ゴム(B)の製造に用いる重合触媒に由来する触媒残渣量としては、金属換算で、より好ましくは0~150ppm、さらに好ましくは0~100ppmである。なお、触媒残渣量は、例えば偏光ゼーマン原子吸光分光光度計を用いることにより測定できる。
本発明の重荷重タイヤ用ゴム組成物で用いるフィラー(C)としては、重荷重タイヤ用ゴム組成物に一般的に用いるものであれば特に制限はなく、機械強度の向上等の物性の改善、重荷重タイヤ用ゴム組成物を一部に用いたタイヤのドライグリップ性能、ウェットグリップ性能、及び低燃費性能を向上させるなどの観点からは、上記フィラー(C)の中でも、カーボンブラック及びシリカから選ばれる少なくとも1種が好ましい。
本発明においては、重荷重タイヤ用ゴム組成物を一部に用いたタイヤの機械強度を向上させること、及びフィラーを増量剤として配合することによる製造コストの改善等を目的として、シリカ及びカーボンブラック以外のフィラーを含有していてもよい。
本発明の重荷重タイヤ用ゴム組成物では、フィラー(C)としてシリカなどを含有する場合は、シランカップリング剤を含有することが好ましい一態様である。シランカップリング剤としては、例えば、スルフィド系化合物、メルカプト系化合物、ビニル系化合物、アミノ系化合物、グリシドキシ系化合物、ニトロ系化合物、クロロ系化合物等が挙げられる。
アミノ系化合物としては、例えば、3-アミノプロピルトリエトキシシラン、3-アミノプロピルトリメトキシシラン、3-(2-アミノエチル)アミノプロピルトリエトキシシラン、3-(2-アミノエチル)アミノプロピルトリメトキシシランなどが挙げられる。
クロロ系化合物としては、例えば、3-クロロプロピルトリメトキシシラン、3-クロロプロピルトリエトキシシラン、2-クロロエチルトリメトキシシラン、2-クロロエチルトリエトキシシランなどが挙げられる。
老化防止剤としては、例えば、アミン-ケトン系化合物、イミダゾール系化合物、アミン系化合物、フェノール系化合物、硫黄系化合物及びリン系化合物等が挙げられる。これら添加剤は、1種単独で用いられてもよく、2種以上を併用してもよい。
本発明の重荷重タイヤ用ゴム組成物の製造方法は、上記各成分を均一に混合できれば特に限定されない。重荷重タイヤ用ゴム組成物の製造に用いる装置としては、例えば、ニーダールーダー、ブラベンダー、バンバリーミキサー、インターナルミキサー等の接線式又は噛合式の密閉式混練機、単軸押出機、二軸押出機、ミキシングロール、及びローラーなどが挙げられる。上記ゴム組成物を製造は、通常70~270℃の温度範囲で行うことができる。
なお、上記抽出率は、架橋物2gをトルエン400mL中に浸漬し、23℃で48時間後にトルエン中に抽出された変性液状ジエン系ゴム(B)の量から算出することができる。
本発明のタイヤトレッドは、前記重荷重タイヤ用ゴム組成物を少なくとも一部に用いたものであり、優れたウェットグリップ性能及び操縦安定性を示すものである。本発明のタイヤトレッドの構造は特に制限されず、一層構造であっても多層構造であってもよいが、多層構造とする場合は、路面と接触する層に前記重荷重タイヤ用ゴム組成物を用いることが好ましい。
本実施例及び比較例において使用した各成分は以下のとおりである。
〈固形ゴム(A)〉
天然ゴム :STR20(タイ産天然ゴム)
ブタジエンゴム:BR01(JSR株式会社製、Mw:55万、シス体含有量95質量%)
〈変性液状ジエン系ゴム(B)〉
後述の製造例1で得られた変性液状ポリブタジエン及び製造例2で得られた液状ジエン系ゴム
〈フィラー(C)〉
シリカ :ULTRASIL7000GR(エボニック デグサ ジャパン製、湿式シリカ、平均粒径14nm)
カーボンブラック:ダイアブラックI(三菱化学株式会社製、平均粒径20nm)
〈加硫剤(D)〉
硫黄(微粉硫黄200メッシュ、鶴見化学工業株式会社製)
〈加硫促進剤(E)〉
加硫促進剤(1):ノクセラーCZ-G(大内新興化学工業株式会社製)
加硫促進剤(2):ノクセラーD (大内新興化学工業株式会社製)
〈加硫助剤(F)〉
ステアリン酸 :ルナックS-20(花王株式会社製)
亜鉛華 :酸化亜鉛(堺化学工業株式会社製)
〈任意成分〉
TDAE :VivaTec500(H&R社製)
シランカップリング剤:Si-75(エボニック デグサ ジャパン製)
老化防止剤(1) :アンテージRD(川口化学工業株式会社)
老化防止剤(2) :ノクラック6C(大内新興化学工業株式会社製)
十分に乾燥した5Lオートクレーブを窒素置換し、ヘキサン1150g及びn-ブチルリチウム(17質量%ヘキサン溶液)154gを仕込み、50℃に昇温した後、撹拌条件下、重合温度を50℃となるように制御しながら、N,N,N’,N’-テトラメチルエチレンジアミン10gと、ブタジエン1250gを逐次添加して、1時間重合した。その後メタノールを添加して重合反応を停止させ、重合体溶液を得た。得られた重合体溶液に水を添加して撹拌し、水で重合体溶液を洗浄した。撹拌を終了し、重合体溶液相と水相とが分離していることを確認した後、水を分離した。洗浄終了後の重合体溶液を70℃で24時間真空乾燥することにより、未変性液状ジエン系ゴム(B’-1)を得た。
十分に乾燥した5Lオートクレーブを窒素置換し、ヘキサン1150g及びn-ブチルリチウム(17質量%ヘキサン溶液)154gを仕込み、50℃に昇温した後、撹拌条件下、重合温度を50℃となるように制御しながら、N,N,N’,N’-テトラメチルエチレンジアミン10gと、ブタジエン1250gを逐次添加して、1時間重合した。その後メタノールを添加して重合反応を停止させ、重合体溶液を得た。得られた重合体溶液に水を添加して撹拌し、水で重合体溶液を洗浄した。撹拌を終了し、重合体溶液相と水相とが分離していることを確認した後、水を分離した。洗浄終了後の重合体溶液を70℃で24時間真空乾燥することにより、液状ジエン系ゴム(B’-2)を得た。
なお、製造例で得られた変性液状ジエン系ゴム等の各物性の測定方法及び算出方法は以下の通りである。
変性液状ジエン系ゴム(B)のMwは、GPC(ゲルパーミエーションクロマトグラフィー)により標準ポリスチレン換算分子量で求めた。測定装置及び条件は、以下の通りである。
・装置 :東ソー株式会社製GPC装置「GPC8020」
・分離カラム :東ソー株式会社製「TSKgelG4000HXL」
・検出器 :東ソー株式会社製「RI-8020」
・溶離液 :テトラヒドロフラン
・溶離液流量 :1.0mL/分
・サンプル濃度:5mg/10mL
・カラム温度 :40℃
変性液状ジエン系ゴム(B)のビニル含有量を、日本電子株式会社製1H-NMR(500MHz)を使用し、サンプル/重クロロホルム=50mg/1mLの濃度、積算回数1024回で測定した。得られたスペクトルのビニル化されたジエン化合物由来の二重結合のピークと、ビニル化されていないジエン化合物由来の二重結合のピークとの面積比から、ビニル含有量を算出した。
変性液状ジエン系ゴム(B)10mgをアルミパンに採取し、示差走査熱量測定(DSC)により10℃/分の昇温速度条件においてサーモグラムを測定し、DDSCのピークトップの値をガラス転移温度(Tg)とした。
変性液状ジエン系ゴム(B)の38℃における溶融粘度をブルックフィールド型粘度計(BROOKFIELD ENGINEERING LABS.INC.製)により測定した。
変性液状ジエン系ゴム(B)一分子当たりの平均官能基数は、変性液状ジエン系ゴム(B)の官能基の当量(g/eq)とスチレン換算の数平均分子量Mnより求めることができる。
(一分子当たりの平均官能基数)=[(数平均分子量Mn)/(スチレン単位の分子量)×(共役ジエン及び必要に応じて含まれる共役ジエン以外の他の単量体単位の平均分子量)]/(官能基の当量)
以下、製造例1で得られた変性液状ジエン系ゴム(B-1)及び製造例2で得られた液状ジエン系ゴム(B’-2)の物性を表1にまとめる。
表2に記載した配合割合(質量部)にしたがって、固形ゴム(A)、変性液状ジエン系ゴム(B)、フィラー(C)、TDAE、シランカップリング剤、亜鉛華、ステアリン酸、及び老化防止剤を、それぞれ密閉式バンバリーミキサーに投入して開始温度60℃、樹脂温度が150℃となるように6分間混練した後、ミキサー外に取り出して室温まで冷却した。次いで、この混合物を再度バンバリーミキサーに入れ、加硫剤(硫黄)及び加硫促進剤を加えて100℃で75秒混練することでゴム組成物を得た。
なお、各評価の測定方法は以下のとおりである。
実施例及び比較例で作製したゴム組成物のシートから縦40mm×横5mmの試験片を切り出し、GABO社製動的粘弾性測定装置を用いて、測定温度60℃、周波数10Hz、静的歪み10%、動的歪み2%の条件で、tanδを測定し、転がり抵抗性能の指標とした。各実施例及び比較例の数値は、表2の比較例1の値を100とした際の相対値である。なお、数値が小さいほどゴム組成物の転がり抵抗性能が良好である。
実施例及び比較例で作製したゴム組成物のシートから縦40mm×横5mmの試験片を切り出し、GABO社製動的粘弾性測定装置を用いて、測定温度0℃、周波数10Hz、静的歪み10%、動的歪み2%の条件で、tanδを測定し、ウェットグリップ性能の指標とした。各実施例及び比較例の数値は、表2の比較例1の値を100とした際の相対値である。なお、数値が大きいほどゴム組成物のウェットグリップ性能が良好である。
実施例及び比較例で作製したゴム組成物のシートから縦40mm×横5mmの試験片を切り出し、GABO社製動的粘弾性測定装置を用いて、測定温度25℃または70℃、周波数10Hz、静的歪み10%、動的歪み2%の条件で、E’を測定し、操縦安定性の指標とした。各実施例及び比較例の数値は、表2の比較例1の値をそれぞれ100とした際の相対値である。なお、数値が大きいほどタイヤに用いた際の操縦安定性が良好である。
実施例及び比較例で作製したゴム組成物のシートから縦40mm×横5mmの試験片を切り出し、JIS K6253に準拠して、タイプA硬度計により硬度を測定した。各実施例及び比較例の数値は、表2の比較例1の値を100とした際の相対値である。なお、数値が大きいほどゴム組成物の硬度が大きく良好である。
Claims (13)
- 固形ゴム(A)100質量部に対して、下記式(1)で表されるシラン化合物に由来する官能基を有する変性液状ジエン系ゴム(B)を0.1~30質量部、及びフィラー(C)を20~200質量部含有する重荷重タイヤ用ゴム組成物であり、
前記変性液状ジエン系ゴム(B)が、下記(i)~(ii)
(i)重量平均分子量(Mw)が1,000以上15,000未満、
(ii)ビニル含有量が30モル%以上70モル%未満、
を満たし、前記変性液状ジエン系ゴム(B)が、官能基で変性されていない未変性の液状ジエン系ゴム(B')にラジカル発生剤を加えて、加熱する方法により下記式(1)で表されるシラン化合物を付加して得られた物である、重荷重タイヤ用ゴム組成物。
- 前記変性液状ジエン系ゴム(B)の38℃における溶融粘度が0.1~4,000Pa・sである、請求項1に記載の重荷重タイヤ用ゴム組成物。
- 前記変性液状ジエン系ゴム(B)がイソプレン及び/又はブタジエンの単量体単位を含む重合体である、請求項1又は2に記載の重荷重タイヤ用ゴム組成物。
- 前記フィラー(C)が、シリカ及びカーボンブラックから選ばれる少なくとも1種である、請求項1~3のいずれかに記載の重荷重タイヤ用ゴム組成物。
- 前記フィラー(C)が、平均粒径5~100nmのカーボンブラック及び平均粒径が0.5~200nmのシリカから選ばれる少なくとも1種である、請求項4に記載の重荷重タイヤ用ゴム組成物。
- 前記フィラー(C)がシリカであり、シリカ100質量部に対し、シランカップリング剤を0.1~30質量部含有する、請求項4又は5に記載の重荷重タイヤ用ゴム組成物。
- 前記固形ゴム(A)が、天然ゴム、スチレンブタジエンゴム、ブタジエンゴム及びイソプレンゴムから選ばれる1種以上である、請求項1~6のいずれか1項に記載の重荷重タイヤ用ゴム組成物。
- 前記固形ゴム(A)が天然ゴムを60質量%以上含有するものである、請求項1~7のいずれか1項に記載の重荷重タイヤ用ゴム組成物。
- 請求項1~8のいずれか1項に記載の重荷重タイヤ用ゴム組成物を架橋させた架橋物。
- 請求項1~8のいずれか1項に記載の重荷重タイヤ用ゴム組成物を少なくとも一部に用いたタイヤトレッド。
- 請求項1~8のいずれか1項に記載の重荷重タイヤ用ゴム組成物を少なくとも一部に用いたビードフィラー。
- 請求項1~8のいずれか1項に記載の重荷重タイヤ用ゴム組成物を少なくとも一部に用いたタイヤ用ベルト。
- 請求項1~8のいずれか1項に記載の重荷重タイヤ用ゴム組成物を少なくとも一部に用いた重荷重タイヤ。
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US20240043587A1 (en) * | 2022-07-28 | 2024-02-08 | The Goodyear Tire & Rubber Company | Rubber composition and truck tire |
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