JP2006152214A - タイヤ用トレッドゴム組成物及び空気入りタイヤ - Google Patents
タイヤ用トレッドゴム組成物及び空気入りタイヤ Download PDFInfo
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- JP2006152214A JP2006152214A JP2004348784A JP2004348784A JP2006152214A JP 2006152214 A JP2006152214 A JP 2006152214A JP 2004348784 A JP2004348784 A JP 2004348784A JP 2004348784 A JP2004348784 A JP 2004348784A JP 2006152214 A JP2006152214 A JP 2006152214A
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- rubber composition
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- tread rubber
- tire
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- 229920001971 elastomer Polymers 0.000 title claims abstract description 107
- 239000005060 rubber Substances 0.000 title claims abstract description 107
- 239000000203 mixture Substances 0.000 title claims abstract description 69
- 239000000178 monomer Substances 0.000 claims abstract description 48
- 229920003048 styrene butadiene rubber Polymers 0.000 claims abstract description 45
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical class C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 claims abstract description 36
- 244000043261 Hevea brasiliensis Species 0.000 claims abstract description 32
- 229920003052 natural elastomer Polymers 0.000 claims abstract description 32
- 229920001194 natural rubber Polymers 0.000 claims abstract description 32
- 229920006173 natural rubber latex Polymers 0.000 claims abstract description 17
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 67
- 239000006229 carbon black Substances 0.000 claims description 34
- 239000000377 silicon dioxide Substances 0.000 claims description 31
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 16
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 15
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 11
- 125000000623 heterocyclic group Chemical group 0.000 claims description 8
- 238000010559 graft polymerization reaction Methods 0.000 claims description 7
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 7
- 125000003277 amino group Chemical group 0.000 claims description 6
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 5
- 239000006237 Intermediate SAF Substances 0.000 claims description 4
- 125000005370 alkoxysilyl group Chemical group 0.000 claims description 4
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 claims description 4
- 125000003700 epoxy group Chemical group 0.000 claims description 4
- 125000002560 nitrile group Chemical group 0.000 claims description 4
- 125000003368 amide group Chemical group 0.000 claims description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-O ammonium group Chemical group [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 125000000751 azo group Chemical group [*]N=N[*] 0.000 claims description 3
- 125000000664 diazo group Chemical group [N-]=[N+]=[*] 0.000 claims description 3
- 125000002228 disulfide group Chemical group 0.000 claims description 3
- 125000005462 imide group Chemical group 0.000 claims description 3
- 125000001841 imino group Chemical group [H]N=* 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 125000000475 sulfinyl group Chemical group [*:2]S([*:1])=O 0.000 claims description 3
- 125000000472 sulfonyl group Chemical group *S(*)(=O)=O 0.000 claims description 3
- 125000002813 thiocarbonyl group Chemical group *C(*)=S 0.000 claims description 3
- 125000000101 thioether group Chemical group 0.000 claims description 3
- 125000001820 oxy group Chemical group [*:1]O[*:2] 0.000 claims 1
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- 230000001112 coagulating effect Effects 0.000 abstract description 2
- 230000002542 deteriorative effect Effects 0.000 abstract 1
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- -1 hydrazo groups Chemical group 0.000 description 58
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 30
- 239000000306 component Substances 0.000 description 27
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 25
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 23
- 238000006116 polymerization reaction Methods 0.000 description 23
- 229910052718 tin Inorganic materials 0.000 description 15
- 229910052744 lithium Inorganic materials 0.000 description 14
- 150000002642 lithium compounds Chemical class 0.000 description 12
- 229910052757 nitrogen Inorganic materials 0.000 description 11
- 239000003505 polymerization initiator Substances 0.000 description 11
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 10
- 238000002156 mixing Methods 0.000 description 10
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 9
- 229920000126 latex Polymers 0.000 description 9
- 239000004816 latex Substances 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 9
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- MZRVEZGGRBJDDB-UHFFFAOYSA-N N-Butyllithium Chemical compound [Li]CCCC MZRVEZGGRBJDDB-UHFFFAOYSA-N 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 8
- 239000003795 chemical substances by application Substances 0.000 description 7
- 239000000945 filler Substances 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 6
- 229920005601 base polymer Polymers 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- CIHOLLKRGTVIJN-UHFFFAOYSA-N tert‐butyl hydroperoxide Chemical compound CC(C)(C)OO CIHOLLKRGTVIJN-UHFFFAOYSA-N 0.000 description 6
- KFDVPJUYSDEJTH-UHFFFAOYSA-N 4-ethenylpyridine Chemical compound C=CC1=CC=NC=C1 KFDVPJUYSDEJTH-UHFFFAOYSA-N 0.000 description 5
- 150000001252 acrylic acid derivatives Chemical class 0.000 description 5
- 238000013329 compounding Methods 0.000 description 5
- 239000003999 initiator Substances 0.000 description 5
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 5
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 4
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 4
- 150000001408 amides Chemical class 0.000 description 4
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 229920001577 copolymer Polymers 0.000 description 4
- 239000003995 emulsifying agent Substances 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 4
- 238000004073 vulcanization Methods 0.000 description 4
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 3
- 125000000954 2-hydroxyethyl group Chemical group [H]C([*])([H])C([H])([H])O[H] 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 229910021627 Tin(IV) chloride Inorganic materials 0.000 description 3
- 150000001339 alkali metal compounds Chemical class 0.000 description 3
- 238000010539 anionic addition polymerization reaction Methods 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 150000001735 carboxylic acids Chemical class 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000007720 emulsion polymerization reaction Methods 0.000 description 3
- 150000002148 esters Chemical class 0.000 description 3
- 125000001183 hydrocarbyl group Chemical group 0.000 description 3
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 description 3
- 230000000977 initiatory effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000007717 redox polymerization reaction Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 125000001302 tertiary amino group Chemical group 0.000 description 3
- FAGUFWYHJQFNRV-UHFFFAOYSA-N tetraethylenepentamine Chemical compound NCCNCCNCCNCCN FAGUFWYHJQFNRV-UHFFFAOYSA-N 0.000 description 3
- 150000003606 tin compounds Chemical class 0.000 description 3
- HPGGPRDJHPYFRM-UHFFFAOYSA-J tin(iv) chloride Chemical compound Cl[Sn](Cl)(Cl)Cl HPGGPRDJHPYFRM-UHFFFAOYSA-J 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- AECRHRJZBOEQCN-UHFFFAOYSA-N 2-(3-chlorobuta-1,3-dienyl)-n-phenylaniline Chemical compound ClC(=C)C=CC1=CC=CC=C1NC1=CC=CC=C1 AECRHRJZBOEQCN-UHFFFAOYSA-N 0.000 description 2
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 description 2
- JESXATFQYMPTNL-UHFFFAOYSA-N 2-ethenylphenol Chemical compound OC1=CC=CC=C1C=C JESXATFQYMPTNL-UHFFFAOYSA-N 0.000 description 2
- KGIGUEBEKRSTEW-UHFFFAOYSA-N 2-vinylpyridine Chemical compound C=CC1=CC=CC=N1 KGIGUEBEKRSTEW-UHFFFAOYSA-N 0.000 description 2
- KDCGOANMDULRCW-UHFFFAOYSA-N 7H-purine Chemical compound N1=CNC2=NC=NC2=C1 KDCGOANMDULRCW-UHFFFAOYSA-N 0.000 description 2
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-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
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 2
- SJIXRGNQPBQWMK-UHFFFAOYSA-N DEAEMA Natural products CCN(CC)CCOC(=O)C(C)=C SJIXRGNQPBQWMK-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- SIKJAQJRHWYJAI-UHFFFAOYSA-N Indole Chemical compound C1=CC=C2NC=CC2=C1 SIKJAQJRHWYJAI-UHFFFAOYSA-N 0.000 description 2
- PCNDJXKNXGMECE-UHFFFAOYSA-N Phenazine Natural products C1=CC=CC2=NC3=CC=CC=C3N=C21 PCNDJXKNXGMECE-UHFFFAOYSA-N 0.000 description 2
- 239000005062 Polybutadiene Substances 0.000 description 2
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 2
- KYQCOXFCLRTKLS-UHFFFAOYSA-N Pyrazine Chemical compound C1=CN=CC=N1 KYQCOXFCLRTKLS-UHFFFAOYSA-N 0.000 description 2
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 2
- KAESVJOAVNADME-UHFFFAOYSA-N Pyrrole Chemical compound C=1C=CNC=1 KAESVJOAVNADME-UHFFFAOYSA-N 0.000 description 2
- SMWDFEZZVXVKRB-UHFFFAOYSA-N Quinoline Chemical compound N1=CC=CC2=CC=CC=C21 SMWDFEZZVXVKRB-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- XXROGKLTLUQVRX-UHFFFAOYSA-N allyl alcohol Chemical compound OCC=C XXROGKLTLUQVRX-UHFFFAOYSA-N 0.000 description 2
- 230000003712 anti-aging effect Effects 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 229920005549 butyl rubber Polymers 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 150000001993 dienes Chemical class 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000010528 free radical solution polymerization reaction Methods 0.000 description 2
- 239000001530 fumaric acid Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229920001519 homopolymer Polymers 0.000 description 2
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 2
- 125000002768 hydroxyalkyl group Chemical group 0.000 description 2
- UIDWHMKSOZZDAV-UHFFFAOYSA-N lithium tin Chemical compound [Li].[Sn] UIDWHMKSOZZDAV-UHFFFAOYSA-N 0.000 description 2
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 2
- 239000011976 maleic acid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
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- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 2
- SBRDEWUKACUNPY-UHFFFAOYSA-N n-(2-phenylethenyl)aniline Chemical compound C=1C=CC=CC=1NC=CC1=CC=CC=C1 SBRDEWUKACUNPY-UHFFFAOYSA-N 0.000 description 2
- 125000004433 nitrogen atom Chemical group N* 0.000 description 2
- 125000005740 oxycarbonyl group Chemical group [*:1]OC([*:2])=O 0.000 description 2
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- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 2
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- 125000004076 pyridyl group Chemical group 0.000 description 2
- 125000000467 secondary amino group Chemical group [H]N([*:1])[*:2] 0.000 description 2
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
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- GOXLWLAZOXPXEJ-UHFFFAOYSA-N (3-ethenylphenyl)methyl-trioctylstannane Chemical compound CCCCCCCC[Sn](CCCCCCCC)(CCCCCCCC)CC1=CC=CC(C=C)=C1 GOXLWLAZOXPXEJ-UHFFFAOYSA-N 0.000 description 1
- WSVNZFOPDYMQOQ-UHFFFAOYSA-N (3-ethenylphenyl)methyl-triphenylstannane Chemical compound C=CC1=CC=CC(C[Sn](C=2C=CC=CC=2)(C=2C=CC=CC=2)C=2C=CC=CC=2)=C1 WSVNZFOPDYMQOQ-UHFFFAOYSA-N 0.000 description 1
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- OWRCNXZUPFZXOS-UHFFFAOYSA-N 1,3-diphenylguanidine Chemical compound C=1C=CC=CC=1NC(=N)NC1=CC=CC=C1 OWRCNXZUPFZXOS-UHFFFAOYSA-N 0.000 description 1
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- 125000000022 2-aminoethyl group Chemical group [H]C([*])([H])C([H])([H])N([H])[H] 0.000 description 1
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Abstract
【解決手段】天然ゴムラテックスに極性基含有単量体をグラフト重合し、凝固、乾燥してなる変性天然ゴムと変性スチレン−ブタジエンゴムとを含むタイヤ用トレッドゴム組成物。このタイヤ用トレッドゴム組成物をトレッドゴムに用いた空気入りタイヤ。
Description
まず、本発明のタイヤ用トレッドゴム組成物に含まれる変性天然ゴムについて説明する。
(1)アニリノスチレン、β−フェニル−p−アニリノスチレン、β−シアノ−p−アニリノスチレン、β−シアノ−β−メチル−p−アニリノスチレン、β−クロロ−p−アニリノスチレン、β−カルボキシ−p−アニリノスチレン、β−メトキシカルボニル−p−アニリノスチレン、β−(2−ヒドロキシエトキシ)カルボニル−p−アニリノスチレン、β−ホルミル−p−アニリノスチレン、β−ホルミル−β−メチル−p−アニリノスチレン、α−カルボキシ−β−カルボキシ−β−フェニル−p−アニリノスチレン等のようなアニリノスチレン類
(2)アニリノフェニルブタジエン、1−アニリノフェニル−1,3−ブタジエン、1−アニリノフェニル−3−メチル−1,3−ブタジエン、1−アニリノフェニル−3−クロロ−1,3−ブタジエン、3−アニリノフェニル−2−メチル−1,3−ブタジエン、1−アニリノフェニル−2−クロロ−1,3−ブタジエン、2−アニリノフェニル−1,3−ブタジエン、2−アニリノフェニル−3−メチル−1,3−ブタジエン、2−アニリノフェニル−3−クロロ−1,3−ブタジエン等のアニリノフェニルブタジエン類
(3)N−メチル(メタ)アクリルアミド、N−エチル(メタ)アクリルアミド、N−メチロールアクリルアミド、N−(4−アニリノフェニル)メタクリルアミド等のN−モノ置換(メタ)アクリルアミド類
等が挙げられる。
次に本発明のタイヤ用トレッドゴム組成物に含まれる変性スチレン−ブタジエンゴムについて説明する。
本発明に係るゴム組成物のゴム成分は、その100重量部中に前記変性天然ゴムを10〜90重量部、変性スチレン−ブタジエンゴムを90〜10重量部、特に変性天然ゴムを35〜65重量部、変性スチレン−ブタジエンゴムを65〜35重量部含むことが好ましい。この配合よりも変性天然ゴムの含有量多く、変性スチレン−ブタジエンゴムが少ないと、この変性天然ゴムを配合したことによるカーボンブラックの分散性改良効果を十分に得ることができず、変性天然ゴムが少なく、変性スチレン−ブタジエンゴムが多いと耐破壊性が悪くなる。
次に本発明のタイヤ用トレッドゴム組成物に配合されるフィラーについて説明する。
本発明においては、ゴム組成物中に更にシランカップリング剤を含むことが好ましい。
本発明のタイヤ用トレッドゴム組成物には、上述のゴム成分、カーボンブラック、シリカ、シランカップリング剤の他、加硫剤、加硫促進剤、老化防止剤、軟化剤、酸化亜鉛、ステアリン酸等のゴム業界で通常使用される配合剤を、本発明の目的を害しない範囲内で適宜選択し配合することができる。これら配合剤は、市販品を好適に使用することができる。なお、上記ゴム組成物は、ゴム成分に、カーボンブラック及びシリカ等と共に、必要に応じて適宜選択した各種配合剤を配合して、混練り、熱入れ、押出等することにより製造することができる。
本発明の空気入りタイヤは、上述の本発明のタイヤ用トレッドゴム組成物をトレッドゴムに用いたことを特徴とする。ここで、トレッドが所謂キャップ/ベース構造の場合、キャップゴム及びベースゴムのいずれに上記ゴム組成物を用いてもよい。
(1)天然ゴムラテックスの変性反応工程
フィールドラテックスをラテックスセパレーター(斎藤遠心工業製)を用いて回転数7500rpmで遠心分離して乾燥ゴム濃度60%の濃縮ラテックスを得た。この濃縮ラテックス1000gを、撹拌機、温調ジャケットを備えたステンレス製反応容器に投入し、予め10mlの水と90mgの乳化剤(エマルゲン1108,花王株式会社製)を4−ビニルピリジン3.0gに加えて乳化したものを990mlの水とともに添加し、これらを窒素置換しながら30分間撹拌した。次いで、重合開始剤としてtert−ブチルヒドロパーオキサイド1.2gとテトラエチレンペンタミン1.2gとを添加し、40℃で30分間反応させることにより、変性天然ゴムラテックスを得た。
次いで、ギ酸を添加してpHを4.7に調整することにより、変性天然ゴムラテックスを凝固させた。このようにして得た固形物をクレーパーで5回処理し、シュレッダーに通してクラム化し、熱風式乾燥機により110℃で210分間乾燥して変性天然ゴムAを得た。このようにして得た変性天然ゴムAの重量から極性基含有単量体としての4−ビニルピリジンの転化率は100%であることが確認された。また、該変性天然ゴムを石油エーテルで抽出し、さらにアセトンとメタノールの2:1混合溶媒で抽出することによりホモポリマーの分離を行ったところ、抽出物の分析からホモポリマーは検出されず、添加した単量体の100%が天然ゴム分子に導入されていることを確認した。
乾燥し、窒素置換された800mlの耐圧ガラス容器に、シクロヘキサン300g、1,3−ブタジエン単量体37.5g、スチレン単量体12.5g、カリウム−t−アミレート0.03mmol、THF2mmolを注入し、さらに二級アミンとしてヘキサメチレンイミン0.41mmolを加えた。これにn−ブチルリチウム(BuLi)0.45mmolを加えた後、50℃で2.5時間重合を行った。重合系は重合開始から終了まで、全く沈澱は見られず均一で透明であった。重合転化率はほぼ100%であった。
表1に示す配合のゴム組成物について、下記の評価を行い、結果を表1に示した。
また、評価結果はいずれも比較例1の場合を100として相対値で示した。
[使用材料]
天然ゴム:RSS3
変性天然ゴム:製造例1で製造した4−ビニルピリジン0.5%変性天然ゴム
スチレン−ブタジエンゴム:JSR1500
変性スチレン−ブタジエンゴム:製造例2で製造したスズ変性スチレン−ブタジエンゴム
カーボンブラック:N234東海カーボン社製「シースト7HM」
シリカ:東ソーシリカ社製「ニプシルAQ」
シランカップリング剤:信越化学社製「ABC856」
老化防止剤:住友化学社製「アンチゲン6C」
加硫促進剤DPG:ジフェニルグアニジン
加硫促進剤CZ:N−シクロヘキシルベンゾチアジルスルフェンアミド
加硫促進剤DM:ジベンゾチアジルスルフィド
(1)RR(転がり抵抗)及びWET(WETグリップ性能)
上島製作所 スペクトロメーター
測定 Tanδ
温度 60℃(RR) 0℃(WET)
歪み 1%
周波数 52Hz
値はINDEX 大が良
(2)耐破壊性
切断時の強力(Tb)をJIS K6301−1995に従って測定した。
Claims (16)
- 天然ゴムラテックスに極性基含有単量体をグラフト重合し、凝固、乾燥してなる変性天然ゴムと変性スチレン−ブタジエンゴムとを含むことを特徴とするタイヤ用トレッドゴム組成物。
- 請求項1において、前記極性基が、アミノ基、イミノ基、ニトリル基、アンモニウム基、イミド基、アミド基、ヒドラゾ基、アゾ基、ジアゾ基、ヒドロキシル基、カルボキシル基、カルボニル基、エポキシ基、オキシカルボニル基、スルフィド基、ジスルフィド基、スルホニル基、スルフィニル基、チオカルボニル基、含窒素複素環基、含酸素複素環基、アルコキシシリル基及びスズ含有基から選ばれる1種又は2種以上であることを特徴とするタイヤ用トレッドゴム組成物。
- 請求項1又は2において、前記極性基含有単量体のグラフト量が天然ゴムラテックスのゴム分に対し0.01〜5.0重量%であることを特徴とするタイヤ用トレッドゴム組成物。
- 請求項1ないし3のいずれか1項において、カーボンブラックを含むことを特徴とするタイヤ用トレッドゴム組成物。
- 請求項4において、シリカを含むことを特徴とするタイヤ用トレッドゴム組成物。
- 請求項1ないし5のいずれか1項において、シランカップリング剤を含むことを特徴とするタイヤ用トレッドゴム組成物。
- 請求項1ないし6のいずれか1項において、前記変性スチレン−ブタジエンゴムがスズ変性スチレン−ブタジエンゴムであることを特徴とするタイヤ用トレッドゴム組成物。
- 請求項4ないし7のいずれか1項において、前記カーボンブラックが、HAF、ISAF、及びSAFよりなる群から選ばれる1種又は2種以上であることを特徴とするタイヤ用トレッドゴム組成物。
- 請求項5ないし8のいずれか1項において、前記シリカが表面改質シリカであることを特徴とするタイヤ用トレッドゴム組成物。
- 請求項1ないし9のいずれか1項において、ゴム成分100重量部中の前記変性天然ゴムの割合が10〜90重量部であることを特徴とするタイヤ用トレッドゴム組成物。
- 請求項1ないし10のいずれか1項において、ゴム成分100重量部中の前記変性スチレン−ブタジエンゴムの割合が10〜90重量部であることを特徴とするタイヤ用トレッドゴム組成物。
- 請求項4ないし11のいずれか1項において、前記カーボンブラックの含有量がゴム成分100重量部に対して20〜100重量部であることを特徴とするタイヤ用トレッドゴム組成物。
- 請求項5ないし12のいずれか1項において、前記シリカの含有量がゴム成分100重量部に対して20〜60重量部であることを特徴とするタイヤ用トレッドゴム組成物。
- 請求項6ないし13のいずれか1項において、前記シランカップリング剤の含有量が前記シリカの重量に対して1〜20重量%であることを特徴とするタイヤ用トレッドゴム組成物。
- 請求項5ないし14のいずれか1項において、前記カーボンブラックとシリカの合計の含有量がゴム成分100重量部に対して30〜120重量部であり、カーボンブラックとシリカとの合計に占めるカーボンブラックの割合が20重量%以上であることを特徴とするタイヤ用トレッドゴム組成物。
- 請求項1ないし15のいずれか1項に記載のタイヤ用トレッドゴム組成物をトレッドゴムに使用したことを特徴とする空気入りタイヤ。
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JP2008038119A (ja) * | 2006-08-10 | 2008-02-21 | Bridgestone Corp | 重荷重用空気入りタイヤ |
WO2010104149A1 (ja) * | 2009-03-11 | 2010-09-16 | Jsr株式会社 | ゴム組成物及び空気入りタイヤ |
JP2010209253A (ja) * | 2009-03-11 | 2010-09-24 | Jsr Corp | ゴム組成物及び空気入りタイヤ |
JP2010209254A (ja) * | 2009-03-11 | 2010-09-24 | Jsr Corp | ゴム組成物及び空気入りタイヤ |
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JP2008007698A (ja) * | 2006-06-30 | 2008-01-17 | Bridgestone Corp | ゴム組成物及びそれを用いたタイヤ |
JP2008038119A (ja) * | 2006-08-10 | 2008-02-21 | Bridgestone Corp | 重荷重用空気入りタイヤ |
WO2010104149A1 (ja) * | 2009-03-11 | 2010-09-16 | Jsr株式会社 | ゴム組成物及び空気入りタイヤ |
JP2010209253A (ja) * | 2009-03-11 | 2010-09-24 | Jsr Corp | ゴム組成物及び空気入りタイヤ |
JP2010209254A (ja) * | 2009-03-11 | 2010-09-24 | Jsr Corp | ゴム組成物及び空気入りタイヤ |
JP2010209256A (ja) * | 2009-03-11 | 2010-09-24 | Jsr Corp | ゴム組成物及び空気入りタイヤ |
JP2010209255A (ja) * | 2009-03-11 | 2010-09-24 | Jsr Corp | ゴム組成物及び空気入りタイヤ |
CN102348748A (zh) * | 2009-03-11 | 2012-02-08 | Jsr株式会社 | 橡胶组合物和充气轮胎 |
CN102348748B (zh) * | 2009-03-11 | 2013-09-04 | Jsr株式会社 | 橡胶组合物和充气轮胎 |
WO2017017123A1 (fr) * | 2015-07-29 | 2017-02-02 | Compagnie Generale Des Etablissements Michelin | Pneumatique d'avion |
FR3039556A1 (fr) * | 2015-07-29 | 2017-02-03 | Michelin & Cie | Pneumatique d'avion |
JP2018522988A (ja) * | 2015-07-29 | 2018-08-16 | コンパニー ゼネラール デ エタブリッスマン ミシュラン | 航空機タイヤ |
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