WO2023281855A1 - タイヤ用ゴム組成物 - Google Patents
タイヤ用ゴム組成物 Download PDFInfo
- Publication number
- WO2023281855A1 WO2023281855A1 PCT/JP2022/014283 JP2022014283W WO2023281855A1 WO 2023281855 A1 WO2023281855 A1 WO 2023281855A1 JP 2022014283 W JP2022014283 W JP 2022014283W WO 2023281855 A1 WO2023281855 A1 WO 2023281855A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- mass
- rubber
- transition temperature
- glass transition
- thermoplastic resin
- Prior art date
Links
- 229920001971 elastomer Polymers 0.000 title claims abstract description 72
- 239000000203 mixture Substances 0.000 title claims abstract description 71
- 239000005060 rubber Substances 0.000 title claims abstract description 71
- 230000009477 glass transition Effects 0.000 claims abstract description 52
- 229920005992 thermoplastic resin Polymers 0.000 claims abstract description 50
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims abstract description 22
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims abstract description 11
- 229920002554 vinyl polymer Polymers 0.000 claims abstract description 11
- 239000004014 plasticizer Substances 0.000 claims abstract description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 46
- 229920003244 diene elastomer Polymers 0.000 claims description 32
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 26
- 239000000377 silicon dioxide Substances 0.000 claims description 23
- 125000000217 alkyl group Chemical group 0.000 claims description 3
- 125000004432 carbon atom Chemical group C* 0.000 claims description 2
- 239000011521 glass Substances 0.000 claims 1
- 230000007704 transition Effects 0.000 claims 1
- 150000001993 dienes Chemical class 0.000 abstract description 12
- 238000002156 mixing Methods 0.000 abstract description 11
- 239000005062 Polybutadiene Substances 0.000 abstract description 4
- 229920002857 polybutadiene Polymers 0.000 abstract description 4
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 abstract description 3
- 239000004615 ingredient Substances 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 8
- 239000011347 resin Substances 0.000 description 8
- 229920005989 resin Polymers 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 238000013329 compounding Methods 0.000 description 6
- 230000006866 deterioration Effects 0.000 description 6
- 239000003921 oil Substances 0.000 description 6
- 238000004073 vulcanization Methods 0.000 description 6
- 239000006087 Silane Coupling Agent Substances 0.000 description 5
- 125000003545 alkoxy group Chemical group 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 150000003505 terpenes Chemical class 0.000 description 4
- 235000007586 terpenes Nutrition 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 229920006271 aliphatic hydrocarbon resin Polymers 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- -1 oxysilyl groups Chemical group 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-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
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 2
- 235000021355 Stearic acid Nutrition 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 125000003172 aldehyde group Chemical group 0.000 description 2
- 125000005370 alkoxysilyl group Chemical group 0.000 description 2
- 125000003368 amide group Chemical group 0.000 description 2
- 125000003277 amino group Chemical group 0.000 description 2
- 229920006272 aromatic hydrocarbon resin Polymers 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 125000003700 epoxy group Chemical group 0.000 description 2
- 125000001301 ethoxy group Chemical group [H]C([H])([H])C([H])([H])O* 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- 238000012844 infrared spectroscopy analysis Methods 0.000 description 2
- 239000011256 inorganic filler Substances 0.000 description 2
- 229910003475 inorganic filler Inorganic materials 0.000 description 2
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 2
- 229920003049 isoprene rubber Polymers 0.000 description 2
- ZBKFYXZXZJPWNQ-UHFFFAOYSA-N isothiocyanate group Chemical group [N-]=C=S ZBKFYXZXZJPWNQ-UHFFFAOYSA-N 0.000 description 2
- 239000007788 liquid Substances 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
- 125000002347 octyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 125000005372 silanol group Chemical group 0.000 description 2
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 125000003808 silyl group Chemical group [H][Si]([H])([H])[*] 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000008117 stearic acid Substances 0.000 description 2
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- 235000014692 zinc oxide Nutrition 0.000 description 2
- DLNKOYKMWOXYQA-CBAPKCEASA-N (-)-norephedrine Chemical compound C[C@H](N)[C@H](O)C1=CC=CC=C1 DLNKOYKMWOXYQA-CBAPKCEASA-N 0.000 description 1
- 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
- KPAPHODVWOVUJL-UHFFFAOYSA-N 1-benzofuran;1h-indene Chemical compound C1=CC=C2CC=CC2=C1.C1=CC=C2OC=CC2=C1 KPAPHODVWOVUJL-UHFFFAOYSA-N 0.000 description 1
- ROGIWVXWXZRRMZ-UHFFFAOYSA-N 2-methylbuta-1,3-diene;styrene Chemical compound CC(=C)C=C.C=CC1=CC=CC=C1 ROGIWVXWXZRRMZ-UHFFFAOYSA-N 0.000 description 1
- 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 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 description 1
- 239000004606 Fillers/Extenders Substances 0.000 description 1
- 244000043261 Hevea brasiliensis Species 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 239000006057 Non-nutritive feed additive Substances 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- VLLYOYVKQDKAHN-UHFFFAOYSA-N buta-1,3-diene;2-methylbuta-1,3-diene Chemical compound C=CC=C.CC(=C)C=C VLLYOYVKQDKAHN-UHFFFAOYSA-N 0.000 description 1
- 125000004106 butoxy group Chemical group [*]OC([H])([H])C([H])([H])C(C([H])([H])[H])([H])[H] 0.000 description 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 239000007822 coupling agent Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000000113 differential scanning calorimetry Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 125000003187 heptyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000004051 hexyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 125000001147 pentyl group Chemical group C(CCCC)* 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 239000000088 plastic resin Substances 0.000 description 1
- 229920001084 poly(chloroprene) Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 125000002572 propoxy group Chemical group [*]OC([H])([H])C(C([H])([H])[H])([H])[H] 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000012763 reinforcing filler Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005987 sulfurization reaction Methods 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 229910000349 titanium oxysulfate Inorganic materials 0.000 description 1
- VTHOKNTVYKTUPI-UHFFFAOYSA-N triethoxy-[3-(3-triethoxysilylpropyltetrasulfanyl)propyl]silane Chemical compound CCO[Si](OCC)(OCC)CCCSSSSCCC[Si](OCC)(OCC)OCC VTHOKNTVYKTUPI-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L15/00—Compositions of rubber derivatives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
- B60C1/0016—Compositions of the tread
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/54—Silicon-containing compounds
- C08K5/541—Silicon-containing compounds containing oxygen
- C08K5/5415—Silicon-containing compounds containing oxygen containing at least one Si—O bond
- C08K5/5419—Silicon-containing compounds containing oxygen containing at least one Si—O bond containing at least one Si—C bond
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction
Definitions
- the present invention relates to a rubber composition for tires that achieves both performance on snow and dry grip performance.
- On-snow performance and dry grip performance are mentioned as important performances required for all-season tires (see Patent Document 1, for example).
- Patent Document 1 On-snow performance and dry grip performance are mentioned as important performances required for all-season tires.
- a method of increasing the glass transition temperature of the tire rubber composition and a method of increasing the compounding amount of a highly reinforcing filler have been known.
- An object of the present invention is to provide a rubber composition for tires that achieves both performance on snow and dry grip performance.
- the rubber composition for tires of the present invention which achieves the above object, is a rubber composition obtained by blending 10 to 50 parts by mass of a thermoplastic resin with 100 parts by mass of a diene rubber containing 60% by mass or more of styrene-butadiene rubber.
- the diene-based rubber and the thermoplastic resin are blended at a mass ratio of 1:1, the diene-based The theoretical value (Tga) of the glass transition temperature of the mixture calculated from the average glass transition temperature (Tg1) of the rubber and the glass transition temperature (Tg2) of the thermoplastic resin, and the measured value (Tgm) of the glass transition temperature of the mixture.
- thermoplastic resin accounts for 30% by mass or more of the total 100% by mass of the plasticizer component contained in the rubber composition.
- the average glass transition temperature (Tg1) of the diene rubber is preferably -45°C or lower, and the glass transition temperature (Tg2) of the thermoplastic resin is preferably 30 to 80°C.
- the ratio of the mass of the thermoplastic resin to the mass of the styrene-butadiene rubber is preferably 0.1 to 0.6.
- the styrene-butadiene rubber preferably has a modifying group at at least one end of its molecular chain.
- the rubber composition for tires preferably contains 10 to 150 parts by mass of silica with respect to 100 parts by mass of the diene rubber. It is more preferable to blend 1 to 20% by mass of.
- the rubber composition for tires consists of a diene rubber containing 60% by mass or more of styrene-butadiene rubber.
- Styrene-butadiene rubber has a styrene content of 5 to 30% by mass and a vinyl content of 10 to 35% by mass, and has a specific relationship with the thermoplastic resin.
- the styrene content of the styrene-butadiene rubber is 5-30% by mass. When the styrene content is 5% by mass or more, good dry grip is obtained. When the styrene content is 30% by mass or less, deterioration of wear resistance can be suppressed.
- the styrene content is preferably 10-25% by weight, more preferably 10-20% by weight. In this specification, the styrene content of styrene-butadiene rubber shall be determined by infrared spectroscopic analysis (Hampton method).
- the vinyl content of the styrene-butadiene rubber is 10-35% by mass.
- the vinyl content is preferably 20-34% by weight, more preferably 25-32% by weight.
- the vinyl content of styrene-butadiene rubber shall be determined by infrared spectroscopic analysis (Hampton method).
- the styrene-butadiene rubber is preferably a modified styrene-butadiene rubber having a modifying group at at least one end of its molecular chain.
- modifying groups include carboxy groups, amino groups, hydroxy groups, alkoxy groups, silyl groups, alkoxysilyl groups, oxysilyl groups, silanol groups, epoxy groups, amide groups, isocyanate groups, isothiocyanate groups, carbonyl groups, aldehyde groups, and the like. is mentioned.
- the diene-based rubber may be any diene-based rubber that is normally used for tires.
- diene-based rubbers other than styrene-butadiene rubber include natural rubber, isoprene rubber, butadiene rubber, styrene-isoprene rubber, isoprene-butadiene rubber, ethylene-propylene-diene copolymer rubber, chloroprene rubber, acrylonitrile-butadiene rubber, and the like. can.
- These diene-based rubbers may be modified with one or more functional groups.
- functional groups are not particularly limited, for example, epoxy group, carboxy group, amino group, hydroxy group, alkoxy group, silyl group, alkoxysilyl group, amide group, oxysilyl group, silanol group, isocyanate group, isothiocyanate group, carbonyl group, aldehyde group, and the like.
- the average glass transition temperature (Tg1) of the diene rubber containing styrene-butadiene rubber is preferably -45°C or lower. By setting the average glass transition temperature (Tg1) of the diene rubber to ⁇ 45° C. or lower, performance on snow can be improved, which is preferable.
- the average glass transition temperature (Tg1) is more preferably -100°C to -50°C, still more preferably -80°C to -55°C.
- the glass transition temperatures of diene-based rubbers, thermoplastic resins, and mixtures thereof are measured by differential scanning calorimetry (DSC) under the condition of a temperature increase rate of 20° C./min. be the temperature of the point.
- DSC differential scanning calorimetry
- the rubber composition for tires shall contain 60% by mass or more of the above-described styrene-butadiene rubber in 100% by mass of the diene rubber. By containing 60% by mass or more of styrene-butadiene rubber, performance on snow can be ensured.
- Styrene-butadiene rubber is preferably 60 to 100% by mass, more preferably 70 to 90% by mass, still more preferably 75 to 85% by mass.
- a rubber composition for tires is required to combine a diene rubber and a thermoplastic resin so that the diene rubber and the thermoplastic resin simultaneously satisfy the following relationships (i) and (ii). i.e. (i)
- a mixture obtained by blending a diene rubber and a thermoplastic resin at a mass ratio of 1:1 hereinafter sometimes simply referred to as a "mixture"
- Tga-Tgm the average glass transition temperature of the diene rubber and the heat
- the difference (Tga-Tgm) between the theoretical value (Tga) of the glass transition temperature of the mixture calculated from the glass transition temperature (Tg2) of the plastic resin and the measured value (Tgm) of the glass transition temperature of the mixture is less than 5 ° C. to be.
- the difference (Tg2-Tg1) between the average glass transition temperature (Tg1) of the diene rubber and the glass transition temperature (Tg2) of the thermoplastic resin is 50 to 105°C.
- the average glass transition temperature (Tg1) of the diene rubber, the glass transition temperature (Tg2) of the thermoplastic resin, and the glass transition temperature (Tgm) of the mixture are measured by the above methods.
- the theoretical value (Tga) of the glass transition temperature of the mixture can be calculated as a weighted average value from the glass transition temperatures and mass ratios of the diene rubber and the thermoplastic resin.
- the difference (Tga-Tgm) between the theoretical value (Tga) of the glass transition temperature of the mixture and the measured value (Tgm) of the glass transition temperature of the mixture is set to less than 5 ° C. Improves grip and rolling resistance.
- the difference (Tga-Tgm) is preferably 0-4°C, more preferably 0-2°C.
- the difference (Tg2-Tg1) between the average glass transition temperature (Tg1) of the diene rubber and the glass transition temperature (Tg2) of the thermoplastic resin is preferably 60 to 100°C, more preferably 70 to 100°C.
- thermoplastic resin By blending 10 to 50 parts by mass of a thermoplastic resin with 100 parts by mass of diene rubber, the rubber composition for tires can achieve both performance on snow and dry grip performance. If the thermoplastic resin is less than 10 parts by mass, the effect of improving dry grip performance cannot be sufficiently obtained. If the thermoplastic resin exceeds 50 parts by mass, performance on snow will deteriorate.
- the thermoplastic resin is preferably blended in an amount of 15 to 45 parts by mass, more preferably 20 to 40 parts by mass.
- the thermoplastic resin preferably accounts for 30% by mass or more of the total 100% by mass of the plasticizer component contained in the rubber composition. By making the thermoplastic resin content 30% by mass or more, the effect of improving the dry grip performance can be obtained, which is preferable.
- the thermoplastic resin is more preferably 35 to 100% by mass, still more preferably 40 to 100% by mass, in the total 100% by mass of the plasticizer component.
- plasticizer components contained in the rubber composition include thermoplastic resins, natural oils, synthetic oils, oil extenders (oils) contained in diene rubbers, and liquid rubbers.
- the thermoplastic resin preferably has a mass ratio of 0.1 to 0.6 with respect to the mass of the styrene-butadiene rubber described above.
- a mass ratio of 0.1 or more is preferable because the distribution of the thermoplastic resin in the rubber composition becomes uniform.
- the thermoplastic resin is dispersed in the base rubber component in the rubber composition, which is preferable.
- the mass ratio of the thermoplastic resin to the mass of the styrene-butadiene rubber is more preferably 0.2-0.5, more preferably 0.3-0.5.
- the glass transition temperature (Tg2) of the thermoplastic resin is preferably 30-80°C, more preferably 35-75°C, and even more preferably 40-75°C. By setting the glass transition temperature (Tg2) to 30°C or higher, excessive adhesion of the rubber composition can be suppressed, which is preferable. Further, by setting the glass transition temperature (Tg2) to 80° C. or less, the dissolution in the rubber becomes uniform, which is preferable.
- the softening point of the thermoplastic resin is preferably 80-125°C, more preferably 90-125°C, and even more preferably 95-125°C.
- the softening point of the thermoplastic resin shall be measured based on JIS K6220-1 (ring and ball method).
- thermoplastic resin is not particularly limited as long as it simultaneously satisfies the relationships (i) and (ii) described above with the diene rubber.
- thermoplastic resins include terpene resins, terpene phenol resins, rosin resins, rosin ester resins, C5/C9 resins, and coumarone-indene resins. Among them, C5/C9 resins and terpene resins are preferred.
- the rubber composition for tires preferably contains 10 to 150 parts by mass of silica with respect to 100 parts by mass of diene rubber. It is preferable to blend up to 20% by mass.
- the dispersibility of silica can be improved by blending 1% by mass or more of the alkylalkoxysilane based on the amount of silica. Also, by blending 20% by mass or less, it is possible to suppress deterioration of the reinforcing property of silica, which is preferable.
- Alkylalkoxysilane is more preferably blended in an amount of 3 to 15% by mass, more preferably 4 to 12% by mass of the amount of silica.
- the alkyl group having 3 to 8 carbon atoms may be linear, branched, cyclic, or a combination thereof, preferably linear.
- Examples of the alkyl group include propyl group, butyl group, pentyl group, hexyl group, heptyl group, octyl group, etc., and octyl group is more preferable.
- the alkylalkoxysilane is preferably an alkyltrialkoxysilane having three alkoxy groups.
- Examples of the alkoxy group include methoxy group, ethoxy group, propoxy group, butoxy group and the like, and ethoxy group is preferred.
- the rubber composition for tires contains 100 parts by mass of diene rubber and 10 to 150 parts by mass of silica.
- silica By blending 10 parts by mass or more of silica, wet grip properties and abrasion resistance can be improved. Moreover, deterioration of rolling resistance can be suppressed by blending 150 parts by mass or less of silica.
- Silica is preferably blended in an amount of 50 to 135 parts by mass, more preferably 60 to 125 parts by mass.
- Examples of silica include wet silica (hydrous silicic acid), dry silica (anhydrous silicic acid), calcium silicate, aluminum silicate, etc. These may be used alone or in combination of two or more. Alternatively, surface-treated silica obtained by treating the surface of silica with a silane coupling agent may be used.
- the rubber composition for tires preferably contains a silane coupling agent together with silica, so that the dispersibility of silica can be improved.
- a silane coupling agent a type that is usually blended with silica can be used.
- the silane coupling agent is preferably blended in an amount of 5 to 15% by mass, more preferably 8 to 12% by mass of the amount of silica.
- the rubber composition for tires can contain inorganic fillers other than silica.
- inorganic fillers include carbon black, calcium carbonate, magnesium carbonate, talc, clay, mica, alumina, aluminum hydroxide, titanium oxide, and calcium sulfate. These other fillers may be used alone or in combination of two or more.
- Tire rubber compositions are generally used in tire rubber compositions such as vulcanizing or cross-linking agents, vulcanization accelerators, antioxidants, plasticizers, processing aids, liquid polymers, and thermosetting resins.
- Various additives can be blended within a range that does not impair the object of the present invention.
- such additives can be kneaded by a common method to form a rubber composition for tires and used for vulcanization or crosslinking.
- the blending amount of these additives can be a conventional general blending amount as long as it does not contradict the object of the present invention.
- the rubber composition for tires described above is preferably a rubber composition for tire treads, and can suitably constitute the tread portion of a tire.
- a tire having a tread portion made of the rubber composition for a tire of the present invention can achieve both performance on snow and dry grip performance.
- the tire may be either a pneumatic tire or a non-pneumatic tire.
- the compounding agents shown in Table 2 were used as a common compounding agent, and the tire rubber compositions (Examples 1 to 5, Reference Example 1, Comparative Examples 1 to 6) having the compoundings shown in Table 1 were prepared, excluding sulfur and vulcanization accelerators.
- the ingredients were kneaded in a 1.7 L internal Banbury mixer for 5 minutes before being discharged from the mixer and allowed to cool to room temperature.
- a rubber composition for a tire was prepared by putting this into the above-described 1.7 L internal Banbury mixer, adding sulfur and a vulcanization accelerator, and mixing.
- the compounding amounts of the compounding agents shown in Table 2 are shown in parts by mass with respect to 100 parts by mass of the diene rubber shown in Table 1.
- Performance on Snow The pneumatic tire obtained above was mounted on a standard rim, filled with air pressure of 250 kPa, and mounted on a test vehicle. The test vehicle was run on a compacted snow road surface, and the braking distance was measured when braking was applied at an initial speed of 40 km/h. The reciprocals of the obtained results were calculated and described in the column of "performance on snow" as an index with the value of Reference Example 1 set to 100. A larger index means a shorter braking distance and better performance on snow.
- Dry Grip Performance The pneumatic tire obtained above was mounted on a standard rim, filled with air pressure of 250 kPa, and mounted on a test vehicle. The test vehicle was run on a dry road surface with relatively little unevenness, and the braking distance was measured when braking was applied at an initial speed of 100 km/h. The reciprocals of the obtained results were calculated, and the values of Reference Example 1 were set to 100, and the indices were listed in the "dry grip performance" column. The larger the index, the shorter the braking distance and the better the dry grip performance.
- ⁇ SBR-1 Modified solution-polymerized styrene-butadiene rubber having a hydroxyl group, NS612 manufactured by ZS Elastomer, glass transition temperature of -61°C, styrene content of 15% by mass, vinyl content of 31% by mass
- SBR-2 Solution-polymerized styrene-butadiene rubber, F3420 manufactured by Asahi Kasei Corporation, glass transition temperature of ⁇ 32° C., styrene content of 37% by mass, vinyl content of 44% by mass
- Resin-1 C5 resin, IMPERA R1508 manufactured by Eastman, glass transition temperature of 42 ° C.
- Resin-2 Terpene resin, YS resin PX1150N manufactured by Yasuhara Chemical Co., Ltd., glass transition temperature of 65 ° C.
- Silica ZEOSIL 1165MP manufactured by Solvay, CTAB adsorption specific surface area of 160 m 2 /g ⁇ Carbon black: Seast 9M manufactured by Tokai Carbon Co., Ltd., nitrogen adsorption specific surface area of 150 m 2 /g ⁇
- Coupling agent silane coupling agent, Si69 manufactured by Evonik Degussa, bis (triethoxysilylpropyl) tetrasulfide ⁇
- Aroma oil Extract No. 4S manufactured by Showa Shell Sekiyu K.K.
- ⁇ Stearic acid Bead stearic acid manufactured by NOF Corporation ⁇ Zinc white: Zinc oxide 3 types manufactured by Seido Chemical Industry Co., Ltd.
- ⁇ Antiaging agent Santoflex 6PPD manufactured by Flexis ⁇ Sulfur: Mucron OT-20 manufactured by Shikoku Kasei Co., Ltd.
- ⁇ Vulcanization accelerator-1 Noxcellar CZ manufactured by Ouchi Shinko Kagaku Co., Ltd.
- ⁇ Vulcanization accelerator-2 Perkacit DPG manufactured by Flexis
- the tire rubber compositions of Examples 1 to 5 are excellent in performance on snow and dry grip performance.
- the tire rubber composition of Comparative Example 1 contains less than 60% by mass of the specific styrene-butadiene rubber, and therefore has poor on-snow performance.
- the tire rubber composition of Comparative Example 2 contains less than 10 parts by mass of the thermoplastic resin, and therefore has poor dry grip performance. Since the rubber composition for tire of Comparative Example 3 contains more than 50 parts by mass of the thermoplastic resin, the on-snow performance is poor.
- the tire rubber composition of Comparative Example 4 is inferior in dry grip performance because the thermoplastic resin is less than 30% by mass in the total 100% by mass of the plasticizer component.
- the tire rubber composition of Comparative Example 5 has poor on-snow performance because the difference (Tg2-Tg1) between Tg1 of the diene rubber and Tg2 of the thermoplastic resin exceeds 105°C.
- the rubber composition for tires of Comparative Example 6 was the difference (Tga-Tgm) between the theoretical value (Tga) and the measured value (Tgm) of the glass transition temperature of a mixture of a diene rubber and a thermoplastic resin at a mass ratio of 1:1. exceeds 5°C, the dry grip performance is inferior.
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Abstract
Description
(i)ジエン系ゴムおよび熱可塑性樹脂を質量比1:1で配合した混合物(以下、単に「混合物」と略記することがある。)において、ジエン系ゴムの平均ガラス転移温度(Tg1)および熱可塑性樹脂のガラス転移温度(Tg2)から計算される混合物のガラス転移温度の理論値(Tga)と、混合物のガラス転移温度の測定値(Tgm)との差(Tga-Tgm)が5℃未満であること。
(ii)ジエン系ゴムの平均ガラス転移温度(Tg1)および熱可塑性樹脂のガラス転移温度(Tg2)の差(Tg2-Tg1)が50~105℃であること。
本明細書において、ジエン系ゴムの平均ガラス転移温度(Tg1)および熱可塑性樹脂のガラス転移温度(Tg2)、並びに混合物のガラス転移温度(Tgm)は、上記方法で測定するものとする。また、混合物のガラス転移温度の理論値(Tga)は、ジエン系ゴムおよび熱可塑性樹脂のガラス転移温度および質量比から加重平均値として算出することができる。
上記で得られた空気入りタイヤを標準リムに組み付け、空気圧250kPaを充填し、試験車両に装着した。試験車両を圧雪路面上を走行させ、初速40km/時で制動をかけたときの制動距離を測定した。得られた結果は、それぞれの逆数を算出し、基準例1の値を100にする指数としての「雪上性能」の欄に記載した。この指数が大きいほど制動距離が短く、雪上性能が優れることを意味する。
上記で得られた空気入りタイヤを標準リムに組み付け、空気圧250kPaを充填し、試験車両に装着した。試験車両を比較的凸凹の少ない乾燥路面上を走行させ、初速100km/時で制動をかけたときの制動距離を測定した。得られた結果は、それぞれの逆数を算出し、基準例1の値を100にする指数として「ドライグリップ性能」の欄に記載した。この指数が大きいほど制動距離が短く、ドライグリップ性能が優れることを意味する。
・SBR-1:ヒドロキシ基を有する変性溶液重合スチレンブタジエンゴム、ZSエラストマー社製NS612、ガラス転移温度が-61℃、スチレン含量が15質量%、ビニル含量が31質量%
・SBR-2:溶液重合スチレンブタジエンゴム、旭化成社製F3420、ガラス転移温度が-32℃、スチレン含量が37質量%、ビニル含量が44質量%
・樹脂-1:C5樹脂、イーストマン社製IMPERA R1508、ガラス転移温度が42℃
・樹脂-2:テルペン樹脂、ヤスハラケミカル社製YSレジン PX1150N、ガラス転移温度が65℃
・シリカ:Solvay社製ZEOSIL 1165MP、CTAB吸着比表面積が160m2/g
・カーボンブラック:東海カーボン社製シースト9M、窒素吸着比表面積が150m2/g
・カップリング剤:シランカップリング剤、Evonik Degussa社製Si69、ビス(トリエトキシシリルプロピル)テトラスルフィド
・アロマオイル:昭和シェル石油社製エキストラクト4号S
・ステアリン酸:日油社製ビーズステアリン酸
・亜鉛華:正同化学工業社製酸化亜鉛3種
・老化防止剤:フレキシス社製サントフレックス6PPD
・硫黄:四国化成工業社製ミュークロンOT-20
・加硫促進剤-1:大内新興化学社製ノクセラーCZ
・加硫促進剤-2:フレキシス社製PerkacitDPG
比較例1のタイヤ用ゴム組成物は、特定のスチレンブタジエンゴムが60質量%未満なので、雪上性能が劣る。
比較例2のタイヤ用ゴム組成物は、熱可塑性樹脂が10質量部未満なので、ドライグリップ性能が劣る。
比較例3のタイヤ用ゴム組成物は、熱可塑性樹脂が50質量部を超えるので、雪上性能が劣る。
比較例4のタイヤ用ゴム組成物は、可塑剤成分の合計100質量%中、熱可塑性樹脂が30質量%未満なので、ドライグリップ性能が劣る。
比較例5のタイヤ用ゴム組成物は、ジエン系ゴムのTg1および熱可塑性樹脂のTg2の差(Tg2-Tg1)が105℃を超えるので、雪上性能が劣る。
比較例6のタイヤ用ゴム組成物は、ジエン系ゴムと熱可塑性樹脂の質量比1:1の混合物のガラス転移温度の理論値(Tga)と測定値(Tgm)との差(Tga-Tgm)が5℃を超えるので、ドライグリップ性能が劣る。
Claims (7)
- スチレンブタジエンゴムを60質量%以上含むジエン系ゴム100質量部に、熱可塑性樹脂を10~50質量部配合してなるゴム組成物であって、前記スチレンブタジエンゴムのスチレン含量が5~30質量%、ビニル含量が10~35質量%であり、前記ジエン系ゴムおよび熱可塑性樹脂を質量比1:1で配合した混合物において、前記ジエン系ゴムの平均ガラス転移温度(Tg1)および熱可塑性樹脂のガラス転移温度(Tg2)から計算される前記混合物のガラス転移温度の理論値(Tga)と、前記混合物のガラス転移温度の測定値(Tgm)との差(Tga-Tgm)が5℃未満である関係を満たし、かつ前記ジエン系ゴムの平均ガラス転移温度(Tg1)および熱可塑性樹脂のガラス転移温度(Tg2)の差(Tg2-Tg1)が50~105℃であり、前記ゴム組成物中に含まれる可塑剤成分の合計100質量%中、前記熱可塑性樹脂が30質量%以上であるタイヤ用ゴム組成物。
- 前記ジエン系ゴムの平均ガラス転移温度(Tg1)が-45℃以下である請求項1に記載のタイヤ用ゴム組成物。
- 前記スチレンブタジエンゴムの質量に対する前記熱可塑性樹脂の質量の比が0.1~0.6である請求項1または2に記載のタイヤ用ゴム組成物。
- 前記熱可塑性樹脂のガラス転移温度(Tg2)が30~80℃である請求項1~3のいずれかに記載のタイヤ用ゴム組成物。
- 前記スチレンブタジエンゴムが、その分子鎖の少なくとも1つの末端に変性基を有する請求項1~4のいずれかに記載のタイヤ用ゴム組成物。
- さらにシリカを、前記ジエン系ゴム100質量部に対し、10~150質量部配合してなる請求項1~5のいずれかに記載のタイヤ用ゴム組成物。
- 炭素数3~8のアルキル基を有するアルキルアルコキシシランを、前記シリカ量の1~20質量%配合してなる請求項6に記載のタイヤ用ゴム組成物。
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WO2023176830A1 (ja) * | 2022-03-16 | 2023-09-21 | 横浜ゴム株式会社 | タイヤ用ゴム組成物 |
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WO2023176830A1 (ja) * | 2022-03-16 | 2023-09-21 | 横浜ゴム株式会社 | タイヤ用ゴム組成物 |
WO2023176832A1 (ja) * | 2022-03-16 | 2023-09-21 | 横浜ゴム株式会社 | タイヤ用ゴム組成物 |
JP2023135762A (ja) * | 2022-03-16 | 2023-09-29 | 横浜ゴム株式会社 | タイヤ用ゴム組成物 |
JP7397362B2 (ja) | 2022-03-16 | 2023-12-13 | 横浜ゴム株式会社 | タイヤ用ゴム組成物 |
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