WO2023032664A1 - ゴム組成物およびその製造方法ならびにタイヤ製品 - Google Patents
ゴム組成物およびその製造方法ならびにタイヤ製品 Download PDFInfo
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- WO2023032664A1 WO2023032664A1 PCT/JP2022/031006 JP2022031006W WO2023032664A1 WO 2023032664 A1 WO2023032664 A1 WO 2023032664A1 JP 2022031006 W JP2022031006 W JP 2022031006W WO 2023032664 A1 WO2023032664 A1 WO 2023032664A1
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- WIPO (PCT)
- Prior art keywords
- rubber
- sulfur
- rubber composition
- mass
- hydrocarbon polymer
- Prior art date
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- 229930003836 cresol Natural products 0.000 description 1
- 125000002433 cyclopentenyl group Chemical group C1(=CCCC1)* 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- AFZSMODLJJCVPP-UHFFFAOYSA-N dibenzothiazol-2-yl disulfide Chemical compound C1=CC=C2SC(SSC=3SC4=CC=CC=C4N=3)=NC2=C1 AFZSMODLJJCVPP-UHFFFAOYSA-N 0.000 description 1
- 230000000447 dimerizing effect Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000012990 dithiocarbamate Substances 0.000 description 1
- 150000004659 dithiocarbamates Chemical class 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000007720 emulsion polymerization reaction Methods 0.000 description 1
- 125000003700 epoxy group Chemical group 0.000 description 1
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 229920001973 fluoroelastomer Polymers 0.000 description 1
- 229920005560 fluorosilicone rubber Polymers 0.000 description 1
- 125000002485 formyl group Chemical class [H]C(*)=O 0.000 description 1
- 238000010528 free radical solution polymerization reaction Methods 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 description 1
- 150000002357 guanidines Chemical class 0.000 description 1
- 229920000588 gutta-percha Polymers 0.000 description 1
- RBTKNAXYKSUFRK-UHFFFAOYSA-N heliogen blue Chemical compound [Cu].[N-]1C2=C(C=CC=C3)C3=C1N=C([N-]1)C3=CC=CC=C3C1=NC([N-]1)=C(C=CC=C3)C3=C1N=C([N-]1)C3=CC=CC=C3C1=N2 RBTKNAXYKSUFRK-UHFFFAOYSA-N 0.000 description 1
- 239000004312 hexamethylene tetramine Substances 0.000 description 1
- 235000010299 hexamethylene tetramine Nutrition 0.000 description 1
- 230000000887 hydrating effect Effects 0.000 description 1
- 150000003840 hydrochlorides Chemical class 0.000 description 1
- 229920002681 hypalon Polymers 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000001023 inorganic pigment Substances 0.000 description 1
- 239000011630 iodine Substances 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- HTUMBQDCCIXGCV-UHFFFAOYSA-N lead oxide Chemical compound [O-2].[Pb+2] HTUMBQDCCIXGCV-UHFFFAOYSA-N 0.000 description 1
- YEXPOXQUZXUXJW-UHFFFAOYSA-N lead(II) oxide Inorganic materials [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 125000005395 methacrylic acid group Chemical group 0.000 description 1
- NFWSQSCIDYBUOU-UHFFFAOYSA-N methylcyclopentadiene Chemical compound CC1=CC=CC1 NFWSQSCIDYBUOU-UHFFFAOYSA-N 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- DZCCLNYLUGNUKQ-UHFFFAOYSA-N n-(4-nitrosophenyl)hydroxylamine Chemical compound ONC1=CC=C(N=O)C=C1 DZCCLNYLUGNUKQ-UHFFFAOYSA-N 0.000 description 1
- 229920006173 natural rubber latex Polymers 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 239000002540 palm oil Substances 0.000 description 1
- LVMTVPFRTKXRPH-UHFFFAOYSA-N penta-1,2-diene Chemical compound CCC=C=C LVMTVPFRTKXRPH-UHFFFAOYSA-N 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- PMJHHCWVYXUKFD-UHFFFAOYSA-N piperylene Natural products CC=CC=C PMJHHCWVYXUKFD-UHFFFAOYSA-N 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000098 polyolefin 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
- 229920002743 polystyrene-poly(ethylene-ethylene/propylene) block-polystyrene Polymers 0.000 description 1
- 239000005077 polysulfide Substances 0.000 description 1
- 229920001021 polysulfide Polymers 0.000 description 1
- 150000008117 polysulfides Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 235000019260 propionic acid Nutrition 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- IUVKMZGDUIUOCP-BTNSXGMBSA-N quinbolone Chemical compound O([C@H]1CC[C@H]2[C@H]3[C@@H]([C@]4(C=CC(=O)C=C4CC3)C)CC[C@@]21C)C1=CCCC1 IUVKMZGDUIUOCP-BTNSXGMBSA-N 0.000 description 1
- 238000010526 radical polymerization reaction Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000003549 soybean oil Substances 0.000 description 1
- 235000012424 soybean oil Nutrition 0.000 description 1
- 229920001935 styrene-ethylene-butadiene-styrene Polymers 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- UGNWTBMOAKPKBL-UHFFFAOYSA-N tetrachloro-1,4-benzoquinone Chemical compound ClC1=C(Cl)C(=O)C(Cl)=C(Cl)C1=O UGNWTBMOAKPKBL-UHFFFAOYSA-N 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 238000012719 thermal polymerization Methods 0.000 description 1
- 229920002725 thermoplastic elastomer Polymers 0.000 description 1
- 150000003557 thiazoles Chemical class 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
- 150000003739 xylenols Chemical class 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 239000004246 zinc acetate Substances 0.000 description 1
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 1
- WDHVIZKSFZNHJB-UHFFFAOYSA-L zinc;butanoate Chemical compound [Zn+2].CCCC([O-])=O.CCCC([O-])=O WDHVIZKSFZNHJB-UHFFFAOYSA-L 0.000 description 1
- XKMZOFXGLBYJLS-UHFFFAOYSA-L zinc;prop-2-enoate Chemical compound [Zn+2].[O-]C(=O)C=C.[O-]C(=O)C=C XKMZOFXGLBYJLS-UHFFFAOYSA-L 0.000 description 1
- XDWXRAYGALQIFG-UHFFFAOYSA-L zinc;propanoate Chemical compound [Zn+2].CCC([O-])=O.CCC([O-])=O XDWXRAYGALQIFG-UHFFFAOYSA-L 0.000 description 1
- DUBNHZYBDBBJHD-UHFFFAOYSA-L ziram Chemical compound [Zn+2].CN(C)C([S-])=S.CN(C)C([S-])=S DUBNHZYBDBBJHD-UHFFFAOYSA-L 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
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- C08L9/06—Copolymers with styrene
-
- 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
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
-
- 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
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L21/00—Compositions of unspecified rubbers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L57/00—Compositions of unspecified polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- 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 and a manufacturing method thereof.
- the present invention also relates to tire products manufactured using the rubber composition.
- tires are manufactured from a rubber composition containing vulcanizing agents, fillers such as carbon black and silica, and anti-aging agents and waxes that suppress quality deterioration. has been done.
- the present inventors have made intensive studies to solve the above problems, and surprisingly found that a rubber additive containing a specific sulfur-containing hydrocarbon polymer was added to a rubber component having a high glass transition temperature. It has been found that the wear resistance of a tire manufactured using the rubber composition obtained by blending the above is improved rather than deteriorated. The present inventors have completed the present invention based on such findings.
- a rubber component having a glass transition temperature of ⁇ 60° C. or higher a rubber additive comprising a sulfur-containing hydrocarbon polymer; including The sulfur-containing hydrocarbon polymer is a reaction product of an unsaturated hydrocarbon polymer and sulfur, and the unsaturated hydrocarbon contains an alicyclic unsaturated compound,
- the rubber additive comprises a sulfur-containing hydrocarbon polymer
- the sulfur-containing hydrocarbon polymer is a reaction product of an unsaturated hydrocarbon polymer and sulfur, and the unsaturated hydrocarbon contains an alicyclic unsaturated compound
- a method for producing a rubber composition wherein the sulfur-containing hydrocarbon polymer has a weight average molecular weight of 500 or more and 4000 or less. [15] A tire product produced using the rubber composition according to any one of [1] to [13].
- the present invention it is possible to provide a rubber composition for producing tires with excellent wear resistance. Furthermore, according to the present invention, a tire having excellent wet grip and steering stability can be manufactured.
- the rubber composition of the present invention contains a rubber component and a rubber additive, and may further contain a filler. Tires produced using the rubber composition of the present invention are excellent in wear resistance, wet grip and steering stability.
- the content of the rubber component is preferably 20% by mass or more and 80% by mass or less, more preferably 25% by mass or more and 75% by mass or less, and still more preferably 30% by mass, based on the total solid mass of the rubber composition. It is more than mass % and below 70 mass %.
- the content of the rubber additive is preferably 1 part by mass or more and 30 parts by mass or less, more preferably 3 parts by mass or more and 25 parts by mass or less, and still more preferably 5 parts by mass with respect to 100 parts by mass of the rubber component.
- the content of the filler is preferably 10 parts by mass or more and less than 200 parts by mass, more preferably 15 parts by mass or more and 180 parts by mass or less, and still more preferably 20 parts by mass or more with respect to 100 parts by mass of the rubber component. It is 160 parts by mass or less, more preferably 30 parts by mass or more and 130 parts by mass or less, and particularly preferably 40 parts by mass or more and 110 parts by mass or less.
- the rubber component used in the rubber composition has a glass transition temperature (Tg) of -60°C or higher, preferably -55°C or higher, more preferably -50°C or higher, and preferably -10°C or lower. , more preferably ⁇ 15° C. or lower, and still more preferably ⁇ 20° C. or lower.
- Tg glass transition temperature
- the glass transition temperature (Tg) of the rubber component is preferably ⁇ 55° C. or higher and ⁇ 10° C. or lower, more preferably ⁇ 50° C. or higher and ⁇ 10° C. or lower, and still more preferably ⁇ 50° C. or higher and ⁇ 15° C. or less, and more preferably -50°C or higher and -20°C or lower.
- a tire using a rubber component having a glass transition temperature (Tg) within the above numerical range is preferable because it has good rolling resistance, excellent wet grip performance, and excellent wear resistance.
- a rubber component having a glass transition temperature (Tg) within the above numerical range is used, and silica is used as a filler in a suitable amount described in detail below (10 parts by mass or more and less than 200 parts by mass with respect to 100 parts by mass of the rubber component) ) are suitable as HPT (high performance tires), fuel-efficient tires, and all-season tires.
- HPT high performance tires
- the Tg of the rubber component after mixing should be within the above range.
- the Tg of the rubber component can be measured by a conventionally known method.
- the Tg of the rubber component can be measured by differential thermal analysis (DTA) or differential scanning calorimetry (DSC).
- the rubber component is not particularly limited as long as it satisfies the above Tg, but it preferably contains a diene rubber.
- the following sulfur-containing hydrocarbon polymers have higher reactivity with diene-based rubbers than unsaturated petroleum resins (containing no sulfur), which are general unsaturated hydrocarbon polymers, and react with rubber molecular chains. easy to do
- aromatic vinyl-conjugated diene copolymer rubber As the diene rubber, it is preferable to use at least one of aromatic vinyl-conjugated diene copolymer rubber and conjugated diene (co)polymer rubber.
- Aromatic vinyl-conjugated diene copolymer rubbers include styrene-butadiene rubber (SBR), styrene-isoprene-butadiene rubber, styrene-isoprene rubber, and styrene- ⁇ -methylstyrene-butadiene rubber.
- Conjugated diene (co)polymer rubbers include butadiene rubber (BR), natural rubber (NR), isoprene rubber (IR), and the like.
- diene rubbers include nitrile rubber (NBR), chloroprene rubber (CR), ethylene-propylene-diene terpolymer rubber (EPDM), butyl rubber (IIR), and modified dienes thereof. system rubber.
- Modified diene rubbers include diene rubbers that have undergone modifications such as main chain modification, single end modification, both end modification, and hydrogenation.
- the modified functional group of the modified synthetic diene rubber includes various functional groups such as an epoxy group, an amino group, an alkoxysilyl group, and a hydroxyl group. It may be contained in rubber.
- At least one selected from the group consisting of styrene-butadiene rubber, butadiene rubber, natural rubber, and isoprene rubber is preferably used, and selected from the group consisting of styrene-butadiene rubber, butadiene rubber, and natural rubber. It is more preferable to use at least one kind of rubber, and it is even more preferable to use at least styrene-butadiene rubber.
- the method for producing the diene rubber is not particularly limited, and examples thereof include emulsion polymerization, solution polymerization, radical polymerization, anionic polymerization and cationic polymerization.
- natural rubber examples include natural rubber latex, technical grade rubber (TSR), smoked sheet (RSS), gutta-percha, Eucommia-derived natural rubber, guayule-derived natural rubber, Russian dandelion-derived natural rubber, plant component fermented rubber, and the like.
- modified natural rubber such as epoxidized natural rubber, methacrylic acid-modified natural rubber, styrene-modified natural rubber, sulfonic acid-modified natural rubber, and zinc sulfonate-modified natural rubber, which are obtained by modifying these natural rubbers, are also included in natural rubber. .
- the ratio of cis/trans/vinyl in the double bond portion of natural rubber and synthetic diene rubber is not particularly limited, and any ratio can be suitably used.
- the number average molecular weight and molecular weight distribution of the diene rubber are not particularly limited, but the number average molecular weight is preferably 500 to 3,000,000 and the molecular weight distribution is preferably 1.5 to 15.
- non-diene rubber may be blended in addition to diene rubber.
- a wide range of known rubbers can be used as the non-diene rubber. Specific examples include olefin rubber such as ethylene/propylene rubber (EPM), chlorosulfonated polyethylene rubber (CSM), acrylic rubber (ACM), urethane rubber (U), and silicone rubber (VMQ, PVMQ, FVMQ). , fluororubber (FKM) and polysulfide rubber (T).
- the rubber composition of the present invention can also contain an elastomer other than the above rubber components within a range that does not impair its functions.
- Elastomers include polystyrenes such as styrene-isoprene-styrene triblock copolymer (SIS), styrene-butadiene-styrene triblock copolymer (SBS), and their hydrogenated products (SEBS, SEPS, SEEPS).
- Thermoplastic elastomers selected from the group consisting of elastomeric polymers, polyolefin-based elastomers, polyvinyl chloride-based elastomers, polyurethane-based elastomers, polyester-based elastomers, and polyamide-based elastomers.
- the content of the diene rubber in the rubber component is preferably 10% by mass or more, more preferably 30% by mass or more, and still more preferably 50% by mass or more, relative to the total amount of the rubber component.
- the total content of the aromatic vinyl-conjugated diene copolymer rubber and the conjugated diene (co)polymer rubber in the rubber component is preferably 70% by mass or more, more preferably 70% by mass or more, based on the total amount of the rubber component. is 80% by mass or more, more preferably 90% by mass or more.
- Rubber additives used in rubber compositions include the following sulfur-containing hydrocarbon polymers.
- an additive such as a conventionally known petroleum resin that raises the glass transition temperature of the rubber component is blended with the above rubber component having a high glass transition temperature, the durability of the tire manufactured using the obtained rubber composition is reduced. Abrasion worsens.
- a tire manufactured using a rubber composition obtained by blending a rubber component having a high glass transition temperature with a rubber additive containing the following sulfur-containing hydrocarbon polymer. can improve the wear resistance of Therefore, the following sulfur-containing hydrocarbon polymer can be used as a wear resistance improver for tires.
- Sulfur-containing hydrocarbon polymers are reaction products of polymers of unsaturated hydrocarbons and sulfur.
- the sulfur-containing hydrocarbon polymer is preferably a reaction product obtained by reacting an unsaturated bond of an unsaturated hydrocarbon polymer with sulfur.
- the weight average molecular weight (Mw) of the sulfur-containing hydrocarbon polymer is 500 or more and 4000 or less, and the lower limit is preferably 600 or more, more preferably 700 or more, still more preferably 800 or more, and The upper limit is preferably 3,000 or less, more preferably 2,000 or less, even more preferably 1,500 or less.
- the weight average molecular weight (Mw) of the sulfur-containing hydrocarbon polymer is preferably 600 or more and 3000 or less, more preferably 700 or more and 2000 or less, still more preferably 800 or more and 1500 or less.
- the sulfur-containing hydrocarbon polymer is suppressed from bonding to each other via sulfur, increasing the amount of sulfur bonded to the rubber component, and improving wear resistance, Wet grip and steering stability can be further improved.
- the molecular weight distribution (Mw/number average molecular weight (Mn)) of the sulfur-containing hydrocarbon polymer is preferably 1.0 or more and 5.0 or less, more preferably 1.0 or more and 4.0 or less, It is more preferably 1.0 or more and 3.0 or less, and still more preferably 1.0 or more and 2.5 or less.
- the weight average molecular weight (Mw) and molecular weight distribution (Mw/Mn) can be measured by a conventionally known GPC (gel permeation chromatography) analysis method.
- At least a hydrocarbon having an unsaturated bond for reacting with sulfur is used as a raw material for the polymer.
- the unsaturated hydrocarbon contains an alicyclic unsaturated compound, and the alicyclic unsaturated hydrocarbon is preferably a compound having a norbornene skeleton. This is because the double bond structure of the norbornene skeleton is distorted and has good reactivity with sulfur.
- the unsaturated bonds of the alicyclic unsaturated compound may remain after reaction with sulfur or may be completely consumed.
- Unsaturated bonds in alicyclic unsaturated compounds include unsaturated bonds present in the norbornene skeleton and unsaturated bonds present in the cyclopentene skeleton. More preferably, all the bonds are consumed.
- useful compounds such as ethylene, propylene and butadiene, among fractions obtained by thermal decomposition of naphtha, are used as unsaturated hydrocarbon polymers from the viewpoint of industrial production.
- a resin (hereinafter referred to as “petroleum resin”) obtained by polymerizing the removed remaining fraction in a mixed state can be used.
- Petroleum resins generally include aliphatic petroleum resins (C5 petroleum resins) obtained by (co)polymerizing C5 fractions, and (co)polymerizing C9 fractions obtained by pyrolysis of naphtha.
- Aromatic petroleum resins obtained by the above, and copolymer petroleum resins (C5/C9 petroleum resins) obtained by copolymerizing the C5 fraction and the C9 fraction.
- the petroleum resin has different properties depending on the olefin content in the raw material, but it is a transparent pale yellow to yellowish brown resin with a molecular weight of 200 to 8000 and a softening point of 5 to 180 ° C. is.
- alicyclic unsaturated hydrocarbon petroleum resin a petroleum resin obtained by (co)polymerizing a fraction containing an alicyclic unsaturated hydrocarbon (hereinafter referred to as "alicyclic unsaturated hydrocarbon petroleum resin") is used. use.
- the alicyclic unsaturated hydrocarbon petroleum resin is obtained, for example, by dimerizing the cyclopentadienes contained in the C5 fraction to obtain dicyclopentadienes, separating from the other C5 fractions by distillation, and heating. Including those polymerized by the Diels-Alder reaction.
- Cyclopentadienes include, for example, cyclopentadiene, methylcyclopentadiene, and the like.
- the dicyclopentadienes include, for example, dicyclopentadiene (DCPD), methyldicyclopentadiene, etc. Dicyclopentadiene is particularly preferred.
- the alicyclic unsaturated hydrocarbon petroleum resin may contain C5 fractions and C9 fractions other than cyclopentadienes.
- the C5 fraction generally uses a fraction with a boiling point range of about 20 to 110°C among the fractions obtained by thermal cracking of petroleum.
- Examples of C5 fractions other than cyclopentadienes include olefinic hydrocarbons such as 1-pentene, 2-pentene, 2-methyl-1-butene, 2-methyl-2-butene, and 3-methyl-1-butene. , 2-methyl-1,3-butadiene, 1,2-pentadiene, 1,3-pentadiene, and 3-methyl-1,2-butadiene.
- the C9 fraction is generally a fraction with a boiling point range of about 100 to 280°C among the fractions obtained by thermal cracking of petroleum.
- Examples of the C9 fraction include styrene homologues such as ⁇ -methylstyrene, ⁇ -methylstyrene and ⁇ -methylstyrene, and indene homologues such as indene and coumarone.
- Friedel-Crafts type catalyst is added in an amount of 0.01 to 5% by weight based on the raw material oil, and the polymerization reaction is carried out. After completion of the reaction, the Friedel-Crafts-type catalyst is decomposed and removed using alkali, and finally unreacted oil and low-molecular-weight polymer are removed by distillation or the like.
- Friedel-Crafts-type catalysts generally include, for example, aluminum trichloride, aluminum tribromide, boron trifluoride or their phenol complexes, butanol complexes, and the like.
- the polymerization temperature is preferably 0 to 100°C, particularly preferably 0 to 80°C.
- the catalyst amount and the polymerization time are preferably 0.1 to 10 hours when the catalyst is 0.1 to 2.0 parts by mass with respect to 100 parts by mass of the raw material oil.
- the reaction pressure is preferably atmospheric pressure to 1 MPa.
- the petroleum resin may be partially polymerized with compounds having various functional groups.
- functional groups include alcohol compounds and phenol compounds having hydroxyl groups.
- alcohol compounds include alcohol compounds having double bonds such as allyl alcohol and 2-butene-1,4-diol.
- phenolic compound alkylphenols such as phenol, cresol, xylenol, pt-butylphenol, p-octylphenol and p-nonylphenol can be used. These hydroxyl-containing compounds may be used alone, or two or more of them may be used in combination.
- Hydroxyl group-containing petroleum resins can be obtained by thermally polymerizing a (meth)acrylic acid alkyl ester or the like together with a petroleum fraction to introduce an ester group into the petroleum resin, and then reducing the ester group. Alternatively, it can be produced by a method of hydrating the introduced double bond.
- the hydroxyl group-containing petroleum resin those obtained by the various methods described above can be used, but from the viewpoint of performance and production, it is preferable to use a phenol-modified petroleum resin or the like.
- the phenol-modified petroleum resin is obtained by cationic polymerization of the C9 fraction in the presence of phenol, and is easy to modify.
- the method of polymerization is not particularly limited, and is selected from, for example, the above-mentioned Diels-Alder reaction, a thermal polymerization reaction in which heating is performed at about 150 to 300 ° C. for about 1 to 10 hours, and the above-mentioned Friedel-Crafts-type reaction. can.
- These resins described above preferably have a softening point of 200°C or less (measurement method: ASTM E28-58-T), more preferably 45 to 160°C.
- a partially hydrogenated petroleum resin obtained by hydrogenating part of the double bonds in the above petroleum resin can also be used.
- Hydrogenation conditions are arbitrary, but at least one solvent selected from saturated chain hydrocarbons, saturated alicyclic hydrocarbons and aromatic hydrocarbons having a boiling point of 140 to 280° C. at normal pressure and a petroleum resin and reaction using a general hydrogenation catalyst containing nickel, molybdenum, cobalt, palladium, platinum, etc., at a reaction temperature of 150 to 320 ° C., a reaction pressure of 3 to 30 MPa, and a reaction time of 1 to 10 hours. I do.
- C5, C9, and C5/C9 petroleum resins having double bonds in the molecule include Neoresin EP-140 (softening point: 140°C) manufactured by ENEOS Corporation, and manufactured by Maruzen Petrochemical Co., Ltd. Marukaretsu M-890A (softening point: 105°C), Maruzen Petrochemical Co., Ltd.
- Marukaretsu M-845A (softening point: 145°C), ENEOS T-REZ RB093 (softening point: 92°C), ENEOS ) T-REZ RB100 (softening point: 98°C), ENEOS T-REZ RC093 (softening point: 93°C), ENEOS T-REZ RC100 (softening point: 97°C), ENEOS ( T-REZ RC115 manufactured by ENEOS Corporation (softening point: 112°C), T-REZ RD104 manufactured by ENEOS Corporation (softening point: 102°C), T-REZ PR802 manufactured by ENEOS Corporation (softening point: 89°C), Japan Zeon Co., Ltd.
- a sulfur-containing hydrocarbon polymer can be produced by reacting an unsaturated hydrocarbon with sulfur in a molten state while heating in the absence of a solvent. By conducting the heating reaction in the absence of a solvent rather than in a solvent, it is possible to reduce the weight average molecular weight of the sulfur-containing hydrocarbon polymer while reducing the variation in molecular weight.
- the conditions for the heating reaction are not particularly limited and can be set as appropriate. is 0.5 to 10 hours, more preferably 1 to 8 hours. The weight average molecular weight of the sulfur-containing hydrocarbon polymer can be adjusted by adjusting the heating reaction conditions.
- the amount of sulfur added to the petroleum resin is not particularly limited, but it is preferably 0.1 equivalent or more, preferably 0.3 to 5 equivalents, per unsaturated bond (double bond) of the unsaturated hydrocarbon.
- a compound having a norbornene skeleton, particularly dicyclopentadiene, as the unsaturated alicyclic hydrocarbon it is preferable to use a compound having a norbornene skeleton, particularly dicyclopentadiene, as the unsaturated alicyclic hydrocarbon.
- the double bond on the norbornene skeleton of the dicyclopentadiene reacts with sulfur, and more preferably only the double bond on the norbornene skeleton reacts with sulfur. It can be confirmed by 1 H-NMR that the double bond on the norbornene skeleton was consumed by reaction with sulfur.
- fillers examples include silica, carbon black, and barium sulfate. At least one of silica and carbon black is preferably used, and silica is more preferably used.
- silica examples include, but are not limited to, dry process silica, wet process silica, colloidal silica, and precipitated silica. Among these, wet-process silica containing hydrous silicic acid as a main component is preferable. These silicas can be used alone or in combination of two or more.
- the specific surface area of silica is not particularly limited, but the nitrogen adsorption specific surface area (BET method) is usually in the range of 10 to 400 m 2 /g, preferably 20 to 300 m 2 /g, more preferably 120 to 190 m 2 /g. . If the specific surface area of silica is within the above numerical range, mechanical properties and the like can be improved.
- the nitrogen adsorption specific surface area is a value measured by the BET method according to ASTM D3037-81.
- silane coupling agent When blending silica, it is preferable to blend a silane coupling agent.
- a known silane coupling agent can be used as the silane coupling agent.
- bis[3-(triethoxysilyl)propyl]tetrasulfide, bis[3-(triethoxysilyl)propyl]disulfide, 3-octanoylthio-1-propyltriethoxysilane) and A homocondensate thereof or a cocondensate with 3-mercaptopropyltriethoxysilane may be mentioned.
- a commercially available bis[3-(triethoxysilyl)propyl]tetrasulfide may be used, for example, Si-69 manufactured by Evonik.
- Bis[3-(triethoxysilyl)propyl]disulfide may also be commercially available, such as Si-75 manufactured by Evonik.
- 3-octanoylthio-1-propyltriethoxysilane a commercially available product such as NXT-silane manufactured by Momentive can be used.
- the condensate of 3-octanoylthio-1-propyltriethoxysilane a commercially available one may be used, for example, NXT-Z45 silane manufactured by Momentive. mentioned.
- the content of the silane coupling agent is preferably 1 to 20% by mass, more preferably 2 to 10% by mass of the amount of silica.
- the rubber composition of the present invention may be treated with vulcanizing agents, vulcanization accelerators, auxiliary vulcanization accelerators, anti-aging agents, softening agents, antioxidants, coloring agents, etc., to the extent that their functions are not impaired.
- vulcanizing agents vulcanizing agents, vulcanization accelerators, auxiliary vulcanization accelerators, anti-aging agents, softening agents, antioxidants, coloring agents, etc.
- auxiliary vulcanization accelerators may be included.
- Vulcanizing agents include sulfur-based vulcanizing agents such as powdered sulfur, precipitated sulfur, highly dispersible sulfur, surface-treated sulfur, insoluble sulfur, dimorpholine disulfide, alkylphenol disulfide, zinc oxide, magnesium oxide, litharge, p-quinonedioxime, p-dibenzoylquinonedioxime, tetrachloro-p-benzoquinone, poly-p-dinitrobenzene, methylenedianiline, phenol resin, brominated alkylphenol resin, chlorinated alkylphenol resin and the like.
- the content of the vulcanizing agent is preferably 0.1 to 10 parts by mass, more preferably 1 to 5 parts by mass, per 100 parts by mass of the rubber component.
- Vulcanization accelerators include thiuram-based agents such as tetramethylthiuram disulfide (TMTD), tetraethylthiuram disulfide (TETD), tetramethylthiuram monosulfide (TMTM), aldehyde/ammonia-based agents such as hexamethylenetetramine, and diphenylguanidine (DPG).
- TMTD tetramethylthiuram disulfide
- TETD tetraethylthiuram disulfide
- TMTM tetramethylthiuram monosulfide
- DPG diphenylguanidine
- guanidines such as 2-mercaptobenzothiazole (MBT), thiazoles such as dibenzothiazyldisulfide (DM), N-cyclohexyl-2-benzothiazylsulfenamide (CBS), Nt-butyl-2 -Sulfenamides such as benzothiazylsulfenamide (BBS), and dithiocarbamates such as zinc dimethyldithiocarbamate (ZnPDC).
- the content of the vulcanization accelerator is preferably 0.1 to 10 parts by mass, more preferably 1 to 5 parts by mass, per 100 parts by mass of the rubber component.
- Vulcanization acceleration aids include fatty acids such as acetic acid, propionic acid, butanoic acid, stearic acid, acrylic acid, and maleic acid, zinc acetate, zinc propionate, zinc butyrate, zinc stearate, zinc acrylate, zinc maleate, and the like. and fatty acid zinc salts thereof, zinc oxide, and the like.
- the content of the vulcanization accelerator aid is preferably 0.1 to 10 parts by mass, more preferably 1 to 5 parts by mass, per 100 parts by mass of the rubber component.
- anti-aging agents examples include compounds such as aliphatic and aromatic hindered amines and hindered phenols.
- the content of the antioxidant is preferably 0.1 to 10 parts by mass, more preferably 1 to 5 parts by mass, per 100 parts by mass of the rubber component.
- antioxidants examples include butylhydroxytoluene (BHT) and butylhydroxyanisole (BHA).
- BHT butylhydroxytoluene
- BHA butylhydroxyanisole
- the content of the antioxidant is preferably 0.1 to 10 parts by mass, more preferably 1 to 5 parts by mass, per 100 parts by mass of the rubber component.
- the softening agent conventionally known ones can be used, and it is not particularly limited, but petroleum-based softening agents such as aroma oil, paraffin oil, naphthenic oil, palm oil, castor oil, cottonseed oil, soybean oil, etc. and the like. At the time of use, one of these may be used singly or two or more may be appropriately selected and used.
- a softening agent is contained, from the viewpoint of ease of handling, among the above softening agents, those that are liquid at room temperature such as 25 ° C., for example, petroleum softening agents such as aroma oil, paraffin oil, naphthenic oil is preferably contained, and aromatic oils are particularly preferred.
- the softener content is preferably 10 to 200 parts by mass, more preferably 20 to 100 parts by mass, per 100 parts by mass of the rubber component.
- coloring agents include inorganic pigments such as titanium dioxide, zinc oxide, ultramarine, red iron oxide, lithopone, lead, cadmium, iron, cobalt, aluminum, hydrochlorides and sulfates, azo pigments, and copper phthalocyanine pigments.
- the content of the coloring agent is preferably 0.1 to 10 parts by mass, more preferably 1 to 5 parts by mass, per 100 parts by mass of the rubber component.
- processing aids can be kneaded with the rubber component using a known rubber kneader, such as a roll, Banbury mixer, kneader, etc., vulcanized under arbitrary conditions, and used as a rubber composition.
- the amount of other processing aids to be added can be a conventional general content as long as it does not contradict the object of the present invention.
- the method for producing the rubber composition of the present invention comprises a step of kneading at least the above rubber component and the above rubber additive.
- the method for producing the rubber composition may preferably further comprise the step of kneading the vulcanizing agent. More preferably, it may further comprise a step of kneading the vulcanizing agent and the vulcanization accelerator.
- the other processing aids described above can be appropriately blended and kneaded within a range that does not impair the functions of the rubber composition.
- a conventionally known kneading device can be used for the production of the rubber composition, and the kneading temperature, time, mixing order, etc. can be appropriately selected.
- tire products can be produced by conventionally known methods and common technical knowledge widely known to those skilled in the art.
- Tire products include tires and other related components.
- the rubber composition is extruded, then molded using a tire molding machine, and then heated and pressurized using a vulcanizer to form crosslinks, whereby a tire can be manufactured.
- a tire manufactured using the rubber composition of the present invention is excellent in wear resistance, wet grip, and steering stability.
- tires there are no particular restrictions on the use of tires, and examples include tires for passenger cars, tires for heavy loads, tires for motorcycles (motorcycles), and studless tires. Among these, it can be suitably used for tires for passenger cars. In particular, it can be suitably used for HPT (high performance tires), fuel-efficient tires, and all-season tires.
- the shape, structure, size and material of the tire are not particularly limited and can be selected as appropriate according to the purpose.
- the rubber composition of the present invention can be applied to each part of a tire.
- the applicable portion of the tire is not particularly limited, and may be appropriately selected from the tread, carcass, sidewall, inner liner, undertread, belt portion, etc. of the tire according to the purpose.
- Rubber product The rubber composition of the present invention can also be used to produce rubber products other than tire products.
- Rubber products other than tires include automobile rubber parts (exterior, interior, weather strips, boots, mounts, seals, sealers, gaskets), hoses, belts, sheets, anti-vibration rubber, rollers, linings. , rubberized cloth, sealing materials, gloves, fenders, medical rubber (syringe gaskets, tubes, catheters), gaskets (for home appliances, construction), asphalt modifiers, grips, toys, shoes, sandals, keys Pads, gears, PET bottle cap liners and the like are included.
- Example 1 Each of the following components was kneaded using a 250 mL kneader (Laboplastomill manufactured by Toyo Seiki Co., Ltd.) to obtain a rubber composition. Details of the kneading operation performed are as follows (i) to (iii). (i) Mixer kneading: Put the rubber component into a closed pressure kneader heated to 130°C, masticate at 30 rpm for 1 minute, and then mix 1 of silica, zinc oxide, stearic acid, and anti-aging agent.
- Example 2 A rubber composition was prepared in the same manner as in Example 1, except that 5.6 parts by mass of silane coupling agent 2 (manufactured by Evonik, trade name: Si-75) was added instead of silane coupling agent 1 (Si69). Obtained.
- Example 3 A rubber composition was prepared in the same manner as in Example 1, except that 5.6 parts by mass of silane coupling agent 3 (manufactured by Evonik, trade name: Si-363) was added instead of silane coupling agent 1 (Si69). Obtained.
- Example 4 A rubber composition was prepared in the same manner as in Example 1, except that 5.6 parts by mass of silane coupling agent 4 (manufactured by Momentive, trade name: NXT-Silane) was added instead of silane coupling agent 1 (Si69). Obtained.
- silane coupling agent 4 manufactured by Momentive, trade name: NXT-Silane
- Example 5 A rubber composition was prepared in the same manner as in Example 1, except that 5.6 parts by mass of silane coupling agent 5 (manufactured by Momentive, trade name: NXT-Z45 silane) was added instead of silane coupling agent 1 (Si69). got
- Example 6 A rubber composition was obtained in the same manner as in Example 1, except that the amount of silica added was changed to 40 parts by mass.
- Example 2 A rubber composition was obtained in the same manner as in Example 6, except that 15 parts by mass of the hydrocarbon polymer E was added instead of the sulfur-containing hydrocarbon polymer A, and the amount of sulfur added was changed to 1.5 parts by mass. .
- Example 7 A rubber composition was obtained in the same manner as in Example 1, except that the amount of silica added was changed to 150 parts by mass.
- Example 8 Rubber was prepared in the same manner as in Example 1, except that the amount of SBR (A) (Tg: -27°C) added as the rubber component was changed to 70 parts by mass and 30 parts by mass of BR (Tg: -100°C) was added. A composition was obtained.
- Example 9 The amount of SBR (A) (Tg: -27°C) as a rubber component was changed to 60 parts by mass, and 20 parts by mass of BR (Tg: -100°C) and 20 parts by mass of NR (Tg: -79°C) were added.
- a rubber composition was obtained in the same manner as in Example 1, except that
- Example 5 A rubber composition was obtained in the same manner as in Example 9 except that 15 parts by mass of the hydrocarbon polymer E was added instead of the sulfur-containing hydrocarbon polymer A and the amount of sulfur added was changed to 1.5 parts by mass. .
- Example 10 Rubber was prepared in the same manner as in Example 1 except that the amount of SBR (A) (Tg: -27°C) added as the rubber component was changed to 60 parts by mass and 40 parts by mass of BR (Tg: -100°C) was added. A composition was obtained.
- Example 6 A rubber composition was obtained in the same manner as in Example 10, except that 15 parts by mass of the hydrocarbon polymer E was added instead of the sulfur-containing hydrocarbon polymer A, and the amount of sulfur added was changed to 1.5 parts by mass. .
- Comparative Example 7 A rubber composition was obtained in the same manner as in Comparative Example 1, except that 100 parts by mass of SBR (B) (Tg: -64°C) was added instead of SBR (A) as the rubber component.
- Comparative Example 8 A rubber composition was obtained in the same manner as in Comparative Example 7, except that 15 parts by mass of sulfur-containing hydrocarbon polymer A was added instead of hydrocarbon polymer E, and the amount of sulfur added was changed to 1 part by mass.
- dumbbell-shaped test piece was punched out from each rubber sheet, and a tensile test was performed at a tensile speed of 500 mm / min in accordance with JIS K6251 (published in 2010), and 100% modulus [MPa] at room temperature (25 ° C.) measured by
- the 100% modulus value which is an index of the crosslink density of each rubber sheet, was adjusted so as to be approximately close to each other, and then other physical properties were confirmed.
- Example 1 to 5 are described as relative values when each value in Comparative Example 1 is set to 100, and Example 6 is Comparative Example 2.
- Example 7 is described as a relative value when each value in Comparative Example 3 is 100
- Example 8 is described as a relative value when each value in Comparative Example 4 is 100
- Example 9 is described as a relative value when each value in Comparative Example 5 is set to 100
- Example 10 is described as a relative value when each value in Comparative Example 6 is set to 100.
- Comparative Example 8 was described as a relative value when each value in Comparative Example 7 was set to 100
- Comparative Example 10 was described as a relative value when each value in Comparative Example 9 was set to 100.
- Example 9 and Comparative Example 5 From the results of Example 9 and Comparative Example 5, by adding the sulfur-containing hydrocarbon polymer A instead of the sulfur-free hydrocarbon polymer E to the rubber component having a glass transition temperature of ⁇ 50° C., The rubber sheet obtained was excellent in abrasion resistance, wet grip, and steering stability. From the results of Example 10 and Comparative Example 6, by adding the sulfur-containing hydrocarbon polymer A instead of the sulfur-free hydrocarbon polymer E to the rubber component having a glass transition temperature of ⁇ 56° C., The rubber sheet obtained was excellent in abrasion resistance, wet grip, and steering stability.
- Example 11 A rubber composition was obtained in the same manner as in Example 8, except that 15 parts by mass of the sulfur-containing hydrocarbon polymer B was added instead of the sulfur-containing hydrocarbon polymer A.
- Example 12 A rubber composition was obtained in the same manner as in Example 8, except that 15 parts by mass of sulfur-containing hydrocarbon polymer C was added instead of sulfur-containing hydrocarbon polymer A.
- Example 13 A rubber composition was obtained in the same manner as in Example 8, except that 15 parts by mass of sulfur-containing hydrocarbon polymer D was added instead of sulfur-containing hydrocarbon polymer A.
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Abstract
Description
[1] ガラス転移温度が-60℃以上であるゴム成分と、
含硫黄炭化水素重合体を含むゴム用添加剤と、
を含み、
前記含硫黄炭化水素重合体が、不飽和炭化水素の重合体と硫黄との反応生成物であり、前記不飽和炭化水素が脂環式不飽和化合物を含み、
前記含硫黄炭化水素重合体の重量平均分子量が500以上4000以下である、ゴム組成物。
[2] 前記脂環式不飽和炭化水素が、ノルボルネン骨格を有する化合物を含む、[1]に記載のゴム組成物。
[3] 前記ノルボルネン骨格を有する化合物が、ジシクロペンタジエンを含む、[2]に記載のゴム組成物。
[4] 前記ノルボルネン骨格中の不飽和結合が硫黄と反応してなる、[2]または[3]に記載のゴム組成物。
[5] 前記ゴム成分のガラス転移温度が-50℃以上-10℃以下である、[1]~[4]のいずれかに記載のゴム組成物。
[6] 前記含硫黄炭化水素重合体の重量平均分子量が700以上2000以下である、[1]~[5]のいずれかに記載のゴム組成物。
[7] 前記ゴム成分が、芳香族ビニル-共役ジエン共重合体ゴムおよび共役ジエン(共)重合体ゴムからなる群から選択される少なくとも1種である、[1]~[6]のいずれかに記載のゴム組成物。
[8] 前記ゴム成分が、スチレン-ブタジエンゴム、ブタジエンゴム、天然ゴム、およびイソプレンゴムからなる群から選択される少なくとも1種を含む、[1]~[7]のいずれかに記載のゴム組成物。
[9] 充填剤をさらに含む、[1]~[8]のいずれかに記載のゴム組成物。
[10] 前記充填剤が、シリカおよびカーボンブラックからなる群から選択される少なくとも1種を含む、[9]に記載のゴム組成物。
[11] 前記充填剤の含有量は、前記ゴム成分100質量部に対して10質量部以上200質量部未満である、[9]に記載のゴム組成物。
[12] 前記ゴム用添加剤が、タイヤの耐摩耗性向上剤である、[1]~[11]のいずれかに記載のゴム組成物。
[13] タイヤ製品用である、[1]~[12]のいずれかに記載のゴム組成物。
[14] 少なくともゴム成分とゴム用添加剤とを混練する工程を含む、ゴム組成物の製造方法であって、
前記ゴム成分のガラス転移温度が-60℃以上であり、
前記ゴム用添加剤が、含硫黄炭化水素重合体を含み、
前記含硫黄炭化水素重合体が、不飽和炭化水素の重合体と硫黄との反応生成物であり、前記不飽和炭化水素が脂環式不飽和化合物を含み、
前記含硫黄炭化水素重合体の重量平均分子量が500以上4000以下である、ゴム組成物の製造方法。
[15] [1]~[13]のいずれかに記載のゴム組成物を用いて製造されたタイヤ製品。
本発明のゴム組成物は、ゴム成分と、ゴム用添加剤とを含み、充填剤をさらに含んでもよい。本発明のゴム組成物を用いて製造したタイヤは、耐摩耗性、ウェットグリップ性および操縦安定性に優れる。ゴム成分の含有量は、ゴム組成物の固形分質量全体に対して、好ましくは20質量%以上80質量%以下であり、より好ましくは25質量%以上75質量%以下であり、さらに好ましくは30質量%以上70質量%以下である。ゴム用添加剤の含有量は、ゴム成分100質量部に対して好ましくは1質量部以上30質量部以下であり、より好ましくは3質量部以上25質量部以下であり、さらに好ましくは5質量部以上20質量部以下である。充填剤の含有量は、ゴム成分100質量部に対して、好ましくは10質量部以上200質量部未満であり、より好ましくは15質量部以上180質量部以下であり、さらに好ましくは20質量部以上160質量部以下であり、さらにより好ましくは30質量部以上130質量部以下であり、特に好ましくは40質量部以上110質量部以下である。
ゴム組成物に用いるゴム成分は、ガラス転移温度(Tg)が-60℃以上であり、好ましくは-55℃以上であり、より好ましくは-50℃以上であり、また、好ましくは-10℃以下であり、より好ましくは-15℃以下であり、さらに好ましくは-20℃以下である。特に、ゴム成分のガラス転移温度(Tg)は、好ましくは-55℃以上-10℃以下であり、より好ましくは-50℃以上-10℃以下であり、さらに好ましくは-50℃以上-15℃以下であり、さらにより好ましくは-50℃以上-20℃以下である。ガラス転移温度(Tg)が上記数値範囲内のゴム成分を用いたタイヤは、良好な転がり抵抗特性及び優れたウェットグリップ性能を有し、耐摩耗性に優れているために好ましい。特にガラス転移温度(Tg)が上記数値範囲内のゴム成分を用い、かつ、充填剤としてシリカを下記で詳述する好適な量(ゴム成分100質量部に対して10質量部以上200質量部未満)を含有させたタイヤは、HPT(ハイパフォーマンスタイヤ)、低燃費タイヤ、オールシーズンタイヤとして好適である。
ゴム成分として2種以上のゴムを用いる場合には、混合後のゴム成分のTgが上記範囲内であれば良い。
なお、ゴム成分のTgは、従来公知の方法により測定することができる。例えば、ゴム成分のTgは、示差熱分析(DTA)や示差走査熱量測定(DSC)により測定することができる。
ゴム組成物に用いるゴム用添加剤は、下記の含硫黄炭化水素重合体を含む。上記のガラス転移温度が高いゴム成分に、従来公知の石油樹脂のようなゴム成分のガラス転移温度を上げる添加剤を配合した場合には、得られたゴム組成物を用いて製造したタイヤの耐摩耗性は悪化する。一方、本発明においては、上記のガラス転移温度が高いゴム成分に、下記の含硫黄炭化水素重合体を含むゴム用添加剤を配合することで、得られたゴム組成物を用いて製造したタイヤの耐摩耗性を向上することができる。そのため、下記の含硫黄炭化水素重合体は、タイヤの耐摩耗性向上剤として用いることができる。
含硫黄炭化水素重合体は、不飽和炭化水素の重合体と硫黄との反応生成物である。具体的には、含硫黄炭化水素重合体は、不飽和炭化水素の重合体の不飽和結合に硫黄を反応させて得た反応生成物であることが好ましい。
また、含硫黄炭化水素重合体の分子量分布(Mw/数平均分子量(Mn))は、好ましくは1.0以上5.0以下であり、より好ましくは1.0以上4.0以下であり、さらに好ましくは1.0以上3.0以下であり、さらにより好ましくは1.0以上2.5以下である。
なお、重量平均分子量(Mw)および分子量分布(Mw/Mn)は、従来公知のGPC(ゲルパーミエーションクロマトグラフィー)解析の方法によって測定することができる。
含硫黄炭化水素重合体は、不飽和炭化水素を無溶媒下で加熱しながら溶融状態で硫黄と反応させることにより製造することができる。加熱反応を溶媒中ではなく無溶媒下で行うことで、含硫黄炭化水素重合体の重量平均分子量を小さくしながら、分子量のばらつきを小さくすることができる。また、加熱反応の条件は、特に限定されず適宜設定することができるが、好ましくは90~160℃で、より好ましくは100~150℃で、さらに好ましくは100~140℃で、反応時間は好ましくは0.5~10時間、より好ましくは1~8時間である。なお、加熱反応の条件を調節することで、含硫黄炭化水素重合体の重量平均分子量を調節することができる。
充填剤としては、シリカ、カーボンブラック、および硫酸バリウム等が挙げられ、シリカおよびカーボンブラックの少なくとも1種を用いることが好ましく、シリカを用いることがより好ましい。
シリカとしては、特に限定されないが、例えば、乾式法シリカ、湿式法シリカ、コロイダルシリカ、および沈降シリカ等が挙げられる。これらの中でも、含水ケイ酸を主成分とする湿式法シリカが好ましい。これらのシリカは、それぞれ単独でまたは2種以上を組み合わせて用いることができる。
シリカを配合する場合には、シランカップリング剤を配合することが好ましい。シランカップリング剤としては、公知のシランカップリング剤を用いることができる。例えば、ビス[3-(トリエトキシシリル)プロピル]テトラスルフィド、ビス[3-(トリエトキシシリル)プロピル]ジスルフィド、3-オクタノイルチオ-1-プロピルトリエトキシシラン(3-octanoylthio-1-propyltriethoxysilane))およびその単独縮合物もしくは3-メルカプトプロピルトリエトキシシランとの共縮合物が挙げられる。ビス[3-(トリエトキシシリル)プロピル]テトラスルフィドは、市販されているものを使用してもよく、例えば、エボニック社製のSi-69が挙げられる。また、ビス[3-(トリエトキシシリル)プロピル]ジスルフィドについても、市販されているものを使用してもよく、例えば、エボニック社製のSi-75が挙げられる。また、3-オクタノイルチオ-1-プロピルトリエトキシシラン(3-octanoylthio-1-propyltriethoxysilane))は、市販されているものを使用してもよく、例えば、モメンティブ社製のNXT-シランが挙げられる。また、3-オクタノイルチオ-1-プロピルトリエトキシシラン(3-octanoylthio-1-propyltriethoxysilane))の縮合物は、市販されているものを使用してもよく、例えば、モメンティブ社製のNXT-Z45シランが挙げられる。シランカップリング剤の含有量は、シリカ量の1~20質量%が好ましく、2~10質量%がより好ましい。
本発明のゴム組成物は、その機能を損なわない範囲で、加硫剤、加硫促進剤、加硫促進助剤、老化防止剤、軟化剤、酸化防止剤、及び着色剤等のその他の加工助剤を含んでいてもよい。
本発明のゴム組成物の製造方法は、少なくとも上記のゴム成分と上記のゴム用添加剤とを混練する工程を含んでなる。ゴム組成物の製造方法は、好ましくは、さらに上記の加硫剤を混練する工程を含んでなるものであってもよい。より好ましくは、さらに該加硫剤と上記の加硫促進剤を混練する工程を含んでなるものであってもよい。
本発明のゴム組成物を用いて、従来公知の方法および当業者に広く知られた技術常識によりタイヤ製品を製造することができる。タイヤ製品としては、タイヤやその他の関連部材が挙げられる。例えば、ゴム組成物を押し出し、次いで、タイヤ成型機を用いて成形した後、加硫機を用いて加熱、加圧することにより架橋が形成され、タイヤを製造することができる。本発明のゴム組成物を用いて製造したタイヤは耐摩耗性、ウェットグリップ性、および操縦安定性に優れる。
本発明のゴム組成物を用いて、タイヤ製品以外のゴム製品を製造することもできる。タイヤ以外のゴム製品としては、自動車用ゴム部品(外装、内装、ウェザーストリップ類、ブーツ類、マウント類、シール類、シーラー類、ガスケット類)、ホース、ベルト、シート、防振ゴム、ローラー、ライニング、ゴム引布、シール材、手袋、防舷材、医療用ゴム(シリンジガスケット、チューブ、カテーテル)、ガスケット(家電用、建築用)、アスファルト改質剤、グリップ類、玩具、靴、サンダル、キーパッド、ギア、ペットボトルキャプライナー等が挙げられる。
・含硫黄炭化水素重合体Aの合成
300ml二口ナスフラスコに、石油樹脂A(Mw:810、Mw/Mn:1.74、軟化点85℃、ヨウ素価(JIS K0070準拠):185.0、DCPD含有不飽和炭化水素の重合体)90gを入れて、130℃に加熱し、溶融状態とした。次に、フラスコ内に硫黄8.7gを入れて、3時間撹拌した。反応完了後、反応物をアルミ皿に流し出し自然放冷した。
・含硫黄炭化水素重合体Bの合成
上記の含硫黄炭化水素重合体Aの合成において、加熱温度を120℃に変更し、撹拌時間を1時間に変更した以外は同様にして、反応を行った。
・含硫黄炭化水素重合体Cの合成
上記の含硫黄炭化水素重合体Aの合成において、加熱温度を120℃に変更し、撹拌時間を6時間に変更した以外は同様にして、反応を行った。
・含硫黄炭化水素重合体Dの合成
上記の含硫黄炭化水素重合体Aの合成において、撹拌時間を5時間に変更した以外は同様にして、反応を行った。
・炭化水素重合体Eの合成
ナフサクラッカーから得られるC5留分およびC9留分を原料モノマーとして、酸触媒による重合工程、残触媒の中和工程、軽質分の除去工程を経て、芳香族分12%、軟化点90℃、Mw1300の石油樹脂を得た。
以下の各成分を、250mLニーダー(東洋精機社製ラボプラストミル)を用いて混練し、ゴム組成物を得た。実施した混練操作の詳細は以下の(i)~(iii)の通りである。
(i)ミキサー混練:130℃に加熱した密閉式加圧ニーダーへゴム成分を投入し、30rpmで1分間素練りを行った後、シリカ、酸化亜鉛、ステアリン酸、および老化防止剤の混合物の1/2量を測り取ったものと、シランカップリング剤1の全量および含硫黄炭化水素重合体Aの全量を投入し、50rpmに回転数を上げて1分30秒間混練を行った。さらに残りの1/2量の前記シリカ、酸化亜鉛、ステアリン酸、および老化防止剤の混合物を加えて、5分30秒間混練を行い、放出した。
(ii)リミル:シリカの分散をよくするために、120℃に加熱した密閉式加圧ニーダーへ放出して十分温度が下がった混練物を、さらに50rpmで2分間混練を行った後、放出した。
(iii)ロール混練(加硫系添加):放出して十分温度が下がった後、2本ロールで上述の混練物に硫黄、加硫促進剤等を加え、混練し、ゴム組成物を得た。
・ゴム(SBR(A)、Tg:-27℃) 100質量部
・シリカAQ(東ソー社製、商品名:ニップシールAQ) 70質量部
・酸化亜鉛3号(東邦亜鉛社製、商品名:銀嶺R) 3質量部
・ステアリン酸(新日本理化製、商品名:ステアリン酸300) 1質量部
・老化防止剤(大内新興化学社製、商品名:ノクラック6C) 1質量部
・シランカップリング剤1(エボニック社製、商品名:Si69)
5.6質量部
・含硫黄炭化水素重合体A 15質量部
・硫黄(細井化学社製、5%油処理硫黄) 1質量部
・加硫促進剤(大内新興化学社製、商品名:ノクセラーCZ)2.3質量部
・加硫促進剤(大内新興化学社製、商品名:ノクセラーD) 1質量部
含硫黄炭化水素重合体Aの代わりに炭化水素重合体E(硫黄非含有)15質量部を添加し、硫黄の添加量を1.5質量部に変更した以外は実施例1と同様にして、ゴム組成物を得た。
シランカップリング剤1(Si69)の代わりにシランカップリング剤2(エボニック社製、商品名:Si-75)5.6質量部を添加した以外は実施例1と同様にして、ゴム組成物を得た。
シランカップリング剤1(Si69)の代わりにシランカップリング剤3(エボニック社製、商品名:Si-363)5.6質量部を添加した以外は実施例1と同様にして、ゴム組成物を得た。
シランカップリング剤1(Si69)の代わりにシランカップリング剤4(モメンティブ社製、商品名:NXT-シラン)5.6質量部を添加した以外は実施例1と同様にして、ゴム組成物を得た。
シランカップリング剤1(Si69)の代わりにシランカップリング剤5(モメンティブ社製、商品名:NXT-Z45シラン)5.6質量部を添加した以外は実施例1と同様にして、ゴム組成物を得た。
シリカの添加量を40質量部に変更した以外は実施例1と同様にして、ゴム組成物を得た。
含硫黄炭化水素重合体Aの代わりに炭化水素重合体E15質量部を添加し、硫黄の添加量を1.5質量部に変更した以外は実施例6と同様にして、ゴム組成物を得た。
シリカの添加量を150質量部に変更した以外は実施例1と同様にして、ゴム組成物を得た。
含硫黄炭化水素重合体Aの代わりに炭化水素重合体E15質量部を添加し、硫黄の添加量を1.5質量部に変更した以外は実施例7と同様にして、ゴム組成物を得た。
ゴム成分としてSBR(A)(Tg:-27℃)の添加量を70質量部に変更し、BR(Tg:-100℃)30質量部を添加した以外は実施例1と同様にして、ゴム組成物を得た。
含硫黄炭化水素重合体Aの代わりに炭化水素重合体E15質量部を添加し、硫黄の添加量を1.5質量部に変更した以外は実施例8と同様にして、ゴム組成物を得た。
ゴム成分としてSBR(A)(Tg:-27℃)の添加量を60質量部に変更し、BR(Tg:-100℃)20質量部およびNR(Tg:-79℃)20質量部を添加した以外は実施例1と同様にして、ゴム組成物を得た。
含硫黄炭化水素重合体Aの代わりに炭化水素重合体E15質量部を添加し、硫黄の添加量を1.5質量部に変更した以外は実施例9と同様にして、ゴム組成物を得た。
ゴム成分としてSBR(A)(Tg:-27℃)の添加量を60質量部に変更し、BR(Tg:-100℃)40質量部を添加した以外は実施例1と同様にして、ゴム組成物を得た。
含硫黄炭化水素重合体Aの代わりに炭化水素重合体E15質量部を添加し、硫黄の添加量を1.5質量部に変更した以外は実施例10と同様にして、ゴム組成物を得た。
ゴム成分としてSBR(A)の代わりにSBR(B)(Tg:-64℃)を100質量部添加した以外は比較例1と同様にして、ゴム組成物を得た。
炭化水素重合体Eの代わりに含硫黄炭化水素重合体A15質量部を添加し、硫黄の添加量を1質量部に変更した以外は比較例7と同様にして、ゴム組成物を得た。
ゴム成分としてSBR(A)の代わりにNR(Tg:-79℃)100質量部を添加し、硫黄の添加量を2.5質量部に変更し、加硫促進剤(ノクセラーCZ)の添加量を2質量部に変更し、加硫促進剤(ノクセラーD)の添加量を1.5質量部に変更した以外は比較例1と同様にして、ゴム組成物を得た。
炭化水素重合体Eの代わりに含硫黄炭化水素重合体A15質量部を添加し、硫黄の添加量を2質量部に変更した以外は比較例9と同様にして、ゴム組成物を得た。
実施例1~10および比較例1~10で得られたゴム組成物を用いて、下記の測定を行った。なお、各ゴム成分のTgは、示差走査熱量測定装置(DSC、日立ハイテクサイエンス製、型番:DSC7000X)を用いて、サンプル量:約10mg、流通条件:窒素ガス40ml/分、昇温速度:20℃/分の条件で測定した値である。
各ゴム組成物42gを金型(150mm×150mm×1mm)に入れて、160℃、20MPaの条件で、40分間加熱加圧して、1mm厚のゴムシート(厚さ1mm、縦150mm、横150mm)を得た。各ゴムシートから3号ダンベル状の試験片を打ち抜き、引張速度500mm/分での引張試験をJIS K6251(2010年発行)に準拠して行い、100%モジュラス[MPa]を室温(25℃)にて測定した。なお、各実施例および各比較例では、各ゴムシートの架橋密度の指標である100%モジュラスの値を概ね近い値になるように調節した上で他の物性を確認した。
各ゴム組成物15gを、直径16.0mm、厚さ8mmの円盤状の試料となるようにそれぞれ成型した。次に、得られた円盤状の試料をそれぞれ用いて、JIS K6264-2(2005年発行)に準拠して、DIN摩耗試験機(回転円筒型摩耗試験機:安田精機社製の商品名「DIN摩耗試験機」)を用いて、温度:室温(25℃)、荷重:2.5N、ドラム回転速度:40rpm、試料横送り速度:2.8mm/secの条件で耐摩耗試験を行って、摩耗量(体積基準:摩耗前の総体積に対する試験により摩耗した体積の割合(体積%))を測定した。なお、摩耗量が少ない方が、耐摩耗性に優れることを示す。
上記で得られた各ゴムシートについて、デュロメータ(東洋精機製作所社製、型番:GS-610)を用いてJIS K6253に準拠して、温度25℃におけるISO規定のタイプAのゴム硬度を測定した。硬度の値が大きい方が、硬いことを意味する。なお、各実施例および各比較例では、各ゴムシートの硬度を概ね近い値になるように調節した上で他の物性を確認した。
上記で得られた各ゴムシートについて、粘弾性測定装置(UBM社製REOGEL E-4000)を用い、JIS K 6394に準拠して、引張モードで、歪約0.1%、周波数10Hzの条件下において、測定温度0℃におけるtanδを測定した。tanδ(0℃)の値が高い方がウェットグリップ性に優れることを示す。
上記で得られた各ゴムシートについて、JIS K6394:2007に準じて、粘弾性測定装置(UBM社製REOGEL E-4000)を用いて、引張モードで、歪約0.1%、周波数10Hzの条件下において、温度30℃の条件で、E’(30℃)を測定した。E’(30℃)の値が高い方が、操縦安定性に優れることを示す。
実施例8および比較例4の結果から、ガラス転移温度が-49℃のゴム成分に対して硫黄非含有の炭化水素重合体Eの代わりに含硫黄炭化水素重合体Aを添加することで、得られたゴムシートは、耐摩耗性、ウェットグリップ性、および操縦安定性が非常に優れていた。
実施例9および比較例5の結果から、ガラス転移温度が-50℃のゴム成分に対して硫黄非含有の炭化水素重合体Eの代わりに含硫黄炭化水素重合体Aを添加することで、得られたゴムシートは、耐摩耗性、ウェットグリップ性、および操縦安定性が優れていた。
実施例10および比較例6の結果から、ガラス転移温度が-56℃のゴム成分に対して硫黄非含有の炭化水素重合体Eの代わりに含硫黄炭化水素重合体Aを添加することで、得られたゴムシートは、耐摩耗性、ウェットグリップ性、および操縦安定性が優れていた。
比較例7および比較例8の結果から、ガラス転移温度が-64℃のゴム成分に対して硫黄非含有の炭化水素重合体Eの代わりに含硫黄炭化水素重合体Aを添加したところ、得られたゴムシートは耐摩耗性、ウェットグリップ性、および操縦安定性が改善しなかった。
比較例9および比較例10の結果から、ガラス転移温度が-70℃のゴム成分に対して硫黄非含有の炭化水素重合体Eの代わりに含硫黄炭化水素重合体Aを添加したところ、得られたゴムシートは耐摩耗性、ウェットグリップ性、および操縦安定性が改善しなかった。
よって、本発明のゴム組成物を用いることで、耐摩耗性、ウェットグリップ性、および操縦安定性に優れたタイヤを製造できることが判明した。
含硫黄炭化水素重合体Aの代わりに含硫黄炭化水素重合体B15質量部を添加した以外は実施例8と同様にして、ゴム組成物を得た。
含硫黄炭化水素重合体Aの代わりに含硫黄炭化水素重合体C15質量部を添加した以外は実施例8と同様にして、ゴム組成物を得た。
含硫黄炭化水素重合体Aの代わりに含硫黄炭化水素重合体D15質量部を添加した以外は実施例8と同様にして、ゴム組成物を得た。
実施例11~13で得られたゴム組成物を用いて、上記と同様にして引張強度および摩耗量の測定を行った。測定結果を表3に表す。なお、耐摩耗性、ウェットグリップ性、および操縦安定性の各結果について、実施例11~13は比較例4における各値を100とした場合の相対値として記載した。
Claims (15)
- ガラス転移温度が-60℃以上であるゴム成分と、
含硫黄炭化水素重合体を含むゴム用添加剤と、
を含み、
前記含硫黄炭化水素重合体が、不飽和炭化水素の重合体と硫黄との反応生成物であり、前記不飽和炭化水素が脂環式不飽和化合物を含み、
前記含硫黄炭化水素重合体の重量平均分子量が500以上4000以下である、ゴム組成物。 - 前記脂環式不飽和炭化水素が、ノルボルネン骨格を有する化合物を含む、請求項1に記載のゴム組成物。
- 前記ノルボルネン骨格を有する化合物が、ジシクロペンタジエンを含む、請求項2に記載のゴム組成物。
- 前記ノルボルネン骨格中の不飽和結合が硫黄と反応してなる、請求項2に記載のゴム組成物。
- 前記ゴム成分のガラス転移温度が-50℃以上-10℃以下である、請求項1に記載のゴム組成物。
- 前記含硫黄炭化水素重合体の重量平均分子量が700以上2000以下である、請求項1に記載のゴム組成物。
- 前記ゴム成分が、芳香族ビニル-共役ジエン共重合体ゴムおよび共役ジエン(共)重合体ゴムからなる群から選択される少なくとも1種を含み、請求項1に記載のゴム組成物。
- 前記ゴム成分が、スチレン-ブタジエンゴム、ブタジエンゴム、天然ゴム、およびイソプレンゴムからなる群から選択される少なくとも1種を含む、請求項1に記載のゴム組成物。
- 充填剤をさらに含む、請求項1に記載のゴム組成物。
- 前記充填剤が、シリカおよびカーボンブラックからなる群から選択される少なくとも1種を含む、請求項9に記載のゴム組成物。
- 前記充填剤の含有量は、前記ゴム成分100質量部に対して10質量部以上200質量部未満である、請求項9に記載のゴム組成物。
- 前記ゴム用添加剤が、タイヤの耐摩耗性向上剤である、請求項1~11のいずれか一項に記載のゴム組成物。
- タイヤ製品用である、請求項1~11のいずれか一項に記載のゴム組成物。
- 少なくともゴム成分とゴム用添加剤とを混練する工程を含む、ゴム組成物の製造方法であって、
前記ゴム成分のガラス転移温度が-60℃以上であり、
前記ゴム用添加剤が、含硫黄炭化水素重合体を含み、
前記含硫黄炭化水素重合体が、不飽和炭化水素の重合体と硫黄との反応生成物であり、前記不飽和炭化水素が脂環式不飽和化合物を含み、
前記含硫黄炭化水素重合体の重量平均分子量が500以上4000以下である、ゴム組成物の製造方法。 - 請求項1~11のいずれか一項に記載のゴム組成物を用いて製造されたタイヤ製品。
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WO2024038878A1 (ja) * | 2022-08-17 | 2024-02-22 | Eneos株式会社 | ゴム組成物およびその製造方法ならびにタイヤ製品 |
WO2024038877A1 (ja) * | 2022-08-17 | 2024-02-22 | Eneos株式会社 | ゴム組成物およびその製造方法ならびにタイヤ製品 |
WO2024038880A1 (ja) * | 2022-08-17 | 2024-02-22 | Eneos株式会社 | ゴム組成物およびその製造方法ならびにタイヤ製品 |
WO2024038876A1 (ja) * | 2022-08-17 | 2024-02-22 | Eneos株式会社 | ゴム組成物およびその製造方法ならびにタイヤ製品 |
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