WO2013132905A1 - 水添分枝共役ジエン共重合体、ゴム組成物および空気入りタイヤ - Google Patents
水添分枝共役ジエン共重合体、ゴム組成物および空気入りタイヤ Download PDFInfo
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- WO2013132905A1 WO2013132905A1 PCT/JP2013/051189 JP2013051189W WO2013132905A1 WO 2013132905 A1 WO2013132905 A1 WO 2013132905A1 JP 2013051189 W JP2013051189 W JP 2013051189W WO 2013132905 A1 WO2013132905 A1 WO 2013132905A1
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- conjugated diene
- branched conjugated
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- compound
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- KZAORBYGVQCRQZ-UHFFFAOYSA-N triethoxy-[4-(4-triethoxysilylbutyltrisulfanyl)butyl]silane Chemical compound CCO[Si](OCC)(OCC)CCCCSSSCCCC[Si](OCC)(OCC)OCC KZAORBYGVQCRQZ-UHFFFAOYSA-N 0.000 description 1
- VOITXYVAKOUIBA-UHFFFAOYSA-N triethylaluminium Chemical compound CC[Al](CC)CC VOITXYVAKOUIBA-UHFFFAOYSA-N 0.000 description 1
- MCULRUJILOGHCJ-UHFFFAOYSA-N triisobutylaluminium Chemical compound CC(C)C[Al](CC(C)C)CC(C)C MCULRUJILOGHCJ-UHFFFAOYSA-N 0.000 description 1
- QPPXVBLDIDEHBA-UHFFFAOYSA-N trimethoxy(3-nitropropyl)silane Chemical compound CO[Si](OC)(OC)CCC[N+]([O-])=O QPPXVBLDIDEHBA-UHFFFAOYSA-N 0.000 description 1
- JQBSHJQOBJRYIX-UHFFFAOYSA-N trimethoxy-[2-(2-trimethoxysilylethyldisulfanyl)ethyl]silane Chemical compound CO[Si](OC)(OC)CCSSCC[Si](OC)(OC)OC JQBSHJQOBJRYIX-UHFFFAOYSA-N 0.000 description 1
- JSXKIRYGYMKWSK-UHFFFAOYSA-N trimethoxy-[2-(2-trimethoxysilylethyltetrasulfanyl)ethyl]silane Chemical compound CO[Si](OC)(OC)CCSSSSCC[Si](OC)(OC)OC JSXKIRYGYMKWSK-UHFFFAOYSA-N 0.000 description 1
- NQRACKNXKKOCJY-UHFFFAOYSA-N trimethoxy-[3-(3-trimethoxysilylpropyldisulfanyl)propyl]silane Chemical compound CO[Si](OC)(OC)CCCSSCCC[Si](OC)(OC)OC NQRACKNXKKOCJY-UHFFFAOYSA-N 0.000 description 1
- JTTSZDBCLAKKAY-UHFFFAOYSA-N trimethoxy-[3-(3-trimethoxysilylpropyltetrasulfanyl)propyl]silane Chemical compound CO[Si](OC)(OC)CCCSSSSCCC[Si](OC)(OC)OC JTTSZDBCLAKKAY-UHFFFAOYSA-N 0.000 description 1
- KOFGNZOFJYBHIN-UHFFFAOYSA-N trimethoxy-[3-(3-trimethoxysilylpropyltrisulfanyl)propyl]silane Chemical compound CO[Si](OC)(OC)CCCSSSCCC[Si](OC)(OC)OC KOFGNZOFJYBHIN-UHFFFAOYSA-N 0.000 description 1
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 description 1
- BNBXBRPOAJZBNB-UHFFFAOYSA-N trimethoxy-[4-(4-trimethoxysilylbutyldisulfanyl)butyl]silane Chemical compound CO[Si](OC)(OC)CCCCSSCCCC[Si](OC)(OC)OC BNBXBRPOAJZBNB-UHFFFAOYSA-N 0.000 description 1
- WUMASLCNJBRHDA-UHFFFAOYSA-N trimethoxy-[4-(4-trimethoxysilylbutyltetrasulfanyl)butyl]silane Chemical compound CO[Si](OC)(OC)CCCCSSSSCCCC[Si](OC)(OC)OC WUMASLCNJBRHDA-UHFFFAOYSA-N 0.000 description 1
- GSZUEPNJCPXEGU-UHFFFAOYSA-N trimethoxy-[4-(4-trimethoxysilylbutyltrisulfanyl)butyl]silane Chemical compound CO[Si](OC)(OC)CCCCSSSCCCC[Si](OC)(OC)OC GSZUEPNJCPXEGU-UHFFFAOYSA-N 0.000 description 1
- JLTRXTDYQLMHGR-UHFFFAOYSA-N trimethylaluminium Chemical compound C[Al](C)C JLTRXTDYQLMHGR-UHFFFAOYSA-N 0.000 description 1
- YFTHZRPMJXBUME-UHFFFAOYSA-N tripropylamine Chemical compound CCCN(CCC)CCC YFTHZRPMJXBUME-UHFFFAOYSA-N 0.000 description 1
- 125000002948 undecyl 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])C([H])([H])C([H])([H])C([H])([H])[H] 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
- 239000008096 xylene Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc 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
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F36/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds
- C08F36/22—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having three or more carbon-to-carbon double bonds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08C—TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
- C08C19/00—Chemical modification of rubber
- C08C19/02—Hydrogenation
-
- 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
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F236/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds
- C08F236/02—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds
- C08F236/04—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated
- C08F236/10—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated with vinyl-aromatic monomers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F236/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds
- C08F236/22—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having three or more carbon-to-carbon double bonds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F36/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds
- C08F36/02—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds
- C08F36/04—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated
- C08F36/06—Butadiene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F36/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds
- C08F36/02—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds
- C08F36/04—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated
- C08F36/08—Isoprene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L47/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds; Compositions of derivatives of such polymers
Definitions
- the present invention relates to a hydrogenated branched conjugated diene copolymer, a rubber composition comprising the copolymer, and a pneumatic tire produced using the rubber composition.
- the present invention also relates to a branched conjugated diene copolymer, a rubber composition comprising the copolymer, and a pneumatic tire produced using the rubber composition.
- High-performance tire treads are generally required to have both high grip performance and wear resistance.
- a rubber composition exhibiting high grip performance for example, a rubber composition using a styrene-butadiene copolymer rubber (SBR) having a high glass transition temperature (Tg) as a rubber component
- SBR styrene-butadiene copolymer rubber
- Tg glass transition temperature
- Equal amount substitution with point resin, rubber composition filled with rubber component, rubber composition highly filled with softener or carbon black, rubber composition using carbon black with small particle diameter, or SBR, high softening A rubber composition in which a point resin, the softener, or carbon black is combined is known.
- the rubber composition using SBR having a high Tg has a problem that the temperature dependency becomes large and the performance change with respect to the temperature change becomes large. Further, when the process oil is replaced with an equal amount of the high softening point resin, if the replacement amount is large, there is a problem that the temperature dependency becomes large due to the influence of the high softening point resin. Further, when carbon black having a small particle diameter or a large amount of softening agent is used, there is a problem that the dispersibility of carbon black is poor and wear resistance is lowered.
- Patent Document 1 a rubber composition using a low molecular weight styrene-butadiene copolymer has been proposed (see Patent Document 1).
- a part of the low molecular weight component forms a cross-link with the rubber component of the matrix and is taken into the matrix and the hysteresis cannot be sufficiently suppressed.
- the compatibility with the matrix is significantly reduced. There are problems such as coming.
- Myrcene is a naturally occurring organic compound and is a kind of olefin belonging to monoterpene. Myrcene has two isomers, ⁇ -myrcene (2-methyl-6-methyleneocta-1,7-diene) and ⁇ -myrcene (7-methyl-3-methyleneocta-1,6-diene).
- Patent Document 2 discloses a myrcene polymer.
- Farnesene is a kind of isoprenoid compound that is chemically synthesized by oligomerization of isoprene or dehydration reaction of nerolidol, and is mainly used as a fragrance or a raw material thereof (Patent Document 3).
- the present invention is a novel branched conjugated diene copolymer useful for improving processability as a component of a rubber composition for tires, and particularly exhibits both wear resistance and grip performance while exhibiting excellent properties in processability.
- Novel hydrogenated branched conjugated diene copolymer useful as a component of a tire rubber composition which is improved to a high level and further suppresses bleeding, and a tire rubber composition comprising the copolymer And a pneumatic tire produced by using the rubber composition for a tire.
- the present invention provides a novel branched conjugated diene copolymer useful for improving processability as a component of a tire rubber composition, a tire rubber composition comprising the branched conjugated diene copolymer, especially , A rubber composition for tires that improves both wear resistance and grip performance to a high level and also exhibits excellent properties in processability, and a pneumatic tire manufactured using the rubber composition for tires Is to provide.
- the present invention relates to the general formula (1)
- R 1 represents an aliphatic hydrocarbon having 6 to 11 carbon atoms.
- a conjugated diene compound represented by the general formula (3) (Wherein R 4 represents a hydrogen atom, an aliphatic hydrocarbon group having 1 to 3 carbon atoms, an alicyclic hydrocarbon group having 3 to 8 carbon atoms, or an aromatic hydrocarbon group having 6 to 10 carbon atoms).
- Copolymerization ratio (1) of branched conjugated diene compound (1) is 1 to 99% by weight
- copolymerization ratio (m) of conjugated diene compound (2) is 99 to 0% by weight
- the present invention relates to a hydrogenated branched conjugated diene copolymer having a ratio (n) of 99 to 0% by weight.
- the hydrogenated branched conjugated diene copolymer is blended with a rubber composition in comparison with a polymer having the same weight average molecular weight in which the branched conjugated diene compound (1) is replaced with the conjugated diene compound (2).
- the rubber composition having a Mooney viscosity ML 1 + 4 (130 ° C.) of a low value is preferably used for improving processability.
- the hydrogenated branched conjugated diene copolymer preferably has a weight average molecular weight of 2000 to 200,000.
- the hydrogenated branched conjugated diene copolymer preferably has a hydrogenation rate of 10 to 90%.
- the hydrogenated branched conjugated diene copolymer preferably has a copolymerization ratio (n) of the vinyl compound (3) of 40% by weight or more.
- the branched conjugated diene compound (1) is preferably myrcene and / or farnesene.
- the hydrogenated branched conjugated diene copolymer is preferably such that the conjugated diene compound (2) is 1,3-butadiene and / or isoprene.
- the vinyl compound (3) is one or more selected from the group consisting of styrene, ⁇ -methylstyrene, ⁇ -vinylnaphthalene and ⁇ -vinylnaphthalene. Those are preferred.
- the present invention also relates to a rubber composition comprising the hydrogenated branched conjugated diene copolymer.
- this invention relates to the pneumatic tire produced using the said rubber composition.
- the present invention provides a general formula (1) (The symbols have the same meaning as above.)
- a branched conjugated diene copolymer obtained by copolymerization with a vinyl compound represented by The present invention relates to a branched conjugated diene copolymer in which the copolymerization ratio (1) of the branched conjugated diene compound (1) is 1 to 99% by weight and the copolymerization ratio (n) of the vinyl compound (3) is 99 to 1% by weight. .
- the copolymerization ratio (l) of the branched conjugated diene compound (1) is preferably 2.5 to 75% by weight, and the copolymerization ratio (n ) Is preferably 97.5 to 25% by weight.
- the branched conjugated diene copolymer has a Mooney viscosity ML 1 + 4 (130 ° C. ) Is preferably low.
- the branched conjugated diene compound (1) is preferably myrcene and / or farnesene.
- the vinyl compound (3) is preferably one or more selected from the group consisting of styrene, ⁇ -methylstyrene, ⁇ -vinylnaphthalene and ⁇ -vinylnaphthalene.
- the present invention also relates to a rubber composition comprising the branched conjugated diene copolymer.
- this invention relates to the pneumatic tire produced using the said rubber composition.
- a novel branched conjugated diene copolymer useful for improving processability, in particular, while exhibiting excellent properties in improving processability, wear resistance and A novel hydrogenated branched conjugated diene copolymer useful as a component of a rubber composition for tires, which can improve the grip performance to a high level and suppress the occurrence of bleed, including the copolymer A tire rubber composition can be provided.
- Such a rubber composition for tires of the present invention is useful as a rubber for tire treads and the like, and particularly useful as a rubber composition for tire treads for competition (race etc.).
- the pneumatic tire produced using this rubber composition for tires can be provided.
- a hydrogenated branched conjugated diene copolymer having a low molecular weight has good compatibility with the rubber component and suppresses the occurrence of bleeding. Therefore, even when the styrene content is high (for example, the styrene content in the copolymer is 40% by weight or more), by using the branched conjugated diene compound (1) as the conjugated diene compound, In addition, it is possible to prevent the deterioration of the handling performance due to the rubber being too hard.
- a novel branched conjugated diene copolymer useful for improving processability can be provided as a component of a tire rubber composition, and the branched conjugated diene copolymer can be provided.
- the coalescence it is possible to provide a rubber composition for a tire that improves both the wear resistance and the grip performance to a high level and is excellent in processability.
- Such a rubber composition for tires of the present invention includes various rubbers for tire treads, side rubbers, rubbers for case members, etc., such as ordinary passenger cars, truck buses, light trucks, small trucks, motorcycles, motorbikes, and industrial vehicles. Although useful as a composition, it is particularly useful as a rubber composition for tire treads.
- the hydrogenated branched conjugated diene copolymer of the present invention is obtained by copolymerizing a branched conjugated diene compound (1) with a conjugated diene compound (2) and / or a vinyl compound (3). Is obtained by hydrogenation.
- the weight average molecular weight (Mw) of the hydrogenated branched conjugated diene copolymer of the present invention is not particularly limited as long as it is 1000 or more, and preferably 2000 or more. If Mw is less than 1000, it tends to be a liquid polymer with high fluidity. On the other hand, Mw is not particularly limited as long as it is 3 million or less. When Mw exceeds 3 million, it tends to be a solid having no rubber elasticity.
- Mw is preferably 3000 or more, and more preferably 5000 or more. If Mw is less than 3000, sufficient wear resistance tends not to be obtained. On the other hand, Mw is preferably 200,000 or less, and more preferably 100,000 or less. When Mw exceeds 200,000, there is a tendency that sufficient grip performance cannot be obtained.
- the number average molecular weight (Mn) of the hydrogenated branched conjugated diene copolymer is preferably 3000 or more, more preferably 250,000 or more. This is because the rubber composition tends not to have a problem that the altitude of the rubber composition increases and the processability deteriorates.
- Mn is preferably 3 million or less, more preferably 2 million or less. When Mn exceeds 3 million, it tends to be a solid having no rubber elasticity.
- the preferable range of Mw / Mn is 20.0 or less, more preferably 10.0 or less.
- Mw / Mn is more than 20.0, there is a tendency that the processability is not deteriorated due to a decrease in the hardness of the rubber composition.
- the lower limit value of Mw / Mn is not particularly limited, and there is no particular problem at 1.0 or more.
- the hydrogenation rate is not particularly limited as long as it does not cause bleeding when the hydrogenated branched conjugated diene copolymer is blended with other rubber components.
- Examples of the range of such a hydrogenation rate include 10% to 90%, preferably 30% to 70%.
- the glass transition temperature (Tg) of the hydrogenated branched conjugated diene copolymer is usually in the range of ⁇ 80 ° C. to 110 ° C.
- the Tg is preferably, for example, ⁇ 70 ° C. to 70 ° C., more preferably ⁇ 30 ° C. to 30 ° C.
- the Mooney viscosity ML 1 + 4 (130 ° C.) of the hydrogenated branched conjugated diene copolymer is the same molecular weight when the branched conjugated diene compound (1) constituting the copolymer is replaced with 1,3-butadiene. As long as it shows a low value in comparison with the polymer, the effect of the present invention of improving the workability can be obtained, so there is no particular limitation, but generally it is preferably 25 or more, more preferably 30 or more. If the Mooney viscosity is less than 25, it tends to have fluidity. On the other hand, the Mooney viscosity is preferably 160 or less, more preferably 150 or less, still more preferably 100 or less, and still more preferably 60 or less. If the Mooney viscosity is more than 160, a large amount of softening agent or processing aid tends to be required during processing.
- the Mooney viscosity can also be compared as the Mooney viscosity of the rubber composition by blending a hydrogenated branched conjugated diene copolymer with the rubber composition. That is, the hydrogenated branched conjugated diene copolymer is compounded in a rubber composition in comparison with a polymer having the same weight average molecular weight obtained by replacing the branched conjugated diene compound (1) with the conjugated diene compound (2).
- the Mooney viscosity ML 1 + 4 (130 ° C.) of the rubber composition at this time shows a low value.
- the preferred Mooney viscosity in this case is the same as that for the copolymer.
- the copolymerization ratio (l) of the branched conjugated diene compound (1) is not particularly limited as long as it is 1 to 99% by weight, but the lower limit is preferably 2.5% by weight or more, and more preferably 5% or more. preferable. If it is less than 1%, the effect of blending the branched conjugated diene compound (1) to improve processability tends to be insufficient.
- the upper limit is preferably 75% by weight or less, more preferably 60% by weight or less, further preferably 50% by weight or less, and further preferably 15% by weight or less. If it exceeds 99% by weight, it tends to be a fluid polymer, and the effect on the processability of the branched conjugated diene compound (1) tends to be sufficiently exerted if it is added at 15% by weight. .
- the lower limit of the preferable range of the polymerization ratio (m) of the conjugated diene compound (2) is 1% by weight or more, preferably 30% by weight or more, more preferably 50% by weight or more. If m is less than 1% by weight, it tends to be a fluid polymer.
- the upper limit is 99% by weight or less, more preferably 80% by weight or less, further preferably 72.5% by weight or less, and further preferably 55% by weight or less. If m exceeds 99% by weight, the effect of copolymerizing the branched conjugated diene compound (1) tends to be small for improving processability.
- the lower limit of the preferable range of the polymerization ratio (n) of the vinyl compound (3) is 10% by weight or more, more preferably 25% by weight or more, and further preferably 40% by weight or more.
- n is less than 10% by weight, the hardness of the rubber is not so high that processability becomes a problem, and the effect of copolymerizing the branched conjugated diene compound (1) for improving processability tends to be small,
- n is 25% by weight or more, it contributes to the improvement of the grip performance of the rubber and also causes a problem that the processability of the copolymer is deteriorated.
- the branched conjugated diene compound (1) It is preferable because the effect of improving the workability due to blending tends to appear remarkably, and when n is 40% by weight or more, the tendency is further strong.
- the upper limit is 99% by weight or less, preferably 97.5% by weight or less, more preferably 95% by weight or less, still more preferably 80% by weight or less, more preferably 60% by weight or less. If n exceeds 99% by weight, the copolymer does not become rubbery but resinous, and the effect of copolymerizing the branched conjugated diene compound (1) tends to be small.
- the total polymerization ratio of the monomers in the branched conjugated diene copolymer is 100% by weight, the total of (l) and (m) or the total of (l) and (n) is 100% by weight. is there. Therefore, if any one polymerization ratio is selected from the description of the preferred range of (l), (m) or (n) above, the remaining polymerization ratio is naturally determined.
- the copolymerization ratio (l) of the branched conjugated diene compound (1) is not particularly limited as long as it is 1 to 99% by weight, but the lower limit is preferably 2.5% by weight or more, and more preferably 5% by weight or more. Further preferred. If it is less than 1%, the effect of blending the branched conjugated diene compound (1) to improve processability tends to be insufficient. On the other hand, the upper limit is preferably less than 75% by weight, more preferably less than 60% by weight, further preferably less than 50% by weight, and further preferably less than 15% by weight. If it exceeds 99% by weight, it may be a fluid polymer, and the effect on the processability of the branched conjugated diene compound (1) tends to be sufficiently exerted if 15% by weight is added. .
- the lower limit of the copolymerization ratio (m) of the conjugated diene compound (2) is more than 0% by weight, and the preferred range is 1% by weight or more, preferably 30% by weight or more, more preferably 50% by weight or more. If m is less than 1% by weight, it tends to be a fluid polymer. On the other hand, the upper limit is less than 99% by weight, more preferably less than 80% by weight, still more preferably less than 72.5% by weight, and still more preferably less than 55% by weight. When m is 99% by weight or more, the effect of copolymerizing the branched conjugated diene compound (1) tends to be small for improving processability.
- the lower limit of the copolymerization ratio (n) of the vinyl compound (3) is more than 0% by weight, and the preferred range is 1% by weight or more, preferably 10% by weight or more, more preferably 25% by weight or more, and further preferably It is 40% by weight or more.
- n is less than 10% by weight, the hardness of the rubber is not so high that processability becomes a problem, and the effect of copolymerizing the branched conjugated diene compound (1) for improving processability tends to be small
- n is 25% by weight or more, it contributes to the improvement of the grip performance of the rubber and also causes a problem that the processability of the copolymer is deteriorated.
- the branched conjugated diene compound (1) It is preferable because the effect of improving the workability due to blending tends to appear remarkably, and when n is 40% by weight or more, the tendency is further strong.
- the upper limit is less than 99% by weight, preferably less than 97.5% by weight, more preferably less than 95% by weight, still more preferably less than 80% by weight, more preferably less than 60% by weight.
- n is 99% by weight or more, the copolymer does not become rubbery but resinous and the effect of copolymerizing the branched conjugated diene compound (1) tends to be small.
- the blending ratios (l), (m), and (n) of the branched conjugated diene compound (1), the conjugated diene compound (2), and the vinyl compound (3) in the branched conjugated diene copolymer are: Since it is 100% by weight, if any one of the lower limits is selected from the above-mentioned preferable range, the range that the upper limit value can take is automatically determined for the other two. If two arbitrary lower limit values are selected from the preferred range, the upper limit value is automatically determined for the remaining one. Similarly, as for the blending ratios (l), (m), and (n), if any one upper limit value is selected from the above preferable range, the range that the lower limit value can take is automatically determined for the other two. Moreover, if two arbitrary upper limit values are selected from the preferable range, the lower limit value is automatically determined for the remaining one.
- examples of the aliphatic hydrocarbon group having 6 to 11 carbon atoms include those having a normal structure such as a hexyl group, a heptyl group, an octyl group, a nonyl group, a decyl group, and an undecyl group. These isomers and / or unsaturated compounds, and derivatives thereof (for example, halides, hydroxylates, etc.) can be mentioned.
- Preferable examples include 4-methyl-3-pentenyl group, 4,8-dimethyl-nona-3,7-dienyl group, and derivatives thereof.
- branched conjugated diene compound (1) examples include, for example, myrcene and farnesene.
- myrcene includes both ⁇ -myrcene (2-methyl-6-methyleneocta-1,7-diene) and ⁇ -myrcene, of which ⁇ -myrcene has the following structure: -Myrcene (7-methyl-3-methyleneocta-1,6-diene) is preferred.
- farnesene includes any isomers such as ⁇ -farnesene ((3E, 7E) -3,7,11-trimethyl-1,3,6,10-dodecatetraene) and ⁇ -farnesene. Of these, (E) - ⁇ -farnesene (7,11-dimethyl-3-methylene-1,6,10-dodecatriene) having the following structure is preferred.
- branched conjugated diene compound (1) one or more compounds can be used.
- examples of the aliphatic hydrocarbon group having 1 to 3 carbon atoms include a methyl group, an ethyl group, an n-propyl group, and an isopropyl group. Of these, a methyl group is preferred.
- examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom, and among these, a chlorine atom is preferable.
- conjugated diene compound (2) for example, 1,3-butadiene, isoprene, 2,3-dimethyl-1,3-butadiene and the like are preferable, and among these, 1,3-butadiene, isoprene and the like are preferable.
- conjugated diene compound (2) one or more compounds can be used.
- examples of the aliphatic hydrocarbon group having 1 to 3 carbon atoms include a methyl group, an ethyl group, an n-propyl group, and an isopropyl group. Of these, a methyl group is preferred.
- Examples of the alicyclic hydrocarbon group having 3 to 8 carbon atoms include cyclopropyl group, cyclobutyl group, cyclopentyl group, cyclohexyl group, cycloheptyl group, cyclooctyl group, cyclopropenyl group, cyclobutenyl group, cyclopentenyl group, A cyclohexenyl group, a cycloheptenyl group, a cyclooctenyl group, etc. are mentioned, Of these, a cyclopropyl group and a cyclobutyl group are preferable.
- Examples of the aromatic hydrocarbon group having 6 to 10 carbon atoms include phenyl group, benzyl group, phenethyl group, tolyl group, xylyl group, and naphthyl group.
- the substitution position of the methyl group on the benzene ring in the tolyl group includes any position of ortho-, meta- or para-, and the substitution position of the methyl group in the xylyl group is any of the arbitrary substitution positions. Is also included. Of these, a phenyl group, a tolyl group, and a naphthyl group are preferable.
- the vinyl compound (3) are preferably styrene, ⁇ -methylstyrene, ⁇ -vinylnaphthalene or ⁇ -vinylnaphthalene.
- the vinyl compound (3) one type or two or more types can be used.
- the method for producing a copolymer according to the present invention will be described.
- the copolymerization of the branched conjugated diene compound (1) with the conjugated diene compound (2) and / or the vinyl compound (3) is not particularly limited in the order of copolymerization as long as each monomer component is copolymerized.
- all monomers may be randomly copolymerized at once, or a specific monomer (for example, a branched conjugated diene compound (1) monomer only, a conjugated diene compound (2) monomer only, a vinyl compound) (3) After copolymerizing only the monomer or any monomer selected from these, the remaining monomer is added for copolymerization, or the copolymer obtained by copolymerization in advance for each specific monomer is block copolymerized. You may let them.
- a specific monomer for example, a branched conjugated diene compound (1) monomer only, a conjugated diene compound (2) monomer only, a vinyl compound
- Such copolymerization can be carried out by a conventional method, for example, by anionic polymerization reaction, coordination polymerization or the like.
- the polymerization method is not particularly limited, and any of a solution polymerization method, an emulsion polymerization method, a gas phase polymerization method, and a bulk polymerization method can be used. Among these, the solution polymerization method is preferable. Further, the polymerization format may be either a batch type or a continuous type.
- the anionic polymerization can be carried out in a suitable solvent in the presence of an anionic polymerization initiator.
- Any conventional anionic polymerization initiator can be suitably used.
- Examples of such an anionic polymerization initiator include a general formula RLix (where R represents one or more carbon atoms).
- Suitable organolithium compounds include methyllithium, ethyllithium, n-butyllithium, sec-butyllithium, tert-butyllithium, phenyllithium and naphthyllithium.
- Preferred organolithium compounds are n-butyllithium and sec-butyllithium.
- An anionic polymerization initiator can be used individually or in mixture of 2 or more types. When the amount of the polymerization initiator used is less than 0.05 mmol, the copolymer tends to be resinous rather than rubbery, and when it exceeds 35 mmol, the copolymer is soft and has a branched conjugated diene for workability. There exists a tendency for the effect by copolymerizing a compound (1) to become small.
- any solvent can be used suitably as long as it does not deactivate the anionic polymerization initiator or stop the polymerization reaction.
- Either a polar solvent or a nonpolar solvent can be used.
- the polar solvent include ether solvents such as tetrahydrofuran
- examples of the nonpolar solvent include chain hydrocarbons such as hexane, heptane, octane and pentane, cyclic hydrocarbons such as cyclohexane, benzene and toluene.
- aromatic hydrocarbons such as xylene.
- Anionic polymerization is preferably performed in the presence of a polar compound.
- polar compounds include dimethyl ether, diethyl ether, ethyl methyl ether, ethyl propyl ether, tetrahydrofuran, dioxane, diphenyl ether, tripropylamine, tributylamine, trimethylamine, triethylamine, N, N, N ′, N′-tetramethylethylenediamine. (TMEDA).
- a polar compound can be used individually or in mixture of 2 or more types. This polar compound is useful for reducing the content of 1,2-structure with respect to controlling the microstructure of the butadiene moiety.
- the amount of the polar compound used varies depending on the type of the polar compound and the polymerization conditions, but is preferably 0.1 or more as the molar ratio (polar compound / anionic polymerization initiator) to the anionic polymerization initiator. If the molar ratio with the anionic polymerization initiator (polar compound / anionic polymerization initiator) is less than 0.1, the effect of the polar substance on controlling the microstructure tends to be insufficient.
- the reaction temperature at the time of anionic polymerization is not particularly limited as long as the reaction proceeds suitably, but is usually preferably ⁇ 10 ° C. to 100 ° C., more preferably 25 ° C. to 70 ° C.
- the reaction time varies depending on the charged amount, the reaction temperature, and other conditions, but usually, for example, about 3 hours is sufficient.
- the anionic polymerization can be stopped by adding a reaction terminator usually used in this field.
- a reaction terminator include polar solvents having active protons such as alcohols such as methanol, ethanol and isopropanol or acetic acid and mixtures thereof, or polar solvents and nonpolar solvents such as hexane and cyclohexane.
- polar solvents having active protons such as alcohols such as methanol, ethanol and isopropanol or acetic acid and mixtures thereof, or polar solvents and nonpolar solvents such as hexane and cyclohexane.
- a mixed solution is mentioned.
- the amount of the reaction terminator added is usually about the same molar amount or twice the molar amount relative to the anionic polymerization initiator.
- the branched conjugated diene copolymer can be obtained by removing the solvent from the polymerization solution by a conventional method or by pouring the polymerization solution into one or more times the amount of alcohol to obtain the branched conjugated diene copolymer. It can be easily isolated by precipitation.
- the coordination polymerization can be carried out by using a coordination polymerization initiator instead of the anionic polymerization initiator in the anionic polymerization.
- a coordination polymerization initiator any conventional one can be suitably used. Examples of such coordination polymerization initiator include transition metals such as lanthanoid compounds, titanium compounds, cobalt compounds, and nickel compounds.
- the catalyst which is a compound is mentioned. Further, if desired, an aluminum compound or a boron compound can be further used as a promoter.
- the lanthanoid compound is not particularly limited as long as it contains any of the elements having an atomic number of 57 to 71 (lanthanoid), but among these lanthanoids, neodymium is particularly preferable.
- lanthanoid compounds include carboxylates, ⁇ -diketone complexes, alkoxides, phosphates or phosphites, halides, and the like of these elements. Of these, carboxylates, alkoxides, and ⁇ -diketone complexes are preferred because of easy handling.
- Examples of the titanium compound include a cyclopentadienyl group, an indenyl group, a substituted cyclopentadienyl group or a substituted indenyl group, and 1 to 3 substituents selected from halogen, alkoxysilyl group, and alkyl group.
- Examples of the titanium-containing compound include compounds having one alkoxysilyl group from the viewpoint of catalyst performance.
- Examples of cobalt compounds include cobalt halides, carboxylates, ⁇ -diketone complexes, organic base complexes, and organic phosphine complexes.
- Examples of the nickel compound include nickel halides, carboxylates, ⁇ -diketone complexes, and organic base complexes.
- the catalyst used as the coordination polymerization initiator can be used alone or in combination of two or more.
- Examples of the aluminum compound used as a cocatalyst include organic aluminoxanes, halogenated organoaluminum compounds, organoaluminum compounds, and hydrogenated organoaluminum compounds.
- organic aluminoxanes include alkylaluminoxanes (methylaluminoxane, ethylaluminoxane, propylaluminoxane, butylaluminoxane, isobutylaluminoxane, octylaluminoxane, hexylaluminoxane, etc.), and examples of halogenated organoaluminum compounds include alkyl halides.
- Aluminum compounds are organic aluminum compounds.
- alkylaluminum compounds trimethylaluminum, triethylaluminum, triisopropylaluminum, triisobutylaluminum
- An organoaluminum compound Is for example, hydride alkylaluminum compound (diethyl aluminum hydride, diisobutyl aluminum hydride) and the like.
- boron compound examples include compounds containing anionic species such as tetraphenylborate, tetrakis (pentafluorophenyl) borate, and (3,5-bistrifluoromethylphenyl) borate. These promoters can also be used alone or in combination of two or more.
- the solvent and polar compound those described in the anionic polymerization can be used in the same manner.
- the reaction time and reaction temperature are also the same as those described in the anionic polymerization. Termination of the polymerization reaction and isolation of the branched conjugated diene copolymer can be performed in the same manner as in the case of anionic polymerization.
- the hydrogenation reaction of the branched conjugated diene copolymer obtained above can be carried out by a conventional method, and any of the catalytic hydrogenation using a metal catalyst, a method using hydrazine, etc. can be suitably used. No. 59-161415).
- catalytic hydrogenation with a metal catalyst can be carried out by adding hydrogen under pressure in the presence of a metal catalyst in an organic solvent.
- the organic solvent any of tetrahydrofuran, methanol, ethanol, etc. is suitable. Can be used for These organic solvents can be used individually by 1 type or in mixture of 2 or more types.
- metal catalyst for example, palladium, platinum, rhodium, ruthenium, nickel and the like can be preferably used. These metal catalysts can be used alone or in combination of two or more. .
- the pressure at the time of pressurization is preferably, for example, 1 to 300 kg weight / cm 2 .
- the weight average molecular weight (Mw) of the branched conjugated diene copolymer according to the present invention can be controlled by a conventional method. For example, it can be controlled by adjusting the amount of each monomer charged during polymerization with respect to the catalyst. it can. For example, if the total monomer / anion polymerization catalyst ratio or the total monomer / coordination polymerization catalyst ratio is increased, Mw can be increased, and conversely, if it is decreased, Mw can be decreased. The same applies to the number average molecular weight (Mn) of the branched conjugated diene copolymer.
- the Tg of the branched conjugated diene copolymer according to the present invention can be controlled by a conventional method.
- the Tg of the branched conjugated diene copolymer (1) can be made relatively low by increasing the amount of the branched conjugated diene compound (1) monomer.
- it can be relatively increased by increasing the amount of the vinyl compound (3) charged.
- the Mooney viscosity of the branched conjugated diene copolymer according to the present invention can be controlled by a conventional method, for example, by adjusting the amount of the branched conjugated diene compound (1) monomer charged during polymerization. Can do. For example, if the amount of the branched conjugated diene compound (1) monomer is decreased, the Mooney viscosity increases. Conversely, if the amount of the branched conjugated diene compound (1) monomer is increased, the Mooney viscosity decreases.
- the hydrogenated branched conjugated diene copolymer of the present invention thus obtained can be made into a rubber composition for tires by appropriately blending other components usually used in the field of rubber industry.
- examples of other components to be blended in the rubber composition of the present invention include rubber components, fillers, silane coupling agents, and the like.
- the blending amount of the hydrogenated branched conjugated diene copolymer in the rubber component is about 3% by weight or more, preferably about 5% by weight or more, more preferably 30% by weight or more. More preferably, it is 50% by weight or more. If the blending amount is less than 3% by weight, the effect of blending the hydrogenated branched conjugated diene copolymer with respect to processability tends to be small. On the other hand, there is no restriction
- examples of other rubber components used together with the hydrogenated branched conjugated diene copolymer according to the present invention include natural rubber (NR), isoprene rubber (IR), butadiene rubber (BR), and styrene butadiene rubber.
- Diene rubbers such as (SBR), styrene isoprene (SIR), styrene isoprene butadiene rubber (SIBR), ethylene propylene diene rubber (EPDM), chloroprene rubber (CR), acrylonitrile butadiene rubber (NBR), and butyl rubber (IIR) Can be mentioned.
- SBR natural rubber
- IR isoprene rubber
- BR butadiene rubber
- IIR styrene butadiene rubber
- EPDM ethylene propylene diene rubber
- CR chloroprene rubber
- NBR acrylonitrile butadiene rubber
- IIR butyl rubber
- NR, BR and SBR because the grip performance and wear resistance in combination with the branched conjugated diene copolymer can be obtained in a well-balanced manner, and the reason that particularly high grip performance is exhibited. Therefore, SBR is preferable.
- the hydrogenated branched conjugated diene copolymer according to the present invention when it is liquid, it can be blended into the rubber composition as a component other than the rubber component.
- the amount of the hydrogenated branched conjugated diene copolymer is 10 to 100 parts by weight, preferably 20 to 80 parts by weight, more preferably 30 to 70 parts by weight based on 100 parts by weight of the rubber component. It is. If it is less than 10 parts by weight, the effect of blending the hydrogenated branched conjugated diene copolymer with respect to processability tends to be small. On the other hand, if it exceeds 100 parts by weight, the effect of blending the hydrogenated branched conjugated diene copolymer with respect to the balance of grip performance and wear resistance tends to be small.
- filler examples include fillers usually used in this field such as carbon black and silica.
- N 2 SA nitrogen adsorption specific surface area
- the N 2 SA of carbon black is about 270 m 2 / g or less, preferably about 260 m 2 / g or less.
- N 2 SA of carbon black is larger than 270, the dispersion of carbon black tends to deteriorate.
- the compounding amount of carbon black is about 1 part by weight or more and preferably about 3 parts by weight or more with respect to 100 parts by weight of the rubber component.
- the blending amount of carbon black is less than 1 part by weight, the wear resistance tends to decrease.
- the compounding amount of carbon black is about 200 parts by weight or less, and more preferably 150 parts by weight or less. If the amount of carbon black exceeds 200 parts by weight, processability tends to deteriorate.
- silica examples include silica prepared by a dry method (anhydrous silicic acid), silica prepared by a wet method (hydrous silicic acid), and the like. Of these, silica prepared by a wet method is preferred because of the large number of silanol groups on the surface and many reactive sites with the silane coupling agent.
- the N 2 SA of the silica is about 50 m 2 / g or more, preferably about 80 m 2 / g or more. If N 2 SA is less than 50, the reinforcing effect is small and the wear resistance tends to be lowered. On the other hand, the N 2 SA of silica is about 300 m 2 / g or less, preferably about 250 m 2 / g or less. When N 2 SA is larger than 300 m 2 / g, the dispersion tends to decrease and the workability tends to decrease.
- the compounding amount of silica is about 1 part by weight or more and preferably about 10 parts by weight or more with respect to 100 parts by weight of the rubber component. If the amount of silica is less than 1 part by weight, the abrasion resistance tends to be insufficient. On the other hand, the compounding quantity of a silica is about 150 weight part or less, and it is more preferable that it is 100 or less. If the amount of silica exceeds 150 parts by weight, the dispersibility of silica tends to deteriorate and the processability tends to deteriorate.
- the rubber composition preferably contains a silane coupling agent.
- a silane coupling agent a conventionally known silane coupling agent can be used.
- silane coupling agents may be used alone or in combination of two or more.
- bis (3-triethoxysilylpropyl) tetrasulfide and bis (3-triethoxysilylpropyl) disulfide are preferably contained from the viewpoint of good processability.
- the blending amount is preferably 1 part by weight or more, and more preferably 2 parts by weight or more with respect to 100 parts by weight of silica.
- the content of the silane coupling agent is less than 1 part by weight, effects such as improvement in dispersibility tend not to be obtained sufficiently.
- the content of the silane coupling agent is preferably 20 parts by weight or less, and more preferably 15 parts by weight or less. When the content of the silane coupling agent exceeds 20 parts by weight, a sufficient coupling effect cannot be obtained and the reinforcing property tends to be lowered.
- the rubber composition of the present invention includes compounding agents conventionally used in the rubber industry, such as other reinforcing fillers, anti-aging agents, vulcanizing agents such as oils, waxes, sulfur, etc. Sulfur accelerators, vulcanization accelerators and the like can be appropriately blended.
- the rubber composition of the present invention thus obtained can be used suitably as a tire tread, particularly as a tire tread for a racing tire, because both the wear resistance and the grip performance can be improved to a high level. Can do.
- the rubber composition of the present invention is used for manufacturing tires, and can be made into tires by an ordinary method. That is, if necessary, a mixture containing the above ingredients is kneaded, extruded in accordance with the shape of each member of the tire at an unvulcanized stage, and molded on a tire molding machine by a normal method. Thus, an unvulcanized tire is formed.
- a tire can be obtained by heating and pressurizing the unvulcanized tire in a vulcanizer, and air can be put into the tire to obtain a pneumatic tire.
- Mw and Mn are measured using a gel permeation chromatograph (GPC) and converted from standard polystyrene.
- the hydrogenation (hydrogenation) rate (%) is obtained according to the following calculation formula by calculating the iodine value using the iodine value method.
- Hydrogenation rate (%) [ ⁇ 1- (iodine value after hydrogenation) ⁇ / (iodine value before hydrogenation)] ⁇ 100
- the glass transition temperature (Tg) is measured by a differential scanning calorimeter (DSC).
- Mooney viscosity is measured according to JIS K 6300. Simply referring to “1 to 99% by weight” includes values at both ends.
- Copolymer synthesized according to the description of the present specification SBR: Toughden 4850 manufactured by Asahi Kasei Chemicals Co., Ltd. (S-SBR; contains 50% oil based on 100 g of SBR solid content; styrene content 39% by mass ) Carbon black: Show black N220 manufactured by Cabot Japan Co., Ltd. (nitrogen adsorption specific surface area (N2SA): 125 m 2 / g)
- Anti-aging agent NOCRACK 6C (N-1,3-dimethylbutyl-N′-phenyl-p-phenylenediamine) manufactured by Ouchi Shinsei Chemical Industry Co., Ltd.
- Stearic acid Zinc stearate manufactured by NOF Corporation: Zinc Hua No. 1 manufactured by Mitsui Mining & Smelting Co., Ltd.
- Sulfur Powdered sulfur vulcanization accelerator manufactured by Tsurumi Chemical Co., Ltd .: Ouchi Shinsei Chemical Industry Co., Ltd. Noxeller CZ (N-cyclohexyl-2-benzothiazolylsulfenamide)
- Production Example 4-1 (Synthesis of Copolymer 4) 200 g of Copolymer 3 was treated in the same manner as in Production Example 2-1, to obtain 200 g of Copolymer 4.
- Production Example 6-1 (Synthesis of Copolymer 6) 200 g of copolymer 5 was treated in the same manner as in Production Example 2-1, to obtain 200 g of copolymer 6.
- Production Example 7-1 (Synthesis of Copolymer 7) After adding 500 ml of hexane, 46 g of THF, and 40 mmol of n-butyllithium (n-BuLi) to a 1 L pressure-resistant stainless steel container that has been dried and purged with nitrogen, a mixture of 100 ml of hexane, 95 g of butadiene, 55 g of myrcene, and 125 g of styrene is added to the reaction container. The polymerization reaction was carried out while dropping over 2 hours. After completion of the dropwise addition, 10 ml of 2M isopropanol / hexane solution was dropped to complete the reaction. The reaction solution was air-dried overnight, and further dried under reduced pressure for 2 days to obtain 275 g of copolymer 7. The polymerization conversion was almost 100%.
- Production Example 8-1 (Synthesis of Copolymer 8) 200 g of copolymer 7 was treated in the same manner as in Production Example 2-1, to obtain 200 g of copolymer 8.
- Production Example 9-1 (Synthesis of Copolymer 9) A copolymer 9275 (275 g) was obtained in the same manner as in Production Example 7-1 except that 95 g of isoprene was used instead of 95 g of butadiene. The polymerization conversion was almost 100%.
- Production Example 10-1 (Synthesis of Copolymer 10) 200 g of copolymer 9 was treated in the same manner as in Production Example 2-1, to obtain 200 g of copolymer 8.
- Production Example 2-2 to Production Example 10-2 In accordance with the formulation shown in Table 2, the corresponding raw material compounds were treated in the same manner as in Production Example 1-2 to obtain unvulcanized rubber compositions 2 to 10 and pneumatic tires 2 to 10, respectively.
- Tg glass transition temperature
- the copolymerization ratio (l) (% by weight) was measured by a conventional method using pyrolysis gas chromatography (PGC). That is, a calibration curve for the purified branched conjugated diene compound (1) was prepared, and the branched conjugated diene in the copolymer was determined from the area ratio of the thermal decomposition product derived from the branched conjugated diene compound (1) obtained by PGC. The weight percent of compound (1) was calculated.
- a system comprising a gas chromatograph mass spectrometer GCMS-QP5050A manufactured by Shimadzu Corporation and a pyrolysis apparatus JHP-330 manufactured by Nippon Analytical Industries, Ltd. was used.
- Production Example 12-1 (Synthesis of Copolymer 12)
- 200 g of the copolymer 11 obtained above, 300 g of THF, 10 g of 10% palladium carbon were added, and after nitrogen substitution, hydrogen substitution was performed so that the pressure became 5.0 kgf / cm 2 .
- the reaction was performed at 80 ° C. After completion of the reaction, the reaction solution was filtered to remove palladium carbon, and then the filtrate was air-dried overnight and further dried under reduced pressure for 2 days to obtain 200 g of copolymer 12.
- the hydrogenation rate was 50%.
- Production Example 14-1 (Synthesis of Copolymer 14) 200 g of copolymer 13 was treated in the same manner as in Production Example 12-1, to obtain 200 g of copolymer 14.
- Production Example 16-1 (Synthesis of Copolymer 16) 200 g of copolymer 15 was treated in the same manner as in Production Example 12-1, to obtain 200 g of copolymer 16.
- Production Example 17-1 (Synthesis of Copolymer 17) A copolymer 17275 (275 g) was obtained in the same manner as in Production Example 15-1, except that farnesene (55 g) and butadiene (95 g) were used instead of farnesene (150 g). The polymerization conversion was almost 100%.
- Production Example 18-1 (Synthesis of Copolymer 18) 200 g of copolymer 17 was treated in the same manner as in Production Example 12-1, to obtain 200 g of copolymer 18.
- Production Example 19-1 (Synthesis of Copolymer 19) A copolymer 19275 (275 g) was obtained in the same manner as in Production Example 17-1, except that isoprene was used instead of butadiene. The polymerization conversion was almost 100%.
- Production Example 20-1 (Synthesis of Copolymer 20) 200 g of copolymer 19 was treated in the same manner as in Production Example 12-1, to obtain 200 g of copolymer 20.
- Production Example 12-2 to Production Example 20-2 In accordance with the formulation shown in Table 4, the corresponding raw material compounds were treated in the same manner as in Production Example 11-2 to obtain unvulcanized rubber compositions 12 to 20 and pneumatic tires 12 to 20, respectively.
- Tg glass transition temperature
- the copolymerization ratio (l) (% by weight) was measured by a conventional method using pyrolysis gas chromatography (PGC). That is, a calibration curve for the purified branched conjugated diene compound (1) was prepared, and the branched conjugated diene in the copolymer was determined from the area ratio of the thermal decomposition product derived from the branched conjugated diene compound (1) obtained by PGC. The weight percent of compound (1) was calculated.
- a system comprising a gas chromatograph mass spectrometer GCMS-QP5050A manufactured by Shimadzu Corporation and a pyrolysis apparatus JHP-330 manufactured by Nippon Analytical Industries, Ltd. was used.
- a novel branched conjugated diene copolymer or hydrogenated branched conjugated diene copolymer useful for improving processability can be provided as a rubber component for tires, and these copolymers are used.
- a tire rubber composition in which both wear resistance and grip performance are improved to a high level while exhibiting excellent properties in improving processability.
- production of a bleed can be provided further.
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Abstract
Description
で示される分枝共役ジエン化合物(1)と、一般式(2)
で示される共役ジエン化合物および/または一般式(3)
で示されるビニル化合物とを共重合した後、該共重合体を水素添加して得られる水添分枝共役ジエン共重合体であって、
分枝共役ジエン化合物(1)の共重合比(l)が1~99重量%、共役ジエン化合物(2)の共重合比(m)が99~0重量%、ビニル化合物(3)の共重合比(n)が99~0重量%である水添分枝共役ジエン共重合体に関する。
で示される分枝共役ジエン化合物と、一般式(3)
で示されるビニル化合物とを共重合して得られる分枝共役ジエン共重合体であって、
分枝共役ジエン化合物(1)の共重合比(l)が1~99重量%、ビニル化合物(3)の共重合比(n)が99~1重量%である分枝共役ジエン共重合体に関する。
本発明の水添分枝共役ジエン共重合体とは、分枝共役ジエン化合物(1)と、共役ジエン化合物(2)および/またはビニル化合物(3)とを共重合した後、該共重合体を水素添加して得られるものをいう。
上記水添分枝共役ジエン共重合体についての説明は、明らかな矛盾がない限り、いずれも、本発明の分枝共役ジエン共重合体にもあてはまるものである。
分枝共役ジエン化合物(1)の共重合比(l)は、1~99重量%であれば特に限定はないが、下限値としては、2.5重量%以上が好ましく、5%以上がさらに好ましい。1%未満では加工性を改善するという分枝共役ジエン化合物(1)配合の効果が十分に得られない傾向がある。一方、上限値としては、75重量%以下が好ましく、60重量%以下がより好ましく、50重量%以下がさらに好ましく、15重量%以下がさらに好ましい。99重量%超では流動性のある重合体となる傾向があり、また、分枝共役ジエン化合物(1)の加工性に対する効果は15重量%も配合すれば十分発揮される傾向があるからである。
分枝共役ジエン化合物(1)の共重合比(l)は、1~99重量%であれば特に限定はないが、下限値としては、2.5重量%以上が好ましく、5重量%以上がさらに好ましい。1%未満では加工性を改善するという分枝共役ジエン化合物(1)配合の効果が十分に得られない傾向がある。一方、上限値としては、75重量%未満が好ましく、60重量%未満がより好ましく、50重量%未満がさらに好ましく、15重量%未満がさらに好ましい。99重量%超では流動性のある重合体となる場合があり、また、分枝共役ジエン化合物(1)の加工性に対する効果は15重量%も配合すれば十分発揮される傾向があるからである。
分枝共役ジエン化合物(1)において、炭素数6~11の脂肪族炭化水素基としては、例えば、ヘキシル基、ヘプチル基、オクチル基、ノニル基、デシル基、ウンデシル基等のノルマル構造のもの、それらの異性体かつ/または不飽和体、並びに、それらの誘導体(例えば、ハロゲン化物、水酸基化物等)が挙げられる。好ましい例としては、4-メチル-3-ペンテニル基、4,8-ジメチル-ノナ-3,7-ジエニル基等、および、それらの誘導体が挙げられる。
共役ジエン化合物(2)において、炭素数1~3の脂肪族炭化水素基としてはメチル基、エチル基、n-プロピル基、イソプロピル基等が挙げられ、このうちメチル基がこのましい。ハロゲン原子としては、フッ素原子、塩素原子、臭素原子、ヨウ素原子が挙げられ、このうち、塩素原子が好ましい。共役ジエン化合物(2)の具体例としては、例えば、1,3-ブタジエン、イソプレン、2,3-ジメチル-1,3-ブタジエン等が好ましく、このうち、1,3-ブタジエン、イソプレン等が好ましい。共役ジエン化合物(2)としては、1種または2種以上のものを使用することができる。
ビニル化合物(3)において、炭素数1~3の脂肪族炭化水素基としてはメチル基、エチル基、n-プロピル基、イソプロピル基等が挙げられ、このうちメチル基がこのましい。炭素数3~8の脂環式炭化水素基としては、シクロプロピル基、シクロブチル基、シクロペンチル基、シクロへキシル基、シクロへプチル基、シクロオクチル基、シクロプロペニル基、シクロブテニル基、シクロペンテニル基、シクロへキセニル基、シクロへプテニル基、シクロオクテニル基等が挙げられ、このうちシクロプロピル基、シクロブチル基が好ましい。炭素数6~10の芳香属炭化水素基としては、フェニル基、ベンジル基、フェネチル基、トリル(tolyl)基、キシリル(xylyl)基、ナフチル基などが挙げられる。但し、トリル基におけるベンゼン環上のメチル基の置換位置はオルト-、メタ-もしくはパラ-のいずれの位置も含むものであり、キシリル基におけるメチル基の置換位置も、任意の置換位置のいずれをも含むものである。これらのうち、フェニル基、トリル(tolyl)基、ナフチル基が好ましい。ビニル化合物(3)の具体例としては、スチレン、α-メチルスチレン、α-ビニルナフタレンまたはβ-ビニルナフタレンが好ましい。ビニル化合物(3)としては、1種または2種以上のものを使用することができる。
分枝共役ジエン化合物(1)と、共役ジエン化合物(2)および/またはビニル化合物(3)との共重合は、各モノマー成分を共重合させるものである限り、共重合させる順序において特に限定はなく、例えば、すべてのモノマーを一度にランダム共重合させてもよいし、あるいは、あらかじめ特定のモノマー(例えば、分枝共役ジエン化合物(1)モノマーのみ、共役ジエン化合物(2)モノマーのみ、ビニル化合物(3)モノマーのみ、あるいは、これらから選ばれる任意のモノマーなど)を共重合させた後に、残りのモノマーを加えて共重合させたり、特定のモノマー毎に予め共重合させたものをブロック共重合させてもよい。
該アニオン重合は、アニオン重合開始剤の存在下、適当な溶媒中で実施することができる。アニオン重合開始剤としては、慣用のものをいずれも好適に使用することができ、そのようなアニオン重合開始剤としては、例えば、一般式RLix(但し、Rは1個またはそれ以上の炭素原子を含む脂肪族、芳香族または脂環式基であり、xは1~20の整数である。)を有する有機リチウム化合物があげられる。適当な有機リチウム化合物としては、メチルリチウム、エチルリチウム、n-ブチルリチウム、sec-ブチルリチウム、tert-ブチルリチウム、フェニルリチウムおよびナフチルリチウムが挙げられる。好ましい有機リチウム化合物はn-ブチルリチウムおよびsec-ブチルリチウムである。アニオン重合開始剤は、単独でまたは2種以上を混合して用いることができる。重合開始剤の使用量が0.05mmol未満では共重合体がゴム状とならず樹脂状となる傾向があり、35mmolより多い場合には、共重合体が軟らかく加工性に対して分枝共役ジエン化合物(1)を共重合させることによる効果が小さくなる傾向がある。
配位重合は、上記アニオン重合におけるアニオン重合開始剤に代えて、配位重合開始剤を用いることにより、実施することができる。配位重合開始剤としては、慣用のものをいずれも好適に用いることができ、そのような配位重合開始剤としては、例えば、ランタノイド化合物、チタン化合物、コバルト化合物、ニッケル化合物等の遷移金属含有化合物である触媒が挙げられる。また、所望により、さらにアルミニウム化合物、ホウ素化合物を助触媒として使用することができる。
上記で得られる分枝共役ジエン共重合体の水素添加反応は、常法により実施することができ、金属触媒による接触水素添加、ヒドラジンを用いる方法などをいずれも好適に使用することができる(特開昭59-161415号公報など)。例えば、金属触媒による接触水素添加は、有機溶媒中、金属触媒の存在下、水素を加圧添加することにより実施することができ、該有機溶媒としては、テトラヒドロフラン、メタノール、エタノール等をいずれも好適に使用することができる。これら有機溶媒は、1種単独でまたは2種以上を混合して用いることができる。また、金属触媒としては、例えば、パラジウム、白金、ロジウム、ルテニウム、ニッケルなどをいずれも好適に使用することができる、これら金属触媒は1種単独でまたは2種以上を混合して用いることができる。加圧する際の圧力としては、例えば、1~300kg重/cm2であることが好ましい。
こうして得られる本発明の水添分枝共役ジエン共重合体は、ゴム工業の分野で通常使用される他の成分を適宜配合することによりタイヤ用ゴム組成物とすることができる。本発明のゴム組成物に配合すべき他の成分としては、例えば、ゴム成分、充填剤、シランカップリング剤などが挙げられる。
水添分枝共役ジエン共重合体を用いたゴム組成物に関する上記の説明は、明らかな矛盾がない限り、分枝共役ジエン共重合体を用いたゴム組成物に関しても、そのまま適用することができる。
水素添加(水添)率(%)は、ヨウ素価法を用いてヨウ素価を算出し、以下の計算式に従って求められる。
水添率(%)=〔{1-(水添後のヨウ素価)}/(水添前のヨウ素価)〕×100
ガラス転移温度(Tg)は、示差走査熱量計(DSC)により測定される。
ムーニー粘度は、JIS K 6300に準じて測定される。
単に、「1~99重量%」というときは、両端の値を含むものである。
ヘキサン:関東化学(株)製の無水ヘキサン
イソプロパノール:関東化学(株)製のイソプロパノール
THF:関東化学(株)製のテトラヒドロフラン
ミルセン:和光純薬(株)のβ-ミルセン
ファルネセン:日本テルペン化学(株)の(E)-β-ファルネセン(試薬)
イソプレン:和光純薬(株)のイソプレン
ブタジエン:高千穂化学工業(株)製の1,3-ブタジエン
スチレン:和光純薬(株)のスチレン
共重合体:本明細書の記載に従い合成したもの
SBR:旭化成ケミカルズ(株)製のタフデン4850(S-SBR;SBR固形分100gに対し、50%のオイルを含有する;スチレン含有量39質量%)
カーボンブラック:キャボットジャパン(株)製のショウブラックN220(チッ素吸着比表面積(N2SA):125m2/g)
老化防止剤:大内新興化学工業(株)製のノクラック6C(N-1,3-ジメチルブチル-N’-フェニル-p-フェニレンジアミン)
ステアリン酸:日油(株)製のステアリン酸
酸化亜鉛:三井金属鉱業(株)製の亜鉛華1号
硫黄:鶴見化学(株)製の粉末硫黄
加硫促進剤:大内新興化学工業(株)製のノクセラーCZ(N-シクロヘキシル-2-ベンゾチアゾリルスルフェンアミド)
1.共重合体の合成
製造例1-1(共重合体1の合成)
乾燥し窒素置換した3Lの耐圧ステンレス容器に、ヘキサン 2000ml、ブタジエン 110g、スチレン 90gとともにTMEDA 0.22mmolを加え、さらにn-ブチルリチウム(n-BuLi)35mmolを加えた後、50℃で5時間重合反応を行った。5時間後、1Mイソプロパノール/ヘキサン溶液を1.15ml滴下し、反応を終了させた。冷却後、反応液を1晩風乾し、さらに2日間減圧乾燥を行い、共重合体1 200gを得た。重合添加率(「乾燥重量/仕込量」)は、ほぼ100%であった。
1Lの耐圧ステンレス容器に、上記で得た共重合体1 200g、THF 300g、10%パラジウムカーボン 10gを加え、窒素置換した後、圧力が5.0kgf/cm2となるように水素置換して、80℃で反応させた。反応終了後、反応液をろ過してパラジウムカーボンを除去した後、ろ液を1晩風乾し、さらに2日間減圧乾燥を行い、共重合体2 200gを得た。水素添加率は50%であった。
乾燥し窒素置換した1Lのガラス容器にヘキサン 500ml、THF 46g、n-ブチルリチウム(n-BuLi)45mmolを加えた後、反応容器にヘキサン 100ml、イソプレン 150g、スチレン 125gの混合液を2時間かけて滴下しながら重合反応をおこなった。滴下終了後直ちに、2Mイソプロパノール/ヘキサン溶液を20ml滴下して反応を終了させた。冷却後、反応液を1晩風乾し、さらに2日間減圧乾燥を行い、共重合体3 275gを得た。重合転化率はほぼ100%であった。
共重合体3 200gを、製造例2-1と同様に処理して、共重合体4 200gを得た。
乾燥し窒素置換した1Lのガラス容器にヘキサン 500ml、THF 46g、n-ブチルリチウム(n-BuLi)40mmolを加えた後、反応容器にヘキサン 100ml、ミルセン 150g、スチレン 125gの混合液を2時間かけて滴下しながら重合反応をおこなった。滴下終了後直ちに、2Mイソプロパノール/ヘキサン溶液を10ml滴下して反応を終了させた。冷却後、反応液を1晩風乾し、さらに2日間減圧乾燥を行い、共重合体5 275gを得た。重合転化率はほぼ100%であった。
共重合体5 200gを、製造例2-1と同様に処理して、共重合体6 200gを得た。
乾燥し窒素置換した1Lの耐圧ステンレス容器にヘキサン 500ml、THF 46g、n-ブチルリチウム(n-BuLi)40mmolを加えた後、反応容器にヘキサン 100ml、ブタジエン95g、ミルセン 55g、スチレン 125gの混合液を2時間かけて滴下しながら重合反応をおこなった。滴下終了後、2Mイソプロパノール/ヘキサン溶液を10ml滴下して反応を終了させた。反応液を1晩風乾し、さらに2日間減圧乾燥を行い、共重合体7 275gを得た。重合転化率はほぼ100%であった。
共重合体7 200gを、製造例2-1と同様に処理して、共重合体8 200gを得た。
ブタジエン 95gに代えて、イソプレン95gを使用した以外は、製造例7-1と同様に処理して、共重合体9 275gを得た。重合転化率はほぼ100%であった。
共重合体9 200gを、製造例2-1と同様に処理して、共重合体8 200gを得た。
製造例1-2
(1)表2記載の配合に従い、上記で得た共重合体1と、上記ゴム組成物製造用の各種薬品(硫黄および加硫促進剤を除く)を、バンバリーミキサーにて、150℃で5分間混練りし、混練り物を得た。得られた混練物に、硫黄ならびに加硫促進剤を添加して、オープンロールを用いて、170℃で12分間混練りし、未加硫ゴム組成物1を得た。
(2)上記(1)で得た未加硫ゴム組成物を、タイヤトレッドの形状に合わせて押出し加工し、タイヤ成形機上にて他の部材と合わせて成形することにより未加硫タイヤとした。この未加硫タイヤを、加硫機中で、170℃で20分間プレス加硫し、タイヤを得た。このタイヤに空気を入れ、空気入りタイヤ1を得た。
表2記載の配合に従い、対応原料化合物を製造例1-2と同様に処理して、未加硫ゴム組成物2~10および空気入りタイヤ2~10を、それぞれ得た。
<共重合体>
上記で得た共重合体1~10について、重量平均分子量Mw、数平均分子量Mn、ガラス転移温度Tg、ムーニー粘度および共重合比(l)を、以下方法に従い測定した。結果を表1に示す。
Mw、Mnは、東ソー(株)製GPC-8000シリーズの装置、検知器として示差屈折計を用いて測定し、標準ポリスチレンにより校正した。
各共重合体について、示差走査熱量計(DSC)を用い、昇温速度10℃/分にて開始温度-150℃から最終温度150℃までを測定しTgを算出した。
各共重合体について、JIS K 6300「未加硫ゴムの試験方法」に準じて、ムーニー粘度試験機を用いて、1分間の予熱によって熱せられた130℃の温度条件にて、大ローターを回転させ、4分間経過した時点でのムーニー粘度ML1+4(130℃)を測定した。なお、ムーニー粘度が小さいほど、加工性に優れることを示している。
該共重合比(l)(重量%)は、熱分解ガスクロマトグラフィー(PGC)による定法によって測定した。すなわち、精製した分枝共役ジエン化合物(1)についての検量線を作製し、PGCによって得られる分枝共役ジエン化合物(1)由来の熱分解物の面積比から共重合体中の分枝共役ジエン化合物(1)の重量%を算出した。熱分解クロマトグラフィーは(株)島津製作所製のガスクロマトグラフ質量分析計GCMS-QP5050Aと日本分析工業(株)製の熱分解装置JHP-330から構成されるシステムを使用した。
上記で得た未加硫ゴム組成物1~10および空気入りタイヤ1~10を用いて、下記の試験を行った。結果を表2に示す。
各未加硫ゴム組成物から所定のサイズの試験片を作成し、JIS K 6300「未加硫ゴムの試験方法」に準じて、ムーニー粘度試験機を用いて、1分間の予熱によって熱せられた130℃の温度条件にて、大ローターを回転させ、4分間経過した時点でのムーニー粘度ML1+4(130℃)を測定した。なお、ムーニー粘度が小さいほど、加工性に優れることを示している。
(グリップ性能)
上記で得た各空気入りタイヤを用いて、アスファルト路面のテストコースにて実車走行を行なった。その際における操舵時のコントロール安定性をテストドライバーが10段階評価した。数値の大きい方が、グリップ性能が優れていることを示している。
(耐摩耗性能)
各空気入りタイヤを用いてテストコースを20周走行し、走行前後における溝の深さを測定し、空気入りタイヤ1を用いた場合を100として指数表示した。数値が大きいほど耐摩耗性が大きく優れていることを示している。
(耐ブリード性)
各空気入りタイヤ表面を観察し、オイル状のもののブリードの程度を目視にて判断した。
○:ブリードなし
△:ややブリード気味
×:ブリード激しい
製造例11-1(共重合体11の合成)
乾燥し窒素置換した3Lの耐圧ステンレス容器に、ヘキサン 2000ml、ブタジエン 110g、スチレン 90gとともにTMEDA 0.22mmolを加え、さらにn-ブチルリチウム(n-BuLi)35mmolを加えた後、50℃で5時間重合反応を行った。5時間後、1Mイソプロパノール/ヘキサン溶液を1.15ml滴下し、反応を終了させた。冷却後、反応液を1晩風乾し、さらに2日間減圧乾燥を行い、共重合体11 200gを得た。重合添加率(「乾燥重量/仕込量」)は、ほぼ100%であった。
1Lの耐圧ステンレス容器に、上記で得た共重合体11 200g、THF 300g、10%パラジウムカーボン 10gを加え、窒素置換した後、圧力が5.0kgf/cm2となるように水素置換して、80℃で反応させた。反応終了後、反応液をろ過してパラジウムカーボンを除去した後、ろ液を1晩風乾し、さらに2日間減圧乾燥を行い、共重合体12 200gを得た。水素添加率は50%であった。
乾燥し窒素置換した1Lのガラス容器にヘキサン 500ml、THF 46g、n-ブチルリチウム(n-BuLi)45mmolを加えた後、反応容器にヘキサン 100ml、イソプレン 150g、スチレン 125gの混合液を2時間かけて滴下しながら重合反応をおこなった。滴下終了後直ちに、2Mイソプロパノール/ヘキサン溶液を20ml滴下して反応を終了させた。冷却後、反応液を1晩風乾し、さらに2日間減圧乾燥を行い、共重合体13 275gを得た。重合転化率はほぼ100%であった。
共重合体13 200gを、製造例12-1と同様に処理して、共重合体14 200gを得た。
乾燥し窒素置換した1Lのガラス容器にヘキサン 500ml、THF 46g、n-ブチルリチウム(n-BuLi)40mmolを加えた後、反応容器にヘキサン 100ml、ファルネセン 150g、スチレン 125gの混合液を2時間かけて滴下しながら重合反応をおこなった。滴下終了後直ちに、2Mイソプロパノール/ヘキサン溶液を10ml滴下して反応を終了させた。冷却後、反応液を1晩風乾し、さらに2日間減圧乾燥を行い、共重合体15 275gを得た。重合転化率はほぼ100%であった。
共重合体15 200gを、製造例12-1と同様に処理して、共重合体16 200gを得た。
ファルネセン 150gに代えて、ファルネセン 55gおよびブタジエンン 95gを使用した以外は、製造例15-1と同様に処理して、共重合体17 275gを得た。重合転化率はほぼ100%であった。
共重合体17 200gを、製造例12-1と同様に処理して、共重合体18 200gを得た。
ブタジエンに代えて、イソプレンを使用した以外は、製造例17-1と同様に処理して、共重合体19 275gを得た。重合転化率はほぼ100%であった。
共重合体19 200gを、製造例12-1と同様に処理して、共重合体20 200gを得た。
製造例11-2
(1)表4記載の配合に従い、上記で得た共重合体11と、上記ゴム組成物製造用の各種薬品(硫黄および加硫促進剤を除く)を、バンバリーミキサーにて、150℃で5分間混練りし、混練り物を得た。得られた混練物に、硫黄ならびに加硫促進剤を添加して、オープンロールを用いて、170℃で12分間混練りし、未加硫ゴム組成物11を得た。
(2)上記(1)で得た未加硫ゴム組成物を、タイヤトレッドの形状に合わせて押出し加工し、タイヤ成形機上にて他の部材と合わせて成形することにより未加硫タイヤとした。この未加硫タイヤを、加硫機中で、170℃で20分間プレス加硫し、タイヤを得た。このタイヤに空気を入れ、空気入りタイヤ11を得た。
表4記載の配合に従い、対応原料化合物を製造例11-2と同様に処理して、未加硫ゴム組成物12~20および空気入りタイヤ12~20を、それぞれ得た。
<共重合体>
上記で得た共重合体11~20について、重量平均分子量Mw、数平均分子量Mn、ガラス転移温度Tg、ムーニー粘度および共重合比(l)を、以下方法に従い測定した。結果を表3に示す。
Mw、Mnは、東ソー(株)製GPC-8000シリーズの装置、検知器として示差屈折計を用いて測定し、標準ポリスチレンにより校正した。
各共重合体について、示差走査熱量計(DSC)を用い、昇温速度10℃/分にて開始温度-150℃から最終温度150℃までを測定しTgを算出した。
各共重合体について、JIS K 6300「未加硫ゴムの試験方法」に準じて、ムーニー粘度試験機を用いて、1分間の予熱によって熱せられた130℃の温度条件にて、大ローターを回転させ、4分間経過した時点でのムーニー粘度ML1+4(130℃)を測定した。なお、ムーニー粘度が小さいほど、加工性に優れることを示している。
該共重合比(l)(重量%)は、熱分解ガスクロマトグラフィー(PGC)による定法によって測定した。すなわち、精製した分枝共役ジエン化合物(1)についての検量線を作製し、PGCによって得られる分枝共役ジエン化合物(1)由来の熱分解物の面積比から共重合体中の分枝共役ジエン化合物(1)の重量%を算出した。熱分解クロマトグラフィーは(株)島津製作所製のガスクロマトグラフ質量分析計GCMS-QP5050Aと日本分析工業(株)製の熱分解装置JHP-330から構成されるシステムを使用した。
上記で得た未加硫ゴム組成物11~20および空気入りタイヤ11~20を用いて、下記の試験を行った。結果を表4に示す。
各未加硫ゴム組成物から所定のサイズの試験片を作成し、JIS K 6300「未加硫ゴムの試験方法」に準じて、ムーニー粘度試験機を用いて、1分間の予熱によって熱せられた130℃の温度条件にて、大ローターを回転させ、4分間経過した時点でのムーニー粘度ML1+4(130℃)を測定した。なお、ムーニー粘度が小さいほど、加工性に優れることを示している。
(グリップ性能)
上記で得た各空気入りタイヤを用いて、アスファルト路面のテストコースにて実車走行を行なった。その際における操舵時のコントロール安定性をテストドライバーが10段階評価した。数値の大きい方が、グリップ性能が優れていることを示している。
(耐摩耗性能)
各空気入りタイヤを用いてテストコースを20周走行し、走行前後における溝の深さを測定し、空気入りタイヤ11を用いた場合を100として指数表示した。数値が大きいほど耐摩耗性が大きく優れていることを示している。
(耐ブリード性)
各空気入りタイヤ表面を観察し、オイル状のもののブリードの程度を目視にて判断した。
○:ブリードなし
△:ややブリード気味
×:ブリード激しい
Claims (17)
- 一般式(1)
で示される分枝共役ジエン化合物(1)と、一般式(2)
で示される共役ジエン化合物および/または一般式(3)
で示されるビニル化合物とを共重合した後、該共重合体を水素添加して得られる水添分枝共役ジエン共重合体であって、
分枝共役ジエン化合物(1)の共重合比(l)が1~99重量%、共役ジエン化合物(2)の共重合比(m)が99~0重量%、ビニル化合物(3)の共重合比(n)が99~0重量%である水添分枝共役ジエン共重合体。 - 分枝共役ジエン化合物(1)を共役ジエン化合物(2)で置き換えた同一の重量平均分子量の重合体との比較において、ゴム組成物に配合した際の該ゴム組成物のムーニー粘度ML1+4(130℃)が低い値を示すものである、加工性改善用の、請求項1記載の水添分枝共役ジエン共重合体。
- 重量平均分子量が2000~20万である請求項1または2記載の水添分枝共役ジエン共重合体。
- 水素添加率が10~90%である請求項1~3のいずれか1項に記載の水添分枝共役ジエン共重合体。
- ビニル化合物(3)の共重合比(n)が40重量%以上である請求項1~4のいずれか1項に記載の水添分枝共役ジエン共重合体。
- 分枝共役ジエン化合物(1)が、ミルセンおよび/またはファルネセンである請求項1~5のいずれか1項に記載の分枝共役ジエン共重合体。
- 共役ジエン化合物(2)が、1,3-ブタジエンおよび/またはイソプレンである請求項1~6のいずれか1項に記載の水添分枝共役ジエン共重合体。
- ビニル化合物(3)が、スチレン、α-メチルスチレン、α-ビニルナフタレンおよびβ-ビニルナフタレンからなる群から選択される1種または2種以上である請求項1~7のいずれか1項に記載の水添分枝共役ジエン共重合体。
- 請求項1~8のいずれか1項に記載の水添分枝共役ジエン共重合体を含んでなるゴム組成物。
- 請求項9記載のゴム組成物を用いて作製した空気入りタイヤ。
- 分枝共役ジエン化合物(1)の共重合比(l)が2.5~75重量%、ビニル化合物(3)の共重合比(n)が97.5~25重量%である請求項11記載の分枝共役ジエン共重合体。
- 分枝共役ジエン化合物(1)を共役ジエン化合物(2)で置き換えた同一の重量平均分子量の重合体との比較において、ムーニー粘度ML1+4(130℃)が低いものである、加工性改善用の、請求項11または12記載の分枝共役ジエン共重合体。
- 分枝共役ジエン化合物(1)が、ミルセンおよび/またはファルネセンである請求項11~13のいずれか1項に記載の分枝共役ジエン共重合体。
- ビニル化合物(3)が、スチレン、α-メチルスチレン、α-ビニルナフタレンおよびβ-ビニルナフタレンからなる群から選択される1種または2種以上である請求項11~14のいずれか1項に記載の分枝共役ジエン共重合体。
- 請求項11~15のいずれか1項に記載の分枝共役ジエン共重合体を含んでなるゴム組成物。
- 請求項16記載のゴム組成物を用いて作製した空気入りタイヤ。
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Also Published As
Publication number | Publication date |
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EP2824116B1 (en) | 2017-01-04 |
JP6007240B2 (ja) | 2016-10-12 |
EP2824116A4 (en) | 2015-12-16 |
JP6167208B2 (ja) | 2017-07-19 |
US20150031839A1 (en) | 2015-01-29 |
US20180265610A1 (en) | 2018-09-20 |
US10759885B2 (en) | 2020-09-01 |
JP2016196657A (ja) | 2016-11-24 |
JPWO2013132905A1 (ja) | 2015-07-30 |
US10040877B2 (en) | 2018-08-07 |
EP2824116A1 (en) | 2015-01-14 |
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