WO2017056767A1 - 空気入りタイヤ - Google Patents
空気入りタイヤ Download PDFInfo
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- WO2017056767A1 WO2017056767A1 PCT/JP2016/074005 JP2016074005W WO2017056767A1 WO 2017056767 A1 WO2017056767 A1 WO 2017056767A1 JP 2016074005 W JP2016074005 W JP 2016074005W WO 2017056767 A1 WO2017056767 A1 WO 2017056767A1
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- WIPO (PCT)
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- rubber
- mass
- parts
- polybutadiene
- pneumatic tire
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Classifications
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- 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
-
- 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
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- 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
- B60C1/0025—Compositions of the sidewalls
-
- 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
- C08F136/00—Homopolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds
- C08F136/02—Homopolymers 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
- C08F136/04—Homopolymers 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
- C08F136/06—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
- C08F36/06—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
- C08F4/00—Polymerisation catalysts
- C08F4/42—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors
- C08F4/44—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides
- C08F4/60—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides together with refractory metals, iron group metals, platinum group metals, manganese, rhenium technetium or compounds thereof
- C08F4/70—Iron group metals, platinum group metals or compounds thereof
-
- 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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L7/00—Compositions of natural rubber
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- 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 pneumatic tire having a tire member manufactured using a rubber composition for a tire containing a predetermined polybutadiene.
- Polybutadiene generally has superior fuel efficiency performance but inferior processability as compared to other rubbers.
- fuel efficiency and processability are in a trade-off relationship, and if one is to be improved, the other's performance is reduced, so various improvements have been made.
- Patent Document 1 For example, by defining the ratio (Tcp / ML) of 5% toluene solution viscosity (Tcp) to Mooney viscosity (ML) of polybutadiene synthesized using a cobalt catalyst, a tire having both fuel efficiency and processability made compatible Polybutadiene compositions have been reported (Patent Document 1).
- the Mooney viscosity rate dependence index (n value) is An attempt is made to make fuel efficiency and processability more compatible by specifying (patent documents 2 and 3).
- the tire composition has a rubber composition in which carbon black is blended with a rubber component blended with natural rubber exhibiting excellent tensile strength and tear strength and butadiene rubber exhibiting improvement effect on flex crack growth resistance.
- a rubber composition in which carbon black is blended with a rubber component blended with natural rubber exhibiting excellent tensile strength and tear strength and butadiene rubber exhibiting improvement effect on flex crack growth resistance.
- butadiene rubber is blended to improve flex crack resistance performance, and further, weather resistance and reinforcement are improved. Carbon black has been used to do this.
- the fuel consumption of a car has been reduced by reducing the rolling resistance of the tire.
- the demand for lower fuel consumption of vehicles has been increasingly strong, and excellent fuel consumption performance is required not only for tread rubber compositions but also for clinch rubber compositions.
- the method of reducing content of fillers such as carbon black and a silica
- a method of satisfying the fuel consumption performance of a rubber composition there is a problem that the strength of the rubber composition is lowered and the abrasion resistance is deteriorated.
- Patent Document 4 discloses a rubber composition capable of improving fuel efficiency by blending silica having different particle diameters. However, there is still room for improvement in low heat buildup.
- an object of this invention is to provide the pneumatic tire which has a tire member produced using the rubber composition excellent in workability and tire characteristics.
- the present invention [1] (A) Mooney viscosity (ML 1 + 4, 100 ° C. ) 43 to 70, (B) The ratio (Tcp / ML 1 + 4,100 ° C. ) of the 5% by mass toluene solution viscosity (Tcp) to the Mooney viscosity (ML 1 + 4,100 ° C. ) is 0.9 to 1.7, (C) Assuming that the torque at the end of the ML 1 + 4, 100 ° C.
- the tire member is a clinch
- the rubber reinforcing material (c) contains silica having a CTAB specific surface area of 180 m 2 / g or more and a BET specific surface area of 185 m 2 / g or more according to any one of [1] to [6] Pneumatic tire, [13]
- the content of the silica is 1 to 150 with respect to 100 parts by mass of the rubber component (a) + (b) consisting of 5 to 90 parts by mass of the polybutadiene (a) and 95 to 10 parts by mass of the other rubber (b).
- the pneumatic tire according to [12] which is in parts by mass, About.
- the pneumatic tire which has a tire member produced using the rubber composition excellent in processability and tire characteristics can be provided.
- Polybutadiene The polybutadiene used in the present invention has the following characteristics.
- Mooney viscosity (ML 1 + 4, 100 ° C. ) is 43 to 70.
- the Mooney viscosity (ML 1 + 4, 100 ° C. ) is more preferably 48 to 70, and still more preferably 50 to 65.
- ML 1 + 4, 100 ° C is less than 43, the abrasion resistance tends to deteriorate.
- ML 1 + 4, 100 ° C. exceeds 70, processability tends to deteriorate.
- Tcp / ML 1 + 4, 100 ° C. The ratio (Tcp / ML 1 + 4, 100 ° C. ) of the 5 mass% toluene solution viscosity (Tcp) to the Mooney viscosity (ML 1 + 4, 100 ° C. ) is 0.9 to 1.7.
- Tcp / ML 1 + 4, 100 ° C. is preferably 1.2 to 1.7, and more preferably 1.4 to 1.7.
- Tcp / ML 1 + 4, 100 ° C. is an index of the degree of branching, and if Tcp / ML 1 + 4, 100 ° C. is smaller than 0.9, the degree of branching is too large and the wear resistance is lowered. On the other hand, if Tcp / ML 1 + 4, 100 ° C.
- the 5 mass% toluene solution viscosity (Tcp) and the Mooney viscosity (ML 1 + 4, 100 ° C. ) are measured by the method described in the examples described later.
- the stress relaxation time (T80) until the value attenuates by 80% is 10.0 to 40.0 seconds.
- T80 is preferably 11.0 to 26.0 seconds, and more preferably 12.0 to 20.0 seconds. If T80 is less than 10.0 seconds, the entanglement of rubber molecules is small and the retention of shear stress is insufficient, so it is difficult to obtain a good filler dispersion state. On the other hand, if T80 is greater than 40.0 seconds, residual stress during molding increases, so dimensional stability deteriorates and workability decreases.
- stress relaxation time (T80) is measured by the method described in the manufacture example mentioned later. The transition of stress relaxation of rubber is determined by the combination of the elastic component and the viscosity component, and the slow stress relaxation indicates that the elastic component is large, and the fast stress relaxation indicates the large viscosity component.
- Mw / Mn Molecular weight distribution
- the Mw / Mn is preferably 2.60 to 3.60, more preferably 2.70 to 3.20.
- Mw / Mn is less than 2.50, the processability is reduced.
- Mw / Mn is larger than 4.00, the abrasion resistance is reduced.
- a number average molecular weight (Mn), a weight average molecular weight (Mw), and molecular weight distribution (Mw / Mn) are measured by the method described in the Example mentioned later.
- (E) weight average molecular weight (Mw) is preferably 40.0 ⁇ 10 4 to 75.0 ⁇ 10 4 , and 46.0 ⁇ 10 4 to 65.0 ⁇ more preferably 10 4, more preferably from 52.0 ⁇ 10 4 ⁇ 62.0 ⁇ 10 4. Wear resistance is further improved by setting Mw to 40.0 ⁇ 10 4 or more. On the other hand, processability improves more by Mw being 75.0x10 4 or less.
- the proportion of the cis structure in (F) microstructural analysis is preferably 98 mol% or less, more preferably 94.0 to 97.8 mol%, and 95. More preferably, it is 0 to 97.6 mol%.
- the ratio of the cis structure in the microstructural analysis is 98 mol% or less, it has sufficient branched polymer chains, and it is easy to obtain the required stress relaxation time.
- the proportion of cis structure in the microstructural analysis is too small, the abrasion resistance tends to decrease.
- the ratio of a micro structure is measured by the method described in the Example mentioned later.
- the toluene solution viscosity (Tcp) is preferably 42 to 160, more preferably 55 to 135, and still more preferably 68 to 120. Wear resistance is further improved by setting Tcp to 42 or more. On the other hand, by setting Tcp to 160 or less, processability is further improved.
- the number average molecular weight (Mn) is preferably 12.5 ⁇ 10 4 to 30.0 ⁇ 10 4 and 16.0 ⁇ 10 4 to 23.0 ⁇ 10 4 Is more preferable, and 17.0 ⁇ 10 4 to 20.3 ⁇ 10 4 is more preferable.
- Mn number average molecular weight
- the proportion of the vinyl structure in the microstructural analysis is preferably 2 mol% or less, more preferably 1.8 mol% or less.
- the proportion of the vinyl structure in the microstructural analysis is preferably as small as possible, but may be, for example, 1.0 mol% or more.
- the proportion of the trans structure in the microstructural analysis is preferably 2.0 mol% or less, more preferably 1.6 mol% or less, and 1.3 mol% or less Is more preferred.
- the proportion of the trans structure in the microstructural analysis is preferably as small as possible, but may be, for example, 1.0 mol% or more.
- the polybutadiene may or may not be modified with disulfur dichloride, monosulfur monochloride, other sulfur compounds, organic peroxides, t-butyl chloride, etc. .
- the polybutadiene used in the present invention can be produced by a catalyst system comprising a transition metal catalyst, an organoaluminum compound, and water.
- a cobalt catalyst is suitable as the transition metal catalyst.
- cobalt salts such as cobalt chloride, cobalt bromide, cobalt nitrate, cobalt octylate (ethylhexanoate), cobalt naphthenate, cobalt acetate, cobalt acetate, cobalt malonate, etc .; cobalt bis acetylacetonate, cobalt tris acetyl acetonate
- organic base complexes such as acetoacetic acid ethyl ester cobalt, pyridine complexes of cobalt salts and picoline complexes, and ethyl alcohol complexes.
- cobalt octylate ethylhexanoic acid
- other catalysts such as neodymium catalyst and nickel catalyst can also be used.
- the amount of transition metal catalyst used can be appropriately adjusted to obtain a polybutadiene having a desired Mooney viscosity.
- organoaluminum compound halogen containing organoaluminum compounds such as trialkylaluminum; dialkylaluminum chloride, dialkylaluminum bromide, alkylaluminum sesquichloride, alkylaluminum sesquibromide, alkylaluminum dichloride, alkylaluminum dibromide, etc .; dialkylaluminum hydride, alkylaluminum Examples thereof include hydrogenated organic aluminum compounds such as sesquihydrite.
- the organoaluminum compounds can be used alone or in combination of two or more.
- trialkylaluminum examples include trimethylaluminum, triethylaluminum, triisobutylaluminum, trihexylaluminum, trioctylaluminum, tridecylaluminum and the like.
- dialkylaluminum chlorides include dimethylaluminum chloride and diethylaluminum chloride.
- dialkylaluminum bromide dimethylaluminum bromide, diethylaluminum bromide and the like can be mentioned.
- alkylaluminum sesquichloride include methylaluminum sesquichloride, ethylaluminum sesquichloride and the like.
- alkylaluminum sesquibromide include methylaluminum sesquibromide, ethylaluminum sesquibromide and the like.
- alkylaluminum dichloride include methylaluminum dichloride and ethylaluminum dichloride.
- alkylaluminum dibromide methylaluminum dibromide, ethylaluminum dibromide and the like can be mentioned.
- dialkyl aluminum hydrides include diethyl aluminum hydride and diisobutyl aluminum hydride.
- alkyl aluminum sesquihydrate examples include ethyl aluminum sesquihydride and isobutyl aluminum sesquihydride.
- the mixing ratio of the organoaluminum compound to water is preferably 1.5 to 3 in terms of aluminum / water (molar ratio), since a polybutadiene having a desired T80 can be easily obtained. More preferably, it is 5.
- non-conjugated dienes such as cyclooctadiene, allene, methyl allene (1,2-butadiene) and the like; ⁇ -olefins such as ethylene, propylene, 1-butene and the like
- Molecular weight regulators can also be used.
- a molecular weight modifier can be used individually by 1 type, and can also be used together 2 or more types.
- the polymerization method is not particularly limited, and bulk polymerization (bulk polymerization) in which a monomer is polymerized while using a conjugated diene compound monomer such as 1,3-butadiene as a polymerization solvent, or solution polymerization in which a monomer is dissolved in a solvent Etc. can be applied.
- bulk polymerization bulk polymerization
- a conjugated diene compound monomer such as 1,3-butadiene
- solution polymerization in which a monomer is dissolved in a solvent Etc.
- aromatic hydrocarbons such as toluene, benzene and xylene; saturated aliphatic hydrocarbons such as n-hexane, butane, heptane and pentane; alicyclic hydrocarbons such as cyclopentane and cyclohexane; Olefin-based hydrocarbons such as cis-2-butene and trans-2-butene; petroleum-based solvents such as mineral spirit, solvent naphtha and kerosene; halogenated hydrocarbons such as methylene chloride and the like.
- toluene, cyclohexane, or a mixed solvent of cis-2-butene and trans-2-butene is preferably used.
- the polymerization temperature is preferably in the range of ⁇ 30 to 150 ° C., more preferably in the range of 30 to 100 ° C., and further preferably 70 to 80 ° C. because a polybutadiene having a desired T80 can be easily obtained.
- the polymerization time is preferably in the range of 1 minute to 12 hours, and more preferably in the range of 5 minutes to 5 hours.
- an antiaging agent can be added as needed.
- anti-aging agents include phenolic anti-aging agents such as 2,6-di-t-butyl-p-cresol (BHT), phosphorus anti-aging agents such as torinonyl phenyl phosphite (TNP), and 4,6 And sulfur based antioxidants such as -bis (octylthiomethyl) -o-cresol and dilauryl-3,3'-thiodipropionate (TPL).
- An antiaging agent can be used individually by 1 type, and can also be used together 2 or more types.
- the addition amount of the antioxidant is preferably 0.001 to 5 parts by mass with respect to 100 parts by mass of polybutadiene.
- the inside of the polymerization tank is depressurized as necessary, and further post-treatments such as washing and drying steps can be performed to produce a polybutadiene having desired properties.
- Rubber composition for tire The rubber composition for a tire of the present invention comprises the above polybutadiene (A), another rubber (B) and a rubber reinforcing material (C).
- a diene rubber other than polybutadiene having the above-mentioned properties can be used.
- diene-based rubbers other than polybutadiene having the above-mentioned properties include polybutadiene rubber, natural rubber, high-cis polybutadiene rubber, low-cis polybutadiene rubber (BR), syndiotactic-1,2-polybutadiene-containing butadiene rubber VCR), polymers of diene-based monomers such as isoprene rubber, butyl rubber and chloroprene rubber; acrylonitrile-diene copolymer rubbers such as acrylonitrile butadiene rubber (NBR), nitrile chloroprene rubber and nitrile isoprene rubber; emulsion polymerization or solution polymerization styrene butadiene rubber And styrene-diene copolymer rubbers such as (SBR), st
- butadiene rubber natural rubber, syndiotactic-1,2-polybutadiene-containing butadiene rubber, isoprene rubber, acrylonitrile butadiene rubber, and styrene butadiene rubber which do not have the above characteristics are preferable.
- solution polymerized styrene butadiene rubber (s-SBR), natural rubber or isoprene rubber is suitable.
- the other rubber component (b) can be used alone or in combination of two or more.
- the styrene content of the SBR is preferably 30% by mass or more, more preferably 35% by mass or more, and still more preferably 37% by mass or more, because the effects of the present invention are further exhibited.
- the styrene content of the SBR is preferably 50% by mass or less, more preferably 45% by mass or less, and still more preferably 42% by mass or less from the viewpoint of fuel economy and abrasion resistance.
- the styrene content of SBR is calculated by 1 H-NMR measurement.
- the Mooney viscosity (ML 1 +4, 100 ° C. ) of SBR is preferably 35 to 75, and more preferably 37 to 65.
- processability, rubber strength, low fuel consumption, wear resistance, and crack extension resistance can be improved in a well-balanced manner.
- the method for preparing SBR is not particularly limited, and one skilled in the art can easily prepare SBR having the above characteristics if the above-mentioned desired characteristics of SBR are determined.
- the content in the rubber component is preferably 10% by mass or more, more preferably 20% by mass or more, from the viewpoints of rubber strength, low fuel consumption, abrasion resistance, and crack extension resistance. % Or more is more preferable, 40% by mass or more is particularly preferable, 50% by mass or more is the most preferable, and 60% by mass or more is the most preferable.
- the content of SBR is preferably 80% by mass or less, and more preferably 75% by mass or less, from the viewpoints of processability, rubber strength, fuel economy, and abrasion resistance.
- Inorganic reinforcing materials such as carbon black, white carbon (silica), activated calcium carbonate, ultrafine particle magnesium silicate etc. as a rubber reinforcing material (c); polyethylene resin, polypropylene resin, high styrene resin, phenol resin, lignin, modified melamine And organic reinforcing materials such as resin, coumarone-indene resin, petroleum resin and the like. Among them, carbon black or silica is preferable.
- the rubber reinforcing materials may be used alone or in combination of two or more.
- the nitrogen adsorption specific surface area (N 2 SA) of carbon black is usually 5 to 200 m 2 / g, the lower limit is preferably 50 m 2 / g, and the upper limit is preferably 150 m 2 / g.
- the dibutyl phthalate (DBP) absorption of carbon black is usually 5 to 300 ml / 100 g, the lower limit is preferably 80 ml / 100 g, and the upper limit is preferably 180 ml / 100 g.
- the content relative to 100 parts by mass of the rubber component in the case of containing carbon black is preferably 3 parts by mass or more, more preferably 10 parts by mass or more, and still more preferably 15 parts by mass or more from the viewpoint of weatherability and colorability. Further, from the viewpoint of low fuel consumption, 70 parts by mass or less is preferable, 60 parts by mass or less is more preferable, and 50 parts by mass or less is more preferable.
- the silica is not particularly limited, and silica conventionally used for tire members can be used. Among them, when the tire member produced using the rubber composition is clinch, the CTAB specific surface area is 180 m 2 / g or more, and the BET specific surface area is 185 m 2 because the fuel consumption and abrasion resistance are excellent. It is preferable to use fine particle silica of 1 g / g or more.
- the CTAB (cetyltrimethyl ammonium bromide) specific surface area of fine particle silica is preferably 190 m 2 / g or more, more preferably 195 m 2 / g or more, still more preferably 197 m 2 / g or more from the viewpoint of mechanical strength and abrasion resistance. It is.
- the CTAB specific surface area is preferably 600 m 2 / g or less, more preferably 300 m 2 / g or less, and still more preferably 250 m 2 / g or less from the viewpoint of dispersibility.
- the CTAB specific surface area is measured in accordance with ASTM D 3765-92.
- the BET specific surface area of the particulate silica is preferably 190 m 2 / g or more, more preferably 195 m 2 / g or more, and still more preferably 210 m 2 / g or more from the viewpoint of mechanical strength and abrasion resistance.
- the BET specific surface area is preferably 600 m 2 / g or less, more preferably 300 m 2 / g or less, and still more preferably 260 m 2 / g or less, from the viewpoint of dispersibility.
- the BET specific surface area of silica is measured according to ASTM D3037-81.
- the aggregate size of the particulate silica is 30 nm or more, preferably 35 nm or more, more preferably 40 nm or more, still more preferably 45 nm or more, particularly preferably 50 nm or more, and most preferably 55 nm or more.
- the aggregate size is preferably 100 nm or less, more preferably 80 nm or less, still more preferably 70 nm or less, particularly preferably 65 nm or less.
- the aggregate size is also referred to as aggregate diameter or maximum frequency Stokes equivalent diameter, and the particle diameter when a single silica particle is considered to be a silica aggregate composed of a series of primary particles. Is equivalent to The aggregate size can be measured, for example, using a disk centrifugal sedimentation type particle size distribution measuring apparatus such as BI-XDC (manufactured by Brookhaven Instruments Corporation).
- a suspension is prepared by placing 3.2 g of silica and 40 ml of deionized water in a 50 ml tall beaker and placing the beaker containing the suspension in an ice-filled crystallizer.
- the sample is prepared by disintegrating the suspension for 8 minutes using a beaker with an ultrasound probe (1500 watts, 1.9 cm VI BRACELL ultrasound probe (Bioblock, used at 60% of maximum power)).
- a 15 ml sample is introduced into the disc, stirred and measured under conditions of fixed mode, analysis time 120 minutes, density 2.1.
- the average primary particle size of the particulate silica is preferably 25 nm or less, more preferably 22 nm or less, still more preferably 17 nm or less, and particularly preferably 14 nm or less.
- the lower limit of the average primary particle size is not particularly limited, but is preferably 3 nm or more, more preferably 5 nm or more, and still more preferably 7 nm or more.
- the average primary particle diameter of fine particle silica can be obtained by observing 400 or more primary particles of silica observed in a field of view by observation with a transmission type or a scanning electron microscope.
- the D50 of the particulate silica is preferably 7.0 ⁇ m or less, more preferably 5.5 ⁇ m or less, still more preferably 4.5 ⁇ m or less from the viewpoint of dispersibility.
- D50 of the fine particle silica is preferably 2.0 ⁇ m or more, more preferably 2.5 ⁇ m or more, and still more preferably 3.0 ⁇ m or more from the viewpoint of dispersibility.
- D50 is the median diameter of the particulate silica, and 50% by mass of the particles are smaller than the median diameter.
- the proportion of particles having a particle diameter of greater than 18 ⁇ m is preferably 6% by mass or less, more preferably 4% by mass or less, and still more preferably 1.5% by mass or less.
- D50 of fine particle silica and the ratio of silica having a predetermined particle diameter are measured by the following method.
- the aggregation of the aggregates is assessed by carrying out granulometry (using laser diffraction) on a suspension of previously sonicated silica. In this method, the degradability of silica (0.1 to several tens of ⁇ m of silica) is measured. Ultrasonic digestion is performed using a Bioblock VIBRACELL acoustic generator (600 W) (used at 80% of maximum power) equipped with a 19 mm diameter probe. Particle size measurements are made by laser diffraction on a Mohrburn Mastersizer 2000 particle size analyzer.
- the pore distribution width W of the pore volume of the particulate silica is preferably 0.3 or more, more preferably 0.7 or more, still more preferably 1.0 or more, particularly preferably 1.3 or more, and most preferably 1. 5 or more.
- the pore distribution width W is preferably 5.0 or less, more preferably 4.5 or less, still more preferably 4.0 or less, particularly preferably 3.0 or less, most preferably 2.0 or less. .
- Such a broad porous distribution can improve the dispersibility of the silica to obtain the desired performance.
- the pore distribution width W of the pore volume of silica can be measured by the following method.
- the pore volume of the particulate silica is measured by mercury porosimetry.
- a sample of silica is predried in an oven at 200 ° C. for 2 hours, then placed in the test vessel within 5 minutes after being removed from the oven and vacuumed.
- the pore diameter (AUTOPORE III 9420 powder engineering porosimeter) is calculated by the Washburn equation with a contact angle of 140 ° and a surface tension ⁇ of 484 dynes / cm (or N / m).
- the pore distribution width W corresponds to (Xa ⁇ Xb) / Xs, where Xa and Xb denote the abscissas (nm) of the points a and b, respectively (Xa> Xb).
- the diameter Xs (nm) giving the peak value Ys of the pore volume in the pore distribution curve of the fine particle silica is preferably 10 nm or more, more preferably 15 nm or more, still more preferably 18 nm or more, particularly preferably 20 nm or more Also, it is preferably 60 nm or less, more preferably 35 nm or less, still more preferably 28 nm or less, particularly preferably 25 nm or less. If it is in the said range, the particulate silica excellent in dispersibility and reinforcement can be obtained.
- the compounding amount of the fine particle silica is preferably 10 parts by mass or more, more preferably 15 parts by mass or more, still more preferably 20 parts by mass or more, particularly preferably 35 parts by mass or more, most preferably 100 parts by mass of the rubber component Is 40 parts by mass or more. If the amount is less than 10 parts by mass, sufficient reinforcement, mechanical strength, and abrasion resistance may not be obtained.
- the compounding amount of the fine particle silica is preferably 150 parts by mass or less, more preferably 100 parts by mass or less, still more preferably 80 parts by mass or less, and particularly preferably 70 parts by mass or less. If the amount is more than 150 parts by mass, the processability may be deteriorated, and it may be difficult to ensure good dispersibility.
- the rubber composition of the present invention may contain silica other than the fine particle silica (c).
- the total content of silica is preferably 20 parts by mass or more, more preferably 30 parts by mass or more, still more preferably 35 parts by mass or more, and most preferably 40 parts by mass or more with respect to 100 parts by mass of the rubber component. is there.
- the total content is preferably 150 parts by mass or less, more preferably 120 parts by mass or less, still more preferably 100 parts by mass or less, particularly preferably 80 parts by mass or less, and most preferably 50 parts by mass or less. In the case of less than the lower limit or in the case of exceeding the upper limit, there is a tendency similar to the above-mentioned blending amount of fine particle silica.
- the total content with respect to 100 parts by mass of the rubber component in the case of containing silica (fine particle silica and silica other than fine particle silica) and carbon black is preferably 25 parts by mass or more, more preferably 30 parts by mass or more from the viewpoint of reinforcement. 35 parts by mass or more is more preferable, and 40 parts by mass or more is particularly preferable. Further, the total content is preferably 150 parts by mass or less, more preferably 100 parts by mass or less, still more preferably 80 parts by mass or less, particularly preferably 60 parts by mass or less, from the viewpoint of dispersibility and processability. The following is most preferable, and 48 parts by mass or less is most preferable.
- the blending ratio of the above components is 5 to 90 parts by mass of the polybutadiene (i) of the present invention and 95 to 10 parts of the other rubber (ii)
- the amount of the rubber reinforcing material (c) is preferably 1 to 100 parts by mass with respect to 100 parts by mass of the rubber component (b) + (b) consisting of parts.
- the rubber component (i) + (ii) is more preferably 10 to 60 parts by mass of polybutadiene (i) and 90 to 40 parts by mass of the other rubber (ii), and 20 to 50 parts by mass of polybutadiene (i) More preferably, it comprises 80 to 50 parts by mass of other rubber (ii).
- the amount of the rubber reinforcing material (c) is more preferably 30 to 90 parts by mass and still more preferably 50 to 80 parts by mass with respect to 100 parts by mass of the rubber component (b) + (b).
- the blending ratio of the above components is 5 to 90 parts by mass of the polybutadiene (i) of the present invention and other rubbers ( B) It is preferable that it is 1 to 130 parts by mass of the rubber reinforcing material (c) with respect to 100 parts by mass of the rubber component (b) + (b) consisting of 95 to 10 parts by mass.
- the rubber component (i) + (ii) more preferably comprises 10 to 60 parts by mass of polybutadiene (i) and 90 to 40 parts by mass of the other rubber (ii), and 20 to 40 parts by mass of polybutadiene (i) More preferably, it comprises 80 to 60 parts by mass of the other rubber (ii).
- the amount of the rubber reinforcing material (c) is more preferably 20 to 80 parts by mass and still more preferably 30 to 60 parts by mass with respect to 100 parts by mass of the rubber component (b) + (b).
- the blending ratio of the above components is 5 to 90 parts by weight of the polybutadiene (i) of the present invention and 95 to 10 parts by weight of the other rubber (ii) It is preferable that it is 1 to 150 parts by weight of the rubber reinforcing material (c) with respect to 100 parts by weight of the rubber component (b) + (b) consisting of
- the rubber component (i) + (ii) more preferably comprises 10 to 60 parts by weight of polybutadiene (i) and 90 to 40 parts by weight of the other rubber (ii), and 20 to 40 parts by weight of polybutadiene (i) More preferably, it comprises 80 to 60 parts by weight of other rubber (ii).
- the amount of the rubber reinforcing agent (c) is more preferably 30 to 100 parts by weight, still more preferably 35 to 60 parts by weight, per 100 parts by weight of the rubber component (b) + (b).
- the rubber composition according to the present invention can be obtained by kneading the above-mentioned components using a commonly used Banbury, open roll, kneader, twin-screw kneader or the like.
- a silane coupling agent if necessary, a silane coupling agent, a vulcanizing agent, a vulcanization accelerator, an antiaging agent, fillers other than the aforementioned carbon black and silica, process oil, zinc flower, Ingredients commonly used in the rubber industry such as stearic acid may be kneaded.
- silane coupling agent a silane coupling agent having a functional group capable of reacting with the above-mentioned polybutadiene (i) or other rubber component (ii) is particularly preferable.
- a silane coupling agent can be used individually by 1 type, and can also be used together 2 or more types.
- silane coupling agent conventionally known silane coupling agents can be used.
- silane coupling agents can be used.
- bis (3-triethoxysilylpropyl) tetrasulfide and bis (3-triethoxysilylpropyl) disulfide are preferable from the viewpoint of good processability.
- These silane coupling agents may be used alone or in combination of two or more.
- the content of the silane coupling agent relative to 100 parts by mass of silica is preferably 2 parts by mass or more, more preferably 4 parts by mass or more, and still more preferably 6 parts by mass or more from the viewpoint of fuel economy. If the amount is less than 2 parts by mass, the rolling resistance reduction effect (the improvement effect of the fuel efficiency) may not be sufficiently obtained.
- the content is preferably 15 parts by mass or less, more preferably 12 parts by mass or less, and still more preferably 10 parts by mass or less because an effect corresponding to the content can not be obtained.
- vulcanizing agent known vulcanizing agents such as sulfur, organic peroxides, resin vulcanizing agents, metal oxides such as magnesium oxide and the like are used. Vulcanizing agents can be used alone or in combination of two or more.
- vulcanization accelerator known vulcanization auxiliary agents such as aldehydes, ammonias, amines, guanidines, thioureas, thiazoles, thiurams, dithiocarbamates, xanthates and the like are used. Vulcanization accelerators can be used alone or in combination of two or more.
- anti-aging agent examples include amines and ketone based anti-aging agents, imidazole based anti-aging agents, amine based anti-aging agents, phenolic anti-aging agents, sulfur based anti-aging agents, and phosphorus based anti-aging agents.
- An antiaging agent can be used individually by 1 type, and can also be used together 2 or more types.
- fillers other than carbon black and silica inorganic fillers such as calcium carbonate, basic magnesium carbonate, clay, lisage, diatomaceous earth and the like; organic fillers such as regenerated rubber and powder rubber can be mentioned.
- the said filler can also be used individually by 1 type, and can also be used together 2 or more types.
- process oil any of aromatic process oil, naphthene process oil and paraffin process oil may be used. Also, low molecular weight liquid polybutadiene or tackifier may be used.
- the process oils may be used alone or in combination of two or more.
- the rubber composition of the present invention is a rubber composition excellent in processability and tire characteristics, and therefore, each component (tread (one-layer structure) of a tire, a surface layer of a two-layer tread (cap tread) ), Inner layer (base tread), sidewalls, carcass, belt, bead, etc.).
- the pneumatic tire of the present invention is manufactured by the usual method using the above rubber composition. That is, according to the shape of each tire member at the unvulcanized stage, the rubber composition in which the above-mentioned various compounding agents are compounded is extruded according to the shape of each tire member, and, together with other tire members, An unvulcanized tire is formed by molding by a method. By heating and pressing this unvulcanized tire in a vulcanizer, the pneumatic tire of the present invention is obtained.
- the tread of the multilayer structure is manufactured by a method of bonding sheet-like ones in a predetermined shape, or a method of charging two or more extruders and forming two or more layers at an outlet of the extruder. can do.
- the pneumatic tire according to the present invention is suitably used as a passenger car tire, a truck / bus tire, a two-wheeled vehicle tire, a competition tire or the like, and particularly suitably used as a passenger car tire.
- a rubber composition was produced using the obtained polybutadiene.
- a laboplast mill manufactured by Toyo Seiki Seisakusho Co., Ltd.
- SBR styrene butadiene rubber
- silica manufactured by Evonik Degussa, trade name: Ultrasil 7000GR
- si75 a silane coupling agent
- the obtained kneaded product was cooled by a 6-inch roll and allowed to cool, and then remilled again. Furthermore, in the kneaded product, 1.7 parts by mass of a first vulcanization accelerator (manufactured by Ouchi Shinko Chemical Co., Ltd., trade name: Noxceler CZ (CBS)), and 2 parts by mass of a second vulcanization Promoter (manufactured by Ouchi Shinko Chemical Co., Ltd., trade name: Noxceler D (DPG)) and 1.4 parts by mass of a vulcanizing agent (powder sulfur, manufactured by Tsurumi Chemical Co., Ltd.) in 6-inch rolls
- a first vulcanization accelerator manufactured by Ouchi Shinko Chemical Co., Ltd., trade name: Noxceler CZ (CBS)
- a second vulcanization Promoter manufactured by Ouchi Shinko Chemical Co., Ltd., trade name: Noxceler D (DPG)
- the vulcanization time was twice as long as the 160 ° C. vulcanization characteristic t90 determined by a viscoelasticity measuring apparatus (manufactured by Alpha Technologies, trade name: RPA 2000).
- Production Examples 2 to 10 Blends and a rubber composition were prepared in the same manner as in Production Example 1 except that the raw material blend ratio and the polymerization temperature were changed as shown in Table 1.
- Diethylaluminum chloride (DEAC) and triethylaluminum (TEA) were used in combination as the organoaluminum compound.
- Example 1 The procedure of Example 1 was repeated except that a commercially available polybutadiene (manufactured by Ube Industries, Ltd., trade name: BR150L) was used.
- a commercially available polybutadiene manufactured by Ube Industries, Ltd., trade name: BR150L
- Example 3 The procedure of Example 1 was repeated except that a commercially available polybutadiene (trade name: BR710, manufactured by Ube Industries, Ltd.) was used.
- a commercially available polybutadiene (trade name: BR710, manufactured by Ube Industries, Ltd.) was used.
- Tcp 5% by mass toluene solution viscosity (Tcp)
- the viscosity (Tcp) of a 5% by mass toluene solution of polybutadiene was determined by dissolving 2.28 g of the polymer in 50 ml of toluene, Measured at 25 ° C. using 400.
- the viscometer calibration standard solution JIS Z 8809
- Mooney viscosity (ML 1 + 4, 100 ° C ) The Mooney viscosity (ML 1 +4, 100 ° C. ) of the polybutadiene and the composition was measured at 100 ° C. in accordance with JIS K 6300. In addition, about ML 1 + 4, 100 degreeC of a compound, the index which set the comparative example 1 to 100 was calculated ( ML1 + 4, 100 degreeC of a compound is small, and workability becomes favorable, so that an index is large).
- Stress relaxation time (T80) The stress relaxation time (T80) of the polybutadiene and the composition was calculated by stress relaxation measurement according to ASTM D1646-7. Specifically, the torque is 100% when the rotor is stopped (0 seconds) after 4 minutes of measurement under the condition of ML 1 + 4, 100 ° C. , and the value attenuates to 80% (that is, attenuates to 20%) The time (in seconds) up to) was measured as a stress relaxation time T80.
- the number average molecular weight (Mn), weight average molecular weight (Mw), and molecular weight distribution (Mw / Mn) of polybutadiene were calculated in terms of standard polystyrene by GPC method (manufactured by Tosoh Corp., trade name: HLC-8220) .
- GPC method manufactured by Tosoh Corp., trade name: HLC-8220
- tetrahydrofuran was used, two columns of KF-805L (trade name) manufactured by Shodex were connected in series, and a detector was a suggestion refractometer (RI).
- microstructure of the polybutadiene was calculated by infrared absorption spectroscopy. Specifically, the peak position derived from the microstructure (cis: 740cm -1, vinyl: 910cm -1, trans: 967cm -1) from the absorption intensity ratio was calculated microstructure of the polymer.
- NR RSS # 3 (Tg: -60 ° C)
- BR1 Polybutadiene BR2 of Production Example 2: BR150L manufactured by Ube Industries, Ltd.
- BR3 BR710 manufactured by Ube Industries, Ltd.
- SBR 1 Nipol NS116 manufactured by Nippon Zeon Co., Ltd. (solution-polymerized SBR modified with N-methylpyrrolidone at an end, styrene content: 21% by mass, Tg: -25 ° C)
- SBR 2 Nipol 1502 (Styrene content: 23.5% by mass, Mooney viscosity: 52) manufactured by Nippon Zeon Co., Ltd.
- SBR 3 Nipol 1739 (Styrene content: 40.0 mass%, Mooney viscosity: 49) manufactured by Nippon Zeon Co., Ltd.
- Silica 1 Ultrasil VN3 (N 2 SA: 175 m 2 / g) manufactured by Evonik Degussa
- Silica 2 Zeosil 1115 MP (CTAB specific surface area: 105 m 2 / g, BET specific surface area: 115 m 2 / g, average primary particle diameter: 25 nm, aggregate size: 92 nm, pore distribution width W: 0.63) manufactured by Rhodia , Pore volume peak value in the pore distribution curve, diameter Xs: 60.3 nm)
- Silica 3 Zeosil Premium 200 MP (CTAB specific surface area: 200 m 2 / g, BET specific surface area: 220 m 2 / g, average primary particle size: 10 nm, aggregate size: 65 nm, D50: 4.2 ⁇ m, over 18 ⁇
- Silane coupling agent Si69 (bis (3-triethoxysilylpropyl) tetrasulfide) manufactured by Evonik Degussa Wax: Sunknock N manufactured by Ouchi Shinko Chemical Co., Ltd.
- Anti-aging agent Ozonone 6C (N- (1,3-dimethylbutyl) -N'-phenyl-p-phenylenediamine) manufactured by Seiko Instruments Inc.
- Zinc oxide Zinc oxide stearic acid manufactured by Mitsui Mining & Smelting Co., Ltd .: Stearic acid "Niruka” manufactured by NOF Corporation
- Sulfur Powdered sulfur vulcanization accelerator manufactured by Tsurumi Chemical Industry Co., Ltd.
- Vulcanization accelerator 1 Noccellar NS (N-t-butyl-2-benzothiazole sulfenamide) manufactured by Ouchi Emerging Chemical Industry Co., Ltd.
- Vulcanization accelerator 2 Noxceler CZ (N-cyclohexyl-2-benzothiazylsulfenamide) manufactured by Ouchi Shinko Chemical Co., Ltd.
- Vulcanization accelerator 3 Noxceler D (N, N'-diphenylguanidine) manufactured by Ouchi Shinko Chemical Co., Ltd.
- Example 1 and Comparative Examples 1 and 2 Using a Banbury mixer, materials other than the compounding amounts of sulfur and vulcanization accelerator shown in Table 3 were added, and kneaded for 5 minutes so that the discharge temperature was about 150 ° C. (base kneading step). Furthermore, sulfur and a vulcanization accelerator of compounding quantities shown in Table 3 are added to the obtained kneaded material, and it knead
- unvulcanized rubber composition was molded into a base tread shape, bonded to another tire member, and vulcanized at 170 ° C. for 20 minutes to produce a test tire.
- Mooney viscosity index Each unvulcanized rubber composition was measured at 100 ° C. according to the measurement method of Mooney viscosity in accordance with JIS K 6300. The larger the index, the better the processability.
- a vulcanized rubber sheet of silica and carbon dispersion index of 2 mm ⁇ 130 mm ⁇ 130 mm is prepared, and a test piece for measurement is cut out therefrom according to JIS K 6812 “Method for evaluating pigment dispersion or carbon dispersion of polyolefin pipe, joint and compound”.
- the aggregates of silica in each test piece were counted to calculate the dispersion rate (%), and the dispersion rate of Comparative Example 1 was set to 100, and the silica dispersion rate was displayed as an index.
- Silica / carbon dispersion index (dispersion ratio of each composition / dispersion ratio of comparative example 1) ⁇ 100
- a test piece of a predetermined size is cut out from the obtained vulcanized rubber sheet, and an initial strain of 10%, a dynamic strain of 2%, and a frequency of 10 Hz using a visco-elastic spectrometer manufactured by Ueshima Seisakusho Ltd.
- the loss tangent (tan ⁇ ) of the vulcanized rubber sheet at 60 ° C. was measured.
- the tan ⁇ of Comparative Example 1 was set to 100, and the index was displayed using the following formula (Fuel Efficiency Index). The larger the index, the better the fuel economy.
- (Fuel efficiency index) (tan ⁇ of Comparative Example 1) / (tan ⁇ of each composition) ⁇ 100
- the test tire was mounted on all wheels of a vehicle (domestic FF 2000 cc), and the vehicle was driven on a test course, and steering stability was evaluated by sensory evaluation of the driver. At that time, relative evaluation was performed with 10 points as full marks and the steering stability of Comparative Example 1 as 6 points. The larger the value is, the better the steering stability is.
- a pneumatic tire having a base tread member containing a predetermined polybutadiene according to the present invention and manufactured using a rubber composition excellent in processability and fuel efficiency is excellent in fuel efficiency and steering stability. I understand.
- Example 2 and Comparative Examples 3 and 4 Using a Banbury mixer, materials other than the compounding amounts of sulfur and vulcanization accelerator shown in Table 4 were added, and kneaded for 5 minutes so that the discharge temperature was about 150 ° C. (base kneading step). Furthermore, sulfur and a vulcanization accelerator of compounding quantities shown in Table 3 are added to the obtained kneaded material, and it knead
- unvulcanized rubber composition was molded into a sidewall shape, bonded to another tire member, and vulcanized at 170 ° C. for 20 minutes to produce a test tire.
- Mooney viscosity index Each unvulcanized rubber composition was measured at 100 ° C. according to the measurement method of Mooney viscosity in accordance with JIS K 6300. The larger the index, the better the processability.
- a test piece of a predetermined size is cut out from the obtained vulcanized rubber sheet, and an initial strain of 10%, a dynamic strain of 2%, and a frequency of 10 Hz using a visco-elastic spectrometer manufactured by Ueshima Seisakusho Ltd.
- the loss tangent (tan ⁇ ) of the vulcanized rubber sheet at 60 ° C. was measured.
- the tan ⁇ of Comparative Example 3 was set to 100, and the index was displayed using the following formula (Fuel Efficiency Index). The larger the index, the better the fuel economy.
- (Fuel efficiency index) (tan ⁇ of Comparative Example 3) / (tan ⁇ of each composition) ⁇ 100
- Demature flex crack growth test 1 million times for each vulcanized rubber sheet under conditions of temperature 23 ° C. and relative humidity 55% according to JIS K 6260 “Demature flex crack test method of vulcanized rubber and thermoplastic rubber” The crack length after the test, or the number of times for the growth to reach 1 mm was measured. Based on the obtained number of times and the crack length, the number of flexings until a 1 mm crack grows in the sample is represented by a common logarithm value, and further, the index is based on the common logarithm value of the comparative example 1 being 100. It expressed like.
- the test tire was mounted on all wheels of a vehicle (domestic FF 2000 cc), and the vehicle was driven on a test course, and steering stability was evaluated by sensory evaluation of the driver. At that time, relative evaluation was performed with 10 points as full marks and the steering stability of Comparative Example 3 as 6 points. The larger the value is, the better the steering stability is.
- the pneumatic tire having a sidewall member produced using the rubber composition containing the predetermined polybutadiene according to the present invention and having excellent processability, durability and fracture characteristics has durability, fracture characteristics and It turns out that steering stability is excellent.
- Example 3 and Comparative Examples 5 and 6 Using a Banbury mixer, materials other than the compounding amounts of sulfur and vulcanization accelerator shown in Table 5 were added, and kneaded for 5 minutes so that the discharge temperature was about 150 ° C. (base kneading step). Furthermore, sulfur and a vulcanization accelerator of compounding quantities shown in Table 3 are added to the obtained kneaded material, and it knead
- the above-mentioned unvulcanized rubber composition was molded into a tread (one-layer structure) shape, bonded to another tire member, and vulcanized at 170 ° C. for 20 minutes to produce a test tire.
- Mooney viscosity index Each unvulcanized rubber composition was measured at 100 ° C. according to the measurement method of Mooney viscosity in accordance with JIS K 6300. The larger the index, the better the processability.
- a vulcanized rubber sheet having a silica dispersion index of 2 mm ⁇ 130 mm ⁇ 130 mm is prepared, and a test piece for measurement is cut out therefrom, according to JIS K 6812 “Method for evaluating pigment dispersion or carbon dispersion of polyolefin pipe, joint and compound”
- the aggregates of silica in each test piece were counted to calculate the dispersion rate (%), and the dispersion rate of Comparative Example 5 was set to 100, and the silica dispersion rate was displayed as an index.
- Silica dispersion index (dispersion ratio of each composition / dispersion ratio of comparative example 5) ⁇ 100
- a test piece of a predetermined size is cut out from the obtained vulcanized rubber sheet, and an initial strain of 10%, a dynamic strain of 2%, and a frequency of 10 Hz using a visco-elastic spectrometer manufactured by Ueshima Seisakusho Ltd.
- the loss tangent (tan ⁇ ) of the vulcanized rubber sheet at 60 ° C. was measured.
- the tan ⁇ of Comparative Example 5 was set to 100, and the index was displayed using the following formula (Fuel Efficiency Index). The larger the index, the better the fuel economy.
- (Fuel efficiency index) (tan ⁇ of Comparative Example 5) / (tan ⁇ of each composition) ⁇ 100
- the grip performance was evaluated based on the braking performance obtained by the antilock brake system (ABS) evaluation test. That is, the test tire is mounted on a passenger car equipped with an ABS of 1800 cc class, and an asphalt road surface (wet road surface condition, skid number about 50) is allowed to travel on the vehicle, and brake is applied at 100 km / h.
- ABS antilock brake system
- the degree of deceleration is the distance until the passenger car stops.
- the wet grip performance index of the comparative example 5 was set to 100, and the deceleration of each mixing
- (Wet grip performance index) (deceleration of comparative example 5) / (deceleration of each composition) ⁇ 100
- Wear resistance test Wear test
- the manufactured test tire was attached to a car, and the amount of decrease in groove depth after traveling 8000 km in the city area was measured, and the travel distance when the groove depth decreased by 1 mm was calculated.
- the abrasion resistance index of the comparative example 5 was set to 100, and the reduction amount of the groove depth of each formulation was index-displayed by the following formula. The larger the wear resistance index, the better the wear resistance.
- (Abrasion resistance index) (travel distance when the groove depth is reduced by 1 mm for each composition) / (travel distance when the groove of the tire of Comparative Example 5 is reduced by 1 mm) ⁇ 100
- Examples 4 and 5 and Comparative Examples 7 to 10 Using a Banbury mixer, materials other than the compounding amounts of sulfur and vulcanization accelerator shown in Table 6 were added and kneaded for 5 minutes so that the discharge temperature was about 150 ° C. (base kneading step). Furthermore, sulfur and a vulcanization accelerator of compounding quantities shown in Table 3 are added to the obtained kneaded material, and it knead
- the above-mentioned unvulcanized rubber composition was formed into a tread (one-layer structure) shape, bonded to another tire member, and vulcanized at 170 ° C. for 15 minutes to produce a test tire.
- Mooney viscosity index Each unvulcanized rubber composition was measured at 100 ° C. according to the measurement method of Mooney viscosity in accordance with JIS K 6300. The larger the index, the better the processability.
- a vulcanized rubber sheet having a silica dispersion index of 2 mm ⁇ 130 mm ⁇ 130 mm is prepared, and a test piece for measurement is cut out therefrom, according to JIS K 6812 “Method for evaluating pigment dispersion or carbon dispersion of polyolefin pipe, joint and compound”
- the aggregates of silica in each test piece were counted to calculate the dispersion ratio (%), and the dispersion ratio of Comparative Example 7 was set to 100, and the silica dispersion ratio was displayed as an index.
- Silica dispersion index (dispersion ratio of each composition / dispersion ratio of comparative example 7) ⁇ 100
- a test piece of a predetermined size is cut out from the obtained vulcanized rubber sheet, and an initial strain of 10%, a dynamic strain of 2%, and a frequency of 10 Hz using a visco-elastic spectrometer manufactured by Ueshima Seisakusho Co., Ltd.
- the loss tangent (tan ⁇ ) of the vulcanized rubber sheet at 60 ° C. was measured.
- the tan ⁇ of Comparative Example 7 was set to 100, and the index was displayed by the following formula (Fuel Efficiency Index). The larger the index, the better the fuel economy.
- (Fuel efficiency index) (tan ⁇ of Comparative Example 7) / (tan ⁇ of each composition) ⁇ 100
- the grip performance was evaluated based on the braking performance obtained by the antilock brake system (ABS) evaluation test. That is, the test tire is mounted on a passenger car equipped with an ABS of 1800 cc class, and an asphalt road surface (wet road surface condition, skid number about 50) is allowed to travel on the vehicle, and brake is applied at 100 km / h.
- ABS antilock brake system
- the degree of deceleration is the distance until the passenger car stops.
- the wet grip performance index of comparative example 7 is set to 100, and the deceleration of each composition was shown as a wet grip performance index by the following formula. The larger the wet grip performance index, the better the braking performance, and the better the wet grip performance.
- (Wet grip performance index) (deceleration of comparative example 7) / (deceleration of each composition) ⁇ 100
- Wear resistance test Wear test
- the manufactured test tire was attached to a car, and the amount of decrease in groove depth after traveling 8000 km in the city area was measured, and the travel distance when the groove depth decreased by 1 mm was calculated.
- the abrasion resistance index of the comparative example 7 was set to 100, and the reduction amount of the groove depth of each formulation was index-displayed by the following formula. The larger the wear resistance index, the better the wear resistance.
- (Abrasion resistance index) (traveling distance when the groove depth is reduced by 1 mm in each composition) / (traveling distance when the groove of the tire of Comparative Example 7 is reduced by 1 mm) ⁇ 100
- Examples 6 to 9 and Comparative Examples 11 to 10 Using a Banbury mixer, materials other than the compounding amounts of sulfur and vulcanization accelerator shown in Table 7 were added, and kneaded for 5 minutes so that the discharge temperature was about 150 ° C. (base kneading step). Furthermore, sulfur and a vulcanization accelerator of compounding quantities shown in Table 3 are added to the obtained kneaded material, and it knead
- the above-mentioned unvulcanized rubber composition was formed into a clinch shape, bonded to another tire member, and vulcanized at 170 ° C. for 15 minutes to prepare a test tire.
- Mooney viscosity index Each unvulcanized rubber composition was measured at 100 ° C. according to the measurement method of Mooney viscosity in accordance with JIS K 6300. The larger the index, the better the processability.
- a test piece of a predetermined size is cut out from the obtained vulcanized rubber sheet, and an initial strain of 10%, a dynamic strain of 2%, and a frequency of 10 Hz using a visco-elastic spectrometer manufactured by Ueshima Seisakusho Co., Ltd.
- the loss tangent (tan ⁇ ) of the vulcanized rubber sheet at 60 ° C. was measured.
- the tan ⁇ of Comparative Example 11 was set to 100, and the index was displayed using the following formula (Fuel Efficiency Index). The larger the index, the better the fuel economy.
- (Fuel efficiency index) (tan ⁇ of Comparative Example 11) / (tan ⁇ of each composition) ⁇ 100
- Wear resistance test Wear test
- the manufactured test tire was attached to a car, and the amount of decrease in groove depth after traveling 8000 km in the city area was measured, and the travel distance when the groove depth decreased by 1 mm was calculated.
- the abrasion resistance index of Comparative Example 11 was set to 100, and the reduction amount of the groove depth of each composition was index-displayed by the following formula. The larger the wear resistance index, the better the wear resistance.
- (Abrasion resistance index) (travel distance when the groove depth is reduced by 1 mm in each composition) / (travel distance when the groove of the tire of Comparative Example 11 is reduced by 1 mm) ⁇ 100
- the test tire was mounted on all wheels of a vehicle (domestic FF 2000 cc), and the vehicle was driven on a test course, and steering stability was evaluated by sensory evaluation of the driver. At that time, relative evaluation was performed with 10 points as full marks and the steering stability of Comparative Example 11 as 6 points. The larger the value is, the better the steering stability is.
- the pneumatic tire having a clinch member produced using a rubber composition containing a predetermined polybutadiene according to the present invention and having excellent processability, fracture characteristics and abrasion resistance has low fuel consumption and abrasion resistance. It is understood that the strength, the destructive property and the steering stability are excellent.
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Abstract
Description
[1]
(A)ムーニー粘度(ML1+4,100℃)が43~70、
(B)5質量%トルエン溶液粘度(Tcp)とムーニー粘度(ML1+4,100℃)との比(Tcp/ML1+4,100℃)が0.9~1.7、
(C)ML1+4,100℃測定終了時のトルクを100%としたとき、その値が80%減衰するまでの応力緩和時間(T80)が10.0~40.0秒、
(D)分子量分布(Mw/Mn)が2.50~4.00、および
(F)ミクロ構造分析におけるシス構造の割合が98モル%以下
の条件を満たすポリブタジエン(イ)と、
その他のゴム(ロ)と、
ゴム補強材(ハ)と
を含有するゴム組成物を用いて作製したタイヤ部材を有する空気入りタイヤ、
[2]
前記ポリブタジエン(イ)が、さらに、
(E)重量平均分子量(Mw)が40.0×104~75.0×104
の条件を満たす[1]に記載の空気入りタイヤ、
[3]
前記ポリブタジエン(イ)が、コバルト触媒を用いて製造されたものである[1]または[2]に記載の空気入りタイヤ、
[4]
前記その他のゴム(ロ)が、天然ゴムまたはイソプレンゴムを含む[1]~[3]のいずれかに記載の空気入りタイヤ、
[5]
前記その他のゴム(ロ)が、スチレンブタジエンゴムを含む[1]~[4]のいずれかに記載の空気入りタイヤ、
[6]
前記スチレンブタジエンゴムのスチレン含有量が30質量%以上である[5]に記載の空気入りタイヤ、
[7]
前記タイヤ部材がベーストレッド部材である請求項[1]~[6]のいずれかに記載の空気入りタイヤ、
[8]
前記ポリブタジエン(イ)5~90質量部と、前記その他のゴム(ロ)95~10質量部とからなるゴム成分(イ)+(ロ)100質量部に対する、前記ゴム補強材(ハ)の含有量が1~100質量部である[7]に記載の空気入りタイヤ、
[9]
前記タイヤ部材がサイドウォール部材である[1]~[6]のいずれかに記載の空気入りタイヤ、
[10]
前記タイヤ部材がトレッド部材である[1]~[6]のいずれかに記載の空気入りタイヤ、
[11]
前記ポリブタジエン(イ)5~90質量部と、前記その他のゴム(ロ)95~10質量部とからなるゴム成分(イ)+(ロ)100質量部に対する、前記ゴム補強材(ハ)の含有量が1~130質量部である[9]または[10]に記載の空気入りタイヤ、
[12]
前記タイヤ部材がクリンチであり、前記ゴム補強材(ハ)が、CTAB比表面積180m2/g以上、BET比表面積185m2/g以上のシリカを含む[1]~[6]のいずれかに記載の空気入りタイヤ、
[13]
前記ポリブタジエン(イ)5~90質量部と、前記その他のゴム(ロ)95~10質量部とからなるゴム成分(イ)+(ロ)100質量部に対する、前記シリカの含有量が1~150質量部である[12]に記載の空気入りタイヤ、
に関する。
本発明で使用するポリブタジエンは、以下の特性を有する。
本発明で使用するポリブタジエンは、遷移金属触媒、有機アルミニウム化合物、および水からなる触媒系により製造できる。
本発明のタイヤ用ゴム組成物は、上記のポリブタジエン(イ)と、その他のゴム(ロ)と、ゴム補強材(ハ)とを含む。
1gのシリカをピルボックス(高さ6cmおよび直径4cm)中で秤量し、脱イオン水を添加して質量を50gにし、2%のシリカを含有する水性懸濁液(これは2分間の磁気撹拌によって均質化される)を調製する。次いで、超音波砕解を420秒間実施し、さらに、均質化された懸濁液の全てが粒度分析器の容器に導入された後に、粒度測定を行う。
本発明のゴム組成物は、加工性およびタイヤ特性に優れたゴム組成物であることから、タイヤの各部材(トレッド(1層構造)、2層構造のトレッドの表面層(キャップトレッド)、内面層(ベーストレッド)、サイドウォール、カーカス、ベルト、ビード等)に使用できる。
窒素ガスで置換した内容1.5Lの撹拌機つきステンレス製反応槽中に、重合溶液1.0L(ブタジエン(BD):35.0質量%、シクロヘキサン(CH):28.0質量%、残りは2-ブテン類)を投入した。さらに、水(H2O)1.05mmol、ジエチルアルミニウムクロライド(DEAC)1.90mmol(アルミニウム/水=1.81(混合モル比))、コバルトオクトエート(Cocat)20.95μmol、およびシクロオクタジエン(COD)8.06mmolを加え、72℃で20分間撹拌することで、1,4シス重合を行った。その後、4,6-ビス(オクチルチオメチル)-o-クレゾールを含むエタノールを加えて重合を停止し、未反応のブタジエンおよび2-ブテン類を蒸発除去することで、ポリブタジエンを得た。
原料配合比および重合温度を表1のように変更したこと以外は、製造例1と同様に配合物およびゴム組成物を調製した。なお、製造例2~7および10では、有機アルミニウム化合物として、ジエチルアルミニウムクロライド(DEAC)とトリエチルアルミニウム(TEA)を併用した。
市販のポリブタジエン(宇部興産(株)製、商品名:BR150L)を用いたこと以外は、実施例1と同様に実施した。
試作ポリブタジエン((A)ムーニー粘度(ML1+4,100℃):67、(B)5質量%トルエン溶液粘度とムーニー粘度との比(Tpc/ML1+4,100℃):2.9、(C)応力緩和時間(T80):4.7秒、(F)ミクロ構造分析におけるシス構造:98.1モル%)を用いたこと以外は、実施例1と同様に実施した。
市販のポリブタジエン(宇部興産(株)製、商品名:BR710)を用いたこと以外は、実施例1と同様に実施した。
ポリブタジエンの5質量%トルエン溶液粘度(Tcp)は、ポリマー2.28gをトルエン50mlに溶解させた後、キャノンフェンスケ粘度計No.400を用いて25℃で測定した。なお、標準液としては、粘度計校正用標準液(JIS Z 8809)を用いた。
ポリブタジエンおよび配合物のムーニー粘度(ML1+4,100℃)は、JIS K 6300に準拠して100℃にて測定した。なお、配合物のML1+4,100℃については、比較例1を100とした指数を算出した(指数が大きいほど配合物のML1+4,100℃が小さく、加工性が良好となる)。
ポリブタジエンおよび配合物の応力緩和時間(T80)は、ASTM D1646-7に準じた応力緩和測定により算出した。具体的には、ML1+4,100℃の測定条件下、測定4分後にローターが停止した時(0秒)のトルクを100%とし、その値が80%緩和するまで(すなわち20%に減衰するまで)の時間(単位:秒)を応力緩和時間T80として測定した。
ポリブタジエンの数平均分子量(Mn)、重量平均分子量(Mw)、および分子量分布(Mw/Mn)は、GPC法(東ソー(株)製、商品名:HLC-8220)により、標準ポリスチレン換算で算出した。溶媒はテトラヒドロフランを用い、カラムはShodex製KF-805L(商品名)を2本直列に接続し、検出器は示唆屈折計(RI)を用いた。
ポリブタジエンのミクロ構造は、赤外吸収スペクトル分析によって算出した。具体的には、ミクロ構造に由来するピーク位置(cis:740cm-1、vinyl:910cm-1、trans:967cm-1)の吸収強度比から、ポリマーのミクロ構造を算出した。
ゴム組成物の耐摩耗性の指標として、JIS K 6264に準拠したランボーン摩耗係数を、スリップ率20%で測定し、比較例1を100とした指数を算出した(指数が大きいほどランボーン摩耗係数が大きく、耐摩耗性が良好となる)。
NR:RSS#3(Tg:-60℃)
BR1:製造例2のポリブタジエン
BR2:宇部興産(株)製のBR150L
BR3:宇部興産(株)製のBR710
SBR1:日本ゼオン(株)製のNipol NS116(N-メチルピロリドンで末端が変性された溶液重合SBR、スチレン含量:21質量%、Tg:-25℃)
SBR2:日本ゼオン(株)製のNipol 1502(スチレン含量:23.5質量%、ムーニー粘度:52)
SBR3:日本ゼオン(株)製のNipol 1739(スチレン含量:40.0質量%、ムーニー粘度:49)
シリカ1:エボニックデグッサ社製のウルトラジルVN3(N2SA:175m2/g)
シリカ2:Rhodia社製のZeosil 1115MP(CTAB比表面積:105m2/g、BET比表面積:115m2/g、平均一次粒子径:25nm、アグリゲートサイズ:92nm、細孔分布幅W:0.63、細孔分布曲線中の細孔容量ピーク値を与える直径Xs:60.3nm)
シリカ3:Rhodia社製のZeosil Premium 200MP(CTAB比表面積200m2/g、BET比表面積:220m2/g、平均一次粒子径:10nm、アグリゲートサイズ:65nm、D50:4.2μm、18μmを超える粒子の割合:1.0質量%、細孔分布幅W:1.57、細孔分布曲線中の細孔容量ピーク値を与える直径Xs:21.9nm)
シリカ4:Rhodia社製のZeosil HRS 1200MP(CTAB比表面積:195m2/g、BET比表面積:200m2/g、平均一次粒子径:15nm、アグリゲートサイズ:40nm、D50:6.5μm、18μmを超える粒子の割合:5.0質量%、細孔分布幅W:0.40、細孔分布曲線中の細孔容量ピーク値を与える直径Xs:18.8nm)
カーボンブラック:三菱化学(株)製のダイアブラックE(N550)(N2SA:41m2/g)
オイル:出光興産(株)製のダイアナプロセスAH-24(アロマ系プロセスオイル)
シランカップリング剤:エボニックデグッサ社製のSi69(ビス(3-トリエトキシシリルプロピル)テトラスルフィド)
ワックス:大内新興化学工業(株)製のサンノックN
老化防止剤:精工化学(株)製のオゾノン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)
酸化亜鉛:三井金属鉱業(株)製の酸化亜鉛
ステアリン酸:日油(株)製のステアリン酸「椿」
硫黄:鶴見化学工業(株)製の粉末硫黄
加硫促進剤1:大内新興化学工業(株)製のノクセラーNS(N-t-ブチル-2-ベンゾチアゾールスルフェンアミド)
加硫促進剤2: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-ベンゾチアジルスルフェンアミド)
加硫促進剤3:大内新興化学工業(株)製のノクセラーD(N,N’-ジフェニルグアニジン)
バンバリーミキサーを用いて、表3に示す配合量の硫黄および加硫促進剤以外の材料を投入して、排出温度が約150℃となるように5分間混練りした(ベース練り工程)。さらに、得られた混練り物に表3に示す配合量の硫黄および加硫促進剤を加え、オープンロールを用いて、排出温度が80℃となるように約3分間混練りして、未加硫ゴム組成物を得た(仕上げ練り工程)。得られた未加硫ゴム組成物を170℃で20分間プレス加硫し、加硫ゴムシートおよび加硫ゴム試験片を得た。
各未加硫ゴム組成物について、JIS K 6300に準拠したムーニー粘度の測定方法に従い、100℃で測定した。指数が大きいほど、加工性に優れる。
各未加硫ゴム組成物について、ロール通過後のゴムシート表面平滑性およびシート端平滑性を目視評価した。5段階の官能評価で、5が良好、1が悪い。数値が大きいほど、加工性(目視)に優れる。
2mm×130mm×130mmの加硫ゴムシートを作製し、そこから測定用試験片を切り出し、JIS K 6812「ポリオレフィン管、継手及びコンパウンドの顔料分散又はカーボン分散の評価方法」に準じて、各試験片中のシリカの凝集塊をカウントして、分散率(%)をそれぞれ算出して、比較例1の分散率を100として、シリカ分散率を指数表示した。シリカ分散指数が大きいほどシリカが分散し、シリカの分散性に優れることを示す。
(シリカ・カーボン分散指数)=(各配合の分散率/比較例1の分散率)×100
得られた加硫ゴムシートから所定サイズの試験片を切り出し、(株)上島製作所製の粘弾性スペクトロメーターを用いて、初期歪10%、動歪み2%、周波数10Hzの条件下で、60℃における加硫ゴムシートの損失正接(tanδ)を測定した。比較例1のtanδを100とし、以下の計算式により指数表示した(低燃費性指数)。指数が大きいほど、低燃費性に優れることを示す。
(低燃費性指数)=(比較例1のtanδ)/(各配合のtanδ)×100
JIS K 6251「加硫ゴムおよび熱可塑性ゴム-引張特性の求め方」に従って、各加硫ゴムシートの引張強度と破断伸びを測定した。さらに、引張強度×破断伸び/2により破壊エネルギーを計算し、下記式にて、破壊エネルギー指数を計算した。破壊エネルギー指数が大きいほど、力学強度に優れることを示す。
(破壊エネルギー指数)=(各配合の破壊エネルギー)/(比較例1の破壊エネルギー)×100
試験用タイヤを車輌(国産FF2000cc)の全輪に装着してテストコースを実車走行し、ドライバーの官能評価により操縦安定性を評価した。その際に、10点を満点とし、比較例1の操縦安定性を6点としてそれぞれ相対評価を行った。数値が大きいほど、操縦安定性に優れることを示す。
バンバリーミキサーを用いて、表4に示す配合量の硫黄および加硫促進剤以外の材料を投入して、排出温度が約150℃となるように5分間混練りした(ベース練り工程)。さらに、得られた混練り物に表3に示す配合量の硫黄および加硫促進剤を加え、オープンロールを用いて、排出温度が80℃となるように約3分間混練りして、未加硫ゴム組成物を得た(仕上げ練り工程)。得られた未加硫ゴム組成物を170℃で20分間プレス加硫し、加硫ゴムシートおよび加硫ゴム試験片を得た。
各未加硫ゴム組成物について、JIS K 6300に準拠したムーニー粘度の測定方法に従い、100℃で測定した。指数が大きいほど、加工性に優れる。
各未加硫ゴム組成物について、ロール通過後のゴムシート表面平滑性およびシート端平滑性を目視評価した。5段階の官能評価で、5が良好、1が悪い。数値が大きいほど、加工性(目視)に優れる
得られた加硫ゴムシートから所定サイズの試験片を切り出し、(株)上島製作所製の粘弾性スペクトロメーターを用いて、初期歪10%、動歪み2%、周波数10Hzの条件下で、60℃における加硫ゴムシートの損失正接(tanδ)を測定した。比較例3のtanδを100とし、以下の計算式により指数表示した(低燃費性指数)。指数が大きいほど、低燃費性に優れることを示す。
(低燃費性指数)=(比較例3のtanδ)/(各配合のtanδ)×100
JIS K 6252「加硫ゴムおよび熱可塑性ゴム-引裂強さの求め方」に準じて、切り込みなしのアングル形の試験片(加硫ゴムシート)を用いることにより、引裂強さ(N/mm)を求め、比較例3の引裂強さを100として、以下の式により、引裂強さ指数を算出した。引裂強さ指数が大きいほど、引裂強さが大きく、耐久性に優れていることを示す。
(引裂強さ指数)=(各配合の引裂強さ)/(比較例3の引裂強さ)×100
JIS K 6260「加硫ゴムおよび熱可塑性ゴムのデマチャ屈曲亀裂試験方法」に準じて、温度23℃、相対湿度55%の条件下で、各加硫ゴムシートに関して、100万回試験後の亀裂長さ、または成長が1mmになるまでの回数を測定した。得られた回数および亀裂長さをもとに、サンプルに1mmの亀裂が成長するまでの屈曲回数を常用対数値で表し、さらにそれを比較例1の常用対数値を100とする指数で以下のように表した。なお、70%および110%とは、もとの加硫ゴム試験片サンプルの長さに対する伸び率を表し、該常用対数値の指数が大きいほど亀裂が成長しにくく、耐屈曲亀裂成長性が優れ、耐久性に優れていることを示す。
(屈曲亀裂成長性指数(70%、110%))=(各配合で1mmの亀裂が成長するまでの屈曲回数の常用対数値/比較例3で1mmの亀裂が成長するまでの屈曲回数の常用対数値)×100
JIS K 6251「加硫ゴムおよび熱可塑性ゴム-引張特性の求め方」に従って、各加硫ゴムシートの引張強度と破断伸びを測定した。さらに、引張強度×破断伸び/2により破壊エネルギーを計算し、下記式にて、破壊エネルギー指数を計算した。破壊エネルギー指数が大きいほど、力学強度に優れ、破壊特性に優れていることを示す。
(破壊エネルギー指数)=(各配合の破壊エネルギー)/(比較例3の破壊エネルギー)×100
試験用タイヤを車輌(国産FF2000cc)の全輪に装着してテストコースを実車走行し、ドライバーの官能評価により操縦安定性を評価した。その際に、10点を満点とし、比較例3の操縦安定性を6点としてそれぞれ相対評価を行った。数値が大きいほど、操縦安定性に優れることを示す。
バンバリーミキサーを用いて、表5に示す配合量の硫黄および加硫促進剤以外の材料を投入して、排出温度が約150℃となるように5分間混練りした(ベース練り工程)。さらに、得られた混練り物に表3に示す配合量の硫黄および加硫促進剤を加え、オープンロールを用いて、排出温度が80℃となるように約3分間混練りして、未加硫ゴム組成物を得た(仕上げ練り工程)。得られた未加硫ゴム組成物を170℃で20分間プレス加硫し、加硫ゴムシートおよび加硫ゴム試験片を得た。
各未加硫ゴム組成物について、JIS K 6300に準拠したムーニー粘度の測定方法に従い、100℃で測定した。指数が大きいほど、加工性に優れる。
各未加硫ゴム組成物について、ロール通過後のゴムシート表面平滑性およびシート端平滑性を目視評価した。5段階の官能評価で、5が良好、1が悪い。数値が大きいほど、加工性(目視)に優れる
2mm×130mm×130mmの加硫ゴムシートを作製し、そこから測定用試験片を切り出し、JIS K 6812「ポリオレフィン管、継手及びコンパウンドの顔料分散又はカーボン分散の評価方法」に準じて、各試験片中のシリカの凝集塊をカウントして、分散率(%)をそれぞれ算出し、比較例5の分散率を100として、シリカ分散率を指数表示した。シリカ分散指数が大きいほどシリカが分散し、シリカの分散性に優れることを示す。
(シリカ分散指数)=(各配合の分散率/比較例5の分散率)×100
得られた加硫ゴムシートから所定サイズの試験片を切り出し、(株)上島製作所製の粘弾性スペクトロメーターを用いて、初期歪10%、動歪み2%、周波数10Hzの条件下で、60℃における加硫ゴムシートの損失正接(tanδ)を測定した。比較例5のtanδを100とし、以下の計算式により指数表示した(低燃費性指数)。指数が大きいほど、低燃費性に優れることを示す。
(低燃費性指数)=(比較例5のtanδ)/(各配合のtanδ)×100
アンチロックブレーキシステム(ABS)評価試験により得られた制動性能をもとにして、グリップ性能を評価した。すなわち、1800cc級のABSが装備された乗用車に、前記試験用タイヤを装着して、アスファルト路面(ウェット路面状態、スキッドナンバー約50)を実車走行させ、時速100km/hの時点でブレーキをかけ、乗用車が停止するまでの減速度を算出した。ここで、減速度とは、乗用車が停止するまでの距離である。そして、比較例5のウェットグリップ性能指数を100とし、下記計算式により、各配合の減速度をウェットグリップ性能指数として示した。なお、ウェットグリップ性能指数が大きいほど制動性能が良好であり、ウェットグリップ性能に優れることを示す。
(ウェットグリップ性能指数)=(比較例5の減速度)/(各配合の減速度)×100
製造した試験用タイヤを車に装着し、市街地を8000km走行後の溝深さの減少量を測定し、溝深さが1mm減少するときの走行距離を算出した。さらに、比較例5の耐摩耗性指数を100とし、下記計算式により、各配合の溝深さの減少量を指数表示した。なお、耐摩耗性指数が大きいほど、耐摩耗性に優れることを示す。
(耐摩耗性指数)=(各配合で1mm溝深さが減るときの走行距離)/(比較例5のタイヤの溝が1mm減るときの走行距離)×100
バンバリーミキサーを用いて、表6に示す配合量の硫黄および加硫促進剤以外の材料を投入して、排出温度が約150℃となるように5分間混練りした(ベース練り工程)。さらに、得られた混練り物に表3に示す配合量の硫黄および加硫促進剤を加え、オープンロールを用いて、排出温度が80℃となるように約3分間混練りして、未加硫ゴム組成物を得た(仕上げ練り工程)。得られた未加硫ゴム組成物を170℃で20分間プレス加硫し、加硫ゴムシートおよび加硫ゴム試験片を得た。
各未加硫ゴム組成物について、JIS K 6300に準拠したムーニー粘度の測定方法に従い、100℃で測定した。指数が大きいほど、加工性に優れる。
各未加硫ゴム組成物について、ロール通過後のゴムシート表面平滑性およびシート端平滑性を目視評価した。5段階の官能評価で、5が良好、1が悪い。数値が大きいほど、加工性(目視)に優れる
2mm×130mm×130mmの加硫ゴムシートを作製し、そこから測定用試験片を切り出し、JIS K 6812「ポリオレフィン管、継手及びコンパウンドの顔料分散又はカーボン分散の評価方法」に準じて、各試験片中のシリカの凝集塊をカウントして、分散率(%)をそれぞれ算出し、比較例7の分散率を100として、シリカ分散率を指数表示した。シリカ分散指数が大きいほどシリカが分散し、シリカの分散性に優れることを示す。
(シリカ分散指数)=(各配合の分散率/比較例7の分散率)×100
得られた加硫ゴムシートから所定サイズの試験片を切り出し、(株)上島製作所製の粘弾性スペクトロメーターを用いて、初期歪10%、動歪み2%、周波数10Hzの条件下で、60℃における加硫ゴムシートの損失正接(tanδ)を測定した。比較例7のtanδを100とし、以下の計算式により指数表示した(低燃費性指数)。指数が大きいほど、低燃費性に優れることを示す。
(低燃費性指数)=(比較例7のtanδ)/(各配合のtanδ)×100
アンチロックブレーキシステム(ABS)評価試験により得られた制動性能をもとにして、グリップ性能を評価した。すなわち、1800cc級のABSが装備された乗用車に、前記試験用タイヤを装着して、アスファルト路面(ウェット路面状態、スキッドナンバー約50)を実車走行させ、時速100km/hの時点でブレーキをかけ、乗用車が停止するまでの減速度を算出した。ここで、減速度とは、乗用車が停止するまでの距離である。そして、比較例7のウェットグリップ性能指数を100とし、下記計算式により、各配合の減速度をウェットグリップ性能指数として示した。なお、ウェットグリップ性能指数が大きいほど制動性能が良好であり、ウェットグリップ性能に優れることを示す。
(ウェットグリップ性能指数)=(比較例7の減速度)/(各配合の減速度)×100
製造した試験用タイヤを車に装着し、市街地を8000km走行後の溝深さの減少量を測定し、溝深さが1mm減少するときの走行距離を算出した。さらに、比較例7の耐摩耗性指数を100とし、下記計算式により、各配合の溝深さの減少量を指数表示した。なお、耐摩耗性指数が大きいほど、耐摩耗性に優れることを示す。
(耐摩耗性指数)=(各配合で1mm溝深さが減るときの走行距離)/(比較例7のタイヤの溝が1mm減るときの走行距離)×100
バンバリーミキサーを用いて、表7に示す配合量の硫黄および加硫促進剤以外の材料を投入して、排出温度が約150℃となるように5分間混練りした(ベース練り工程)。さらに、得られた混練り物に表3に示す配合量の硫黄および加硫促進剤を加え、オープンロールを用いて、排出温度が80℃となるように約3分間混練りして、未加硫ゴム組成物を得た(仕上げ練り工程)。得られた未加硫ゴム組成物を170℃で20分間プレス加硫し、加硫ゴムシートおよび加硫ゴム試験片を得た。
各未加硫ゴム組成物について、JIS K 6300に準拠したムーニー粘度の測定方法に従い、100℃で測定した。指数が大きいほど、加工性に優れる。
各未加硫ゴム組成物について、ロール通過後のゴムシート表面平滑性およびシート端平滑性を目視評価した。5段階の官能評価で、5が良好、1が悪い。数値が大きいほど、加工性(目視)に優れる
JIS K 6251「加硫ゴムおよび熱可塑性ゴム-引張特性の求め方」に従って、各加硫ゴムシートの引張強度と破断伸びを測定した。さらに、引張強度×破断伸び/2により破壊エネルギーを計算し、下記式にて、破壊エネルギー指数を計算した。破壊エネルギー指数が大きいほど、力学強度に優れ、破壊特性に優れていることを示す。
(破壊エネルギー指数)=(各配合の破壊エネルギー)/(比較例11の破壊エネルギー)×100
得られた加硫ゴムシートから所定サイズの試験片を切り出し、(株)上島製作所製の粘弾性スペクトロメーターを用いて、初期歪10%、動歪み2%、周波数10Hzの条件下で、60℃における加硫ゴムシートの損失正接(tanδ)を測定した。比較例11のtanδを100とし、以下の計算式により指数表示した(低燃費性指数)。指数が大きいほど、低燃費性に優れることを示す。
(低燃費性指数)=(比較例11のtanδ)/(各配合のtanδ)×100
製造した試験用タイヤを車に装着し、市街地を8000km走行後の溝深さの減少量を測定し、溝深さが1mm減少するときの走行距離を算出した。さらに、比較例11の耐摩耗性指数を100とし、下記計算式により、各配合の溝深さの減少量を指数表示した。なお、耐摩耗性指数が大きいほど、耐摩耗性に優れることを示す。
(耐摩耗性指数)=(各配合で1mm溝深さが減るときの走行距離)/(比較例11のタイヤの溝が1mm減るときの走行距離)×100
試験用タイヤを車輌(国産FF2000cc)の全輪に装着してテストコースを実車走行し、ドライバーの官能評価により操縦安定性を評価した。その際に、10点を満点とし、比較例11の操縦安定性を6点としてそれぞれ相対評価を行った。数値が大きいほど、操縦安定性に優れることを示す。
Claims (13)
- (A)ムーニー粘度(ML1+4,100℃)が43~70、
(B)5質量%トルエン溶液粘度(Tcp)とムーニー粘度(ML1+4,100℃)との比(Tcp/ML1+4,100℃)が0.9~1.7、
(C)ML1+4,100℃測定終了時のトルクを100%としたとき、その値が80%減衰するまでの応力緩和時間(T80)が10.0~40.0秒、
(D)分子量分布(Mw/Mn)が2.50~4.00、および
(F)ミクロ構造分析におけるシス構造の割合が98モル%以下
の条件を満たすポリブタジエン(イ)と、
その他のゴム(ロ)と、
ゴム補強材(ハ)と
を含有するゴム組成物を用いて作製したタイヤ部材を有する空気入りタイヤ。 - 前記ポリブタジエン(イ)が、さらに、
(E)重量平均分子量(Mw)が40.0×104~75.0×104
の条件を満たす請求項1に記載の空気入りタイヤ。 - 前記ポリブタジエン(イ)が、コバルト触媒を用いて製造されたものである請求項1または2に記載の空気入りタイヤ。
- 前記その他のゴム(ロ)が、天然ゴムまたはイソプレンゴムを含む請求項1~3のいずれか1項に記載の空気入りタイヤ。
- 前記その他のゴム(ロ)が、スチレンブタジエンゴムを含む請求項1~4のいずれか1項に記載の空気入りタイヤ。
- 前記スチレンブタジエンゴムのスチレン含有量が30質量%以上である請求項5記載の空気入りタイヤ。
- 前記タイヤ部材がベーストレッド部材である請求項1~6のいずれか1項に記載の空気入りタイヤ。
- 前記ポリブタジエン(イ)5~90質量部と、前記その他のゴム(ロ)95~10質量部とからなるゴム成分(イ)+(ロ)100質量部に対する、前記ゴム補強材(ハ)の含有量が1~100質量部である請求項7に記載の空気入りタイヤ。
- 前記タイヤ部材がサイドウォール部材である請求項1~6のいずれか1項に記載の空気入りタイヤ。
- 前記タイヤ部材がトレッド部材である請求項1~6のいずれか1項に記載の空気入りタイヤ。
- 前記ポリブタジエン(イ)5~90質量部と、前記その他のゴム(ロ)95~10質量部とからなるゴム成分(イ)+(ロ)100質量部に対する、前記ゴム補強材(ハ)の含有量が1~130質量部である請求項9または10に記載の空気入りタイヤ。
- 前記タイヤ部材がクリンチであり、
前記ゴム補強材(ハ)が、CTAB比表面積180m2/g以上、BET比表面積185m2/g以上のシリカを含む請求項1~6のいずれか1項に記載の空気入りタイヤ。 - 前記ポリブタジエン(イ)5~90質量部と、前記その他のゴム(ロ)95~10質量部とからなるゴム成分(イ)+(ロ)100質量部に対する、前記シリカの含有量が1~150質量部である請求項12に記載の空気入りタイヤ。
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US9676881B2 (en) | 2014-03-31 | 2017-06-13 | Ube Industries, Ltd. | Polybutadiene |
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2016
- 2016-08-17 EP EP16850943.8A patent/EP3336139B1/en active Active
- 2016-08-17 CN CN201680053385.5A patent/CN108026331B/zh active Active
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Cited By (4)
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EP3372637A1 (en) * | 2017-03-08 | 2018-09-12 | Sumitomo Rubber Industries, Ltd. | Rubber composition for tires and pneumatic tire |
JP2019218502A (ja) * | 2018-06-21 | 2019-12-26 | 住友ゴム工業株式会社 | キャップトレッドおよび空気入りタイヤ |
JP2019218504A (ja) * | 2018-06-21 | 2019-12-26 | 住友ゴム工業株式会社 | ベーストレッドおよび空気入りタイヤ |
JP2019218503A (ja) * | 2018-06-21 | 2019-12-26 | 住友ゴム工業株式会社 | サイドウォールおよび空気入りタイヤ |
Also Published As
Publication number | Publication date |
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JPWO2017056767A1 (ja) | 2018-07-19 |
JP2021073345A (ja) | 2021-05-13 |
JP7283860B2 (ja) | 2023-05-30 |
EP3336139A4 (en) | 2019-05-08 |
US20180258262A1 (en) | 2018-09-13 |
JP7140212B2 (ja) | 2022-09-21 |
CN108026331B (zh) | 2021-06-25 |
EP3336139A1 (en) | 2018-06-20 |
EP3336139B1 (en) | 2022-03-23 |
US10435546B2 (en) | 2019-10-08 |
CN108026331A (zh) | 2018-05-11 |
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