Classifications

• • 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
  • C08C19/22—Incorporating nitrogen atoms into the molecule
• • 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
  • C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
  • C08K13/06—Pretreated ingredients and ingredients covered by the main groups C08K3/00 - C08K7/00
• • 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
• • 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
  • C08C19/25—Incorporating silicon atoms into the molecule
• • 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
  • C08C19/30—Addition of a reagent which reacts with a hetero atom or a group containing hetero atoms of the macromolecule
  • C08C19/42—Addition of a reagent which reacts with a hetero atom or a group containing hetero atoms of the macromolecule reacting with metals or metal-containing groups
  • C08C19/44—Addition of a reagent which reacts with a hetero atom or a group containing hetero atoms of the macromolecule reacting with metals or metal-containing groups of polymers containing metal atoms exclusively at one or both ends of the skeleton
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K3/00—Use of inorganic substances as compounding ingredients
  • C08K3/34—Silicon-containing compounds
  • C08K3/36—Silica
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/54—Silicon-containing compounds
  • C08K5/548—Silicon-containing compounds containing sulfur
• • 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
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K3/00—Use of inorganic substances as compounding ingredients
  • C08K3/02—Elements
  • C08K3/04—Carbon
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/04—Oxygen-containing compounds
  • C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
  • C08K5/098—Metal salts of carboxylic acids
• • 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
  • C08K9/00—Use of pretreated ingredients
  • C08K9/04—Ingredients treated with organic substances
  • C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
• • 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
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2205/00—Polymer mixtures characterised by other features
  • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
  • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
  • Y02T10/00—Road transport of goods or passengers
  • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
  • Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction 

Definitions

• the present invention relates to a rubber composition for tires, tread rubber and tires.
• the present invention solves the above-described problems of the prior art, and provides a tire rubber composition that can prevent discoloration of the tire appearance while improving the wet grip performance and low rolling resistance of the tire. And it is an object to provide a tread rubber made of such a rubber composition. Another object of the present invention is to provide a tire that is excellent in wet grip performance and low rolling resistance, and that is resistant to discoloration in appearance.
• a tread rubber comprising the tire rubber composition according to any one of [1] to [7].
• a tire rubber composition capable of preventing discoloration of the tire appearance while improving wet grip performance and low rolling resistance of the tire, and a tread rubber comprising such a rubber composition.
• a tire rubber composition capable of preventing discoloration of the tire appearance while improving wet grip performance and low rolling resistance of the tire, and a tread rubber comprising such a rubber composition.
• the rubber composition for tires, the tread rubber and the tire of the present invention will be exemplified in detail below based on the embodiments thereof.
• the rubber composition for tires of the present invention contains a rubber component, a filler, a silane coupling agent, and a fatty acid metal salt.
• the rubber component contains an isoprene skeleton rubber and a styrene-butadiene rubber
• the filler contains at least silica
• the silane coupling agent has a thiol group
• the content of the silane coupling agent is 1 part by mass or more and 10.5 parts by mass or less with respect to 100 parts by mass of the silica
• the content of the fatty acid metal salt is 0.1 part by mass with respect to 100 parts by mass of the rubber component. It is characterized by being more than 3.5 parts by mass and less than 3.5 parts by mass.
• the isoprene skeleton rubber and the styrene-butadiene rubber as rubber components contribute to improving the wet grip performance and low rolling resistance of the tire to which the rubber composition is applied.
• silica as a filler also contributes to improving the wet grip performance and low rolling resistance of the tire to which the rubber composition is applied.
• the fatty acid metal salt acts as a processing aid. The adhesiveness of the composition is suppressed, the rubber composition is less likely to adhere to manufacturing equipment, and the productivity of the rubber composition is improved.
• the rubber composition for tires of the present invention contains a rubber component, which contains an isoprene skeleton rubber and a styrene-butadiene rubber, and may further contain other rubber components.
• SBR styrene-butadiene rubber
• SBR styrene-butadiene rubber
• any styrene-butadiene rubber can be used, and it may be obtained by solution polymerization or by emulsion polymerization. , may be obtained by other polymerization methods.
• the styrene-butadiene rubber contains styrene units and butadiene units as monomer units, but the content of styrene units, that is, the amount of bound styrene is not particularly limited. From the viewpoint of further improving the wet grip performance of the tire to which the rubber composition is applied, the styrene-butadiene rubber preferably contains at least styrene-butadiene rubber having a bound styrene content of 35% by mass or more.
• the ratio of the styrene-butadiene rubber having a bound styrene content of 35% by mass or more in the total amount of the styrene-butadiene rubber is preferably 10% by mass or more, more preferably 20% by mass or more, and is 100% by mass. good too.
• the amount of bound styrene in the styrene-butadiene rubber can be adjusted by adjusting the amount of monomers used for polymerization of the styrene-butadiene rubber, the degree of polymerization, and the like.
• the amount of bound styrene can be measured by ultraviolet absorption of phenyl groups.
• the styrene-butadiene rubber may or may not be modified, but is preferably modified, that is, modified styrene-butadiene rubber.
• modified styrene-butadiene rubber When the modified styrene-butadiene rubber is used, the wet grip performance and low rolling resistance of the tire to which the rubber composition is applied can be further improved.
• the styrene-butadiene rubber is preferably modified with an aminoalkoxysilane compound. More preferably, it is modified with a compound.
• the terminal of the styrene-butadiene rubber is modified with an aminoalkoxysilane compound, the interaction between the modified styrene-butadiene rubber and the filler (especially silica) is particularly large.
• aminoalkoxysilane compound is not particularly limited, an aminoalkoxysilane compound represented by the following general formula (i) is preferable.
• R 11 and R 12 each independently represent a monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms or a monovalent aromatic hydrocarbon group having 6 to 18 carbon atoms, and R At least one of 11 and R 12 is substituted with an amino group, a is an integer of 0 to 2, and when there are multiple OR 12 , each OR 12 may be the same or different, and the molecule It does not contain active protons.
• aminoalkoxysilane compound an aminoalkoxysilane compound represented by the following general formula (ii) is also preferable.
• a 1 is a saturated cyclic tertiary amine compound residue, an unsaturated cyclic tertiary amine compound residue, a ketimine residue, a nitrile group, a (thio)isocyanate group, an isocyanurate trihydrocarbyl ester group, a nitrile group, a pyridine group, It is at least one functional group selected from a (thio)ketone group, an amide group, and a primary or secondary amino group having a hydrolyzable group.
• R 23 is a monovalent aliphatic or alicyclic hydrocarbon group having 1 to 20 carbon atoms, a monovalent aromatic hydrocarbon group having 6 to 18 carbon atoms or a halogen atom, and when n3 is 2 or more, may be the same or different.
• R 24 is a divalent aliphatic or alicyclic hydrocarbon group having 1 to 20 carbon atoms or a divalent aromatic hydrocarbon group having 6 to 18 carbon atoms; can be different.
• the hydrolyzable group in the primary or secondary amino group having a hydrolyzable group is preferably a trimethylsilyl group or a tert-butyldimethylsilyl group, particularly preferably a trimethylsilyl group.
• aminoalkoxysilane compound represented by the above general formula (ii) is preferably an aminoalkoxysilane compound represented by the following general formula (iii).
• R 28 is a divalent aliphatic or alicyclic hydrocarbon group having 1 to 20 carbon atoms or a divalent aromatic hydrocarbon group having 6 to 18 carbon atoms.
• the hydrolyzable group is preferably a trimethylsilyl group or a tert-butyldimethylsilyl group, particularly preferably a trimethylsilyl group.
• aminoalkoxysilane compound represented by general formula (ii) above is also preferably an aminoalkoxysilane compound represented by general formula (iv) or general formula (v) below.
• R 37 is a dimethylaminomethyl group, dimethylaminoethyl group, diethylaminomethyl group, diethylaminoethyl group, methylsilyl(methyl)aminomethyl group, methylsilyl(methyl)aminoethyl group, methylsilyl(ethyl)aminomethyl group, methylsilyl(ethyl) an aminoethyl group, a dimethylsilylaminomethyl group, a dimethylsilylaminoethyl group, a monovalent aliphatic or alicyclic hydrocarbon group having 1 to 20 carbon atoms, or a monovalent aromatic hydrocarbon group having 6 to 18 carbon atoms; Yes, and when r1 is 2 or more, they may be the same or different.
• the aminoalkoxysilane compound represented by the general formula (ii) is an aminoalkoxysilane represented by the following general formula (x), the following general formula (xi), the following general formula (xii), or the following general formula (xiii) Compounds are also preferred.
• A is preferably represented by any one of the following general formulas (II) to (V).
• A is represented by any one of the general formulas (II) to (V)
• a modified styrene-butadiene rubber having better performance can be obtained.
• B 1 represents a single bond or a hydrocarbon group having 1-20 carbon atoms, and a represents an integer of 1-10. B 1 when there is more than one is independent.
• B4 represents a single bond or a hydrocarbon group having 1-20 carbon atoms, and a represents an integer of 1-10. B 4 when there is more than one is independent.
• Examples of the coupling agent represented by the general formula (I) include bis(3-trimethoxysilylpropyl)-[3-(2,2-dimethoxy-1-aza-2-silacyclopentane)propyl] Amine, Tris(3-trimethoxysilylpropyl)amine, Tris(3-triethoxysilylpropyl)amine, Tris(3-trimethoxysilylpropyl)-[3-(2,2-dimethoxy-1-aza-2- silacyclopentane)propyl]-1,3-propanediamine, tetrakis[3-(2,2-dimethoxy-1-aza-2-silacyclopentane)propyl]-1,3-propanediamine, tetrakis(3-tri methoxysilylpropyl)-1,3-propanediamine, tetrakis(3-trimethoxysilylpropyl)-1,3-bisaminomethylcyclo
• the rubber composition for tires of the present invention contains a filler, and the filler contains at least silica, that is, may be silica only, or may further contain other fillers. Inclusion of a filler improves the reinforcing properties of the rubber composition.
• the content of the filler in the rubber composition is preferably 20 parts by mass or more and less than 120 parts by mass with respect to 100 parts by mass of the rubber component. When the content of the filler in the rubber composition is 20 parts by mass or more with respect to 100 parts by mass of the rubber component, the tire to which the rubber composition is applied is sufficiently reinforced, and is less than 120 parts by mass. As a result, the low rolling resistance of the tire to which the rubber composition is applied is improved.
• the content of silica is more preferably 30 parts by mass or more, and even more preferably 40 parts by mass or more, with respect to 100 parts by mass of the rubber component. 55 parts by mass or more is particularly preferable.
• the content of silica is more preferably 110 parts by mass or less, more preferably 100 parts by mass or less, relative to 100 parts by mass of the rubber component. More preferably, it is particularly preferably 90 parts by mass or less.
• the filler may contain inorganic fillers such as clay, talc, calcium carbonate, aluminum hydroxide, etc., in addition to silica and carbon black.
• inorganic fillers such as clay, talc, calcium carbonate, aluminum hydroxide, etc.
• the above-mentioned other fillers are preferably contained within a range in which the ratio of silica in the filler is 80% by mass or more.
• the content of the silane coupling agent is preferably 2 parts by mass or more, more preferably 3 parts by mass or more, relative to 100 parts by mass of silica. From the viewpoint of preventing discoloration of the appearance, the content of the silane coupling agent is preferably 10.3 parts by mass or less, more preferably 10.1 parts by mass or less, relative to 100 parts by mass of silica.
• the silane coupling agent preferably has 20 or more and 75 or less carbon atoms.
• the carbon number of the silane coupling agent is 20 or more and 75 or less, it becomes possible to further improve the wet grip performance and low rolling resistance of the tire to which the rubber composition is applied.
• the silane coupling agent preferably contains an alkyl group, and the number of carbon atoms in the alkyl group having the largest number of carbon atoms is preferably in the range of 7 to 20. Also in this case, it is possible to further improve the wet grip performance and low rolling resistance of the tire to which the rubber composition is applied.
• the silane coupling agent having a thiol group is preferably represented by the following general formula (1).
• R 4 has 1 to 12 carbon atoms and is a linear, branched, or cyclic saturated or unsaturated alkylene group, cycloalkylene group, cycloalkylalkylene group, It is a cycloalkenylalkylene group, alkenylene group, cycloalkenylene group, cycloalkylalkenylene group, cycloalkenylalkenylene group, arylene group or aralkylene group.
• At least one of R 1 , R 2 and R 3 in general formula (1) is preferably —O—C j H 2j+1
• R 1 , R 2 and At least one of R 3 is preferably -(O-C k H 2k -) a -O-C m H 2m+1 .
• silane coupling agent represented by the general formula (1) examples include 3-(trimethoxysilyl)-1-propanethiol, 3-(triethoxysilyl)-1-propanethiol, 3-(methyl dimethoxysilyl)-1-propanethiol, 2-(trimethoxysilyl)-1-ethanethiol, 2-(triethoxysilyl)-1-ethanethiol, 2-(methyldimethoxysilyl)-1-ethanethiol, (tri methoxysilyl)methanethiol, (triethoxysilyl)methanethiol, (methyldimethoxysilyl)methanethiol, 3-[ethoxybis(3,6,9,12,15-pentoxaoctacosan-1-yloxy)silyl]-1 - Propanethiol ⁇ manufactured by Evonik Degussa, trade name "Si363", [C 13 H 27
• silane coupling agents may be used singly or in combination of two or more.
• silane coupling agents may be used singly or in combination of two or more.
• 3-[ethoxybis(3,6,9,12,15-pentoxaoctacosane-1- Iloxy)silyl]-1-propanethiol is particularly preferred.
• the tire rubber composition of the present invention contains a fatty acid metal salt.
• the fatty acid metal salt acts as a processing aid, suppresses the adhesion of the rubber composition, suppresses the adhesion of the rubber composition to production equipment, and contributes to the improvement of the productivity of the rubber composition.
• Metals used in the fatty acid metal salt include Zn, K, Ca, Na, Mg, Co, Ni, Ba, Fe, Al, Cu, Mn, etc. Zn and K are preferred.
• examples of the fatty acid used in the fatty acid metal salt include saturated or unsaturated fatty acids having 4 to 30 carbon atoms and having a linear, branched or cyclic structure, or mixtures thereof. ⁇ 22 saturated or unsaturated straight chain fatty acids are preferred.
• saturated linear fatty acids having 10 to 22 carbon atoms include capric acid, lauric acid, myristic acid, pentadecanoic acid, palmitic acid, margaric acid, stearic acid, arachidic acid, etc.
• Saturated straight chain fatty acids include undecylenic acid, oleic acid, elaidic acid, cetoleic acid, erucic acid, linoleic acid, linolenic acid, arachidonic acid and the like.
• the fatty acid metal salt may be used singly or in combination of two or more.
• the rubber composition for tires of the present invention comprises the aforementioned rubber component, filler, silane coupling agent, fatty acid metal salt, and, if necessary, various components commonly used in the rubber industry, such as stearic acid. , Zinc oxide (zinc white), waxes, anti-aging agents, resins, softeners, vulcanization accelerators, vulcanizing agents, etc. good. Commercially available products can be suitably used as these compounding agents.
• waxes examples include paraffin wax and microcrystalline wax.
• the content of the wax is not particularly limited, and is preferably in the range of 0.1 to 5 parts by mass, more preferably 1 to 4 parts by mass, per 100 parts by mass of the rubber component.
• the content of the antioxidant is not particularly limited, and is preferably in the range of 0.1 to 5 parts by mass, more preferably 1 to 4 parts by mass, relative to 100 parts by mass of the rubber component.
• the resin examples include C5 - based resins, C9 -based resins, C5 - C9 -based resins, dicyclopentadiene resins, rosin resins, alkylphenol resins, terpenephenol resins, and the like.
• the resin content is not particularly limited, and is preferably in the range of 1 to 40 parts by mass, more preferably 3 to 20 parts by mass, per 100 parts by mass of the rubber component.
• the kneading conditions are not particularly limited, and various conditions such as the input volume of the kneading device, the rotation speed of the rotor, the ram pressure, the kneading temperature, the kneading time, the type of the kneading device, etc. It can be selected as appropriate.
• the kneading device include Banbury mixers, intermixes, kneaders, rolls, etc., which are usually used for kneading rubber compositions.
• the extrusion conditions are also not particularly limited, and various conditions such as extrusion time, extrusion speed, extrusion equipment, and extrusion temperature can be appropriately selected according to the purpose.
• the extrusion device include an extruder or the like that is usually used for extrusion of a rubber composition.
• the extrusion temperature can be determined appropriately.
• the tread rubber of the present invention is characterized by comprising the rubber composition for tires described above. Since the tread rubber of the present invention is made of the above rubber composition for tires, it prevents discoloration of the tire appearance while improving wet grip performance and low rolling resistance of the tire by applying it to the tire. It is possible to The tread rubber of the present invention may be applied to new tires or retreaded tires.
• a tire of the present invention is characterized by comprising the tread rubber described above. Since the tire of the present invention has the above tread rubber, it is excellent in wet grip performance and low rolling resistance, and is less likely to discolor in appearance.
• the tire of the present invention may be obtained by vulcanizing after molding using an unvulcanized rubber composition, or using a semi-vulcanized rubber that has undergone a pre-vulcanization step or the like. After molding, it may be obtained by further vulcanization.
• the tire of the present invention is preferably a pneumatic tire, and the gas to be filled in the pneumatic tire may be normal air or oxygen partial pressure-adjusted air, or an inert gas such as nitrogen, argon, or helium. can be used.
• SBR analysis method The bound styrene content of styrene-butadiene rubber (SBR) was measured by the following method.
• Bound Styrene Amount Using the synthesized styrene-butadiene rubber as a sample, 100 mg of the sample was diluted to 100 mL with chloroform and dissolved to obtain a measurement sample. The amount of bound styrene (% by mass) with respect to 100% by mass of the sample was measured based on the amount of absorption at the ultraviolet absorption wavelength (around 254 nm) by the phenyl group of styrene. As a measuring device, a spectrophotometer "UV-2450" manufactured by Shimadzu Corporation was used.
• n-butyllithium for inactivating residual impurities is added at 0.117 mmol/min, mixed, and then added to the bottom of the reaction group. fed continuously.
• 2,2-bis(2-oxolanyl)propane as a polar substance at a rate of 0.019 g/min and n-butyllithium as a polymerization initiator at a rate of 0.242 mmol/min are vigorously mixed with a stirrer for polymerization. It was fed to the bottom of the reactor to continue the polymerization reaction continuously. The temperature was controlled so that the temperature of the polymerization solution at the reactor top outlet was 75°C.
• the rubber compositions of Examples according to the present invention are excellent in low rolling resistance and wet grip performance, and have no discoloration in appearance.
• Examples 1 and 2 and Comparative Examples 1 and 2 when the content of the fatty acid metal salt exceeds 3.5 parts by mass with respect to 100 parts by mass of the rubber component, the appearance becomes discolored. I understand. Further, from a comparison between Examples 1 and 3 and Comparative Examples 3 and 4, when the content of the silane coupling agent having a thiol group exceeds 10.5 parts by mass with respect to 100 parts by mass of silica, the appearance I know it will be discolored.

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• 2022
  • 2022-09-16 WO PCT/JP2022/034842 patent/WO2023100447A1/ja not_active Ceased
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