Abstract: To provide a rubber composition in which wet performance, wear resistance, low rolling resistance, and breaking resistance are highly balanced. A rubber composition comprising a rubber component comprising at least three polymers and a filler, wherein the rubber component is separated into at least two polymer phases: a polymer phase (1) with the highest tan ? peak temperature; and a polymer phase (2) with the lowest peak temperature; the polymer phases (1) and (2) are incompatible with each other; the polymer phase (1) at least comprises the modified conjugated diene-based polymers (A1) and (A2), and the filler; the modified conjugated diene-based polymer (A1) has a particular weight-average molecular weight and a particular contracting factor (g?); and when a filler concentration and an average aggregate area of the filler in the polymer phase (1) are defined as X and Y, respectively, an formula (1): Y<4.8X+1200 is satisfied.

Abstract: To provide a rubber composition in which wet performance, wear resistance, low rolling resistance, and breaking resistance are highly balanced. A rubber composition comprising a rubber component comprising at least three polymers and a filler, wherein the rubber component is separated into at least two polymer phases: a polymer phase (1) with the highest tan ? peak temperature; and a polymer phase (2) with the lowest peak temperature; the polymer phases (1) and (2) are incompatible with each other; the polymer phase (1) at least comprises the modified conjugated diene-based polymers (A1) and (A2), and the filler; the modified conjugated diene-based polymer (A1) has a particular weight-average molecular weight and a particular contracting factor (g?); and when a filler concentration and an average aggregate area of the filler in the polymer phase (1) are defined as X and Y, respectively, an formula (1): Y<4.8X+1200 is satisfied.

Abstract: The rubber composition of this disclosure is a rubber composition comprising a rubber component containing 2 or more polymer components and a filler containing at least a silica, wherein: the rubber component is separated into two or more polymer phases with different peak temperatures of tan ? temperature dispersion curve; a compounding amount of the filler per 100 parts by mass of the rubber component is 30 to 130 parts by mass; 30 mass % or more of the filler exists in the polymer phase with the lowest peak temperature of tan ? temperature dispersion curve; and the filler has an average aggregate area of 2100 nm2 or less.

Abstract: A method for producing a polymer according to the present invention is a method for producing a polymer having at least two peaks in a molecular weight distribution curve of the polymer obtained by measurement of molecular weight by GPC, and comprising a conjugated diene-based polymer or a copolymer of an aromatic vinyl compound and a diene-based compound, the method using a reaction apparatus comprising two or more continuous polymerization reactors connected in series, and comprising introducing a monomer component and a polymerization initiator into a first reactor for a polymerization reaction, and then adding the monomer component and the polymerization initiator before each of the second and subsequent reactors for polymerization, a weight average molecular weight of a polymer (A) obtained in the first reactor being 300,000 to 2,000,000.

Abstract: The present disclosure provides a method for manufacturing with high productivity a modified polymer equivalent to the prior art blend of a modified polymer for matrix of a rubber composition and the low-molecular weight polymer. Specifically, a method for manufacturing a modified polymer, including continuously supplying a raw material monomer containing at least conjugated diene compound, a polymerization initiator containing lithium, 1,2-butadiene and a modification agent into a flow-through reactor, causing the raw material monomer to be continuously polymerized to generate polymer and also causing a portion of the polymer thus generated to be modified with the modification agent, is characterized in that: the polymerization and the modification are carried out at temperature equal to 110° C. or higher; and a mole ratio (1,2-Bd/Li) of the 1,2-butadiene (1,2-Bd) with respect to lithium (Li) of the polymerization initiator containing lithium is set to be 0.37 or less.

Abstract: The rubber composition of this disclosure is a rubber composition comprising a rubber component containing 2 or more polymer components and a filler containing at least a silica, wherein: the rubber component is separated into two or more polymer phases with different peak temperatures of tan ? temperature dispersion curve; a compounding amount of the filler per 100 parts by mass of the rubber component is 30 to 130 parts by mass; 30 mass % or more of the filler exists in the polymer phase with the lowest peak temperature of tan ? temperature dispersion curve; and the filler has an average aggregate area of 2100 nm2 or less.

Abstract: This disclosure is to provide a rubber composition excellent in low loss property and wear resistance without deteriorating the processability. The rubber composition of this disclosure contains a rubber component having a diene-based polymer, a silica, and a glycerin fatty acid ester composition, wherein: the diene-based polymer has 3 or more modified functional groups capable of interacting with the silica merely within a range of ¼ of an entire chain length from a terminal, and has at least one monomer structural unit of a diene-based polymer among the modified functional groups; and the glycerin fatty acid ester composition has a glycerin fatty acid monoester and a glycerin fatty acid diester of C8 to C28 fatty acids, and a content of the glycerin fatty acid ester composition is 0.5 to 15 parts by mass per 100 parts by mass of the rubber component.

Abstract: The present invention provides a method for producing a rubber composition containing a rubber component (A) which contains a copolymer of a conjugated diene compound and an aromatic vinyl compound, in which the conjugated diene compound amount in the copolymer is 50% by mass or more and 73% by mass or less and the molecular weight at the peak top of the molecular weight distribution of the polystyrene-equivalent number-average molecular weight of the copolymer as measured through gel permeation chromatography is 100,000 or more and 600,000 or less, a filler containing an inorganic filler (B), a silane coupling agent (C) and at least one accelerator (D) selected from guanidines, sulfenamides, thiazoles, thiurams, thioureas, dithiocarbamates and xanthates, wherein the rubber composition is kneaded in plural stages, and in the first stage (X) of kneading, the rubber component (A), all or a part of the inorganic filler (B), all or a part of the silane coupling agent (C) and the accelerator (D) are added and knea

Abstract: A method of making a polymer with stable Mooney viscosity and molecular weight is described. A conjugated diolefin is reacted in a hydrocarbon solvent in the presence of an initiator to form a polymer. After forming the polymer, alkoxy silane terminal functionalizing groups are bonded to the polymer. A dialkoxysilane stabilizing agent is then added to the polymer in combination with a base material. The polymer is then desolvatizing, resulting in a polymer with stable Mooney viscosity and molecular weight, even over prolonged periods of time. Compositions and articles containing the polymer are also described.

Abstract: A method of making a polymer with stable Mooney viscosity is described. A conjugated diolefin is reacted in a hydrocarbon solvent in the presence of an initiator to form a polymer. After forming the polymer, alkoxysilane terminal functionalizing groups are bonded to the polymer. An alkoxysilane stabilizing agent is then added to the polymer in the presence of hydrocarbon oil. The polymer is then desolvatized, resulting in a polymer with stable Mooney viscosity, even over prolonged periods of time. Compositions and articles containing the polymer are also described.

Abstract: Provided are a modifying agent obtained by subjecting a silicon-containing compound having a protected primary amino group and at least two hydrolyzable groups to complete condensation, a method of producing a modified conjugated diene-based polymer, a modified conjugated diene-based polymer obtained by the production method, a rubber composition using the polymer, and a pneumatic tire. The modified conjugated diene-based polymer has excellent low heat generating property and abrasion resistance, and the rubber composition is obtained by using the modified conjugated diene-based polymer and the pneumatic tire is obtained by using the rubber composition.

Abstract: A process for producing functional polymer, the process comprising the steps of reacting an anionic initiator including a functional group with a stabilizing monomer to produce a stabilized initiator, reacting the stabilized initiator with monomer capable of being anionically polymerized to produce a polymer, and terminating the polymer.

Abstract: A method of making a polymer with stable Mooney viscosity and molecular weight is described. A conjugated diolefin is reacted in a hydrocarbon solvent in the presence of an initiator to form a polymer. After forming the polymer, alkoxy silane terminal functionalizing groups are bonded to the polymer. A dialkoxysilane stabilizing agent is then added to the polymer in combination with a base material. The polymer is then desolvatizing, resulting in a polymer with stable Mooney viscosity and molecular weight, even over prolonged periods of time. Compositions and articles containing the polymer are also described.

Abstract: A method of making a polymer with stable Mooney viscosity is described. A conjugated diolefin is reacted in a hydrocarbon solvent in the presence of an initiator to form a polymer. After forming the polymer, alkoxysilane terminal functionalizing groups are bonded to the polymer. An alkoxysilane stabilizing agent is then added to the polymer in the presence of hydrocarbon oil. The polymer is then desolvatized, resulting in a polymer with stable Mooney viscosity, even over prolonged periods of time. Compositions and articles containing the polymer are also described.

Abstract: Provided are a modifying agent obtained by subjecting a silicon-containing compound having a protected primary amino group and at least two hydrolyzable groups to complete condensation, a method of producing a modified conjugated diene-based polymer, a modified conjugated diene-based polymer obtained by the production method, a rubber composition using the polymer, and a pneumatic tire. The modified conjugated diene-based polymer has excellent low heat generating property and abrasion resistance, and the rubber composition is obtained by using the modified conjugated diene-based polymer and the pneumatic tire is obtained by using the rubber composition.

Abstract: A method for preparing a functionalized polymer, the method comprising the step of reacting a reactive polymer with a functionalizing agent defined by formula I or formula II: or combinations thereof, where R1, R2, and R3 are each independently a divalent organic group, R4 and R5 are each independently a monovalent organic group, a is an integer from 0 to 1, x is an integer from 0 to 2, y is an integer from 1 to 3, x+y=3, and ? is a protected amino group.

Abstract: A process for producing functional polymer, the process comprising the steps of reacting an anionic initiator including a functional group with a stabilizing monomer to produce a stabilized initiator, reacting the stabilized initiator with monomer capable of being anionically polymerized to produce a polymer, and terminating the polymer.

Abstract: Provided are a modifying agent obtained by subjecting a silicon-containing compound having a protected primary amino group and at least two hydrolyzable groups to complete condensation, a method of producing a modified conjugated diene-based polymer, a modified conjugated diene-based polymer obtained by the production method, a rubber composition using the polymer, and a pneumatic tire. The modified conjugated diene-based polymer has excellent low heat generating property and abrasion resistance, and the rubber composition is obtained by using the modified conjugated diene-based polymer and the pneumatic tire is obtained by using the rubber composition.

Abstract: A method for preparing a functionalized polymer, the method comprising the step of reacting a reactive polymer with a functionalizing agent defined by formula I or formula II: or combinations thereof, where R1, R2, and R3 are each independently a divalent organic group, R4 and R5 are each independently a monovalent organic group, a is an integer from 0 to 1, x is an integer from 0 to 2, y is an integer from 1 to 3, x+y=3, and ? is a protected amino group.

Abstract: The present invention provides an electronic component which can reduce the size of a capacitor and the number of constitutional parts of the capacitor without using a case. The electronic component of the present invention includes a capacitor element, an outer package made of a norbornene resin covering the capacitor element, and external connection terminal portions electrically connected to the capacitor element and protruded from the outer package.