Abstract: The present disclosure aims at providing an EPDM-containing rubber composition capable of exhibiting excellent adhesion to a metal member without necessitating inclusion of a cobalt salt of organic acid therein. Specifically, a rubber composition includes therein: a rubber component containing ?20 phr of EPDM; a rubber-metal adhesion promoter; a vulcanization accelerator other than a thiuram-based compound; and no thiuram-based vulcanization accelerator, wherein the rubber-metal adhesion promoter contains a specifically formulated metal salt of aliphatic carboxylic acid.

Abstract: Provided is a rubber composition comprising at least NBR as a rubber component and having rubber-metal adhesiveness equal to or higher than that of a rubber composition comprising a cobalt salt. The rubber composition comprises a rubber component, and a rubber-metal adhesion promoter, where the rubber component comprises at least 10 parts by mass of NBR per 100 parts by mass of the rubber component, the rubber-metal adhesion promoter comprises at least one selected from the group consisting of a metal salt of an aliphatic carboxylic acid (1) and a compound (2) having a specific structure.

Abstract: Provided is a rubber composition comprising at least CR as a rubber component and having rubber-metal adhesiveness equal to or higher than that of a rubber composition comprising a cobalt salt. The rubber composition comprises a rubber component, and a rubber-metal adhesion promoter, where the rubber component comprises at least 10 parts by mass of CR per 100 parts by mass of the rubber component, the rubber-metal adhesion promoter comprises at least one selected from the group consisting of a metal salt of an aliphatic carboxylic acid (1) and a compound (2) having a specific structure.

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: 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.