Additive for rubber composition, additive composition for rubber composition, rubber composition and tire
AssigneesBridgestone Corporation, Kao Corporation
InventorsDaisuke Nohara, Jingo Shirasaka, Isao Nishi, Masaaki Tsuchihashi, Tetsuo Takano
Life of this patent
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Abstract
An additive for a rubber composition consists essentially of an ester of (i) an aliphatic polyvalent carboxylic acid with (iii) a (poly)oxyalkylene derivative, and having at least one carboxyl group in its molecule, or an ester of (ii) an aromatic polyvalent carboxylic acid with (iii) a (poly)oxyalkylene derivative, and having at least one carboxyl group bonded to an aromatic ring in its molecule. And also, it relates to an additive composition, a rubber composition and a pneumatic tire using such an additive for a rubber composition.
Claims19
An additive for a rubber composition consisting essentially of an ester selected from an ester of (i) an aliphatic polyvalent carboxylic acid with (iii) a (poly)oxyalkylene derivative, and having at least one carboxyl group in its molecule and represented by the following formula (I):
- wherein m is a number of not less than 1 indicating an average degree of polymerization, and each of n and p is an integer of not less than 1, and X is a saturated or unsaturated aliphatic chain, and R1 is an alkylene group and R2 is a hydrocarbon group selected from the group consisting of alkyl group, an alkenyl group, an alkylaryl group and an acyl group, and an ester of (ii) an aromatic polyvalent carboxylic acid with (iii) a (poly)oxyalkylene derivative, and having at least one carboxyl group bonded to an aromatic ring in its molecule and represented by the following formula (II)
- wherein q is a number of not less than 1 indicating an average degree of polymerization, and each of r and s is an integer of not less than 1, and t is 0 or an integer of not less than 1, and r+s+t is 6-8, and Y is an aromatic ring, and R3 is an alkylene group, R4 is a hydrocarbon group selected from the group consisting of an alkyl group, an alkenyl group and an alkylaryl group and R5 is a hydrogen, an alkyl group or an alkenyl group.
An additive composition for a rubber composition comprising (a) a reinforcing filler and (b) an ester selected from an ester of (i) an aliphatic polyvalent carboxylic acid with (iii) a (poly)oxyalkylene and having at least one carboxyl group in its molecule, and an ester of (ii) an aromatic polyvalent carboxylic acid with (iii) a (poly)oxyalkylene and having at least one carboxyl group bonded to an aromatic ring in its molecule, in which a compounding ratio by weight of the component (a) to the component (b) is 70/30 to 30/70.
A rubber composition comprising a rubber ingredient and an ester selected from an ester of (i) an aliphatic polyvalent carboxylic acid with (iii) a (poly)oxyalkylene and having at least one carboxyl group in its molecule, and an ester of (ii) an aromatic polyvalent carboxylic acid with (iii) a (poly)oxyalkyene and having at least one carboxyl group bonded to an aromatic ring in its molecule.
A rubber composition comprising (A) a rubber ingredient and (B) an additive composition for a rubber composition consisting of (a) a reinforcing filler and (b) an ester selected from an ester of an aliphatic polyvalent carboxylic acid with a (poly)oxyalkylene and having at least one carboxyl group in its molecule and an ester of an aromatic polyvalent carboxylic acid with a (poly)oxyalkylene having at least one carboxyl group bonded to an aromatic ring in its molecule.
Dependencies are inferred from the claim text.