Rubber composition and process for production thereof, and tire

1. A rubber composition, comprising:

(A) a conjugated diene rubber which is obtained by polymerizing a conjugated diene compound or polymerizing a conjugated diene compound and an aromatic vinyl compound, the conjugated diene rubber comprising a group comprising an active hydrogen and a group capable of chemically binding to silica;

(B) a silica;

(C) a silane coupling agent (I) capable of reacting with a carbon-carbon double bond of the conjugated diene in the conjugated diene rubber; and

(D) a silane coupling agent (II) capable of reacting with the group comprising an active hydrogen;

wherein the group comprising an active hydrogen comprises at least one of a primary amino group, a secondary amino group, an imino group, a primary phosphino group, a secondary phosphino group, and a thiol group.

2. A method for producing the rubber composition of claim 1 , the method comprising mixing the conjugated diene rubber (A), the silica (B), the silane coupling agent (C) and the silane coupling agent (D), to form a rubber composition.

3. The method according to claim 2 , wherein the component (C) comprises at least one selected from the group consisting of sulfur, a carbon-carbon double bond, and a carbon-carbon triple bond.

4. The method according to claim 2 , wherein the group capable of reacting with the group comprising an active hydrogen in the component (D) comprises at least one selected from the group consisting of an epoxy group, a methacryloyloxy group, an acryloyloxy group, a carboxyl group, an isocyanate group, an aldehyde group, and an acyl group.

5. The method according claim 2 , wherein the component (A) further comprises at least one selected from the group consisting of a tertiary amino group, a tertiary phosphino group, and a pyridyl group.

6. The method according to claim 5 , wherein the component (A) comprises an onium structure formed from at least one selected from the group consisting of a primary amino group, a secondary amino group, a tertiary amino group, an imino group, a pyridyl group, a primary phosphino group, a secondary phosphino group, a tertiary phosphino group, and a thiol group.

7. The method according to claim 2 , wherein the group capable of chemically binding to a silica in the component (A) is a hydrocarbyloxysilyl group or a silanol group.

8. The method according to claim 2 , wherein the component (C) is at least one selected from the group consisting of compounds represented by the following formulae (1-a) to (1-c):

wherein:

R 1 and R 2 independently represent a group represented by R 10 O— or an alkylpolyether group represented by —O—(R 11 —O) n —R 12 ;

R 10 is a hydrogen atom, a monovalent hydrocarbon group having 1 to 30 carbon atoms, or a group represented by (R 13 ) 3 SiR 14 ;

R 13 is an alkyl group or alkenyl group having 1 to 30 carbon atoms;

R 14 is a divalent hydrocarbon group having 1 to 30 carbon atoms;

R 11 independently represents a divalent hydrocarbon group having 1 to 30 carbon atoms;

n is from 1 to 30;

R 12 is a monovalent hydrocarbon group having at least 3 carbon atoms;

R 3 independently represents a group represented by R 10 O— or a monovalent hydrocarbon group having 1 to 30 carbon atoms;

R 4 independently represents a divalent hydrocarbon group having 1 to 30 carbon atoms;

R 5 is a hydrogen atom, a monovalent hydrocarbon group having 1 to 30 carbon atoms, a group represented by —CN, or a group represented by —(C=0)-R 15 ;

R 15 is a monovalent hydrocarbon group having 1 to 30 carbon atoms;

R 16 is a group represented by the formula: —(R 18 —O) p —R 19 ;

R 18 and R 19 independently represent a divalent hydrocarbon group having 1 to 12 carbon atoms;

p is from 0 to 30 in average;

R 17 is a monovalent hydrocarbon group having 1 to 12 carbon atoms, a formula —(R 20 —O) q —H, or a binding group —(R 21 —O) q-1 —R 22 obtained by dehydrative condensation of —(R 20 —O) q —H;

R 20 and R 21 independently represent a divalent hydrocarbon group having 1 to 12 carbon atoms;

R 22 is a divalent hydrocarbon group having 1 to 12 carbon atoms;

q is from 1 to 30 in average;

x is an integer of 1 to 20; and

y is an integer of 5 to 10,000.

9. The method according to claim 2 , wherein the component (D) is a compound represented by formula (2):

wherein:

R 6 and R 7 independently represent a group represented by R 10 O— or an alkylpolyether group represented by the formula: —O—(R 11 —O) n —R 12 ;

R 10 is a hydrogen atom, a monovalent hydrocarbon group having 1 to 30 carbon atoms, or a group represented by: (R 13 ) 3 SiR 14 ;

R 13 is an alkyl group or alkenyl group having 1 to 30 carbon atoms;

R 14 is a divalent hydrocarbon group having 1 to 30 carbon atoms;

R 11 independently represents a divalent hydrocarbon group having 1 to 30 carbon atoms;

n is from 1 to 30;

R 12 is a monovalent hydrocarbon group having at least 3 carbon atoms;

R 8 independently represents a group represented by R 10 O— or a monovalent hydrocarbon group having 1 to 30 carbon atoms;

R 9 independently represents a divalent hydrocarbon group having 1 to 30 carbon atoms;

m is an integer of 1 or 2; and

A comprises one or more functional group structures selected from the group consisting of an epoxy group, a methacryloyloxy group, an acryloylaxy group, a carboxyl group, an isocyanate group, an aldehyde group, and an acyl group.

10. A rubber composition obtained by the method according to claim 2 .

11. A tire obtained by crosslinking and molding the rubber composition according to claim 10 .