Rubber composition, method for producing same, and tire

Patent metadata

Field	Value
Publication number	US-9365704-B2
Application number	US-201213984753-A
Country	US
Kind code	B2
Filing date	Feb 9, 2012
Priority date	Feb 9, 2011
Publication date	Jun 14, 2016
Grant date	Jun 14, 2016

Abstract

A method for producing a rubber composition includes kneading: a rubber component comprising a conjugated diene polymer having at least one functional group selected from the group consisting of a thiol group, an oxetane group and a hydrocarbylthio group; silica particles; and a catalyst for condensing silanol to form an aggregate of the silica particles. Preferably, at least one polymer selected from the group consisting of a conjugate diene polymer having no functional group bondable to silica, and a polymer having no functional group bondable to silica and the polymer being other than conjugated diene polymer is also kneaded as a rubber component other than the conjugated diene polymer.

First claim

The invention claimed is:

1. A method for producing a rubber composition, the method comprising kneading:
a rubber component comprising a conjugated diene polymer having at least one functional group selected from the group consisting of a thiol group, an oxetane group and a hydrocarbylthio group;
silica particles; and
a catalyst for condensing silanol of the silica particles to form an aggregate of the silica particles.

2. The method according to claim 1 , wherein at least one polymer selected from the group consisting of a conjugate diene polymer having no functional group bondable to silica, and a polymer having no functional group bondable to silica, the polymer being other than conjugated diene polymer is also kneaded as a rubber component other than the conjugated diene polymer.

3. The method according to claim 2 , wherein the at least one polymer, a part or the whole of the silica particles, and the catalyst are initially kneaded to add the conjugated diene polymer thereto, followed by kneading.

4. The method according to claim 1 , wherein the catalyst includes an acylate compound comprising iron, an alkoxide comprising iron, or an acetylacetonate complex salt of iron.

5. The method according to claim 4 , wherein a content of the catalyst is from 0.5 to 5 parts by mass based on 100 parts by mass of the silica particles.

6. The method according to claim 1 , wherein a content of the catalyst is from 0.5 to 5 parts by mass based on 100 parts by mass of the silica particles.

7. The method according to claim 1 , wherein a content of the silica particles is preferably from 20 to 100 parts by mass based on 100 parts by mass of a total of the conjugated diene polymer and the at least one polymer.

8. A rubber composition obtained by kneading:
a rubber component comprising a conjugated diene polymer having at least one functional group selected from the group consisting of a thiol group, an oxetane group and a hydrocarbylthio group;
silica particles; and
a catalyst for condensing silanol of the silica particles to form an aggregate of the silica particles.

9. The rubber composition according to claim 8 , which is obtained by kneading at least one polymer selected from the group consisting of a conjugate diene polymer having no functional group bondable to silica, and a polymer having no functional group bondable to silica, the polymer being other than conjugated diene polymer, as a rubber component other than the conjugated diene polymer, together with the conjugated diene polymer, the catalyst and the silica particles.

10. The rubber composition according to claim 9 , which is obtained by initially kneading the at least one polymer, a part or the whole of the silica particles, and the catalyst to add the conjugated diene polymer thereto, followed by the kneading.

11. A kneaded rubber composition comprising:
silica particles;
a catalyst for condensing silanol of the silica particles to form an aggregate of the silica particles; and
a rubber component comprising a conjugated diene polymer having at least one functional group selected from the group consisting of a thiol group, an oxetane group and a hydrocarbylthio group.

12. A tire, comprising a tread obtained from the rubber composition according to claim 8 .

13. A tire, comprising a tread obtained from the rubber composition according to claim 9 .

14. A tire, comprising a tread obtained from the rubber composition according to claim 10 .

15. A tire, comprising a tread obtained from the kneaded rubber composition according to claim 11 .

Assignees

• Shibata Masahiro
• Okada Koji
• Jsr Corp

Inventors

• Shibata Masahiro
• Okada Koji

Classifications

• C08K3/36

  Silica · CPC title

• B60C1/0016

  Compositions of the tread · CPC title

• C08L15/00 Primary

  Compositions of rubber derivatives (C08L11/00, C08L13/00 take precedence) · CPC title

• C08L9/00 Primary

  Compositions of homopolymers or copolymers of conjugated diene hydrocarbons · CPC title

• C08K5/0091

  Complexes with metal-heteroatom-bonds · CPC title