Rubber composition and tire

Patent metadata

Field	Value
Publication number	US-2016200902-A1
Application number	US-201414913638-A
Country	US
Kind code	A1
Filing date	Aug 11, 2014
Priority date	Aug 23, 2013
Publication date	Jul 14, 2016
Grant date	—

Abstract

The present invention provides a rubber composition capable of producing a rubber molded article that is excellent in rolling resistance performance, steering stability, mechanical strength and abrasion resistance, and a tire obtained by using the rubber composition in at least a part thereof. The present invention relates to a rubber composition including (A) a rubber component including at least one rubber selected from the group consisting of a synthetic rubber and a natural rubber, (B) silica and (C) a modified polymer of farnesene obtained by introducing a functional group into a polymer of farnesene, in which a content of the silica (B) in the rubber composition is from 20 to 150 parts by mass on the basis of 100 parts by mass of the rubber component (A), and a content of the modified farnesene polymer (C) in the rubber composition is from 2 to 10 parts by mass on the basis of 100 parts by mass of the silica (B).

First claim

1 . A rubber composition comprising (A) a rubber component comprising at least one rubber selected from the group consisting of a synthetic rubber and a natural rubber, (B) silica and (C) a modified polymer of farnesene obtained by introducing a functional group into a polymer of farnesene, in which a content of the silica (B) in the rubber composition is from 20 to 150 parts by mass on the basis of 100 parts by mass of the rubber component (A), and a content of the modified polymer (C) in the rubber composition is from 2 to 10 parts by mass on the basis of 100 parts by mass of the silica (B).

2 . The rubber composition according to claim 1 , wherein the functional group of the modified polymer (C) is at least one group selected from the group consisting of a carboxy group, an amino group, a hydroxy group and a functional group derived from an acid anhydride.

3 . The rubber composition according to claim 1 , wherein the silica (B) has an average particle size of from 0.5 to 200 nm.

4 . The rubber composition according to claim 1 , wherein the modified polymer (C) has a melt viscosity of from 0.1 to 3,000 Pa·s as measured at 38° C.

5 . The rubber composition according to claim 1 , wherein the modified polymer (C) has a weight-average molecular weight (Mw) of from 2,000 to 500,000.

6 . The rubber composition according to claim 1 , wherein the modified polymer (C) is a copolymer constituted of (c1) a monomer unit derived from β-farnesene and (c2) a monomer unit derived from a monomer other than β-farnesene.

7 . The rubber composition according to claim 1 , further comprising a silane coupling agent in an amount of from 0.1 to 30 parts by mass on the basis of 100 parts by mass of the silica (B).

8 . The rubber composition according to claim 1 , wherein the rubber component (A) comprises at least one rubber selected from the group consisting of a styrene-butadiene rubber and a natural rubber.

9 . The rubber composition according to claim 8 , wherein the rubber component (A) comprises the styrene-butadiene rubber, which has a weight-average molecular weight of from 100,000 to 2,500,000.

10 . The rubber composition according to claim 8 , wherein the rubber component (A) comprises the styrene-butadiene rubber, which has a styrene content of from 0.1 to 70% by mass.

11 . A tire comprising the rubber composition according to claim 1 in at least a part thereof.

Assignees

• Kuraray Co
• Amyris Inc

Inventors

• Koda Daisuke
• Hirata Kei

Classifications

• C08L23/24

  having ten or more carbon atoms · CPC title

• C08K5/54

  Silicon-containing compounds {(C08K5/0091 takes precedence)} · CPC title

• C08K3/36

  Silica · CPC title

• C08L7/00 Primary

  Compositions of natural rubber · CPC title

• C08L9/06 Primary

  Copolymers with styrene · CPC title