Rubber composition and pneumatic tire using same

Patent metadata

Field	Value
Publication number	US-10487198-B2
Application number	US-201615735152-A
Country	US
Kind code	B2
Filing date	Jun 10, 2016
Priority date	Jun 12, 2015
Publication date	Nov 26, 2019
Grant date	Nov 26, 2019

Abstract

A rubber composition contains a diene rubber containing a styrene-butadiene copolymer component including a styrene-butadiene copolymer and a reinforcing filler. (1) The content of bonded styrene is from 5 to 50 wt. %. (2) The total content of styrene of an ozone decomposed component S1 including one styrene-derived unit and an ozone decomposed component S1V1 including one styrene-derived unit and one 1,2-bonded butadiene-derived unit is less than 80 wt. % of the amount of bonded styrene. The total content of styrene of the decomposed component S1V1 is less than 10 wt. % of the amount of bonded styrene. (3) The integrated intensity of an ozone decomposed component S1V2 including one styrene-derived unit and two 1,2-bonded butadiene-derived units is not less than 15% of the integrated intensity of all the decomposed components including styrene-derived units. (4) The vinyl content of a butadiene portion is not less than 20% and less than 50%.

First claim

The invention claimed is:

1. A rubber composition comprising a diene rubber including at least one styrene-butadiene copolymer and a reinforcing filler, wherein a styrene-butadiene copolymer component including the at least one styrene-butadiene copolymer has the characteristics of (1) to (4):
(1) a content of bonded styrene is from 5 to 50 wt. %;
(2) when a decomposed component Si including one styrene-derived unit and a decomposed component S 1 V 1 including one styrene-derived unit and one 1,2-bonded butadiene-derived unit are measured by gel permeation chromatography as decomposed components obtained by ozone decomposition, a total content of styrene of the decomposed component S 1 and the decomposed component S 1 V 1 is less than 80 wt. % of the amount of bonded styrene, and a total content of styrene of the decomposed component S 1 V 1 is less than 10 wt. % of the amount of bonded styrene;
(3) when the decomposed components obtained by ozone decomposition are measured by a liquid chromatography-mass spectrometer, an integrated intensity of a decomposed component S 1 V 2 including one styrene-derived unit and two 1,2-bonded butadiene-derived units is not less than 15% of an integrated intensity of all the decomposed components including styrene-derived units; and
(4) a vinyl content of a butadiene portion is not less than 20% and less than 50%;
wherein the decomposed component S 1 is represented by following general formula (I):

the decomposed component S 1 V 1 is represented by at least one selected from following general formulae (II) and (III):

and
the decomposed component S 1 V 2 is represented by at least one selected from following general formulae (IV) through (VI):

2. The rubber composition according to claim 1 , wherein the diene rubber further contains at least one selected from natural rubber, polyisoprene, and polybutadiene.

3. The rubber composition according to claim 1 , wherein the reinforcing filler is at least one selected from silica and carbon black.

4. A pneumatic tire using the rubber composition according to claim 1 .

5. The pneumatic tire according to claim 4 , wherein the rubber composition is used in a cap tread.

6. The rubber composition according to claim 2 , wherein the reinforcing filler is at least one selected from silica and carbon black.

7. A pneumatic tire using the rubber composition according to claim 6 .

8. The pneumatic tire according to claim 7 , wherein the rubber composition is used in a cap tread.

Assignees

• Yokohama Rubber Co Ltd

Inventors

• Sekine Yuko
• Ashiura Makoto
• Sakai Ryosuke
• Yatsuyanagi Fumito

Classifications

• C08L2205/025

  containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure · CPC title

• C08K3/36

  Silica · CPC title

• C08K3/04

  Carbon · CPC title

• C08L9/06 Primary

  Copolymers with styrene · CPC title

• C08L2205/03

  containing three or more polymers in a blend · CPC title