Rubber composition and method of producing same, and tire

Patent metadata

Field	Value
Publication number	US-9862815-B2
Application number	US-201113877071-A
Country	US
Kind code	B2
Filing date	Sep 30, 2011
Priority date	Oct 1, 2010
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

Abstract

The present invention provides a rubber composition that comprises a rubber component containing a polybutadiene and a dienic rubber or an olefinic rubber immiscible with the polybutadiene, and a filler, in which the Mooney viscosity (ML 1+4 /100° C.) of the polybutadiene referred to as ML(I), and the Mooney viscosity (ML 1+4 /100° C.) of the dienic rubber or the olefinic rubber immiscible with the polybutadiene referred to as ML(II) are in a relation of ML(I)≧ML(II), a method for producing the rubber composition and a tire using the rubber composition. The rubber composition is excellent in fracture resistance and capable of attaining good workability not lowering the durability such as abrasion resistance and the like of tires, and can reduce the rolling resistance of tires.

First claim

The invention claimed is:

1. A rubber composition which comprises a rubber component containing a polybutadiene and an additional rubber immiscible with the polybutadiene chosen from the group consisting of dienic rubbers and olefinic rubbers, and a filler, and in which the Mooney viscosity (ML 1+4 /100° C.) of the polybutadiene referred to as ML(I), and the Mooney viscosity (ML 1+4 /100° C.) of the dienic rubber or the olefinic rubber immiscible with the polybutadiene referred to as ML(II) are in a relation of ML(I)≧ML(II) prior to the polybutadiene and the dienic or olefinic rubber being combined in the rubber composition, wherein the polybutadiene is one processed to have an increased molecular weight through coupling treatment, and ML(I) is within a range of from 50 to 90 and ML(II) is within a range of from 40 to 85.

2. The rubber composition according to claim 1 , wherein the dienic rubber immiscible with the polybutadiene is a natural rubber or a polyisoprene rubber.

3. The rubber composition according to claim 1 , wherein the content mass ratio (A/B) of the content mass A of the polybutadiene to the content mass B of the dienic rubber or the olefinic rubber immiscible with the polybutadiene falls within a range of from 40/60 to 60/40.

4. The rubber composition according to claim 1 , wherein the polybutadiene is a modified polybutadiene.

5. The rubber composition according to claim 4 , wherein the modified polybutadiene is modified with a functional group having an affinity for at least one selected from carbon black and an inorganic filler.

6. The rubber composition according to claim 4 , wherein the modified polybutadiene is modified with a functional group having an affinity for at least one selected from carbon black and an inorganic filler.

7. The rubber composition according to claim 1 , wherein the content of the filler is from 30 parts by mass to 70 parts by mass per 100 parts by mass of the rubber component.

8. The rubber composition according to claim 1 , wherein the filler is at least one selected from carbon black and an inorganic filler.

9. The rubber composition according to claim 1 , wherein the 1,2-vinyl bond content in the polybutadiene is at most 20%.

10. A tire using the rubber composition of claim 1 .

11. A method for producing the rubber composition of claim 1 , comprising a step of kneading a rubber component containing a polybutadiene and a dienic rubber or an olefinic rubber immiscible with the polybutadiene, and a filler;
wherein the polybutadiene to be used is one having a Mooney viscosity (ML 1+4 /100° C.) not smaller than that of the dienic rubber or the olefinic rubber immiscible with the polybutadiene.

12. The method for producing the rubber composition according to claim 11 , wherein the polybutadiene is a modified polybutadiene.

13. The method for producing the rubber composition according to claim 11 , wherein the Mooney viscosity (ML 1+4 /100° C.) of the dienic rubber or the olefinic rubber immiscible with the polybutadiene is from 45 to 75.

Assignees

• Matsushita Junko
• Bridgestone Corp

Inventors

• Matsushita Junko

Classifications

• B60C1/00

  Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition · CPC title

• B60C1/0025

  Compositions of the sidewalls · CPC title

• C08L7/00

  Compositions of natural rubber · CPC title

• B60C1/0016

  Compositions of the tread · CPC title

• C08K3/013

  Fillers, pigments or reinforcing additives · CPC title