Halogenated diene rubber for tires

Patent metadata

Field	Value
Publication number	US-9657157-B2
Application number	US-201314401760-A
Country	US
Kind code	B2
Filing date	May 15, 2013
Priority date	May 15, 2012
Publication date	May 23, 2017
Grant date	May 23, 2017

Abstract

A rubber composition is provided that includes a partially halogenated diene polymer that has a controllable microstructure, and no more than about 50% of the n repeat units are in blocks of three or more consecutive units. In embodiments, a reinforcing filler is also included in the rubber composition. In embodiment, the rubber composition is formed into a tire component. A method of making the composition is also provided.

First claim

What is claimed is:

1. A rubber composition comprising:
a partially halogenated diene polymer, including n repeat units of one or more of the following formulae I-VI:

wherein X is a halogen, each R is independently selected from H or a C 1 to C 20 alkyl group;
no more than about 50% of the n repeat units are in blocks of three or more consecutive units; and

a reinforcing filler.

2. The rubber composition of claim 1 , further comprising a vulcanizing agent.

3. The rubber composition of claim 1 , further comprising remnants of a phosphorus-based halogenating agent.

4. The rubber composition of claim 1 , wherein the gel content of the partially halogenated diene polymer is less than about 5%.

5. The rubber composition of claim 1 , wherein the partially halogenated diene polymer is halogenated in a percentage of about 1% to about 70%.

6. The rubber composition of claim 1 , wherein the reinforcing filler is silica.

7. The rubber composition of claim 1 , wherein the partially halogenated diene polymer is a solution synthesized polymer.

8. The composition of claim 1 , wherein the halogenated diene polymer is cis-1,4 polybutadiene having a cis content of about 80% to about 99.9%.

9. The composition of claim 1 , wherein the n repeat units include at least one of formula I and formula II.

10. The rubber composition of claim 1 , wherein the partially halogenated diene rubber exhibits a single glass transition peak.

11. A tire comprising:
a tire tread component comprising a rubber composition comprising:

a partially halogenated diene polymer, including n repeat units of one or more of the following formulae I-VI:

wherein X is a halogen, each R is independently selected from H or a C 1 to C 20 alkyl group; and
no more than about 50% of the n repeat units are in blocks of three or more consecutive units.

12. The tire of claim 11 , wherein the n repeat units include at least one of formula I and formula II.

13. The tire of claim 11 , wherein the gel content of the partially halogenated diene polymer is less than about 5%.

14. The tire of claim 11 , wherein the partially halogenated diene polymer is halogenated to a percentage of about 1% to about 70%.

15. The tire of claim 11 , wherein the partially halogenated diene polymer is a solution synthesized polymer.

16. The tire of claim 11 , wherein the halogenated diene polymer is present in an amount of about 50 phr to about 100 phr.

17. The tire of claim 11 , wherein the halogenated diene polymer is cis-1,4 polybutadiene having a cis content of about 80% to about 99.9%.

18. A method of making a composition for a tire component, comprising:
mixing:
a partially halogenated solution synthesized diene rubber, including n repeat units of one or more of the following formulae:

wherein X is a halogen, each R is independently selected from H or a C 1 to C 20 alkyl group; and
no more than about 50% of the n repeat units are in blocks of three or more consecutive units;
a reinforcing filler; and
a curing agent.

19. The method of claim 18 , wherein the partially halogenated solution synthesized diene rubber is halogenated with a phosphorus-based halogenating agent.

20. The method of claim 18 , wherein the partially halogenated solution synthesized diene rubber is halogenated with a phosphorus-based halogenating agent.

Assignees

• Bridgestone Corp

Inventors

• Randall Amy M
• Chen Yaohong
• Hergenrother William L
• Agarwal Sheel P

Classifications

• C08C19/12 Primary

  Incorporating halogen atoms into the molecule · CPC title

• C08C19/14

  by reaction with halogens · CPC title

• C08F236/08

  Isoprene · CPC title

• C08K3/36 Primary

  Silica · CPC title

• B60C2200/10

  for motorcycles, scooters or the like · CPC title