Vulcanizates and tire components prepared from compositions including mercapto-functional siloxanes

Patent metadata

Field	Value
Publication number	US-10150845-B2
Application number	US-201415108022-A
Country	US
Kind code	B2
Filing date	Dec 29, 2014
Priority date	Dec 27, 2013
Publication date	Dec 11, 2018
Grant date	Dec 11, 2018

Abstract

A vulcanizate prepared by a method comprising introducing an elastomer, a filler, and a mercapto-functional siloxane to form a masterbatch and introducing a curative to the masterbatch to form a vulcanizable composition.

First claim

What is claimed is:

1. A vulcanizate prepared by a method comprising:
a. introducing an elastomer, a filler, and a mercapto-functional siloxane to form a masterbatch; and
b. introducing a curative to the masterbatch to form a vulcanizable composition;

where the mercapto-functional siloxane includes at least one of each of the following repeat units:

where R1, R2, and R3 are each independently a monovalent organic group and each R4 is a divalent organic group; or
where the mercapto-functional siloxane is defined by the formula:

where R 1 ,R 2 , R 3 are each independently a hydrocarbyl group, each R 4 is a divalent organic group, and m and n are integers and the ratio of m to (m+n) is from about 0.03 to about 0.08.

2. The vulcanizate of claim 1 , where the elastomer is a diene-based elastomer.

3. The vulcanizate of claim 1 , where the filler includes silica.

4. The vulcanizate of claim 1 , where said step of introducing introduces from about 5 to about 200 parts by weight filler per one hundred parts by weight elastomer and from about 0.5 to about 20 parts by weight mercapto-functional siloxane per one hundred parts by weight elastomer.

5. The vulcanizate of claim 1 , where the vulcanizate is a tire tread.

6. A vulcanizable composition comprising:
a. an elastomer;
b. from about 0.5 to about 20 parts by weight of a mercapto-functional siloxane per one hundred parts by weight elastomer;
c. from about 5 to about 200 parts by weight of a filler; and
d. a curative for the elastomer;

where the mercapto-functional siloxane includes at least one of each of the following repeat units:

where R1, R2, and R3 are each independently a monovalent organic group and each R4 is a divalent organic group; or
where the mercapto-functional siloxane is defined by the formula:

where R 1 , R 2 , and R 3 are each independently a hydrocarbyl group, each R 4 is a divalent organic group, and m and n are integers and the ratio of m to (m+n) is from about 0.03 to about 0.08.

7. The vulcanizable composition of claim 6 , where the mercapto-functional siloxane is a distinct molecular species within the vulcanizable composition.

8. The vulcanizable composition of claim 6 , where the mercapto-functional siloxane is covalently bonded at least one of said elastomer.

9. The vulcanizable composition of claim 6 , where the elastomer is a diene-based elastomer.

10. The vulcanizable composition of claim 6 , where the filler includes silica.

11. The use of the vulcanizable composition of claim 6 in the preparation of a tire tread.

12. The vulcanizable composition of claim 6 , further comprising a graft copolymer prepared by reacting the mercapto-functional siloxane with the elastomer, where the elastomer is diene-based elastomer.

13. The vulcanizable composition of claim 12 , where the graft copolymer is prepared by:
a. introducing the diene-based elastomer and the mercapto-functional siloxane to form a mixture; and
b. subjecting the mixture to conditions that will react the mercapto-functional siloxane to the diene-based elastomer.

14. The vulcanizable composition of claim 12 , where the filler includes silica.

15. A method for preparing a tire, the method comprising:
a. introducing an elastomer, a filler, and a mercapto-functional siloxane to form a masterbatch;
b. introducing a curative to the masterbatch to form a vulcanizable composition;
c. forming the vulcanizable composition into a green tire tread;
d. building a green tire by using the green tire tread as the tire tread component of the green tire; and
e. subjecting the green tire to curing conditions to form a tire;

where the mercapto-functional siloxane includes at least one of each of the following repeat units:

where R1, R2, and R3 are each independently a monovalent organic group and each R4 is a divalent organic group; or
where the mercapto-functional siloxane is defined by the formula:

where R 1 , R 3 , R 3 are each independently a hydrocarbyl organic group, each R 4 is a divalent organic group, and m and n are integers and the ratio of m to (m+n) is from about 0.03 to about 0.08.

Assignees

• Bridgestone Corp

Inventors

• Kayashima Kentaro
• Hogan Terrence E

Classifications

• C08L21/00

  Compositions of unspecified rubbers · CPC title

• C08L9/06 Primary

  Copolymers with styrene · CPC title

• C08K3/013

  Fillers, pigments or reinforcing additives · CPC title

• B60C1/0016

  Compositions of the tread · CPC title

• C08L83/04

  Polysiloxanes · CPC title