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

Patent metadata

Field	Value
Publication number	US-2019106546-A1
Application number	US-201816213496-A
Country	US
Kind code	A1
Filing date	Dec 7, 2018
Priority date	Dec 27, 2013
Publication date	Apr 11, 2019
Grant date	—

Abstract

A vulcanizate prepared by a method including introducing an elastomer, a filler, and a mercapto-functional siloxane to form a masterbatch, where the mercapto-functional siloxane is selected from the group consisting of poly(dimethylsiloxane-co-mercaptopropylmethylsiloxane) and dimethoxy mercapto propyl terminated siloxanes, introducing a curative to the masterbatch to form a vulcanizable composition, and subjecting the vulcanizable composition to curing conditions.

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, where the mercapto-functional siloxane is selected from the group consisting of poly(dimethylsiloxane-co-mercaptopropylmethylsiloxane) and dimethoxy mercapto propyl terminated siloxanes; b. introducing a curative to the masterbatch to form a vulcanizable composition; and c. subjecting the vulcanizable composition to curing conditions.

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 any 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, where the mercapto-functional siloxane is selected from poly(dimethylsiloxane-co-mercaptopropylmethylsiloxane) and dimethoxy mercapto propyl terminated siloxanes; c. from about 5 to about 200 parts by weight of a filler; and d. a curative for the elastomer.

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 . 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, where the mercapto-functional siloxane consists of the following repeat units:

where R 1 , R 2 , and R 3 are each independently a monovalent organic group and each R 4 is a divalent organic group;

c. from about 5 to about 200 parts by weight of a filler; and
d. a curative for the elastomer.

12 . The vulcanizable composition of claim 11 , where the elastomer is a diene-based elastomer.

13 . The vulcanizable composition of claim 11 , where the filler includes silica.

Assignees

• Bridgestone Corp

Inventors

• Kayashima Kentaro
• Hogan Terrence E

Classifications

• B60C1/0016

  Compositions of the tread · CPC title

• C08K5/548

  containing sulfur {(C08K5/5477 takes precedence)} · CPC title

• C08L7/00

  Compositions of natural rubber · CPC title

• C08L2205/035

  containing four or more polymers in a blend · CPC title

• C08J2309/06

  Copolymers with styrene · CPC title