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

Patent metadata

Field	Value
Publication number	US-10662298-B2
Application number	US-201816213496-A
Country	US
Kind code	B2
Filing date	Dec 7, 2018
Priority date	Dec 27, 2013
Publication date	May 26, 2020
Grant date	May 26, 2020

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 a diene-based elastomer, a filler, and a mercapto-functional siloxane to form a masterbatch,
where the mercapto-functional siloxane is poly(dimethylsiloxane-co-mercaptopropylmethylsiloxane),
where the diene-based elastomer is selected from the group consisting of natural rubber, synthetic polyisoprene, polybutadiene, polyisobutylene-co-isoprene, neoprene, poly(ethylene-co-propylene), poly(styrene-co-butadiene), poly(styrene-co-isoprene), poly(styrene-co-isoprene-co-butadiene), poly(isoprene-co-butadiene), poly(ethylene-co-propylene-co-diene), and mixtures thereof;

(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 filler includes silica.

3. 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.

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

5. A vulcanizable composition comprising:
(a) a diene-based elastomer selected from the group consisting of natural rubber, synthetic polyisoprene, polybutadiene, polyisobutylene-co-isoprene, neoprene, poly(ethylene-co-propylene), poly(styrene-co-butadiene), poly(styrene-co-isoprene), poly(styrene-co-isoprene-co-butadiene), poly(isoprene-co-butadiene), poly(ethylene-co-propylene-co-diene), and mixtures thereof;
(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 poly(dimethylsiloxane-co-mercaptopropylmethylsiloxane);
(c) from about 5 to about 200 parts by weight of a filler; and
(d) a curative for the elastomer.

6. The vulcanizable composition of claim 5 , where the mercapto-functional siloxane is a distinct molecular species within the vulcanizable composition.

7. The vulcanizable composition of claim 5 , where the mercapto-functional siloxane is covalently bonded at least one of said elastomer.

8. The vulcanizable composition of claim 5 , where the filler includes silica.

9. A vulcanizable composition comprising:
(a) a diene-based elastomer selected from the group consisting of natural rubber, synthetic polyisoprene, polybutadiene, polyisobutylene-co-isoprene, neoprene, poly(ethylene-co-propylene), poly(styrene-co-butadiene), poly(styrene-co-isoprene), poly(styrene-co-isoprene-co-butadiene), poly(isoprene-co-butadiene), poly(ethylene- co -propylene-co -diene), and mixtures thereof;
(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.

10. The vulcanizable composition of claim 9 , where the filler includes silica.

Assignees

• Bridgestone Corp

Inventors

• Kayashima Kentaro
• Hogan Terrence E

Classifications

• C08K3/36

  Silica · CPC title

• C08J2407/00

  Characterised by the use of natural rubber · CPC title

• C08K3/013

  Fillers, pigments or reinforcing additives · CPC title

• C08K3/011

  Crosslinking or vulcanising agents, e.g. accelerators · CPC title

• C08J2351/04

  grafted on to rubbers · CPC title