US 5,177,148 A · Covulacanizable compositions of fluorelastomers having an improved chemical stability

Abstract

Covulcanizable compositions comprising (A) 55-100% by weight of an elastomeric copolymer of vinylidene fluoride with perfluoropropene optionally tetrafluoroethylene and containing from 0.001 to 2% by weight of bromine; (B) 0-45% by weight of a tetrafluoroethylene and propylene copolymer; (C) 0.7-2.5 parts for 100 parts of mix (A)+(B) of a bisphenol compound; (D) 0.3-1.5 parts for 100 parts of mix (A)+(B) of an organic guaternary compound of ammonium, phosphonium or aminophosphonium; (E) 0.4-5 parts for 100 parts of mix (A)+(B) of an organic peroxide; (F) 1-5% by weight of (A)+(B) of a peroxide cross-linking coagent.

Claims18

Dependent claims

A co-vulcanizable composition of fluoroelastomers comprising:

A) 55-100% by weight of a fluoroelastomer consisting of 40-85% by moles of vinylidene fluoride, 15-35% of perfluoropropene, 0-30% of tetrafluoroethylene, and containing from 0.001 to 2% by weight of bromine;
B) a copolymer consisting of 40-60% by moles of tetrafluoroethylene and 40-60% of propylene in an amount up to 45% by weight;
C) 0.7-2.5 parts per 100 parts of mix (A)+(B) of an organic polyhydroxy compound;
D) 0.3-1.5 parts per 100 parts of mix (A)+(B) of a quaternary ammonium, phosphonium or amino-phosphonium compound;
E) 0.4-5 parts per 100 parts of mix (A)+(B) of an organic peroxide;
and
F) 1-5% by weight per 100 parts of mix (A)+(B) of a peroxide cross-linking coagent.

4 more elements

A co-vulcanizable composition of fluoroelastomers comprising:

A) 55-100% by weight of a fluoroelastomer consisting of 40-85% by moles of vinylidene fluoride, 15-35% of perfluoropropene, 0-30% of tetrafluoroethylene, and containing from 0.001 to 2% by weight of bromine;
B) 0.7-2.5 parts of an organic polyhydroxy compound per 100 parts of (A);
C) 0.3-1.5 parts of a quaternary ammonium, phosphonium or amino-phosphonium compound per 100 parts of (A);
D) 0.4-5 parts of an organic peroxide per 100 parts of (A);
and
E) 1-5% by weight of a peroxide cross-linking coagent per 100 parts of (A).

3 more elements

Dependencies are inferred from the claim text.

Covulacanizable compositions of fluorelastomers having an improved chemical stability

Life of this patent

Covulacanizable compositions of fluorelastomers having an improved chemical stability

Life of this patent

Abstract

Claims18