US 2007/0167574 A1 · Fluorocarbon rubber with enhanced low temperature properties

Abstract

Processable rubber compositions containing a vulcanized elastomeric material dispersed in a matrix of a thermoplastic polymeric material. The vulcanized elastomeric material is a peroxide cure polymeric material containing repeating units derived from fluorine-containing monomers and at least one peroxide cure site monomer. In one embodiment the matrix forms a continuous phase and the vulcanized elastomeric material is in the form of particles forming a non-continuous phase. The compositions are made by combining a radical curing system, a fluorocarbon elastomer material, and a fluoroplastic material, and heating the mixture at a temperature and for a time sufficient to effect vulcanization of the elastomeric material, while mechanical energy is applied to mix the mixture during the heating step. Shaped articles may be readily formed from the rubber compositions according to conventional thermoplastic processes such as blow molding, injection molding, and extrusion. Examples of useful articles include seals, gaskets, O-rings, and hoses.

Claims38

Dependent claims

A processable rubber composition comprising a vulcanized elastomeric material dispersed in a matrix:

wherein the vulcanized elastomeric material comprises a peroxide cured fluorocarbon elastomer comprising repeating units derived from (a) at least one fluorine-containing olefinic monomer, and (b) from at least one cure site monomer comprising at least one of a C—Cl bond, a C—Br bond, a C—I bond, and an olefin;
and wherein the matrix comprises a thermoplastic polymeric material.

A shaped article prepared by thermoplastic processing of a processable rubber composition comprising a cured fluorocarbon elastomer dispersed in a continuous thermoplastic matrix, wherein the cured fluorocarbon elastomer is cured by a radical curing system and comprises interpolymerized units derived from

(i) tetrafluoroethylene;
(ii) vinylidene fluoride;
(iii) at least one ethylenically unsaturated monomer of the formula
CF2═CF—CFRf,
wherein Rf is perfluoroalkyl of 1 to 8 carbon atoms;
(iv) a cure site monomer comprising at least one functional group selected from the group consisting of a C—Cl bond, a C—Br bond, a C—I bond, and an olefin.

3 more elements

Dependencies are inferred from the claim text.

Fluorocarbon rubber with enhanced low temperature properties

Life of this patent

Fluorocarbon rubber with enhanced low temperature properties

Life of this patent

Abstract

Claims38