Patent ID: 8785563

Claim:
A method for producing a cross-linkable fluoroelastomer, which comprises heat-treating a mixture of a fluoroelastomer (A), an organic peroxide (B) and at least one additive (C) selected from the group consisting of a C 12-28 higher fatty acid, a metal salt of a C 12-28 higher fatty acid, an ester of a C 12-28 higher fatty acid, and an amide of a C 12-28 higher fatty acid and a C 12-28 higher aliphatic alcohol, at a temperature of from 110 to 380° C. to produce said cross-linkable fluoroelastomer, wherein the cross-linkable fluoroelastomer has an absorption peak at from 1640 to 1700 cm −1 , wherein the peak intensity of the absorption at from 1640 to 1700 cm −1 of the infrared absorption spectrum as represented by absorbance of a hot pressed sample having a thickness of 0.2 mm is from 0.05 to 1.5, and wherein the fluoroelastomer (A) has no absorption peak at from 1640 to 1700 cm −1 .