Dynamic vulcanization with fluorocarbon processing aids

A shaped article comprising a thermoplastically processed dynamically vulcanizate, the dynamic vulcanizate comprising the product of dynamic cure of a curable fluorocarbon elastomer, a thermoplastic material, and an uncurable fluorocarbon elastomer, wherein the curable fluorocarbon elastomer cures completely under the dynamic cure conditions and where the uncurable fluorocarbon elastomer is incompletely or not at all cured, and wherein the uncurable elastomer is present at 1 to 10 phr based on 100 parts of the curable fluorocarbon elastomer.

A process for making a thermoprocessable polymer composition comprising:

• dynamically vulcanizing a first fluorocarbon elastomer composition in the presence of a thermoplastic polymeric material and in the further presence of a second fluorocarbon elastomer composition under conditions where the first fluorocarbon elastomer composition is completely cured and the second fluorocarbon elastomer composition is less than fully cured or not at all cured during the dynamic vulcanization, wherein the second fluorocarbon elastomer is present at up to 10 parts based on 100 parts of the first fluorocarbon elastomer composition.

A process for making a thermoprocessable polymer composition comprising:

• forming a mixture comprising a first curable fluorocarbon elastomer curable with peroxide, a peroxide compound, a crosslinking agent, a thermoplastic polymer composition, and a second uncurable fluorocarbon elastomer;
• and
• dynamically curing the first elastomer by applying mechanical and thermal energy to the mixture.