Fluoroelastomer compositions that contain a...

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C - Chemistry, Metallurgy

08

L

400/9351

C08L 27/16 (2006.01) H01H 49/00 (2006.01)

Patent

CA 2026246

FLUOROELASTOMER COMPOSITIONS THAT CONTAIN A TETRAALKYLAMMONIUM HALIDE METAL ADHESION PROMOTER AND THE PROCESS FOR PREPARATION THEREOF ABSTRACT OF THE DISCLOSURE A fluoroelastomer composition that has enhanced adhesion to metal when cured which comprises: (a) an elastomeric copolymer of vinylidene fluoride and at least one other fluorinated monomer; (b) a crosslinking agent selected from the group consisting of a bisphenol and a polyhydroxy phenol of the formula Image or Image where R is hydrogen, alkyl or aryl and R' is alkyl or aryl; (c) a crosslinking accelerator which is a quaternary ammonium salt of the formula R"4N+X- wherein each R" is independently an alkyl group of 2-10 carbon atoms or an aryl group of 7-10 carbon atoms and X- is selected from the group consisting of fluoride, dihydrogen phosphate, periodate, acetate, hydrogen sulfate, methane sulfonate, and toluene sulfonate; (d) an acid acceptor which is one or more members of the group consisting of a divalent metal oxide and a divalent metal hydroxide; and (e) 0.02 0.8 parts by weight based on the weight of the elastomeric copolymer of a metal adhesion promoter which is a tetraalkylammonium halide where each alkyl group contains 2-10 carbon atoms and the halide is chloride, bromide or iodide. There is also disclosed a process for the preparation of these fluoroelastomer compositions.

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