Patent ID: 6444741
Filing Date: 2002-09-03
Classification: C08L

Abstract:
A method of preparing a composition containing a fluorocarbon thermoplastic random copolymer comprising the steps of:(a) providing a mixture having: (i) a fluorocarbon thermoplastic random copolymer having subunits of: â€”(CH2CF2)xâ€”, â€”(CF2CF(CF3)yâ€”, and â€”(CF2CF2)zâ€”, â€ƒwherein x is from 1 to 50 or 60 to 80 mole percent, y is from 10 to 90 mole percent, z is from 10 to 90 mole percent, and x+y+z equal 100 mole percent; (ii) a filler comprising zinc oxide; (iii) a curable amino functional polydimethyl siloxane copolymer comprising aminofunctional units selected from the group consisting of (aminoethylaminopropyl) methyl, (aminopropyl) methyl and (aminopropyl) dimethyl; and (iv) a bisphenol residue curing agent; and (b) curing the mixture for 3 to 10 hours at a temperature in the range of 220Â° C. to 280Â° C. and for an additional 2 to 10 hours a temperature in the range of 250Â° C. to 270Â° C.