Patent ID: 7402634

Claim:
A perfluorocyclobutane ring-containing copolymer which is obtained by copolymerization of at least two of the following prepolymers (a) T -(P) n -T, (b) T 1 -(P 1 ) n -T 1 and (c) T 2 -(P 2 ) n -T 2 wherein n is independently 1 to about 100,000 and T, T 1 and T 2 are independently of the general formula wherein L is an optional linking group and is independently a straight or branched C 1 -C 30 alkyl group, a C 3 -C 30 cycloalkyl group, a C 5 -C 30 aryl group, an ether group, a C 1 -C 20 ester group, an amide group, a siloxanyl, an arylsiloxanyl or a fluorosiloxanyl, R 1 independently represents one or more inertly substituted groups; and each X is independently a group which links the inertly substituted groups and the trifluorovinyl group and is selected from the group consisting of a bond, an oxygen atom, a sulfur atom, a carboxylic ester group, a thiocarboxylic ester group, an amide group, a sulfone, a sulfoxide, a carbonate, a carbamate, a perfluoroalkylene, a perfluoroalkylene ether, an alkylene, an acetylene, a phosphine, a carbonyl group, a thiocarbonyl group, seleno, telluro, nitrido, a silanediyl group, a trisilanediyl group, a tetrasilanetetrayl group, a siloxanediyl group, a disiloxanediyl group, a trisiloxyldiyl group, a trisilazanyl group, a silythio group, a boranediyl group and combinations thereof; P is independently an oxyalkylene radical of the general formula wherein R 2 and R 3 are independently hydrogen, a straight or branched C 1 -C 6 alkyl group, a C 3 -C 30 cycloalkyl group, a C 5 -C 30 aryl group, a straight or branched C 1 -C 6 fluoroalkyl group, a C 3 -C 30 fluorocycloalkyl group, a C 5 -C 30 fluoroaryl group, an ether group, a C 1 -C 20 ester group, an amide group, an amine group, fluorine, a vinyl group, or a hydroxyl group and m is 1 to about 10; P 1 is a polysiloxane radical of the general formula wherein R 4 and R 5 are independently hydrogen, a straight or branched C 1 -C 6 alkyl group, a C 3 -C 30 cycloalkyl group, a C 5 -C 30 aryl group, a straight or branched C 1 -C 6 fluoroalkyl group, a C 3 -C 30 fluorocycloalkyl group, a C 5 -C 30 fluoroaryl group, an ether group, a C 1 -C 20 ester group, C 1 -C 6 alkoxy group, an amide group an amine group, fluorine, a vinyl group, or a hydroxyl group; and P 2 is a perfluorocyclobutane radical of the general formula wherein R 6 independently represents one or more inertly substituted groups and X′ is independently a bond, an oxygen atom, a sulfur atom, a carboxylic or thiocarboxylic ester group, a sulfone, a sulfoxide, perfluoroalkylene, perfluoroalkylene ether, alkylene, acetylene, a phosphine, a carbonyl or thiocarbonyl group; seleno; telluro; nitrido; a silanediyl group, a trisilanedjyl group, a tetrasilanetetrayl group, a siloxanediyl group, a disiloxanediyl group, a trisiloxyl group, a trisilazanyl group, a silythio group, or a boranediyl group.