Patent ID: 7354693

Claim:
A polymer comprising recurring units having the general formula (1) and recurring units (d) derived from (meth)acrylates having pendant perfluoroalkyl groups: wherein R 1 and R 2 each are hydrogen or methyl, R 3 is a C 1 -C 12 alkylene group when n=1 or a C 1 -C 12 alkylidyne group when n=2, which has a straight, branched or cyclic structure, R 4 is a C 1 -C 12 alkylene group which has a straight, branched or cyclic structure, R 5 is a C 1 -C 12 alkylene group, subscripts a, b 1 and b 2 are numbers in the range: 0<a<1, 0â‰¦b 1 <1, 0â‰¦b 2 <1, 0<b 1 +b 2 <1, 0<a+b 1 +b 2 â‰¦1.0, and n is equal to 1 or 2, and said recurring units (d) derived from (meth)acrylates having pendant perfluoroalkyl groups being at least one selected from the group consisting of units having the following formulae: