Patent ID: 7169869

Claim:
A polymer comprising recurring units of the general formula (1-1) or (1-2) and having a weight average molecular weight of 1,000 to 500,000, wherein R 1 to R 3 each are hydrogen, fluorine or a straight, branched or cyclic alkyl or fluorinated alkyl group of 1 to 40 carbon atoms, R 4 is a single bond or a straight, branched or cyclic alkylene or fluorinated alkylene group of 1 to 40 carbon atoms, R 5 is a single bond or a straight, branched or cyclic alkylene or fluorinated alkylene group of 1 to 40 carbon atoms, R 6 is a single bond or a straight, branched or cyclic alkylene or fluorinated alkylene group of 1 to 40 carbon atoms, R 7 is hydrogen or an acid labile group, R 8 is a straight, branched or cyclic fluorinated alkyl group of 1 to 40 carbon atoms, the subscript a is 1 or 2, b is an integer of 0 to 4, and c is an integer of 1 to 4, satisfying 1≦a+b+c≦4.