Patent ID: 6933095

Claim:
A polymer comprising recurring units of the following general formulae (1a), (1b) and (1c) and having a weight average molecular weight of 1,000 to 500,000, wherein R 1 , R 2 , R 5 to R 7 and R 10 to R 12 each are hydrogen, a fluorine atom or a straight, branched or cyclic alkyl or fluorinated alkyl group of 1 to 20 carbon atoms, R 3 is a fluorine atom or a straight, branched or cyclic fluorinated alkyl group of 1 to 20 carbon atoms, R 4 and R 8 each are hydrogen or an acid labile group, R 9 and R 14 each are a fluorine atom or a straight, branched or cyclic alkyl or fluorinated alkyl group of 1 to 20 carbon atoms, R 13 is —C(CF 3 ) 2 —O—R 15 , R 15 is hydrogen or an acid labile group, a, b and c are numbers in the range: 0<a<1, 0<b<1, 0<c<1, and 0<a+b+c≦1, d is an integer of 1 to 4, e is the integer 1 or 2, and f is an integer of 0 to 4, and 1≦e+f≦5.