Patent ID: 8431323

Claim:
A polymer comprising recurring units of the general formula (6) and having a weight average molecular weight of 1,000 to 500,000, wherein R 1 is hydrogen, methyl or trifluoromethyl, and Y is a structure having the general formula (Y-1), (Y-2) or (Y-3), in formula (Y-1), R 2a , R 2b , R 3a , and R 3b are each independently a single bond, hydrogen, hydroxyl, halogen, or a straight, branched or cyclic monovalent C 1 -C 15 organic group, or any two of R 2a , R 2b , R 3a , and R 3b may bond together to form a ring with the carbon atom to which they are attached, the structure (Y-1) is linked to the —(C═O)—O— linkage in recurring unit (6) via any one of R 2a , R 2b , R 3a , and R 3b , in formula (Y-2), R 5a , R 5b , R 6a , R 6b , R 7a , and R 7b are each independently a single bond, hydrogen, hydroxyl, halogen, or a straight, branched or cyclic monovalent C 1 -C 15 organic group, or any two of R 5a , R 5b , R 6a , R 6b , R 7a , and R 7b may bond together to form a ring with the carbon atom to which they are attached, the structure (Y-2) is linked to the —(C═O)—O— linkage in recurring unit (6) via any one of R 5a , R 5b , R 6a , R 6b , R 7a , and R 7b , in formula (Y-3), R 8a , R 8b , R 9a , and R 9b are each independently a single bond, hydrogen, hydroxyl, halogen, or a straight, branched or cyclic monovalent C 1 -C 15 organic group, or any two of R 8a , R 8b , R 9a , and R 9b may bond together to form a ring with the carbon atom to which they are attached, the structure (Y-3) is linked to the —(C═O)—O— linkage in recurring unit (6) via any one of R 8a , R 8b , R 9a , and R 9b , and R 10 is a straight, branched or cyclic C 1 -C 19 alkyl group in which at least one hydrogen atom may be substituted by a halogen atom or at least one methylene moiety may be substituted by an oxygen atom or carbonyl group, with the proviso that when the structure (Y-1), (Y-2) or (Y-3) is linked to the —(C═O)—O—linkage in recurring unit (6) via a linking group which is any one of R 2a , R 2b , R 3a , R 3b , R 5a , R 5b , R 6a , R 6b , R 7a , R 7b , R 8a , R 8b , R 9a , and R 9b , the linking group is an organic group as defined above, but having a valence bond as a result of one hydrogen atom being eliminated therefrom.