Patent ID: 7135270

Claim:
A polymer which increases a dissolution rate in an alkali developer under the action of an acid, the polymer comprising recurring units having the general formulae (1), (2), (3) and (4), the recurring units being of at least one type for each formula, wherein R 1 , R 2 , R 3 and R 6 are each independently hydrogen or methyl, R 4 and R 5 are each independently hydrogen or hydroxyl, X is a tertiary exo-alkyl group having a bicyclo[2.2.1]heptane framework, represented by any of the general formulae (X-1) to (X-4): wherein R 7 is a straight, branched or cyclic alkyl group having 1 to 10 carbon atoms, and a broken line depicts a bonding position and a bonding direction, and Y is a tertiary alkyl group having an adamantane structure.