Patent ID: 7501223

Claim:
A polymer at least comprising repeating units represented by the following general formulae (1) and (2), and the polymer having a mass average molecular weight of 1,000 to 500,000, wherein R 1 and R 2 independently represent a hydrogen atom or a methyl group; R 3 represents any one of a hydroxy group, a linear or branched alkyl group, a halogen atom, and a trifluoromethyl group; R 4 represents a hydrogen atom or a C 1-10 linear, branched or cyclic alkyl group; Z represents a C 7-30 aliphatic polycyclic alkyl group; t is a positive integer of from 1 to 5; u is 0 or a positive integer of from 1 to 4; and p and q are positive numbers.