Patent ID: 7608381

Claim:
A polymer compound comprising: a constituent unit (a1) represented by the following general formula (1): wherein R represents a hydrogen atom, a fluorine atom, a lower alkyl group having 20 or less carbon atoms, or a fluorinated lower alkyl group having 20 or less carbon atoms, R 1 represents at most 20-membered cyclic group which may have a substituent, and n represents 0 or an integer of 1 to 5, a constituent unit (a2) derived from an (α-alkyl of 1 to 5 carbon atoms) acrylate ester having a lactone-containing monocycle or a polycyclic group, and a constituent unit (a3) which is a constituent unit other than the constituent unit (a1) and the constituent unit (a2) and is derived from an (α-alkyl of 1 to 5 carbon atoms) acrylate ester which has an aliphatic cyclic group-containing non-acid dissociable dissolution inhibiting group and does not have a polar group, wherein the constituent unit (a2) is a constituent unit represented by the following general formula (5): wherein R′ represents an alkyl group of 1 to 5 carbon atoms or a hydrogen atom, and R 2 and R 3 each independently represents a hydrogen atom or an alkyl group of 1 to 5 carbon atoms.