Patent ID: 7771914

Claim:
A resist composition which is a chemically amplified positive resist composition, comprising 100 parts by weight of a base resin comprising at least recurring units having acid labile groups and recurring units having hydroxyl groups and/or adhesive groups of lactone ring, and 0.1 to 50 parts by weight the polymer comprising recurring units of formula (1): wherein R 1 , R 4 , R 7 , and R 14 are each independently hydrogen or methyl, R 2 , R 3 , R 15 , and R 16 are each independently hydrogen or a straight, branched or cyclic C 1 -C 20 alkyl or fluoroalkyl group, or R 2 and R 3 , and R 15 and R 16 may bond together to form a ring with the carbon atom to which they are attached, and in this case, R 2 and R 3 , and R 15 and R 16 , taken together, stand for a straight, branched or cyclic C 2 -C 20 alkylene or fluoroalkylene group, R is fluorine or hydrogen, or may bond with R 5 to form a ring of 3 to 10 carbon atoms in total with the carbon atom to which they are attached, R 5 is a straight, branched or cyclic C 1 -C 6 alkylene group in which at least one hydrogen atom may be substituted by a fluorine atom, R 6 is a straight or branched C 1 -C 10 alkyl group in which at least one hydrogen atom is substituted by a fluorine atom, R 5 and R 6 may bond together to form a ring with the carbon atoms to which they are attached, and in this case, R 5 and R 6 , taken together, stand for a trivalent organic group of 2 to 12 carbon atoms in total in which at least one hydrogen atom is substituted by a fluorine atom, R 8 is a single bond or a C 1 -C 4 alkylene group, R 10 and R 11 are each independently hydrogen, fluorine, methyl or trifluoromethyl, R 12 and R 13 are each independently a single bond, —O— or —CR 18 R 19 —, R 9 , R 18 , and R 19 are hydrogen, fluorine, methyl or trifluoromethyl, R 17 is a straight or branched C 1 -C 4 alkylene group or may bond with R 15 or R 16 to form a C 3 -C 10 aliphatic ring with the carbon atom to which they are attached, X 1 , X 2 and X 3 are each independently —C(═O)—O—, —O—, or —C(═O)—R 20 —C(═O)—O— wherein R 20 is a straight, branched or cyclic C 1 -C 10 alkylene group, the subscripts are numbers in the range: 0≦(a-1)<1, 0≦(a-2)<1, 0≦(a-3)<1, 0<(a-1)+(a-2)+(a-3)<1, 0<b<1, and 0<(a-1)+(a-2)+(a-3)+b≦1.