Patent ID: 8043788

Claim:
A resist composition comprising a polymer which changes its alkali solubility under the action of an acid as a base resin, a copolymer comprising recurring units containing an amino group and recurring units containing at least one fluorine atom as an additive, wherein said copolymer has the general formula (1): in which R 1 , R 4 , and R 7 are each independently hydrogen or methyl, X 1 and Y 2 are each independently selected from the group consisting of a single bond, —O—R 9 —, —C(═O)—O—R 9 —, —C(═O)—NH—R 9 —, a straight or branched C 1 -C 4 alkylene, and phenylene group, wherein R 9 is a straight, branched or cyclic C 1 -C 10 alkylene group which may contain an ester or ether group, n is 1 or 2, in case of n=1, Y 1 is selected from the group consisting of a single bond, —O—R 9 —, —C(═O)—O—R 9 —, —C(═O)—NH—R 9 —, a straight or branched C 1 -C 4 alkylene, and phenylene group, wherein R 9 is as defined above, in case of n=2, Y 1 is selected from the group consisting of —O—R 101 ═, —C(═O)—O—R 101 ═, —C(═O)—NH—R 101 ═, a straight or branched C 1 -C 4 alkylene group with one hydrogen atom eliminated, and a phenylene group with one hydrogen atom eliminated, wherein R 101 is a straight, branched or cyclic C 1 -C 10 alkylene group with one hydrogen atom eliminated which may contain an ester or ether group, R 2 and R 3 are each independently selected from the group consisting of hydrogen, a straight, branched or cyclic C 1 -C 10 alkyl group, a C 2 -C 20 alkenyl group, and a C 6 -C 10 aryl group, R 2 and R 3 may bond together to form a ring of 3 to 20 carbon atoms with the nitrogen atom to which they are attached, the alkyl group, alkenyl group, aryl group or the ring may contain a hydroxy, ether, ester, cyano, amino group, double bond or halogen atom, or R 2 and X 1 may bond together to form a ring of 3 to 20 carbon atoms with the nitrogen atom to which they are attached, R 5 is a straight, branched or cyclic C 1 -C 12 alkylene group, R 6 is hydrogen, fluorine, methyl, trifluoromethyl or difluoromethyl, or R 5 and R 6 may bond together to form an aliphatic ring of 2 to 12 carbon atoms with the carbon atom to which they are attached, which ring may contain an ether group, fluorinated alkylene group or trifluoromethyl group, R 8 is a straight, branched or cyclic C 1 -C 10 alkyl group which has at least one fluorine atom substituted thereon and which may contain an ether, ester or sulfonamide group, the subscripts are numbers in the range: 0<a<1.0, 0≦(b-1)<1.0, 0≦(b-2)<1.0, 0<(b-1)+(b-2)<1.0, and 0.5≦a+(b-1)+(b-2)≦1.0, and a compound capable of generating an acid in response to actinic light or radiation.