Patent ID: 9250523
Filing Date: 2016-02-02
CPC Classification: G03F

Claim Text:
1. A resist composition comprising a polymer capable of increasing alkali solubility under the action of acid, as a base resin and a copolymer comprising recurring units derived from at least one monomer selected from the group consisting of indene, benzofuran, and benzothiophene, and recurring units having at least one fluorine atom, as a polymeric additive, said copolymer having the general formula (1): wherein R 2 is hydrogen, or C 1 -C 4 straight or branched alkyl, alkoxy, acyloxy, hydroxyl, carboxyl, alkoxycarbonyl, or —OC(═O)R, wherein R is a C 1 -C 6 straight or branched alkyl or fluoroalkyl group, R X n is 1 or 2, in case of n=1, X in case of n=2, X R R R M is a methylene group, oxygen atom or sulfur atom, subscripts p-2, q-1 and q-2 are numbers in the range: 0<(p-2)<1.0, 0≦(q-1)<1.0, 0≦(q-2)<1.0, 0<(q-1)+(q-2)<1.0 and 0.5≦(p-2)+(q-1)+(q-2)≦1.0.