Patent ID: 8283102

Claim:
A photoacid generator represented as wherein R 1 is a C 1 -C 5 alkoxy group, R 2 and R 3 are respectively a linear or branched C 1 -C 20 alkyl group, an aryl group, a linear or branched C 1 -C 20 perfluoroalkyl group, a benzyl group, or a C 6 -C 20 aryl group, and A − is a compound represented as wherein X 1 is a monocyclic or polycyclic C 3 -C 20 hydrocarbon group, a benzyl group, a C 6 -C 20 aryl group, a C 1 -C 10 alkyl group, a C 1 -C 10 alkoxy group, a C 1 -C 10 hydroxy alkyl group, or a cyano group, at least one hydrogen atom of the monocyclic or polycyclic C 3 -C 20 hydrocarbon group is or is not substituted with an ether group, an ester group, a carbonyl group, an acetal group, a nitrile group, a cyano group, a hydroxy group, a carboxyl group, or an aldehyde group, R is a C 1 -C 10 alkyl group, a C 1 -C 10 alkoxy group, a nitrogen atom, a sulfur atom, or an oxygen atom, and m is a positive integer of 0 to 2.