Patent ID: 8241831

Claim:
An acid generating agent represented by the following formula (1): wherein X represents an unsubstituted or substituted non-cyclic alkyl group having 1 to 20 carbon atoms and selected from alkyl, haloalkyl and alkylsulfonyl, which may have at least one hydrogen atom substituted by an ether group, an ester group, a carbonyl group, an acetal group, a nitrile group, a cyano group, a hydroxyl group, a carboxyl group or an aldehyde group, or represents a perfluoroalkyl group having 1 to 4 carbon atoms; R 6 represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, or a heteroatom selected from nitrogen (N), sulfur (S), fluorine (F) and oxygen (O); m is an integer from 0 to 2; and A+ is an organic counterion.