Patent ID: 7785768

Claim:
A thermal acid generator for formation of an antireflective film represented by the following formula (1), wherein R 1 represents an alkyl group, an alkenyl group, an oxo-alkyl group or an oxo-alkenyl group, in which a hydrogen atom is substituted with a fluorine atom; R 2 represents an alkyl group, an alkenyl group, an oxo-alkyl or oxo-alkenyl group, or an aralkyl or aryloxo-alkyl group; R 3 represents a hydrogen atom or an alkyl group; x represents an integer of 0 to 2; y represents an integer of 1 to 5; two R 2 s may be the same or different from each other and may form a ring when x is 2; R 2 represents an alkylene group having 1 to 12 carbons when the ring is formed; and Y − represents a non-nucleophilic opposed ion represented by the following formula (c-2), (R 202 SO 2 ) 2 N − (c-2) wherein R 202 represents an alkyl group in which a hydrogen atom may be substituted with a fluorine atom; or an aryl group, which may have a substituent, and two R 202 s may be the same or different from each other, or may combine to form a ring.