A polymerizable composition comprising a polymerization initiator (A) represented
by the formula (1) and a radical-polymerizable compound (B):
##STR1##
(wherein R5, R6, R7, R8 and
R9 are each independently a hydrogen atom, an alkyl, alkoxyl, hydroxyl
or acyloxy group, a halogen atom, or NR10R11, but
at least one of them is NR10R11; wherein R1,
R2, R3, R4, R10 and R11 are
each independently a hydrogen atom, or an alkyl or aryl group; and Z- is
an arbitrary anion).
