Photopolymerization initiator composition and photopolymerizable composition

摘要

A photopolymerization initiator composition comprising (A) a sulfonium organoboron complex or oxosulfonium organoboron complex of the formula (1), <CHEM> and (B) a sensitizer having electron donating capability and electron acceptability in an excited state, and a photopolymerizable composition which further comprises (C) an ethylenically unsaturated compound.