| abstract |
A polymerization initiator composition which, even when brought into contact with paper or the like in air, neither scorches nor ignites it and which imparts high polymerizability to a polymerizable composition to enable it to cure in a short time; and an adhesive composition containing the polymerization initiator composition. The polymerization initiator composition comprises 100 parts by weight of an organoboron compound (A) such as a trialkylboron, alkoxyalkylboron, dialkylborane, monocyclo- or bicyclocompound having a boron atom as a heteroatom, or partially oxidized trialkylboron, 5 to 40 parts by weight of an aprotic solvent (B) having a boiling point of 50 to 120°C, and 0.2 to 5 parts by weight of an alcohol (C) having a boiling point of 60 to 180°C. |