Photoinitiators monomolecular based on borates and their uses as initiators of polymerization of unsaturated compounds has ethylenically

摘要

The invention relates to photopolymerizable compositions comprising as photoinitiator a borate of the formula I or I'R1, R2 and R3 are, for example and independently of one another, phenyl or another aromatic hydrocarbon, with or without any heteroatoms, which radicals are unsubstituted or are substituted, or the radicals R1 and R2 form bridges to produce structures of the formula II, IIa or IIb with the provisos that not more than two of the radicals R1, R2 and R3 are identical and either at least two of the radicals R1, R2 and R3 are aromatic hydrocarbon radicals or phenyl radicals which are substituted in both ortho-positions or at least one radical R1, R2 or R3 is a sterically bulky aryl radical and the remaining radicals of R1, R2 and R3 are aromatic hydrocarbon radicals or are phenyl radicals which are substituted in at least one ortho-position; R4 is, for example, phenyl or C1-C20alkyl and G is a radical which is able to form positive ions.