| 摘要 |
Compounds of the formula (I) and (II) in which R1, R2 and R3 are, for example, unsubstituted or substituted phenyl, where none of the radicals R1-R3 is a phenyl radical which is substituted ortho to the bond to the borate atom; R1', R2', R3' have one of the meanings of R1-R3; R4 and R5 are OH or OR6 or have one of the meanings of R1-R3 and the radicals R1', R2', R3', R4 and R5 can also be substituted ortho to the bond to the borate atom; R6 is, for example, unusbstituted or C1-C12alkoxy- or halo-substituted C1-C12alkyl; X is, for example, C1-C20alkylene which is unsubstituted or substituted or which is interrupted by one or more aromatic hydrocarbons, or X is, for example, C3-C12cycloalkylene or polycycloalkylene; and Z<+> is a radical which is able to form positive ions; are suitable as coinitiators for the photopolymerization of ethylenically unsaturated compounds.
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