abstract |
Compounds of formula I, wherein n is 1-30 and X, Y, R, Ar 1 and Ar 2 have the meaning given in claim 1 can be prepared by reacting a benzil dialkyl ketal with a diol. Depending on the molar ratio of the two reaction components, products of different degrees of polycondensation n are obtained. The compounds can be used as photoinitiators. |