| 摘要 |
Compounds of formula (I): {where n is a number from 1 to 6; R<SUP>3 </SUP>is hydrogen, methyl or ethyl; A represents a group of formula -[O(CHR<SUP>2</SUP>CHR<SUP>1</SUP>)<SUB>a</SUB>]<SUB>y</SUB>-, -[O(CH<SUB>2</SUB>)<SUB>b</SUB>CO]<SUB>y</SUB>-, or -[O(CH<SUB>2</SUB>)<SUB>b</SUB>CO]<SUB>(y-1)</SUB>-[O(CHR<SUP>2</SUP>CHR<SUP>1</SUP>)<SUB>a</SUB>]- (where one of R<SUP>1 </SUP>and R<SUP>2 </SUP>is hydrogen and the other is hydrogen, methyl or ethyl); a is from 1 to 2; b is from 4 to 5; y is from 3 to 10; Q is a residue of a polyhydroxy compound having 2 to 6 hydroxy groups; and x is greater than 1 but no greater than the number of available hydroxyl groups in Q} and esters thereof are useful as photoinitiators for the preparation of energy-curable compositions, such as varnishes and printing inks.
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