| 摘要 |
Photoinitiator compounds of formula (I): {where: A represents a direct bond or a group of formula -[O(CHR<SUP>7</SUP>CHR<SUP>6)</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>7</SUP>CHR<SUP>6</SUP>)<SUB>a</SUB>]-, where one of R<SUP>6 </SUP>and R<SUP>7 </SUP>is hydrogen and the other is hydrogen or methyl; a is a number from 1 to 2; b is a number from 4 to 5; Q is a residue of a polyhydroxy compound having 2 to 6 hydroxy groups; x is a number greater than 1 but no greater than the number of available hydroxyl groups in Q; y is a number from 1 to 10; R<SUP>1</SUP>, R<SUP>2</SUP>, R<SUP>3 </SUP>and R<SUP>4 </SUP>are individually the same or different and each is hydrogen, hydroxy, or alkyl; or R<SUP>1 </SUP>and R<SUP>3 </SUP>are joined to form a fused ring system with the benzene rings to which they are attached; and R<SUP>5 </SUP>represents a direct bond, an oxygen atom or a methylene group} are useful as cationic photoinitiators, especially for use in surface coating applications, such as printing inks and varnishes, and which are intended to be cured by polymerisation initiated by radiation.
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