PIPERAZINE-BASED SENSITISERS

摘要

Compounds of formula (I) {where: R<1> is methyl, ethyl, cycloalkyl or optionally substituted aryl; Z is arylene or a group of formula -(CHR<4>)n-, where R<4> is hydrogen, hydroxy or alkyl, and n is a number from 0 to 6; Y is carbonyl or a -CH2- group; Q is a residue of a mono- or poly- hydroxy compound having from I to 6 hydroxy groups; and x is a number from I to 6; and esters thereof} are useful as sensitisers for use in radiation­curable compositions.