Piperazine-based sensitisers

摘要

Compounds of formula (I) where: {R¹ is methyl, ethyl, cycloalkyl or optionally substituted aryl; Z is arylene or a group of formula -(CHR⁴)n-, where R⁴ 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-hydroxyl compound having from I to 6 hydroxy groups; and x is a number from I to 6; and esters thereof} are useful as sensitizers for use in radiationcurable compositions.