Light-sensitive transfer sheet for use in printing - using 4,6-bis(tri:halo:methyl)-s-triazin-2-yl photopolymerisation initiator to prevent yellowing in non-image regions

摘要

A light-sensitive transfer sheet comprises a carrier, a release contg. an organic polymer and photopholymerisation initiator-contg. light-sensitive resin layer is that this initiator contains a light-sensitive 5-triazine cpd. of formula (I) T = 4,6-bis(trihalomethyl)-5-triazin-2-yl gp.; R1 and R2 = H or opt. substd. alkyl or aryl or together with the N atom form a heterocyclic ring; and R3 and R4 = H, halogen, alkyl or alkoxy. USE/ADVANTAGE - The non-image regions of the release layer show little or no yellowing in a multistage, multicolour printing process.