EP0378373A2 — Photohardenable compositions and their use in producing images

USPTO Abstract

A photohardenable composition comprises an addition polymerizable or crosslinkable material, a photoinitiator composition capable of initiating polymerization or crosslinking of the polymerizable or crosslinkable material, and a compound of the formula <CHEM> Q represents -C=O or -C-OH, X represents S, O or N which is unsbustituted or substituted with alkyl or aryl groups, R1 represents H, alkyl, aryl, alkoxy, benzoyl, arloxy, acyl or monosubstituted amino groups. R2 represents H, alkyl or aryl groups. The composition is preferably contained in microcapsules and is used in photosensitive imaging systems. The five member aromatic group containing the imine moiety functions to reduce the likelihood of short time scale reciprocity failure of the composition and to enable imaging using high intensity radiation sources. An imaging method using the composition is also disclosed.