Preparation and Photosensitivity of Dicinnamyl Maleate

Abstract

To obtain a crosslinking agent with high reactivity toward ultraviola ray, dicinnamyl male ate monomer and oligomers have been prepared by the reaction of maleic anhydride with cinnamyl alcohol. Their photosensitivities were examined. Radical polymerizability of clicinnamyl maleate monomer in solution was poor, and average molecular weight of the obtained oligomers was 1000∼1500. Photochemical reaction of dicinnamyl maleate in methanol brought about dimerization of cinnamyl group, and bulk polymerization brought about products: with lactone rings. Addition of a radical polymerization initiator or a triplet sensitizer to dicina myl maleate improved its photosensitivity, but scarcely increased its spectral sensitivity distribution. The photosensitivity of pentaerythrytol triacryiate, one of the typical photocrosslinking agent, was improved by the addition of dicinnamyl maleate. A joining power of dicinnamyl maleate increased but its adhesiveness decreased with UV-irradiation. Upon heating, selective adherence for various toners occurred; it was useful for joining and hardening material to make a portrait.