THERMOSENSITIVE RECORDING ELEMENT WITH POLYMERIC TOP COAT

摘要

A thermographic element containing: (a) a substrate; (b) an image-forming layer coated onto the substrate; and (c) overlaying the image-forming layer, a topcoat layer composed of the reaction product of (1) a polymer composed of interpolymerised units derived from: (i) about 45-65 wt.% of vinyl-substituted aromatic monomer; (ii) about 15-30 wt.% vinyl monomer containing a pendant nitrile group; (iii) about 5-30 wt.% hydroxyl-containing ethylenically-unsaturated monomer; and (2) a suitable cross-linking agent. A slip agent is optionally used. The topcoast layer provides a thermographic element with high gloss in the imaged areas; has excellent runnability with no chatter in the feed direction of the element; and exhibits no removal of topcoat which prevents formation of printhead-created voids in the imaged areas.