Additive for the reduction of mottle in photothermographic and thermographic elements.

摘要

Photothermographic element has a substrate carrying a compsn. contg. (a) a photosensitive Ag halide; (b) a non-photosensitive reducible source of silver; (c) a reducing agent for the silver source (b); (d) a binder; and (e) a fluorinated polymer. The fluorinated polymer contains at least three different gps. within the polymer derived from the following reactive monomers (i) to (iii) : (i) a fluorinated, ethylenically unsatd. monomer, (ii) a hydroxyl-contg. ethylenically unsatd. monomer, and (iii) a polar, ethylenically unsatd. monomer. The thermographic element is the same as the above element except that the compsn. only contains components (b) to (e) and omits the photosensitive Ag halide (a). Also claimed is a thermographic element.