Patent ID: 6030749
Filing Date: 2000-02-29
Classification: G03F,Y10S

Abstract:
A photosensitive element structure for producing a relief printing plate, comprising a substrate film having, disposed thereon in the following order, a photosensitive layer, a protective polymer layer and a cover sheet,said photosensitive layer being comprised of a photosensitive resin composition comprising:(A) at least one polymer selected from the group consisting of a binder polymer having no polymerizable double bond in a molecule thereof, a prepolymer having a polymerizable double bond in a molecule thereof and a mixture thereof;(B) an ethylenically unsaturated compound;(C) a radical producer capable of producing a free radical upon being irradiated with an ultraviolet ray having a wavelength in the range of from 300 to 400 nm; and(D) from 0.005 to 0.2% by weight, based on the weight of the photosensitive resin composition, of an anthraquinone dye capable of exhibiting a color change to produce a fresh color that is stably maintained upon being irradiated with an ultraviolet ray having a wavelength in the range of from 300 to 400 nm in the presence of said radical producer (C), andsaid protective polymer layer being soluble or dispersible in a solvent capable of dissolving or dispersing the photosensitive resin composition of the photosensitive layer; wherein said dye (D) comprises a compound of formula (III): ##STR7## or a derivative of a compound of formula (III) having a benzene ring thereof substituted by a C.sub.1-4 alkyl group.