Dupont (uk) Limited

Du Pont-howson Limited

Jianrong Ren

John R Wade

Michael John Pratt

Rodney M Potts

Terence Etherington

Victor Kolodziejczyk

Colorants, polymeric binder resins, photoinitiators, photosensitizers, color-change agents, anti-halation agents, stabilizers, and other active hydrogen-containing components of radiation sensitive compositions for lithographic printing plate production and the like are reacted with a polyethylenically unsaturated monoisocyanate compound of the formula ##STR1## wherein Y is the residue of a monohydroxyl compound of formula YOH and Y contains at least two ethylenically unsaturated double bonds. In this way the components are bonded to the image on exposure.

Photopolymerisable components of radiation sensitive compositions

Polyunsaturated diazonium compounds suitable for use in negative working radiation sensitive compositions are provided. They may be produced by reacting an aromatic diazonium compound of the formula

Process for preparing a polyunsaturated diazonium compounds

Polyunsaturated diazonium compounds

A radiation-sensitive compound, which comprises a polymer including a plurality of azide-substituted aromatic ester groups and a plurality of carboxylic or sulphonic acid groups capable of imparting to the compound solubility in aqueous or alkaline medium. After image-wise exposure, the compound can be developed using an aqueous or alkaline developer. The compound is useful in the production of radiation sensitive plates for the manufacture of lithographic printing plates which can be baked to improve printing life.

Bakeable aqueous photopolymers and their use in printing plates

A polymeric compound is derived from a polyhydric material and has pendant sulphonate groups of the general formula ##STR1## and pendant alkyl urethane groups of the formula ##STR2## where X is an aliphatic, aromatic, carboxylic or heterocyclic group; Y is hydrogen, halogen or an alkyl, aryl, alkoxy, aryloxy or aralkyl group, CO.sub.2.sup.- Z.sup.+, CO.sub.2 R or SO.sub.3.sup.- Z.sup.+ ; Z.sup.+ is a cationic counter ion and R is hydrogen alkyl, alkylene, aryl or aralkyl group.

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Leeds, United Kingdom

Jianrong Ren