Photopolymerisable components of radiation sensitive compositions
AssigneeDuPont (U.K.) Limited
InventorsJohn Robert Wade, Michael John Pratt, Jianrong Ren
Life of this patent
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Abstract
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.
Claims8
A process for producing a polyunsaturated compound which comprises (a) forming a mono isocyanate compound having the formula ##STR9## by reacting a compound YOH with a polyisocyanate OCN--Z--(NCO).sub.n where n is 1 or 2;
- Z represents the residue of a polyisocyanate OCN--Z--(NCO).sub.n, and Y is the residue of a monohydroxyl compound of the formula YOH where Y contains at least two ethylenically unsaturated double bonds in a reaction medium in which said compound YOH and said polyisocyanate are miscible and said mono isocyanate compound is immiscible;
- (b) recovering said mono isocyanate compound from said reaction medium, and reacting a compound of the formula .COPYRGT.-(XH).sub.r with said mono isocyanate compound wherein .COPYRGT. represents the residue of an active hydrogen containing compound of the formula .COPYRGT.-(XH).sub.r where XH is a hydroxyl group, a mercapto group or a primary or secondary amino group;
- and r is an integer ranging from 1 to 10 for a simple molecule and from 1 to 10,000 for a polymeric macromolecule.
A polyunsaturated compound having the general formula:
- ##STR14## where .COPYRGT. represents the residue of an active hydrogen containing compound of the formula .COPYRGT.-(XH).sub.r where XH is a hydroxyl group, a mercapto group or a primary or secondary amino group;
- and r is an integer ranging from 1 to 10 for a simple molecule and from 1 to 10,000 for a polymeric macromolecule, Z represents the residue of a polyisocyanate OCN--Z--(NCO).sub.n, where n is 1 or 2;
- ##STR15## is provided by a pure polyethylenically unsaturated monoisocyanate of the formula ##STR16## and Y is the residue of a monohydroxy compound of formula YOH where Y contains at least two ethylenically unsaturated double bonds, with the proviso that said active hydrogen containing compound is an organic colorant or a chromophore functioning as a shading dye or colour-change dye, an anti-halation reagent, a photosensitizer, an organic azide photoactive material, a photoinitiator, a polymeric binder resin, or an isocyanate blocking agent.
Dependencies are inferred from the claim text.