Aqueous developable photopolymerizable elements

Claim 1

An aqueous developable photopolymerizable element comprising a support bearing at least one layer of a photopolymerizable composition consisting essentially of (a) at least one nongaseous ethylenically unsaturated compound capable of forming a high polymer by free-radical initiated chain propagating addition polymerization; (b) at least one organic acid polymeric binder soluble in solely aqueous alkaline solvent devoid of organic solvents; (c) an organic, radiation-sensitive, free-radical generating photoinitiator or photoinitiator system taken from the class consisting of polynuclear quinones, vicinal ketaldonyl alcohols, acyloin ethers, alpha-hydrocarbon-substituted aromatic acyloins, photoreducible dyes and reducing agents including dyes of the phenazine, oxazine and quinone classes, Michler's ketone, benzophenone, 2,4,5-triphenyl-imidazolyl dimers with hydrogen donors, and mixtures, and (d) at least 4.0% by weight based on the weight of solids in the photopolymerizable composition of an organic compound or salt of an organic compound taken from the group consisting of (1) ##STR16## wherein R is an alkyl chain with 7 to 17 carbon atoms (2) ##STR17## wherein R is CH 3 (CH 2 ) 7 CH═CH(CH 2 ) 8 --, or a mixture of alkyl chains with 16 and 18 carbon atoms and CH 3 (CH 2 ) 7 CH═CH(CH 2 ) 8 --, and x+y is 2 to 10; (3) ##STR18## wherein R is a straight or branched alkyl chain of 8 to 13 carbon atoms; (4) ##STR19## wherein R is an alkyl chain with 1 to 9 carbon atoms; (5) ##STR20## wherein n is 10 to 50; (6) ##STR21## (7) C 16 H 33 N(CH 3 ) 3 + Br - ; (8) RNH CH 2 CH 2 COO - Na + wherein R is an alkyl group derived from coconut oil; and combinations thereof.