Methods of imaging photopolymerizable materials containing diester polyether

A method of producing a polymeric image comprising:

• (a) applying to a substrate a layer having a dry weight of 10-70 mg/dm.sup.2 of a photopolymerizable composition comprising:
• (1) 10-79 percent by weight based on the total photopolymerizable layer of at least one ethylenically unsaturated diester polyhydroxy polyether of the formula ##STR6## wherein R is H or CH.sub.3 ;
• R.sup.4 is H or an alkyl of 1-4 carbon atoms;
• n is 1-15;
• p is 0 or 1;
• and when p is 1, R.sup.5 is H or CH.sub.3, and R.sup.6 is H, CH.sub.3 or C.sub.2 H.sub.5 ;
• (2) 1-10 percent by weight, based on the total photopolymerizable layer, of an organic, radiation-sensitive, free-radical generating system comprising at least one 2,4,5-triarylimidazolyl dimer and at least one p-aminophenyl ketone;
• and
• (3) 20-80 percent by weight, based on the total photopolymerizable layer, of a macromolecular, organic, polymeric binder;
• (b) imagewise exposing a portion of the photopolymerizable layer to actinic radiation whereby the ethylenically unsaturated diester compound is polymerized in the radiation-struck areas;
• and
• (c) developing the resulting image.