Abstract: A printable dielectric composition comprising finely divided particles of talc and/or mica dispersed in a curable liquid composition containing acrylated rubber modified epoxy resin oligomer, acrylated polydiene oligomer and alkyl acrylate.

Abstract: Discrete, substantially nonswellable crosslinked polymeric beads, 0.7 to 20 .mu.m average diameter wherein at least 90% of the beads by population are below 20 .mu.m, which are nonagglomerating in any solvent or solvents including solvents for the liquid monomer or monomers used in preparation thereof. The polymeric beads are homopolymers of tri- and tetraacrylate and tri- and tetramethacrylate monomers, copolymers thereof, copolymers of one of said acrylate or methacrylate monomers with up to 50% of a monomer having a single terminal ethylenic group or with up to 75% of a monomer having two terminal ethylenic groups or three terminal ethylenic groups different from said triacrylate or trimethacrylate monomers defined above.

Abstract: A photopolymerizable element, preferably a lithographic plate, is provided. This element comprises a substrate bearing a photopolymerizable layer having a weight of about 1 to about 90 mg/dm.sup.2, said layer comprising:(1) at least one ethylenically unsaturated diester polyhydroxy polyether of the formula ##STR1## 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) an organic, radiation-sensitive, free-radical generating system comprising 2,4,5-triarylimidazolyl dimer and p-aminophenyl ketone; and(3) a macromolecular, organic, polymeric binder.A polymeric image is formed by imagewise exposing the layer to actinic radiation and then developing the resulting image such as by removing unexposed portions of the layer with a solvent.

Abstract: A photopolymerizable element, preferably a lithographic plate, is provided. This element comprises a substrate bearing a photopolymerizable layer having a weight of about 1 to about 90 mg/dm.sup.2, said layer comprising:(1) at least one ethylenically unsaturated diester polyhydroxy polyether of the formula ##STR1## 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) an organic, radiation-sensitive, free-radical generating system comprising 2,4,5-triarylimidazolyl dimer and p-aminophenyl ketone; and(3) a macromolecular, organic, polymeric binder.A polymeric image is formed by imagewise exposing the layer to actinic radiation and then developing the resulting image such as by removing unexposed portions of the layer with a solvent.