Patent ID: 7488785

Claim:
Process for the preparation of prepregs, characterized in that a reinforcing material is impregnated with a composition containing (a) liquid epoxy resin, (b) an aliphatic or cycloaliphatic primary monoamine and/or an aliphatic or cycloaliphatic disecondary diamine, (c) a latent curing agent for the epoxy resin (a) which does not react until temperatures above 70° C. (measured by means of DSC at a heating rate of 10° C./min), (d) a photopolymerizable compound and (e) a photoinitiator; wherein the ratio of the number of equivalents of epoxy groups to photopolymerizable groups is from 1:0.01 to 1:0.7, and the ratio of amine hydrogen equivalents of component (b) to epoxide equivalents of epoxy resin (a) is from 0.25:1 to 0.75:1 and exposed to actinic radiation until the material solidifies by photopolymerization of the photopolymerizable compound (d) to give a substantially solid layer.