Compositions containing: (a) 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; the ratio of the number of equivalents of epoxy groups to that of photopolymerizable groups being 1:0.01 to 1:0.7, are suitable as impregnating resins.
1. Composition containing
(a) 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,
the ratio of the number of equivalents of epoxy groups to that of photopolymerizable groups being 1:0.01 to 1:0.07 and wherein the composition contains 0.25–0.75 aminehydrogen equivalent of the component (b) per epoxide equivalent of the epoxy resin (a).
2. Composition according to claim 1 , containing a bisphenol diglycidyl ether or an epoxy novolak as component (a).
3. Composition according to claim 1 , containing bisphenol A diglycidyl ether or an epoxycresol novolak as component (a).
4. Composition according to claim 1 , containing a primary monoamine as component (b).
5. Composition according to claim 1 , containing benzylamine, n-octylamine, 2-phenylethylamine, 3-(2-ethylhexyloxy)propylamine or 2-(2-aminoethoxy)ethanol as component (b).
6. Composition according to claim 1 , containing diaminodiphenylsulphone, dicyandiamide, phenylimidazole and 2,4,6-tris(dimethylaminomethyl)phenol as component (c).
7. Composition according to claim 1 , containing an acrylic acid ester or a methacrylic acid ester as component (d).
8. Composition according to claim 1 , containing ethylene glycol dimethacrylate, 1,4-butanediol dimethacrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, 2-ethoxyethyl methacrylate, 1,1,1-trimethylolpropane trimethacrylate, pentaerythritol tetraacrylate or dipentaerythritol pentacrylate as component (d).
9. Composition according to claim 1 , containing isopropylthioxanthone or 2-methyl-1-[4-(methylthio) phenyl]-2-morpholinopropan-1-one as component (e).