Patent ID: 8916622

Claim:
Heat-curable composition comprising, from 25 to 65% by weight, relative to the total weight of the composition, of a mixture of epoxy-functional monomers, said mixture consisting of (a) at least one polyfunctional epoxy monomer selected from monomers comprising from 4 to 8, glycidyl groups and/or cycloaliphatic epoxy groups, which represent from 76 to 85% by weight of total epoxy content, (b) at least one tri-functional epoxy monomer selected from monomers comprising three glycidyl groups, which represent the balance of total epoxy content, from 25 to 70% by weight, relative to the total weight of the composition of at least one organic solvent selected from glycol monoethers, from 2.5 to 5% by weight, relative to the total weight of epoxy functional monomers (a) and (b), of at least one strong acid catalyst which is inactive at ambient temperature (20° C.) and catalyzes epoxy ring-opening only when being heated to a temperature of at least 80° C., said heat-curable composition not containing any acrylic, methacrylic or silane monomers.