Heat-curable epoxy functional composition and transparent heat-cured caustic-resistant hard-coatings prepared therefrom

摘要

A heat-curable composition comprises—from 25 to 65% by weight of a mixture of epoxy-functional monomers, said mixture consisting of at least one polyfunctional epoxy monomer selected from monomers comprising from 4 to 8 glycidyl groups and/or cycloaliphatic epoxy groups, and at least one bi- or tri-functional epoxy monomer selected from monomers comprising two or three glycidyl groups and/or cycloaliphatic epoxy groups, —from 25 to 70% by weight of at least one organic solvent selected from glycol monoethers, —from 2.5 to 5% by weight, relative to the total weight of epoxyfunctional monomers (a) and (b), of at least one blocked strong acid catalyst, said heat-curable composition not containing any non-epoxyfunctional monomers, in particular not containing any acrylic, methacrylic or silane monomers.

主权项

1. 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.