Photocurable resin composition containing acrylate silane and epoxy silane and/or their hydrolysis products

A photocurable resin composition consisting essentially of the components (a), (b), (c) and (d) or the components (a), (b) and (e) of the following components:

• (a) at least one polymerisable compound having at least one ethylenically unsaturated group per molecule that is a mixture of a urethane acrylate and a (meth)acrylate wherein the mixture contains no silane groups;
• (b) a photopolymerisation initiator;
• (c) a hydrolysis product of at least one silane group-containing compound of the general formula:
• ##STR5## wherein R.sup.1 represents a hydrogen atom or lower alkyl. group, A represents --O-- or --NH--, R.sup.2 represents a C.sub.1-6 alkylene group, R.sup.3 represents a lower alkyl group, X represents a lower alkoxy group or halogen atom and m represents 0, 1 or 2;
• (d) at least one compound of the general formula:
• ##STR6## wherein R.sup.4 represents a glycidoxy or C.sub.5-6 epoxycycloalkyl group, R.sup.5 represents a C.sub.1-6 alkylene group, R.sup.6 represents a lower alkyl group, Y represents a lower alkoxy group or halogen atom and n represents 0, 1 or 2, or at least one silane group-containing hydrolysis product thereof;
• (e) a silane group-containing hydrolysis product of a mixture of at least one compound of Formula (I) and at least one compound of Formula (II), and wherein said composition, after application to a substrate, is curable to form a coating on the substrate that is characterized by having improved adhesion and heat and humidity resistance.