Liquid photosensitive resin composition containing carboxylated epoxy acrylates or methacrylates

Claim 1

A liquid photosensitive resin composition consisting essentially of (a) 10 to 55% by weight of an at least partially carboxylated compound selected from the group consisting of at least partially carboxylated multifunctional epoxy acrylates and at least partially carboxylated multifunctional epoxy methacrylates wherein said at least partially carboxylated compound is obtained by the reaction of a dibasic acid or anhydride and the addition product of an acid selected from the group consisting of acrylic acid and methacrylic acid to the epoxy groups of a polyepoxy compound; wherein said partially carboxylated compound has an average acid value of 4 to 150 and a number average molecular weight of not greater than 5,000; (b) 10 to 55% by weight of a cross-linking monomer having at least two monoethylenically unsaturated bonds; (c) 5 to 55% by weight of a vinyl monomer having one monoethylenically unsaturated bond; (d) 4 to 35% by weight of an inorganic filler; and (e) 0.05 to 20% by weight of at least one photopolymerization catalyst selected from the group consisting of photo-initiators and photosensitizers wherein at least one of the cross-linking monomer (b) or at least one of the vinyl monomer (c) satisfy at least one of the following requirements (i) and (ii): (i) at least 50% by weight of said cross-linking monomer (b) consists of a monomer containing ester linkages not associated with (meth)acrylate in the molecule and having a number average molecular weight of 200 to 800 and a number average molecular weight per polymerizable double bond of 200 to 250; (ii) at least 50% by weight of said vinyl monomer (c) consists of a compound of the general formula ##STR7## wherein R 1 is H-- or CH 3 --, B is --OCH 2 CHOHCH 2 -- or --OCH 2 CH 2 -- n in which n is a whole number of 1 to 4, and Ar is ##STR8## in which R 2 is H-- or an alkyl group having not more than 12 carbon atoms.