Abstract: Disclosed herein is a resin composition or a solder resist resin composition comprising an epoxy resin (A) and/or an epoxy acrylate (B) obtained by reacting one chemical equivalent of epoxy groups in an epoxy resin with 0.1 to 1.0 chemical equivalent of acrylic acid, a styrene-maleic anhydride copolymer (C), an unsaturated group-containing compound (D) other than (B), and a photopolymerization initiator (E).

Abstract: The present invention relates to an unsaturated group-containing polycarboxylic acid resin produced by reacting an epoxidized compound of a condensate of a phenolic compound and an aromatic aldehyde having a phenolic hydroxyl group with (meth)acrylic acid, and further reacting the reaction product with polybasic carboxylic acid or an anhydride thereof; a composition comprising the resin and a cured product of the resin or the composition.The composition according to the present invention is developable with an aqueous alkaline solution and suitable for a solder resist composition which is excellent in heat resistance, solvent resistance, adhesion, electric insulation property and storage stability.

Abstract: Disclosed herein is a photopolymerizable composition comprising poly-N-vinylpyrrolidone (A); a compound (B) represented by the formula (I): ##STR1## wherein each of R.sup.1, R.sup.2 and R.sup.3 represents a hydrogen atom or a methyl group; an acid amide (C) represented by the formula (II): ##STR2## wherein R.sup.4 represents a hydrogen atom or a methyl group and a monomeric compound (D) having an acryloyl group or a methacryloyl group in the molecule thereof as well as optionally a photopolymerization-initiator (E).

Abstract: Disclosed herein are ethylenically unsaturated compounds represented by the formula: ##STR1## wherein R represents a hydrogen atom or a methyl group, on the average m and n respectively represent a value of 1 to 5, on the average p represents a value of 1 to 6, on the average q and r represent respectively a value of 0 to 3, on the average s represents a value of 0 to 5, p+q+r+s is 6: q+r is a value of 0 to 3, p+s is a value of 3 to 6 and the average value of mp+nq is 1 to 30, and a method for producing the same.

Abstract: Acetal glycol diacrylates of the formula: ##STR1## wherein R.sub.1 represents H or CH.sub.3 and R.sub.2 represents CH.sub.3, C.sub.2 H.sub.5 or C.sub.3 H.sub.7,and a process for producing them are provided.

Abstract: Di(meth)acrylate esters of the formula: ##STR1## wherein m and n each represents O or an integer of 1 to 3, the average sum of m+n being 1 to 6 and R represents hydrogen or a methyl group, and process for producing the same.The esters are copolymerizable with other unsaturated compounds to form radiation hardenable films with a reduced irritating effect.