Abstract: An alkali development type photocurable composition comprises (A) an alkali-soluble macromolecular binder having a weight-average molecular weight in the range of 5,000 to 100,000 and an acid value in the range of 50 to 150 mg KOH/g and obtained by causing (d) a compound possessing one glycidyl group in its molecule to react with a carboxyl group of (A-1) a copolymer of (a) an ethylenically unsaturated bond-containing compound possessing one carboxyl group in its molecule with (b) an ethylenically unsaturated bond-containing compound possessing neither hydroxyl group nor acidic group in its molecule, or a carboxyl group of (A-2) a copolymer of the compounds (a) and (b) mentioned above and (c) an ethylenically unsaturated bond-containing compound possessing a hydroxyl group and then causing (e) a polybasic acid anhydride to react with a hydroxyl group caused by the above reaction, (B) an inorganic powder, (C) a photopolymerizable monomer, (D) a photopolymerization initiator, and (E) an organic solvent.

Abstract: An alkali development type photocurable composition comprises (A) an alkali-soluble macromolecular binder having a weight-average molecular weight in the range of 5,000 to 100,000 and an acid value in the range of 50 to 150 mg KOH/g and obtained by causing (d) a compound possessing one glycidyl group in its molecule to react with a carboxyl group of (A-1) a copolymer of (a) an ethylenically unsaturated bond-containing compound possessing one carboxyl group in its molecule with (b) an ethylenically unsaturated bond-containing compound possessing neither hydroxyl group nor acidic group in its molecule, or a carboxyl group of (A-2) a copolymer of the compounds (a) and (b) mentioned above and (c) an ethylenically unsaturated bond-containing compound possessing a hydroxyl group and then causing (e) a polybasic acid anhydride to react with a hydroxyl group caused by the above reaction, (B) an inorganic powder, (C) a photopolymerizable monomer, (D) a photopolymerization initiator, and (E) an organic solvent.

Abstract: A photocurable and thermosetting coating composition which can be diluted with water is disclosed. This composition comprises a photopolymerizable resin having a number-average molecular weight in the range of from 500 to 50,000 and containing an aprotic ammonium salt-containing moiety in a proportion of from 0.2 to 4.0 mols per kilogram of the resin, a photopolymerization initiator, a thermosetting component, and a diluent. The photopolymerizable resin is obtained by the reaction of a polymer possessing a tertiary amino group with a monocarboxylic acid and a monoepoxy compound either or both thereof possessing a polymerizable unsaturated double bond. As the thermosetting component, at least one member selected from the group consisting of amino resins, cyclocarbonate compounds, blocked isocyanate compounds, and epoxy resins is used. A tack-free coating film is obtained by applying this composition to a printed circuit board and drying the applied layer of the composition.

Abstract: Disclosed are an organic acid salt of melamine represented by the following general formula (1) and a thermosetting and a photocurable and thermosetting coating compositions containing the salt mentioned above. ##STR1## wherein Z represents ##STR2## wherein R.sup.1 represents a hydrogen atom or an alkyl group, alkylene group, alicyclic hydrocarbon, or aromatic hydrocarbon severally having from 1 to 18 carbon atoms, or any of said groups or hydrocarbons whose hydrogen atom is substituted by carboxyl group, hydroxyl group, or a halogen atom, R.sup.2 represents a hydrogen atom or an alkyl group or alkylene group severally having from 1 to 9 carbon atoms, or any of said groups whose hydrogen atom is substituted by acryloyl group or methacryloyl group, R.sup.3 represents an alkyl group or alkylene group severally having from 1 to 9 carbon atoms, or any of said groups whose hydrogen atom is substituted by acryloyl group or methacryloyl group, and R.sup.

Abstract: Disclosed are an organic acid salt of melamine represented by the following general formula (1) and a thermosetting and a photocurable and thermosetting coating compositions containing the salt mentioned above. ##STR1## wherein Z represents ##STR2## wherein R.sup.1 represents a hydrogen atom or an alkyl group, alkylene group, alicyclic hydrocarbon, or aromatic hydrocarbon severally having from 1 to 18 carbon atoms, or any of said groups or hydrocarbons whose hydrogen atom is substituted by carboxyl group, hydroxyl group, or a halogen atom, R.sup.2 represents a hydrogen atom or an alkyl group or alkylene group severally having from 1 to 9 carbon atoms, or any of said groups whose hydrogen atom is substituted by acryloyl group or methacryloyl group, R.sup.3 represents an alkyl group or alkylene group severally having from 1 to 9 carbon atoms, or any of said groups whose hydrogen atom is substituted by acryloyl group or methacryloyl group, and R.sup.