Abstract: There is provided a curable resin having an unsaturated group and a carboxyl group at the terminals of its side chains, such as a curable resin obtained by reacting an unsaturated group-containing monocarboxylic acid (d) with a reaction product (c) of a compound having three or more phenolic hydroxyl groups in its molecule (a) and an alkylene oxide (b) and further reacting a polybasic acid anhydride (f) with the resultant reaction product (e). By compounding such a curable resin with a photopolymerization initiator, a photosensitive (meth)acrylate compound, an epoxy compound, a diluent solvent, another curable resin which has a carboxyl group and an unsaturated group in its molecule and which is in the state of solid at room temperature, a flame-retardant, etc., there is obtained a photocurable and thermosetting resin composition which is useful for the formation of a solder resist of a printed circuit board, an interlaminar insulating layer of a multi-layer circuit board, or the like.

Abstract: A photosetting liquid ink composition developable with a dilute alkaline aqueous solution and comprising (A) a resin curable with an activated energy ray, obtained by the reaction of a saturated or unsaturated polybasic acid anhydride with a product of the reaction of a novolak type epoxy compound and an unsaturated monocarboxylic acid, (B) a photopolymerization initiator, and (C) a diluent can be used for the production of an etching resist or a solder resist in the manufacture of a printed circuit. This composition, when combined with a thermosetting component, produces a photosetting and thermosetting liquid ink composition.

Abstract: A photosensitive thermosetting resin composition, comprising (A) a photosensitive prepolymer containing at least two ethylenically unsaturated bonds in the molecular unit thereof, (B) a photoinitiator, (C) a photopolymerizable vinyl monomer and/or an organic solvent as a diluent, (D) a finely powdered epoxy compound containing at least two epoxy groups in the molecular unit thereof and exhibiting sparing solubility in the diluent to be used, and optionally (E) a curing agent for epoxy resin, excels in developing property and sensitivity and enjoys a long shelf life.By subjecting this photosensitive thermosetting resin composition to coating, exposure, development, and postcuring, there can be formed a solder resist pattern which excels in adhesion, insulation resistance, resistance to electrolytic corrosion, resistance to soldering temperature, resistance to chemicals, and resistance to plating.