Patent ID: 6773855
Filing Date: 2004-08-10
Classification: G03F,H05K

Abstract:
An alkali-developable, photocurable and thermosetting solder resist composition, comprising: (A) a high purity synthetic silica powder having a uranium content of not more than 1.0 ppb, (B) a photosensitive prepolymer containing a carboxylic group and at least two ethylenically unsaturated groups in its molecule and having an acid value of solid content of 50 to 150 mg KOH/g, (C) a photosensitive (meth)acrylate compound, (D) a photopolymerization initiator, (E) an epoxy resin, and (F) a curing catalyst,wherein said high purity synthetic silica powder has an average particle diameter of not more than 10.0 &mgr;m and is present in an amount of 5 to 40 parts by weight, based on 100 parts by weight of the composition, and said photosensitive prepolymer (B) is at least one compound selected from the group consisting of: (1) a photosensitive prepolymer obtained by the reaction of (a) a polyfunctional epoxy compound having at least two epoxy groups in its molecule with (b) an unsaturated monocarboxylic acid and the subsequent reaction of (c) a saturated or unsaturated polybasic acid anhydride with a hydroxyl group caused by said reaction, (2-1) a photosensitive prepolymer obtained by the reaction of (a) a polyfunctional epoxy compound having at least two epoxy groups in its molecule with (b) an unsaturated monocarboxylic acid and (d-1) a compound having one reactive group other than an alcoholic hydroxyl group capable of reacting with an epoxy group in its molecule, and the subsequent reaction of (c) a saturated or unsaturated polybasic acid anhydride with a product of said reaction, and (2-2) a photosensitive prepolymer obtained by the reaction of (a) a polyfunctional epoxy compound having at least two epoxy groups in its molecule with (b) an unsaturated monocarboxylic acid and (d-2) a compound having at least one alcoholic hydroxyl group and one reactive group other than an alcoholic hydroxyl group capable of reacting with an epoxy group in its molecule, and the subsequent reaction of (c) a saturated or unsaturated polybasic acid anhydride with a product of said reaction.