IRRADIATION CURABLE, HIGH SOLID COATING COMPOSITIONS AND THEIR PREPARATION

摘要

Low viscosity copolymer binder, containing hydroxyl groups, obtainable by copolymerization in the absence of solvents or in the presence of small amounts of inert organic solvent, of at least: 1) an adduct of (A) one or more diglycidylesters of alpha , alpha , alpha ', alpha '- branched aliphatic dicarboxylic acids, containing from 8 to 18 carbon atoms in the acid residue and preferably from 10 to 14 carbon atoms (DTADGE) and, (B) acrylic acid, optionally alpha -alkyl-substituted, wherein the alkyl substituent contains from 1 to 4 carbon atoms and preferably 1, the molar ratio of A and B being in the range of from 0.9 to 1.1 to 1.1 to 0.9 and preferably close to 1.0, or an adduct of (C) one or more alpha , alpha , alpha , alpha ', alpha '-branched aliphatic dicarboxylic acids (DTA), and (D) glycidyl acrylate, wherein the acryl acid residue has optionally been substituted by an alkyl from 1 to 4 carbon atoms, and preferably 1 carbon atom, the molar ratio of (C) and (D) being in the range of from 0.9 to 1.1., and preferably close to 1.0, and optionally (2) one ore more ethylenically unsaturated comonomers other than component 1, in the presence of a free radical polymerization photo-initiator (3), and under irradiation with UV and optionally IR light; and irradiation curable coating compositions, comprising said components 1 and 3 and optionally component 2; and cured coating films on a substrate.