Composition for UV-curable cationic electrodeposition coating with good scratch resistance and coating film thereof

摘要

PPROBLEM TO BE SOLVED: To provide a composition for a UV curable type cationic electrodeposition paint having satisfactory liquid stability with passage of time, high sensitivity and satisfactory scratch resistance, surface curing properties and adhesiveness. PSOLUTION: The composition for the UV curable type cationic electrodeposition paint includes: 50 to 80 pts.wt. water soluble or water dispersion vinyl copolymer (A) having an unsaturated group at an end part of a part of a main chain and obtained by copolymerizing the following components (a) to (c): (a) 4 to 15 pts.wt. copolymerizable vinyl monomer having a tertiary amino alkyl group as a substituent, (b) 85 to 96 pts.wt. copolymerizable vinyl monomer other than (a), (c) 0.05 to 20 pts.wt. addition cleavage type chain transfer agent based on 100 pts.wt. sum total copolymerizable vinyl monomers (a) and (b); 20 to 50 pts.wt. compound (B) having three or more unsaturated groups in one molecule; 0.1 to 8 pts.wt. photopolymerization initiator (C) based on 100 pts.wt. sum total (A) and (B), having 0.02g solubility to 100 g water containing 3% alcoholic solvent at 25C and 10,000 L/molcm molar extinction coefficient of maximum absorption in 200 to 400 nm; and 0.01 to 5 pts.wt. resin modified poly dimethyl siloxane (D) based on 100 pts.wt. sum total (A) and (B). PCOPYRIGHT: (C)2010,JPO&INPIT