METHOD FOR PRODUCING ACRYLIC RESIN FOR USE IN TOP COATING FOR CARS HAVING EXCELLENT PIGMENT DISPERSIBILITY, CLEARNESS, HEAT RESISTANCE, CHEMICAL RESISTANCE AND WEATHER RESISTANCE, ACRYLIC RESIN OBTAINED THEREFROM AND TOP COATING FOR CARS BASED ON THE SAME RESIN

摘要

PURPOSE: Provided is a method for producing an acrylic resin for use in top coating for cars having balanced structural and formal changeability, molecular weight and crosslinking rate of the resin and showing excellent pigment dispersibility, clearness, chemical resistance, heat resistance and weather resistance. CONSTITUTION: The method comprises carrying out solution polymerization of: (a) a compound represented by the following formula 1; (b) a compound represented by the formula of R-C=CH2 (wherein R is an aromatic vinyl compound); and (c) a monomer mixture including at least one long-chain hydroxy-containing monomer selected from a functional monomer obtained by epoxy ring-opening of glycidyl ester with an active hydrogen compound and a monomer obtained by epoxy ring-opening of glycidyl ester with a mercaptan acid or polyester monomer, a hydroxy monomer, and a monomer having an acid or amino group, in the weight ratio of (a):(b):(c) of 50-85:5-20:10-30. In formula 1, R1 is H or CH3, and R2 is a C1-C14 alkyl.