Patent ID: 7863359

Claim:
A method of preparing a transparent copolymer resin comprising: (a) mixing 10 to 20 wt % of a styrene monomer, 50 to 60 wt % of an acrylate monomer, 3 to 15 wt % of an acrylonitrile monomer, and 20 to 30 wt % of a reaction medium to prepare a reactant mixture; (b) adding to the reactant mixture 0.01 to 0.1 parts by weight of an organic peroxide initiator, 0.01 to 1 part by weight of a hindered phenol antioxidant and a phosphite antioxidant, and 0.01 to 1 part by weight of a chain transfer agent based on 100 parts by weight of the reactant mixture to prepare a polymerization mixture; and (c) performing continuous bulk polymerization at a temperature range of 120 to 140Â° C. for 2 to 4 hours and then at a temperature range of 130 to 150Â° C. for 2 to 4 hours while introducing the polymerization mixture into a reactor.