Patent ID: 6774182
Filing Date: 2004-08-10
Classification: C08F,C08L

Abstract:
A method for preparing a thermoplastic resin composition, which comprises the steps of:a) preparing a graft ABS polymer by emulsion polymerization of: i) 40 to 70 wt parts conjugated diene rubber latex; ii) 15 to 40 wt parts an aromatic vinyl compound; and iii) 5 to 20 wt parts a vinyl cyanide; b) preparing a copolymer by: i) mixing 55 to 80 wt part alphamethyl styrene, 20 to 45 wt part acrylonitrile, 26 to 30 wt parts a solvent; and 0.1 to 0.5 wt parts a molecular weight controlling agent in a polymerization reactor; and ii) conducting a mass polymerization at 140Ëœ170Â° C. for 2Ëœ4 hours; wherein the copolymer comprises less than 15% alphamethyl styrene-alphamethyl styrene-alphamethyl styrene chain and 45% or less alphamethyl styrene-acrylonitrile-acrylonitrile chain; and c) blending the graft ABS polymer and the copolymer.