Patent ID: 6376605
Filing Date: 2002-04-23
Classification: C08F,C08L

Abstract:
A styrene resin obtained by continuous bulk or solution polymerization with control of the ratio of unsaturated nitrile monomer/styrene monomer to a predetermined value in the styrene resin, said styrene resin comprising 50 to 90 wt. % of a continuous phase component (S) composed of a copolymer of a styrene monomer and an unsaturated nitrile monomer, or a styrene monomer, an unsaturated nitrile monomer and another monomer copolymerizable therewith; and 10 to 50 wt. % of a dispersed phase component composed of a rubbery polymer component on which said monomers have been graft polymerized and which has occluded said copolymer; wherein from the unsaturated nitrile monomer unit (A) of the continuous phase component (S), no triple chain unit AAA is detected and a double chain unit AA amounts to 3% or less based on the whole units (A) detected, a reduced viscosity (&eegr;sp/c) of the continuous phase component (S) is 0.2 to 0.85 dl/g and the content of a metal component of Group I and/or II of the periodic table in terms of metal is 100 wt.ppm or less in terms of a metal.