Thermoplastic resin composition and method for preparing the same

A thermoplastic resin composition prepared by blending

• (I) 50 to 1% by weight based on the weight of components I and II of a polypropylene,
• (II) 50 to 99% by weight based on the weight of components I and II of a polyarylene sulfide,
• (III) 0.1 to 100 parts by weight, based on 100 parts by weight of the aforesaid components (I)+(II), of a compatibilizing agent which is a graft copolymer comprising 5 to 95% by weight of an olefin polymer or copolymer component selected from the group consisting of polypropylene, ethylene-glycidyl methacrylate copolymer and ethylene-ethylacrylate copolymer and 95 to 5% by weight of a vinyl polymer or copolymer component, different from said olefin polymer or copolymer component, obtained by polymerizing at least one vinyl monomer selected from the group consisting of vinyl aromatic monomers, vinyl ester monomers, and (meth)acrylonitrile monomer, one of said components being in the state of a dispersion phase having a particle diameter of 0.001 to 10 .mu.m in the other of said components,
• said graft copolymer prepared by melting a graft polymerization precursor obtained by copolymerizing at least one said vinyl monomer with at least one radical polymerizable organic peroxide represented by the following general formula (a) and (b) ##STR5## wherein R.sub.1 is a hydrogen atom or an alkyl group having 1 or 2 carbon atoms, each of R.sub.2 and R.sub.7 is a hydrogen atom or a methyl group, R.sub.6 is a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, each of R.sub.3, R.sub.4, R.sub.8, and R.sub.9 is an alkyl group having 1 to 4 carbon atoms, each of R.sub.5 and R.sub.10 is an alkyl group having 1 to 12 carbon atoms, a phenyl group, an alkyl-substituted phenyl group or a cycloalkyl group having 3 to 12 carbon atoms, m is 0, 1 or 2, and n is 0, 1 or 2, in particles of said olefin polymer or copolymer selected from the group consisting of polypropylene, acrylate copolymer, and
• (IV) 0 to 150 parts of inorganic filler based on 100 parts by weight of said components (I)+(II)+(III).