Thermoplastic resin composition

Abstract

A thermoplastic resin composition, comprising: (A) 20-95% by weight of a methacrylimide group-containing resin polymer containing at least 5% by weight of an imide ring structural unit expressed by the structural formula (I) ##STR1## (wherein R 1 is a hydrogen atom or a substituted or non-substituted alkyl group having 1-20 carbon atoms, cycloalkyl group, aryl group, alkaryl group or an aralkyl group or allyl group); (B) 2.5-30% by weight of at least one thermoplastic elastomer selected from the group consisting of polyether esters, polyether ester amides and polyether amides; and (C) 2.5-50% by weight of a graft-copolymer obtained by graft-polymerizing at least one monomer selected from the group consisting of vinyl cyanate monomer, aromatic vinyl monomer and acrylic vinyl monomer to a butadiene rubber, is disclosed. This composition has balanced properties in heat resistance, impact strength and moldability.

What we claim: 
     
       1. A thermoplastic resin composition, comprising: (A) 20-95% by weight of a methacrylimide group-containing polymer containing at least 5% by weight of an imide ring structural unit expressed by the structural formula (I) ##STR3##  (wherein R 1  is a hydrogen atom or a substituted or non-substituted alkyl group having 1-20 carbon atoms, cycloalkyl group, aryl group, alkaryl group or an aralkyl group or allyl group);   (B) 5-30% by weight of at least one thermoplastic elastomer selected from the group consisting of polyether esters, polyether ester amides and polyether amides; and   (C) 2.5-50% by weight of a graft-copolymer obtained by graft-polymerizing at least one monomer selected from the group consisting of vinyl cyanate monomer, aromatic vinyl monomer and acrylic monomer to a butadiene rubber.   
     
     
       2. A thermoplastic resin composition as claimed in claim 1 wherein the thermoplastic elastomer of the component (B) is a block-copolymer of polyether ester, polyether ester amide or polyether amide. 
     
     
       3. A thermoplastic resin composition as claimed in claim 1 wherein the thermoplastic elastomer of the component (B) is polyetheylene terephthalate-polytetramethylene oxide block-copolymer. 
     
     
       4. A thermoplastic resin composition as claimed in claim 1 wherein the graft-copolymer of the component (C) is acrylonitrile-butadiene-styrene copolymer. 
     
     
       5. A thermoplastic resin composition as claimed in claim 1 wherein the graft-copolymer of the component (C) is methyl methacrylate-butadiene-styrene copolymer.