JPS54157153A - Acrylonitrile polymer composition - Google Patents

Abstract

PURPOSE: An acrylonitrile polymer composition having improved flame retardancy and mechanical properties, comprising a bromine-containing acrylonitrile polymer, a chlorine-containing polymer, and a specific AB-type block copolymer.

CONSTITUTION: A composition with a chlorine content ≥ 5 wt.% comprising (A) 40W80 wt.% of an acrylonitrile polymer consisting of 60 wt.% of acrylonitrile, 3W 20 wt.% of vinyl bromide, and 0W20 wt.% of one or two or more types of other monomers, (B) 60W20 wt.% of a polymer with a chlorine content ≥ 20 wt.%, and (C) 0.5W10 wt.% of an AB-type block copolymer obtained by copolymerizing (a) a monomer selected from (meth) acrylates, vinyl chloride, and vinylidene chloride and (b) acrylonitrile in the presence of a redox catalyst consisting of an alkyl (un)substituted dicycloperoxide having one or more hydroperoxy groups and a compound which accelerates the decomposition of the hydroperoxy groups but not the ketone peroxy group.

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