ACRYLONITRILE POLYMERS STABILIZED AGAINST THERMAL DISCOLORATION BY THE PRESENCE OF DIALKYL PYROCARBONATES

摘要

The Specification describes polymer materials comprising (8) a homopolymer of acrylonitrile or a copolymer of acrylonitrile and at least one further copolymerisable monomer, the copolymer containing at least 20% by weight of units of acrylonitrile; and (b) a dialkyl pyrocarbonate in an amount sufficient to inhibit or prevent thermal discoloration. The antidiscoloration additive can be incorporated into a monomer composition from which the homopolymer or copolymer is formed or can be admixed with the formed polymer.