Patent ID: 6022915
Filing Date: 2000-02-08
Classification: C08K

Abstract:
A method for reducing the formation of residual monomers on thermal stress and shearing of molding compositions containing as essential componentsA) 98-99.995% by weight, based on A+B, of at least one acrylonitrile-containing polymer, andB) 0.005-2% by weight, based on A+B, of .alpha.-tocopherol with or withoutC) conventional additives in effective amounts, which does not contain light-shielding components and amines,which method comprises adding 0.005-2% by weight, based on A+B, of .alpha.-tocopherol before, during or after the polymerization of the acrylonitrile-containing polymers and before the thermal stress and shearing of the molding compositions, and thereafter subjecting the molding compositions to thermal stress and shearing.