Continuous process for removing unstable components from crude oxymethylene copolymer

Abstract From the Canadian patent

Continuous process for removing unstable components from crude oxymethylene copolymer, which still contains catalysts, monomeric starting materials and unstable components, by treating the copolymer with deactivators op-, tionally in the presence of auxiliaries in a pressure, zone, and subsequently removing volatile components in a pressure-release zone in the presence or absence of stabilizers, in which process the crude polymer is fully melted in the absence of the deactivators and auxiliaries immediately after completion of the polymerization step and the deactivators are subsequently incorporated alone, or together with auxiliaries, under pressure into the resultant polymer melt in at …