Continuous process for removing unstable components from...

Details Continuous process for removing unstable components from... Continuous process for removing unstable components from...

C - Chemistry, Metallurgy

08

G

402/121

C08G 2/28 (2006.01)

Patent

CA 1307871

HOE 87/F 037 ABSTRACT OF THE DISCLOSURE Continuous process for removing unstable components from crude oxymethylene copolymer, which still contains cata- lysts, monomeric starting materials and unstable compo- nents, 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 least one pressure zone. By this process, degradation is avoided and significantly better properties are contained.

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