Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Treating polymer containing material or treating a solid...
Patent
1988-02-04
1992-09-01
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Treating polymer containing material or treating a solid...
528481, 528487, 528488, 528489, 528491, 528492, 528495, 528499, 528501, 525417, 525472, C08G 210, C08G 228
Patent
active
051440059
ABSTRACT:
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, optionally 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 obtained.
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Burg Karlheinz
Fischer Eberhard
Muck Karl-Friedrich
Sextro Gunter
Hoechst Aktiengesellschaft
Kight III John
Sergent Rabon
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