Method for processing crude polyoxymethylene

Details Method for processing crude polyoxymethylene Method for processing crude polyoxymethylene

1995-03-20

1996-07-30

Acquah, Samuel A.

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

055412840

ABSTRACT:
The subject invention relates to method for processing crude polyoxymethylene in which the isolation of unstable components from crude polyoxymethylene, such as residual monomers which are at least partly in the form of cyclic formaldehyde derivatives, is effected by treatment of the crude polyoxymethylene with an inert gaseous medium. The method of the invention is characterized in that the gaseous medium contains at least 10 volume % of water vapor, and less than 0.1 volume % of a volatile base, and/or less than 1 volume % of a volatile solvent. In an alternative variant method, the gaseous medium contains at least 10 volume % of water vapor and the treatment occurs at a temperature between 114.degree. C and the softening temperature of the crude polyoxymethylene and at a pressure of less 1.2 .multidot.10.sup.5 Pa.

REFERENCES:
patent: 3027352 (1962-03-01), Walling et al.
patent: 3803094 (1974-04-01), Ishii et al.
patent: 5144005 (1992-09-01), Sextro et al.

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