Process for the production of oxymethylene copolymer molding com

Details Process for the production of oxymethylene copolymer molding com Process for the production of oxymethylene copolymer molding com

1979-09-11

1980-09-30

Phynes, Lucille M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Treating polymer containing material or treating a solid...

260 459P, 260 4595R, 525398, 525410, 528230, 528492, 528495, C08G 228

Patent

active

042257034

ABSTRACT:
Oxymethylene copolymers molding compositions with low portions of residual formaldehyde are produced by heating the polymerizate melts treated with chemical stabilizers in an apparatus in which there are continuously presented new polymerizate surfaces under reduced pressure. The heating of the polymerizate melt takes place in a thin layer evaporator for highly viscous media during an average residence time of 30 to 120 seconds at an average rate of shear between 500 and 2000 s.sup.-1 and at a pressure P.sub.abs of at most 150 mbar. The escaping gases and vapors are drawn off countercurrent to the polymerizate melt.

REFERENCES:
patent: 3960984 (1976-06-01), Kohan
patent: 4139575 (1979-02-01), Amann et al.

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