Method for removing residual monomers from polyoxymethylenes

Details Method for removing residual monomers from polyoxymethylenes Method for removing residual monomers from polyoxymethylenes

2005-05-17

2009-10-06

Gulakowski, Randy (Department: 1796)

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

Synthetic resins

Treating polymer containing material or treating a solid...

C528S232000

Reexamination Certificate

active

07598339

ABSTRACT:
A process for removing residual monomers from polyoxymethylene homo- or copolymers, comprising the following process steps:a) the residual monomers are removed in gaseous form as vapors from the polymer in a devolatilization apparatus,b) the residual monomer vapors are removed through a vapor pipe,c) the residual monomers are condensed from the vapors in a condensation apparatus at from 1.09 to 102.4 bar and from 102 to 230° C., the temperature not falling below 102° C. at any point of the condensation apparatus, and those surfaces of the condensation apparatus which come into contact with the vapors being coated with a liquid film of condensed residual monomers.

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