Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Treating polymer containing material or treating a solid...
Reexamination Certificate
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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Heinemann Johannes
Schwittay Claudius
Stammer Achim
Stockelmann Elmar
Zollner Knut
BASF - Aktiengesellschaft
Connolly Bove & Lodge & Hutz LLP
Fang Shane
Gulakowski Randy
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