Plastic and nonmetallic article shaping or treating: processes – Vacuum treatment of work
Patent
1985-11-12
1987-09-08
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Vacuum treatment of work
159 22, 264102, 264143, 264169, 26421123, 264310, 26433122, 264349, 264DIG78, 366 75, 528270, B29B 784
Patent
active
046922903
ABSTRACT:
A process is provided for removing volatile materials from a molten oxymethylene polymer, according to which the molten polymer is passed through a rotating disk polymer processor having at least three stages; a first devolatilization stage, then a stabilization stage and then a second devolatilization stage. The molten polymer in the first devolatilization stage is maintained at a temperature above its melting point in the temperature range of from about 160.degree. C. to about 220.degree. C. and at a vapor space pressure of from about 0.1 to about 300 Torr. The polymer in the stabilization stage is maintained in the molten state at a temperature of from 160.degree. C. to about 220.degree. C. The polymer in the second devolatilization stage is maintained in the molten state at a temperature of from about 160.degree. C. to about 190.degree. C. and at a vapor space pressure of from about 0.1 to about 100 Torr.
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Burns Timothy L.
Christy Ronald S.
Dorsey John W.
Nash George S.
Steele Douglas W.
Celanese Corporation
Sayko Jr. Andrew F.
Thurlow Jeffery
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