C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/7
C08G 2/28 (2006.01) B01D 19/00 (2006.01)
Patent
CA 1264391
Abstract of the Disclosure A process is provided for removing volatile materials from a molten oxymethylene polymer, according to which the molten poly- mer is passed through a rotating disk polymer processor having at least three stages; a first devolatilization stage, then a stabil- ization stage and then a second devolatilization stage. The molten polymer in the first devolatilization stage is maintained at a tem- perature above its melting point in the temperature range of from about 160°C to about 220°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°C to about 220°C. The polymer in the second devolatilization stage is maintained in the molten state at a temperature of from about 160°C to 190°C and at a vapor space pressure of from about 0.1 to about 100 Torr.
522527
Burns Timothy L.
Christy Ronald S.
Dorsey John W.
Nash George S.
Steele Douglas W.
Celanese Corporation
Smart & Biggar
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