Polymer devolatilisation process

Details Polymer devolatilisation process Polymer devolatilisation process

C - Chemistry, Metallurgy

08

F

C08F 12/08 (2006.01) C08F 6/00 (2006.01) C08F 6/28 (2006.01) C08F 112/08 (2006.01) C08F 212/08 (2006.01) C08F 279/02 (2006.01) C09K 3/00 (2006.01)

Patent

CA 2299601

A process for the removal of impurities from a thermoplastic polymer, comprising mixing with the polymer in a molten state a stripping agent comprising a solution of carbon dioxide in water, passing the mixture to a vessel held at a pressure and which is less than atmospheric pressure, allowing impurities to defuse out of the polymer into the volatilised stripping agent, and removing the volatilised stripping agent with the impurities from the mixture. The invention also relates to the stripping agent itself, which is a solution of carbon dioxide in water.

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