Isolation of poly(ester)carbonates from methylene chloride using

Details Isolation of poly(ester)carbonates from methylene chloride using Isolation of poly(ester)carbonates from methylene chloride using

1992-08-20

1993-09-28

Anderson, Harold D.

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

Synthetic resins

Treating polymer containing material or treating a solid...

528196, 528483, 528491, C08G 6440, C08G 6390

Patent

active

052487636

ABSTRACT:
A process for isolating a poly(ester)carbonate resin from its methylene chloride solution is disclosed. The process entails combining a solution which contains 5 to 30% by weight resin with carbon dioxide fluid in a two-component nozzle under pressures of 90 to 180 bar and at temperatures of 50.degree. to 75.degree. C., while maintaining in said the two-component nozzle a back-pressure of 85 to 150 bar, and introducing the resin into a separation vessel with retention of dust particles. Importantly, the relative quantities of carbon dioxide fluid and polymer solution used in the two-component nozzle are between 10 and 3 parts carbon dioxide fluid per one part of polymer solution, and the carbon dioxide fluid contains 10 to 1000 ppm methylene chloride. The process avoids blockage of said nozzle.

REFERENCES:
patent: 5080845 (1992-01-01), Herrmann et al.
patent: 5126428 (1992-06-01), Freitag et al.

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