Isolation of polycarbonate with carbon dioxide

Details Isolation of polycarbonate with carbon dioxide Isolation of polycarbonate with carbon dioxide

1992-09-04

1993-10-05

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

Patent

active

052506584

ABSTRACT:
According to the invention, a special process for isolating polycarbonate from methylene chloride at temperatures of 30.degree. to 80.degree. C. in the form of a powder with residual solvent contents below 5% by weight is started up as a continuous process by starting up in a two-component nozzle, in which CO.sub.2 -containing fluid and the polymer solution are continuously combined, with a large excess of CO.sub.2 and then allowing the polycarbonate/methylene chloride/CO.sub.2 fluid system to pass through the gel-forming range of the polycarbonate/methylene chloride/CO.sub.2 phase diagram with continuous reduction of the CO.sub.2 throughput to a ratio of CO.sub.2 to organic solution of 4:1 to 2:1. The process started up in this way has a particularly long useful life.

REFERENCES:
patent: 4207942 (1980-06-01), Cowan et al.
patent: 4634761 (1987-01-01), Mendiratta et al.
patent: 4918160 (1990-04-01), Kondoh et al.
Macromolecules, vol. 18, No. 4, 1985, pp. 674-680, American Chemical Society; M. A. McHugh et al. "Separating polymer solutions with supercritical fluids".

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