Method for producing purified polycarbonate resin with fluid con

Details Method for producing purified polycarbonate resin with fluid con Method for producing purified polycarbonate resin with fluid con

1989-03-23

1990-04-17

Anderson, Harold D.

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

Synthetic resins

Treating polymer containing material or treating a solid...

264340, 264345, 528196, C08G 6362

Patent

active

049181602

ABSTRACT:
A method for producing a purified polycarbonate resin is disclosed, comprising contacting a solid polycarbonate resin with a fluid comprising at least 70% by weight of carbon dioxide and having a temperature of 30.degree. to 120.degree. C. and a pressure of at least 10 kg/cm.sup.2. The method can effectively remove almost all the impurities contained in the polycarbonate resin within a very short period of time, thereby providing highly purified polycarbonate resin materials which are suitably used in the fields of information, electronic and medical industries.

REFERENCES:
patent: 3668181 (1972-06-01), Oxenrider

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