Process for the purification of polycarbonates

Details Process for the purification of polycarbonates Process for the purification of polycarbonates

1975-12-04

1977-03-22

Gotts, Lewis

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260 47XA, C07C 6808

Patent

active

040137023

ABSTRACT:
The free and bonded residual phenol content of oligocarbonates prepared by transesterification between a diol and a diphenyl carbonate is substantially reduced by a process comprising (i) introducing water into the oligocarbonate in the liquid state at an elevated temperature under reduced pressure and (ii) purging the mixture with an inert gas to effect degassing. The purified oligocarbonates are particularly resistant to yellowing.

REFERENCES:
patent: 3213060 (1965-10-01), Jackson et al.
patent: 3470133 (1969-09-01), Ohme
patent: 3668181 (1972-06-01), Oxenrider

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