Washing of polycarbonates with cascading train of centrifuges

Details Washing of polycarbonates with cascading train of centrifuges Washing of polycarbonates with cascading train of centrifuges

1992-11-17

1993-11-09

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, 528198, 528490, 528499, C08G 6440

Patent

active

052604187

ABSTRACT:
A continuous process for the removal of electrolytes and catalysts from organic polycarbonate solutions is disclosed. Accordingly, a solution obtained in the course of the two-phase interfacial reaction for the preparation of polycarbonate, containing thermoplastic aromatic polycarbonate and an organic solvent and up to 10 parts by weight water as well as residues of chain terminators, branching agents and diphenols is washed with water and/or hydrochloric acid through a cascading train of centrifuges. The resulting polycarbonate resin is characteristically of extremely low iron content.

REFERENCES:
patent: 4323519 (1982-04-01), Mori et al.
patent: 4845193 (1989-07-01), Umemura et al.
CA 106(20): 158460s.
Abstract-JP 1096212.

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