Two-stage process for the production of thermoplastic polycarbon

Details Two-stage process for the production of thermoplastic polycarbon Two-stage process for the production of thermoplastic polycarbon

1994-04-07

1995-03-21

Kight, III, John

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528196, 528198, 528200, C08G 6400

Patent

active

053996593

ABSTRACT:
The invention relates to a two-stage process for the production of thermoplastic, solvent-free lightly branched polycarbonates in the melt using ammonium and/or phosphonium catalysts in the first stage and alkali metal and/or alkaline earth metal catalysts in the second stage.

REFERENCES:
patent: 3442854 (1969-05-01), Curtius et al.
patent: 5026817 (1991-06-01), Sakashita et al.
patent: 5097002 (1992-03-01), Sakashita et al.
patent: 5142018 (1992-08-01), Sakashita et al.
patent: 5151491 (1992-09-01), Sakashita et al.
Chemistry & Physics of Polycarbonates, Polymer Reviews, H. Schnell, vol. 9, John Wiley & Sons, Inc. (1964) - pp. 44-50.

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