Two-stage process for the manufacture of thermoplastic polycarbo

Details Two-stage process for the manufacture of thermoplastic polycarbo Two-stage process for the manufacture of thermoplastic polycarbo

1996-01-31

1997-07-29

Mosley, Terressa

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

Synthetic resins

Polymerizing in two or more physically distinct zones

2641761, 26421124, 528196, 528198, 528199, 528200, 528502B, C08F 200

Patent

active

056523130

ABSTRACT:
The present invention provides a two-stage melt process for the manufacture of thermoplastic, solvent-free, low-branched polycarbonates with low OH end-group contents with the use of ammonium or phophonium catalysts in the first stage and alkali and alkaline earth catalysts in the second stage.

REFERENCES:
patent: 3442854 (1969-05-01), Curtius et al.
patent: 5340905 (1994-08-01), Kuhling et al.
patent: 5399659 (1995-03-01), Kuhling et al.
patent: 5432250 (1995-07-01), Yamato et al.

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