Preparation of polycarbonates in a homogeneous solution

Details Preparation of polycarbonates in a homogeneous solution Preparation of polycarbonates in a homogeneous solution

1981-11-04

1983-03-29

Anderson, Harold D.

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

Synthetic resins

Effecting a change in a polymerization process in response...

526 60, 526 71, 528196, 528199, C08G 6362

Patent

active

043784542

ABSTRACT:
Polycarbonates are prepared in homogeneous solutions from dihydric phenols and phosgene wherein the stoichiometric end point for the addition of phosgene is accurately controlled by using 4-(p-nitrobenzyl) pyridine as a colorometric indicator for the end point in a series of samples of the reaction solution.

REFERENCES:
patent: 3144432 (1964-08-01), Fox
patent: 3641025 (1972-02-01), Petree
Tetrahedron Letters, No. 1, 1972, pp. 27-28, Cockerill et al.

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