Method for controlling the effective level of catalyst during th

Details Method for controlling the effective level of catalyst during th Method for controlling the effective level of catalyst during th

1996-12-20

1999-03-23

Mosley, Terressa

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

502300, 502344, 526 59, 528198, C08G 6400

Patent

active

058861327

ABSTRACT:
A method for determining the effective level of catalyst for the preparation of a polycarbonate polymer by a transesterification reaction is disclosed. The method involves measurement of the leaving group by-product (usually phenol) produced in a test reaction between an aromatic dihydroxy compound and a carbonic acid diester, in the presence of a known amount of transesterification catalyst. The by-product production values can be compared with by-product reference values to calculate the effective level of catalyst. This data can be used to efficiently control catalytic activity in a production scale reaction for producing polycarbonate polymer.

REFERENCES:
patent: 4619901 (1986-10-01), Webb et al.
patent: 4956426 (1990-09-01), Ardell et al.
patent: 5116915 (1992-05-01), Mamedov

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