Process for preparing a branched polycarbonate

Details Process for preparing a branched polycarbonate Process for preparing a branched polycarbonate

1979-05-31

1981-10-13

Schain, Howard E.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528125, 528126, 528173, 528176, 528179, 528180, 528181, 528182, 528190, 528191, 528193, 528194, 528195, C08G 6362

Patent

active

042949530

ABSTRACT:
A process for preparing a thermoplastic, randomly branched aromatic polycarbonate is disclosed which comprises reacting a carbonate precursor, a dihydric phenol, and a dianhydride branching agent and maintaining the resultant reaction medium at a pH of from about 9 to about 12 to thereby produce a thermoplastic randomly branched aromatic polycarbonate.

REFERENCES:
patent: 3816373 (1974-06-01), Hoogeboom
patent: 4001184 (1977-01-01), Scott
patent: 4130548 (1978-12-01), Kochanowski
patent: 4238597 (1980-12-01), Markezich et al.

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