Catalytic, interfacial, pH controlled preparation of polyester p

Details Catalytic, interfacial, pH controlled preparation of polyester p Catalytic, interfacial, pH controlled preparation of polyester p

1992-04-23

1993-12-28

Anderson, Harold D.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528176, 528182, C08G 6364

Patent

active

052740684

ABSTRACT:
Polycarbonates are prepared from dihydric phenols, carbonate precursors, an aliphatic dicarboxylic acid having from 4 to 8 carbon atoms, and a catalyst selected from the group consisting of phase transfer catalysts and trialkylamines, wherein the initial pH is maintained from 3 to 8 until 40 to 90 percent of the total amount of carbonate precursor is added, and the pH is then raised to 10-12 until the reaction is complete.

REFERENCES:
patent: 3169121 (1965-02-01), Goldberg
patent: 4238596 (1980-12-01), Quinn
patent: 4238597 (1980-12-01), Markezich et al.
patent: 4280683 (1981-07-01), Knierim
patent: 4286083 (1981-08-01), Kochanowski
patent: 4628081 (1986-12-01), Mark et al.
patent: 4677183 (1987-06-01), Mark et al.
patent: 4983706 (1991-01-01), Fontana et al.
patent: 5015720 (1991-05-01), Boden et al.
patent: 5025081 (1991-06-01), Fontana et al.

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