Method for making oligomeric carbonate bischloroformates with lo

Details Method for making oligomeric carbonate bischloroformates with lo Method for making oligomeric carbonate bischloroformates with lo

1989-04-03

1992-11-10

Prescott, Arthur C.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carbonate esters

558281, C08G 6362

Patent

active

051625644

ABSTRACT:
Oligomeric carbonate bischloroformates are prepared with low phosgene usage by phosgenating a dihydroxyaromatic compound in an interfacial reaction in the presence of small amounts of trialkylamine, preferably, triethylamine. In this invention, the molar ratio of phosgene to dihydroxyaromatic compound, hydrolysis of phosgene, formation of such byproducts as monochloroformates and hydroxyl-terminated polycarbonate oligomers, and batch time are minimized and consumption of the dihydroxylaromatic compound is substantially complete.

REFERENCES:
patent: 3646102 (1972-02-01), Kobayashi et al.
patent: 4038252 (1977-07-01), Vernaleken et al.
patent: 4089888 (1978-05-01), Tokumitsu et al.
patent: 4122112 (1978-10-01), Koda et al.
patent: 4737573 (1988-04-01), Silva et al.
patent: 4743676 (1988-05-01), Silva et al.

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