Method for preparing aromatic bischloroformate compositions

Details Method for preparing aromatic bischloroformate compositions Method for preparing aromatic bischloroformate compositions

1987-12-04

1991-04-30

Garner, Vivian

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

Organic compounds

Halocarbonate esters

528370, 528371, 528372, 544347, 548444, 549 16, 549 17, 549 44, 549308, 549359, 549461, 558268, 558282, C07C 6802, C07C 6996

Patent

active

050119672

ABSTRACT:
Bischloroformate oligomer compositions are prepared by passing phosgene into a heterogeneous aqueous-organic mixture containing at least one dihydroxyaromatic compound, with simultaneous introduction of a base at a rate to maintain a specific pH range and to produce a specific volume ratio of aqueous to organic phase. By this method, it is possible to employ a minimum amount of phosgene. The reaction may be conducted batchwise or continuously. The bischloroformate composition may be employed for the preparation of cyclic polycarbonate oligomers or linear polycarbonate, and linear polycarbonate formation may be integrated with bischloroformate composition formation in a batch or continuous process.

REFERENCES:
patent: 4638077 (1987-01-01), Brunelle et al.
patent: 4701544 (1987-10-01), Silva

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