Method for preparing aromatic bischloroformate compositions and

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

1994-08-25

1996-12-03

Seidleck, James J.

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

Synthetic resins

From reactant having a halogen atom or oxygen single bonded...

528198, 528199, 528370, C08G 6400

Patent

active

055809510

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: 4737573 (1988-04-01), Silva et al.
patent: 4939230 (1990-07-01), Munjal et al.
patent: 4997903 (1991-05-01), Okamoto
patent: 5011967 (1991-04-01), Silva et al.

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