Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From reactant having a halogen atom or oxygen single bonded...
Patent
1986-10-10
1988-04-12
Anderson, Harold D.
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 6362
Patent
active
047375736
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.
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Pyles Robert A.
Silva James M.
Anderson Harold D.
Davis Jr. James C.
General Electric Company
Magee Jr. James
Pittman William H.
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