Optical quality polycarbonates

Details Optical quality polycarbonates Optical quality polycarbonates

1995-07-11

2000-08-22

Boykin, Terressa M.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

528125, 528171, 528174, 528196, 528198, 528202, 528371, B32B 302

Patent

active

061069183

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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