Patent · US Expired

Process for working up polycarbonates

US4338429A · kind A · utility

7Cited by

6References

8Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Volker Serini · Krefeld, DE
John Goossens · Cologne, DE
Ludwig Bottenbruch · Krefeld, DE
Dieter Freitag · Krefeld, DE

Key dates

Filing date	Jul 7, 1980
Grant date	Jul 6, 1982
Priority date	—
Expiry date	Jul 7, 2000

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G64/406
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The present invention relates to a process for working up alkaline two-phase mixtures which have been obtained in the synthesis of polycarbonates by the two-phase boundary process, characterized in that for the separation of the alkaline two-phase mixture into an organic phase and an aqueous phase, the mixture is supplied with shearing energy and/or added are one or more cationic emulsifying agents and/or dispersing agents and/or in that, for the separation of the acidified two-phase mixture into an organic phase and an aqueous phase, the mixture is supplied with shearing energy and/or added are one or more cationic emulsifying agents and/or dispersing agents and/or in that the organic phase which was separated off after the acidification is washed with water to which one or more water-soluble, organic anionic compounds have been added.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.