Patent · US Expired

Process for the production of polycarbonate solutions

US4873314A · kind A · utility

5Cited by

7References

2Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Klaus Berg · Krefeld, DE
Karsten-Josef Idel · Krefeld, DE
Ulrich Grigo · New Martinsville, US

Key dates

Filing date	Feb 18, 1988
Grant date	Oct 10, 1989
Priority date	—
Expiry date	Feb 18, 2008

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08J2369/00
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The invention relates to a process for the production of solutions of polycarbonates in organic inert solvents which is characterized in that from 2.5 ppm to 100 ppm phosphorous acid, based on the weight of the diphenol used for polycarbonate production, are added to the emulsion of the two phases obtainable by the known two-phase interfacial process and the emulsion is worked up in known manner.

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