Patent · US Active

Polycarbonates with good wettability

US7799889B2 · kind B2 · utility

3Cited by

8References

9Claims

0Family size

Assignee

Bayer MaterialScience AG · DE

Inventors

Alexander Meyer · Mülheim an der Ruhr, DE
Helmut Einberger · Odenthal, DE
Wolfgang Ebert · Krefeld, DE
Michael Prein · Brasschaat, BE
Wilfried Haese · Rheydt, DE
Uli Franz · Solingen, DE
Stephan Konrad · Dormagen, DE

Key dates

Filing date	Dec 20, 2005
Grant date	Sep 21, 2010
Priority date	—
Expiry date	Jul 7, 2027

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31507
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The present invention provides a polycarbonate resin produced by the continuous interfacial process characterized in that after alkaline hydrolysis with sodium hydroxide, the polycarbonate resin contains an amount of 0.01 to 150 ppm of carbamate compounds according to formula (1)said amount measured by high pressure liquid chromatography, wherein R1 and R2 independently of one another denote hydrogen or C1-C12-alkyl, or together denote C4-C12-alkylidene, and R3 and R4 independently of one another denote hydrogen. C1-C12-alkyl or phenyl, or together with the carbon atom to which they are bonded form cyclohexyl or trimethylcyclohexyl, the process comprising phosgene reacting with at least one bisphenol at 8 to 17% molar excess of phosgene relative to the bisphenol.

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