Patent · US Expired

Branched, high-molecular weight thermoplastic polycarbonates

US4185009A · kind A · utility

125Cited by

2References

24Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Karsten-Josef Idel · Krefeld, DE
Dieter Frietag · Krefeld, DE
Werner Nouvertne · Krefeld, DE

Key dates

Filing date	Oct 26, 1977
Grant date	Jan 22, 1980
Priority date	—
Expiry date	Oct 26, 1997

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S260/24
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The invention relates to a process for the preparation of branched, thermoplastic, high-molecular weight and soluble polycarbonates having improved properties, by incorporation of 3,3-bis-(4-hydroxyaryl)-oxindoles as a branching agent. The invention further relates to the polycarbonates obtained in accordance with this process.

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