Patent · US Expired

Method for producing highly viscous polyesters

US6515044B1 · kind B1 · utility

25Cited by

10References

13Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Karsten-Josef Idel · Krefeld, DE
Hans-Jürgen Dietrich · Frankfurt, DE
Matthias Müller · Kirchheim unter Teck, DE

Key dates

Filing date	Apr 9, 2001
Grant date	Feb 4, 2003
Priority date	—
Expiry date	Apr 9, 2021

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08J2467/00
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The present invention relates to a process for the preparation of high-viscosity polyesters with a reduced content of acid end groups, wherein a masterbatch of low-viscosity polyesters and oxazolines is prepared, this is then mixed with a higher-viscosity polyester and this mixture (dry blend) is further processed.

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