Patent · US Expired

Process and apparatus for the manufacture of linear high molecular weight polyesters

US4235844A · kind A · utility

65Cited by

8References

3Claims

0Family size

Assignee

BASF SE

Inventors

Hans-Josef Sterzel · Schifferstadt, DE
Kasimir Von Dziembowski · Bischofswerda, DE
Hans Pirzer · Bischofswerda, DE

Key dates

Filing date	Mar 27, 1979
Grant date	Nov 25, 1980
Priority date	—
Expiry date	Mar 27, 1999

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB01J2219/00168
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A process for the manufacture of high molecular weight linear polyesters which are derived from dicarboxylic acids or their ester-forming derivatives and from diols, by condensing polyester precondensates, having a relative viscosity of at least 1.05, at from 270.degree. to 340.degree. C. under reduced pressure, the condensation being started at from 290.degree. to 340.degree. C. and the temperature being lowered as the condensation progresses, the final temperature being at least 10.degree. C. above the melting point of the particular polyester produced, and an apparatus for carrying out the process.

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