Patent · US Expired

Method for producing polytetrahydrofurane having a low color indices

US7148318B2 · kind B2 · utility

0Cited by

5References

5Claims

0Family size

Assignee

BASF SE

Inventors

Anton Meier · Birkenheide, DE
Volkmar Menger · Neustadt, DE
Christoph Sigwart · Schriesheim, DE

Key dates

Filing date	May 19, 2003
Grant date	Dec 12, 2006
Priority date	—
Expiry date	Oct 11, 2023

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G2650/14
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The invention provides a process for preparing polytetrahydrofuran, tetrahydrofuran copolymers, their monoesters or diesters and the monoesters or diesters of polytetrahydrofuran having a low color number in the presence of a catalyst, which comprises converting crude tetrahydrofuran which has been prepared in a manner per se into pure tetrahydrofuran by distillation, subsequently subjecting the latter to essentially complete hydrogenation and using the high-purity tetrahydrofuran obtained in this way for the polymerization directly after its preparation.

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