Patent · US Expired

Catalyst and method for the production of polytetrahydrofuran

US6362312B1 · kind B1 · utility

6Cited by

9References

9Claims

0Family size

Assignee

BASF SE

Inventors

Karsten Eller · Stockach, DE
Heinz Rutter · Hochdorf-Assenheim, DE
Michael Hesse · Westlake Village, US
Rainer Becker · Bad Dürkheim, DE

Key dates

Filing date	Apr 10, 2000
Grant date	Mar 26, 2002
Priority date	—
Expiry date	Apr 10, 2020

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G65/2657
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

In a process for preparing polytetrahydrofuran, polytetrahydrofuran copolymers or diesters or monoesters thereof comprises polymerizing tetrahydrofuran in the presence of at least one telogen and/or comonomer over an acid-activated calcium montmorillonite as catalyst, the calcium montmorillonite has a BET surface area of at least 300 m2/g, an acidity of at least 0.02 mmol/g at pKa<−3 and a pore volume of at least 0.40 cm3/g for pore sizes in the range from 30 to 200 å.

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