Process for producing polytetramethylene ether glycol diester on aluminium magnesium silicate catalysis
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 7, 2001
Grant Date -
N/A
app pub date -
Dec 3, 1997
filing date -
Apr 16, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An improved process for the preparation of polytetramethylene ether glycol diesters of the formula R--CO--O(--CH.sub.2 -CH.sub.2 -CH.sub.2 -CH.sub.2 -O).sub.n -COR.sub.1 in which R and R.sub.1 are identical or different and are an alkyl radical or a derivative thereof, by polymerization of tetrahydrofuran in the presence of a fixed-bed polymerization catalyst and a carboxylic acid anhydride. Through use of neutral or weakly basic magnesium-aluminium hydrosilicates instead of the known acidic montmorillonite, zeolite or kaolin catalysts, polymers with more uniform properties and a narrower molecular weight distribution are obtained at a higher rate of polymerization, even when technical-grade tetrahydrofuran is used.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully