Patent ID: 6271413
Filing Date: 2001-08-07
Classification: B01J,C07C,C07D,C08G

Abstract:
A process for the preparation of polytetramethylene ether glycol diesters of the formulaR--CO--O(--CH.sub.2 -CH.sub.2 -CH.sub.2 -CH.sub.2 -O).sub.n -COR.sub.1 wherein R and R.sub.1 are identical or different and are each an alkyl radical or a derivative thereof, and n is an integer from 2 to 200, comprising polymerizing tetrahydrofuran in the presence of a polymerization catalyst comprising a calcined magnesium-alminum hydrosilicate, wherein said magnesium-aluminum hydrosilicate is neutral, weakly basic or protonated and is a natural or synthetic attapulgite or sepiolite.