The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 21, 2006
Filed:
Dec. 22, 2003
Georg Heinrich Grosch, Bad Dürkheim, DE;
Dirk Franke, Ludwigshafen, DE;
Manfred Munzinger, Dirmstein, DE;
Kathrin Harre, Dresden, DE;
Eva Baum, Schwarzheide, DE;
Michael Stösser, Neuhofen, DE;
Georg Heinrich Grosch, Bad Dürkheim, DE;
Dirk Franke, Ludwigshafen, DE;
Manfred Munzinger, Dirmstein, DE;
Kathrin Harre, Dresden, DE;
Eva Baum, Schwarzheide, DE;
Michael Stösser, Neuhofen, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
A process for preparing polyether polyols includes a precipitation step, a recrystallization step, and a reaction step. In the precipitation step, a multimetal cyanide compound is precipitated by reaction of a metal salt with a cyanometalate compound. In the recrystallization step, the multimetal cyanide compound precipitated above is recrystallized by adding further metal salt and/or further cyanometalate compound. The recrystallization forms a multimetal cyanide catalyst compound. In the reaction step, an initiator and one or more alkylene oxide are reacted in the presence of the multimetal cyanide catalyst compound.