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:
Jul. 10, 2007
Filed:
May. 21, 2003
Alexander Wartini, Heidelberg, DE;
Matthias Dernbach, Dossenheim, DE;
Gerlinde Tischer, Ruhland, DE;
Tilman Sirch, Schifferstadt, DE;
Alexander Wartini, Heidelberg, DE;
Matthias Dernbach, Dossenheim, DE;
Gerlinde Tischer, Ruhland, DE;
Tilman Sirch, Schifferstadt, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
The invention provides a process for preparing polyester polyols of polyhydric alcohols by mono- or polyesterification of at least one carboxylic acid having at least two acid groups and/or at least one derivative of a dicarboxylic acid with polyhydric alcohols, optionally with the addition of a catalyst, while removing the water of reaction, wherein the polyhydric alcohol used has a formaldehyde acetal content of less than 500 ppm.