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:
Nov. 05, 2013
Filed:
Dec. 07, 2009
Tilman Sirch, Schifferstadt, DE;
Michael Steiniger, Neustadt, DE;
Steffen Maas, Bubenheim, DE;
Stefan Rittinger, Mannheim, DE;
Tilman Sirch, Schifferstadt, DE;
Michael Steiniger, Neustadt, DE;
Steffen Maas, Bubenheim, DE;
Stefan Rittinger, Mannheim, DE;
BASF SE, , DE;
Abstract
The present invention relates to a process for purifying crude polymethylol which comprises polymethylol of the formula (I)(HOCH)—C—R  (I)in which each R is independently a further methylol group or an alkyl group having 1 to 22 carbon atoms or an aryl or aralkyl group having 6 to 22 carbon atoms, and also hydroxy acid of the formula (IV) in which each R is independently as defined above, which comprises performing the purification in a distillation column, the bottom of the distillation column being connected to an evaporator with a short residence time. The present invention further relates to a composition comprising polymethylol and 1 to 10 000 ppm by weight of an ester of polymethylol and of a hydroxy acid and to the use thereof.