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:
Oct. 18, 2011
Filed:
May. 08, 2008
Joachim Knebel, Alsbach-Haehnlein, DE;
Thorben Schuetz, Seeheim-Jugenheim, DE;
Harald Trauthwein, Buerstadt, DE;
Thomas Kehr, Muehltal, DE;
Guenther Lauster, Worms, DE;
Guido Protzmann, Bensheim, DE;
Gerhard Koelbl, Gernsheim, DE;
Guenter Westhaeuser, Guntersblum, DE;
Joachim Knebel, Alsbach-Haehnlein, DE;
Thorben Schuetz, Seeheim-Jugenheim, DE;
Harald Trauthwein, Buerstadt, DE;
Thomas Kehr, Muehltal, DE;
Guenther Lauster, Worms, DE;
Guido Protzmann, Bensheim, DE;
Gerhard Koelbl, Gernsheim, DE;
Guenter Westhaeuser, Guntersblum, DE;
Evonik Roehm GmbH, Darmstadt, DE;
Abstract
The present invention relates to a process for preparing butanediol dimethacrylates, which comprises the transesterification of butanediol with an ester of methacrylic acid in the presence of catalysts, wherein a combination comprising at least one lithium compound and at least one calcium compound is used as catalyst, at least one of the compounds of lithium and/or of calcium is an oxide, a hydroxide, an alkoxide having from 1 to 4 carbon atoms or a carboxylate having from 1 to 4 carbon atoms and at least part of the reaction is carried out in the presence of an effective amount of water. The process of the invention makes a particularly inexpensive preparation of butanediol dimethacrylates having a very high purity possible.