Method for producing butanediol dimethacrylates

US8039664B2 · kind B2 · utility

Assignee

• Evonik Röhm GmbH · DE

Inventors

• Joachim Knebel · Zwingenberg, DE
• Thorben Schuetz · Seeheim-Jugenheim, DE
• Harald Trauthwein · Munich, DE
• Thomas Kehr · Heilbad Heiligenstadt, DE
• Guenther Lauster · Worms, DE
• Guido Protzmann · Bensheim, DE
• Gerhard Koelbl · Gernsheim, DE
• Guenter Westhaeuser · Guntersblum, DE

Key dates

• Filing date: May 8, 2008
• Grant date: Oct 18, 2011
• Expiry date: May 8, 2028

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C67/03
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

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.