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:
May. 28, 2013
Filed:
Apr. 12, 2010
Youquan Deng, Gansu, CN;
Liguo Wang, Gansu, CN;
Yubo MA, Gansu, CN;
Xiaoguang Guo, Gansu, CN;
Stefan Wershofen, Mönchengladbach, DE;
Stephan Klein, Shanghai, CN;
Hongchao LI, Pudong, CN;
Youquan Deng, Gansu, CN;
Liguo Wang, Gansu, CN;
Yubo Ma, Gansu, CN;
Xiaoguang Guo, Gansu, CN;
Stefan Wershofen, Mönchengladbach, DE;
Stephan Klein, Shanghai, CN;
Hongchao Li, Pudong, CN;
Bayer MaterialScience AG, Leverkusen, DE;
Abstract
The present invention pertains to a novel method for preparing a carbamate, in which the method comprises reacting an aliphatic substituted urea and/or its derivatives, with a hydroxyl group containing compound to obtain a carbamate. In addition, the present invention provides a novel catalyst which is suitable for catalyzing the reaction to form a carbamate, and a method for preparing the novel catalyst. The method of the present invention for preparing a carbamate does not involve the application of carbon monoxide which is toxic, and the reaction conditions are relatively mild with high catalytic activity, high reaction selectivity of the catalyst, and a relatively short reaction time. Furthermore, the catalyst is separated from the reaction system and reused easily, which will facilitates scale up and industrial application.