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:
Sep. 01, 1998
Filed:
Mar. 18, 1997
Hitoshi Yano, Suita, JP;
Yuuji Shimasaki, Otsu, JP;
Nippon Shokubai Co., Ltd., Osaka, JP;
Abstract
There is provided a process for producing a cyclic N-vinyl carboxylic acid amide stably in safety and low cost, using, as starting raw materials, a cyclic carboxylic acid ester and monoethanolamine both available inexpensively and easily. The process comprises subjecting a cyclic carboxylic acid ester and monoethanolamine to an intermolecular dehydration reaction (a first-step reaction) in a liquid phase to produce a cyclic N-(2-hydroxyethyl) carboxylic acid amide and then subjecting the cyclic N-(2-hydroxyethyl) carboxylic acid amide to an intramolecular dehydration reaction (a second-step reaction) in a gas phase in the presence of an oxide catalyst containing an alkali metal element and/or an alkaline earth metal element and silicon, to produce a cyclic N-vinyl carboxylic acid amide.