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:
Jun. 28, 1994
Filed:
Oct. 15, 1992
Kohei Morikawa, Kawasaki, JP;
Toru Sasaki, Kawasaki, JP;
Kazuhiro Omori, Kawasaki, JP;
Hideo Miyata, Kawasaki, JP;
Yoko Suguri, Kawasaki, JP;
Showa Denko K.K., Tokyo, JP;
Abstract
N-acylaminomethylphosphonic acid is prepared from an N-methylolamide compound and a phosphorus trihalide. The starting compounds are mixed and heated in an aprotic solvent in the presence of water in a 0.25 to 2.5 times molar amount relative to the phosphorus trihalide at 60.degree. to 160.degree. C., and the reaction mixture is contacted with water. The N-methylolamide compound is a compound selected from the group consisting of N-methylol-lower alkylamides and N-methylolarylamides. The phosphorus trihalide is preferably phosphorus trichloride. As the aprotic solvent is used one or more of hydrocarbons, halogenated hydrocarbons, ethers, polyethers, nitriles, and aromatic nitro compounds. The mixing may be carried out at a temperature of 60.degree. C. The water present at the initiation of the reaction is in a 1.0 to 1.8 times molar amount relative to the phosphorus trihalide.