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:
Jan. 12, 1988
Filed:
Mar. 16, 1987
Helmut Blum, Duesseldorf, DE;
Siglinde Hemmann, Meerbusch, DE;
Henkel Kommanditgesellschaft auf Aktien, Duesseldorf, DE;
Abstract
3-Alkyl-3-oxo-1-aminopropane-1,1-diphosphonic acids and water-soluble salts thereof corresponding to the formula ##STR1## in which R.sup.1 represents an unbranched or branched C.sub.1 -C.sub.8 alkyl group, R.sup.2 and R.sup.3 independently of one another represent methyl or ethyl, and each M represents H or a cation of a water-soluble base, to a process for producing these compounds wherein oxonitriles corresponding to the formula: ##STR2## in which R.sup.1, R.sup.2 and R.sup.3 are as defined above, are reacted with mixtures of a phosphorus trihalide PX.sub.3, where X represents fluorine, chlorine or bromine, with phosphorous acid, the reaction mixture is hydrolyzed, and the reaction products are optionally converted into water-soluble salts; and to the use of the resulting compounds corresponding to general formula (III).