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:
Nov. 11, 2014
Filed:
Apr. 25, 2009
Patrick Notté, Wavre, BE;
Albert Devaux, Mont-Saint-Guibert, BE;
Patrick Notté, Wavre, BE;
Albert Devaux, Mont-Saint-Guibert, BE;
Straitmark Holding AG, Zug, CH;
Abstract
A method for the manufacture of amino alkylene phosphonic acids is disclosed. Pure POis hydrolyzed in the presence of a homogeneous Broensted acid catalyst whereby the pH of the reaction medium is maintained below 5 and the free water content of said reaction medium is, after the POhydrolysis has been completed, from 0 to 40%. The required amine component can be added before, during, or in one preferred execution, after the POhydrolysis has been completed. Formaldehyde is then added and the reaction mixture containing the POhydrolysate, the amine and the formaldehyde is reacted in presence of a Broensted acid catalyst selected from homogeneous and heterogeneous species. The amino alkylene phosphonic acid reaction product can then be recovered in a manner known per sé.