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:
Feb. 27, 2007
Filed:
Apr. 25, 2003
Torsten Groth, Odenthal, DE;
Alfred Mitschker, Odenthal, DE;
Ralf-johann Moritz, Neuss, DE;
Thomas Klein, Köln, DE;
Thomas Menzel, Hilden, DE;
Wolfgang Wirth, Bergisch Gladbach, DE;
Torsten Groth, Odenthal, DE;
Alfred Mitschker, Odenthal, DE;
Ralf-Johann Moritz, Neuss, DE;
Thomas Klein, Köln, DE;
Thomas Menzel, Hilden, DE;
Wolfgang Wirth, Bergisch Gladbach, DE;
Lanxess Deutschland GmbH, Leverkusen, DE;
Abstract
The invention relates to a process for the preparation of iminodisuccinic acid ammonium metal salts, characterized in that, in a first stage, maleic anhydride (MA), alkali metal hydroxide and water are mixed in the molar ratio of 2:0–3:5–30 and then ammonia is metered in in the ratio MA: ammonia 2:1.5–8, in order to obtain iminodisuccinic acid ammonium salts which, in a second stage, are reacted with metal oxides, metal hydroxides (and) or other metal salts or their mixtures to give iminodisuccinic acid ammonium metal salts of the formula 8,IDA(NH)(Na)(K)(Me).(NH)Formula 8in which