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:
Oct. 29, 2002
Filed:
May. 07, 2001
Associated Octel Company Limited, Manchester, GB;
Abstract
The present invention provides a process for the preparation of a chelant or chelating agent complex of the formula L•B•M. L is an amino acid derivative including two optically active amino acids are linked via a (CH2) group, wherein the (CH2) group is attached to a nitrogen of each optically active amino acid, the optically active amino acid may be the same or different; and wherein n is an integer from 1 to 10; B is a base; and M is a metal. The process comprises the steps of (i) providing a reaction mixture comprising L and B and having a pH of less than 7.5; (ii) contacting the reaction mixture with M to provide a first complex mixture; and (iii) contacting the first complex mixture with a further amount of B to provide a second complex mixture. The second complex mixture can further be sequentially contacted with further amounts of M and further amounts of B. Alternatively, the second complex mixture can be heated.