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. 08, 1991
Filed:
Aug. 10, 1989
Mark W Glogowski, Cincinnati, OH (US);
Frederick A Hartman, Cincinnati, OH (US);
Stephen W Heinzman, Cincinnati, OH (US);
Christopher M Perkins, Cincinnati, OH (US);
The Procter & Gamble Company, Cincinnati, OH (US);
Abstract
Disclosed are the N,N'-(1-oxo-1,2-ethanediyl)-bisaspartates comprising the moiety ##STR1## methods for their preparation (including an unexpected preparation from glyoxal bisulfite and aspartic acid in concentrated aqueous alkaline media) and useful compositions containing the same; illustrative are general-purpose sequestrant compositions, chelating agent compositions for transition metals such as iron, manganese and copper, general-purpose laundry detergent compositions and detergent compositions comprising perborate bleach, a bleach activator and, as a bleach stabilizer/performance enhancer, the novel bisaspartates. These unique nonphosphorus compounds are useful at low levels and differ from traditional --N--C--C--N-- chelating agents such as ethylenediaminetetraacetates by the presence of one amino- and one amido- functional group which it is believed will provide additional advantages, such as improved biodegradation.