N,n'-(1-oxo-1,2-ethanediyl)-bis-(aspartic acid), salts and use in detergent compositions

Abstract From the Canadian patent

Disclosed are the N, N'-(1-oxo-1,2-ethanediyl)-bisaspartates 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- …