| 摘要 |
Automatic dishwashing detergent compositions comprising certain cobalt catalysts are provided. More specifically, the invention relates to automatic dishwashing detergents which provide enhanced cleaning/blea ching benefits (especially tea stain removal) through the selection of cobalt bleach catalyst having the formula: ¢Co(NH3)n(M)m(B)b!Ty, wh erein cobalt is in the +3 oxidation state; n is 4 or 5 (preferably 5); M is one or more ligands coordinated to the cobalt by one site; m is 0, 1 or 2 (preferably 1), B is a ligand coordinated to the cobalt by two sites; b is 0 or 1 (preferably 0), and when b = 0, then m + n = 6, and when b - 1, then m = O and n = 4; and T is one or more appropriately selected counteranions present in a number y, where y is a n integer to obtain a charge-balance salt (preferably y is 1 to 3; most preferably 2 when T is a -1 charged anion); and wherein further sai t catalyst has a base hydrolysis rate constant of less than 0.23 M-1 s-1 (25 .degree.C). Preferred automatic dishwashing compositions compri se amylase and/or protease enzymes. Included are methods for washing tableware in domestic automatic dishwashing appliances using the cobalt catalysts.
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