| 摘要 |
<p>Automatic dishwashing detergent compositions comprising certain cobalt catalysts are provided. More specifically, the invention relates to automatic dishwashing detergents which provide enhanced cleaning/bleaching benefits (especially tea stain removal) through the selection of cobalt bleach catalyst having the formula: [Co(NH3)n(M)m(B)b]Ty, wherein 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 = 0 and n = 4; and T is one or more appropriately selected counteranions present in a number y, where y is an 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 sait catalyst has a base hydrolysis rate constant of less than 0.23 M-1 s-1 (25 °C). Preferred automatic dishwashing compositions comprise amylase and/or protease enzymes. Included are methods for washing tableware in domestic automatic dishwashing appliances using the cobalt catalysts.</p> |
