Claims
- 1. An automatic dishwashing composition comprising:
- (a) a catalytically effective amount of a cobalt catalyst having the formula:
- �Co(NH.sub.3).sub.n (M).sub.m (B).sub.b !T.sub.y
- wherein cobalt is in the +3 oxidation state, n is 4 or 5; M is one or more ligands coordinated to the cobalt by one site; m is 0, 1 or 2; B is a ligand coordinated to the cobalt by two sites; b is 0 or 1, 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 from 0 to 3, to obtain a charge balanced salt; and wherein further said catalyst has a base hydrolysis rate constant of less than 0.23M.sup.-1 s.sup.-1 (25.degree. C.);
- (b) from about 0.1% to about 70% by weight, of a source of hydrogen peroxide;
- (c) from about 30% to about 99.9%, by weight, of one or more automatic dishwashing adjunct materials and (d) from about 0.1% to about 10% by weight of the composition of a low foaming nonionic surfactant having a cloud point of a 1% solution in water of below about 32 degrees Celsius;
- wherein a 1% aqueous solution of said automatic dishwashing composition has a pH of less than 11.
- 2. An automatic dishwashing detergent composition according to claim 1 comprising automatic dishwashing adjunct material selected such that the composition produces less than 2 inches of suds under normal use conditions.
- 3. An automatic dishwashing detergent composition according to claim 1 comprising as part or all of the automatic dishwashing adjunct material one or more material care agents.
- 4. An automatic dishwashing detergent composition according to claim 1 comprising as part or all of the automatic dishwashing adjunct material one or more water soluble silicates.
- 5. An automatic dishwashing detergent composition according to claim 1 comprising as part or all of the automatic dishwashing adjunct material one or more bleach activators.
- 6. An automatic dishwashing detergent composition according to claim 5 wherein the bleach activator is TAED.
- 7. An automatic dishwashing detergent composition according to claim 2 comprising a cobalt catalyst of the formula:
- �Co(NH.sub.3).sub.5 M!T.sub.y.
- 8. An automatic dishwashing detergent composition comprising:
- (a) a catalytically effective amount of a cobalt catalyst having the formula:
- �Co(NH.sub.3).sub.5 OAc!T.sub.y
- wherein T is one or more counteranions present in a number y, where y is 1 or 2;
- (b) an effective amount of a source of hydrogen peroxide selected from the group consisting of perborate, percarbonate, and mixtures thereof, and
- (c) automatic dishwashing detergent adjunct materials selected from the group consisting of one or more low foaming nonionic surfactants, proteases, amylases, water soluble silicates, bleach activators and mixtures thereof.
- 9. An automatic dishwashing detergent composition according to claim 8 comprising automatic dishwashing adjunct material selected such that the composition produces less than 2 inches of suds under normal use conditions.
- 10. A method of washing tableware in a domestic automatic dishwashing appliance, said method comprising treating the soiled tableware in a automatic dishwasher with an aqueous alkaline bath comprising a source of hydrogen peroxide, a cobalt bleach catalyst having the formula:
- �Co(NH.sub.3).sub.n (M).sub.m (B).sub.b !T.sub.y
- wherein cobalt is in the +3 oxidation state, n is 4 or 5; M is one or more ligands coordinated to the cobalt by one site; m is 0, 1 or 2; B is a ligand coordinated to the cobalt by two sites; b is 0 or 1, 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 from 0 to 3, to obtain a charge balanced salt; and wherein further said catalyst has a base hydrolysis rate constant of less than 0.23M.sup.-1 s.sup.-1 (25.degree. C.)and from about 0. 1% to about 10% by weight of the composition of a low foaming nonionic surfactant having a cloud point of a 1% solution in water of below about 32 degrees Celsius; wherein a 1% aqueous solution of said aqueous alkaline bath has a pH of less than 11.
- 11. A method according to claim 10 wherein the cobalt catalyst has the formula:
- �Co(NH.sub.3).sub.5 M!T.sub.y.
- 12. A method of washing tableware in a domestic automatic dishwashing appliance, said method comprising treating the soiled tableware in an automatic dishwasher with an aqueous alkaline bath comprising an automatic dishwashing detergent composition according to claim 8.
- 13. A method for removing tea and/or coffee stains from tableware, said method comprising treating tea-stained tableware with an aqueous alkaline bath comprising a source of hydrogen peroxide and the cobalt bleach catalyst of the formula �Co(NH.sub.3).sub.5 OAc!T.sub.y, wherein T is one or more counteranions present in a number y, where y is 1 or 2.
- 14. An automatic dishwashing rinse aid composition comprising:
- (a) a catalytically effective amount of a cobalt catalyst having the formula:
- �Co(NH.sub.3).sub.n (M).sub.m (B).sub.b !T.sub.y
- wherein cobalt is in the +3 oxidation state, n is 4 or 5; M is one or more ligands coordinated to the cobalt by one site; m is 0, 1 or 2; B is a ligand coordinated to the cobalt by two sites; b is 0 or 1, 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 from 0 to 3, to obtain a charge balanced salt; and wherein further said catalyst has a base hydrolysis rate constant of less than 0.23M.sup.-1 s.sup.-1 (25.degree. C.);
- (b) from about 30% to about 99.9% of automatic dishwashing adjunct materials and (c) from about 0.1% to about 10% by weight of the composition of a low foaming nonionic surfactant having a cloud point of a 1% solution in water of below about 32 degrees Celsius;
- wherein a 1% aqueous solution of said automatic dishwashing rinse aid composition has a pH of less than 11.
- 15. A method of washing tableware in a domestic automatic dishwashing appliance, said method comprising treating the soiled tableware during a wash cycle of an automatic dishwasher with an aqueous alkaline bath comprising a source of hydrogen peroxide followed by treating the tableware during the subsequent rinse cycle with an aqueous alkaline bath comprising a cobalt bleach catalyst having the formula:
- �Co(NH.sub.3).sub.n (M).sub.m (B).sub.b !T.sub.y
- wherein cobalt is in the +3 oxidation state, n is 4 or 5; M is one or more ligands coordinated to the cobalt by one site; m is 0, 1 or 2; B is a ligand coordinated to the cobalt by two sites; b is 0 or 1, 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 from 0 to 3, to obtain a charge balanced salt; and wherein further said catalyst has a base hydrolysis rate constant of less than 0.23M.sup.-1 s.sup.-1 (25.degree. C.) and from about 0.1% to about 10% by weight of the composition of a low foaming nonionic surfactant having a cloud point of a 1% solution in water of below about 32 degrees Celsius; wherein a 1% aqueous solution of said aqueous alkaline bath comprising said catalyst has a pH of less than 11.
CROSS REFERENCE TO RELATED APPLICATION
This is a continuation of application Ser. No. 08/795,898, now U.S. Pat. No. 5,705,464, filed on Feb. 6, 1997; which is a continuation of application Ser. No. 08/508,193, filed Jul. 27, 1995, now abandoned; which is a continuation-in-part of application Ser. No. 08/491,462, filed Jun. 16, 1995, now abandoned.
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Continuations (2)
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Number |
Date |
Country |
Parent |
795898 |
Feb 1997 |
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Parent |
508193 |
Jul 1995 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
491462 |
Jun 1995 |
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