Automatic dishwashing compositions comprising cobalt chelated catalysts

• US 6,119,705 A
• Filed: 05/28/1999
• Issued: 09/19/2000
• Est. Priority Date: 02/02/1995
• Status: Expired due to Term

• Current Assignee: The Procter & Gamble Company
• Original Assignee: The Procter & Gamble Company
• Inventors: Scheper, William Michael, Goldstein, Alan Scott, Getty, Edward Eugene
• Primary Examiner(s): DelCotto, Gregory R.
• Application Number:
  US09/322,960
• Time in Patent Office: 480 Days
• Field of Search: 510/220, 510/221, 510/224, 510/372, 510/376, 134/25.2, 252/186.33, 252/186.38
• US Class Current: 134/25.2
• CPC Class Codes: C11D 2111/14 Hard surfaces
• CPC Class Codes: C11D 3/3932 Inorganic compounds or complexes
• CPC Class Codes: C11D 3/3947 Liquid compositions

Abstract

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 chelated catalysts having the formula:

[Co.sub.n L.sub.m X.sub.p ].sup.z Y.sub.z.

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.

Claims

1. 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 a source of hydrogen peroxide and a cobalt catalyst having the formula:

space="preserve" listing-type="equation">[Co.sub.n L.sub.m X.sub.p ].sup.z Y.sub.z

wherein n is an integer from 1 to 4;

m is an integer from 1 to 12;

p is an integer from 0 to 8;

Y is a counterion selected dependent on the charge z of the complex;

X is a coordinating species selected from the group consisting of Cl^-, Br^-, I^-, F^-, NCS^-, I₃, ^- OH, O₂^2-, O^2-, HOO^-, H₂ O, SH, CN^-, OCN^-, S₄^2-, NH₃, NR₃, RCOO^-, RO^- ;

##STR8## RSO₃^- and RSO₄^- in which R is selected from hydrogen, substituted and unsubstituted alkyl, substituted and unsubstituted aryl, and R'"'"'COO^- where R'"'"' is selected from substituted and unsubstituted alkyl and substituted and unsubstituted aryl, and mixtures thereof; and

L is an organic ligand molecule having the general formula ##STR9## wherein R¹ and R² can each be zero, H, substituted and unsubstituted alkyl, substituted and unsubstituted aryl;

each D can be independently N, NR, PR, O, S, wherein R is H, substituted or unsubstituted alkyl, and substituted or unsubstituted aryl;

t and t'"'"' are each independently 2 or 3, and s=2, 3, 4, or 5.

2. A method according to claim 1 wherein the pH of the bath is below 11.

3. 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 comprising:

(a) a catalytically effective amount of a cobalt chelated catalyst having the formula;

space="preserve" listing-type="equation">[Co.sub.n L.sub.m X.sub.p ].sup.z Y.sub.z

wherein n is an integer from 1 to 4;

m is an integer from 1 to 12;

p is an integer from 0 to 8;

Y is a counterion selected dependent on the charge z of the complex;

X is a coordinating species selected from the group consisting of Cl^-, Br^-, I^-, F^-, NCS^-, I₃, ^- OH, O₂^2-, O^2-, HOO^-, H₂ O, SH, CN^-, OCN^-, S₄^2-, NH₃, NR₃, RCOO^-, RO^- ;

##STR10## RSO₃^- and RSO₄^- in which R is selected from hydrogen, substituted and unsubstituted alkyl, substituted and unsubstituted aryl, and R'"'"'COO^- where R'"'"' is selected from substituted and unsubstituted alkyl and substituted and unsubstituted aryl, and mixtures thereof; and

L is an organic ligand molecule having the general formula ##STR11## wherein R¹ and R² can each be zero, H, substituted and unsubstituted alkyl, substituted and unsubstituted aryl;

each D can be independently N, NR, PR, O, S, wherein R is H, substituted or unsubstituted alkyl, and substituted or unsubstituted aryl;

t and t'"'"' are each independently 2 or 3, and s=2, 3, 4, or 5.

(b) an effective amount of a source of hydrogen peroxide; and

(c) automatic dishwashing detergent adjunct materials.

6. A method according to claim 3 comprising automatic dishwashing adjunct material selected such that the composition produces less than 2 inches of suds under normal use conditions.

7. A method according to claim 3 comprising as part or all of the automatic dishwashing adjunct material one or more low foaming nonionic surfactants.

8. A method according to claim 3 comprising as part or all of the automatic dishwashing adjunct material one or more material care agents.

9. A method according to claim 3 comprising as part or all of the automatic dishwashing adjunct material one or more water soluble silicates.

10. A method according to claim 3 comprising as part or all of the automatic dishwashing adjunct material one or more bleach activators.

11. A method according to claim 10 wherein the bleach activator is TAED.

12. A method according to claim 3 having a 1% aqueous solution pH of less than 11.

4. A method for removing tea and/or coffee stains from tableware in a domestic automatic dishwashing appliance, said method comprising treating tea-stained tableware in an automatic dishwasher with an aqueous alkaline bath comprising a source of hydrogen peroxide and the cobalt catalyst of the formula:

space="preserve" listing-type="equation">[Co.sub.n L.sub.m X.sub.p ].sup.z Y.sub.z

wherein n is an integer from 1 to 4;

m is an integer from 1 to 12;

p is an integer from 0 to 8;

Y is a counterion selected dependent on the charge z of the complex;

X is a coordinating species selected from the group consisting of Cl^-, Br^-, I^-, F^-, NCS^-, I₃, ^- OH, O₂^2-, O^2-, HOO^-, H₂ O, SH, CN^-, OCN^-, S₄^2-, NH₃, NR₃, RCOO^-, RO^- ;

##STR12## RSO₃^- and RSO₄^- in which R is selected from hydrogen, substituted and unsubstituted alkyl, substituted and unsubstituted aryl, and R'"'"'COO^- where R'"'"' is selected from substituted and unsubstituted alkyl and substituted and unsubstituted aryl, and mixtures thereof; and

L is an organic ligand molecule having the general formula ##STR13## wherein R¹ and R² can each be zero, H, substituted and unsubstituted alkyl, substituted and unsubstituted aryl;

each D can be independently N, NR, PR, O, S, wherein R is H, substituted or unsubstituted alkyl, and substituted or unsubstituted aryl;

t and t'"'"' are each independently 2 or 3, and s=2, 3, 4, or 5.

5. A method for 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 bath comprising a cobalt catalyst having the formula:

space="preserve" listing-type="equation">[Co.sub.n L.sub.m X.sub.p ].sup.z Y.sub.z

wherein n is an integer from 1 to 4;

m is an integer from 1 to 12;

p is an integer from 0 to 8;

Y is a counterion selected dependent on the charge z of the complex;

X is a

coordinating species selected from the group consisting of Cl^-, Br^-, I^-, F^-, NCS^-, I₃, ^- OH, O₂^2-, O^2-, HOO^-, H₂ O, SH, CN^-, OCN^-, S₄^2-, NH₃, NR₃, RCOO^-, RO^- ;

##STR14## RSO₃^- and RSO₄^- in which R is selected from hydrogen, substituted and unsubstituted alkyl, substituted and unsubstituted aryl, and R'"'"'COO^- where R'"'"' is selected from substituted and unsubstituted alkyl and substituted and unsubstituted 15 aryl, and mixtures thereof; and

L is an organic ligand molecule having the general formula ##STR15## wherein R¹ and R² can each be zero, H, substituted and unsubstituted alkyl, substituted and unsubstituted aryl;

each D can be independently N, NR, PR, O, S, wherein R is H, substituted or unsubstituted alkyl, and substituted or unsubstituted aryl;

t and t'"'"' are each independently 2 or 3, and s =2, 3, 4, or 5.