CLEANING METHOD

• US 20090090387A1
• Filed: 03/20/2007
• Published: 04/09/2009
• Est. Priority Date: 03/21/2006
• Status: Abandoned Application

• Current Assignee: The Procter & Gamble Company
• Original Assignee: Illinois Institute of Technology, The Procter & Gamble Company
• Inventors: Ding, Yulong, York, David W., Massey Brooker, Anju D., Somerville Roberts, Nigel Patrick, Wasan, Darsh T., Nikolov, Alex D.
• Application Number:
  US12/282,219
• Publication Number:
  US 20090090387A1
• Time in Patent Office: Days
• US Class Current: 134/7
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: C11D 11/0023 "Hard" surfaces
• CPC Class Codes: C11D 2111/14 Hard surfaces
• CPC Class Codes: C11D 3/1213 Oxides or hydroxides, e.g. Al2O3, TiO2, CaO or Ca(OH)2
• CPC Class Codes: C11D 7/20 Water-insoluble oxides

Abstract

Methods of removing cooked-, baked-, or burnt-on food soil from cookware and tableware comprising washing the cookware/tableware in an automatic dishwashing machine in the presence of a wash liquor comprising nanoparticles is disclosed herein.

Claims

1. A method of removing cooked-, baked-, or burnt-on food soil from cookware and tableware comprising washing the cookware/tableware in an automatic dishwashing machine in the presence of a wash liquor comprising nanoparticles.

2. A method according to claim 1 wherein the nanoparticles have a weight mean particle size of less than about 100 nm.

3. A method according to claim 1 wherein the concentration of the nanoparticles in the wash liquor is from about 0.1 to about 5% by weight of the wash liquor.

4. A method according to claim 1 wherein the wash liquor further comprises a steric dispersant.

5. A method according to claim 1 wherein the pH of the wash liquor, as measured at 20°

C., is at least about 9.

6. A method according to claim 1 wherein the nanoparticles are selected from metal oxides.

7. A method according to claim 6 wherein the nanoparticles are selected from titanium dioxide, zinc oxide, cerium oxide and mixtures thereof.

8. A method according to claim 1 wherein nanoparticles are delivered into the wash liquor during the pre-wash, main wash or rinse cycle.

9. A method according to any preceding claim wherein the soil is scrambled eggs.

10. A method according to claim 1 wherein the method further comprises the simultaneous or separate delivery of bleach into the wash liquor.

11. A method according to claim 1 wherein the method further comprises the simultaneous or separate delivery of enzymes into the wash liquor.