Method for indicating time for washing or indicating delivery of antibacterial agent

Patent metadata

Field	Value
Publication number	US-10494589-B2
Application number	US-201313944208-A
Country	US
Kind code	B2
Filing date	Jul 17, 2013
Priority date	Dec 19, 2012
Publication date	Dec 3, 2019
Grant date	Dec 3, 2019

Abstract

A method for indicating release of an antibacterial agent or for indicating an amount of time for cleansing skin with an aqueous cleansing composition comprising a surfactant and a zinc X halide complex, wherein X is an amino acid or trimethylglycine, wherein the method comprises washing skin with the cleansing composition and water for a time until the zinc X halide complex precipitates from the aqueous cleansing composition.

First claim

The invention claimed is:

1. A method for cleansing skin
which comprises washing skin with a liquid hand soap or body wash which provides a visual indicator of completion of the washing process and applies a zinc oxide sunscreen layer to the skin, wherein the liquid hand soap or body wash comprises a composition comprising a surfactant and a zinc X halide complex, wherein the zinc X halide complex is a zinc-lysine complex having the formula [Zn(C 6 H 14 N 2 O 2 ) 2 Cl] + Cl − , and
wherein when the skin is washed with the liquid hand soap or body wash and water for a sufficient amount of time the zinc X halide complex precipitates from the liquid hand soap or body wash; and
wherein the precipitate provides a visually observable zinc oxide precipitate which forms upon increase in a dilution with water; and
wherein the presence of the visually observable precipitate indicates to an individual that they have washed their skin for a sufficient amount of time.

2. The method of claim 1 , wherein a total amount of zinc present in the composition is 0.05 to 8% by weight.

3. The method of claim 1 , wherein the zinc X halide complex is formed from a mixture of zinc oxide and lysine hydrochloride, optionally in a molar ratio of ZnO:Lysine.HCl of from 2:1 to 1:3, optionally about 1:2.

4. The method of claim 1 , wherein the zinc X halide complex is made by combining zinc oxide with an amino acid hydrohalide.

5. The method of claim 1 , wherein the zinc X halide complex is made by combining tetrabasic zinc chloride with an amino acid hydrohalide.

6. The method of claim 1 , wherein the total amount of zinc present in the composition is 0.1 to 2% by weight of the composition.

7. The method of claim 1 , wherein the surfactant comprises one or more non-ionic surfactants selected from amine oxide surfactants, alcohol amide surfactants, polyethoxylated surfactants, and combinations thereof.

8. The method of claim 1 , wherein the composition is free of anionic surfactants.

9. The method of claim 1 , wherein the time is 10 seconds to 60 seconds, optionally, 10 to 30 seconds, 10 to 20 seconds, or 15 to 20 seconds.

10. The method of claim 1 , wherein the precipitate is a zinc salt and the zinc salt adheres to the skin and protects the skin from sun damage prior to exposure to the sun.

11. The method according to claim 1 , wherein the composition is anhydrous.

Assignees

• Colgate Palmolive Co

Inventors

• Pan Long
• Yuan Shaotang
• Mattai Jairajh
• Masters James G

Classifications

• A61K8/44

  Aminocarboxylic acids or derivatives thereof, e.g. aminocarboxylic acids containing sulfur; Salts; Esters or N-acylated derivatives thereof · CPC title

• C11D3/168 Primary

  Organometallic compounds or orgometallic complexes · CPC title

• A61K2800/45

  Colour indicators, e.g. pH- or Redox indicators · CPC title

• C11D17/08

  Liquid soap, {e.g. for dispensers}; capsuled · CPC title

• A61K8/27

  Zinc; Compounds thereof · CPC title