Aqueous composition containing oligodynamic metal

Patent metadata

Field	Value
Publication number	US-10093885-B2
Application number	US-201515114100-A
Country	US
Kind code	B2
Filing date	Jan 26, 2015
Priority date	Jan 29, 2014
Publication date	Oct 9, 2018
Grant date	Oct 9, 2018

Abstract

Disclosed is an aqueous composition having viscosity from 1 to 100 cP at 20° C., said composition comprising: (i) an oligodynamic metal or ions thereof; (ii) a chelating agent; and, (iii) free alkali less than 1 wt %, wherein said composition comprises 0.01 wt % to 2 wt % of a salt of an organic acid; pH of the composition is from 9 to 12 and molar ratio of said oligodynamic metal to said chelating agent is 1:0.25 to 1:10. The composition provides a robust solution for technical problems of discoloration and instability.

First claim

The invention claimed is:

1. An aqueous composition having viscosity from 1 to 100 cP at 20° C., said composition comprising:
(i) an oligodynamic metal or ions thereof;
(ii) a chelating agent; and,
(iii) free alkali less than 1 wt %,
wherein said composition comprises 0.01 wt % to 2 wt % of a salt of an organic acid; pH of the composition is from 9 to 12 and molar ratio of said oligodynamic metal to said chelating agent is 1:0.25 to 1:10;
wherein said composition comprises 3% by wt. or less surfactant.

2. A composition as claimed in claim 1 wherein the Red component at the LOVIBOND RYBN colour scale of said composition is not more than 10.

3. A composition as claimed in claim 1 comprising 0.001 to 10 wt % of said oligodynamic metal or ions thereof.

4. A composition as claimed in claim 1 wherein said oligodynamic metal is Silver, Copper, Zinc or Gold.

5. A composition as claimed in claim 4 wherein said metal is Silver.

6. A composition as claimed in claim 1 wherein said chelating agent is selected from ethylene diamine tetraacetic acid (EDTA), ethylene diamine dissuccinate (EDDS), N,N-bis(carboxymethyl) glutamic acid (GLDA), Diethylenetriaminepentaacetic acid (DTPA), Nitrilotriacetic acid (NTA) or Ethanoldiglycinic acid ((EDG).

7. A composition as claimed in claim 1 wherein molar ratio of said metal to said salt of organic acid is 1:0.05 to 1:5.

8. A process for preparing an aqueous composition as claimed in claim 1 comprising the steps of:
(i) heating an aqueous mixture comprising a chelating agent and a compound of a metal having oligodynamic property to 30° C. to 85° C.; and,
(ii) adding an organic acid to said aqueous mixture to bring the free alkali content of said composition, measured as NaOH, to less than 1 wt %.

9. An aqueous composition as claimed in claim 1 obtainable by the steps of:
(i) heating an aqueous mixture comprising a chelating agent and a compound of a metal having oligodynamic property to 35° C. to 85° C.; and,
(ii) adding an organic acid to said aqueous mixture to bring the free alkali content of said composition, measured as NaOH, to less than 1 wt %.

Assignees

• Conopco Inc

Inventors

• Agarkhed Ajit Manohar
• Kumar Nitish

Classifications

• C11D7/06

  Hydroxides · CPC title

• C11D3/1213 Primary

  Oxides or hydroxides, e.g. Al2O3, TiO2, CaO or Ca(OH)2 · CPC title

• C11D3/2075

  Carboxylic acids-salts thereof · CPC title

• C11D3/48

  Medical, disinfecting agents, disinfecting, antibacterial, germicidal or antimicrobial compositions · CPC title

• C11D9/30

  containing nitrogen {(C11D9/225 takes precedence)} · CPC title