Aqueous composition containing oligodynamic metal

• US 10,093,885 B2
• Filed: 01/26/2015
• Issued: 10/09/2018
• Est. Priority Date: 01/29/2014
• Status: Active Grant

• Current Assignee: Conopco (Unilever PLC)
• Original Assignee: Conopco (Unilever PLC)
• Inventors: Agarkhed, Ajit Manohar, Kumar, Nitish
• Primary Examiner(s): OGDEN JR, NECHOLUS
• Application Number:
  US15/114,100
• Publication Number:
  US 20160348034A1
• Time in Patent Office: 1,352 Days
• Field of Search: None
• CPC Class Codes: C11D 3/044 Hydroxides or bases
• CPC Class Codes: C11D 3/1206 free metals, e.g. aluminium grit or flakes
• CPC Class Codes: C11D 3/1213 Oxides or hydroxides, e.g. Al2O3, TiO2, CaO or Ca(OH)2
• CPC Class Codes: C11D 3/2075 Carboxylic acids-salts thereof
• CPC Class Codes: C11D 3/30 Amines; Substituted amines ; Quaternized amines
• CPC Class Codes: C11D 3/33 Amino carboxylic acids
• CPC Class Codes: C11D 3/48 Medical, disinfecting agents, disinfecting, antibacterial, germicidal or antimicrobial compositions
• CPC Class Codes: C11D 7/06 Hydroxides
• CPC Class Codes: C11D 7/20 Water-insoluble oxides
• CPC Class Codes: C11D 7/265 Carboxylic acids or salts thereof
• CPC Class Codes: C11D 7/3245 Aminoacids
• CPC Class Codes: C11D 9/18 Water-insoluble compounds
• CPC Class Codes: C11D 9/28 containing halogen C11D9/225 takes precedence
• CPC Class Codes: C11D 9/30 containing nitrogen C11D9/225 takes precedence

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.

Claims

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 %.