Solid concentrate compositions containing zinc pyrithione

Patent metadata

Field	Value
Publication number	US-2017191009-A1
Application number	US-201514853558-A
Country	US
Kind code	A1
Filing date	Sep 14, 2015
Priority date	Mar 14, 2013
Publication date	Jul 6, 2017
Grant date	—

Abstract

The present invention relates to a solid concentrate composition comprising: (a) from 5% to 25% by weight of zinc pyrithione (ZPT); (b) from 8% to 85% by weight of at least one surfactant, preferably, wherein the solid concentrate composition has a penetration hardness of between 20 N and 50 N according to the test method as disclosed herein.

First claim

What is claimed is:

1 . A method of forming a bar soap, comprising the steps of:
(a) forming a mixture by diluting a solid concentrate composition with soap, wherein the solid concentrate comprises from 5% to 25% by weight of a zinc pyrithione and from 8% to 85% by weight of at least one surfactant; and (b) shaping the mixture to form a bar soap.

2 . The method according to claim 1 , wherein the solid concentrate composition has a penetration hardness of between 20 N and 50 N according to the test method as disclosed herein.

3 . The method according to claim 1 , wherein the surfactant comprises soap.

4 . The method according to claim 1 , wherein the concentrate comprises from 6% to 8%, by weight of the concentrate, of the zinc pyrithione.

5 . The method according to claim 1 , wherein the concentrate further comprises from 1.4% to 15% by weight of the concentrate of a chelant, wherein the chelant has a log K ZnL of greater than 2, wherein the log K ZnL is the log of a conditional stability constant of the chelant with Zn calculated at pH 7, 25° C., 0.1 M NaCl.

6 . The method according to claim 1 , wherein the concentrate further comprises from 1.4% to 15% by weight of the concentrate of a chelant and wherein the chelant is a metal phosphonate complex comprising one or more phosphonate chelants co-ordinately bonded to one or more metal ions.

7 . The method according to claim 1 , wherein the concentrate further comprises from 1.4% to 15% by weight of the concentrate of a chelant and wherein the chelant is a metal-pyridine oxide complex that is co-ordinately bonded to a metal ion.

8 . The method according to claim 6 , wherein the one or more phosphonate chelants are selected from the group consisting of 2-aminoethyl phosphoric acid, N-phosphonomethyl aminodiacetic acid, 1-hydroxyethane-1,1-diphosphonic acid, amino tris(methylene phosphonic acid), ethylenediamine tetra(methylene phosphonic acid), diethylenetriamine penta(methylene phosphonic acid), phytic acid, nitrilotrimethylene phosphonic acid, and combinations thereof.

9 . The method according to claim 8 , wherein the one or more phosphonate chelants comprise HEDP.

10 . The method according to claim 1 , wherein the concentrate composition has a pH value ranging from 9 to 11 when dispersed in a 1 wt % aqueous solution.

11 . The method according to claim 1 , wherein the mixture further comprises a surfactant selected from the group consisting of primary alcohol sulfates, alpha olefin sulfonates, acyl isethionates, and mixtures thereof.

12 . A method of forming a bar soap, comprising the steps of:
a) combining a soap with a solid concentrate composition, wherein the solid concentrate composition comprises from 5% to 25% by weight of the concentrate of a zinc pyrithione, from 8% to 85% by weight of the concentrate of a second soap, and a chelant; and b) forming the mixture into a bar soap.

13 . The method according to claim 12 , wherein the solid concentrate composition has a penetration hardness of between 20 N and 50 N.

14 . The method according to claim 13 , wherein the chelant comprises from about 3% to about 10%, by weight of the concentrate.

15 . The method according to claim 14 , wherein the solid concentrate further comprises a filler.

16 . The method according to claim 15 , wherein the solid concentrate further comprises an inorganic salt.

17 . A method of forming a bar soap, comprising:
a) combining a soap with a concentrate composition to form a mixture, wherein the concentrate composition comprises:
i) from about 5% to about 25%, by weight of the concentrate, of a zinc pyrithione,
ii) from about 8% to about 85%, by weight of the concentrate, of a second soap,
iii) a chelant;
iv) a zinc salt; and
v) a filler; and
b) forming the mixture into a bar soap.

18 . The method of claim 17 , wherein the chelant comprises a metal-pyridine oxide complex or a metal phosphonate complex.

19 . The method of claim 18 , where the zinc salt is selected from the group consisting of zinc carbonate, zinc sulfate, zinc nitrate, zinc fluoride, zinc chloride, zinc borate, zinc oxide, and a combination thereof.

20 . The method of claim 19 , wherein the filler comprises talc.

Assignees

• Procter & Gamble

Inventors

• Salvador Charlie Reyes
• Jiang Chunpeng
• Sun Yanan
• Liu Zhe
• Showole Gbenga Segun
• Makrandi Anurag
• Nicdao Raul Songco

Classifications

• A61K2800/58

  Metal complex; Coordination compounds · CPC title

• C11D9/32

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

• A61K8/27

  Zinc; Compounds thereof · CPC title

• C11D1/146

  Sulfuric acid esters · CPC title

• C11D3/48

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