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US 10,450,537 B2Granted
Solid concentrate compositions containing zinc pyrithione
AssigneeThe Procter & Gamble Company
InventorsCharlie Reyes Salvador, Chunpeng Jiang, Yanan Sun, Zhe Liu, Gbenga Segun Showole, Anurag Makrandi, Raul Songco Nicdao
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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.
Claims6
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;
- wherein the solid concentrate composition has a penetration hardness of between 20 N and 50 N according to the test method as disclosed herein;
- wherein the surfactant comprises soap;
- wherein the concentrate comprises from 6% to 8%, by weight of the concentrate, of the zinc pyrithione;
- wherein the concentrate further comprises from 1.4% to 15% by weight of the concentrate of a chelant, wherein the chelant has a log KZnl of greater than 2, wherein the log KZnL is the log of a conditional stability constant of the chelant with Zn calculated at pH 7, 25° C., 0.1 M NaCl;
- and
- 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.
6 more elements
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;
- wherein the chelant comprises a metal-pyridine oxide complex or a metal phosphonate complex and 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.
7 more elements
Dependencies are inferred from the claim text.