In-situ generation of zinc pyrithione in personal care compositions
AssigneeArch Chemicals, Inc.
InventorsRahim Hani, George A. Polson
Life of this patent
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Abstract
Disclosed is a personal care composition comprising: (a) water or an alcohol, (b) at least one dispersant or surfactant, and (c) as an antimicrobial or preservative additive, particles of an in-situ transchelation reaction product of a zinc compound selected from the group consisting of zinc salts of organic acids, zinc salts of inorganic acids, zinc hydroxide, zinc oxide, and combinations thereof, said zinc compound being soluble in said water or alcohol, with pyrithione acid or a pyrithione salt that is soluble in said water or alcohol. Also disclosed is a process for preparing the personal care composition, and a coated substrate containing a coating of the personal care composition.
Claims23
A process for preparing a zinc pyrithione-containing personal care composition which comprises in-situ prepared zinc pyrithione, comprising the step of reacting, in a personal care composition comprising at least one surfactant and having a high viscosity relative to zinc pyrithione in water alone, pyrithione acid or a pyrithione salt other than zinc pyrithione, or a combination thereof, with a zinc compound that is soluble in the personal care composition, said zinc compound being selected from the group consisting of zinc salts of organic acids, zinc salts of inorganic acids, zinc hydroxide, zinc oxide, and combinations thereof, thereby causing in-situ transchelation of the pyrithione acid or pyrithione salt with the zinc salt to form said zinc pyrithione-containing personal care composition, wherein said in-situ prepared zinc pyrithione is stable against settling in said personal care composition.
A process for preparing a zinc pyrithione-containing personal care composition selected from the group consisting of shampoo, soap, skin care medicament, and combinations thereof, said process comprising contacting water or an alcohol with at least one surfactant and with a transchelation product produced by reacting pyrithione acid, or a pyrithione salt other than zinc pyrithione that is soluble in the personal care composition, or a combination thereof, with a zinc compound selected from the group consisting of zinc salts of organic acids, zinc salts of inorganic acids, zinc hydroxide, zinc oxide, and combinations thereof, said zinc compound being soluble in the personal care composition, said personal care composition having a high viscosity relative to zinc pyrithione in water alone, and wherein said transchelation product is stable against settling in said personal care composition.
A personal care composition comprising:
- (a) water or an alcohol,
- (b) at least one dispersant or surfactant, and
- (c) as an antimicrobial or preservative additive, particles of an in-situ transchelation reaction product of a zinc compound selected from the group consisting of zinc salts of organic acids, zinc salts of inorganic acids, zinc hydroxide, zinc oxide, and combinations thereof, said zinc compound being soluble in said water or alcohol, with pyrithione acid or a pyrithione salt other than zinc pyrithione that is soluble in said water or alcohol
- wherein said personal care composition has a high viscosity relative to zinc pyrithione in water alone, and wherein said in-situ transchelation reaction product is stable against settling in said personal care composition.
A coated substrate comprising a substrate selected from the group consisting of skin, hair and combinations thereof, and a coating on said substrate, said coating comprising a personal care composition having a high viscosity relative to zinc pyrithione in water alone, and comprising particles of zinc pyrithione and at least one surfactant, said particles being produced by an in-situ transchelation reaction of pyrithione acid or a soluble pyrithione salt other than zinc pyrithione with a zinc compound selected from the group consisting of zinc salts of organic acids, zinc salts of inorganic acids, zinc hydroxide, zinc oxide, and combinations thereof, wherein said zinc pyrithione is stable against settling in said personal care composition.
Dependencies are inferred from the claim text.