Antiperspirant Compositions
Compositions containing a relatively high concentration of electrolytes and a thickening agent, wherein the thickening agent comprises a strongly swellable, lightly to moderately crosslinked polyvinyl pyrrolidone. The polyvinyl pyrrolidone thickening agent is characterized by an aqueous gel volume of about 15 to 150 ml/g and a Brookfield viscosity of at least 10,000 cps for a 5% aqueous solution at 25° C.
1 . A composition comprising:
at least one active ingredient selected from the group consisting of an antiperspirant active and a deodorant active; and
a thickening agent, wherein the thickening agent comprises a strongly swellable, lightly to moderately crosslinked polyvinyl pyrrolidone.
2 . A composition according to claim 1 wherein the concentration of the active ingredient is 5% or more.
3 . A composition according to claim 1 wherein the thickening agent is characterized by an aqueous gel volume of about 15 to 150 ml/g of polymer and a Brookfield viscosity of at least 10,000 cps for a 5% aqueous solution at 25° C.
4 . A composition according to claim 1 wherein the active ingredient is an active antiperspirant active.
5 . A composition according to claim 4 wherein said active antiperspirant ingredient is an aluminum, zirconium, or zinc salt, or mixtures thereof.
6 . A composition according to claim 5 wherein said antiperspirant ingredient is selected from the group consisting of activated aluminum chlorohydrate, degraded activated aluminum chlorohydrate, aluminum chlorohydrate, aluminum zirconium tetrachlorohydrex glycine, and mixtures thereof.
7 . A composition according to claim 1 wherein the composition is in the form of a gel or oil-in-water emulsion.
8 . A composition according to claim 7 wherein the composition maintains a viscosity at least as high as the initial viscosity of the composition over a period of three months when stored at 45° C.
9 . A composition comprising a relatively high concentration of electrolytes and a thickening agent, wherein the thickening agent comprises a strongly swellable, lightly to moderately crosslinked polyvinyl pyrrolidone.
10 . The composition of claim 9 wherein the concentration of the electrolytes is 5% or more.
11 . The composition of claim 9 wherein the thickening agent is characterized by an aqueous gel volume of about 15 to 150 ml/g of polymer and a Brookfield viscosity of at least 10,000 cps for a 5% aqueous solution at 25° C.
12 . The composition of claim 11 wherein the electrolytes comprise antiperspirant actives.
13 . The composition of claim 12 wherein the concentration of the antiperspirant actives is 5% or more.
14 . A method of producing a stable antiperspirant composition comprising:
adding a thickening agent comprising a strongly swellable, lightly to moderately crosslinked polyvinyl pyrrolidone to a base composition containing an antiperspirant active ingredient.
15 . The method of claim 14 wherein the thickening agent is characterized by an aqueous gel volume of about 15 to 150 ml/g of polymer and a Brookfield viscosity of at least 10,000 cps for a 5% aqueous solution at 25° C.