Low-irritation antiperspirant and deodorant compositions

A - Human Necessities – 61 – K

Patent

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Details

A61K 31/74 (2006.01)

Patent

CA 2350694

Disclosed are topical compositions which comprise from about 0.01 % to about 60 % by weight of an antiperspirant and/or deodorant active; from about 1 % to about 60 % by weight of a volatile, nonpolar hydrocarbon liquid having a solubility parameter of less than about 7.5 (cal/cm3)0.5 and a vapor pressure as measured at 25 ~C of from about 0.01 mmHg to about 6.0 mmHg; and from about 1 % to about 60 % by weight of a skin irritation-mitigating material having a vapor pressure equal to or less than that of the volatile, nonpolar hydrocarbon liquid, preferably a silicone-containing liquid; wherein the weight ratio of the volatile, nonpolar hydrocarbon liquid to the mitigating material is from about 5:1 to about 1:50. It has been found that the volatile, nonpolar hydrocarbon liquid as defined herein can cause skin irritation when used in an antiperspirant or deodorant composition, when used at relatively low concentrations, but that the skin irritation can be reduced or eliminated by the addition of a skin irritation-mitigating material, provided the material has the requisite vapor pressure and weight ratio relative to the volatile, nonpolar hydrocarbon liquid.

L'invention concerne des compositions topiques renfermant entre 0,01 % et 60 % en poids environ d'un principe actif antisudoral et/ou déodorant; entre 1 % et 60 % en poids environ d'un liquide hydrocarboné volatil non polaire présentant un paramètre de solubilité inférieur à 7,5 (cal/cm?3¿)?0,5¿, ainsi qu'une pression de vapeur qui mesurée à 25 ·C, varie approximativement entre 0,01 mmHg et 6,0 mmHg; et entre 1 % et 60 % en poids environ d'une substance atténuant l'irritation cutanée, la pression de vapeur de cette substance étant inférieure ou égale à celle dudit liquide hydrocarboné volatil non polaire, qui est de préférence un liquide contenant de la silicone. Le rapport pondéral de ce liquide hydrocarboné volatil non polaire à la substance atténuant l'irritation cutanée se situe entre 5:1 et 1:50. De plus, il a été prouvé que ce liquide hydrocarboné volatil non polaire peut irriter la peau s'il est utilisé dans une composition antisudorale ou déodorante, et ce même s'il n'est présent que dans une faible concentration. Il est néanmoins possible de réduire ou d'éliminer toute irritation cutanée grâce à l'ajout d'une substance atténuant l'irritation cutanée, à condition toutefois que cette substance présente une vapeur de pression et un rapport pondéral adéquats par rapport au liquide hydrocarboné volatil non polaire.

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