Aqueous emulsion based antiperspirant formulation

A method of inhibiting perspiration, comprising:

• providing water;
• providing an antiperspirant aluminum salt;
• selecting a sweat repellent polymer, wherein the sweat repellent polymer is selected to have a sweat contact angle of ≥30° and wherein the sweat repellent polymer comprises a multistage polymer comprising:
• (a) an acrylate rich stage comprising:
• 38 to <100 wt %, based on weight of the acrylate rich stage, of structural units of a monoethylenically unsaturated nonionic acrylate rich stage monomer, wherein the monoethylenically unsaturated nonionic acrylate rich stage monomer is selected from the group consisting of C1-22 alkyl (meth)acrylates and mixtures thereof;
• >0 to 50 wt %, based on weight of the acrylate rich stage, of structural units of a first carbosiloxane monomer of formula (I)
• wherein a is 1;
• wherein d is 0;
• wherein each R1 is independently selected from the group consisting of a hydrogen, a C1-10 alkyl group and an aryl group;
• wherein each R2 is independently selected from the group consisting of a hydrogen and a C1-10 alkyl group;
• wherein each R8 is a —O—Si(CH3)3 group;
• wherein Y is selected from the group consisting of formulas (II), (III) and (IV)
• wherein each R4 and R6 are independently selected from the group consisting of a hydrogen and a methyl group;
• wherein each R3 and R5 are independently a C1-10 alkylene group;
• wherein each R7 is independently a C1-10 alkyl group;
• wherein b is 0 to 4;
• wherein c is 0 or 1;
• 0 to 10 wt %, based on weight of the acrylate rich stage, of structural units of a monoethylenically unsaturated carboxylic acid acrylate rich stage monomer;
• and
• 0 to 2 wt %, based on weight of the acrylate rich stage, of structural units of a multiethylenically unsaturated acrylate rich stage monomer having at least two ethylenically unsaturated groups per molecule;
• and
• (b) a carbosiloxane rich stage, comprising:
• 0 to 90 wt %, based on weight of the carbosiloxane rich stage, of structural units of a vinyl monomer;
• and
• 10 to 100 wt %, based on weight of the carbosiloxane rich stage, of structural units of a second carbosiloxane monomer of formula (I);
• wherein the first carbosiloxane monomer of formula (I) and the second carbosiloxane monomer of formula (I) are the same or different;
• and
• providing the selected sweat repellent polymer;
• combining the water, the antiperspirant aluminum salt and the selected sweat repellent polymer to form an aqueous antiperspirant composition;
• wherein the aqueous antiperspirant composition is an emulsion;
• and
• applying the aqueous antiperspirant composition on skin to form a film.