Cosmetic liquid extractor comprising nonionic polymers
View Patent ↗Aqueous liquid compositions are provided, which comprise nonionic polymers, such as polyvinyl alcohol (PVA), polyvinylpyrrolidone (PVP), or combinations thereof, and which are free of or substantially free of salt-forming groups. The aqueous liquids form solid, flexible films after direct application to skin, and the films may be peeled from the skin to remove adhered keratotic plugs from pores of the skin. The compositions are easily applied to skin, without dripping, with fingers, a brush, or other applicators.
1. A method for removing keratotic plugs from pores of human skin comprising:
applying to skin in need thereof, a film of liquid composition comprising an aqueous solution or dispersion comprising from more than 10% to about 20% by weight polyvinyl alcohol (PVA), wherein said PVA comprises a low viscosity PVA having a viscosity from about 1.0 to 20 cps and a high viscosity PVA having a viscosity from about 20 and about 100 cps said viscosities as determined in a 4% aqueous solution at 20° C.; wherein said PVA is derived from hydrolysis of polyvinyl acetate and has a degree of hydrolysis from about 85% to about 95%; and from about 5% to about 15% by weight polyvinylpyrrolidone (PVP), said liquid composition being substantially free of polymers having salt-forming groups, wherein said liquid composition has a viscosity from about 25,000 cps to about 200,000 cps; and
allowing an amount of water to evaporate from said film of said liquid composition on the skin such that a flexible, solid film is formed on the surface of the skin, said flexible, solid film being adherent to keratotic plugs;
peeling said flexible, solid film from the skin so that keratotic plugs adherent thereto are removed from the pores.
2. The method according to claim 1 , wherein the liquid composition further comprises one or more skin benefiting agents selected from the group consisting of salicylic acid, glycolic acid, thiodipropionic acid, and mixtures thereof.
3. The method according to claim 2 , wherein the one or more skin benefiting agents is salicylic acid.
4. The method according to claim 1 , wherein said liquid composition comprises from about 12.5% to about 17.5% PVA by weight and from about 7.5% to about 12.5% PVP by weight.
5. The method according to claim 1 , wherein said liquid composition further comprises from about 0.1% to about 10% by weight of an ethanol co-solvent.
6. The method according to claim 1 , wherein said liquid composition comprises from about 65% to about 85% by weight water.