Dual Phase Cosmetic Composition

Abstract

The present invention relates to a method of formulating a liquid dual phase cosmetic or pharmaceutical composition in which the phases are separate before and after being mixed, the method comprising combining an aqueous phase and an oil phase, wherein one of the aqueous and oil phases has incorporated therein, as a demixing agent, an effective amount of a non-cationic film forming agent such as polyvinylpyrrolidone and copolymers thereof. The compositions of the invention are particularly useful as makeup removers.

1 . A method of formulating a dual phase liquid cosmetic or pharmaceutical composition in which the phases are separate before and after being mixed, the method comprising combining an aqueous phase and an oil phase, wherein one of the aqueous and oil phases has incorporated therein, as a demixing agent, an effective amount of a non-cationic film forming agent. 
   
   
       2 . The method of  claim 1 , in which, after being mixed, the phases separate completely upon resting within about 5 to 20 minutes. 
   
   
       3 . The method of  claim 1  in which the film forming agent is selected from the group consisting of polyvinylpyrrolidone and copolymers thereof. 
   
   
       4 . The method of  claim 3  wherein the film forming agent is selected from the group consisting of polyvinylpyrrolidone hexadecene copolymer, polyvinylpyrrolidone eicosene copolymer and polyvinylpyrrolidone 1-triacontene copolymer. 
   
   
       5 . The method of  claim 4  wherein the film forming agent is polyvinylpyrrolidone hexadecene copolymer. 
   
   
       6 . The method of  claim 1  in which the demixing agent is present in an amount of from about 0.001 to about 10 percent by weight of the total composition. 
   
   
       7 . The method of  claim 6  in which the demixing agent is present in an amount of from about 0.01 to about 1 percent by weight of the total composition. 
   
   
       8 . The method of  claim 1  in which the oil phase and aqueous phase are present in a ratio of from about 30:70 to about 70:30, by weight of the total composition. 
   
   
       9 . The method of  claim 8  in which the aqueous phase and oil phase are present in a ratio of from about 40:60 to about 60:40, by weight of the total composition. 
   
   
       10 . The method of  claim 1  in which the oil phase contains a combination of volatile and non-volatile oils. 
   
   
       11 . The method of  claim 10  in which the amount of volatile oil is about 30 to about 70 percent by weight of the total composition and the amount of non-volatile oil is about 0.1 to about 10 percent by weight of the total composition. 
   
   
       12 . The method of  claim 10  in which the volatile oil is a volatile hydrocarbon. 
   
   
       13 . The method of  claim 12  in which the volatile hydrocarbon is isododecane, isohexadecane, or a combination thereof. 
   
   
       14 . The method of  claim 11  in which the volatile oil comprises both a volatile silicone and a volatile isoparaffin. 
   
   
       15 . The method of  claim 14  in which the volatile silicone is cyclomethicone and the volatile isoparaffin is a C 16  isoparaffin. 
   
   
       16 . The method of  claim 10  in which the non-volatile oil comprises a non-volatile silicone. 
   
   
       17 . The method of  claim 16  in which the non-volatile silicone is dimethicone. 
   
   
       18 . The method of  claim 16  which comprises a cyclic silicone present in an amount of about 25 to about 40 percent by weight of the total composition, a C 16  isoparaffin present in an amount of about 15 to about 30 percent by weight of the total composition, and a non-volatile silicone present in an amount of about 0.1 to about 1 percent by weight of the total composition. 
   
   
       19 . The method of  claim 18  in which the cyclic silicone is cyclomethicone, the isoparaffin is isohexadecane, and the non-volatile silicone is dimethicone. 
   
   
       20 . The method of  claim 19  which comprises a surfactant in an amount of no greater than about 5 percent by weight of the total composition. 
   
   
       21 . The method of  claim 20  in which the surfactant is present in an amount of from about 0.1 to about 1 percent by weight of the total composition. 
   
   
       22 . The method of  claim 1  in which the composition is a makeup removal composition.