Self-Leveling Cosmetic
Cosmetic compositions comprising a Boger fluid are provided as well as methods for using such compositions in cosmetics that exhibit Boger fluid-like characteristics, such as self-leveling. These cosmetics provide for ease of application and aid in achieving a smooth, even, and/or glossy finish on skin and hair.
1 . A method for applying a smooth cosmetic film to eyelashes, comprising:
forming an initial coating on said eyelashes with a composition comprising by weight of the composition from about 0.01 to about 30% by weight of an associative thickener capable of forming a film on the shaft of a keratin fiber; and allowing the coating to self-level to provide a coating having reduced clumping and a smoother surface as compared to said initial coating;
wherein said associative thickener comprises a polyurethane polymer resulting from the reaction of a mixture comprising (i) a polyether polyol component having an average molecular weight between about 500 and about 20,000 g/mol, (ii) a diisocyanate, (iii) a branched, aliphatic C 8-36 primary alcohol, and (iv) optionally a modifier comprising two groups reactive with said diisocyante and a hydrophobic moiety.
2 . The method according to claim 1 wherein said polyurethane polymer comprises polyether urea polyurethane polymer.
3 . The method according to claim 1 wherein said composition further comprises less than 0.1% alcohol by weight.
4 . The method according to claim 1 wherein said composition further comprises a wax.
5 . The method according to claim wherein said composition further comprises an aqueous vehicle.
6 . The method according to claim 5 wherein said aqueous vehicle comprises propylene glycol.
7 . The method according to claim 1 wherein said composition comprises further an oil-in-water or a water-in-oil emulsion.
8 . (canceled)
9 . The method according to claim 1 wherein said polymer is in an amount from about 0.01 to about 10% by weight based on the total weight of the composition.
10 . The method according to claim 1 wherein said composition is a mascara.
11 . A method for imparting a self-leveling property to a mascara composition, comprising:
formulating said mascara to comprise an associative thickener comprising by weight of the mascara composition from about 0.01 to about 30% by weight of a polyurethane polymer resulting from the reaction of a mixture comprising (i) a polyether polyol component having an average molecular weight between about 500 and about 20,000 g/mol, (ii) a diisocyanate, (iii) a branched, aliphatic C 8-36 primary alcohol, and (iv) optionally a modifier comprising two groups reactive with said diisocyante and a hydrophobic moiety; and
said mascara containing an amount of alcohol such that the mascara is a near alcohol-free composition;
wherein said polyurethane polymer is added in an amount effective to maintain a constant or near constant viscosity of said near alcohol-free composition over a plurality of shear rates.
11 . The method according to claim 10 wherein said polyurethane polymer comprises a polyether urea polyurethane polymer.
13 . (canceled)
14 . The method according to claim 10 wherein said polymer is in an amount from 2 weight % to 10 weight % based on the total weight of said composition.
15 . The method according to claim 11 wherein said mascara further comprises a wax.
16 . The method according to claim 11 wherein said composition comprises an oil-in-water or a water-in-oil emulsion, and wherein said aqueous emulsion comprises propylene glycol.
17 . (canceled)
18 . A method of manufacturing a cosmetic composition comprising incorporating into said cosmetic composition a dispersion in an aqueous polyol of a polyurethane polymer resulting from the reaction of a mixture comprising (i) a polyether polyol component having an average molecular weight between about 500 and about 20,000 g/mol, (ii) a diisocyanate, (iii) a branched, aliphatic C8-36 primary alcohol, and (iv) optionally a modifier comprising two groups reactive with said diisocyanate and a hydrophobic moiety.
19 . The method according to claim 13 , wherein said dispersion comprises from about 10% to about 60% by weight water, from about 10% to about 40% by weight polyurethane polymer, and from about 10% to about 70% by weight polyol.
20 . The method according to claim 14 , wherein said polyol is selected from glycerin or a C 3-8 glycol, or combinations thereof.
21 . The method according to claim 15 , wherein said polyol comprises propylene.
22 . The method according to claim 14 , wherein said dispersion comprises about 15% by weight water, about 30% by weight polyurethane polymer, and about 55% by weight propylene glycol.
23 . The method according to claim 14 , wherein said dispersion comprises about 40% by weight water, about 20% by weight polyurethane polymer, and about 10% by weight propylene glycol.