Cosmetic compositions comprising a film-forming polymer

Drug – bio-affecting and body treating compositions – Live skin colorant containing

Reexamination Certificate

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C424S059000, C424S064000, C424S070600, C424S070700, C424S070110, C424S401000, C514S844000, C514S845000, C514S938000

Reexamination Certificate

active

06238654

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an emulsion-type composition of viscous consistency, which may be used for care, treatment or makeup of the skin of both the human face and body, of keratin fibers such as the eyelashes, eyebrows and hair, or even of the lips. The composition may be a makeup foundation, a rouge or eye shadow, a concealer, a lip cream, a mascara or a body makeup product, when prepared in colored form, or else a skin-care cream, an after-shampoo, a shampoo, a sunscreen or skin-tanning cream, or even a dermatological ointment, when it is prepared in colorless form.
2. Description of the Background
Thickened care or makeup compositions generally contain a thickening agent which makes it easy to remove the product from the container without loss of product, permitting the product to be distributed homogeneously over the zone to be treated or sufficient quantities of product to be removed in order to achieve the intended cosmetic effect. In this type of composition, the thickening agent can be hydrophilic or lipophilic. When the composition is sufficiently thick, removal of product with the finger leaves hollow portions on the surface of the product in the container and, at the time of subsequent removal, the product surface has remained unchanged, especially at the time of preceding closing of the jar; the cream then appears to be spoiled, causing dissatisfaction with consumers.
Failure of the cream surface to become level after each use occurs, in particular, for a non-flowing cream of rich and/or thick texture.
A need therefore exists for a composition for makeup, treatment or care of the skin and of keratin fibers which achieves good leveling of the surface in its container, giving the impression of opening a new jar on each occasion and of touching an unspoiled product.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a composition containing a physiologically acceptable medium, thickened by an associative polyurethane, where the medium contains a liquid fatty phase and an aqueous phase in the form of an emulsion.
It is another object of the invention is the use of the associative polyurethane in a cosmetic composition of the thickened type and the use of associative polyurethane for the manufacture of a dermatological composition of viscous consistency of the emulsion type, especially in oil-in-water form.
It is another object of the present invention to provide a method of treating skin with the composition.
It is another object of the present invention to provide a method of treating keratin fibers with the composition.
It is another object of the invention to provide a method of preparing such a composition.
Accordingly, the objects of the invention, and others, may be accomplished with a composition suitable for topical application to human skin, in the form of an emulsion, and comprising a liquid fatty phase, an aqueous phase, and an associative polyurethane.
By virtue of the associative polyurethane, the composition may have a thick texture, which spreads easily, is rheofluidizable (the viscosity decreases as shear rate increases), and has significant viscoelasticity.
The objects of the invention may also be accomplished with a method of preparing the composition by combining the liquid fatty phase, the aqueous phase, and the associative polyurethane.
The objects of the invention may also be accomplished with a method of treating skin and/or keratin fibers by applying the composition to the skin and/or the fibers.
Various other objects, features and attendant advantages of the present invention will be more fully appreciated as the same becomes better understood from the following detailed description.
DETAILED DESCRIPTION OF THE INVENTION
The associative polyurethanes are nonionic block copolymers containing in the chain both hydrophilic sequences, which most often are of polyoxyethylene nature, and hydrophobic sequences, which may be aliphatic chains alone and/or cycloaliphatic and/or aromatic chains.
In particular, these polymers contain at least two lipophilic hydrocarbon chains of 6 to 30 carbon atoms, separated by a hydrophilic sequence, the hydrocarbon chains being able to be side chains or chains at the end of hydrophilic groups. In particular, it is possible for one or more side chains to be provided. In addition, the polymer may contain a hydrocarbon chain at one or both ends of a hydrophilic sequences.
The polymers can be sequences having three-block or multi-block form. The hydrophobic sequences can therefore be at each end of the chain (for example: three-block copolymer with hydrophilic central sequence) or distributed both at the ends and in the chain (multisequence copolymer, for example), The polymers may also have a grafted or radiating structure.
Preferably the polymers are three-block copolymers whose hydrophilic sequence is a polyoxyethylene chain containing 50 to 1,000 oxyethylene groups. This range includes all specific values and subranges therebetween, such as 75, 100, 200, 300, 500 and 750 oxyethylene groups.
In general, the associative polyurethanes contain a urethane bond between the hydrophilic sequences, hence the origin of the name of this type of polyurethane polymer. By extension, the associative polyurethanes also include polymers whose hydrophilic sequences are connected by other chemical bonds to the lipophilic sequences.
As an example of associative polymers which may be used in the invention, is the polymer C
16
-OE
120
-C
16
sold by the Huls Co. (under the name Serad FX 1100, a molecule with urethane function and weight-average molecular weight of 1300), OE being an oxyethylene unit. As associative polymer that may also be used is Rheolate 205, with urea function, sold by the Rheox Co., or else Rheolate 208 or 204. These associative polyurethanes are sold in pure form.
The product DW1206B of Rohm & Haas, with a C
20
alkyl chain and urethane bond, sold as 20% dry material in water, may also be used.
There can also be used solutions or dispersions of these polymers, especially in water or in aqueous alcoholic solution. An example of such polymers is Serad FX1010 and Serad 1035 sold by the Huls Co., and Rheolate 255, Rheolate 278 and Rheolate 244 sold by the Rheox Co. The products DW 1206F and DW 1206J as well as Acrysol RM 184 or Acrysol 44 of Rohm & Haas, may also be used.
The polymers which can be used in the invention are in particular those described by G. Fonnum, J. Bakke and Fk. Hansen, Colloid Polym. Sci. 271, 380-389 (1993), incorporated herein by reference.
The composition of the present invention may contain one or more associative polyurethanes in a quantity sufficient to obtain a thickened rheofluidizing composition with a viscosity of 1,000 to 10,000 cp (or 1 to 10 Pa.s), preferably 2,000 to 6,000 cp (or 2 to 6 Pa.s measured at 25° C. with a moving element turning at 100 rpm and, for example, with a Rheomat 115 viscosimeter. These ranges for the viscosity include all specific values and subranges therebetween, such as 1,500, 2,500, 3,000, 5,000, 7,000 and 9,000 cp. In view of obtaining a stable thickened composition, it is advantageous to use at least 5 mg/M
2
and preferably at least 10 mg/M
2
of associative polyurethane per unit of developed surface of oil in water.
The composition according to the invention can be one of oily continuous or external phase or of aqueous continuous phase. It can be a simple oil-in-water or water-in-oil emulsion or a triple or multiple emulsion. The composition may be, in particular, in the form of a cream or ointment. Preferably, the continuous phase is an aqueous phase.
The compositions with aqueous continuous or external phase have the advantage of spreading easily, of being light, of penetrating readily into the skin, of being non-sticky and of endowing the skin with freshness during application, in contrast to compositions of oily continuous phase.
According to the invention, the aqueous phase can contain water, an aqueous alcoholic medium and in particular a polyol-containing medium.

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