Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
1999-10-29
2001-03-27
Kishore, Gollamudi S. (Department: 1615)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S070100, C424S070110, C424S070160, C424S062000, C424S063000, C514S844000, C514S845000, C514S846000
Reexamination Certificate
active
06207175
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a cosmetic and/or dermatological lotion comprising an aqueous phase and a powdered phase, the powdered phase comprising at least one active powder and hollow particles based on at least one acrylic or methacrylic polymer or copolymer, and the use of the said lotion in caring for, cleaning, removing make-up from and/or coloring the skin, mucous membranes and/or scalp.
The present invention also relates to the use of hollow particles based on at least one acrylic or methacrylic polymer or copolymer in a cosmetic and/or dermatological lotion comprising an aqueous phase and a powdered phase comprising at least one active powder for preventing the powdered phase from becoming clogged and for conferring, on the lotion, softness on application on the skin, mucous membranes and/or scalp.
2. Discussion of the Background
Cleaning of the skin is very important in caring for the face. Cleaning should be as effective as possible because fatty residues, such as excess sebum, residues from cosmetic and/or dermatological products used daily and make-up products, in particular waterproof products, accumulate in the skin folds and at the surface of the skin and can block the pores of the skin and lead to the appearance of spots. Poor quality cleaning or make-up removal is often responsible, among other causative factors, for a muddy complexion.
The use is known, in the field of caring for, cleaning and removing make-up from human skin, of powdered lotions or tonics, that is to say compositions comprising two phases: an aqueous phase, optionally with alcohol added, and a phase composed of an active powder, that is to say a powder which is effective with regard to the skin, for example in terms of removing sebum or of having a mattifying effect. In the bottle, these two phases are separated when the product is at rest and they must be mixed at the time of use by agitating. After standing for a few hours, they again separate into two phases, resuming their original condition.
JP 9-48721 discloses a lotion comprising an aqueous/ethanolic phase and a porous or water-absorbing powder, such as starch powder or silicic acid anhydride powder. These lotions can be us ed to remove excess sebum from the skin and to absorb dirt.
However, the use of a powdered lotion may have disadvantages. This is because the separation by settling after use is often lengthy and incomplete, the consequence of which is that the aqueous or aqueous/alcoholic phase is not clear and therefore has an appearance which causes a potential user to reject the product. In addition, the powdered phase has a tendency to become clogged at the bottom of the bottle and t o form a “cake”, which often makes it difficult to resuspend the powder during use.
The addition of silica is known in order to limit this clogging effect. However, the addition of silica has the disadvantage of giving a rough nature to the lotion, which is unpleasant for the user.
The need therefore remains for a powdered lotion which does not have the disadvantages of the compositions described above and which in, particular, has a powdered phase which does not become clogged, while being soft on application.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a powdered lotion. It is another object of the invention to provide a powdered lotion which does not suffer from the clogging disadvantages described above.
It is another object of the invention to provide a powdered lotion which may be used for caring for, cleaning, removing make-up from and/or coloring the skin, mucous membranes and/or scalp.
The present inventors have found, surprisingly, that the addition of hollow particles based on at least one acrylic or methacrylic polymer or copolymer to powdered lotions makes it possible to avoid the phenomenon of clogging while giving great softness on application to the lotion.
Accordingly, the objects of the invention, and others, may be accomplished with a lotion composition suitable for cosmetic and/or dermatological use, comprising:
90 to 99.99% by weight, with respect to the total weight of the lotion, of an aqueous phase; and
a powdered phase comprising at least one active powder and hollow particles comprised of at least one acrylic or methacrylic polymer or copolymer.
The phrase “aqueous phase” is understood to mean, in the lotion of the present invention, the liquid phase of the lotion, whether it is strictly aqueous or aqueous/alcoholic, as opposed to the powdered phase.
The inventive lotion has the advantage of exhibiting a powdered phase which does not become clogged and it makes possible a smooth treatment of the skin, mucous membranes and/or scalp.
The objects of the invention may also be accomplished with a method of caring for, cleaning, removing make-up from and/or coloring the skin, mucous membranes and/or scalp, comprising applying the inventive lotion composition to the skin, mucous membranes and/or scalp.
The objects of the invention may also be accomplished with a method of preventing the powdered phase of a lotion suitable for cosmetic and/or dermatological use, wherein the lotion comprises an aqueous phase and a powdered phase, from becoming clogged and for conferring, on the lotion, softness during application to the skin, mucous membranes and/or scalp, comprising incorporating into the lotion hollow particles comprised of least one acrylic or methacrylic polymer or copolymer.
A more complete appreciation of the invention and many of the attendant advantages thereof will be readily obtained as the same becomes better understood by reference to the following detailed description.
DETAILED DESCRIPTION OF THE INVENTION
In the context of the present invention, the word “lotion” means that the composition is liquid and therefore has a viscosity of less than 0.1 Pa·s (100 centipoises), preferably of less than 0.06 Pa·s (60 centipoises), this viscosity being measured at 25° C. with a Contraves Rheomat 108/ER device. In a particularly preferred embodiment, the lotion of the invention comprises solely an aqueous phase and a powdered phase and is therefore devoid of oils.
The lotion according to the invention is intended for a topical application and therefore comprises a physiologically acceptable medium, that is to say compatible with the skin, mucous membranes and/or scalp.
The amount of powdered phase in the lotion according to the invention may range from 0.01 to 10%, preferably from 0.2 to 8%, by weight with respect to the total weight of the lotion. These ranges include all specific values and subranges therebetween, such as 0.05, 0.1, 0.5, 1, 2, 3 and 5% by weight.
The active powder of the lotion according to the invention can be chosen from any powder commonly used in powdered lotions and which is particularly active in caring for, removing make-up from, cleaning and/or coloring the skin, mucous membranes and/or scalp. It can be, for example, a mattifying, cleaning, make-up removing, coloring, astringent, antibacterial and/or protective powder (for example, UV protection).
Examples of the active powder include, for example, kaolin, zinc oxide, polyethylene powders, polyamide powders and in particular the Nylon powders listed under the CTFA name (“International Cosmetic Ingredient Dictionary and Handbook”) of “Nylon 12” or “Nylon 6”, such as, for example, those sold under the name “Orgasol” by the Company Atochem, powders of vegetable origin, such as henna or sandalwood powders, titanium oxides and nanotitaniums (or nano-scale titanium oxides), iron oxides and nano-scale iron oxides, starch, or silicic acid anhydride powder. Mixture of these powders may also be used.
The amount of active powder in the lotion according to the invention preferably ranges from 0.005 to 9.5% and more preferably from 0.1 to 5% by weight with respect to the total weight of the lotion. These ranges include all specific values and subranges therebetween, such as 0.01, 0.02, 0.05, 0.2, 0.5, 1, 2, 3 and 8% by weight.
The hollow particles which are used in the lotion accor
Di Nola-Baron Liliana
Kishore Gollamudi S.
L'Oreal
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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