Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
2000-01-24
2002-02-05
Page, Thurman K. (Department: 1615)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S400000, C424S070100, C424S070110, C424S070120, C424S078080, C424S434000
Reexamination Certificate
active
06344204
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a cosmetic and/or dermatological composition in the form of a fluid water-in-oil emulsion comprising a silicone emulsifier, at least one branched-chain hydrocarbonaceous oil and at least one volatile silicone oil and to its uses in caring for, making up, cleansing and/or removing make-up from the skin, mucous membranes, eyes and/or hair and in treating dry skin.
2. Description of the Background
In the cosmetics field, it is commonplace to use creams composed of a water-in-oil (W/O) emulsion comprising an aqueous phase dispersed in an oily phase. These emulsions comprise a continuous oily phase and therefore make it possible to form, at the surface of the skin, a lipid film which prevents transepidermal water loss and protects the skin from external attacks. These emulsions are particularly suitable for protecting and nourishing the skin and in particular for treating dry skin.
However, these emulsions, because of their “heavy” texture, lack freshness and fluidity and are difficult to work. They leave a greasy and sticky film on the skin. In addition, if the amount of internal (aqueous) phase is increased, so as to contribute more freshness and a less greasy feel, this results in the production of creams which are often compact and difficult to spread.
The need consequently remains for a composition in the form of a W/O emulsion which is sufficiently fluid to have a fresh feel, which is pleasant on application and which is easy to spread while retaining the emollient properties of emulsions with an external oily phase.
SUMMARY OF THE INVENTION
The inventors have now discovered, surprisingly, that a composition in the form of a water-in-oil emulsion comprising the combination of a branched-chain hydrocarbonaceous oil and of a volatile silicone oil in an amount representing at least 50% of the oily phase makes it possible to obtain a fluid composition which is light on application while retaining the usual properties of W/O emulsions.
Thus, the present invention provides a cosmetic and/or dermatological composition, comprising:
an aqueous phase dispersed in an oily phase,
at least one silicone emulsifier,
at least one branched-chain hydrocarbonaceous oil,
at least one volatile silicone oil, and
at least one polyol alkyl ester,
where the total amount of the branched-chain hydrocarbonaceous oil and of volatile silicone oil comprises at least 50% by weight of the oily phase
The present invention also provides a method of caring for, making up, removing make-up from and/or cleansing the skin, mucous membranes and/or hair, comprising applying the inventive composition to skin, mucous membranes and/or hair
The present invention also provides a method of preparing the inventive composition
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
The composition according to the present invention is fluid and exhibits the advantage of being light and fresh on application while leaving the skin soft, matt and non-sticky.
Mention may be made, as silicone emulsifiers which can enter into the composition according to the invention, of dimethicone copolyols and alkyl dimethicone copolyols. Mention may be made, as dimethicone copolyol, of, for example, the mixture of dimethicone copolyol, of cyclomethicone and of water (10/88/2) sold by Dow Corning under the name DC3225C or DC2-5225C. According to a preferred embodiment of the invention, use is made, as silicone emulsifier, of an alkyl dimethicone copolyol having an alkyl radical comprising from 10 to 22 carbon atoms, such as cetyl dimethicone copolyol, for example the product sold under the name Abil EM-90 by Goldschmidt and the mixture of dimethicone copolyol and of cyclopentasiloxane (85/15) sold under the name Abil EM-97 by Goldschmidt; lauryl dimethicone copolyol, for example the mixture of approximately 91% lauryl dimethicone copolyol and of approximately 9% isostearyl alcohol sold under the name Q2-5200 by Dow Coming; and their mixtures.
The silicone emulsifier is preferably used in a proportion as active material (that is to say, for example, as dimethicone copolyol or alkyl dimethicone copolyol) ranging from 0.5 to 10% and preferably from 1 to 6% by weight with respect to the total weight of the composition. These ranges include all specific values and subranges therebetween, such as 2, 3, 5 and 8% by weight.
The oily phase of the composition according to the invention comprises at least one branched-chain hydrocarbonaceous oil and at least one volatile silicone oil.
The branched-chain hydrocarbonaceous oil comprises from 10 to 20 carbon atoms and can be chosen, for example, from the group consisting of isohexadecane, isododecane, isoparaffins and their mixtures.
The volatile silicone oil can be chosen, for example, from cyclic or linear polydimethylsiloxanes and their mixtures. The cyclic polydimethylsiloxanes or cyclomethicones comprise from approximately 3 to 9 carbon atoms and preferably from 4 to 6 carbon atoms and can be, for example, cyclohexadimethylsiloxane and cyclopentadimethylsiloxane. The volatile linear polydimethylsiloxanes preferably comprise from approximately 3 to 9 carbon atoms. The volatile linear polydimethylsiloxanes generally have a viscosity at 25° C. of less than or equal to 5 cSt, whereas the cyclomethicones generally have a viscosity at 25° C. of less than or equal to 10 cSt.
The total amount of branched-chain hydrocarbonaceous oil(s) and of volatile silicone oil(s) represents at least 50% by weight of the oily phase, it being possible for the ratio of the amount of one type of oil to that of the other type of oil to vary to a large extent from the time that each oil is present, the concentration of each type of oil preferably being at least 1% by weight with respect to the total weight of the composition. Preferably, the total amount of branched-chain hydrocarbonaceous oil(s) and of volatile silicone oil(s) ranges from 60 to 100% by weight with respect to the total weight of the oily phase.
The oily phase can additionally comprise any fatty substance and in particular oils conventionally used in the cosmetics or dermatological fields. The other oils capable of being present in the oily phase can be, for example, oils of vegetable origin, such as apricot kernel oil and perhydrosqualene, synthetic oils, such as fatty esters, non-volatile silicone oils and fluorinated oils. The other fatty substances capable of being present in the oily phase can be, for example, fatty acids and fatty alcohols.
The oily phase of the emulsion can represent, for example, from 8 to 60% by weight and better still from 15 to 50% by weight with respect to the total weight of the composition. These ranges includes all specific value and subranges therebetween, such as 10, 12, 20, 30, 40 and 50% by weight.
According to a specific embodiment of the invention, the composition can additionally comprise one or more polyol alkyl esters. Mention may in particular be made, as polyol alkyl ester which can be used in the composition of the invention, of glycerol and/or sorbitan esters, for example polyglycerol isostearate, such as the product sold under the name Isolan GI 34 by Goldschmidt, sorbitan isostearate, such as the product sold under the name Arlacel 987 by ICI, glycerol sorbitan isostearate, such as the product sold under the name Arlacel 986 by ICI, the mixture of sorbitan isostearate and of polyglycerol isostearate, such as the product sold under the name Arlacel 1690 by ICI, and their mixtures.
When the composition comprises one or more polyol alkyl esters, the amount of polyol alkyl ester(s) can range, for example, from 0.05 to 5% and preferably from 0.1 to 1% by weight with respect to the total weight of the composition. These ranges includes all specific values and subranges therebetween, such as 0.2, 0.5, 2, 3 and 4% by weight.
The composition of the invent
Di Nola-Baron Liliana
L'Oreal
Page Thurman K.
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