Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
1999-12-02
2002-05-21
Dees, José G. (Department: 1616)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S063000, C424S064000, C424S070100, C424S070700, C424S400000, C514S844000, C514S937000, C516S021000, C516S023000
Reexamination Certificate
active
06391322
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a composition in the form of a cream composed of a water-in-oil (W/O) emulsion having a high content of wax and to its uses in the cosmetics and dermatological fields. The invention also relates to methods of for caring for, treating and/or making up the skin and/or mucous membranes, and more particularly in the treatment of wrinkles and/or fine lines of the skin and/or in the treatment of dry skin. The invention also relates to a process for the preparation of the composition, wherein at least one stage of the process is carried out using a mixer-extruder.
2. Discussion of the Background
It is known to use waxes in cosmetic creams which are provided in the form of emulsions for caring for human skin, in particular for the anti-wrinkle effects of these waxes. Nevertheless, it is difficult to incorporate a high percentage of waxes in such compositions because waxes have a tendency to greatly thicken emulsions. In addition, when a high percentage of waxes is incorporated in an emulsion, the emulsion is very difficult to apply to the skin because it does not slip. Furthermore, a rough effect is produced on the skin. As a result, both the attractiveness and effective use of such an emulsion is significantly and undesirably reduced.
It is also known to incorporate a high percentage of waxes in mascaras. However, because of the above-mentioned disadvantages, compositions of this type cannot be used as a care product.
To prepare an emulsion that contains waxes, it is necessary to melt the e waxes in the fatty phase of the emulsion. This is particularly so if, for example, one wishes to use waxes having particularly advantageous anti-wrinkle effects on the skin, such as carnauba waxes. It is therefore necessary to heat the fatty phase to temperatures of 80-85° C., which is particularly harmful if one wishes to incorporate heat-sensitive compounds into the composition.
The need therefore remains for a composition having the consistency of a cream and containing a significant percentage of waxes without the disadvantages of the prior art.
Surprisingly, it has now been found that it is possible to incorporate a high percentage of waxes in creams in the form of W/O emulsions, while retaining satisfactory fluidity and a pleasant feeling during application on the skin, by preparing the emulsion under cold conditions using a silicone emulsifier and starting from a soft oily phase having a high percentage of waxes.
SUMMARY OF THE INVENTION
Thus, one object of the present invention is to provide a composition having the consistency of a cream.
Another object of the invention is to provide a composition having a significant percentage of waxes without the above-mentioned disadvantages.
Another object of the invention is to provide a composition having a high percentage of waxes in creams in the form of W/O emulsions.
Another object of the invention is to provide a composition having satisfactory fluidity and a pleasant feeling during application on the skin,
These and other objects of the invention have been achieved by the present invention, the first embodiment of which provides a composition in the form of a cream composed of a water-in-oil emulsion that includes an aqueous phase dispersed in an oily phase, wherein it includes at least 25% by weight of an aqueous phase with respect to the total weight of the composition, at least one silicone emulsifier and at least 5% by weight of one or more waxes with respect to the total weight of the composition.
Another embodiment of the invention provides a cosmetic and/or dermatological composition, that includes the above composition.
Another embodiment of the invention provides a method of treating, protecting, caring for and/or cleansing the skin, mucous membranes and/or hair and/or in making up the skin and/or mucous membranes, that includes applying to the skin, mucous membranes and/or hair the above composition.
Another embodiment of the invention provides a method of treating wrinkles and/or fine lines of the skin, that includes applying to the skin the above composition.
Another embodiment of the invention provides a method of treating and/or protecting dry skin, that includes applying to the skin the above composition.
Another embodiment of the invention provides a process for preparing the above composition, that includes at least one step using a screw mixer-extruder.
BRIEF DESCRIPTION OF THE PREFERRED EMBODIMENTS
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 of the preferred embodiments of the invention.
The composition of the invention is in the form of a cream, that is to say a soft product, in contrast to a solid product, such as a stick. In the context of the present invention, a cream preferably has a viscosity at ambient temperature (approximately 20-25° C.) ranging from approximately 1 to 25 Pa·s and preferably from approximately 1 to 10 Pa·s, this viscosity being measured with a Rheomat 180.
The composition of the invention, although containing a high level of wax, also contains a significant level of aqueous phase and is therefore fresh on application. In addition, since the mixing of the aqueous phase and the oily phase is carried out under cold conditions, heat-sensitive compounds can be incorporated without fear of their decomposition.
Preferably, the composition of the invention contains, in the oily phase, at least 5% by weight of one or more waxes with respect to the total weight of the composition. The cooled oily phase, before it is mixed with the aqueous phase, preferably exists in the form of a soft paste at ambient temperature (approximately 25° C.). The term “soft paste” is understood here to mean a paste for which the viscosity can be measured, in contrast to the solid structure of a tube or stick, for which the viscosity cannot be measured. The dynamic viscosity of the soft paste at 25° C. is generally between 3 and 35 Pa·s, measured with a Contraves TV rotary viscometer equipped with an “MS-r4” rotor at a frequency of 60 Hz.
Preferable waxes which can be used in the composition of the invention include, for example, mineral waxes, such as microcrystalline waxes, paraffin wax, petrolatum wax, petroleum wax, ozokerite or montan wax; animal waxes, such as beeswax, lanolin and its derivatives; vegetable waxes, such as candelilla, ouricurry, carnauba or japan waxes, cocoa butter, or cork fibre or sugar cane waxes; hydrogenated oils which are solid at 25° C.; fatty esters and glycerides which are solid at 25° C.; synthetic waxes, such as polyethylene waxes and waxes obtained by the Fischer-Tropsch synthesis; silicone waxes, and their mixtures.
According to a preferred embodiment of the invention, use is made of at least one wax having a starting melting temperature greater than or equal to 50° C. and better still at least one wax for which the starting melting temperature is greater than 65° C., such as carnauba wax, some polyethylene waxes and some microcrystalline waxes, such as that sold by the company Tisco under the name “Tisco Wax 881, or that sold by the company RMC under the name of “Feruwax 30540”.
Preferably, the term “starting melting temperature” is understood to mean the temperature at which a wax begins to melt. This temperature can be determined by DTA (differential thermal analysis), which makes it possible to obtain a thermogram (or melt curve) of the wax under consideration. The starting melting temperature corresponds to the temperature at which a significant change of slope in the thermogram can be observed. The melting point, for its part, represents the minimum point in the thermogram.
The amount of wax(es) in the composition of the invention is at least 5% and preferably ranges from 5 to 30% and better still from 5 to 15% by weight with respect to the total weight of the composition. These ranges include all subranges and values therebetween.
The amount of oily phase co
Daubige Therese
Roulier Veronique
Dees Jos,e G.
L'Oreal
Lamm Marina
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