Cosmetic compositions, in particular for cleansing the skin

Details Cosmetic compositions, in particular for cleansing the skin Cosmetic compositions, in particular for cleansing the skin

2000-08-28

2003-05-20

Padmanabhan, Sreeni (Department: 1617)

Drug, bio-affecting and body treating compositions

Preparations characterized by special physical form

Cosmetic, antiperspirant, dentifrice

C424S070190, C530S370000

Reexamination Certificate

active

06565863

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to transparent aqueous compositions containing acylisethionate and protein hydrolysate, and to the use of the said compositions, in particular in cosmetics for cleansing the skin, the hair, the lips and/or the eyes, as well as to the use of a protein hydrolysate for stabilizing an acylisethionate in an aqueous composition.
2. Background of the Invention
Cleansing the skin is very important for facial care. Compositions suited for this purpose should be of the highest possible performance quality, since greasy residues such as the excess of sebum, the residues of the cosmetic products used daily and make-up products, in particular waterproof make-up products, accumulate in the folds of the skin and on the surface of the skin and can block the skin pores and lead to the appearance of spots. Poor-quality cleansing is often among the factors responsible for a muddy complexion.
Among the skin-cleansing products commonly used are foam-forming cleansing products, which generally contain anionic surfactants. Attempts are made in particular to And prepare transparent foam-forming cleansing products since, just like water, transparency is a symbol of purity, and thus of cleanliness. Anionic surfactants which may be used in particular are acylisethionates such as cocoylisethionate, which are particularly advantageous since they produce a dense, fine, voluminous foam. However, these acylisethionates have the drawback of being unstable in aqueous solution: they recrystallize over time, and do so all the more quickly when the temperature is low (i.e., less than or equal to room temperature). On account of this instability, gels containing isethionates cannot be transparent. Consequently, it is impossible to formulate stable transparent foam-forming cleansing products containing an acylisethionate.
According to WO 98/26758, this drawback is overcome by adding an amphoteric surfactant such as an imidazoline derivative or a betaine. However, in order to make the isethionate fully soluble, a high level of amphoteric surfactant is necessary, and thus the amphoteric agent/isethionate weight ratio must be greater than 1. The introduction of an amphoteric agent to such a level as proposed by WO 98/126758 reduces the advantageous performance qualities of the cocoylisethionate, namely the density and creaminess of the foam.
U.S. Pat. No. 2,972,582 discloses a combination of acylisethionate and acyl polypeptide. However, this patent does not teach that acyl polypeptides make it possible to dissolve the acylisethionate and, moreover, describes opaque compositions in which the polypeptide is in insufficient amount to dissolve the acylisethionate, and compositions containing (lanolin) oil which have the drawback of leaving an oily deposit on the skin, which it is desired to avoid by using an oil-free aqueous composition.
Accordingly, there remains a need for a transparent aqueous composition containing an acylisethionate, which is stable over time and which does not have the drawbacks of the compositions described above.
SUMMARY OF THE INVENTION
The Inventors have found, surprisingly, that the recrystallization of acylisethionates can be avoided by means of using protein hydrolysates containing a hydrophobic group. In addition, these compounds allow the foam to retain the qualities obtained with cocoylisethionate, i.e., fineness, density and creaminess of the foam.
Accordingly, the present invention provides a transparent aqueous composition comprising, in a physiologically acceptable medium, (i) at least one acylisethionate, and (ii) at least one protein hydrolysate containing a hydrophobic group, in an amount which is sufficient to dissolve the acylisethionate.
The present invention provides a method of removing make-up from and/or for cleansing the skin, the hair, the lips and/or the eyes, comprising applying the composition of the present invention to the skin, the hair, the lips and/or the eyes.
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 expression “aqueous composition” as used herein refers to an oil-free composition containing water.
The expression “transparent” that when a sheet of newspaper is placed behind a transparent bottle containing the composition, the letters printed on the page can be distinguished.
The expression “physiologically acceptable medium” as used herein refers to a medium which is compatible with the skin, the lips, the scalp, the eyelashes, the eyes and/or the hair.
Moreover, the expression “protein hydrolysate containing a hydrophobic group” refers to a hydrolysis derivative of a protein comprising a hydrophobic group, where the hydrophobic group is naturally present in the protein or is added by reacting the protein and/or the protein hydrolysate with a hydrophobic compound.
The presence of the protein hydrolysate containing a hydrophobic group prevents the recrystallization of the acylisethionate. In addition, the mixture of acylisethionate and protein hydrolysate gives a much more advantageous foam quality than the mixture of acylisethionate and amphoteric agent present in known composition, i.e., a finer and denser foam. Furthermore, the product obtained is easier to rinse off and does not leave a film, unlike known products.
The total amount of protein hydrolysate containing a hydrophobic group in the composition of the invention should be sufficient to dissolve the acylisethionate. In practice, it is at least equal to and preferably greater than the amount by weight of acylisethionate. It preferably ranges from 0.5% to 30% by weight of active material, and more preferably from 1% to 10% by weight of active material, relative to the total weight of the composition. These ranges include all specific values and subranges therebetween, such as 2, 5, 8, 15, 20 and 25% by weight of active material.
Another aspect of the present invention is the use of an effective amount of at least one protein hydrolysate containing a hydrophobic group, to stabilize an acylisethionate in an aqueous composition.
An acylisethionate which may be used in the composition of the invention is a compound of formula (I):
RCO
2
(CH
2
)
n
SO
3
−
M
+
  (I)
where
R is a hydrocarbon-based radical containing from 6 to 26 carbon atoms,
n is an integer from 2 to 4, and
M is an ammonium group and/or an alkali metal or alkaline-earth metal, such as sodium, potassium, lithium or magnesium.
According to one preferred embodiment of the invention, the radical R in formula (I) contains from 8 to 22 carbon atoms and is selected from lauroyl, palmitoyl, caproyl, capryloyl, myristoyl, stearoyl, arachidoyl and oleyl radicals and mixtures of such radicals such as the cocoyl radical. M is preferably sodium, potassium and/or an ammonium group.
According to one particularly preferred embodiment of the invention, the acylisethionate used in the composition of the invention is sodium, potassium or ammonium cocoylisethionate.
The acylisethionate is generally present in the composition of the invention in an amount ranging from 0.5 to 15% and preferably from 1 to 10% by weight relative to the total weight of the composition. These ranges include all specific values and subranges therebetween, such as 2, 5, 8 and 12% by weight relative to the total weight of the composition.
As described above, the protein hydrolysate containing a hydrophobic group is a hydrolysis derivative of a protein comprising a hydrophobic group, where the hydrophobic group is naturally present in the protein or maybe added by reacting the protein and/or the protein hydrolysate with a hydrophobic compound. The proteins can be of plant origin or of animal origin, those of plant origin being preferred, and they can be quaternized or non-quaternized, and ionic or nonionic. The hydrophobic group can be, in particular, a fatty chain, for example an alky

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