Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
1999-11-08
2001-09-25
Page, Thurman K. (Department: 1615)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S069000, C424S078030, C424S078310, C424S486000, C424S489000
Reexamination Certificate
active
06294180
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a cosmetic or dermatological powder containing at least one electrolyte, to a process for its manufacture and to a composition containing it. More particularly, the invention relates to the use of the powder or of the composition for the care and/or treatment of the skin, mucous membranes and/or the scalp, as well as for the treatment of skin disorders.
2. Description of the Background
Compositions containing electrolytes (inorganic and organic salts), which are useful for their beneficial effects on the skin, are known in cosmetics and dermatology. Certain electrolytes make it possible, in particular, to treat problems of sensitive skin and the pathological or physiological disorders associated with the release of substance P and/or TNF-alpha (Tumor Necrosis Factor-alpha) and in particular to treat sensitive skin, skin disorders and skin diseases. Such compositions are described, for example, in EP 0 737 471, EP 0 770 392 and EP 0 775 492.
Moreover, it is known that the incorporation of electrolytes into cosmetic or dermatological compositions containing water poses problems, because of the incompatibility of electrolytes with certain constituents usually employed in such compositions. Thus, for example, electrolytes are incopatible with the neutralized caboxyvinyl polymers usually used as gelling agents, since they “break” the emulsion and liquify it. As a result, compositions containing caboxyvinyl polymers and electrolytes lack consistency, which is counter to the result desired when a gelling agent is used.
It has now been found, unexpectedly, that it is possible to prepare a composition which is free of the drawbacks of the compositions of the prior art by incorporating electrolytes into an anhydrous powder containing a modified starch and which can contain at least one fatty substance.
Admittedly, JP-A-7/206,663 describes a bath powder containing inorganic salts, sugars and fatty substances. However, this powder has the drawback of being sensitive to moisture and bacteriological contamination. A need therefore continues to exist for salt-containing cosmetic compositions of improved pathological and physiological properties which are less sensitive to water and bacteriological contamination.
SUMMARY OF THE INVENTION
Accordingly, one object of the present invention is to provide a cosmetic composition which contains an electrolyte salt but which at the same time is stable at therapeutic concentrations of salt and is less sensitive to moisture and bacteriological contamination.
Briefly, this object and other objects of the present invention as hereinafter will become more readily apparent can be attained by a cosmetic or dermatological powder, which comprises, (i) from 5 to 60% by weight, relative to the total weight of the powder, of at least one starch modified by pregelatinization, oxidation, crosslinking, esterification or a combination thereof, (ii) from 30 to 90% by weight, relative to the total weight of the powder, of an oily phase comprising at least one oil, and (iii) at least one electrolyte, wherein the oily phase/starch weight ratio is ≧1.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The term “powder” in this invention means a solid substance divided into very fine, homogeneous particles or grains . The powder of the invention is preferably free of protein.
In one specific embodiment of the invention the powder comprises from 5 to 50% by weight, relative to the total weight of the powder, of at least one modified starch, from 0.1 to 40% by weight, relative to the total weight of the powder, of at least one electrolyte, and from 50 to 90% by weight, relative to the total weight of the powder, of an oily phase comprising at least one oil.
The cosmetic or dermatological powder of the invention comprises an oily phase fixed in the modified starch. This powder in particular has the advantages of being able to contain a large amount of electrolyte, of being applicable to any skin type without leaving a greasy effect, despite the large amount of oil, of being easy and quick to use, of penetrating the skin without leaving a visible film, of retaining the moisturizing or nourishing properties of the fatty substances and of not requiring the addition of a liquid such as water since it can be used in its existing form. In addition, the desired amount can be taken-up easily. Moreover, the powder of the invention is not sensitive to moisture or to bacteriological contamination. In addition, since this powder can be obtained without any emulsifier and since it keeps well, it is possible to avoid the addition of emulsifiers and/or preserving agents, and thus to obtain a powder which is much less of an irritant than the conventional skin care products.
In addition, the cosmetic product of the invention allows the incorporation of compounds therein which have different physicochemical properties. This product can thus comprise detergents. This makes it possible, in particular, to cleanse the skin while at the same time moisturizing and nourishing the skin. In fact, the present invention represents a significant contribution to the art since it provides a multipurpose cosmetic or dermatological product which is not specific to one skin type.
Another advantage of the powder of the invention is that compounds known to be sensitive to water and/or to oxidation, such as vitamins including vitamin C, vitamin A and esters thereof and enzymes, can be incorporated therein. In this medium, these compounds will keep for a long time and thus will not lose their activity over time.
Finally, the powder of the invention has the further advantage of also being able to be incorporated into a cosmetic and/or dermatological composition, such as a lotion, a W/O or O/W emulsion, or a triple emulsion. A composition is thus obtained which, although containing a large amount of electrolyte(s), remains stable even in the presence of compounds with which the electrolytes are usually incopatible.
An aspect of the present invention is also a cosmetic and/or dermatological composition, which comprises at least one powder as defined above.
The powder of the invention has a particle size or number-average particle size which can range in particular from about 0.1 to 100 &mgr;m, preferably from 0.5 to 50 &mgr;m, preferably from 1 to 10 &mgr;m, this particle size being measured using a “Microtrac X100 & SRA 150” machine obtained from Leeds-Northrup.
Suitable electrolytes which can be used in the composition of the invention include, in particular, salts of mono-, di- or trivalent metals, more particularly salts of alkaline earth metals and in particular barium, calcium and strontium salts, salts of alkali metals and, for example, sodium and potassium salts, as well as magnesium, beryllium, yttrium, lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, lithium, tin, zinc, manganese, cobalt, nickel, iron, copper, rubidium, aluminum, silicon and selenium salts, and mixtures thereof.
The anions constituting these salts can be selected, for example, from carbonates, bicarbonates, sulfates, glycerophosphates, borates, chlorides, nitrates, acetates, hydroxides and persulfates, as well as the salts of &agr;-hydroxy acids such as citrates, tartrates, lactates and malates or of fruit acids, or alternatively the salts of amino acids such as aspartate, arginate, glycocholate and fumarate.
Preferably, the salt is selected from calcium, magnesium, sodium and potassium salts and mixtures thereof, and more particularly magnesium chloride, potassium chloride, sodium chloride, calcium chloride and magnesium bromide, and mixtures thereof. It can be, in particular, a mixture comprising approximately from 6 to 10% of magnesium, from 11 to 15% of potassium, from 1 to 5% of sodium, up to 0.5% of calcium, from 30 to 45% of chlorides and less than 0. 1% of sulfates, the remainder being insoluble materials and water of recrystallization whi
Demars Gwenaeelle
Koely Sandrine
Fubara Blessing
L'Oreal
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Page Thurman K.
LandOfFree
Cosmetic and/or dermatological powder, process for its... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Cosmetic and/or dermatological powder, process for its..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cosmetic and/or dermatological powder, process for its... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2471509