MXPA98004393A - Cleansing composition stabilized with opacifica - Google Patents

Abstract

The present invention relates to an opacified cosmetic emulsion composition containing an inorganic particulate substance as the opacifier, a surfactant and a hydroxy-functional wax to stabilize the emulsion against separation / precipitation of its components. It is particularly preferred as wax to trihydroxystearin and ceramide

Description

STABILIZED CLEANSING COMPOSITION WITH OPACIFIER AN1? CMENTES OF THE INVENTION Field of the Invention The invention relates to opaque cosmetic compositions with good foaming properties, especially a blender or combined moisturizer and a cleanser.

Related Technique Aqueous cosmetic compositions often require thickeners to obtain an aesthetically pleasing viscosity. Fluids that flow with an aqueous consistency run very quickly from the treated area of the skin. For a cosmetic to be effective, it must often present substantivity. Thickeners provide this substantivity. In addition, low viscosity formulas which can be effective on the skin, however, its watery condition indicates ineffectiveness to the consumer. The products of watery consistency are also aesthetically unpleasant to the consumers with hopes of rich and creamy products. Thickening is one, but not the only concern when formulating cosmetic emulsions. The stability of phases It is also a main concern. It must be avoided that the aqueous and oily phases are separated. A gradual loss of viscosity often indicates progressive breakdown of an emulsion. Certain types of cosmetic ingredients are particularly sensitive to instability. Inorganic opacifying agents are one such class of ingredients. It is difficult to stabilize emulsions that contain inorganic particulates when looking for aesthetically pleasing viscosity systems. A very important additional problem with thickened emulsions arises in the combined toning or wetting formulation and cleaning products. Emulsion stabilizing thickeners generally have an adverse impact on foaming capacity e. Accordingly, an object of the present invention is to provide an opacified cosmetic emulsion composition which is stabilized against separation. Another object of the present invention is to provide a stabilized and opacified cosmetic emulsion composition of satisfactory viscosity, which, however, does not inhibit the generation of foam from surfactant ingredients. These and other objects of the present invention will become more readily apparent from the description and examples that follow.

BRIEF DESCRIPTION OF THE INVENTION A cosmetic emulsion composition is provided, which includes: (i) from 0.01 to 5% of an inorganic opacifying pigment; (ii) from 0.1 to 50% of a surfactant; and (iii) an amount effective to stabilize the emulsion of a hydroxy-functional wax.

DEflCRipctON? GAT, T,? D? It has now been found that cosmetic opacifying emulsion compositions can be stabilized against separation with hydroxy-functional waxes. These compositions can function as combined humectants and cleansers. Wax with hydroxy functionality thickens and stabilizes the emulsion but has no adverse effects on foaming properties. The inorganic pigments are included in the present invention as opacifiers. Preferably, the inorganic pigment opacifier is a mica, especially a mica coated with titanium dioxide. This mica is commercially available under the trademark Timeron. The amounts of opacifying inorganic pigment can vary from 0.01 to %, preferably from 0.1 to 2%, optimally from 0.25 to 0.75% by weight. The stabilizing agents of the present invention are waxes with hydroxy functionality. These waxes will have melting points at temperatures ranging from 10 ° to 100 ° C. Preferably, the waxes are esters having at least 20 carbon atoms, preferably from 24 to 100 carbon atoms, optimally from 30 to 60 carbon atoms. Suitable waxes are triglyceride and ceramide esters. Among the suitable triglyceride esters are trihydroxystearin, with a melting point of about 85 ° C, available from Rheox Inc., Heightsto, New Jersey, sold under the trademark Thixcin. Suitable ceramides have the following structures.

WAX IDA 1 CERAMIDA 2 CERAMIDA 3 CERAMIDA 4 CERAMIDA 5 CERAMIDA 6 The most preferred of this group of substances is ceramide 6. The amounts of wax can vary from 0.0001 to 5%, preferably from 0.01 to 2%, optimally from 0.01 to 0.2% by weight. The cosmetic compositions of the present invention can be emulsions of any variety, water in oil or oil in water, the latter being preferred. The amounts of water can vary from 5 to 99.9% by weight. In the composition of this invention, surfactants are included as foaming / cleaning agents. The total concentration of the surfactant will vary from 0.1 to 50%, preferably from 0.5 to 20%, optimally from 1 to 10% by weight of the total composition. The surfactant may be selected from the group consisting of anionic, non-ionic, cationic and amphoteric activities. Particularly preferred nonionic surfactants are those with a C 10 -C 20 fatty alcohol or an acid hydrophobe condensed with from 2 to 100 moles of ethylene oxide or propylene oxide per mole of hydrophobe; the C2-C10 alkylphenols condensed with from 2 to 20 moles of alkylene oxide; mono- and di-esters of ethylene glycol fatty acid; fatty acid monoglyceride; sorbitan, mono- and di-fatty acids of C9-C20; and polyoxyethylene sorbitan, as well as combinations thereof. Alkyl polyglycosides such as fatty amides of saccharides (for example methylglucamides) are also suitable nonionic surfactants. Preferred anionic surfactants include soap, sulfate and alkyl ether sulfonates, alkyl sulfates and sulphonates, alkyl glyceryl ethers, alkylbenzene sulphonates, alkyl and dialkyl sulfosuccinates, C8-C20 acyl isethionates and combinations thereof.

Preferred amphoteric surfactants include amine oxides, betaines or sultaines. Cocamidopropylbetaine is particularly preferred. The cosmetic emulsion compositions of the present The invention may contain various additional materials. Examples include fatty acids, humectants, preservatives, biologically active materials and other adjuvant ingredients. These are described more fully afterwards. Fatty acids ranging from 8 to 30 carbon atoms as humectants in the compositions of this invention. Illustrative of this category are the pelargonic, lauric, myristic, palmitic, stearic, isostearic, hydroxystéaric, oleic, linoleic, resinoleic, arachidic, behenic and erucic acids. Hydroblasts of the polyhydric alcohol type can be included as humectants in the compositions of this invention. The moisturizing aids increase the effectiveness of the emollients, reduce the desquamation, stimulate the removal of accumulated desquamation and improve the sensation in the skin. The Typical polyhydric alcohols include glycerol (also known as glycerin), polyalkylene glycols and more preferably alkylene polyols and their derivatives, which include propylene glycol, dipropylene glycol, polypropylene glycol, polyethylene glycol and derivatives thereof, sorbitol, hydroxypropylsorbitol, hexylene glycol, 1,2-butylene glycol, 1,2,6- hexanotriol, ethoxylated glycerol, propoxylated glycerol and mixtures thereof. For best results, the preferred humectant is propylene glycol. The amount of humectant can vary anywhere from 0.5 to 30%, preferably between 1 and 15% by weight of the composition. The compositions of the present invention may also contain C 1 -C 20 α-hydroxycarboxylic acids and salts thereof. The salts are preferably alkali metal, ammonium and alkanolammonium salts of Cj ^ -C ^. The illustrative acids are glycolic acid, lactic acid and 2-hydroxycaprilic acid. A combination of glycolic and 2-hydroxycaprilic acids is more preferred, and its ammonium salts. The levels of these materials can vary from 0.01 to 15%, preferably from 0.1 to 9%, optimally between 0.5 and 7% by weight of the cosmetic composition. Condoms may be desirably incorporated into the cosmetic compositions of this invention to protect against the growth of potentially harmful microorganisms. Conventional preservatives suitable for compositions of this invention are alkyl esters of para-hydroxybenzoic acid. Other condoms which have been most recently in use include idantoin derivatives, propionate salts and a variety of quaternary ammonium compounds. Cosmetic chemists are familiar with appropriate condoms and usually choose them to meet exposure tests - Lu of condoms and to provide stability to the product. Particularly preferred condoms are disodium EDTA, phenoxyethanol, methylparaben, propylparaben, imidazolidinylurea (commercially available as Germall 115 ^), sodium dehydroacetate and benzyl alcohol. Condoms can be selected when considering the use of the composition and possible incompatibilities between condoms and other ingredients in the emulsion. The condoms are preferably used in amounts ranging from 0.01% to 2% by weight of the composition. Minor adjuvant ingredients may also be present in the cosmetic compositions. These ingredients include vitamins (such as vitamin B6, vitamin C, ascorbyl palmitate, vitamin A palmitate, vitamin E acetate, biotin, niacin and DL-panthenol), amino acids (such as glycine and serine), biohyaluronic acid (with oligosaccharides) , available as Actiglide J1 Special from Active Organics US) and sodium PCA. Natural plant materials from renewable sources are often desirable in cosmetic compositions. For example, the cosmetic compositions of the present invention may include β-glucan derived from oats, commercially available under the trademark Microat CP from Nurture Inc., Missoula, Mont. Another natural material is commercially available pseudocollagen from Brooks, Inc., South Plainfield, N.J. The quantities of each of the above materials can vary from 0.001 to 10%, preferably from 0.05 to 1%, optimally between 0.1 and 0.5% by weight. Dyes, fragrances and abrasives may also be included in the compositions of the present invention. Each of these substances can vary from 0.05 to 5%, preferably between 0.1 and 3% by weight. The following examples will more fully illustrate the embodiments of this invention. All parts, percentages and proportions referenced herein and in the appended claims are by weight, unless otherwise indicated.

Examples 1 to 10 A series of compositions according to the present invention are listed below. These illustrate the use of trihydroxystearin to stabilize combined wetting and cleansing compositions.

Table I * includes rosemary extract, sage extract and witch hazel Examples 11-20 A series of compositions according to the present invention are listed below. These illustrate the use of Ceramide 6 to stabilize the combined wetting and cleansing compositions.

Table II E.JAMPLO 21 A series of experiments are carried out to evaluate the effect of traditional thickeners to stabilize the emulsion as well as its effect on foaming. For evaluation purposes, a cleanser / humectant base formulation with components as listed under Table III was used.

TABLE III TABLE IV Formulations and results of stability with various thickeners As can be seen from Table IV, many popular types of thickeners such as Veegum ", Methocel" and xanthan gum do not They have stabilizing characteristics for the emulsion. Only Thixcin ™ * and ceramide 6 provide the formula containing mica with stability against separation / precipitation. The foaming properties of the formulations D, E, F, G and H were at least identical to that of the base formula (Table III). The description and examples above illustrate selected embodiments of the present invention. In light thereof, variations and modifications will be suggested to a person familiar with the art, all of which are within the spirit and scope of this invention. It is noted that in relation to this date, the best method known by the applicant to carry out the aforementioned invention, is the conventional one for the manufacture of the objects to which it relates. Having described the invention as above, property is claimed as contained in the following:

Claims (9)

1. A cosmetic emulsion composition, with good foaming properties, characterized in that it comprises: (i) from 0.01 to 5% of an inorganic opacifying pigment; (ii) from 0.1 to 50% of an anionic surfactant (iii) an amount effective to stabilize the emulsion of a hydroxy-functional wax.

2. The composition according to claim 1, characterized in that the inorganic opacifying pigment is mica.

3. The composition according to claim 2, characterized in that the mica is coated with titanium dioxide.

4. The composition according to claim 1, characterized in that the hydroxy-functional wax is trihydroxystearin.

5. The composition according to claim 1, characterized in that the hydroxy-functional wax is a ceramide.

6. The composition according to claim 5, characterized in that the ceramide is Ceramide 6.

7. The composition according to claim 1, characterized in that it further comprises a humectant which is selected from the group consisting of polyhydric alcohols, C8-C30 fatty acids and mixtures thereof.

8. The composition according to claim 1, characterized in that the anionic surfactant is selected from the group consisting of alkyl ether sulphates and sulfonates, alkyl sulfates and sulphonates, alkyl glyceryl ethers, alkylbenzene sulphonates, alkyl and dialkyl sulfosuccinates, isethionates of C8-C20 acyl and combinations thereof.

9. The composition according to claim 8, characterized in that the anionic surfactant is present from 1 to 10% by weight.