FR2906138A1 - Cosmetic gel useful for skin treatment, comprises a water free oily base, a hydrophobic thickening agent, a solubilizing agent to provide a emulsifiable formulation and magnesium sulfate crystals suspension - Google Patents

Abstract

Cosmetic product for skin treatment, in the form of a gel, comprises: a water free oily base; a hydrophobic thickening agent, added to the base for raising its viscosity under controlled conditions; a solubilizing agent to provide a emulsifiable formulation; and magnesium sulfate crystals added to the emulsifiable formulation, to produce a gel in which the magnesium sulfate crystals are in suspension. An independent claim is included for the preparation of the cosmetic product comprising preparing water free oily base, preparing a hydrophobic thickening agent and adding to the base, adding a solubilizing agent to the thickened base to provide an emulsifiable formulation and adding magnesium sulfate crystals to the emulsifiable formulation to produce a gel.

Description

SPRINGSTEAD1.FRD 1 Cosmetic Skin Care Product Containing

  The invention relates to cosmetic products and more particularly relates to a cosmetic skin treatment product based on magnesium sulfate and a process for its preparation. It is known that magnesium sulphate has long been used in cosmetics because of its interesting properties. In particular, it is used as a topical, anti-inflammatory and anti-bacterial product when added to water. This then results in an electrolytic solution whose concentration varies depending on the amount of magnesium sulfate used. It is also known that magnesium sulfate crystals are soluble in water to their point. saturation and that maintaining the magnesium sulfate crystals in a liquid substance increases the concentration of magnesium beyond the saturation point. It is however difficult to maintain magnesium sulfate crystals in an undissolved phase in which they are able to exert their valuable properties. To prevent the magnesium sulfate crystals from melting, it is also known to incorporate them into an oil-based cosmetic formulation. But this results in an emulsion that is neither homogeneous nor fluid and that does not rinse when applied to the skin with water.

One of the objects of the invention is to provide a skin care cosmetic product in which magnesium sulfate crystals can be suspended for use as a scrubbing or exfoliating product on human skin or on the skin of an animal. Another object of the invention is to provide such a cosmetic product in which the magnesium sulfate crystals are capable of being converted into a magnesium-based hydrating fluid when they subsequently come into contact with water on the surface. of the skin of a human being or an animal.

Yet another object of the invention is to provide such a magnesium sulfate cosmetic product which is capable of leaving a molecular residue on the skin to facilitate the enzymatic function of the epidermis.

The invention provides for this purpose a cosmetic skin treatment product which is in the form of a gel comprising essentially the following ingredients: 1 / a water-free oily phase base, 2 / a thickening agent, hydrophobic properties, added to the base to raise its viscosity under controlled conditions, solubilizing agent to give an emulsifiable formulation, and magnesium crystals added in controlled amount to the formulation. emulsifying. The invention thus makes it possible to solve the incompatibility problem of water and oil, if one considers, for example, that the magnesium sulfate crystals in their hepta-hydrated form contain 77% of water.

According to the invention, the magnesium sulphate crystals are incorporated in a liposoluble and hydrophobic oil-based formulation, resulting in a homogeneous and fluid paste having a viscosity for application to the skin.

The magnesium sulfate crystals are thus intactly preserved until they are used where they can then exert their scrubbing function under conditions of duration which are controlled by the user.

When water is added, the constituent elements of these crystals, namely hydrogen, oxygen, sulfur and magnesium, are delivered to the skin. The solubility of the formulation allows the crystals to melt naturally in contact with water. The result is a final emulsion that is created by the user. In other words, the invention produces a gel in which the magnesium sulfate crystals are suspended in a controlled amount and concentration. When the product is then applied to the skin, the crystals of magnesium sulphate in suspension, due to their geometrical characteristics, produce an exfoliating action to which are added remineralizing and relaxing properties due to the properties of the sulphate of magnesium. magnesium. This exfoliating action eliminates impurities and dead cells accumulated on the surface of the epidermis. As a result, the treated skin is soft, smooth and truly embellished. In addition, magnesium sulfate helps maintain the balance of skin metabolism. The invention makes it possible, in an original way, first to prevent the magnesium crystals from melting before the emulsion is completed with water by the user, and then to use the crystals to exfoliate the skin. mechanically before the emulsion is complete.

As mentioned above, the cosmetic product of the invention has an oil phase base, which must be free of water. Advantageously, this base contains at least one oil.

In a preferred embodiment, this base contains grape seed oil (Latin name: vinis vitifera) whose softening properties have been known for a long time. In addition, this grape seed oil enriches the preparation.

The aforesaid base may further contain at least one additional ingredient selected from an emollient, a vitamin, a pigment, this list being given by way of example. In a preferred embodiment of the invention, the base 5 simultaneously contains these three additional ingredients, namely an emollient, a vitamin and a pigment. As an emollient, the product Myritol 318 from COGNIS Deutschland GmbH is advantageously used. This product contains an essential ingredient of caprylic or capric acid. The vitamin used is advantageously vitamin E.

This may be, for example, the Copherol 1250 product from COGNIS Deutschland GmbH. The pigment is advantageously a white color pigment, in particular titanium dioxide. An example of a suitable product for this purpose is the Eusolexo T-S product from MERCK. However, it is possible to use other acceptable pigments in cosmetics. The aforementioned base which serves for the preparation of the cosmetic product of the invention typically represents: from 30 to 40% by weight of the composition of the product, this percentage interval being given here as an indication. To this starting base is then added a thickening agent of hydrophobic properties.

By the term "thickening agent" is also meant a thixotropic agent which must possess hydrophobic properties and which is added to the base to raise its viscosity under controlled conditions. This thickener has indeed viscosity control properties. In a preferred embodiment of the invention, this thickening agent is fumed silica, i.e. heat-treated silica. In addition it is advantageous that this product undergoes a complementary chemical treatment such as with dimethyldichlcrosilane to replace a large number of hydroxyl groups with methyl groups.

An example of fumed silica is the BELSIL HDK H15 product produced by WACKER-CHEMIE GmbH. Another example is CAB-O-SIl TS-610 from CABOT CORPORATION. Chemically these products are silica dimethyl silylate.

Such a thickening agent has interesting properties enabling it to increase the viscosity and to provide thixotropic effects. This product should be added gently and gradually to the above base until fully incorporated to form a thickened base.

This thickening agent typically represents from 2 to 10% by weight of the product composition. In an advantageous embodiment, it represents about 4% by weight of the composition of the product. At the base thus thickened, a solubilizing agent is then added to give an emulsifiable formulation. In particular, it is possible to use a SOLUBILIZER LRI ANHYDRO which is composed of 65% of PPG-26 BUTETH-26 (propylene glycol) and 35% of PEG-40 (hydrogenated castor oil). The concentration of this product will be 2 to 10% by weight of the product composition. An advantageous value is 5% by weight of the product composition. The solubilizer can be added alone, but preferably with additional ingredients. Thus, in a preferred embodiment of the invention, the solubilizer is added along with a perfume and a preservative. In this case, the solubilizer, perfume and preservative are premixed before being added to the thickened base. Finally, the resulting formulation is then added magnesium sulfate crystals in a controlled amount to produce a gel in which these crystals remain in suspension. The crystals used can be mono-hydrated to polyhydrated crystals. One type of crystal or a mixture of different types can be used. Advantageously, the magnesium sulphate crystals represent from 25 to 75% by weight of the composition of the product, corresponding to a viscosity of medium thickness to a very thick viscosity. The invention thus relates to a process for the preparation of a cosmetic skin treatment product as defined above, which comprises the following operations: a) preparing a base in the oily phase that is free of water, b) preparing a thickening agent of hydrophobic properties, and add it to the base from step a) to raise the viscosity of this base under controlled conditions, c) add a solubilizing agent to the thickened base resulting from step b) to give an emulsifiable formulation, and d) adding magnesium sulfate crystals in controlled amount to the emulsifiable formulation of step c), so as to produce a gel in which the magnesium sulfate crystals are in suspension.

The invention will now be described in more detail with reference to the example below, it being understood that the invention can not be limited to this particular example. EXAMPLE A cosmetic product according to the invention is prepared in the form of a bulk product to form a gel with exfoliating properties. In this example, all percentages given are percentages by weight.

Firstly, an emollient is mixed, in the example the Myritol 318 product from COGNIS Deutschland GmbH in a concentration of 33.55% and the refined grape seed oil in an amount of 10%. 00%. These two ingredients are mixed with optional heating of the material to 45 C. To this mixture is then added vitamin E, in this case the product Copherol 1250 COGNIS Deutschland GmbH in a proportion of 0.20%.

The mixture thus obtained is homogenized and then a pigment, namely titanium dioxide, in particular the product Eusolexo T-S from MERCK, is added in an amount of 1.00% by weight. The above components are then blended to provide a cream base which is absolutely free of water. At this base, a thickening agent is added gently and progressively until it is completely mixed. In the example, pyrogenic silica such as the product BELSI: L HDK H15 from Wacker is used in a quantity representing 4.00% of the composition. At this stage, the following ingredients are premixed in another suitable container: an anhydrous solubilizer, a perfume, and a preservative. In the example, an SOLUBILIZER LRI ANHYDRO agent is used which is composed of 65% of PPG-26 BUTETH-26 (propylene glycol) and 35% of PEG-40 (hydrogenated castor oil) of the company in an amount of 30 5.00%, an allergen-free perfume in a quantity of 0.25% and the preservative PHENONIP of CLARIANT Intl Ltd in an amount of 1.00%. This mixture is introduced in the previous formulation.

Magnesium sulphate crystals previously sieved and homogenized are then added under controlled conditions. These crystals may be mono-to-polyhydrated crystals or a mixture of different types of crystals. In the exemplary embodiment, these crystals represent 45.00% of the composition. The mixture should be homogenized to obtain good dispersion of the magnesium salts. This gives a loose gel which can then be packaged in suitable bottles. The cosmetic product obtained is a scrubbing gel with exfoliating properties in which the magnesium sulfate crystals are in suspension. When this product is applied to the skin, magnesium sulphate crystals mechanically exert a scrubbing or exfoliating action.

It is an exfoliating and melting formulation that can be used on both human skin and animal skin to scrub and exfoliate epidermal cells in contact with rhombohedral sulphate crystals. magnesium. The formulation of the invention allows the magnesium crystals to remain in suspension until the water comes into contact with the formulation, leaving the resulting emulsion on the skin during use and then leaving a thin layer containing magnesium after rinsing. The cosmetic product of the invention has a creamy formulation and particularly studied emollient properties which give it relaxing, remineralizing and very soothing properties. The invention is not limited to the embodiment 5 previously given for illustrative purposes of the invention. The formulation is capable of many variants, including the different ingredients used in this composition.

Claims (13)

  1. Cosmetic skin treatment product, characterized in that it is in the form of a gel essentially comprising the following ingredients: 1) an oily phase base free from water,   2) a thickening agent of hydrophobic property, added to the base to raise its viscosity under controlled conditions,   3) a solubilizing agent to give an emulsifiable formulation, and   (4) Magnesium sulfate crystals added in controlled amounts to the emulsifiable formulation, thereby producing a gel in which the magnesium sulfate crystals are in suspension. 2. Cosmetic product according to claim 1, characterized in that the base contains at least one oil. 3. Cosmetic product according to claim 2, characterized in that the base contains grape seed oil. 4. Cosmetic product according to one of claims 2 and 3, characterized in that the base additionally contains at least one additional ingredient selected from an emollient, a vitamin, a pigment.   5. Cosmetic product according to one of claims 2 to 4, characterized in that the base represents from 30 to 40% by weight of the composition of the product. 12 2906138 13   6. Cosmetic product according to one of claims 1 to 5, characterized in that the thickening agent is fumed silica.   7. Cosmetic product according to one of claims 1 to 5, characterized in that the thickening agent is from 2 to 10% by weight of the product composition.   8. Cosmetic product according to one of claims 1 to 7, characterized in that the solubilizing agent is an anhydrous solubilizer.   9. Cosmetic product according to one of claims 1 to 8, characterized in that the solubilizing agent represents 2 to 10% by weight of the product composition.   10. Cosmetic product according to one of claims 1 to 9, characterized in that the solubilizing agent is mixed with at least one other ingredient selected from a perfume and a preservative.   11. Cosmetic product according to one of claims 1 to 10, characterized in that the magnesium sulphate crystals are mono-hydrated magnesium sulfate crystals to polyhydrate.   12. Cosmetic product according to one of claims 1 to 11, characterized in that the magnesium sulphate crystals represent from 25 to 75% by weight of the composition of the product.   13. A process for preparing a cosmetic skin treatment product according to one of claims 1 to 2906138 14 12, characterized in that it comprises the following operations. a) preparing a water-free oil-phase base, b) preparing a hydrophobic-thickening agent, and adding it to the base from step a) to raise the viscosity of this base under controlled conditions, c) adding a solubilizing agent to the thickened base resulting from step b) to give an emulsifiable formulation, and d) adding magnesium sulfate crystals in controlled amount to the emulsifiable formulation of step c) so to produce a gel in which the magnesium sulfate crystals are in suspension.