CAPIGEL 98 PDF

The compositions have cosmetic applications. Various thickeners exist and are already used for these purposes. Natural products such as guar gum or corn starch are known in particular, the drawbacks of which are those inherent to natural products, such as price fluctuations, supply difficulties and random quality. Synthetic thickening polymers in the form of an inverted latex, that is to say one in which the continuous phase is an oil, are also known. However, such copolymers have monoacrylamide contents which, although extremely low, could result in making them impossible to use in cosmetics in the near future, following changes in the European legislation on hazardous substances. The Applicant has thus been concerned with the synthesis and development of polymers that thicken, even at acidic pH, in the form of an inverted latex, without using monoacrylamide.

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The compositions have cosmetic applications. Various thickeners exist and are already used for these purposes. Natural products such as guar gum or corn starch are known in particular, the drawbacks of which are those inherent to natural products, such as price fluctuations, supply difficulties and random quality. Synthetic thickening polymers in the form of an inverted latex, that is to say one in which the continuous phase is an oil, are also known.

However, such copolymers have monoacrylamide contents which, although extremely low, could result in making them impossible to use in cosmetics in the near future, following changes in the European legislation on hazardous substances. The Applicant has thus been concerned with the synthesis and development of polymers that thicken, even at acidic pH, in the form of an inverted latex, without using monoacrylamide.

The term branched polymer is understood to denote a non-linear polymer which has pendant chains so as to obtain, when this polymer is dissolved in water, a high degree of entangling leading to very high low-gradient viscosities. The term crosslinked polymer is understood to denote a non-linear polymer in the form of a three-dimensional network which is insoluble in water but swellable in water and thus leading to the production of a chemical gel.

The subject of the invention is, in particular, a composition as defined above, characterized in that the anionic polyelectrolyte is the result of a copolymerization of its precursor monomers, which is carried out at a pH below 4. The strongly acidic function of the monomer containing it is, in particular, a sulphonic acid function or a phosphonic acid function, partially or totally salified.

The monomer can be for instance, styrenesulfonic acid partially or totally salified. The weakly acidic function of the monomer containing it is, in particular, a carboxylic acid function, and the monomer is preferably chosen from acrylic acid, methacrylic acid, itaconic acid and maleic acid.

The neutral monomer is chosen in particular from 2-hydroxyethyl acrylate, 2,3-dihydroxypropyl acrylate, 2-hydroxyethyl methacrylate and 2,3-dihydroxypropyl methacrylate, or an ethoxylated derivative, with a molecular weight between and , of each of these esters.

The latex according to the invention generally contains from 2. This oil phase either consists of a commercial mineral oil containing saturated hydrocarbons such as paraffins, isoparaffins or cycloparaffins having, at room temperature, a density of between 0. It is marketed in France by the company Bayer. The latices according to the invention can also contain various additives such as completing agents, transfer agents or chain-limiting agents. According to another aspect of the present invention, its subject is a process for preparing the composition as defined above, characterized in that:.

According to a variant of this process, the reaction medium obtained after step b is concentrated by distillation before step c is carried out.

According to another preferred embodiment of the process, the starting aqueous solution is adjusted to a pH below or equal to 4 before step c is carried out.

The subject of the invention is also the use of the composition as defined above for preparing a cosmetic, dermo-pharmaceutical or pharmaceutical topical composition. A topical composition according to the invention, intended to be applied to the skin or mucous membranes of humans or animals can consist of a topical emulsion comprising at least one aqueous phase and at least one oil phase.

This topical emulsion can be of the oil-in-water type. More particularly, this topical emulsion can consist of a fluid emulsion, such as a fluid gel or milk. The oil phase of the topical emulsion can consist of a mixture of one or more oils. A topical composition according to the invention can be intended for cosmetic use or can be used to prepare a medical product intended for the treatment of mucous and skin diseases. In the latter case, the topical composition then contains an active principle which can consist, for example, of an anti-inflammatory agent, a muscle relaxant, an antifungal agent or an antibacterial agent.

When the topical composition is used as a cosmetic composition intended to be applied to the skin or mucous membranes, it may or may not contain an active principle, for example a moisturizer, a tanning agent, a sunscreen, an anti-wrinkle agent, a slimming agent, an anti-radical agent, an antiacne agent or an antifungal agent. A topical composition according to the invention usually contains between 0.

The pH of the topical composition is preferably above or equal to 5. The topical composition can also contain compounds conventionally included in compositions of this type, for example fragrances, preserving agents, dyes, emollients or surfactants. According to yet another aspect, the invention relates to the use of the novel thickener mentioned above, in accordance with the invention, to thicken and emulsify a topical composition comprising at least one aqueous phase.

The pH of the aqueous phase described above is adjusted to 3. In parallel, an organic phase is prepared by introducing the following ingredients successively into a stirred beaker:. The emulsion obtained is then transferred into a polymerization reactor. After a period which is sufficient to obtain good homogenization of the solution, aqueous sodium metabisulphite solution 0.

The introduction is carried out over about 60 minutes. During this introduction, the temperature in the polymerization reactor is allowed to rise to the final polymerization temperature. In parallel, an organic phase is prepared by introducing the following successively into a stirred beaker:.

After a sufficient time for good homogenization of the solution, 25 g of aqueous sodium metabisulfite solution 0. During this introduction, the temperature in the polymerization reactor is allowed to rise to the final polymerization temperature and the reaction mixture is then maintained for about 90 minutes at this temperature.

The examples which follow use, without distinction, the emulsions prepared according to one of paragraphs A a to A e which are referred to in the following examples—compound of Example 1.

The cream-gels obtained in the various cases are stable and have an entirely homogeneous appearance. Their viscosity is given in the following table:. Composition 1 thus makes it possible to disperse and stabilize the fatty phases in an aqueous medium, by simple dilution without a neutralization step being necessary.

A cream-gel comprising 2. The results are as follows:. The viscosity in mPa. The results given in the following table show that the viscosity of these gels is not affected by the presence of solvents. The composition according to claim 1, wherein the anionic polyelectrolyte is the result of a copolymerization of its precursor monomers, which is carried out at a pH less than 4.

The composition according to claim 1, wherein the molar proportion ranges from 0. The composition according to claim 1, further comprising from 2. The composition according to claim 14, wherein the oil phase is made up of isohexadecane or white mineral oil. The composition according to claim 1, further comprising one or more additives selected from the group consisting of complexing agents, transfer agents and chain-limiting agents. The process according to claim 18, further comprising concentrating the reaction medium obtained after step b by distillation before step c is carried out.

The process according to claim 18, wherein the starting aqueous solution is adjusted to a pH less than or equal to 4 before step c is carried out. Cosmetic, dermal-pharmaceutical or pharmaceutical composition comprising from 0. The cosmetic composition according to claim 22, in the form of a milk, lotion, gel, cream, cream-gel, soap, foam bath, balm, shampoo or conditioner.

In parallel, an organic phase is prepared by introducing the following ingredients successively into a stirred beaker: g of isohexadecane 25 g of Montane 80 VG sorbitan oleate sold by SEPPIC 0. The reaction medium is then held at this temperature for about 90 minutes. The desired emulsion is obtained. Brookfield, No. It is observed that the final product is free of acrylamide. It is observed that the final product is also free of acrylamide.

In parallel, an organic phase is prepared by introducing the following successively into a stirred beaker: g of isohexadecane, 25 g of Montano X80 VG sorbitan oleate ethoxylated with 20 mol of ethylene oxide, sold by SEPPIC and 0. The pH is lowered to 3.

Preserving agent: q. Water: q. Referenced Cited. Patent Documents September 3, Duncan et al. Patent History. Current U. Justia Legal Resources.

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CAPIGEL™ 98

Kind code of ref document : A2. Kind code of ref document : A3. Effective date : Aqueous compositions containing about 0. When dispensed by a pump sprayer the compositions afford a dense, uniform, stable foam which when spread on the skin gives an elegant cushioning foam pad effect between the hand and skin. This application relates to skin cleansers. More particularly it relates to clear, aqueous, foamable skin cleansers which when tested in accordance with the procedure specified herein qualify as being ultra-mild to the skin.

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