Dermatological/cosmetic gel compositions suited for preventing or treating cell differentiation and/or proliferation and/or keratinization disorders, including preventing or treating common acne, comprise (i) at least one retinoid, (ii) dispersed benzoyl peroxide and (iii) at least one pH-independent gelling agent, formulated into (iv) a physiologically acceptable medium therefor.

Description of the Invention

SUMMARY OF THE INVENTION

The Applicant has now, surprisingly, produced a composition that satisfies this need, which comprises dispersed, free or encapsulated benzoyl peroxide, at least one retinoid and a pH-independent gelling agent with good physical stability, i.e., not showing a drop in viscosity over time and at temperatures of between 4 and 40.degree. C., and maintaining good chemical stability of the two active agents (benzoyl peroxide and retinoid), i.e., no degradation of the active agents over time and at temperature of between 4 and 40.degree. C. is observed. The Applicant has also discovered, surprisingly, that total dispersion of the active principles can be obtained by following a particular preparation process. This preparation process performed without heat makes it possible to obtain an optimum particle size and uniform dispersion of the two active agents in the composition, while at the same time ensuring the physical stability of the product.

The invention thus relates to a composition comprising, in a physiologically acceptable medium, at least one retinoid, dispersed benzoyl peroxide and at least one pH-independent gelling agent.

DETAILED DESCRIPTION OF BEST MODE AND SPECIFIC/PREFERRED EMBODIMENTS OF THE INVENTION

The composition according to the invention is preferably in the form of an aqueous gel.

The term "aqueous gel" means a composition containing, in an aqueous phase, a viscoelastic mass formed from colloidal suspensions (gelling agent).

The expression "pH-independent gelling agent" means a gelling agent capable of giving the composition a viscosity that is sufficient to keep the retinoid and the benzoyl peroxide in suspension, even under the influence of a variation in pH caused by the release of benzoic acid by the benzoyl peroxide.

Non-limiting examples that may be mentioned include the gelling agents of the polyacrylamide family, such as the mixture of sodium acryloyldimethyltaurate copolymer/isohexadecane/polysorbate 80 sold under the name Simulgel 600 by the company SEPPIC, the mixture of polyacrylamide/isoparaffin C13-14/laureth-7 such as, for example, the product sold under the name Sepigel 305 by the company SEPPIC, the family of acrylic polymers coupled to hydrophobic chains, such as the PEG-150/decyl/SMDI copolymer sold under the name Aculyn 44 (polycondensate comprising at least, as components, a polyethylene glycol containing 150 or 180 mol of ethylene oxide, decyl alcohol and methylenebis (4-cyclohexyl isocyanate) (SMDI), at 35% by weight in a mixture of propylene glycol (39%) and water (26%)), the family of modified starches, such as the modified potato starch sold under the name Structure Solanace, or mixtures thereof.

The preferred gelling agents are derived from the polyacrylamide family, such as Simulgel 600 or Sepigel 305, or mixtures thereof.

The gelling agent as described above may be used in preferential concentrations ranging from 0.1% to 15% and more preferably ranging from 0.5% to 5%.

The composition according to the invention contains at least one retinoid.

The term "retinoid" means any compound that binds to the RAR and/or RXR receptors.

Preferably, the retinoid is a compound chosen from the family of benzonaphthalene retinoids as described in patent application EP 0 199 636. In particular, adapalene and also precursors and/or derivatives thereof will be preferred.

The expression "retinoid precursors" means the immediate biological precursors or substrates thereof, and also the chemical precursors thereof.

The expression "retinoid derivative" means both their metabolic derivatives and their chemical derivatives.

Other retinoids may be chosen from those described in the following patents or patent applications: U.S. Pat. No. 4,666,941, U.S. Pat. No. 4,581,380, EP 0 210 929, 15 EP 0 232 199, EP 0 260 162, EP 0 292 348, EP 0 325 540, EP 0 359 621, EP 0 409 728, EP 0 409 740, EP 0 552 282, EP 0 584 191, EP 0 514 264, EP 0 514 269, EP 0 661 260, EP 0 661 258, EP 0 658 553, EP 0 679 628, EP 0 679 631, EP 0 679 630, EP 0 708 100, EP 0 709 382, EP 0 722 928, EP 0 728 739, EP 0 732 328, EP 0 740 937, EP 0 776 885, EP 0 776 881, EP 0 823 903, EP 0 832 057, EP 0 832 081, EP 0 816 352, EP 0 826 657, EP 0 874 626, EP 0 934 295, EP 0 915 823, EP 0 882 033, EP 0 850 909, EP 0 879 814, EP 0 952 974, EP 0 905 118, EP 0 947 496, WO 98/56783, WO 99/10322, WO 99/50239, WO 99/65872.

Needless to say, the amount of the two active agents, benzoyl peroxide and retinoid, in the composition according to the invention will depend on the combination chosen and thus particularly on the retinoid under consideration and the quality of the desired treatment.

The preferred retinoid concentrations are between 0.0001% and 20% by weight relative to the total weight of the composition.

Benzoyl peroxide may also be used in free form or in an encapsulated form in a form adsorbed onto, or absorbed in, any porous support. It may be, for example, benzoyl peroxide encapsulated in a polymer system consisting of porous microspheres, such as, for example, microsponges sold under the name Microsponges P009A Benzoyl peroxide by the company Advanced Polymer System.

To give an order of magnitude, the composition according to the invention advantageously comprises between 0.0001% and 20% by weight of benzoyl peroxide and between 0.0001% and 20% by weight of retinoid relative to the total weight of the composition, and preferably, respectively, between 0.025% and 10% by weight of benzoyl peroxide and between 0.001% and 10% by weight of retinoid relative to the total weight of the composition.

For example, in compositions for treating acne, the benzoyl peroxide is preferably used at concentrations ranging from 2% to 10% by weight and more particularly from 2.5% to 5% by weight, relative to the total weight of the composition. As regards the retinoid, it is used in this type of composition at concentrations generally ranging from 0.05% to 1% by weight relative to the total weight of the composition.

Advantageously, the particle size of the retinoid and of the benzoyl peroxide is such that at least 80% in numerical terms of the particles, and preferably at least 90% in numerical terms of the particles, have a diameter of less than 25 .mu.m and at least 99% in numerical terms of the particles have a diameter of less than 100 .mu.m.

According to the invention, the gel containing benzoyl peroxide and a retinoid advantageously comprises at least water and may also comprise a pro-penetrating agent and/or a liquid wetting surfactant.

The compositions of the invention may contain one or more pro-penetrating agents in preferential concentrations ranging from 0% to 20% and more preferably ranging from 2% to 6% by weight, relative to the total weight of the composition. They should generally not dissolve the active agents at the percentage used, should not cause any exothermic reactions harmful to the benzoyl peroxide, should aid in the satisfactory dispersion of the active agents, and should have antifoaming properties. Among the pro-penetrating agents preferably used, without this list being limiting, are compounds such as propylene glycol, dipropylene glycol, propylene glycol dipelargonate, lauroglycol and ethoxydiglycol.

The pro-penetrating agent that is particularly preferred is propylene glycol.

Advantageously, the compositions according to the invention may also contain one or more liquid wetting surfactants in preferential concentrations ranging from 0% to 10% and more preferably ranging from 0.1% to 2%. The wetting power is the tendency of a liquid to spread over a surface.

They are preferably surfactants with an HLB (Hydrophilic-Lipophilic Balance) value from 7 to 9, or nonionic surfactants such as polyoxyethylenated and/or polyoxypropylenated copolymers. They should be liquid so as to be readily incorporated into the composition without it being necessary to heat them.

Among the wetting agents that are preferably used, without this list being limiting, are compounds of the Poloxamer family and more particularly Poloxamer 124 and/or Poloxamer 182.

The liquid wetting surfactant that is particularly preferred is Poloxamer 124.

The composition may also comprise any additive usually used in the cosmetics or pharmaceutical field, such as sequestering agents, antioxidants, sunscreens, preserving agents, fillers, electrolytes, humectants, colorants, common mineral or organic acids or bases, fragrances, essential oils, cosmetic active agents, moisturizers, vitamins, essential fatty acids, sphingolipids, self-tanning compounds such as DHA, and calmants and protective agents for the skin such as allantoin. Needless to say, a person skilled in the art will take care to select this or these optional additional compound(s), and/or the amount thereof, such that the advantageous properties of the composition according to the invention are not, or are not substantially, adversely affected.

These additives may be present in the composition in a proportion of from 0% to 20% by weight relative to the total weight of the composition.

Examples of sequestering agents that may be mentioned include ethylenediaminetetraacetic acid (EDTA), and also derivatives or salts thereof, dihydroxyethylglycine, citric acid and tartaric acid, or mixtures thereof.

Examples of preserving agents that may be mentioned include benzalkonium chloride, phenoxy-ethanol, benzyl alcohol, diazolidinylurea and parabens, or mixtures thereof.

Examples of humectants that may be mentioned include glycerol and sorbitol.

In particular, the invention also relates to a pharmaceutical or cosmetic composition for topical application to the skin, the integuments or mucous membranes, in the form of an aqueous gel, characterized in that it contains, in a physiologically acceptable medium that is compatible with topical application to the skin, the integuments or mucous membranes, an active phase comprising (expressed in percentages by weight):

0% to 90%, preferably 5% to 25% and especially 10% to 20%, of water;

0% to 10%, preferably 0 to 2% and especially 0% to 0.5%, of liquid wetting surfactant;

0% to 20%, preferably 0% to 10% and especially 2% to 5%, of pro-penetrating agent;

0.0001% to 20% and preferably 0.025% to 10%, of benzoyl peroxide;

0.0001% to 20% and preferably 0.001% to 10%, of retinoid; and

an aqueous phase comprising a pH-independent gelling agent, and water.

The aqueous phase of the emulsion according to the invention may comprise water, a floral water such as cornflower water, or natural mineral or spring water chosen, for example, from eau de Vittel, waters of the Vichy basin, eau d'Uriage, eau de la Roche Posay, eau de la Bourboule, eau d'Enghien-les-Bains, eau de Saint Gervais-les-Bains, eau de Neris-les-Bains, eau d'Allevard-les-Bains, eau de Digne, eau de Maizieres, eau de Neyrac-les-Bains, eau de Lons-le-Saunier, les Eaux Bonnes, eau de Rochefort, eau de Saint Christau, eau des Fumades, eau de Tercis-les-bains, eau d'Avene or eau d'Aix les Bains.

The said aqueous phase may be present in a content of between 10% and 90% by weight and preferably between 20% and 80% by weight, relative to the total weight of the composition.

A composition that is preferred according to the invention comprises in water:

2.50% benzoyl peroxide,

0.10% adapalene,

0.10% disodium EDTA,

4.00% glycerol,

4.00% propylene glycol,

0.05% sodium docusate,

0.20% Poloxamer 124,

4.00% sodium acryloyldimethyltaurate copolymer & isohexadecane & polysorbate 80,

sodium hydroxide, qs pH 5.

A subject of the present invention is also the composition as described above, as a medicinal product.

The invention also relates to the use of the novel composition as described above in cosmetics and dermatology.

A subject of the invention is also a process for preparing a composition of aqueous gel type, comprising the production of an active phase, of an aqueous phase and of a gelling phase, at room temperature (RT), i.e., between 20 and 25.degree. C., and successively comprising the following steps:

a) the preparation of an aqueous phase comprising water and optionally a chelating agent and/or a pro-penetrating agent and/or a humectant;

b) the preparation of an active phase comprising the mixture in water of the retinoid, of benzoyl peroxide and, optionally, of a liquid wetting surfactant and/or of a pro-penetrating agent, with stirring;

c) the introduction of the active phase into the aqueous phase, with stirring; and

d) the introduction of the gelling agent into the mixture obtained from step c), with stirring.

In one embodiment, the process for preparing the aqueous gel composition, comprising the production of an active phase, of an aqueous phase and of a gelling phase, at room temperature, successively comprises the following steps:

a) the preparation of an aqueous phase comprising water and optionally a chelating agent and/or a pro-penetrating agent and/or a humectant;

b) the preparation of two active agents, one comprising the mixture in water of the retinoid, the other comprising the mixture in water of benzoyl peroxide and, optionally, of a liquid wetting surfactant and/or of a pro-penetrating agent, with stirring;

c) the introduction of the active phases into the aqueous phase, with stirring; and

d) the introduction of the gelling agent into the mixture obtained from step c), with stirring.

The aqueous gel prepared according to one of these procedures was found to provide many advantages over the preparation of other already-known aqueous gels, especially since it is simpler, and, since the incorporation of the gelling agent into the end of the process makes it possible to obtain better dispersion of the particles by enclosure, these gels may also be film-forming and may thus limit perspiration. At least 80% in numerical terms of the particles and preferably at least 90% in numerical terms of the particles have a diameter of less than 25 .mu.m and at least 99% in numerical terms of the particles have a diameter of less than 100 .mu.m in the composition.

On account of the keratolytic, bactericidal and antiinflammatory activity of benzoyl peroxide and the pronounced activity of retinoids in the fields of cell differentiation and proliferation, the compositions of the invention are particularly suitable in the following therapeutic fields:

1) for treating dermatological complaints associated with a keratinization disorder relating to differentiation and proliferation, especially for treating common acne, comedones, polymorphonuclear leukocytes, acne rosacea, nodulocystic acne, acne conglobata, senile acne, secondary acnes such as solar acne, medication-related acne or occupational acne, and suppurative hydradenitis, 2) for treating other types of keratinization disorder, especially ichtyosis, ichtyosiform conditions, Darier's disease, palmoplantar keratoderma, leukoplakia and leukoplakiform conditions, and cutaneous or mucous (buccal) lichen, 3) for treating other dermatological complaints associated with a keratinization disorder with an inflammatory and/or immunoallergic component, and especially all forms of psoriasis, whether cutaneous, mucous or ungual psoriasis, and even psoriatic rheumatism, or cutaneous atopy, such as eczema, or respiratory atopy, or even gingival hypertrophy; the compounds may also be used in certain inflammatory complaints not exhibiting a keratinization disorder, such as folliculitis, 4) for treating all dermal or epidermal proliferations, whether benign or malignant, and whether of viral origin or otherwise, such as common warts, flat warts, molluscum contagiosum and verruciform epidermodysplasia, oral or florid papillomatoses and proliferations that may be induced by ultraviolet radiation, especially in the case of actinic keratosis, 5) for repairing or combating aging of the skin, whether photo induced or chronological aging, or for reducing pigmentation, or any pathology associated with chronological or actinic aging, 6) for preventively or curatively treating cicatrization disorders and skin ulcers, for preventing or repairing stretch marks, or for promoting cicatrization, 7) for combating sebaceous function disorders such as the hyperseborrhoea of acne or simple seborrhoea, 8) in the treatment of any complaint of fungal origin on the skin, such as tinea pedis and tinea versicolor, 9) in the treatment of dermatological complaints with an immunological component, 10) in the treatment of skin disorders caused by exposure to UV rays, and 11) in the treatment of dermatological complaints associated with inflammation or infection of the tissues surrounding the hair follicles, caused especially by microbial colonization or infection, especially impetigo, seborrhoeic dermatitis, folliculitis or sycosis barbae, or involving any other bacterial or fungal agent.

The compositions according to the invention are particularly suitable for preventively or curatively treating common acne.

A subject of the invention also relates to the manufacture of a pharmaceutical preparation for preventing or treating dermatological complaints associated with cell differentiation and/or proliferation disorders and/or keratinization disorders, and also to the manufacture of a pharmaceutical preparation for preventing or treating common acne.

The compositions according to the invention also find an application in cosmetics, in particular for treating acne-prone skin, for regrowth of the hair, for preventing hair loss, for combating the greasy appearance of the skin or the hair, in protecting against the harmful effects of sunlight or in the treatment of physiologically dry skin, or for preventing and/or combating photo induced or chronological aging.

The compositions according to the invention also find an application in body and hair hygiene.

The present invention thus relates also to the cosmetic use of a composition according to the invention for treating acne-prone skin, for regrowth of the hair or for preventing hair loss, for combating the greasy appearance of the skin or the hair, in protecting against harmful effects of sunlight or in treating physiologically dry skin, or for preventing and/or controlling photo induced or chronological aging.
 

Claim 1 of 1 Claim

1. A physiologically acceptable aqueous gel composition for once-daily treatment of common acne comprising anti-acne actives consisting of 0.1% adapalene and/or at least one pharmaceutically acceptable salt thereof, 2.5% dispersed benzoyl peroxide, and further comprising 4% acrylamide sodium acryloyldimethyltaurate copolymer/isohexadecane/polysorbate 80 gelling agent, said percentages being based on the weight of the total aqueous gel composition.

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