Water-in-oil cosmetic sunscreen composition, use of water-in-oil cosmetic sunscreen composition, and method for producing water-in-oil cosmetic sunscreen composition

Abstract

The present invention relates to novel water-in-oil cosmetic sunscreen compositions, in particular for use in skin care, make-up and photoprotection, comprising (a) at least one pigment, (b) at least one UV filter, (c) polydimethylsiloxane and (d) water, wherein the weight ratio between water and polydimethylsiloxane is specified. The invention also relates to the use of the water-in-oil cosmetic sunscreen composition and to a method for producing the water-in-oil cosmetic sunscreen composition.

Description

Technical Field

[0001] The present invention relates to novel water-in-oil cosmetic sunscreen compositions, in particular for use in skin care, make-up and photoprotection, comprising (a) at least one pigment, (b) at least one UV filter, (c) polydimethylsiloxane and (d) water, wherein the weight ratio between water and polydimethylsiloxane is specified. The invention also relates to the use of the water-in-oil cosmetic sunscreen composition and a method for producing the water-in-oil cosmetic sunscreen composition. Background Art

[0002] Photoprotection of keratinous materials (including both skin and hair) is considered very important in order to protect against sun damage, sunburn, photoaging, and to reduce the chance of developing skin cancer caused by exposure to ultraviolet ("UV") radiation. There are typically two types of UVA / UVB cosmetic sunscreen compositions used to achieve photoprotection, namely inorganic UV filters and organic UV filters.

[0003] The degree of UV protection provided by a cosmetic sunscreen composition is related to the amount, type and combination of UV filters contained therein. In particular, a cosmetic sunscreen composition must provide good protection against sunlight as measured by the Sun Protection Factor (SPF) value, a desired balance between UVA and UVB protection, in particular a minimum UVA protection factor, and also have a satisfactory sensory perception, such as a smooth, non-greasy feel upon application.

[0004] Furthermore, it is desirable to produce a cosmetic sunscreen composition that not only provides photoprotection to keratinous materials but also provides additional properties. For example, it is desirable to produce a pigmented cosmetic sunscreen composition with a high SPF, the ability to color the skin to correct blemishes (preferably with high coverage and a velvety feel on the skin), which can be adapted to different skin tones, thereby providing a cosmetic effect.

[0005] The degree of coverage provided by a pigmented cosmetic sunscreen composition when applied to the skin is directly related to the amount of pigment present in the composition.A velvety feel on the skin is achieved by the use of silicones, particularly dimethicone, in the formulation.

[0006] However, this combination of properties is difficult to achieve, particularly because the presence of large amounts of pigments and UV filters in pigmented cosmetic sunscreen compositions leads to stability issues in the formulation, particularly due to pigment migration to the surface of the composition, which can even cause discoloration spots on the surface. Furthermore, silicones tend to separate from the composition, resulting in undesirable phase separation. These problems are exacerbated in darker shades of pigmented cosmetic sunscreen compositions.

[0007] Water-in-oil emulsions are a highly sought-after galenic form due to their ease of application to the skin and their organoleptic properties in cosmetics of the care sector, in particular in cosmetic sunscreen compositions, anti-aging compositions and makeup such as foundations.

[0008] Water-in-oil emulsions do not always exhibit a completely satisfactory storage stability at low temperature (i.e. 4° C.), ambient temperature (i.e. 25° C.) and elevated temperature (i.e. 45° C. and 55° C.) on the one hand, and do not always exhibit completely satisfactory sensory properties such as softness, non-sticky effect, non-greasy effect, velvety feel on the skin, light feeling after application or good glide on the other hand.

[0009] Therefore, there is a need for a water-in-oil pigmented cosmetic sunscreen composition having a high SPF and a high amount of pigment to provide high color coverage when applied to the skin, which composition is stable, provides fully satisfactory sensory properties, and does not exhibit migration and separation of pigments and silicones on the surface of the composition.

[0010] The inventors of the present invention have surprisingly endeavored to develop a pigmented water-in-oil cosmetic sunscreen composition having a high SPF, a satisfactory balance between UVA and UVB protection, and a high amount of pigments, thereby providing a high coverage effect on the skin similar to that of makeup, while maintaining good sensory attributes and stability. Summary of the Invention

[0011] The present invention relates to novel water-in-oil cosmetic sunscreen compositions, in particular for use in skin care, make-up and photoprotection, comprising (a) at least one pigment, (b) at least one UV filter, (c) polydimethylsiloxane and (d) water, wherein the weight ratio between water and polydimethylsiloxane is specified. The invention also relates to the use of the water-in-oil cosmetic sunscreen composition and a method for producing the water-in-oil cosmetic sunscreen composition.

[0012] Other features and advantages of the present invention will be apparent from the following more detailed description of the desired embodiment, which illustrates by way of example the principles of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 、 2 and 3 show the results of the stability test of Example 11, wherein Figure 1 The results related to the prior art composition of Example 5, while Figure 2 and 3 The results relate to the water-in-oil cosmetic sunscreen compositions according to the invention according to Examples 8 and 10, respectively. DETAILED DESCRIPTION

[0014] In one embodiment, the water-in-oil cosmetic sunscreen composition of the present invention comprises:

[0015] (a) from about 10.0 to about 25.0 weight percent of at least one pigment, based on the total weight of the composition;

[0016] (b) from about 15.0 to about 35.0 weight percent, based on the total weight of the composition, of at least one UV filter;

[0017] (c) from about 8.0 to about 20 weight percent of polydimethylsiloxane, based on the total weight of the composition; and

[0018] (d) Water

[0019] The weight ratio of water to polydimethylsiloxane is in the range of about 1:0.30 to about 1:0.55.

[0020] In one embodiment, the amount of the at least one pigment in the water-in-oil cosmetic sunscreen composition of the present invention is in the range of from about 10.0 to about 20.0 weight % based on the total weight of the composition, more preferably in the range of from about 15.0 to about 20.0 weight % based on the total weight of the composition.

[0021] In a preferred embodiment, the amount of at least one UV filter in the water-in-oil cosmetic sunscreen composition of the present invention is in the range of about 20.0 to about 30.0 wt.-%, based on the total weight of the composition, more preferably in the range of about 20.0 to about 25.0 wt.-%, based on the total weight of the composition.

[0022] Preferably, the amount of dimethicone in the water-in-oil cosmetic sunscreen composition of the present invention ranges from about 10.0 to about 15.0 wt. %, more preferably from about 10.0 to about 13.0 wt. %, based on the total weight of the composition.

[0023] In a preferred embodiment, the weight ratio between water and dimethicone is in the range of about 1:0.35 to about 1:0.50, more preferably about 1:0.40 to about 1:0.45.

[0024] Furthermore, the water-in-oil cosmetic sunscreen composition according to the invention may also comprise additional cosmetically acceptable ingredients chosen from active compounds, fillers, preservatives, silicones other than dimethicone, solvents other than water, surfactants, vitamins and mixtures thereof.

[0025] Preferably, the water-in-oil cosmetic sunscreen composition according to the present invention has a sun protection factor (SPF) in the range of about 30 to about 80, more preferably in the range of about 40 to about 70, even more preferably about 60. In various embodiments, the water-in-oil cosmetic sunscreen composition according to the present invention can exhibit an SPF of about 30, about 35, about 40, about 45, about 50, about 55, about 60, about 65, about 70, about 75 or about 80. In a preferred embodiment, the composition according to the present invention provides a UVA protection factor of at least 20.

[0026] The water-in-oil type cosmetic sunscreen composition of the present invention can be used as a daily product for skin, particularly as a daily product for skin care, makeup and light protection.

[0027] The present invention also relates to the use of the water-in-oil cosmetic sunscreen composition for producing products for skin care, makeup and light protection with high SPF and high color coverage.

[0028] In addition, the present invention also relates to a method for producing the water-in-oil cosmetic sunscreen composition, wherein the method comprises the following steps:

[0029] i) adding water, UV filters, dimethicone and optionally further cosmetically acceptable ingredients to a main container at a temperature in the range of about 20 to about 60°C,

[0030] ii) adding at least one pigment to the main container at a temperature in the range of about 25 to about 30°C.

[0031] In a preferred embodiment of the process according to the invention, step (i) is performed in two different sub-steps, wherein:

[0032] i.1) firstly the aqueous phase ingredients are mixed with one another in the main container, thereby forming an aqueous phase, and

[0033] i.2) The oily ingredients are then added separately to the aqueous phase, thereby forming an emulsion.

[0034] the term

[0035] For the purposes of the present invention, the expression "water-in-oil composition" and similar expressions are taken to mean water-in-oil (W / O) emulsions, also called inverse emulsions.

[0036] As used herein, the term "dimethicone" means at least one silicone ingredient having the INCI name dimethicone (dimethicone or dimethylpolysiloxane).

[0037] As used herein, the expression "at least" means one or more than one and thus includes individual components as well as mixtures / combinations.

[0038] As used herein, all ranges provided are intended to include each specific range within the given range and the combination of subranges between the given ranges. Thus, a range of 1-5 specifically includes 1, 2, 3, 4, and 5, as well as subranges such as 2-5, 3-5, 2-3, 2-4, 1-4, etc. All ranges and values disclosed herein are inclusive and combinable. For example, any value or point described herein that falls within the ranges described herein can be used as a minimum or maximum value for deriving a subrange, etc.

[0039] The terms "comprising," "having," and "including" are used in their open, non-limiting sense.

[0040] The compositions and methods of the present disclosure can comprise, consist of, or consist essentially of the essential elements and limitations of the disclosure described herein, as well as any additional or optional ingredients, components, or limitations described herein or otherwise applicable.

[0041] The terms "a", "an" and "the" are understood to cover the plural as well as the singular. Thus, the term "mixtures thereof" also relates to "mixtures thereof". Throughout this disclosure, the term "mixtures thereof" is used after a list of elements as shown in the following examples (wherein the letters AF represent elements): "one or more elements selected from the group consisting of A, B, C, D, E, F and mixtures thereof". The term "mixtures thereof" does not require that the mixture include all of A, B, C, D, E and F (although all of A, B, C, D, E and F may be included). On the contrary, it means that a mixture of any two or more of A, B, C, D, E and F may be included. In other words, it is equivalent to the phrase "one or more elements selected from the group consisting of A, B, C, D, E, F and mixtures of any two or more of A, B, C, D, E and F".

[0042] All percentages, parts and ratios herein are based upon the total weight of the compositions of the present disclosure, unless otherwise specified.

[0043] Except in the operating examples, or where otherwise indicated, all numbers expressing quantities of ingredients and / or reaction conditions are to be understood as modified in all instances by the term "about," which may encompass + / - 10%, + / - 8%, + / - 6%, + / - 5%, + / - 4%, + / - 3%, + / - 2%, + / - 1% or + / - 0.5%.

[0044] Likewise, the term "salts thereof" also refers to "salts thereof". Thus, where the present disclosure refers to "an element selected from the group consisting of A, B, C, D, E, F, salts thereof, and mixtures thereof", it means that it may include one or more of A, B, C, D, and F, may include one or more of the salts of A, B, C, D, E, and F, or may include a mixture of any two of the salts of A, B, C, D, E, F, the salts of A, B, C, D, E, and F.

[0045] References to salts throughout this disclosure may include salts with counterions such as alkali metal, alkaline earth metal or ammonium counterions. However, this list of counterions is non-limiting.

[0046] All components and elements explicitly recited in the present disclosure may be negatively excluded from the claims. In other words, the compositions of the present disclosure may be free of or substantially free of all components and elements explicitly recited throughout the present disclosure.

[0047] All publications and patent applications cited in this specification are hereby incorporated by reference and for any and all purposes to the same extent as if each individual publication or patent application was specifically and individually indicated to be incorporated by reference. In the event of any inconsistency between the present disclosure and any publication or patent application incorporated herein by reference, the present disclosure controls.

[0048] pigment

[0049] The water-in-oil cosmetic sunscreen composition according to the invention comprises at least one pigment.

[0050] The term "pigment" is intended to mean white or colored mineral or organic particles which are insoluble in aqueous media and which are intended to color and / or opacify the resulting composition and / or deposit. These pigments may be white or colored, and mineral and / or organic.

[0051] According to a particular embodiment, the pigments used according to the invention are chosen from mineral pigments.

[0052] The term "mineral pigment" is intended to mean any pigment that meets the definition in the chapter on inorganic pigments in Ullmann's Encyclopedia. Among the mineral pigments that can be used in the present invention, mention may be made of zirconium oxide or cerium oxide, as well as zinc oxide, iron oxide (black, yellow or red) or chromium oxide, manganese violet, ultramarine, hydrated chromium and ferric blue, titanium dioxide and metal powders (for example aluminum powder and copper powder). The following mineral pigments can also be used: Ta2O5, Ti3O5, Ti2O3, TiO, ZrO2, as a mixture with TiO2, ZrO2, Nb2O5, CeO2, ZnS.

[0053] In the context of the present invention, mineral pigments are more particularly iron oxide and / or titanium dioxide. Examples that may be mentioned more particularly include titanium dioxide and iron oxide coated with aluminum stearoyl glutamate, such as sold under the reference NAI by the company Miyoshi Kasei. Other preferred examples include titanium dioxide and iron oxide coated with disodium stearoyl glutamate and aluminum hydroxide.

[0054] For the purposes of the present invention, a "coating" of a pigment according to the invention generally means a complete or partial surface treatment of the pigment with a surfactant which is absorbed, adsorbed or grafted onto the pigment.

[0055] The coating may comprise about 0.1 to about 20.0 wt %, and specifically about 0.5 to about 5.0 wt %, relative to the total weight of the coated pigment.

[0056] Coating can be carried out, for example, by absorbing the surfactant onto the surface of the solid particles by simply mixing the particles and the liquid surfactant with stirring, optionally with heating, before incorporating the solid particles into the other ingredients of the cosmetic or care composition.

[0057] The coating can be carried out, for example, by chemical reaction of the surfactant with the surface of the solid pigment particles and formation of covalent bonds between the surfactant and the particles. This method is described in particular in patent US4578266.

[0058] Chemical surface treatment may involve diluting a surfactant in a volatile solvent, dispersing the pigment in the mixture, and then slowly evaporating the volatile solvent to deposit the surfactant on the surface of the pigment.

[0059] The amount of the at least one pigment in the water-in-oil cosmetic sunscreen composition according to the present invention is in the range of about 10.0 to about 25.0 wt. %, preferably about 10.0 to about 20.0 wt. %, more preferably about 15.0 to about 20.0 wt. %, based on the total weight of the composition.

[0060] UV filters

[0061] The UV filter of the water-in-oil cosmetic sunscreen composition of the present invention is selected from the group consisting of oil-soluble organic sunscreen ingredients and water-soluble organic sunscreen ingredients. Non-limiting suitable organic UV filters of the present invention are further described below.

[0062] Oil-soluble organic sunscreen ingredients

[0063] "Oil-soluble organic sunscreen ingredient" means any organic compound used to screen UV radiation which is completely soluble or miscible in an oil phase in molecular form, or which is soluble in a lipid phase in colloid form (eg, micelle form).

[0064] Non-limiting examples of oil-soluble organic sunscreen ingredients that can be used in the present invention include, for example, cinnamic acid derivatives; anthranilates; salicylic acid derivatives; dibenzoylmethane derivatives; camphor derivatives; benzophenone derivatives; diphenylacrylate derivatives; triazine derivatives; benzotriazole derivatives; benzalmalonate derivatives, especially those cited in patent US5624663; benzimidazole derivatives; imidazoline; bis-benzoazolyl derivatives, such as those described in patents EP669323 and US2463264. ; para-aminobenzoic acid (PABA) derivatives; methylene bis (hydroxyphenyl benzotriazole) derivatives, such as those described in applications US5237071, US5166355, GB2303549, DE19726184 and EP893119; benzoxazole derivatives, such as those described in patent applications EP0832642, EP1027883, EP1300137 and DE10162844; screening polymers and screening silicones silicone), such as those described in particular in patent application WO 93 / 04665; dimers derived from alkylstyrenes, such as those described in patent application DE 19855649; 4,4-diarylbutadienes, such as those described in patent applications EP 0 967 200, DE 19746 654, DE 19755649, EP-A-1 008 586, EP 1 133 980 and EP 1 133 981, merocyanine derivatives, such as those described in patent applications WO 04 / 006878, WO 05 / 058269 and WO 06 / 032741; and mixtures thereof, the entire contents of these patents and patent applications being incorporated by reference in their entirety.

[0065] As examples of other suitable oil-soluble organic sunscreen ingredients, mention may be made of the following represented by their INCI names:

[0066] Cinnamic acid derivatives:

[0067] Examples of suitable cinnamic acid derivatives include, but are not limited to, ethylhexyl methoxycinnamate, isopropyl methoxycinnamate, isoamyl methoxycinnamate, DEA methoxycinnamate, diisopropyl methylcinnamate, dimethoxycinnamate glyceryl ethylhexanoate.

[0068] Dibenzoylmethane derivatives:

[0069] Examples of suitable dibenzoylmethane derivatives include, but are not limited to, butyl methoxydibenzoylmethane and isopropyl dibenzoylmethane.

[0070] Salicylic acid derivatives:

[0071] Examples of suitable salicylic acid derivatives include, but are not limited to, homosalate, ethylhexyl salicylate, dipropylene glycol salicylate, and TEA salicylate.

[0072] β,β-Diphenylacrylate derivatives:

[0073] Examples of suitable β,β-diphenylacrylate derivatives include, but are not limited to, octocrylene and etocrylene.

[0074] Benzophenone derivatives:

[0075] Examples of suitable benzophenone derivatives include, but are not limited to, benzophenone-1, benzophenone-2, benzophenone-3 or oxybenzone, benzophenone-4, benzophenone-5, benzophenone-6, benzophenone-8, benzophenone-9, benzophenone-12, n-hexyl 2-(4-diethylamino-2-hydroxybenzoyl)benzoate, or as a mixture with octyl methoxycinnamate.

[0076] Benzylidene camphor derivatives:

[0077] Examples of suitable benzylidene camphor derivatives include, but are not limited to, manufactured 3-benzylidene camphor, 4-methylbenzylidene camphor, manufactured polyacrylamidomethylbenzylidene camphor.

[0078] Phenylbenzotriazole derivatives:

[0079] Examples of suitable phenylbenzotriazole derivatives include, but are not limited to, drometrizole trisiloxane, methylene bis-benzotriazolyl tetramethylbutylphenol, or in micronized form as an aqueous dispersion.

[0080] Triazine derivatives:

[0081] Examples of suitable triazine derivatives include, but are not limited to, bis-ethylhexyloxyphenol methoxyphenyl triazine, ethylhexyl triazone, diethylhexyl butyramido triazone, 2,4,6-tris(dineopentyl 4'-aminobenzylidenemalonate)-s-triazine, 2,4,6-tris(diisobutyl 4'-aminobenzylidenemalonate)-s-triazine, 2,4-bis(dineopentyl 4'-aminobenzylidenemalonate)-6-(n-butyl 4'-aminobenzoate)-s-triazine, described in US Pat. No. 6,225,467, in patent application WO 2004 / 085412 (see compounds 6 and 9), or in the literature "Symmetrical Triazine Derivatives" IP.COM Journal, IP.COM Inc., West Symmetrical triazine screening agents, particularly 2,4,6-tris(biphenyl)-1,3,5-triazine (particularly 2,4,6-tris(biphenyl-4-yl)-1,3,5-triazine and 2,4,6-tris(terphenyl)-1,3,5-triazine, described in Henrietta, NY, US (September 20, 2004), are included in patent applications WO 06 / 035000, WO 06 / 034982, WO 06 / 034991, WO 06 / 035007, WO 2006 / 034992, and WO 2006 / 034985).

[0082] Anthranilic acid derivatives:

[0083] Examples of suitable anthranilic acid derivatives include, but are not limited to, menthyl anthranilate.

[0084] Imidazoline derivatives:

[0085] Examples of suitable imidazoline derivatives include, but are not limited to, ethylhexyl dimethoxybenzylidenedioxoimidazolinium propionate.

[0086] Benzalmalonate derivatives:

[0087] Examples of suitable benzalmalonate derivatives include, but are not limited to, polyorganosiloxanes containing benzalmalonate functional groups, such as polysilicone-15 (organic silicone polymer-15).

[0088] 4,4-Diarylbutadiene derivatives:

[0089] Examples of suitable 4,4-diarylbutadiene derivatives include, but are not limited to, 1-dicarboxy(2,2'-dimethylpropyl)-4,4-diphenyl-butadiene.

[0090] Benzoxazole derivatives:

[0091] Examples of suitable benzoxazole derivatives include, but are not limited to, 2,4-bis[5-(1-dimethylpropyl)benzoxazol-2-yl-(4-phenyl)imino]-6-(2-ethylhexyl)imino-1,3,5-triazine and mixtures thereof.

[0092] Water-soluble organic sunscreen ingredients

[0093] "Water-soluble organic sunscreen ingredient" means any organic compound used to screen for UV radiation which is completely soluble or miscible in a liquid aqueous phase in molecular form, or which is soluble in a liquid aqueous phase in colloid form, for example in the form of micelles.

[0094] Non-limiting examples of water-soluble organic sunscreen ingredients useful in the present invention include, for example, terephthalylidene dicamphorsulfonic acid (Ecamsule), phenylbenzimidazolesulfonic acid (Ensulizole), benzophenone-4, aminobenzoic acid (PABA), 4-bis(polyethoxy)-polyethoxyethyl para-aminobenzoate (PEG-25PABA), camphor benzalkonium methosulfate, methylene bis-benzotriazolyl tetramethylbutylphenol (Bisoctrizole), phenyl dibenzimidazole tetrasulfonic acid disodium (Bisdisulizoledisodium) and tris-biphenyltriazine; their derivatives and corresponding salts; naphthalene bisimide derivatives, such as those disclosed in European Patent Application EP1990372 A2 (incorporated herein by reference in its entirety); and cinnamamidoamine cationic quaternary salts and derivatives, such as those described in US Patent No. 5,601,811 (incorporated herein by reference in its entirety), and mixtures thereof.

[0095] The salts of the compounds that can be used according to the invention are in particular chosen from: salts of alkali metals (e.g. sodium or potassium); salts of alkaline earth metals (e.g. calcium, magnesium or strontium); metal salts (e.g. zinc, aluminum, manganese or copper); ammonium salts of the formula NH4+; quaternary ammonium salts; salts of organic amines, such as methylamine, dimethylamine, trimethylamine, triethylamine, ethylamine, 2-hydroxyethylamine, bis(2-hydroxyethyl)amine or tris(2-hydroxyethyl)amine; lysine salts or arginine salts. Preferably, salts chosen from sodium, potassium, magnesium, strontium, copper, manganese or zinc salts are used. Preferably, sodium salts are used.

[0096] In a preferred embodiment, the at least one UV filter of the water-in-oil cosmetic sunscreen composition of the present invention is selected from the group consisting of octocrylene, ethylhexyl salicylate, butyl methoxydibenzoylmethane, bis-ethylhexyloxyphenol methoxyphenyl triazine, homosalate, and mixtures thereof. In a more preferred embodiment, the at least one UV filter comprises ethylhexyl salicylate in a concentration of not more than about 5.0% by weight.

[0097] The amount of at least one UV filter in the water-in-oil cosmetic sunscreen composition of the present invention is preferably in the range of from about 15.0 to about 35.0 wt.-%, more preferably from about 20.0 to about 30.0 wt.-%, even more preferably from about 20.0 to about 25.0 wt.-%, based on the total weight of the composition.

[0098] water

[0099] The water-in-oil cosmetic sunscreen composition of the present invention comprises water. The water used may be sterile softened water and / or deionized water and / or floral water, such as rose water, cornflower water, chamomile water or lime water, and / or natural thermal water or mineral water, such as, for example, water from Vittel, water from the Vichy basin, water from Uriage, water from La Roche-Posay, water from La Bourboule, water from Enghien-les-Bains, water from Saint Gervais-les-Bains, water from Neris-les-Bains, water from Allevar-les-Bains, water from Digne, water from Maizieres, water from Neyrac-les-Bains, water from Lons-le-Saunier, water from Eaux-Bonnes, water from Rochefort, water from Saint Christau, water from Les Fumades, water from Tercis-les-Bains or water from Avene. The water may also include reconstructed hot spring water, that is, water containing trace elements such as zinc, copper, magnesium, etc. that reconstruct the properties of hot spring water.

[0100] In a preferred embodiment, the weight ratio between water and dimethicone of the water-in-oil cosmetic sunscreen composition of the present invention is in the range of about 1:0.30 to about 1:0.55, more preferably about 1:0.35 to about 1:0.50, even more preferably about 1:0.40 to about 1:0.45.

[0101] Additional ingredients

[0102] In addition to the essential components described above, the water-in-oil cosmetic sunscreen composition of the present invention may also contain any customary cosmetically acceptable ingredients, which may be chosen especially from active compounds, fillers, preservatives, silicones other than dimethicone, solvents other than water, surfactants, vitamins and mixtures thereof.

[0103] A person skilled in the art will take care to choose the optional further ingredients and / or their amounts such that the advantageous properties of the composition according to the invention are not or not substantially adversely affected by the envisaged addition.

[0104] Suitable polymers include, but are not limited to, acrylates / acrylic acid C 10-30 Alkyl ester crosspolymers, styrene / acrylate copolymers and mixtures thereof.

[0105] The composition may further comprise at least one silicone component other than dimethicone, which may be caprylyl methicone, vinyl dimethicone / methicone silsesquioxane crosspolymer, or the like.

[0106] Non-limiting examples of preservatives that may be used in accordance with the present invention include phenoxyethanol.

[0107] Additional suitable solvents include, but are not limited to, benzoic acid C 12-15 Alkyl esters, pentylene glycol, propylene glycol, caprylyl glycol, propylene glycol, ethanol and mixtures thereof.

[0108] Suitable surfactants can be chosen from fatty acid esters of polyols, selected from esters of polyhydroxystearic acid and dicarboxylic acids obtained by esterifying polyglycerol with a mixture of (i) polyhydroxystearic acid (having 2 to 5 12-hydroxystearic acid units), (ii) a linear or branched aliphatic dicarboxylic acid containing 4 to 14 carbon atoms, and (iii) a saturated or unsaturated linear or branched fatty acid containing 16 to 20 carbon atoms. In particular, the fatty acid ester of a polyol is polyglyceryl-4 diisostearate / polyhydroxystearate / sebacate. Suitable surfactants are also chosen from polyethylene glycol esters, in particular PEG-30 dipolyhydroxystearate.

[0109] In various embodiments, solvents other than water are present at a concentration of about 0.5 to about 30.0 wt %, or about 5.0 to about 25.0 wt %, or about 5.0 to about 20.0 wt %, based on the total weight of the combinations and / or compositions of the present disclosure.

[0110] Suitable additional active compounds include, but are not limited to, disodium EDTA, triethanolamine, magnesium sulfate, caffeine, and mixtures thereof.

[0111] The composition may also comprise at least one filler such as silica, polylactic acid, disteardimonium hectorite, mica and kaolin.Preferred embodiments of mica include synthetic mica having the INCI name synthetic fluorphlogopite.

[0112] Suitable vitamins according to the present invention may include niacinamide and tocopherol.

[0113] The additional ingredients may comprise from about 10.0 to about 60.0 weight percent, such as from about 15.0 to about 55.0 weight percent, such as from about 15.0 to about 50.0 weight percent, or such as from about 15.0 to about 30.0 weight percent, based on the total weight of the composition.

[0114] By way of non-limiting illustration, the invention will now be described with reference to the following embodiments and examples.

[0115] Implementation Plan

[0116] One example of a suitable water-in-oil cosmetic sunscreen composition according to the present invention comprises:

[0117] - 9.0 to 16.0 wt. % of iron oxide (and) disodium stearoyl glutamate (and) aluminum hydroxide, based on the total weight of the composition;

[0118] - 1.0 to 3.0 wt. % of synthetic fluorphlogopite, based on the total weight of the composition;

[0119] - 20.0 to 25.0% by weight of octocrylene, ethylhexyl salicylate, butyl methoxydibenzoylmethane, bis-ethylhexyloxyphenol methoxyphenyl triazine and homosalate, based on the total weight of the composition;

[0120] - 10.0 to 15.0% by weight of polydimethylsiloxane, based on the total weight of the composition;

[0121] - water, wherein the weight ratio between water and polydimethylsiloxane is in the range of 1:0.35 to 1:0.50;

[0122] - 0.1 to 2.0% by weight of propylene glycol, based on the total weight of the composition;

[0123] -1.0 to 3.0% magnesium sulfate and caffeine;

[0124] - 0.1 to 2.0% of disteardimonium hectorite;

[0125] -0.1 to 1.5% phenoxyethanol;

[0126] - 1.0 to 5.0 wt. % of vinyl dimethicone / methicone silsesquioxane crosspolymer, based on the total weight of the composition;

[0127] - 0.1 to 3.0 wt. % of polyglyceryl-4 diisostearate / polyhydroxystearate / sebacate and PEG-30 dipolyhydroxystearate, based on the total weight of the composition;

[0128] - 1.0 to 5.0 wt. % of niacinamide and tocopherol, based on the total weight of the composition; and

[0129] -5.0 to 15.0% propylene glycol and ethanol.

[0130] Another suitable water-in-oil cosmetic sunscreen composition according to the invention comprises:

[0131] - 1.0 to 10.0 wt. % of iron oxide (and) disodium stearoyl glutamate (and) aluminum hydroxide, based on the total weight of the composition;

[0132] - 8.0 to 15.0 wt. % of titanium dioxide (and) disodium stearoyl glutamate (and) aluminum hydroxide, based on the total weight of the composition;

[0133] - 1.0 to 3.0 wt. % of synthetic fluorphlogopite, based on the total weight of the composition;

[0134] - 20.0 to 25.0% by weight of octocrylene, ethylhexyl salicylate, butyl methoxydibenzoylmethane, bis-ethylhexyloxyphenol methoxyphenyl triazine and homosalate, based on the total weight of the composition;

[0135] - 10.0 to 15.0% by weight of polydimethylsiloxane, based on the total weight of the composition;

[0136] - water, wherein the weight ratio between water and polydimethylsiloxane is in the range of 1:0.35 to 1:0.50;

[0137] - 0.1 to 2.0% by weight of propylene glycol, based on the total weight of the composition;

[0138] -1.0 to 3.0% magnesium sulfate and caffeine;

[0139] - 0.1 to 2.0% of disteardimonium hectorite;

[0140] -0.1 to 1.5% phenoxyethanol;

[0141] - 1.0 to 5.0 wt. % of vinyl dimethicone / methicone silsesquioxane crosspolymer, based on the total weight of the composition;

[0142] - 0.1 to 3.0 wt. % of polyglyceryl-4 diisostearate / polyhydroxystearate / sebacate and PEG-30 dipolyhydroxystearate, based on the total weight of the composition;

[0143] - 1.0 to 5.0 wt. % of niacinamide and tocopherol, based on the total weight of the composition; and

[0144] - 5.0 to 15.0 wt. % of propylene glycol and ethanol, based on the total weight of the composition.

[0145] Example

[0146] Examples 1 to 10

[0147] The water-in-oil type cosmetic sunscreen composition according to the prior art is shown in Examples 1 to 5, and suitable water-in-oil type cosmetic sunscreen compositions according to the present invention are shown by Examples 6 to 10, as follows:

[0148]

[0149] Example 11

[0150] Stability testing

[0151] Tests were conducted to evaluate the stability of the water-in-oil cosmetic sunscreen compositions of Examples 8 and 10 of the present invention, in comparison with the stability of the prior art composition of Example 5.

[0152] After manufacture, the compositions are left to stand for 16 to 72 hours in the glass container in which they are contained, and then undergo:

[0153] - 1 week at 55°C;

[0154] - 1 month at 45°C; and

[0155] - 2 months at 45°C.

[0156] After these time periods, the compositions were then subjected to microscopic and macroscopic evaluations to assess their stability and physicochemical behavior.

[0157] The results are shown in Figure 1 、 2 and 3, among which Figure 1 The results relating to the prior art composition of Example 5, and Figure 2 and 3 The results relate to the compositions of the invention according to Examples 8 and 10, respectively.

[0158] As can be seen, the compositions according to Examples 8 and 10 exhibit neither formulation instability nor migration of pigments or polydimethylsiloxane to the surface, whereas the composition of Example 5 is clearly unstable, exhibiting migration behavior of red iron oxide and polydimethylsiloxane, resulting in a silicone supernatant.

Claims

1. A water-in-oil cosmetic sunscreen composition, comprising: (a) 10.0 to 25.0 wt. % of at least one pigment, based on the total weight of the composition; (b) greater than 20.0 to 30.0% by weight, based on the total weight of the composition, of at least one UV filter; (c) 8.0 to 20.0 weight percent of polydimethylsiloxane, based on the total weight of the composition; and (d) Water The weight ratio of water to polydimethylsiloxane is in the range of 1:0.30 to 1:0.

55.

2. The composition according to claim 1, wherein the at least one pigment is chosen from mineral pigments.

3. The composition of claim 2, wherein the at least one pigment is selected from the group consisting of titanium dioxide, iron oxides, and mixtures thereof.

4. The composition of claim 1, wherein the at least one pigment is present in an amount ranging from 10.0 to 20.0 wt %, based on the total weight of the composition.

5. The composition according to claim 1, wherein the at least one UV filter is a mixture of octocrylene, ethylhexyl salicylate, butyl methoxydibenzoylmethane, bis-ethylhexyloxyphenol methoxyphenyl triazine and homosalate.

6. The composition according to claim 1, wherein the amount of the at least one UV filter is in the range of 23.0 to 30.0 wt. %, based on the total weight of the composition.

7. The composition according to claim 1, wherein the amount of polydimethylsiloxane is in the range of 10.0 to 15.0 wt % based on the total weight of the composition.

8. The composition according to claim 1, wherein the weight ratio between water and polydimethylsiloxane is in the range of 1:0.35 to 1:0.

50.

9. The composition of claim 1 , wherein the composition further comprises an additional cosmetically acceptable ingredient selected from the group consisting of active compounds, fillers, preservatives, silicones other than dimethicone, solvents other than water, surfactants, vitamins, and mixtures thereof, wherein the active compound is selected from the group consisting of disodium EDTA, triethanolamine, magnesium sulfate, caffeine, and mixtures thereof.

10. The composition of claim 1, wherein the composition exhibits a sun protection factor (SPF) in the range of 30 to 80.

11. Use of a water-in-oil cosmetic sunscreen composition for manufacturing a cosmetic product for skin application, the composition comprising: (a) 10.0 to 25.0 wt. % of at least one pigment, based on the total weight of the composition; (b) greater than 20.0 to 30.0% by weight, based on the total weight of the composition, of at least one UV filter; (c) 8.0 to 20.0 weight percent of polydimethylsiloxane, based on the total weight of the composition; and (d) Water The weight ratio of water to polydimethylsiloxane is in the range of 1:0.30 to 1:0.

55.

12. Use of a water-in-oil cosmetic sunscreen composition for manufacturing a product for skin care, the composition comprising: (a) 10.0 to 25.0 wt. % of at least one pigment, based on the total weight of the composition; (b) greater than 20.0 to 30.0% by weight, based on the total weight of the composition, of at least one UV filter; (c) 8.0 to 20.0 weight percent of polydimethylsiloxane, based on the total weight of the composition; and (d) Water The weight ratio of water to polydimethylsiloxane is in the range of 1:0.30 to 1:0.

55.

13. Use of a water-in-oil cosmetic sunscreen composition for manufacturing a product for photoprotection of the skin, the composition comprising: (a) 10.0 to 25.0 wt. % of at least one pigment, based on the total weight of the composition; (b) greater than 20.0 to 30.0% by weight, based on the total weight of the composition, of at least one UV filter; (c) 8.0 to 20.0 weight percent of polydimethylsiloxane, based on the total weight of the composition; and (d) Water The weight ratio of water to polydimethylsiloxane is in the range of 1:0.30 to 1:0.

55.

14. A method for producing a water-in-oil cosmetic sunscreen composition, the composition comprising: (a) 10.0 to 25.0 wt. % of at least one pigment, based on the total weight of the composition; (b) greater than 20.0 to 30.0% by weight, based on the total weight of the composition, of at least one UV filter; (c) 8.0 to 20.0 weight percent of polydimethylsiloxane, based on the total weight of the composition; and (d) Water wherein the weight ratio between water and polydimethylsiloxane is in the range of 1:0.30 to 1:0.55, The method comprises the following steps: i) adding the water, UV filters, dimethicone and optionally further cosmetically acceptable ingredients to a main container at a temperature in the range of 20 to 60°C, ii) adding the at least one pigment to the main container at a temperature in the range of 25 to 30°C.

Images