FR3151487A3 - COSMETIC COMPOSITION, USE OF THE COSMETIC COMPOSITION AND PROCESS FOR MANUFACTURING THE COSMETIC COMPOSITION - Google Patents

Abstract

COSMETIC COMPOSITION, USE OF THE COSMETIC COMPOSITION AND PROCESS FOR MANUFACTURING THE COSMETIC COMPOSITION The present invention relates to a cosmetic composition comprising (a) iron oxides selected from yellow, black and red iron oxides, (b) titanium oxide; (c) a mixture of niacinamide, tranexamic acid, hydroxyethylpiperazine ethanesulfonic acid; and (d) at least one UV filter. The present invention also relates to the use of the cosmetic composition for homogenizing the skin, treating hyperpigmentation and photoprotecting skin tones 1 to 6 (Fitzpatrick scale) and to the process for manufacturing the cosmetic composition. Figure for the abstract: none

Description

COSMETIC COMPOSITION, USE OF THE COSMETIC COMPOSITION AND PROCESS FOR MANUFACTURING THE COSMETIC COMPOSITION FIELD OF THE INVENTION

The present invention relates to a cosmetic composition comprising (a) iron oxides selected from yellow, black and red iron oxides, (b) titanium oxide; (c) a mixture of niacinamide, tranexamic acid, hydroxyethylpiperazineethanesulfonic acid and (d) at least one UV filter. The present invention also relates to the use of the cosmetic composition for homogenizing the skin, treating hyperpigmentation and photoprotecting skin tones 1 to 6 (Fitzpatrick scale) and to the method for manufacturing the cosmetic composition.

CONTEXT OF THE INVENTION

Widely used to protect the skin from sun damage, cosmetic sunscreen compositions constitute a large share of the market.

Due to the high demand for multi-benefit products, offering different benefits in the same product, consumers are always looking for products that provide high UV protection with a makeup effect and medium to high coverage and that adapt to various skin tones and undertones.

Among the scales to access the skin type of subjects, an example is the Fitzpatrick scale. In particular, a phototype 1 of said scale is associated with very light skin, red or blond hair, blue or green eyes and skin that always burns and/or never tans in the sun, phototype 5 is commonly associated with dark brown skin, brown or black hair, brown eyes and skin that browns easily and rarely burns when exposed to the sun, and phototype 6 is commonly associated with black skin, black hair, dark brown eyes and skin that does not burn when exposed to the sun.

Photoprotection of keratinous materials, including skin and hair, is considered of great importance in order to protect against sun damage, sunburn, photoaging, as well as to reduce the risks of developing skin cancer caused by exposure to ultraviolet (“UV”) rays. There are generally two types of UVA/UVB sunscreen cosmetic compositions used to accomplish photoprotection, namely inorganic UV filters and organic UV filters.

The degree of UV protection provided by a cosmetic composition is directly related to the quantity and type of UV filters it contains. In particular, cosmetic compositions must provide good protection against the sun's rays, measured by the Sun Protection Index (SP) value, a desirable balance between UVA and UVB protection, in particular a minimum UVA protection factor, while presenting a satisfactory sensory perception, such as a smooth and dry touch and a non-greasy sensation upon application.

Along with photoprotection, consumers have a common interest and need for spot camouflage, reduction of spot intensity, skin homogenization, make-up and prevention.

However, in the sunscreen category, the compositions are mainly aimed at skin camouflage and prevention with tinted photoprotection formulas. In this sense, it is necessary to develop compositions that work on the three pathways of skin tone management (skin homogenization, spot treatment and prevention against UVA/UVB and visible light) in a single product for their daily routine.

In other words, the inventors observed the need to simultaneously ensure the homogenization and camouflage of spots, the treatment of skin hyperpigmentation and the protection of the skin against UVA/UVB rays and visible light.

Thus, the aim of the invention is to provide a cosmetic composition by which the consumer can actually benefit from different perspectives of spot treatment, achieving high clinical performance after periodic use in terms of size, intensity and reduction in the number of spots; providing protection against visible light; providing instant camouflage of marks and also providing photoprotection.

Among the disadvantages of the state of the art, besides the known challenges of developing a cosmetic composition with UV filters (chemical protection) and a high concentration of pigments (physical protection) due to the stability of the formulas and the good matching of skin tones with the tinted product, there is an additional market challenge of providing a single stable routine product to homogenize and camouflage spots, treat skin hyperpigmentation and protect the skin from UVA/UVB rays and visible light.

1. homogénéisation de la peau et camouflage des taches,
2. traitement de la peau, et
3. protection solaire/prévention par deux voies complémentaires (protection UVB/UVA et protection contre la lumière visible).

Therefore, the inventors of the present invention have surprisingly succeeded in developing a stable cosmetic composition to cover the three main parameters for skin tones 1 to 6:

1. homogenization of the skin and camouflage of spots,
2. skin treatment, and
3. sun protection/prevention through two complementary pathways (UVB/UVA protection and protection against visible light).

The present invention relates to a cosmetic composition comprising (a) iron oxides chosen from yellow, black and red iron oxides, (b) titanium oxide; (c) a mixture of niacinamide, tranexamic acid, hydroxyethylpiperazineethanesulfonic acid and (d) at least one UV filter.

The present invention also relates to the use of the cosmetic composition for homogenizing the skin, treating hyperpigmentation and photoprotecting skin tones 1 to 6 (Fitzpatrick scale) and to the method of manufacturing the cosmetic composition.

Other features and advantages of the present invention will become apparent from the following more detailed description of desirable embodiments which illustrates, by way of example, the principles of the invention.

There shows the number of spots on the facial skin at the initial stage and after 1 week, 4 weeks and 8 weeks.

There shows the intensity of the skin spot at the initial stage and after 1 week, 4 weeks and 8 weeks.

There shows the uniformity of facial skin tone at the initial stage and after 1 week, 4 weeks and 8 weeks.

There shows a graph of the antioxidant efficacy of the inventive formula of Example 1 relative to sebum alone ( ex vivo photoperoxidation test of sebum at 5 joules UVA/ ^cm2 ).

DETAILED DESCRIPTION OF THE INVENTION

1. d’environ 1 % à environ 20 % en poids d’oxydes de fer choisis parmi les oxydes de fer jaune, noir et rouge ;
2. d’environ 1 à environ 15 % en poids d’oxyde de titane ;

In one embodiment, the cosmetic composition of the present invention comprises:

1. from about 1% to about 20% by weight of iron oxides selected from yellow, black and red iron oxides;
2. from about 1 to about 15% by weight of titanium oxide;

(c) from about 1 to about 30% by weight of a mixture of niacinamide, tranexamic acid, hydroxyethylpiperazine ethanesulfonic acid;

(d) from about 1 to about 40% by weight of at least one UV filter;

including all intermediate ranges and sub-ranges, relative to the total weight of the composition.

In a preferred embodiment, the amount of iron oxides ranges from about 1% to about 20% by weight, preferably from about 5% to about 18% by weight, preferably from about 7% to about 15% by weight of the composition.

The relative weight ratio between iron oxides is:

- from about 30.0 to about 65.0% yellow iron oxide,

- from about 10.0 to about 25.0% red iron oxide, and

- from about 10.0 to about 20.0% black iron oxide.

In a preferred embodiment, the amount of titanium oxide ranges from about 1% to about 14% by weight, preferably from about 3% to about 12% by weight, preferably from about 5% to about 14% by weight of the composition.

In a preferred embodiment, the titanium oxide is titanium dioxide (TiO ₂ ), and the TiO ₂ is only a pigment in the present invention, not a UV filter.

In a preferred embodiment, the amount of the mixture of niacinamide, tranexamic acid, hydroxyethylpiperazine ethanesulfonic acid ranges from about 3% to about 25% by weight, preferably from about 5% to about 22% by weight, preferably from about 7% to about 18% by weight of the composition.

The relative weight ratio between niacinamide, tranexamic acid, hydroxyethylpiperazineethanesulfonic acid is as follows:

- niacinamide ranges from about 0.5 to about 7.0%;

- tranexamic acid ranges from about 0.5 to about 7.0%; and

- hydroxyethylpiperazineethanesulfonic acid ranges from about 0.5 to about 7.0%.

In a preferred embodiment, the amount of the at least one UV filter ranges from about 3% to about 35% by weight, preferably from about 5% to about 30% by weight, preferably from about 7% to about 25% by weight of the composition.

In a preferred embodiment, the UV filter is selected from terephthalylidene dicamphor sulfonic acid, ethylhexyl salicylate, ethylhexyl triazone, bis-ethylhexyloxyphenol methoxyphenyl triazine, drometrizole trisiloxane, diethylamino hydroxybenzoyl hexyl benzoate, butyl methoxydibenzoyl methane and mixtures thereof.

Furthermore, in order to make the actives stable and available in a sunscreen formula, the addition of a mixture of fatty compounds, polymers and solubilizers has been carried out in combination. The solubilization and stabilization of the system comprises the addition/enhancement of a mixture of fatty compounds, polymers and solubilizers in combination. Thus, the composition of the present invention further comprises:

- at least one fatty compound selected from the group consisting of caprylic/capric triglyceride, diisopropyl sebacate, isopropyl lauroyl sarcosinate, stearyl alcohol, isononyl isononanoate and mixtures thereof, in an amount ranging from about 1 to about 30% by weight;

- at least one polymer selected from the group consisting of aluminum starch octenylsuccinate, xanthan gum, acrylates/C _10-30 alkyl acrylate crosslinked polymer, poly(C _10-30 alkyl acrylate), styrene/acrylates copolymer, ammonium acryloyldimethyltaurate/vp copolymer and mixtures thereof, in an amount ranging from about 0.1 to about 20% by weight;

- at least one surfactant selected from the group consisting of potassium cetyl phosphate, sodium methyl stearoyl taurate, inulin lauryl carbamate, glyceryl stearate (and) PEG-100 stearate, poloxamer 338, stearic acid, polyglyceryl-4 diisostearate/polyhydroxystearate/sebacate, PEG-30 dipolyhydroxystearate, and mixtures thereof, in an amount ranging from about 0.1 to about 15% by weight;

- at least one silicone selected from the group consisting of caprylyl methicone, dimethicone, vinyl dimethicone/methicone silsesquioxane cross-linked polymer and mixtures thereof, in an amount ranging from about 0.1 to about 10% by weight; and

- at least one solvent selected from the group consisting of butylene glycol, water, caprylyl glycol, glycerin, pentylene glycol, C _12-15 alkyl benzoate, propanediol, alcohol, propylene glycol and mixtures thereof, in an amount ranging from about 1 to about 50% by weight;

including all intermediate ranges and sub-ranges, relative to the total weight of the composition.

The composition of the present invention provides shades suitable for skin phototypes 1 to 6 (Fitzpatrick scale) and is suitable for the manufacture of different types of cosmetic compositions, such as water-in-oil or oil-in-water emulsions.

The composition of the present invention provides a multi-benefit sunscreen through which the consumer can actually benefit from different perspectives of spot treatment by: achieving high clinical performance after periodic use in terms of size, intensity and reduction in the number of spots; providing protection against visible light; providing instant camouflage of marks and providing photoprotection.

1. d’environ 1 % à environ 20 % en poids d’oxydes de fer choisis parmi les oxydes de fer jaune, noir et rouge ;
2. d’environ 1 à environ 15 % en poids d’oxyde de titane ;
3. d’environ 1 à environ 30 % en poids d’un mélange de niacinamide, d’acide tranexamique, d’acide hydroxyéthylpipérazine éthanesulfonique ;
4. d’environ 1 % à environ 40 % en poids d’au moins un filtre UV ;

The present invention also relates to the use of the cosmetic composition, comprising:

1. from about 1% to about 20% by weight of iron oxides selected from yellow, black and red iron oxides;
2. from about 1 to about 15% by weight of titanium oxide;
3. from about 1 to about 30% by weight of a mixture of niacinamide, tranexamic acid, hydroxyethylpiperazine ethanesulfonic acid;
4. from about 1% to about 40% by weight of at least one UV filter;

including all intermediate ranges and sub-ranges, relative to the total weight of the composition,

for the manufacture of tinted sunscreen products for skin homogenization, treatment of spots and prevention against UVA/UVB and visible light, and suitable for skin phototypes 1 to 6 (Fitzpatrick scale).

Terms

The term “stable” as used herein refers to a physical and/or chemical property of a cosmetic composition, such as a cosmetic composition according to the present invention, which is stable after conducting a 2-month study to withstand 3 years of shelf life (normal conditions) at three different temperatures, such as 4°C, room temperature and 45°C, evaluated at 1 and 2 month time points. In addition, an additional study is conducted for one week at 55°C for stability verification. After this period, physical and/or chemical properties such as appearance, color, odor, pH, viscosity and optical microscopy images are evaluated and must remain satisfactory.

By the term “at least” we mean one or more and this therefore includes individual components as well as mixtures/combinations.

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

The terms “comprising”, “having” and “including” are used in their broad and non-limiting sense.

The compositions and methods of the present invention may 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 useful.

The terms “a,” “an,” “the,” and “the” are understood to include both the plural and the singular. Thus, the phrase “a mixture thereof” also includes “mixtures thereof.” Throughout the disclosure, the phrase “a mixture thereof” is used, following a list of elements as shown in the following example where the letters A through F represent the elements: “one or more elements selected from the group consisting of A, B, C, D, E, F, and a mixture thereof.” The phrase “a mixture thereof” does not require that the mixture include all of the elements A, B, C, D, E, and F (although all of the elements A, B, C, D, E, and F may be included). Rather, it indicates that a mixture of two or more of A, B, C, D, E, and F may be included. In other words, it is equivalent to the formulation "one or more elements selected from the group consisting of A, B, C, D, E, F, and a mixture of two or more of A, B, C, D, E and F".

All percentages, parts and ratios herein are based on the total weight of the compositions of this disclosure, unless otherwise indicated.

Except in working examples or unless otherwise indicated, all numbers expressing quantities of ingredients and/or reaction conditions must be understood as being modified in all cases by the term “approximately” which may include +/- 10%, +/- 8%, +/- 6%, +/- 5%, +/- 4%, +/- 3%, +/- 2%, +/- 1% or +/- 0.5%.

For the purposes of the present invention, the term "water-in-oil composition" and the like means a water-in-oil (W/O) emulsion, also called an inverse emulsion. Similarly, the term "oil-in-water composition" and the like means an oil-in-water (O/W) emulsion.

All components and elements positively stated in the present disclosure may be negatively excluded from the claims. In other words, the compositions of the present disclosure may be free or substantially free of all components and elements positively stated throughout the present disclosure.

Iron oxides

In the context of the present invention, the iron oxides of the cosmetic composition for providing dark shades of the present invention are coated or uncoated iron oxides.

Examples of coated iron oxides that may be mentioned more particularly include aluminum stearoyl glutamate coated iron oxides sold, for example, under the reference NAI by the company Miyoshi Kasei. Other preferred examples of coated iron oxides include iron oxides coated with disodium stearoyl glutamate and aluminum hydroxide. Iron oxides such as CI 77491, CI 77492 and CI 77499 may be used in the present composition and are supplied by TITAN KOGYO.

For the purposes of the present invention, “coating” a pigment generally means the total or partial surface treatment of the pigment with a surfactant, absorbed, adsorbed or grafted onto said pigment.

The coating may represent from about 0.1 to about 20.0% by weight and in particular from about 0.5 to about 5.0% by weight, relative to the total weight of the coated pigment.

The coating can be carried out, for example, by adsorption of a liquid surfactant on the surface of the solid particles by simple mixing with agitation of the particles and said surfactant, optionally with heating, before incorporation of the particles into the other ingredients of the makeup or care composition.

The coating may be achieved, for example, by chemically reacting a surfactant with the surface of the solid pigment particles and creating a covalent bond between the surfactant and the particles. This process is described in particular in US Patent 4,578,266.

Chemical surface treatment may involve diluting the surfactant in a volatile solvent, dispersing the pigments in this mixture, and then slowly evaporating the volatile solvent so that the surfactant is deposited on the surface of the pigments.

The cosmetic composition of the present invention comprises pigments chosen from yellow, black and red iron oxides.

The cosmetic composition of the present invention comprises from about 1.0 to about 30.0 wt. %, from about 5.0 to about 20.0 wt. %, from about 6.0 to about 18.5 wt. %, from about 7.0 to about 17.0 wt. %, from about 10.0 to about 15.5 wt. %, including all intermediate ranges and sub-ranges, based on the total weight of the composition, of yellow, black and red iron oxides.

Further, the cosmetic composition of the present invention may comprise additional pigments.

The term "pigments" is intended to designate white or colored particles, mineral or organic, and which are intended to color and/or opacify the composition and/or the resulting deposit. These pigments may be white or colored, and mineral and/or organic.

The term "mineral pigment" is intended to mean any pigment that meets the definition in Ullmann's Encyclopedia in the chapter on inorganic pigments, with the exception of titanium dioxide pigment. Additional mineral pigments useful in the present invention include zirconium oxide or cerium oxide, and also zinc oxide, additional iron oxides (i.e., other than yellow, red and black iron oxides) or chromium oxide, manganese violet, ultramarine blue, chromium hydrate and ferric blue, and metal powders, for example aluminum powder and copper powder. The following mineral pigments may also be used: Ta ₂ O ₅ , Ti ₃ O ₅ , Ti ₂ O ₃ , TiO, ZrO ₂ as a mixture with ZrO ₂ , Nb ₂ O ₅ , CeO ₂ or ZnS.

Titanium oxides

In the present cosmetic composition, the preferred titanium oxide is titanium dioxide (TiO2), and TiO2 is only a pigment in the present invention, not a UV filter.

As mentioned, the presence of titanium dioxide in cosmetic compositions is associated with the ashy appearance after application to the skin and the white effect, especially in photographs. However, it is important to differentiate titanium dioxide used as a pigment, here called “titanium dioxide pigment”, from titanium dioxide used as a UV filter, here called “titanium dioxide UV filter”.

Titanium dioxide can take several different forms, which have different properties. In particular, the main difference between pigment titanium dioxide and UV filter titanium dioxide is their particle size, with the pigment being larger than the UV filter. At small sizes and low concentrations, titanium dioxide appears as a minimal or non-white residue, allowing for effective sunscreens that do not appear white.

Titanium dioxide pigment is the most widely used white pigment due to its brightness and very high refractive index, which is surpassed by only a few other materials. The crystal size of titanium dioxide pigment is ideally larger than 220 nm, even reaching a micrometer scale, such as about 7,000 nm (measured by electron microscope) to optimize the maximum reflection of visible light. Titanium dioxide pigment is also an effective opacifier in powder form, where it is used as a pigment to provide whiteness and opacity to products such as paints, coatings, plastics, papers, inks, foods, medicines ( i.e., pills and tablets) and most toothpastes. Titanium dioxide pigment is able to scatter light, which allows it to be used more for pigments.

In addition, nanoscale titanium dioxide, which should also be considered herein as a synonym for “UV filter titanium dioxide,” is found in the majority of physical sunscreens due to its high UV light absorption capabilities and resistance to fading under ultraviolet light. This advantage enhances its stability and ability to protect the skin from ultraviolet light. Nanoscale titanium dioxide particles (particle size less than 200 nm) are primarily used in sunscreen compositions because they scatter much less visible light than titanium dioxide pigments and can provide UV protection.

The cosmetic composition of the present invention comprises from about 1.0 to about 15.0 wt. %, from about 5.0 to about 18.0 wt. %, from about 6.0 to about 15.0 wt. %, from about 7.0 to about 12.0 wt. %, from about 8.0 to about 10.0 wt. %, including all intermediate ranges and sub-ranges, based on the total weight of the composition of pigmented titanium oxides.

UV filters

The UV filter of the cosmetic composition of the present invention may be selected from the group consisting of oil-soluble organic sunscreen ingredients and water-soluble organic sunscreen ingredients. Suitable non-limiting organic UV filters of the present invention are described in more detail below.

Organic oil soluble sunscreen ingredient

“Oil-soluble organic sunscreen ingredient” means any organic compound intended to shield UV rays that can be completely dissolved in molecular or miscible form in an oil phase or that can be dissolved in colloidal form (e.g., micellar form) in an oily fatty phase.

Non-limiting examples of oil-soluble organic sunscreen ingredients useful in the invention include, for example, cinnamic derivatives; anthranilates; salicylic derivatives; dibenzoylmethane derivatives; camphor derivatives; benzophenone derivatives; diphenylacrylate derivatives; triazine derivatives; benzotriazole derivatives; benzalmalonate derivatives, particularly those cited in US5624663; benzimidazole derivatives; imidazolines; bis-benzoazolyl derivatives as described in EP669323 and US2463264; p-aminobenzoic acid (PABA) derivatives; methylene bis(hydroxyphenylbenzotriazole) derivatives as described in applications US5237071, US5166355, GB2303549, DE19726184 and EP893119; benzoxazole derivatives as described in patent applications EP0832642, EP1027883, EP1300137 and DE10162844; screen polymers and screen silicones as described in patent application WO 93/04665; alkyl-styrene derived dimers such as those described in patent application DE 19855649; 4,4-diarylbutadienes such as those described in patent applications EP0967200, DE19746654, DE19755649, EP-A-1008586, EP1133980 and EP1133981, merocyanine derivatives such as those described in patent applications WO 04/006878, WO 05/058269 and WO 06/032741; and mixtures thereof.

Examples of other suitable oil-soluble organic sunscreen ingredients include those listed below under their INCI name:

Cinnamic derivatives:

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

Dibenzoylmethane derivatives:

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

Salicylic derivatives:

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

Beta, beta-diphenylacrylate derivatives:

Examples of suitable beta, beta-diphenylacrylate derivatives include, but are not limited to, octocrylene and etocrylene.

Benzophenone derivatives:

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 a mixture with octyl methoxycinnamate.

Benzylidenecamphor derivatives:

Examples of suitable benzylidenecamphor derivatives include, but are not limited to, manufactured 3-benzylidenecamphor, 4-methylbenzylidenecamphor, manufactured polyacrylamidomethyl benzylidenecamphor.

Phenylbenzotriazole derivatives:

Examples of suitable phenylbenzotriazole derivatives include, but are not limited to, drometrizole trisiloxane, methylene bis-benzotriazolyl tetramethylbutyl-phenol, or in micronized form in aqueous dispersion.

Triazine derivatives:

Examples of suitable triazine derivatives include, but are not limited to, bis-ethylhexyloxyphenol methoxyphenyl triazine, ethylhexyl triazone, diethylhexyl butamido triazone, 2,4,6-tris(dineopentyl 4'-aminobenzalmalonate)-s-triazine, 2,4,6-tris(diisobutyl 4'-aminobenzalmalonate)-s-triazine, 2,4-bis(dineopentyl 4'-aminobenzalmalonate)-6-(n-butyl 4'-aminobenzoate)-s-triazine, the symmetrical triazine screen agents described in US Patent 6,225,467, WO 2004/085412 (see compounds 6 and 9) or "Symmetrical Triazine Derivatives" IP.COM Journal, IP.COM Inc., West Henrietta, NY, US (September 20, 2004), in particular 2,4,6-tris(biphenyl)-1,3,5-triazines (in particular 2,4,6-tris(biphenyl-4-yl)-1,3,5-triazine and 2,4,6-tris(terphenyl)-1,3,5-triazine), which are included in patent applications WO/06/035000, WO 06/034982, WO 06/034991, WO 06/035007, WO 2006/034992 and WO 2006/034985).

Anthranilic derivatives:

An example of a suitable anthranilic derivative includes, but is not limited to, menthyl anthranilate.

Imidazoline derivatives:

An example of a suitable imidazoline derivative includes, but is not limited to, ethylhexyl dimethoxybenzylidene dioxoimidazoline propionate.

Benzalmalonate derivatives:

An example of a suitable benzalmalonate derivative includes, but is not limited to, a polyorganosiloxane containing benzalmalonate functions, for example polysilicone-15.

4,4-Diarylbutadiene derivatives:

An example of a suitable 4,4-diarylbutadiene derivative includes, but is not limited to, 1-Dicarboxy(2,2'-dimethylpropyl)-4,4-diphenyl-butadiene.

Benzoxazole derivatives:

An example of a suitable benzoxazole derivative includes, but is 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.

Water soluble organic sunscreen ingredient

“Water-soluble organic sunscreen ingredient” means any organic compound intended to shield UV radiation that is completely soluble in molecular or miscible form in a liquid aqueous phase or that is soluble in colloidal form (e.g., micellar form) in a liquid aqueous phase.

Non-limiting examples of water-soluble organic sunscreen ingredients useful in the invention include, for example, terephthalylidene dicamphor sulfonic acid, phenylbenzimidazole sulfonic acid (Ensulizole), benzophenone-4, aminobenzoic acid (PABA), 4-bis(polyethoxy)-para-aminobenzoic acid polyethoxyethyl ester (PEG-25 PABA), benzalkonium camphor methosulfate, methylene bis-benzotriazolyl tetramethylbutylphenol (Bisoctrizole), disodium phenyl dibenzimidazole tetrasulfonate (Bisdisulizole disodium) and tris-biphenyl triazine; their derivatives and corresponding salts; naphthalene bisimide derivatives such as those described in European Patent Application EP1990372 A2; and cationic salts and quaternary derivatives of cinnamido amine such as those described in U.S. Patent 5,601,811.

The salts of the compounds which can be used according to the invention are chosen in particular from alkali metal salts, for example sodium or potassium; alkaline earth metal salts, for example calcium, magnesium or strontium; metal salts, for example zinc, aluminum, manganese or copper; ammonium salts of formula NH4+; quaternary ammonium salts; organic amine salts, for example methylamine, dimethylamine, trimethylamine, triethylamine, ethylamine, 2-hydroxyethylamine, bis(2-hydroxyethyl)amine or tris(2-hydroxyethyl)amine salts; lysine or arginine salts. Salts chosen from sodium, potassium, magnesium, strontium, copper, manganese or zinc salts are preferably used. The sodium salt is preferably used.

In a preferred embodiment, the at least one UV filter of the cosmetic composition of the present invention is selected from the group consisting of octocrylene, diethylamino hydroxybenzoyl hexyl benzoate (provided by BASF), ethylhexyl salicylate, ethylhexyl triazone, butyl methoxydibenzoylmethane, titanium dioxide UV filter, bis-ethylhexyloxyphenol methoxyphenyl triazine, homosalate and mixtures thereof.

In a preferred embodiment, the amount of the at least one UV filter in the cosmetic composition of the present invention ranges from about 1.0 to about 40.0 wt. %, from about 10.0 to about 30.0 wt. %, from about 15.0 to about 25.0 wt. %, from about 16.0 to about 24.0 wt. %, from about 17.0 to about 23.0 wt. %, from about 18.0 to about 22.0 wt. %, including all ranges and sub-ranges, relative to the total weight of the composition.

Additional Ingredients

In addition to the essential components described above, the cosmetic composition of the present invention may further comprise any usual cosmetically acceptable ingredient, which may be chosen in particular from additional pigments, active compounds, fatty compounds, fillers, perfumes/flavors, polymers, preservatives and/or chelating agents, solvents, surfactants, vitamins, silicones, plant extracts and mixtures thereof.

A person skilled in the art will take care to select the optional additional ingredients and/or their quantity so that the advantageous properties of the composition according to the invention are not, or not significantly, compromised by the envisaged addition.

In a preferred embodiment, additional ingredients of the cosmetic composition of the present invention are selected from the group consisting of hydrolyzed rice proteins (provided by SILAB), magnesium sulfate, caffeine, Citrus limon (lemon) fruit extract and mixtures thereof.

In a preferred embodiment, the filler of the cosmetic composition of the present invention is selected from silica, silica silylate, disteardimonium hectorite, polylactic acid, mica and kaolin.

The water used may be sterile demineralized water and/or deionized water and/or floral water such as rose water, cornflower water, chamomile water or lime blossom water, and/or natural thermal or mineral water such as, for example: Vittel water, Vichy basin water, Uriage water, La Roche Posay water, La Bourboule water, Enghien-les-Bains water, Saint Gervais-les-Bains water, Néris-les-Bains water, Allevar-les-Bains water, Digne water, Maizières water, Neyrac-les-Bains water, Lons-le-Saunier water, Eaux-Bonnes water, Rochefort water, Saint Christau water, Fumades water, Tercis-les-Bains water or Avène water. The water may also include reconstituted thermal water, i.e. water containing trace elements such as zinc, copper, magnesium, etc., reconstituting the characteristics of thermal water.

In a preferred embodiment, the active compounds of the cosmetic composition of the present invention are selected from tranexamic acid (provided by SPECCHEM INDUSTRY), hydroxyethylpiperazineethanesulfonic acid, hydroxyacetophenone (provided by SYMRISE), citric acid, trisodium ethylenediamine disuccinate (provided by INNOSPEC), triethanolamine and mixtures thereof.

In a preferred embodiment, the vitamin of the cosmetic composition of the present invention is selected from ascorbyl glucoside, tocopherol and mixtures thereof.

In a preferred embodiment, the silicone of the cosmetic composition of the present invention is selected from caprylyl methicone (provided by DOW), dimethicone, vinyl dimethicone/methicone silsesquioxane crosslinked polymer, and mixtures thereof.

In a preferred embodiment, the preservative and/or chelating agent of the cosmetic composition of the present invention is chosen from phenoxyethanol, chlorphenesin, disodium EDTA and mixtures thereof.

The composition of the present invention further comprises at least one compound selected from the group consisting of hydroxyacetophenone, citric acid, trisodium ethylenediamine disuccinate, triethanolamine and mixtures thereof.

In a preferred embodiment, the cosmetically acceptable additional ingredient of the cosmetic composition of the present invention ranges from about 0.1 to about 25.0 wt. %, from about 4.0 to about 20.0 wt. %, from about 6.0 to about 18.0 wt. %, from about 7.0 to about 10.0 wt. %, inclusive of all intermediate ranges and sub-ranges, based on the total weight of the composition.

PROCESS FOR MANUFACTURING A MULTI-BENEFIT LEAVE-IN HAIR COSMETIC COMPOSITION

The skilled person would be able to select suitable processes for manufacturing a cosmetic composition according to the needs. However, a suitable process for manufacturing a cosmetic composition comprises the following steps:

Step (A): Main tank – hot oil phase comprising oily raw materials at a temperature ranging from 75ºC to 80ºC;

Step (B): Secondary tank – Aqueous phase at room temperature or 75-80 ºC comprising aqueous raw materials;

Step (C): The aqueous phase of step (B) is added to the oil phase of step (A), after which the emulsifier is then added and the mixture is mixed; and

Step (D): followed by neutralization;

Step (E): The fillers are gradually added to the mixture obtained in step (D) and mixed until homogeneous, at a temperature below 30 ºC.

METHODS OF IMPLEMENTATION

An example of a suitable cosmetic composition according to the present invention comprises:

(a) from about 1% to about 20% by weight of iron oxides selected from yellow, black and red iron oxides;

(b) from about 1 to about 15% by weight of titanium dioxide;

(c) from about 1 to about 30% by weight of a mixture of niacinamide, tranexamic acid, hydroxyethylpiperazine ethanesulfonic acid;

(d) from about 1 to about 40% by weight of at least one UV filter;

including all intermediate ranges and sub-ranges, relative to the total weight of the composition.

Another example of a suitable cosmetic composition according to the present invention comprises:

(a) from about 1% to about 20% by weight of iron oxides selected from yellow, black and red iron oxides;

(b) from about 1 to about 15% by weight of titanium dioxide;

(c) from about 1 to about 30% by weight of a mixture of niacinamide, tranexamic acid, hydroxyethylpiperazine ethanesulfonic acid, wherein:

- niacinamide ranges from about 1 to about 20% by weight;

- tranexamic acid ranges from about 0.05 to about 5% by weight; and

- hydroxyethylpiperazineethanesulfonic acid ranges from about 0.05 to about 5% by weight;

d) from about 1 to about 40% by weight of at least one UV filter selected from terephthalylidene dicamphor sulfonic acid, ethylhexyl salicylate, ethylhexyl triazone, bis-ethylhexyloxyphenol methoxyphenyl triazine, drometrizole trisiloxane, diethylamino hydroxybenzoyl hexyl benzoate, butyl methoxydibenzoyl methane, and mixtures thereof;

including all intermediate ranges and sub-ranges, relative to the total weight of the composition.

EXAMPLES

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

Suitable cosmetic compositions according to the present invention are as in Inventive Examples 1 and 2, as follows:

Inventive example 1

Function/type Ingredient Ex. 1 Vitamins Niacinamide 7.1% Tocopherol Scent Scent 0.8 - 1.0% UV filter system Butyl methoxydibenzoyl
Methane 22.5% Ethylhexyl salicylate Ethylhexyl triazone Terephthalylidene dicamphor sulfonic acid Drometrizole trisiloxane Bis-ethylhexyloxyphenol methoxyphenyl triazine Diethylamino hydroxybenzoyl hexyl benzoate Polymer Crosslinked polymer of acrylates/C10-C30 alkyl acrylate 4.35% Xanthan gum Polyalkyl acrylate C _10-30 Aluminum Starch Octenylsuccinate Active compounds Triethanolamine 3.6% Hydroxyethylpiperazine ethanesulfonic acid Trisodium ethylenediamine disuccinate Hydroxyacetophenone Tranexamic Acid Citric acid Solvent Pentylene glycol 7.23% Caprylyl Glycol Butylene glycol C12-C15 Alkyl Benzoate Glycerin Fat compound Diisopropyl sebacate 5% Isopropyl lauroyl sarcosinate Stearyl alcohol Caprylic/capric triglyceride OTHERS Caprylyl methicone 6.6% Hydrolyzed rice protein Silica Pigment system Iron oxide
TiO ₂ 10% Solvent Water QS Surfactant Sodium methyl stearoyl taurate 3.5% Inulin lauryl carbamate Potassium cetyl phosphate

Inventive example 2

Function/type Ingredient Ex. 2 Vitamin Niacinamide 7.1% Tocopherol Scent Scent 0.5% - 0.8% Polymer Aluminum Starch Octenylsuccinate 4.35% Poly(C10-30 alkyl acrylate) Xanthan gum Crosslinked polymer of acrylates/C10-C30 alkyl acrylate UV filter system Butyl methoxydibenzoyl
Methane 22.5% Ethylhexyl salicylate Ethylhexyl triazone Terephthalylidene dicamphor sulfonic acid Drometrizole trisiloxane Bis-ethylhexyloxyphenol methoxyphenyl triazine Diethylamino hydroxybenzoyl hexyl benzoate Surfactant Sodium methyl stearoyl taurate 3.5% Inulin lauryl carbamate Potassium cetyl phosphate Solvent Glycerin 7.53% Butylene glycol Pentylene glycol Caprylyl Glycol C12-C15 Alkyl Benzoate Fatty compound Isopropyl lauroyl sarcosinate 5% Stearyl alcohol Caprylic/capric triglyceride Diisopropyl sebacate OTHERS Caprylyl methicone 6.6% Hydrolyzed rice protein Silica Active compound
Trisodium ethylenediamine disuccinate 3.6% Hydroxyacetophenone Tranexamic Acid Citric acid Triethanolamine Hydroxyethylpiperazine ethanesulfonic acid Pigment system Iron oxides 10% Iron oxides Iron oxides Titanium oxide Solvent Water QS

Comparative example 3 (state of the art)

A comparative cosmetic composition according to the state of the art is described by Example 3, as follows:

Ingredient Function/type Ex. 3 Vitamin Tocopherol 0.1% Scent Scent 1% Solvent Water QS Polymer Aluminum Starch Octenylsuccinate 6.25% Xanthan gum Crosslinked polymer of acrylates/C _10-30 alkyl acrylate Polyalkyl acrylate C _10-30 Styrene/acrylates copolymer Active compound
Triethanolamine 1.52% Neohesperidin dihydrochalcone Disodium Edta Capryloyl salicylic acid UV filter system Ethylhexyl salicylate 29% Ethylhexyl triazone Terephthalylidene dicamphor sulfonic acid Drometrizole trisiloxane Octocrylene Homosalate Bis-ethylhexyloxyphenol methoxyphenyl triazine Butyl methoxydibenzoylmethane Solvent Pentylene glycol 5.5% Caprylyl Glycol C _12-15 Alkyl Benzoate Fatty compound and surfactants
Isopropyl lauroyl sarcosinate 4.8% Stearyl alcohol Sodium methyl stearoyl taurate Inulin lauryl carbamate Potassium cetyl phosphate Pigment system Titanium dioxide 10% Iron oxides Iron oxides Iron oxides OTHERS Caprylyl methicone 8.4% Zingiber officinalis (ginger) root extract (and) sanguisorba officinalis root extract (and) cinnamomum cassia bark extract Dipotassium glycyrrhizate Silica Dimethicone Phenoxyethanol Phenoxyethanol Polylactic acid

TESTS AND RESULTS

Test 1 - Sebum photoperoxidation test ex vivo (Comparison of the antioxidant efficacy of the formula of inventive example 1 compared to untreated sebum (control))

I. Objective

The objective was to evaluate the antioxidant effect of the formula of inventive example 1 compared to untreated sebum alone, by UVA peroxidation of the sebum “ ex vivo ”.

The inventors verified that the formula of inventive example 1 was effective against untreated sebum, which is observed by an inhibition of sebum peroxidation of approximately 80% under our test conditions.

II. Test conditions

A layer of sebum is taken from the forehead of a volunteer on 2 inert supports. Approximately 3 mg/cm2 of the active formula to be tested is applied to the first sample, without applying anything to the second sample (untreated sebum control).

The samples are exposed to UVA at 5 joules/ ^cm2 . Photo-oxidation of sebum leads to the formation of squalene peroxides, and the variation in peroxidation allows us to compare the effectiveness of the active formula compared to sebum alone (see ).

III. Results

The results of the effectiveness of the formula of inventive example 1 compared to sebum alone are summarized in Table 1 below:

[Table 1] Table 1 – Effectiveness of the formula of example 1 compared to sebum alone UVA exposure 5 joules/cm² SQOOH in pmoles/µg of SQ inhibition Witness 940576/22 test 1 206 ± 8.7 39 ± 2 84 ± 3 % test 2 308 ± 13 40 ± 0.9

IV. Review of results

The protection provided by the formula of inventive example 1 is effective, with an inhibition of approximately 80% compared to untreated sebum.

The degree of effectiveness can be explained by the combined effect of UVA protection and antioxidant protection.

Test 2 – Study to evaluate pigment control and anti-spots

The protocol involved testing 5 shades on (i) all skin tones and (ii) all skin types over 8 weeks.

After the said 8 weeks, the results obtained revealed:

- with respect to skin tone management, the inventors observed surprisingly positive results related to clinical skin tone management for skin tones 1 to 6. The positive results show a reduction of (i) 22% in the number of spots; (ii) 46% in the intensity of spots; and (iii) 34% in the size of spots and a 35% improvement in skin radiance;

- regarding the prevention of spots, the results were observed after 5 days, with an SPF = 71.8 (6.7) + protection against visible light; and

- as regards instant camouflage of marks on different phototypes, the inventors have also observed improved results compared to prior art products.

The progress and improvements described above can be seen on the (number of spots), the (color intensity of the stain) and the (uniformity of complexion).

Test 3 – Clinical study (Evaluation of the protective effects of four sunscreens on pigmentation induced by visible light compared to an untreated control area)

Main objective:

To evaluate the protective effect of the inventive sunscreen composition to prevent visible light-induced pigmentation.

Secondary objective:

To assess local tolerance and overall tolerability of test products based on the reporting of adverse reactions.

Methodology/study design:

This was a single-center, double-blind, randomized, controlled study with intra-individual comparisons.

The study consisted of a screening visit followed by six (6) assessment visits (Day 1, Day 2, Day 3, Day 4, Day 5 and Day 12). The study was conducted as follows:

A 3-week pre-screening period (within three (3) weeks prior to the baseline visit): Prior to any study procedures, subjects were provided with necessary written and oral information, including the informed consent form. Eligibility was to be determined by physical examination and confirmation of all inclusion/non-inclusion criteria.

On Day 1, five (5) test areas were to be delineated on each side of the spine in the mid-back. Each test area consisted of an exposed portion (EZ) and a surrounding unexposed portion (NEZ). Two (2) duplicate baseline colorimetric measurements were to be performed on both portions for each test area. The investigator was also to perform a clinical assessment of erythema and pigmentation for each test area and take standardized photographs.

After the rest period was over, the five (5) test areas were exposed to a visible light dose of 144J/cm².

From Day 2 to Day 4, the investigator was required to perform double baseline colorimetric measurements (for each test area and surrounding skin), perform a clinical assessment of erythema and pigmentation for each test area.

After the rest period was over, the five (5) test areas were exposed to a visible light dose of 144J/cm².

On Day 4 only, a standardized photograph of the five (5) test areas was taken.

At Day 5 and Day 12/End of study, the investigator was required to perform duplicate baseline colorimetric measurements (for each test area and surrounding skin), perform a clinical assessment of erythema and pigmentation for each test area, and take a standardized photograph for all five (5) test areas.

Number of subjects (planned and analyzed):

Planned: 20; Shortlisted: 20; Engaged: 20; Completed: 20; and Analyzed: 20.

Diagnosis and main inclusion criteria:

Subjects included in this study were healthy Caucasian subjects of both sexes aged 18 to 50 years, with skin type IIIb to V according to the Fitzpatrick scale (1) and with an ITA° between -20 and 28° at preselection.

Evaluation criteria: Main evaluation criterion:

Pigmentation intensity measured by the colorimetric angle of the ITA° (between ZE and NEZ).

Secondary evaluation criteria:

 Pigmentation intensity measured by delta E between EZ and NEZ,

 Colorimetric parameters (delta L*, delta a* and delta b*),

 Clinical assessment of pigmentation,

 Clinical assessment of erythema,

 Visible light protection factors (VL-PF).

Safety assessments:

 Local tolerance

 General safety: Adverse events reported continuously.

Main statistical methods: Analysis of effects over time:

Data were analyzed using a mixed-effects model. This model included time, treatment, time*treatment interaction, and baseline as fixed effects.

Subject was added as a random effect. Comparisons between post-baseline and baseline for each treatment were made regardless of interaction outcomes using a Dunnett adjustment.

Degrees of freedom for comparisons were approximated by the Kenward-Roger method.

Analysis of treatment effects:

Change from baseline was analyzed using a mixed-effects model. This model included time, treatment, treatment*interaction time, and baseline as fixed effects. Subject was added as a nested random effect. Comparison between the two treatments at each measurement point was performed regardless of the interaction outcome using a Tukey adjustment. Degrees of freedom for comparisons were approximated by the Kenward-Roger method.

Summary of results:

The study was conducted as planned according to the protocol and no protocol deviations were observed.

Results in terms of effectiveness:

Under the conditions of the present study, the analysis of the primary evaluation criterion (Delta ITA) led to the following conclusions:

 Significant decreases in delta ITA° from baseline were observed from Day 2 for all test areas.

 Significant differences were observed between all areas treated with the tested formulations and the untreated ones from Day 2.

Similar results were observed with the colorimetric parameter Delta L*. The same was true for Delta E although the results obtained were less pronounced.

Analysis of clinical assessment of skin pigmentation corroborates colorimetric measurements.

The highest protection factors were provided by the formula in Example 1 (39%).

General conclusions:

In conclusion, under the study conditions, all four formulations tested were effective against visible light-induced pigmentation. The formula in Example 2 provided the best protective effects and its safety profile was excellent.

Claims (8)

Cosmetic composition comprising:
(a) from 1% to 20% by weight of iron oxides chosen from yellow, black and red iron oxides;
(b) from 1 to 15% by weight of titanium oxide;
(c) from 1 to 30% by weight of a mixture of niacinamide, tranexamic acid, hydroxyethylpiperazine ethanesulfonic acid;
(d) from 1 to 40% by weight of at least one UV filter;
including all intermediate ranges and sub-ranges, relative to the total weight of the composition. The composition of claim 1, wherein the at least one titanium oxide is titanium dioxide. Composition according to claim 1, in which the at least one UV filter is chosen from terephthalylidene dicamphor sulfonic acid, ethylhexyl salicylate, ethylhexyl triazone, bis-ethylhexyloxyphenol methoxyphenyl triazine, dromethorizole trisiloxane, diethylamino hydroxybenzoyl hexyl benzoate, butyl methoxydibenzoyl methane and mixtures thereof. The composition of claim 1, wherein the composition further comprises at least one compound selected from the group consisting of hydroxyacetophenone, citric acid, trisodium ethylenediamine disuccinate, triethanolamine and mixtures thereof. The composition of claim 1, wherein the composition further comprises:
- at least one fatty compound selected from the group consisting of caprylic/capric triglyceride, diisopropyl sebacate, isopropyl lauroyl sarcosinate, stearyl alcohol, isononyl isononanoate, and mixtures thereof, in an amount ranging from 1 to 30% by weight, including all intermediate ranges and sub-ranges, relative to the total weight of the composition; and/or
- at least one polymer selected from the group consisting of aluminum starch octenylsuccinate, xanthan gum, acrylates/C _{10-30 alkyl acrylate crosslinked polymer,} poly(C _10-30 alkyl acrylate), styrene/acrylates copolymer, ammonium acryloyldimethyltaurate/vp copolymer, and mixtures thereof, in an amount ranging from 0.1 to 20% by weight, inclusive of all intermediate ranges and sub-ranges, relative to the total weight of the composition; and/or
- at least one surfactant selected from the group consisting of potassium cetyl phosphate, sodium methyl stearoyl taurate, inulin lauryl carbamate, glyceryl stearate (and) PEG-100 stearate, poloxamer 338, stearic acid, polyglyceryl-4 diisostearate/polyhydroxystearate/sebacate, PEG-30 dipolyhydroxystearate, and mixtures thereof, in an amount ranging from 0.1 to 15% by weight, inclusive of all intermediate ranges and sub-ranges, relative to the total weight of the composition; and/or
- at least one silicone selected from the group consisting of caprylyl methicone, dimethicone, vinyl dimethicone/methicone silsesquioxane cross-linked polymer, and mixtures thereof, in an amount ranging from 0.1 to 10% by weight, including all intermediate ranges and sub-ranges, relative to the total weight of the composition; and/or
- at least one solvent selected from the group consisting of butylene glycol, water, caprylyl glycol, glycerin, pentylene glycol, C _12-15 alkyl benzoate, propanediol, alcohol, propylene glycol, and mixtures thereof, in an amount ranging from 1 to 50% by weight, including all intermediate ranges and sub-ranges, relative to the total weight of the composition. A composition according to claim 1, wherein it further comprises cosmetically acceptable ingredients selected from additional pigments, active compounds, fatty compounds, fillers, fragrance/flavor, polymers, preservatives, solvents, emollients, surfactants, vitamins, silicones and mixtures thereof. Use of the cosmetic composition, comprising:
(a) from 1% to 20% by weight of iron oxides selected from yellow, black and red iron oxides;
(b) from 1 to 15% by weight of titanium oxide;
(c) from 1 to 30% by weight of a mixture of niacinamide, tranexamic acid, hydroxyethylpiperazine ethanesulfonic acid;
(d) from 1 to 40% by weight of at least one UV filter;
including all intermediate ranges and sub-ranges, relative to the total weight of the composition,
in which it is intended for the manufacture of tinted sunscreen products for skin homogenization, treatment of spots and prevention of UVA/UVB and visible light, and is suitable for skin phototypes 1 to 6 (Fitzpatrick scale). Process for manufacturing the cosmetic composition, comprising:
(a) from 1% to 20% by weight of iron oxides selected from yellow, black and red iron oxides;
(b) from 1 to 15% by weight of titanium oxide;
(c) from 1 to 30% by weight of a mixture of niacinamide, tranexamic acid, hydroxyethylpiperazine ethanesulfonic acid;
(d) from 1 to 40% by weight of at least one UV filter;
including all intermediate ranges and sub-ranges, relative to the total weight of the composition.
the method comprising the following steps:
Step (A): Main tank – hot oil phase comprising oily raw materials at a temperature ranging from 75ºC to 80ºC;
Step (B): Secondary tank – Aqueous phase at room temperature or 75-80 ºC comprising aqueous raw materials;
Step (C): The aqueous phase of step (B) is added to the oil phase of step (A), after which the emulsifier is then added and the mixture is mixed; and
Step (D): followed by neutralization;
Step (E): The fillers are gradually added to the mixture obtained in step (D) and mixed until homogeneous, at a temperature below 30 ºC.