FR3142903A1 - Cosmetic sunscreen composition and use of a cosmetic sunscreen composition - Google Patents

Abstract

COSMETIC sunscreen composition AND Use of a COSMETIC sunscreen composition The present invention relates to cosmetic sunscreen compositions comprising (a) emulsified carnauba wax, (b) one or more organic UV filters, (c) one or more surfactants, and (d) one or more polymers. The present invention also relates to the use of a cosmetic sunscreen composition. Figure for the abstract: none

Description

COSMETIC sunscreen composition AND Use of a COSMETIC sunscreen composition FIELD OF THE INVENTION

The present invention relates to cosmetic sunscreen compositions comprising (a) emulsified carnauba wax, (b) one or more UV filters, (c) one or more surfactants, and (d) one or more polymers. The present invention also relates to the use of a cosmetic sunscreen composition.

CONTEXT OF THE INVENTION

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”) radiation. There are generally two types of UVA/UVB cosmetic sunscreen compositions used to accomplish photoprotection, namely inorganic UV filters and organic UV filters.

The degree of UV protection provided by a sunscreen composition is directly linked to the quantity and type of UV filters contained in it. The higher the quantity of UV filters, the higher the degree of UV protection (UVA/UVB).

In particular, sunscreen compositions must provide good protection against the sun, one measure of which is the Sun Protection Index (SPI) value, while having a satisfactory sensory perception, such as a smooth but non-greasy feel upon application. This combination of properties has typically been achieved with SPF boosters, particularly using microscopic plastic particles.

The formulation of environmentally friendly cosmetic products, which are designed and developed with environmental issues in mind, is becoming a major objective in an effort to address global challenges.

It is therefore essential to offer more sustainable compositions, preparation processes and ingredients to address these environmental concerns.

In this context, it is important to develop new cosmetic compositions with a better carbon footprint, in particular by promoting the use of materials of natural origin while reducing the use of compounds of petrochemical origin.

One of the commonly used ingredients for cosmetic sunscreen compositions is styrene/acrylates copolymer, microscopic plastic particles that act as an SPF booster. However, there is growing concern about the use of microplastics in cosmetic compositions due to their potential environmental impact. Studies indicate that microplastics can be absorbed into cells and can also contaminate other animal tissues and water.

For these reasons, there is a need to develop new oil-in-water cosmetic sunscreen compositions that are stable, exhibit good sensory properties and offer high SPF without the use of microplastics.

The inventors of the present invention have surprisingly succeeded in developing an oil-in-water cosmetic sunscreen composition with a high SPF, with a satisfactory balance between UVA and UVB protection, with good sensory attributes and stability that is free from microplastics by incorporating emulsified carnauba wax.

The present invention relates to cosmetic sunscreen compositions comprising (a) emulsified carnauba wax, (b) one or more UV filters, (c) one or more surfactants, and (d) one or more polymers. The present invention also relates to the use of a cosmetic sunscreen composition.

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

DETAILED DESCRIPTION OF THE INVENTION

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

(a) emulsified carnauba wax;

(b) one or more organic UV filters;

(c) one or more surfactants selected from stearic acid, glyceryl stearate, PEG-100 stearate, potassium cetyl phosphate, poloxamer 338, glyceryl oleate, sodium methyl stearoyl taurate, isotridecyl phosphate, laureth-23, PEG-8 laurate, sodium dodecylbenzenesulfonate, glyceryl oleate, combinations thereof; and

(d) one or more polymers selected from C _12-22 alkyl acrylate/hydroxyethyl acrylate copolymer, ammonium acryloyldimethyltaurate/VP copolymer, sodium polyacrylate, carbomer, aluminum starch octenylsuccinate, acrylates/C _10-30 alkyl acrylate crosslinked polymer, acrylates/dimethicone copolymer and combinations thereof.

In a preferred embodiment, the amount of emulsified carnauba wax in the cosmetic sunscreen composition of the present invention is from about 0.5% to about 15.0% by weight, preferably from about 1.0% to about 5.0% by weight, such as from about 2.0% to about 4.0% by weight, inclusive of all intermediate ranges and sub-ranges, based on the total weight of the cosmetic sunscreen composition.

In one embodiment, the one or more surfactants range from 0.01 to about 10.0 wt. %, from about 0.05% to about 4.5 wt. %, from about 0.1 to about 4.0 wt. %, including all intermediate ranges and sub-ranges, based on the total weight of the cosmetic sunscreen composition.

In one embodiment, the polymer(s) range from about 0.01% to about 10.0% by weight, including about 1.0% to about 6.0% by weight, about 1.5% to about 5.0% by weight, about 2.0% to about 4.0% by weight, including all intermediate ranges and subranges, relative to the total weight of the cosmetic sunscreen composition.

In another embodiment, the cosmetic sunscreen composition of the present invention further comprises cosmetically acceptable ingredients selected from fragrances/perfumes, additional solvents, active compounds, vitamins, fillers, emollients, silicones, pigments and combinations thereof. In a preferred embodiment, the cosmetic sunscreen composition of the present invention further comprises water as a solvent.

Preferably, the cosmetic sunscreen composition of the present invention is an oil-in-water composition.

In a preferred embodiment, the cosmetic sunscreen composition of the present invention may have a protection factor of from 30 to 99.

In various embodiments, the cosmetic sunscreen composition of the present invention may have an SPF of 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 90 or 99.

In one embodiment, the cosmetic sunscreen composition of the present invention may have a protection factor of 50.

In one embodiment, the cosmetic sunscreen composition of the present invention may have a protection factor of 60.

In one embodiment, the cosmetic sunscreen composition of the present invention may have a protection factor of 70.

In one embodiment, the cosmetic sunscreen composition of the present invention may have a protection factor of 80.

In one embodiment, the cosmetic sunscreen composition of the present invention may have a protection factor of 90.

In one embodiment, the cosmetic sunscreen composition of the present invention may have a protection factor of 99.

The cosmetic sunscreen composition of the present invention can be used as a daily skin product.

The cosmetic sunscreen composition of the present invention is free of styrene/acrylate copolymers.

In another embodiment, the present invention relates to the use of the cosmetic sunscreen composition for the manufacture of a product for use as a daily sunscreen product.

Terms

By the term “at least” is meant one or more and this therefore includes individual components such as mixtures/combinations.

Except in working examples, or unless otherwise indicated, all numbers expressing quantities of ingredients and/or reaction conditions are understood to be modified in all circumstances by the term “approximately”, meaning to within +/- 5% of the number indicated.

In this document, all ranges provided are intended to include each specific range within the given ranges, as well as a combination of intermediate subranges. Thus, a range of 1 to 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 a range described herein may serve as a minimum or maximum value to derive a subrange, etc.

Emulsified carnauba wax

As used herein, “emulsified carnauba wax” means an emulsified and micronized carnauba wax, in a fine and homogeneous dispersion (micro-dispersion). In particular, the emulsified carnauba wax is an oil-in-water (O/W) emulsion comprising solid carnauba wax, water and at least one surfactant, marketed under the trademark Hostapur CW by Clariant.

In a preferred embodiment, the amount of solid carnauba wax in the emulsified carnauba wax is at least about 30.0% by weight, based on the total weight of the emulsified carnauba wax, preferably from about 30.0% by weight to about 50.0% by weight, based on the total weight of the emulsified carnauba wax.

Solid carnauba wax is a hard wax scraped from the leaves and leaf stems of the carnauba palm, Copernicia cerifera. Carnauba wax comprises esters of _C18 - _C32 fatty acids and _C28 - _C34 alcohols, also containing large amounts of hydroxy acid esters and melting points around 80-86 °C.

Further, the solid carnauba wax generally comprises from about 80% to about 85% by weight of fatty esters, from about 1% by weight to about 5% by weight of alcohols, from about 1% by weight to about 5% by weight of hydrocarbons, from about 1% by weight to about 5% by weight of free acids, from about 1% by weight to about 6% by weight of resins, from about 1% by weight to about 5% by weight of lactic components and from about 0.1% by weight to about 2% by weight of moisture.

In a preferred embodiment, the amount of water in the emulsified carnauba wax of the present invention is at least about 40% by weight, based on the total weight of the emulsified carnauba wax, preferably from about 40% to about 60% by weight, based on the total weight of the emulsified carnauba wax.

The at least one surfactant of the emulsified carnauba wax is selected from the group of anionic surfactants, nonionic surfactants and combinations thereof.

Non-limiting examples of anionic surfactants for the embodiment of the present invention are selected from the group consisting of alkyl sulfates, alkyl phosphates, alkyl ether sulfates, alkyl ether phosphates, alkylamido ether sulfates, alkylaryl polyether sulfates, monoglyceride sulfates, sulfonates, such as alkylsulfonates, alkylamide sulfonates, alkylarylsulfonates, alpha-olefin sulfonates, paraffin sulfonates, sulfosuccinates, alkylsulfosuccinates, alkyl ether sulfosuccinates, alkylamide sulfosuccinates, alkyl sulfoacetates, acylsarcosinates, acylglutamates, alkylsulfosuccinamates, taurates and N-acyl N-methyltaurates, isethionates, N-acylisethionates, N-acyltaurates, phosphates and alkyl phosphates, salts of alkyl monoesters and polyglycoside-polycarboxylic acids, acyl lactylates, salts of D-galactoside uronic acids, salts of alkyl ether carboxylic acids, salts of alkyl aryl ether carboxylic acids and salts of alkylamido ether carboxylic acids or the non-salified forms of all these compounds, the alkyl and acyl groups of all these compounds comprising from 6 to 24 carbon atoms and the aryl group denoting a phenyl group. Some of these compounds can be oxyethylenated, then preferably comprise from 1 to 50 ethylene oxide units.

Non-limiting examples of nonionic surfactants for the embodiment of the present invention include, for example, alkyl and polyalkyl esters of glycerol, such as polyglyceryl-3 dicitrate/stearate, mixtures of alkyl and polyalkyl esters of glycerol with polyglyceryl, such as polyglyceryl-3 methylglucose distearate, oxyalkylenated (more particularly polyoxyethylenated) fatty acid esters of glycerol; oxyalkylenated fatty acid esters of sorbitan; oxyalkylenated (oxyethylenated and/or oxypropylenated) fatty acid esters; oxyalkylenated (oxyethylenated and/or oxypropylenated) fatty alcohol ethers; sugars, for example sucrose stearate; fatty ethers of alcohols, in particular alkyl polyglucosides (APGs), such as decyl glucoside, lauryl glucoside, cetearyl glucoside, optionally as a mixture with cetearyl alcohol, and also an achyl glucoside, for example in the form of a mixture of arachidyl alcohol, behenyl alcohol and arachidyl alcohol. According to a particular embodiment of the invention, the mixture of the alkyl polyglucoside as defined above with the corresponding fatty alcohol may be in the form of a self-emulsifying composition. Mention may also be made of lecithins and derivatives (e.g. Biophilic), sugar esters and sodium stearoyl lactylate.

In a preferred embodiment, the surfactants used in the emulsified carnauba wax are isotridecyl phosphate and laureth-23.

The emulsified carnauba wax of the present invention may also include additional ingredients such as preservatives and solvents. A non-limiting example of a preservative that may be used in accordance with the invention includes phenoxyethanol. A non-limiting example of a solvent that may be used in accordance with the invention includes glycerin.

UV filter

The cosmetic sunscreen composition of the present invention comprises one or more organic UV filters. In a further embodiment, the cosmetic sunscreen composition may further comprise an inorganic UV filter. In particular, the inorganic UV filter is selected from: titanium dioxide and zinc oxide, in a proportion ranging from 0.5 to 3.0% by weight, relative to the total weight of the composition.

Suitable non-limiting UV filters of the present invention could be as follows:

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, the entire contents of the patents and patent applications being incorporated by reference in their entirety.

As examples of other suitable oil-soluble sunscreen ingredients, mention may be made of 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-benzylidene camphor, manufactured 4-methylbenzylidene camphor, polyacrylamidomethyl benzylidene camphor.

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, the following compounds: bis-ethylhexyloxyphenol methoxyphenyl triazine, 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, methyl 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 combinations 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, 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, the entire contents of which are hereby incorporated by reference; and cationic salts and quaternary derivatives of cinnamido amine such as those described in U.S. Patent 5,601,811, the entire contents of which are incorporated herein by reference, and combinations thereof.

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, aluminium, 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.

Preferably, the water-soluble organic sunscreen ingredient will be selected from terephthalylidene dicamphor sulfonic acid, methylene bis-benzotriazolyl tetramethylbutylphenol and combinations thereof.

The water-soluble organic sunscreen ingredient is preferably present in the composition according to the invention in an amount of about 0.1 to about 10% by weight, preferably in an amount of about 0.5 to about 8% by weight, and more preferably in an amount of about 1% to about 7% by weight, relative to the total weight of the composition.

Preferably, the one or more UV filters of the cosmetic sunscreen composition of the present invention are selected from drometrizole trisiloxane, ethylhexyl salicylate, ethylhexyl triazone, homosalate, bis-ethylhexyloxyphenol methoxyphenyl triazine, butyl methoxydibenzoylmethane, diethylaminohydroxybenzoyl hexyl benzoate, phenylbenzimidazole sulfonic acid, titanium dioxide, zinc oxide, terephthalidene dicamphor sulfonic acid, octocrylene, and combinations thereof.

In a more preferred embodiment, the UV filter(s) of the cosmetic sunscreen composition of the present invention selected from drometrizole trisiloxane, ethylhexyl salicylate, ethylhexyl triazone, homosalate, bis-ethylhexyloxyphenol methoxyphenyl triazine, butyl methoxydibenzoylmethane, diethylaminohydroxybenzoyl hexyl benzoate, and combinations thereof.

In another more preferred embodiment, the UV filter(s) of the cosmetic sunscreen composition of the present invention are selected from phenylbenzimidazole sulfonic acid, butyl methoxydibenzoylmethane, ethylhexyl salicylate, titanium dioxide, zinc oxide, ethylhexyl triazone, terephthalidene dicamphor sulfonic acid, octocrylene, homosalate, bis-ethylhexyloxyphenol methoxyphenyl triazine, and combinations thereof. In another preferred embodiment, the UV filter(s) of the cosmetic sunscreen composition of the present invention are a combination of phenylbenzimidazole sulfonic acid, butyl methoxydibenzoylmethane, ethylhexyl salicylate, titanium dioxide, ethylhexyl triazone, terephthalidene dicamphor sulfonic acid, octocrylene, homosalate and bis-ethylhexyloxyphenol methoxyphenyl triazine. In another further preferred embodiment, the UV filter(s) of the cosmetic sunscreen composition of the present invention are a combination of butyl methoxydibenzoylmethane, ethylhexyl salicylate, ethylhexyl triazone, homosalate and octocrylene.

In a preferred embodiment, the organic UV filter(s) of the cosmetic sunscreen composition of the present invention may be selected from isotridecyl phosphate, bis-ethylhexyloxyphenol methoxyphenyl triazine, butyl methoxydibenzoylmethane, drometrizole trisiloxane, ethylhexyl salicylate, ethylhexyl triazone, homosalate, methylene bis-benzotriazolyl tetramethylbutylphenol, octocrylene, phenylzimidazole sulfonic acid, polyglyceryl-10 laurate, terephthalylidene dicamphor sulfonic acid, trisodium ethylenediamine disuccinate and combinations thereof.

In a preferred embodiment, the one or more organic UV filters of the cosmetic sunscreen composition of the present invention are preferably present in the composition according to the invention in an amount of about 10 to about 40% by weight, preferably in an amount of about 15 to about 38% by weight, and preferably of about 20% to about 36% by weight, relative to the total weight of the composition.

Additional polymers

In addition to the one or more polymers of the cosmetic sunscreen composition of the present invention, selected from C _12-22 alkyl acrylate/hydroxyethyl acrylate copolymer, ammonium acryloyldimethyltaurate/VP copolymer, sodium polyacrylate, carbomer, aluminum starch octenylsuccinate, acrylates/C _10-30 alkyl acrylate crosslinked polymer, acrylates/dimethicone copolymer, and a combination thereof, the composition may further comprise one or more additional polymers.

Such additional polymers may be selected from rheology modifying polymers and anionic polymers which may be water soluble or water dispersible at pH 7 and room temperature (25°C). According to the present invention, suitable polymers of the present invention could be the following.

The rheology modifying polymers are pre-neutralized and preferably selected from taurate polymers. These polymers comprise an ionic monomer part, 2-acrylamido-2-methylpropanesulfonic acid (AMPS), as well as another less polar monomer part (vinylpyrrolidone or beheneth-25 methacrylate). These polymers are used as thickeners and stabilizers for oil-in-water emulsions and form extremely stable emulsions already at low concentrations. In particular, these polymers can be used in conjunction with almost all oil phases, including silicone oils, hydrocarbons/waxes and ester oils.

Examples of taurate polymers are acrylates/vinyl isodecanoate crosspolymer (3V's Stabylen 30), ammonium acryloyldimethyltaurate/beheneth-25 methacrylate crosspolymer (Clariant's Aristoflex HMB), acrylates/acetyl itaconate copolymer (National Starch's Structure 3001), polyacrylamide (SEPPIC's Sepigel 305), a nonionic thickener, (Rohm and Haas's Aculyn46), or combinations thereof.

Anionic polymers may be polymers with anionic groups distributed along the polymer backbone. The anionic groups, which may include carboxylate, sulfonate, sulfate, phosphate, nitrate, or other negatively charged or ionizable groups, may be arranged on side groups of the backbone or may be incorporated into the backbone itself.

The anionic polymers may comprise at least one hydrophilic unit of olefinic unsaturated carboxylic acid type and at least one hydrophobic unit exclusively of alkyl ester (C ₁₀ -C ₃₀ ) of unsaturated carboxylic acid type.

In certain exemplary and non-limiting embodiments, the copolymers are selected from copolymers resulting from the polymerization of:

(1) at least one monomer of formula (I):

in which R ₁ is selected from H or CH ₃ or C ₂ H ₅ , providing monomers of acrylic acid, methacrylic acid or ethacrylic acid, and

(2) at least one alkyl ester monomer (C ₁₀ -C ₃₀ ) of unsaturated carboxylic acid type corresponding to the monomer of formula (II):

Non-limiting examples of (C ₁₀ -C ₃₀ ) alkyl esters of unsaturated carboxylic acids are for example selected from lauryl acrylate, stearyl acrylate, decyl acrylate, isodecyl acrylate, dodecyl acrylate and corresponding methacrylates, such as lauryl methacrylate, stearyl methacrylate, decyl methacrylate, isodecyl methacrylate and dodecyl methacrylate, and combinations thereof.

In addition, crosslinked polymers may be selected according to other exemplary embodiments. For example, these polymers may be selected from polymers resulting from the polymerization of a monomer mixture comprising:

(1) acrylic acid,

(2) an ester of formula (II) described above, in which R2 is chosen from H or CH3, R3 denoting an alkyl radical comprising from 12 to 22 carbon atoms and

(3) a crosslinking agent which is a well-known copolymerizable polyethylene unsaturated monomer, such as diallyl phthalate, allyl (meth)acrylate, divinylbenzene, (poly)ethylene glycol dimethacrylate and methylenebisacrylamide. Useful anionic polymers include, for example: polyacrylic acid; polymethacrylic acid; carboxyvinyl polymer; acrylate copolymers such as acrylate/C 10-30 alkyl acrylate crosspolymer, acrylic acid/vinyl ester/acrylate ninyl isodecanoate crosspolymer, acrylates/Palmerth-25 acrylate copolymer, acrylate/steareth-20 itaconate copolymer and acrylate/ceth-20 itaconate copolymer; sulfonate polymers such as polysulfonic acid, sodium polystyrene sulfonate supplied by Akzo Nobel under the trade name FKEXAN II, copolymers of methacrylic acid and acrylamidomethylpropane sulfonic acid, and copolymers of acrylic acid and acrylamidomethylpropane sulfonic acid; carboxymethylcellulose; carboxy guar gum; copolymers of ethylene and maleic acid and silicone acrylate polymer.

1. l’hydroxyéthylcellulose, par exemple le produit NATROSOL 250 HHR PC ou NATROSOL 250 HHR CS commercialisé par la société Ashland ;

Some examples of nonionic polymers could be as follows:

1. hydroxyethylcellulose, for example the product NATROSOL 250 HHR PC or NATROSOL 250 HHR CS marketed by the Ashland company;

(i) celluloses modified by groups comprising at least one fatty chain; examples which may be cited include:

- hydroxyethylcelluloses modified by groups comprising at least one fatty chain, such as alkyl, arylalkyl or alkylaryl groups, or combinations thereof, and in which the alkyl groups are preferably C ₈ -C ₂₂ , for example the product NATROSOL Plus Grade 330 CS (C _{16 alkyls)} marketed by the company Ashland, or the product BERMOCOLL EHM 100 marketed by the company AkzoNobel; methyl hydroxyethylcellulose; methyl ethyl hydroxyethylcellulose, known under the name of STRUCTURE CEL 8000 M marketed by the company AkzoNobel or hydroxypropyl cellulose, known under the name of product KLUCEL MF PHARM HYDROXYPROPYLCELLULOSOSE marketed by the company Ashland;

- hydroxyethylcelluloses modified with alkylphenyl polyalkylene glycol alkyl ether groups, such as the product Amercell Polymer HM-1500 (polyethylene glycol nonylphenyl (15) ether) marketed by the company Amerchol or

(iii) hydroxypropyl guars such as hydroxypropyl guar marketed under the product name JAGUAR HP 105 by the company Rhodia and hydroxypropyl guars modified by groups comprising at least one fatty chain, such as the product Esaflor HM 22 (C ₂₂ alkyl chain) marketed by the company Lamberti, and the products RE210-18 (C ₁₄ alkyl chain) and RE205-1 (C ₂₀ alkyl chain) marketed by the company Rhodia.

Surfactants

The cosmetic sunscreen of the present invention may comprise one or more suitable surfactants.

Non-limiting examples of surfactants suitable for the present invention are as follows.

Anionic surfactants useful in the invention include, for example, carboxylates (sodium 2-(2-hydroxyalkyloxy)acetate), amino acid derivatives (N-acylglutamates, N-acylglycinates or acylsarcosinates), alkyl sulfates, alkyl ethers and their oxyethylenated derivatives, sulfonates, isethionates and N-acylisethionates, alkyl taurates and N-methyltaurates, alkyl sulfosuccinates, alkyl sulfoacetates, phosphates and alkyl phosphates, anionic alkyl polyglycoside derivatives (acyl-D-galacside uronate) and combinations thereof.

Non-limiting examples of nonionic surfactants useful in the invention include, for example, oxyalkylenated (more particularly polyoxyethylenated) fatty acid esters of glycerol; inulin lauryl carbamate; oxyalkylenated fatty acid esters of sorbitan; oxyalkylenated (oxyethylenated and/or oxypropylenated) fatty acid esters; polyglyceryl-6 distearate (and) jojoba esters (and) cetyl alcohol (and) polyglyceryl-3 beeswax; oxyalkylenated (oxyethylenated and/or oxypropylenated) fatty alcohol ethers; sugar esters, for example, sucrose stearate; oxygenated alcohol ethers of sugars, in particular alkyl polyglucoxides (APG) such as decylside and laurylside, cetearylside optionally in admixture with cetearyl alcohol, and also arachidyl glucoside, for example in the form of a mixture of arachidyl alcohol, behenyl alcohol and arachidyl glucoside. According to a particular embodiment of the invention, the mixture of the alkyl polyglucoside as defined above with the corresponding fatty alcohol may be in the form of a self-emulsifying composition. Mention may also be made of lecithins and derivatives (e.g.: Biophilic), sugar esters and sodium stearoyl lactylate.

Non-limiting examples of fatty acids selected from higher C ₁₂ - C ₂₂ fatty acids, such as myristic acid, oleic acid, linoleic acid, linolenic acid, lauric acid, palmitic acid and combinations thereof.

Non-limiting examples of cationic surfactants are those that may be positively charged. This surfactant may carry one or more positive permanent charges or may contain one or more functional groups that are cationizable in the composition according to the disclosure. The cationic surfactant(s) may also be selected from optionally polyoxyalkylenated primary, secondary or tertiary fatty amines, or salts thereof, and quaternary ammonium salts, and combinations thereof. The fatty amines generally comprise at least one C ₈ -C ₃₀ hydrocarbon chain.

Preferred surfactants may be selected from isotridecyl phosphate, laureth-23, glyceryl stearate, glyceryl oleate, poloxamer 338, potassium cetyl phosphate, sodium methyl stearoyl taurate, stearic acid, PEG-8 laurate, sodium dodecylbenzenesulfonate, and combinations thereof.

Additional Ingredients

In addition to the essential components described above, the composition of the invention may further comprise any usual cosmetically acceptable ingredient, which may be chosen in particular from agents such as perfumes/fragrances, preservatives, additional solvents, active ingredients, additional fatty compounds, vitamins, fillers, silicones, pigments and combinations thereof.

The 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.

Non-limiting examples of preservative that may be used in accordance with the invention include phenoxyethanol, silica and silica silylate.

Suitable fillers of the invention could be such as the examples of oil absorbing fillers: mica, silica, zea may (corn) starch, magnesium oxide, nylon-12, nylon-66, cellulose, polyethylene, talc, talc (and) methicone, talc (and) dimethicone, perlite, sodium silicate, pumice, PTFE, polymethyl methacrylate, oryza sativa (rice) starch, modified potato starch, alumina, silica silylate, calcium sodium borosilicate, magnesium carbonate, hydrated silica, dimethicone/vinyl dimethicone crosslinked polymer, sodium carboxymethyl starch.

The cosmetic sunscreen composition of the present invention may further comprise water as a solvent, present in a concentration of about 30.0% to about 70.0% by weight, or about 35.0% to about 75.0% by weight, and preferably about 40.0% to about 70.0% by weight, including intermediate ranges and sub-ranges, based on the total weight of the combinations and/or compositions of the present disclosure.

Suitable additional active ingredients include, but are not limited to, disodium EDTA, p -anisic acid, triethanolamine and combinations thereof.

Examples of fats or oils include, but are not limited to, esters, fatty acids, synthetic oils and hydrocarbons/paraffins, such as stearyl alcohol, myristic acid, palmitic acid, diisopropyl sebacate, isononyl isononanoate, dicaprylyl ether, silicone mineral oils, vegetable/plant oils and combinations thereof.

A non-limiting example of vitamins suitable for the composition of the present invention includes tocopherol.

Examples of silicones used in the composition of the present invention, but not limited to, are dimethicone, caprylyl methicone and cyclohexasiloxane.

The additional ingredients may represent from about 60.0% to about 85.0% by weight, especially from about 60.0% to about 82.0% by weight, or from about 65.0% to about 80.0% by weight, relative to the total weight of the composition of the invention.

METHODS OF IMPLEMENTATION

Non-limiting embodiments of the cosmetic sunscreen composition of the present invention may be as follows.

In a first embodiment, the cosmetic sunscreen composition may comprise:

(a) from about 1.0 to about 5.0% by weight, based on the total weight of the composition, of emulsified carnauba wax;

(b) from about 20.0% to about 28.5% by weight, based on the total weight of the composition, of bis-ethylhexyloxyphenol methoxyphenyl triazine, butyl methoxydibenzoylmethane, drometrizole trisiloxane, ethylhexyl salicylate, ethylhexyl triazone, homosalate, trisodium ethylenediamine dissuccinate and combinations thereof;

(c) from about 0.1% to about 0.7% by weight, based on the total weight of the composition, of isotridecyl phosphate, laureth-23, PEG-8 laurate and combinations thereof;

(d) from about 1.5% to about 3.0% by weight, based on the total weight of the composition, of crosslinked acrylates/C _10-30 alkyl acrylate copolymer, C _12-22 alkyl acrylate/hydroxyethyl acrylate copolymer, sodium polyacrylate, and combinations thereof.

In another embodiment, the cosmetic sunscreen composition may comprise:

(a) from about 1.0 to about 5.0% by weight, based on the total weight of the composition, of emulsified carnauba wax;

(b) from about 20.0% to about 35.0% by weight, based on the total weight of the composition, of bis-ethylhexyloxyphenol methoxyphenyl triazine, butyl methoxydibenzoylmethane, drometrizole trisiloxane, ethylhexyl salicylate, ethylhexyl triazone, homosalate, isotridecyl phosphate and combinations thereof;

(c) from about 0.1% to about 1.0% by weight, based on the total weight of the composition, of glyceryl oleate, laureth-23, PEG8 laurate, sodium dodecylbenzenesulfonate and a combination thereof;

(d) from about 10.0% to about 20.0% by weight, based on the total weight of the composition, of acrylates/dimethicone copolymer, carbomer, styrene/acrylates copolymer and combinations thereof.

In another embodiment, the cosmetic sunscreen composition may comprise:

(a) from about 1.0 to about 5.0% by weight, based on the total weight of the composition, of emulsified carnauba wax;

(b) from about 12.0% to about 22.0% by weight, based on the total weight of the composition, of butyl methoxydibenzoylmethane, ethylhexyl triazone, homosalate, methylene bis-benzotriazolyl tetramethylbutylphenol, octocrylene, phenylbenzimidazole sulfonic acid, polyglyceryl-10 laurate, terephthalylidene dicamphor sulfonic acid, and combinations thereof;

(c) from about 2.0% to about 4.0% by weight, based on the total weight of the composition, of glyceryl stearate, isotridecyl phosphate, laureth-23, poloxamer 338, potassium cetyl phosphate, sodium methyl stearoyl taurate, stearic acid and combinations thereof;

(d) from about 2.0% to about 4.0% by weight, based on the total weight of the composition, of acrylates/C _10-30 alkyl acrylate crosslinked polymer, aluminum starch octenylsuccinate, ammonium acryloyldimethyltaurate/vp copolymer, and combinations thereof; and

(e) from about 1.0 to about 2.5% by weight, relative to the total weight of the composition, of one or more inorganic UV filters, chosen from: titanium dioxide.

PROCESS FOR MANUFACTURING SUNSCREEN COMPOSITION

An illustrative and non-limiting method of manufacturing the cosmetic sunscreen composition according to the present invention may comprise the following steps:

a) heating the oily phase containing fatty compounds, emollients and oily UV filters up to 75°C;

a1) when present in the cosmetic composition, addition and heating of the polymers in a);

b) heating the aqueous phase containing up to 70°C;

b1) when present in the composition, addition and heating of the polymers in step b);

c) adding step (b) to step (a) homogenizing the mixture;

d) addition of fillers, antioxidants, perfume and other possible solvents below 45°C homogenizing the mixture.

EXAMPLES

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

Examples 1 to 4

A suitable composition according to the state of the art is in the form of Examples 1 and 2 and suitable compositions according to the present invention are in the form of Examples 3 to 4, as follows:

Function Ingredient Ex. 1 Ex. 2 Ex. 3 Ex. 4 Active compound Disodium EDTA 0.01-1 0.01-1 0.01-1 0.01-1 Active compound Triethanolamine 0.01-2.5 0.01-2.5 0.01-2.5 0.01-2.5 Fat compound Myristic acid 0.01-5 0.01-5 0.01-5 0.01-5 Fat compound Palmitic acid 0.01-5 0.01-5 0.01-5 0.01-5 Fat compound Diisopropyl sebacate 0.05-40 0.05-40 0.05-40 0.05-40 Fat compound Isononyl isononanoate 0.05-40 0.05-40 0.05-40 0.05-40 Fatty compound Stearyl alcohol 0.01-10 0.01-10 0.01-10 0.01-10 Charge Silica 0.1-10 0.1-10 0.1-10 0.1-10 Charge Silica silylate 0.01-5 0.01-5 0.01-5 0.01-5 Pigment Aluminum hydroxide 0.01-2 0.01-2 0.01-2 0.01-2 Polymer Crosslinked polymer of acrylates/C _10-30 alkyl acrylate 0.01-10 0.01-10 0.01-10 0.01-10 Polymer Aluminum octenylsuccinate starch 0.1-10 0.1-10 0.1-10 0.1-10 Polymer Ammonium acryloyldimethyl taurate/BP copolymer 0.01- 5 0.01- 5 0.01- 5 0.01- 5 Conservative BHT 0.0001 - 1 0.0001 - 1 0.0001 - 1 0.0001 - 1 Conservative Phenoxyethanol 0.01-1 0.01-1 0.01-1 0.01-1 Silicone Caprylyl methicone 0.5-10 0.5-10 0.5-10 0.5-10 Solvent Butylene glycol 1-20 1-20 1-20 1-20 Solvent t-Butyl alcohol 0.01-0.1 0.01-0.1 0.01-0.1 0.01-0.1 Solvent Caprylyl glycol 0.01-2 0.01-2 0.01-2 0.01-2 Solvent Glycerin 1-30 1-30 1-30 1-30 Solvent PEG-100 Stearate 0.1-5 0.1-5 0.1-5 0.1-5 Solvent Pentylene glycol 1-20 1-20 1-20 1-20 Solvent Water Q.S. Q.S. Q.S. Q.S. IP enhancer Copernicia cerifera (carnauba) wax - - 2 2 Surfactant Isotridecyl phosphate - - 0.1-1 0.1-1 Surfactant Laureth-23 - - 0.01-2 0.01-2 Surfactant Glyceryl stearate 0.1-10 0.1-10 0.1-10 0.1-10 Surfactant Poloxamer 338 0.05-5 0.05-5 0.05-5 0.05-5 Surfactant Potassium cetyl phosphate 0.1-5 0.1-5 0.1-5 0.1-5 Surfactant Sodium methyl stearoyl taurate 0.1-5 0.1-5 0.1-5 0.1-5 Surfactant Stearic acid 0.1-10 0.1-10 0.1-10 0.1-10 UV filter Polyglyceryl-10 laurate 0.001-3 0.001-3 0.001-3 0.001-3 UV filter Bis-ethylhexyloxyphenol methoxyphenyl triazine 0.1-10 0.1-10 0.1-10 0.1-10 UV filter Butyl methoxydibenzoylmethane 0.1-5 0.1-5 0.1-5 0.1-5 UV filter Ethylhexyl triazone 0.1-5 0.1-5 0.1-5 0.1-5 UV filter Homosalate 0.1-15 0.1-15 0.1-15 0.1-15 UV filter Methylene bis-benzotriazolyl tetramethylbutylphenol 0.1-10 0.1-10 0.1-10 0.1-10 UV filter Octocrylene 0.1-10 0.1-10 0.1-10 0.1-10 UV filter Phenylbenzimidazole sulfonic acid 0.1-8 0.1-8 0.1-8 0.1-8 UV filter Terephthalylidene dicamphor sulfonic acid 0.1-10 0.1-10 0.1-10 0.1-10 UV filter Titanium dioxide 0.5-25 0.5-25 0.5-25 0.5-25 Vitamin Tocopherol 0.05-2 0.05-2 0.05-2 0.05-2

State of the art compositions and the present invention

Examples 5 to 8

Suitable compositions according to the state of the art are in the form of Example 5, and suitable compositions according to the present invention are in the form of Examples 6 to 8, as follows:

Function Ingredients Ex. 5 Ex. 6 Ex. 7 Ex. 8 Fat compound Dicaprylyl ether 0.5-40 0.5-40 0.5-40 0.5-40 Fat compound Diisopropyl adipate 0.5-20 0.5-20 0.5-20 0.5-20 Fatty compound Diisopropyl sebacate 0.5-40 0.5-40 0.5-40 0.5-40 Polymer Crosslinked polymer of acrylates/C _10-30 alkyl acrylate 0.01-10 0.01-10 0.01-10 0.01-10 Polymer C _12-22 alkyl acrylate/hydroxyethyl acrylate copolymer 0.01-10 0.01-10 0.01-10 0.01-10 Polymer Sodium polyacrylate 0.01-5 0.01-5 0.01-5 0.01-5 Polymer Styrene/acrylates copolymer - 0.1-10 - - Conservative Phenoxyethanol - - 0.01-1 0.01-1 Solvent Alcohol 0.5-20 0.5-20 0.5-20 0.5-20 Solvent Caprylyl glycol 0.01-2 0.01-2 0.01-2 0.01-2 Solvent Glycerin 1-30 1-30 1-30 1-30 Solvent Propanediol 0.1-20 0.1-20 0.1-20 0.1-20 Solvent Water Q.S. Q.S. Q.S. Q.S. IP enhancer Copernicia cerifera (carnauba) wax - - 0.5-15 0.5-15 Surfactant Isotridecyl phosphate - - 0.1-1 0.1-1 Surfactant Laureth-23 - - 0.01-2 0.01-2 Surfactant PEG-8 laurate - 0.5-5 - - Surfactant Sodium dodecylbenzenesulfonate - 0.01-1 - - UV filter Bis-ethylhexyloxyphenol methoxyphenyl triazine 0.1-10 0.1-10 0.1-10 0.1-10 UV filter Butyl methoxydibenzoylmethane 0.1-5 0.1-5 0.1-5 0.1-5 UV filter Drometrizole trisiloxane 0.1-15 0.1-15 0.1-15 0.1-15 UV filter Ethylhexyl salicylate 0.1-5 0.1-5 0.1-5 0.1-5 UV filter Ethylhexyl triazone 0.1-5 0.1-5 0.1-5 0.1-5 UV filter Homosalate 0.1-15 0.1-15 0.1-15 0.1-15 UV filter Trisodium ethylenediamine disuccinate 0.1-2 0.1-2 0.1-2 0.1-2 Vitamin Tocopherol 0.0001-2 0.0001-2 0.0001-2 0.0001-2 Vitamin Tocopherol 0.0001-2 0.0001-2 0.0001-2 0.0001-2

State of the art compositions and the present invention

Examples 9 to 12

Suitable compositions according to the state of the art are in the form of Example 9 and suitable compositions according to the present invention are in the form of Examples 10 to 12, as follows:

Function Ingredients Ex. 9 Ex. 10 Ex. 11 Ex. 12 Active compound Disodium EDTA 0.01-1 0.01-1 0.01-1 0.01-1 Active compound p-Anisic acid 0.01-1 0.01-1 0.01-1 0.01-1 Active compound Triethanolamine 0.01-2.5 0.01-2.5 0.01-2.5 0.01-2.5 Emollient Hydrogenated palm glycerides citrate 0.0001-0.002 0.0001-0.002 0.0001-0.002 0.0001-0.002 Emollient Lecithin 0.00001-0.002 0.00001-0.002 0.00001-0.002 0.00001-0.002 Fatty compound Dicaprylyl ether 0.5-40 0.5-40 0.5-40 0.5-40 Polymer Acrylates/dimethicone copolymer 0.1-10 0.1-10 0.1-10 0.1-10 Polymer Carbomer 0.1-5 0.1-5 0.1-5 0.1-5 Polymer Styrene/acrylates copolymer 0.1-15 Conservative Phenoxyethanol 0.01-1 0.01-1 0.01-1 0.01-1 Silicone Dimethicone 0.1-20 0.1-20 0.1-20 0.1-20 Solvent Alcohol 0.5-20 0.5-20 0.5-20 0.5-20 Solvent Glycerin 1-30 1-30 1-30 1-30 Solvent Isohexadecane 1-30 1-30 1-30 1-30 Solvent Propanediol 0.1-20 0.1-20 0.1-20 0.1-20 Solvent Water Q.S. Q.S. Q.S. Q.S. IP enhancer Copernicia cerifera (carnauba) wax - - 0.5-15 0.5-15 Surfactant Laureth-23 - - 0.01-2 0.01-2 Surfactant PEG-8 laurate - 0.5-5 - - Surfactant Sodium dodecylbenzenesulfonate - 0.01-1 - - Surfactant Glyceryl Oleate 0.01-2 0.01-2 0.01-2 0.01-2 UV filter Drometrizole trisiloxane 0.1-15 0.1-15 0.1-15 0.1-15 UV filter Isotridecyl phosphate - - 0.1-1 0.1-1 UV filter Bis-ethylhexyloxyphenol methoxyphenyl triazine 0.1-10 0.1-10 0.1-10 0.1-10 UV filter Butyl methoxydibenzoylmethane 0.1-5 0.1-5 0.1-5 0.1-5 UV filter Ethylhexyl salicylate 0.1-5 0.1-5 0.1-5 0.1-5 UV filter Ethylhexyl triazone 0.1-5 0.1-5 0.1-5 0.1-5 UV filter Homosalate 0.1-15 0.1-15 0.1-15 0.1-15 Vitamin Ascorbyl palmitate 0.00001-1 0.00001-1 0.00001-1 0.00001-1 Vitamin Tocopherol 0.0001 - 2 0.0001 - 2 0.0001 - 2 0.0001 - 2 Vitamin Tocopherol 0.0001 - 2 0.0001 - 2 0.0001 - 2 0.0001 - 2

State of the art compositions and the present invention

TESTS Test 1 – In Vivo

State-of-the-art compositions of low (Ex. 1) and high (Ex. 2) IP were compared with inventive compositions according to Ex. 3 (low IP) to 4 (high IP).

In both cases, carnauba wax was incorporated and a reinforcing effect was observed. The low IP composition of the state of the art according to Ex. 1 demonstrated an IP of 53.8 while the low IP inventive composition of the present invention according to Ex. 3 demonstrated an IP of 80.3. The high IP composition of the state of the art according to Ex. 2 demonstrated an IP of 63.2 while the high IP inventive composition of the present invention according to Ex. 4 demonstrated an IP of 81.5.

For a low IP (inventive composition of Ex. 3) the reinforcing effect seems to be greater than that of a high IP (inventive composition of Ex. 4), however the effect is perceived in both compositions.

Test 2 – In Vivo

The state-of-the-art compositions according to Ex. 5 (without reinforcers) and Ex. 6 (with styrene/acrylates copolymer) were compared with the inventive compositions of Ex. 7 to 8.

The reference formula (Ex. 5) was used to incorporate carnauba wax at two different concentrations (Ex. 7 and 8) and the state-of-the-art styrene/acrylate copolymer enhancers (Ex. 6). The composition of Ex. 5 demonstrated an in vivo PI of 48.3 and the composition of Ex. 6 demonstrated a PI of 56.9, while the inventive composition of Ex. 7 and 8 exhibited a PI of 54.9 and 52.6, respectively.

We can conclude that carnauba wax was able to increase the IP at both concentrations used and achieve a similar performance to the styrene/acrylates copolymer. Comparing the cost of each enhancer, we can conclude that the cost per enhancement performance of carnauba wax is lower, which has a lesser impact on the product cost.

Test 3 – In Vivo

The state-of-the-art compositions according to Ex. 9 (without reinforcers) and Ex. 10 (with styrene/acrylates copolymer) were compared with the inventive compositions of Ex. 11 to 12.

The reference formula (Ex. 9) was used to incorporate carnauba wax at two different concentrations (Ex. 11 and 12) and the state-of-the-art styrene/acrylate copolymer enhancers (Ex. 10). The composition of Ex. 9 demonstrated an in vivo PI of 29.9 and the composition of Ex. 10 demonstrated a PI of 44.9, while the inventive composition of Ex. 11 and 12 exhibited a PI of 43.3 and 40.0, respectively.

We can conclude that carnauba wax was able to increase the IP at both concentrations used and achieve a similar performance to the styrene/acrylates copolymer. Comparing the cost of each enhancer, we can conclude that the cost per enhancement performance of carnauba wax is lower, which has a lesser impact on the product cost.

Claims (9)

Cosmetic sunscreen composition comprising:
(a) emulsified carnauba wax;
(b) one or more organic UV filters;
(c) one or more surfactants selected from stearic acid, glyceryl stearate, PEG-100 stearate, potassium cetyl phosphate, poloxamer 338, glyceryl oleate, sodium methyl stearoyl taurate, glyceryl oleate, combinations thereof; and
(d) one or more polymers selected from C _12-22 alkyl acrylate/hydroxyethyl acrylate copolymer, ammonium acryloyldimethyltaurate/VP copolymer, sodium polyacrylate, carbomer, aluminum starch octenylsuccinate, acrylates/C _10-30 alkyl acrylate crosslinked polymer, acrylates/dimethicone copolymer and combinations thereof. A cosmetic sunscreen composition according to claim 1, wherein the emulsified carnauba wax ranges from 0.5 to 15.0% by weight, based on the total weight of the composition. Cosmetic sunscreen composition according to claim 1, wherein the one or more organic UV filters are selected from: isotridecyl phosphate, bis-ethylhexyloxyphenol methoxyphenyl triazine, butyl methoxydibenzoylmethane, drometrizole trisiloxane, ethylhexyl salicylate, ethylhexyl triazone, homosalate, methylene bis-benzotriazolyl tetramethylbutylphenol, octocrylene, phenylbenzozimidazole sulfonic acid, polyglyceryl-10 laurate, terephthalylidene dicamphor sulfonic acid, trisodium ethylenediamine disuccinate and combinations thereof. Cosmetic sunscreen composition according to claim 1, wherein the composition further comprises an inorganic UV filter, selected from: titanium dioxide and zinc oxide; ranging from 0.5 to 3.0% by weight, relative to the total weight of the composition. Cosmetic sunscreen composition according to claim 1, wherein the one or more UV filters range from 10.0 to 40.0% by weight, relative to the total weight of the composition. A cosmetic sunscreen composition according to claim 1, wherein the one or more surfactants range from 0.01 to 10.0% by weight, relative to the total weight of the composition. A cosmetic sunscreen composition according to claim 1, wherein the one or more polymers range from 0.01 to 10.0% by weight, relative to the total weight of the composition. A cosmetic sunscreen composition according to claim 1, further comprising cosmetically acceptable ingredients selected from perfumes/fragrances, preservatives, additional solvents, active compounds, vitamins, fillers, silicones, pigments and combinations thereof. A cosmetic sunscreen composition according to claim 1, wherein it is an oil-in-water composition.