A personal care composition

Abstract

The present invention relates to a personal care composition. Particularly, the present invention relates to a personal care composition, that provides protection from blue light induced damages. Additionally, the composition provides benefits e.g. instant glow, protection from UV and moisturization. The composition comprises certain pigments in combination with select UVA sunscreens, UVB sunscreens, emollients and humectants.

Description

[0001] A PERSONAL CARE COMPOSITION

[0002] Field of the invention

[0003] The present invention relates to a personal care composition. Particularly, the present invention relates to a personal care composition that provides protection to skin from blue light induced damages.

[0004] Background of the invention

[0005] People tend to get exposed to ultraviolet light (UV; 200 to 400 nm) as well as to visible light (400 to 700 nm). Scientific studies have indicated that exposure to UV-A (320 to 400 nm) and UV-B (280 to 320 nm) for short period causes pigmentation, reddening of the skin and localized irritation, whereas continued or prolonged exposure can lead to sunburn, formation of wrinkles and age spots. UV radiation is also thought to cause significant damage to hair. Therefore, it is desirable to protect the skin and other keratinous substrates of the human body from the harmful effects of both UV-A and UV-B radiation. Additionally, visible light, particularly blue light (about 400 to 495 nm) is also reported to induce undesired effects.

[0006] Whilst several personal care compositions are available in the market that intend to provide protection from exposure to UV, there is still need to a provide personal care composition that provides protection from blue light induced undesired effects or damages. Additionally, people tend to prefer personal care compositions that provide multiple benefits through one composition. Such additional benefits may be for example, moisturizing effect and instant glow (highlighting effect). Therefore, there is also a need to provide a personal care composition that provides protection from blue light induced damages; and at the same time, provide an additional benefit e.g. moisturizing effect and an instant glow.

[0007] It has now been found that when certain pigments were combined with select UV-A sunscreens and UV-B sunscreens, humectants and emollients, it provided protection from blue light induced damages. Moreover, it has been found that the composition additionally provided additional benefits e.g. instant glow, moisturization and protection from UV.

[0008] Summary of the invention

[0009] In a first aspect, the present invention relates to a personal care composition comprising: a. 0.1 to 10 wt% one or more humectants, b. 0.1 to 10 wt% one or more emollients, c. 1 to 10 wt% one or more IIV-A sunscreens, d. 5 to 20 wt% one or more IIV-B sunscreens; and e. 3 to 10 wt% one or more pigments, wherein the one or more pigments are selected from (i) mixtures of mica with titanium dioxide and silica (ii) mixtures of mica with titanium dioxide and tin oxide; and wherein the composition is in the form of oil-in-water emulsion.

[0010] In a second aspect, the present invention relates to a method of providing, protection from blue light induced damages to the skin comprising the steps of (i) applying the composition of the first aspect on to the skin.

[0011] In a third aspect, the present invention relates to use of the composition of the first aspect for providing protection to skin from blue light induced damages.

[0012] Detailed description of the invention

[0013] Any feature of one aspect of the present invention may be utilized in any other aspect of the invention. The word “comprising” is intended to mean “including” but not necessarily “consisting of” or “composed of.” In other words, the listed steps or options need not be exhaustive. Except in the operating and comparative examples, or where otherwise explicitly indicated, all numbers in this description indicating amounts of material or conditions of reaction, physical properties of materials and / or use are to be understood as modified by the word “about”. Numerical ranges expressed in the format " x to y" are understood to include x and y. When for a specific feature multiple preferred ranges are described in the format "x to y", it is understood that all ranges combining the different endpoints are also contemplated. Unless specified otherwise, amounts as used herein are expressed in percentage by weight based on total weight of the composition and may be abbreviated as “wt%”. The use of any and all examples or exemplary language e.g. “such as” provided herein is intended merely to better illuminate the invention and does not in any way limit the scope of the invention otherwise claimed. Except in the examples, or where otherwise explicitly indicated, all numbers in this description indicating amounts of material or conditions of reaction, physical properties of materials and / or use may optionally be understood as modified by the word “about”.

[0014] The composition of the invention is meant to be used for personal care or for cosmetic use and could also be referred to as a cosmetic composition. By “personal care composition” as used herein, is meant to include a composition for topical application to sun-exposed areas of the skin and / or hair of humans. Such a composition may be classified as leave-on and includes any product applied to a human body for improving appearance, odor control or general aesthetics. The composition of the present invention can be in the form of a liquid, a lotion, a cream, a foam, a stick or a gel. Non-limiting examples of such compositions include leave-on skin lotions, creams, antiperspirants, deodorants, foundations, mascara, sunscreen lotions. The composition of the present invention is preferably a leave-on composition.

[0015] ‘Skin’ as used herein, preferably means to include skin on any part of the body e.g. face, neck, chest, back, arms, hands, legs, and and especially to the sun exposed parts thereof.

[0016] Preferably, the phrase ‘UV induced damages’ or 'protection from UV’ preferably means protection from damages or harmful or potentially harmful effects that may be caused by exposure to UV. Protection from ultraviolet (UV) light includes protection from UV-A (preferably measured in terms of UVA protection factor (UVAPF)) and / or protection from UV-B (preferably measured in terms of sun protection factor (SPF)).

[0017] Likewise, the phrase ‘visible light induced damages’ or 'protection from visible light’ preferably means protection from damages or harmful or potentially harmful effects that may be caused by exposure to visible light. Likewise, the phrase ‘blue light induced damages’ or 'protection from blue light’ preferably means protection from damages or harmful or potentially harmful effects that may be caused by exposure to blue light.

[0018] The terms ‘highlighting effect’, ‘instant glow’ may be used interchangeably, and they denote the same meaning. Preferably, the instant glow is measured as the difference in L* values before and after the application of the composition. The difference may be called as color change and may be denoted as ‘AL’ (delta L). The delta L may be calculated based on the color measurement presented by Hunter lab color space L*, a* and b* where, L* is black-white space, a* is green-red space, b* is blue-yellow space. For example, larger the L* value means more white, and smaller b* value means more blue. By the term ‘instant’ as used in instant glow, it is preferably meant that the glow so obtained is obtained within 15 minutes, preferably within 10 minutes, preferably within 5 minutes, preferably within 3 minutes, preferably within 2 minutes e.g. 1 minute, after the composition is applied on the skin. Accordingly, the term instant glow preferably means the glow obtained within such time intervals. Accordingly, in a first aspect, the present invention relates to a personal care composition comprising: a. 0.1 to 10 wt% one or more humectants, b. 0.1 to 10 wt% one or more emollients, c. 1 to 10 wt% one or more IIV-A sunscreens, d. 5 to 20 wt% one or more IIV-B sunscreens; and e. 3 to 10 wt% one or more pigments, wherein the one or more pigments are selected from (i) mixtures of mica with titanium dioxide and silica (ii) mixtures of mica with titanium dioxide and tin oxide; and wherein the composition is in the form of oil-in-water emulsion.

[0019] Humectants

[0020] Preferably, the composition further comprises one or more humectants. Humectants of the polyhydric alcohol-type can be employed as cosmetically acceptable carriers. Preferably the humectant is at least one of propylene glycol, dipropylene glycol, polypropylene glycol, polyethylene glycol, sorbitol, hydroxypropyl sorbitol, hexylene glycol, 1 ,3-butylene glycol, isoprene glycol, glycerol, ethoxylated glycerol, and propoxylated glycerol. Preferred humectants are selected from one or more of glycerol, sorbitol, propylene glycol and 1 ,3-butylene glycol. Glycerol and / or is the most preferred humectant. It is preferred that the amount of humectant is in the range from 1 to 10 wt%, more preferably from 2 to 8 wt% and further more preferably from 2 to 5 wt%.

[0021] Emollients

[0022] The composition further comprises one or more emollients that may serve as cosmetically acceptable carriers. Preferably, the one or more emollients are selected from alkane diols, silicone oils, natural or synthetic esters, and hydrocarbons. More preferably the one or more emollient is of alkane diol type.

[0023] Examples of alkane diols include 1 ,2-octane diol (caprylyl glycol), 2,3-octane diol, 1 ,2-nonane diol, 1 ,2-decane diol, 1 ,2-hexane diol, 3,4-octane diol, mixtures thereof. More preferred alkane diol is caprylyl glycol.

[0024] Silicone oils may be divided into the volatile and nonvolatile variety. The term "volatile" as used herein refers to those materials which have a measurable vapor pressure at ambient temperature. Volatile silicone oils are preferably chosen from cyclic (cyclomethicone) or linear polydimethylsiloxanes containing from 3 to 9, preferably from 5 to 6, silicon atoms. Nonvolatile silicone oils useful as an emollient material include polyalkyl siloxanes, polyalkylaryl siloxanes and polyether siloxane copolymers. The essentially nonvolatile polyalkyl siloxanes useful herein include, for example, polydimethyl siloxanes with viscosities of from 5 x 106to 0.1 m2 / s at 25 °C. Among the preferred nonvolatile emollients useful in the present compositions are the polydimethyl siloxanes having viscosities from 1 x 105to 4 x 104m2 / s at 25 °C.

[0025] Another class is of ester emollients, which are alkyl esters of saturated fatty acids having 10 to 24 carbon atoms. Examples thereof include behenyl neopentanoate, isononyl isonanonoate, isopropyl myristate and octyl stearate. Alternatively, they are ether-esters such as fatty acid esters of ethoxylated saturated fatty alcohols. Further alternatively they are polyhydric alcohol esters such as ethylene glycol mono and di-fatty acid esters, diethylene glycol mono- and di-fatty acid esters, polyethylene glycol (200-6000) mono- and di- fatty acid esters, propylene glycol mono- and di-fatty acid esters, polypropylene glycol 2000 monostearate, ethoxylated propylene glycol monostearate, glyceryl mono- and di-fatty acid esters, polyglycerol poly-fatty esters, ethoxylated glyceryl mono-stearate, 1 ,3-butylene glycol monostearate, 1 ,3-butylene glycol distearate, polyoxyethylene polyol fatty acid ester, sorbitan fatty acid esters, and polyoxyethylene sorbitan fatty acid esters are satisfactory polyhydric alcohol esters. Particularly useful are pentaerythritol, trimethylolpropane and neopentyl glycol esters of C1-C30 alcohols. Further, natural ester emollients are those based on mono-, di- and tri- glycerides. Representative glycerides include sunflower seed oil, cottonseed oil, borage oil, borage seed oil, primrose oil, castor and hydrogenated castor oils, rice bran oil, soybean oil, olive oil, safflower oil, shea butter, jojoba oil and combinations thereof.

[0026] Hydrocarbons, which are suitable cosmetically acceptable carriers include petrolatum, mineral oil, C8-Ci8 isoparaffins, polybutenes and especially isohexadecane, available commercially as Permethyl® 101 A from Presperse Inc.

[0027] The composition comprises from 0.1 to 10 wt%, preferably 1 to 9 wt%, more preferably 2 to 8 wt% even more preferably 3 to 7 wt%, further more preferably 4 to 6 wt% e.g. 5 wt% one or more emollients.

[0028] UV-A sunscreens

[0029] The composition comprises one or more UV-A sunscreens. These sunscreens absorb the UV-A light and protects the skin. Preferably, the one or more IIV-A sunscreen may be selected from one or more of a dibenzoylmethane compound, diethylamino hydroxy benzoyl hexyl benzoate and methyl anthranilate. Suitable dibenzoylmethane compounds are selected from one of more of t- butylmethoxy dibenzoylmethane, 2-methyldibenzoylmethane, 4-methyl-dibenzoyl-ethane, 4- isopropyldibenzoyl-methane, 4-tert-butyldibenzoylmethane, 2,4-dimethyldibenzoylmethane, 2,5- dimethyldibenzoylmethane, 4,4'-diisopropyl-dibenzoylmethane, 2-methyl-5-isopropyl-4'- methoxydibenzoylmethane, 2-methyl-5-tert-butyl-4'-methoxy-dibenzoyl methane, 2,4-dimethyl- 4'-methoxy dibenzoylmethane and 2,6-dimethyl-4-tert-butyl-4'-methoxy-dibenzoylmethane. The most preferred dibenzoyl methane compound is t-butylmethoxy dibenzoylmethane, commercially available as Parsol®1789.

[0030] Alternately, there are certain sunscreens which have both, IIV-A and IIV-B screening efficacy. It is selected from one or more bis-ethylhexyloxyphenol methoxyphenyl triazine, drometrizole trisiloxane, benzophenone and its derivatives. The most preferred one is bis-ethylhexyloxyphenol methoxyphenyl triazine, commercially available as Tinosorb S.

[0031] The composition comprises 1 to 10 wt%, preferably 2 to 9 wt%, more preferably 3 to 8 wt%, even more preferably 4 to 7 wt% e.g. 5 wt% one or more IIV-A sunscreens.

[0032] IIV-B sunscreen

[0033] The composition comprises one or more IIV-B sunscreen. These sunscreens absorb the IIV-B light (280 to 320 nm) and protect the skin from.

[0034] Preferably, the one or more IIV-B sunscreen may be selected from selected from octyl salicylate, 3,3,5-trimethylclohexyl 2-hydroxybenzoate, ethylhexyl salicylate, 2-ethylhexyl 2-cyano-3,3- diphenyl-2-propenoate which is also known as octocrylene, 2-ethylhexyl-4-methoxycinnamate or octylmethoxycinnamate, ethylhexyl triazone, 3-benzylidene camphor, cinoxate, diethylhexyl butamido triazone, para amino benzoic acid (PABA), ethyl dihydroxypropyl PABA, ethylhexyl dimethoxy benzylidene dioxoimidazoline propionate, isoamyl p-methoxycinnamate, isopentyl trimethoxycinnamate trisiloxane, isopropyl benzyl salicylate, isopropyl methoxycinnamate, 4- methylbenzylidene camphor, PEG-25 PABA, and pentyl dimethyl PABA. More preferred oilsoluble UVB sunscreens are selected from one or more of octyl salicylate, 3,3,5-trimethylclohexyl 2-hydroxybenzoate, ethylhexyl salicylate, 2-ethylhexyl 2-cyano-3,3-diphenyl-2-propenoate, and 2-ethylhexyl-4-methoxycinnamate and further more preferred are selected from one or more of 2-ethylhexyl-4-methoxycinnamate, ethylhexyl salicylate and 2-ethylhexyl 2-cyano-3,3-diphenyl- 2-propenoate. Some of the well-known brands under which the above sunscreens are sold are Octisalate®, Homosalate®, Neo Heliopan®, Neo Heliopan® AV, Neo Heliopan® OS, Octocrylene® and Parsol® MCX. These are all oil soluble sunscreens.

[0035] The one or more UVB sunscreens may also be selected from phenyl benzimidazole sulphonic acid (PBSA), benzophenone-4 or benzylidene camphor sulfonic acid, more preferably PBSA. PBSA also known as Ensulizole is commercially available as Eusolex 232 (from Merck KGaA). PBSA is also available under the brand names Neo Heliopan Hydro (from Symrise), Parsol HS (from DSM) and Sunsafe ES (from Uniproma). There are certain sunscreens which have both a UV-A screening efficacy as well as a UVB screening efficacy. Such sunscreens provide both UV- A and UV-B protection e.g. benzophenone-4 (sold as Sulisobenzone). However, for the purposes of the present invention benzophenone- 4 may be included as UV-B sunscreen. These are all water soluble sunscreens.

[0036] Preferably, the one or more UVB sunscreens are selected from ethylhexyl methoxycinnamate, ethylhexyl triazone, ethylhexyl salicylate, phenyl benzimidazole sulphonic acid and mixtures thereof.

[0037] By ‘water soluble’ sunscreens, whether of the UVA type, or of the UVB types described above, it is meant that the solubility in water of the sunscreen is preferably higher than 10 g / L, preferably higher than 50 g / L, at 25°C. By ‘oil-soluble’ sunscreens, whether of the UVA type, or of the UVB types described above, it is preferably meant that the solubility of the sunscreen in water is less than 10 g / L, preferably less than 5 g / L, more preferably less than 2 g / L, at 25°C.

[0038] The water-soluble sunscreens for inclusion in the composition are generally commercially available in the acid form. When included in the composition in the acid form (pre-neutralized forms), i.e. having sulphonic acid group (-SO3H), the composition additionally comprises a neutralizing agent to convert the acid form into the salt form, in which form it is known to be active as a sunscreen with an exception to Mexoryl SX which can act as sunscreen with and without neutralization. When included, a neutralizing agent is preferably included in amounts from 0.05 to 4 wt%, more preferably from 0.2 to 2 wt%. A neutralizing agent is preferably an inorganic or an organic alkali. Organic alkali is preferably an amine such as triethanolamine or diethanolamine. The present inventors have observed that the inorganic alkali is especially preferred. Preferred are alkali metal hydroxides. Most preferred metal hydroxide for inclusion as neutralizing agent in the composition of the invention are sodium hydroxide or potassium hydroxide. Preferably, SPF so obtained is more than 35, more preferably more than 40, even more preferably more than 45 and further more preferably more than 50.

[0039] The composition comprises 5 to 20 wt%, preferably 7 to 18 wt%, more preferably 9 to 15 wt% and even more preferably from 11 to 13 wt% one or more IIV-B sunscreens described above.

[0040] The composition comprises one or more pigments selected from (i) mixtures of mica with titanium dioxide and silica, (ii) mixture of mica with titanium dioxide and tin oxide. More preferably, the pigment selected is a mixture of mica with titanium dioxide and tin oxide.

[0041] Examples of such pigments that are mixtures of mica with titanium dioxide and silica include; and are commercially available as:

[0042] • Timiron® Splendid Gold- Cl 77891 (Titanium Dioxide), Mica, Silica,

[0043] • Timiron® Splendid Red- Cl 77891 (Titanium Dioxide), Mica, Silica,

[0044] • Timiron® Splendid Violet- Cl 77891 (Titanium Dioxide), Mica, Silica.

[0045] Further, examples of such pigments that are mixtures of mica with titanium dioxide and tin oxide include; and are commercially available as:

[0046] • RonaFlair® Balance Red - Cl 77891 (Titanium Dioxide), Mica, Tin Oxide,

[0047] • Timiron® Silk Red- Cl 77891 (Titanium Dioxide), Mica, Tin Oxide.

[0048] Preferably, the average particle size of such pigments is in the range 1 to 50 microns, more preferably in the range 5 to 35 microns and further preferably in the range 5 to 25 microns.

[0049] The composition comprises 3 to 10 wt%, preferably 4 to 9 wt%, more preferably 5 to 8 wt%, even more preferably 6 to 7 wt% of one or more pigments described above.

[0050] It was surprisingly found that when pigments described above were used in the composition, protection from blue light induced damages was obtained.

[0051] Skin brightening compounds

[0052] Preferably, the composition further comprises one or more skin brightening compound selected from niacinamide, picolinamide, isonicotinamide, 4-alkyl substituted resorcinol. Preferably, 4-alkyl substituted resorcinol is selected from 4-ethyl resorcinol (ER), 4-butyl resorcinol (BR), 4-pentyl resorcinol (PR), 4-hexyl resorcinol (HR) and mixtures thereof. More preferably, the composition comprises at least one skin brightening compound selected from niacinamide along with at least one resorcinol compounds described above. For example, the composition preferably further comprises vitamin B3 and HR, vitamin B3 and ER.

[0053] The composition may further comprise additional skin brightening agents selected from arbutin, kojic acid, ferulic acid, hydroquinone, dicarboxylic acids represented by the formula HOOC- (CxHy)-COOH where x=4 to 20 and y=6 to 40 such as azelaic acid, sebacic acid, oxalic acid, succinic acid, fumaric acid, hydroxy stearic acid e.g. 12-hydroxystearic acid, octadecenedioic acid or their salts or a mixture thereof, most preferably fumaric acid or salt thereof, especially di-sodium salt.

[0054] If included in the composition, one or more of these skin brightening compounds are included in an amount ranging preferably from 0.1 to 10 wt%, more preferably from 1 to 8 wt%, even more preferably from 2 to 7 wt% and further more preferably from 3 to 5 wt%.

[0055] Water

[0056] Preferably, the composition comprises from 40 to 70 wt%, more preferably from 45 to 65 wt%, even more preferably from 50 to 60 wt% water.

[0057] The composition is an oil-in-water emulsion.

[0058] Emulsifiers

[0059] Preferably, the composition comprises emulsifiers. Preferably such emulsifiers are selected from a mixture of isostearyl alcohol and butylene glycol cocoate and ethylcellulose (commercially available as Emulfree®CBG), cetyl PEG / PPG-10 / dimethicone, polyglyceryl-4, glycol stearate and glycol distearate, stearyl stearate, polyglyceryl-6 distearate, peg-100 stearate and mixtures thereof. Preferably, the emulsifier selected is a mixture of isostearyl alcohol and butylene glycol cocoate and ethylcellulose. Preferably, the composition comprises from 0.5 to 7 wt%, preferably from 1 to 6 wt%, preferably from 2 to 5 wt%, preferably from 3 to 4 wt% of one or more of these emulsifiers.

[0060] Preferably, the composition is a leave-on composition. For example, a leave-on composition in the form of a liquid, a lotion, a cream, a foam, a stick or a gel. Non-limiting examples of such compositions include leave-on skin lotions, creams, foundations, mascara, sunscreen lotions. More preferably, the composition is a cream. By ‘leave-on’ it is preferably meant that a composition which is not required to be removed from the human body after the application of the composition like e.g. a cream.

[0061] Thickeners can be utilized as part of the cosmetically acceptable carrier of compositions according to the present invention. Typical thickeners include crosslinked acrylates (e.g. Carbopol® 982 and Carbopol® llltrez 10), hydrophobically-modified acrylates (e.g. Carbopol 1382(R)), polyacrylamides (e.g. Sepigel® 305), acryloylmethylpropane sulfonic acid / salt polymers and copolymers (e.g. Aristoflex® HMB and AVC), cellulosic derivatives and natural gums. Natural gums suitable for the present invention include guar, xanthan, sclerotium, carrageenan, pectin and combinations of these gums. Inorganics may also be utilized as thickeners, particularly clays such as bentonites and hectorites, fumed silicas, talc, calcium carbonate and silicates such as magnesium aluminum silicate (Veegum®). Amounts of the thickener may range from 0.0001 to 10 %, usually from 0.001 to 2.5 %, optimally from 0.01 to 1 % by weight of the composition.

[0062] Preferably, the composition further comprises colorants, opacifiers and abrasives. Each of these substances may range from 0.05 to 5 wt%, preferably between 0.1 and 3 wt%.

[0063] Preservatives could be incorporated into the compositions of this invention to protect against the growth of potentially harmful microorganisms. Suitable traditional preservatives for compositions of this invention are alkyl esters of para-hydroxybenzoic acid. Other preservatives which have come into use include hydantoin derivatives, propionate salts, and a variety of quaternary ammonium compounds. Cosmetic chemists are familiar with appropriate preservatives and routinely choose them to satisfy the preservative challenge test and to provide product stability. Particularly preferred preservatives are iodopropynyl butyl carbamate, phenoxyethanol, C1-6 parabens (especially, methyl paraben and / or propyl paraben), imidazolidinyl urea, sodium dehydroacetate and benzyl alcohol. When present in the composition, preservatives are added preferably in an amount 0.001 to 5 wt%, more preferably 0.01 to 3 wt% and most preferably 0.02 to 2 wt%.

[0064] The compositions of the present invention can comprise a wide range of other optional components. The CTFA Cosmetic Ingredient Handbook, Second Edition, 1992, which is incorporated by reference herein in its entirety, describes a wide variety of non-limiting cosmetic and pharmaceutical ingredients commonly used in the skin care industry, which are suitable for use in the compositions of the present invention. Examples include antioxidants, binders, buffering agents, astringents, fragrance, conditioners, skin soothing agents and skin healing agents.

[0065] The composition of the present invention is found to provide protection from blue light induced damages. The composition of the invention has also been found to provide benefits e.g. instant glow, hydration and protection from UV light as shown below. Providing such a composition that comprises considerable amounts of the pigments, oil soluble sunscreens despite the composition contains high amount of water e.g. 45 to 50%, is particularly challenging.

[0066] In a second aspect, the present invention relates to a method of providing protection from blue light induced damages to the skin comprising the steps of (i) applying the composition of the first aspect on to the skin. Preferably, the use is non-therapeutic or cosmetic in nature.

[0067] In another preferred aspect, the present invention relates to a method of providing protection from blue light induced damages to the skin whilst providing an additional benefit e.g. instant glow, moisturization and protection from UV to the skin comprising the steps of (i) applying the composition of the first aspect on to the skin. Preferably, the use is non-therapeutic or cosmetic in nature.

[0068] In step (i), the composition of the first aspect is applied on to a surface e.g. skin. This step may be carried out in such a way that a consumer applies an appropriate quantity of the composition e.g. 2 grams, or in case of liquid products e.g. 5 mL, on to a skin surface. The step of applying the composition may be carried out using hands or may be using applicators e.g. a spatula and a sponge. The composition so applied is spread over the area so as to form a layer of appropriate thickness. Preferably, the method is non-therapeutic or cosmetic in nature.

[0069] In a third aspect, the present invention relates to use of the composition of the first aspect for providing protection from blue light induced damages to the skin. Preferably, the use is non- therapeutic or cosmetic in nature.

[0070] In another preferred aspect, the present invention relates to use of the composition of the first aspect for providing protection from blue light induced damages whilst providing an additional benefit e.g. instant glow, moisturization as well as protection from UV. Preferably, the use is non- therapeutic or cosmetic in nature. In an another preferred aspect, the preset invention relates use of the composition of the first aspect for providing instant glow to the skin. Preferably, such instant glow is provided whilst providing moisturization as well as protection from UV. Preferably, the use is non-therapeutic or cosmetic in nature.

[0071] Examples

[0072] The compositions shown in examples in table 1 below were prepared as follows:

[0073] Briefly the process was divided into 4 major steps. First, a thickener phase was prepared which provided viscosity to the final composition. Second, the oil phase was prepared by melting all the oil phase ingredients at 75°C. Most of the sunscreens were heated and melted expect for one water soluble sunscreen, where additional step of neutralization was done before adding it to the main phase. Parallelly, water phase was prepared and heated at 75°C. After emulsification process, pH of the main batch is adjusted. In the final stage, preservatives and pigments are added at room temperature under continuous stirring.

[0074] Blue light protection assessment

[0075] In-vitro measurement of blue light transmission, from 400 to 450 nm, was conducted using the UV2000S ultraviolet transmittance analyzer which is equipped for measurements from 290 to 450 nm. Sample plates (7 cm x 7 cm) made of roughened PMMA were used. 2 mg / cm2of the sample was applied and spread uniformly on the PMMA plate. After 30 minutes drying time, the plates were scanned for transmittance at 8 different spots, repeated for 2 plates, averaging to a total of 16 readings. A reference scan was done using a blank PMMA plate with glycerin. The transmittance values were used to calculate the percentage of blue light protection using the area under the curve (AUG) method. The percentage of protection is calculated by comparing the AUG of the reference PMMA plate with glycerin to the AUG of the sample PMMA plate with the test sample.

[0076] SPF and UVAPF Measurements

[0077] The invitro SPF and UVAPF values for the compositions were measured using the following procedure:

[0078] Thin film transmittance measurements were done using Labsphere’s Ultraviolet transmittance analyzer. In this study, 70 x 70 mm PMMA plate with ~6 pm roughness from Schonberg GmbH & Co were used. The percent transmittance of the various compositions was measured using a procedure as outlined below. 2 mg / cm2of sample was applied on PMMA plate, distributed uniformly using a syringe, and spread uniformly. The drying time for the PMMA plates was 30 minutes. After the drying time, sample plates were exposed to UV light and transmittance scan was recorded. This scan gives the transmittance as a function of wavelength (290 - 400 nm) for a given sample. For a single plate six to nine different spots were scanned. The same was repeated for 2 or 3 plates. The data reported is thus an average over 12 -18 readings. The reference transmittance scan was obtained using a blank plate, with no sample on the PMMA plates with glycerin spread on it. The transmittance values were used to arrive at the SPF values using the UV -2000s application provided with the instrument.

[0079] Percentage of transmittance (and therefore the SPF) was measured invitro SPF at zero time (line 0 min). Same plate was exposed to solar simulated light and % of transmittance measured at designated time intervals from 0 and 60 min. Average absorbance at 310 and 355 nm was recorded to measure % UVB & UVA photostability respectively. UV was generated using solar simulator (Atlas kW system) using irradiance of 550 W rrr2, at a distance of ~ 20 cm.

[0080] Hydration study

[0081] Briefly, hydration study was carried out as follows:

[0082] A study was conducted to evaluate the skin hydration efficacy of the compositions shown in table 1 below. Skin hydration efficacy study was double blinded, monocentric and non-comparative and efficacy was measured by corneometry. Assessment time points were TO (T zero) which denoted the baseline, T+30 minutes after product application, T+4 hours after product application, T+6 hours after product application, T+8 hours after product application and T+24 hours after product application.

[0083] Average percentages of the variation (Tn-T0) / T0 and standard deviations of the raw values of studied parameter observed for test product and untreated control were calculated at TO, T+30 minutes after product application, T+4 hours after product application, T+6 hours after product application, T+8 hours after product application & T+24 hours after product application, as well as the corresponding statistical results for all the time points (student test or Wilcoxon test, two- tailed for paired groups at 5%, after checking the normality of the distributions by a Shapiro-Wilk test at 1 %).

[0084] Measurement of Instant Glow in terms of AL

[0085] Briefly, AL was measured as follows:

[0086] For instant glow measurements, bio skin (Regina, Japan) was used and was maintained as per the protocols provided by the manufacturer. Compositions shown in table 1 below were applied on to the bio skin. L* values were measured using a chromameter, before applying the composition and after 15 minutes from applying the composition. Instant glow was measured as the difference in L* values before and after the application of the composition as describe earlier. The L* is based on the color measurement presented by Hunter lab color space L* a* and b* where, L* is black-white space, a* is green-red space, b* is blue-yellow space. For example, larger L* value means more white and accordingly larger the AL, more is the instant glow.

[0087] The compositions shown in table 1 below were prepared using methods known in the art.

[0088] Table 1: Compositions as per the present invention (examples 1 to 7); and control (example A)

[0089] Protection from exposure to blue light was assessed as described above; and was found to be as shown in table 2 as follows: Table 2:

[0090] As seen from the data in table 2 above, the composition as per the present invention was found to provide protection from exposure to blue light. Further, protection from UV was measured in terms of protection from IIV-B (measured as SPF) and UV-A (measured as LIVAPF) obtained for example A (control) and examples 1 to 7 (compositions as per the present invention) were measured as described earlier; and were found to be as shown in table 3 below: Table 3: Protection from UV-A (UVAPF) and UV-B (SPF) Further, the composition of example 7 was selected for estimating hydration benefit. Hydration study was carried out as described above. The results obtained were as shown in table 4 below:

[0091] Table 4: Hydration / Moisturization

[0092] Further, L* was measured before a composition was applied; and after 15 minutes from applying the composition. The delta L (AL) was calculated and was found to be as shown in table 5 below.

[0093] Table 5: Instant glow (highlighting effect) measured as delta L (AL)

[0094] The data in tables 2 and that in tables 34 and 5 above showed that the compositions as per the present invention, provided protection from blue light induced damages. Moreover, it also provided additional benefits e.g. instant glow, moisturization and protection from UV.

Claims

Claims1. A personal care composition comprising: a. 0.1 to 10 wt% one or more humectants, b. 0.1 to 10 wt% one or more emollients, c. 1 to 10 wt% one or more UVA sunscreens, d. 5 to 20 wt% one or more UVB sunscreens; and e. 3 to 10 wt% one or more pigments, wherein the one or more pigments are selected from (i) mixtures of mica with titanium dioxide and silica (ii) mixtures of mica with titanium dioxide and tin oxide; and wherein the composition is in the form of oil-in-water emulsion.

2. The composition as claimed in claim 1 wherein the one or more humectants are selected from glycerin, sorbitol, propylene glycol, butylene glycol and mixtures thereof.

3. The composition as claimed in claim 1 or 2 wherein the emollient selected is caprylyl glycol, mineral oils, petrolatum and mixtures thereof.

4. The composition as claimed in any one of claims 1 to 3 wherein the one or more UVA sunscreens are selected from diethylaminohydroxybenzoyl hexylbenzoate, bisethylhexyloxyphenol methoxyphenyl triazine and a dibenzoylmethane compound.

5. The composition as claimed in any one of claims 1 to 4 wherein the one or more UVB sunscreens are selected from ethylhexyl methoxycinnamate, ethylhexyl triazone, ethylhexyl salicylate and phenyl benzimidazole sulphonic acid.

6. The composition as claimed in any one of claims 1 to 5 wherein the particle size of the one or more pigments is in the range 1 to 50 microns.

7. The composition as claimed in any one of claims 1 to 6 wherein the pigment selected is a mixture of mica with titanium dioxide and tin oxide.

8. The composition as claimed in any one of claims 1 to 7 wherein the composition further comprises 0.1 to 10 wt% one or more skin brightening agents selected from niacinamide, picolinamide, isonicotinamide and 4-alkyl substituted resorcinol.

9. The composition as claimed in any one of claims 1 to 8 wherein the composition comprises 40 to 70 wt% water.

10. The composition as claimed in any one of claims 1 to 9 wherein the composition is a leave- on composition, preferably a cream.

11. A method of providing protection from blue light induced damages to the skin comprising the steps of (i) applying the composition as claimed in any one of claims 1 to 10 on to the skin.

12. Use of the composition as claimed in any one of claims 1 to 10 for providing protection from blue light induced damages to the skin.

Images