UV PROTECTION COMPOSITIONS

Abstract: The present invention relates to compositions suitable for providing protection against the harmful effects of ultraviolet radiation. The compositions provide excellent efficiency, broad spectrum UV efficacy, and photostability. Methods of use for these compositions are also disclosed. The present compositions comprise: a) an effective amount of a UVA-absorbing dibenzoylmethane sunscreen active; b) and an effective amount of a naphthalene derivative having formula (I) wherein R is in the 1 or 2 positions and is independently selected from the group consisting of CHO, COOH, COR' wherein R' is a C1- C30 straight or branched alkyl or an aryl, and wherein said naphthalene derivative has a triplet energy state of from about 56 kcal/mol to about 59.5 kcal/mol; and c) a suitable carrier.

Description: UV PROTECTION COMPOSITIONS CROSS REFERENCE TO RELATED APPLICATION This application is a Continuation-ln-Part of Application Serial No. 09/174,225 tiled October 16, 1998. TECHNICAL FIELD The present invention relates to compositions suitable for providing protection against the harmful effects of ultraviolet radiation having excellent efficiency, broad spectrum UV efficacy, and photostability. The compositions comprise a UVA-absorbing dibenzoylmethane sunscreen active, a naphthalene derivative having a triplet energy state from about 56 kcal/mol to about 59.5 kcal/mol, and a suitable carrier. BACKGROUND OF THE INVENTION It is well known that exposure to sunlight can pose a number of hazards to the skin. These damaging effects may result not only from sunbathing but also from the sunlight exposure associated with daily outdoor activities. The major short term hazard of prolonged exposure to sunlight is erythema, i.e., sunburn, which primarily results from UVB radiation having a wavelength of from about 290 nm to about 320 nm. Over the long term, however, malignant changes in the skin surface often occur. Numerous epide inologic studies demonstrate a strong relationship between sunlight exposure and human skin cancer. Another long term hazard of ultraviolet radiation is premature aging of the skin, which is primarily caused by UVA radiation having a wavelength of from about 320 nm to about 400 nm. This condition is characterized by wrinkling and pigment changes of the skin, along with other physical changes such as cracking, telangiectasis, solar dermatoses, ecchymoses, and loss of elasticity. The adverse effects associated with exposure to UV radiation are more fully discussed in DeSimone, "Sunscreen and Suntan Products," Handbook of Nonprescription Drugs, 7th Ed., Chapter 26, pp. 499-51 1 (American Pharmaceutical Association, Washington, D.C.; 1982); Grove and Forbes, "A Method for Evaluating the Photoprotection Action of Sunscreen Agents Against UV-A Radiation," International Journal of Cosmetic Science, 4, pp. 15-24 (1982); and U. S. Patent No. 4,387,089, DePolo, issued June 7, 1983. As a result of the abovementioned hazards associated with sunlight exposure, the general public's interest in the sun protection product market has grown considerably. Today, there are not only sunscreen products for sunbathing but there are also a variety of personal care products containing sunscreens, particularly cosmetic type products which are worn daily. "Personal care products" refer to health and cosmetic beauty aid products generally recognized as being formulated for beautifying and grooming the skin and hair. For example, personal care products include sunscreen products (e.g., lotions, skin creams, etc.), cosmetics, toiletries, and over-the-counter pharmaceutical products intended for topical usage. Many conventional sunscreen products, in particular, are deficient, however, due to their inability to provide efficacious protection agamst broad spectrum UV radiation, 1 e , protection against both UVB and UVA radiation Today, most commercially available sunscreen products are efficient at absorbing UV radiation in the 290 nm to 320 nm UVB region such that sunburn of the skin is prevented They are less efficient when it comes to absorbing light which falls in the 320 nm to 400 nm UVA region, which leaves the skin vulnerable to premature skin aging This deficiency is due in part to the limited number of UVA absorb mg sunscreen actives which are both commercially available and approved for global use One class of these sunscreen actives includes dibenzoylmethane compounds which provide broad spectrum UV protection and 4-tert-butyl-4'-methoxydιbenzoylmethane, in particular, is also approved for global use Unfortunately, these sunscreens tend to photodegrade upon exposure to UV radiation thereby reducing their UVA efficacy Consequently, sunscreen products which include these compounds are typically more difficult to formulate due to the inherent lack of photostability of dibenzoylmethane compounds One approach to stabilize these types of sunscreens is descπbed in U S Seπal No 07/929,612, Deckner, filed August 13, 1992, involving the use of benzyhdene camphor sunscreens to stabilize the dibenzoylmethane compound Such compositions, however, are not currently approved for global use on humans Thus, there is a need for photostabilized compositions suitable for providmg protection agamst the harmful effects of UV radiation to human skin In particular, in the personal care industry, a need remains for sunscreen products having excellent photostability, efficiency, and which provide broad spectrum UV protection (1 e , against both UVA and UVB radiation) in a safe and economical manner Likewise, in other industries such as the automotive care, marine vehicle care, household care, animal care, and coatings industries, UV radiation causes undesirable wear and damage Therefore, a need exists for photostabilized compositions suitable for providing protection agamst the harmful effects of UV radiation to a variety of objects and/or materials prone to sun exposure It has surprisingly now been found that the compositions of the present invention, which comprise a UVA-absorbing dibenzoylmethane sunscreen active, a naphthalene derivative, and a suitable earner, provide excellent photostability, efficiency, and UV protection efficacy (mcludmg both UVA and UVB protection), in a safe and economical manner SUMMARY OF THE INVENTION The present mvention relates to a composition suitable for providmg protection against the harmful effects of ultraviolet radiation compnsing a) an effective amount of a UVA-absorbing dibenzoylmethane sunscreen active, b) an effective amount of a naphthalene denvative having the formula wherein R is m the 1 or 2 position and is independently selected from the group consistmg of CHO, COOH, COR' wherem R' is a Ci - C 30 straight or branched alkyl or an aryl. and wherein said naphthalene derivative has a triplet energy state of from about 56 kcal mol to about 59 5 kcal/mol, and c) a suitable earner In preferred embodiments, the UVA-absorbmg dibenzoylmethane sunscreen active and the naphthalene derivative are present in "safe and effective" amounts and the mole ratio of the UVA-absorbmg dibenzoylmethane sunscreen active to the naphthalene denvative is from about 8 1 to about 1 1, more preferably from about 4 1 to about 1 1, and most preferably from about 2 1 to about 1 1 The present invention also relates to methods for providmg protection to skin from the harmful effects of UV radiation by topical application of such compositions Furthermore, the present invention relates to methods of stabilizing a UVA-absorbing dibenzoylmethane sunscreen active DETAILED DESCRIPTION OF THE INVENTION The compositions of the present invention are useful for providmg protection against the harmful effects of ultraviolet radiation, especially to human skin The essential components of these compositions are described below Also included is a nonexclusive descnption of vanous optional and prefened components useful in embodiments of the present invention The present invention can comprise, consist of, or consist essentially of any of the required or optional ingredients and/or limitations descπbed here All percentages and ratios are calculated on a weight basis unless otherwise indicated All percentages are calculated based upon the total composition unless otherwise indicated All molar weights are weight average molecular weights and are given m units of grams per mole All ingredient levels are in reference to the active level of that ingredient, and are exclusive of sohents, by-products, or other impurities that may be present in commercially available sources, unless otherwise indicated All measurements made are at ambient room temperature, which is approximately 73 C F, unless otherwise designated All documents refened to herein, including patents, patent applications, and printed publications, are hereby incorporated by reference their entirety in this disclosure By "safe and effective amount" is meant an amount of a compound, component, or composition (as applicable) sufficient to significantly duce a positive effect (e g , photoprotection or improvement in photostability), but low enough to avoid senous side effects, (e g , undue toxicity or allergic reaction), l e , to provide a reasonable benefit to nsk ratio, within the scope of sound medical judgment By "effective amount" is meant an amount of a compound, component, or composition (as applicable) sufficient to significantly induce a positive effect (e g , photoprotection or improvement in photostability) UVA-Absorbing Dibenzoylmethane Sunscreen Active The compositions of the present invention comprise a UVA-absorbing dibenzoylmethane sunscreen active which absorbs UV radiation having a wavelength of from about 320 nm to about 400 nm. Prefeπed UVA-absorbing dibenzoylmethane sunscreen actives have the general structure wherein R is a substituent selected from the group consisting of H, OR, and NRR wherein each R is independently H, or C, - C 20 straight or branched alkyls, R 2 is selected from the group consisting of H or OH, and R 3 is selected from the group consisting of H, or Ci - C 20 straight or branched alkyls. Even though the dibenzoylmethane chromophore is represented as a 1 ,3-diketone, it should be understood that this representation in no way excludes other tautomeric forms of the functional group such as the enol form. Thus, whenever the 1 ,3-diketone form is designated, it is understood that all appropriate enol tautomers are also contemplated and included herein. These tautomeric enol forms of the dibenzoylmethane chromophore can be represented by the following tautomeric structures. wherein R,, R 2 , and R 3 are defined as above. Examples of such UVA-absorbing dibenzoylmethane sunscreen actives are described in U. S. Patent No. 4,489,057, issued to Welters et al. on December 18, 1984 and U. S. Patent No. 4,387,089, issued to Depolo on June 7, 1983; and in Sunscreens: Development, Evaluation, and Regulatory Aspects, edited by N. J. Lowe and N. A. Shaath, Marcel Dekker, Inc. ( 1990). Suitable UVA-absorbing dibenzoylmethane sunscreen actives include, but are not limited to, those selected from the group consisting of 2-methyldibenzoylmethane, 4-methyldibenzoylmethane, 4- isoprop ldibenzoylmethane, 4-tert-butyldibenzoylmethane, 2,4-dimethyldibenzoylmethane, 2,5- dimethyldibenzoylmethane, 4,4'-diisopropylbenzoylmethane, 4-tert-butyl-4'-methoxydibenzoylmethane, 2- methyl-5-isopropyl-4'-methoxydibenzoylmethane, 2-methyl-5-ten-butyl-4'-methoxydibeπzoylmethane, 2,4- dimethyl-4'-methoxydibenzoylmethane, 2,6-dimethyl-4'tert-butyl-4'methoxydibenzoylmethane, and mixtures thereof. Prefeπed UVA-absorbing dibenzoylmethane sunscreen actives include those selected from the group consisting of 4-tert-butyl-4'-methoxydibenzoylmethane, isopropyldibenzoylmethane, and mixtures thereof A more preferred UVA-absorbmg dibenzoylmethane sunscreen active is 4-tert-butyl-4'- methoxydibenzoylmethane The sunscreen active, 4-tert-butyl-4'-methoxydιbenzoylmethane, which is also known as butyl methoxydibenzoylmethane or Avobenzone, is commercially available under the names Parsol® 1789 from Givaudan-Roure (International) S A (Basel, Switzerland) and Eusolex® 9020 from Merck & Co , Inc (Whitehouse Station, NJ) The sunscreen 4-ιsopropyldιbenzoylmethane, which is also known as isopropyl dibenzoylmethane, is commercially available from Merck under the name Eusolex 8020. The UVA-absorbmg dibenzoylmethane sunscreen active of the instant mvention is present in an effective amount, preferably in a safe and effective amount, to provide broad spectrum UV protection either independently or in combination with other UV protective actives which may be present in the composition The composition preferably contains from about 0 01% to about 30%, more preferably from about 0 1% to about 6%, and most preferably from about 1% to about 3%, by weight of the composition, of the UVA- absorbmg dibenzoylmethane sunscreen active Exact amounts of the sunscreen active will vary dependmg upon the desired Sun Protection Factor, l e , the "SPF" of the composition as well as the desired level of UVA protection (SPF is a commonly used measure of photoprotection of a sunscreen agamst erythema The SPF is defined as the ratio of the ultraviolet energy required to produce minimal erythema on protected skin to that required to produce the same minimal erythema on unprotected skin in the same individual See Federal Register, 43, No 166, pp 38206-38269, August 25, 1978) Naphthalene Derivative T e compositions of the present invention also compnse a naphthalene denvative having the formula wherein R is in the 1 or 2 position and is independently selected from the group consisting of CHO, COOH, COR' wherein R' is a C, - C 30 straight or branched alkyl or aryl, and wherein said naphthalene derivative has a tnplet energy state of from about 56 kcal/mol to about 59 5 kcal/mol As used herein, "alkyl" means carbon-containing chains which may be straight, branched or cyclic, substituted or unsubstituted, saturated, monounsaturated (I e one double or tnple bond in the carbon chain), or polyunsaturated (I e two or more double bonds in the carbon chain, two or more tnple bonds in the carbon chain, one or more double and one or more triple bonds in the carbon chain) Unless otherwise indicated, alkyl are preferably as follows Prefeπed alkyl are straight or branched cham, more preferably straight chain Prefeπed alkyl are mono-, di-, or tn- substituted, or unsubstituted, most preferably unsubstituted Prefeπed alkyl are saturated or monounsaturated and, if so, preferably with a double bond, more preferably alkyl are saturated Prefeπed alkyls are C r C 30 , more preferably CJ -CJ Q, also more preferably C j -C even more preferably methyl, ethyl and t-butyl, even still more preferably methyl and ethyl, and most preferably methyl Thus the term "substituted alkyl" is included in the definition of alkyl Prefeπed alkyl substituents (I e substitution on alkyls) include ester, ketone, aldehyde, carboxyhc acid, halo, aryl, am o, hydroxy, alkoxy, cyano, nitro, amino (including mono- and disubstituted ammo), thiol, and substituted thiol and tnfluoromethyl More prefeπed alkyl substituents are ester and aryl As used herein the term "alkoxy" mcludes the above descπbed alkyl radicals attached to the molecule via oxygen Thus, alkyl not only includes the CJ -CJ Q alkoxy, but also includes species such as methylenedioxy, ethylenedioxy and other similarly bifunctional, or multifunctional alkoxy substituents These multifunctional substituents can be attached to vanous places in the molecule and thus form bridged species For example, species such as dioxolanes, dioxanes and the like are specifically contemplated As used here "halo" means F, CI, Br, and I Prefeπed "halos" are F, CI, and Br, more preferably F and CI, most preferably F. As used herein, "aryl" means aromatic rings which may be unsubstituted or substituted Prefeπed aryl are phenyl or naphthyl, especially phenyl Prefeπed aryl are mono-, di-, tn- substituted or unsubstituted, more prefeπed aryl are monosubstituted or unsubstituted, most prefeπed being unsubstituted Prefeπed aryl substituents include ester, ketone, aldehyde, carboxyhc acid, alkyl, halo, ammo, hydroxy, alkoxy, cyano, nitro and tnfluoromethyl More prefeπed aryl substituents are alkyl and ester The most prefeπed aryl is unsubstituted and thus is phenyl Tnplet energy levels may be determined via phosphorescence or oxygen perturbation techniques as described by J Gonzenbach, T J Hill, and T G Truscott in "The Tnplet Energy Levels of UVA and UVB Sunscreens", J Photochem Photobiol B Biol , vol 16, pp.377-379 ( 1992), which is incorporated by reference herem in its entirety The oxygen perturbation technique involves measuring the UV absorption spectrum of a compound while that compound is under an oxygen enhanced high pressure environment, e.g , 2000 psi Under these conditions, spin selection rules break down and exposure of the compound to UV generates the lowest excited tnplet state directly from the ground state. The wavelength, λ (m μm), at which this transition occurs is used to calculate the energy of the tnplet (tnplet energy level) m kcal/mol using the relationship of E = 28 635/λ which is denved from the equation E = hv wherein E is energy, h is Planck's constant , and v is the frequency of the electromagnetic radiation The phosphorescence technique focuses on the fact that many compounds phosphoresce when UV generated excited tπplets decay By measuring the wavelength at which phosphorescence occurs, the tnplet energy level may be calculated as descπbed above Triplet energy levels may be determined by measuring phosphorescence spectra of test samples with a UV spectrophotometer which is equipped with a phosphorescence attachment. Such tnplet energy levels have been widely reported, e.g., see A J Gordon, R A Ford, "The Chemist's Compamon," John Wiley & Sons, pp 351-355 (1972), which is incorporated by reference herein in its entirety Preferably, the naphthalene denvative is selected from the group consisting of: 1 -naphthaldehyde 2-naphthaldehyde -acetonaphthone O l-naphthoic acid l-acetonaphthone and mixtures thereof More preferably, the naphthalene denvative is selected from the group consisting of 1 -naphthaldehyde, l -acetonaphthone, and mixtures thereof Most preferably, the naphthalene denvative is l -acetonaphthone Suitable naphthalene deπvatives are commercially available from Aldnch Chemical Co , Inc (Milwaukee, WI) The naphthalene denvative improves the photostability of the dibenzoylmethane sunscreen active and of the compositions of the present mvention The naphthalene deπvanve of the present mvention is present in an effective amount, preferably in a safe and effecnve amount, to reduce the photodegradation of the UVA-absorbing dibenzoylmethane sunscreen active Photodegradation refers to the appreciable breakdown of a compound upon exposure to UV radianon Photodegradation may be determined by a reduction of the UV absorption capability which m rum may be measured by using standard UV absorption methods Prefeπed compositions retain at least about 75%, more preferably at least about 85%, and most preferably at least about 95%, of their initial UV absorption after lπadiation with approximately 2 J/cm 2 per desired SPF unit of broad band UV radiation, e g , 30 J/cm 2 for an SPF 15 composition Preferably, the naphthalene denvative is present m an amount such that the mole ratio of the UVA-absorbmg dibenzoylmethane sunscreen active to the naphthalene denvative is from about 8 1 to about 1 1, more preferably from about 4 1 to about 1 1 , and most preferably from about 2 1 to about 1 1 Carrier The compositions of the present mvention compnse a suitable earner or vehicle for the UVA- absorbmg dibenzoylmethane sunscreen active, the naphthalene denvative, and any optional components Suitable earners are well known in the art and are selected based on the end use application For example, earners of the present invennon include, but are not limited to, those suitable for apphcanon to skin, hair, nails, animal skin, fur, automobiles, fabπcs, marine vehicles, as well as those suitable for incorporation into plastics, metals, etc Preferably, the earners of the present mvention are suitable for application to skin (e g , sunscreens, creams, milks, lotions, masks, serums, etc ), hair and fur (e g , shampoos, hair setting or treatment gels or lotions, shaping/curhng/fixation lacquers or lotions, etc,), and nails (e g , polishes, treatments, etc ) In prefeπed embodiments, the earner is suitable for application to skin which means that the earner and its components are suitable for use in contact with skin, hair, fur, and nails without undue toxicity, incompatibility, instability, allergic response, and the like within the scope of sound medical judgment Such caπiers are well-known to one of ordinary skill m the art, and can mclude one or more compatible liquid or solid filler diluents or vehicles which are suitable for application to skin, hair, fur, and nails The exact amount of earner will depend upon the level of the UVA-absorbmg dibenzoylmethane sunscreen active, the naphthalene denvative and any other optional ingredients which one of ordinary skill in the art would classify as distinct from the earner (e g , other active components) The compositions of the present invention preferably compnse from about 20% to about 99 8%, more preferably from about 50% to about 99%, and most preferably from 75% to about 95%, by weight of the composition, of a earner The earner and compositions herein can be formulated m a number of ways, including but not limited to emulsions (in emulsion technology, a composition compnsing a "dispersed phase" and a "continuous phase," the dispersed phase existing as small particles or droplets that are suspended in and suπounded by a continuous phase) For example, suitable emulsions mclude oil-in-water, water-in-oil, water- m-oil-in-water, oil-in-water-m-oil, and oil-in-water-in-sihcone emulsions Prefeπed compositions compnse an oil-in-water emulsion The compositions of the present invention can be formulated into a wide vanety of product types, including creams, waxes, pastes, lotions, milks, mousses, gels, oils, tomes, and sprays Prefeπed compositions are formulated mto lotions, creams, gels, and sprays These product forms may be used for a number of applications, mcludmg, but not limited to, hand and body lotions, cold creams, facial moisturizers, anti-acne preparations, topical analgesics, make-ups cosmetics mcludmg foundations, eyeshadows, lipsticks, and the like as well as coatings (e g , paints, varnishes, polishes, adhesives, etc.), household care items (e g , detergents, cleansers, fabnc conditioners, etc ), automotive and marine vehicle care items (e g , waxes, etc ), hair care and styling products (e g , shampoos, conditioners, gels, mousses, sprays, etc ), topical animal care items (e g , shampoos, conditioners, skin treatments, etc ) Any additional components required to formulate such products vary with product type and can be routmely chosen by one skilled in the art If compositions of the present invention are formulated as an aerosol and applied to the skin as a spray-on product, a propellant is added to the composition. Examples of suitable propellants include chlorofluorinated lower molecular weight hydrocarbons. A more complete disclosure of propellants useful herein can be found in Sagarin, Cosmetics Science and Technology. 2nd Edition, Vol. 2, pp. 443-465 (1972). Optional Components The compositions of the present invention may contain a variety of other ingredients such as are conventionally used in a given product type provided that they do not unacceptably alter the benefits of the invention. In a prefeπed embodiment, where the composition is to be in contact with human skin, the optional components should be suitable for application to skin, that is, when incorporated into the composition they are suitable for use in contact with human skin without undue toxicity, incompatibility, instability, allergic response, and the like within the scope of sound medical judgment. The CTFA Cosmetic Ingredient Handbook, Second Edition (1992) describes a wide variety of nonlimiting cosmetic and pharmaceutical ingredients commonly used in the skin care industry, which are suitable for use in the compositions of the present invention. Examples of these ingredient classes include: abrasives, absorbents, aesthetic components such as fragrances, pigments, colorings/colorants, essential oils, skin sensates, astringents, etc. (e.g., clove oil, menthol, camphor, eucalyptus oil, eugenol, menthyl lactate, witch hazel distillate), anti-acne agents, anti-caking agents, antifoaming agents, antimicrobial agents (e.g., iodopropyl butylcarbamate), antioxidants, binders, biological additives, buffering agents, bulking agents, chelating agents, chemical additives, colorants, cosmetic astringents, cosmetic biocides, denaturants, drug astringents, external analgesics, film formers or materials, e.g., polymers, for aiding the film-forming properties and substantivity of the composition (e.g., copolymer of eicosene and vinyl pyπolidone), opacifying agents, pH adjusters, propellants, reducing agents, sequestrants, skin bleaching and lightening agents (e.g., hydroquinone, kojic acid, ascorbic acid, magnesium ascorbyl phosphate, ascorbyl glucosamine), skin-conditioning agents (e.g., humectants, including miscellaneous and occlusive), skin soothing and/or healing agents (e.g., panthenol and derivatives (e.g., ethyl panthenol), aloe vera, pantothenic acid and its derivatives, allantoin, bisabolol, and dipotassium glycyπhizinate), skin treating agents, thickeners, and vitamins and derivatives thereof. The compositions of the present invention may contain one or more of such optional components. Prefeπed compositions optionally contain one or more materials selected from UVB sunscreen actives, anti- acne actives, vitamin compounds, skin treating agents, humectants, moisturizers, skin conditioners, thickening agents, structuring agents, and emulsifiers. In any embodiment of the present invention, however, the actives useful herein can be categorized by the benefit they provide or by their postulated mode of action. However, it is to be understood that the actives useful herein can in some instances provide more than one benefit or operate via more than one mode of action. Therefore, classifications herein are made for the sake of convenience and are not intended to limit the active to that particular application or applications listed. a) UVB Sunscreen Active The compositions of the present invention may comprise one or more UVB sunscreen actives which absorb UV radiation having a wavelength of from about 290 nm to about 320 n . As used herein the UVB sunscreen active means an active other than the UVA-absorbing dibenzoylmethane sunscreen active which itself may possess UVB absorption properties. The compositions comprise an amount of the UVB sunscreen active which is safe and effective to provide UVB protection either independently or in combination with other UV protective actives which may be present in the composition, preferably from about 0.1% to about 30%, more preferably from about 0.5% to about 25%, and most preferably from about 1% to about 20% by weight of the composition. A wide variety of UVB sunscreen actives, including both organic sunscreen actives and inorganic physical sunblocks, are suitable for use herein. Nonlimiting examples of such sunscreen actives are described in U. S. Patent No. 5,087,445 issued February 11, 1992 to Haffey et al; and U. S. Patent Nos. 5,073,371 and 5,073,372, both issued on December 17, 1991 to Turner et al Nonlimiting examples of suitable physical sunblocks are described in CTFA International Cosmetic Ingredient Dictionary, Sixth Edition, 1995, pp. 1026-28 and 1 103. Prefeπed UVB sunscreen actives are selected from the gτoup consisting of 2-phenyl-benzimidazole- 5-sulfonic acid, octyl methoxycinnamate, TEA salicylate, octyl salicylate, octyl dimethyl PABA, zinc oxide, titanium dioxide, and mixtures thereof. A prefeπed water-soluble organic sunscreen active is 2-phenyl- benzimidazole-5-sulfonic acid while prefeπed inorganic physical sunblocks are zinc oxide, titanium dioxide, and mixtures thereof. Salt and acid-neutralized forms of the acidic sunscreens are also useful herein. b) Anti-Acne Actives The compositions of the present invention may comprise one or more anti-acne actives. Examples of useful anti-acne actives include resorcinol, sulfur, salicylic acid, erythromycin, zinc, etc. Further examples of suitable anti-acne actives are described in further detail in U. S. Patent No. 5,607,980, issued to McAtee et al, on March 4, 1997. c) Vitamin Compounds The compositions of the present invention may comprise vitamin compounds, precursors, and derivatives thereof. These vitamin compounds may be in either natural or synthetic form. Suitable vitamin compounds include, but are not limited to, Vitamin A (e.g., beta carotene, retinoic acid, retinol, retinoids, retinyl palmitate, retinyl proprionate, etc.), Vitamin B (e.g., niacin, niacinamide, riboflavin, pantothenic acid, etc.), Vitamin C (e.g., ascorbic acid, etc.), Vitamin D (e.g., ergosterol, ergocalciferol, cholecalciferol, etc.), Vitamin E (e.g., tocopherol acetate, etc.), and Vitamin K (e.g., phytonadione, menadione, phthiocol, etc.) compounds. In particular, the compositions of the present mvention may compnse a safe and effective amount of a vitamin B3 compound Vitamin B 3 compounds are particularly useful for regulating skin condition as descnbed m co-pendmg U S Apphcanon Senal No 08/834,010, filed Apπl 1 1, 1997 (coπesponding to mtemational publication WO 97/39733 A 1, published October 30, 1997) which is incorporated by reference herem m its entirety The compositions of the present mvention preferably compnse from about 0 01% to about 50%, more preferably from about 0 1% to about 10%, even more preferably from about 0 5% to about 10%, and still more preferably from about 1 % to about 5%, most preferably from about 2% to about 5%, of the vitamin B3 compound As used herem, "vitamin B3 compound" means a compound having the formula where R is - CONH2 (1 e , niacinamide), - COOH (1 e , nicotinic acid) or - CH2OH (1 e , nicohnyl alcohol), denvatives thereof, and salts of any of the foregomg Exemplary denvatives of the foregoing vitamin B3 compounds include nicotinic acid esters, including non-vasodilating esters of nicotinic acid, nicotmyl ammo acids, nicotinyl alcohol esters of carboxyhc acids, nicon c acid N-oxide and niacinamide N-oxide Examples of suitable vitamin B3 compounds are well known in the art and are commercially available from a number of sources, e g , the Sigma Chemical Company (St Louis, MO), ICN Biomedicals, Inc (Irvin, CA) and Aldnch Chemical Company (Milwaukee, WI) The vitamin compounds may be included as the substantially pure matenal, or as an extract obtained by suitable physical and/or chemical isolation from natural (e g , plant) sources d) Skin Treating Agent The compositions of the present mvention may contain one or more skin treating agents Suitable skin treating agents mclude those effective for preventing, retarding, aπeshng, and/or reversing skin wrinkles Examples of suitable skin treating agents mclude, but are not limited to, alpha-hydroxy acids such as lactic acid and glycohc acid and beta-hydroxy acids such as salicylic acid e) Structuring Agent The compositions of the present mvention may contain a structuring agent such as are known in the art Structuring agents are particularly prefeπed in the oil-in-water emulsions of the present mvention Without being limited by theory, it is believed that the structuring agent assists m providmg rheological charactenstics to the composition which contnbute to the stability of the composition For example, the structuring agent tends to assist in the formation of the liquid crystalline gel network structures The structuring agent may also funcnon as an emulsifier or surfactant Prefeπed compositions of this mvention compnse from about 0 5% to about 20%, more preferably from about 1% to about 10%, most preferably from about 1% to about 5%, of one or more structuring agents The prefeπed structurmg agents of the present mvention are selected from the group consistmg of steanc acid, palmitic acid, stearyl alcohol, cetyl alcohol, behenyl alcohol, steanc acid, palmitic acid, the polyethylene glycol ether of stearyl alcohol havmg an average of about 1 to about 21 ethylene oxide units, the polyethylene glycol ether of cetyl alcohol havmg an average of about 1 to about 5 ethylene oxide units, and mixtures thereof More prefeπed structurmg agents of the present mvention are selected from the group consistmg of stearyl alcohol, cetyl alcohol, behenyl alcohol, the polyethylene glycol ether of stearyl alcohol having an average of about 2 ethylene oxide units (steareth-2), the polyethylene glycol ether of stearyl alcohol havmg an average of about 21 ethylene oxide units (steareth-21), the polyethylene glycol ether of cetyl alcohol havmg an average of about 2 ethylene oxide units, and mixtures thereof. Even more prefeπed structurmg agents are selected from the group consistmg of steanc acid, palmitic acid, stearyl alcohol, cetyl alcohol, behenyl alcohol, steareth-2, steareth-21, and mixtures thereof. f) Thickening Agent (including thickeners and gelling agents) The compositions of the present mvention can compnse one or more thickening agents, preferably from about 0.1 % to about 5%, more preferably from about 0 1% to about 3%, and most preferably from about 0 25% to about 2%, by weight of the composition Nonlimiting classes of thickening agents mclude those selected from the group consistmg of: (I) Carboxyhc Acid Polymers These polymers are crosshnked compounds containing one or more monomers denved from acrylic acid, substituted acrylic acids, and salts and esters of these acrylic acids and the substituted acrylic acids, wherein the crosslmking agent contains two or more carbon-carbon double bonds and is denved from a polyhydnc alcohol Polymers useful in the present invention are more fully descπbed m U S. Patent No 5,087,445, to Haffey et al, issued February 1 1, 1992, U. S. Patent No 4,509,949, to Huang et al, issued Apnl 5, 1985; U. S. Patent No. 2,798,053, to Brown, issued July 2, 1957; and m CTFA International Cosmetic Ingredient Dictionary, Fourth Edition, 1991, pp. 12 and 80. Examples of commercially available carboxyhc acid polymers useful herem mclude the carbomers, which are homopolymers of acrylic acid crosslmked with allyl ethers of sucrose or pentaerytntol. The carbomers are available as the Carbopol® 900 senes from B.F Goodrich (e.g., Carbopol® 954). In addinon, other suitable carboxyhc acid polymenc agents mclude copolymers of Cj 9.30 alkyl acrylates with one or more monomers of acrylic acid, methacryhc acid, or one of their short chain (i.e., C j _4 alcohol) esters, wherein the crosslinking agent is an allyl ether of sucrose or pentaerytntol. These copolymers are known as acrylates/C 10 - 30 alkyl acrylate crosspolymers and are commercially available as Carbopol® 1342, Carbopol® 1382, Pemulen TR-1, and Pemulen TR-2, from B.F. Goodnch. In other words, examples of carboxyhc acid polymer thickeners useful herem are those selected from the group consistmg of carbomers, acrylates/C| 0 -C 3 o alkyl acrylate crosspolymers, and mixtures thereof. (li) Crosshnked Polvacrylate Polymers The compositions of the present invention can optionally comprise crosshnked polyacrylate polymers useful as thickeners or gelling agents including both cationic and nonionic polymers, with the cationics being generally prefeπed. Examples of useful crosshnked nonionic polyacrylate polymers and crosshnked cationic polyacrylate polymers are those described in U. S. Patent No. 5,100,660, to Hawe et al, issued March 31, 1992; U. S. Patent No. 4,849,484, to Heard, issued July 18, 1989; U. S. Patent No. 4,835,206, to Faπar et al, issued May 30, 1989; U.S. Patent No. 4,628,078 to Glover et al issued December 9, 1986; U.S. Patent No. 4,599,379 to Flesher et al issued July 8, 1986; and EP 228,868, to Farrar et al, published July 15, 1987. (iii) Polvacrylamide Polymers The compositions of the present invention can optionally comprise polyacrylamide polymers, especially nonionic polyacrylamide polymers including substituted branched or unbranched polymers. Most prefeπed among these polyacrylamide polymers is the nonionic polymer given the CTFA designation polyacrylamide and isoparaffin and laureth-7, available under the Tradename Sepigel 305 from . Seppic Corporation (Fairfield, NJ). Other polyacrylamide polymers useful herein include multi-block copolymers of acrylamides and substituted acrylamides with acrylic acids and substituted acrylic acids. Commercially available examples of these multi-block copolymers include Hypan SR150H, SS500V, SS500W, SSSA100H, from Lipo Chemicals, Inc., (Patterson, NJ). (iv) Polvsaccharides A wide variety of polysaccharides are useful herein. "Polysaccharides" refer to gelling agents which contain a backbone of repeating sugar (i.e., carbohydrate) units. Nonlimiting examples of polysaccharide gelling agents include those selected from the group consisting of cellulose, carboxymethyl hydroxyethylcellulose, cellulose acetate propionate carboxylate, hydroxyethylcellulose, hydroxyethyl ethylcellulose, hydroxypropylcellulose, hydroxypropyl methylcellulose, methyl hydroxyethylcellulose, microcrystalline cellulose, sodium cellulose sulfate, and mixtures thereof. Also useful herein are the alkyl substituted celluloses. In these polymers, the hydroxy groups of the cellulose polymer is hydroxyalkylated (preferably hydroxyethylated or hydroxypropylated) to form a hydroxyalkylated cellulose which is then further modified with a 0 -C 30 straight chain or branched chain alkyl group through an ether linkage. Typically these polymers are ethers of C 10 -C 30 straight or branched chain alcohols with hydroxyalkylcelluloses. Examples of alkyl groups useful herein include those selected from the group consisting of stearyl, isostearyl, lauryl, myristyl, cetyl, isocetyl, cocoyl (i.e. alkyl groups derived from the alcohols of coconut oil), palmityl, oleyl, linoleyl, linolenyl, ricinoleyl, behenyl, and mixtures thereof. Prefeπed among the alkyl hydroxyalkyl cellulose ethers is the material given the CTFA designation cetyl hydroxyethylcellulose, which is the ether of cetyl alcohol and hydroxyethylcellulose. This material is sold under the tradename Natrosol® CS Plus from Aqualon Corporation (Wilmington, DE). Other useful polysaccharides mclude scleroglucans compnsing a linear cham of (1-3) linked glucose units with a (1-6) linked glucose every three units, a commercially available example of which is Clearogel™ CS1 1 from Michel Mercier Products Inc (Mountainside, NJ). (v) Gums Other thickening and gelling agents useful herem mclude matenals which are pnmanly denved from natural sources. Nonlimiting examples of these gelling agent gums mclude matenals selected from the group consistmg of acacia, agar, algin, algmic acid, ammonium algmate, amylopechn, calcium algmate, calcium caπageenan, caπunne, caπageenan, dextrin, gelatin, gellan gum, guar gum, guar hydroxypropyltnmo um chlonde, hectonte, hyaluromic acid, hydrated silica, hydroxypropyl chitosan, hydroxypropyl guar, karaya gum, kelp, locust bean gum, natto gum, potassium algmate, potassium caπageenan, propylene glycol algmate, sclerotium gum, sodium carboyxmethyl dextran, sodium caπageenan, tragacanth gum, xanthan gum, and mixtures thereof. Prefeπed compositions of the present mvention mclude a thickening agent selected from the group consisting of carboxyhc acid polymers, crosslinked polyacrylate polymers, polyacrylamide polymers, and mixtures thereof, more preferably selected from the group consistmg of carboxyhc acid polymers, polyacrylamide polymers, and mixtures thereof. g) Humectants, Moisturizers, and Skin Conditioners Prefeπed compositions optionally compnse one or more humectants, moisturizers, or skin conditioners. A vanety of these matenals can be employed and each can be present at a level of from about 0 01 % to about 20%, more preferably from about 0.1 % to about 10%, and most preferably from about 0.5% to about 7%. These matenals include, but are not limited to, guanidme; glycohc acid and glycolate salts (e.g. ammonium and quaternary alkyl ammonium); salicylic acid, lactic acid and lactate salts (e.g., ammonium and quaternary alkyl ammonium); aloe vera in any of its vanety of forms (e.g., aloe vera gel); polyhydroxy alcohols such as sorbitol, glycerol, hexanetnol, propylene glycol, butylene glycol, hexylene glycol and the like; polyethylene glycols; sugars and starches; sugar and starch denvatives (e.g., alkoxylated glucose), hyaluronic acid; lactamide monoethanolamine; acetamide monoethanolamme; and mixtures thereof Also useful herem are the propoxylated glycerols described in U. S. Patent No. 4,976,953, to Oπ et al, issued December 1 1, 1990. Also useful are vanous C|-C 3 o monoesters and polyesters of sugars and related matenals. These esters are denved from a sugar or polyol moiety and one or more carboxyhc acid moieties. Such ester matenals are further described in, U. S. Patent No. 2,831,854, U S. Patent No 4,005,196, to Jandacek, issued January 25, 1977; U. S. Patent No 4,005,195, to Jandacek, issued January 25, 1977, U. S. Patent No. 5,306,516, to Letton et al, issued Apnl 26, 1994; U. S. Patent No. 5,306,515, to Letton et al, issued April 26, 1994, U. S. Patent No. 5,305,514, to Letton et al, issued Apnl 26, 1994; U. S. Patent No. 4,797,300, to Jandacek et al, issued January 10, 1989, U. S Patent No 3,963,699, to Puzzi et al, issued June 15, 1976; U. S. Patent No. 4,518,772, to Volpenhein, issued May 21, 1985; and U. S. Patent No. 4,517,360, to Volpenhein, issued May 21, 1985. h) Emulsifiers The compositions of the present invention can comprise one or more emulsifiers, e.g., to reduce the interfacial tension between phases and improve the formulation and stability of an emulsion. Suitable emulsifiers include a wide variety of nonionic, cationic, anionic, and zwitterionic emulsifiers. See McCutcheon's, Detergents and Emulsifiers, North American Edition (1986), published by Allured Publishing Corporation; U. S. Patent No. 5,01 1,681 issued to Ciotti et al on April 30, 1991 ; U. S. Patent No. 4,421,769 issued to Dixon et al on December 20, 1983; and U. S. Patent No. 3,755,560 issued to Dickert et al on August 28, 1973. Suitable emulsifier types include esters of glycerin, esters of propylene glycol, fatty acid esters of polyethylene glycol, fatty acid esters of polypropylene glycol, esters of sorbitol, esters of sorbitan anhydrides, carboxyhc acid copolymers, esters and ethers of glucose, ethoxylated ethers, ethoxylated alcohols, alkyl phosphates, polyoxyethylene fatty ether phosphates, fatty acid amides, acyl lactylates, soaps and mixtures thereof. Suitable emulsifiers mclude, but are not limited to, TEA stearate, DEA oleth-3 phosphate, polyethylene glycol 20 sorbitan monolaurate (polysorbate 20), polyethylene glycol 5 soya sterol, steareth-2, steareth-20, steareth-21 , ceteareth-20, PPG-2 methyl glucose ether distearate, ceteth-10, polysorbate 80, cetyl phosphate, potassium cetyl phosphate, diethanolamine cetyl phosphate, polysorbate 60, glyceryl stearate, PEG- 100 stearate, and mixtures thereof. Prefeπed emulsifiers are steareth-2, steareth-21, TEA stearate, diethanolamine cetyl phosphate, potassium cetyl phosphate, and mixtures thereof. The emulsifier can be used individually or as a mixture of two or more and comprises from about 0.1% to about 10%, more preferably from about 0.15% to about 7%, and most preferably from about 0.25% to about 5% of the compositions of the present invention. Methods For Providing Protection From UV Radiation The compositions of the present invention are suitable for providing protection against the harmful effects of ultraviolet radiation, preferably in personal care products. More preferably, the compositions of the present invention are suitable for use as sunscreens to provide protection to human skin from the harmful effects of UV radiation which include, but are not limited to, sunburn and premature aging of the skin. The present invention therefore also further relates to methods of protecting human skin from the harmful effects of UV radiation. Such methods generally involve attenuating or reducing the amount of UV radiation which reaches the skin's surface. To protect the skin from UV radiation, a safe and effective (photoprotective) amount of the composition is topically applied to the skin. "Topical application" refers to application of the present compositions by spreading, spraying, etc. onto the surface of the skin. The exact amount applied may vary depending on the level of UV protection desired. From about 0.5 mg of composition per cm* of skin to about 25 mg of composition per cπr of skin are typically applied. EXAMPLES The following examples further describe and demonstrate embodiments within the scope of the present invention. The examples are given solely for the purpose of illustration and are not to be construed as limitations on the present invention, as many variations thereof are possible without departing from the spirit and scope of the invention. The following sunscreen products are representative of the present invention. 1 Available as Pemulen TR-1 from B.F. Goodrich Prepare a water phase by combining the water, Carbomer 980 or Carbomer 954, acrylate copolymer, disodium EDTA, methyl paraben, and glycerin in an appropriate vessel with mixing and heating to 75°C. Prepare the oil phase by combining the octyl methoxycinnamate, octyl salicylate, isopropyl myristate, propyl paraben, l-acetonaphthone, 1 -naphthaldehyde, 4-t-butyl-4'-methoxy-dibenzoylmethane, DEA oleth-3-phosphate, stearic acid, cetyl alcohol, and cetyl palmitate in a separate vessel with mixing and heating to 75°C. Next, mix the oil phase into the water phase with shearing to form an emulsion. Cool the emulsion with shearing to 60°C and add the triethanolamine. Slowly stir the emulsion and cool to 30 - 35°C and package as desired.

Claims: WHAT IS CLAIMED IS: 1. A composition suitable for providing protection against the harmful effects of ultraviolet radiation characterized in that said composition comprises: a) an effective amount of a UVA-absorbing dibenzoylmethane sunscreen active; b) an effective amount of a naphthalene derivative having the formula R is in the 1 or 2 position and is independently selected from the group consisting of CHO, COOH, COR' characterized in that R' is a - C 30 straight or branched alkyl or an aryl, and characterized in that said naphthalene derivative has a triplet energy state of from 56 kcal/mol to 59.5 kcal/mol; and c) a suitable carrier. 2. The composition of Claim 1 wherein the UVA-absorbing dibenzoylmethane sunscreen active and the naphthalene derivative are present in a safe amount. 3. The composition of any of the preceding claims wherein the naphthalene derivative is selected from the group consisting of 1 -naphthaldehyde, 2-naphthaldehyde, 2-acetonaphthone, 1-naphthoic acid, 1- acetonaphthone, and mixtures thereof. 4. The composition of any of the preceding claims wherein the naphthalene derivative is 1- acetonaphthone. 5. The composition of any of the preceding claims wherein the UVA-absorbing dibenzoylmethane sunscreen active is selected from the group consisting of 2-methyldibenzoylmethane, 4- methyldibenzoylmethane, 4-isopropyldibenzoylmethane, 4-tert-butyldibenzoylmethane, 2,4- dimethyldibenzoylmethane, 2,5-dimethyldibenzoylmethane, 4,4'-diisopropylbenzoylmethane, 4-tert- butyl-4'-methoxydibenzoylmethane, 2-methyl-5-isopropyl-4'-methoxydibenzoylmethane, 2-methyl-5- tert-butyl-4'-methoxydibenzoylmethane, 2,4-dimethyl-4'-methoxydibenzoylmethane, 2,6-dimethyl- 4'tert-butyl-4'methoxydibenzoylmethane, and mixtures thereof. 6. The composition of any of the preceding claims wherein the UVA-absorbing dibenzoylmethane sunscreen active is 4-tert-butyl-4'-methoxydibenzoylmethane. 7. The composition of any of the preceding claims wherein the composition comprises from 0.01% to 30%, by weight of the composition, of the UVA-absorbing dibenzoylmethane sunscreen active. 8. The composition of any of the preceding claims wherein the mole ratio of the UVA-absorbing dibenzoylmethane sunscreen active to the naphthalene derivative is from 8: 1 to 1 :1. 9. A method for providing protection against the harmful effects of ultraviolet radiation to skin characterized in that said method comprises applying a safe and effective amount of the composition of any of the preceding claims to skin. 10. A method of stabilizing a UVA-absorbing dibenzoylmethane sunscreen active characterized in that said method comprises combining an effective amount of a UVA-absorbing dibenzoylmethane sunscreen active with an effective amount of a na the formula R is in the 1 or 2 position and is independently selected from the group consisting of CHO, COOH, COR characterized in that R' is a Ci - C 30 straight or branched alkyl or an aryl, and characterized in that said naphthalene derivative has a triplet energy state of from 56 kcal/mol to 59.5 kcal/mol.

Inventors: ROBINSON LARRY RICHARD, ROBINSON, LARRY, RICHARD
Applicants: PROCTER & GAMBLE, THE PROCTER & GAMBLE COMPANY
Application year: 1999
Main classification: A61K7
IPC codes: A61K8, A61K31, A61P17, A61Q17