RETINOL CONTAINING COSMETIC COMPOSITION

Abstract: A composition for topical application to human skin in order to promote the repair of photo-damaged skin and/or to reduce or prevent the damaging effects of UV light on skin and/or to lighten the skin comprising retinol or a derivative thereof and a selected skin lightening agent.

Description: RETINOL CONTAINING COSMETIC COMPOSITION FIELD OF INVENTION The invention relates to a composition for topical application to human skin in order to lighten skin colour and to promote the repair of photo-damaged skin and/or to reduce or prevent the damaging effects of ultra-violet light on skin. The invention also relates to the use of such compositions in lightening skin colour, in the repair of photo-damaged skin and in the prevention of damage to skin due to exposure to ultra-violet light. BACKGROUND TO THE INVENTION The treatment of human skin damaged due to exposure to ultra-violet light, ie. photo-damage, has been subject to much research effort in recent years, particularly with the realisation that skin cancer and other skin disorders can arise where the exposure to sunlight is excessive. This problem is even more serious with the depletion of the ozone layer which is believed to permit a higher level of ultra-violet radiation to reach the earth's surface. Chronic exposure to sunlight results in multiple adverse effects on all structural elements of the skin. The clinical manifestation of these changes, collectively known as photoageing is lax, dry inelastic skin that is wrinkled and blotchy with a coarse, roughened texture, uneven colour and altered pigmentation. Skin blotchiness or mottling (hyperpigmentation) is due to changes in the melanocytes or the processing of melanin within the population of epidermal cells. These pigment producing cells, which unlike the keratinocytes remain at the base of the epidermis, lose their normal regulation process with ageing and produce excess pigment. This leads to the formation of dense perinuclear clumps of melanin in slowly turning over keratinocytes within the epidermis, and areas of hyperpigmentation or 'age spots' develop. In the therapy of such hyperpigmented skin, certain skin lightening agents such as kojic acid, hydroquinone or ascorbic acid are effective by inhibiting the formation of melanin. Vitamin A acid (retinoic acid) is beneficial in hyperpigmentation problems by normalising the skin colour. Also by increasing cell turnover, Vitamin A acid prevents accumulation of pigment within the more rapidly dividing and migrating keratinocytes. Vitamin A acid also enhances the pigment reducing potential of conventional skin lightening agents. The topical application of Vitamin A acid does however have a major drawback in that it is a potent skin irritant, and can accordingly damage the skin. Vitamin A acid is also a teratogen. Its recommended use for example as a prescription drug in the treatment of acne involves careful control, such that excessive doses are avoided in order to restrict the side effects which can occur with skin. By the same token, the use of Vitamin A acid for lightening skin and in the treatment or prevention of photo-damaged skin is severely limited by these side effects, and for this reason it is not generally recommended for use in cosmetic products. We have now discovered that retinol or certain derivatives thereof, when combined with a skin lightening agent can be used effectively in the repair of photo-damaged skin or the prevention of photo-damage to skin following exposure to ultra-violet light. This combination is also particularly useful in reducing hyperpigmentation of skin. The invention is accordingly concerned with compositions comprising retinol or certain derivatives thereof together with a skin lightening agent for topical application to human skin, and the use of this combination of active agents to lighten skin and in the treatment of photo- damaged and/or hyperpigmented skin or the prevention thereof, following excessive exposure to ultra-violet light. DEFINITION OF THE INVENTION Accordingly, the invention provides a composition suitable for topical application to human skin in order to lighten skin and promote repair of photo-damaged skin and/or to reduce or prevent the damaging effects of ultra-violet light on skin, which composition comprises: i) an effective amount of from 0.001 to 10% by weight of retinol or a derivative thereof having the structure (1) : where X represents H or COR where R represents a group chosen from branched or unbranched, alkyl or alkenyl groups having an average of from 1 to 20 carbon atoms; and i) an effective amount of from 0.01 to 20% by weight of a skin lightening agent chosen from L-ascorbic acid and derivatives thereof, kojic acid and derivatives thereof, hydroquinone and derivatives thereof, extract of placenta, arbutin, niacin, niacinamide, α hydroxy acids, phloretin, phloridzin, liquorice extract, cysteaminylphenol and derivatives thereof and compounds having the structure (2) : where R 1 represents H, or an ether group represented by OR 3 , R 2 and R 3 are the same or different and each represents a group chosen from branched or unbranched alkyl or alkenyl groups having an average of from 1 to 20 carbon atoms. DISCLOSURE OF THE INVENTION Invention concerns a composition comprising retinol or a derivative thereof together with a skin lightening agent which together behave synergistically in lightening skin and reducing skin blotchiness and mottling due to hyperpigmentation. Furthermore, due to the rejuvenating influence of the retinol or its derivative on skin, there will be an overall improvement in skin texture with reduction in fine wrinkling and improved skin colour. Also, co-formulation with a sunscreen will enhance the photo stability and activity of retinol or its derivative within the formulation and also prevent further actinic damage to the skin. Retinol and derivatives thereof The composition according to the invention comprises retinol or a derivative thereof having the structure (1) . In addition to retinol itself, examples of derivatives of retinol include: Retinyl acetate Retinyl butyrate Retinyl propionate Retinyl octanoate Retinyl laurate Retinyl palmitate Retinyl oleate Retinyl linoleate. The amount of retinol, or a derivative thereof, present in the composition according to the invention is from 0.001 to 10% and preferably 0.01 to 5% by weight of the composition. Preferably the composition comprises retinol, most preferably the composition comprises the trans-isomer of retinol. The skin lightening agent The composition according to the invention also comprises a skin lightening agent. Examples of skin lightening agents include: L-ascorbic acid, and derivatives thereof Kojic acid, and derivatives thereof Hydroquinone and derivatives thereof Extract of placenta Compounds having the structure (2) Arbutin a hydroxy acids phloretin phloridzin, liquorice extract cysteaminylphenol and derivatives thereof Niacin, and Niacinamide. Preferably the skin lightening agent is hydroquinone and derivatives thereof, most preferably hydroquinone. The amount of skin lightening agent which is present in the composition according to the invention is from 0.01 to 20%, preferably 0.1 to 10% by weight of the composition. The Cosmeticallv Acceptable Vehicle The composition according to the invention also comprises a cosmetically acceptable vehicle to act as a dilutant, dispersant or carrier for other materials present in the composition, so as to facilitate their distribution when the composition is applied to the skin. Vehicles other than water can include liquid or solid emollients, solvents, humectants, thickeners and powders. Examples of each of these types of vehicle, which can be used singly or as mixtures of one or more vehicles, are as follows: Emollients, such as stearyl alcohol, glyceryl monoricinoleate, mink oil, cetyl alcohol, isopropyl isostearate, stearic acid, isobutyl palmitate, isocetyl stearate, oleyl alcohol, isopropyl laurate, hexyl laurate, decyl oleate, octadecan-2-ol, isocetyl alcohol, eicosanyl alcohol, behenyl alcohol, cetyl palmitate, silicone oils such as dimethylpolysiloxane, di-n-butyl sebacate, isopropyl myristate, isopropyl palmitate, isopropyl stearate, butyl stearate, polyethylene glycol, triethylene glycol, lanolin, cocoa butter, corn oil, cotton seed oil, olive oil, palm kernel oil, rapeseed oil, safflower seed oil, evening primrose oil, soybean oil, sunflower seed oil, avocado oil, sesame seed oil, coconut oil, arachis oil, castor oil, acetylated lanolin alcohols, petroleum jelly, mineral oil, butyl myristate, isostearic acid, palmitic acid, isopropyl linoleate, lauryl lactate, myristyl lactate, decyl oleate, myristyl myristate; Propellants, such as propane, butane, isobutane, dimethyl ether, carbon dioxide, nitrous oxide; Solvents, such as ethyl alcohol, isopropanol, acetone, ethylene glycol monoethyl ether, diethylene glycol monobutyl ether, diethylene glycol monoethyl ether; Powders, such as chalk, talc, fullers earth, kaolin, starch, gums, colloidal silica sodium polyacrylate, tetra alkyl and/or trialkyl aryl ammonium smectites, chemically modified magnesium aluminium silicate, organically modified montmorillonite clay, hydrated aluminium silicate, fumed silica, carboxyvinyl polymer, sodium carboxymethyl cellulose, ethylene glycol monostearate. The cosmetically acceptable vehicle will usually form from 10 to 99.9%, preferably from 50 to 99% by weight of the emulsion, and can, in the absence of other cosmetic adjuncts, form the balance of the emulsion. Organic sunscreens The composition of the invention optionally can comprise an organic sunscreen further to enhance the benefit of the composition in providing protection from the harmful effects of excessive exposure to sunlight. Examples of suitable organic sunscreens, when required, include those set out in Table 1 below, and mixtures thereof. TABLE 1 CTFA Name Trade Name Supplier Benzophenone-3 UVINUL M-40 BASF Chemical Co. Benzophenone-4 UVINUL MS-40 BASF Chemical Co. Benzophenone-8 SPECRA-SORB UV-24 American Cyanamide DEA Methoxycinnamate BERNEL HYDRO Bernel Chemical Ethyl dihydroxy- propyl-PABA AMERSCREEN P Amerchol Corp. Glyceryl PABA NIPA G.M.P.A. Nipa Labs. Homosalate KEMESTER HMS Hunko Chemical Methyl anthranilate SUNAROME UVA Felton Worldwide Octocrylene UVINUL N-539 BASF Chemical Co. Octyl dimethyl PABA AMERSCOL Amerchol Corp. Octyl methoxy¬ cinnamate PARSOL MCX Bernel Chemical Octyl salicylate SUNAROME WMO Felton Worldwide PABA PABA National Starch 2-Phenyl- benzimidazole- -5-sulphonic acid EUSOLEX 232 EM Industries TEA salicylate SUNAROME W Felton Worldwide 3-(4-methylbenzy- lidene) -camphor EUSOLEX 6300 EM Industries Benzophenone-1 UVINUL 400 BASF Chemical Co. Benzophenone-2 UVINUL D-50 BASF Chemical Co. Benzophenone-6 UVINUL D-49 BASF Chemical Co. Benzophenone-12 UVINUL 408 BASF Chemical Co. 4-Isopropyl dibenzoyl methane EUSOLEX 8020 EM Industries Butyl methoxy di¬ benzoyl methane PARSOL 1789 Givaudan Corp. Etocrylene UVINUL N-35 BASF Chemical Co. The composition of the invention can accordingly comprise from 0.1 to 10%, preferably from 1 to 5% by weight of an organic sunscreen material. Inorganic sunscreen The composition according to the invention optionally can also comprise as a sunscreen ultrafine titanium dioxide in either of two forms, namely water-dispersible titanium dioxide and oil-dispersible titanium dioxide. Water-dispersible titanium dioxide is ultrafine titanium dioxide, the particles of which are uncoated or which are coated with a material to impart a hydrophilic surface property to the particles. Examples of such materials include aluminium oxide and aluminium silicate. Oil-dispersible titanium dioxide is ultrafine titanium dioxide, the particles of which exhibit a hydrophobic surface property, and which, for this purpose, can be coated with metal soaps such as aluminium stearate, aluminium laurate or zinc stearate, or with organosilicone compounds. By "ultrafine titanium dioxide" is meant particles of titanium dioxide having an average particle size of less than lOOnm, preferably from 10 to 40nm and most preferably from 15 to 25nm. By topical application to the skin of a mixture of both water-dispersible ultrafine titanium dioxide and oil- dispersible ultrafine titanium dioxide, synergistically enhanced protection of the skin against the harmful effects of both UV-A and UV-B rays is achievable. It is believed that this unexpected benefit is due to the deposition of each type of titanium dioxide on different regions of the skin surface, water-dispersible titanium dioxide being preferentially retained by hydrophilic regions of the skin's surface, while oil-dispersible titanium dioxide is retained preferentially by hydrophobic regions of the skin's surface. The combined overall effect is that more efficient physical coverage of the skin's surface is attainable and this can be demonstrated by measurement of the Sun Protection Factor (SPF) . In order to achieve the enhanced, synergistic benefit, as herein described, the weight ratio of water-dispersible titanium dioxide to oil-dispersible titanium dioxide should be from 1:4 to 4:1, preferably from 1:2 to 2:1 and ideally about equal weight proportions. The total amount of titanium dioxide that can optionally can be incorporated in the composition according to the invention is from 1 to 25%, preferably from 2 to 10% and ideally from 3 to 7% by weight of the composition. Other Inorganic Sunscreens The emulsion of the invention optionally can comprise an inorganic sunscreen in addition to ultrafine titanium dioxide as herein defined. Examples of other inorganic sunscreens include: zinc oxide, having an average particle size of from 1 to 300nm, iron oxide, having an average particle size of from 1 to 300nm, silica, such as fumed silica, having an average particle size of from 1 to lOOnm. It should be noted that silica, when used as an ingredient in the emulsion according to the invention can provide protection from infra-red radiation. OPTIONAL SKIN BENEFIT MATERIALS AND COSMETIC ADJUNCTS A particularly convenient form of the composition according to the invention is an emulsion, in which case an oil or oily material will normally be present, together with an emulsifier to provide either a water-in-oil emulsion or an oil-in-water emulsion, depending largely on the average hydrophilic-lyophilic balance (HLB) of the emulsifier employed. Oil or oily material The composition according to the invention can optionally comprise one or more oils or other materials having the properties of an oil. Examples of suitable oils include mineral oil and vegetable oils, and oil materials, such as those already proposed herein as emollients. Other oils or oily materials include silicone oils, both volatile and non-volatile, such as polydimethyl siloxanes. The oil or oily material, when present for the purposes for forming an emulsion, will normally form up to 90%, preferably from 10 to 80% by volume of the composition. Emulsifier The composition according to the invention can also optionally comprise one or more emulsifiers the choice of which will normally determine whether a water-in-oil or and oil-in-water emulsion is formed. When a water-in-oil emulsion is required, the chosen emulsifier or emulsifiers should normally have an average HLB value of from 1 to 6. When an oil-in-water emulsion is required, a chosen emulsifier or emulsifiers should have an average HLB value of >6. Examples of suitable emulsifiers are set below in Table 1 in which the chemical name of the emulsifiers is given together with an example of a trade name as commercially available, and the average HLB value. Table 2 Chemical Name Trade Name HLB Value of Emulsifier Sorbitan trioleate Arlacel 85 1.8 Sorbitan tristearate Span 65 2.1 Glycerol monooleate Aldo MD 2.7 Glycerol monostearate At ul 84S 2.8 Glycerol monolaurate Aldo MC 3.3 Sorbitan sesquioleate Arlacel 83 3.7 Sorbitan monooleate Arlacel 80 4.3 Sorbitan monostearate Arlacel 60 4.7 Poloxyethylene (2) stearyl ether Brij 72 4.9 Poloxyethylene sorbitol beeswax derivative PEG 200 dilaurate Sorbitan monopalmitate Polyoxyethylene (3.5) nonyl phenol PEG 200 monostearate Sorbitan monolaurate PEG 400 dioleate Polyoxyethylene (5) monostearate Ethofat 60-16 9.0 Polyoxyethylene (4) sorbitan monostearate Tween 61 9.6 Polyoxyethylene (4) lauryl ether Brij 30 9.7 Polyoxyethylene (5) sorbitan monooleate Tween 81 10.0 PEG 300 monooleate Neutronyx 834 10.4 Polyoxyethylene (20) sorbitan tristearate Tween 65 10.5 Polyoxyethylene (20) sorbitan trioleate Tween 85 11.0 Polyoxyethylene (8) monostearate Myrj 45 11.1 PEG 400 monooleate Emerest 2646 11.7 PEG 400 monostearate Tegester PEG 400 11.9 Polyoxyethylene 10 monooleate Ethofat 0/20 12.2 Polyoxyethylene (10) stearyl ether Brij 76 12.4 Polyoxyethylene (10) cetyl ether Brij 56 12.9 Polyoxyethylene (9.3) octyl phenol Triton X-100 13.0 Polyoxyethylene (4) sorbitan monolaurate PEG 600 monooleate PEG 1000 dilaurate Polyoxyethylene sorbitol lanolin derivative Polyoxyethylene (12) lauryl ether PEG 1500 dioleate Polyoxyethylene (14) laurate Arosurf HFL-714 14.8 Polyoxyethylene (20) sorbitan monostearate Tween 14.9 Polyoxyethylene 20 sorbitan monooleate Tween 80 15.0 Polyoxyethylene (20) stearyl ether Brij 78 15.3 Polyoxyethylene (20) sorbitan monopalmitate Tween 40 15.6 Polyoxyethylene (20) cetyl ether Brij 58 15.7 Polyoxyethylene (25) oxypropylene G-2162 16.0 monostearate Polyoxyethylene (20) sorbitol monolaurate Tween 20 16.7 Polyoxyethylene (23) lauryl ether Brij 35 16.9 Polyoxyethylene (50) monostearate Myrj 53 17.9 PEG 4000 monostearate Pegosperse 4000 MS 18.7 The foregoing list of emulsifiers is not intended to be limiting and merely exemplifies selected emulsifiers which are suitable for use in accordance with the invention. It is to be understood that two or more emulsifiers can be employed if desired. The amount of emulsifier or mixtures thereof, that optionally can be incorporated in the composition of the invention is from 1 to 50%, preferably from 2 to 20% and most preferably from 2 to 10% by weight of the composition. Water The composition of the invention can also comprise water, usually up to 80%, preferably from 5 to 80% by volume. Silicone Surfactant The composition of the invention can also optionally comprise a high molecular weight silicone surfactant which can also act as an emulsifier, in place of or in addition to the optional emulsifier(s) already mentioned. The silicone surfactant is a high molecular weight polymer of dimethyl polysiloxane with polyoxyethylene and/or polyoxypropylene side chains having a molecular weight of from 10,000 to 50,000 and having the structure: where the groups R' and R" are each chosen from -H, C alkyl and " [CH 2 CH 2 0] a [CH 2 CHO] b H CH, a has a value of from 9 to 115, b has a value of from 0 to 50, x has a value of from 133 to 673, y has a value of from 25 to 0.25. Preferably, the dimethyl polysiloxane polymer is one in which: a has a value of from 10 to 114 b has a value of from 0 to 49 x has a value of from 388 to 402 y has a value of from 15 to 0.75 one of groups R 1 and R" being lauryl, and the other having a molcular weight of from 1000 to 5000. A particularly preferred dimethyl polysiloxane polymer is one in which: a has the value 14 b has the value 13 x has the value 249 y has the value 1.25 The dimethyl polysiloxane polymer is conveniently provided as a dispersion in a volatile siloxane, the dispersion comprising, for example, from 1 to 20% by volume of the polymer and from 80 to 99% by volume of the volatile siloxane. Ideally, the dispersion consists of a 10% by volume of the polymer dispersed in the volatile siloxane. Examples of the volatile siloxanes in which the polysiloxane polymer can be dispersed include polydimethyl siloxane (pentamer and/or hexamer) . A particularly preferred silicone surfactant is cyclomethicone and dimethicone copolyol, such as DC 3225C Formulation Aid available from DOW CORNING. Another is laurylmethicone copolyol, such as DC Q2-5200, also available from Dow Corning. The amount of silicone surfactant, when present in the composition will normally be up to 25%, preferably from 0.5 to 15% by weight of the emulsion. Other Cosmetic Adjuncts Examples of conventional adjuncts which can optionally be employed include preservatives, such as para-hydroxy benzoate esters; antioxidants, such butyl hydroxy toluene; humectants, such as glycerol, sorbitol, 2-pyrrolidone-5- carboxylate, dibutylphthalate, gelatin, polyethylene glycol, such as PEG 200-600; buffers, such as lactic acid together with a base such as triethanolamine or sodium hydroxide; waxes, such as beeswax, ozokerite wax, paraffin wax; plant extracts, such as Aloe vera, cornflower, witch hazel, elderflower, cucumber; thickeners; activity enhancers; colourants; and perfumes. Cosmetic adjuncts can form the balance of the composition. Use of the Composition The composition according to the invention is intended primarily as a skin care product for topical application to human skin to lighten skin and/or to repair photo-damaged skin and to prevent photo-damage to skin due to exposure to sunlight. In particular, the composition can be used to reduce skin blotchiness and mottling due to hyperpigmentation, to improve skin texture with reductions in fine wrinkling and otherwise to improve skin colour. In general, the composition, when topically applied to skin, is useful in the prevention of actinic damage to all epidermal cells. In use, a small quantity of the composition, for example from 1 to 5ml, is applied to exposed areas of the skin, from a suitable container or applicator and, if necessary, it is then spread over and/or rubbed into the skin using the hand or fingers or a suitable device. PRODUCT FORM AND PACKAGING The topical skin treatment composition of the invention can be formulated as a lotion having a viscosity of from 4,000 to 10,000 mPas, a fluid cream having a viscosity of from 10,000 to 20,000 mPas or a cream having a viscosity of from 20,000 to 100,000 mPas, or above. The composition can be packaged in a suitable container to suit its viscosity and intended use by the consumer. For example, a lotion or fluid cream can be packaged in a bottle or a roll-ball applicator or a propellant-driven aerosol device or a container fitted with a pump suitable for finger operation. When the composition is a cream, it can simply be stored in a non-deformable bottle or squeeze container, such as a tube or a lidded jar. The invention accordingly also provides a closed container containing a cosmetically acceptable composition as herein defined. Test method - In vitro melanocyte cell culture Pigment producing cells derived from a mammalian melanoma are grown in culture by standard methods. Preferred cell lines are B16 or S-91 cells, but other lines or primary mouse or human melanocytes can be used. Melanoma cells are grown in cell culture medium such as RPMI 1640 (GIBCO) supplemented with fetal calf serum and glutamine to approximately 1/3 confluence. The active is dissolved in culture medium, the pH adjusted as required and sterile filtered. The solution is then added to the cells. The cells are cultured for a further period of 4 days and the amount of melanin produced assayed by measuring the absorbance at 540 nm of the melanin released into the medium. Cell viability is tested using neutral red (3-amino-7- dimethylamino-2-methyl phenazine hydrochloride) a water soluble vital dye which passes through the intact plasma membrane and becomes concentrated in lysosomes of viable cells. For any culture, the amount of dye taken up is proportional to the number of viable cells and agents that damage cell and lysosomal membranes inhibit dye incorporation. The cells are incubated in 50 μg/ l neutral red solution for 3 hours at 37°C in 5% C0 2 in air. The solution is aspirated, the cells washed once in saline and to them added a solvent (50% H 2 0, 49% ethanol, 1% acetic acid) to solubilise the dye. The amount of neutral red dye is quantified by measuring absorbance at 540 nm. Results The above procedure was used to assess the ability of compositions of skin lightening agents (at a range of concentrations) and retinol (at a range of concentrations) to reduce the amount of melanin produced without affecting cell viability. These compositions were compared with compositions having retinol alone at a range of concentrations and skin lightening agents alone at a range of concentrations. The results for both viability and melanin production were calculated as percentages of the control which contained medium alone. Results are given in Table 3 and 4. Results clearly show that the skin lightening agents and retinol act synergistically to reduce melanin production. There were no effects on cell viability at these concentrations. Table 3 percentage is significantly different (P<0.05) from control. Table 4 EXAMPLES The invention is further illustrated by the following examples; in each formulation, the titanium dioxide employed was ultrafine titanium dioxide having a mean particle size of from 15 to 25nm. Example 1 This example illustrates a lotion according to the invention. Ingredient % w/w retinyl propionate 1 kojic acid 1 silicone surfactant 10 volatile siloxane 14 mineral oil 1.5 titanium dioxide (water-dispersible) 2.5 titanium dioxide (oil-dispersible) 2.5 2-hydroxy octanoic acid 1 2-hydroxy propanoic acid 5 butylene glycol 10 sodium chloride 2 1-proline 0.1 neutralising agent qs preservative qs perfume qs water qs Example 2 This example illustrates a fluid cream according to the invention. Ingredient % w/w retinyl acetate 0.3 niacinamide 1 volatile siloxane (DC 345) 8.2 silicone surfactant (DC 3225C) 12 petroleum jelly 0.5 mineral oil 1.5 Parsol MCX (octyl methoxycinnamate) 3 titanium dioxide (oil-dispersible) 2 titanium dioxide (water-dispersible) 2 sodium chloride 2 butylene glycol 10 1-proline 0.1 2-hydroxy octanoic acid 1 2-hydroxy propanoic acid 5 neutralising agent qs preservative qs perfume qs water qs Example 3 This example illustrates a cream according to the invention. Ingredient % w/w retinyl palmitate 1 L-ascorbic acid 2 volatile siloxane (DC 345 Fluid) 8.2 silicone surfactant (DC 3225C) 12 mineral oil 1.5 petroleum jelly 0.5 Parsol MCX (octyl methoxycinnamate) 1.5 titanium dioxide (oil-dispersible) 1.0 titanium dioxide (water-dispersible) 1 2-hydroxyoctanoic acid 1 2-hydroxypropanoic acid 5 sodium chloride 2 butylene glycol 10 1-proline 0.1 neutralising agent (aqueous phase to 4.5) q.s. preservative q.s. perfume q.s. water to 100 Example 4 This example illustrates a lotion according to the invention. Ingredient % w/w retinyl linoleate 0.5 retinyl palmitate 0.5 arbutin 2 silicone surfactant (DC 3225C) 10 volatile siloxane (DC 345) 14 mineral oil 1.5 Parsol MCX 3 titanium dioxide (oil-dispersible) 2 titanium dioxide (water-dispersible) 2 butylene glycol 10 sodium chloride 2 1-proline 0.1 2-hydroxy octanoic acid 1 2-hydroxy propanoic acid 5 neutralising agent qs perfume qs preservative qs water qs Example 5 This example illustrates a sunscreen cream in accordance with the invention. Ingredient % w/w retinyl oleate 2 retinyl acetate 1 hydroquinone 1 Polyoxyethylene (2) stearyl alcohol 3 Polyoxyethylene (21) stearyl alcohol 2 cetyl alcohol 1.5 soft white paraffin 1.5 silicone fluid 200 5 liquid paraffin 8 glycerin 2 preservatives 0.5 titanium dioxide (water-dispersible) 2.5 titanium dioxide (oil-dispersible) 2.5 water to 100 Example 6 This example also illustrates sunscreen cream in accordance with the invention. Ingredients % w/w retinyl acetate 0.2 retinyl laurate 2 niacin 2 cetyl dimethicone copolyol cetyl dimethicone polyglycery1-3-oleate hexyl laurate ) isopropyl myristate 13.5 beeswax 3 silicone fluid 200 5 preservatives 0.5 titanium dioxide (water-dispersible) 2.5 titanium dioxide (oil-dispersible) 2.5 water to 100 *Available is ABIL W508 ex Goldschmidt Example 7 This example illustrates a lotion according to the invention. Ingredient % w/w retinyl octanoate 2 phloretin 2 silicone surfactant 10 volatile siloxane 14 mineral oil 1.5 ultrafine titanium dioxide (water-dispersible) 5 2-hydroxy octanoic acid 1 2-hydroxy propanoic acid 5 butylene glycol 10 sodium chloride 2 amino acid 0.1 neutralising agent qs preservative qs perfume qs water qs Example 8 This example illustrates a lotion according to the invention. Ingredient % w/w retinyl palmitate 2 hydroquinone monomethyl ether 0.5 silicone surfactant 10 volatile siloxane 14 mineral oil 1.5 ultrafine titanium dioxide (oil-dispersible) 5 2-hydroxy octanoic acid 1 2-hydroxy propanoic acid 5 butylene glycol 10 sodium chloride 2 amino acid 0.1 neutralising agent qs preservative qs perfume qs water qs Example 9 This example illustrates a lotion according to the invention. Ingredient % w/w retinyl octanoate 1 retinyl linoleate 1 phloridzin 1 silicone surfactant 10 volatile siloxane 14 mineral oil 1.5 ultrafine titanium dioxide (water-dispersible) 2.5 ultrafine titanium dioxide (oil-dispersible) 2.50 2-hydroxy octanoic acid 1 2-hydroxy propanoic acid 5 butylene glycol 10 sodium chloride 2 amino acid 0.1 neutralising agent qs preservative qs perfume qs water qs Example 10 This example illustrates an anhydrous formulation in accordance with the invention. Ingredient w/w retinol 0.2 4-S-cysteaminylphenol 1 Iso-propyl alcohol 10 volatile silicone 80 ethyl hexyl palmitate 8.7 antioxidant 0.1

Claims: CLAIMS 1. A composition suitable for topical application to human skin in order to promote repair of photo-damaged skin and/or to reduce or prevent the damaging effects of ultra¬ violet light on skin, which composition comprises: i) an effective amount of from 0.001 to 10% by weight of retinol or a derivative thereof having the structure (1): CI SLOX where X represents H or -COR where R represents a group chosen from branched or unbranched, alkyl or alkenyl groups having an average of from 1 to 20 carbon atoms; and i) an effective amount of from 0.01 to 20% by weight of a skin lightening agent chosen from L-ascorbic acid and derivatives thereof, kojic acid and derivatives thereof, hydroquinone and derivatives thereof, extract of placenta, arbutin, niacin, niacinamide, hydroxy acids, phloretin, phloridzin, liquorice extract, cysteaminylphenol and derivatives thereof and compounds having the structure (2) : *' where R 1 represents H, or an ether group represented by OR 3 , R 2 and R 3 are the same or different and each represents a group chosen from branched or unbranched alkyl or alkenyl groups having an average of from 1 to 20 carbon atoms. 2. A composition according to claim 1 wherein the amount of retinol or a derivative thereof having the structure (1) is from 0.01 to 5% by weight of the composition. 3. A composition according to claim 1 or 2 wherein the amount the skin lightening agent is from 0.1 to 10% by weight of the composition. 4. A composition according to any preceding claim wherein the skin lightening agent is hydroquinone or a derivative thereof. 5. A composition according to any preceding claim wherein the skin lightening agent is hydroquinone. 6. A composition according to any preceding claim wherein the composition comprises trans-retinol. 7. Use of a composition according to any preceding claim in the repair of photo-damaged skin and/or in the prevention of damage to the skin due to exposure to ultraviolet light. 8. A method of reducing or preventing the damaging effects of UV light on skin and/or of lightening the skin, which method includes the topical application of a composition comprising: i) an effective amount of from 0.001 to 10% by weight of retinol or a derivative thereof having the structure (1) : where X represents H or -COR where R represents a group chosen from branched or unbranched, alkyl or alkenyl groups having an average of from 1 to 20 carbon atoms; and ii) an effective amount of from 0.01 to 20% by weight of a skin lightening agent chosen from L-ascorbic acid and derivatives thereof, kojic acid and derivatives thereof, hydroquinone and derivatives thereof, extract of placenta, arbutin, niacin, niacinamide, α hydroxy acids, phloretin, phloridzin, liquorice extract, cysteaminylphenol and derivatives thereof, and compounds having the structure (2) : (Z ' HO where R 1 represents H, or an ether group represented by OR 3 , R 2 and R 3 are the same or different and each represents a group chosen from branched or unbranched alkyl or alkenyl groups having an average of from 1 to 20 carbon atoms.

Inventors: HARDING CLIVE RODERICK, LEE CAROLINE MARIAN, SCOTT IAN RICHARD, HARDING, CLIVE, RODERICK, LEE, CAROLINE, MARIAN, SCOTT, IAN, RICHARD
Applicants: UNILEVER NV, UNILEVER PLC
Application year: 1993
Main classification: A61K7
IPC codes: A61K8, A61Q17, A61Q19