Method of providing high SPF to topical surface of body

Abstract

The present invention relates to a method of delivering high sun protection factor (SPF) and UVA protection factor (UVAPF) to a topical surface of a human body. The method offers the synergistic benefit of SPF and UVA PF, which is superior and higher than the effect achieved by each of the two separate steps performed in sequence (i.e., first performing a wash step and then applying a wash-free composition to the same skin surface). The method comprises cleansing the skin with a foam composition produced by a container comprising a pump, the foam composition comprising a water-soluble sunscreen, and then applying a no-wash composition, which may comprise any sunscreen.

Description

Technical Field

[0001] The present invention relates to a method for delivering a high sun protection factor (SPF) to the topical surface of the body, preferably the human body. The method more preferably provides a synergistic benefit of SPF that is superior to and higher than the effect of each delivery of two independent steps performed in sequence, namely, cleaning the skin with a specific cleansing foam composition delivered from a container having a pump, and subsequently applying a sunscreen composition to the same skin surface. Background Art

[0002] Solar radiation includes approximately 5% ultraviolet (UV) radiation with wavelengths between 200 nm and 400 nm. It is further classified into three regions: 320 to 400 nm (UV-A), 290 to 320 nm (UV-B), and 200 to 290 nm (UV-C). It is known that exposure to UV-A and UV-B radiation for a short period of time causes skin redness and local irritation. Prolonged and extended exposure can lead to sunburn, melanoma, and the formation of wrinkles. It has also been reported that UV radiation causes significant damage to hair. Therefore, people desire to protect their skin and hair from the harmful effects of UV-A and UV-B radiation.

[0003] Various cosmetic preparations that can be applied to the skin, such as creams, lotions, or gels, have been reported for preventing and / or protecting the skin from the harmful effects of ultraviolet radiation. These cosmetic compositions typically include different types of organic sunscreens, particularly organic sunscreens capable of absorbing UV-A and / or UV-B radiation present in solar rays. Therefore, both UV-A and UV-B sunscreens are typically incorporated into photoprotective compositions to provide protection across the entire range of UV radiation. Such leave-on compositions are applied to the skin before a person goes outside and they remain on the skin until the person undergoes the next cleansing.

[0004] An alternative method of applying a sunscreen to the skin is through wash-off products such as soaps, facial washes, or bath products, where the sunscreen is incorporated into the skin cleansing product and delivered to the skin during the cleansing process. However, when the main purpose of a wash-off product is to remove dirt and oil from the skin surface, delivering a sunscreen to the skin is an extremely difficult challenge, and the active substances in the wash-off product are also highly likely to be washed away. Therefore, enhanced deposition of active substances through wash-off products is an ongoing challenge.

[0005] The inventors of the present invention have many years of experience in understanding the nature of available sunscreens; knowledge of the interfacial science of surfactant systems and through extensive experimentation have proposed solutions to the problem of delivering high SPF to the skin. They employ a unique two-step method which provides a synergistic improvement in SPF compared to each individual step. The method includes the step of cleansing the skin with a foam composition comprising a water-soluble sunscreen, the foam composition being generated from a container equipped with a foam-generating pump; followed by the step of applying a leave-on sunscreen composition to the skin.

[0006] EP 1 261 688 (Unilever, 2001) discloses a personal cleansing composition which deposits a high level of sunscreen (SPF > 2) while maintaining good foam (i.e., minimal foam degradation over time compared to compositions with more "oily" sunscreens). Enhanced deposition is found from both bar and liquid compositions and is based on the solubility or insolubility of the sunscreen used. SUMMARY OF THE INVENTION

[0007] The inventors of the present invention have found that there are limitations to the SPF achievable with either wash-off sunscreen compositions or leave-on sunscreen compositions, the latter being more effective. Incorporating higher amounts of sunscreen as taught in the prior art generally does not provide a continuous increase in deposition efficacy + and thus does not achieve the SPF.

[0008] Accordingly, one object of the present invention is to eliminate at least some of the disadvantages of the prior art and to provide a method which provides enhanced and even synergistic SPF compared to the known art.

[0009] Another object of the present invention is to provide a method which provides an SPF greater than 10 and a UVAPF (UV-A protection factor) greater than 4.

[0010] According to a first aspect of the present invention, there is provided a method of providing a high SPF to a local surface of the body, the method comprising the steps of:

[0011] (a) cleansing the surface with a wash-off composition generated in foam form from a container comprising a pump, the wash-off composition comprising:

[0012] (i) 0.1 to 10% by weight of a water-soluble UVA sunscreen;

[0013] (ii) 0.1 to 10% by weight of a water-soluble UVB sunscreen;

[0014] (iii) 3 to 80% by weight, preferably 6 to 80% by weight, of a mild surfactant selected from one or more of anionic surfactants, zwitterionic surfactants and non-ionic surfactants; and

[0015] (iv) A cosmetically acceptable carrier;

[0016] Preferably diluted with water, and then

[0017] (b) Rinse the surface with water; then

[0018] (c) Apply a leave - on composition comprising a sunscreen and a cosmetically acceptable vehicle to the surface.

[0019] A second aspect of the present invention relates to a kit comprising:

[0020] (a) A hand - held container comprising a pump capable of generating foam, the container containing a wash - off composition, the wash - off composition containing 0.1 to 10% by weight of a water - soluble UVA sunscreen; 0.1 to 10% by weight of a water - soluble UVB sunscreen; 3 to 80% by weight, preferably 6 to 80% by weight, of one or more mild surfactants selected from anionic surfactants, zwitterionic surfactants or non - ionic surfactants; and a cosmetically acceptable carrier;

[0021] (b) A leave - on composition comprising a sunscreen and a cosmetically acceptable vehicle; and

[0022] (c) Instructions for use. Detailed Description

[0023] By reading the following detailed description and the appended claims, these and other aspects, features and advantages will become apparent to those of ordinary skill in the art. For the avoidance of doubt, any feature of one aspect of the present invention can be used in any other aspect of the present invention. The word "comprising" is intended to mean "including", but not necessarily "consisting of" or "constituted by". In other words, the listed steps or options need not be exhaustive. It should be noted that the examples given in the following description are intended to illustrate the present invention and not to limit the present invention to these examples themselves. Similarly, unless otherwise specified, all percentages are weight / weight percentages. Except in the operating examples and comparative examples, or where otherwise explicitly indicated, all numbers in this specification and the claims representing amounts of materials or reaction conditions, physical properties of materials and / or uses should be understood to be modified by the word "about". A numerical range expressed in the form "from x to y" should be understood to include x and y. When multiple preferred ranges for a particular feature are described in the format "from x to y", it should be understood that all ranges combining different endpoints are also contemplated.

[0024] The disclosure of the invention found herein is considered to cover all embodiments found in the claims, since they are mutually multiply dependent, regardless of the fact that the claims may be found without multiple dependence or redundancy. In cases where features are disclosed with respect to a particular aspect of the invention (e.g., the method of the invention), such disclosure is also considered applicable, mutatis mutandis, to any other aspect of the invention (e.g., the kit of the invention). Preferably, the method or use is non-therapeutic or cosmetic in nature.

[0025] As used herein, a "rinse-off composition" refers to a composition for cleansing the topical surface of a mammal, particularly a human. Such a composition is particularly suitable for the sun-exposed parts of the body. Such compositions are typically rinse-off, meaning that the composition contains a large amount of surfactant, which is known to assist in cleansing the surface, making it free of oil and dirt. Rinse-off compositions are typically used by diluting the composition with water when applied to the skin, scalp or hair, and then the consumer works up a lather to ensure that the dirt and oil on the surface dissolve in the micelles of the surfactant solution, and then the body is rinsed with a large amount of water to ensure that the surface is substantially free of the composition. The rinse-off composition of the present invention is contained in a container equipped with a pump. When the pump on the container is activated, the composition flows out of the container in the form of a foam, and then the consumer uses the foam to clean the desired surface of the body. As used herein, "skin" is meant to include the skin on the face and body (e.g., neck, chest, back, arms, forearms, hands, legs, buttocks and scalp), and particularly the parts thereof exposed to the sun. The rinse-off composition of the present invention is also related to any other keratinous substrates other than the skin applied to the human body, such as the scalp and hair, where products can be formulated for the specific purpose of providing photoprotection. It has been observed that by using the rinse-off composition of the method of the present invention, dirt and oil on the skin surface are substantially removed during the washing and rinsing process. Additionally, surprisingly, the specific combination of incorporated sunscreen agents ensures that they are deposited in much higher amounts than typically expected from a rinse-off product, in such a way that the deposited sunscreen agents interact synergistically with the sunscreen agents subsequently applied from a leave-on composition to provide enhanced SPF and UVAPF benefits. The enhanced deposition results in the delivery of a high sun protection factor (SPF). A high SPF according to the present invention means a composition preferably having an SPF of at least 10, more preferably at least 15, more preferably higher than 20, further more preferably higher than 30, still more preferably higher than 50, in many cases higher than 80, and in the best case higher than 100. Most preferably, the present invention provides an SPF in the range of 20 to 50. The SPF can be as high as 160. The transmission measurement technique is used to measure the SPF in the present invention. The method of the present invention also provides a high UVAPF. A high UVAPF means that the method delivers at least 4, preferably higher than 8, further preferably higher than 12, further more preferably higher than 16, and most preferably higher than 20 UVAPF (初始) . In a particularly preferred aspect, the present invention provides a UVAPF value in the range of 4 to 16. The UVAPF can be as high as 40.

[0026] The wash-off composition used in the first step of the method of the present invention comprises from 0.1 to 10% by weight of a water-soluble UVA sunscreen; from 0.1 to 10% by weight of a water-soluble UVB sunscreen; from 3 to 80% by weight, preferably from 6 to 80% by weight, of a mild surfactant selected from one or more of anionic surfactants, zwitterionic surfactants and nonionic surfactants; and a cosmetically acceptable carrier.

[0027] Water-soluble sunscreens, whether of the UVA or UVB type, are those having a solubility in water at 25 °C higher than 10 g / l, preferably higher than 50 g / l. The wash-off composition is contained in a container. The container is preferably hand-held. The container comprises a pump at its head such that when the pump is activated by pressing down with a finger or thumb, the composition is mixed with air and exits the container as a foam. The various ways in which a container with a pump can be dispensed are described below.

[0028] The container comprises a sprayable foamable composition. It can be dispensed using a spray device containing the foamable composition. The spray device can comprise a bottle having a nozzle and a spray pump dispenser. Accordingly, the present invention provides a cleansing system comprising a spray device. The spray device comprises a container containing the foamable wash-off composition, a spray head, and a liquid supply device for transferring the foamable wash-off composition from the container to the spray head to form a foam. When dispensed through the spray head from the spray device, the foam produced generally has a density of less than 0.4 g / ml.

[0029] The spray device used in the present invention preferably comprises a container having an internal volume of from 25 to 1000 ml, more preferably from 50 to 800 ml, even more preferably from 60 to 750 ml, most preferably from 75 to 500 ml. The spray device preferably comprises a positive displacement pump acting directly on the foamable wash-off composition. The pump sucks the composition upwards into the liquid supply device and transfers the composition to the spray head, from which the composition is discharged as a foam, preferably through the nozzle.

[0030] In the spray device, the dispensing of the rinse-off composition is preferably powered by the effort of the user, i.e., the liquid cleaning composition is not dispensed under pressure by simply actuating a valve and requires manual triggering. The spray device used according to the invention is preferably selected from trigger spray foam bottles, squeeze foam bottles and foam pumps. Most preferably, the spray device is a squeeze foam bottle or a foam pump. In another preferred embodiment, the spray device is configured to mix the liquid cleaning composition with air before dispensing it from the spray head. The composition can be placed in a reservoir of a plastic squeeze bottle containing a foaming spray head or other foam generating device. Squeezing the container causes the rinse-off composition to leave the reservoir and enter an air mixing or foaming chamber via an internal suction tube. The foam generated in the foaming chamber is typically passed through a homogenizing element inserted between the air mixing chamber and the discharge orifice to homogenize and control the consistency of the discharged foam. Further compression of the foam mass discharges the foam mass as a uniform non-pressurized aerated foam from the discharge cap. Alternatively, the side walls of the container can be rigid and the suction tube can be fitted with a pump actuated by a button. When the composition is suctioned into the air mixing or foaming chamber by the pump, the desired foam is generated.

[0031] Preferred UVB sunscreens for the rinse-off composition are phenylbenzimidazole sulfonic acid (PBSA) or benzylidene camphor sulfonic acid, preferably PBSA.

[0032] PBSA has the following chemical structure:

[0033]

[0034] PBSA, also known as Ensulizole, is commercially available as Eusolex 232 (from Merck KGaA). PBSA is also available under the trade names Neo Heliopan Hydro (from Symrise), Parsol HS (from DSM) and Sunsafe ES (from Uniproma). It is typically used in a neutralized water-soluble form to deliver the desired benefits.

[0035] Benzylidene camphor sulfonic acid has the following chemical structure: It is typically used in a water-soluble form before / after neutralization to provide the desired benefits.

[0036]

[0037] Preferred UVA sunscreens for the rinse-off composition are one or more of disodium phenyl dibenzimidazole tetrasulfonate (Neoheliopan AP) or terephthalylidene dicamphor sulfonic acid (TDSA).

[0038] Disodium phenyl dibenzimidazole tetrasulfonate, also known as bisdisulizole disodium, has the chemical structure given below:

[0039]

[0040] It is commercially available as Neo heliopan AP (from Symrise Shanghai Ltd) or as Sunsafe DPDT (from Uniproma). It is typically used in a neutralized, water - solubilized form to deliver the desired benefits.

[0041] Terephthalylidene dicamphor sulfonic acid (TDSA) has the following structure:

[0042]

[0043] It is also known as Ecamsule. This is commercially available as Mexoryl SX (US 4,585,597) from L'Oreal or as Sunsafe TDSA (from Uniproma). It can be used as the parent acid or its salt in water - soluble form to provide the desired beneficial effects.

[0044] The rinse - off composition preferably comprises from 0.1 to 10% by weight, more preferably from 0.25 to 8% by weight, and even more preferably from 0.5 to 5% of a water - soluble UVA sunscreen. The composition preferably comprises from 0.1 to 10% by weight, more preferably from 0.25 to 8% by weight, and even more preferably from 0.5 to 5% of a water - soluble UVB sunscreen. There are certain sunscreens that have both UVA - screening and UVB - screening efficacy. Such sunscreens provide UVA and UVB protection, such as benzophenone - 4. Benzophenone - 4 (sulisobenzone) has the following chemical structure:

[0045]

[0046] Such sunscreens can also be included in the rinse - off composition of the present invention. When included, it should be understood that it is considered to include one type of sunscreen, either a UVA sunscreen or a UVB sunscreen, but not both. Thus, when included as a UVA sunscreen, it is important to include another sunscreen as a UVB sunscreen. Similarly, when included as a UVB sunscreen, it is important to include another sunscreen as a UVA sunscreen.

[0047] The water - soluble sunscreens included in the rinse - off composition of the present invention are generally commercially available in acid form. When in acid form (pre - / partially neutralized form), i.e., having a sulfonic acid group (–SO 3H) When included in the composition, the rinse-off composition further comprises a neutralizing agent to convert the acid form into a salt form in which, apart from Mexoryl SX, it is known to be active as a sunscreen agent, and Mexoryl SX can be used as a sunscreen agent with or without neutralization. When a neutralizing agent is included, the neutralizing agent preferably accounts for 0.05 to 4% by weight of the composition. The neutralizing agent is preferably an inorganic or organic base. The organic base is preferably an amine such as triethanolamine or diethanolamine. The inventors of the present invention have observed that inorganic bases are particularly preferred. Preferred are alkali metal hydroxides. The most preferred metal hydroxides included as neutralizing agents in the compositions of the present invention are sodium hydroxide or potassium hydroxide.

[0048] One aim of the first step of the method of the present invention is to ensure that the sunscreen agent is deposited on the skin in as high an amount as possible during the rinsing-off process. Without wishing to be bound by theory, the inventors of the present invention believe that this is achieved by selecting a combination of sunscreen agents, the combination being selected based on the structure of the sunscreen agents and their solubility in the selected foaming surfactant composition, which determines the partitioning of the sunscreen agents between the rinse water and the cleaning surface, thereby resulting in a high deposition of the sunscreen agent.

[0049] The rinse-off composition of the present invention comprises a mild surfactant which is delivered in the form of a foam which aids the cleaning action. In order to be able to clean, the mild surfactant comprised is 3 to 80% by weight of the composition, preferably 6 to 80%, more preferably still 10 to 75%. A mild surfactant is one having a zein number of less than 100 or a value of less than 6% zein dissolution weight percentage. The zein dissolution weight percentage is defined in the reference US 9,655,866B2 “Mild Antibacterial Cleaning Composition”.

[0050] The mild surfactant is preferably an anionic surfactant selected from one or more of hydroxyethyl sulfonates, glycinate salts, cocoates, olefin sulfonates, sulfacetates and sulfosuccinate surfactants. Preferred mild anionic surfactants are selected from one or more of sodium cocoyl isethionate, potassium cocoyl glycinate and potassium cocoate, α-olefin sulfonate (AOS), sodium lauryl sulfacetate, alkyl ether sulfacetates, sodium dioctyl sulfosuccinate and alkyl ether sulfosuccinates. The amount of these anionic surfactants present is preferably 1 to 50% by weight of the rinse-off composition, preferably 2 to 35%, more preferably still 10 to 35%.

[0051] The wash-off composition of the present invention preferably comprises a mild amphoteric surfactant, which may be selected from one or more of cocoamidopropyl hydroxysultaine, cocoamidopropyl betaine, sodium lauroamphoacetate and sodium cocoamphoacetate.

[0052] When included, the wash-off composition comprises 0.1 to 10% by weight, preferably 0.5 to 8% by weight, more preferably 1 to 5% by weight of the mild amphoteric surfactant.

[0053] The wash-off composition of the present invention preferably comprises a mild nonionic surfactant, which may be selected from one or more of polysorbate 20, polysorbate 60, sorbitan laurate, decyl glucoside and lauryl glucoside.

[0054] When included, the wash-off composition comprises more than 0.5% by weight but less than 30% by weight, preferably 1 to 20% by weight of the mild nonionic surfactant.

[0055] The wash-off composition of the present invention comprises a cosmetically acceptable carrier. The cosmetically acceptable carrier is preferably an aqueous solution / dispersion of cosmetically acceptable adjuvants. Water is usually included in the wash-off composition of the present invention. The wash-off composition is usually formulated in the form of a liquid, emulsion or gel, wherein the water content is usually 50 to 95% by weight of the composition, preferably 60 to 85%.

[0056] Additional adjuvants for the cosmetically acceptable carrier that can be used to form the wash-off composition are described below.

[0057] The wash-off composition preferably comprises a polyol (also known as a polyhydric alcohol) or a mixture of polyols. Polyol is a term used herein to denote a compound having multiple hydroxyl groups (at least two, preferably at least three), which is highly water-soluble. Many types of polyols are available, including: relatively low molecular weight short-chain polyhydroxy compounds such as glycerol and propylene glycol; sugars such as sorbitol, mannitol, sucrose and glucose; modified carbohydrates such as hydrolyzed starch, dextrin and maltodextrin, and polymeric synthetic polyols such as polyalkylene glycols such as polyethylene glycol (PEG) and polypropylene glycol (PPG). Particularly preferred polyols are glycerol, sorbitol and mixtures thereof. The most preferred polyol is glycerol. In a preferred embodiment, the soap bar of the present invention comprises 0 to 8% by weight, preferably 1 to 7.5% by weight of the polyol.

[0058] A preferred rinse-off composition may additionally comprise up to 30% by weight of a benefit agent. Preferred benefit agents include humectants, emollients, and anti-aging compounds.

[0059] Other optional ingredients such as antioxidants, fragrances, polymers, chelating agents, colorants, deodorants, dyes, enzymes, foam boosters, fungicides, antimicrobials, foaming agents, pearlescents, skin conditioners, stabilizers, or superfatting agents may be added to the process of the present invention in suitable amounts. Preferably, the ingredients are added after the saponification step. Preferably, sodium metabisulfite, ethylenediaminetetraacetic acid (EDTA), borax, or etidronic acid (EHDP) is added to the formulation.

[0060] The present invention includes a second step of the method, which includes applying a leave-on composition comprising a sunscreen and a cosmetically acceptable vehicle to a desired topical surface such as the skin surface. A "leave-on composition" refers to a composition that is applied to a desired topical surface and remains thereon until the surface is typically cleaned after several hours or after one day, at which time a person typically has his bath or shower or any other personal cleansing procedure. The leave-on composition of the present invention may be in the form of a liquid, lotion, cream, spray, stick, or gel. As used herein, "skin" is meant to include the skin on the face and body (e.g., neck, chest, back, arms, forearms, hands, legs, buttocks, and scalp), and especially the parts thereof that are exposed to the sun. The leave-on composition of the present invention is also suitable for any other human keratinous substrate other than the skin, such as the scalp and hair, where products may be formulated with the specific purpose of providing photoprotection.

[0061] The sunscreen in the leave-on composition is an organic UVA sunscreen, an organic UVB sunscreen, an inorganic sunblock, or a mixture thereof, preferably a combination of an organic UVB sunscreen and an organic UVA sunscreen.

[0062] Preferably, the leave-on composition comprises an organic UVA sunscreen that absorbs UVA radiation and prevents it from reaching a surface such as the skin of the user. Examples of sunscreens that may be used as organic UVA sunscreens in the composition are dibenzoylmethane compounds, disodium bisdisulizole (commercially available as Neo AP), and diethylamino hydroxybenzoyl hexyl benzoate (as A Plus (commercially available as), Ecamsule (commercially available as Mexoryl SX), dimethoxyphenyl–[1–(3,4)]–4,4–dimethyl–1,3–pentanedione, and methyl anthranilate. Preferably, the sunscreen agent that can be used as the UVA organic sunscreen agent in the said wash-free composition is selected from dibenzoylmethane compounds or diethylamino hydroxybenzoyl benzoic acid hexyl ester, preferably a dibenzoylmethane compound. Examples of the dibenzoylmethane compound sunscreen agent that can be used as the UVA organic sunscreen agent in the said wash-free composition include butyl methoxydibenzoylmethane or BMDM (commercially available as 1789 or Avobenzone), 2–methyldibenzoylmethane, 4–isopropyldibenzoylmethane, 4–tert-butyldibenzoylmethane, 2,4–dimethyldibenzoylmethane, 2,5–dimethyldibenzoylmethane, 4,4'–diisopropyldibenzoylmethane, 2–methyl–5–isopropyl–4'–methoxydibenzoylmethane, 2–methyl–5–tert-butyl–4'–methoxydibenzoylmethane, 2,4–dimethyl–4'–methoxydibenzoylmethane, or 2,6–dimethyl–4–tert-butyl–4'–methoxydibenzoylmethane. Most preferably, the dibenzoylmethane compound that can be used as the UVA organic sunscreen agent is BMDM.

[0063] Preferably, the said wash-free composition contains 0.01 to 10% by weight, more preferably 0.1 to 8% by weight, even more preferably 1 to 6% by weight, further more preferably 1 to 5% by weight, still more preferably 1 to 3% by weight, and still more preferably 1 to 2.5% by weight of one or more UVA organic sunscreen agents.

[0064] Preferably, the said wash-free composition may include a UV-B organic sunscreen agent. The UVB organic sunscreen agent absorbs UVB radiation and prevents them from reaching the surface, such as the skin of the user. Examples of the UVB organic sunscreen agent that can be used in the composition include compounds selected from the following categories: cinnamic acid, salicylic acid, diphenylacrylic acid, benzylidene camphor, and their derivatives. Examples of such compounds include 2-ethylhexyl salicylate (commercially available as Octisalate TM ), 3,3,5–trimethylcyclohexyl 2–hydroxybenzoate (commercially available as Homosalate TM ), ethylhexyl methoxycinnamate (commercially available as AV), 2–ethylhexyl 2–cyano–3,3–diphenylacrylate (OCR; commercially available as Octocrylene TM ), 2–hydroxy–4–methoxybenzophenone (commercially available as Oxybenzone TMCommercially obtained), 2-ethylhexyl 4-methoxycinnamate (MCX; sold as Parsol MCX TM Commercially obtained), 3-benzylidenecamphor, benzylidenecamphorsulfonic acid, DEA methoxycinnamate, cinoxate, diethylhexylbutamidotriazone, digalloyl trioleate, diisopropylmethylcinnamate, ethyl dihydroxypropyl PABA, ethylhexyl dimethoxymethylenebisoxazolinyl propionate, ethylhexyl dimethyl PABA, ethylhexyl triazone, ferulic acid, glycerol ethylhexanoate dimethoxycinnamate, glycerol PABA, isoamyl p-methoxycinnamate, isoamyl trimethoxycinnamate trisiloxane, isopropylbenzyl salicylate, isopropyl methoxycinnamate, 4-methylbenzylidenecamphor, PABA, PEG-25 PABA, pentyl dimethyl PABA, phenylbenzimidazolesulfonic acid, polyacrylamidomethylenebisbenzylidenecamphor, polysiloxane-15, salicylic acid, TEA salicylate, and mixtures thereof. Preferably, the UVB organic sunscreen agents useful in the wash-free composition are selected from OCR, MCX, phenylbenzimidazolesulfonic acid, ethylhexyl salicylate, and mixtures thereof.

[0065] When incorporated into the composition, the UVB organic sunscreen agent can preferably be incorporated into the wash-free composition at 0.1 to 10% by weight, more preferably 0.5 to 7% by weight, even more preferably 1 to 5% by weight, further more preferably 1 to 3.5% by weight, still more preferably 1 to 3% by weight, still more preferably 1 to 2.5% by weight.

[0066] Preferably, the wash-free composition can include a UVB / A sunscreen agent, which is a sunscreen agent that absorbs UVB and UVA radiation and prevents them from reaching the applied surface. Examples of UVB / A sunscreen agents useful in the composition include benzophenone derivatives. Examples of such compounds include: benzophenone-1, benzophenone-2, benzophenone-3, benzophenone-4, benzophenone-5, benzophenone-6, benzophenone-8, benzophenone-9, β-2-glucopyranosyloxypropyl hydroxybenzophenone, bis-ethylhexyloxyphenol methoxyphenyl triazine (Tinosorb S), drometrizole, drometrizole trisiloxane, methylene bis-benzotriazolyl tetramethylbutylphenol (Tinosorb M).

[0067] Preferably, the wash-free composition contains 0.01 to 10% by weight, more preferably 0.1 to 8% by weight, even more preferably 1 to 6% by weight, further more preferably 1 to 5% by weight, still more preferably 1 to 3% by weight, still more preferably 1 to 2.5% by weight of one or more UVB / A organic sunscreen agents.

[0068] Preferably, the composition may comprise an inorganic sunscreen. Examples of inorganic sunscreens that can be used in the composition include zinc oxide (ZnO), iron oxide, silica (such as pyrogenic silica), and titanium dioxide (TiO 2 ). Preferably, the inorganic sunscreens that can be used in the composition are selected from TiO 2 , ZnO, and mixtures thereof.

[0069] When incorporated into the composition, the inorganic sunscreen may preferably be incorporated into the composition at 0.1 to 25% by weight, more preferably 0.5 to 20% by weight, even more preferably 1 to 15% by weight, further more preferably 1 to 10% by weight, still more preferably 1 to 5% by weight, and still more preferably 1 to 3% by weight.

[0070] The leave-on composition may comprise one or more agents for imparting luster to the skin. Examples of such agents include: niacinamide, picolinamide, 4-alkylresorcinols, vitamin B6, vitamin C, vitamin A, glutathione precursors, galardin, adapalene, aloe extract, ammonium lactate, arbutin, azelaic acid, butylated hydroxyanisole, butylated hydroxytoluene, citrate esters, deoxyarbutin, 1,3-diphenylpropane derivatives, 2,5-dihydroxybenzoic acid and its derivatives, 2-(4-acetoxyphenyl)-1,3-dithiane, 2-(4-hydroxyphenyl)-1,3-dithiane, ellagic acid, glucopyranosyl-1-ascorbate, gluconic acid, glycolic acid, green tea extract, 4-hydroxy-5-methyl-3[2H]-furanone, 4-hydroxyanisole and its derivatives, 4-hydroxybenzoic acid derivatives, hydroxyoctanoic acid, inositol ascorbate, lactic acid, lemon extract, linoleic acid, magnesium ascorbyl phosphate, 5-octanoylsalicylic acid, salicylic acid, 3,4,5-trihydroxybenzyl derivatives, N-acetylglucosamine, yeast extract, symwhite, calcium pantothenate (Melano-block), sepiwhite, soybean extract (Bowman-Birk inhibitor), 12-hydroxystearic acid, and mixtures thereof. When used in the composition, 12-hydroxystearic acid acts as a skin brightener rather than a fatty acid.

[0071] Preferably, the reagent for providing luster to the skin is selected from nicotinamide, picolinamide, isonicotinamide, 12-hydroxy stearic acid, 4-alkylresorcinol, and mixtures thereof. Preferably, the skin brightening agent for the rinse-free composition is nicotinamide. More preferably, the selected skin brightening agent is 4-alkylresorcinol, which is selected from 4-ethylresorcinol (4-ER), 4-isopropylresorcinol (4-IPR), 4-butylresorcinol (4-BR), 4-pentylresorcinol (4-PR), 4-phenylethylresorcinol (4-PER), 4-HR, and mixtures thereof. Even more preferably, the reagent is selected from 4-ER, 4-HR, and mixtures thereof. Further more preferably, the selected reagent is 4-HR.

[0072] Preferably, the rinse-free composition comprises 0.001 to 10% by weight, more preferably 0.01 to 8% by weight, even more preferably 0.1 to 7% by weight, still more preferably 0.1 to 5% by weight, still more preferably 0.1 to 3% by weight, still more preferably 0.1 to 1% by weight, and still more preferably 0.25 to 0.5% by weight of the skin brightening agent.

[0073] The rinse-free composition comprises a cosmetically acceptable vehicle. The cosmetically acceptable vehicle is preferably in the form of an oil, liquid, stick, cream, lotion, spray, or gel. The cosmetically acceptable vehicle preferably comprises ingredients such as surfactants, for example nonionic surfactants, fatty acids, soaps, water, polymers, emollients, solvents, powders, preservatives, or optional ingredients. Details of the various possible ingredients included in the cosmetically acceptable vehicle are given below.

[0074] Preferably, the rinse-free composition comprises a nonionic surfactant. More preferably, the nonionic surfactant is selected from those having an HLB value in the range of 9 to 20, preferably 10 to 19, more preferably 12 to 18, even more preferably 13 to 17, and still more preferably 15 to 17.

[0075] The HLB is calculated using the Griffin method, where HLB = 20 × Mh / M, where Mh is the molecular weight of the hydrophilic part of the molecule and M is the molecular weight of the whole molecule, giving a result on an arbitrary scale from 0 to 20. Typical values for various surfactants are given below:

[0076] Value < 10: Lipophilic (insoluble in water)

[0077] Value > 10: Water-soluble

[0078] Values from 4 to 8 indicate antifoaming agents

[0079] Values from 7 to 11 indicate W / O (water-in-oil) emulsifiers

[0080] Values from 12 to 16 represent an oil-in-water emulsifier

[0081] Values from 11 to 14 represent a wetting agent

[0082] Values from 12 to 15 are typical values for a cleaning agent

[0083] Values from 16 to 20 represent a solubilizer or hydrotrope.

[0084] Preferably, the nonionic surfactants with an HLB value in the range of 9 to 20 are selected from fatty alcohol ethoxylates, alkylphenol ethoxylates, polyoxyethylene sorbitan alkyl esters, and mixtures thereof. Preferably, the nonionic surfactant is a surfactant having at least 9 alkylene oxide groups, preferably at least 9 ethylene oxide groups.

[0085] Examples of fatty alcohol ethoxylates that can be used as nonionic surfactants in the composition include polyoxyethylene lauryl ether (HLB = 16.9; commercially available as 35), polyoxyethylene (20) cetyl ether (HLB = 16; commercially available as 58), polyoxyethylene octadecyl ether (HLB = 18.8; commercially available as 700), and Laureth-9 (C12EO9; HLB = 14.3; commercially available as L9).

[0086] Examples of alkylphenol ethoxylates that can be used as nonionic surfactants in the composition include octylphenol ethoxylate (HLB = 15.5; commercially available as Triton TM X165), octylphenol ethoxylate (HLB = 17.6; commercially available as Triton TM X405), and octylphenol ethoxylate (HLB = 18.4; commercially available as Triton TM X705).

[0087] Examples of polyoxyethylene sorbitan alkyl esters that can be used as nonionic surfactants in the composition include polyoxyethylene sorbitan monolaurate (HLB = 13.3; commercially available as 21), polyoxyethylene sorbitan monolaurate (HLB = 16.7; commercially available as 20), polyoxyethylene sorbitan monopalmitate (HLB = 15.6; commercially available as 40), and polyoxyethylene sorbitan monostearate (HLB = 14.9; commercially available as 60).

[0088] Even more preferably, the nonionic surfactant having an HLB value in the range of 9 to 20 that may be present in the composition is a fatty alcohol ethoxylate having a saturated carbon chain with an HLB above 15.5.

[0089] Preferably, the wash-free composition contains 0.5 to 5% by weight, more preferably 1 to 4% by weight, even more preferably 2 to 3% by weight of a nonionic surfactant having an HLB in the range of 9 to 20.

[0090] Preferably, the wash-free composition contains a fatty acid. The fatty acid provides a so-called vanishing cream effect when present in the composition together with the soap, that is, when the composition is applied to a person's skin, there are no significant streaks of the vanishing cream left on the skin. Preferably, the wash-free composition contains a fatty acid having 10 to 30, more preferably 12 to 25, even more preferably 14 to 20, further more preferably 16 to 18 carbon atoms. Examples of fatty acids that can be used in the composition include pelargonic acid, lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, oleic acid, linoleic acid, arachidic acid, behenic acid, erucic acid, and mixtures thereof. Preferably, the fatty acid that can be used is stearic acid or palmitic acid or a mixture thereof. The fatty acid in the present invention is preferably hystric acid, which is substantially (usually about 90 to 95%) a mixture of stearic acid and palmitic acid in a ratio of 55:45 to 45:55.

[0091] Preferably, the wash-free composition contains 2.25 to 25% by weight, more preferably 4 to 22% by weight, even more preferably 6 to 20% by weight, further more preferably 8 to 19% by weight, still more preferably 10 to 18% by weight, still more preferably 12 to 16% by weight of a fatty acid.

[0092] Preferably, the wash-free composition contains soap. The soap provides a foundation cream effect when present in the composition in combination with the fatty acid. Preferably, the soap in the wash-free composition is usually prepared by in-situ neutralization of the fatty acid that may be present in the composition. Therefore, preferably, the soap has a carbon chain length corresponding to that of the fatty acid in the composition. The soap is formed from the fatty acid by using an alkali metal hydroxide, such as sodium hydroxide or potassium hydroxide. Among the two, potassium hydroxide is more preferably used. Therefore, the soap is preferably a potassium soap (potassium salt of fatty acid).

[0093] Preferably, the wash-free composition contains 0.1 to 10% by weight, more preferably 0.25% to 8% by weight, even more preferably 0.5 to 7% by weight, further more preferably 0.5 to 5% by weight, even further more preferably 0.5% to 3% by weight of soap.

[0094] Preferably, the wash-free composition contains 5 to 99.9% by weight, more preferably 10 to 95% by weight, even more preferably 15 to 90% by weight, further more preferably 20 to 80% by weight, still more preferably 25 to 75% by weight and yet more preferably 30 to 70% by weight of water.

[0095] Preferably, the wash-free composition contains a polymer. The polymer acts as a thickener in the composition and improves the sensory properties of the composition.

[0096] The polymer is preferably selected from the following categories:

[0097] - Acrylate / R-methylacrylate copolymer, such as acrylate / steareth-20 methacrylate copolymer (commercially available as Aculyn TM 22) and acrylate / steareth-25 methacrylate copolymer (commercially available as Aculyn TM 28),

[0098] - Acrylate / R-methylacrylate crosslinked polymer, such as acrylate / steareth-20 methacrylate crosslinked polymer (commercially available as Aculyn TM 88),

[0099] - Acrylate copolymer (commercially available as Aculyn TM 33),

[0100] - Acrylate / acrylic R-alkyl ester crosslinked polymer, such as acrylate / acrylic C10-C30 alkyl ester crosslinked polymer (commercially available as Pemulen TM TR-2),

[0101] - Copolymer of acryloyldimethyltaurine ammonium and vinylpyrrolidone (commercially available as AVC),

[0102] - Copolymer of acryloyldimethyltaurine sodium and vinylpyrrolidone (commercially available as AVS); and

[0103] - Crosslinked polymer of acryloyldimethyltaurine ester and acrylic R-alkyl ester and methacrylic R-alkyl ester, for example acryloyldimethyltaurine / steareth-25 methacrylate ammonium crosslinked polymer (commercially available as HMB and BLV).

[0104] Preferably, the wash-free composition comprises 0.1 to 5% by weight, more preferably 0.25 to 4.5% by weight, even more preferably 0.5 to 4% by weight, further more preferably 0.75 to 3.5% by weight, still more preferably 0.75 to 2.75% by weight of a polymer.

[0105] Preferably, the wash-free composition comprises an emollient. Examples of emollients that can be used in the wash-free composition include stearyl alcohol, glyceryl monocastor oil, mink oil, cetyl alcohol, isopropyl isostearate, isobutyl palmitate, isocetyl stearate, oleyl alcohol, isopropyl laurate, hexyl laurate, decyl oleate, octadecane-2-ol, isocetyl alcohol, eicosanol, behenyl alcohol, cetyl palmitate, silicone oils (such as polydimethylsiloxane), dibutyl sebacate, isopropyl myristate, isopropyl palmitate, isopropyl stearate, butyl stearate, polyethylene glycol, triethylene glycol, lanolin, cocoa butter, corn oil, cottonseed oil, olive oil, palm kernel oil, rapeseed oil, safflower oil, evening primrose oil, soybean oil, sunflower oil, avocado oil, sesame oil, coconut oil, peanut oil, castor oil, acetylated lanolin alcohol, petrolatum, mineral oil, butyl myristate, isopropyl linoleate, lauryl lactate, myristyl lactate, decyl oleate, myristyl myristate, and mixtures thereof.

[0106] Preferably, the wash-free composition comprises a solvent. Examples of solvents that can be used in the composition include ethanol, isopropyl alcohol, acetone, ethylene glycol monoethyl ether, diethylene glycol monobutyl ether, diethylene glycol monoethyl ether, and mixtures thereof.

[0107] Preferably, the wash-free composition comprises a powder. Examples of powders that can be used in the composition include chalk, talc, bleaching earth, kaolin, starch, gum, colloidal silica, sodium polyacrylate, tetraalkyl and / or trialkylarylammonium smectite, chemically modified magnesium aluminum silicate, organically modified montmorillonite clay, hydrated aluminum silicate, pyrogenic silica, carboxyvinyl polymer, sodium carboxymethyl cellulose, ethylene glycol monostearate, and mixtures thereof.

[0108] Preferably, the wash-free composition comprises a preservative to prevent the growth of potentially harmful microorganisms. Examples of ingredients that can be used as preservatives in the composition include alkyl esters of p-hydroxybenzoic acid, hydantoin derivatives, propionates, and various quaternary ammonium compounds. More preferably, the ingredients that can be used as preservatives in the composition include: sodium benzoate, iodopropargyl butylcarbamate, methylisothiazolinone, iodopropynyl butylcarbamate, phenoxyethanol, methyl p-hydroxybenzoate, propyl p-hydroxybenzoate, imidazolidinyl urea, sodium dehydroacetate, ethylhexylglycerin, benzyl alcohol, alkane diols, and mixtures thereof. The alkane diols suitable for use as preservatives are C 6 -C 12Alkanes. Illustrative examples include 1,2 - octanediol (octylene glycol), 2,3 - octanediol, 1,2 - nonanediol, 1,2 - decanediol, 1,2 - hexanediol, 3,4 - octanediol, mixtures thereof or the like, where octylene glycol is generally most preferred.

[0109] When present in the leave - on composition, the preservative is preferably added in an amount of 0.001 to 5% by weight, more preferably 0.01 to 3% by weight, most preferably 0.02 to 2% by weight, and even most preferably 0.25 to 1.5%.

[0110] Preferably, the leave - on composition comprises a range of other optional ingredients, including antioxidants, binders, buffers, colorants, astringents, fragrances, sunscreens, conditioners, exfoliants, pH regulators, skin sensates, soothing agents and repair agents.

[0111] The present invention relates to a method as described in detail above herein, namely the steps of cleaning a surface with a rinse - off composition, then rinsing, and then applying a leave - on composition. Preferably, the skin is dried by wiping the surface with a towel after the rinsing step so that the surface is substantially dry to the touch. The step of applying the leave - on composition after the rinsing step can be carried out anywhere from 1 minute to 1 hour after the rinsing step. Preferably, after the rinsing step, the step of applying the leave - on composition is from 1 minute to 30 minutes, more preferably from 1 minute to 10 minutes, and even more preferably from 1 minute to 5 minutes. Preferably, the method is non - therapeutic or cosmetic in nature.

[0112] The present invention also relates to a method of providing an SPF of 10, at least 20, preferably at least 30, more preferably at least 50 to a local surface of the body. Preferably, the method is non - therapeutic or cosmetic in nature. The present invention also relates to a method of providing a UVAPF of 4, at least 8, preferably at least 12, more preferably at least 16 to the skin for a local surface of the body. Preferably, the method is non - therapeutic or cosmetic in nature.

[0113] According to another aspect of the present invention, there is provided a kit comprising:

[0114] Handheld container, which includes a pump capable of generating foam, the container contains a wash-off type composition, the wash-off type composition contains 0.1 to 10% by weight of a water-soluble UVA sunscreen; 0.1 to 10% by weight of a water-soluble UVB sunscreen; 3 to 80% by weight, preferably 6 to 80% by weight, of one or more mild surfactants selected from anionic surfactants, zwitterionic surfactants or nonionic surfactants; and a cosmetically acceptable carrier; a leave-on type composition, which contains a sunscreen and a cosmetically acceptable vehicle; and an instruction manual. Preferably, the use is non-therapeutic or cosmetic in nature.

[0115] The present invention will now be illustrated by the aid of the following non-limiting examples.

[0116] Examples

[0117] Wash-off type compositions 1 to 2:

[0118] Prepare the following skin cleansing compositions as shown in Table 1 below:

[0119] Table 1:

[0120] 1 2 Ingredient wt% wt% Potassium Cocoyl Glycinate 19% + Potassium Cocoate 11% + Water 41.1 41.1 Sodium Lauroamphoacetate 25% 12.8 12.8 Propylene Glycol, Pharmaceutical Grade 6.0 6.0 Glycerin, Pharmaceutical Grade 99.5% 6.0 6.0 Polysorbate 20 HPC 0.3 0.3 Citric Acid Monohydrate 0.18 0.18 Phenoxyethanol 0.6 0.6 Potassium Hydroxide 85% 0.002 0.002 Nicotinamide, Pharmaceutical Grade (Crystalline / Fine Powder) 0.001 0.001 Fragrance 0.85 0.45 Stay C 50 0.01 0.05 Pre-neutralized Sunscreen (1% Ensulizole, 0.3% Neoheliopan AP) 1.30 1.30 Water Up to 100 Up to 100

[0121] Leave-on type compositions 3 to 5: Prepare the following leave-on type compositions as shown in Table 2 below:

[0122] Table 2:

[0123]

[0124] Using the above samples, the following experiments were carried out:

[0125] For the wash-off type compositions, the protocol used was as follows: The pre-wetted in vitro skin was coated with a diluted wash-off type product of Composition 1 or 2. The in vitro skin was rinsed off immediately after the application of the product and kept dry in the dark. After the drying step, the in vitro skin was exposed to UV light and the transmittance scan was recorded. For a given sample, the scan gave the transmittance as a function of the wavelength (290 to 400 nm). Four different points were scanned for a single in vitro skin sample. The same operation was repeated for 2 in vitro skin samples. Therefore, the reported data is the average of 8 readings. A reference transmittance scan was obtained using blank in vitro skin, on which glycerol was spread as a control. Using the software provided by the instrument, the transmittance values were used to obtain the SPF and UVA PF values.

[0126] For the leave-on type compositions, the protocol used was as follows: On the in vitro skin after washing with Composition 1 or 2, 2 mg / cm 2The wash-free products (Composition 3 or 4 or 5) are applied to the same side of the in vitro skin that is cleaned to simulate the consumer situation. Then the applied in vitro skin is dried in the dark for 20 to 30 minutes to simulate the recommended drying time from the in vivo ISO 24444 method. After drying, the in vitro skin is exposed to UV light and the transmittance scan is recorded. For a given sample, the scan gives the transmittance as a function of wavelength (290 to 400 nm). Four different points are scanned for a single in vitro skin sample. The same operation is repeated for 2 in vitro skin samples. Thus, the reported data is the average of 8 readings. A reference transmittance scan is obtained using a blank in vitro skin, on which glycerol is spread as a control. Using the software provided by the instrument, the transmittance values are used to obtain the SPF and UVA PF values.

[0127] Example - 1: After washing with the wash-off composition 1, the SPF and UVA PF of the substrate are measured.

[0128] Example - 2: After washing with the wash-off composition 2, the SPF and UVA PF of the substrate are measured.

[0129] Example - 3: After applying the wash-free composition 3, the SPF and UVA PF of the substrate are measured.

[0130] Example - 4: After applying the wash-free composition 4, the SPF and UVA PF of the substrate are measured.

[0131] Example - 5: After applying the wash-free composition 5, the SPF and UVA PF of the substrate are measured.

[0132] Example - 6: After washing the substrate with composition 1 and then applying the wash-free composition 3, the SPF and UVA PF of the substrate are measured.

[0133] Example - 7: After washing the substrate with composition 1 and then applying the wash-free composition 4, the SPF and UVA PF of the substrate are measured.

[0134] Example - 8: After washing the substrate with composition 1 and then applying the wash-free composition 5, the SPF and UVA PF of the substrate are measured.

[0135] Example - 9: After washing the substrate with composition 2 and then applying the wash-free composition 3, the SPF and UVA PF of the substrate are measured.

[0136] Example - 10: After washing the substrate with composition 2 and then applying the wash-free composition 4, the SPF and UVA PF of the substrate are measured.

[0137] Example - 11: After cleaning the substrate with Composition 2 and then applying the no - rinse Composition 5, the SPF and UVA PF of the substrate were measured.

[0138] The SPF and UVA PF of the various examples listed above were measured, and the data are summarized in Table 3 below:

[0139] Table 3

[0140] Example SPF UVAPF 1 22.1 2.9 2 23.5 3.0 3 7.7 4.6 4 53.4 7.9 5 66.0 6.5 6 102.8 13.4 7 94.6 13.4 8 98.1 12.8 9 77.1 9.8 10 128.0 19.9 11 106.6 13.0

[0141] The data in Table 3 above show that the methods according to the invention (Examples 6 to 11) provide a synergistic improvement in terms of SPF and UVA PF over the individual steps of the methods (Examples 1 to 5).

Claims

1. A method for providing a high SPF to a local surface of the body, the method comprising the steps of: (a) cleansing the surface with a rinse-off composition produced in the form of a foam from a container comprising a pump, the rinse-off composition comprising: (i) 0.1 to 10% by weight of a water-soluble UVA sunscreen; (ii) 0.1 to 10% by weight of a water-soluble UVB sunscreen; (iii) 3 to 80% by weight, preferably 6 to 80% by weight, of one or more mild surfactants selected from anionic surfactants, zwitterionic surfactants and nonionic surfactants; and (iv) a cosmetically acceptable carrier; preferably diluted with water and then (b) rinsing the surface with water; then (c) applying a leave-on composition comprising a sunscreen and a cosmetically acceptable vehicle to the surface.

2. The method according to claim 1, wherein the anionic surfactant is selected from one or more of hydroxyethyl sulfonates, glycine salts, coconut oilates, olefin sulfonates, sulfacetates and sulfosuccinate surfactants.

3. The method according to claim 1, wherein the zwitterionic surfactant is selected from one or more of sulfobetaines, betaines and amphoacetate surfactants.

4. The method according to claim 1, wherein the nonionic surfactant is selected from one or more of polysorbates, sorbitans, polyethylene glycols and glucoside surfactants.

5. The method according to any one of the preceding claims, wherein the water-soluble UVA sunscreen and the water-soluble UVB sunscreen have a solubility in water at 25 °C higher than 10 g / l.

6. The method according to any one of the preceding claims, wherein the water-soluble UVB sunscreen is selected from phenylbenzimidazole sulfonic acid or benzylidene camphor sulfonic acid or a mixture thereof.

7. The method according to any one of the preceding claims, wherein the water-soluble UVA sunscreen is selected from disodium phenyl dibenzimidazole tetrasulfonate, terephthalylidene dicamphor sulfonic acid or a mixture thereof.

8. The method according to any one of the preceding claims, wherein the sunscreen in the leave-on composition is an organic UVA sunscreen, an organic UVB sunscreen, an inorganic sunscreen or a mixture thereof, preferably a combination of an organic UVB sunscreen and an organic UVA sunscreen.

9. The method according to claim 8, wherein the organic UVA sunscreen is butyl methoxydibenzoylmethane or diethylamino hydroxybenzoyl hexyl benzoate; the organic UVB sunscreen is ethylhexyl methoxycinnamate, octocrylene, phenylbenzimidazole sulfonic acid or ethylhexyl salicylate; and the inorganic sunscreen is zinc oxide or titanium dioxide.

10. The method according to any one of the preceding claims, wherein the cosmetically acceptable vehicle of the leave-on composition is in the form of a cream, stick, lotion, gel or spray.

11. The method according to any one of the preceding claims, wherein the step of applying the leave-on composition is carried out from 1 minute to 1 hour after the step of rinsing the surface with water.

12. A method according to one of the preceding claims, for obtaining an SPF of at least 10.

13. A kit, comprising (a) a hand-held container comprising a pump capable of generating foam, said container containing a wash-off composition containing 0.1 to 10% by weight of a water-soluble UVA sunscreen; 0.1 to 10% by weight of a water-soluble UVB sunscreen; 3 to 80% by weight, preferably 6 to 80% by weight, of one or more mild surfactants selected from anionic surfactants, zwitterionic surfactants or nonionic surfactants; and a cosmetically acceptable carrier; (b) a leave-on composition comprising a sunscreen and a cosmetically acceptable vehicle; and (c) instructions for use.

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