MXPA02000457A - Sunscreen aerosol composition. - Google Patents

Abstract

The present invention is a sunscreen composition in the form of an aerosol that foams. The composition contains a sunscreen agent, an emulsifier, a foam builder/stabilizer, a counterion, and a propellant. In addition, the ratio of the foam builder/stabilizer to counterion is about 1:4 to about 5:1.2 to ensure the foam quality and integrity.

Description

SOLAR PROTECTIVE COMPOSITION IN AEROSOL Background of the Invention I. Field of the Invention The present invention relates to sunscreens. More particularly, the present invention relates to sunscreen compositions prepared in the form of an aerosol product that foams.

II. Description of the Prior Art Sunscreen compositions are applied to the skin to protect the skin from the ultraviolet rays of the sun that can lead to erythema, a reddening of the skin also known as sunburn. Radiation of sunlight or ultraviolet in the UV-B range has a wavelength of 290nm to 320nm and is known to be the primary cause of sunburn. Ultraviolet rays at a wavelength of 320nm to 400nm, known as UV-A radiation, produce tanning of the skin. However, in the production process, UV-A rays can damage or harm the skin. In addition to the immediate disorders of sunburn, excessive exposure to sunlight can lead to REF. 135046 to alterations of the skin. For example, prolonged and constant exposure to the sun can lead to actinic keratosis and carcinomas. Another long-term effect is the premature aging of the skin. This condition is characterized by skin that wrinkles, cracks and has loss of its elasticity. As stated above, sunscreens are typically formulated with the goal of inhibiting skin damage from the sun's rays. The sunscreen composition filters or blocks damaging UV-A and UV-B rays that can damage and damage the skin. It is believed that sunscreen agents do this by the absorption of UV-A and / or UV-B rays. In general, sunscreen compositions are oil and water emulsions. In this system, the UV absorption compounds are typically incorporated in the oil phase. Sunscreens can also include oxides of physical or inorganic metals that block the sun's rays. Titanium dioxide and zinc oxide are commonly used for this purpose. Consumers consider many factors when they purchase a sunscreen product. One of the ...

Most important considerations is the sun protection factor (SPF). This determines the amount of protection that the sunscreen composition provides during a given period of time. There are many to choose from these 5 and the selection will be based on the needs of the consumer. The consumer also gives consideration to the substantivity of the product, which is how durable the product is after applying it to the skin. These effects of how often the composition will need to be applied when the consumer 10 is outside in the sun. A third consideration is the sensation of the product and how well the product will spread on the skin. Typically, consumers require a product that feels soft and silky and is applied to a smooth continuous film on the skin. Another factor is life 15 of product shelf, which is determined by the physical and chemical stability of the sunscreen composition. In addition, the shape of the product will also play a part since there is a variety of selections such as lotions, gels, creams, sprays and sprays that are 20 available. The preferred form could finally be determined if the consumer decides to buy the product. The unique product forms can be attractive to many consumers who are looking for something different. Sunscreens that are made in the form of an aerosol are not common, particularly aerosols that supply the product like a foam.

BRIEF SUMMARY OF THE INVENTION It is an object of the present invention to provide a sunscreen composition that is prepared as an aerosol product in the form of a foam. It is also an object of the present invention to provide a sunscreen composition that provides the superior foam quality. It is another object of the present invention to provide a sunscreen composition that is effective in protecting the skin against UV-A and UV-B rays. It is still another object of the present invention to provide a sunscreen composition that spreads evenly over the skin. To realize the aforementioned objects and advantages, the present inventionIn brief, it is a sunscreen composition that is prepared as an aerosol product. The composition contains a sunscreen agent, an emulsifier, a trainer / stabilizer of foam, an opposite ion, and a propellant. In a preferred embodiment, the sunscreen composition also contains an emollient, a humectant, a preservative / antioxidant, and water. In addition, the ratio of foam former / stabilizer to counter ion should be approximately 1: 4 to approximately 5: 1.2. Most preferably, the ratio is approximately 1: 1 to approximately 5: 1.

DETAILED DESCRIPTION OF THE INVENTION The present invention is a sunscreen composition in the form of an aerosol comprising a sunscreen agent, an emulsifier, a foaming agent / stabilizer, an ion counter, and a propellant.

Sunscreen agents Sunscreen agents that can be used in the present invention should be able to absorb or block the damaging effects of ultraviolet radiation. In addition, they must be non-toxic and non-irritating when applied to the skin. Suitable sunscreen agents include, for example, para-aminobenzoic acid (PABA), benzophenone-1, benzophenone-2, benzophenone-3, benzophenone-4, benzophenone-β, benzophenone-8, benzophenone-12, methoxycinnamate, ethyl dihydroxypropyl -PABA, glyceryl PABA, homosalate, methyl anthranilate, octocrylene, octyl dimethyl PABA, octyl methoxycinnamate, octyl salicylate, PABA, 2-phenylbenzimidazole-5-sulfonic acid, triethanolamine salicylate, 3- (4-methylbenzylidene) -canfor, red petrolatum, and mixtures thereof. Preferred sunscreen agents are octyl methoxycinnamate, octyl salicylate, benzophenone-3, or mixtures thereof. The sunscreen agents may be present in an amount of about 1% by weight to about 40% by weight of the total weight of the composition of the present invention. The amount of sunscreen agents in the composition will depend on the desired sun protection factor (SPF). Normally, the higher the SPF, the greater the total amount of sunscreen agents. Preferably, the sunscreen agents are included at about 4% by weight to about 30% by weight.

Emulsifiers An emulsifier is an essential component of the present invention. An emulsifier makes it possible for two or more immiscible liquids to be combined homogeneously, while increasing the viscosity of the composition. In addition, the emulsifier acts to stabilize the composition. Emulsifiers that can be used in the present invention include sorbitan oleate, sorbitan sesquioleate, sorbitan isostearate, sorbitan trioleate, polyglyceryl-3-diisostearate, polyglycerol esters of oleic / isostearic acid, polyglyceryl-β-hexaricinolate, polyglyceryl- oleate, polyglyceryl-4-oleate / PEG-8 propylene glycol cocoate, oleamide DEA, sodium glyceryl oleate phosphate, hydrogenated vegetable glyceride phosphate and mixtures thereof. In addition, one or more synthetic polymers can be used as an emulsifier. For example, PVP copolymer Eicosene, acrylates / alkyl acrylate polymer of C? 0-C30, acrylate copolymer / steareth-20 methacrylate, copolymer PEG-22 / dodecyl glycol, copolymer of PEG-45 / dodecyl glycol, and mixtures thereof. Preferred emulsifiers are PVP Eicosene copolymer, C 0 -C 30 alkyl acrylate / acrylate crosslinked polymer, PEG-20 sorbitan isostearate, sorbitan isostearate, and mixtures thereof. One or more emulsifiers are present in a total amount of about 0.01% by weight to about 15% by weight of the total weight of the composition of the present invention. Preferably, about 0.1 wt% to about 3 wt% of emulsifiers are used.

Foam Stabilizer / Former The composition of the present invention should include a foam former / stabilizer. The preferred foam former / stabilizer is cetyl phosphate, DEA cetyl phosphate, TEA myristate, stearate of TEA, magnesium stearate, sodium stearate, potassium laurate, potassium ricinoleate, sodium cocoate, sodium tallowate, potassium castorate, sodium oleate, and mixtures thereof. The foam former / stabilizer in an amount of about 0.1% to about 5% by weight should be added to the composition of the present invention. Preferably, the foam former / stabilizer is present in an amount of about 0.1% by weight to about 3% by weight.

Counter Ions Counter ions are in the composition of the present invention to neutralize components such as an emulsifier and a foam former / stabilizer. Sodium hydroxide, potassium hydroxide, diethanolamine, triethanolamine, aminomethyl propanol, trisodium 5-ethylenediaminetetraacetic acid, and mixtures thereof, are examples of suitable counter ions used in the present invention. The preferred counter ion is triethanolamine. The counter ion is present in an amount of 10 about 0.01% by weight to about 8% by weight in the composition of the present invention. Preferably, the counterion is present in an amount of about 1% by weight to about 5% by weight. A critical feature of the present invention is the ratio of the foam stabilizer / stabilizer to the counter ion. To ensure superior foam quality and integrity, the ratio should be approximately 1: 4 to approximately 5: 1.2. Preferably, the relationship is 20 approximately 1: 1 to approximately 5: 1.

Propeller The propeller must be capable of producing a pressure sufficient for the expulsion of the composition from an aerosol container. In addition, the propellant must not be irritating or toxic and must be compatible with the ingredients used in the composition. Suitable propellants are butane, isobutane, propane, dimethyl ether, dichlorodifluorornetane, tetrafluoromethane, dichlorotetrafluoroethane, chlorodifluoromethane, chlorodifluoroethane, difluoroethane, and mixtures thereof. The preferred propellant of the present invention is a mixture of isobutane and propane, commonly known as propellant A-46. The propellant is present in the range of about 3% by weight to about 15% by weight of the present invention. Preferably, the propellant is from about 5% by weight to about 9% by weight.

Water The composition of the present invention optionally may have water. The water may be present in an amount of up to about 80% by weight, preferably, from 30% by weight to 70% by weight of water.

Emollients The present composition may additionally contain one or more emollients. An emollient provides a softening or soothing effect on the surface of the skin and is generally considered safe for topical use. The emollient also helps control the rate of evaporation and the viscosity of the composition. Preferred emollients include mineral oil, lanolin oil, coconut oil, cocoa butter, olive oil, aloe extracts, jojoba oils, castor oil, fatty acids such as oleic and stearic acid, fatty alcohols such as cetyl, hexadecyl (ENJAY), diisopropyl adipate, hydroxybenzoate esters, benzoic acid esters of Cg-C15 alcohols, isononyl iso-nonanoate, alkanes such as mineral oil, silicones such as dimethylpolysiloxane, ethers such as polyoxypropylene butyl ethers and polyoxypropylene cetyl ethers , and C 2 -C 6 alkyl bezoates and mixtures thereof. The most preferred emollients are esters of hydroxybenzoate, aloe vera, alkyl benzoates Ci2_Ci5, and mixtures thereof. The emollient is present in an amount of about 1% by weight up to about 20% of the total weight of the composition. The preferred amount of emollient is about 2% by weight to about 15% by weight, and most preferably about 4% by weight to about 10% by weight.

Moisturizers A wetting agent, such as a humectant, can be incorporated in the present invention. Suitable humectants include glycerin, polyethylene glycol, polypropylene glycol, sorbitol, PEG-4, and mixtures thereof. One or more humectants are optionally present at approximately 0.5% by weight a approximately 10 8% by weight in the present invention. Preferably, about 1% by weight to about 5% by weight of humectants can be used.

Titanium Dioxide 15 Optionally, titanium dioxide can be added to the composition of the present invention. This material is generally considered safe for topical use since it is physiologically inert and has a low degree of irritation and toxicity. It works by reflecting and 20 absorb sunlight. In the present invention, titanium dioxide is suspended throughout the composition. The composition of the present invention may have about 0.5% by weight to about 10% by weight. weight of titanium dioxide. Preferably, about 1% by weight to about 3% by weight of titanium dioxide is present.

Preservatives / Antioxidants Optionally, preservatives / antioxidants may be in the present composition. The diazolidinylurea, iodopropynyl butylcarbamate, vitamin E, vitamin E acetate, vitamin C, butylated hydroxytoluene, ethylparaben and mixtures thereof compounds may be a preservative / antioxidant in the present composition. One or more preservatives / antioxidants may be present in an amount of about 0.01% by weight to about 2% by weight of the total weight of the present invention. Preferably, one or more preservatives / antioxidants are present in an amount from about 0.1% by weight to about 1% by weight.

Rheological Additives The present invention may include a rheological additive, such as magnesium aluminum silicate, hydroxypropylcellulose, carbomer, cellulose, guar gum, xanthan gum, bentonite, acrylate copolymers, and mixtures thereof. The rheological additive assists in the viscosity formation of the present invention. The rheological additive may optionally be present at about 0.05 wt% to about 5 wt% in the composition of the present invention. Preferably, about 0.1 wt% to about 2 wt% of rheological additives are present in the present composition.

Optional Additives The sunscreen composition of the present invention may also contain optional additives. For example, a fragrance, colorant, plant extract, absorbent, waterproofing agent, and mixtures thereof may be included.

Process The process used for the production of the present invention must be capable of forming a homogenous composition that can be sprayed or administered from an aerosol can. Typically, aerosol products are made by filling a concentrate in a can and then filling the can with propellant under vacuum conditions. The concentrate of the present invention can be prepared using techniques and methods well known in the art. In general, the ingredients are incorporated by mixing and by the application of heat if necessary, until the concentrate is uniform and homogeneous. If necessary, the concentrate can be homogenized to ensure homogeneity. The concentrate is then placed in a spray can which is finally filled with a propellant. Having thus described the present invention with reference to the preferred embodiments thereof, it will be apparent that various changes and modifications may be made herein, without departing from the spirit and scope of the invention as defined in the appended claims.

It is noted that in relation to this date, the best method known by the applicant to carry out the aforementioned invention, is that which is clear from the present description of the invention. - "" - ^ ¿sS

Claims (22)

1. CLAIMS Having described the invention as above, the content of the following claims is claimed as property: 1. A sunscreen composition characterized in that it comprises: (a) a sunscreen agent; (b) an emulsifier; (c) a foam former / stabilizer; (d) an opposite ion; and (e) a propeller. 2. The composition according to claim 1, characterized in that the ratio of foam former / stabilizer to the counter ion is approximately 1: 4 to approximately 5: 1.2. The composition according to claim 1, characterized in that the foam former / stabilizer is selected from the group consisting of cetyl phosphate, DEA cetyl phosphate, sodium stearate, potassium ricinoleate, sodium tallowate, and mixtures thereof . 4. The composition according to claim 1, characterized in that the foamer / stabilizer is about 0.1% by weight to about 5% by weight of the total weight of the composition. The composition according to claim 1, characterized in that the counter ion is selected from the group consisting of sodium hydroxide, potassium hydroxide, diethanolamine, triethanolamine, aminomethyl propanol, trisodium ethylenediaminetetraacetic acid, and mixtures thereof . 6. The composition according to claim 1, characterized in that the counter ion is about 0.01% by weight to about 8% by weight of the total weight of the composition. The composition according to claim 1, characterized in that the sunscreen agent is from about 4% by weight to about 30% by weight of the total weight of the composition. The composition according to claim 7, characterized in that the sunscreen agent is selected from the group consisting of benzophenone-3, octyl methoxycinnamate, octyl salicylate, homosalate, and mixtures thereof. 9. The composition according to claim 1, characterized in that the emulsifier is about 0.01% by weight to about 15% by weight of the total weight of the composition. 10. The composition according to claim 9, characterized in that the emulsifier is selected from the group consisting of PVP copolymer. Eicosene, sorbitan isostearate, cross-linked polymer of acrylates / alkyl acrylate of C? O-C30 / isostearate of PEG-20 sorbitan, and mixtures thereof. 11. The composition according to claim 1, characterized in that the propellant is a mixture of isobutane and propane. 12. The composition according to claim 1, characterized in that it also comprises water. 13. The composition according to claim 1, characterized in that it also comprises an emollient. The composition according to claim 13, characterized in that the emollient is selected from the group consisting of hydroxybenzoate esters, C12-C15 alkyl benzoates, aloe vera, and mixtures thereof. 15. Composition in accordance with "* * -" - * * * * - claim 1, characterized in that it also comprises a humectant. 16. The composition according to claim 15, characterized in that the humectant is PEG-4. 17. The composition according to claim 1, characterized in that it also comprises titanium dioxide. 18. The composition according to claim 1, characterized in that it also comprises a rheological additive. 19. The composition according to claim 18, characterized in that the rheological additive is magnesium aluminum silicate. The composition according to claim 1, characterized in that it also comprises a preservative / antioxidant. The composition according to claim 20, characterized in that the preservative / antioxidant is selected from the group consisting of diazolidinylurea, iodopropynyl butylcarbamate, vitamin E, vitamin E acetate, vitamin C, butylated hydroxytoluene, methylparaben and mixtures thereof. 22. The composition of claim 1, characterized in that it also comprises optional ingredients selected from the group consisting of fragrances, colorants, plant extracts, absorbers, waterproofing agents and mixtures thereof.