Sunscreen with hectorite

Abstract

Use of hectorite (INCI: hectorite) in cosmetic emulsions for reducing the droplet size distribution of the emulsion droplets and for increasing the homogeneity of the droplet size distribution of the emulsion droplets.

Description

[0001] Beiersdorf Aktiengesellschaft

[0002] Hamburg

[0003] Description

[0004] Sunscreen with hectorite

[0005] The present invention relates to the use of hectorite (INCI: Hectorite) in cosmetic emulsions to reduce the droplet size distribution of the emulsion droplets and to increase the homogeneity of the droplet size distribution of the emulsion droplets.

[0006] The trend away from a pale complexion and towards a "healthy, sporty tan" has been unbroken for years. To achieve this, people expose their skin to sunlight, as this stimulates pigment production in the form of melanin. However, the ultraviolet radiation in sunlight also has a damaging effect on the skin. In addition to acute damage (sunburn), long-term damage such as an increased risk of developing skin cancer occurs with excessive exposure to UVB light (wavelength: 280-320 nm). Furthermore, excessive exposure to UVB and UVA radiation (wavelength: 320-400 nm) leads to a weakening of the elastic and collagen fibers of the connective tissue. This results in numerous phototoxic and photoallergic reactions and premature skin aging.

[0007] To protect the skin, a number of sunscreen filters have been developed that can be used in cosmetic preparations. These UVA and UVB filters are listed in positive lists in most industrialized countries, such as Annex 7 of the Cosmetics Regulation.

[0008] However, the large number of commercially available sunscreens should not obscure the fact that these state-of-the-art preparations have a number of disadvantages.

[0009] Sunscreens are usually formulated as emulsions. Emulsions are a popular formulation for several reasons, including their ease of application to the skin and the ability to incorporate both water-soluble and oil-soluble UV filters. Furthermore, they typically offer higher UV protection than single-phase formulations.

[0010] For sunscreen emulsions to achieve a high sun protection factor, they should spread evenly on the skin and have a uniform droplet size. Both of these effects can be influenced to some extent by the manufacturing process. However, there remains a significant need to optimize droplet size uniformity through formulation components.

[0011] The objective of the present invention was therefore to find means and methods to further standardize the droplet size of an emulsion.

[0012] The problem is surprisingly solved by using hectorite (INCI: Hectorite) in cosmetic emulsions to reduce the droplet size distribution of the emulsion droplets.

[0013] Furthermore, the problem is surprisingly solved by using hectorite (INCI: Hectorite) in cosmetic emulsions to increase the homogeneity of the droplet size distribution of the emulsion droplets.

[0014] According to the invention, it is advantageous if the emulsion is in the form of an oil-in-water emulsion.

[0015] In such a case, it is preferred according to the invention if the emulsion contains an emulsifier system consisting of glyceryl stearate citrate (INCI: Glyceryl Stearate Citrate), polyglyceryl-3 methylglucose distearate (INCI: Polyglyceryl-3 Methylglucose Distearate) and glyceryl stearate (INCI: Glyceryl Stearate).

[0016] Furthermore, advantageous embodiments according to the invention are characterized in that the preparation contains one or more UV filters.

[0017] According to the invention, it is preferred if the emulsion according to the invention contains a UV filter system consisting of hexyl 2-[4-(diethylamino)-2-hydroxybenzoyl]benzoate (INCI: Diethylamino hydroxybenzoyl hexyl benzoate), 4-(tert-Butyl)-4'-methoxydibenzoylmethane, 2,4,6-Tris-[anilino-(p-carbo-2'-ethyl-T-hexyloxy)]-1,3,5-triazine (INCI: Ethylhexyl Triazone) and 2,4-Bis-{[4-(2-ethyl-hexyloxy)-2-hydroxy]-phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine (INCI: Bis-Ethylhexyloxyphenol methoxyphenyl Triazine).

[0018] According to the invention, it is advantageous if the emulsion contains hectorite (INCI: Hectorite) in a concentration of 0.5 to 1% by weight, based on the total weight of the preparation.

[0019] If the preparation according to the invention contains glyceryl stearate citrate, it is preferred in the sense of the present invention if the emulsion contains glyceryl stearate citrate (INCI: Glyceryl Stearate Citrate) in a concentration of 0.1 to 0.2 wt%, based on the total weight of the preparation.

[0020] If the emulsion according to the invention contains polyglyceryl-3-methylglucose distearate, the embodiments preferred according to the invention are characterized in that the emulsion contains polyglyceryl-3-methylglucose distearate (INCI: Polyglyceryl-3 Methylglucose Distearate) in a concentration of 0.5 to 1% by weight, based on the total weight of the preparation.

[0021] If the emulsion according to the invention contains glyceryl stearate, it is preferred according to the invention if the emulsion contains glyceryl stearate (INCI: Glyceryl Stearate) in a concentration of 0.1 to 0.3 wt%, based on the total weight of the preparation.

[0022] For the UV filter combination advantageous according to the invention, the following application concentrations could be identified as preferred according to the invention:

[0023] Hexyl 2-[4-(diethylamino)-2-hydroxybenzoyl]benzoate (INCI: Diethylamino hydroxybenzoyl hexyl benzoate) is preferably used according to the invention in a concentration of 2 to 3 wt%, based on the total weight of the preparation.

[0024] According to the invention, 4-(tert-Butyl)-4'-methoxydibenzoylmethane is preferably used in a concentration of 4 to 5 wt%, based on the total weight of the preparation.

[0025] 2,4,6-Tris-[anilino-(p-carbo-2'-ethyl-T-hexyloxy)]-1,3,5-triazine (INCI: Ethylhexyl Triazone) is preferably used according to the invention in a concentration of 1 to 2 wt%, based on the total weight of the preparation.

[0026] 2,4-Bis-{[4-(2-ethyl-hexyloxy)-2-hydroxy]-phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine (INCI: Bis-Ethylhexyloxyphenol methoxyphenyl Triazine) is preferably used according to the invention in a concentration of 3 to 4 wt%, based on the total weight of the preparation.

[0027] Last but not least, advantageous embodiments of the present invention are characterized in that the preparation is free of polyacrylates (INCI: Carbomers), 3,3,5-trimethylcyclohexyl 2-hydroxybenzoate (INCI: Homosalate), 3-(4-methylbenzylidene)-camphor, 2-hydroxy-4-methoxybenzophenone (INCI: Oxybenzone), ethylhexyl 2-cyano-3,3-diphenyl acrylate (INCI: Octocrylene), 2-ethylhexyl 3-(4-methoxyphenyl)prop-2-enoate (INCI: Ethylhexyl Methoxycinnamate), polyethylene glycol, polyethylene glycol ethers and polyethylene glycol esters (so-called PEG derivatives), parabens, methylisothiazolinone, chloromethylisothiazolinone, and DMDM ​​hydantoin. Comparative experiment / execution example

[0028] The following formulations were produced and examined:

[0029]

[0030] 1 = Droplet size distribution determined by static laser light diffraction

[0031] 2= Raman spectroscopy (Malvern Instruments)

Claims

Patent claims 1. Use of hectorite (INCI: Hectorite) in cosmetic emulsions to reduce the droplet size distribution of the emulsion droplets.

2. Use of hectorite (INCI: Hectorite) in cosmetic emulsions to increase the homogeneity of the droplet size distribution of the emulsion droplets.

3. Use according to claim 1 or 2, characterized in that the emulsion is an oil-in-water emulsion.

4. Use according to one of the preceding claims, characterized in that the emulsion contains an emulsifier system consisting of glyceryl stearate citrate (INCI: Glyceryl Stearate Citrate), polyglyceryl-3 methylglucose distearate (INCI: Polyglyceryl-3 Methylglucose Distearate) and glyceryl stearate (INCI: Glyceryl Stearate).

5. Use according to one of the preceding claims, characterized in that the preparation contains one or more UV filters.

6. Use according to one of the preceding claims, characterized in that it comprises a UV filter system made of hexyl 2-[4-(diethylamino)-2-hydroxybenzoyl]benzoate (INCI: Diethylamino hydroxybenzoyl hexyl benzoate), 4-(tert-Butyl)-4'-methoxydibenzoylmethane, 2,4,6-Tris-[anilino-(p-carbo-2'-ethyl-T-hexyloxy)]-1,3,5-triazine (INCI: Ethylhexyl Triazone) and 2,4-Bis-{[4-(2-ethyl-hexyloxy)-2-hydroxy]-phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine (INCI: Bis-Ethylhexyloxyphenol methoxyphenyl Triazine).

7. Use according to one of the preceding claims, characterized in that the emulsion contains Hectorite (INCI: Hectorite) in a concentration of 0.5 to 1% by weight, based on the total weight of the preparation.

8. Use according to one of the preceding claims, characterized in that the emulsion contains glyceryl stearate citrate (INCI: Glyceryl Stearate Citrate) in a concentration of 0.1 to 0.2 wt%, based on the total weight of the preparation.

9. Use according to one of the preceding claims, characterized in that the emulsion contains polyglyceryl-3 methylglucose distearate (INCI: Polyglyceryl-3 Methylglucose Distearate) in a concentration of 0.5 to 1% by weight, based on the total weight of the preparation.

10. Use according to one of the preceding claims, characterized in that the emulsion contains glyceryl stearate (INCI: Glyceryl Stearate) in a concentration of 0.1 to 0.3 wt%, based on the total weight of the preparation.

11. Use according to any of the preceding claims, characterized in that the emulsion contains hexyl 2-[4-(diethylamino)-2-hydroxybenzoyl]benzoate (INCI: contains diethylamino hydroxybenzoyl hexyl benzoate) in a concentration of 2 to 3% by weight, based on the total weight of the preparation.

12. Use according to any of the preceding claims, characterized in that the emulsion contains 4-(tert-Butyl)-4'-methoxydibenzoylmethane in a concentration of 4 to 5 wt%, based on the total weight of the preparation.

13. Use according to any of the preceding claims, characterized in that the emulsion contains 2,4,6-Tris-[anilino-(p-carbo-2'-ethyl-T-hexyloxy)]-1,3,5-triazine (INCI: Ethylhexyl Triazone) in a concentration of 1 to 2 wt%, based on the total weight of the preparation.

14. Use according to any of the preceding claims, characterized in that the emulsion contains 2,4-bis-{[4-(2-ethyl-hexyloxy)-2-hydroxy]-phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine (INCI: Bis- Ethylhexyloxyphenol methoxyphenyl Triazine) in a concentration of 3 to 4 wt%, based on the total weight of the preparation.

15. Use according to any of the preceding claims, characterized in that the preparation is free of polyacrylates (INCI: Carbomere), 3,3,5-trimethylcyclohexyl 2-hydroxybenzoate (INCI: Homosalate), 3-(4-methylbenzylidene)-camphor, 2-hydroxy-4-methoxybenzophenone (INCI: Oxybenzone), ethyl hexyl-2-cyano-3,3-diphenyl acrylate (INCI: Octocrylene), 2-ethylhexyl 3-(4-methoxyphenyl)prop-2-enoate (INCI: Ethylhexyl Methoxycinnamate), polyethylene glycol, polyethylene glycol ethers and polyethylene glycol esters (so-called PEG derivatives), parabens, methylisothiazolinone, chloromethylisothiazolinone and DMDM ​​hydantoin.

Images