Skin care product with sun protection factor for products stored in a jar iii

Abstract

Cosmetic oil-in-water emulsion (O / W emulsion) containing a) hydroxypropyl starch phosphate, b) 2-phenylbenzimidazole-5-sulfonic acid salts, c) dipropylene glycol dibenzoate.

Description

[0001] Beiersdorf Aktiengesellschaft Hamburg

[0002] Description

[0003] Skin care products with sun protection factor for jarred products III

[0004] The present invention relates to a cosmetic oil-in-water emulsion (O / W emulsion) containing hydroxypropyl starch phosphate (INCI: Hydroxypropyl Starch Phosphate), 2-phenylbenzimidazole-5-sulfonic acid salts and dipropylene glycol dibenzoate (INCI: Dipropylene Glycol Dibenzoate).

[0005] 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.

[0006] 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.

[0007] 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.

[0008] A special type of sun protection product is the preparation offered in a jar for application. These products are usually intended for daily skincare. Jar products have a significantly higher viscosity and a higher yield point than tube or bottle products. Unlike these, they are not meant to flow out of the jar simply due to gravity. For this purpose, thickening agents are added to the preparations (usually emulsions). In the past, these were often acrylate-based polymers (e.g., polyacrylamides, polyacrylates, acrylate copolymers), the use of which is now to be avoided due to their synthetic origin and the associated slow biodegradability.

[0009] As an alternative to synthetic polymers, natural, plant-based polymers or their derivatives can also be used. However, these have several disadvantages: Many of these polymers have only a slight viscosity-increasing effect. They are therefore unsuitable for jarred products. Furthermore, the sensory experience is insufficient: The preparations form rolls when applied to the skin and / or stretch into long strands when removed from the jar. This is, for example, a common problem with jarred products thickened with xanthan gum.

[0010] Another alternative to synthetic polymers are lipophilic components that are solid at room temperature and normal pressure, such as myristyl myristate or other waxes, which can thicken the oil phase. However, these compounds only slightly increase the yield point and result in a dull, unpleasant sensory experience. Furthermore, their addition leads to a richer sensory profile, which is undesirable in many products.

[0011] The object of the present invention was therefore to develop a jar-compatible sunscreen with a high yield point and high viscosity, in which the use of synthetic polymers and xanthan gum could be avoided. The preparation should be sensorially appealing, form as few strings as possible when removed from the jar, and exhibit reduced rolling when spread on the skin.

[0012] The problems are surprisingly solved by a cosmetic oil-in-water emulsion (O / W emulsion) containing a) hydroxypropyl starch phosphate (INCI: Hydroxypropyl Starch Phosphate), b) 2-phenylbenzimidazole-5-sulfonic acid salts, c) dipropylene glycol dibenzoate (INCI: Dipropylene Glycol Dibenzoate).

[0013] According to the invention, these preparations are advantageously characterized by the fact that the preparation has a consistency of 8 to 25 SKT, measured with a consistency tester (consistency tester KO-82 according to Dr. Fligge, 25°C, measured after 24h).

[0014] This consistency tester is also disclosed in German patent application 2909087.

[0015] Furthermore, according to the invention, it is advantageous if the preparation has a yield strength maximum of more than 15x10 6mPa·s and exhibits a maximum shear stress of more than 22 Pa (measured with SR-2000 at 25°C (stress ramp linear 0–400 Pa at 40 Pa / min and 350 measurement points)). Furthermore, it was surprising to those skilled in the art that an increase in viscosity and yield strength was achieved with hydroxypropyl starch phosphate. The polymeric thickeners are usually located in the aqueous phase of the emulsion. This is also the case with hydroxypropyl starch phosphate and xanthan gum. While xanthan gum shows a clear yield strength in a purely aqueous solution, this is not the case with hydroxypropyl starch phosphate.

[0016] According to the invention, it is preferred if the preparation according to the invention is free from polyacrylates (INCI: Carbomere), 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.

[0017] Advantageous embodiments of the present invention are characterized in that the preparation contains hydroxypropyl starch phosphate (INCI: Hydroxypropyl Starch Phosphate) in a concentration of 0.2 to 3.0 wt%, based on the total weight of the preparation.

[0018] Furthermore, it is advantageous in the sense of the present invention if the preparation contains 2-phenylbenzimidazole-5-sulfonic acid salts in a concentration of 0.25 to 3 wt%, based on the total weight of the preparation.

[0019] Furthermore, the advantageous embodiments of the present invention are characterized in that the preparation contains the sodium salt as 2-phenylbenzimidazole-5-sulfonic acid salts.

[0020] It is particularly advantageous according to the invention if the preparation contains dipropylene glycol dibenzoate (INCI: Dipropylene Glycol Dibenzoate) in a concentration of 0.1 to 5% by weight, based on the total weight of the preparation.

[0021] Furthermore, according to the invention, it is advantageous if the preparation is free of xanthan gum (INCI: Xanthan Gum) and myristyl myristate (INCI: Myristyl Myristate).

[0022] On the other hand, it is advantageous in the sense of the present invention if the preparation contains isopropyl palmitate (INCI: Isopropyl Palmitate) and / or isopropyl myristate (INCI: Isopropyl Myristate).

[0023] In such a case, it is advantageous according to the invention if the preparation contains isopropyl palmitate (INCI: Isopropyl Palmitate) in a concentration of 0.25 to 4.0 wt%, based on the total weight of the preparation. The advantageous concentration according to the invention for isopropyl myristate (INCI: Isopropyl Myristate) is 0.25 to 5 wt%, based on the total weight of the preparation.

[0024] Furthermore, advantageous embodiments of the present invention are characterized in that the preparation contains glyceryl stearate (INCI: Glyceryl Stearate) and / or cetearyl alcohol. A preparation containing both glyceryl stearate (INCI: Glyceryl Stearate) and cetearyl alcohol is the preferred embodiment.

[0025] According to the invention, glyceryl stearate (INCI: Glyceryl Stearate) can advantageously be contained in a concentration of 0.5 to 5 wt%, based on the total weight of the preparation, and cetyl alcohol is advantageously used in a concentration of 1 to 6 wt%, based on the total weight of the preparation.

[0026] To produce an effective sunscreen, in addition to the 2-phenylbenzimidazole-5-sulfonic acid salts, further UV light filters are of course required. According to the invention, it has proven particularly advantageous to use one or more compounds selected from the group consisting of 4-(tert-butyl)-4'-methoxydibenzoylmethane, ethylhexyl salicylate, and 2,4-bis-{[4-(2-ethylhexyloxy)-2-hydroxy]-phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine (INCI: Bis-Ethylhexyloxyphenol methoxyphenyl Triazine) as further UV filters.

[0027] Furthermore, the preparation according to the invention may contain other ingredients that are commonly used in such products.

[0028] According to the invention, the preparation according to the invention includes, not least, a crucible containing glass, polyethylene terephthalate (PET) or polypropylene (PP).

[0029] comparative experiment

[0030] The following formulations were produced and their viscosity, yield point and sensory properties were investigated:

[0031] The structure of the samples is reflected in the maximum viscosity and maximum shear stress. The higher the maximum viscosity and shear stress, the stronger the structures. This indicates that the formulation in Comparison 2 exhibits a weaker structure.

[0032] Furthermore, two aqueous solutions, each containing 1 wt% xanthan gum and hydroxypropyl starch, were prepared, and their yield strength was determined. These solutions are described in Comparisons 3 and 4.

[0033] The measurement of the yield stresses shows that the aqueous solution with hydroxypropyl starch does not exhibit a maximum and therefore has no yield stress structure. In contrast, the solution with xanthan gum exhibits a yield stress structure with a clear maximum.

[0034] Examples

[0035] The following examples are intended to illustrate the present invention without limiting it. Unless otherwise stated, all quantities, proportions, and percentages are based on the weight and total quantity or total weight of the preparations.

Claims

Patent claims 1. Cosmetic oil-in-water emulsion (O / W emulsion) containing a) hydroxypropyl starch phosphate (INCI: Hydroxypropyl Starch Phosphate), b) 2-phenylbenzimidazole-5-sulfonic acid salts, c) dipropylene glycol dibenzoate (INCI: Dipropylene Glycol Dibenzoate).

2. Cosmetic emulsion according to claim 1, characterized in that the preparation has a consistency of 8 to 25 SKT, measured with a consistency tester (consistency tester KO-82 according to Dr. Fligge, 25°C, measured after 24h) 3. Cosmetic emulsion according to one of the preceding claims, characterized in that the preparation has a yield strength maximum of more than 15x10 6 mPa.s and exhibits a maximum shear stress of more than 22 Pa (measured with SR-2000 at 25°C (StressRamp linear 0 - 400 Pa with 40 Pa / min and 350 measuring points).

4. Cosmetic emulsion according to any of the preceding claims, characterized in that it 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.

5. Cosmetic emulsion according to one of the preceding claims, characterized in that the preparation contains hydroxypropyl starch phosphate (INCI: Hydroxypropyl Starch Phosphate) in a concentration of 0.2 to 3.0 wt%, based on the total weight of the preparation.

6. Cosmetic emulsion according to one of the preceding claims, characterized in that the preparation contains 2-phenylbenzimidazole-5-sulfonic acid salts in a concentration of 0.25 to 3.0 wt%, based on the total weight of the preparation.

7. Cosmetic emulsion according to one of the preceding claims, characterized in that the preparation contains dipropylene glycol dibenzoate (INCI: Dipropylene Glycol Dibenzoate) in a concentration of 0.1 to 5.0 wt%, based on the total weight of the preparation.

8. Cosmetic emulsion according to one of the preceding claims, characterized in that the preparation is free of xanthan gum (INCI: Xanthan Gum) and myristyl myristate (INCI: Myristyl Myristate).

9. Cosmetic emulsion according to one of the preceding claims, characterized in that the preparation contains isopropyl palmitate (INCI: Isopropyl Palmitate) and / or isopropyl myristate (INCI: Isopropyl Myristate).

10. Cosmetic emulsion according to one of the preceding claims, characterized in that the preparation contains isopropyl palmitate (INCI: Isopropyl Palmitate) in a concentration of 0.25 to 4.0 wt%, based on the total weight of the preparation.

11. Cosmetic emulsion according to one of the preceding claims, characterized in that the preparation contains isopropyl myristate (INCI: Isopropyl Myristate) in a concentration of 0.25 to 5 wt%, based on the total weight of the preparation.

12. Cosmetic emulsion according to one of the preceding claims, characterized in that the preparation contains the sodium salt as 2-phenylbenzimidazole-5-sulfonic acid salts.

13. Cosmetic emulsion according to one of the preceding claims, characterized in that the preparation contains glyceryl stearate (INCI: Glyceryl Stearate) and / or cetyl alcohol.

14. Cosmetic emulsion according to one of the preceding claims, characterized in that the preparation contains as further UV filters one or more compounds selected from the group consisting of 4-(tert-Butyl)-4'-methoxydibenzoylmethane, ethylhexyl salicylate and 2,4-Bis-{[4-(2-ethyl-hexyloxy)-2-hydroxy]-phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine (INGI: Bis-Ethylhexyloxyphenol methoxyphenyl Triazine).

15. Crucible container made of glass, polyethylene terephthalate (PET) or polypropylene (PP) containing a preparation according to any of the preceding claims.

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