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Cosmetic or dermatological sunscreens

A technology of protonating agent and quaternizing agent, which is applied in the direction of cosmetic preparations, skin care preparations, cosmetics, etc., and can solve the problems of dispersion and inability to ensure the best application of the skin

Inactive Publication Date: 2008-10-08
BASF AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the aforementioned inorganic filters have the disadvantage that when used in the preparation of cosmetic or dermatological preparations there are often dispersion problems due to the sedimentation of particulate matter in cosmetic formulations, which means that an optimum application to the skin cannot be guaranteed

Method used

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  • Cosmetic or dermatological sunscreens
  • Cosmetic or dermatological sunscreens
  • Cosmetic or dermatological sunscreens

Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0140] 400 g of water and 46 g of dimethyldiallylammonium chloride solution (65% strength) were added to a stirrer. 10% of feedstock 1 consisting of 270 g of N-vinylpyrrolidone and 0.6 g of N,N'-divinylethyleneurea was added to this initial charge. The mixture was heated to 60° C. under a stream of nitrogen with stirring, then starting material 1 was metered in over a period of 3 hours, and then 0.9 g of 2,2′-azobis(2-amidinopropane was added over a period of 4 hours to ) dihydrochloride and 100 g of water starting material 2 was metered in. After 3 hours, the mixture was diluted with 700 g of water and stirred for another 1 hour. Then, a solution of 1.5 g of 2,2'-azobis(2-amidinopropane) dihydrochloride in 30 g of water was added and the mixture was stirred at 60° C. for a further 2 hours. This gave a colorless, highly viscous polymer solution with a solids content of 20.9% and a K value of 80.3.

preparation Embodiment 2

[0142] Add 300 g of N-vinylpyrrolidone by 200 g, 77 g of dimethyl diallyl ammonium chloride solution (65% concentration), 1.13 g of N, N'-divinyl ethylene urea and 440 g of water consisted of starting material 1, and the mixture was then heated to 60° C. with stirring and nitrogen flow. The remainder of starting material 1 was metered in over 2 hours, then starting material 2 consisting of 0.75 g of 2,2'-azobis(2-amidinopropane) dihydrochloride and 100 g of water was metered in over a period of 4 hours. When the addition of starting material 1 was complete, the reaction mixture was diluted with 1620 g of water. When the addition of starting material 2 was complete, the mixture was stirred at 60° C. for a further 1 hour, then a solution of 1.25 g of 2,2′-azobis(2-amidinopropane) dihydrochloride in 65 g of water was added, The mixture was stirred for another 1 hour. This gave a colorless, highly viscous polymer solution with a solids content of 10.2% and a K value of 80.

preparation Embodiment 3

[0144] 130 g of water and 48 g of 3-methyl-1-vinylimidazolium chloride were added to a stirrer, and the resulting mixture was heated to 60° C. under a nitrogen stream with stirring. Then, starting material 1 consisting of 192 g of N-vinylpyrrolidone, 0.48 g of N,N'-divinylethylene urea and 450 g of water was metered in over 3 hours, and then 1.44 g of Feedstock 2, consisting of 2,2'-azobis(2-amidinopropane) dihydrochloride and 80 g of water, was metered in. The mixture was then stirred at 60°C for an additional 1 hour. In order to keep the mixture in a stirrable state, it was diluted with a total of 2100 g of water as needed. This gave a colorless, highly viscous polymer solution with a solids content of 8.2% and a K value of 105.

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Abstract

The invention relates to mixtures comprising A) at least one copolymer obtainable by (i) free-radically initiated solution polymerization of a monomer mixture of (a) 0.01 to 99.99% by weight of at least one monomer chosen from the group consisting of N-vinylimidazoles and diallylamines, optionally in partially or completely quaternized form; (b) 0.01 to 99.99% by weight of at least one neutral or basic water-soluble monomer which is different from (a); (c) 0 to 50% by weight of at least one unsaturated acid or an unsaturated anhydride; (d) 0 to 50% by weight of at least one free-radically copolymerizable monomer which is different from (a), (b) and (c); and (e) 0 to 10% by weight of at least one monomer having at least two ethylenically unsaturated nonconjugated double bonds which acts as crosslinker, and (ii) subsequent partial or complete quaternization or protonation of the polymer where the monomer (a) is not quaternized or only partially quaternized and B) at least one inorganic UV filter and to the use thereof for the preparation of cosmetic or dermatological light protection agent preparations.

Description

[0001] This application is a divisional application of the invention patent application with application number 01104640.6 and application date of February 16, 2001. technical field [0002] The present invention relates to a mixture of at least one copolymer obtainable by solution polymerization and at least one inorganic UV filter, and to its use for the production of cosmetic and dermatological sunscreen preparations. Background technique [0003] Sunscreens used in cosmetic and dermatological preparations have the effect of preventing or at least reducing the extent of the harmful effects of sunlight on human skin. In addition, however, these sunscreens also serve to protect other ingredients from the decomposition or degradation effects of ultraviolet radiation. In hair cosmetic formulations, the goal is to prevent the damaging effects of UV rays on keratin fibers. [0004] Sunlight reaching the Earth's surface has a proportion of UV-B radiation (280 to 320 nanometers)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61K8/81A61K8/25A61K8/26A61K8/27A61K8/28A61K8/29A61K8/19A61K31/795A61K31/79A61P17/16A61Q17/04A61K8/00
CPCA61K8/817A61K8/27A61K8/8182A61Q17/04A61K8/29A61P39/00
Inventor P·赫塞尔T·温施R·迪英
Owner BASF AG
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