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Sunscreen cosmetic

A technology of cosmetics and chemical formulas, applied in the direction of cosmetics, skin care preparations, etc., can solve the problems of inducing skin cancer, skin aging, etc., and achieve the effect of high ultraviolet absorption performance

Inactive Publication Date: 2009-01-21
SHISEIDO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] But in recent years, we have gradually learned that the ultraviolet rays in the UV-B area only reach the surface of the skin, while the ultraviolet rays in the UV-A area will reach the deep part of the skin, which not only promotes skin aging but also induces skin cancer.

Method used

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  • Sunscreen cosmetic
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0126] The present invention is specifically described below by way of examples. However, the present invention is not limited by these Examples.

[0127] [the first invention]

[0128]

Synthetic example 1-1

[0129] "Synthesis Example 1-1: Synthesis of 2-[4-(2-ethylhexyloxy)-2-hydroxyphenyl]-2H-benzotriazole"

[0130] 45.4g (0.20mol) of 6-(2H-benzotriazol-2-yl) resorcinol synthesized according to conventional methods was added in a 500ml four-necked flask equipped with a thermometer and a reflux condenser, and 50ml of methyliso Butyl ketone and 4.0 g of dimethylformamide were stirred. 25.4 g (0.24 mol) of sodium carbonate and 77.2 g (0.40 mol) of 2-ethylhexyl bromide were added thereto, and heated to reflux temperature while stirring. Stir for 15 hours while maintaining the reflux temperature, then recover methyl isobutyl ketone under normal pressure, wash the remaining oil with water, and remove excess sodium carbonate and generated inorganic substances. Vacuum distillation was carried out from this oil to obtain 52.1 g of a yellow transparent fraction at 220-225° C. / 0.2-0.3 mmHg. The compound is liquid at room temperature, the yield is 76.7%, and the HPLC purity is 99.0%.

Synthetic example 1-2

[0131] "Synthesis Example 1-2: Synthesis of 2-(2-Hydroxy-4-isobutoxyphenyl)-2H-benzotriazole"

[0132]Synthesis was carried out in the same manner as in Synthesis Example 1, using an equimolar amount of isobutyl bromide instead of 2-ethylhexyl bromide. Yellowish off-white powdery crystals were obtained with a yield of 72.5%. m.p.120.0~120.8°C, λmax=345.6nm, ε=21750.

[0133] The W / O type sunscreens shown in "Table 1-1" were prepared according to conventional methods, and the dyeing properties caused by secondary adhesion were studied.

[0134] [Table 1-1]

[0135]

[0136] *1: 2-[4-(2-Ethylhexyloxy)-2-hydroxyphenyl]-2H-benzotriazole

[0137] [Measurement method of dyeability]

[0138] like figure 1 As shown, apply the sample thickly on the arm, transfer it to the center of the densely woven plain weave (the transfer amount is about 0.06g), leave it indoors for a day, wash it with ordinary laundry detergent, and use a spectrophotometer (Minolta Co., Ltd. ): CM-2002 ma...

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Abstract

Sunscreen cosmetics characterized by containing 4-(1,1- dimethylethyl)-4'-methoxydibenzoylmethane, a benzotriazole derivative represented by the general formula (I), and ethylhexyl 2-cyano-3,3-diphenylacrylate; and sunscreen cosmetics characterized by containing hexyl diethylaminohydroxy- benzoylbenzoate and a benzotriazole derivative represented by the general formula (I): (I) wherein R' is straight-chain C1-6 alkyl; and R'' is straight-chain C1-3 alkyl). The invention aims at providing sunscreen cosmetics which are inhibited from staining clothes owing to secondary adhesion.

Description

technical field [0001] The present invention relates to sunscreen cosmetics. More specifically, it relates to sunscreen cosmetics that prevent staining on clothing due to secondary adhesion. Background technique [0002] The important ultraviolet absorption wavelength regions of sunscreen cosmetics are UV-A region (320-400nm) and UV-B region (290-320nm). Some people think that ultraviolet rays in the UV-A region darken the skin, but they do not cause sunburn and promote skin aging like ultraviolet rays in the UV-B region. [0003] But in recent years, we have gradually learned that the ultraviolet rays in the UV-B area only reach the surface of the skin, while the ultraviolet rays in the UV-A area can reach the deep part of the skin, which not only promotes skin aging but also induces skin cancer. As a result, there is an increasing requirement for sunscreen cosmetics, especially for UV absorption in the UV-A region. [0004] There are many kinds of UV absorbers mixed in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61K8/35A61K8/40A61K8/49A61Q17/04
Inventor 荒木秀文阿部公司矢岛勋鹿子木宏之小口希
Owner SHISEIDO CO LTD
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