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Sunscreen cosmetic composition

A technology of cosmetics and chemical formulas, applied in the direction of cosmetics, skin care preparations, etc., to achieve the effects of improved adhesion, excellent ultraviolet absorption performance, and excellent product stability

Inactive Publication Date: 2008-10-01
SHISEIDO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But still can not be said to fully dissolve the oil

Method used

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Examples

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Embodiment

[0157] The following examples illustrate the present invention more specifically, but the present invention is not limited by these examples.

[0158] [the first invention]

[0159]

Synthetic example 1-1

[0160] "Synthesis Example 1-1: Synthesis of 2-[4-(2-ethylhexyloxy)-2-hydroxyphenyl]-2H-benzotriazole"

[0161] 45.4g (0.2mol) of 6-(2H-benzotriazol-2-yl) resorcinol synthesized according to the conventional method 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 (0.4 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

[0162] "Synthesis Example 1-2: Synthesis of 2-(2-Hydroxy-4-isobutoxyphenyl)-2H-benzotriazole"

[0163] 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.

[0164] Research the oils of following A~E to 2,4-bis[[4-(2-ethylhexyloxy)-2-hydroxyl]phenyl]-6-(4-methoxyphenyl)-1, The solubility of 3,5-triazine, the results are as figure 1 shown.

[0165] A: Isodecyl Benzoate

[0166] B: 2-ethylhexyl benzoate

[0167] C: Ethylhexyl 2-cyano-3,3-diphenylacrylate (octocrylene)

[0168]

[0169] D: 2-[4-(2-Ethylhexyloxy)-2-hydroxyphenyl]-2H-benzotriazole

[0170]

[0171] E: 2-(2-Hydroxy-4-isobutoxyphenyl)-2H-benzotriazole

[0172]

[0173] "Solubility Determination Methods and Conditions"

[0174] 2,4-bis[[4-(2-ethylhexyloxy)-2-hydroxy]phenyl]-6-(4-methoxyphenyl)-...

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Abstract

Disclosed is a sunscreen cosmetic composition characterized by containing 2,4-bis[[4-(2-ethylhexyloxy)-2-hydroxy]phenyl]- 6-(4-methoxyphenyl)-1,3,5-triazine and a specific benzotriazole derivative. Also disclosed is a sunscreen cosmetic composition characterized by containing a specific benzotriazole derivative and a specific alkylaryl 1,3-propanedione silicone derivative. The present invention aims to provide a sunscreen cosmetic composition having excellent UV-A absorbing ability and extremely excellent stability wherein 2,4-bis[[4-(2- ethylhexyloxy)-2-hydroxy]phenyl]-6-(4-methoxyphenyl)-1,3,5-triazine, which has low solubility and is likely to be crystallized, is sufficiently dissolved. The present invention also aims to provide a sunscreen cosmetic composition capable of synergistically improving ultraviolet absorbing ability of a conventional ultraviolet absorbent.

Description

technical field [0001] The present invention relates to sunscreen cosmetics. More specifically, it relates to a sunscreen cosmetic having excellent solubility of a specific powdery solid ultraviolet absorber and particularly excellent absorption in the UV-A region. (first invention) [0002] It also relates to a sunscreen cosmetic that can synergistically increase the absorption properties of the UV-A region and the UV-B region. (second invention) Background technique [0003] 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 (320-400nm) darken the skin, but they do not cause sunburn and promote skin aging like ultraviolet rays in the UV-B region (290-320nm). 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 ca...

Claims

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Application Information

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IPC IPC(8): A61K8/49A61Q17/04A61K8/89
Inventor 阿部公司小口希矢岛勋荒木秀文鹿子木宏之
Owner SHISEIDO CO LTD
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