Oil-in-water emulsified cosmetics

A technology of emulsifying cosmetics and oil-in-water type, which is applied in the direction of cosmetics, cosmetics, cosmetic preparations, etc. It can solve the problems of sticky use feeling, sedimentation, powder aggregation over time, etc., and achieves good water resistance and sweat resistance, high ultraviolet rays Defense effect, effect of suppressing stickiness

Active Publication Date: 2016-08-24
KAO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if a large amount of ultraviolet absorber is added, there will be problems such as discoloration, poor ductility, stickiness, etc.
In addition, if a large amount of metal oxide powder is blended, not only aggregation and precipitation of the powder over time will occur, but also there will be problems of lower stability over time such as viscosity reduction, emulsification separation, precipitation, etc.
If they are used in combination, the above-mentioned problems tend to occur further

Method used

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  • Oil-in-water emulsified cosmetics
  • Oil-in-water emulsified cosmetics
  • Oil-in-water emulsified cosmetics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～21、 comparative example 1～17

[0127] Prepare oil-in-water emulsified cosmetics according to the formulas shown in Tables 1 to 4 in accordance with common methods. Using this emulsified cosmetic, the following (1) UV protection ability durability test, (2) emulsified state test, (3) time-dependent stability test, and (4) usability test were performed. The results are shown together in Tables 1-4.

[0128] (1) UV defense ability (persistence)

[0129] Each sample shown in Tables 1 to 4 is uniformly coated on a quartz glass plate so that it becomes 2 mg / cm 2 , dry naturally for 15 minutes. Thereafter, the quartz glass plate coated with the sample was irradiated with ultraviolet light from a certain distance (10 mm). The transmitted ultraviolet rays at this time were detected at more than 6 positions on the quartz glass plate in the range of 290 to 400 nm with an SPF analyzer (Optometices Co.), and the averaged spectrum was obtained to calculate the SPF value.

[0130] After that, each of the sample-coated...

manufacture example 1

[0171] (Production Example 1 Silicone Surface Treatment Microparticle Zinc Oxide Powder Production)

[0172] After putting 88 parts by mass of microparticle zinc oxide powder (approximately spherical, with an average particle diameter of 0.016 μm) and 12 parts by mass of dimethylpolysiloxane (20cSt, manufactured by Shin-Etsu Chemical Co., Ltd.) into toluene and stirring uniformly, Toluene was removed by heating under reduced pressure. The obtained powder was pulverized with an atomizer. Next, firing treatment was performed at 800° C. in air for 2 hours using a high-temperature heating furnace to obtain a silicone surface-treated fine particle zinc oxide powder.

manufacture example 2

[0173] (Production Example 2 Production of Methylhydropolysiloxane Surface-treated Microparticle Zinc Oxide Powder)

[0174] Prepare a slurry consisting of 93 parts by mass of fine-particle zinc oxide powder (roughly spherical, with an average particle size of 0.02 μm), 7 parts by mass of methylhydrogenpolysiloxane (KF-99P, manufactured by Shin-Etsu Chemical Co., Ltd.), and isopropyl alcohol After fully stirring and pulverizing the material, the solvent was distilled off under reduced pressure, and heat treatment was carried out at 150° C. in air for 4 hours to obtain a methyl hydrogen polysiloxane surface-treated microparticle zinc oxide powder.

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Abstract

The present invention provides an oil-in-water emulsified cosmetic that is excellent in stability over time and has a high UV protection effect. The oil-in-water emulsified cosmetic contains the following components (A) to (D) and satisfies the following conditions (i) and (ii). [Ingredients] (A) a specific solid organic ultraviolet absorber; (B) a liquid oil whose content is not less than 8% by mass and not more than 20% by mass; (C) a polyacrylamide compound; (D) a hydrophobizing treatment Granular metal oxide powder. [Conditions] (i) The total content of (A) component and (D) component ((A) + (D)) is 10% by mass or more relative to the total amount of cosmetics; (ii) (A) component and (D) component The content mass ratio of the total amount ((A)+(D)) to the total amount of liquid oil is 0.6 or more and 2 or less.

Description

technical field [0001] The present invention relates to an oil-in-water emulsified cosmetic having an excellent sunscreen effect. Background technique [0002] In recent years, the importance of sunscreen countermeasures in daily life has been pointed out, and even among cosmetics that have a protective effect against ultraviolet rays, oil-in-water emulsified sunscreen cosmetics that have a refreshing feeling and are easy to use continuously are being developed. [0003] These oil-in-water emulsified cosmetics use ultraviolet absorbers or metal oxide powders such as zinc oxide and titanium oxide in order to enhance the UV protection effect. However, if a large amount of ultraviolet absorber is blended, there are problems such as discoloration, poor ductility, stickiness, and other poor feeling in use. In addition, if a large amount of metal oxide powder is blended, not only aggregation and precipitation of the powder over time will occur, but also there will be problems of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61K8/06A61K8/27A61K8/29A61K8/41A61K8/49A61K8/81A61Q1/00A61Q17/04
CPCA61K8/0241A61K8/062A61K8/34A61K8/37A61K8/375A61K8/41A61K8/411A61K8/415A61K8/4946A61K8/4966A61K8/585A61K8/8158A61K8/891A61K2800/5922A61K2800/614A61Q17/04A61K8/27A61K8/29A61K8/342A61Q1/02A61Q5/02A61Q15/00A61Q19/10
Inventor 小田岛秀树
Owner KAO CORP
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