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Flaky particle and cosmetic

a technology of flaky particles and cosmetics, applied in the direction of biocide, silicon compounds, silicates, etc., can solve the problems of insufficient, difficult to increase the formulation amount of boron nitride in cosmetic compositions, and lack of flaky particles suitable for cosmetic compositions providing high transparency, etc., to achieve excellent smoothness and high ability to give skin a natural tone.

Inactive Publication Date: 2010-04-22
SAKAI CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a flaky particulate material that is smooth and has a natural tone, and a cosmetic composition containing it. The flaky particulate material has a high reflection-intensity ratio (° / 45°) of not less than 0.30, which gives skin a low-glossy, matt appearance. It also has an average coefficient of friction of not more than 0.50, which ensures smoothness and a comfortable use experience. The material is made of a base particle made of mica, synthetic mica, sericite, talc, barium sulfate, or aluminum oxide, and a fatty acid metal salt deposited on the substrate particle by surface treatment. The material has excellent smoothness and transparency, and can provide a natural cosmetic finish with high reflection-intensity ratio (° / 45°) of not less than 0.30.

Problems solved by technology

Thus, the boron nitride has a defect that it looks whitish on skin upon use.
For giving skin a natural tone, it is difficult to increase a formulation amount of boron nitride in cosmetic compositions.
That is, no flaky particulate material suitable for a cosmetic composition providing high transparency, and sufficient smoothness comparable to boron nitride, has been known yet in the art.
However, such a surface-treatment is unsuccessful to improve transparency of boron nitride particles, and thus, cannot produce a flaky particulate material with both sufficient transparency and smoothness.
Thus, no report specialized in an improvement of smoothness has been found yet in the art.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0058]In 2 liters of ion-exchanged water, 100 g of lamellar barium sulfate.H (average coefficient of friction: 0.61; a product of Sakai Chemical Industry Co., Ltd) was suspended to prepare a suspension. A solution of 7.1 g of magnesium chloride hexahydrate in 50 mL of ion-exchanged water was added to the suspension, and then a 1-mass % aqueous NaOH solution was added over 30 minutes so that the pH of the mixture should be within 10 to 11. The mixture was heated to 70° C., and then a solution of 5.8 g of coconut oil fatty acid potassium salt in 50 mL of ion-exchanged water was added over 30 minutes. After completion of addition, the mixture was aged for 30 minutes, and adjusted the pH of the mixture to be within 7 to 8 with a 1-mass % aqueous sulfuric acid solution. The mixture was filtered. The solid matter filtered was washed with water (until the conductivity of washed liquid be 0.1 mS / cm or lower), and then dried, to give a flaky particulate material. Thus-obtained flaky particul...

example 2

[0059]In 2 liters of ion-exchanged water, 100 g of lamellar barium sulfate.H (average coefficient of friction: 0.61) was suspended to prepare a suspension. A solution of 4.9 g of calcium chloride dihydrate in 50 mL of ion-exchanged water was added to the suspension, and then a 1-mass % aqueous NaOH solution was added over 30 minutes so that the pH of the mixture should be within 10 to 11. The mixture was heated to 70° C., and then a solution of 5.9 g of potassium myristate in 50 mL of ion-exchanged water was added over 30 minutes. After completion of addition, the mixture was aged for 30 minutes, and adjusted the pH of the mixture to be within 7 to 8 with a 1-mass % aqueous sulfuric acid solution. The mixture was filtered. The solid matter filtered was washed with water (until the conductivity of washed liquid be 0.1 mS / cm or lower), and then dried, to give a flaky particulate material. Thus-obtained flaky particulate material had an average length of the major axis of 7.0 μm, the r...

example 3

[0060]In 2 liters of ion-exchanged water, 100 g of lamellar barium sulfate.H (average coefficient of friction: 0.61) was suspended to prepare a suspension. A solution of 3.3 g of calcium chloride dihydrate in 50 mL of ion-exchanged water was added to the suspension, and then a 1-mass % aqueous NaOH solution was added over 30 minutes so that the pH of the mixture should be within 10 to 11. The mixture was heated to 70° C., and then a solution of 4.4 g of potassium palmitate in 50 mL of ion-exchanged water was added over 30 minutes. After completion of addition, the mixture was aged for 30 minutes, and adjusted the pH of the mixture to be within 7 to 8 with a 1-mass % aqueous sulfuric acid solution. The mixture was filtered. The solid matter filtered was washed with water (until the conductivity of washed liquid be 0.1 mS / cm or lower), and then dried, to give a flaky particulate material. Thus-obtained flaky particulate material had an average length of the major axis of 7.7 μm, the r...

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Abstract

The present invention has an object to provide a flaky particulate material giving skin an excellent smoothness, which is free from whitening problem upon use thereof owing to its high transparency. The present invention also has another object to provide a cosmetic composition containing the flaky particulate material. The present invention relates to flaky particulate material, which has an average coefficient of friction is not more than 0.50, and a total light transmittance is not less than 85%. A particle in the flaky particulate material comprises a substrate particle made of one material selected from the group consisting of mica, a synthetic mica, sericite, talc, barium sulfate and aluminum oxide. The present invention provides a flaky particulate material that gives skin excellent smoothness, a natural tone, and a matt appearance. The flaky particulate material of the present invention gives a cosmetic composition which provides great comfort of use, and an excellent appearance.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to a flaky particulate material and a cosmetic composition.[0002]Flaky particles are excellent in adhesion to skin, and also excellent in smoothness owing to their shapes. Thus, such flaky particles can provide great comfort of use, and therefore, are widely used in makeup cosmetics.[0003]A variety of flaky particulate materials are known as such flaky particles. Among them, particulate materials with a small coefficient of friction provides excellent smoothness, and thus, a cosmetic composition that provides great comfort of use can be obtained from such flaky particulate materials. A flaky particulate material with a particularly small coefficient of friction is, for example, boron nitride, which is mentioned in Patent Document 1.[0004]Boron nitride has indeed good smoothness, but it is somewhat whitish. Thus, the boron nitride has a defect that it looks whitish on skin upon use. For giving skin a natural tone, it is d...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61K8/25A61K8/26A61K8/23C01B33/26C01B33/24C01F11/46C01F7/02
CPCA61K2800/412A61Q1/02C01P2004/20C01P2004/54C01P2004/61C09C1/027A61K8/26C09C1/405C09C1/407C09C3/08A61K8/02A61K8/19A61K8/25C09C1/28A61K8/23C09C1/02C09C1/40
Inventor ONO, KEIJIASHIDA, TAKUROIZUMIKAWA, HIROYUKIYOSHIDA, HIROBUMI
Owner SAKAI CHEM IND CO LTD
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