JPH06157264A - Skin cosmetic - Google Patents

Abstract

PURPOSE:To obtain a skin cosmetic, comprising fine particulate titanium oxide and hexametaphosphoric acid, excellent in protecting action on ultraviolet rays and excellent in organoleptic characteristics without whitening. CONSTITUTION:This skin cosmetic is obtained by including 0.05-20wt.% fine particulate titanium oxide having 5-100nm average particle diameter and 0.0001-1wt.% hexametaphosphoric acid or its salt as active ingredients. The blending ratio of the fine particulate titanium oxide to the hexametaphosphoric acid or its salt is (1:1) to (200000:1). A coloring matter, a perfume, a preservative, an ultraviolet ray absorber, an antioxidant, a pigment, etc., is suitably blended in addition to the essential ingredients to prepare the cosmetic, which can be prepared in a dosage form such as a cream, a milky lotion, toilet water or an emulsified type foundation. For example, in the case of the milky lotion, etc., the fine particulate titanium oxide is dispersed in water or a liquid oily ingredient and the resultant dispersion is added in the course of production to provide the milky lotion.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention has an average particle size of 5 to 100.
nm fine particle titanium oxide and hexametaphosphoric acid or their salts enhance the dispersibility and anti-aggregation effect of the fine particle titanium oxide. It also relates to a skin cosmetic having excellent feeling.

[0002]

2. Description of the Related Art In recent years, attention has been paid to the harmful effects of ultraviolet rays on the skin, and many cosmetics for the purpose of preventing ultraviolet rays have been developed. In these cosmetics, fine particle titanium oxide is widely blended because it has an ultraviolet absorbing ability and an ultraviolet blocking ability. Fine-grained titanium oxide enhances dispersibility in a product and prevents reaggregation thereof, whereby a high anti-UV effect and excellent organoleptic properties can be obtained. However, it is difficult to disperse the fine particle titanium oxide close to its primary particle diameter and to maintain high dispersibility in the product.
There was a problem that sufficient UV protection was not obtained, whitening occurred when applied to the skin, and there was a problem in the sensory aspect in use.

The inventors of the present invention have made earnest studies in view of such circumstances, and as a result, the skin cosmetics described below can enhance the dispersibility and aggregation preventive effect of particulate titanium oxide, and as a result, have a high UV protection ability. It has been found that it has no whitening when applied to the skin, and is excellent in sensory aspect in use, and has completed the present invention.

[0004] That is, the object of the present invention is to obtain a high ultraviolet protection ability, which is obtained by enhancing the dispersibility and agglomeration preventing effect of fine particle titanium oxide, does not whiten when applied to the skin, and has sensory characteristics in use Is to provide excellent skin cosmetics.

[0005]

Means for Solving the Problems The present invention which achieves the above object is a skin cosmetic which comprises fine particle titanium oxide having an average particle diameter of 5 to 100 nm and hexametaphosphoric acid or a salt thereof.

The structure of the present invention will be described in detail below. The fine particle titanium oxide used in the present invention is rutile type or anatase type titanium dioxide obtained by a general production method, and the particle size thereof is preferably 5 to 100 nm,
More preferably, it is 10 to 70 nm. These fine particle titanium oxides may be mixed or surface-coated with an element selected from alumina, zirconia and iron in a range of 10% by weight or less based on the whole. Further, a surface treatment such as a silicone treatment or a coupling agent may be post-treated.

The amount of fine particle titanium oxide to be incorporated in the cosmetic is preferably 0.05 to 20.0% by weight, more preferably 0.5 to 10.0% by weight, based on the total amount of the cosmetic. 0.05
If it is less than%, a sufficient UV protection effect cannot be obtained and it is 20.0.
When it exceeds%, the storage stability and the sensory characteristics are deteriorated, which is not preferable.

Examples of hexametaphosphoric acid used in the present invention include hexametaphosphoric acid, hexametaphosphoric acid sodium salt, potassium salt, calcium salt, magnesium salt and the like. The blending amount thereof is preferably 0.0001 to 1.0% by weight, and more preferably 0.01 to 0.3% by weight based on the total amount of the cosmetic. If it is less than 0.0001%, sufficient dispersibility and anti-aggregation effect cannot be obtained, and 1.0
If it exceeds the weight%, the dispersibility and the effect of preventing aggregation are reduced.

The compounding ratio of fine particle titanium oxide and hexametaphosphoric acid or hexametaphosphate is 1: 1 to 20000.
0: 1 is preferable, and 40: 1 to 100 is more preferable.
It is 0: 1.

The skin cosmetic of the present invention contains, in addition to the above-mentioned essential components, pigments, fragrances, preservatives, ultraviolet absorbers, antioxidants,
A pigment and the like can be appropriately added within the range where the object of the present invention is achieved.

As the dosage form of the cosmetic of the present invention, cream,
Examples include emulsions, lotions, and emulsion foundations. In the case of an emulsion or the like, this cosmetic is produced by dispersing fine particle titanium oxide in water or a liquid oil component and adding this in the middle.

[0012]

EXAMPLES The present invention will be described in detail below based on examples and comparative examples. In addition,% shown in the examples is% by weight. The method for measuring the particle size of the fine titanium oxide particles, the method for evaluating the ultraviolet protection ability, and the sensory test described in the examples are as follows.

(1) Method for measuring particle size of fine particle titanium oxide A sample is diluted about 1000 times and a particle size distribution meter (BI-90) is used.
PARTICLE SIZER, Brookhaven
INSTRUMENTS CORPOR-ATION
(Manufactured by the company). Measurements were made immediately after sample preparation and 45
It was carried out after storage for 3 months in a constant temperature bath at ℃.

(2) Evaluation method of ultraviolet protection ability A sample of 6 mg was applied to a quartz glass plate (50 × 50 × 2 mm), and scissors, a spectrophotometer (MPS-2000,
(Manufactured by Shimadzu) was used to measure the absorbance in the wavelength range of 200 to 500 nm. The UV protection ability was compared by the absorbance at 300 nm.

(3) Sensory test Twenty testers used the sample continuously for 10 days and evaluated the characteristics of the sample. The test result is "not whitened when applied to the skin", with respect to the test items of feeling of use and UV protection effect,
The number of respondents who answered "I felt a UV protection effect".

Examples 1 to 4 and Comparative Examples 1 to 4 Fine particle titanium oxide having an average particle diameter of 5 to 100 nm and hexametaphosphoric acid or hexametaphosphate are mixed in the composition shown in Table 1 to prepare an emulsion based on the following preparation method. did.

Composition

[Table 1]

[0018]

[Table 2]

Preparation methods (B) and (C) are uniformly dissolved at 80 ° C.,
It is prepared by injecting (B) into (C) while stirring (C), emulsifying and dispersing, and then adding (A) previously dispersed by a homomixer, and cooling to 30 ° C. with stirring. . The various tests described above were carried out for each, and the results are shown in Table 3.

[0020]

[Table 3]

Characteristic The emulsions of Examples 1 to 4 of the present invention showed remarkable effects in various characteristics. On the other hand, the emulsions of Comparative Examples 1 to 4 were inferior in various properties as compared with the examples of the present invention.

Example 5 Foundation A foundation of the present invention having the composition shown in Table 4 was prepared by the following production method.

Composition

[Table 4]

Preparation methods (B) and (C) were uniformly dissolved at 80 ° C.,
It is prepared by injecting (B) into (C) while stirring (C), emulsifying and dispersing, and then adding (A) previously dispersed by a homomixer, and cooling to 30 ° C. with stirring. .

Properties The foundation of this Example 5 showed good results in all the above tests.

Example 5 Lotion A lotion of the present invention having the composition shown in Table 5 was prepared by the following production method.

Composition

[Table 5]

Preparation method (A) is mixed and dispersed by a homomixer to prepare.

Properties The lotion of this Example 6 showed good results in all the above tests.

[0030]

Industrial Applicability As described above, it is apparent that the present invention provides a skin cosmetic which has an excellent UV protection ability, does not whiten, and has excellent sensory properties.

Claims (1)

[Claims] 1. A skin cosmetic material comprising fine titanium oxide particles having an average particle diameter of 5 to 100 nm and hexametaphosphoric acid or a salt thereof.