JPH1135440A - Cosmetic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject cosmetic which possesses the ability of blocking ultraviolet rays and the excellent dispersion and gives natural finish and high transparent touch by formulating fine-grain titanium oxide having a specific grain shape and average grain size with a specific size of flaky zinc oxide. SOLUTION: The objective cosmetic is obtained by formulating (A) preferably 1-30 wt.% of fine-grain titanium oxide which shows a spindle or needle grain shape and possesses the minor axis of 0.005-0.1 μm and the major axis of 0.01-0.5 μm with (B) preferably l-30 wt.% of flaky zinc oxide which possesses an average grain size of 0.1-30 μm, an average grain thickness of 0.01-0.5 μm and an aspect ratio of 3 or more. When necessary, this cosmetic can be formulated with, for example, organic powders, e.g. talc, kaolin, etc., and oils and fats, e.g. olive oil, castor oil, etc. Further, as the dosage form of the cosmetic, powder, oil-in water type emulsion, lotion and paste are illustrated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cosmetic containing fine particle titanium oxide having a specific particle shape and an average particle diameter, and a flaky zinc oxide having a specific size. Good stretch and spread, UV-A and UV-
The present invention relates to a cosmetic that has an ability to block ultraviolet rays in a wide region of region B, has excellent dispersibility, and has a natural finish, that is, has no bluish whiteness and high transparency.

[0002]

2. Description of the Related Art Conventionally, in order to impart an ultraviolet ray blocking effect to cosmetics, an organic ultraviolet ray absorbing agent, titanium oxide,
There has been a technique of blending a powder in which inorganic compounds such as zinc oxide, cerium oxide, and zirconium oxide are finely divided.

[0003]

The compounding of an organic ultraviolet absorber remarkably improves the effect of blocking ultraviolet rays, but the addition of a large amount is not preferred because stickiness and irritation to the skin are caused. In addition, although particulate titanium oxide has a high ultraviolet blocking ability, if it is blended in a large amount, the dispersibility is unstable depending on the shape, so the spreadability is poor in usability, and the bluish white peculiar to the particulate titanium oxide appears and the composition The objects and coatings were pale and unnatural. To resolve these drawbacks, acicular fine particle titanium oxide has been used.
The blocking ability in the UV-B region (290 to 320 nm) is high, but the blocking ability in the UV-A region (320 to 400 nm) is not so high. Also, UV
Fine particle powder of zinc oxide has been used to improve the ultraviolet blocking effect in the -A region, but when it is blended in a large amount, defects such as lack of smoothness and poor spread are similar to fine particle titanium oxide. Had. Therefore, it has been desired to develop a cosmetic composition having an effect of blocking ultraviolet rays in a wide range, having good dispersibility, good spreadability and a natural finish.

[0004]

In view of such circumstances, the present inventors have conducted intensive studies and as a result, have found that a fine particle titanium oxide having a specific particle shape and an average particle diameter and a flaky oxide having a specific size are obtained. It has been found that by containing zinc, a cosmetic having an ultraviolet blocking effect over a wide range, good dispersibility, good spreadability and a natural finish can be obtained, and completed the present invention. That is, in the present invention, the particle shape is a spindle shape or a needle shape, and the minor axis is 0.00
5 to 0.1 μm, a fine particle titanium oxide having a major axis of 0.01 to 0.5 μm, an average particle diameter of 0.1 to 30 μm, an average particle thickness of 0.01 to 0.5 μm, and an aspect ratio of 3 Another object of the present invention is to provide an ultraviolet protection cosmetic comprising the above flaky zinc oxide.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
The component (A) used in the present invention is a fine particle titanium oxide having a spindle shape or a needle shape, a minor axis of 0.005 to 0.1 μm, and a major axis of 0.01 to 0.5 μm. Has a minor axis of 0.005 to 0.02 μm and a major axis of 0.0
It is a fine particle titanium oxide of 1 to 0.2 μm. If the minor axis and the major axis are too small, the powder will agglomerate to deteriorate the UV protection effect and usability. If it is too large, the transparency will be impaired, and the UV protection effect will also deteriorate, which is not good. (A) Component fine particle titanium oxide, if necessary,
Those having different particle shapes and particle diameters can also be used in combination.For example, metal oxides, metal hydroxides, fluorine compounds, silicone oils, metal soaps, waxes, oils and fats, hydrocarbons, etc. It is also possible to use one or more of them after processing.

[0006] The amount of the component (A) of the present invention to be incorporated into the cosmetic is not particularly limited, but is preferably 1 to 30% by weight (hereinafter simply referred to as "%") in terms of the ultraviolet protection effect and usability. More preferred.

The flaky zinc oxide (B) used in the present invention has an average particle diameter of 0.1 to 30 μm, an average particle thickness of 0.01 to 0.5 μm, and an aspect ratio of 3 or more. Zinc oxide, preferably having an average particle size of 0.1
10 to 10 μm, the average particle thickness is 0.01 to 0.5 μm,
In addition, the aspect ratio is 5 to 300. If the average particle size is smaller than this range, the specific surface area of the powder increases, and the
Adhesive force is increased, and if it is large, it is not good because it causes a sense of incongruity when applied. When the average particle thickness is smaller than this range, the ultraviolet ray blocking effect is improved, but the particles are easily crushed in the process of blending into the cosmetic, which is not preferable. If the average particle thickness is larger than this, visible light is easily reflected, which causes excessive whiteness. Further, when the aspect ratio is smaller than this range, smoothness and sliding feeling at the time of application are lost, which is not good. Further, the flaky zinc oxide of the component (B) may be used in combination with those having different average particle thicknesses, average particle diameters and aspect ratios, if necessary.
Depending on the purpose, for example, it is also possible to use after treating with one or more of metal oxides, fluorine compounds, silicone oils, metal soaps, waxes, oils, hydrocarbons and the like. The blending amount of the component (B) of the present invention is not particularly limited, but is more preferably 1 to 30% in terms of ultraviolet protection effect and usability.

[0008] The cosmetics of the present invention may optionally contain components normally used in cosmetics, if necessary. As the powder, for example, talc, kaolin, sericite, mica, magnesium carbonate, calcium carbonate, aluminum silicate, magnesium silicate, aluminum magnesium silicate, calcium silicate, inorganic fillers such as silicic anhydride, red iron oxide, Yellow iron oxide, black iron oxide, Gunjou,
Inorganic coloring pigments such as konjo, carbon black, etc., pearlescent agents such as titanium mica, iron oxide mica titanium, bismuth oxychloride, etc., organic coloring pigments such as tar pigments, natural pigments, nylon powder, silicone resin powder, silk powder, polystyrene, Organic powders such as polyethylene powder, crystalline cellulose, N-acyl lysine and the like can be mentioned.
In addition, these powders are compounded, fluorine compounds, silicone compounds, metal soaps, waxes, fats and oils,
Surface treatment may be performed using one or more kinds of hydrocarbons or the like. In addition, pigment-grade titanium oxide, fine-particle titanium oxide, and zinc oxide having various average particle diameters, particle size distributions, and shapes other than those described above can be used in combination within a range that does not impair the effects of the present invention. Examples of oils include olive oil, castor oil, jojoba oil,
Fats such as mink oil, waxes such as beeswax, lanolin, candelilla wax, liquid paraffin, squalane, hydrocarbons such as petrolatum, paraffin wax, microcrystalline wax, fatty acids such as stearic acid and oleic acid, cetanol, stearyl alcohol , Higher alcohols such as behenyl alcohol, esters such as isopropyl myristate, glyceryl trioctanoate, and diglyceryl triisostearate; lanolin derivatives such as lanolin fatty acid isopropyl and lanolin alcohol; silicone oils such as dimethylpolysiloxane and methylphenylpolysiloxane; Oxyalkylene-modified or alkyl-modified silicone oils, and fluorine-based oils such as perfluorodecane and perfluorooctane can be exemplified.
Other examples include organic solvents, resins, plasticizers, ultraviolet absorbers, antioxidants, preservatives, surfactants, humectants, fragrances, water, alcohol, and thickeners.

The cosmetics of the present invention include skin care cosmetics, makeup cosmetics, hair cosmetics and the like. Also,
The dosage form of the present invention includes powders, powder solids, oil-in-water emulsions, water-in-oil emulsions, lotions, oily solids, oily liquids, pastes, multilayers, gels and the like. Can be Among them, the makeup cosmetics include foundation, white powder, makeup base, blusher, lipstick, concealer, nail polish, eye products, sunscreen cosmetics and the like.

[0010]

EXAMPLES The present invention will be further described with reference to the following examples, but the present invention is not limited thereto.

Examples 1 to 5 and Comparative Examples 1 to 5 W / O sunscreen cosmetics W / O sunscreen cosmetics having the compositions shown in Table 1 were prepared.
Usability (expansion / expansion) and natural finish were evaluated by sensory evaluation, and transmittance of ultraviolet rays was determined by measuring transmittance. Table 1 also shows the results.

[0012]

[Table 1]

Note 1: Minor diameter 0.01 μm, Long diameter 0.1 μm Note 2: Average particle diameter 4.5 μm, Average particle thickness 0.25 μ
m, aspect ratio 19 * 3: Granular fine particle titanium oxide having an average particle diameter of 0.03 μm * 4: Granular fine particle zinc oxide having an average particle diameter of 0.04 μm

(Production method) A: Components (1) to (5) are mixed and dispersed. B: Components (6) to (11) are mixed and dispersed. C: A and B are mixed and emulsified.

(Evaluation method) Evaluation items: Nobi ・ Hirari 2. 2. Natural finish UV blocking effect (UVA, UVB)

Evaluation and Evaluation Criteria: Evaluation items 1 and 2 were subjected to a use test by 16 specialized panels, and were judged according to the following criteria based on the average score of the five-grade evaluation. Evaluation criteria 5 points: Very good 4 points: Good 3 points: Normal 2 points: Somewhat poor 1 point: Poor Judgment criteria ：: 4.0 points or more ○: 3.0 points or more and less than 4.0 points △: 2. 0 or more and less than 3.0 points ×: less than 2.0 points

Regarding the ultraviolet ray blocking effect of evaluation item 3,
Each sample was uniformly applied on a quartz plate using a doctor blade to obtain a sample for measurement. UV of the above sample with a spectrophotometer
320-400 nm as A, 290-3 as UVB
The transmittance at each wavelength of 20 nm was measured and determined according to the following criteria.

As is clear from the results shown in Table 1, Example 1
The W / O type sunscreen cosmetics of Nos. To 5 were excellent compared with Comparative Examples 1 to 5, satisfying all of the requirements of spreading and expanding, natural finish, and ultraviolet blocking effect (UVA, UVB).

[0019] Note 5: Methyl hydrogen polysiloxane 2% treated material (minor diameter 0.01 μm, major diameter 0.1 μm) Note 6: Methyl hydrogen polysiloxane 2% treated material (average particle diameter 4.5 μm, average particle thickness 0.25 μm) ,
Aspect ratio 19)

(Production method) A: Components (1) to (5) are mixed. B: Components (6) to (10) are mixed. C: A and B are mixed and dispersed and filled in a gold plate. The sunscreen powder foundation of the present invention was excellent in spreading and spreading, natural finish and ultraviolet blocking effect.

[0021] Note 7: Minor axis 0.015 μm, major axis 0.075 μm

(Preparation method) A: Components (1) to (6) are heated and dissolved at 110 to 120 ° C. B: Add components (7) to (11) to A and mix uniformly. C: B was poured into a mold and cooled and solidified to produce a lipstick. The lipstick of the present invention was excellent in spreading and spreading, natural finish, and ultraviolet blocking effect.

[0023]

The cosmetic composition of the present invention contains fine titanium oxide particles having a specific particle shape and an average particle diameter and flaky zinc oxide particles of a specific size, so that they can spread and spread on the skin. Sex, natural finish (no paleness),
It is very excellent in the effect of blocking ultraviolet light in a wide range.

Claims (2)

[Claims] (1) The following components (A) and (B): (A) a particle shape of a spindle or needle and a minor axis of 0.0
(B) The average particle diameter is 0.1 to 30 μm, the average particle thickness is 0.01 to 0.5 μm, and the aspect ratio is 0.5 to 0.1 μm and the major axis is 0.01 to 0.5 μm. A cosmetic comprising three or more flaky zinc oxides. 2. The cosmetic according to claim 1, comprising 1 to 30% by weight of the component (A) and 1 to 30% by weight of the component (B).