JPH0811721B2 - Multi-layered liquid cosmetics - Google Patents

Abstract

PURPOSE:To obtain the titled cosmetic having excellent dryness imparting effects on skin, skin whitening, etc., containing inorganic powder, a water-soluble salt, an alcohol and water, by using spherical secondary particle powder prepared by agglomerating primary particles as the inorganic powder. CONSTITUTION:(A) Inorganic powder consisting of spherical secondary particle powder which is obtained by agglomerating primary particles and has 1-50mum, especially 3-30mum average particle diameter, preferably further 50-200m<2>/g, especially 80-180m<2>/g surface area and 0.01-10cc/g, especially 0.5-5cc/g pore volume is blended with (B) a water-soluble slat, (C) an alcohol and (D) water as essential components in a ratio of 0.5-6wt% component A, 0.02-0.6wt% component B, <=25wt% component C, preferably 2-4wt% component A, 0.2-0.4wt% component B and 10-20wt% component C to give the titled cosmetic suppressing greasiness caused by sweat and sebum, providing skin with excellent dryness and having improved quiet utility of skin whitening.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention provides a comfortable and silky feel to the skin during use,
In addition, the present invention relates to a multi-layered liquid cosmetic composition which is excellent in usability with no noticeable whitening of the skin.

[Prior art]

Conventionally, water-white powder and calamine lotion are well known as two-layer liquid cosmetics containing powder. Usually, the powder layer is precipitated and separated, and shaken when used.
It is used in a uniform dispersion system.

Generally, this type of water-white powder or calamine lotion has powders such as talc, zinc white, titanium dioxide, etc. that can be used for water-white powder or powders such as calamine, as well as water, alcohol, humectant, astringent, etc. as constituent components. It is suitable for summer cosmetics because it gives a refreshing feeling or a refreshing feeling when it is acted on by the action of a large amount of water or alcohol contained in water-white powder or calamine lotion.

However, most of the powders used in these products are plate-shaped or amorphous, and the spreading material on the skin, the adhesiveness, the familiarity, etc. are poor, and even the feeling of use is rough or powdery. There is also a problem in that the skin feels soft and does not have sufficient sweat resistance, and when used on the entire body, the white pigment makes the skin whiter and impairs the aesthetic sense.

In order to improve the above drawbacks, a water-white powder in which an aqueous emulsion of an oily substance is demulsified and coated on the powder has been proposed (JP-A-55-57511). Although this product improves the water resistance and sweat resistance by the action of the oily substance, the content of the oily substance increases, so that it feels oily and a refreshing feel is not obtained and the refreshing feeling disappears. In addition to the drawback that, for example, simply after mixing and stirring the powder and oily substance,
When compounded in an aqueous system, there is a problem in that the oily substance on the powder surface is partially liberated and an oil separation phenomenon occurs.

〔Purpose〕

The present invention has been made to solve the above conventional problems, suppresses stickiness due to sweat and sebum, has almost no roughness or powderiness, and is not conspicuous for skin whitening, usability It is an object of the present invention to provide a multi-layer liquid cosmetic which is excellent in

〔Constitution〕

According to the present invention, a multi-layered liquid cosmetic containing at least an inorganic powder, a water-soluble salt, alcohol and water, wherein the inorganic powder is a spherical secondary particle powder obtained by aggregating primary particles. A multi-layered liquid cosmetic composition is provided.

As a result of intensive studies to solve the problems of the conventional cosmetics, the present inventors have found that when a special spherical secondary particle powder is used as the inorganic powder to be contained in the multilayer liquid cosmetic, Surprisingly, it suppresses stickiness due to sweat and sebum,
The inventors have found that a multi-layered liquid cosmetic composition having almost no roughness or powderiness and excellent usability with no noticeable whitening of the skin can be obtained, and completed the present invention.

That is, the multilayer liquid cosmetic of the present invention contains a special spherical secondary particle powder having excellent lubricity as an inorganic powder.

Inorganic powders that are simply plate-shaped or amorphous primary particles or those that are primary particles even if their shape is spherical have small effect of imparting smoothness to the skin, as is clear from Comparative Examples below. Moreover, not only the whitening of the skin is conspicuous, but also the uniform miscibility during shaking and the separability upon standing are lacking, and the excellent effect of the present invention cannot be expected.

 Hereinafter, the present invention will be described in more detail.

The present invention uses spherical secondary particle powder obtained by aggregating primary particles as the inorganic powder contained in the multilayer liquid cosmetic.

Such secondary particles have, for example, an average particle size of 1 to 100 mμ.
Inorganic powder such as silicic acid anhydride, silicic acid, titanium oxide, zirconium oxide, tantalum oxide, etc. of m can be obtained by agglomerating primary particles of silicic acid anhydride into a spherical shape. It is not a particle, and has at least a strength such that the spherical state is not broken even by rubbing.

The average particle size of the secondary particles used in the present invention is 1 to 50 μm, preferably 3 to 30 μm. When it exceeds 50 μm, the dryness is not sufficiently exerted when applied to the skin, and when it is less than 1 μm, it becomes difficult to separate into a transparent liquid layer and a powder layer when left standing after shaking and use.

Surface area of spherical secondary particles used in the present invention (BET method),
The pore volume and the like are not particularly limited, but in view of the effect expression, the surface area is 50 to 200 m ² / g, preferably 80 to 180 m ² / g, and the pore volume is 0.01 to 10 cc / g, preferably 0.05. ~ 5cc / g
The secondary particles of are preferably used.

In the present invention, the reason why a remarkable effect is obtained when spherical secondary particles are used as the powder is not clear, but the secondary particles are different from the primary particles, and sweat, etc. which emanates from the body through an appropriate void therein It is presumed that the effect of eliminating the sticky feeling and the effect of improving the feeling of dryness will be increased in a recurrent manner due to the efficient dispersal of. In addition, the spherical secondary particles have the effect of less whitening of the skin. The reason for this is currently unknown.

The amount of the spherical powder used in the present invention is 0.5 to 6% by weight, preferably 2 to 4% by weight. This is because when the content is 6% by weight or more, the smoothness can be imparted, but when the whitening of the skin becomes noticeable, the content is less than 0.5% by weight, the sufficient smoothness cannot be imparted.

Specifically, the multilayer liquid cosmetic of the present invention contains the above-mentioned inorganic powder, a water-soluble salt, alcohol and water as main components, and further contains desired auxiliary additives.

The water-soluble salt used in the present invention is a soft flocculant for preventing the powder from being hard when left standing and clumping (caking), or from being unable to be uniformly redispersed during use. For example, sodium chloride and calcium chloride. , Magnesium chloride, magnesium sulfate, alum, sodium carbonate, sodium hydrogen carbonate, potassium hydrogen carbonate and the like.

The amount of the water-soluble salt is 0.02 to 0.6% by weight, preferably 0.2.
~ 0.4% by weight. If less than 0.02% by weight,
After shaking and use, the powder does not clearly separate into a transparent liquid layer and a powder layer upon standing, and the powder easily cakes. Also,
If it exceeds 0.6%, the appearance of the powder layer separated and settled is significantly deteriorated. The alcohol used in the present invention is an aliphatic lower monohydric alcohol such as ethyl alcohol and isopropanol, and the compounding purpose of these is to obtain a more beautiful split layer state, redispersibility, refreshing feeling, antiseptic sterilization in an aqueous layer depending on the system. It is to give an effect.

The blending amount of the alcohol used in the present invention is 25% by weight or less, preferably 10 to 20% by weight. The amount of alcohol
If the amount is more than 25% by weight, it becomes difficult to separate the water layer and the powder layer when left to stand, and the alcohol odor becomes strong, which is not preferable.

In addition to the above-mentioned components, the cosmetics of the present invention may contain well-known and commonly used components such as fragrances, pigments, preservatives, ultraviolet absorbers, anti-inflammatory agents, and medicinal components, if necessary. Further, a liquid polyhydric alcohol as a moisturizing agent such as propylene glycol, 1,3-butylene glycol, glycerin, polyglycerin, or polyethylene glycol can be blended as a conventional component. If necessary, liquid paraffin, squalane, mink oil, jojoba oil, isopropyl myristate, dimethyl polysiloxane, isostearyl alcohol, isostearic acid, etc.
It is also possible to add a conventional cosmetic oil that maintains a liquid state and is not easily miscible with water.

〔effect〕

The multi-layered liquid cosmetic of the present invention contains a special secondary particle powder having excellent lubricity as an inorganic powder, so that stickiness due to sweat or sebum can be suppressed, and further excellent smoothness can be imparted. It has excellent usability with no noticeable whitening of the skin.

〔Example〕

 Hereinafter, the present invention will be described in more detail with reference to Examples.

Examples 1-2, Comparative Examples 1-3 Two-layer type liquid cosmetics having the component compositions shown in Table 1 were prepared, and their physical properties and performances were investigated. The results are shown in Table-1.

The properties and performance tests were made by 6 professional panelists by the following test methods.

[Property]

(1) Homogeneous miscibility during shaking 1 sample composition in a transparent glass bottle (diameter 4 cm, height 13 cm)
00 ml was added, and the mixture was allowed to stand at room temperature for 1 month, and then manually shaken up and down 5 times, and the homogeneity of mixing was evaluated according to the following evaluation criteria.

<Evaluation Criteria> ○: Mix evenly.

Δ: The powder slightly caking or dispersed while agglomerated.

× …… Caking occurs and does not mix uniformly.

(2) Appearance upon standing The sample composition was placed in a transparent glass bottle as in the case of (1) above, manually shaken up and down to uniformly mix and disperse, and then left standing for 1 hour. The appearance was evaluated according to the following evaluation criteria.

<Evaluation Criteria> O: The layers are clearly separated.

B: Separated into two layers, but the water layer and oil layer were cloudy, and the liquid / powder interface was not clear.

×: Does not separate into two layers.

(Performance)

(1) Dryness The sample composition was directly applied to dry skin, and the dryness of the dry skin was evaluated by a sensory test.

〔Evaluation criteria〕

◎: Very good ○: Yes △: Slightly ×: Almost no XX: Rough (2) Degree of whitening The sample composition was directly applied to dry skin, and the degree of whitening of the skin after drying was sensory. It evaluated by the test.

◎: Whiteness is not recognized at all ○: 〃 Almost not recognized △: 〃 Somewhat recognized ×: 〃 Accepted × ×: 〃 Extremely recognized From the above results, the product of the present invention gives a good dry feeling to the skin after use, and also has a small degree of whitening, and also has a good miscibility during shaking and a good appearance when standing. it is obvious.

Examples 3 to 5 and Comparative Examples 4 to 6 Two-layer liquid cosmetics having the components shown in Table 2 were prepared, and their properties and performances were examined in the same manner as in Example 1. The results are shown in Table-2.

From the above results, it is clear that the compounding amount of the spherical powder is preferably 0.5 to 6.0%.

Example 6, Comparative Examples 7 to 9 Two-layer liquid cosmetics having the composition components shown in Table 3 were prepared,
The properties and performances were examined in the same manner as in Example 1. The results are shown in Table-3.

From the above results, it is clear that the product of the present invention maintains good properties and performances even when a well-known and commonly used component such as a polyhydric alcohol as a moisturizer, a fragrance, and a preservative is added.

Example 7, Comparative Examples 10 to 12 A three-layer liquid cosmetic composition having the composition components shown in Table 4 was prepared,
The properties and performances were examined in the same manner as in Example 1. The results are shown in Table-4.

From the above results, it is clear that the product of the present invention maintains good performance and properties even when oil is blended.

Claims (2)

[Claims] 1. A multilayer liquid cosmetic containing at least an inorganic powder, a water-soluble salt, alcohol and water, wherein the inorganic powder is a spherical secondary particle powder obtained by aggregating primary particles. A multi-layered liquid cosmetic composition characterized by: 2. The multi-layered liquid cosmetic composition according to claim 1, wherein the average particle size of the spherical secondary powder is 1 to 50 μm.