JPS63145212A - Multi-layer type liquid cosmetic - 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 The present invention relates to a multilayer liquid cosmetic that provides a pleasant and smooth feeling to the skin during use and 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. These usually have a powder layer separated by precipitation, and are used in a uniformly dispersed system by shaking at the time of use.

Generally, this type of water white powder or calamine lotion is
In addition to powders such as talc, zinc white, titanium dioxide, etc. that can be used for water white powder, or powders such as calamine, water, alcohol, humectants, astringents, etc. are the constituent ingredients, and water white powder or calamine lotion is used. It is suitable as a summer cosmetic because it gives a refreshing and refreshing feeling upon use due to the action of the large amount of water or alcohol contained therein.

However, most of the powders used in these products are plate-shaped or amorphous, which have poor spreadability, adhesion, and conformability to the skin, and the feeling of use is rough and powdery. It feels bulky and does not have sufficient sweat resistance, and when used all over the body, the white pigment causes the skin to become white, impairing its aesthetic appearance.

In order to improve the above-mentioned drawbacks, a water white powder has been proposed in which a water-based emulsion of an oil-based substance is demulsified and coated on a powder (
(Japanese Patent Application Laid-open No. 55-57511). This product has improved water resistance and sweat resistance due to the action of oily substances, but because of the increased content of oily substances, it feels oily and does not have a light feel and does not have a refreshing feeling. In addition to the disadvantage that it disappears, for example, if the powder and oily substance are simply mixed and stirred and then blended into an aqueous system, the oily substance on the surface of the powder is partially liberated, causing an oil separation phenomenon. have.

〔the purpose〕

The present invention was made to solve the above-mentioned conventional problems, and suppresses stickiness caused by sweat and sebum, and has almost no roughness or powderiness.

Moreover, it is an object of the present invention to provide a multilayer liquid cosmetic that does not cause noticeable skin whitening and is excellent in usability.

〔composition〕

According to the present invention, there is provided 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 agglomerating primary particles. A multilayer liquid cosmetic is provided.

As a result of intensive research to solve the problems of the conventional cosmetics mentioned above, the present inventors found that when a special spherical secondary particle powder was used as an inorganic powder to be included in a multilayer liquid cosmetic, an unexpected result was discovered. The present invention was completed based on the discovery that it is possible to obtain a multilayer liquid cosmetic that suppresses stickiness caused by sweat and sebum, has almost no roughness or powderiness, and is easy to use and does not cause noticeable whitening of the skin. I came to the conclusion.

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

If the inorganic powder is simply a plate-shaped or amorphous primary particle, or if the inorganic powder is a spherical primary particle, the effect of imparting smoothness to the skin is small, as is clear from the comparative example below. Moreover, not only does it cause noticeable whitening of the skin, but it also lacks uniform miscibility when shaken and separability when left to stand, making it impossible to expect the excellent effects of the present invention.

The present invention will be explained in more detail below.

The present invention uses spherical secondary particles obtained by agglomerating primary particles as an inorganic powder to be contained in a multilayer liquid cosmetic.

Such secondary particles have an average particle diameter of 1 to 50 μm, for example.
Inorganic powders such as silicic anhydride, silicic acid, titanium oxide, zirconium oxide, and tantalum oxide can be obtained by agglomerating primary particles of silicic anhydride into spherical shapes, but the ones used in the present invention are not simply agglomerated particles. It has at least enough strength that the spherical state will not be destroyed even if it is rubbed.

The average particle diameter of the secondary particles used in the present invention is 1 to 50 μm, preferably 3 to 30 μm. If it exceeds 50 μm, the smoothness will not be sufficiently exhibited when applied to the skin, and if it is less than 1 μm, it will be difficult to shake. and after using.

When left standing, it becomes difficult to separate into a transparent liquid layer and a powder layer.

Surface area of spherical secondary particles used in the present invention (BET method),
There are no particular restrictions on the pore volume, but in terms of the ability to express the effect, the surface area should be 50 to 200 rrr/g, preferably 80 rrr/g.
~180m/g, and pore volume is 0.01~10cc
/g, preferably 0.5 to 5 cc/g of secondary particles are suitably used.

In the present invention, it is not clear why the use of spherical secondary particles as powder produces a remarkable effect, but unlike primary particles, secondary particles emit sweat from the body through appropriate voids inside. is dissipated efficiently, so it is estimated that the effect of eliminating the sticky feeling and the effect of improving the dry feeling are mutually increased. Furthermore, the results showed that these spherical secondary particles caused less whitening of the skin. The reason for this is currently unclear.

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

Specifically, the multilayer liquid cosmetic composition of the present invention mainly contains the above-mentioned inorganic powder, water-soluble salt, alcohol, and water, and further includes desired auxiliary additive components.

The water-soluble salt used in the present invention is a soft flocculant that prevents the powder from becoming hard and agglomerating (caking) when left still, and from being unable to be uniformly redispersed during use, such as sodium chloride, calcium chloride, etc. , magnesium chloride, magnesium sulfate, alum, sodium carbonate, sodium hydrogen carbonate, potassium hydrogen carbonate, and the like.

The content of the water-soluble salt is 0.02 to 0.6% by weight, preferably 0.2 to 0.4% by weight2. If it is less than 0.02% by weight, it will not clearly separate into a transparent liquid layer and a powder layer when it is shaken and left to stand after use, and furthermore, the powder will be prone to caking. Moreover, when the amount exceeds 0.6%, the appearance of the separated and settled powder layer becomes significantly worse. The alcohol used in the present invention is an aliphatic lower-hydric alcohol such as ethyl alcohol and isopropanol, and the purpose of blending these is to create a more beautiful separated layer state, redispersibility, cooling sensation,
6. The amount of alcohol used in the present invention is 25% by weight or less, preferably 10 to 20% by weight, to impart a preservative and sterilizing effect in the aqueous layer. If the alcohol content is more than 25% by weight, it will be difficult to separate the water layer and powder layer when left to stand, and the alcohol odor will also become stronger.
Undesirable.

In addition to the above-mentioned ingredients, the cosmetic of the present invention may contain well-known and commonly used ingredients such as fragrances, pigments, preservatives, ultraviolet absorbers, anti-inflammatory agents, medicinal ingredients, etc., if necessary. Also,
Liquid polyhydric alcohols as humectants such as propylene glycol, 1,3-butylene glycol, glycerin, polyglycerin, and polyethylene glycol can also be blended as conventional ingredients. In addition, liquid paraffin, squalane, mink oil, jojoba oil, isopropyl myristate, dimethylpolysiloxane, isostearyl alcohol, isostearic acid, etc. can be added at 5°C to 25°C as necessary.
It is also possible to incorporate commonly used cosmetic oils that maintain a liquid state and are not easily miscible with water.

〔effect〕

The multi-layered liquid cosmetic of the present invention contains special spherical secondary particle powder with excellent smoothness as an inorganic powder, so it suppresses stickiness caused by sweat and sebum and provides excellent smoothness for the skin. It has excellent usability and does not cause noticeable skin whitening.

〔Example〕

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

Examples 1-2, Comparative Examples 1-3 A two-layer liquid cosmetic having the ingredient composition shown in Table 1 was prepared,
Its properties and performance were investigated. The results are shown in Table-1.

The property and performance tests were conducted by six expert panelists using the following test methods.

[Sexual condition]

(1) Uniform miscibility during shaking The sample composition was placed in a transparent glass bottle (diameter 4 cm, height 13 cm).
), and after standing at room temperature for one month, it was manually shaken up and down five times, and the uniform miscibility at that time was evaluated according to the following evaluation criteria.

<Evaluation criteria> O: Mix uniformly.

Δ: Powder may cause caking or be dispersed while remaining agglomerated.

×: Caking occurs and the mixture is not uniformly mixed L'5 (2) Appearance when standing Place the sample composition into a transparent glass bottle as in the case of (1) above, and manually shake it up and down. After uniformly mixing and dispersing, the mixture was allowed to stand for 1 hour and its appearance was evaluated according to the following evaluation criteria.

Evaluation criteria 0: Clearly separated into two layers.

Δ: Separated into two layers, but the water layer and oil layer are cloudy, and the interface between the liquid and powder is not clear.

×...Does not separate into two layers.

[Sexual ability]

(1) Free-flowing property The sample composition was applied directly to dry skin, and after drying, the free-flowing property of the skin was evaluated by a sensory test.

〔Evaluation criteria〕

◎ : Very much O : Yes Δ : Somewhat × : Not at all × The degree was evaluated by a sensory test.

◎: Whiteness is not observed at all o: tr is hardly observed △: Slightly observed From these results, it is clear that the product of the present invention gives a good smooth feeling to the skin after use, has a low degree of whitening, and also has good uniform miscibility when shaken and good appearance when left still. .

Examples 3 to 5, Comparative Examples 4 to 6 Two-layer liquid cosmetics containing the ingredients shown in Table 2 were prepared, and their properties and performance were investigated in the same manner as in Example 1.

The results are shown in Table-2.

From the above results, the composition ratio of spherical powder is 0.5 to 6.0%.
is clearly desirable.

Example 6, Comparative Examples 7 to 9 A two-layer liquid cosmetic having the composition shown in Table 3 was prepared, and its properties and performance were investigated in the same manner as in Example 1. The results are shown in Table-3.

Table 3: Volume: 0.1 cc/g From the above results, the product of the present invention maintains good properties and performance even when well-known and commonly used ingredients such as polyhydric alcohol as a humectant, fragrance, and preservative are added. That is clear.

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

Table 4 From the above results, it is clear that the products of the present invention maintain good performance and properties even when oil is added.

Claims (2)

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