JPH0768104B2 - Two-layer separated cosmetics - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a two-layer separation type cosmetic composition to be applied to the skin, and more specifically, to a transparent liquid layer and a powder layer when left standing when not in use. It has a distinctly separated appearance in two layers, but when shaken during use, the two layers mix to form a uniformly dispersed suspension, giving a very good feel to the user's skin. The present invention relates to cosmetics, and the two-layer separation type cosmetics of the present invention include pre-shave lotion, after-shave lotion, lotion that is easy to put on and take off gloves and stockings when applied to hands and feet, and skin sticky with sweat, sebum, etc. It is used as a lotion that gives a dry feel.

[Conventional technology]

Conventionally, the two-layer separation type lotion includes a liquid-liquid system composed of an oil layer-water layer and a liquid-solid system composed of a water layer-solid layer such as calamine lotion. Although these products are used by uniformly dispersing, the former type can be easily dispersed because it is a liquid-liquid system, but when a large amount of lower alcohol is blended in the water layer, it dissolves in the oil layer, Do not separate into layers.

In addition, the latter type is a liquid-solid system, so that it is not so easy to disperse the solid as the former type, and in order to disperse the solid, a water-soluble substance such as sodium chloride, calcium chloride, magnesium chloride or the like is added to the water layer. Flocculants such as salts (JP-A-61-60)
No. 606), a cationic activator, a nonionic activator,
Anionic activators, dispersants typified by polymer substances, and thickeners typified by carboxyl vinyl polymers are used.

As the liquid-solid type aqueous layer, a system in which a small amount of a lower alcohol is added to water is generally used, and as the solid layer, talc, montmorillonite, serinite,
Inorganic powders such as kaolin, silicon dioxide and zinc oxide are generally used.

[Problems to be Solved by the Invention]

However, in the above liquid-solid system lotion, when a large amount of an active agent is used to improve dispersibility, irritation to the skin becomes a problem. Further, the use of a thickener has drawbacks such as a slimy feel and a sticky feel, and it is difficult to obtain a refreshing feel. Further, when the content of the lower alcohol in the aqueous layer is increased in order to improve the slip property and the quick drying property, the dispersing effect and the thickening effect disappear, and the water-soluble salt of the coagulant is precipitated.

In addition, if an amorphous inorganic powder represented by zinc oxide, kaolin, silicon dioxide, talc, etc. is mixed in an aqueous layer containing a large amount of lower alcohol, the powder will aggregate and solidify (cake) due to its large specific gravity. , Redispersion of powder becomes difficult.

Furthermore, even if spherical powder is blended as the powder, due to the spherical shape, close packing occurs due to vibration or the like, and the powder coagulates and solidifies, making it difficult to redisperse the powder.

Therefore, an object of the present invention is to provide a two-layer separation type cosmetic composition which gives an excellent feel to the skin and has excellent dispersibility of powder in an aqueous layer containing a large amount of lower alcohol.

[Means for Solving the Problems]

As a result of diligent studies, the present inventors have found that a specific water-lower alcohol type powder contains a water-repellent treated powder,
It was found that a two-layer separation type cosmetic material that achieves the above object can be obtained.

The present invention was made based on the above findings, and the weight ratio of water to lower alcohol (water / lower alcohol) is 45/55.
A two-layer separation type cosmetic composition containing a liquid phase component of ˜0 / 100 and a water-repellent treated powder.

Hereinafter, the two-layer separation type cosmetic composition of the present invention will be described in detail.

The liquid phase component in the present invention comprises a lower alcohol, or water and a lower alcohol, and the weight ratio of water to the lower alcohol (water / lower alcohol) is 45/55 to 0/100, preferably 30/70 to It is 0/100. When the amount of the lower alcohol compounded in the liquid phase component is less than the above range, the drying speed is slow, and stickiness, sliminess and the like are felt, and a dry feel cannot be obtained.

Examples of the lower alcohol include lower alcohols having 1 to 4 carbon atoms such as methanol, ethanol and isopropyl alcohol, and ethanol is particularly preferable.

In the two-layer separation type cosmetic composition of the present invention, by changing the weight ratio of water and lower alcohol within the above range,
The drying speed and dryness can be adjusted according to the desired product characteristics. Further, by increasing the blending amount of the lower alcohol, it becomes possible to uniformly dissolve a large amount of various oil agents such as ester oils, antiphlogistics, various medicinal agents such as plant extracts, and ultraviolet absorbers. It is possible to give the feeling a characteristic.

The content of the liquid phase component, in the two-layer separation type cosmetics, usually,
80-98% by weight is recommended.

The powder used for the water-repellent treated powder in the present invention includes talc, kaolin, sericite, montmorillonite, silicon dioxide, zinc oxide, inorganic powder such as titanium oxide, polyamide, polystyrene, polyethylene, polypropylene, poly Organic powders such as tetrafluoroethylene, polyvinyl chloride, acrylic acid or acrylic acid ester polymer, methacrylic acid or methacrylic acid ester polymer, acrylic acid / styrene copolymer, polystyrene / divinylbenzene copolymer, etc. Of these, organic or inorganic spherical powders are particularly preferable from the viewpoint of slipperiness.

Further, the water repellent treatment method of the powder is not limited as long as it is a method that can obtain a stable water repellent powder in the liquid phase component, for example, fluorine treatment, lecithin treatment, amino acid treatment and A method of applying an organic coating to the powder by treatment with an organic substance such as liquid paraffin treatment, or a treatment with an inorganic substance such as zirconia treatment, titanium treatment, aluminum hydroxide treatment, barium sulfate treatment, silica treatment and various coupling treatments. Examples include a method of applying an inorganic coat.

As the above-mentioned water-repellent treated powder, one kind or two or more kinds obtained by the above-mentioned water-repellent treating method is used, and organic coated powder and inorganic coated powder may be used in combination, and the content thereof is It is preferably 2 to 10% by weight, more preferably 4 to 6% by weight in the two-layer separated cosmetic composition. If the above content is less than 2% by weight, it is difficult to obtain the intended effect of the present invention such as poor slipperiness, and if it is more than 10% by weight, the powder remains whitish on the skin. Become.

The particle diameter of the water repellent treated powder is preferably 2 to 30 μm. If the particle size is less than 2 μm, squeaking occurs, and it is difficult to obtain a desirable feel, and if it exceeds 30 μm, the feel on the touch surface is deteriorated, such as feeling roughness and poor slipperiness.

The water repellent treatment of the powder by the water repellent treatment method is 0.01 to 20% by weight, especially 3 to 7% by weight of the treating agent based on the weight of the powder.
It is preferable to treat the powder at a ratio of 1. The water-repellent treated powder obtained by such a treatment method does not necessarily have to be uniformly coated.

In the two-layer separation type cosmetic composition of the present invention, other powders, for example, spherical powder before water repellent treatment, powders of talc, titanium and the like are appropriately mixed within a range not impairing caking resistance and stability. it can.

Further, the two-layer separation type cosmetic composition of the present invention further includes, as an auxiliary agent, a surfactant, an oil agent, a cooling agent, an anti-inflammatory agent, a medicinal agent, a moisturizing agent, a bactericidal agent, and an ultraviolet absorbent which are generally used in cosmetics ,
Fragrances, colorants and the like can be appropriately mixed within a range that does not impair the effects of the present invention.

The two-layer separation type cosmetic composition of the present invention is obtained by mixing the liquid phase component and the water repellent treated powder, if necessary, the other powder and the auxiliary agent by a usual means, This is filled into a container and commercialized. As the container,
Examples include liquid cosmetic bottles, roll-on type containers, aerosol containers and the like.

〔Example〕

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

In addition, the two-layer separation type cosmetics in the following examples have (1) uniform dispersibility upon stirring, (2) feel during use, (3) appearance after standing and (4) stability over time / reversible reversibility. The sex evaluation method is as follows.

(1) Uniform dispersibility when stirring Sample composition in a transparent glass bottle (diameter 4.0 cm x height 11.5 cm)
To a height of 10.0 cm and left standing overnight, or after 3 hours of vibration using a Matsudaira type vibration tester (amplitude (vertical movement) 1 mm x 500 rpm), the container can be shaken vertically by 30 cm in a vertical direction. Judgment was made based on the number of vibrations until the powder and liquid were evenly dispersed when vibrated in.

(2) Feeling during use Regarding the feeling during use, the sensory test was conducted by 5 specialized panels for slipperiness, refreshing feeling and whitening, and absolute evaluation was performed according to the following criteria.

Smoothness and refreshing feeling (evaluation when applied to the skin) Whitening (3) Appearance after standing The sample composition was filled in the same transparent glass bottle as used in the above item (1), and the glass bottle was sufficiently vibrated by hand to uniformly disperse the solid layer and the liquid layer. After that, let stand for 1 hour,
Separate the solid and liquid layers. With respect to the appearance after standing, the presence or absence of stains, transparency, and clarity at the separated solid layer and liquid layer and the interface between the solid layer and the liquid layer was visually judged. The criteria for judgment were good when the liquid layer was substantially transparent and there was no stain on the interface and was excellent in clarity, and bad when the liquid layer was opaque or had stains on the interface and was poor in clarity.

(4) Daily stability / reversible reversibility A constant temperature at which the room temperature is reciprocally changed within a temperature range of -5 ° C to 40 ° C after the sample composition was filled in a glass bottle similar to that used in the above item (1). The sample was stored in a chamber for 6 months and evaluated for the item (1) uniform dispersibility at the time of stirring and the item (3) appearance after standing, and the results and the results of the evaluation immediately after production were used. The presence or absence of day-to-day reproducibility was judged.
Judgment criteria are as follows: If the characteristic level of each evaluation item does not change with time, it is judged that there is daily stability / repetitive reversibility (yes). If the characteristic level deteriorates with time, It was judged that there was no daily stability / repetitive reversibility (none).

Example 1 A two-layer separation type lotion having the following composition was prepared, and (1) uniform dispersion upon stirring, (2) feel during use, (3) appearance after standing and (4) stability over time. / It evaluated about the item of repeated reversibility. The results are shown in Table 1 below. The numerical values in the table are average values of evaluation values.

[Blending] Weight% powder (Refer to Table 1) …… 3.0 Propylene glycol …… 2.0 Purified water …… 11.4 Ethanol (99v / v%) …… Balanced fragrance …… 0.5 Total 100.0 From the results shown in Table 1 above, the products 1 to 6 of the present invention containing the water-repellent treated powder have more uniform dispersibility upon stirring than the comparative products 1 to 5 containing the powder not subjected to the water repellent treatment. It is found that it is extremely easy for the user to use because the powder is easily dispersed in the liquid and a suspension in which the powder is uniformly dispersed is generated, and this dispersed state can be maintained for an appropriate time. .
Further, the products 1 to 6 of the present invention were allowed to stand for 1 hour, and the appearance of the separated liquid layer-solid layer had a colorless transparent liquid part and a powder part without stain, and the interface between these two layers was It was very clear and beautiful.

In addition, the products 1 to 6 of the present invention have the same uniform dispersibility at the time of stirring after storage for 6 months and the appearance after standing, which is similar to that immediately after the production, and the two layers (liquid layer) restored by standing still after dispersion The appearance of (solid layer) was as beautiful as immediately after production.

Further, the products 1 to 6 of the present invention had a low degree of whitening, had a good slipperiness and a refreshing feeling, and had an excellent feel during use.

Example 2 [Blending]% by weight Water repellent treated powder ... 3.0 (lecithin treated polystyrene powder, average particle size 5)
μm) Propylene glycol …… 2.0 Glycyrrhizic acid …… 0.5 Water …… 11.4 Ethanol (99v / v%) …… Balance fragrance …… 0.5 Total 100.0 The anti-inflammatory lotion with the above composition was prepared.

This product is not only excellent in uniform dispersion at the time of stirring, but also has no problem with respect to stability over time after storage for 6 months / reversible reversibility. Layer-
The interface of the powder layer was transparent, clear and beautiful.
In addition, this product has a combination of a refreshing feeling, a dry feeling, and a moist feeling, and gives a good feeling.

Example 3 [Blending]% by weight Water repellent treated powder …… 3.0 (zirconia treated polymethylmethacrylate powder, average particle size 18 μm) Propylene glycol …… 2.0 Dipropylene glycol …… 2.0 Water …… 30.0 Menthol …… 0.2 Sulfo Zinc Carbolate …… 0.2 Ethanol (99v / v%) …… Balanced fragrance …… 0.5 Total 100.0 A two-layer separated aftershave lotion with the above composition was prepared.

This product is not only excellent in uniform dispersion at the time of stirring, but also has no problem with respect to stability over time after storage for 6 months / reversible reversibility. Layer-
The interface of the powder layer was transparent, clear and beautiful.
In addition, this product combined a refreshing feel, a dry feel and a moist feel, and gave a good feel to the skin after shaving.

Example 4 [Blending]% by weight Water repellent treated powder ……………… 3.0 (Fluorine treated nylon powder, average particle size 7 μm) Propylene glycol ………… 2.0 Isopropyl myristate ester ………… 2.0 Isopropyl Palmitate: 5.0 5.0 Ethanol (99v / v%) Balanced fragrance: 0.5 Total 100.0 A two-layer separated preshave lotion with the above composition was prepared.

This product not only excels in uniform dispersion at the time of stirring, but also has no problem with respect to stability over time after storage for 6 months / reversible reversibility. Layer-
The interface of the powder layer was transparent, clear and beautiful.
Further, this product facilitates shaving, and gives a good feeling such as a refreshing feeling, a dry feeling and a moist feeling to the skin after shaving.

Example 5 [Blending]% by weight Water-repellent treated powder: 3.0 (Fluorine-treated polystyrene / divinylbenzene copolymer powder, average particle size 10 μm) Water-repellent treated powder: 1.0 (Fluorine-treated polyethylene powder, average particle size) 7μ
m) Propylene glycol ...... 2.0 Isopropyl myristate ...... 2.0 Isopropyl palmitate ...... 5.0 Ethanol (99v / v%) ...... Balanced fragrance ...... 0.5 Total 100.0 A lotion with the above composition was prepared.

This product is not only excellent in uniform dispersion at the time of stirring, but also has no problem with respect to stability over time after storage for 6 months / reversible reversibility. Layer-
The interface of the powder layer was transparent, clear and beautiful.
In addition, this product made it easy to put on and take off stockings, socks, gloves, and the like, and gave a good feeling to the limbs such as a refreshing feeling and a dry feeling.

〔The invention's effect〕

The two-layer separation type cosmetic composition of the present invention gives an excellent feel to the skin and has excellent dispersibility of powder in an aqueous layer containing a large amount of a lower alcohol. Therefore, according to the present invention, the following effects are exhibited.

(1) Although the conventional two-layer separation type lotion required a dispersant, the two-layer separation type cosmetic composition of the present invention does not require a dispersant.

(2) Since a large amount of lower alcohol is contained in the water layer, ester oil or the like can be blended in compared with the conventional two-layer separation type lotion, and the feel of the product can be controlled. Also, since it contains a large amount of lower alcohol, it has excellent quick-drying properties.

(3) Since the water-repellent treated powder is used, the lubricity of the skin surface is excellent, and as a result, a dry feel is obtained.

Claims (3)

[Claims] 1. A two-layer separation type cosmetic containing a liquid phase component having a weight ratio of water to lower alcohol (water / lower alcohol) of 45/55 to 0/100 and a water repellent treated powder. 2. The two-layer separated cosmetic composition according to claim 1, wherein the water-repellent treated powder is one or more types obtained by a method of applying an organic coating to the powder by a treatment with an organic substance. . 3. The two-layer separated cosmetic composition according to claim 1, wherein the water-repellent treated powder is one kind or two or more kinds obtained by a method of applying an inorganic coat to the powder by a treatment with an inorganic substance. .