JPH0449215A - Cosmetic of two layer separation type - Google Patents

Abstract

PURPOSE:To obtain a cosmetic showing appearance clearly divided into two layers when the cosmetic is not used, being blended and becoming a uniformly dispersed suspension by shaking, providing skin with excellent touch by blending a specific water-lower alcohol mixture with powder subjected to water repellent treatment. CONSTITUTION:A cosmetic of two layer separation type comprising a liquid- phase component composed of water and a lower alcohol in a weight ratio of 45/55 to 0/100 and a powder subjected to water repellent treatment. One or more powders obtained by organic coating of powder (e.g. fluorine treatment, lecithin treatment, amino acid treatment or liquid paraffin treatment) by treatment with an organic substance or obtained by inorganic coating by treatment with an inorganic substance may be cited as the powder subjected to water repellent treatment. The cosmetic provides skin with excellent touch and has excellent dispersibility of powder in a water layer containing a large amount of lower alcohol.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a two-layer separated cosmetic to be applied to the skin, specifically a liquid layer and a powder layer that are transparent when left standing when not in use. Although it has the appearance of two distinctly separated layers, when shaken during use, the two layers mix to form a uniformly dispersed suspension, giving the user a very pleasant feel on the skin. Regarding cosmetics, the two-layer separated cosmetics of the present invention include Preno-A lotion, aftershave lotion, lotion that can be applied to hands and feet to make it easier to put on and take off gloves and stockings, sweat and It is used as a lotion to give a silky feel to skin that has become sticky due to sebum.

[Conventional technology]

Conventionally, two-layer separation type lotions include those of a liquid-liquid type consisting of an oil layer and a water layer, and those of a liquid-surface type consisting of an aqueous layer and a solid layer such as Calamine Rhino Yon. These products are used after being uniformly dispersed. The former type is a liquid-liquid system and can be easily dispersed, but if a large amount of lower alcohol is blended into the aqueous layer, it will dissolve the oil layer. Does not separate into layers.

In addition, since the latter type uses liquid-surface light, it is not as easy to disperse solids as in the former type. Flocculants such as salts (JP-A-61-
60606), cationic activators, nonionic activators, anionic activators, dispersants typified by polymeric substances, thickeners typified by carboxyl vinyl polymers, and the like.

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

[Problem to be solved by the invention]

However, if a large amount of active agent is used to improve dispersibility in the above-mentioned liquid-surface type two-layer separated lotion, irritation to the skin becomes a problem. Further, the use of thickeners also has drawbacks such as giving a slimy and sticky feel and making it difficult to obtain a light range of use. Furthermore, when the content of lower alcohol in suiseki is increased in order to improve slipperiness and quick-drying properties, the dispersion effect and thickening effect are lost, and water-soluble salts of the flocculant are precipitated.

Additionally, when amorphous inorganic powders such as zinc oxide, kaolin, silicon dioxide, talc, etc. are added to an aqueous layer containing a large amount of lower alcohols, the powders tend to coagulate and solidify (caking) due to their high specific gravity. , it becomes difficult to redisperse the powder.

Furthermore, even if a spherical powder is blended as a powder, due to its spherical form, vibration or the like will cause close packing, causing the powder to coagulate and solidify, making it difficult to redisperse the powder.

Therefore, an object of the present invention is to provide a two-layer separated cosmetic that provides an excellent feel to the skin and has excellent powder dispersibility in the aqueous layer containing a large amount of lower alcohol.

[Means to solve the problem]

As a result of extensive research, the present inventors found that by incorporating water-repellent powder into a specific water-lower alcohol system,
It has been found that a two-layer separated cosmetic 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 451.
The present invention provides a two-layer separated cosmetic containing a liquid phase component of 55 to 0/100 and a water-repellent treated powder.

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

The liquid phase component in the present invention is composed of lower alcohol or water and lower alcohol, and the weight ratio of water and lower alcohol (water/lower alcohol) is 45155 to O/
100, preferably 30/70 to O/100. If the amount of lower alcohol in the liquid phase component is less than the above range, the drying rate will be slow, the product will feel sticky or slimy, and a dry feel will not 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 preferred.

In the two-layer separated cosmetic composition of the present invention, by changing the weight ratio of water and lower alcohol within the above range,
Depending on the desired product characteristics, drying speed, dryness, etc. can be adjusted. In addition, by increasing the amount of the lower alcohol mentioned above, it becomes possible to uniformly dissolve a large amount of various oils such as ester oil, anti-inflammatory agents, various medicinal agents such as plant extracts, ultraviolet absorbers, etc. It can give a unique feel.

The content of the above liquid phase components in two-layer separated cosmetics is usually
The content is preferably 80 to 98% by weight.

In addition, the powder used for the water-repellent powder in the present invention includes inorganic powders such as talc, kaolin, sericite, montmorillonite, silicon dioxide, zinc oxide, and titanium oxide, polyamide, polystyrene, polyethylene, polypropylene, and polypropylene. 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. Among these, organic or inorganic spherical powders are particularly preferred from the viewpoint of slipperiness.

Further, the water repellent treatment method for 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, and examples include fluoride treatment, 7 element treatment, lentin treatment, A method of applying an organic coating to powder by processing with organic substances such as amino acid treatment and liquid paraffin treatment, and a method of applying an organic coating to powder by treatment with organic substances 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 to powder.

The above-mentioned water-repellent powder is one type or two or more types obtained by the above-mentioned water-repellent treatment method, and an organic coat powder and an inorganic coat powder may be used in combination, and the content thereof is as follows: In the two-layer separated cosmetic composition, the amount is preferably 2 to 10% by weight, more preferably 4 to 6% by weight. If the above content is less than 2% by weight, it is difficult to obtain the desired effects of the present invention, such as poor slip properties, and if it exceeds 10% by weight, the powder may remain whitish on the skin. Become.

Further, the particle diameter of the water-repellent powder is preferably 2 to 30 μm. If the particle size is less than 2 μm, it will cause squeaks,
It is difficult to obtain a favorable feel, and if it exceeds 30 μm, the performance in terms of feel deteriorates, such as increased roughness and poor slip properties.

In addition, in the T8 water treatment of the powder by the water repellent treatment method, the treatment agent is 0.01 to 20% by weight, especially 3 to 20% by weight, based on the powder weight.
Preferably, the powder is treated with a proportion of 7% by weight. Further, the water-repellent powder obtained by such a treatment method does not necessarily have to be coated uniformly.

The two-layer separated cosmetic composition of the present invention may be appropriately mixed with other powders, such as spherical powders before water-repellent treatment, talc, titanium powders, etc., to the extent that caking resistance and stability are not impaired. can.

In addition, the two-layer separated cosmetic composition of the present invention further contains surfactants, oil agents, cooling agents, anti-inflammatory agents, medicinal agents, humectants, sterilizers, and ultraviolet absorbers commonly used in cosmetics as auxiliary agents. ,
Flavors, coloring agents, etc. can be mixed as appropriate within a range that does not impair the effects of the present invention.

The two-layer separated cosmetic composition of the present invention includes the liquid phase component and the I
8 water-treated powder, if necessary, by mixing the other powders and the auxiliary agent by ordinary means, and usually,
This is filled into containers and manufactured into products. Examples of the containers include liquid cosmetic bottles, roll-on containers, aerosol containers, and the like.

〔Example] The present invention will be explained in more detail with reference to Examples below.

In addition, the two-layer separated cosmetics in the following examples were evaluated for (1) uniform dispersibility during stirring, (2) feel during use, (3) appearance after standing, and (4) oral stability/repetitive reversibility. The evaluation method is as follows.

(1) Uniform dispersion during stirring Fill a transparent glass bottle (diameter 4.0 cta x height 11.5 cm) with the sample composition to a height of 10.0 cI11,
- When the container is vibrated vertically by hand at a vibration amplitude of 30c+a after being left standing for a day or night, or after being vibrated for 3 hours using a probe type vibration tester [amplitude (vertical movement) 1 x 500 rpm), Judgment was made based on the number of vibrations required until the powder and liquid were uniformly dispersed. The criteria for judgment were as follows.

Rating of number of times until uniform dispersion: 1 to 5 times +2 6 to 10 times +1 15 to 11 times +0 15 to 20 times -1 21 times or more -2 Contents (beak 1' (ease of use) Very good/excellent Easy to use, rather good/Easy to use, average/average Fair, somewhat poor/somewhat difficult to use, poor/difficult to use (2) Feel during use Evaluation of the feel during use was based on slipperiness, lightness, and whitening. A sensory test was conducted by five expert panels, and an absolute evaluation was made based on the following criteria.

■Smoothness and light feeling (evaluation when applied to the skin) Rating
Content +2 Very good +1 Fairly good +0 Average 1 Fairly bad 2 Bad ■ Whitening +2 Not at all (3) Appearance after standing The sample composition was filled into a transparent glass bottle similar to that used in item (1) above. Then, after shaking the glass bottle sufficiently by hand to evenly disperse the solid and liquid layers, let it stand for 1 hour.
Separate the solid and liquid layers. The appearance after standing still shows dirt, dirt, and grime at the separated solid and liquid layers and the interface between the solid and liquid layers.
The presence or absence of transparency and clarity was visually judged. The criteria for judgment were: Good when the liquid layer was substantially transparent and had excellent clarity with no dirt on the interface, and poor when the liquid layer was opaque or had dirt on the interface and poor clarity.

(4) Orally stable/repetitively reversible After filling the sample composition into a glass bottle similar to that used in item (1) above, the room temperature is kept at a constant temperature in which the room temperature changes back and forth in the temperature range of -5°C to 40°C. It was stored stationary in a room for 6 months, and the above item (1) homogeneous dispersibility during stirring and the above item (3)
) The appearance after standing was evaluated, and the presence or absence of oral reproducibility was determined from the results and the results of the evaluation performed immediately after manufacture. The judgment criteria for each evaluation item is that if the characteristic level does not change due to oral administration, it is judged to be stable over time/repeatably reversible (yes), and if the characteristic level deteriorates due to oral administration, it is judged to be stable over time. It was determined that there was no reversibility/repetitive reversibility).

Example 1 A two-layer separated lotion with the following formulation was prepared, and the results were evaluated for (1) uniform dispersibility during stirring, (2) feel during use, (3) appearance after standing, and (4) oral stability. /The item of repeatability was evaluated. The results are shown in Table 1 below. Note that the numerical values in the table are the average values of the evaluation values.

[Formulation] ■Powder (see Table 1) ■Propylene glycol ■Purified water - ■Ethanol (99ν/Vχ) Weight% 3.0 2.0 11.4 Balance ”) From the results shown in Table 1 above, products 1 to 6 of the present invention containing water-repellent powder were more uniform during stirring than comparative products 1 to 5 containing powder that had not been water-repellent treated. It has excellent dispersibility, the powder can be easily dispersed in the liquid, it can form a uniformly dispersed suspension, and it can maintain this dispersion state for an appropriate period of time, making it extremely easy for users to use. I understand.

Furthermore, products 1 to 6 of the present invention were left standing for 1 hour, and the appearance of the separated liquid layer and solid layer was that it had a colorless and transparent liquid part and a clean powder part, and the interface between these two layers was clear. It was beautiful and of good quality.

In addition, for products 1 to 6 of the present invention, after storage for 6 months, the homogeneous dispersibility during stirring and the appearance after standing were the same as those immediately after production, and the restored two-layer (liquid) The appearance of the solid layer (layer-solid layer) was as beautiful as it was immediately after production.

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

Example 2 [Composition] weight% ■Propylene glycol -2.

■Glycyrrhizic acid -------1----0,5 ■Water ----------------
1--11,4■ Ethanol (99ν/Vχ)----
Balance■Fragrance −−−−−−−−−−−−
-----0.5 total
100.0 An anti-inflammatory lotion with the above formulation was prepared.

This product not only has excellent uniform dispersibility when stirred, but also has no problems with oral stability/repetitive reversibility after being stored for 6 months. - The interface of the powder layer was transparent, clear, and beautiful. In addition, this product had a refreshing feeling, a smooth feeling, and a moist feeling, giving a good feeling.

Example 3 [Formulation] Weight % ■Propylene glycol ■Dipropylene glycol ■Water ■Menthol ■Zinc sulfocarbonate ・■Ethanol (99ν/Vχ) 2.0 2.0 30.0 0.2 0.2 Balance meter 100. A two-layer separated aftershave lotion having the above formulation was prepared.

This product not only has excellent uniform dispersibility when stirred, but also has no problems with oral stability/repetitive reversibility after being stored for 6 months. ~The interface of the powder layer was transparent, clear, and beautiful. In addition, this product had a cool, smooth, and moist feeling, and gave a good feel to the skin after shaving.

Example 4 [Formulation] Weight % ■ Dipropylene glycol, 0 ■ Isopropyl myristate ester 2,0 ■ Isopropyl palmitic acid ---5,0 ester ■ Ethanol (99v/vχ) Balance meter
100.0 A two-layer separation type pre-shave lotion having the above formulation was prepared.

This product not only has excellent uniform dispersibility when stirred, but also has no problems with oral stability/repetitive reversibility after being stored for 6 months. - The interface of the powder layer was transparent, clear, and beautiful. In addition, this product made shaving easier and gave the skin a good feel such as a cool, smooth, and moisturizing feeling after shaving.

Example 5 [Formulation] Weight % ■ Dipropylene glycol, 0 ■ Isopropyl myristate ester 2.0 ■ Isopropyl valmitate ester 5.0 ■ Ethanol (99v/vχ) Balance meter 100.0 A lotion with the above formulation was prepared. .

This product not only has excellent uniform dispersibility when stirred, but also has no problems with oral stability/repetitive reversibility after being stored for 6 months. - 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, etc., and also gave a good feel such as a cool and dry feeling to the hands and feet.

〔Effect of the invention〕

The two-layer separated cosmetic composition of the present invention provides an excellent feel to the skin and has excellent powder dispersibility in the aqueous layer containing a large amount of lower alcohol.

Therefore, according to the present invention, the following effects are achieved.

(1) Conventional two-layer separation type lotions require a dispersant, but the two-layer separation type cosmetic of the present invention does not require a dispersant.

(2) Since the aqueous layer contains a large amount of lower alcohol, compared to conventional two-layer separated lotions, it is possible to incorporate ester oils, etc., making it possible to control the feel of the product. In addition, it has excellent quick drying properties because it contains a large amount of lower alcohol.

(3) Since the hydrated powder is used, it has excellent lubricity on the skin surface, resulting in a smooth texture.

Claims (3)

[Claims] (1) A two-layer separated 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 water-repellent treated powder. (2) The two-layer separated cosmetic according to claim 1, wherein the water-repellent powder is one or more types obtained by a method of applying an organic coat to the powder by treatment with an organic substance. (3) The two-layer separated cosmetic according to claim 1, wherein the water-repellent powder is one or more types obtained by a method of applying an inorganic coat to powder by treatment with an inorganic substance.