JPH0455042B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a cosmetic applicator material and a method for producing the same, and more particularly, to a cosmetic applicator material suitable for applying aqueous makeup cosmetics after getting wet with water, The present invention relates to a porous material for a cosmetic applicator suitable for applying cosmetics as is, and a method for producing the same.

[Conventional technology]

BACKGROUND ART Water-based makeup cosmetics in the form of solid powder have been widely used.

Water-based makeup cosmetics are in the form of a solid powder and are applied by dissolving them in water.
After the cosmetic is attached to a porous body impregnated with water, the cosmetic is applied to the skin using this porous body. Because it uses water, it provides a refreshing feeling and has traditionally been used as a summer cosmetic.

In addition, recently, makeup cosmetics that can be used with or without water (i.e., similar to water-based makeup cosmetics, wet the applicator with water and then apply the cosmetic by adhering it to the applicator) have also been introduced. This type of cosmetic (which allows you to apply the cosmetic while it is dry without getting it wet) is easy to use and convenient, so it is preferred by consumers and is often used as a summer cosmetic.

As materials for applicators for aqueous makeup cosmetics, various foams such as natural sponges, polyurethane foams, rubber latex foams, and polyvinyl alcohol foams, and porous materials such as nonwoven fabrics have been widely used.

Polyurethane foam, polyurethane foam,
Various foams such as rubber latex foam and porous materials such as nonwoven fabrics are used.

[Problem that the invention seeks to solve]

There is a strong demand for cosmetics and cosmetic applicators used for summer makeup to provide a cooling sensation when used.

Natural sponges and polyvinyl alcohol foams are flexible and have a cool feel when wet, so they are preferred for use in applying water-based makeup cosmetics. However, natural sponge is expensive and, furthermore, is stiff when dry, making it unsuitable for use as a dual-use cosmetic applicator that can be used with or without water. Furthermore, although polyvinyl alcohol foam is flexible when wet, it becomes rigid when dry, making it unsuitable as a dual-use cosmetic applicator for use with or without water. Moreover, when rewetting the foam from a dry state, there is a problem in that it takes time for the water to penetrate into the foam.

On the other hand, polyurethane foam and rubber latex foam are flexible even in a dry state, so they are suitable as a dual-use makeup cosmetic applicator that can be used with or without water. However, even when applied using water, there is a problem in that the skin does not feel cool when it comes into contact with the skin.

The present invention solves these conventional problems, and when applying water-based makeup cosmetics, it is possible to apply the cosmetics refreshingly while getting a cooling sensation from the applicator used, and moreover, it is flexible even in a dry state. It is an object of the present invention to provide a porous material for a cosmetic applicator that is suitable for application of dual-use cosmetics with and without water, and a method for producing the same.

[Means for solving problems]

The present invention solves the above-mentioned problem by providing a foam mainly composed of rubber latex, which is breathable and flexible even in a dry state. The problem was solved by a cosmetic applicator material having micropores formed by the dissolution of dissolvable particulates.

Furthermore, according to the present invention, as a method for manufacturing the cosmetic applicator material, fine particles soluble in water or an aqueous solution are mixed and blended into a liquid mainly composed of rubber latex, and a gas is blown into the mixed liquid. Or, by mixing a foaming agent, solidifying it in a foamy state, and vulcanizing it,
Provided is a method for producing a cosmetic applicator material, which comprises forming a rubber latex foam, washing the rubber latex foam with water or an aqueous solution, and eluting the fine particles from the rubber latex foam to form micropores. be done.

[Effect]

In the cosmetic applicator material of the present invention, small pores formed by air bubbles and micropores formed by elution of fine particles are present throughout the rubber latex foam. As described above, since there are small pores and micropores throughout the cosmetic application material, when the cosmetic applicator using the material of the present invention gets wet with water, the micropores cause a capillary phenomenon, and water penetrates the micropores. It is transmitted and floats on the cosmetic-applied surface, keeping the cosmetic-applied surface always wet. Moreover, since this surface has a fine uneven structure and has air permeability and water permeability, water easily evaporates, and the evaporation of water cools the surface on which the cosmetic is applied, thus giving a refreshing feeling during application.

Furthermore, since the entire cosmetic applicator has small pores and micropores, the amount of water retained when the cosmetic applicator is wetted with water is increased.

Furthermore, since the material of the applicator is rubber latex foam and is flexible even in a dry state, it can be used to apply both water- and water-less cosmetics.

〔Example〕

The cosmetic applicator material of the present invention is a foam mainly composed of rubber latex, which is breathable and flexible even in a dry state. Micropores are formed by elution of fine particles that can be dissolved in an aqueous solution.

The aqueous solution may be an acidic aqueous solution or an alkaline aqueous solution, or an aqueous solution containing an oxidizing agent or a reducing agent. Furthermore, an aqueous solution containing enzymes such as diastase and amylase may be used to dissolve fine particles such as starch.

As the rubber latex, either natural rubber latex or synthetic rubber latex such as NBR latex or SBR latex can be used.

Fine particles that can be dissolved in water or an aqueous solution to be mixed into the rubber latex foam include starch, dextrin, higher alcohols (e.g., oleyl alcohol, stearyl alcohol, pentaerythritol, polypropylene glycol, polyethylene glycol, etc.), fatty acids (e.g., stearin), etc. (oleic acid, etc.), calcium carbonate, etc. may be used.

The size (particle diameter) of the fine particles is such that the fine pores formed by the elution of the fine particles can moisten the surface to which the cosmetic is applied due to capillary action.

The particle size of potato starch, corn starch, sweet potato starch, etc. is generally about 1 to 200 microns, but it is preferable that the fine particles are smaller than the skeleton of the foam. If the fine particles are larger than the foamed skeleton, the foamed skeleton will be torn, resulting in poor foaming stability, resulting in poor foaming, and also reducing capillary action. Therefore, the particle size is less than 100 microns,
Preferably, it is 50 microns or less.

In addition, if the particle size is too small and the amount of fine particles mixed in the foam is small, the amount of water that rises to the surface of the applicator due to capillary action may not be sufficient, so the particle size should be approximately 1 micron. It is preferable to keep it up to.

In order to produce the cosmetic applicator material of the present invention, first, a foaming raw material liquid containing rubber latex as a main component to form a foam is added with a crosslinking agent or a vulcanizing agent,
Mix the foam stabilizer and inorganic or organic particulates.

Regarding the mixing ratio of the raw materials and fine particles that form the foam, if there are too few fine particles, the wetting effect due to capillary action will be small, and if there are too many, the strength of the foam will decrease.
The viscosity during foaming becomes too high and foaming becomes impossible. Therefore, the amount of fine particles should be 5 to 100 parts by weight, preferably 5 to 30 parts by weight, per 100 parts by weight of the solid content of the rubber.

As the crosslinking agent for rubber latex, sulfur or sulfur-containing vulcanizing agents, vulcanization accelerators, etc. may be used.

As the foam stabilizer, potassium oleate, potassium stearate, ammonium stearate, ammonium oleate, etc. may be used.

Air or other gas is blown into the mixed liquid using an open-cell device such as an oak mixer, or a blowing agent is mixed therein to foam the mixture three to five times.

As the blowing agent, gas generating substances such as low boiling point liquids such as freon, butane, propane, etc. can be used.

Next, the foamed mixture as described above is discharged from the open cell device, put into an arbitrary cast body, solidified, heated or steamed to vulcanize, and taken out from the cast body.

After slicing, punching, etc. this foam, the molded foam is washed in water (cold water or hot water is acceptable) or an aqueous solution to remove some of the fine particles and foam stabilizer contained in the foam. Elution forms micropores in the foam.

In the above case, the fine particles of starch, dextrin, higher alcohol, etc. were eluted after the foam was formed into the shape of a cosmetic applicator, but when the foam was in the form of a sheet, the fine particles were eluted. It may also be finished as a cosmetic applicator by punching or the like.

According to another embodiment of the cosmetic applicator material of the present invention, similar to the previous embodiment, the applicator material is made of a rubber latex foam that is breathable and flexible even in a dry state. Similarly, the foam has small pores formed by air bubbles and micropores formed by elution of fine particles soluble in water or an aqueous solution, and further contains fiber powder in the foam.

By mixing the fiber powder into the foam in this way, it has a good feel, and furthermore, it is possible to obtain even better water absorbency and a cooling effect when wet with water.

Examples of the fiber powder include cellulose fibers such as cotton, viscose rayon, Kyupura, hemp, flax, paper, and bulbs; protein fibers such as crushed products of sponge, wool, animal hair, and natural leather; and nylon, polyester, and acrylic fibers. Finely pulverized synthetic fibers such as the following can be used. Preferably, hydrophilic fibers such as cellulose fibers and protein fibers are used. In the case of synthetic fibers, it is preferable to use fine denier pulverized fibers.

If the fiber powder is too large, it will have an adverse effect on the foam, so use one that can pass through a sieve of about 20 mesh. Preferably, one that passes through a 50 mesh sieve is used.

The thickness of the fibers used in the fiber powder is 15 deniers or less, preferably 5 deniers or less. For synthetic fibers, the denier should be 1 denier or less to provide a good feel. In particular, if the fiber is made of synthetic fibers such as nylon or polyester and has an ultra-fine denier of 0.005 to 0.2 denier, such as splittable fiber or sea-island fiber, a very good feel can be obtained.

In order to form a foam containing fiber powder, the fiber powder may be mixed together with the vulcanizing agent, foam stabilizer, and inorganic or organic fine particles into the rubber latex for forming the foam. The mixing ratio of the fiber powder is 1 to the solid content of the foaming raw material liquid.
~40% by weight, but preferably 3-15% by weight
That's about it. When the above-mentioned preferred range is set, an even better feeling can be obtained.

Even when fiber powder is mixed, the cosmetic applicator material can be manufactured by processing in the same manner as in the above-described embodiment. That is, air or other gas is blown into the mixed liquid using an open-cell device such as an oak mixer, or a foaming agent is mixed thereinto to foam the mixture three to five times. The foamed mixture as described above is discharged from the open cell device, poured into an arbitrary cast body, solidified, heated or steamed to vulcanize, and taken out from the cast body. After slicing, punching, etc. the taken out foam, the molded foam is washed in water or an aqueous solution (acidic aqueous solution, alkaline aqueous solution, aqueous solution containing an oxidizing agent or aqueous solution containing a reducing agent), and then A portion of the fine particles and foam stabilizer contained therein are eluted to form micropores in the foam.

The porous material having the foam thus obtained is subjected to processing such as punching and molding, and is finished as a cosmetic applicator.

(Example 1) 30% aqueous dispersion made by emulsifying 200 parts by weight of NBR latex Nipol LX-511 and 30 parts of a mixture of zinc white and sulfur at a ratio of 3:1 with 70 parts of water...18 parts by weight , vulcanization accelerator MZ...4 parts by weight, vulcanization accelerator EZ...
Formulation A consisting of 5 parts by weight, anti-aging agent SP...1.8 parts by weight, Trimenbase...1.5 parts by weight, Emulgen 920 [product of Dai-ichi Kogyo Co., Ltd.]...1.3 parts by weight
Corn starch…35 parts by weight, water…60 parts by weight,
Sodium silicofluoride... while injecting 10 parts by weight of Formulation B using an Oaks mixer at a ratio of 35 parts by weight of Formulation B to 100 parts by weight of Formulation A,
The mixture was discharged while foaming to about 4 times its original size, and was cast and solidified into a cylindrical shape.

Furthermore, it was steam-vulcanized at 102°C for 30 minutes in a steaming box to obtain an NBR latex foam.

This latex foam was sliced into 5 mm thick pieces to obtain a disc-shaped puff material.

After grinding and molding this material, caustic soda
Soaked in 0.05% aqueous solution (40℃) for 24 hours, then
Stirring, washing, and dehydration were repeated twice to elute the corn starch, which was then dehydrated and dried.

The puff thus obtained had extremely excellent absorbency and water retention.

Wet the finished product and bring it to standard condition (22
℃, relative humidity 65%) and placed on a glass plate parallel to the wind at a wind speed of 1 m/s. Then, the surface temperature of the surface of the cosmetic applicator material on the side on which the foam was formed was measured using a digital thermometer Delta SK-1250 (manufactured by Sato Keiki Seisakusho Co., Ltd.) equipped with a surface contact sensor.

Instead of using a surface contact type thermometer, you can use a thermometer that can measure temperature without contact, such as the non-contact thermometer THERMO manufactured by Optix Co., Ltd.
-HUNTER may also be used. This thermometer collects infrared energy (detection wavelength: 7 to 20 μm) using an aspherical mirror, converts it into an electrical signal using a thermopile, processes it electrically, and displays the temperature on a liquid crystal display. Changes in can be easily measured.

Measurement result: After 3 minutes, the surface temperature dropped to 15°C.

(Comparative Example) Using a cosmetic applicator (which does not have the micropores of the present invention as described above) made of 8 mm thick NBR latex foam (product of Yukigaya Chemical Co., Ltd.), the above-mentioned The change in surface temperature of the cosmetic applicator was measured using the measurement method.

Measurement result: After 3 minutes, the surface temperature was 20°C.

(Example 2) Natural rubber latex...200 parts by weight, vulcanization accelerator
EZ...1.8 parts by weight, vulcanization accelerator MZ...3.2 parts by weight, anti-aging agent SP...2.2 parts by weight, trimene base...0.8 parts by weight, sulfur...11 parts by weight, potassium oleate...8 parts by weight, zinc white...5 Liquid A is a mixture consisting of 20 parts by weight of cyclodextrin insoluble in cold water; 12 parts by weight of zinc white; 2.1 parts by weight of vulcanization accelerator D;
Sodium silicofluoride...11 parts by weight Cyclodextrin...10 parts by weight, urethane emulsion Superflex #100 [product of Daiichi Kogyo Seiyaku Co., Ltd.]...
A mixture consisting of 55 parts by weight was used as liquid B, and was poured into a cylinder at a ratio of 100 parts by weight of liquid A to 60 parts by weight of liquid B, foamed to about 4 times the volume, and poured into a cylinder. The product was cast into a shape, left to stand, and steamed and vulcanized for 45 minutes while solidifying to obtain a mixed latex foam of natural rubber/polyurethane.

After slicing this latex foam to a thickness of 7 mm, it was immersed in an aqueous solution containing amylase and diastase at a ratio of 1:2 at 40°C for 24 hours, and then stirred, washed and dehydrated twice, and then cyclo-processed. After eluting the dextrin, it was dehydrated and dried.

The puff thus obtained had excellent absorbency and water retention, and was also excellent in strength. Furthermore, when the foam was wetted with water as in Example 1, the cooling effect on the surface of the foam was large.

(Example 3) Natural rubber latex...150 parts by weight, SBR latex JSR#561 [product of Japan Synthetic Rubber Industry Co., Ltd.]...100 parts by weight, vulcanization accelerator EZ...2.5 parts by weight,
Vulcanization accelerator MZ...4 parts by weight, anti-aging agent SP...2.6
Parts by weight of trimene base, 2 parts by weight of sulfur, 15 parts by weight of sulfur, 7 parts by weight of potassium oleate, and 30 parts by weight of corn starch were used as liquid A; zinc white 16 parts by weight, and vulcanization accelerator. D...1 part by weight,
Sodium silicofluoride...7 parts by weight (powder), Dicnal
#2575 [Polyacrylic acid ester emulsion,
Product of Dainippon Ink & Chemicals Co., Ltd.]...10 parts by weight, urethane emulsion Superflex #100 [Product of Dai-ichi Kogyo Seiyaku Co., Ltd.]...70 parts by weight, Stearic acid powder...10 parts by weight. Using the OAKS mixer as liquid B, mix liquid A and liquid B at a ratio of 1:0.4, blow air in, foam the mixture to 3.5 times the volume, and pour it into a square prism shape. It was left for a minute to solidify. Thereafter, it was heated in a steaming box at 101°C for 45 minutes, taken out, and sliced into 8 mm thick pieces to form rubber foam sheets. After punching this into a circular shape, use 3 parts of caustic soda.
g/1, stirring, washing, and dehydration in an aqueous solution at 40°C for 2
After repeating the process several times, it was further washed with hot water to elute the corn starch, and then dehydrated and dried.

The puff thus obtained had excellent absorbency and water retention, and was also excellent in strength. Further, when the foam was wetted with water as in Example 1, the cooling effect on the surface of the foam was large.

(Example 4) NBR latex Nipol LX-531 [product of Nippon Zeon Co., Ltd.]...100 parts by weight, trimene base...0.4 part by weight, vulcanization accelerators Accel EZ and MZ [product of Kawaguchi Chemical Co., Ltd.] A 50% water emulsion made from a mixture mixed at a ratio of 1:2...2
Parts by weight, 50% water emulsion of anti-aging agent ANTAGE SP [product of Kawaguchi Chemical Co., Ltd.]…2 parts by weight, 60% water emulsion of sulfur…7 parts by weight, 20 parts by weight of potassium oleate
% aqueous solution...3 parts by weight, ammonium stearate 30%
Aqueous solution...5 parts by weight, corn starch...30 parts by weight, 5% aqueous poval solution...15 parts by weight to Formulation A; 25% water emulsion of zinc white...20 parts by weight, vulcanization accelerator Accel D [ 30% of Kawaguchi Chemical Co., Ltd. products]
Mixture B consisting of 3 parts by weight of a water emulsion, 10 parts by weight of a 25% water emulsion of sodium silicofluoride, and 4 parts by weight of freon as a blowing agent was made into 150 parts by weight of Mixture A using an Oaks mixer. 20 parts by weight of Formulation B was injected into the mixture, and air was further blown into the mixture to foam the mixture to about 4 times its original size.

Further, after vulcanization at 102°C for 20 minutes, it was removed from the mold and sliced into 10 mm thick pieces to obtain a disc-shaped puff material.

This material was added to a 0.1% aqueous solution of diastase at 40°C.
The sample was soaked in water for 20 hours, washed with hot water at 90°C to elute the corn starch, and then dehydrated and dried.

The puff thus obtained had extremely excellent absorbency and water retention. Furthermore, when the foam was wetted with water as in Example 1, the cooling effect on the surface of the foam was large.

〔Effect of the invention〕

According to the cosmetic applicator material of the present invention, the foam mainly composed of rubber latex has small pores formed by air bubbles and micropores formed by elution of fine particles. When the cosmetic applicator made using this method is wetted with water, capillary action occurs due to the micropores, and water travels through the micropores and rises to the cosmetic application surface, keeping the cosmetic application surface constantly wet. Therefore, when applying the cosmetic, the water comes into contact with the skin before the surface on which the cosmetic is applied, giving a cooling sensation and allowing the cosmetic to be applied in a refreshing manner.

Moreover, since the cosmetic application surface has a fine uneven structure and has air permeability and water permeability, water evaporates easily, and the evaporation of water cools the cosmetic application surface, making it even more refreshing during application. You can feel it.

Further, according to the cosmetic applicator material of the present invention, since small pores and micropores are present throughout the foam, the amount of water retained when the cosmetic applicator is wetted with water is increased.

Furthermore, when fiber powder is mixed into the foam, the feel becomes better. Furthermore, if the fiber powder is made hydrophilic, it is possible to obtain even better water absorbency and a cooling effect when wet with water.

Since the cosmetic applicator material of the present invention has a soft feel, it is suitable not only as an applicator for aqueous makeup cosmetics, but also as an applicator for other cosmetics, such as liquid cosmetics.

Claims (1)

[Scope of Claims] 1. A foam mainly composed of rubber latex that is breathable and flexible even in a dry state, and the foam has small pores formed by air bubbles and is soluble in water or an aqueous solution. A cosmetic applicator material characterized in that it has micropores formed by possible elution of fine particles. 2 A foam mainly composed of rubber latex that is breathable and flexible even in a dry state, and the foam is formed by the elution of fine particles that can be dissolved in water or an aqueous solution, in addition to small pores formed by air bubbles. A material for a cosmetic applicator, characterized in that it has fine pores and further contains fiber powder. 3. Mix and blend fine particles that can be dissolved in water or an aqueous solution into a liquid mainly composed of rubber latex, blow gas into the mixed liquid or mix a foaming agent, solidify in a foamy state, and vulcanize. A method for manufacturing a cosmetic applicator material, which comprises forming a rubber latex foam, washing the rubber latex foam with water or an aqueous solution, and eluting the fine particles from the rubber latex foam to form micropores. 4. Fiber powder and fine particles that can be dissolved in water or an aqueous solution are mixed and blended into a liquid mainly composed of rubber latex, and the mixed liquid is blown with gas or mixed with a foaming agent to solidify in a foamy state. A cosmetic applicator characterized in that the rubber latex foam is vulcanized to form a rubber latex foam, and the rubber latex foam is washed with water or an aqueous solution to elute the fine particles from the rubber latex foam and form micropores. How the material is manufactured.