JPH0714853B2 - Cosmetic capsule and method for producing the same - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a capsule surface in which aluminum alginate is used as a film material to control film strength and water insolubility, and a lipophilic substance beneficial to the skin is incorporated in the film. The present invention relates to a cosmetic capsule containing a hydrophilic substance and a method for producing the same.

2. Description of the Related Art Capsules currently on the market at present have various forms, but there are seamless capsules other than hard capsules, soft capsules, and the like. Since the film material of the soft capsule is made of gelatin or the like and the film is thick and hard, it is difficult to rupture the capsule easily by hand, and a special device is required to rupture the capsule.

Further, in the seamless capsule, the coating material and the core material of the capsule are respectively transferred by the double nozzles to generate a jet flow of the coating material and the core material at the end of the double nozzle, and the surface tension is generated at the tip of the jet flow. The coating material forms droplets surrounding the core material, and then the droplets are dropped into the curing liquid or the cooling liquid. This capsule is a capsule formed by a double nozzle dropping method applying a liquid hardening coating method, and it is known that particles are spherical due to the principle of the manufacturing method and have excellent fluidity and filling property. There is.

In the production of such seamless capsules, a method has been widely used in which sodium alginate is used as a coating material and the resulting droplets are dropped into an aqueous calcium chloride solution to cure. However, the capsule obtained by curing sodium alginate with calcium chloride has a too high film strength, and thus there is a problem that it is difficult to burst when used as a cosmetic product. In addition, when a seamless capsule using a coating material obtained by dropping a droplet of an aqueous gelatin solution into a cooling liquid and curing it is applied to cosmetics, the gelatinous external surface of the capsule is a hydrophilic substance. The film is melted.

Therefore, when applying such a seamless capsule to cosmetics, the film strength at which the capsule bursts is appropriately adjusted because the capsule is used by bursting,
It should be a capsule in which the capsule film is not dissolved by the hydrophilic substance when the hydrophilic substance is added as the outer form of the capsule and the capsule form is not deformed.

On the other hand, lipophilic substances can be mentioned as substances particularly active on the skin, and at present, lipophilic substances are frequently used in the production of cosmetics. However, many of these lipophilic substances are oxidized as they come into contact with air, which causes a problem in the stability of cosmetics, making it difficult to blend them in large amounts in cosmetics, and some lipophilic substances could not be blended at all.

OBJECT OF THE INVENTION The present invention is intended to solve the problems associated with the prior art, and is a core made of a lipophilic substance capable of imparting activity to the skin and having excellent mixability and safety in cosmetics. Capsule and a cosmetic capsule comprising a seamless spherical water-insoluble coating material having an appropriate coating strength and a hydrophilic substance which gives moisturizing power to the skin are added to the outer shape of the capsule, and a method for producing the same. Is intended to provide.

SUMMARY OF THE INVENTION The capsule for cosmetics according to the present invention has a concentration of 0.2% by weight to 10% by weight of a droplet in which a lipophilic substance as a core material is surrounded by an aqueous alginic acid alkali salt solution having a concentration of 0.5% by weight to 3% by weight.
It is characterized in that it is hardened with an aqueous solution of aluminum salt and washed with water, and then a hydrophilic substance is added to its surface.

The method for producing a cosmetic capsule according to the present invention has a concentration of 0.5.
The aqueous solution of alkali salt of alginic acid and lipophilic substance in an amount of 3% by weight to 3% by weight is passed through a double nozzle to prepare a droplet in which the aqueous solution of alkaline salt of alginic acid surrounds the lipophilic substance. Is cured with an aluminum ion aqueous solution to form a capsule, the capsule is washed with ion-exchanged water, and then a hydrophilic substance is added to the surface of the capsule.

According to the cosmetic capsule and the method for producing the same according to the present invention, the core material made of a lipophilic substance is coated with a seamless spherical water-insoluble coating material having appropriate coating strength, and the capsule is externally coated. It is possible to provide a capsule for cosmetics to which a hydrophilic substance that imparts moisturizing power to the skin is added.

DETAILED DESCRIPTION OF THE INVENTION The cosmetic capsule according to the present invention can be briefly described by transferring an aqueous solution of an alkali metal alginate or an ammonium alginate and a lipophilic substance to the tip of a double nozzle to form an alkali metal alginate or alginate. An ammonium salt aqueous solution is prepared to form droplets surrounding a lipophilic substance, and an encapsulation step of dropping the droplets into a curing liquid of a polyvalent metal ion aqueous solution and curing, and separating and removing the curing liquid,
It is manufactured by a manufacturing method including a step of externally adding a hydrophilic substance to the surface of the capsule after washing the hardening liquid remaining on the surface of the capsule with a by-product with ion-exchanged water.

The production of such capsules for cosmetics will be described more specifically. A 0.5 to 3 wt% aqueous solution of a metal alginate, ammonium alginate, etc., which is a capsule coating material, and a lipophilic substance, which is a core material, are: Each is transferred to the double nozzle via a metering pump connected to the storage tank. At this time, a tempner is provided between the pump and the nozzle in order to reduce the pulsation of the liquid transferred by the pump. Here, the balancer can reduce the pulsation of the transferred liquid by forming a shock absorbing air layer capable of absorbing the pulsation of the pump.

As the film-forming substance, an ionic polymer, that is, sodium alginate, potassium alginate, ammonium alginate, polyacrylic acid, carboxymethyl cellulose, ethylene-maleic anhydride copolymer, methyl vinyl ether-maleic anhydride copolymer, propylene. Examples thereof include maleic anhydride copolymers and vinyl acetate-maleic acid copolymers. However, the above-mentioned anionic polymer substances excluding the alginic acid alkali salt are difficult to form capsules, the film formation time is long, and the film strength is low, so that they are easily destroyed during the manufacturing process, and therefore, Not suitable as a coating material for cosmetic capsules.

Examples of the film-forming substance used in the present invention include at least one selected from sodium alginate, potassium alginate, and ammonium alginate.

Examples of the lipophilic substance that can be used as the core material in the present invention include liquid paraffin, liquid isoparaffin, squalane, glycerin trimyristate, cetyl octanoate, tri (capryl, capric acid) glycerin, methylpolysiloxane, cyclomethicone, and liquid lanolin. , Lanolin fatty acid isopropyl, isopropyl myristate, isopropyl palmitate, butyl stearate, apricot coat canel oil, wheat germ seed oil and the like.

In addition, evening primrose oil, squalene, tocopherol acetate, retinol palmitate, avocado oil, cottonseed oil, mink oil, castor oil, olive oil, jojoba oil, etc. are substances that act on the skin, but are easily oxidized, so
Although it has been difficult to add a large amount to the current cosmetics, the present invention has an antioxidant effect by encapsulating the above substances and enhances the stability of the product, which is highly effective on the skin. Cosmetics can be provided.

In the present invention, it is desirable to use one or more, and preferably two or more of such core oily substances.

The concentration of the aqueous solution of sodium alginate, potassium alginate, ammonium alginate or the like used as the coating material in the present invention is in the range of 0.5 to 3% by weight. If this concentration is less than 0.5% by weight, the capsule coating material becomes too thin and it becomes difficult to form capsules. On the other hand, if it exceeds 3% by weight, the viscosity of the alkali metal alginate aqueous solution becomes high, and it becomes difficult to transfer the coating material. Further, since the thickness of the capsule coating changes depending on the flow rate ratio between the core material and the coating material flowing out from the double nozzle, such conditions also affect the capsule formation. The preferred core material flow rate for capsule formation is 3.5-7.2 g / min, and the preferred coating material flow rate is 4.2-
6.5 g / min, and the flow ratio between such core material and coating material is 1
The range is /0.8 to 1 / 1.4. Under these conditions, capsule formation is good and the thickness of the film can be adjusted moderately. That is, the flow rate ratio of the core material and the coating material exceeds 1 / 0.8, that is, if the flow rate of the coating agent is less than 0.8, the formation of the coating becomes poor, encapsulation is difficult, and the coating tends to be too thin. If it is less than /1.4, the film becomes thicker and there is a problem in terms of rupture property, and the amount of the lipophilic substance encapsulated becomes relatively small, so that the capsule efficiency decreases.

In the encapsulation process, an aqueous solution of alkali metal alginate, ammonium alginate, etc. and a lipophilic substance are simultaneously transferred to the tip of the double nozzle, and the lipophilic substance as the core material is surrounded by the aqueous alginate solution as the coating material. Drops are formed. When the droplets are dropped into the aqueous solution of aluminum ions, they are hardened by the ionic bond between the alginate anions and the aluminum cations to form capsules. Here, as the curing liquid, aluminum chloride,
An aqueous solution of aluminum sulfate is used. The aluminum ion concentration of the hardening liquid is preferably in the range of 0.2 to 10% by weight. If the concentration of aluminum ions is less than 0.2% by weight, the curing speed will be slow and the strength of the coating will be weak, resulting in
If it exceeds 10% by weight, the curing rate is fast and the film strength is not affected, but the consumption of the polyvalent metal salt increases. During the process of hardening the capsule, the core material of the capsule is a lipophilic substance and has a low specific gravity, so the capsule floats on the surface of the hardening liquid. Therefore, it is preferable to gently stir the curable liquid during curing to uniformly cure the capsule film. In such curing process, the curing time is usually
30-40 minutes.

In the present invention, after such encapsulation process is completed,
As a filtering step, the capsule and the hardening liquid are filtered to remove the hardening liquid. Since the polyvalent metal aqueous solution, which is a hardening liquid, and by-products are present on the surface of the film of the filtered capsules, is removed by washing with deionized water.

Furthermore, in the present invention, a water-soluble polymer substance having hydrophilicity, a hydrophilic substance, or the like is added to the surface of the capsule in order to provide the skin with a moisturizing power when the capsule is used in cosmetics.

The hydrophilic substance or the like added to the surface of the capsule is called an external substance, and the amount of the external substance is preferably 6 to 30% by weight of the total amount of the final cosmetic product. Hydrophilic substances used externally include hyaltonic acid, collagen, glycerin, 1,3-butylene glycol, propylene glycol,
Ethanol, octadodecanol, sorbitol, polyethylene glycol, hydroxypropyl cellulose,
There are hydroxymethyl cellulose and the like. When an ionic polymer or the like is used as the water-soluble polymer substance, the polyvalent metal ion of the coating material and the ionic polymer substance are bound to each other and the capsules are aggregated. It is preferable to use.

In the present invention, it is preferable to use at least one kind of such a water-soluble polymer substance, preferably two or more kinds in combination.

The method of using the cosmetic capsule according to the present invention is to wrap the cosmetic capsule 1 to 2 g in a non-woven fabric and rupture it by hand, attach the capsule coating to the non-woven fabric, and apply a liquid component from the non-woven fabric to the skin. Can be mentioned. The non-woven fabric used at this time is preferably one made of various materials such as cellulose, polyester, polypropylene, polyethylene, nylon, viscose rayon and the like, and it is preferable that the non-woven fabric has a large number of holes.

As described above, when the cosmetic capsule of the present invention is used with a non-woven fabric, it is possible to supply to the skin a lipophilic substance and a hydrophilic substance having a moisturizing power, which are useful for the skin. You can also get a massage effect.

EFFECT OF THE INVENTION According to the cosmetic capsule and the method for producing the same according to the present invention, a core material made of a lipophilic substance capable of imparting activity to the skin and having excellent mixability and safety of cosmetics, and a suitable film. Efficiently providing a cosmetic capsule and a method for producing the same, in which a hydrophilic substance that gives moisturizing power to the skin is added to the outer shape of a capsule made of a strong and seamless spherical water-insoluble film material You can

〔Example〕

The present invention will be described below with reference to examples, but the present invention is not limited to these examples.

Example 1 1.8 g of sodium alginate was added to 98.2 g of ion-exchanged water with stirring to prepare a sodium alginate aqueous solution,
It was stored in a coating material storage tank. The core material of the capsule is
Castor oil 20 parts by weight, squalane 23 parts by weight, liquid lanolin
13 parts by weight, 27.5 parts by weight of cyclomethicone, 12 parts by weight of tocoflorum acetate, 4 parts by weight of evening primrose oil, and 0.5 parts by weight of retinol palmitate were mixed and prepared, and stored in a core material storage tank. When such a core material and a coating material were transferred to a double nozzle by a pump, the coating material flow rate was 4.3 g / min and the core material flow rate was 5.2 g / min. The droplets formed at the end of the nozzle were added dropwise to a 1% by weight aluminum sulfate aqueous solution while stirring, and were cured for 35 minutes to produce capsules having an average particle diameter of 4 mm.

Then, the hardened capsules were passed through a furnace to remove the hardened liquid, and washed with deionized water.

At this time, 50 g of a liquid discharged after the capsule was washed with water was collected, and a saturated aqueous solution of BaCl was added dropwise to wash with water until no white precipitate was deposited. The externals were then added to the water washed capsules. 32 parts by weight of glycerin, 13 parts by weight of propylene glycol, 7 parts by weight of octadecanol, 4 parts by weight of ethanol, 4 parts by weight of collagen, 3 parts by weight of hyaluronic acid, 0.5 parts of hydroxypropylene cellulose.
By mixing 3 parts by weight of ion-exchanged water and 36.5 parts by weight of ion-exchanged water, the external form was added to produce a capsule for cosmetics.

Example 2 A 2.5% by weight aqueous solution of sodium alginate and a 7% by weight aqueous solution of aluminum chloride were prepared as a hardening liquid. Capsule core materials include tri (capryl, capric acid) glycerin 22 parts by weight, squalane 26 parts by weight, avocado oil 25
Parts by weight, olive oil 18 parts by weight, evening primrose oil 5 parts by weight, and squalene 4 parts by weight were mixed and used. The core material and the coating material were transferred to a double nozzle to form droplets, which were then cured in an aluminum chloride aqueous solution to produce capsules.

At this time, the flow rate of the coating material was 6.8 g / min and the flow rate of the core material was 6.9 g / min, and capsules having a size of 1 to 3.5 mm could be manufactured. Next, the capsules for cosmetics were produced by the same method as in Example 1 after passing through a furnace and washing with water, and then adding the same external conditions as in Example 1.

Example 3 A 2.2% by weight aqueous solution of calcium alginate was prepared as a coating material and stored in a coating material storage tank. A 2% by weight aluminum chloride aqueous solution was prepared as a hardening liquid and stored in a hardening tank. Capsule core material is liquid lanolin 27 parts by weight, squalane 22 parts by weight, tocophenol acetate 14 parts by weight, cetyl octanoate 10 parts by weight, butyl stearate 12 parts by weight, isopropylene palmitate 8 parts by weight, mink oil. 7
Part by weight was mixed and prepared for use. The core material and the coating material were caused to flow under the same conditions as in Example 1 through a double nozzle, and the obtained droplets were cured with an aqueous solution of aluminum chloride, which is a curing liquid, and then subjected to a furnace filtration and water washing steps. Capsules were manufactured.

Next, as an external liquid, 13 parts by weight of glycerin, 0.7 parts by weight of hydroxyethyl cellulose, 9 parts by weight of octadodecanol, 12 parts by weight of 1,3-butylene glycol, 5 parts by weight of ethanol, and 60.3 parts by weight of ion-exchanged water were prepared by mixing. It was used. In the external condition adding step, 100 g of the capsule was mixed with 20 g of the external condition to produce a cosmetic capsule.

Example 4 2.5% by weight aqueous solution of potassium alginate was used as the coating material, 1.5% by weight aqueous solution of aluminum sulfate was used as the curing solution, the same core material as in Example 1 was used, and the average particle size was 4 mm under the same conditions as in Example 1. Capsules were manufactured.

Example 5 A 2.5% by weight aqueous solution of ammonium alginate was prepared and stored in a coating material storage tank. A 3% by weight aqueous solution of aluminum sulfate was used as the curing liquid, and the core material was glycerin trimyristate 25 parts by weight, cetyl octanoate.
21 parts by weight, 19 parts by weight of lanolin fatty acid isopropyl, 12 parts by weight of squalane, 8 parts by weight of wheat germ oil, 7 parts by weight of apricot coat canel oil, 4 parts by weight of squalene, 3 parts by weight of olive oil, 1 part by weight of evening primrose oil are mixed. I used it. The aqueous potassium alginate solution was set at a rate of 6.2 g / min, and the above core material was transferred at 3.8 g / min to a double nozzle to form droplets at the end of the nozzle. Droplets were dropped into an aqueous solution of aluminum sulfate, which is a curing liquid, and cured for 30 minutes to produce capsules having an average particle diameter of 3.5 mm.

The hardened capsule was filtered to remove the hardened liquid, washed with ion-exchanged water, and then filtered again. The external liquid was then added to the filtered capsules. Externally, glycerin
12 parts by weight, ethanol 7 parts by weight, propylene glycol 8 parts by weight, sorbitol polyethylene glycol 8 parts by weight, octadodecanol 2 parts by weight, hydroxypropylene cellulose 1 part by weight, hyaluronic acid 3 parts by weight, collagen 2 parts by weight, deionized water. 57 parts by weight were mixed and used. In the external condition adding step, the external condition was added by mixing 100 g of the capsule with 30 g of the external condition liquid to produce a capsule for cosmetics.

(Comparison test of film strength) In the same manner as in Example 1, the capsule of the present invention produced by dropping a droplet of an aqueous solution of sodium alginate surrounding a lipophilic substance into an aqueous solution of aluminum sulfate to cure the droplet, and the droplet of calcium chloride The capsule strength was compared with that of a capsule that had been dropped into an aqueous solution and cured. Rheometer for coating strength
meter).

Specifically, use a rod with a disk-shaped bottom surface at 2 cm / sec.
The capsule was gradually lowered at a constant speed to gradually push the capsule at a constant speed.

Then, the rod pushing the capsule receives a force, and this force is displayed on the measuring instrument. At this time, the force when the capsule was broken was measured and defined as the film strength. The obtained results are shown in Table 1. The following Table 1 is a value obtained by measuring and averaging 25 pieces of each of the above samples.

As shown in Table 1, the strength of the capsule film cured with an aqueous calcium chloride solution is 159.8 gf, and it is difficult to rupture the capsule by hand because the film strength is too high. However, the capsule of the present invention has a film strength of 18.0 g, which is easy to burst by hand and has a film strength advantageous for cosmetics.

Claims (6)

[Claims] 1. A lipophilic substance as a core material having a concentration of 0.5% by weight to
A makeup characterized by adding a hydrophilic substance to the surface of a liquid droplet, which is surrounded by a 3% by weight aqueous solution of alginic acid alkali salt, after being hardened with an aqueous solution of an aluminum salt having a concentration of 0.2% by weight to 10% by weight and washed with water. Capsules for food. 2. The capsule for cosmetics according to claim 1, wherein the alginic acid alkali salt is at least one selected from the group consisting of sodium alginate, potassium alginate, and ammonium alginate. 3. The capsule for cosmetics according to claim 1, wherein the aluminum salt is at least one selected from the group consisting of aluminum chloride and aluminum sulfate. 4. The lipophilic substance is liquid paraffin, liquid isoparaffin, squalane, glycerin trimyristate, cetyl octanoate, tri (capryl, capric acid) glycerin, methylpolysiloxane, cyclomethicone, liquid lanolin, lanolin fatty acid. Isopropyl, isopropyl myristate, isopropyl palmitate,
2 selected from the group consisting of butyl stearate, apricot canel oil, wheat germ oil, evening primrose oil, squalene, tocopherol acetate, retinol palmitate, avocado oil, cottonseed oil, mink oil, castor oil, olive oil, jojoba oil 2 The capsule for cosmetics according to claim 1, wherein one or more kinds are mixed and used. 5. The hydrophilic substance is hyaluronic acid, collagen, glycerin, 1,3-butylene glycol, propylene glycol, ethanol, octadodecanol, sorbitol, polyethylene glycol, hydroxypropyl cellulose, hydroxyethyl cellulose, hydroxymethylpropyl cellulose. The capsule for cosmetics according to claim 1, which is a mixture of two or more kinds selected from the group consisting of :, hydroxymethyl cellulose. 6. Droplets obtained by passing an aqueous alginic acid alkali salt aqueous solution having a concentration of 0.5% by weight to 3% by weight and a lipophilic substance through a double nozzle so that the alkaline alginic acid aqueous solution surrounds the lipophilic substance. Is prepared, the droplets are cured with an aqueous solution of aluminum ions to form capsules, the capsules are washed with ion-exchanged water, and then a hydrophilic substance is added to the capsule surface. Manufacturing method.