JPH03109312A - Capsule for cosmetic application and method of its production - Google Patents

Abstract

PURPOSE: To obtain the subject capsule controlled in coating film strength and water insolubility by curing a liquid drop prepared by surrounding a lipophilic substance of core material with an alkali metal alginate salt aqueous solution of specific concentration, washing the cured liquid drop with water, and subsequently adding a hydrophilic substance to the surface of the drop. CONSTITUTION: This capsule for cosmetic is obtained by surrounding an lipophilic substance of core material with a 0.5-3wt.% alkali metal alginate salt (e.g. Na salt and/or NH4 salt) aqueous solution, curing the obtained liquid drop with an aluminum salt [e.g. AlCl3 and/or Al3 (SO4 )3 ] aqueous solution having a concentration of 0.2-10wt.%, washing the cured liquid drop with water, and subsequently adding a hydrophilic substance to the surface of the washed drop. The capsule can thus efficiently be obtained. The obtained capsule can give activities to skins, comprises the core material comprising a lipophilic substance excellent in safety and compatibility with the cosmetic and a seamless, spherical and water-insoluble coating film material having a proper coating film strength, and contains the hydrophilic substance capable of giving moisture retainability to skins in the outer coating film of the capsule.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention is directed to the use of aluminum alginate as a coating material to adjust the coating strength and water insolubility, and to coat the capsule surface with a lipophilic substance beneficial to the skin incorporated within the coating. The present invention relates to a cosmetic capsule containing a hydrophilic substance and a method for producing the same.

BACKGROUND OF THE INVENTION At present, there are various types of capsules commercially available for boat fishing, including hard capsules, soft capsules, and seamless capsules. The coating material of soft capsules is made of gelatin or the like, and because the coating is thick and hard, it is difficult to easily rupture the capsule by hand, and a special instrument is required to rupture the capsule.

In addition, seamless capsules are made by transporting the shell material and core material of the capsule through double nozzles, creating a jet flow of the film material and core material at the end of the double nozzle, and at the tip of this jet flow, surface tension The coating material forms droplets surrounding the core material, and the droplets are then dropped into a curing liquid or a cooling liquid. These capsules are formed by a double nozzle dropping method that applies an in-liquid curing coating method, and it is known that due to the principle of the manufacturing process, the particles are spherical and have excellent fluidity and filling properties. 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 and cured. However, capsules made by hardening sodium alginate with calcium chloride have too high a film strength, so there is a problem in that they are difficult to burst when used as cosmetics. In addition, when a seamless capsule using a film material obtained by dropping droplets of an aqueous gelatin solution into a cooling liquid and curing it is applied to cosmetics, gelatin The film will be dissolved.

Therefore, when applying such a seamless capsule to cosmetics, the capsule is used after being ruptured, so the strength of the film at which the capsule ruptures must be appropriately adjusted.
When a hydrophilic substance is added to the outer surface of the capsule, the capsule film must not be dissolved by the hydrophilic substance and the capsule form must not be deformed.

On the other hand, lipophilic substances can be mentioned as substances that are particularly active on the skin, and lipophilic substances are currently widely used in the production of cosmetics. However, many of these lipophilic substances are oxidized when they come into contact with air, which poses problems in the stability of cosmetics, making it difficult to incorporate large amounts into cosmetics, and some substances cannot be incorporated at all.

OBJECT OF THE INVENTION The present invention aims to solve the problems associated with the prior art, and provides a core made of a lipophilic substance that is able to impart activity to the skin and has excellent blendability and safety in cosmetics. and a seamless spherical water-insoluble film material having appropriate film strength, and a capsule for cosmetics comprising a hydrophilic substance that imparts moisturizing power to the skin added to the outer surface of the capsule, and a method for producing the same. is intended to provide.

Summary of the Invention The cosmetic capsule according to the present invention comprises liquid droplets in which a lipophilic substance as a core material is surrounded by an alginate alkali salt aqueous solution having a concentration of 0.2% by weight to 3% by weight.
It is characterized in that it is cured with an aqueous aluminum salt solution of 10% by weight and 96%, washed with water, and then a hydrophilic substance is added to its surface.

The method for producing capsules for cosmetics according to the present invention has a concentration of 0.
By passing an alginate alkali salt aqueous solution of 5 96 to 3 96 by weight and a lipophilic substance through a double nozzle,
A droplet is prepared so that the alginate aqueous solution surrounds the lipophilic substance, the droplet is hardened with an aqueous aluminum ion solution to form a capsule, the capsule is washed with ion-exchanged water, and then the capsule is It is characterized by adding a hydrophilic substance to the surface.

According to the cosmetic capsule and the manufacturing method thereof according to the present invention, a core material made of a lipophilic substance is covered with a seamless spherical water-insoluble film material having an appropriate film strength, and the outer shape of the capsule is It is possible to provide a capsule for cosmetics to which a hydrophilic substance that provides moisturizing power to the skin is added.

Detailed Description of the Invention The capsule for cosmetics according to the present invention can be easily produced by transferring an aqueous solution of an alkali metal salt of alginate or ammonium alginate and a lipophilic substance to the tip of a double nozzle. An encapsulation process involves preparing droplets in which a salt aqueous solution surrounds a lipophilic substance, dropping these droplets onto a hardening solution of a polyvalent metal ion aqueous solution, and hardening the solution. After washing the remaining hardening liquid and by-products with ion-exchanged water, the capsule is manufactured by a manufacturing method including an external addition step of adding a hydrophilic substance to the surface of the capsule.

To explain the production of such cosmetic capsules in more detail, the capsule coating material, such as alginate metal salt, alginate ammonium salt, etc., has a weight of 0.5 to 3.
The aqueous solution and the lipophilic substance as the core material are transferred to the dual nozzle through metering pumps connected to storage tanks, respectively. At this time, a tensioner is provided between the pump and the nozzle to reduce pulsation of the liquid transferred by the pump. Here, the tenbunner can reduce the pulsation of the liquid being transferred by forming an impingement-absorbing air layer that can absorb the pulsation caused by the pump.

Film-forming substances include ionic polymers such as sodium alginate, potassium alginate, ammonium alginate, polyacrylic acid, carboxymethylcellulose, ethylene-maleic anhydride copolymer, methyl vinyl ether-maleic anhydride copolymer, propylene Examples include -maleic anhydride copolymers, vinyl acetate-maleic acid copolymers, and the like. However, with the above-mentioned anionic polymeric substances other than alginate alkali salts, it is 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. It is not suitable as a coating material for cosmetic capsules.

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

Lipophilic substances that can be used as core materials in the present invention include liquid paraffin, liquid isoparaffin, squalane, glyceryl trimyristate, cetyl octanoate, tri(caprylic, capric) glycerin, methylpolysiloxane, cyclomethicone, liquid lanolin. , lanolin fatty acid isopropyl, isopropyl myristate, isopropyl palmitate, butyl stearate, apricot kernel oil, wheat germ oil, etc.

In addition, substances such as evening primrose oil, squalene, tocopherol acetate, retinol balmitate, avocado oil, cottonseed oil, mink oil, castor oil, olive oil, and jojoba oil are active on the skin, but they are easily oxidized, so However, in the present invention, by encapsulating the above-mentioned substances, it has been difficult to incorporate them in large amounts into cosmetics, which has an antioxidant effect, improves the stability of the product, and has many effects on the skin. Cosmetics can be provided.

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

The aqueous solution of sodium alginate, potassium alginate, ammonium alginate, etc. used as a coating material in the present invention has a concentration in the range of 0.5 to 3% by weight. When this concentration is less than 0.5% by weight, the capsule coating material becomes too thin, making it difficult to form capsules. Also 3% by weight
If the alkali metal alginate aqueous solution has a high viscosity, it becomes difficult to transfer the coating material.Also, depending on the flow rate ratio of the core material and coating material flowing out from the double nozzle, the thickness of the capsule coating will increase. These conditions also affect capsule formation, as the core material flow rate is 3.5 to 7.2 g/min and the preferred coating material flow rate is 4.2 to 6.5 g/min for capsule formation. /min, and the flow rate ratio between the core material and the coating material is in the range of 110.8 to 1/1.4.Under these conditions, capsule formation is good and the coating thickness can be adjusted appropriately. That is, the flow rate ratio of the core material and the coating material exceeds 110.8, that is, the flow rate of the coating material is 0.
．． If it is less than 8, the film formation will be poor, encapsulation will be difficult, and the film will tend to be too thin.
When it is less than 4, the film becomes thick, which causes problems in terms of rupture, and the amount of encapsulated lipophilic substance becomes relatively small, resulting in a decrease in encapsulation efficiency.

In the encapsulation process, an aqueous solution such as alkali metal alginate or ammonium alginate and a lipophilic substance are simultaneously transferred to the tip of a double nozzle, and the core material, the lipophilic substance, is surrounded by the alginate aqueous solution, which is the coating material. Droplets are formed. When this droplet is dropped into an aqueous aluminum ion solution, it is hardened by ionic bonding between alginate anions and aluminum cations, forming a capsule. Here, the curing liquid includes aluminum chloride,
An aqueous solution of aluminum sulfate is used. The aluminum ion concentration of the curing liquid is preferably in the range of 0.2 to 10% by weight. The concentration of aluminum ions is 0.2 weight 9
If the concentration is less than 6, the curing speed will be slow and the strength of the film will be weak; if the concentration exceeds 10% by weight, the curing speed will be fast and the film strength will not be affected, but the amount of polyvalent metal salt consumed will be large. Become. During the process of curing the capsules, the core material of the capsules is a lipophilic substance and has a low specific gravity, so the capsules float to the surface of the curing liquid. Therefore, during curing, it is preferable to gently stir the curing liquid to uniformly cure the capsule film. In such a curing process, the curing time is typically 30 to 40 minutes.

In the present invention, after such an encapsulation step is completed,
In the filtration step, the capsules and the hardening liquid are filtered to remove the hardening liquid. Since the polyvalent metal aqueous solution and by-products, which are the hardening liquid, are present on the membrane surface of the filtered capsules, they are removed by washing with ion-exchanged water.

Further, in the present invention, in order to impart moisturizing power to the skin when the capsule is used in cosmetics, a water-soluble polymeric substance, a hydrophilic substance, etc. having a moisturizing power is added to the surface of the capsule.

Hydrophilic substances, etc. added to the capsule surface are called external substances, and the amount of external substances is 6 to 30% of the total amount of the final cosmetic product.
Preferably, it is % by weight. Hydrophilic substances used as the external material include hyaltonic acid, collagen, glycerin, 1,3-butylene glycol, propylene glycol, ethanol, octadecanol, sorbitol, polyethylene glycol, hydroxypropylcellulose, hydroxymethylcellulose, and the like. When using ionic polymers among the water-soluble polymer substances, the polyvalent metal ions of the coating material and the ionic polymer substances bond with each other and the capsules aggregate, so a relatively small amount of It is preferable to use

In the present invention, it is preferable to use at least one type of such water-soluble polymeric substances, preferably a mixture of two or more types.

A method for using the cosmetic capsules according to the present invention is to wrap 1 to 2 g of cosmetic capsules in a nonwoven fabric and rupture them by hand.
A method may be mentioned in which a capsule film is attached to a nonwoven fabric and a liquid component is applied to the skin from the nonwoven fabric. The nonwoven fabric used in this case is preferably one made of various materials such as cellulose, polyester, polypropylene, polyethylene, nylon, viscose rayon, etc. It is preferable that the nonwoven fabric has a large number of holes.

In this way, when the capsule for cosmetics of the present invention is used with a non-woven fabric, it is possible not only to supply the skin with a lipophilic substance useful for the skin and a hydrophilic substance with a moisturizing ability, but also to improve the ability of the non-woven fabric to moisturize the skin. You can also get a pine surge effect.

Effects of the Invention According to the capsule for cosmetics and the manufacturing method thereof according to the present invention, a core material made of a lipophilic substance that can give activity to the skin and is excellent in blendability and safety in cosmetics, and an appropriate film. To efficiently provide a capsule for cosmetics comprising a strong, seamless spherical water-insoluble film material and a hydrophilic substance imparting moisturizing power to the skin added to the outer surface of the capsule, and a method for producing the same. I can do it.

〔Example〕

EXAMPLES The present invention will be explained below with reference to Examples, but the present invention is not limited to these Examples.

Example 1 1.8 g of sodium alginate in 98.2 g of ion-exchanged water
g was added with stirring to prepare an aqueous sodium alginate solution, which was stored in a coating material storage tank. The core material of the capsule is 20 parts by weight of castor oil, 23 parts by weight of squalane,
13 parts by weight of liquid lanolin, 27.5 parts by weight of cyclomethicone, 12 parts by weight of tocoflor acetate, 4 parts by weight of evening primrose oil,
It was prepared by mixing 0.5 parts by weight of retinol rumitate and stored in a core material storage tank. The core material and film material were transferred to a double nozzle using a pump, and at this time, the flow rate of the film phase was 4.3 g/min and the flow rate of the core material was 5.2 g/min. Droplets formed at the end of the nozzle are washed with aluminum sulfate 4
Capsules having an average particle size of 4 mm were manufactured by dropping the mixture into a wt % aqueous solution with stirring and curing for 35 minutes.

The cured capsules were then filtered to remove the cured liquid and washed with ion-exchanged water.

At this time, 50 g of the liquid discharged after the capsules were washed with water was collected, and a BaCl saturated aqueous solution was added dropwise thereto.The capsules were washed with water until no white precipitate was deposited.Next, the outer shell was added to the washed capsules. External composition: 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 by weight of hydroxypropylene cellulose, 36 parts by weight of ion-exchanged water. A cosmetic capsule was prepared by mixing 0.5 parts by weight and adding this outer form.

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

At this time, the flow rate of the coating material was 6.3 g/min, and the flow rate of the core material was 6.3 g/min.
．． At a rate of 9 g/min, capsules with a size of 1 to 3.5 cities could be produced. Next, after filtration and washing with water in the same manner as in Example 1, the same external form as in Example 1 was added to produce cosmetic capsules.

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 aqueous solution of aluminum chloride was prepared as a curing solution and stored in a curing tank. The core material of the capsule is 27 parts by weight of liquid lanolin, 22 parts by weight of squalane, 14 parts by weight of tocopherol acetate, 10 parts by weight of cetyl octanoate,
It was prepared and used by mixing 12 parts by weight of butyl stearate, 8 parts by weight of isopropylene palmitate, and 7 parts by weight of mink oil.

The core material material and the coating material are flowed through a double nozzle under the same conditions as in Example 1, and the resulting droplets are cured with an aqueous aluminum chloride solution, which is a curing liquid, and then filtered and washed with water to form capsules. was 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-''j-ethylene glycol, 5 parts by weight of ethanol, and 60.3 parts by weight of ion-exchanged water. It was prepared and used by mixing parts by weight.In the external addition step, 10 capsules were mixed.
Cosmetic capsules were prepared by mixing 0 g of the outer layer with 20 g of the outer layer.

Example 4 A 2.5% by weight aqueous solution of potassium alginate was used as the coating material, and 1.596 tf of aluminum sulfate was used as the curing liquid!
Capsules with an average particle size of 4 mm were manufactured using the L aqueous solution and the same core material as in Example 1 under the same conditions as in Example 1.

Example 5 A 2.5% by weight aqueous solution of ammonium alginate was prepared and stored in a coating material storage tank. A triple aluminum sulfate FF196 aqueous solution was used as the curing liquid, and the core materials were 25 parts by weight of glycerin trimyristate, 21 parts by weight of cetyl octanoate, and 1 part by weight of isopropyl lanolin fatty acid.
A mixture of 9 parts by weight, 12 parts by weight of squalane, 8 parts by weight of wheat embryo seed oil, 7 parts by weight of apricot kernel oil, 4 parts by weight of squalene, 3 parts by weight of olive oil, and 1 part by weight of evening primrose oil was used. The potassium alginate aqueous solution was set at a rate of 6.2 g, and the core material was transferred to a double nozzle at a rate of 3.8 g to form droplets at the end of the middle nozzle. By dropping the droplets into an aluminum sulfate aqueous solution, which is a curing liquid, and curing them for 30 minutes, the average particle size was reduced to 3.5.
Capsules of mm were manufactured.

The hardened capsules were filtered to remove the hardening liquid, washed with ion-exchanged water, and then filtered again. The external liquid was then added to the filtered capsules. Externally, 12 parts by weight of glycerin, 7 parts by weight of ethanol, 8 parts by weight of propylene glycol, 8 parts by weight of sorbitol polyethylene glycol, 2 parts by weight of octadodecanol, 1 part by weight of hydroxypropylene cellulose, 3 parts by weight of hyaluronic acid, 2 parts by weight of collagen. parts by weight and 57 parts by weight of ion-exchanged water were used. In the external liquid addition process, 30 external liquid is added to 100 g of capsules.
Cosmetic capsules were manufactured by mixing the ingredients in a proportion of 1.5 g and adding an outer layer.

(Comparative test of film strength) Capsules of the present invention were produced by dropping and curing droplets of an aqueous solution of thorium alginate surrounding a lipophilic substance into an aqueous solution of aluminum sulfate in the same manner as in Example 1; The film strength was compared with capsules that were cured by dropping them into a calcium aqueous solution. Film strength is measured using a rheometer (Rh
eometer).

Specifically, a rod whose bottom surface has a disk shape is 2 cm/
The capsule was gradually pushed at a constant speed by descending at a speed of .

The rod pushing the capsule will then experience a force, and this force will be displayed on the instrument. At this time, the force when the capsule was broken was measured and determined as the film strength.

The obtained results are shown in Table 1. Table 1 below is the average value obtained by measuring 25 of each of the above samples.

Table 1 As shown in Table 1, the strength of the capsule film hardened using an aqueous calcium chloride solution was 159.8 g, and the film strength was so high that it was difficult to easily rupture the capsule by hand. be. However, the capsule of the present invention has a film strength of 18.02 times, which is easy to burst by hand, and has a film strength that is advantageous for cosmetic use.

Claims (1)

[Scope of Claims] (1) Droplets surrounding a lipophilic substance as a core material with an aqueous alginate salt aqueous solution having a concentration of 0.5% to 3% by weight are A cosmetic capsule characterized in that a hydrophilic substance is added to the surface of the capsule after hardening with an aqueous aluminum salt solution and washing with water. (2) The cosmetic capsule according to claim 1, wherein the alginate alkali salt is at least one selected from the group consisting of sodium alginate, potassium alginate, and ammonium alginate. (3) The cosmetic capsule 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, glyceryl trimyristate, cetyl octanoate, tri(caprylic, capric) glycerin, methylpolysiloxane, cyclomethicone, liquid lanolin, isopropyl lanolin fatty acid, isopropyl myristate, isopropyl palmitate, butyl stearate, Apricotcannel oil, wheat germ oil, evening primrose oil, squalene, tocopherol acetate, retinol palmitate, avocado oil, cottonseed oil,
The capsule for cosmetics according to claim 1, characterized in that two or more selected from the group consisting of mink oil, castor oil, olive oil, and jojoba oil are used in combination. (5) The hydrophilic substance is hyaluronic acid, collagen,
A mixture of two or more selected from the group consisting of glycerin, 1,3-butylene glycol, propylene glycol, ethanol, octadecanol, sorbitol, polyethylene glycol, hydroxypropylcellulose, hydroxyethylcellulose, hydroxymethylpropylcellulose, and hydroxymethylcellulose. The capsule for cosmetics according to claim 1, characterized in that: (6) Droplets are formed by passing an aqueous alginate salt aqueous solution having a concentration of 0.5% to 3% by weight and a lipophilic substance through a double nozzle so that the alginate aqueous solution surrounds the lipophilic substance. A capsule for cosmetics, characterized in that the droplets are hardened 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 capsule surface. manufacturing method.