JPS62263112A - Skin cosmetic containing colorant microcapsule comprising shellac as wall membrane material - Google Patents

Abstract

PURPOSE:A skin cosmetic having improved safety, stability, cleaning properties, etc., without damaging characteristic purposes of colorant, obtained by blending a skin cosmetic with colorant microcapsule comprising shellac as a wall membrane material obtained by spray drying granulator. CONSTITUTION:A skin cosmetic containing microcapsules which are made into microcapsules by the use of a spray drying granulator having the simplest operation, comprise shellac as a wall membrane material and a colorant (organic inorganic pigment or dyestuff such as tar dyestuff, natural dyestuff, etc.) as a core substance and have 5-20 micron average particle diameter. Since the microcapsules have no aggregation between the particles and provide good dispersion into water and oil agent, a used cosmetic is extremely readily washed away. Since the colorant has improved light resistance and heat resistance, materials which could not used with respect to stability can be added to cosmetic. Since the membrane is further transparent and lustrous, the cosmetic has merits of further clearer color, etc.

Description

[Detailed Description of the Invention] [A] Object of the Invention The present invention provides a novel application of microcapsules or matrix granules of colorants (pigment particles) covered with a shell film to skin cosmetics. Regarding.

(Prior Art) Microcapsules obtained by using a spray drying granulator using Shella as a wall film and a coloring agent as a core material have never been found in the past.

Hirani is used for skin cosmetics, and Nerac is used as a wall membrane material.
There are also examples of coloring agents using J capsules in cosmetics.
I couldn't find anything else.

(Problems to be Solved by the Invention) Various pigments are used in cosmetics. Typical examples include various organic and inorganic pigments, tar-based pigments, and natural animal and vegetable colors.

However, toxicity due to percutaneous absorption through the skin, skin irritation,
Due to safety concerns such as skin allergies, there are only a limited number of dyes that can actually be used.

Furthermore, in general, inorganic and organic ingredients have light resistance,
Although it has solvent resistance, its stability depends on the p)l of the system in the formulation. For example, ultramarine blue is very unstable in an acidic region, and over time, cosmetics Loss of color and generation of hydrogen sulfide odor may be observed after blending. Therefore, it is known as one of the colorants that is difficult to use as a filler in formulated cosmetics in the acidic region.

On the other hand, tar-based pigments have poor durability and tend to bleed due to oils, etc., and when they come into contact with the skin or mucous membranes, they tend to penetrate and remain in the skin's sweat glands, sebaceous glands, and hair roots (pores). Not good for health.

In other words, some pigments that have good adsorption to the skin epidermis are
There are some things that are difficult to remove even after washing your face (1 liter).

The use of pigments in cosmetics enhances the image of the product.
In addition, there are products used in make-up products such as lipstick, blusher, and eyebrow tint, but when adding pigments to these products, considerations such as uniformity of hue, concealment, and youth-absorbing ability on the skin must be taken into account. In order to improve performance, for example, pigments are required to be finely divided. However, as pulverization progresses, on the other hand, secondary agglomeration effects between powder particles and adhesion within the m structure of the epidermis (sebaceous glands, hair roots, sweat glands) as described in the previous section, As its persistence has increased, there has been a need for the best possible solution for its use.

The present invention solves this problem by using the known methods.
Among the microencapsulation techniques, we use a spray drying granulator, which is the simplest and has the best operability.
I tried to solve this problem. That is, the main part of the present invention is that the pigment is wrapped in a small membrane material so that the pigment can be incorporated into the product without coming into direct contact with the skin, and at the same time, the pigment used is the original purpose of the product. For example, to solve the problem of blushing, we started experimenting with various materials to find out what kind of wall material should be used to bring the pigment, which is the core substance, into the skin.

The conditions for solving the final problem are (1) that the wall film material can be used for a wide variety of pigments, and (2) that the wall film material does not permeate into the skin tissue. In addition, it is easy to clean, (31! The membrane material itself has no toxicity such as skin irritation, (4) no aggregation occurs between wall membrane particles, and (5) good dispersion in water and oil. To demonstrate one's sexuality.

(6) Stabilization of various physical properties such as light resistance, heat resistance, and pH resistance of the dye that can be encapsulated.

We focused our research on the points mentioned above. As a result, it was discovered that Nera 7li is the best wall membrane material when a spray drying granulator is used, leading to the present invention.

Shella 7li is a natural resin that is thermosetting, and is known to have excellent water and oil resistance.
It has been widely used as a binding agent in the processing of foods, confectionery, etc., and as a coating material for polishing the surface of tablets.

[Explanation] Structure of the Invention The present invention is a microencapsulation method, and uses a spray drying granulator, which is the simplest to operate, to produce a membrane material for microcapsules in a nano The main purpose of this technology is to use microcapsules whose core substance is a coloring agent (pigment) in cosmetics.

Below, in order to show it more specifically, it will be described in more detail in Examples, but without being limited to the pigments shown in Examples, the core substance can be dispersed in the system (shellac solution). If so, all other dyes and other substances can be microencapsulated.

In addition, those that do not disperse but dissolve in the system are
It can be obtained as matrix-like fine particles. or,
All of the microcapsules and matrix-like fine particles according to the present invention are formed in a true spherical shape. Therefore, matrix-like fine particles can also be used depending on cosmetics and other uses.

(A) Microencapsulation method 1 Example - 1゜Safflower extract cursamine 200& is dispersed in 5% aqueous shellac solution 11, and 70% is granulated by normal operation using a known spray drying granulation device. I got something.

The particle size distribution of the obtained granules was as shown in FIG.

That is, the diameter of the particles becomes finer as the atomizer rotation speed increases.

Moreover, the obtained wall film of fine grains can be composed of shellac, and moreover, the film forms a transparent film.

Example 1-2J Aqueous solutions 1e containing 2%, 5%, and 10% of aqueous shellac were prepared in advance, and finely ground ultramarine of 10 microns or less was stirred into each aqueous solution. The mixture is dispersed and granulated using a spray drying granulator at an atomizer rotation speed of 25.00 rpm.

The obtained ultramarine microcapsules are all obtained as fine particles of 50 microns or less.

In addition, the obtained ultramarine microcapsules did not lose their color even when dilute hydrochloric acid was added, and no hydrogen sulfide generation was observed, as stated in the ultramarine confirmation test written in the cosmetic primordium. There wasn't.

"Example-3" Based on the above-mentioned 1 implementation (RI 1-1. to 1 implementation A-2),
Each of the pigments shown in the following section (Table 1) was dispersed in the aqueous solution of Nethic, and all of them were made into fine microcapsules using a spray drying granulator. Microcapsules can be manufactured according to the purpose of use of the core material by arbitrarily adjusting the concentration of NELAC in the aqueous solution used as the wall film material and the rotational speed of the atomizer.

(Table 1) Core substances used in Example 3 (Notes) All of the substances in Examples 1 to 2 and the wood surface (Table 1) can be obtained as spherical microcapsules. However, all the substances that are soluble in the NELAC solution are obtained as spherical fine particles in a matrix state.

(B) Formulation method (prescription example) 1 Prescription example-1 = Stick-shaped blusher (Hohobeni) j Kaolin... 20.0 (
%)titanium dioxide ················
・4.0 Carsamine microcapsules (obtained in Example-1)・・・・・・・・・・・・・・・1
．． 0 Kyan Deli La Row・・・・・・・・・・・・・1
2,0 selenium ・・・・・・・・・・・・・・・
・5.0 carnauba wax・・・・・・・・・・・・・・・
・・・3.0 Squalane・・・・・・・・・・・・・・・
・・・・・・22.0 Isopropyl myristate ester・15,0 Isostearyl alcohol・・・・
...15.0 shea butter (Bioderma SX-19)
・3.0 Fragrance... ・ ・・・ ・・・・・・・・・
・Appropriate amount When formulating the above formulation, add kaolin, titanium dioxide, and casamine to a portion of the squalane and knead it. Next, mix with the other ingredients, heat and melt, and then add the colorant part. In addition, the mixture was uniformly dispersed using a homomixer and filled into a stick-shaped container.

Separately, a cream-like blush was prepared using Cursamine, which had not been microencapsulated, and was added to the above formulation.

Even when using un-microencapsulated cursamine and micro-encapsulated cursamine, a good blush with no uneven color can be obtained in both cases. Looking at (stability performance), products that use (blended) non-microencapsulated cursamine change color in about 3 days,
This led to a decline in product value.

In contrast, no discoloration was observed with microencapsulated cursamine.

On the other hand, in a wiping test using the face, attempts were made to cleanse using a cleansing cream with a known formulation or to cleanse using a cosmetic stone age, but in the case of using microencapsulated cursamine, the cleansing cream was used alone. However, when using a product containing non-microencapsulated Cursamine, it was necessary to wash with cosmetic soap to remove it when using only a cleansing cream.

1 Formulation example-2 Nistic type eye shadow' Ultramarine microcapsules (obtained in Example-2)...
・・・・・・・・・・・・・・・12.0. (%) Talc・・・・・・・・・・・・・・・・・・・・・
5.0 Titanium dioxide・・・・・・・・・・・・・・・
・・・3.0 bar jll n・・・・・・・・・・・・
・・・・・・・・・18.0 Carnauba Rou・・・・・・
・・・・・・・・・・・・10.0 Solid paraffin ・
・・・・・・・・・・・・・・・5.0 squalane...
・・・・ ・・・・・・・・・・21.0 Glyceryl trisethylhexanoate ・−・・
・・・・・・・・・・・・・・・・・・2 0.0n rubitan sesquioleate・・・・・・・・・・・・・・・・・・・・・・・・
・・・1.0 Fragrance ・・・ ・・・ ・・・・・・・・・
...Appropriate amount The formulation of the above formulation includes ultramarine blue, talc, titanium nitride, pearl pigment, and a portion of squalane.
Add lupitan sesquioleate and process with a kneader. The other ingredients in the formulation were mixed with this, heated and dissolved, and were gradually added to allow uniform dispersion using a homomixer. After dispersion, the mixture was filled into a container and rapidly cooled.

In the above formulation, the microencapsulated ultramarine blue was replaced with a non-microencapsulated ultramarine blue, and the same procedure was repeated.

When ultramarine microcapsules are blended, the microcapsules are hard particles during the manufacturing process, so they are hardly destroyed, and the hue also changes.
The color unevenness was also the same as when using conventional ultramarine. However, it was easy to wipe off, similar to the previous Cursamine microcapsules, and the color tone was stable over a long period of time.

rs Prescription Example 3=Foundation'' Microcapsules were obtained using Shella 7li as the wall material and tar-based pigment: Red No. 202 according to Examples 1 to 3, and foundation was prepared according to the following formulation. was manufactured.

(1) Stearic acid ・・・・・・・・・・・・1.
0 (%) (2) M row ・・・・・・・・・・・・・・・
...3.0 (3) Behenyl alcohol...
・・・・・・・・・0.6(4) Flesterin ・・・・・・
・・・・・・・・・・・・0.2(5) Squalane・・
・・・・・・・・・・・・・・・3.0(6) Octerdodenyl myrisdate ・7.0(7) Self-emulsifying glyceryl monostearate ・・・・
・・・・・・・・・・・・・・2.0(8) Monostearin-derived polyethylene glyfur・・・・・・・・・・・・・
・ ・ ・・・・・・・1.0 (9) Butyl roseoxybenzoate ・・・・0.1 (1G>lecithin ・−・
・・・・・・・・・・・・0.6(11) Glycerin・
......7.0 (12) Methyl paraoxybenzoate ...0.3 (13) Purified water...
・・・・・・・・・・・・61.95(14) Sodium metaphosphate・・・・・・・・・0.05(15
) red 20, . No. 2 microcapsule...5.0 (16
) Talc・・・・・・・・・・・・・・・・・・・・・
・・・7.0(17) Fragrance・・・・・・・・・・・・・
......0.1 The ingredients (1) to (10) above are mixed, heated and dissolved, and the mixture of (11) to (16) is added and emulsified, then the temperature is lowered to 60℃. Then, (17) was added and cooled to prepare a foundation.

The resulting foundation retains a uniform hue and
No change was observed in a stability test conducted at 40° C. and 75% humidity for one month.

The following table (Table 2) summarizes the evaluation (effect) of each product shown in the formulation example using the microcapsules of each pigment obtained in the example.

(Table 2) Evaluation of microencapsulated pigment [C] Effect of the invention The pigment microcapsules obtained by using the shellac of the present invention as a wall film and using a spray drying granulator are characterized by an average particle size of 5. It is possible to obtain fine particles of about 20 microns.

Ultra-fine particles are required for pigments, and as a result,
It has improved uniformity of hue, improved hiding power, and adhesion to the skin epidermis. However, as the micronization progresses, there are concerns about residual effects due to secondary agglomeration between powder particles, adhesion into skin tissue, penetration, etc. The pigment microcapsules have no aggregation between particles, and are resistant to water and oil.
A great advantage is that good dispersion is obtained and therefore it is very easy to wash off the cosmetics used.

In addition, light resistance and heat resistance are improved.
This is a big advantage.

Therefore, conventionally, pigments extracted from various animals and plants, which are highly safe and have mild pharmacological effects, have no effect on light resistance, heat resistance, pH, metal ions, etc. Many of these pigments have been difficult to incorporate into cosmetics due to their stability. This is particularly advantageous.

On the other hand, since perfumes and other oils and fats are often used in cosmetics, for example, in the case of organic pigments that are blended into powders and foundations, these substances and pigments interact with each other. This may cause bleeding.

In such cases, the microencapsulated core material in the shellac wall membrane material is not brought into direct contact with the other ingredients in the formulation, and the shellac wall membrane material is highly resistant to solvents and Since it has good dispersibility, it is superior to other ingredients that can be blended in from the viewpoint of formulation.

Of course, the core pigment, which is coated with a shellac wall film, is not affected by other ingredients in the formulation, so the original color of the pigment can be maintained without deterioration.

In other words, the microcapsules coated with a wall film material are transparent and shiny, retaining the original colors of the various pigments contained therein, and allowing the pigments to float freely. Because a glossy film is formed on the surface of the pigment, when added to the formulation of cosmetics, the color becomes much more vivid than when simply adding pigments. It is.

To describe this effect in more detail,
For example, an example of the above-mentioned microencapsulation method (A)-
The microcapsules of cursamine obtained in 1 are as follows.

(a) Sierra 7li forms a transparent wall film and does not impair the original color tone of Cursamine.

(b) Because it forms a water-resistant and oil-resistant wall film, the drawbacks of the water and oil resistance of the core material, cursamine, are completely eliminated, and even when incorporated into cosmetic formulations, the color does not change. No change over time or bleeding.

(c) The shell film itself becomes a wall film, and due to the ultraviolet absorption property provided by this, the light resistance of cursamine is improved, and discoloration change due to ultraviolet rays can be suppressed.

As mentioned above, (a) to (c) are desirable advantages not limited to Cursamine but common to other color chips. In addition, the advantages of the pigmented shellac wall coating material of the present invention are optimal when used in the following cases.

(d) Core substance (coloring power), which is easily affected by pH,
Alternatively, those that are easily affected by metal ions are
It is possible to prevent that influence. In particular, when using dyes that are easily affected by oxidation etc. as chemical additives,
The benefits are huge.

For example, the ultramarine microcapsules obtained in Example 2 of the microencapsulation method (A) have traditionally been unstable in acidic formulations and lose their color over time. However, the generation of hydrogen sulfide is often observed.
This is not the case with the ultramarine microcapsules according to the invention.

Regarding this point, in order to further conduct a supplementary test, we conducted a confirmation test for ultramarine that complies with the cosmetic raw material standards, and tested microencapsulated ultramarine and non-microencapsulated conventional ultramarine. When 2 tm of diluted hydrochloric acid was added to the sample, no loss of color or generation of hydrogen sulfide was observed with the former, but loss of color and generation of hydrogen sulfide were observed with the latter.

[Brief explanation of drawings]

Figure 1 shows the particle size (diameter) of Carsamine microcapsules as seen from the atomizer rotation speed of the spray drying granulator shown in Example-1 of the microencapsulation method (A).
A graph showing the distribution.

Claims (1)

[Claims] (1) A skin cosmetic, characterized in that it contains microcapsules of a colorant whose wall film material is shellac, obtained by a spray-drying granulator.