JPS6169708A - Cosmetic - Google Patents

Abstract

PURPOSE:Cosmetic having a transparent feeling of extender pigment, fluidity, smooth spread on the skin, improved adhesion, suppressing excess luster, containing one or more extender pigment whose surface is coated with an acrylic resin. CONSTITUTION:Extender pigment such a talc, kaolin, mica, sericite, etc. having 1-50mu average particle diameter is dispersed into water containing surface active agent, an acrylic resin of acrylic monomer having 10,000-200,000 average molecular weight and an initiator such as potassium persulfate, etc. are added to the dispersion, polymerization is carried out under heating with stirring, filtration and water washing are repeated, to give powdery extender pigment coated with the acrylic resin film. A composition ratio of the pigment and the acrylic resin by weight is 95:5-50:50. When CN or Cl is contained in the molecule of the acrylic resin, it is not suitable in terms of safety. The cosmetic is useful as a makeup cosmetic such as especially foundation, face powder, lipstick, eye shadow, etc.

Description

[Detailed Description of the Invention] The present invention relates to a new cosmetic, which takes advantage of the excellent properties of extender pigments such as transparency, fluidity, smooth spread on the skin, and adhesive strength, and The present invention provides cosmetics and make-up cosmetics that have a novel effect of suppressing excessive gloss.

(Prior art) Extender pigments usually blended into makeup cosmetics are often in the form of thin plates (therefore, many of them have a unique luster to some extent. The intensity of this luster varies depending on each type of pigment). Each type of extender pigment is unique depending on conditions such as the type of extender pigment, the origin of the raw stone, the manufacturing method, and the particle size distribution.

On the other hand, make-up cosmetics are required to have various gloss levels, especially gloss strength, due to their cosmetic properties. An extender pigment that has almost no luster,
By appropriately combining extender pigments with strong luster such as mica and sericite, and adjusting their blending amounts, you can improve the gloss of the entire system! Many adjustments have been made.

However, if a large amount of the above-mentioned extender pigments with strong luster is used, it will cause a shiny appearance when applied to the skin.
There was a tendency to give an unnatural shine. In order to solve this problem, the amount of glossy extender pigments had to be kept to a low level. At present, it has not been possible to fully demonstrate excellent properties such as adhesion.

(Improvements made by the inventors) Therefore, in view of the current situation, the inventors of the present invention have developed a useful powder. By coating with the above, it is possible to reduce the unnatural gloss that extender pigments have, and this eliminates the need to adjust the amount of extender pigments (as desired for each cosmetic). Attempts to coat pigments with such resins include mechanical reinforcement of pearlescent pigments (Japanese Patent Application Laid-open No. 52-93440) and surface treatment of metallic pigments for painting. (Japanese Unexamined Patent Publication No. 56-161470), etc., but coating the surface of an extender pigment with an acrylic resin and applying it to cosmetics as carried out in the present invention has not been done in the past. The present inventors coated the surface of extender pigments with various resins and examined their properties. As a result, they found that the transparency was high (that is, the visible light transmittance was low, and the mechanical strength was also low). They found that a superior resin is preferable, and discovered that acrylic resin is the most suitable such resin.In addition, the coated pigment thus obtained retains the transparency and transparency that the pigment has before being coated. They discovered that it has excellent properties such as fluidity, smooth spread on the skin, and adhesive strength, and were able to complete the present invention.

The present invention provides cosmetics based on this knowledge.

The present invention relates to a cosmetic composition containing one or more coated pigments whose surfaces are coated with one or more acrylic resins.

(Configuration of the present invention) The configuration of the present invention will be explained in detail below.

Extender pigments used in the present invention may be those applicable to ordinary cosmetics, such as talc, kaolin, mica, and sericite, and these may be used singly, in combination, or in combination.

In addition, in the present invention, these pigments have an average particle diameter of 1
Those in the range of μ to 50 μ are preferably used. If the average particle diameter exceeds 50 μm, it tends to give a strange feeling when used in cosmetics, and if it is less than 1 μm, the transparency and fluidity deteriorate, which is not preferable.

Next, as the acrylic resin which is the coating substance applied to the coated pigment of the present invention, acrylic acid, methyl acrylate,
Polymers or copolymers derived from acrylic esters such as butyl acrylate, methacrylic esters such as methacrylic acid, methyl methacrylate, and butyl methacrylate, and acrylic monomers such as polyethylene glycol dimethacrylate are used. Most acrylic resins can be used in the present invention, but if the molecule contains 77 groups or chlorine, it is not suitable for the cosmetic of the present invention for safety reasons.

In addition, the average molecular weight of the acrylic resin used in the present invention is
It is 10,000 to 200,000, preferably 20,000 to 150,000.

It is known that the percutaneous absorption of substances on the skin becomes more difficult as the molecular weight of the substance increases.
It is known that polymeric substances with a molecular weight of 10,000 or more are hardly absorbed through the skin. Since this non-transdermal absorption has an important meaning in terms of skin safety, the lower limit of the average molecular weight of the acrylic resin used in the present invention is set at 10,000. Regarding the upper limit, even if the average molecular weight exceeds 200,000, there will be no problem with respect to the purpose of the present invention, but
A degree of polymerization higher than this is unnecessary and is not preferable from an economic point of view, since it leads to an increase in costs.

Next, as a method for coating the surface of the extender pigment with the acrylic resin, known methods can be used, including the following three methods.

1. Disperse the extender pigment in water containing a surfactant, add an acrylic monomer and an initiator such as potassium persulfate or sodium hydrogen sulfite to this, perform a polymerization reaction while heating and stirring, and filter. , a method of obtaining an acrylic resin-coated extender pigment by cycling the water washing process.

2. Dissolve the acrylic resin in an organic solvent such as benzene or toluene, stir and disperse the extender pigment at 7 t, then add alcohol such as methanol or ethanol to coat the acrylic resin on the surface of the extender pigment. Precipitate, filter,
A method of obtaining an acrylic resin-coated extender pigment by washing.

3. A method in which an acrylic resin is dissolved in an organic solvent such as benzene or toluene, an extender pigment is added thereto, stirred and dispersed, and then the solvent is distilled off to obtain an acrylic resin-coated extender pigment.

It is possible to produce the coated pigment used in the present invention by the above method, etc.), and in the coated pigment obtained, the composition ratio of the pigment and the acrylic resin that is the coating material is determined depending on the desired gloss. Although arbitrarily selected, the weight ratio is approximately 95:
5-50:50 preferably 80:20-60
: The range is 40. The coating material is above the pigment
If the ratio is less than the above ratio, the desired gloss adjustment effect will be insufficient, and if the amount of the coating material is more than the above ratio, it will be difficult to achieve a uniform coating, resulting in problems such as the formation of secondary particles and caking. easy (, not suitable for the present invention).

The coated pigment used in the present invention can be widely used in cosmetics that use pigments, and the cosmetics obtained by the present invention include makeup cosmetics such as foundation, powder powder, solid powder, pink blush, and eye shadow. The present invention provides cosmetics with excellent uniformity and gloss, a highly safe feeling of use, and excellent physical properties.The method of compounding is the same as that of conventional pigments. The amount can be arbitrarily selected depending on the properties of the cosmetic, but it is 5% to 90% of the total weight of the cosmetic ingredients.This is due to the inherent transparency of the pigment, This is because a minimum content of 5% or more is required to take advantage of its excellent properties such as fluidity, smooth spread on the skin, and adhesive strength, and to adjust the gloss of the applied cosmetic. Although there is no particular restriction on the upper limit, about 90% is preferable considering the addition of colorants, oils, fragrances, etc.

Next, an example of manufacturing the coated pigment used in the present invention will be shown.

Production Example-1 Production of IJ MMA-coated mica Sodium di-2-ethylhexyl-sulfosuccinate 75% (W)
Aqueous solution 2.42 and white mica piece 80? Purified water 900ml
ml I/C is added, dispersed with a disper, transferred to a round bottom separable flask, and deoxidized by bubbling N2 gas while stirring at a temperature of 40°C. Next 9 methyl methacrylate (hereinafter abbreviated as MMA) 48? After adding 0.5 f of potassium persulfate and 0.59 f of sodium hydrogen sulfite, stirring was continued for 2 hr. After the polymerization reaction was carried out, it was cooled, filtered and washed with water 6 times (repeatedly, the resulting powder was The object was dried at 80° C. for 12 hours to obtain polyMMA-coated mica 120? - (coating:) ratio; mica:
Poly MA = 8:5) Production example - 2 Bo! / Manufacture of MMA broken talc Example 1 - 1 mica is talc (
Coating ratio; talc: poly MMA = 8:5) Production example - 3-poly IJ Production of MMA-coated sericite Production example - 1 in which the mica is sericite (coating ratio; sericite: poly M
MA=8:5) Production example-4 (MMA:BMA”
= 7:3) Production of copolymer-coated mica HMA'' Nibutyl methacrylate Sodium lauryl sulfate 1.89 and white mica flakes 809 were added to 90C1tf of purified water, dispersed with a disper, and placed in a round bottom separable flask. Transfer and deoxidize by bubbling N2 gas while stirring at a temperature of 40°C. Next, add KMMA35F and BMA 15F, and further add 0.5% of potassium persulfate and 0.5% of sodium bisulfite.
After adding 59 and stirring for 2 hours, the polymerization reaction continued.
After cooling, filtering and washing with water were repeated three times, and the resulting powder was
Dry for 12 hours at 0°C and coat with (MMA:BMA=7:3) near polymer-coated mica 121? I got it.

(Covering ratio; mica: MMA-BMA copolymer = 8:
5) Next, examples of the cosmetics of the present invention will be shown.

Example-1 Cream 7 Andation A and B were each heated to 80°C, B was gradually added to AK, mixed and emulsified in an emulsifying pot, then cooled to 30°C while stirring, and poured into a container. Fill it and make it into a product.

Real) f! +Example-2 Cake-like foundation B Mix 8.5A of liquid paraffin in a Henschel type mixer, grind it in a NoS immer mill, then add B, mix in a Henschel type mixer, grind it in a hammer and mill, The product is pressed into a mold.

Practical Example-5 Finishing Sauder B Liquid Bakfin 3.0A was mixed in a Henschel type mixer, ground in a hammer mill,
After adding B and mixing with a Henschel type mixer, the mixture is treated with a blower sifter 7 and filled into a container to form a product.

(Effects) Next, in order to examine the gloss of the coated pigment used in the present invention, the light reflectance was measured for the extender pigment before coating and the processed powder after coating, and the results are shown in Table 1.

The higher the reflectance, the higher the gloss. The test method is as follows.

Gloss test: Coat skin was uniformly coated with MAIKU R Kokurinutarinowasokusu, and the sample powder was spread evenly on this using a horsehair brush.The light reflectance was measured using the specimen as a specimen. . The measurement was performed by measuring reflected light at 75° using GRO8S MgTER manufactured by Nippon Denshoku Industries.

Table 1 As shown above, the coated pigment used in the present invention has a lower light reflectance than the inner core material pigment, has a suppressed gloss, and has a good appearance when applied to the skin. It is possible to provide a cosmetic that does not give a shiny or unnatural luster.

Next, in order to examine the transparency of the coated pigment used in the present invention, the whiteness of the body IR pigment before coating and the processed powder after coating was measured and shown in Table 2. It can be said that the lower the whiteness, the greater the transparency. The test method is as follows.

Transparency test: Samples were processed in the same manner as used in the gloss test and used as specimens.

The whiteness of this product K was measured using a high-speed colorimeter manufactured by Murakami Shikiken in accordance with JIS L 1074 "Whiteness".

Table 2 As described above, the coated pigment used in the present invention exhibits a whiteness value similar to that of the uncoated pigment, which is the inner core substance, and
It has similar transparency and is a useful powder for cosmetics.

Next, in order to examine the fluidity of the coated pigment used in the present invention, the angle of repose of the extender pigment before coating and the processed powder after coating was measured and shown in Table 5. The smaller the angle of repose, the greater the fluidity.

The test method is as follows.

Fluidity test: The angle of repose of the sample was measured using a micron powder tester.

Table 3 As shown above, the coated pigment used in the present invention exhibits a numerical value of the angle of repose that is similar to that of the uncoated pigment that is the inner core material, that is,
It has similar fluidity and is convenient to handle during cosmetic manufacturing, and also spreads smoothly on the skin.

Next, the cosmetics applied to the present invention (Examples 1 to 3) were subjected to sensory evaluation, and the results are shown in Table 4. As a comparison product, each cosmetic was prepared by blending a non-coated pigment (inner core material of processed powder) in place of the N pigment used in the present invention (nui) and subjected to sensory evaluation. The test method is as follows.

Sensory test: A panel of 10 mixed men and women evaluated the following three sensory evaluation items: luster of the makeup-applied skin, smoothness of spread on the skin, and transparency of the makeup-applied skin. The average value of the 10 people was used as the evaluation score.

As shown in Table 4 above, even when the cosmetics applied to the present invention are actually applied to the skin, they do not give the makeup-covered skin too much luster and do not give a shiny or unnatural appearance. It did not give any shine, and its sensory properties such as smooth spread on the skin and transparency of the skin after makeup were similar to conventional control products.

As described above, the coated pigment used in the present invention has the excellent properties of conventional pigments, and at the same time has a novel gloss control ability, and has excellent properties not found in conventional cosmetic pigments. It can be seen that it is a powder.

Claims (1)

[Scope of Claims] 1) A cosmetic comprising one or more coated pigments in which the surface of an extender pigment is coated with one or more acrylic resins. 2) Claim 1, wherein the extender pigment is selected from the group consisting of talc, kaolin, mica, and sericite.
Cosmetics listed in section.