JP2002363444A - Pigment for cosmetic and cosmetic containing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a pigment for a cosmetic, capable of providing very high oil absorption and soft feeling when being formulated with a makeup cosmetic, e.g. a foundation, an eye shadow and a rouge, and having characteristics of the reflection of light being soft, and further to provide the cosmetic containing the pigment for the cosmetic. SOLUTION: The cosmetic containing the surface-covered pigment for the cosmetic is prepared by formulating the surface-covered pigment for the cosmetic obtained by surface-covering a pigment powder for the cosmetic with 0.1-30 wt.% linear alkyl acrylate copolymer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention has a very high oil-absorbing property, a soft touch, and a soft light reflection when incorporated into makeup cosmetics such as foundations, eye shadows, and blushers. And a cosmetic containing the cosmetic pigment.

[0002]

2. Description of the Related Art Cosmetic pigments conventionally used in makeup cosmetics, such as foundations, eyeshadow, and blushers, are used in makeup cosmetics in order to have a high oil absorption and a soft touch. The combination of pigments can be devised or special shapes (plate, spherical)
For example, a method of blending a powder having the following is employed.

[0003] Further, in order to enhance oil absorbency, a technique of surface coating a cosmetic pigment with lauroyl lysine is generally known.

[0004]

However, the method of blending the above-mentioned pigment powder having a special shape or using the pigment powder surface-coated with lauroyl lysine has a relatively high oil absorbing property. Although a better feeling of use can be obtained, it is very difficult to give a soft touch.

Further, when a plate-like powder such as sericite, mica, or boron nitride is blended in order to improve the slip feeling, strong light reflection occurs and it is difficult to obtain a soft shine.

The present invention has been made in order to solve such problems, and has a high oil absorbing property and a soft touch when incorporated in makeup cosmetics such as foundation, eyeshadow, and blusher. It is another object of the present invention to provide a cosmetic pigment powder exhibiting soft light reflection and a cosmetic containing the same.

[0007]

Means for Solving the Problems and Actions / Effects In order to achieve the above object, a cosmetic pigment according to the first invention comprises:
The present invention is characterized in that a surface of a pigment powder for cosmetics is coated with a linear alkyl acrylate copolymer.

According to the present invention, since the surface of the pigment powder for cosmetics is coated with the linear alkyl acrylate copolymer, the cosmetics have high oil absorption, a soft touch and a soft light reflection. For example, when formulated as a makeup cosmetic such as foundation, eyeshadow, blush, etc., it is highly oil-absorbing, has a soft touch, and exhibits soft light reflection for cosmetics Pigments can be obtained.

In the present invention, the surface coating amount of the linear alkyl acrylate copolymer is preferably 0.1 to 30% by weight based on the cosmetic pigment (second invention). The surface coating amount is 0.1w with respect to the cosmetic pigment.
If it is less than t%, high oil absorbency and soft feel and soft light reflection cannot be obtained when it is blended as a cosmetic, and if it exceeds 30 wt%, the linear acrylic acrylate copolymer itself precipitates. As a result, it becomes difficult to form a shape as a cosmetic.

The linear alkyl acrylate copolymer preferably has a surface coating amount of 0.5 to 20 wt.
It is better to be%. Then, when formulated as a cosmetic, the desired oil absorption and soft feel,
A pigment powder for cosmetics that gives a soft light reflection can be obtained.

Next, the cosmetic according to the third invention is characterized in that
The present invention relates to a cosmetic comprising the cosmetic pigment of the invention or the second invention. ADVANTAGE OF THE INVENTION According to the cosmetics of this invention, the oil absorption property is high, it shows soft feeling, and the cosmetics of the finish of soft reflection of light can be obtained.

[0012]

Next, embodiments of the cosmetic pigment according to the present invention and a cosmetic containing the same will be described.

[0013] In the cosmetic pigment according to the present invention, the linear alkyl acrylate copolymer coated on the surface includes methyl methacrylate, ethyl acrylate, n-butyl acrylate, octyl acrylate, dodecyl acrylate, octadecyl acrylate, and 2-ethylhexyl. An alkyl acrylate copolymer obtained by polymerizing acrylate or the like as a monomer.

As a method of coating the surface of such a linear alkyl acrylate copolymer on a pigment powder,
There are the following three methods.

The first method is to polymerize an alkyl acrylate copolymer in the presence of a pigment powder. As the polymerization step method, bulk polymerization, suspension polymerization, emulsion polymerization, solution polymerization, and the like are good, and there is no particular limitation. This is preferred because the purification of the product is simple. On the other hand, the form of polymerization is addition polymerization, such as radical polymerization, ionic polymerization, or plasma polymerization, but is not particularly limited. In the case of the radical polymerization method, azobisisobutyronitrile, benzoyl peroxide,
Lauroyl peroxide, cumene peroxide and the like,
Examples of the initiator in ionic polymerization include sodium, potassium, lithium, Grignard reagent, lithium alkoxide and the like.

As a second method, a linear alkyl acrylate copolymer is preliminarily polymerized, and the copolymer is dissolved in an appropriate solvent or formed into an aqueous dispersion emulsion to prepare a solution or a linear alkyl acrylate solution. A method of dispersing a pigment powder in an aqueous dispersion emulsion and evaporating and removing a solvent or moisture while stirring is mentioned.
The method of polymerizing the linear alkyl acrylate copolymer itself is performed in the same step as in the first method described above, or by a polymerization method.

As a third method, pigment powder is dispersed in a solution of a linear alkyl acrylate copolymer or an aqueous dispersion emulsion in the same manner as in the second method, and this slurry solution or emulsion is spray-dried. Is a method in which a solvent or moisture is removed by evaporation at a stretch. According to the third method, the surface of the linear alkyl acrylate copolymer can be coated at a high coverage. In the second method, when an attempt is made to coat the linear alkyl acrylate copolymer with a high surface coverage, the linear alkyl acrylate copolymer acts like a binder, and the completed surface-coated pigment powder is obtained. It is suitable only for surface treatment with a low coverage of 5 wt% or less, because the product has a large body particle size and a poor feeling.

The amount of the linear alkyl acrylate copolymer to be coated on the pigment powder should be optimized according to the particle size of the pigment powder. 0.1 to body
It is preferably 30 wt%, more preferably 0.5 to 20 wt%, which is suitable for obtaining the desired high oil absorbency, soft feel, or soft light reflection.

When the surface coating amount is less than 0.1 wt%,
The high oil absorbency and the soft feel, which are the characteristics of the present invention,
The characteristic of soft light reflection cannot be obtained. If it exceeds 30 wt%, not only the linear alkyl acrylate copolymer is coated on the surface, but also the copolymer itself precipitates out and is blended in cosmetics. In such a case, it is very difficult to form a shape as a cosmetic by a usual method.

The cosmetic pigments to be surface-coated according to the present invention include inorganic pigments, organic pigments and resin powder pigments.

Here, as the inorganic pigment, titanium oxide,
Bengala, yellow iron oxide, black iron oxide, ultramarine, zinc white, magnesium oxide, zirconium oxide, mica, sericite, talc, silica, kaolin, calcium carbonate, chromium hydroxide, magnesium silicate, aluminum oxide, barium sulfate, titanium And coated mica.

Examples of the organic pigments include lithol rubin B, lake red C, lithol red, rhodamine B,
Herringdon pink CN, permanent red, benzidine orange G, phthalocyanine blue, and the like.

The resin powder pigment includes nylon powder, acrylic powder, silicon powder and the like.

According to the pigment for cosmetics of the present invention, it is possible to impart to cosmetics the characteristics of high oil absorption, a soft touch, and a soft reflection of light.

The amount of the cosmetic pigment to be added to the cosmetic is 0.1 to 0.1% based on the total amount of the cosmetic.
100 wt% is preferable, and 1 to 80 wt% is more preferable.
%. Further, as the dosage form of the cosmetic, two-layered,
Conventionally known dosage forms such as a water-in-oil emulsion, an oil-in-water emulsion, a gel, a spray, a mousse, an oil, and a solid can be used. For applications of the foundation, solid, solid emulsion, gel, water-in-oil emulsion, oil-in-water emulsion, oil, mousse, and the like are preferable.

[0026]

EXAMPLES Next, specific examples of the cosmetic pigment and the cosmetic containing the same according to the present invention will be described.

(Production Example 1) Under a nitrogen stream, 2,000 ml of an aqueous solution of about 1% polyethylene glycol was put into a separable flask equipped with a stirrer, and 200 g of pigment powder was prepared.
Was added and stirred and dispersed. Continue heating, 55-60
℃, the amount of monomer charged to sericite is 1
A monomer solution in which 0.09 g of azobisisobutyronitrile was previously dissolved in 16.00 g of ethyl acrylate and 4.00 g of methyl methacrylate was dropped and polymerized so as to be 0 wt%. The resulting composition is purified,
Drying and pulverization gave a good powder. As the pigment powder, seven kinds of titanium oxide, sericite, mica, talc, yellow iron oxide, red iron oxide, and black iron oxide were used to obtain seven kinds of surface-coated pigment powder.

(Production Example 2) According to Production Example 1, 32.00 g of ethyl acrylate and 8.00 g of methyl methacrylate were added to 0.1% of azobisisobutyronitrile in an amount of 20 wt% monomer based on sericite. 18
g was used to produce a good powder. At this time, seven kinds of surface-coated pigment powders were obtained in the same manner as in Production Example 1.

(Production Example 3) A linear alkyl acrylate copolymer of ethyl acrylate and methyl methacrylate was obtained in the same manner as in Production Example 1 except that sericite was charged. The obtained linear alkyl acrylate copolymer was weighed so as to be 30% by weight based on the pigment powder, and dissolved in methylene chloride so as to be 10% by weight to obtain a solution. This solution was charged into a Henschel mixer, and a predetermined amount of pigment powder was further charged while stirring, followed by stirring for 30 minutes. Thereafter, the mixture was gradually heated to evaporate and remove the methylene chloride as a solvent, and finally the pressure was reduced to completely remove the methylene chloride. Then, the mixture was discharged from a Henschel mixer and pulverized by a pulverizer to obtain a fine powder. I got
Seven kinds of pigment powders were used as in Production Examples 1 and 2.

(Production Example 4) The solid content of Daitosol 5000AD (50 wt% aqueous emulsion of a copolymer having a molar ratio of ethyl acrylate to methyl methacrylate of 8: 2) commercially available from Daito Kasei Kogyo Co., Ltd. was a pigment. Daitosol 5000 so that it may be 10 wt% with respect to the powder.
The AD is weighed, water of 10 times the weight of the pigment powder is added to Daitosol 5000AD, and the mixture is stirred. The pigment powder is put into the water emulsion while stirring, and the mixture is stirred for about 30 minutes. This water-dispersed emulsion slurry was sprayed with a spray drier and dried at a stretch to completely remove water to obtain a good surface-coated pigment powder. Also in this case, seven types of powders were used in the same manner as in Production Examples 1 to 3, and seven types of surface-coated pigment powders were obtained.

As a production comparative example, a raw material powder as a raw material and a pigment powder treated with 5% lauroyl lysine were listed, and their characteristics are summarized in Table 1.

[Table 1]

(Examples 1 and 2) Using the pigments (surface-coated pigment powder) prepared in Production Examples 1 and 2, powder foundations were prepared in the following proportions. Surface Coated Sericite 35.0 Surface Coated Talc 25.0 Surface Coated Mica 20.0 Surface Coated Titanium Oxide 10.0 Surface Coated Yellow Oxide 4.0 Surface Coated Bengala 1.2 Surface Coated Black Iron Oxide 0.8 Nylon Powder 4.0 100.0

The cosmetics of Examples 1 and 2 were obtained by mixing the above powder foundation as a powder base at 88% and as a binder base at 12% with a Henschel mixer. At this time, the composition of the binder base is as follows. Dimethylpolysiloxane (6CS) 30.0 Dimethylpolysiloxane (10000CS) 25.0 Purified lanolin 9.0 Ester oil 36.0 100.0

(Examples 3 and 4) The pigments (surface-coated pigment powders) prepared in Production Examples 1 and 2 were used, and the W / O liquid foundation was adjusted according to the following formulation to obtain Examples 3 and 4. 4 was obtained. 6. Surface Coated Talc 3.0 Surface Coated Sericite 2.0 Surface Coated Titanium Oxide 15.0 Surface Coated Bengala 0.2 Surface Coated Yellow Iron Oxide 2.5 Surface Coated Black Iron Oxide 0.8 Methyl Polysiloxane (6CS) 4 Dimethylcyclohexane-methyl (polyoxyethylene) dimethylsiloxane copolymer 1.8 Methylpolysiloxane (100CS) 8.0 Methylpolysiloxane (10000CS) 4.0 Methylphenylpolysiloxane 10.0 Ethanol 10.0 1,3 -Butylene glycol 2.0 purified water 33.3 100.0

(Comparative Examples 1 and 2) Powder foundations were prepared in the same formulation as in Examples 1 and 2, using pigments each having a surface coating of 5 wt% with lauroyl lysine as the surface coating pigment.

(Comparative Examples 3 and 4) W / O liquid foundations were prepared in the same composition as in Examples 3 and 4, using pigments each having a surface coating of 5 wt% with lauroyl lysine as the surface coating pigment.

With respect to each of the cosmetics of Examples 1 to 4 and Comparative Examples 1 to 4, softness of use feeling, softness of light reflection, and oil absorption effect were organoleptically evaluated by 10 panelists. The results are shown in Table 2.

[Table 2]

From the results shown in Table 1 above, the surface-coated pigments prepared in Production Examples 1 to 4 of the present invention were:
It can be seen that the oil absorption is higher than that of the pigment powder as the raw material or the 5 wt% lauroyl lysine surface-coated pigment. In addition, the results shown in Table 2 show that the cosmetics of the present invention are all excellent in softness of use, softness of light reflection, and oil absorption effect.

As described above, according to the cosmetic pigment of the present production example and the cosmetic of this example in which the cosmetic pigment is blended, the absorption amount is high, the soft feeling is obtained, and
The present invention can provide a cosmetic pigment and a cosmetic that impart soft characteristics to light reflection characteristics.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) A61K 7/035 A61K 7/035 F term (Reference) 4C083 AB232 AB242 AB432 AC102 AC122 AD072 AD152 AD162 BB25 CC11 CC12 CC14 DD17 DD32 4J037 AA09 AA10 AA11 AA15 AA17 AA18 AA19 AA21 AA25 AA26 AA27 AA30 CC16 DD05 EE03 FF02 FF21

Claims (3)

[Claims] 1. A pigment for cosmetics comprising a pigment powder for cosmetics, the surface of which is coated with a linear alkyl acrylate copolymer. 2. The amount of the linear alkyl acrylate copolymer coated on the surface of the pigment powder for cosmetics is set at 0.1.
The cosmetic pigment according to claim 1, wherein the content is 1 to 30 wt%. 3. A cosmetic comprising the cosmetic pigment according to claim 1 or 2.