JPH05194141A - Cosmetic - Google Patents

Abstract

PURPOSE:To obtain a cosmetic improved in slip characteristics, dryness feeling, moisture retention, etc., and having extremely excellent performance by applying biodegradable polyester particles having particle diameter in a specific range to cosmetic particles. CONSTITUTION:A cosmetic containing a biodegradable polyester having 3-50mum average particle diameter, preferably 5-35mum particles [a polyester produced by a microorganism, e.g. poly(3-hydroxybutylate)]. The cosmetic is free from floating of powder, dryness feeling and loose feeling and excellent in total finishing. Since the polyester particles produced by the microorganism exhibits excellent biocompatibility, these particles causes no problems such as skin irritation even when large amounts of these particles are contained therein.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a particle-containing cosmetic composition. More specifically, the present invention relates to a particle-containing cosmetic composition containing biodegradable polyester particles, which has improved spreadability, bulkiness, moisturizing properties and the like.

[0002]

2. Description of the Related Art Conventionally, cosmetic particles such as various inorganic and organic pigments have been added and blended in cosmetics. Particularly in makeup cosmetics, the cosmetic particles play a large role, and many kinds of cosmetic particles are used in accordance with the purpose of makeup and to obtain functionality. Furthermore, in order to obtain product characteristics, it has been studied to utilize the characteristics of individual powders and combine the formulations.

Conventionally, spherical synthetic resin particles such as spherical nylon, spherical polyethylene and spherical polystyrene have been used in order to improve the spreadability. Recently, spherical cellulose particles have also been used to improve the stickiness, and various improvements have been proposed to eliminate the drawbacks of these particles. For example, a method of treating with N-acyl amino acid amide (JP-A-1-172312) and a method of treating spherical cellulose particles with a moisturizing polymer (JP-A-1-3112).
3413) and the like.

[0004]

However, the above-mentioned N
-The method of treating with an acylamino acid amide improves the makeup durability, but the moisturizing property is not sufficient, and the method of treating with a moisturizing polymer requires the use of a special moisturizing polymer. It was

[0005]

Means for Solving the Problems As a result of intensive investigations by the present inventors regarding cosmetic particles for improving spreadability, bulkiness, moisturizing properties, etc., of cosmetics, biodegradation having a particle size within a specific range was conducted. The present invention has been accomplished by discovering that a cosmetic material having extremely excellent performance without the above-mentioned problems can be obtained by applying the hydrophilic polyester particles to cosmetic particles.

That is, the gist of the present invention is that the average particle size is 3 to
A cosmetic composition is characterized by containing biodegradable polyester particles of 50 μm. The biodegradable polyester in the present invention is a polyester produced by a microorganism, for example, poly (3-hydroxybutyrate), poly (3-hydroxybutyrate) -poly (4-hydroxybutyrate) copolymer, poly (3 -Hydroxybutyrate) -poly (3-hydroxyvalerate) copolymer and the like.

Since these polyesters produced by microorganisms are thermoplastic polymers that accumulate in the cells of many microorganisms as energy storage substances and exhibit excellent biodegradability and biocompatibility, they are used as clean plastics that preserve the environment. It is attracting attention and is expected to be applied to various fields such as medical materials and sustained release systems. Examples of the microorganisms having the above-mentioned polyester-producing ability include, for example, Alcaligenes faecalis,
Alkaline Gene
s ruhlandii), Alcaligenes eutrophus and the like.

As a representative example of strains belonging to these bacterial species, Alcaligenes rulandi ATCC 1574
9, Alcaligenes Yutrofus H-16ATCC1
7699 and the mutant strain of this H-16 strain, Alcaligenes eutrophus NCIB11597, NC
IB11598, NCIB11599, NCIB1
1600 etc. can be mentioned. The mycological properties of these microorganisms belonging to the genus Alcaligenes are BERGEY '
MANUAL OF DETERMINATIVE B
ACTERIOLOGY, and the mycological properties of Alcaligenes yutrofus H-16 are described in, for example, J. GE
N. MICROBIOL. , 115, 185-192
(1979).

Further, poly (3-hydroxybutyrate)-
Poly (4-hydroxybutyrate) copolymer (hereinafter P
(Abbreviated as 3HB-co-4HB) can be produced as a copolymer having an arbitrary composition ratio, for example, by the method described in JP-A-64-48821. The method for producing polyester particles is not particularly limited, for example, by dissolving in a polyester-soluble solvent to form a solution,
Next, the solution is dropped into a poor solvent that is being stirred, and polyester particles are deposited while evaporating the solvent, and then,
Obtained by ordinary filtration, washing with water and drying. The particle size of the polyester particles can be controlled by the concentration of polyester dissolved in the solution, selection of the poor solvent, stirring speed of the poor solvent, and the like. Regarding these, J. Controlled R
Release 4 1986 25-32 and Chem.
Pharm. Bull. 29 113363-3368
Etc.

The solvent is not particularly limited as long as it can dissolve the polyester, but organic halogen solvents such as chloroform and methylene chloride and methyl acetate are preferable. Although water or the like can be used as the poor solvent, an aqueous solution of 0.1 to 5% by weight of polyvinyl alcohol, gelatin, sodium alginate or the like is preferable because a narrow particle size distribution can be obtained. When the particle size distribution is wide, it is effective to limit the particle size to a specific particle size range by a known method.

The cosmetic of the present invention is not particularly limited as long as it has powder as a constituent component, and for example, white powder, foundation, lipstick, blusher, eyeliner, mascara, eye shadow, base cream, emulsion, lotion. , Cream, etc. The cosmetic of the present invention has a moisturizing property because it contains the polyester particles produced by a microorganism, but other moisturizing agents may be coated or impregnated into the particles depending on the application. Examples of other moisturizers include polyhydric alcohols such as propylene glycol and glycerin, and natural polymers such as hyaluronic acid.

The microorganism-produced polyester particles used in the present invention are spherical particles having an average particle size of 3 to 50 μm, preferably 5 to 35 μm. When the amount is less than the lower limit, the effect of spreading is small, and when the amount is more than the upper limit, a rough feeling tends to occur, which is not preferable. Also, within the range that does not lose its effect,
Depending on various purposes, various additives such as known surface treatment of the particles or combined use of other pigments can be used.

The content of polyester particles in the cosmetic composition of the present invention should be changed according to the cosmetic composition, but 0.1-60 in the case of the powder cosmetic composition having the highest content.
It is in the range of% by weight. Due to its excellent biocompatibility, the polyester particles of the present invention do not have the problem of rough skin like other synthetic resin particles even when contained in a large amount.

[0014]

EXAMPLES The present invention will now be described in detail with reference to examples, but the present invention is not limited to these examples without departing from the gist thereof. Reference Example [Production of P (3HB-co-4HB) Particles] 1 g of P (3HB-co-4HB) was added to 150 g of methylene chloride.
It was dissolved in ml. Next, the solution is stirred at a stirring rate of 1200 r
It was added dropwise to a 0.5 wt% polyvinyl alcohol aqueous solution with stirring at pm. By dropping, P (3HB-co-4H
B) emulsified. The methylene chloride was evaporated by continuing stirring at room temperature.

After evaporating methylene chloride completely, filtration, washing with water and drying under reduced pressure were carried out to obtain an average particle size of 29 μm.
P (3HB-co-4HB) particles were prepared. The average particle size was measured using an optical microscope (BH-2; manufactured by Olympus Optical Co., Ltd.). Example 1 [Powder foundation] The following (1) to (5) were mixed with a Henschel mixer, and the mixture of (6) to (11) heated and dissolved was added thereto, and mixed and pulverized. This was molded into a medium plate to obtain a powder foundation. (Numbers are% by weight, the same below) (1) Sericite; 47.28 (% by weight) (2) Talc; 15.0 (3) P (3HB-co-4HB) particles prepared in Reference Example; 0 (4) titanium dioxide; 6.5 (5) iron oxide; 3.5 (6) trimethylolpropane triisostearate;
5.0 (7) Squalane; 6.0 (8) Sorbitan sesquioleate; 1.0 (9) Preservative; 0.5 (10) Antioxidant; 0.02 (11) Perfume; 0.2

Comparative Example 1 [Powder Foundation] A powder foundation having the following composition was obtained in the same manner as in Example 1. (1) Sericite; 47.28 (wt%) (2) Talc; 15.0 (3) Spherical nylon 12; 15.0 (4) Titanium dioxide; 6.5 (5) Iron oxide; 3.5 ( 6) trimethylolpropane triisostearate;
5.0 (7) Squalane; 6.0 (8) Sorbitan sesquioleate; 1.0 (9) Preservative; 0.5 (10) Antioxidant; 0.02 (11) Perfume; 0.2 Evaluation The powder foundations of Example 1 and Comparative Example 1 were compared in an actual use test with 20 test subjects. The results are shown below.

[0017]

[Table 1]

[0018]

EFFECTS OF THE INVENTION The cosmetic composition of the present invention has good spreadability, stickiness, etc., no powder floating after being applied to the skin, no feeling of bulkiness or roughness, and good overall finish. In addition, since the microorganism-produced polyester particles of the present invention have excellent biocompatibility, there is no problem such as rough skin even when contained in a large amount.

Continuation of front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display area C08L 67/04 KJT 8933-4J

Claims (2)

[Claims] 1. A cosmetic material comprising biodegradable polyester particles having an average particle diameter of 3 to 50 μm. 2. The biodegradable polyester particles are poly (3-
2. The cosmetic according to claim 1, wherein the cosmetic is particles of hydroxybutyrate).