JP2011063560A - Solid powder cosmetic product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solid powder cosmetic product produced by a wet-forming method and free from troubles of surface crack and void while keeping high ultraviolet ray protection effect. <P>SOLUTION: The solid powder cosmetic product containing a flaky powder coated with a metal oxide, free from luster and having an aspect ratio of ≥10 is produced by adding a volatile solvent to a cosmetic base to form a slurry, filling the slurry in a container and removing the volatile solvent. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention belongs to the technical field related to cosmetics. More specifically, by blending a plate-like powder having an aspect ratio of 10 or more that does not have a glittering property that is coated with a metal oxide, a crack or a gap is generated between the surface and a container during wet molding. The present invention relates to a solid powder cosmetic having no surface.

  The solid powder cosmetic molding method is a dry molding method in which a powder composition containing a powder and an oil agent is compression-molded, and a slurry is prepared by mixing a powder composition containing a powder and an oil agent with a volatile solvent. In general, a wet molding method or the like in which the container is filled and the volatile solvent is removed by drying is used. The wet molding method is an excellent molding method capable of obtaining a good molded product even when it contains a large amount of powder having elasticity or flaky powder having a high aspect ratio, compared to the dry molding method. It is.

  However, the solid powder cosmetic by the wet molding method has problems such as a crack on the surface due to the shrinkage of the contents when the volatile solvent is removed, and a gap between the contents and the container. As a solution to this problem, a method of combining a high aspect ratio powder and a spherical powder (Patent Document 1) and a method of combining a fluorine compound-treated powder and an organically modified clay mineral (Patent Document 2) are known. It was done.

Japanese Patent No. 3675564 Japanese Patent No. 3752187

  On the other hand, one of the important functions of cosmetics is to protect the skin from ultraviolet rays. For this reason, organic UV absorbers such as inorganic UV protection agents such as fine particle titanium oxide and fine particle zinc oxide and cinnamic acid have been widely used in the past to give cosmetics UV protection effects. (Non-patent documents 1 to 3).

FRAGRANANCE JOURNAL, 27 (5), PAGE25-30 (1999) J. et al. SOC. COSMET. CHEM. JAPAN, VOL. 31, NO. 4, PAGE 373-384 (1997) FRAGRANCE JOURNAL, 28 (5), PAGE 26-32 (2000)

  In order to impart a high UV protection effect to solid powder cosmetics, it is common practice to use fine metal oxides, which are inorganic UV protection agents. When a large amount is added, cracks and gaps are likely to occur, and even when the methods shown in Patent Document 1 and Patent Document 2 described above are used, the amount of metal oxide is limited to a small amount and can provide a high UV protection effect. was difficult.

  For this reason, in the solid powder cosmetics by the wet molding method, it has been desired to develop a solid powder cosmetic that does not cause cracks or gaps on the surface while having a high UV protection effect.

  In view of such circumstances, the present inventors have conducted intensive research, and as a result, by using a plate-like powder having an aspect ratio of 10 or more that does not have a glitter property and is coated with a metal oxide, As a result, the inventors have found that a solid powder cosmetic that does not cause cracks or gaps on the surface while having a high UV protection effect can be obtained, and the present invention has been completed.

  That is, the present invention is a solid powder cosmetic containing a plate-like powder having an aspect ratio of 10 or more that does not have a glittering property coated with a metal oxide, and a volatile solvent is added to the cosmetic base. Thus, a solid powder cosmetic is provided, which is produced by filling the slurry into a container and then removing the solvent.

Hereinafter, the present invention will be described in detail.
The plate-shaped powder having an aspect ratio of 10 or more that is not coated with the metal oxide used in the present invention is agglomerated during wet molding because the metal oxide is fixed on the surface of the plate-shaped powder. It is possible to suppress the occurrence of surface cracks and gaps.

  Examples of the metal oxide used in the present invention include titanium oxide, zinc oxide, cerium oxide, iron oxide, and the like. One or more of these can be used, and titanium oxide is preferably used.

  Examples of the plate-like powder having an aspect ratio of 10 or more, which does not have glitter, used in the present invention include powders such as mica, sericite, smectite, talc, synthetic mica, synthetic phlogopite, and anhydrous silicic acid. One or more of these can be used, but sericite is preferably used for a better feeling of use. The average particle size of these plate-like powders is not particularly limited, but is preferably 0.5 to 200 μm. The aspect ratio is a value obtained by dividing the average particle diameter by the average thickness of the particles. The average particle diameter is a median diameter value measured by dispersing powder in ethanol using a laser diffraction particle diameter measuring apparatus (LA-920, Horiba, Ltd.). The average thickness of the particles is a value obtained by measuring using an electron microscope and dividing the total value by the number of measurements.

The presence or absence of glitter is measured by the following colorimetry method. First, a 40 mm width double-faced tape made by Nichiban Co., Ltd. is applied to the black portion of OPERITY CHARTS made by LENETA, and each composite powder is uniformly applied with a cosmetic puff. The coated sample was fixed at an incident angle of 45 degrees with a digital variable angle gloss meter manufactured by Suga Test Instruments Co., Ltd., and the gloss intensity (I20) at a light receiving angle of 20 degrees and the gloss intensity at 45 degrees (I45) were measured. I20 is calculated, and based on this ratio, I45 / I20 = 2.0 or more: with glittering I45 / I20 = less than 2.0: without glittering.

  The amount of the metal oxide coated on the plate-like powder is not particularly limited, but is preferably 10 to 80% by weight and more preferably 20 to 70% by weight with respect to the total amount of the composite powder. Moreover, the average particle diameter of the coated metal oxide is not particularly limited, but is preferably 10 to 50 nm.

The method of coating the plate-like powder with the metal oxide is not particularly limited. For example, the plate-like powder is dispersed in a solvent, and titanium oxide is precipitated in the dispersion using titanyl sulfate or the like ( Precipitation method: Patent Documents 3 to 5), a method in which a metal oxide and a plate-like powder are mixed and adsorbed using a bead mill or the like (adsorption method), and the like.
Japanese Patent Publication No. 5-87545 Japanese Patent No. 2549691 Japanese Patent No. 2559037

  The metal oxide-coated plate-like powder may be blended as it is, but those obtained by subjecting the surface of the composite powder to a hydrophobic treatment such as a silicone treatment or a fatty acid treatment can also be used. As such powder, commercially available cover leaf PC-2035 (manufactured by Catalyst Kasei Kogyo Co., Ltd., titanium oxide-coated sericite, about 70% by weight of sericite and 30% by weight of titanium oxide based on the total amount of composite powder), Sanshin Mica STA-20C (manufactured by Sanshin Mining Co., Ltd., titanium oxide-coated sericite, approximately 80% by weight of sericite and 20% by weight of titanium oxide based on the total amount of composite powder), SMT-57S (manufactured by Teika Co., Ltd., silicone treatment) And titanium oxide-coated sericite, 62.2% by weight of sericite and 29.1% by weight of titanium oxide).

  In the present invention, the amount of the plate-like powder coated with the metal oxide is preferably 60% by weight or less based on the total amount of the cosmetic. When it exceeds 60% by weight, the feeling of use tends to be slightly inferior.

In the solid powder cosmetic of the present invention, in addition to the metal oxide-coated plate-like powder, powders and oils other than these can be blended within a range not impairing the effects of the present invention.
Other powders used in the present invention include inorganic powders such as talc and sericite, organic powders such as resin powder, polyamide powder, polyethylene powder, and silicone resin powder, inorganic pigments such as titanium oxide, iron oxide, ultramarine, and bitumen Organic pigments such as red 201, orange 203, yellow 4 and blue 1. Moreover, what hydrophobized these, such as a silicone process and a fatty acid process, can also be used.

  Oils used in the present invention include hydrocarbons, fats and oils, waxes, oils, vegetable oils, synthetic oils and the like, and solid oils, semi-solid oils, liquid oils, volatile oils and the like. Examples include oils such as hardened oils, ester oils, higher alcohols, silicone oils, fluorine-based oils, and lanolin derivatives.

In the present invention, a volatile solvent is added to a cosmetic base to form a slurry, and then the slurry is filled in a container, and then the solvent is removed to produce the volatile solvent. Volatile compounds having a temperature of 250 ° C. or less are preferred. Specifically, ethanol, isopropyl alcohol, water, n-butanol, low-boiling hydrocarbons such as light liquid isoparaffin, dimethylpolysiloxane having a low polymerization degree, octamethylcyclotetrasiloxane, Examples thereof include volatile silicones such as decamethylcyclopentasiloxane, low-boiling perfluoropolyethers, and the like, and one or more of these can be used. As these volatile solvents, it is preferable to select light liquid isoparaffin because the effect of preventing cracking is more excellent.
As a method for removing the solvent, there are a method in which the slurry is poured into an inner dish and then dried, or a method in which the slurry is poured and then pressurized with suction with a porous press head to remove the solvent and then dried. Can be mentioned. The blending amount of the solvent is usually 20 to 80% by weight with respect to the cosmetic base.

Next, an example is given and the present invention is explained in detail. The present invention is not limited thereby.
Examples and Comparative Examples: Solid Powder Foundation A solid powder foundation was prepared by the formulation shown in Table 1 below and the following production method, and evaluated by the evaluation methods and criteria shown below. The results are also shown in Table 1.

Table 1

(Manufacturing method)
A powder cosmetic base is obtained by uniformly mixing cosmetic powder, oil, and antioxidant. To this, light liquid isoparaffin is added in an amount of 50% by weight with respect to the powder cosmetic base, and uniformly mixed to form a slurry. This is filled in an intermediate dish and suction compression molded using a porous suction head. Thereafter, the molded product is dried at 70 ° C. for 10 hours.

(Evaluation method 1: presence or absence of cracks or gaps)
About the solid powder foundation of the said Example and comparative example, the presence or absence of the generation | occurrence | production of the crack of the surface at the time of shaping | molding and a clearance gap was confirmed visually.
<Criteria>
Existence of cracks or gaps ○: No cracks or gaps occurred ×: Cracks or gaps occurred

(Evaluation method 2; feeling of use)
Have 5 professional panelists in their 20s and 40s use the solid powder foundations of the above examples and comparative examples, assign a score according to the following evaluation criteria, calculate the average score for each foundation, Judgment was made according to the criteria shown below.
<Evaluation criteria>
[Use feeling] [score]
Very good: 5
Good: 4
Normal: 3
Somewhat bad ： 2
Bad: 1
<Criteria>
[Average score] [Judgment]
4.5 or more ◎
3.5 to less than 4.5 ○
2.5 or more and less than 3.5
Less than 2.5 ×

In Examples 1 to 10, there were no cracks or gaps, and the usability was also good. Among them, the feelings of use of Examples 1 to 4 and 6 to 9 were particularly good.
In Comparative Examples 1 to 8, cracks and gaps were observed.

Example 11
Solid powder foundation formulation Ingredients Amount (% by weight)
(1) Titanium oxide-coated sericite (Note 6) 20.00
(2) Silicone-treated pigment grade titanium oxide 10.00
(3) Silicone-treated talc Remaining amount (4) Silicone-treated mica 20.00
(5) Nylon powder 2.00
(6) Silicone-treated yellow iron oxide 1.50
(7) Silicone-treated bengara 0.50
(8) Silicone-treated black iron oxide 0.30
(9) Preservative 0.50
(10) Methylpolysiloxane 7.00
(11) Di-2-ethylhexyl succinate 4.00
(12) Vaseline 2.00
(13) Antioxidant appropriate amount (14) Perfume appropriate amount
Total 100.00
Note 6: Cover leaf CP-2035 (manufactured by Catalyst Kasei Kogyo Co., Ltd.)
(Manufacturing method)
A powder foundation was obtained by a wet molding method in the same manner as in Example 1.

Example 12
Solid white powder formulation Ingredients Amount (% by weight)
(1) Titanium oxide-coated sericite (Note 7) 10.00
(2) Silicone-treated talc Remaining amount (3) Silicone-treated mica 20.00
(4) Polymethyl methacrylate 2.00
(5) Silicone-treated yellow iron oxide 0.50
(6) Silicone-treated bengara 0.30
(7) Silicone-treated black iron oxide 0.10
(8) Preservative 0.50
(9) Methylpolysiloxane 5.00
(10) Squalane 2.00
(11) Antioxidant appropriate amount (12) Perfume appropriate amount
Total 100.00
Note 7: SMT-57S (Taika Corporation)

(Manufacturing method)
A solid white powder was obtained by a wet molding method in the same manner as in Example 1.

Both Examples 11 and 12 were good cosmetics without cracks.

Claims (6)

  A solid powder cosmetic containing a plate-like powder having an aspect ratio of 10 or more, which is not coated with a metallic oxide, and is made into a slurry by adding a volatile solvent to the cosmetic base, A solid powder cosmetic produced by filling the slurry in a container and then removing the solvent.   The solid powder cosmetic according to claim 1, wherein the metal oxide to be coated is titanium oxide.   3. The solid powder cosmetic according to claim 1, wherein the plate-like powder having an aspect ratio of 10 or more is sericite.   The solid powder cosmetic according to claim 1, 2 or 3, wherein the metal oxide to be coated is titanium oxide and the coating amount is 10 to 80% by weight based on the total amount of the composite powder.   The solid powder cosmetic according to claim 1, claim 2, claim 3, or claim 4, wherein the metal oxide to be coated is titanium oxide, and the average particle diameter of the titanium oxide to be coated is 10 to 50 nm. The solid powder cosmetic according to claim 1, claim 2, claim 3, claim 4, or claim 5, wherein the volatile solvent is light liquid isoparaffin.