JP6467100B1 - Composite powder and cosmetics containing the same - Google Patents

Abstract

【Task】
It is an object of the present invention to provide a composite powder and a cosmetic containing such a composite powder that have a good use feeling despite exhibiting high sebum solidifying ability.
[Solution]
(Acrylates / ethyl hexyl acrylate) Provided are composite powder obtained by coating 0.2 to 2 parts by mass of zinc oxide with respect to 1 part by mass of a crosspolymer, and a cosmetic containing the composite powder.
[Selection figure] None

Description

  The present invention relates to a composite powder and a cosmetic containing the same.

  Since cosmetics are applied to human skin and used, resistance to sweat and sebum from the skin is required, and it is generally required that oil does not float and the makeup does not collapse. In order to satisfy such demands, studies have been made to prevent makeup collapse by making various improvements to powders used in cosmetics.

  For example, a method of blending inorganic porous powders such as porous silica and porous spherical magnesium carbonate into cosmetics can be mentioned, but these powders absorb moisture on the skin and lack emollient components in the skin. There is a problem of causing dryness and itching of the skin (Patent Document 1 and Patent Document 2). In addition, although organic powders such as acrylic polymers are used as sebum adsorbents, development of materials having a sebum adsorbing ability superior to these sebum adsorbents is expected.

  On the other hand, zinc oxide is used as a white pigment or an ultraviolet shielding material depending on the particle size in the cosmetics field. For example, it is known that particulate zinc oxide improves the longevity of cosmetics by reacting with fatty acids in sebum to fix sebum and suppress the spread of sebum. (Patent Document 3) However, such a fine particle zinc oxide has a drawback in that when it is blended in cosmetics, it feels squeaky and is inferior in touch. For this reason, if the zinc oxide particle which is excellent in touch and has high sebum adsorption ability can be obtained, it will become a very useful material in the cosmetics field.

JP 2009-137806 A JP 2006-096706 A JP-A-8-41379

  It is an object of the present invention to provide a composite powder and a cosmetic containing such a composite powder that have a good use feeling despite exhibiting high sebum solidifying ability.

(Acrylates / ethyl hexyl acrylate) Provided are composite powder obtained by coating 0.2 to 2 parts by mass of zinc oxide with respect to 1 part by mass of a crosspolymer, and a cosmetic containing the composite powder.

  The powder of the present invention exhibits a high sebum solidifying effect. A cosmetic compounded with such a composite powder is less likely to collapse sebum, exhibits a high makeup-holding effect, and exhibits an effect of good use feeling.

  Hereinafter, modes for carrying out the present invention will be described.

  The composite powder of the present invention is a composite powder obtained by coating 0.2 to 2 parts by mass of zinc oxide with respect to 1 part by mass of (acrylates / ethylhexyl acrylate) crosspolymer.

  The (polymers / ethylhexyl acrylate) crosspolymer used in the present invention is not particularly limited as long as it can be usually blended in cosmetics. The average particle diameter of the (acrylates / ethylhexyl acrylate) crosspolymer is 5 to 20 μm, preferably 5 to 10 μm. Commercially available products can be used, and examples thereof include techpolymer ACX-806C, techpolymer ACX-1502C (manufactured by Sekisui Plastics Co., Ltd.), MAKIBEADS SP10 (manufactured by Daito Kasei Kogyo Co., Ltd.), and the like. These particle diameters can be measured with a laser diffraction / scattering particle size distribution analyzer.

  The zinc oxide used in the present invention is not particularly limited as long as it can be blended in cosmetics. Although the shape of zinc oxide is not particularly limited, the average particle size is 10 to 200 nm, preferably 15 to 100 nm, and more preferably 15 to 50 nm, from the viewpoint of sebum solidifying ability.

  Although untreated zinc oxide can be used as it is as zinc oxide, it is preferable to use zinc oxide that has been subjected to a hydrophobic treatment. The hydrophobizing agent is not particularly limited, and examples thereof include dimethicone, methylhydrogen polysiloxane, and metal soap. Among these hydrophobizing agents, it is preferable to use methyl hydrogen polysiloxane. The coating amount of the hydrophobizing agent may be an amount sufficient to hydrophobize zinc oxide. Specifically, the quantity ratio between zinc oxide and the hydrophobizing agent is preferably 85:15 to 99: 1, and more preferably 90:10 to 98: 2.

  The composite powder of the present invention covers 0.2 to 2 parts by mass, preferably 0.3 to 1.5 parts by mass of zinc oxide with respect to 1 part by mass of (acrylates / ethylhexyl acrylate) crosspolymer.

  As the coating method, various known methods such as physicochemical mixing and grinding (dry type, wet type) and chemical deposition method are selected and implemented. Therefore, a dry mixed milling method is advantageously used.

  Cosmetics can be produced using the composite powder. By containing the composite powder, this cosmetic has sebum solidifying ability and exhibits an excellent makeup-holding effect.

  As a compounding quantity to the cosmetics of composite powder, 0.5-90 mass% is preferable. When the blending amount is less than 0.5% by mass, the sebum solidifying ability of the composite powder tends to be hardly exhibited in the cosmetic. On the other hand, when a composite powder exceeding 90% by mass is blended, formulation tends to be difficult.

  The use of the cosmetic of the present invention is not particularly limited, but is suitable for makeup cosmetics such as foundations, foundation cosmetics, and sunscreen cosmetics from the viewpoint of its effects.

  The dosage form of the cosmetic of the present invention is not particularly limited, and examples thereof include powder cosmetics, emulsified cosmetics, and two-layer cosmetics.

  The cosmetic of the present invention is an aqueous component, a humectant, an oily component, a pigment, a surfactant, an ultraviolet absorber, a thickener, a cosmetic component, which is usually blended as needed in addition to the composite powder Perfumes, polymer substances, antibacterial and antibacterial agents, alcohols, powders, scrub agents, living body-derived components and the like can be appropriately blended.

  EXAMPLES Hereinafter, the present invention will be specifically described with reference to examples, but the scope of the present invention is not limited thereby. The blending amount is mass% unless otherwise specified.

Composite powder Composite powder was obtained by mixing the core powder shown in Table 1 and zinc oxide for 2 hours using a blender. When this composite powder was observed with a microscope, the core powder was covered with zinc oxide. As zinc oxide, zinc oxide having an average particle diameter of 25 μm treated with 5% dimethicone was used.

(Oleic acid solidification test)
(A) In a 20 mL beaker, 5 g of oleic acid (Miyoshi oil and fat PM810) and 1 g of ion-exchanged water are weighed and heated to 35 to 40 ° C. with a hot plate set at 40 ° C.
(B) Add 0.5 g of the composite powder to (a) and stir for 30 seconds using a spatula to make it homogeneous.
(C) After stirring, a stirrer is quickly put in and stirred with a stirrer (200 rpm). The time from the stirring start time until the gelation of oleic acid progressed and the rotation of the stirring bar ceased was measured and set as the solidification time.

  As shown in Table 1, the composite powder of the acrylates / ethylhexyl acrylate crosspolymer and zinc oxide was shown to have a very fast oleic acid solidification time and an excellent sebum solidification effect.

  A press-type foundation was prepared by a conventional method with the formulation shown in Table 2.

(Evaluation method)
Three professional evaluators of make-up cosmetics used Example 3 and Comparative Example 20 in half-face to evaluate the feeling of use during use and sebum collapse after 3 hours in a room under high temperature and high humidity. Which was better was evaluated.

  As shown in Table 2, it was shown that Example 3 in which the composite powder of the present invention was blended was less likely to collapse sebum and had a good feel to use.

[Example 4] Powder foundation (1) Composite powder (Example 2) 5.0 (mass%)
(2) Dimethicone-treated titanium oxide 5.0
(3) Dimethicone-treated fine particle titanium oxide 10.0
(4) Magnesium stearate 5.0
(5) Dimethicone-treated talc Amount based on 100 (6) Dimethicone-treated yellow iron oxide Appropriate amount (7) Dimethicone-treated Bengala Appropriate amount (8) Dimethicone-treated black iron oxide Appropriate amount (9) Alkyl polyacrylate 5.0
(10) Dimethicone-treated mica 15.0
(11) Dimethicone 10.0
(12) Paraffin wax 1.0
(13) 2-ethylhexyl stearate 5.0
Production method: (1) to (10) are mixed and homogenized, and then the components (11) to (13) at 75 ° C. are heated and dissolved to add and knead. After pulverizing with an atomizer and sieving, it is press-molded into a metal pan.

[Example 5] Oily foundation (compact type)
(1) Composite powder 1 (Example 2) 5.0 (mass%)
(2) Dimethicone-treated talc Amount based on 100 (3) Dimethicone-treated mica 15.0
(4) Dimethicone-treated yellow iron oxide appropriate amount (5) Dimethicone-treated bengara appropriate amount (6) Dimethicone-treated black iron oxide appropriate amount (7) Solid paraffin 3.0
(8) Microcrystalline wax 6.0
(9) Beeswax 2.0
(10) Vaseline 12.0
(11) Squalane 6.0
Production method: (1) to (6) are mixed and homogenized, and then the components (7) to (11) dissolved by heating are added and kneaded by a roll mill. The kneaded product is re-melted and slowly stirred to raise the foam, then cooled, poured into a container at 60 ° C., allowed to cool and solidify.

[Example 6] Spot-sticking stick (1) Talc 5.8 (mass%)
(2) Kaolin Total amount of 100 (3) Mica 3.0
(4) Yellow iron oxide appropriate amount (5) Bengala appropriate amount (6) Black iron oxide appropriate amount (7) Composite powder 1 (Example 2) 4.0
(8) Titanium dioxide 6.0
(9) Solid paraffin 3.0
(10) Microcrystalline wax 7.0
(11) Vaseline 15.0
(12) Methylphenylpolysiloxane 3.0
(13) Squalane 5.0
(14) Isopropyl palmitate 17.0
Manufacturing method: (9) to (14) are dissolved at 85 ° C., and the components (1) to (8) mixed and homogenized are added with stirring. Grind and disperse in a colloid mill. After degassing, pour into a container at 70 ° C. and cool.

[Example 7] O / W emulsified foundation (1) Talc 3.0 (mass%)
(2) Yellow iron oxide appropriate amount (3) Bengala appropriate amount (4) Black iron oxide appropriate amount (5) Composite powder 1 (Example 2) 3.0
(6) Kaolin 0.5
(7) Polyoxyethylene sorbitan monostearate 0.9
(8) Triethanolamine 1.0
(9) Propylene glycol 10.0
(10) Purified water Amount based on 100 (11) Stearic acid 2.2
(12) Isohexadecyl alcohol 7.0
(13) Glycerol monostearate 2.0
(14) Liquid lanolin 2.0
(15) Liquid paraffin 8.0
Production method: Disperse (6) in (9) and add to (10), treat with homomixer at 70 ° C., add (7) and (8), and stir well. (1) to (5) mixed and homogenized are added to this and mixed uniformly with a homomixer. Add the components (11) to (15) dissolved and homogenized by heating at 75 ° C., emulsify with a homomixer, and cool.

[Example 8] W / O emulsion type foundation (1) Sericite 10.0 (mass%)
(2) Yellow iron oxide appropriate amount (3) Bengala appropriate amount (4) Black iron oxide appropriate amount (5) Composite powder 1 (Example 2) 2.0
(6) Decamethylcyclopentasiloxane 12.0
(7) Polyoxyethylene-modified dimethylpolysiloxane 4.0
(8) Purified water Amount based on 100 (9) 1,3-butylene glycol 5.0
(10) Sodium chloride 2.0
Production method: (8) to (10) are heated and dissolved and homogenized, and (1) to (5) are added and dispersed uniformly with a homomixer. Add uniformly dissolved components (6) and (7), and after emulsification with a homomixer, cool.

[Example 9] O / W emulsion type sunscreen cream (1) Oxybenzone 2.0 (mass%)
(2) Octyl paramethoxycinnamate 5.0
(3) Squalane 10.0
(4) Vaseline 5.0
(5) Stearyl alcohol 3.0
(6) Stearic acid 3.0
(7) Glycerin monostearate 3.0
(8) Polyethyl acrylate 1.0
(9) Purified water Amount based on the total amount of 100 (10) 1,3-butylene glycol 7.0
(11) Fine particle titanium oxide 3.0
(12) Composite powder 1 (Example 2) 2.0
(13) Triethanolamine 1.0
Production method: (9) to (13) were mixed and then homogeneously dispersed using a homomixer, and then heated and dissolved to 75 ° C. The components (1) to (8) were added to the homomixer. Cool after emulsification.

[Example 10] W / O emulsion type sunscreen emulsion (1) Octyl paramethoxycinnamate 5.0 (mass%)
(2) Oxybenzone 3.0
(3) 4-tert-butyl-4′-methoxybenzoylmethane 1.0
(4) Dimethicone-treated fine particle titanium oxide 5.0
(5) Composite powder 1 (Example 2) 5.0
(6) Squalane 20.0
(7) Dimethicone in a total amount of 100 (8) Silicone resin 2.0
(9) Glycerin diisostearate 2.0
(10) Organically modified montmorillonite 0.5
(11) Purified water 28.5
(12) 1,3-butylene glycol 5.0
Production method: (1) to (10) are heated and dissolved, mixed and then homogeneously dispersed using a homomixer, uniformly dissolved (11) and (12) are added, and the mixture is emulsified with a homomixer and cooled.

Claims (2)

A composite powder in which 0.2 to 2 parts by mass of dimethicone-treated zinc oxide is coated on 1 part by mass of a porous spherical (acrylates / ethylhexyl acrylate) crosspolymer.   A cosmetic comprising the composite powder according to claim 1.