JP2005179249A - Powder cosmetic - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a powder cosmetic good in spreadability on and adhesion to the skin, uniformly applicable to the skin, and excellent in moist feeling. <P>SOLUTION: The powder cosmetic contains compound powder that is obtained by blending organic flaky powder with microparticle-bearing powder obtained by bearing microparticles on organic or inorganic powder via a binder followed by compounding both of them. In this powder cosmetic, the organic flaky powder consists preferably of surfactant polyvalent metal salt powder, resin powder or amino acid-based powder, and the binder consists preferably of a film-forming polymer. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a powder cosmetic and a method for producing the same.

  Fine particle powders such as fine particle titanium oxide and fine particle zinc oxide are used in various cosmetics as UV protection agents. Further, fine particles such as zirconium oxide, cerium oxide, aluminum oxide, iron oxide (Bengara, yellow iron oxide, black iron oxide) are also blended in various cosmetics. These fine particle powders have high UV protection ability and optical characteristics, but are strongly aggregated, may cause a feeling of squeaking on the skin, and may not be stretched well.

  In order to solve these problems, composite powder in which hydrophobic fine particle titanium oxide having a specific particle size and organic spherical powder are mixed and ground, and the fine particle titanium oxide is adhered to the surface of the spherical powder (patented) Reference 1), composite powder in which the surface of silicone resin powder is coated with inorganic powder (see Patent Document 2), composite powder in which fine particle titanium oxide is adsorbed on cleaved sericite (see Patent Document 3), mica and A flaky fine powder in which inorganic compound fine particles such as titanium oxide are supported on the surface of a flaky substrate made of talc or the like (see Patent Document 4), a powder obtained by combining an organic plate powder and an ultraviolet scattering powder ( Patent Document 5) has been proposed.

Japanese Patent Laid-Open No. 61-257907 JP-A-6-1709 JP-A-6-9337 JP-A-9-132514 JP 2002-47126 A

  The above-mentioned spherical powder or silicone resin powder combined with or coated with fine particle powder has excellent UV protection and good elongation on the skin, but adheres to the skin. In addition, a feeling of bulkiness and squeaking remains in the feeling of use. When inorganic powder is coated with fine particle powder, adsorbed or supported, the adhesion to the skin is good, but the elongation on the skin is insufficient, and it feels bulky and unnatural. It will be a nice finish. Composite powder made by combining organic sheet powder with UV scattering powder has good elongation and adhesion on the skin, can be applied evenly on the skin, provides a moist feel and is natural. A cosmetic with excellent UV protection ability can be obtained. However, since the blending amount in the cosmetic is 0.1 to 90% by weight, the entire cosmetic is made by blending the remaining fine particle powder such as a coloring pigment blended for the purpose of adjusting the color. Some feeling of bulkiness and squeak may remain.

  Accordingly, an object of the present invention is to provide a powder cosmetic and a method for producing the same, which can eliminate the various disadvantages of the above-described prior art.

  The present invention relates to a fine particle-supported powder obtained by supporting fine particles having an average primary particle diameter of 0.001 to 1 μm on an organic or inorganic powder having an average primary particle diameter of 2 to 100 μm with a binder, and a minor axis having a major axis Provided is a powder cosmetic comprising a composite powder obtained by mixing an organic plate-like powder having a thickness of 1/1 to 1/100 and having a thickness of ½ or less of the major axis, and combining them. Thus, the object is achieved.

  In the present invention, fine particles having an average primary particle size of 0.001 to 1 μm are supported on an organic or inorganic powder having an average primary particle size of 2 to 100 μm by a binder to obtain a fine particle-supported powder, and then the minor axis has a major axis. To provide a method for producing a powder cosmetic comprising mixing an organic plate-like powder having a thickness of 1/1 to 1/100 and having a thickness of ½ or less of the major axis with the fine particle-supported powder, and combining them. The above-mentioned purpose is achieved.

  ADVANTAGE OF THE INVENTION According to this invention, the powder cosmetics which are excellent in the extension and sticking on skin, can apply | coat uniformly on skin, and were excellent in the moist touch.

  Hereinafter, the present invention will be described based on preferred embodiments thereof. The powder cosmetic of the present invention is obtained by mixing fine particle-supported powder obtained by supporting fine particles on an organic or inorganic powder with a binder and combining them with an organic plate-like powder. is there.

  The fine particles have an average primary particle diameter of 0.001 to 1 μm, preferably 0.001 to 0.3 μm, and more preferably 0.005 to 0.1 μm. As such fine particles, it is preferable to use scattering particles having a UV protection effect or colored pigments. Examples of such fine particles include titanium oxide, zinc oxide, zirconium oxide, cerium oxide, aluminum oxide, iron oxide (Bengara, yellow iron oxide, black iron oxide) and the like. In particular, fine particle titanium oxide and fine particle zinc oxide (for example, Japanese Patent Application Laid-Open No. 62-228006) are preferable because of their excellent ultraviolet protection ability. These fine particles can be used singly or in combination of two or more. The fine particles are preferably blended in the cosmetic of the present invention in an amount of 5 to 50% by weight, particularly 10 to 30% by weight.

  The organic or inorganic powder carrying the fine particles (hereinafter, these powders are referred to as mother powder) has an average primary particle diameter of 2 to 100 μm, preferably 5 to 30 μm, more preferably 10 to 15 μm. As the mother powder, those that are uniformly dispersed when blended in a cosmetic and impart extensibility upon application to the skin are used. As such powder, for example, polyamide, polyester, polypropylene, polystyrene, polyurethane, vinyl resin, urea resin, phenol resin, fluorine resin, silicon resin, acrylic resin, melamine resin, epoxy resin, polycarbonate resin as organic powder, Examples thereof include powders composed of divinylbenzene / styrene copolymer, silk powder, cellulose composites, and the like. On the other hand, as inorganic powder, for example, silicic acid, anhydrous silicic acid, magnesium silicate, talc, sericite, mica, kaolin, bengara, titanium coating mica, bismuth oxychloride, zirconium oxide, magnesium oxide, zinc oxide, titanium oxide, Examples thereof include powders made of aluminum oxide, calcium sulfate, barium sulfate, magnesium sulfate, calcium carbonate, magnesium carbonate, iron oxide, ultramarine, calamine, carbon black, and composites thereof. These mother powders can be used singly or in combination of two or more. The mother powder is preferably blended in the cosmetic composition of the present invention in an amount of 20 to 80% by weight, particularly 30 to 50% by weight.

  The fine particles and the mother powder are each roughly mixed using a rocking mixer or the like after weighing a predetermined amount. The coarsely mixed powder is finely pulverized using a hammer mill or the like. In this case, when a powder other than the fine particles and the mother powder (excluding the organic plate-like powder described later) is blended in the target cosmetic, the powder is also mixed with the fine particles and the mother powder. It is preferable to be mixed. As a result, in the process described later, among the powders contained in the powder cosmetic, all the powders other than the mother powder and the organic plate-like powder described later are supported on the mother powder. This is because an even better cosmetic can be obtained.

  The fine particles are supported on the mother powder by the binder. The binder is not particularly limited as long as it can support fine particles on the mother powder. For example, a film-forming polymer can be used. The binder is preferably used in a state dissolved or dispersed in a hydrous volatile solvent.

  Examples of the film-forming polymer include a polymer obtained by polymerizing one or more monomers having a polymerizable double bond and having a molecular weight of about 10,000 to 1,000,000. JP-A-5-112423, page 10, line 10 to page 10, line 20; JP-A-7-133352, page 11, line 25 to item 11, line 40; and JP-A-10-95705, line 17, item 17. The poly (N-acylalkylenimine) -modified silicone described in Line 11 to Item 17, Line 26 can also be used. Furthermore, the vinyl silicone block polymer etc. which are described in Unexamined-Japanese-Patent No. 11-100307, 6th item 27 line-6th item 41 line can also be used. As the water-containing volatile solvent for dissolving or dispersing the film-forming polymer, water, an aqueous alcohol solution, or the like can be used.

  The amount of the binder used is preferably 10 to 40% by weight, particularly 20 to 30% by weight, based on the total weight of the fine particles and the mother powder, from the viewpoint of reliably supporting the fine particles on the mother powder.

  The fine particles and the mother powder are mixed with a binder using a Henschel mixer or the like. There are no particular restrictions on the mixing conditions, but the mixture is sufficiently mixed so that the fine particles supported on the mother powder are not separated in a subsequent step. For example, when a 2 liter Henschel mixer is used, it is preferable to mix for 10 to 30 minutes at a rotation speed of 3000 to 6000 rpm.

  After the mixing is completed, the water-containing volatile solvent is removed by drying to obtain a powder in which the fine particles are supported on the mother powder (hereinafter referred to as a fine particle-supported powder). When the mixing is performed while heating, a drying step after mixing is not necessarily required. Drying is preferably performed until the water content in the fine particle-supported powder is 0.1% or less. Specifically, for example, drying is preferably performed at 40 to 100 ° C. and normal pressure for about 1 to 6 hours.

  After drying, the fine particle-supported powder is finely pulverized. Fine grinding can be performed using a hammer mill or the like. The pulverization is performed under the condition that the fine particles are not separated from the mother powder.

  Next, the fine particle-supported powder is mixed with the organic plate-like powder and combined. As a result of the composite, the fine particle-supported powder is coated with the constituent material of the organic plate-like powder to obtain a composite powder. By this coating, it is possible to prevent a decrease in feel caused by the fine particles without impairing the action (for example, the ultraviolet ray protecting action) of the fine particles. Therefore, the stretch / attachment on the skin is good, it can be uniformly applied to the skin, and a moist feel cosmetic is obtained. On the other hand, in conventional powder cosmetics, fine particles are present on the surface of the mother powder, resulting in a decrease in touch, and the fine particles are likely to be unevenly distributed around the mother powder. The ultraviolet protective effect and the like of the fine particles were likely to be lowered.

  Composite means that the fine particle-supported powder and the organic plate-like powder are physically bonded. Each powder does not need to maintain the original shape. From the viewpoint of enhancing the feeling of use of the cosmetic, it is preferable to make a composite while maintaining the shape of the organic plate-like powder as much as possible. It can be confirmed by electron microscope observation that both powders are combined. When it is combined, it has an appearance in which organic plate-like powder adheres to the surface of the fine particle-supported powder.

  In the composite powder, it is preferable that the entire surface of the fine particle-supported powder is substantially covered with the constituent material of the organic plate-like powder, and the fine particles exposed on the surface are not substantially present. However, even if a small amount of fine particles are inevitably exposed on the surface, the effect of the present invention is not impaired.

  The organic plate-like powder has a minor axis that is 1/1 to 1/100, preferably 1/1 to 1/50, particularly preferably 1/1 to 1/10 of the major axis, from the viewpoint of use feeling. Is 1/2 or less of the major axis, preferably 1/2 to 1/100, particularly preferably 1/2 to 1/50. For the major axis, minor axis, and thickness of the powder, the respective dimensions of 300 powders were measured by transmission electron micrographs, and average values were used. The major axis and minor axis refer to the length of the long side and the short side of the plate-like surface of the plate-like powder, and have a relationship of major axis ≧ minor axis> thickness. Each dimension has a major axis of 0.1 to 100 μm, particularly 1 to 50 μm, a minor axis of 0.1 to 100 μm, particularly 1 to 50 μm, and a thickness of 0.05 to 50 μm, particularly 0.05 to 10 μm. Is preferable from the viewpoint of use feeling. These organic plate-like powders preferably have an average primary particle diameter of 0.1 to 100 μm, particularly 1 to 50 μm, and more preferably 1 to 20 μm from the viewpoint of the feeling of use.

  In the present invention, the average primary particle diameter of the particles is an average volume diameter obtained by a laser scattering method for powders of 1 μm or less using SK laser micron sizer manufactured by Seishin Enterprise using ethanol as a dispersion medium. For powders of more than 1 μm, the average volume diameter determined by the laser diffraction method using the same measuring device.

  The organic plate-like powder can be used alone or in combination of two or more. The organic plate-like powder is preferably blended in the cosmetic composition of the present invention in an amount of 5 to 50% by weight, particularly 15 to 25% by weight.

  Examples of the organic plate-like powder include one or more substances selected from surfactant polyvalent metal salt powders, resin powders and amino acid powders that are generally insoluble in water and oil.

  Examples of the surfactant polyvalent metal salt include polyvalent metal salts such as zinc, calcium, magnesium, barium and strontium which are surfactants having a hydrophobic group having 8 to 22 carbon atoms, preferably 10 to 18 carbon atoms. Specifically, (mono) alkyl phosphate polyvalent metal salts such as sodium monocetyl zinc phosphate, zinc monolauryl phosphate, calcium monolauryl phosphate; calcium dodecylbenzenesulfonate, N-lauroyl-taurine calcium, N-palmitoyl-taurine Sulfonic acid polyvalent metal salts such as calcium; acylated amino acid polyvalent metal salts such as N-lauroyl-β-alanine calcium, N-lauroyl-β-alanine zinc, and N-lauroylaminohexanoic acid calcium; lauryl sulfate calcium, Examples include sulfate polyvalent metal salts such as myristyl sulfate calcium.

  Examples of the resin powder include flat or plate-like resin powders such as polyethylene, polypropylene, nylon, polymethyl methacrylate, benzoguanamine resin, polystyrene, divinylbenzene / styrene copolymer, and ethylene tetrafluoride (for example, JP JP-A-57-78466, JP-A-62-190112, JP-A-62-104706).

  Examples of amino acid-based powders include N-acyl lysine such as Nε-lauroyl lysine, Nε-palmitoyl lysine and Nε-caproyl lysine, N-acylortinin such as Nα-stearoylortinin, and N-acyl lysine such as Nγ-palmitoyl-α and γ-diaminobutyric acid. N-acyl basic amino acids such as acyldiaminobutyric acid, N-acylarginine such as Nε-lauroylarginine, N-acylhistidine such as Nα-cocoylhistidine (for example, JP-A-60-67406, JP-A-5-58842) Gamma), α-amino fatty acids such as α-aminocaprylic acid and α-aminolauric acid (Japanese Patent Laid-Open No. Sho 62-42111), and Amihop LL manufactured by Ajinomoto Co., Inc. is used as a commercial product. Can do.

  These organic plate-like powders may be used in combination of two or more. In particular, use of sodium cetyl phosphate, N-lauroyl taurine calcium, and N-acyl lysine is preferable from the viewpoint of use feeling such as elongation, stickiness, and moist feeling.

  For example, a Henschel mixer can be used for mixing the fine particle-supported powder and the organic plate-like powder. Mixing is performed under conditions such that the fine particle-supported powder is completely covered with the constituent material of the organic plate-like powder. For example, when a 2 liter Henschel mixer is used, it is preferable to mix for 5 to 30 minutes at a rotational speed of 1000 to 6000 rpm.

  When mixing the fine particle-supported powder and the organic plate-like powder, it is preferable to mix the oil agent together. The oil agent is blended for the purpose of improving the adhesion between the cosmetic and the skin. Further, when the cosmetic is solid, it is also added for the purpose of improving the shape retention of the cosmetic. As the oil agent, for example, petroleum oil such as petrolatum, higher fatty acid, liquid paraffin, ester oil and silicone oil, fluorine oil such as perfluoropolyether and perfluorodecalin can be used. These oil agents may be used alone or in combination of two or more. The oil agent is preferably blended in the cosmetic up to about 30% by weight, particularly 20% by weight or less, and further 10% by weight or less.

  The obtained composite powder is sieved. Various sieves can be used for sieving. Although it depends on the specific use of the cosmetic, it is generally preferable to use a sieve having an opening of 100 to 425 μm.

  The sieved composite powder may be packed in a container as it is to make a powder cosmetic, or may be made into a solid powder cosmetic filled in a shallow container and press-molded. In the case of pressure molding, any known press molding apparatus may be used to perform pressure molding at a pressure that matches the feeling of use.

  In the cosmetic thus obtained, among the powders blended in the cosmetic, all powders (particularly all fine particles) other than the organic plate-like powder are supported on the mother powder. Since it is covered with the constituent material of the organic plate-like powder, the feeling caused by the fine particles is prevented from being lowered. Therefore, the squeaky feeling when applying the cosmetic is reduced as compared with the prior art. Further, the elongation and sticking of the cosmetic becomes better than before, and the cosmetic can be uniformly applied to the skin. Thus, in the cosmetics of this invention, it is preferable that powder other than composite powder is not contained substantially.

  The present invention can be suitably applied to solid powder cosmetics such as foundations and eye shadows, and powder cosmetics such as loose powders.

  Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. However, the scope of the present invention is not limited to such examples.

[Example 1]
The mother powder and fine particles having the blending ratios shown in Table 1 were roughly mixed using a rocking mixer and then finely pulverized using a hammer mill. Binders shown in the same table were added to the obtained mixed powder and mixed using a 2 liter Henschel mixer. The mixing condition was 30 minutes at 5000 rpm. After mixing, drying was carried out at 70 ° C. and normal pressure for 3 hours, followed by pulverization using a hammer mill. As a result, a fine particle-supported powder was obtained.

  To the resulting fine particle-supported powder, the organic plate-like powder and oil agent having the blending ratio shown in Table 1 were added and mixed using a 2 liter Henschel mixer. The mixing conditions were 3000 rpm for 20 minutes. Thus, a composite powder was obtained. The obtained composite powder was sieved and then filled into a shallow container and pressure-molded. Thus, a solid powder cosmetic was obtained.

About the obtained cosmetics, sensory evaluation was performed by 20 professional panelists about the touch, the elongation on the skin, the attachment to the skin, and the lack of roughness. The evaluation criteria are as follows. The results are shown in Table 1.
◎: Evaluated that 16 or more are good ○: Evaluated that 11-15 were good △: Evaluated that 6-10 were good ×: Evaluated that 5 or less were good

[Comparative Example 1]
All powders shown in Table 1 were mixed with the oil. For mixing, 2 liters of Henschel was used. The mixing condition was 20 minutes at 3000 rpm. The obtained mixed powder was sieved and then filled into a shallow container and pressure-molded. The conditions for sieving and pressure molding were the same as in Example 1. Thus, a solid powder cosmetic was obtained. Evaluation similar to Example 1 was performed about the obtained cosmetics. The results are shown in Table 1.

As is apparent from the results shown in Table 1, the cosmetic material obtained in Example 1 has a feel, elongation on the skin, adhesion to the skin, and the like compared with the cosmetic material obtained in Comparative Example 1. It turns out that it is excellent about all the items of non-sacrifice.

Claims (8)

  A fine particle-supported powder obtained by supporting fine particles having an average primary particle diameter of 0.001 to 1 μm on an organic or inorganic powder having an average primary particle diameter of 2 to 100 μm with a binder; A powder cosmetic comprising a composite powder obtained by mixing 1/100 and an organic plate-like powder having a thickness of ½ or less of the major axis and combining them.   The powder cosmetic according to claim 1, wherein the organic plate-like powder is composed of one or more selected from surfactant polyvalent metal salt powder, resin powder and amino acid powder.   The powder cosmetic according to claim 2, wherein the surfactant polyvalent metal salt is a polyvalent metal salt of a surfactant having a hydrophobic group having 8 to 22 carbon atoms.   The method for producing a powder cosmetic according to any one of claims 1 to 3, wherein the binder comprises a film-forming polymer.   The powder cosmetic according to any one of claims 1 to 4, wherein the fine particles are ultraviolet scattering particles or colored pigments.   Fine particles having an average primary particle size of 0.001 to 1 μm are supported on an organic or inorganic powder having an average primary particle size of 2 to 100 μm by a binder to obtain a fine particle-supported powder, and then the minor axis is 1/1 to 1 of the major axis / 100 and a method for producing a powder cosmetic, in which an organic plate-like powder having a thickness of ½ or less of the major axis is mixed with the fine particle-supported powder and combined.   Of the powder contained in the powder cosmetic, all the powders other than the organic or inorganic powder and the organic plate powder are supported on the organic or inorganic powder to obtain the fine particle-supported powder. The manufacturing method of the powder cosmetics of Claim 6. The method for producing a powder cosmetic according to claim 6 or 7, wherein an oil agent is also mixed at the time of mixing the organic plate-like powder and the fine particle-supported powder.