JP2003342409A - Porous particle and production method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a porous particle occluding solid particles therein and having oil absorbability without swelling, a cosmetic containing the porous particle, and a method for producing the porous particle at a low cost. <P>SOLUTION: The porous particle comprises a crystalline thermoplastic resin containing solid particles with 0.001-10 μm size. The cosmetic comprises the porous particle. The method for producing the porous particle comprises the steps of mixing the crystalline thermoplastic resin, the solid particles with 0.001-10 μm size and a low molecular weight compound having a melting point lower than the softening point (or the melting point) of the resin at a temperature higher than the softening point (or the melting point) of the resin, atomizing the mixture in a gas phase and removing the low molecular weight compound from the obtained particle. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a porous particle useful for cosmetics and the like, a method for producing the same, and a cosmetic containing the same.

[0002]

2. Description of the Related Art Porous particles have been developed in the past. Patent No. 2550262
In the publication, an oil absorbing agent composed of an organic acid metal salt and an oil-absorbing cross-linked polymer, which absorbs a large amount of oil and swells, and has excellent oil retaining performance of the absorbed oil, and significantly improves the oil absorbing speed. An oil absorbent is disclosed. However, since it is a swelling type, the particle shape changes due to oil absorption, and therefore the feel on the skin is not satisfactory. Further, the manufacturing method is not simple and there is a problem that the cost is increased. Further, there was no example in which solid particles were included in the particles.

An object of the present invention is to provide a porous particle which does not swell and has oil absorbency and which contains solid particles, a cosmetic material containing the same, and an inexpensive production method thereof.

[0004]

The present invention has a particle size of 0.00
Porous particles made of crystalline thermoplastic resin containing solid particles of 1 to 10 μm, and cosmetics containing the porous particles, and crystalline thermoplastic resin, particle size 0.001
Solid particles of 10 μm and a low molecular weight compound having a melting point lower than the softening temperature (or melting point) of the resin are mixed at a temperature equal to or higher than the softening temperature (or melting point) of the resin, and then sprayed in a gas phase to obtain The method is a method for producing porous particles, in which the low molecular weight compound is removed from the obtained particles.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION [Porous Particles] The porous particles of the present invention are crystalline thermoplastic resins containing solid particles, and the content of solid particles in the porous particles of the present invention is crystalline. 1 to 200 parts by mass is preferable, and 10 to 150 parts by mass is more preferable, and 3 to 100 parts by mass of the thermoplastic resin.
0 to 90 parts by mass is particularly preferable.

The average particle size of the porous particles of the present invention is 0.1 to 1 because there is no rough feeling or squeaky feeling to the touch.
00 μm is preferable, and 1 μm to 50 μm is more preferable.

This average particle diameter is a weight average particle diameter measured at room temperature (20 ° C.) of an ethanol suspension of particles with a laser diffraction type particle size distribution measuring device (LS-230, manufactured by Coulter) ( A relative refractive index of 1.2 was used).

The shape of the porous particles of the present invention is not particularly limited, but spherical particles are preferable because they have a good feel on the skin.

The pore surface area of the porous particles of the present invention is 10 to 30 as a value determined by the mercury intrusion method described later.
0 m ² / g, more preferably from ^{10~100m 2 / g, 20~80m 2 /} g is particularly preferred.

The porous particles of the present invention have oil absorption. Further, the porous particle of the present invention preferably further contains an oil agent, and when it contains an oil agent, it also functions as a release agent for the oil agent.

The content of the oil agent in the porous particles of the present invention is
10 to 1, based on 100 parts by mass of the crystalline thermoplastic resin
000 parts by mass is preferable, and 100 to 900 parts by mass is more preferable.

[Crystalline Thermoplastic Resin] In the present invention,
The crystalline thermoplastic resin means that a part or all of the thermoplastic resin is a crystalline resin. That is, even if all of the thermoplastic resin has crystallinity,
Further, only a part of the thermoplastic resin may have crystallinity. The crystalline thermoplastic resin of the present invention preferably has a crystallinity index of 0.5 or more, more preferably 0.7 or more.

The crystallinity index is obtained from the Polymer Analysis Handbook (page 235, issued on January 25, 1985, Asakura Shoten Co., Ltd. editor: Japan Society of Analytical Chemistry, Polymer Analysis Research Round Table).
Therefore, the value obtained by the following formula was used.

Crystallinity index = [(d-da) / (dc-d)
a)] × (dc / d) [wherein, d is the measured density of the thermoplastic resin, da is the density of the amorphous part, and dc is the density of the crystal part. Density is measured according to JIS K6760. The molecular weight of the crystalline thermoplastic resin is 1,000 to 20,000 in order to make the viscosity of the crystalline thermoplastic resin and the low molecular weight compound melt preferably 600 mPa · s or less in the method for producing porous particles described below. Is preferred, 1,000
〜10,000 is more preferable. The molecular weight of the crystalline thermoplastic resin can be determined by a viscosity method or a vapor osmotic pressure method.

The melting point (or softening temperature) of the crystalline thermoplastic resin is preferably 80 ° C. or higher, more preferably 120 ° C. or higher, from the viewpoint of easy production of the porous particles. There is no particular upper limit, but 200 ° C. or lower is preferable from the viewpoint of thermal decomposability.
The melting point of the crystalline thermoplastic resin is JIS K0064: 1.
It is the value measured by 992.

The crystalline thermoplastic resin used in the present invention is preferably one or more selected from polyolefins, polyamides, polyesters and polyacetals.

As the polyolefin, polyethylene,
Examples thereof include olefin homopolymers such as polypropylene, poly-1-butene, polymethylpentene, polymethylbutene, and polybutadiene, olefin copolymers such as propylene / ethylene random copolymer, and the like. Polyethylene, polypropylene, poly- 1-butene is particularly preferred. Further, it may have a fluorine atom, and examples thereof include polytetrafluoroethylene (PTFE).

Examples of polyamides include aliphatic polyamides such as nylon-6, nylon-66, nylon-10, nylon-12 and nylon-46, and aromatic polyamides produced from aromatic dicarboxylic acids and aliphatic diamines. Nylon-6 is particularly preferred.

Examples of polyesters include aromatic polyesters such as polyethylene terephthalate, polyethylene naphthalate and polybutylene terephthalate, polycaprolactone and polyhydroxybutyrate, with polyethylene terephthalate being particularly preferred.

Examples of the polyacetal include polyformaldehyde (polyoxymethylene), polyacetaldehyde, polypropionaldehyde and polybutyraldehyde, and polyformaldehyde is particularly preferable.

The above-mentioned crystalline thermoplastic resins may be used alone or in combination of two or more kinds.
Of these crystalline thermoplastic resins, polyolefins, particularly polyethylene and polypropylene, are preferred. Further, the polyolefin is preferably linear.

Vinyl chloride resin in crystalline thermoplastic resin,
The content of other resins such as ABS resin is preferably 50% by mass or less, and more preferably 20% by mass or less. It is preferable that the content of the crystalline resin is large, because it is easy to form a communication structure in which the resin is connected to each other through the open holes.

[Solid Particles] The particle diameter of the solid particles used in the present invention is such that the spray nozzle is not clogged, and regarding the metal oxide, its UV protection ability, antibacterial ability and deodorant ability are advantageously exhibited. Therefore, it is preferably 10 μm or less,
More preferably 1 μm or less, particularly preferably 0.3 μm
It is the following. The lower limit is preferably 0.001 μm or more,
0.01 μm or more is more preferable.

The solid of the solid particles means that the melting point and the decomposition temperature are room temperature (25 ° C.) or higher. The melting point (or decomposition temperature) of the solid particles does not melt or decompose in the manufacturing process, From the viewpoint of easily maintaining the shape in the porous particles, it is preferably at least the melting point (or softening temperature) of the crystalline thermoplastic resin containing solid particles,
150 ° C or higher is more preferable, and 300 ° C or higher is particularly preferable. The shape of the solid particles is not particularly limited. The solid particles may be either organic particles or inorganic particles.

Examples of the organic particles include crosslinked acrylic resins such as crosslinked methyl methacrylate, crosslinked urea resins, crosslinked melamine resins, crosslinked phenol resins and crosslinked styrene resins, and inorganic particles include aluminum hydroxide and hydroxide. Metal hydroxides such as calcium, magnesium hydroxide and zinc hydroxide; aluminum oxide, calcium oxide,
Metal oxides such as magnesium oxide, zinc oxide, titanium oxide and cerium oxide; aluminum sulfate, potassium aluminum sulfate, aluminum carbonate, aluminum chloride,
Calcium sulfate, calcium carbonate, calcium chloride, magnesium acetate, magnesium sulfate, magnesium carbonate, magnesium chloride, zinc acetate, zinc sulfate, zinc carbonate, zinc chloride, metal inorganic salts such as aluminum metasilicate, aluminum acetate, calcium acetate, aluminum glycy Metal organic salts such as nates, silica, kaolinite,
Examples thereof include inorganic minerals such as talc. Inorganic particles are preferable, metal oxides are more preferable, and at least one metal oxide selected from the group consisting of zinc oxide, titanium oxide and cerium oxide is particularly preferable. These solid particles function as a reinforcing agent for the porous particles, and the metal oxide has UV protection ability, antibacterial ability, deodorant ability and the like, and is therefore preferable as a cosmetic.

In the case of organic particles, the particle size of the solid particles is the above-mentioned laser diffraction type particle size distribution measuring device (LS-2).
No. 30, manufactured by Beckman Coulter, Inc.) is a weight average particle diameter of an ethanol suspension of particles measured at room temperature (20 ° C.) (relative refractive index 1.2). It is a weight average particle diameter measured by a particle size distribution measuring device (Microtrac particle size analyzer UPA250, manufactured by Nikkiso Co., Ltd.) at 20 ° C.

[Production Method of Porous Particles] The porous particles of the present invention have a crystalline thermoplastic resin, solid particles having a particle size of 0.001 to 10 μm, and a melting point lower than the softening temperature (or melting point) of the resin. The low molecular weight compound is mixed at a temperature equal to or higher than the softening temperature (or melting point) of the resin, preferably at a temperature of 200 ° C. or lower from the viewpoint of thermal stability, and then sprayed in a gas phase to obtain the obtained particles. It is obtained by removing the low molecular weight compound.

Specifically, first, a crystalline thermoplastic resin and a low molecular weight compound having a melting point lower than the softening temperature (or melting point) of the resin are mixed at a temperature equal to or higher than the softening temperature (or melting point) of the resin. . Then, the solid particles are mixed and uniformly mixed using a disperser such as a mortar and a three-roll mill. The mixing ratio of the low molecular weight compound at this time is from the viewpoint of obtaining porous particles having sufficient porosity, the crystalline thermoplastic resin 10
10-1,000 parts by mass is preferable, 0-900 parts by mass is more preferable, and 100-90 parts is 0-mass part.
0 part by mass is particularly preferred. The mixing ratio of solid particles is
1 to 200 relative to 100 parts by mass of the crystalline thermoplastic resin
A mass part is preferable, a 10-150 mass part is further more preferable, and a 30-90 mass part is especially preferable. Also, other,
Color materials such as organic dyes, surfactants, silicone compounds, antioxidants and the like may be mixed.

The low molecular weight compound used in the present invention is preferably a compound having a molecular weight of 50 to 1,000, more preferably 100 to 500. This is because the low molecular weight compound has a melting point lower than the softening temperature (or melting point) of the crystalline thermoplastic resin, and the softening temperature (or melting point) of the crystalline thermoplastic resin and the melting point of the low molecular weight compound are The difference is preferably 10 ° C. or higher, more preferably 20 ° C. or higher, and particularly preferably 30 ° C. or higher, from the viewpoint of easy production.
It is preferably 100 ° C or lower. The low molecular weight compound is preferably hydrophobic because it has good compatibility with the crystalline thermoplastic resin. Hydrophobicity refers to the ratio of inorganic (I) to organic (O) in the organic conceptual diagram-basic and applied- (Yoshio Koda, Sankyo Publishing Co., Ltd., issued May 10, 1984).
/ O] is preferably 1.00 or less, more preferably 0.50 or less.

Examples of the low molecular weight compound used in the present invention include branched or linear higher alcohols such as lauryl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, lanolin alcohol, hydrogenated lanolin alcohol, isostearyl alcohol and cholesterol. Branched or linear higher fatty acids such as myristic acid, palmitic acid, stearic acid, arachidonic acid;
Branched or linear alkyl ethers such as distearyl ether; hydrocarbon compounds such as paraffin, petrolatum, microcrystalline wax; natural such as squalane, squalene, mink oil, jojoba oil, carnauba wax, beeswax, candelilla wax, lanolin Compounds; ester compounds such as myristyl myristate, myristyl stearate, isopropyl myristate, isopropyl myristate, myristin myristate, octyldodecyl myristate, glyceryl trimyristate, cholesteryl isostearate; octylmethylcyclotetrasiloxane, dodecamethylcyclohexa Cyclic silicones such as siloxanes, chain silicones such as dimethylpolysiloxane and methylphenylpolysiloxane, amino-modified silicones, polyacyl Le-modified silicone, methylphenyl polysiloxane, fatty acid-modified silicones, alcohol-modified silicones, alkoxy-modified silicones, epoxy-modified silicones, fluorine-modified silicones, cyclic silicones, silicone and its derivatives such as alkyl-modified silicone.

Next, this mixture is sprayed into a gas phase of preferably 5 to 50 ° C. by using a rotary disk atomizer, a multi-fluid nozzle of one fluid, or two or more fluids, and the solidified particles are recovered by cooling. To do. Preferably, a multi-fluid nozzle with two or more fluids is used and sprayed into the gas phase with a compressed gas. The compressed gas used as fluid is preferably 9.
8 × 10 ⁴ Pa or more, more preferably 9.8 × 10 ⁴ to 2
Compressed air or compressed nitrogen of 9.4 × 10 ⁴ Pa can be used. Using this gas heated to the spray temperature prevents clogging due to cooling at the nozzle,
This is preferable because particles can be continuously produced.

The spraying temperature is preferably 600 mPa · s or less, more preferably 300 mPa · s or less, and particularly preferably 100 mPas, from the viewpoint of obtaining a good spraying property.・ S
The temperature may be the following. There is no particular lower limit, but 5m
Pa · s or more is preferable.

Next, the low molecular weight compound is removed from the obtained particles. The low molecular weight compound is removed at a temperature lower than the softening temperature (or melting point) of the crystalline thermoplastic resin, preferably at a temperature of 20 ° C. or higher, more preferably at least the melting point of the low molecular weight compound in terms of removal efficiency. It is preferable to remove with a solvent at the temperature of. It may be removed by reducing the pressure.

A solvent is preferably added in an amount of 1 to 100 parts by mass to 1 part by mass of the obtained particles and mixed at a temperature lower than the softening temperature (or melting point) of the crystalline thermoplastic resin to elute the low molecular weight compound. Let By repeating such washing, porous particles can be obtained.

The solvent is not particularly limited as long as it dissolves the low molecular weight compound and does not dissolve the crystalline thermoplastic resin. For example, lower alcohols such as ethanol and isopropanol; lower ketone compounds; aliphatic hydrocarbons such as hexane, heptane, dodecane, cyclohexane, methylcyclohexane, isooctane, hydrogenated triisobutylene, etc., aromatic carbonization such as benzene, toluene, xylene, ethylbenzene, etc. Hydrocarbon-based solvents such as hydrogen; silicone-based solvents such as octamethylcyclotetrasiloxane and decamethylcyclopentasiloxane are exemplified.

The porous particles of the present invention preferably contain an oil agent. Since the oil agent sufficiently functions as a substance released from the porous particles, the oil agent has a melting point of 25 ° C or lower at room temperature (2
Preference is given to substances which are liquid at 5 ° C. The melting point of the oil is J
It is a value measured according to IS K0064: 1992.

The oil agent is a humectant having an emollient or structural water-retaining effect on the skin, a protective agent acting as a protective film on the skin and hair, an antioxidant, an agent having an action of strengthening and repairing cuticles, a cooling sensation agent, Antiperspirants and blood circulation promoters are preferred.

Examples of such compounds include those mentioned above as the low molecular weight compounds, but the low molecular weight compounds are not limited thereto. Among these, natural compounds such as squalane and squalene; silicones such as cyclic silicones and derivatives thereof are particularly mentioned. In addition, vitamins such as vitamin A, vitamin E, panthenol, pantothenyl ethyl ether; ceramide and its similar structural substances (eg,
The substances described in JP-A-5-213731 as general formulas (1) and (2)) are preferable. The oil agent may be a mixture of these.

The oil agent is used in the process of producing the porous particles.
The low molecular weight compound can be directly used as an oil agent without being removed from the crystalline thermoplastic resin. Further, after the porous particles are produced, the oil agent may be contained in the porous particles by absorbing oil.

[Cosmetic] The content of the porous particles according to the present invention in the cosmetic of the present invention can be appropriately selected according to the purpose of the cosmetic and is not particularly limited. 0.1 to 50% by mass, particularly 1 to 30% by mass is preferable.

The form of the cosmetic of the present invention is not particularly limited,
Any of water-in-oil type or oil-in-water type emulsion cosmetics, oily cosmetics, spray cosmetics, stick cosmetics, water-based cosmetics, sheet cosmetics, gel cosmetics and the like may be used. The type of cosmetics of the present invention is not particularly limited, and examples thereof include packs, foundations, lipsticks, lotions, cold creams, hand creams, skin cleansers, softening cosmetics, nutritional cosmetics, astringent cosmetics, whitening cosmetics, Skin cosmetics such as wrinkle-improving cosmetics, anti-aging cosmetics, cleaning cosmetics, antiperspirants, deodorants and the like; hair cosmetics such as shampoos, rinses, treatments, hair styling agents and hair nourishing agents.

The cosmetic of the present invention preferably contains alcohol. Examples of the alcohol include monohydric or polyhydric alcohols having 1 to 6 carbon atoms such as ethanol, glycerin, 1,3-butylene glycol, propylene glycol, and sorbitol, and among them, monohydric alcohol, particularly ethanol is preferable. The content of alcohol is preferably 5 to 30% by mass in the cosmetic of the present invention, and particularly preferably 1 to 50 times by mass that of the porous particles according to the present invention.

In the cosmetic of the present invention, other components generally used as cosmetic ingredients are appropriately blended depending on the form, type, etc. of the above-mentioned cosmetics within a range that does not impair the effects of the present invention. be able to.

Examples of such cosmetic ingredients include extenders such as mica, talc, sericite, kaolin, nylon powder, polymethylsilsesquioxane, and barium sulfate; solid pigments such as titanium oxide, zinc oxide, and iron oxide;
These powders are surface-hydrophobicized by silicone treatment, metal soap treatment, N-acylglutamic acid treatment, etc .; solid or liquid paraffin, microcrystalline wax, petrolatum, ceresin, ozokerite, montan wax, and other hydrocarbons. ; Olives, earth wax, carnauba wax,
Vegetable oils such as lanolin and whale wax, animal oils or waxes; stearic acid, palmitic acid, oleic acid, glycerin monostearate ester, glycerin distearate ester, glycerin monooleate ester, isopropyl myristate ester, isopropyl stearic acid ester Fatty acids such as esters and butyl stearates, or esters thereof; higher alcohols such as cetyl alcohol, stearyl alcohol, palmityl alcohol, hexyldecyl alcohol; adsorption or enhancement of cationized cellulose, carboxybetaine-type polymers, cationized silicone, etc. Adhesives; Polyhydric alcohols such as glycol and sorbitol, which have moisturizing action; Polyether-modified silicone, polyether / alkyl-modified silicone, glyceryl ether Emulsifiers for silicone oils such as modified silicones; methylcellulose, ethylcellulose,
Thickeners such as carboxymethyl cellulose, polyacrylic acid, tragacanth, agar, gelatin; aluminum hydroxy chloride, aluminum chloride, aluminum sulfate,
Antiperspirants such as basic aluminum bromide, aluminum phenol sulfonic acid, basic aluminum iodide;
Disinfectants such as 4,4-trichlorocarbanilide (TCC), benzalkonium chloride, benzethonium chloride, alkyltrimethylammonium chloride, resorcin, phenol, sorbic acid, salicylic acid, and hexachlorophene;
Masking agents such as jascent, skatole, lemon oil, lavender oil, absolute, jasmine, vanillin, benzoin, benzyl acetate, menthol, and others, emulsion stabilizers, chelating agents, UV protection agents,
pH adjusting agents, antiseptics, pigments, whitening agents, analgesic and anti-inflammatory agents, antipruritic agents, bactericidal and disinfecting agents, astringents, emollients, hormonal agents and other medicinal components; water; surfactants; W / O or O / Examples thereof include W-type emulsifiers and fragrances.

[0045]

EXAMPLES In the following examples, the viscosity at the spray temperature is B
It is a value measured with a mold viscometer at 60 rpm for 1 minute (a rotor having a measurement scale of 5 to 95 is used). The melting point is a value measured according to JIS K0064: 1992. For measuring the pore surface area, a mercury porosimeter PORE SIZER 932 manufactured by Shimadzu Corporation is used.
0 was used. When calculating the total pore surface area, the surface tension of mercury σ = 484 dyne / cm and the contact angle θ = 130.
Use °.

Example 1 Polyethylene wax (Mitsui High Wax HW-200P, manufactured by Mitsui Chemicals, Inc.) as a crystalline thermoplastic resin,
Molecular weight 2,000, melting point 122 ° C, crystallinity index 0.82
(Measured density = 0.97, dc = 1.000, da = 0.
855 (g / cm ³ ))), zinc oxide (FAINEX75)
(Particle size 0.03 μm, manufactured by Sakai Chemical Industry Co., Ltd.), stearyl alcohol as a low molecular compound (melting point 60 ° C., I / O =
0.28) is mixed at a mass mixing ratio of 70: 30: 100, sufficiently crushed in a mortar, filtered through a 400-mesh wire net, and dissolved by heating at 180 ° C. Next, 180 with a two-fluid nozzle (glass sprayer M type, SANSYO)
The mixture was spray-cooled in a gas phase at 25 ° C. with a nitrogen stream at 0 ° C., and collected as solid particles. The viscosity at the time of spraying was 50 mPa · s. Then 5 g in 100 ml of 60 ° C ethanol
The collected particles were mixed and stirred for 2 minutes to extract stearyl alcohol, and the mixture was filtered under reduced pressure with a PTFE 0.8 μm membrane filter to obtain zinc oxide-containing porous particles (weight average particle diameter 30 μm, pore surface area 45 m ² / g)
Got When the zinc oxide content was determined by measuring the ignition residue after heating at 800 ° C. for 2 hours, it was 20% by mass.

Example 2 In Example 1, the mass mixing ratio of polyethylene wax, zinc oxide and stearyl alcohol was 70: 30: 2.
A zinc oxide-containing porous particle (weight average particle diameter 20 μm, pore surface area 55 m)
² / g) was obtained. The viscosity at the time of spraying was 30 mPa · s. When the content of zinc oxide was determined by measuring the ignition residue after heating at 800 ° C. for 2 hours, it was 15% by mass.

Example 3 In Example 2, liquid paraffin (manufactured by Sigma-Aldrich Japan KK, I / O = 0) was used as the low-molecular compound instead of stearyl alcohol, and normal hexane was used instead of ethanol. Other than the above, the zinc oxide-containing porous particles (weight average particle diameter 3
0 μm, pore surface area 54 m ² / g) was obtained. The viscosity at the time of spraying was 30 mPa · s. When the content of zinc oxide was determined by measuring the ignition residue after heating at 800 ° C. for 2 hours, it was 15% by mass.

Example 4 In Example 3, the removal treatment of liquid paraffin was omitted and liquid paraffin-supported zinc oxide-containing porous particles (weight average particle diameter 30 μm, pore surface area 54 m ² / g) were obtained. When the zinc oxide content was determined by measuring the ignition residue after heating at 800 ° C. for 2 hours, it was 9% by mass.

Comparative Example 1 In Example 1, polyethylene oxide and stearyl alcohol were mixed in a mass ratio of 50:
Porous particles (weight average particle diameter 30 μm, pore surface area 48 m ² / g) were treated in the same manner except that the amount was 50.
Got The ignition residue after heating at 800 ° C. for 2 hours was 0 mass%.

Comparative Example 2 In Example 1, instead of polyethylene wax, polyethylene having a molecular weight of 500 (Toyo Petrolite (manufactured by Toyo Petrolite),
Using a melting point of 75 ° C. and a crystallinity index of 0.82, behenic acid (molecular weight 340.5) instead of stearyl alcohol was used.
No. 6, melting point 80 ° C., I / O = 0.38) were used, and solid particles (weight average particle size 1
5 μm) was obtained. The viscosity at the time of spraying was 20 mPa · s. When the content of zinc oxide was determined by measuring the ignition residue after heating at 800 ° C. for 2 hours, it was 10% by mass.

Test Example 1 The zinc oxide-containing porous particles obtained in the above Examples 1 to 3 and Comparative Examples 1 and 2 were weighed in an amount of 0.1 g in terms of zinc oxide mass, and the butyric acid and squalene mass ratio was 0.2: 0.5 g of the liquid mixed at 99.8 was mixed, and N of 330 ml / min was mixed.
_The concentration of butyric acid in the gas collected by contacting with _two air streams was measured with a gas detector tube, and this was defined as the acid trapping ability of the present particles. The blank was 10 ppm. The results are shown in Table 1.

[0053]

[Table 1]

Test Example 2 The spreadability of the particles obtained in Examples 1 to 4 and Comparative Examples 1 to 2 was evaluated by the following method, and the feel as a cosmetic was evaluated by a professional panelist (1 person). The results are shown in Table 2.
Shown in.

<Evaluation method of spreadability> Professional panelist (1 person)
A plurality of particles were sandwiched between the fingers and the fingers were rubbed against each other to determine the diffusion state of the particles between the fingers according to the following criteria. ○: Spread uniformly. Δ: spreads unevenly. X: Particles are crushed and do not spread.

[0056]

[Table 2]

As is clear from Table 2, the porous particles of the present invention are excellent in spreadability and feel.

Formulation Example 1 (deodorant powder) The following components a) to c) are mixed with a Henschel mixer, components d) to f) are added to this mixture, and the mixture is crushed with a crusher to remove odor. I got powder. * Dimethicone 20cs: K manufactured by Shin-Etsu Silicone Co., Ltd.
F96-20cs * Dimethicone 6cs: Shin-Etsu Silicone KF
96-6cs.

[0059]

Industrial Applicability The porous particles of the present invention can be manufactured at a low cost and, when containing a metal oxide, have a deodorizing ability,
In addition, it can give a smooth feel to the skin. Further, the porous particles containing the liquid oil agent can give a moist feeling to the skin as a sustained-release agent for the oil agent.
Zinc oxide is unstable to acidic thickeners such as commonly used Carbopol (registered trademark, manufactured by BF-Goodrich), but when it is present in the particles, other cosmetic ingredients are present. It can exist stably even when mixed with.

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Claims (8)

[Claims] 1. Porous particles comprising a crystalline thermoplastic resin, containing solid particles having a particle size of 0.001 to 10 μm. 2. The crystallinity index of the crystalline thermoplastic resin is:
The porous particle according to claim 1, which is 0.5 or more. 3. The porous particle according to claim 1, which has a pore surface area of 10 to 300 m ² / g. 4. The porous particle according to claim 1, wherein the crystalline thermoplastic resin is a polyolefin. 5. The porous particle according to claim 1, wherein the solid particle is at least one metal oxide selected from the group consisting of zinc oxide, titanium oxide and cerium oxide. 6. The porous particle according to claim 1, which contains an oil agent. 7. A cosmetic containing the porous particles according to claim 1. 8. A crystalline thermoplastic resin having a particle size of 0.001 to 0.001.
Solid particles of 10 μm and a low molecular weight compound having a melting point lower than the softening temperature (or melting point) of the resin are mixed at a temperature equal to or higher than the softening temperature (or melting point) of the resin, and then sprayed in a gas phase to obtain A method for producing porous particles, wherein the low-molecular compound is removed from the obtained particles.