JP2000229807A - Disintegrable particle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain disintegrable particles comprising water-insoluble aggregated primary particles, having a specific ratio of bulk specific gravity to true specific gravity and good in feeling of use, massage feeling and disintegrating properties. SOLUTION: These disintegrable particles comprise at least partially water- insoluble aggregated primary particles in 0.1-0.6 (bulk specific gravity)/(true specific gravity) ratio and are capable of disintegrating the aggregation by reducing the concentration of water-soluble salts in an aqueous solution containing the water-soluble salts. The disintegrable particles are preferably obtained by bonding and aggregating the water-insoluble primary particles with a water-soluble binder and the binder preferably contains at least one kind of binder component selected from the group consisting of a carboxylic acid-modified polyvinyl alcohol, a sulfonic acid-modified polyvinyl alcohol and a carboxymethyl cellulose salt. The average particle diameter of the disintegrable particles is preferably 125-800 μm. The water-soluble binder is preferably used in an amount of 0.75-25 wt.% based on the weight of the primary particles.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to disintegrating particles in which particles disintegrate in the course of washing and rinsing, and to a cosmetic composition having extremely good washing and rinsing properties.

[0002]

2. Description of the Related Art A skin cleansing agent containing particles (scrubbing agent) can remove excess keratin (scalp), skin crevices, dirt, etc. which are hard to remove with a normal cleaning composition in physical cleaning. Has features. In addition, there is a highly cleansing and low-irritating cleansing agent in which the size and hardness of the scrubbing agent are controlled in consideration of the problem of skin irritation (Japanese Patent Laid-Open No. Hei 2 (1994)).
-151693). On the other hand, there is also a detergent (JP-A-6-305951) in which sodium chloride particles having a saturation solubility or higher are blended in a detergent composition, and sodium chloride is present as particles to provide a detergency and a smooth skin finish. .

[0003]

However, a cleaning agent containing a scrub agent having a controlled particle size and hardness has problems in use such as a feeling of foreign matter at the time of massaging and a difficulty in washing off after washing. I was

A detergent composition containing sodium chloride particles having a saturation solubility or higher has a problem in dispersibility because the scrubbing agent is liable to agglomerate and settle. In addition, since sodium chloride is contained at a level higher than the saturation solubility, there are problems such as foaming during washing, and deterioration in washability and usability.

[0005]

Means for Solving the Problems The present inventors have found that primary particles at least partially insoluble in water are agglomerated, and the bulk of particles that disintegrate in a water-soluble salt-containing aqueous solution due to a decrease in the concentration of the water-soluble salts is reduced. It has been found that when the ratio between the specific gravity and the true specific gravity is within a certain range, disintegrating particles having good feeling in use, feeling of massage and disintegration can be obtained.

The present invention relates to disintegrable particles in which (bulk specific gravity) / (true specific gravity) is at least partially agglomerated with primary particles which are insoluble in water. The present invention provides disintegrable particles in which aggregation of the disintegrable particles is disintegrated due to a decrease in the concentration of a water-soluble salt in an aqueous solution containing a soluble salt.

Further, the present invention comprises the above-mentioned disintegrable particles, a water-soluble salt, a surfactant and water, wherein the content of the disintegrable particles is 1 to 25% by weight in the composition. Since the concentration is 1.0% by weight or more and less than the saturation solubility, and the disintegrable particles are easily disintegrated by rinsing water, a cosmetic composition having extremely good washability is provided.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The average particle size of the disintegrable particles used in the present invention is preferably from 100 μm to 1000 μm from the viewpoint of discomfort when using cosmetics and skin irritation.
125 μm to 800 μm is more preferred.

The primary particles constituting the disintegrable particles of the present invention may be at least partially at least one kind of water-insoluble primary particles. For example, water-insoluble primary particles or a combination of water-insoluble primary particles and water-soluble primary particles can be used. Preferred embodiments from the viewpoint of disintegration include a combination of two or more, more preferably three or more, water-insoluble primary particles, or a combination of these combinations with water-soluble primary particles. These primary particles may be organic particles or inorganic particles. Here, “water-insoluble” means that when 1 part by weight of a target particle is dissolved in 99 parts by weight of water at 25 ° C., the solubility is 5%.
It is less than 0% by weight, and “water-soluble” means that the solubility under the same conditions is 50% by weight or more. The solubility is calculated by filtering the aqueous solution through filter paper (No. 2) and calculating the solid content in the filtrate. The water-soluble primary particles preferably have a solubility of 90% by weight or more.

The water-insoluble organic primary particles include polyethylene, polypropylene, polyamide, polyethylene terephthalate, polystyrene and polyurethane and / or cross-linked products thereof, sodium poly (meth) acrylate and poly (meth) acrylate, and / or Ethylene rubber, propylene rubber, styrene-
Synthetic polymers such as butadiene rubber, butadiene rubber, silicone rubber and the like and / or cross-linked products thereof; natural polymers such as cellulose and / or derivatives thereof, chitosan and / or derivatives thereof, starch, fruit shells and the like; And / or derivatives thereof. Among them, polyethylene, polyamide, polystyrene, cross-linked poly (meth) acrylate, cross-linked poly (meth) acrylate,
Cellulose and / or its derivatives, starch and the like are preferably used. Here, “poly (meth) acrylic acid” means both “polyacrylic acid” and “polymethacrylic acid”.

The water-insoluble inorganic primary particles include, for example, bentonite, talc, mica, kaolin, sepiolite, silica, calcium carbonate, titanium oxide, silicic anhydride, hydroxy calcium apatite, and pearls. Among them, bentonite, talc, mica, kaolin, silica and the like are preferably used.

These water-insoluble primary particles may have a true spherical shape, a substantially spherical shape, a flat plate shape, a rod shape, or an irregular shape due to pulverization or the like, and hollow or porous particles may also be used.

As the water-soluble organic primary particles, polyvinyl alcohol and / or a derivative thereof, alkali salt of poly (meth) acrylate, alkali salt of (meth) acrylic acid / (meth) acrylate copolymer, acrylic acid / maleic Synthetic polymers such as alkali salts of acid copolymers and polyvinylpyrrolidone; methylcellulose, ethylcellulose, sodium carboxymethylcellulose, hydroxyalkylcellulose, modified starch (hydroxyalkyl-modified starch, phosphate-modified starch, etc.), sucrose, lactose, etc. Saccharides: Natural polymers such as seaweeds and proteins are used.

The water-soluble inorganic primary particles include chlorides such as sodium chloride, potassium chloride and magnesium chloride; sulfates such as sodium sulfate, potassium sulfate, magnesium sulfate and aluminum sulfate; and carbonates such as sodium carbonate and sodium hydrogen carbonate. Salts. In the case of sodium chloride, salt, high-purity purified salt, natural salt and the like are used. Among them, inorganic particles such as sodium chloride, potassium chloride, magnesium chloride and sodium carbonate are preferred.

The shape of these water-soluble primary particles is not limited either, and they may be used alone or in combination of two or more.

The weight ratio of the water-insoluble primary particles to the water-soluble primary particles in the disintegratable particles of the present invention is preferably (water-insoluble primary particles) / (water-soluble primary particles) = 1/99 to 100/0, 50/50 to 100/0 is more preferred.

The average particle size of these primary particles is preferably 70 μm or less from the viewpoint of the washing process of the object to be cleaned and the discomfort of the primary particles when disintegrated by rinsing water and the washability.

The disintegrable particles of the present invention are preferably those in which the above-mentioned primary particles are bound and aggregated by a water-soluble binder. The binder component of such a water-soluble binder is not particularly limited as long as it dissolves in a water-soluble salt aqueous solution by decreasing the salt concentration and precipitates by increasing the salt concentration, but polyvinyl alcohol and / or a derivative thereof (For example, carboxylic acid-modified polyvinyl alcohol, sulfonic acid-modified polyvinyl alcohol, etc.),
Poly (meth) acrylic acid alkali salt, (meth) acrylic acid / (meth) acrylic acid ester copolymer alkali salt, acrylic acid / maleic acid copolymer alkali salt, synthetic products such as polyvinylpyrrolidone; methylcellulose, ethylcellulose And semi-synthetic polymers such as carboxymethylcellulose salts (eg, sodium salts and potassium salts), hydroxyalkylcellulose, and starch derivatives; and natural polymers such as starch, seaweeds, plant mucilage, and proteins. Among them, carboxylic acid-modified polyvinyl alcohol (for example, itaconic acid-modified or maleic acid-modified polyvinyl alcohol), sulfonic acid-modified polyvinyl alcohol, or carboxymethyl cellulose salt (for example, having a degree of etherification of 0.2 to 1.2) is preferable. . These binder components may be used alone or in combination of two or more.

In the disintegrable particles of the present invention, the water-soluble primary particles and the water-soluble binder may use the same type of material or different materials.

The water-soluble binder is preferably used in an amount of 0.5 to 30% by weight, more preferably 0.75 to 25% by weight, based on the weight of the primary particles. In this case, the amount of the water-soluble binder used is preferable from the viewpoint of the disintegration of the particles and the workability during the production of the disintegrable particles or the cosmetic composition containing the same.

The disintegrable particles of the present invention have a (bulk specific gravity) /
(True specific gravity) is 0.1 to 0.6, preferably 0.2 to 0.1.
The range is 6. If (bulk specific gravity) / (true specific gravity) is larger than 0.6, it is not preferable because the porosity of the particles is reduced and the particles have a low disintegration rate. Also (bulk specific gravity) /
When (true specific gravity) is less than 0.1, the strength of the particles is small,
For example, when the dry particles are transported, stored as a cosmetic composition, transported, or compounded, the particles are disintegrated and are not suitable for practical use, which is not preferable.

The method for producing the disintegrable particles of the present invention is not particularly limited, but, for example, tumbling granulation, tumbling fluidized granulation, fluidized bed granulation while mixing and / or mixing the primary particles and a water-soluble binder. It is preferably produced by a granulation method such as granulation, stirring tumbling granulation, melt granulation, extrusion granulation method, spray drying granulation and / or a coating method such as spray drying.

The disintegrable particles of the present invention thus obtained are as follows:
As described above, in the aqueous solution containing a water-soluble salt, the disintegration rate is increased by decreasing the concentration of the water-soluble salt or by applying a load to the collapsible particles together with the concentration of the water-soluble salt. Therefore, when the disintegrating particles are blended into a cosmetic composition, the disintegrating particles are stably dispersed without disintegration in the cosmetic composition,
The disintegrable particles disintegrate as the concentration of the water-soluble salts decreases during the washing process and the rinsing process. Taking into account the incorporation into such a cosmetic composition, the disintegration properties of the disintegrable particles of the present invention can be determined in an aqueous solution having a water-soluble salt concentration of less than 1.0% by weight, more preferably less than 1.5% by weight. It is preferable to design so that at least a part thereof disintegrates. From the viewpoint of rinsing water, further washing in an aqueous solution having a water-soluble salt concentration of less than 1.0% by weight, more preferably less than 1.5% by weight. 70% by weight based on the collapsible particles before (ie, before collapsing)
More preferably, the above is designed to collapse. Further, it is preferable that the collapsed particles at this time have an average particle diameter of 74 μm or less.

The cosmetic composition of the present invention contains the above-mentioned disintegrable particles, a water-soluble salt, a surfactant and water, and the content of the disintegrable particles is determined from the viewpoint of feel and physical (mechanical) detergency. It is 1 to 25% by weight, preferably 2 to 20% by weight in the composition.

The water-soluble salts used in the cosmetic composition of the present invention include water-soluble inorganic salts and water-soluble organic salts, with water-soluble inorganic salts being preferred.

Examples of the water-soluble inorganic salt include chlorides such as sodium chloride, potassium chloride and magnesium chloride; sulfates such as sodium sulfate, potassium sulfate, magnesium sulfate and aluminum sulfate; carbonates such as sodium carbonate and sodium hydrogen carbonate. Is mentioned. In the case of sodium chloride, salt, high-purity purified salt, natural salt and the like are used.
Among them, sodium chloride, potassium chloride, magnesium chloride, sodium sulfate and sodium carbonate are particularly preferably used.

Examples of the water-soluble organic salt include citrate, succinate, maleate, fumarate, malate, etc., fatty acid soaps, ester phosphates, acylated amino acid salts, sulfosuccinates, and the like. Anionic surfactants such as taurate-based surfactants and amphoteric surfactants such as betaine stearyldimethylaminoacetate, trimethylglycine and laurylhydroxysulfobetaine are used. These water-soluble inorganic salts and water-soluble organic salts can be used in combination. In such a case, the weight ratio (water-soluble inorganic salt)
// (water-soluble organic salt) = 100/0 to 5/95 is preferable in view of improvement in detergency, and 90/10 to 10/90 is more preferable.

The content of these water-soluble salts is less than the saturation solubility in water in the cosmetic composition, but the stability of the disintegratable particles in the composition, the disintegration by rinsing, and the From the viewpoint of foaming properties, the solubility is preferably 1.0% by weight or more and less than the saturated solubility, more preferably 1.5% by weight or more and less than the saturated solubility, and particularly preferably 2% by weight or more and 0.8 times the saturated solubility or less.

The surfactant (except for those used as the above water-soluble organic salts) used in the cosmetic composition of the present invention is not particularly limited. Examples thereof include fatty acid soaps, phosphates, acylated amino acids, and sulfosuccinic acids. , Anionic surfactants such as taurate surfactants and polyoxyethylene alkyl sulfates; and nonionic surfactants such as alkyl saccharides and EO addition surfactants. Among them, phosphoric esters, acylated amino acids, alkyl saccharides and the like are preferred because they cause less skin irritation.

The surfactant and the water-soluble organic salt used in the cosmetic of the present invention partially overlap, but an ionic surfactant which functions as a salt should be used as a water-soluble salt. Can be. The amount of the surfactant is not particularly limited, but is 60 to 90% by weight when the detergent is a solid, 40 to 70% by weight when a detergent is used, 40 to 70% by weight when a detergent is used, and when the detergent is a liquid. It is preferable to mix 10 to 50% by weight. Further, it is also preferable to use an amine oxide, an imidazoline-based surfactant, or a betaine-based surfactant as a foaming property improver.

In addition to the above components, components commonly used in cosmetics,
For example, oils, thickeners, wetting agents, coloring agents, preservatives, feel improvers, fragrances, anti-inflammatory agents, bactericides, ultraviolet absorbers, humectants, etc. may be used as long as the effects of the present invention are not impaired. it can.

The disintegrating particles of the present invention include, in addition to facial cleansers, whole body cleansing agents, skin cleansing agents such as solid soaps, shampoos, scalp cleansing agents, dishwashing agents, contact lens cleaning agents, toothpastes, hair growth agents and the like. It can be widely used for massage agents.

[0033]

EXAMPLES The parts described below refer to parts by weight.

Production Example 1 of Disintegrable Particles 200 g of W-400G as primary particles was placed in an LFS-GS-2J type high-speed mixer (manufactured by Fukae Kogyo KK).
After premixing, 133 g of T-330 having an effective component of 15% was gradually added as a binder while rotating to granulate. The granulated product was dried at 70 ° C. for 24 hours, and sieved to obtain 34 g of disintegrable particles (1) having an average particle size of 300 μm.

Preparation Examples 2-4 of Disintegrable Particles The types and amounts of primary particles and the types and amounts of binders are shown in Table 1.
The disintegrable particles (2) to (4) were produced in the same manner as in Production Example 1 except that the particles were changed as shown in (1). The ratios in the tables represent parts by weight of the effective components.

Production Example 5 of Disintegrable Particles 5 SPRAY DRYER SD-1 (manufactured by EYELA)
In addition, 150 g of W-400G and PE-
Using 50 g of 1080, 6% HPC as a binder
330 g and 400 g of 5% KL-506 were added and spray dried. The obtained particles are further dried at 70 ° C. for 24 hours, and are then sieved with a sieve.
g was obtained.

Test Example The average particle size of the disintegrable particles obtained in Production Example and the disintegration rate in a salt solution were measured. Table 1 shows the obtained results.

(1) Method for Measuring Average Particle Size The average particle size was measured by a laser diffraction / scattering type particle size distribution analyzer LA-910 (manufactured by Horiba, Ltd.). The median diameter was used as the average particle diameter.

(2) Method for measuring the disintegration rate of disintegrable particles (0.9% saline disintegration rate A (%), 10% saline disintegration rate B (%)) 0.9% saline solution in 29.7 g 0.3 g of each disintegrable particle was added and stored in a thermostat at 35 ° C. for 15 hours. Next, 6 g of this sample was weighed on artificial leather, covered with another artificial leather, and reciprocated 5 times back and forth under a load of 5 g / cm ² , and then 200 mesh (sieve diameter 74 μm).
And the dry weight of the residue is measured. At this time, the ratio by which the disintegrable particles passed through a 200-mesh sieve was expressed as a percentage by weight, and was defined as a 0.9% saline solution disintegration rate A (%).
The same operation was performed using a 10% saline solution to obtain a 10% saline solution disintegration rate B (%).

(3) Method of Measuring Bulk Specific Gravity of Disintegrable Particles An “apparent density measuring device” described in JIS K3362 is placed horizontally, and about 120 mL of disintegrable particles are allowed to fall naturally from a funnel into a weighed cup. Scrape the raised sample from the cup and weigh the cup. The bulk specific gravity is [weight of sample in cup (g)] / [capacity of cup (mL)].

(4) Method of Measuring True Specific Gravity of Disintegrable Particles After about 1.3 g of disintegrable particles were placed in a sample cup and precisely weighed, a multi-volume densitometer 1305 (MICROME) was used.
RITICS INSTRUMENT) using helium gas. The number of measurements was three for each, and the average value was adopted.

[0042]

[Table 1]

* 1: Compounding ratio in primary particles * 2: [(binder weight) / (primary particle weight)] × 1
00 T-330: maleic acid-modified polyvinyl alcohol, manufactured by Nippon Synthetic Chemical Industry Co., Ltd. Sodium chloride: special grade salt, manufactured by Naikai Salt Industry Co., Ltd. KL-506: itaconic acid-modified polyvinyl alcohol,
Kaolin manufactured by Kuraray Co., Ltd .: L-3600 manufactured by Wako Pure Chemical Industries, Ltd. L-3600: sodium carboxymethyl cellulose (degree of etherification: 0.44), corn starch manufactured by Nippon Paper Co., Ltd .: Corn starch, Japanese Pharmacopoeia, Matsutani Chemical Industry Co., Ltd. MK-100: Synthetic mica, manufactured by Corp Chemical K-15: Polyvinylpyrrolidone, Wako Pure Chemical Industries, Ltd.
SPC-20A: Maleic acid-modified polyvinyl alcohol, Shin-Etsu Chemical Co., Ltd. HPC: Hydroxypropylcellulose, Wako Pure Chemical Industries, Ltd. KN-111: Polyvinyl alcohol, Kuraray Co., Ltd.

As can be seen from Table 1, the disintegrable particles of the present invention have a lower disintegration rate of the disintegrable particles in a water-soluble salt-containing aqueous solution as compared with a case where the concentration of the water-soluble salt is high. Is found to rise.

Examples 1 to 6 and Comparative Examples 1 to 3 Disintegrable particles 1 to 5 and powdery silica (average particle size 210 μm)
m), CL-5007 (average particle size: 360 μm, polyethylene beads, manufactured by Sumitomo Seika Co., Ltd.) or disintegrable particles 6 were blended to prepare a cosmetic composition having the composition shown in Table 2. Using these cosmetic compositions, Examples 1 to 5 and Comparative Examples 1 to 3 were evaluated for disintegration rate C, cleaning rate, foaming property, massage feeling, and washability by the following measurement methods. Table 3 shows the results.

(A) Method for Measuring Disintegration Rate of Disintegrable Particles in Cosmetic Composition (Disintegration Rate C (%)) 2 g of the cosmetic composition and 4 g of tap water are measured on artificial leather, and one more sheet is taken. And then reciprocated 5 times back and forth under a load of 5 g / cm ² , then 200 mesh (particle size 74
(μm), and the dry weight of the residue is measured. The decay rate conforms to the above-mentioned measuring method (2). (B) Washing rate (%) 1-[(p-phenylazo) -phenyl] on artificial leather
Solid fat dyed with azo [2-naphthol] is 15m in diameter
m, applied to a thickness of 0.1 mm, and washed with cosmetics of Examples and Comparative Examples containing collapsible particles or other particles, or cosmetics containing purified water instead of collapsible particles or other particles The remaining solid fat was dissolved in an organic solvent, the absorbance was measured, and the measured value was compared with the measured absorbance of the solid fat of the unwashed product to determine the washing rate. These were put into the following equation to determine the cleaning rate.

[0047]

(Equation 1)

Where W = detergency W ₁ = absorbance of cosmetics containing disintegrating particles or other particles W _O = absorbance of cosmetics containing purified water

(C) Foaming property 20 g of the cosmetic composition and 20 g of tap water are placed in a 120 mL glass container (40 mm in diameter), shaken 20 times, and left to stand.
From the height (mm) of the foam after 0 seconds and 5 minutes, the foamability was checked.

(D) Massage Feeling Ten female professional panelists performed face-washing, and the sensory evaluation of the massage feeling was performed and judged according to the following criteria.

◎: 8 to 10 persons evaluated good. ：: 6 to 7 persons evaluated it as good. B: Five or less evaluated as good. X: Even one person was evaluated as feeling discomfort and irritation.

(E) Rinse-out properties Ten female professional panelists performed face-washing, and the sensory evaluation of the wash-off property was performed based on the presence of particles during face-washing and rinsing, and the following criteria were used.

◎: 8 to 10 persons evaluated good. ：: 6 to 7 persons evaluated it as good. B: Five or less evaluated as good. X: Even one person was evaluated that the particles remained.

[0054]

[Table 2]

[0055]

[Table 3]

As can be seen from Table 3, the disintegrable particles in the cosmetic composition of the present invention are particles having no disintegration and disintegration in which (bulk specific gravity) / (true specific gravity) is out of the range of the present invention. It is apparent that the particles disintegrate in the washing step and the rinsing step, and are superior in washability, as compared with the conductive particles. Further, when the cosmetic composition of the present invention was used, the washing rate was high and the massage feeling was good. Furthermore, since the concentration of the water-soluble salts in the cosmetic composition of the present invention is less than the concentration of the saturated salt, extremely high foaming properties are maintained, and the washing properties and the feeling upon use are excellent. The disintegrable particles in the cosmetic composition of the present invention were all favorable in the blending stability of the cosmetic composition in a storage test at 50 ° C.

[0057]

Industrial Applicability The cosmetic composition of the present invention is particularly excellent in physical (mechanical) detergency, excellent in stability over time, and has a good feeling in use. Furthermore, in the washing step and the rinsing step, the disintegrating particles are easily disintegrated, so that the washability is extremely good.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshihiro Hasebe 1334 Minato, Wakayama-shi, Wakayama Prefecture F-term in the Kao Research Laboratory 4C076 AA32 BB31 DD27A DD28A DD29A DD30A EE02A EE04A EE06B EE09A EE10A EE11A EE12AEEB EE38A EE45A EE57A FF06 4C083 AA011 AB031 AB051 AB332 AB432 AB442 AC122 AC242 AC482 AC542 AC562 AC902 AD022 AD072 AD111 AD112 AD242 AD271 AD272 AD282 BB01 BB26 BB36 CC22 CC23 EE01 EE06 EE07 FF01

Claims (5)

[Claims] 1. Primary particles at least partially insoluble in water are agglomerated, and (bulk specific gravity) / (true specific gravity) is 0.1 to 0.1.
A disintegrable particle having a particle size of 0.6, wherein aggregation of the disintegrable particle is disintegrated due to a decrease in the concentration of the water-soluble salt in the aqueous solution containing a water-soluble salt. 2. Disintegrating particles formed by aggregation of water-insoluble primary particles bound by a water-soluble binder, wherein the binder comprises a carboxylic acid-modified polyvinyl alcohol, a sulfonic acid-modified polyvinyl alcohol, and a carboxymethyl cellulose salt. The disintegrable particle according to claim 1, comprising at least one binder component selected from the group. 3. The disintegrable particles according to claim 1, wherein the disintegrable particles contain two or more types of water-insoluble primary particles. 4. The disintegrable particles according to claim 1, a water-soluble salt, a surfactant and water, wherein the content of the disintegrable particles is 1 to 25% by weight in the composition. A cosmetic composition wherein the concentration of the water-soluble salts is 1.0% by weight or more and less than the saturation solubility. 5. The disintegrable particles are at least partially disintegrated in a washing step and a rinsing step of the object to be washed, and the disintegration rate at which the disintegrable particles become particles of 74 μm or less is determined by the disintegration rate before washing. The cosmetic composition according to claim 4, wherein the amount is 70% by weight or more based on the particles.