JP2992135B2 - Cosmetic composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cosmetic composition. More particularly, it relates to cosmetic creamy and emulsion compositions.

[0002]

2. Description of the Related Art Cosmetic creams and emulsions contain oil as an essential component, and are variously manufactured from anhydrous oily creams to water-containing ones mixed or emulsified with water. The base of which is adjusted. Utilizing the viscosity of the creamy or milky liquid, it is spread thinly on the skin to exert various beautiful skin effects.

[0003] Cosmetics having such a viscosity are referred to as creams or emulsions. In order to obtain this viscosity, glycerin, propylene glycol, higher fatty acids, higher alcohols and the like, which are compatible with water, and furthermore, Is based on emulsification of beeswax, lanolin, vegetable oil, fatty acids, higher alcohols, hydrocarbons, squalane, etc., which are incompatible with water, by emulsifying with water.

[0004] That is, it is premised that oil is heavily used in some form. In this way, oil and moisture are replenished to the skin to prevent cracks and dryness, and in some cases, a beautiful skin effect is expected by the medicinal effect of the medicinal component appropriately added. However, in the conventional technique, a large amount of oil is used to give a viscosity to make it creamy or milky, so that it does not give a refreshing feeling of use and causes stickiness.
Further, for a person with greasy skin, a large amount of oil contained induces acne and pimples, so that the use of such oil-rich and viscous cosmetics was inappropriate.

In order to overcome such obstacles, it is possible to thicken even a simple water-soluble polymer such as methylcellulose, ethylcellulose, carboxymercellulose salt or polyvinyl alcohol, but the aqueous solution is transparent and paste-like. The use feeling is very sticky and is not a property that can be called cream or emulsion. On the other hand, water-swellable clay minerals such as Vegum (trade name of Vanderbilt), Laponite (trade name of Laporte), Smecton (trade name of Kunimine Industries), tetrafluorosilicic mica (trade name of Topy Industries) When thickened with a layered silicate mineral belonging to the genus Smectite, which is commercially available as (name), etc., when swollen in water, the particle size is large and roughness occurs, and therefore, smoothness such as O / W and W / O emulsions There is no noticeable growth or shine, and some of them are colored, which is inconvenient as a cosmetic.

[0006] As described above, there has been a demand for the appearance of a cosmetic cream or emulsion base capable of reducing the oil content even slightly without impairing the conventional physical properties.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a creamy or milky cosmetic composition which can arbitrarily reduce the oil content.

[0008]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, it has become possible to reduce the oil content and to obtain a creamy or emulsion composition for cosmetic use. The inventors have found that the present invention can be obtained, and have completed the present invention.
That is, according to the present invention, the particle size of the 50% integrated volume is 0.3 to 6%.
μm and the integrated volume ratio of particles of 3 μm or less is 2
5% or more atomized cellulose material and said atomized cellulose
A cosmetic composition comprising a cream or an emulsion containing water as an essential component in an amount of at least twice the amount of water.

[0009] It is difficult to make cellulose into fine particles by the conventional techniques. For example, even if the particles are made fine by a dry or wet ball mill, a hammer mill, a jet mill, a colloid mill, a three-roll mill, a homogenizer, or the like, the particle size of the accumulated volume is 50%. Could not be reduced to 8 μm or less. Further, even in the case of micronization by an enzymatic method using a cellulose-decomposing enzyme (for example, cellulase onozuka) (for example, JP-A-3-58770, the method of Example 2), the particle size is measured by the particle size measuring means used in the present invention. When measuring the diameter distribution, the cumulative volume is 50%
Did not fall below 20 .mu.m, and all of them settled in water and felt grainy.

However, recently, the present inventors have disclosed a Japanese Patent Application No. 2-1.
Although the cellulose material was finely atomized by the method of No. 72616, the cellulose atomized in this way was mixed with water by coming into contact with water, and was smooth and had a stable surface. Has been found to be of the nature with. As for its properties, it has been found that since the fine particles of cellulose are not dissolved, there is no sticky sticky feeling as in a water-soluble polymer solution, and a white opaque appearance is exhibited. It has also been found that when applied to the skin, it gives a creamy feel with a smooth, stretchy feel, and a cosmetic composition that can reduce the oil content by mixing this micronized cellulose with water. completed.

The content of the finely divided cellulose material in the composition of the present invention is preferably 0.5% by weight to 25% by weight.
If it is less than 0.5% by weight, the effect of thickening is low and there is no effect of lowering the oil content, and if it exceeds 25% by weight, the viscosity becomes too high, making it difficult to apply to the skin. In order to make a substantial cosmetic composition, usually, various components (for example, pigments, fragrances, preservatives, surfactants, ultraviolet absorbers, antioxidants,
(Alcohols, beautiful skin components, oil components, etc.) are mixed, so the remainder will be the water content.However, to obtain smoothness and good elongation by mixing the micronized cellulose material and water together Preferably, water is contained at least twice as much as the micronized cellulose material.

In the present invention, the particle diameter of 50% of the cumulative volume refers to the spherical equivalent diameter of the particles when the cumulative volume becomes 50% of the total volume of the particles, and is also called the median diameter. The particle size of the micronized cellulose particles contained in the composition of the present invention needs to be 0.3 μm to 6 μm.
If the median diameter is less than 0.3 μm, agglomeration is likely to occur, while if it exceeds 6 μm, the smoothness is reduced and it is inappropriate.

Conventional creamy cosmetic compositions include oily creams having an oil content as high as 100% to about 40% by weight, neutral creams having an oil content of about 50% to about 30% by weight, There are three types of slightly oily creams having an oil content of about 40% to about 20% by weight. The creamy cosmetic composition of the present invention can arbitrarily reduce the oil content, and in extreme cases can also provide a novel cream containing no oil.

A composition of stearic acid or the like for obtaining a refreshing feeling when applied to the skin, a composition of propylene glycol, NMF component or glycerin for obtaining a moisturizing effect, or a composition of squalane or lanolin for obtaining an emollient effect. An appropriate amount of an oil component such as the above may be appropriately contained depending on the purpose. Further, the conventional emulsion-type cosmetic composition generally has an oil content of about 5% by weight to about 15% by weight, whereas the emulsion-type cosmetic composition of the present invention has an oil content of about 5% by weight. 0%
Can be reduced to

Thus, according to the present invention, a creamy and milky cosmetic composition having a white and smooth elongation can be provided even if unnecessary oil components are arbitrarily reduced.

[0016]

The present invention will be described in detail with reference to the following examples. They do not limit the scope of the invention. In addition, physical property evaluation was performed as follows. (1) Particle size Shimadzu laser diffraction particle size distribution analyzer (SAL
(D-1100 type), the suspension to be measured is diluted with distilled water to 0.1% by weight, and the measurement is carried out in a state where secondary aggregation of particles is broken by an ultrasonic transmitter built in the apparatus.

In the measurement, the measurement range was set to 0.1 to 45 μm, thereby setting the measurement range (Mi
e) It is calculated using the relationship between the scattering intensity and the particle size derived from the theoretical scattering formula (incorporated in the measuring device). In addition, the refractive index is set to a standard refractive index set value of 1.7-0.2i, and the calculation method for obtaining the particle size distribution is a direct calculation method using the least squares theory.

The number of measurements for one sample is seven,
The measurement interval is 2 seconds. A sample diluted evenly with distilled water to 0.1% by weight is measured using a flow cell, but the built-in ultrasonic transmitter is always on and the ultrasonic wave is applied for at least 1 minute to aggregate. The measurement is performed after the prevention. (2) Oil content The content of the oil component is indicated by weight%. (3) Stability over time After standing at 40 ° C. for one month, those with no change are marked with ◎, and those with changes such as separation are marked with x. (4) Viscosity The viscosity measured at 20 ° C. with a Gluckfield viscometer is indicated in centipoise. (5) Elongation and stickiness The sample was actually used by 10 panelists, and the elongation was good, slightly good, slightly poor, and poor in four stages. The stickiness was not sticky and slightly sticky. 8 or more people rated as good or no stickiness were rated as ◎, 5 to 7 as ○, 2 to 4 as Δ, and 0 to 2 as ×. .

[0019]

Examples 1 and 2, Comparative Examples 1 to 4 Purified cotton linter pulp is subjected to a pressurized steam treatment at 15 kg / cm ² for 40 minutes, and then the pressure is released at a stretch to discharge the pulp into the atmosphere, so-called steam explosion. Processing was performed. The treated pulp was sufficiently washed with water to remove water-soluble impurities, and then wet-pulverized as a water slurry with a pearl mill (trade name) manufactured by Ashizawa Co., Ltd. to obtain finely divided cellulose materials a and b having different pulverization degrees. . The particle diameter of 50% of the cumulative volume of a and b and the cumulative volume ratio of the particles of 3 μm or less are 3.51 μm, 43.0% and 0.32 μm, 9 respectively.
It was 8.8%. Next, creams having the formulations shown in Table 1 were prepared by a conventional method, and panel evaluations were made on oil content, stability over time, viscosity, and good elongation and stickiness.

Examples 1 and 2, which are compositions of the present invention,
The oil content was reduced to one-fifth compared to the conventional cream comparative example 1 and the stickiness was greatly improved, but the stability over time, the viscosity and the good elongation maintained the essential properties of the original cream. . On the other hand, those obtained by increasing the viscosity of methylcellulose or veegum to reduce the oil content were deteriorated in good elongation and stickiness.

[0021]

Example 3, Comparative Example 5 Using a obtained in Examples 1 and 2, an emulsion cosmetic composition was produced by a conventional method according to the formulation shown in Table 2. In Example 3, which is the composition of the present invention, the oil content was reduced and there was no stickiness.

[0022]

Examples 4 and 5 and Comparative Examples 6 and 7 Softwood sulphite-dissolved pulp (N-DSP) was immersed in a caustic soda solution having a concentration of 52% at 52 ° C. and pressed to obtain a cellulose concentration of 33% by weight.
Of alkali cellulose. This was subjected to alkali oxidative decomposition at 48 ° C. for 168 hours in an atmosphere having an oxygen concentration of 50%.

Next, after washing with water to remove alkali, water was added to form a slurry, and the slurry was wet-pulverized with a Pearl Mill (trade name) manufactured by Ashizawa Corporation to obtain a finely divided cellulose material. The particle size of this 50% integrated volume is 1.7 μm,
The cumulative volume ratio of the particles having a size of 3 μm or less was 72.1%. Using this micronized cellulose material, a cream having an oil content of 0% by weight was prepared according to the formulation in Table 3.

Further, the finely divided cellulose dispersed in water is repeatedly diluted and centrifugally settled with isopropyl alcohol to replace water with alcohol, and then replaced with cetanol according to the formulation of Table 4 to prepare a cream (ointment). ) Was adjusted to see good growth. The cream of Example 4 was almost indistinguishable from normal cream in appearance, even though it contained no oil. Further, from Table 4, it was found that a cream having good elongation was obtained by setting the content of water at least twice that of the micronized cellulose.

[0025]

[Table 1]

[0026]

[Table 2]

[0027]

[Table 3]

[0028]

[Table 4]

[0029]

EFFECT OF THE INVENTION The creamy and emulsion cosmetic compositions of the present invention can arbitrarily reduce the oil content without impairing the conventional physical properties, and provide a refreshing feeling without stickiness. And can be used with peace of mind for people with oily skin.

Claims (1)

(57) [Claims] 1. A particle having a cumulative volume of 50% having a particle size of 0.3 to 6 μm.
And the integrated volume ratio of particles having a particle size of 3 μm or less is 25%.
The above micronized cellulose material and the micronized cellulose
A cosmetic composition characterized by being a cream or an emulsion containing water as an essential component in an amount of at least twice as much as water.