JPH0532519A - Cosmetic composition - Google Patents

Abstract

PURPOSE:To obtain a creamy and emulsion-like cosmetic composition capable of arbitrarily reducing the oil content consisting essentially of specific amounts of atomized cellulose raw materials having two kinds of specific particle diameters and water. CONSTITUTION:A creamy and emulsion-like cosmetic composition obtained by combining atomized cellulose particle raw materials wherein 50% of the particle diameters in terns of integrated volume are 0.3-6mum (median diameter, expressed by the particle diameter converted into sphere shape when integrated volume of the particles becomes 50% based on the volume of whole particles) and >=25% have <=3mum particle diameter (integrated volume of particles) with water, integrally mixing with water and capable of exhibiting smooth properties having a stable surface gloss. The composition has no paste-like sticky feeling such as water soluble high polymer solution, because cellulose fine particles are not dissolved and exhibits white opaque appearance. When the composition is applied to skin, the composition gives creamy feeling with spreadability to the skin.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to cosmetic compositions. More particularly, it relates to cosmetic creamy and emulsion compositions.

[0002]

2. Description of the Related Art Creams and milky lotions for cosmetics have oil as an essential ingredient, and are manufactured in various ways from anhydrous oily creams to water-containing ones mixed or emulsified with water, but they have uniform viscosity. It will be the base that has been mixed and adjusted. By utilizing the viscosity of this creamy or milky liquid, it is intended to spread thinly on the skin and to exert various skin beautifying effects.

Cosmetics having such a viscosity are called creams or emulsions. In order to produce this viscosity, glycerin, propylene glycol, higher fatty acids, higher alcohols, etc. which are compatible with water, and further Is the basis of blending by emulsifying beeswax, lanolin, vegetable oils, fatty acids, higher alcohols, hydrocarbons, squalane, etc., which are incompatible with water, with water.

That is, it is premised that oil is heavily used in some form. In this way, it is intended to replenish the skin with oil and water to prevent cracking and dryness, and in some cases to expect a beautiful skin effect due to the medicinal effect of the medicinally-active ingredient appropriately blended. However, in the conventional technique, since a large amount of oil is used to make the solution viscous to give a cream or emulsion, a refreshing feeling is not obtained and stickiness is produced.
Further, since a large amount of oil contained in the skin of oily skin induces acne and pimples, it is not appropriate to use cosmetics which are made to be viscous by frequently using such oil.

In order to overcome such obstacles, it is possible to increase the viscosity with a mere water-soluble polymer such as methyl cellulose, ethyl cellulose, carboxymer cellulose salt, polyvinyl alcohol, etc., but the aqueous solution is transparent and is like a paste. There is a feeling that it is not very sticky and is not called cream or emulsion. On the other hand, water-swelling clay minerals such as Veegum (trade name of Vanderbilt), Laponite (trade name of Laporte), Smecton (trade name of Kunimine Industry), tetrafluorosilicon mica (product of Topy Industry) When thickened with layered silicate minerals belonging to the genus Smectite, which are commercially available under the name of etc., the particle size when swollen in water is large and rough, and therefore smooth like O / W and W / O emulsions. It is not suitable as a cosmetic because it does not show any growth or shine and some are colored.

As described above, it has been desired to develop a cosmetic cream or emulsion base which can reduce the oil content as much as possible without impairing the conventional physical properties.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a creamy or emulsion cosmetic composition capable of arbitrarily reducing the oil content.

[0008]

Means for Solving the Problems The inventors of the present invention have made extensive studies in order to solve the above-mentioned problems, and as a result, it has been found that a creamy or emulsion composition for cosmetics capable of reducing the content of oil can be obtained. They have found that they can be obtained and have completed the present invention.
That is, the present invention has a particle size of 0.3 to 6 with an integrated volume of 50%.
The cumulative volume ratio of particles having a size of 3 μm or less is 2 μm.
A cosmetic composition, characterized in that it is in the form of a cream or an emulsion containing 5% or more of finely divided cellulose material and water as essential components.

It is difficult to make cellulose into fine particles by the conventional technique. For example, even if it is atomized by a dry or wet ball mill, a hammer mill, a jet mill, a colloid mill, a three roll mill, a homogenizer, etc., a cumulative volume of 50% is obtained. Could not be less than 8 μm. In addition, even when finely divided by an enzymatic method using a cellulolytic enzyme (for example, cellulase Onozuka) (for example, the method of Example 2 of JP-A-3-58770), the particles are densely packed by the particle size measuring means used in the present invention. When measuring the diameter distribution, the cumulative volume is 50%
The particle size did not fall below 20 μm, and both of them settled in water and had a rough feeling.

However, recently, the present inventors have filed Japanese Patent Application No. 2-1.
We succeeded in extremely finely atomizing the cellulose material by the method of No. 72616, but the cellulose atomized in this way mixes together with water when it encounters water, and it has a smooth and stable surface. It has been found to be of a nature with. It was found that, because the fine particles of cellulose are not dissolved, they do not have a sticky, sticky feeling like a water-soluble polymer solution, and have a white opaque appearance. It has also been found that when applied to the skin, it imparts a smooth, creamy feel to the skin, and a cosmetic composition capable of reducing the oil content by mixing this micronized cellulose with water is provided. 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 thickening effect is low and the oil content is not lowered, and if it exceeds 25% by weight, the viscosity becomes too high and it becomes difficult to apply it to the skin. In order to obtain a substantial cosmetic composition, various compounding ingredients (for example, pigments, fragrances, preservatives, surfactants, ultraviolet absorbers, antioxidants,
Alcohols, skin-refining ingredients, oil ingredients, etc.) are added, so the balance will be water content, but in order to achieve good smoothness and elongation by mixing the finely divided cellulose material and water together. It is preferable that the water content is at least twice that of the micronized cellulose material.

In the present invention, the particle size with an integrated volume of 50% means the spherical equivalent diameter of a particle when the integrated volume is 50% with respect to the volume of the entire particle, and is also called the median size. 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 tends to occur, while if it exceeds 6 μm, the smoothness deteriorates, which is inappropriate.

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

Blending of stearic acid and the like for obtaining a refreshing feel when applied to the skin, blending of propylene glycol, NMF components and glycerin for obtaining a moisturizing effect, and blending of squalane and lanolin for obtaining an emollient effect. The appropriate amount of the oil component such as the above may be contained depending on the purpose. In addition, the conventional emulsion cosmetic composition generally has an oil content of about 5 wt% to about 15 wt%, but the emulsion cosmetic composition of the present invention has an oil content of 0%
It can be reduced to

As described above, according to the present invention, it is possible to provide a creamy or milky cosmetic composition which is white and has smooth spread even if unnecessary oil components are arbitrarily reduced.

[0016]

The present invention will be described in detail with reference to the following examples. These do not limit the scope of the invention. The physical properties were evaluated according to the methods described below. (1) Particle size Shimadzu's laser diffraction particle size distribution analyzer (SAL
D-1100) is used to dilute the suspension to be measured to 0.1% by weight with distilled water, and the ultrasonic agitation built into the apparatus is used to measure the secondary agglomeration of the particles.

In the measurement, the measurement range was set to 0.1 to 45 μm, and the
e) It will be calculated using the relationship between the scattering intensity and the particle diameter derived from the theoretical scattering formula (built into the measuring device). In addition, the refractive index is set to a standard refractive index setting value of 1.7 to 0.2i, and the calculation method for obtaining the particle size distribution is to use the direct calculation method using the least square method theory.

The number of measurements for one sample is 7 times,
The measurement interval is 2 seconds. A sample uniformly diluted with distilled water to 0.1% by weight is measured using a flow cell, but the built-in ultrasonic transmitter is always turned on, and ultrasonic waves are applied for at least 1 minute to aggregate. Measurement is performed after preventing. (2) Oil content The content of the oil component is expressed in% by weight. (3) Temporal stability After being left at 40 ° C. for 1 month, ◎ indicates that no change was observed, and x indicates that change such as separation was observed. (4) Viscosity Measured at 20 ° C. with a Gluckfield viscometer is displayed in centipoise. (5) Elongation and sticky feeling The sample was actually used by 10 panelists, and there were four grades of good, slightly good, slightly poor and bad in terms of elongation, and non-greasy and slightly sticky in terms of sticky feeling. 8 or more were rated as good or non-sticky by 3 grades of sticky, and 5 or 7 were good, 2 to 4 were fair, and 0 to 2 were bad. .

[0019]

Examples 1 and 2, Comparative Examples 1 to 4 Purified cotton linter pulp is subjected to pressure steam treatment at 15 kg / cm ² for 40 minutes, and then the pressure is released all at once and discharged into the atmosphere, so-called steam explosion. Treated. The treated pulp was washed thoroughly with water to remove water-soluble impurities, and then wet-milled 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 size 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 a panel evaluation was performed for oil content, stability over time, viscosity, good elongation, and stickiness.

The compositions of the present invention, Examples 1 and 2, are:
Compared to the conventional cream comparative example 1, the oil content was reduced to 1/5 and the sticky feeling was greatly improved, but the stability with time and the goodness of viscosity and elongation maintained the original necessary characteristics of the cream. .. On the other hand, in the case where the oil content was reduced by thickening with methyl cellulose or bee gum, good elongation and stickiness were deteriorated.

[0021]

Example 3, Comparative Example 5 Using the a obtained in Examples 1 and 2, an emulsion cosmetic composition was prepared 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 sticky feeling.

[0022]

[Examples 4 and 5, Comparative Examples 6 and 7] Softwood sulfite method dissolving pulp (N-DSP) was dipped in a caustic soda solution having a concentration of 18% at 52 ° C and then pressed to have a cellulose concentration of 33% by weight.
Of alkali cellulose. This was subjected to alkaline oxidative decomposition at 48 ° C. for 168 hours in an atmosphere with an oxygen concentration of 50%.

After washing with water to remove the alkali content, water was added to form a slurry, and wet pulverization was performed with a pearl mill (trade name) manufactured by Ashizawa Co., Ltd. to obtain a finely divided cellulose material. The particle size of this 50% cumulative volume is 1.7 μm,
The cumulative volume ratio of the particles of 3 μm or less was 72.1%. Using this finely divided cellulose material, a cream having an oil content of 0% by weight was prepared according to the formulation shown in Table 3.

Further, the micronized cellulose dispersed in water was diluted with isopropyl alcohol and centrifugal sedimentation was repeated to replace water with alcohol and then with cetanol. ) Was adjusted to see the good growth. Although the cream of Example 4 contained no oil, it was almost indistinguishable from the ordinary cream in appearance. Further, from Table 4, it was possible to obtain a cream having good elongation by setting the content of water to be twice or more 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 milky cosmetic compositions of the present invention can arbitrarily reduce the oil content without deteriorating the conventional physical properties, and have a refreshing feeling without stickiness. It can also be used with peace of mind for people with oily skin.

Claims (1)

Claims: 1. The particle size with an integrated volume of 50% is 0.3 to 6 μm.
And the cumulative volume ratio of particles of 3 μm or less is 25%
A cosmetic composition comprising the above-mentioned micronized cellulose material and water as essential components in the form of a cream or emulsion.