JP2656773B2 - Cosmetics - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention has a sufficient ability to protect the skin from ultraviolet rays that cause spots and freckles, which are a major problem for women's skin, and the phenomenon that the skin is colored white. It is intended to provide a cosmetic that imparts a desired color on the skin while keeping the color as low as possible.

[Prior art] In order to protect the skin from ultraviolet rays, which are the great enemy of women's skin, there are two methods: one that utilizes the absorption of ultraviolet rays by an ultraviolet absorber and the other that utilizes the scattering of ultraviolet rays by powders, particularly titanium oxide. Are known.

In the method using an ultraviolet absorber, a large amount of the ultraviolet absorber must be added to enhance the ultraviolet protection effect, and problems such as sensitization and solubility by the ultraviolet absorber are likely to occur.

On the other hand, powders, particularly titanium oxide, have a large effect of scattering ultraviolet rays, and are the most effective method for protecting skin from ultraviolet rays.

However, since powders, particularly titanium oxide, cannot be dispersed in a water system from transparent to translucent, applying the powder to the skin causes the skin to be colored white.

By the way, the recent consumer's preference is that they tend to prefer a natural finish and a refreshing feel, not a whitish finish, and do not like an impressive finish. Therefore, there is a need to reduce the blending of powders, especially titanium oxide. However, although the finish matches the taste of the consumer, even in this case, even if it contains an ultraviolet absorber,
It was difficult to adequately protect the skin from ultraviolet rays. Also,
Techniques such as soap gel, activator gel, and water-soluble polymer gel for stably blending powders have been used, but these techniques cause slimy, sticky, and profound feelings It does not match the taste of consumers who prefer the feel. Further, the water-soluble polymer binds to the titanium dioxide, hinders the dispersion of the titanium dioxide, and forms titanium dioxide particles or precipitates, which is unsightly in appearance. On the other hand, the gel formed by 3-octahedral smectite has an extremely refreshing feel, and does not feel any slimy, sticky, or solid feeling at all. In addition, it does not combine with titanium dioxide and does not form titanium dioxide grains or precipitate.

[Problems to be Solved by the Invention] There is a strong demand for the development of an aqueous gel or an aqueous gel-based emulsion without causing precipitation or the like of a sol obtained by transparently dispersing titanium dioxide having an excellent ultraviolet protection effect. I was

[Means for Solving the Problem] The inventors of the present invention have conducted intensive studies and have found that while having a sufficient UV protection effect, a natural finish and a refreshing feeling demanded by consumers while suppressing whiteness. The invention of a cosmetic having the following.

That is, the present invention relates to a transparent sol obtained by dispersing 3-octahedral smectite and (a) ultrafine titanium oxide having a maximum particle size of 60 mμ or less and an average particle size of 5 to 25 mμ in a water-containing polyhydric alcohol, or (b) The present invention relates to a cosmetic comprising a transparent sol obtained by dispersing ultrafine titanium oxide particles having a maximum particle size of 60 mμ or less and an average particle size of 5 to 25 mμ in water, and a polyhydric alcohol.

 Hereinafter, the present invention will be described in detail.

First, the transparent sol applied to the present invention has a maximum particle size of 60.
It is a sol obtained by dispersing 1 to 30% by weight of ultrafine titanium oxide particles having a particle size of 5 μm or less and an average particle size of 5 to 25 μm in water or 99 to 70% by weight of a water-containing polyhydric alcohol at an arbitrary ratio. (Hereinafter abbreviated as titania sol). The mixing ratio of this tatinia sol to the total amount of the cosmetic is 0.01 to 20.0% by weight, and preferably 0.05 to 10.0% by weight, in terms of the amount of titanium oxide. If the amount is less than 0.01% by weight, the protective effect against ultraviolet rays becomes poor, and if it exceeds 20.0% by weight, whiteness on the skin becomes too conspicuous.

Next, the polyhydric alcohol used in the present invention is a substance which is liquid at normal temperature such as glycerin, 1,3-butylene glycol, propylene glycol, polyethylene glycol having an average molecular weight of 400 or less, and these substances may be used alone or separately. Two or more kinds can be used as a mixture. The role of the polyhydric alcohol in the present invention is to adjust the whiteness on the skin when volatile substances such as water and alcohol are volatilized from the skin after applying the cosmetic according to the present invention. That is, when the polyhydric alcohol is not contained at all, the skin is colored white, and when it is contained, the skin is pressed white. Therefore, the amount of the polyhydric alcohol contained in the cosmetic of the present invention is determined by the finish required for the cosmetic.

Next, the 3-octahedral smectite used in the present invention is obtained by natural and synthetic methods, for example, montmorillonite, artificial smectite, etc., and is physically and chemically dispersed in an aqueous solution in a colloidal form. It has the ability to form strong gels with thixotropic properties. In cosmetics, it has a much lighter and better feel than soap gel, activator gel and water-soluble polymer gel.

The role of the 3-octahedral smectite in the present invention is to incorporate dyes, powders, and the like into the gel structure and stably mix them, and the compounding ratio is 0.1 to 10.0% by weight, preferably
0.5 to 6.0% by weight. If the amount is less than 0.1% by weight, it is difficult to stably mix pigments and powders, and if the amount is 10.0% by weight or more, the gel strength is too strong to be used as a cosmetic.

The cosmetic of the present invention can be produced by a usual method.

That is, a jelly-like cosmetic in which titania sol and 3-octahedral smectite are dispersed in water to form a gel as it is,
Alternatively, titania sol and 3-octahedral smectite are dispersed in an aqueous phase and mixed with an oil phase before a gel is formed to obtain an emulsion.

The cosmetics of the present invention include lotions, emulsions, creams,
Jelly-like cosmetics, under makeup, foundation, control colors, etc.

[Examples] Examples of the present invention and comparative examples will be described. Also,
In the examples, the amounts are shown in parts by weight.

In addition, a transparent sol consisting of 10% of ultrafine titanium oxide and 90% of water was added to titania sol H, and 10% of ultrafine titanium oxide and 1,3-
The transparent sol consisting of 40% butylene glycol and 50% water is abbreviated as titania sol P.

<Example 1-1> Translucent control color (formulation formulation) Titania sol P 15.0 3-octahedral smectite 3.0 torque 1.0 Yellow iron oxide 1.0 pure water 80.0 (production method) 3-octahedral smectite and pure water The mixture was stirred and mixed at room temperature with a three-one motor at 500 rpm, and when the whole had formed a uniform gel, all the remaining raw materials were added and stirred for another 5 minutes to obtain a translucent control color.

<Example 1-2> Translucent control color (formulation formulation) titania sol H 15.0 3-octahedral smectite 3.0 talc 1.0 yellow iron oxide 1.0 1,3-butylene glycol 6.0 pure water 74.0 (production method) 3-octahedral smectite Pure water is charged into a container, and mixed with a three-one motor at room temperature at 500 rpm and mixed at a constant speed. When a uniform gel is formed, all the remaining ingredients are added, and the mixture is further stirred for 5 minutes to give a translucent control. Get the color.

<Example 2> Foundation (Formulation) (Production method) Add the powder to the oil phase heated and dissolved at 80 ° C and disperse it well with a homomixer. An aqueous phase, which has been previously heated to 80 ° C. and uniformly dispersed therein, is gradually added thereto. After the reversal emulsification, the remaining amount is added, and the mixture is cooled to 30 ° C. to obtain an oil-in-water foundation.

<Example 3> Under makeup (combination components) (Production method) Add powder to the oil phase heated and melted at 70 ° C and disperse well with a homomixer. An aqueous phase which was previously heated to 70 ° C. and uniformly acidified was gradually added thereto, and the remaining amount after inversion emulsification was added.
Cool to ℃ to obtain oil-in-water type under makeup.

<Comparative Example 1> Translucent control color (A) Fine particle titanium oxide (average particle diameter 30 mμ) 1.5% 3-octahedral smectite 3.0 talk 1.0 Yellow iron oxide 1.0 1,3-butylene glycol 6.0 pure water 87.5 (manufactured by Method) 3-Octahedral smectite and pure water are charged into a container and mixed by stirring with a three-one motor at room temperature at 500 rpm to form a uniform gel. Titanium, talc and heat of yellow oxidation are added, mixed well with stirring, and 1,3-butylene glycol is further added and stirred for 5 minutes to obtain a translucent gel-type control color.

<Comparative Example 2> Foundation (A) (Production method) Add the powder to the oil phase heated and dissolved at 80 ° C and disperse it well with a homomixer. The aqueous phase which was previously heated to 80 ° C and uniformly dispersed therein was gradually added thereto, and the remaining amount was added after inversion emulsification, and the mixture was cooled to 30 ° C to obtain an oil-in-water foundation.

[Effects of the Invention] The fact that the product of the present invention is excellent in UV protection effect and has a refreshing feel without a slimy feeling will be described in detail.

First, it is shown that the present invention has a sufficient ultraviolet protection effect while suppressing whiteness on the skin.

<Experiment Method and Results> (Sample) (i) Translucent control color of Example 1-1 (ii) Translucent control color of Example 1-2 (iii) Translucent control color of Comparative Example 1 (A) First, it is shown that the product of the present invention has excellent whiteness and excellent transparency.

(Measurement method) 4 g of a sample is precisely weighed in a cell having a diameter of 3.1 cm and left at room temperature for one day to be air-dried. Place a black plate on top of the cell, and use color difference meter Z-10.
The L value due to reflected light is measured with a 01DP type (manufactured by Nippon Denshoku Industries). The L value measured using only the cell without filling the sample is defined as a blank value.

As is clear from the table, the samples (i) and (ii) of the product of the present invention
However, the L value is smaller than that of the comparative sample (iii). This is because the titanium oxide contained in sample (iii) remains on the skin 1,3
While transparency cannot be obtained even with butylene glycol, in the samples (i) and (ii) according to the present invention, titanium oxide is blended in the form of a transparent sol, and the transparency of 1,3 butylene glycol acts. Is obtained.

Next, it will be shown that the product of the present invention has a sufficient ultraviolet protection ability.

(Measurement Method) The translucent control colors of Example (1) and Comparative Example 1 were each applied to a quartz glass plate to a uniform thickness using a doctor plate of 0.5 mil, and then allowed to stand for one day and night to completely remove volatile components. The sample is volatilized, and the transmittance of ultraviolet rays is measured using a Shimadzu spectrophotometer UV-240.

(Results) The measurement results are shown in FIG. As can be seen from the figure, the product of the present invention and Comparative Example 1 show almost the same ultraviolet absorption waveform, indicating that the transmittance is low at any wavelength of the ultraviolet light.

Next, it is shown that the product of the present invention has a refreshing feel without a slimy feeling.

<Experiment method and results> (Sample) (i) Foundation of Example 2 (ii) Foundation of Comparative example 2 (A) (Evaluation method) A sample was actually applied to the face using 10 female employees of the Company. Sensory evaluation was performed. The panelists were divided into two groups of 5 persons. The first group applied the foundation of Example 2 and then washed the face 10 minutes later, and applied the foundation of Comparative Example 2 30 minutes after the face washing. The second group is comparative example 2 opposite to the first group.
Was applied first, and the foundation of Example 2 was applied later.

As described above, the product of the present invention had an extremely excellent feel. This is because the foundation of Comparative Example 2, which is a comparative example, uses soap gel in order to stably mix pigments and powders, and thus has a slimy feeling and stickiness. On the other hand, the foundation of Example 2 of the present invention has a very refreshing feel because the pigment and the powders are stably compounded by the gel of 3-octahedral smectite instead of the gel.

[Brief description of the drawings]

FIG. 1 shows the relationship between the wavelength of ultraviolet light and the transmittance. In FIG. 1, a indicates Example 1 and b indicates Comparative Example 1.

Continuation of the front page (56) References JP-A-62-267014 (JP, A) JP-A-61-229809 (JP, A) JP-A-58-62106 (JP, A) JP-A-59-62517 (JP, A) , A)

Claims (1)

(57) [Claims] 1. A 3-octahedral smectite and (a) a maximum particle size
A transparent sol obtained by dispersing ultrafine titanium oxide particles having an average particle size of 5 to 25 mμ or less in a water-containing polyhydric alcohol, or (b) a maximum particle size of 60 mμ or less and an average particle size of 5 to 2
A cosmetic comprising a transparent sol obtained by dispersing 5 mμ of ultrafine titanium oxide particles in water and a polyhydric alcohol.