JPH08310914A - Anti-suntan cosmetic and its production - Google Patents

Abstract

PURPOSE: To obtain an ultraviolet scattering agent-dispersed composition especially used for suntan-preventing cosmetics by preliminarily producing a master batch dispersion before an inorganic fine powdery material is added to a system such as a cosmetic, and subsequently adding the master batch dispersion to the system. CONSTITUTION: An inorganic fine powdery material having an average particle diameter of 0.001-0.1μm is dispersed in the mixture of an oily component having a viscosity of <=100000cps at the ordinary temperature and the ester of a polyglycerol or saccharide with a fatty acid substantially without containing >=10μm aggregates. The dispersing process is preferably performed with a mill having a high shearing force. The inorganic fine powdery material is preferably an ultraviolet scattering material. The oily component is a hydrocarbon, an animal oil, a vegetable oil, a synthetic triglyceride, etc. The polyglycerol or the saccharide is preferably diglycerol, hexaglycerol, decaglycerol, sucrose, etc. The inorganic fine powdery material, the oily component, and the ester are preferably compounded in amounts of 1.0-75.0wt.%, 1.0-90.0wt.% and 0.01-20.0wt.%, respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inorganic fine powder dispersion composition used in a masterbatch for stably dispersing a fine inorganic fine powder, particularly an ultraviolet scattering agent dispersion composition used in sunscreen cosmetics. Regarding

[0002]

2. Description of the Related Art In order to stably disperse a fine powder such as a pigment in a system, the fine powder is kneaded in advance in a small amount of resins to obtain a uniform dispersion composition, which is a predetermined component constituting the system. The technique of mixing with is already known and used in various fields. However, the average particle size is 0.001 to 0.1 μm
There is no known composition for a masterbatch for uniformly dispersing extremely fine particles.

In particular, ultraviolet scattering agents such as zinc oxide, acid value titanium, acid value zirconium, and kaolin, which are mixed in sunscreen cosmetics and the like, are not deteriorated by ultraviolet rays and are not transdermally absorbed, so that they have no adverse effect on skin or irritation. However, there is a problem in stability in the blended cosmetics, and improvement thereof has been desired. In addition, these UV scattering agents have high hiding power and remain white on the skin when applied,
It was inconvenient in appearance. In order to improve this, a method has been attempted in which the particles are made finer to make the white color less noticeable.However, even if this finely divided inorganic powder is blended into a cosmetic composition as it is, secondary aggregation causes secondary sunblock. In addition to not being able to be expected to have a sufficient effect as a cosmetic composition, there was the inconvenience that the feeling of use was poor. Therefore, in the field of sunscreen cosmetics, there is a demand for a technique for stably dispersing as small a UV-scattering agent as possible in order to obtain a sunscreen effect, a good cosmetic finish, and a good feeling in use.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a technique for stably dispersing an inorganic fine powder, particularly a technique for stably dispersing a finely divided UV scattering agent in a sunscreen cosmetic. To do.

[0005]

Means for Solving the Problems As a means for solving the above problems, the present invention is a technique for preparing a masterbatch dispersion in advance before mixing inorganic fine powder with a system such as cosmetics, and mixing it in the system. To adopt. That is, according to the present invention, an inorganic fine powder having an average particle diameter of 0.001 to 0.1 μm is (1) 1
An oily component having a viscosity of not more than 0.00000 cps,
(2) Manufacture of an inorganic fine powder dispersion composition characterized in that it is dispersed in a mixture of one or more esters of polyglycerin or saccharides and fatty acids without substantially containing associated particles of 10 μm or more. The present invention relates to a method and an inorganic fine powder dispersion composition obtained thereby.

The inorganic fine powder used in the present invention is a single crystal substance such as zinc oxide, titanium oxide, zirconium oxide or selenium oxide used as an ultraviolet scattering agent, a molten crystal substance, iron ion, aluminum ion or alkaline earth metal. Ion-doped crystal compositions, and the like. These fine particle metal oxides may be a mixture of two or more kinds, and the surface of these fine particle metal oxides is coated with a metal oxide such as aluminum oxide or zirconium oxide, silicon, amino acid, lecithin, polyethylene, metal soap or the like. It may be one.

The average particle size of the inorganic fine powder is 0.001 to 0.001.
The range is 1 μm, and more preferably 0.01 to 0.08.
μm. The particle size refers to that measured by a laser diffraction method. Almost no particles with an average particle size smaller than 0.001 μm are actually available. If the average particle size is larger than 0.1 μm, the hiding power becomes strong when inorganic powder is used in order to exert a high UV protection ability. It remains white on the top, which causes inconvenience in appearance. The inorganic fine powder is 1.0 to 75.0% by weight in the dispersion composition, and more preferably 3.0 to 65.
0% by weight, particularly preferably 30.0 to 63.0% by weight can be added. If the amount of the inorganic fine powder is too small, it is meaningless as a masterbatch and the dispersion tends to be non-uniform.
If it is blended in an amount of more than 0% by weight, the viscosity will be too high and a large amount of energy will be required for dispersion, which is not economical. In addition, the redispersibility when redispersing this in a base material for cosmetics is reduced,
Aggregated particles are likely to occur, resulting in a whitish finish. In addition, the feeling of use such as sticking and spreading decreases. Further, when this is used in a sunscreen cosmetic, the effect becomes insufficient due to aggregation.

The oily component is 100,000 at room temperature (20 ° C.)
cps or less, more preferably 10,000 cps or less,
Particularly preferred are hydrocarbons of 5,000 cps or less, animal and vegetable oils, liquid higher fatty acids, liquid higher alcohols, synthetic triglycerides, synthetic esters, silicones and the like. If the viscosity is higher than 100,000 cps, the viscosity becomes too high and a large amount of energy is required for dispersion, which is not economical, and the dispersibility of the inorganic fine powder is poor, which hinders formation of low-order particles. Hydrocarbons as preferable specific examples of the oil component include light liquid paraffin, light liquid isoparaffin, liquid paraffin, α-olefin oligomer, liquid isobutylene, squalane and the like.

The animal and vegetable oils include avocado oil, almond oil, sesame oil, soybean oil, camellia oil, castor oil, turtle oil,
Mink oil and the like can be mentioned. As liquid higher fatty acids,
Examples thereof include undecylenic acid, isostearic acid, oleic acid and the like. Examples of liquid higher alcohols include 2-hexyldecanol, isostearyl alcohol, oleyl alcohol, and 2-octyldodecanol.
Examples of the synthetic triglycerides include glyceryl tri (capryl / caprin) acid, glyceryl trioctanoate, and glyceryl triisopalmitate.

Examples of synthetic esters include diisopropyl adipate, hexyldecyl isostearate, isopropyl myristate, isopropyl palmitate, octyldodecyl myristate, neopentyl glycol dioctanoate, neopentyl glycol dicaprate, diisostearyl malate, and isononane. Examples thereof include isononyl acid, isotridecyl isononanoate, and octyldodecyl lactate. Examples of silicones include dimethylpolysiloxane, methylphenylpolysiloxane, octamethyltetrasiloxane, octamethylcyclotetrasiloxane, decamethyltetrasiloxane, decamethylcyclopentasiloxane and dodecamethylcyclohexasiloxane.

As the oily component, one kind or two or more kinds thereof may be used, and it is preferably 1.0 to 90.0% by weight, more preferably 2.0 to 75.0% by weight, particularly preferably 18.0. ~ 6
It is 5.0% by weight. If the amount of the ester used is less than 1.0% by weight, the viscosity of the system is too high and the dispersion requires a large amount of energy, which is not economical. If it is more than 90.0% by weight, the dispersion of the inorganic fine powder is unsatisfactory. It becomes uniform and the UV protection ability decreases. A nonionic surfactant having an HLB of 8 or less and a room temperature viscosity of 100,000 or less, which can be used in cosmetics, may be added to the oily component in an arbitrary addition amount.

The fatty acid forming an ester with polyglycerin or saccharide is a medium or higher fatty acid, for example, saturated or unsaturated, which may have a linear or branched chain having 8 to 22 carbon atoms, more preferably 12 to 18 carbon atoms. Of fatty acids, specifically lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, linoleic acid, erucic acid, isostearic acid. Saponification degree of ester is 180-250
mgKOH / g, more preferably 190-235 mgK
OH / g. The hydroxylation of the ester is 50
˜180, more preferably 55 to 75. The ester content is 0.01 to 20.0% by weight, more preferably 2.0 to 75.0% by weight, and particularly preferably 18.0 to 65.
0% by weight. When the amount of the ester compounded is 0.01% by weight or less, the inorganic fine powder becomes non-uniformly dispersed and the UV protection ability is lowered. If it is more than 65.0% by weight, the viscosity of the system will be too high and a great deal of energy will be required for dispersion, which is not economical.

If desired, the inorganic fine powder dispersion composition of the present invention may be added to a conventional cosmetic such as a surfactant, another oily component, a humectant, a conventional inorganic pigment, an organic pigment, an antioxidant, a preservative, and a fragrance. The additives used can be compounded.

The inorganic fine powder dispersion composition of the present invention is used as a masterbatch for stably dispersing inorganic fine powder of cosmetics, at a temperature of room temperature (20 ° C.) to 80 ° C., and at room temperature 10
An oily component having a viscosity of 0000 cps or less and one or more esters of polyglycerin or saccharides and fatty acids are uniformly mixed, and then the average particle diameter is 0.001 to 0.001.
Add 0.1 μm fine inorganic powder. In the inorganic fine powder composition of the present invention, it is important that the inorganic fine powder is dispersed so that associated particles of 10 μm or more are substantially absent, and therefore, the dissolver, roller mill, ball mill, colloid mill, Hibisu Knead uniformly using a high shear mill such as mix. In particular, in order to add an ultraviolet scattering agent to a sunscreen cosmetic, the inorganic fine powder composition of the present invention is prepared by using the inorganic fine powder in the composition as a base material for cosmetics.
It is preferable that the amount is 0 to 90.0% by weight, more preferably 5.0 to 70.0% by weight. Sunscreen cosmetics are used in the form of creams, emulsions, pastes, sticks and the like.

[0015]

EXAMPLES The present invention will be described in more detail with reference to examples below, but the present invention is not limited to these examples. In the following examples, the sunscreen effect (ultraviolet ray blocking effect) and usability as cosmetics were evaluated as follows. UV protection effect evaluation method SPF value (Sun Protection Factor)
r) was used as an index of the sunburn prevention effect. The higher the SPF value, the higher the effect. The SPF value is measured by the Japan Cosmetic Industry Association SPF measurement method standard (Japan Cosmetic Industry Association SPF Technical Committee; JSCC, Vol. 2).
6, No. 3, 1992).

Usability test A sensory test was performed for "makeup finish" and "elongation of the coated part". Have female panelists (12 to 15 people) apply the sample cosmetics in the usual manner. Regarding "makeup feeling", 5: very natural finish, 4: natural finish, 3: normal, 2: Unnatural finish, 1: Very unnatural finish, 5 stages for "application spread" 5: Very good, 4: Good, 3: Normal, 2: Slightly bad, 1: Bad, The evaluation was made on the basis of the five grades, the total score evaluated was divided by the number of panelists, and the judgment code shown in Table 1 was written as the evaluation score.

[0017]

[Table 1]

Example 1 Preparation of Sun Screen Sticks Examples 1 to 3 Samples of inorganic powder dispersion compositions and sun screen sticks were prepared from the formulations of Table 2 using the preparation methods shown below. When the dispersion after the roller treatment was observed with a stereoscopic microscope, the fine particle titanium oxide was finely dispersed, and aggregated particles of 10 μm or more were not detected. The results of testing the SPF value and usability of the sample are shown in Table 2. Both were excellent in SPF value and usability, and particularly excellent in SPF value.

[Preparation Method] 1. Heat castor oil and dextrin myristate,
After being uniformly dissolved, the fine particle titanium oxide was treated with a roller to prepare an inorganic powder dispersion composition of the present invention. 2. After mixing other ingredients and heating and dissolving, 1. The mixture prepared in (1) was added, and the mixture was uniformly dispersed with a homomixer. 3. After dispersion, the mixture was poured into a mold, rapidly cooled, and molded into a stick shape.

[0020]

[Table 2]

Comparative Examples 1 to 5 Comparative samples were prepared from the formulations in Table 2 using the following preparation methods. In this method, a large number of agglomerated particles having a size of 10 μm or more were observed in the fine particle titanium oxide in the uniform dispersion by the homomixer in step 1. Further, as shown in Table 2, the SPF value of the obtained sample was small and the usability was insufficient.

[Preparation Method] 1. The components except the particulate titanium oxide were heated and uniformly dissolved, then the particulate titanium oxide was added and uniformly dispersed with a homomixer. 2. After the dispersion, the mixture was poured into a mold and rapidly cooled to form a stick.

[Example 2] W / O type sunscreen cream Example 4 The following formulation: Component composition (1) Methylphenylpolysiloxane 12.00 (2) Fine particle titanium oxide (TTO-55 (A): Ishihara Sangyo) 8.00 (3) Dextrin laurate 0.50 (4) Squalene 10.0 (5) Polyoxyethylene-modified dimethylpolysiloxane 5.00 (6) Purified water 54.50 (7) Butylene glycol 8. 00 (8) Preservative A proper amount (9) Sodium chloride 2.00 (10) Perfume An appropriate amount was used to prepare an inorganic powder dispersion composition and a sunscreen cream by the following method.

[Preparation Method] 1. After the components (1) and (3) were heated and dissolved, the component (2) was added, and the mixture was uniformly kneaded with a roller mill. 2. The mixture obtained in step 1 and (4) and (5) were heated to 70 ° C. and stirred to obtain an inorganic powder dispersion composition. 3. Into this, the component (6) which was uniformly dissolved and adjusted to 70 ° C.
(9) was added, and the mixture was homomixed. 4. Cool with stirring, add perfume at 45 ° C., cool to room temperature and then fill into a suitable container to give a sunscreen cream. In the inorganic powder dispersion composition obtained in step 2, the fine particle titanium oxide did not form aggregates having a size of 10 μm or more. The SPF value and usability are shown in Table 3.

[0025]

[Table 3]

Comparative Example 6 Using the same formulation as in Example 4, a sunscreen cream was prepared by the following method. [Preparation Method] 1. Ingredients (1), (3), (4) and (5) at 70 ° C
After being uniformly dissolved by (2), (2) was added and a uniform dispersion was prepared by a propeller mixer. 2. Ingredient (6) that was uniformly dissolved in this and adjusted to 70 ° C
~ (9) was added and the mixture was treated with a homomixer. 3. Cool while stirring, add perfume at 45 ° C, cool to room temperature, and then fill a suitable container with a sunscreen.
Got the cream.

In the dispersion obtained in the step 1, the fine-grained titanium oxide was highly aggregated, and most of the particles were particles of 10 μm or more. The characteristics of the sunscreen cream are as shown in Table 3, and it can be seen that the characteristics are significantly inferior to those of Example 4 using the same raw material components.

Example 5: O / W Cream Cream Day
Ingredient composition (1) stearic acid prepared following Deployment 5.00 (2) sorbitan monoisostearate 3.00 (3) cetanol 3.00 (4) liquid lanolin 5.00 (5), neopentyl glycol dicaprate 10 .00 (6) Fine iron oxide containing iron (TTO-F-2: manufactured by Ishihara Sangyo) 10.00 (7) Dextrin palmitate 1.00 (8) Propylpalazine 0.10 (9) Purified water 45.00 (10) Glycerin 5.00 (11) L-arginine 1.50 (12) Methylparazine 0.20 (13) Bentonite 1.00 (14) Talc 3.00 (15) Titanium dioxide (CR-50: manufactured by Ishihara Sangyo ) 5.00 (16) yellow iron oxide 1.50 (17) black iron oxide 0.02 (18) red iron oxide 0.50 was used to prepare an O / W type cream foundation as follows.

[Preparation Method] 1. After heating and dissolving components (5) and (7), component (6)
Was added to obtain a uniform dispersion with a colloid mill to obtain an inorganic powder dispersion composition of the present invention. 2. Add components (1) to (4) and (8) to this, and add
It was heated to 0 to 85 ° C. and uniformly dispersed (oil phase). 3. Ingredients (9) to (13) were added to a container in which the whole amount was charged, and the mixture was homomixed at 80 to 85 ° C. 4. To this, sufficiently mixed and pulverized (14) to (18) were added with stirring, and subjected to homomixer treatment at 80 to 85 ° C (aqueous phase). 5. The oil phase prepared in Step 2 was added to the aqueous phase prepared in Step 4 and subjected to homomixer treatment. 6. It was cooled to room temperature with stirring. 7. Finally degassed and filled into a container.

In the iron oxide fine particles of the inorganic powder dispersion composition obtained in step 1, aggregated particles of 10 μm or more were not observed,
It was confirmed that they were uniformly dispersed in a non-aggregated state. The finally obtained O / W type cream foundation is S
With PF28, there was a sunscreen effect, and in terms of usability, the elongation during application was good, and a natural finish was obtained.

[0031]

The cosmetics of the present invention are SPs shown in the examples.
As can be seen from the F value, it not only has an excellent effect of protecting the skin from harmful ultraviolet rays, but also has good safety, usability and finish of makeup. It is a valuable cosmetic product that gives a natural appearance.

Claims (8)

[Claims] 1. An inorganic fine powder having an average particle diameter of 0.001 to 0.1 μm, which is (1) an oily component having a viscosity of 100,000 cps or less at room temperature, and (2) an ester of polyglycerin or a saccharide and a fatty acid. A method for producing an inorganic fine powder dispersion composition, which comprises dispersing an associated particle having a particle size of 10 μm or more in a mixture with one kind or two kinds or more without substantially containing it. 2. The method for producing an inorganic fine powder dispersion composition according to claim 1, wherein the inorganic fine powder is dispersed in the mixture of (1) and (2) by using a high shearing force mill. 3. The inorganic fine powder is an ultraviolet light scattering agent, and the inorganic fine powder dispersion composition is a cosmetic additive composition.
Or the production method described in 2. 4. The method according to claim 1, wherein the oily component is selected from hydrocarbons, animal and vegetable oils, synthetic triglycerides, synthetic esters and silicone oils. 5. The ester according to claim 1, wherein the ester is an ester of diglycerin, hexaglycerin, decaglycerin, sucrose, sorbitol or dextrin with a fatty acid.
The manufacturing method described. 6. An inorganic fine powder of 1.0 to 75.0% by weight, an oily component of 1.0 to 90.0% by weight and an ester of 0.0.
The production method according to claim 1 or 2, which comprises 1 to 20.0% by weight. 7. An inorganic fine powder dispersion composition produced by the method according to claim 1. 8. A cosmetic composition comprising the inorganic fine powder dispersion composition of claim 7.