JPH10251125A - Cosmetic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cosmetic free from interaction with water-soluble polymers, having excellent dispersibility, stably keeping the viscosity of the system with time and exhibiting excellent stability by using specific titanium oxide powder. SOLUTION: This cosmetic contains (A) titanium oxide powder having a primary particle diameter of 0.1-1.4μm and a span defined by the formula (D90-D10)/D50 (D90, D10 and D50 are particle diameters corresponding to the cumulative value of particle size distribution of 90, 10% and 50%, respectively)} of <=2, (B) an aqueous component and (C) a water-soluble polymer. The component C is preferably an ionic water-soluble polymer such as carrageenan. The preferable amounts of the components A, B and C are 0.1-60wt.%, 1-99wt.% and 0.0010-20wt.%, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to cosmetics, and more particularly, to cosmetics having specific particle sizes,
The present invention relates to a stable cosmetic composition having good dispersibility and no increase in viscosity by blending a titanium oxide powder having a narrow particle size distribution, a water-soluble polymer and an aqueous component.

[0002]

2. Description of the Related Art Conventionally, titanium oxide has been incorporated into cosmetics as a white pigment or as an ultraviolet ray blocking agent. Particles having a particle size of 0.2 to 1 μm are used as titanium oxide to be mixed with the cosmetic, and the maximum particle size is 0.1 μm or less, and the average particle size is 30 to 40 m.
It is also known to mix micron particles (Japanese Patent Publication No. 47
-42502). In addition, utilizing the property of water-soluble polymer to dissolve or disperse / swell in water, emulsification stabilizer and powder sedimentation inhibitor of water-soluble polymer in cosmetics, feel control agent,
Conventionally, it is blended as a film forming agent, a viscosity imparting agent, and the like. For example, in liquid foundations and the like which are liquid or emulsion liquid cosmetics, water-soluble polymers are used for the purpose of stabilizing emulsions and preventing sedimentation of powders.

[0003]

However, when a titanium oxide powder is blended with a cosmetic containing a water-soluble polymer, the titanium oxide powder aggregates due to the interaction between the water-soluble polymer and titanium oxide. The dispersibility deteriorates and the viscosity of the system increases. Thus, when the dispersibility is deteriorated or the viscosity of the system is increased, there is a problem in that when applied to the skin, spreading and spreading are deteriorated, which impairs usability. The present invention provides a cosmetic composition comprising a titanium oxide powder and a water-soluble polymer, with good powder dispersibility.
An object of the present invention is to provide a cosmetic composition which does not increase the viscosity of the system and has excellent stability.

[0004]

Means for Solving the Problems In view of the above circumstances, the present inventors have conducted intensive studies on cosmetics containing a titanium oxide powder and a water-soluble polymer, and as a result, have found that a specific titanium oxide powder is used. As a result, the present inventors have found that a stable cosmetic having good dispersibility and exhibiting no interaction with a water-soluble polymer can be obtained, thereby completing the present invention. That is, according to the present invention, (A) the primary particle size is 0.1 to 14 μm, and (D90−D10) / D50 [where D90, D10 and D50 each have an integrated value of particle size distribution of 90%, 10%,
% And a particle size corresponding to 50%. A titanium oxide powder having a span of 2 or less, (B) an aqueous component,
And (C) a cosmetic comprising a water-soluble polymer. Hereinafter, the present invention will be described in detail.

The component (A) used in the present invention is a titanium oxide powder having a primary particle size of 0.1 to 14 μm and a specific particle size distribution described later. Here, the primary particle size refers to a BET diameter calculated from the BET specific surface area by the following formula, assuming that the particles are spherical. The BET specific surface area is measured using a flow soap.

[0006]

(Equation 1)

The primary particle size of the titanium oxide powder used in the present invention is 0.1 to 14 μm, more preferably,
0.4 to 10 μm. When the primary particle size exceeds 14 μm, adhesion to the skin is reduced, and the feeling upon use becomes poor. On the other hand, if the primary particle size is less than 0.1 μm, the cohesive strength is increased, and the dispersibility is deteriorated.

Further, the titanium oxide powder of the component (A) used in the present invention is a specific one having a narrow particle size distribution.
A span defined by the following equation is used as an index indicating the particle size distribution. Span = (D90-D10) / D50 Here, D90, D10, and D50 are particle diameters corresponding to an integrated value of the particle size distribution of 90%, 10%, and 50%, respectively. The particle size distribution can be measured using a Sedigraph (manufactured by Micromeritics).

The method for producing the titanium oxide powder having a narrow particle size distribution used in the present invention is not necessarily limited. For example, it can be obtained by a method of firing titanium oxide or a titanium oxide precursor in an atmosphere gas containing hydrogen chloride gas described in JP-A-7-187613. Further, the titanium oxide crystal produced by using the flux method can be pulverized and classified to prepare the crystal. Furthermore, it can also be prepared by pulverizing titanium oxide powder with a dry ball mill, a wet ball mill, a vibration mill, a roll mill, a jet mill, or the like, and then classifying it. In order to prepare a titanium oxide powder having a specific particle size and a narrow particle size distribution by classification, the titanium oxide powder is prepared by using a vibrating sieve such as a gyro shifter or a hammer screen, a spiral classifier or a hydraulic classifier. Such a wet classification method, a dry classifier method such as a dynamic or centrifugal air classifier, or one or a combination of two or more well-known classification processes such as a flotation method are used.

The titanium oxide of the component (A) (hereinafter also referred to as “single-crystal titanium oxide”) may be blended as it is, or may be prepared by a known method for the purpose of improving adhesion and dispersibility to skin. It may be surface-treated or compounded with another powder. The amount is not particularly limited, but is preferably 0.1 to 60% by weight, more preferably 1 to 60% by weight.
-40% by weight, more preferably 2-30% by weight.

The aqueous component of component (B) used in the present invention includes purified water, aqueous plant extract, natural water such as seawater, and the like.
Examples include polyhydric alcohols such as glycerin, 1,3-butylene glycol, and propylene glycol. The amount of the component (B) used in the present invention is not particularly limited, but is preferably 1 to 99% by weight, more preferably 2 to 99% by weight.
~ 90% by weight.

The water-soluble polymer of the component (C) used in the present invention is generally used in the field of cosmetics and is safe for the human body. For example, guar gum, locust bean gum, gum arabic, mannan, carrageenan, galactan, tragacanth, plant-based water-soluble polymers such as pectin, xanthan gum, dextrin, succinoglucan, microbial water-soluble polymers such as curdlan, Animal-based water-soluble polymers such as gelatin, casein, albumin, and collagen; cellulose-based semi-synthetic polymers such as methylcellulose, ethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, carboxymethylcellulose, methylhydroxypropylcellulose, and cationized cellulose; starch , Carboxymethyl starch, methyl starch, starch semi-synthetic water-soluble polymers such as cationized starch, alginate, alginic acid such as propylene glycol alginate Semisynthetic water-soluble polymers, polyvinyl alcohol, polyvinyl pyrrolidone, polyvinyl methyl ether, carboxyvinyl polymer, polyacrylic acid salts, synthetic water-soluble polymers such as alkyl addition carboxyvinyl polymer and the like.

Among the above water-soluble polymers, ionic water-soluble polymers such as carrageenan, xanthan gum, cationized cellulose, cationized starch, alginates, carboxyvinyl polymers, polyacrylates and alkyl-added carboxyvinyl polymers are particularly preferred. Is preferred. The ionic water-soluble polymer may be cationic or anionic. By using these ionic water-soluble polymers, the dispersibility of the titanium oxide particles is further improved, and the effect of stabilizing the emulsion and preventing the sedimentation of the powder becomes more remarkable. The amount of the component (C) used in the present invention is not particularly limited, but is preferably 0.001 to 2
0 wt%, more preferably 0.01 to 10 wt%.

The cosmetics of the present invention include skin care cosmetics such as lotions, emulsions, creams, packs, sunscreens, massages, facial cleansers, etc., hair care cosmetics such as shampoos and rinses, foundations, foundations, lipsticks and eyes. liner,
Any of makeup cosmetics such as nail polish may be used, and dosage forms include aqueous liquid, solid, multilayer, water-in-oil emulsion, oil-in-water emulsion, W / O / W emulsion, Any of a solubilized state and the like may be used.

[0015] In addition to the above essential components, components commonly used in cosmetics can be appropriately added to the cosmetic of the present invention as needed. As the powder, for example, talc,
Inorganic pigments such as kaolin, sericite, mica, magnesium carbonate, calcium carbonate, aluminum silicate, magnesium silicate, aluminum magnesium silicate, calcium silicate, and silicic anhydride; titanium oxide and zinc oxide outside the above ranges Inorganic white pigment, red iron,
Inorganic color pigments such as yellow iron oxide, black iron oxide, gunjou, konjo, carbon black, etc .; pearlescent agents such as titanium mica, iron oxide mica titanium, bismuth oxychloride; organic coloring pigments such as tar pigments and natural pigments; nylon powder And organic powders such as silicone resin powder, silk powder, polystyrene, polyethylene powder, crystalline cellulose, and N-acyl lysine. Note that these powders may be subjected to a surface treatment using a fluorine compound, a silicone compound, a metal soap, a wax, an oil, a hydrocarbon, or the like, or may be a compound obtained by combining one or more kinds. .

[0016] The oil component appropriately compounded as required
For example, oils and fats such as olive oil, castor oil, jojoba oil, mink oil, waxes such as beeswax, lanolin, candelilla wax, liquid paraffin, squalane, petrolatum, paraffin wax, hydrocarbons such as microcrystalline wax, stearic acid, olein Fatty acids such as acids, higher alcohols such as cetanol, stearyl alcohol, and behenyl alcohol; esters such as isopropyl myristate, glyceryl trioctanoate, and diglyceryl triisostearate; lanolin fatty acid isopropyl; lanolin derivatives such as lanolin alcohol; dimethylpolysiloxane; methyl Silicone oil such as phenylpolysiloxane, polyoxyalkylene-modified or alkyl-modified silicone oil, and fluorine-based oils such as perfluorodecane and perfluorooctane It can be mentioned. Other examples include organic solvents, resins, plasticizers, ultraviolet absorbers, antioxidants, preservatives, surfactants, humectants, fragrances, alcohols, thickeners, and cosmetic ingredients.

[0017]

EXAMPLES The present invention will be further described with reference to the following examples, but the present invention is not limited thereto. Production Example 1 Single-crystal titanium oxide A powder obtained by adding titanium oxide powder (trade name: CR-EL, manufactured by Ishihara Sangyo Co., Ltd.) to metatitanic acid (manufactured by Titanium Industry Co., Ltd.) and using the powder as a raw material was used. This raw material was fired at 1,000 ° C. for 2 hours in an atmosphere gas containing 30% by volume of hydrogen chloride gas and 70% by volume of nitrogen gas. The BET specific surface area of the single crystal titanium oxide thus obtained is 2.4 m ² / g, and the BET
The diameter was 0.59 μm. Particle size D90, D1 determined from Cedigraph (manufactured by Micromeritics)
0 and D50 were 1.3 μm, 0.5 μm and 0.8 μm, respectively, and the span was 1.0.

Examples 1 to 6 and Comparative Examples 1 and 2 Emulsion foundation (O / W) Emulsion foundations having the compositions shown in Table 1 below were prepared.
Usability (expansion), pigment dispersibility, and stability over time were evaluated.

[0019]

[Table 1]

(Production method) A: Components 1 to 8 are mixed and dispersed. B: Components 9 to 13 are mixed by heating. C: After mixing components 14 to 19 and 21, add A to the mixture, uniformly disperse, and heat. D: Add C to B and emulsify and mix. E: D was cooled, and component 20 was added and mixed to obtain an emulsified foundation (O / W).

(Evaluation method) Usability A use test was conducted on the spread of skin when applied to the skin by 40 female panels with a makeup history of 10 years or more. Based on the number of people judged to be good, evaluation was made according to the following criteria. [Evaluation] [Number judged good] 良 い: 35 or more ：: 25 to 34 △: 15 to 24 ×: Less than 15

2. Pigment dispersibility The produced emulsion foundation was observed with a microscope, and the dispersion state of the pigment was evaluated based on the following criteria. [Evaluation] [Content] A: Very good. ：: good. Δ: Aggregates of pigments are mixed. ×: The pigment is clearly aggregated.

3. Stability over time The manufactured emulsified foundation was stored in a thermostat at 50 ° C., and the viscosity change after one month was visually observed, and the dispersion state of the pigment was observed with a microscope, and evaluated according to the following criteria. [Evaluation] [Content] A: No change. ：: almost no change. Δ: Viscosity increase and / or pigment aggregation tendency is observed. X: Viscosity increase and / or pigment aggregation are remarkable. The results obtained by the above evaluation method are also shown in Table 1.

As is clear from the results shown in Table 1, in Examples 1 to 6 according to the present invention, the feeling of use (spreading) at the time of coating was obtained.
An emulsified foundation having good pigment dispersibility and excellent stability over time.

Example 7 Sunscreen Emulsion (O / W) (Components) (%) Stearic acid 2.5 2. Cetanol 1.5 3. Glyceryl trioctanoate 5.0 4.0 Dimethylpolysiloxane 5.0 5. 5. Polyoxyethylene (20) monooleate 2.0 Octyl methoxycinnamate 7.0 7. Oxybenzone 0.58. 8. Single crystal titanium oxide (Production Example 1) 8.0 Propylene glycol 8.010. Triethanolamine 1.5 11. 11. Alkyl-modified carboxyvinyl polymer 0.3 Preservative 0.1 13. Fragrance 0.05 14. Purified water 58.6

(Production method) A: Components 1 to 7 are dissolved by heating. B: Components 8 to 12 and 14 are uniformly mixed and dispersed, and heated. C: B is added to A and emulsified and mixed. D: C was cooled, and component 13 was added and mixed to obtain a sunscreen emulsion (O / W). Example 7 was a sunscreen emulsion having good spreadability, uniform dispersion of the pigment, no application unevenness, and excellent stability over time.

Example 8 Emulsion Foundation (W / O) (Component) (%) 1. Single crystal titanium oxide (Production Example 1) 20.0 Bengara 2.0 3. 3. Yellow iron oxide 4.0 Black iron oxide 0.85. Octamethylcyclotetrasiloxane 20.0 6. 6. Polyether-modified silicone 5.0 Trimethylsiloxysilicic acid 5.0 8. Dimethylpolysiloxane 10.0 9. Cetyl isooctanoate 5.010. Glycerin 5.0 11. Carboxyvinyl polymer 0.3 12. Sodium hydroxide 0.1 13. Preservative 0.1 14. Perfume 0.05 15. Purified water 22.65

(Production method) A: Components 1 to 9 are uniformly mixed and dispersed, and heated. B: Components 10 to 13 and 15 are uniformly mixed and heated. C: B is added to A and emulsified and mixed. D: C was cooled, and component 14 was added and mixed to obtain an emulsified foundation (W / O). Example 8 was an emulsified foundation that was easy to spread on the skin, had no uniform gap between appearance color and tint color because the pigment was uniformly dispersed, and had little change even after long-term storage.

Example 9 Base Cream (O / W) (Components) (%) Stearic acid 2.0 2. Cetanol 1.0 3. Glycerin monostearate 1.0 4. Squalane 5.0 5. Glyceryl trioctanoate 3.0 6. Decamethylcyclopentasiloxane 5.0 7. 7. Trimethylsiloxysilicic acid 3.0 Single crystal titanium oxide 3.0 9. Sodium polyacrylate 0.5 10. Xanthan gum 0.2 11. Sodium hydroxide 0.2 12.1,3-butylene glycol 5.0 13. Preservative 0.1 14. Perfume 0.03 15. Purified water 70.97

(Production method) A: Components 1 to 8 are uniformly mixed and dispersed, and heated. B: Components 9 to 13 and 15 are uniformly mixed and heated. C: B is added to A and emulsified and mixed. D: C was cooled, and component 14 was added and mixed to obtain a base cream (O / W). Example 9 was a base cream having good spreadability, good pigment dispersibility, and excellent stability over time.

[0031]

The cosmetic composition of the present invention comprises a single crystal titanium oxide having a specific particle size and particle size distribution, an aqueous component and a water-soluble polymer, whereby the titanium oxide and the water-soluble polymer are mixed. Aggregation of titanium oxide due to action is reduced, dispersibility is improved, excellent usability, there is no increase in viscosity,
It has excellent stability over time.

 ──────────────────────────────────────────────────の Continuing on the front page (72) Kunio Saegusa, No. 6, Kitahara, Tsukuba, Ibaraki Prefecture, Tsukuba Research Laboratory, Sumitomo Chemical Co., Ltd.

Claims (3)

[Claims] (A) A primary particle size is 0.1 to 14 μm and (D90−D10) / D50 [where D90,
D10 and D50 each have an integrated value of the particle size distribution of 90.
%, 10% and 50%. ] A cosmetic comprising: a titanium oxide powder having a span of 2 or less, (B) an aqueous component, and (C) a water-soluble polymer. 2. The component (A) has a primary particle size of 0.4 to 10 μm.
2. The cosmetic according to claim 1, wherein m. 3. The cosmetic according to claim 1, wherein the component (C) is an ionic water-soluble polymer.