JP3403336B2 - Composite powder and cosmetic containing it - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cosmetic composition which gives a natural and uniform finish, maintains a moist feeling, and has an excellent feeling in use, and a composite powder used therein.

[0002]

2. Description of the Related Art Powder-containing cosmetics such as lipsticks, foundations, nail enamel, makeup bases, and body powders usually have an inorganic white color such as titanium oxide or zinc oxide for the purpose of improving the appearance of the product and the brightness of the coating finish. Contains pigments. However, these inorganic white pigments tend to agglomerate in the blending system, resulting in uneven coating when applied to the skin, difficulty in uniform application, or unnatural whiteness of the appearance color against the appearance color. There was a point.

In order to improve this, conventionally, metal soap,
There are two methods: surface treatment of pigments with higher fatty acids, silica-alumina, siloxanes, fluoropolymers, amino acid derivatives, etc., and control of whiteness during coating with pigments whose surface is titanium oxide coated with a silica layer. It has been proposed (JP-A-63-44510). However, none of the methods achieved a sufficient improvement in the dispersibility of the pigment.

Further, an oil agent having a moisturizing property is used in order to give a moist feeling, but in the conventional powder-containing cosmetics, the moisturizing oil agent is lost from the skin over time,
Only solid components such as pigments and waxes or resins remain on the skin, and there is a drawback that moisturizing feeling is poor in persistence. Further, if the affinity between the moisturizing component and other components in the cosmetic is low, there is a problem that the blending amount of the moisturizing component is limited.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a cosmetic which gives a natural and uniform finish, maintains a moist feeling, and is excellent in usability.

[0006]

Means for Solving the Problems The present inventor has found that when a specific composite powder is blended, a natural and uniform finish is obtained, a moist feeling is maintained, and the cosmetic composition is excellent in the feeling of use and the effect of improving rough skin. It was found that

That is, the present invention provides a composite powder in which a highly oil-absorbing powder (B) containing an inorganic white pigment (A) is impregnated with an oil agent (C) having a moisturizing effect, and 0.1 to 50% by weight of the composite powder. % To provide a cosmetic composition.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The inorganic white pigment of component (A) is not particularly limited as long as it is one that is usually used in cosmetics, and titanium oxide, zinc oxide, aluminum oxide, barium sulfate, zirconium oxide, boron nitride are used. Etc. can be used in combination of one or more. The particle size is not particularly limited, but in view of dispersibility and transparency, the primary particle size in the composite powder is preferably 0.03 to 0.5 μm.

The highly oil-absorbing powder of the component (B) is, for example, Microbeads silica gel (manufactured by Fuji Davisson),
Silica such as Sunsphere (manufactured by Asahi Glass Co., Ltd.) and Tokseal (manufactured by Tokuyama Soda Co., Ltd.); Silicone resin such as trefil (manufactured by Toray); Polyamide resin including nylon such as SP-500 (manufactured by Toray); Techpolymer One or more kinds of polymethacrylate resins such as MBT (manufactured by Sekisui Kasei) and Microsphere (manufactured by Matsumoto Yushi Co., Ltd.) can be used in combination. The shape of the highly oil-absorbing powder is not particularly limited, but a spherical shape having a particle diameter of 0.5 to 50 μm is preferable.

Refractive index nD ²⁵ of the highly oil-absorbing powder of component (B)
Is preferably 1.4 to 2.0, and particularly preferably 1.4 to 1.8. Incidentally, the above-mentioned refractive index, the refractive index of the oil agent when the interface between the highly oil-absorbing powder and the oil agent becomes unclear under an optical microscope by impregnating the highly oil-absorbing powder into various oil agents of known refractive index. Can be the refractive index of the powder.

The oily agent having a moisturizing effect of the component (C) is not particularly limited as long as it is usually used in cosmetics, but those having a hydroxyl group in the molecule are preferable. Further, the component (C) preferably has a relative dielectric constant of 3.5 to 50, and particularly preferably 3.7 to 50.

Table 1 shows the results of measuring the relative permittivity of various oil agents with an LCR meter (AG4311B manufactured by Ando Electric Co., Ltd.).

[0013]

[Table 1]

Preferred examples of component (C) include isostearyl malate, diglyceryl diisostearate, diglyceryl triisostearate, glyceryl monomyristate monostearate, octyldodecyl lactate, 2-octyldodecanol, glycerin, 1,
Examples thereof include 3-butylene glycol, N-lauroyl-L-glutamic acid di (cholesteryl octyldodecyl), diglycerin isopalmitate sebacic acid condensate, and various amide derivatives disclosed in JP-A-8-319263.

The composite powder of the present invention is preferably spherical, particularly spherical with an average particle diameter of 0.5 to 50 μm, from the viewpoint of the feeling of use of cosmetics.

The composite powder composed of the components (A) and (B) can be prepared by a conventional method. For example, a method of immersing a highly oil-absorbing powder in a dispersion containing an inorganic white pigment or a solution that is a raw material of the inorganic white pigment, and then drying it, and applying the dispersion or solution to the surface of the highly oil-absorbing powder such as silica. And a method of dispersing an inorganic white pigment having an appropriate particle size in the raw material in the production step of highly oil-absorbing powder (US Pat. No. 4,132,560). As the titanium oxide-containing silica prepared by such a method, for example, Sunsphere ST3 (manufactured by Asahi Glass Co., Ltd.), S-IT (manufactured by Toray), etc. are commercially available, and as the titanium oxide-containing nylon, SP is used. -500IT (manufactured by Toray) is mentioned. The obtained powder can be further subjected to washing, treatment with an acidic / basic substance, oxidation / reduction treatment, firing, etc., if necessary.

As a method for impregnating the composite powder consisting of the components (A) and (B) with the oil agent of the component (C), there is a method of mixing with a Henschel mixer, a three-roll mill or the like. In order to impregnate the oil agent more effectively, the component (A)
It is preferable to use the composite powder consisting of (B) and (B) after being deaerated. The impregnated amount of the component (C) is preferably equal to or less than the oil absorption amount of the composite powder including the components (A) and (B).

The oil absorption of the composite powder composed of the components (A) and (B) is 30 to 3 by the measuring method according to JIS K5101 from the viewpoint of dispersibility of the composite powder in cosmetics and feeling of use.
00 ml / 100 g, more preferably 50-200 ml / 1
The amount is 00 g, more preferably 80 to 200 ml / 100 g.

The proportions of components (A), (B) and (C) are
By weight ratio (A) :( B) :( C) = 5 to 50: 100:
24-300, especially 10-40: 100: 24-100
Is preferred.

Further, the composite powder of the present invention is subjected to a commonly used surface treatment such as metal soap, higher fatty acid, surfactant, silica, alumina, titanium oxide, zirconia, silicon nitride, siloxane, polysiloxane and the like. Derivative,
Surface treatment with a fluoropolymer, an amino acid derivative, a protein such as fibroin, a resin, an acrylic polymer, a clay mineral, or the like can also be performed.

The compounding amount of the above composite powder in the cosmetic of the present invention is 0.1 to 50% by weight, especially 1 to 30% by weight based on the total composition.
Weight percent is preferred. If it is less than 0.1% by weight, a sufficient effect cannot be obtained, and if it exceeds 50% by weight, the usability is deteriorated.

In addition to the above-mentioned essential components, the cosmetic of the present invention contains solid fats and oils, semi-solid fats and oils, which are usually added to cosmetics.
Ingredients such as liquid oils and fats and pigments can be added.

Examples of the dosage form of the cosmetic of the present invention include emulsion, foundation, lipstick, lip balm, eye shadow, eyeliner, body powder, blusher and the like.

[0024]

The cosmetics containing the composite powder of the present invention are
It had a bright and vivid appearance color and coating color, had a natural and even finish, maintained a moist feeling, was excellent in usability, shape retention, stability over time, and was effective in improving rough skin. .

[0025]

EXAMPLES Next, the present invention will be further described with reference to examples.

Example 1 Lipsticks having the compositions shown in Tables 2 to 3 were produced by a conventional method, and the appearance color, coating color, finish, feeling of use, and rough skin improving effect were evaluated.

(Evaluation Method) Appearance Color: Ten professional panels visually evaluated the brightness of the appearance color of each lipstick, and evaluated according to the following criteria. ◎: Sufficiently bright and high saturation ○: Sufficiently bright but low saturation △: Insufficient brightness but high saturation ×: Insufficient brightness and vividness XX: Blank (inorganic white pigment component Equivalent to none)

Coating color: The brightness of the coating color of each lipstick was evaluated by 10 professional panels for actual use, and evaluated according to the following criteria. ◎: The same brightness and vividness as the appearance color is applied. ○: The applied color has the same brightness as the appearance color but lacks vividness. △: Both the appearance color and the applied color are dark ×: Compared with the appearance color The applied color is bright and lacks vividness XX: The applied color is extremely bright and lacking in vividness compared to the appearance color

Finishing: The naturalness of the finish of each lipstick was evaluated by 10 professional panels in actual use, and evaluated according to the following criteria. ◎: Highly effective to show the skin evenly with a natural finish ○: Effective to have a uniform look to the skin with a natural finish Δ: Naturally, but less effective to show the skin evenly ×: Applied compared to the appearance color The color is bright and lacks in naturalness XX: The applied color is extremely bright and lacks in naturalness compared to the appearance color

Feeling of use: A panel of 10 people sensory-evaluated the "non-uniformity of unevenness", "feeling of use", and "persistence of moistness" when actually using each lipstick, and the following criteria were used. evaluated. ⊚: 9 or more out of 10 evaluated as good ○: 7 to 8 evaluated as good Δ: 4 to 6 evaluated as good ×: 3 or less evaluated as good xx: No one evaluated as good There wasn't.

Improvement effect on rough skin: An artificial rough condition (acetone / ether treatment) was prepared on the upper arms of 10 people, and the sample was applied once a day for 2 days to measure the water retention of the skin by conductance measurement (Skin Surface Hydrometer: IBS). Made by SKICON
200) and the recovery rate from the rough condition was evaluated according to the following criteria. ◎: 90% or more recovery on average ○: 70% to 90% recovery on average Δ: 50% to 70% recovery on average ×: 30% to 50% recovery on average XX: 0 to 30% recovery on average

[0032]

[Table 2]

[0033]

[Table 3]

* 1: Polywax 655, manufactured by PETROLITE (mp: 99 ° C) * 2: HNP-9, manufactured by Nippon Seiro Co., Ltd. (mp: 75 ° C) * 3: CP-7, manufactured by PETROLITE (mp: 96 ° C) * 4: N-on silica containing titanium oxide (ST-3, manufactured by Asahi Glass Co., Ltd.)
Lauroyl-L-glutamate di (cholesteryl octyldodecyl) impregnated at a weight ratio of 1: 1 * 5: Titanium oxide-encapsulated nylon (SP-500IT, manufactured by Toray)
Impregnated with glycerin and 1,3-butylene glycol in a weight ratio of 3: 1: 1 * 6: * 10 to the silica containing zirconium oxide and glyceryl monomyristate monoglycinate in a weight ratio of 3: 2. * 7: Zinc oxide-containing polymethyl methacrylate obtained in * 11 was impregnated with diglyceryl diisostearate at a weight ratio of 1: 1 * 8: ST-3, manufactured by Asahi Glass Co., Ltd. (particle size 3 μm, Oil absorption 150ml / 10
0g, Refractive index of highly oil-absorbing powder nD ²⁵ : 1.48 (as interface refractive index) * 9: SP-500IT, manufactured by Toray Industries (particle size 5 μm, oil absorption 55 ml / 1
00g, Refractive index of highly oil-absorbing powder nD ²⁵ : 1.48 (as interface refractive index) * 10: Porous silica (Sunsphere H-31, manufactured by Asahi Glass Co., Ltd.,
Refractive index nD ²⁵ : 1.48) was impregnated with 10% zirconium nitrate aqueous solution, dried at 100 ° C, and calcined in air stream at 550 ° C for 6 hours (particle size 3μm, oil absorption 120ml / 10ml).
0g) * 11: An aqueous dispersion containing 20% of zinc oxide and 2% of a nonionic dispersant was treated with a sand mill for 6 hours, and the resulting slurry was added to Matsumoto Yushi Co., Ltd. Microsphere-M (refractive index nD ²⁵ : 1.4).
8) Impregnated and dried at 80 ° C (particle size 5μm, oil absorption 80ml / 100g) * 12: CR-50, Ishihara Sangyo Co., Ltd. (particle size 0.25μm, oil absorption 18m)
l / 100g) * 13: Titanium oxide-encapsulated silica (ST-3, manufactured by Asahi Glass Co., Ltd.) impregnated with polyisobutene at a weight ratio of 1: 1 * 14: Sunsphere H-31 manufactured by Asahi Glass Co., Ltd. (particle size 3 μm, oil absorption) 150 ml / 100 g) impregnated with N-lauroyl-L-glutamate di (cholesteryl octyldodecyl) in a weight ratio of 1: 1.

Example 2 W / O type emulsions having the compositions shown in Tables 4 to 5 were produced by a conventional method, and the finish, the feeling of use and the effect of improving rough skin were evaluated in the same manner as in Example 1.

[0036]

[Table 4]

[0037]

[Table 5]

Example 3 W / O type foundations having the compositions shown in Tables 6 to 7 were produced by a conventional method, and the appearance color, coating color, finish, feeling of use and rough skin improving effect were evaluated in the same manner as in Example 1. . Further, the visibility of pores and the stability with time were evaluated by the following methods. Poor visibility: 10 expert panels performed sensory evaluation on the poor visibility of pores when actually using each foundation, and evaluated according to the following criteria. ◎: 8 or more out of 10 were difficult to see ○: 6 to 7 out of 10 were difficult to see △: 4 to 5 out of 10 were difficult to see ×: 3 out of 10 were poor Stability over time when evaluated to be difficult to see: The stability of each foundation after the passage of time was visually evaluated and evaluated according to the following criteria. ○: Stable for 1 year or more at storage temperature of -5 ° C to 50 ° C △: Stable for half a year or more at storage temperature of -5 ° C to 50 ° C ×: Separated within half a year at storage temperature of -5 ° C to 50 ° C

[0039]

[Table 6]

[0040]

[Table 7]

Example 4 Body powders having the compositions shown in Tables 8 to 9 were produced by a conventional method, and the finish, the feeling of use and the effect of improving rough skin were evaluated in the same manner as in Example 1.

[0042]

[Table 8]

[0043]

[Table 9]

Continuation of the front page (56) Reference JP-A-10-45535 (JP, A) JP-A-9-169626 (JP, A) JP-A-9-30935 (JP, A) (58) Fields investigated (Int .Cl. ⁷ , DB name) A61K ^7/ 00-7/035

Claims (4)

(57) [Claims] 1. A composite powder comprising a highly oil-absorbing powder (B) containing an inorganic white pigment (A) impregnated with an oil agent (C) having a moisturizing effect. 2. The composite powder according to claim 1, wherein the highly oil-absorbing powder (B) containing the inorganic white pigment (A) has an oil absorption of 50 to 200 mL / 100 g. 3. The weight ratio of components (A), (B) and (C) is (A) :( B) :( C) = 5 to 50: 100: 24.
The composite powder according to claim 1 or 2, wherein 4. A cosmetic comprising the composite powder according to claim 1 in an amount of 0.1 to 50% by weight.