JP4672412B2 - Oily cosmetics for lips - Google Patents

Description

  The present invention relates to an oily cosmetic for lips that makes lips wrinkles inconspicuous when applied to lips.

Oily cosmetics for lips such as lipsticks are used to impart color and gloss to lips, but are also required to have an effect of making lip wrinkles that become noticeable with aging inconspicuous. As a method for making skin wrinkles and irregularities inconspicuous, a method based on the light diffusion effect of inorganic powder (see Non-Patent Document 1, Patent Documents 1 and 2), etc. is disclosed. A transparent inorganic powder such as a fine powder is used.
By the way, lip wrinkles are deeper and wider than skin wrinkles and pores, and because they are darker in color, powders that are effective in hiding skin wrinkles and pores are blended into oily cosmetics for lips. Even so, the fact that the effect of concealing the wrinkles of the lips was hardly expressed was the actual situation.

Therefore, as a method of making lip wrinkles inconspicuous, a method of blending a silicone elastomer (see Patent Document 3), a method of blending iron oxide-coated mica titanium having a specific interference color and appearance color (see Patent Document 4), etc. However, in the former case, a dry feeling peculiar to a silicone resin is likely to occur, and in the latter case, the brown appearance color derived from iron oxide has a problem of unnatural finish.
In view of the above, there has been a demand for a lip cosmetic that has high moisturizing performance and that naturally and effectively hides wrinkles on the lips.

Fragrance Journal, 1992-9, p78 JP 2004-26656 A JP 2003-171231 A JP 2003-2814 A JP 2001-288039 A

  An object of the present invention is to provide an oily cosmetic for lips that makes lips wrinkles inconspicuous, and further provides an oily cosmetic for lips with high moisturizing performance.

The present inventors have shown that when using particles obtained by coating titanium oxide having a specific particle diameter with a layer having a specific refractive index, the effect of making the lip wrinkles inconspicuous is manifested. I found it.
That is, in the present invention, particles formed by coating titanium oxide having an average particle diameter of 50 to 120 nm with a layer having a refractive index of 1.45 to 1.50 may be crosslinked with alkyl (meth) acrylate (co-polymer). ) An oily cosmetic composition for lips characterized by containing spherical or substantially spherical secondary particles having an average particle diameter of 1 to 5 μm, which are interspersed in a resin matrix formed from a polymer. It is.

  According to the present invention, it is possible to obtain an oily cosmetic for lips that effectively makes lip wrinkles inconspicuous.

  The titanium oxide used in the present invention has an average particle size of 50 to 120 nm. When the average particle size of titanium oxide is in this range, the effect of concealing the wrinkles of the lips due to the diffusion of light is obtained, and the finish when applied to the lips does not become unnaturally pale or white. . From these points, the average particle diameter of titanium oxide is preferably 80 to 100 nm. The particle diameter of titanium oxide can be confirmed by a TEM photograph.

  The particles used in the present invention are obtained by coating titanium oxide with a layer having a refractive index of 1.45 to 1.50 (hereinafter, these particles are referred to as “primary particles”). As a material for forming this coating layer, amorphous silica, alumina, silica alumina (silicon aluminum composite oxide) and the like are preferable, and amorphous silica is particularly preferable. The ratio of the coating layer to titanium oxide is preferably a coating layer / primary particle = 0.05 to 0.5 in terms of mass ratio in order to obtain the effect of making lip wrinkles less noticeable and to uniformly coat titanium oxide. 0.2 to 0.4 is more preferable.

Conventional methods such as precipitation, sol-gel, and CVD (chemical vapor deposition) are used to coat the layer with titanium oxide. Various types of titanium oxide coated with silica are commercially available, and they can also be used. For example, Maxlite TS-01 (trade name, average particle size 110 nm) sold by Showa Denko Co., Ltd. has an average particle size of titanium oxide of 90 nm, a silica coating layer of 33% by mass, and particles of titanium oxide. A diameter and a coating layer of silica are preferable, and can be suitably used.
The primary particles used in the present invention are preferably those whose surfaces have been subjected to water repellent treatment. By performing the water repellent treatment, the surface of the silica-coated titanium oxide becomes hydrophobic, so that dispersibility is improved. Examples of the water-repellent treatment agent used for the water-repellent treatment include silicone oil, fatty acid metal salt, alkyl phosphoric acid, alkali metal salt or amine salt of alkyl phosphoric acid, N-mono long chain (carbon number 8 to 22) aliphatic acyl base Amino acids and fluorine compounds having a perfluoroalkyl group. 0.05-20 mass% is preferable and, as for the processing amount of the water-repellent processing agent with respect to a silica coating titanium oxide, 1.0-10 mass% is more preferable.

  The primary particles used in the present invention can be scattered in the resin matrix. More specifically, the primary particles are scattered in the resin matrix to form spherical or substantially spherical secondary particles. The resin forming the resin matrix is preferably a resin having a refractive index of 1.50 to 1.60 from the viewpoint of being less turbid and having the effect of making the lips wrinkle inconspicuous. Examples of the resin forming the resin matrix include alkyl (meth) acrylate (including cross-linked type) (co) polymer, polycarbonate, acrylonitrile / styrene (co) polymer, polystyrene (co) polymer, among them. An alkyl methacrylate (including cross-linked type) (co) polymer having an alkyl group having 2 to 22 carbon atoms is preferred from the viewpoint of heat resistance. As alkyl methacrylate (including cross-linked type) (co) polymers, polymers of 2-ethylhexyl (meth) acrylate, lauryl (meth) acrylate, cetyl (meth) acrylate, stearyl (meth) acrylate, behenyl (meth) acrylate And cross-linked copolymers of these with ethylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, and polypropylene glycol di (meth) acrylate, and in particular, the cross-linked type of lauryl methacrylate and ethylene glycol dimethacrylate. A copolymer is preferred. By covering with these cross-linked resins, the dispersibility of the primary particles in the oily cosmetic for lips is improved. The ratio of the resin matrix to titanium oxide is preferably a mass ratio of resin matrix / primary particles = 1.5 to 5, more preferably 2.5 to 4.2, in order to obtain an effect of making lip wrinkles less noticeable. .

Usually, a plurality of titanium oxide particles are present in spherical or substantially spherical particles (secondary particles) in which primary particles are scattered in a resin matrix. The average particle diameter of the spherical or substantially spherical particles is preferably 1 to 5 μm, more preferably 2 to 4 μm, from the viewpoint of easy entry into the lip wrinkles.
Here, the average particle diameter indicates a volume average particle diameter (D4) (average particle diameter calculated by volume fraction), and can be easily measured with a laser diffraction particle size distribution meter with good reproducibility. The same applies to the measurement of the average particle size of the titanium oxide and the average particle size of the secondary particles.
In oily cosmetics for lips, it is usually applied directly from the stick to the lips or using a red brush. Therefore, it is hard to wrinkle when compared with foundations and funnels that are applied with a high share using sponges and fingers. Therefore, the particle shape of the secondary particles is preferably spherical or substantially spherical.

As a method for dispersing the primary particles in the resin matrix, suspension polymerization is preferable because spherical or substantially spherical secondary particles having a uniform particle diameter can be obtained. For example, a resin matrix made of the alkyl methacrylate crosslinked (co) polymer can be formed by the method described in JP-A No. 2003-192538.
From the viewpoint of feeling when the oily cosmetic composition for lips of the present invention is applied to the lips and the effect of making wrinkles inconspicuous, the primary particles or secondary particles are 0.1 to 0.1% in the oily cosmetic composition for lips. It is preferable to make it contain 20 mass%, More preferably, it is 0.5-10 mass%.

  The oily cosmetic composition for lips of the present invention can contain an oily component (nonvolatile oil) that is liquid at 25 ° C. Examples of such oily components include hydrocarbon oils such as liquid paraffin, heavy liquid isoparaffin, squalane; isotridecyl isononanoate, glyceryl dimyristate, glyceryl diisostearate, myristate / glyceryl isostearate, neopentyl glycol dicaprate, Esters and triglycerides such as diisostearyl malate, octyldodecyl myristate, castor oil, macadamian nut oil, jojoba oil; silicone oils such as dimethylpolysiloxane, methylphenylpolysiloxane, dimethylcyclopolysiloxane; perfluoropolyether Fluorine oil etc. can be used. Of these, hydrocarbon oils, particularly heavy liquid isoparaffins, are particularly preferred for enhancing the effect of making wrinkles less noticeable.

In the oily cosmetic composition for lips of the present invention, the ratio of the oil component to the secondary particles is preferably a mass ratio of oil component / secondary particles = 1 to 100, more preferably 10 to 30. The content of the oily component is preferably 10 to 80% by mass, more preferably 30 to 70% by mass in the oily cosmetic for lips from the point of feel during use.
In addition, the combined use of cyclic dimethylpolysiloxane, low molecular weight dimethylpolysiloxane, isopropane, or water, which is a volatile oil agent, and the above secondary particles hinders the effect of making wrinkles inconspicuous. It is preferable to avoid the combined use.

The oily cosmetic composition for lips of the present invention can be made solid by blending a solid or semi-solid oily component or oil gelling agent at 25 ° C. in addition to the oily component. Examples of solid or semi-solid oily components or oil gelling agents at 25 ° C. include hydrocarbon waxes such as solid paraffin, ceresin, microcrystalline wax, low molecular polyethylene, low molecular polyolefin, petrolatum; lanolin, beeswax, carnauba Natural waxes such as wax, candelilla wax and lanolin; long chain fatty acids such as stearic acid and behenic acid; higher alcohols such as stearyl alcohol and behenyl alcohol; fatty acid cholesteryl, fatty acid phytostearyl, hydrogenated castor oil, 12-hydroxystearic acid Synthetic and modified waxes such as sucrose fatty acid ester and dextrin fatty acid ester; alkyl phosphates such as aluminum dialkyl lulate and aluminum distearate.
The content of the oily component or oil gelling agent that is solid or semi-solid at 25 ° C. is preferably 0.1 to 30% by mass, more preferably in the oily cosmetic composition for lips of the present invention from the point of touch during use. 5 to 25% by mass.

The oily cosmetic composition for lips of the present invention preferably contains a lake pigment in order to enhance the effect of suppressing the occurrence of dullness and making the lips wrinkles inconspicuous. When yellow No. 4 Al lake and yellow No. 5 Al lake are used as lake pigments, the above effect is high. In the oily cosmetic composition for lips, the ratio of the lake pigment to the secondary particles is preferably a lake pigment / secondary particle = 0.03 to 3, more preferably 0.08 to 1 in terms of mass ratio in order to enhance the above effect. preferable.
Furthermore, in this invention, the pigment and dye normally used for the oily cosmetics for lips can be mix | blended other than the said lake pigment. Specific examples of pigments and dyes include tar pigments and dyes such as red 201, red 202, red 226, and blue 1; natural pigments such as cochineal and safflower; carbon black, manganese violet, titanium oxide, Inorganic pigments such as iron oxide (red, yellow, black), ultramarine, and bitumen; extender pigments such as talc, sericite, mica, kaolin, anhydrous silicic acid, calcium carbonate, magnesium carbonate; and further coated with titanium oxide or iron oxide Examples include mica, synthetic phlogopite, and pearl pigments such as glass powder. These pigments are contained for the purpose of coloring the lip oily cosmetic, improving the feeling of use, and controlling the concealment. These pigments may be surface-coated by a known method with a fluorine compound, silicone oil, metal soap, oil or fat, wax, hydrocarbon compound or the like according to the purpose. The content of these pigments in the oily lip cosmetic is usually about 1 to 30% by mass, preferably 2 to 20% by mass.

Moreover, in addition to the said component, surfactant, antioxidant, a fragrance | flavor, a ultraviolet absorber, a moisturizer etc. can be suitably contained in the oily cosmetic for lips of this invention.
Although it does not specifically limit about the form of the oily cosmetics for lips of this invention, When making it stick shape, it mixes until it becomes uniform all components using a roll mill (disperser), for example, and this is heat-dissolved in a metal mold | die. It can be manufactured by pouring and cooling and solidifying.

Production Example 1
A beaker having a volume of 300 mL was charged with 56 g of lauryl methacrylate, 19 g of ethylene glycol dimethacrylate and 1.5 g of lauroyl peroxide to obtain a solution. Further, silica-coated titanium oxide having an average particle size of 110 nm (average particle size of titanium oxide 90 nm, silica coating) An amount of 33% by mass, manufactured by Showa Denko KK, trade name: Maxlite TS-01) was subjected to a water repellent treatment using 2% by mass of methylhydrogenpolysiloxane based on silica-coated titanium oxide. Next, the above solution and 40 g of silica-coated titanium oxide were mixed to disperse the silica-coated titanium oxide. Thereafter, this dispersion was added to 750 g of a 1% by weight polyvinyl alcohol aqueous solution and sufficiently dispersed using an ultrasonic disperser to obtain a dispersion in which particles having an average particle diameter of 3.2 μm were dispersed. Subsequently, the obtained dispersion was charged into a separable flask having a volume of 1000 mL, and after substitution with nitrogen, polymerization was performed at 75 ° C. for 8 hours while stirring at a rotation speed of 250 rpm. The obtained solid was washed with water and dried to obtain 110 g of spherical particles (secondary particles). The spherical particles had an average particle size of 2.8 μm, a silica-coated titanium oxide content of 30% by mass, and a resin matrix / primary particle (mass ratio) of 2.3.

Comparative production example 1
In Production Example 1, silica-coated titanium oxide was made of silica-coated titanium oxide having an average particle size of 38 nm (average particle size of titanium oxide 30 nm, silica coating amount 33 mass%, manufactured by Showa Denko KK, trade name: Maxlite TS-04 120 g of spherical particles were obtained by the same method as in Production Example 1, except that The spherical particles had an average particle size of 3.0 μm, a silica-coated titanium oxide content of 30% by mass, and a resin matrix / primary particle (mass ratio) of 2.3.

Comparative production example 2
110 g of spherical particles were obtained by the same method as in Production Example 1 except that the silica-coated titanium oxide was changed to titanium oxide having an average particle size of 250 nm (made by Ishihara Sangyo Co., Ltd., trade name: CR50) in Production Example 1. It was. The spherical particles had an average particle diameter of 4.2 μm, a titanium oxide content of 30% by mass, and a resin matrix / primary particle (mass ratio) = 2.3.

Examples 1 to 3 and Comparative Examples 1 and 2
In Examples 1 and 3 and Comparative Examples 1 and 2, the spherical particles obtained by the above method were used. In Example 2, silica-coated titanium oxide having an average particle diameter of 90 nm and a silica coating amount of 33% by mass ( A stick-shaped lipstick having the composition shown in Table 1 was manufactured using Showa Denko K.K., trade name: Maxlite TS-01, and the lipstick wrinkle was not noticeable and the finish was natural. Evaluated. The results are also shown in Table 1.
(Manufacturing method)
Each component was mixed with a roll mill, heated and melted at 90 ° C., stirred with a homomixer, and after confirming that the pigment and powder were uniformly dispersed, defoamed and poured into an aluminum mold. The stick-shaped lipstick was obtained by cooling to 10.

(Evaluation methods)
Twenty female panelists in their 30s used lipsticks and examined the number of people who answered that “lip wrinkles were not noticeable” and the number of people who answered that “they did not look unnatural”. "Evaluation of bitterness" and "evaluation of finish".

  The oily cosmetic for lips of the present invention effectively makes lip wrinkles inconspicuous.

Claims (4)

Particles formed by coating titanium oxide having an average particle diameter of 50 to 120 nm with a layer having a refractive index of 1.45 to 1.50 are formed from an alkyl (meth) acrylate (co) polymer which may be crosslinked. An oily cosmetic for lips characterized by containing spherical or substantially spherical secondary particles having an average particle diameter of 1 to 5 μm, which are scattered in a resin matrix . The oily cosmetic for lips according to claim 1, wherein the layer covering titanium oxide is formed of silica. The oily cosmetic for lips according to claim 1 or 2, wherein the alkyl (meth) acrylate (co) polymer has an alkyl group having 2 to 22 carbon atoms. The oily cosmetic for lips according to any one of claims 1 to 3, wherein the alkyl (meth) acrylate (co) polymer is a crosslinked type.