JP4782433B2 - Cosmetics - Google Patents

Description

  The present invention relates to a cosmetic for eyelashes having high curling power and excellent high-temperature storage stability.

Conventionally, in cosmetics provided in the form of an oily composition and in the form of a water-in-oil emulsion composition (W / O emulsion), a wax has been used as the oily component. For example, in mascara, it is known that a high curl force can be obtained by containing a large amount of wax. However, particularly when a large amount of high-hardness natural wax is contained, there is a problem that storage stability, particularly storage stability at a high temperature is deteriorated (for example, Patent Document 1).
JP 2001-192559 A

  An object of the present invention is to provide a cosmetic for eyelashes that has a high curling power and is excellent in high-temperature storage stability.

  The present inventor has found that when a specific organopolysiloxane is used together with a volatile hydrocarbon oil and wax, a cosmetic for eyelashes having high curling power and excellent high-temperature storage stability can be obtained.

The present invention includes the following components (A) to (C);
(A) volatile hydrocarbon oil,
(B) wax,
(C) General formula (1)

(In the formula, R ^{1 to} R ⁶ are the same or different and each represents an alkyl group having 1 to 6 carbon atoms, a phenyl group or a naphthyl group, and R ⁷ and R ⁸ are the same or different and have an average carbon number of 16 to 600. A linear or branched saturated hydrocarbon group, and s represents a number of 0 or more)
The cosmetic for eyelashes containing the organopolysiloxane represented by these is provided.

  The cosmetic for eyelashes of the present invention has a high curling power and is excellent in high-temperature storage stability.

  The volatile hydrocarbon oil of component (A) used in the present invention is an oil containing only hydrogen atoms and carbon atoms that can be evaporated at room temperature, and examples thereof include isododecane and hydrogenated polyisobutene. Of these, isododecane and saturated isoparaffinic hydrocarbon oil mainly having 8 to 16 carbon atoms are preferable. As commercial products, Marcazole R manufactured by Maruzen Petrochemical Co., Ltd., IP Solvent 1620 manufactured by Idemitsu Kosan Co., Ltd., and the like 2028 can be used.

  One or more volatile hydrocarbon oils of the component (A) can be used, and 10 to 80% by mass, particularly 25 to 65% by mass in the total composition can obtain a good drying rate. In addition, oily components such as wax necessary for developing curling power and volume can be dispersed and dissolved, which is preferable.

  The component (B) wax used in the present invention preferably has a melting point of 40 ° C. or higher, more preferably 60 to 110 ° C., and is not particularly limited as long as it is usually used in cosmetics. Plant wax, mineral wax, synthetic wax and the like can be used. Specific examples include rice bran wax, carnauba wax, candelilla wax, beeswax, ceresin, paraffin wax, microcrystalline wax, polyethylene wax, and silicone wax. Of these, paraffin wax and microcrystalline wax having a melting point of 50 to 110 ° C. are preferable from the viewpoint of high-temperature storage stability and workability, and beeswax is preferable from the viewpoint of workability and imparting film flexibility. As a commercially available product, HNP-0190 manufactured by Nippon Seiki Co., Ltd., BEES WAX-S manufactured by Croda Japan Co., Ltd., or the like can be used.

  One or more kinds of the component (B) wax can be used, and the content of 5 to 50% by mass, particularly 10 to 40% by mass in the total composition is preferable because the curl strength and volume are expressed.

The organopolysiloxane of component (C) used in the present invention is represented by the general formula (1).
In the formula, among those represented by R ^{1 to} R ⁶ , as the alkyl group having 1 to 6 carbon atoms, a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, a s-butyl group, a t-butyl group, A pentyl group, a hexyl group, etc. are mentioned. R ^{1 to} R ⁶ are particularly preferably a methyl group, an ethyl group, or a phenyl group. R ³ and R ⁴ may be the same or different for every s repeating units.

In the general formula (1), the linear or branched saturated hydrocarbon group represented by R ⁷ and R ⁸ has an average carbon number of 16 to 600, preferably 27 to 300, particularly 30 to 300 are preferred. When the average carbon number is other than 16 to 600, when it is small, it becomes oily and it becomes difficult to effectively exhibit the effect of improving the curling force, and when it is large, workability during polymerization is lowered.
Among such saturated hydrocarbon groups, those having a branched chain are preferably those having a short chain branch of 1 to 5 carbon atoms up to the fifth carbon atom counted from the terminal carbon atom of the saturated hydrocarbon group. Examples of the short-chain branch in this case include a 2-methyl group, a 3-methyl group, and a 2,2-dimethyl group. When the chain length of the saturated hydrocarbon group is short when it has such a short chain branch, the melting point of the organopolysiloxane represented by formula (1) is not affected without affecting other physical properties. Can be reduced.

  In general formula (1), s is a number of 0 or more, but a number of 0 to 50 is preferable, and a number of 0 to 20 is particularly preferable. Within this range, it is possible to sufficiently improve the hardness of the mascara film and to exhibit an excellent curling force.

  Such an organopolysiloxane can be produced, for example, by the method described in JP-A-8-73744.

One or more types of component (C) can be used, and 0.005 to 25% by mass, particularly 0.03 to 12% by mass in the total composition is preferable from the viewpoint of curling power improvement and workability. .
The mass ratio of the component (B) to the component (C) is 50:50 to 99.9: 0.1, particularly 70:30 to 99.7: 0.3. And from the viewpoint of workability.

In addition, the cosmetic of the present invention can contain a film agent and a thickener usually used in cosmetics in the oil phase in order to curl up and hold the eyelashes.
Examples of the film agent include silicone resins such as acrylic silicone, silicone acrylic non-aqueous emulsion, trimethylsiloxysilicic acid; fluororesin; α-olefin / vinylpyrrolidone copolymer. By containing a film agent, the dry film strength can be further improved, and a beautiful finish can be maintained for a long time.

  One or more types of coating agents can be used, and it is preferably 0.1 to 30% by mass, particularly 1 to 20% by mass in the total composition because sufficient film forming ability is expressed.

Examples of the thickener include organically modified clay minerals such as disteardimonium hectorite, disteadimonium bentonite, dimethyl distearyl ammonium hectorite, and dimethyl distearyl ammonium bentonite. These are used as a pregel dispersed in advance by adding a polar additive such as ethanol or propylene carbonate and a solvent, whereby the subsequent workability is further improved. As a commercially available product, Genton Gel ISD V manufactured by Elementis Japan can be used.
One or more organically modified clay minerals can be used, and the content of 0.1 to 20% by mass, particularly 0.3 to 15% by mass in the total composition provides a sufficient thickening effect and is finished. In addition, the storage stability is good and preferable.

Moreover, as a thickener, dextrin fatty acid esters, such as dextrin palmitate, etc. can also be used. The dextrin fatty acid ester also has an effect of improving the dispersibility of the wax. As a commercially available product, Leo Pearl KL manufactured by Chiba Flour Milling Co., Ltd. can be used.
One or more dextrin fatty acid esters can be used, and 0.05 to 20% by mass, particularly 0.3 to 10% by mass in the total composition is preferable in terms of thickening effect and wax dispersion effect. .
A film agent and a thickener can be used in combination.

  As the oily component constituting the oil phase, in addition to the component (A), a natural or synthetic oily component that is liquid at 25 ° C. usually used in cosmetics, for example, non-volatile hydrocarbon oil, silicone oil, ester oil, Fluorine oil or the like can be used. Of these, volatile oil is particularly preferably used from the viewpoint of drying speed after coating and film strength. Examples of the volatile oil other than the component (A) include volatile silicone oils such as octamethyltrisiloxane, decamethyltetrasiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane. In addition, non-volatile hydrocarbon oils, ester oils, silicone oils and the like can be blended in the oil phase in order to improve the feeling of use and finish.

The cosmetic composition of the present invention can be an oily composition or a W / O emulsion composition having an oil phase as a continuous phase. When the cosmetic composition is a W / O emulsion composition, it may contain various surfactants. it can.
The surfactant is not particularly limited as long as it can stably emulsify, and silicone surfactants, nonionic surfactants, and the like can be used. Examples of silicone surfactants include alkyl glyceryl ether-modified silicones, polyoxyethylene / methyl polysiloxane copolymers, dimethicone polyols, alkyl dimethicone polyols, and cross-linked alkyl polyether-modified silicones. Alkyl glyceryl ether-modified silicones and polyoxyethylene / methyl polysiloxane copolymers are preferred. Specifically, SH-3775M manufactured by Toray Dow Corning Silicone Co., Ltd. or the like can be used as a product described in the production example of JP-A-5-39208 or a commercial product.

  As the nonionic surfactant, those having an HLB of about 4 to 10 are preferable, and polyoxyethylene alkyl ether, polyoxyethylene glyceryl monostearate, and alkyl glyceryl ether are particularly preferable.

  One or more surfactants can be used, and it is preferable to contain 0.1 to 5% by mass in the total composition.

  The aqueous phase is composed of an aqueous medium such as water and a lower alcohol having 1 to 4 carbon atoms, and can contain a film agent and various other additives. Examples of the film agent include water-soluble polymers such as polyvinyl alcohol, polyvinyl pyrrolidone, carboxymethyl cellulose, starch, etc. Examples of additives include preservatives, aqueous surfactants, aqueous thickeners, sequestering agents, various Examples include salts. In particular, it is preferable to blend magnesium sulfate as an inorganic salt from the viewpoint of improving high-temperature storage stability and suppressing lumps. Magnesium sulfate is preferably contained in the total composition in an amount of 0.001 to 7 mass%, particularly 0.05 to 3 mass%.

  In addition, a film-forming polymer emulsion that can be quickly dried can be contained for the purpose of further improving the makeup retention and the curl-up effect. Such film-forming polymer emulsions include homopolymer emulsions and copolymer emulsions of alkyl esters of acrylic acid and methacrylic acid, alkyl acrylate / styrene copolymer emulsions, polyvinyl acetate polymer emulsions, silicone polymer emulsions, and the like. In particular, an alkyl acrylate copolymer emulsion is preferred.

  In addition to the above-mentioned components, the cosmetic of the present invention is a component usually used in cosmetics, for example, a spherical powder such as PMMA, nylon powder, silica, etc .; white pigment, organic pigment, inorganic pigment, iron oxide, mica titanium Pigment powder such as bentonite, talc, kaolin and the like, ultraviolet absorbers, ultraviolet scattering agents, humectants, dyes, fragrances, antioxidants and the like. Furthermore, fibers can be used to enhance the long rush effect.

  Various powders should be surface-treated with silicone, higher fatty acid, higher alcohol, fatty acid ester, metal soap, amino acid, alkylsilane, acrylic silicone, fluorine compound, etc., or encapsulated in organic or inorganic microcapsules. Can do. When various powders are contained in the oil phase, the surface of the powder is preferably subjected to a hydrophobic treatment in order to improve dispersibility and high-temperature storage stability. In particular, alkylsilane treatment and silicone treatment are preferred.

  The solid content concentration in the oil phase is 10 to 70% by mass, particularly 30 to 60% by mass, so that the film strength is sufficiently expressed, the volume feeling is excellent, and the storage stability and finish are also good. The solid content is a component that is solid or semi-solid at 25 ° C. in a single state, and is component (B), component (C), film agent, thickener, powder, pigment, fiber, preservative. Etc. are included.

  In a preferred embodiment of the present invention, the components (B) and (C) and the powders / fibers are uniformly dispersed in the continuous oil phase containing the component (A) in which the oil-soluble film agent is dissolved. The aqueous phase containing magnesium sulfate and the like is uniformly emulsified by the activator.

  The cosmetic of the present invention can be obtained by uniformly mixing and stirring each component. For example, the oil phase, the powder, the fiber, and the water phase are sequentially added and mixed while gradually cooling the component (B), the component (C) and the surfactant heated and dissolved while uniformly stirring. Is preferable in terms of wax dispersibility and workability.

The cosmetic obtained in this way is excellent in water resistance because it is a composition having an oil phase as a continuous phase, and excellent in abrasion resistance because it has a film agent such as wax in the oil phase. . In particular, various durability is improved by including a film agent in the oil phase.
Furthermore, it has excellent curling power and high temperature storage stability. Regarding this effect, it is considered that the organopolysiloxane of component (C) has the effect of improving the hardness of the wax, thereby improving the film strength and developing a high curling force. In order to develop the same curling force with a high-hardness natural wax such as carnauba wax, a higher content is required, and high-temperature storage stability is considered to decrease.

  The eyelash cosmetic of the present invention has a viscosity at 25 ° C. of 100,000 to 2,000,000 mPa · s, particularly 150,000 to 1,000,000 mPa · s. When applied to eyelashes, the adhesion to the object is improved and the drying speed is increased. Is preferable because it is fast and can have a good finish.

  The cosmetic for eyelashes of the present invention is applied using a brush in which fibers normally used in mascara are twisted with a wire, an applicator having a comb shape, a coil shape, etc., a resin molded brush formed into a brush shape using a resin, etc. can do. Among these, it is particularly preferable to use a resin-molded brush formed into a brush shape using a resin.

  Resin-molded brushes that are molded into a brush shape using resin can comb teeth in the axial direction at specific intervals, making it easier to get comb teeth into the eyelashes than conventional brushes twisted with wire easy. Further, unlike the comb shape and the coil shape, mascara can be appropriately attached by adopting a brush shape, and can be prepared while applying the mascara. In addition, the resin molded brush can control the comb teeth's elastic modulus by controlling the comb teeth thickness and material, so it can attach an appropriate amount of mascara and easily obtain a clean finish with no unevenness. Can do.

  The resin molded brush will be specifically described with reference to FIG. 1 as an example. The resin-molded brush 10 has an application head 12 at the tip of the application bar 11 and is provided with comb teeth 20 at substantially constant intervals along the axial direction. The resin molding brush 10 is manufactured by insert molding in which an application head 12 is injection-molded around the tip core bar 11A of the application bar 11. As the coating rod 11 and the tip core rod 11A, a resin such as PBT (polybutyl terephthalate), PP (polypropylene), ABS (ABS resin), POM (polyacetal) or the like can be used. The coating head 12 uses a softer resin than the resin of the coating rod 11.

  The application head 12 is provided with a number of comb teeth 20 on the outer periphery of the application part shaft 21 that is attached to the outer periphery over the entire length of the tip core 11 </ b> A of the application bar 11. Each comb tooth 20 has an annular piece 22 provided on each of the outer circumferences at a plurality of positions forming a substantially constant interval (groove width of the annular groove 13) along the axial direction of the application portion shaft 21, and in the circumferential direction of the annular piece 22. Protruding pieces 23 are provided at a plurality of positions (eight in this example) at substantially constant intervals along the radial direction and project outward in the radial direction. The application head 12 has an annular groove 13 around the application part shaft 21 between the annular piece 22 and the protruding piece 23 of the one adjacent comb tooth 20 and the annular piece 22 and the protruding piece 23 of the other comb tooth 20. Form. The width of the annular groove is 0.2 to 0.6 mm.

In this example, the application piece 12 is formed by integrating the annular piece 22 and the protruding piece 23 on the outer periphery of the application portion shaft 21, and the elastic modulus of the annular piece 22 and the protruding piece 23 of the comb teeth 20 is 1 to 200 MPa. To do.
The thickness of the comb teeth 20 is 0.2 to 0.6 mm. The thickness of the comb teeth refers to the thickness of the central portion obtained by combining the length of the annular piece and the protruding portion. The coating head 12 constituting the resin molding brush 10 has the same outer diameter of adjacent protruding pieces 23 within a certain length range excluding the tip side along the axial direction of the coating part shaft 21, In a part of the length range, by making the outer diameter of the projecting piece 23 tapered toward the foremost side, the insertion into the mascara supply container is improved, and the eyelashes and eyelashes on the eye side The shape is easy to apply.

  An example of the application head 12 constituting the resin molding brush 10 will be described with reference to FIGS. The comb teeth 20 (the annular piece 22 and the projecting piece 23) and the application part shaft 21 are made of a soft resin (bending elastic modulus 15.1 MPa), and the comb teeth 20 are provided with eight projecting pieces 23 in a star shape and the application part core rod 11A. The outer diameter a is 1.75 mm, the outer diameter b of the application part shaft 21 is 2.3 mm, the outer diameter c of the annular piece 22 is 2.95 mm, the outer diameter d of the protruding piece 23 is 6.0 mm, The axial thickness e of the annular piece 22 in contact with the outer diameter is 0.4 mm, the axial thickness f of the free end of the protruding piece 23 is 0.2 mm, and the pitch p of the comb teeth 20 (the annular piece 22 and the protruding piece 23) is 0. .8mm.

Examples 1-2 and Comparative Examples 1-2
A mascara of a water-in-oil emulsion composition was produced by uniformly stirring and mixing the components shown in Table 1. All the viscosities were 100,000 to 2,000,000 mPa · s at 25 ° C.
The obtained mascara composition was evaluated for curling power and 50 ° C. storage stability. The results are also shown in Table 1.

(Evaluation methods)
(1) Curl force:
About each mascara composition, actual use evaluation was implemented by 20 female monitors, and the number of persons judged to have curling power was shown.

(2) Storage stability at 50 ° C .:
Each mascara composition was stored in a sealed container and stored at 50 ° C. for 2 weeks. The viscosity before and after storage was measured at 25 ° C., the rate of increase in viscosity was determined, and the following determination was performed. The viscosity was measured with a B8R viscometer.
A: The viscosity increase before and after storage is less than 3 times when stored at 50 ° C. for 2 weeks.
○: Storage at 50 ° C. for 2 weeks, viscosity increase before and after storage is 3 times or more and less than 4 times.
Δ: Storage at 50 ° C. for 2 weeks, viscosity increase before and after storage is 4 times or more and less than 5 times.
×: Storage at 50 ° C. for 2 weeks, viscosity increase before and after storage is 5 times or more.

  From the results shown in Table 1, all of the mascara compositions of the present invention had high curling power and excellent high-temperature storage stability. Moreover, the long rush effect was seen in Example 2 containing a fiber. In contrast, Comparative Example 1, which does not contain the organopolysiloxane of component (C), contains a large amount of carnauba wax, and thus has excellent curling power, but has poor storage stability at 50 ° C. Further, Comparative Example 2 containing mainly beeswax, which does not contain the organopolysiloxane of component (C) and is a low-hardness wax, had good storage stability at 50 ° C., but had insufficient curling power.

  Moreover, using the mascara composition described in Example 1, a normal brush (brush in which 350 fibers having a fiber diameter of 0.15 mm were bundled) and the resin-molded brush shown in FIG. As a result of actual use evaluation, 17 people obtained the opinion that it was better to use a resin-molded brush than a normal brush for ease of handling.

FIG. 1 is a front view showing an example of a mascara applicator. 2 is a cross-sectional view (front view) taken along line II-II in FIG. FIG. 3 is a sectional view taken along line III-III in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Mascara application tool 11 Application | coating stick | rod 11A Application | coating stick tip core stick | rod 12 Application | coating head (applying part)
20 comb teeth 21 application part shaft 22 annular piece 23 projecting piece

Claims (4)

The following components (A) to (C);
(A) 10-80% by mass of volatile hydrocarbon oil,
(B) 5-50% by weight of wax,
(C) General formula (1)

(In the formula, R ^{1 to} R ⁶ are the same or different and each represents a methyl group, an ethyl group or a phenyl group; R ⁷ and R ⁸ are the same or different and are linear or branched having an average carbon number of 16 to 600; A saturated hydrocarbon group, and s represents a number of 0 )
Organopolysiloxane represented by 0.005 to 25% by mass
A cosmetic for eyelashes containing a component (B) and a component (C) in a mass ratio of 50:50 to 99.9: 0.1.   The cosmetic for eyelashes according to claim 1, comprising a film agent and / or a thickener in the oil phase.   The cosmetic for eyelashes according to claim 1 or 2, which is a water-in-oil emulsion composition.   4. The method according to any one of claims 1 to 3, wherein the brush is applied and used with a resin molding brush provided with a plurality of comb teeth at substantially constant intervals along the axial direction and at substantially constant intervals along the circumferential direction. Cosmetics for eyelashes.

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