Stick-type oily cosmetics

Abstract

A stick-shaped oily cosmetic comprising a mixture of hydrogenated polyisobutene having a degree of polymerization of 15-50, a volatile oil, and a wax, characterized in that the content of the hydrogenated polyisobutene having a degree of polymerization of 15-50 in the mixture is 2-30 mass%, the content of the volatile oil in the mixture is 45-85 wt%, and the content of the wax in the mixture is 10-35 mass%.

Description

[Technical Field]

[0001] The present invention relates to a stick-type oily cosmetic preparation. More specifically, the present invention relates to a stick-type oily cosmetic preparation that can be suitably used for foundation, concealer, makeup, eye shadow, sunscreen, etc. [Background technology]

[0002] Stick-type oily cosmetics generally contain ingredients such as wax, oil, etc. As a stick-type oily cosmetic that can impart luster to the skin and provide a moist feeling and long-lasting cosmetic effects, a stick-type oily cosmetic containing (A) 0.5 to 5.0 mass% of an amino acid derivative, (B) 0.1 to 30.0 mass% of a silicone containing an alkyl group having a fluorine atom and a polyoxyalkylene group, (C) 7.0 to 12.0 mass% of a wax, and (D) 20.0 to 70.0 mass% of an isostearate ester has been proposed (see, for example, Patent Document 1).

[0003] In recent years, sanitary masks made of nonwoven fabrics and the like have been worn on people's faces as a preventative measure against infectious diseases caused by viruses such as the novel coronavirus. However, when the sanitary mask is worn on the face, cosmetics used on the face adhere to the sanitary mask and other surfaces. Therefore, there is a need for the development of a stick-type oil-based cosmetic product that is less likely to adhere to the sanitary mask and other surfaces.

[0004] Therefore, in order to make stick-type oily cosmetics less likely to adhere to sanitary masks and the like, it is conceivable to reduce the oil content in the stick-type oily cosmetics. However, if the oil content in the stick-type oily cosmetics is reduced, cracks will occur in the stick-type oily cosmetics, thereby reducing the commercial value of the stick-type oily cosmetics. Furthermore, if the oil content in the stick-type oily cosmetics is increased in order to prevent cracks from occurring in the stick-type oily cosmetics, the stick-type oily cosmetics will begin to adhere to sanitary masks and the like.

[0005] Therefore, in recent years, there has been an urgent need to develop a stick-type oily cosmetic that is both less likely to crack and less likely to adhere to sanitary masks and the like. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-132562 Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention has been made in view of the above-mentioned prior art, and an object of the present invention is to provide a stick-type oily cosmetic that is both less likely to crack and less likely to adhere to a sanitary mask or the like. [Means for solving the problem]

[0008] The present invention provides (1) A stick-type oily cosmetic containing a mixture of hydrogenated polyisobutene having a degree of polymerization of 15 to 50, a volatile oil, and a wax, wherein the content of hydrogenated polyisobutene having a degree of polymerization of 15 to 50 in the mixture is 2 to 30% by mass, the content of volatile oil in the mixture is 45 to 85% by mass, and the content of wax in the mixture is 10 to 35% by mass, and the hydrogenated polyisobutene having a degree of polymerization of 15 to 50 is hydrogenated polyisobutene having a degree of polymerization of 18 to 46, and the volatile oil is Teme Chill Trimethicone is used, or Isododecane It is used in combination with cyclopentasiloxane, methyl trimethicone, or hydrogenated polyisobutene with a degree of polymerization of 3. The wax used has a polyethylene wax content of 50 to 100% by mass. Re stick-type oily cosmetics containing (2) The stick-type oily cosmetic composition according to (1) above, further containing powder. Regarding. [Effects of the Invention]

[0009] According to the present invention, there is provided a stick-type oily cosmetic that is both unlikely to develop cracks and unlikely to adhere to a sanitary mask or the like. DETAILED DESCRIPTION OF THE INVENTION

[0010] As described above, the stick-type oily cosmetic of the present invention is a stick-type oily cosmetic containing a mixture of hydrogenated polyisobutene having a degree of polymerization of 15 to 50, a volatile oil, and a wax (hereinafter, for convenience, simply referred to as the "mixture"). One of the features of the present invention is that the content of hydrogenated polyisobutene having a degree of polymerization of 15 to 50 in the mixture is 2 to 30% by mass, the content of volatile oil in the mixture is 45 to 85% by mass, and the content of wax in the mixture is 10 to 35% by mass. Because the stick-type oily cosmetic of the present invention has the above-mentioned constituent requirements, it exhibits the excellent effects of being less likely to crack and less likely to adhere to sanitary masks and the like.

[0011] (A) Hydrogenated polyisobutene The hydrogenated polyisobutene has the formula (I):

[0012] [ka]

[0013] (wherein n is the degree of polymerization of hydrogenated polyisobutene and represents an integer of 15 to 50). The degree of polymerization of the hydrogenated polyisobutene is 15 or more, preferably 18 or more, from the viewpoint of preventing the stick-type oily cosmetic from adhering to a sanitary mask or the like, and is 50 or less, preferably 46 or less, from the viewpoint of preventing the stick-type oily cosmetic from cracking.

[0014] The viscosity of the hydrogenated polyisobutene at 25°C is preferably 10,000 to 800,000 mPa·s, and more preferably 20,000 to 600,000 mPa·s, from the viewpoints of preventing the stick-type oily cosmetic from adhering to sanitary masks and the like and preventing the occurrence of cracks in the stick-type oily cosmetic. When the viscosity of the hydrogenated polyisobutene at 25°C is 10,000 to 100,000 mPa·s, the viscosity of the hydrogenated polyisobutene can be measured using a Brookfield viscometer (product number: B8L) manufactured by Tokimec Inc., with a rotor No. 4 and a rotation speed of 6 rpm. When the viscosity of the hydrogenated polyisobutene at 25°C is 100,000 to 800,000 mPa·s, the viscosity of the hydrogenated polyisobutene can be measured using a Brookfield viscometer (product name: Helical Type B8R) manufactured by Tokimec Inc., with a TD spindle and a rotation speed of 5 rpm.

[0015] Hydrogenated polyisobutene having a degree of polymerization of 15 to 50 is readily available commercially. Examples of hydrogenated polyisobutene having a degree of polymerization of 15 to 50 include Prisorine (registered trademark) 3758 manufactured by Uniqema and Pearleem (registered trademark) 18, Pearleem (registered trademark) 24, and Pearleem (registered trademark) 46 manufactured by NOF Corporation, but the present invention is not limited to these examples.

[0016] The content of hydrogenated polyisobutene in the mixture is 2% by mass or more, preferably 3% by mass or more, from the viewpoint of preventing the stick-type oily cosmetic from adhering to hygiene masks and the like, and is 30% by mass or less, preferably 28% by mass or less, from the viewpoint of preventing cracks from occurring in the stick-type oily cosmetic and improving the usability of the stick-type oily cosmetic.

[0017] (B) Volatile oil The volatile oil used in the present invention refers to an oil having a boiling point of 270°C or lower at 1 atmosphere. Examples of volatile oils include cyclic silicone oils such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane; branched-chain silicone oils such as methyl trimethicone; n-paraffinic hydrocarbon oils such as n-decane, n-undecane, and n-dodecane; isoparaffinic hydrocarbon oils such as isododecane, isodecane, isohexadecane, light liquid isoparaffin, and hydrogenated polyisobutenes other than the hydrogenated polyisobutenes having a degree of polymerization of 15 to 50; and cyclic paraffinic hydrocarbon oils such as cyclodecane and cyclododecane. However, the present invention is not limited to these examples. These volatile oils may be used alone or in combination of two or more.

[0018] Among the volatile oils, at least one volatile oil selected from the group consisting of cyclic silicone oils, branched chain silicone oils, n-paraffinic hydrocarbon oils, and isoparaffinic hydrocarbon oils is preferred, and at least one volatile oil selected from the group consisting of cyclic silicone oils, branched chain silicone oils, and n-paraffinic hydrocarbon oils is more preferred, from the perspectives of preventing cracks from occurring in the stick-type oily cosmetic, having excellent compatibility with ingredients other than volatile oils, and imparting a light feel and a refreshing finish to the skin when the stick-type oily cosmetic of the present invention is applied to the skin.

[0019] The content of volatile oil in the mixture is 45% by mass or more, preferably 50% by mass or more, from the viewpoint of preventing the stick-type oily cosmetic from adhering to hygiene masks and the like, and is 85% by mass or less, preferably 80% by mass or less, from the viewpoint of preventing cracks from occurring in the stick-type oily cosmetic.

[0020] (C) Wax Examples of waxes include hydrocarbon waxes such as polyethylene wax, polypropylene wax, ethylene-propylene copolymer wax, paraffin wax, ceresin wax, microcrystalline wax, montan wax, and ozokerite wax; plant-derived waxes such as carnauba wax, candelilla wax, rice wax, sunflower wax, and Japan wax; animal-derived waxes such as beeswax and jasmine wax; and silicone waxes, but the present invention is not limited to these examples. These waxes may be used alone or in combination of two or more. The melting point of the wax is not particularly limited, but is usually preferably 60 to 120°C.

[0021] Among waxes, polyethylene wax is preferred from the viewpoints of improving the mechanical strength, such as the bending strength, of the stick-type oily cosmetic of the present invention, and solidifying the components used in the stick-type oily cosmetic of the present invention. The weight-average molecular weight of the polyethylene wax is preferably 500 or more, from the viewpoints of improving the mechanical strength, such as the bending strength, of the stick-type oily cosmetic of the present invention, and solidifying the components used in the stick-type oily cosmetic of the present invention. Furthermore, the upper limit of the weight-average molecular weight of the polyethylene wax is not particularly limited, but from the viewpoints of preventing the stick-type oily cosmetic from adhering to hygiene masks and the like, and preventing the occurrence of cracks in the stick-type oily cosmetic, it is preferably 30,000 or less, more preferably 20,000 or less, and even more preferably 10,000 or less. The weight-average molecular weight of the polyethylene wax is a value measured by gel permeation chromatography.

[0022] Polyethylene wax is readily available commercially. Examples of polyethylene wax include Polyethylene Wax 500 (trade name) manufactured by Toa Kasei Co., Ltd., and PERFORMALENE (registered trademark) 655 and PERFORMALENE (registered trademark) 725 (trade name) manufactured by New Phase Technologies, Inc., but the present invention is not limited to these examples.

[0023] The content of polyethylene wax in the wax is preferably 50 to 100% by mass, and more preferably 55 to 100% by mass, from the viewpoints of improving the bending strength of the stick-type oily cosmetic of the present invention and solidifying the components used in the stick-type oily cosmetic of the present invention. Similarly to the above, the content of waxes other than polyethylene wax in the wax is preferably 0 to 50% by mass, and more preferably 0 to 45% by mass, from the viewpoints of improving the bending strength of the stick-type oily cosmetic of the present invention and solidifying the components used in the stick-type oily cosmetic of the present invention. Examples of waxes other than polyethylene wax include waxes other than polyethylene wax from the above-mentioned examples of wax.

[0024] The wax content in the mixture is 10% by mass or more from the viewpoint of preventing the stick-type oily cosmetic from adhering to a hygiene mask or the like, and is 35% by mass or less from the viewpoint of preventing cracks from occurring in the stick-type oily cosmetic.

[0025] (D) Powder The stick-type oily cosmetic of the present invention may contain powder as needed. Powder refers to particles having an average primary particle diameter of 0.1 μm or more. Examples of powder include pearlescent agents, extender pigments, and coloring pigments, but the present invention is not limited to these examples. The powder may be used alone or in combination of two or more types.

[0026] The average primary particle size of the powder is not particularly limited, but is preferably 0.1 μm or more from the viewpoint of improving the dispersibility of the powder in the stick-type oily cosmetic of the present invention, and is preferably 200 μm or less, more preferably 100 μm or less, and even more preferably 50 μm or less from the viewpoint of reducing the rough feeling when the stick-type oily cosmetic of the present invention is applied to the skin. The average primary particle size of the powder means the median size determined from the volume-based particle size distribution measured by a laser scattering method.

[0027] The amount of powder varies depending on the type of powder and cannot be determined in general, so it is preferable to determine it appropriately depending on the type of powder. The amount of powder per 100 parts by mass of the mixture is preferably 10 parts by mass or more, more preferably 30 parts by mass or more, even more preferably 50 parts by mass or more, and even more preferably 80 parts by mass or more, from the viewpoint of fully exerting the effects of using the powder, and is preferably 300 parts by mass or less, more preferably 250 parts by mass or less, from the viewpoint of preventing cracks from occurring in the stick-type oily cosmetic.

[0028] The stick-type oily cosmetic of the present invention may contain fine particles other than the powder. Examples of such fine particles include fine particles having an average primary particle diameter of less than 0.1 μm, preferably 0.05 μm or less, and more preferably 0.005 to 0.05 μm. Examples of such fine particles include ultraviolet scattering agents having the above average primary particle diameter.

[0029] (E) Other ingredients The stick-type oily cosmetic of the present invention may contain appropriate amounts of ingredients other than the mixture and powder (hereinafter referred to as "other ingredients"), as long as the object of the present invention is not impaired.

[0030] Examples of other ingredients include ultraviolet absorbers, moisturizers, surfactants, antioxidants, fragrances, thickeners, preservatives, antioxidants, texture improvers, oils other than the volatile oils, etc., but the present invention is not limited to these examples. These other ingredients may be used alone or in combination of two or more.

[0031] (F) Stick-type oily cosmetics The stick-type oily cosmetic of the present invention can be obtained by preparing the above-mentioned mixture, the powder and other ingredients used as needed, in appropriate amounts, mixing these ingredients to form a uniform composition, and then placing the resulting dispersion in a container of a predetermined shape and molding it. When preparing the dispersion, the components may be kneaded while heated as needed to ensure uniform dispersion. After preparing the mixture, the mixture may be mixed with the powder and other ingredients used as needed, or before preparing the mixture, the hydrogenated polyisobutene, volatile oil, and wax having a degree of polymerization of 15 to 50 used in the mixture may be mixed with the powder and other ingredients used as needed.

[0032] The stick-shaped oily cosmetic of the present invention can be used by being filled into a container such as a resin container or a metal container having an inner surface corresponding to the predetermined stick shape.

[0033] The oily cosmetic stick preparation obtained in this manner is unlikely to adhere to a sanitary mask or the like when it comes into contact with the mask, and is unlikely to crack. Therefore, the oily cosmetic stick preparation can be suitably used for, for example, foundation, concealer, makeup, eye shadow, sunscreen, etc. [Example]

[0034] Next, the stick-type oily cosmetic of the present invention will be described in more detail based on examples, but the present invention is not limited to these examples.

[0035] Examples 1 to 20 and Comparative Examples 1 to 2 The components shown in Tables 1 and 2 were mixed to a uniform composition, and the resulting dispersion was degassed and then filled into a mold having an inner surface corresponding to the desired shape of the stick-type oily cosmetic, thereby obtaining a stick-type oily cosmetic.

[0036] The powder used had an average primary particle size of 0.1 to 50 μm. The average primary particle sizes of the silicone-treated titanium oxide fine particles and silicone-treated zinc oxide fine particles used as ultraviolet scattering agents (referred to as UV scattering agents in Tables 1 and 2) were both 0.005 to 0.05 μm.

[0037] [Table 1]

[0038] [Table 2]

[0039] Next, the properties of the stick-type oily cosmetic preparations obtained above were evaluated using the following methods, including ease of application, prevention of cosmetic adhesion, and crack resistance of the stick. The results are shown in Table 3.

[0040] (1) Ease of application Twenty female panelists were asked to evaluate the ease of application. Each panelist applied the oily cosmetic stick to the skin to the extent that the skin on the cheek was sufficiently colored within a circle approximately 4 cm in diameter around the area where the sanitary mask would cover the cheek, and the ease of application was checked based on the following evaluation criteria.

[0041] [Evaluation criteria] A: 20 panelists evaluated that the stick-type oily cosmetic had an appropriate hardness and was easy to apply to the skin (passed). B: 16 to 19 panelists evaluated that the stick-type oily cosmetic had an appropriate hardness and was easy to apply to the skin (pass) C: 12 to 15 panelists evaluated that the stick-type oily cosmetic had an appropriate hardness and was easy to apply to the skin (pass) D: 8 to 11 panelists evaluated that the stick-type oily cosmetic had an appropriate hardness and was easy to apply to the skin (failed) E: 0 to 8 panelists evaluated that the stick-type oily cosmetic had an appropriate hardness and was easy to apply to the skin (failed)

[0042] (2) Prevents cosmetics from sticking Twenty female panelists were asked to evaluate the anti-adhesion properties. Each panelist applied a stick-type oily cosmetic to the skin of their cheeks within a circle approximately 4 cm in diameter where the sanitary mask would be covered by their cheeks, to the extent that the skin was sufficiently stained. They then attached a sanitary mask (a sanitary mask made of polypropylene nonwoven fabric with a three-layer structure, 95 mm long and 175 mm wide) to their face and used it for approximately 6 hours. After that, they removed the sanitary mask from their face and checked whether the sanitary mask had been stained by the stick-type oily cosmetic. The anti-adhesion properties of the cosmetic were evaluated based on the following evaluation criteria.

[0043] [Evaluation criteria] A: 20 panelists evaluated that the sanitary mask was not stained by the oily cosmetic stick (passed). B: 16 to 19 panelists evaluated that the sanitary mask was not stained by the oily cosmetic stick, and the remaining panelists evaluated that the sanitary mask was slightly stained by the oily cosmetic stick (pass). C: 12 to 15 panelists evaluated that the sanitary mask was not stained by the oily cosmetic stick, and the remaining panelists evaluated that the sanitary mask was slightly stained by the oily cosmetic stick (pass). D: Panelists 1 to 11 evaluated that no discoloration due to the stick-type oily cosmetic was observed on the sanitary mask, and the other panelists evaluated that slight discoloration due to the stick-type oily cosmetic was observed on the sanitary mask (failed) E: No panelists rated the sanitary mask as not stained by oily cosmetic sticks, or at least one panelist rated the sanitary mask as clearly stained by oily cosmetic sticks (failed).

[0044] (3) Crack resistance of the stick The appearance of the stick-type oily cosmetic preparation was visually observed, and the crack resistance was evaluated based on the following evaluation criteria.

[0045] [Evaluation criteria] A: No cracks were present on the surface of the stick-type oily cosmetic (passed). B: A few small cracks are observed on the surface of the stick-type oily cosmetic, but they do not impair appearance or usability (pass). C: A few small cracks were observed on the surface of the stick-type oily cosmetic, but they did not interfere with appearance or use (passed). D: Some cracks were observed on the surface of the stick-type oily cosmetic preparation, causing problems in appearance or use (failed). E: Numerous cracks were present on the surface of the stick-type oily cosmetic preparation, causing problems in appearance and use (failed).

[0046] (4) Overall evaluation In the evaluations of ease of application, anti-adhesion properties of the cosmetic, and crack resistance of the stick, the performance of the stick-type oily cosmetic was evaluated comprehensively by adding up the scores, with A being 50 points, B being 40 points, C being 30 points, D being 20 points, and E being 0 points. The maximum score for the comprehensive evaluation is 150 points, and the minimum score is 0 points.

[0047] [Table 3]

[0048] The results shown in Table 3 show that the stick-type oily cosmetics obtained in each Example all had an overall rating of 120 points or more, and the evaluation of the crack resistance of the stick met the pass criteria. In addition, even when the skin on the cheeks was stained with the stick-type oily cosmetic and a sanitary mask was worn on the cheeks, the sanitary mask was hardly stained by the stick-type oily cosmetic, demonstrating excellent ability to prevent cosmetics from adhering.

[0049] Therefore, it can be seen that the stick-type oily cosmetic preparations obtained in each Example were both able to reduce the likelihood of cracking in the stick-type oily cosmetic preparation and also to reduce the likelihood of the stick-type oily cosmetic preparation adhering to sanitary masks and the like.

Claims

1. A stick-type oily cosmetic comprising a mixture of hydrogenated polyisobutene having a degree of polymerization of 15 to 50, a volatile oil, and a wax, the content of hydrogenated polyisobutene having a degree of polymerization of 15 to 50 in the mixture is 2 to 30% by mass, the content of volatile oil in the mixture is 45 to 85% by mass, and the content of wax in the mixture is 10 to 35% by mass; The hydrogenated polyisobutene having a degree of polymerization of 15 to 50 is hydrogenated polyisobutene having a degree of polymerization of 18 to 46, As the volatile oil, methyl trimethicone is used, or isododecane is used in combination with cyclopentasiloxane, methyl trimethicone, or hydrogenated polyisobutene having a polymerization degree of 3, The stick-type oily cosmetic contains a wax having a polyethylene wax content of 50 to 100% by mass as the wax.

2. 2. The stick-type oily cosmetic according to claim 1, further comprising a powder.

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