AEROSOL COSMETIC

Abstract

An aerosol cosmetic exhibits an improved feeling of use while having high UV blocking properties. An aerosol cosmetic is filled up as a bulk solution together with a propellant in a pressure-resistant container and includes ethyl alcohol that is a main dispersion medium, an organic ultraviolet absorber, and an ester oil. The organic ultraviolet absorber includes an organic ultraviolet absorber that is solid at room temperature. The solid organic ultraviolet absorber is dissolved in the ester oil.

Claims

1. An aerosol cosmetic, which is filled up as a bulk solution together with a propellant in a pressure-resistant container, comprising: ethyl alcohol that is a main dispersion medium; an organic ultraviolet absorber; and an ester oil; wherein said organic ultraviolet absorber comprises an organic ultraviolet absorber that is solid at room temperature; and said solid organic ultraviolet absorber is dissolved in said ester oil.

2. The aerosol cosmetic, according to claim 1, wherein: said solid organic ultraviolet absorber comprises at least one of bis-ethylhexyloxyphenol methoxyphenyl triazine and diethylamino hydroxybenzoyl hexyl benzoate.

3. The aerosol cosmetic, according to claim 1, wherein: said ester oil is in an amount of 4.5 to 15 times by mass relative to said solid organic ultraviolet absorber.

4. The aerosol cosmetic, according to claim 1, further comprising: a non-lipophilic powder for hair styling.

5. The aerosol cosmetic, according to claim 4, wherein: said non-lipophilic powder for hair styling comprises at least one of calcined sericite and silicic acid anhydride.

6. The aerosol cosmetic, according to claim 4, further comprising: an active agent; wherein a polyglycerin-alkyl co-modified silicone active agent is used as said active agent in an amount of 1 to 10% by mass in said bulk solution.

7. The aerosol cosmetic according to claim 1, wherein: a mass ratio of said ester oil (including a liquid ester ultraviolet absorber) versus the solid ultraviolet absorber is at least 4.5; and a mass ratio of said ethyl alcohol/the ester oil (including a liquid ester ultraviolet absorber) is at least 1.5.

8. The aerosol cosmetic according to claim 6, wherein: said polyglycerin-alkyl co-modified silicone active agent is selected from one or more of a group consisting of bisbutyldimethicone polyglyceryl-3, carboxydecyltrisiloxane, and PEG-10/dimethicone.

Description

MODE FOR CARRYING OUT THE INVENTION

[0030] Hereinafter, the method for producing aerosol cosmetics of Experimental Examples and the method for evaluating each sample will be described.

[0031] Hereinafter, the present invention will be described further in detail by way of specific examples, but the present invention is not limited to the following examples. Further, the content in the following examples indicates “% by mass” unless otherwise specified.

Production Example of Experimental Examples

[0032] An active agent and ultraviolet absorbers are added to oils, and then an alcohol is added thereto. Further, usability improving powders are added thereto, and dispersion is performed using a homomixer to make a bulk (base solution). Thereafter, the bulk (base solution) and a propellant are filled up in an aerosol can (container) at a specific ratio.

Evaluation Method of Force for Hair Styling:

[0033] [Force for Hair styling] A sensory evaluation was performed by 10 panelists. Specifically, 3 g of the sample solution was applied to hair, and a force (effect) for hair styling was determined in accordance with the following criteria.

(Evaluation)

[0034] A+: At least 9 panelists agree the force for hair styling is high.
A: 7-8 panelists agree the force for hair styling is high.
B: 5-6 panelists agree the force for hair styling is high.
C: No more than 4 panelists agree the force for hair styling is high.

Method for Evaluating Stickiness in Hair Styling:

[0035] [Stickiness] After application to hair, a sensory evaluation of the texture was performed by 10 panelists, and determination was made in accordance with the following criteria.

(Evaluation)

[0036] A+: At least 9 panelists agree the texture is not sticky.
A: 7-8 panelists agree the texture is not sticky.
B: 5-6 panelists agree the texture is not sticky.
C: No more than 4 panelists agree the texture is not sticky.

Fluffy Styling Effect (Volumized Hair)

[0037] [Fluffy (volumized hair) feeling] After application to hair, a sensory evaluation of the texture was performed by 10 panelists, and determination was made in accordance with the following criteria.

(Evaluation)

[0038] A+: At least 9 panelists agree the hair is volumized to be fluffy.
A: 7-8 panelists agree the hair is volumized to be fluffy.
B: 5-6 panelists agree the hair is volumized to be fluffy.
C: No more than 4 panelists agree the hair is volumized to be fluffy.

Powder Redispersibility in the Bulk State

[0039] A: The formulation was redispersed by shaking 1 to 5 times.
B: The formulation was redispersed by shaking 6 to 20 times.
C: The formulation was redispersed by shaking 21 to 50 times.

Powder Redispersibility in the Aerosol State

[0040] A: The formulation was redispersed by shaking 1 to 5 times.
B: The formulation was redispersed by shaking 6 to 20 times.
C: The formulation was redispersed by shaking 21 to 50 times.

Method for Evaluating Stability of the Bulk:

[0041] The precipitation of poorly soluble solid ultraviolet absorbers was checked after the container was allowed to stand at room temperature for 2 weeks after emulsification.

A: No poorly soluble solid absorbers precipitated.
B: Poorly soluble solid absorbers precipitated.

Method for Evaluating Stability of Product:

[0042] Aerosol products were allowed to stand still at room temperature, 0° C., and −5° C., and precipitation of poorly soluble solid ultraviolet absorbers was checked after standing for 2 weeks, 2 months, and 1 year.

A: No poorly soluble solid absorbers precipitated.
B: Poorly soluble solid absorbers precipitated.

[0043] Hereinafter, embodiments of the present invention will be described.

[0044] First, the inventors made an attempt to impart UV blocking properties to hair styling aerosol cosmetics by the method set forth above. Specifically, aerosol cosmetics have advantages such as the ease of use for consumers, the uniform application to skin, hair, or the like, and further the capability of suppressing oxidation of the contents, whereas they become unusable when the components precipitate to cause clogging. Therefore, when preparing aerosol cosmetics, it is typical to first form a “bulk” (base solution), in which cosmetic components are dissolved and dispersed in a dispersion medium such as water. A stable composition is prepared in the form of a bulk, and the composition is added to a propellant such as LAG, so that the precipitation of the components in the container is suppressed.

[0045] In particular, solid ultraviolet absorbers tend to precipitate during product storage, but the precipitation of the solid ultraviolet absorbers in the container can be suppressed by dissolving these solid ultraviolet absorbers in ester oil to prepare an emulsified bulk and further dispersing the bulk in a propellant.

TABLE-US-00001 TABLE 1 Experimental Example 1-1 1-2 1-3 1-4 1-5 Deionized water 15 30 0 0 0 Ethyl alcohol 5 6 58 66 69 Active agent Lauryl PEG-9 polydimethylsiloxyethyl dimethicone 5 5 5 5 5 Oils Isododecane 20 20 0 0 0 Decamethylcyclopentasiloxane 5 0 0 0 0 Pentaerythritol tetra 2-ethylhexanoate 5 6 5 0 0 Diisopropyl sebacate 10 10 10 0 0 UV absorbers 2-Ethylhexyl p-methoxycinnamate 10 10 10 10 16 Diethylamino hydroxybenzoyl hexyl benzoate 3 3 3 10 1 UV scattering agent Methylpolysiloxane/Methylhydrogenpolysiloxane coated 10 0 0 0 0 low temperature calcined zinc oxide Usability improving powder (Vinyl dimethicone/methicone silsesquioxane) 7 5 5 5 5 crosspolymer Silicic acid anhydride 0 1 0 0 0 Others Perfume q.s. q.s. q.s. q.s. q.s. Concentrated glycerin 3 3 3 3 3 Bulk:propellant (LPG) 5:5 5:5 5:5 5:5 5:5 Ester oil (including liquid UV absorber)/solid absorber 8.3 8.7 8.3 1.0 16.0 Ethyl alcohol/ester oil (including liquid UV absorber) 0.20 0.23 2.32 6.60 4.31 Evaluation Shampooing B A A A A Stickiness in hair styling B B B C C Bulk stability (2 weeks later) A A B B A Product stability (2 months later) A A A B A Product stability (1 year later) A A A B A

[0046] However, as shown in Table 1, although the hair styling aerosol cosmetic using an emulsified bulk has no problems in the product stability, the shampooing and the stickiness are not satisfactory (Experimental Example 1-1). Note that, the shampooing quality is improved by removing the UV scattering agent (Experimental Example 1-2). The powder surfaces need to be hydrophobized because the UV scattering agent comprises fine particle powders and an aggregation of the fine particle powders in the container causes a significant reduction in the UV scattering effect. If thus the hydrophobized powders adhere to hair or the like, it is difficult to wash and remove the powders immediately using a common shampoo. However, it has been difficult to improve the stickiness in a hair styling when the emulsified bulk is employed.

[0047] On the other hand, in the case of using ethyl alcohol as a dispersion medium and adding a solid ultraviolet absorber that has been dissolved in an ester oil, the bulk forms a homogeneous system instead of an emulsified system (Experimental Example 1-3). Then, an improvement in stickiness in hair styling is also appreciated.

[0048] However, the bulk forming the homogeneous system had precipitation that seemed likely the ultraviolet absorbers after storage for 2 weeks, 2 months, and 1 year, and consequently such bulk is suggested to be unsuitable as a product.

[0049] The reason is probably that in the emulsified systems of Experimental Examples 1-1 and 1-2, the ester oil is dispersed in water and the ultraviolet absorbers are dissolved in the ester oil in a high concentration, but the ester oil is dissolved in ethyl alcohol and diluted, in Experimental Example 1-3, so that the dissolved state of the solid ultraviolet absorbers in the diluted ester oil/ethyl alcohol dispersion medium cannot be maintained.

[0050] On the other hand, the aerosol cosmetics tested for the hair styling qualities and shampooing by the inventors has not provided, surprisingly, the recognizable precipitation of the ultraviolet absorbers after they were allowed to stand for 2 months.

[0051] As a result of studies on this point by the inventors, it turned out that a product system in which at least a propellant was also present showed good stability by dissolving the solid ultraviolet absorbers in the ester oil, and further adjusting the content of ethyl alcohol to at least 1.5 times as much as the content of the ester oil, as described below.

[0052] It should be noted that, when the amount of the ester ultraviolet absorbers in the bulk is 15% by mass or more, the stickiness occurs (Experimental Example 1-5).

[0053] Therefore, the inventors studied powders which impart the hair styling properties under the conditions of a content of the ester oil of 17% by mass (27% by mass including the ester ultraviolet absorbers), the ester oil/the solid ultraviolet absorbers=9, the ethyl alcohol/the ester oil 1.5, and adding bis-ethylhexyloxyphenol methoxyphenyl triazine and diethylamino hydroxybenzoyl hexyl benzoate, which were organic ultraviolet absorbers and solid at room temperature and particularly have a precipitation problem, to the ethanol dispersion medium.

[0054] Table 2 shows the results.

TABLE-US-00002 TABLE 2 Experimental Example 2-1 2-2 2-3 2-4 2-5 2-6 2-7 Ethyl alcohol 57 47 47 47 52 55 45 Active agent Lauryl PEG-9 polydimethylsiloxyethyl dimethicone 5 5 5 5 5 5 6 Oils Glyceryl tri-2-ethylhexanoate 7 7 7 7 7 7 7 Dilsopropyl sebacate 10 10 10 10 10 10 10 UV absorbers 2-Ethylhexyl p-methoxycinnamate 10 10 10 10 10 10 10 Bis-ethylhexyloxyphenol methoxyphenyl triazine 3 3 3 3 3 3 3 Usability improving powder (Vinyl dimethicone/methicone silsesquioxane) 5 5 5 5 5 5 5 crosspolymer Hair styling powder (Dimethicone/vinyl dimethicone) crosspolymer 0 10 0 0 0 0 0 Calcined sericite 0 0 10 0 0 0 10 Methyl methacrylate crosspolymer 0 0 0 10 5 2 2 Others Concentrated glycerin 3 3 3 3 3 3 3 Bulk:propellant (LPG) 5:5 5:5 5:5 5:5 5:5 5:5 5:5 Ester oil (including liquid UV absorber)/solid absorber 9 9 9 9 9 9 9 Ethyl alcohol/ester oil (including liquid UV absorber) 2.11 1.74 1.74 1.74 1.93 2.04 1.67 Evaluation Shampooing A A A A A A A Force for hair styling B B  A+ A A A  A+ Stickiness in hair styling A A A  A+ A A  A+ Bulk stability (2 weeks later) B B B B B B B Product stability (2 months later) A A A A A A A Product stability (1 year later) A A A A A A A

[0055] As is obvious from Table 2, precipitation in the bulk stored for 2 weeks occurred in all Experimental Examples containing the solid organic ultraviolet absorbers. However, in the LPG/ethanol system, precipitation did not occur in any case.

[0056] Further, according to the results in Table 2, the system using calcined sericite as a hair styling powder (Experimental Example 2-3) showed excellent hair styling properties, and the stickiness in hair styling was significantly improved in the system using crosslinked polymethylmethacrylate powder (Experimental Examples 2-4 to 2-6).

[0057] Further, in Experimental Example 2-7 combining the two, both the hair styling-force and the less-stickiness in hair styling were satisfactory.

[0058] Meanwhile, though not shown in Table 2, the hair styling-force is significantly reduced when the surface of the hair styling powder is lipophilized for enhancing the dispersibility of the hair styling powders in aerosol cosmetics. The reason is probably that, whereas the hair styling powders are comparatively flat and the surface thereof is rough so that the force for hair styling is exerted, the surface thereof is smoothened by the lipophilization process.

[0059] Further, hydrophilic powders such as calcined sericite having low affinity to LPG tend to precipitate and aggregate at the bottoms of containers, and further even when they are redispersed by shaking, sedimentation tends to occur earlier.

[0060] Therefore, the inventors have studied various dispersants in order to improve the aggregation resistance and redispersibility of hydrophilic powders. Table 3 shows the results.

TABLE-US-00003 TABLE 3 Experimental Example 3-1 3-2 3-3 3-4 3-5 3-6 Ethyl alcohol 40 40 40 40 40 40 Active agent Lauryl PEG-9 polydimethylsiloxyethyl dimethicone 10 0 0 0 0 0 Bisbutyldmethicone polyglyceryl-3 0 10 0 0 0 0 Carboxydecyl trisiloxane 0 0 10 0 0 0 Cetyl PEG/PPG-10/1 dimethicone 0 0 0 10 0 0 PEG-10 dimethicone/polyoxyethylene-methyl 0 0 0 0 10 0 polysiloxane copolymer PEG-10/dimethicone 0 0 0 0 0 10 Oils Glyceryl tri-2-ethylihexanoate 3 3 3 3 3 3 Oilsopropyl sebacate 7 7 7 7 7 7 UV absorbers 2-Ethylhexyl p-methoxycinnamate 10 10 10 10 10 10 Octocrylene 5 5 5 5 5 5 Diethylamino hydroxybenzoyl hexyl benzoate 3 3 3 3 3 3 Usability improving powder (Vinyl dimethicone/methicone silsesquioxane) 7 7 7 7 7 7 crosspolymer Hair styling powder Calcined sericite 10 10 10 10 10 10 Methyl methacrylate crosspolymer 2 2 2 2 2 2 Others Concentrated glycerin 3 3 3 3 3 3 Bulk:propellant (LPG) 5:5 5:5 5:5 5:5 5:5 5:5 Ester oil (including liquid UV absorber)/solid absorber 8.3 8.3 8.3 8.3 8.3 8.3 Ethyl alcohol/ester oil (including liquid UV absorber) 1.8 1.6 1.6 1.6 1.6 1.6 Evaluation Redispersibility in bulk state C A A C B A

[0061] From the results shown in Table 3, bisbutyldimethicone polyglyceryl-3 (Experimental Example 3-2), carboxydecyl trisiloxane (Experimental Example 3-3), and PEG-10/dimethicone (Experimental Example 3-6) each have excellent effect in improving the redispersibility.

[0062] Consequently, it is understandable that polyether-based, particularly, polyglycerin-alkyl modified silicone-based active agents are suitably used as active agents in the present invention. Studies on powders were also made in consideration of the redispersibility. Table 4 shows the results.

TABLE-US-00004 TABLE 4 Experimental Example 4-1 4-2 4-3 Ethyl alcohol 55 60 55 Active agent PEG-10/dimethicone 3 3 3 Oils Pentaerythritol tetra 2-ethylhexanoate 5 5 5 Diisopropyl sebacate 7 7 7 UV absorbers 2-Ethylhexyl p-methoxycinnamate 10 10 10 Octocrylene 5 5 5 Bis-ethylhexyloxyphenol methoxyphenyl triazine 3 3 3 Usability improving powder Crosslinked silicone-mesh silicone block copolymer 5 5 5 powder Hair styling powder Talc 1 1 1 Calcined sericite 5 0 0 Silicic acid anhydride 0 0 5 Others Concentrated glycerin 1 1 1 Bulk:propellant (LPG) 5:5 5:5 5:5 Ester oil (including liquid UV absorber)/solid 9 9 9 absorber Ethyl alcohol/ester oil (including liquid UV 2.04 2.22 2.04 absorber) Evaluation Powder redispersibility in bulk state A A A Powder redispersibility in aerosol charging B A A Fluffy styling effect (volumized hair) A B A+ Product stability (2 months later) A A A

[0063] From the results shown in Table 4, it is understandable that silicic acid anhydride also can be suitably used as a hair styling powder.

[0064] The inventors further studied the behavior of the ultraviolet absorbers in the aerosol cosmetics. Table 5 shows the results.

TABLE-US-00005 TABLE 5 Experimental Example 5-1 5-2 5-3 5-4 5-5 5-6 5-7 5-8 Ethyl alcohol 58 61 62 58 58 57 45 46 Active agent Bisbutyldimethicone polyglyceryl-3 3 3 3 3 3 3 3 3 Oils Pentearythritol tetra 2-ethylhexanoate 7 4 3 7 7 7 7 7 Diisopropyl sebacate 7 7 7 7 7 7 7 7 UV absorbers 2-Ethylhexyl p-methoxycinnamate 10 10 10 10 10 10 10 10 Octocrylene 1 1 1 1 1 1 1 1 Polysilicone-15 0 0 0 0 0 0 8.5 10 Bis-ethylhexyloxyphenol methoxyphenyl triazine 1 1 1 1 1 1 4.5 3 Diethylamino hydroxybenzoyl hexyl benzoate 3 3 3 3 3 4 3 3 Usability improving powder (Vinyl dimethicone/methicone silsesquioxane) 5 5 5 5 5 5 5 5 crosspolymer Hair styling powder Talc 1 1 1 1 1 1 1 1 Silicic acid anhydride 3 3 3 3 3 3 3 3 Others Concentrated glycerin 1 1 1 1 1 1 1 1 Bulk:propellant (LPG) 5:5 5:5 5:5 5:5 5:5 5:5 5:5 5:5 Ester oil (including liquid UV absorber)/solid absorber 6.25 5.50 5.25 6.25 0.25 5.00 4.47 6.25 Ethyl alcohol/ester oil (including liquid UV absorber) 2.32 2.77 2.95 2.32 2.32 2.28 1.37 1.21 Evaluation Bulk stability (2 weeks later) B B B B B B B B 0° C. Product stability (2 weeks later) A A A A A A B B −5° C. Product stability (2 weeks later) A A A A A A B B

[0065] As is obvious from Table 5, in the case of using ethyl alcohol as the main dispersion medium of the bulk, the ester oil in which the solid ultraviolet absorbers are dissolved cause precipitation in the bulk when the amount thereof is 15 times or less the amount of the solid ultraviolet absorbers, but do not cause precipitation in aerosol until the amount reaches about 4.5 times (although there is no practical problem in Experimental Example 6-7 below, there is a problem in stability in Experimental Example 5-8).

[0066] Therefore, in order to prevent the stickiness, the amount of the ester oil is preferably 30% by mass or less in the bulk (while the amount of the ester ultraviolet absorbers is 15% by mass or less in the bulk), and in order to prevent the precipitation of the solid ultraviolet absorbers in the aerosol, the ester oil is preferably 4.5 to 15 times with respect to the solid ultraviolet absorbers.

[0067] Table 6 shows other formulation examples of the present invention. All of examples showed excellent feeling of use and high stability.

TABLE-US-00006 TABLE 6 Experimental Example 6-1 6-2 6-3 6-4 6-5 6-6 6-7 Ethyl alcohol 61 51 60 57 55.2 55 61 Active agent Bisbutyldimethicone polyglyceryl-3 5 5 0.5 3 3 3 3 PEG-10/dimethicone 5 5 0.5 3 3 3 3 Oils Penteerythritol tetra 2-ethylhexanoate 0 7 7 7 10 7 1 Diisopropyl sebacate 4 7 7 7 9.5 7 7 UV absorbers 2-Ethylhexyl p-methoxycinnamate 10 10 10 10 7 10 10 Octocrylene 0 1 1 1 1 1 1 Bis-ethylhexyloxyphenol methoxyphenyl triazine 0 1 1 0.5 1 1 1 Diethylamino hydroxybenzoyl hexyl benzoate 5 3 3 0.5 1 1 t-Butyl methoxydibenzoylmethane 0.5 0.3 1 1 Etylhexyl triazone 0.5 1 1 Usability improving powder (Vinyl dimethicone/methicone silsesquioxane) 5 5 5 5 5 5 5 crosspolymer Hair styling powder Talc 1 1 Silicic acid anhydride 3 3 3 3 Others Concentrated glycerin 1 1 1 1 1 1 1 Bulk:propellant (LPG) 1:9 1:9 3:7 3:7 5:5 5:5 6:4 Ester oil (including liquid UV absorber)/solid absorber 2.80 6.25 6.25 12.50 21.15 6.25 4.75 Ethyl alcohol/ester oil (including liquid UV absorber) 4.36 2.04 2.40 2.28 2.01 2.20 3.21