Non-aqueous composition and hair treatment method

Abstract

To provide a non-aqueous composition useful for UV protection, such as adjusting PA (Protection Grade of UVA) or SPF (Sun Protection Factor), and a hair treatment method. [Solution] The non-aqueous composition is for skin or hair use and has a viscosity of 10 mPa·s or more, and contains 0.5% by mass or more of an ultraviolet absorber (however, the meaning of the amount of ultraviolet absorbers other than 2-ethylhexyl paramethoxycinnamate and 2-[4-(diethylamino)-2-hydroxybenzoyl]hexyl benzoate is the same hereinafter). The hair treatment method uses this non-aqueous composition.

Description

[Technical Field]

[0001] The present invention relates to a non-aqueous composition for skin or hair, and a hair treatment method using the non-aqueous composition. [Background Art]

[0002] Hair is exposed to sunlight in daily life, and is simultaneously affected by the ultraviolet rays contained in sunlight. Such influences are reported to include hair damage and fading of hair that has undergone hair color treatment. It is also widely known that skin is also affected by ultraviolet rays.

[0003] For UV protection of hair, it is known in the art to incorporate UV absorbers into hair cosmetics, and hair products containing such ingredients are available on the market. Some of such products are labeled with PA (Protection Grade of UVA), which is an indicator of protection of skin against UVA, and SPF (Sun Protection Factor), which is an indicator of protection against UVB. Such labeling may stimulate consumers' willingness to purchase. Further, since PA or SPF (hereinafter sometimes referred to as "PA etc.") has a function of protecting skin, it can be said that such products can also be applied for skin use.

[0004] Hair cosmetics containing UV absorbers are also disclosed in literature. For example, Patent Document 1 discloses a non-aqueous hair cosmetic containing 2-ethylhexyl paramethoxycinnamate and hexyl 2-[4-(diethylamino)-2-hydroxybenzoyl]benzoate as a specific cosmetic (see Examples and Comparative Examples). In addition, Patent Document 2 also discloses a hair cosmetic containing 2-ethylhexyl paramethoxycinnamate and hexyl 2-[4-(diethylamino)-2-hydroxybenzoyl]benzoate (see Claim 1), and the hair cosmetic can be sprayed in the form of mist (Paragraph 0001), so it can be understood that it has low viscosity. [Prior Art Literature] [Patent Literature]

[0005] [Patent Document 1] Japanese Patent Publication No. 2017-109954 [Patent Document 2] Japanese Patent Publication No. 2013-107838 [Overview of the project] [Problems that the invention aims to solve]

[0006] Incidentally, depending on the type of UV absorber, the wavelength range of UV light it specifically absorbs, its stability, and its cost differ. Therefore, it may be necessary to incorporate UV absorbers other than 2-ethylhexyl paramethoxycinnamate and 2-[4-(diethylamino)-2-hydroxybenzoyl]hexyl benzoate, and to adjust their amounts. By selecting and adjusting the amount of these UV absorbers, it is possible to adjust PA and other parameters. Furthermore, since hair contains keratin, the same protein as skin, adjusting PA and other parameters is expected to be useful not only for protecting the skin from UV rays but also for protecting the hair. However, due to reasons such as the cost and supply concerns of UV absorbers, the adjustment of PA and other parameters may be limited.

[0007] In view of the above circumstances, the present invention aims to provide a non-aqueous composition useful for UV protection, such as adjusting PA or SPF, and a hair treatment method using this composition. [Means for solving the problem]

[0008] As a result of diligent research by the inventors, we have found that increasing the viscosity of non-aqueous compositions is useful for UV protection, such as improving PA or SPF, and have completed the present invention.

[0009] In other words, the non-aqueous composition according to the present invention is for use on skin or hair and contains an ultraviolet absorber, characterized in that it has a viscosity of 10 mPa·s or more and the amount of the ultraviolet absorber is 0.5% by mass or more (however, the meaning of the amount of ultraviolet absorbers other than 2-ethylhexyl paramethoxycinnamate and 2-[4-(diethylamino)-2-hydroxybenzoyl]hexyl benzoate is the same hereinafter). In the present invention, the viscosity is set to 10 mPa·s or more in order to improve PA, etc. Furthermore, in the present invention, since the inclusion of a certain amount or more of ultraviolet absorber is effective for ultraviolet protection of skin or hair, the amount of ultraviolet absorber is set to 0.5% by mass or more, and the composition has a non-aqueous structure in order to give the skin or hair a different feel from that of an aqueous composition.

[0010] The non-aqueous composition according to the present invention preferably has a viscosity of 50 mPa·s or higher. A viscosity of 50 mPa·s or higher is suitable for improving PA and other properties.

[0011] The non-aqueous composition according to the present invention preferably contains 1.0% by mass or more of the ultraviolet absorber. A concentration of 1.0% by mass or more is suitable for improving PA and other properties.

[0012] The non-aqueous composition according to the present invention, for example, contains a volatile silicone, wherein the amount of the volatile silicone is 40% by mass or more. In a non-aqueous composition containing 40% by mass or more of volatile silicone, the PA and other properties improve as the viscosity increases.

[0013] The non-aqueous composition according to the present invention, for example, contains a volatile hydrocarbon, with the amount of said volatile hydrocarbon being 20% ​​by mass or more. In a non-aqueous composition containing 20% ​​by mass or more of volatile hydrocarbons, the PA and other properties improve as the viscosity increases. Furthermore, volatile cyclic silicones such as decamethylcyclopentasiloxane, which are classified as volatile silicones, are highly versatile ingredients, and their supply is sometimes a concern due to the increasing global demand for them in cosmetics. In this context, the inclusion of 20% by mass or more of volatile hydrocarbons is suitable for reducing the amount of volatile cyclic silicones used.

[0014] In the non-aqueous composition according to the present invention, the volatile hydrocarbon may be a volatile hydrocarbon with a lower kinematic viscosity than decamethylcyclopentasiloxane. When a volatile hydrocarbon with a lower kinematic viscosity than decamethylcyclopentasiloxane is blended, if this blend is a substitute for decamethylcyclopentasiloxane, there is a risk of a decrease in PA, etc., due to a decrease in the viscosity of the non-aqueous composition. However, by setting the viscosity to 10 mPa·s or higher, as in the present invention, the decrease in PA, etc., can be suppressed.

[0015] Furthermore, the hair treatment method according to the present invention is characterized by using the non-aqueous composition according to the present invention. [Effects of the Invention]

[0016] The non-aqueous composition according to the present invention contains 0.5% by mass or more of a predetermined ultraviolet absorber and has a viscosity of 10 mPa·s or more, making it excellent for protecting skin or hair from ultraviolet rays.

[0017] Furthermore, the hair treatment method according to the present invention uses a non-aqueous composition containing 0.5% by mass or more of a predetermined ultraviolet absorber and having a viscosity of 10 mPa·s or higher, thereby enabling excellent protection against ultraviolet rays for the skin or hair. [Modes for carrying out the invention]

[0018] The present invention will be described below based on embodiments of the present invention. The non-aqueous composition according to this embodiment has a viscosity of 10 mPa·s or more and contains a predetermined ultraviolet absorber in an amount of 0.5% by mass or more, and is used for skin or hair.

[0019] The composition of the present embodiment is non-aqueous, and "non-aqueous" herein means that the external phase of the composition does not have an aqueous phase, and the external phase thereof is an oil phase. When water is blended, separation of the aqueous phase and the oil phase and clouding of the composition are likely to occur, so it is preferable not to blend water. When water is blended, the blending amount thereof is preferably less than 5.0% by mass, more preferably less than 3.0% by mass, still more preferably less than 1.0% by mass, even more preferably less than 0.5% by mass, and still even more preferably less than 0.1% by mass.

[0020] The viscosity of the non-aqueous composition of the present embodiment is 10 mPa·s or more. Here, the viscosity is measured using a rheometer [for example, a rheometer "Rheo Stress 6000 (trade name) manufactured by HAAKE", under the conditions of measurement temperature: 25°C, diameter of cone plate sensor: 35 mm, inclination angle of cone plate sensor: 2°, shear rate dγ / dt: 36 s -1 -1, and is a value measured in steady flow curve mode.

[0021] The above viscosity is preferably 10 mPa·s or more and less than 5000 mPa·s, more preferably 20 mPa·s or more and less than 3000 mPa·s, still more preferably 50 mPa·s or more and less than 1000 mPa·s, even more preferably 100 mPa·s or more and less than 800 mPa·s, and still even more preferably 200 mPa·s or more and less than 600 mPa·s. When the viscosity is 10 mPa·s or more, it is suitable for UV protection of the skin or hair, and suitable for handleability when applying the non-aqueous composition of the present embodiment by hand; when the viscosity is less than 5000 mPa·s, it is suitable for permeability into the interior of hair.

[0022] When it is necessary to increase the viscosity of the non-aqueous composition of the present embodiment, a common method for increasing the viscosity may be employed. For example, to increase the viscosity by adding a component (this component is referred to as "additional component" for convenience), a substance having a higher viscosity than the composition before blending the component is used as the additional component. Additional components are not limited to single components such as ester oils, and also include those composed of multiple components such as a decamethylcyclopentasiloxane solution of highly polymerized methylpolysiloxane and an isododecane solution of highly polymerized methylpolysiloxane.

[0023] The non-aqueous composition of the present embodiment contains, as an essential component, an ultraviolet absorber other than 2-ethylhexyl paramethoxycinnamate and hexyl 2-[4-(diethylamino)-2-hydroxybenzoyl]benzoate (hereinafter sometimes referred to as "predetermined ultraviolet absorber").

[0024] The aforementioned predetermined ultraviolet absorber is a known ultraviolet absorber, and examples thereof include: benzoic acid ester-based ultraviolet absorbers (such as p-aminobenzoic acid, ethyl p-aminobenzoate, glyceryl p-aminobenzoate, amyl p-dimethylaminobenzoate, ethyl 4-[N,N-di(2-hydroxypropyl)amino]benzoate); salicylic acid-based ultraviolet absorbers (such as ethylene glycol salicylate, 2-ethylhexyl salicylate, homomenthyl salicylate); cinnamic acid-based ultraviolet absorbers (such as glyceryl mon-2-ethylhexanoate diparamethoxycinnamate, isopropyl paramethoxycinnamate, 2-ethylhexyl paramethoxycinnamate, diisopropyl cinnamate); benzophenone-based ultraviolet absorbers (such as dihydroxydimethoxybenzophenone, sodium dihydroxydimethoxybenzophenone disulfonate, dihydroxybenzophenone, tetrahydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, hydroxymethoxybenzophenone sulfonic acid, sodium hydroxymethoxybenzophenone sulfonate); 2-ethylhexyl 2-cyano-3,3-diphenylprop-2-enoate, menthyl anthranilate, terephthalylidene dicamphor sulfonic acid, 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine, bis-ethylhexyloxyphenol methoxyphenyl triazine, 4-tert-butyl-4'-methoxy-dibenzoylmethane, and 2,2'-methylenebis(6-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol).

[0025] One or more of the above-mentioned specified ultraviolet absorbers are blended into the non-aqueous composition of this embodiment, and the amount of the above-mentioned specified ultraviolet absorbers in the non-aqueous composition of this embodiment is 0.5% by mass or more. In some known compositions, a small amount of ultraviolet light is added to improve the stability of the composition itself against light such as sunlight, but in the non-aqueous composition of this embodiment, the amount is set to 0.5% by mass or more, as described above, for protection against ultraviolet light on the skin or hair. Furthermore, the amount of the above-mentioned specified ultraviolet absorber is preferably 1.0% by mass or more and less than 30% by mass, preferably 2.0% by mass or more and less than 25% by mass, more preferably 3.0% by mass or more and less than 20% by mass, and even more preferably 5.0% by mass or more and less than 18% by mass. An amount of 1.0% by mass or more of the specified ultraviolet absorber is suitable for protection against ultraviolet light on the skin or hair, and an amount of less than 30% by mass is suitable for cost reduction.

[0026] When the above-mentioned specified ultraviolet absorber is included, 2-ethylhexyl paramethoxycinnamate and / or 2-[4-(diethylamino)-2-hydroxybenzoyl]hexyl benzoate can be optionally added to the non-aqueous composition of this embodiment. When this optional addition is made, the amounts added to the non-aqueous composition of this embodiment are, for example, 2.0% by mass or more and less than 10% by mass for 2-ethylhexyl paramethoxycinnamate, and 0.5% by mass or more and less than 4.0% by mass for 2-[4-(diethylamino)-2-hydroxybenzoyl]hexyl benzoate.

[0027] Some non-aqueous compositions for hair contain volatile silicones and / or volatile hydrocarbons, and in the non-aqueous composition of this embodiment, volatile silicones, volatile hydrocarbons, or both can be optionally added. Volatile silicones and volatile hydrocarbons have characteristics such as being less cold to the touch because they have a lower latent heat of vaporization compared to water, and improving the manageability of hair, making them suitable as solvents for non-aqueous compositions. When volatile silicones and volatile hydrocarbons are added, the amount added in the non-aqueous composition of this embodiment is, for example, 40% by mass or more and less than 90% by mass.

[0028] When a volatile silicone is incorporated into the non-aqueous composition of this embodiment, the volatile silicone may be a volatile cyclic silicone (octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane), or a volatile linear silicone (with a kinematic viscosity of 2 mm at 25°C). 2 Examples of known volatile silicones include those with a fissure of approximately 1 / s or less, such as trimethicone, and it is preferable to incorporate one or more volatile silicones into the non-aqueous composition of this embodiment. The amount of volatile silicone in the non-aqueous composition of this embodiment is, for example, 40% by mass or more and less than 90% by mass.

[0029] Decamethylcyclopentasiloxane, a type of volatile silicone, is widely used due to its excellent feel and low cost. When decamethylcyclopentasiloxane is incorporated into the non-aqueous composition of this embodiment, the amount incorporated is, for example, 40% by mass or more and less than 90% by mass.

[0030] When a volatile hydrocarbon is incorporated into the non-aqueous composition of this embodiment, examples of such volatile hydrocarbons include known volatile hydrocarbons such as light liquid isoparaffins and isododecane, preferably those with a boiling point of 260°C or lower at atmospheric pressure. Furthermore, even if the volatile hydrocarbon to be incorporated has a lower kinematic viscosity than decamethylcyclopentasiloxane, increasing the viscosity of the non-aqueous composition of this embodiment can suppress or improve the decrease in PA, etc. (Here, kinematic viscosity is the value measured according to JIS K-2283).

[0031] The non-aqueous composition of this embodiment contains one or more volatile hydrocarbons, and the amount of volatile hydrocarbons in the non-aqueous composition is, for example, 20% by mass or more and less than 90% by mass. This amount is preferably 30% by mass or more, more preferably 40% by mass or more, more preferably 50% by mass or more, even more preferably 60% by mass or more, and even more preferably 70% by mass or more. An amount of 30% by mass or more is suitable for reducing the amount of volatile cyclic silicones used, whose supply is a cause for concern.

[0032] In addition to the components described above, the non-aqueous composition of this embodiment may optionally contain known cosmetic ingredients depending on the intended use of the composition. Examples of ingredients that may be optionally added include nonionic surfactants, cationic surfactants, anionic surfactants, amphoteric surfactants, higher alcohols, hydrocarbons, waxes, ester oils, vegetable oils, silicones, polymer compounds, humectants, preservatives, chelating agents, fragrances, and colorants.

[0033] The non-aqueous composition of this embodiment is for use on the skin or hair, and is best used by applying it to the skin or hair to minimize the effects of ultraviolet light. For example, when using the non-aqueous composition of this embodiment for hair treatment, the non-aqueous composition can be in liquid form, sprayed onto the hair or applied by hand, and then dried with warm air as needed without rinsing. [Examples]

[0034] The present invention will be described in detail below based on examples, etc., but the present invention should not be interpreted as being limited based on the description of these examples.

[0035] Non-aqueous compositions were prepared as examples, comparative examples, and reference examples, and their viscosity, SPF, and UVAPF were measured. Details are as follows.

[0036] (Non-aqueous composition) The non-aqueous compositions of the Examples, Comparative Examples, and Reference Examples are 2-ethylhexyl 2-cyano-3,3-diphenylpropane-2-enoate, 4-tert-butyl-4'-methoxydibenzoylmethane, bis-ethylhexyloxyphenol methoxyphenyl triazine, 2-ethylhexyl paramethoxycinnamate, 2-[4-(diethylamino)-2-hydroxybenzoyl]hexyl benzoate, 2-ethylhexyl isononanoate, dicaprylyl carbonate, and dimer dilinoleic acid. A mixture of dimer dilinoleyl, highly polymerized methylpolysiloxane, and decamethylcyclopentasiloxane (viscosity measurement 60 seconds after the start of measurement at 25°C and rotor speed of 60 rpm using a B-type viscometer: 5000 mPa·s), a mixture of highly polymerized methylpolysiloxane and isododecane (viscosity measurement 60 seconds after the start of measurement at 25°C and rotor speed of 60 rpm using a B-type viscometer: 2700 mPa·s), heavy liquid isoparaffin, isododecane (kinematic viscosity at 37.8°C: 1.35 mm²) 2 It was manufactured using decamethylcyclopentasiloxane ( / s). Details of the blended components and their amounts (units of blending: parts by mass) are as shown in Tables 1 to 5.

[0037] (viscosity) The viscosity of each non-aqueous composition was measured using a HAAKE Rheo Stress 6000 rheometer, at a temperature of 25°C, with a cone plate sensor diameter of 35 mm, a cone plate sensor tilt angle of 2°, and a shear rate dγ / dt of 36 s. -1 The measurements were taken under the following conditions.

[0038] (SPF, UVAPF) For each non-aqueous composition, SPF and UVAPF (UVAPF: an indicator for determining the level of PA) were measured in vitro using a Labsphere UV2000S SPF analyzer, targeting Helioscreen's "HELIOPLATE" coated with 0.0325g of the non-aqueous composition.

[0039] Table 1 below shows the components used in Comparative Example 1a, Examples 1a-1b, Comparative Example 2a, and Examples 2a-2b, their amounts, viscosity, SPF, and UVAPF. Comparisons between Comparative Example 1a and Examples 1a-1b, which use the same components, and between Comparative Example 2a and Examples 2a-2b, confirm that the SPF or UVAPF value improved as viscosity increased.

[0040] [Table 1]

[0041] Tables 2 and 3 below show the components used in Comparative Example 3a, Examples 3a-3b, Comparative Example 4a, Examples 4a-4b, Examples 5a-5b, Examples 6a-6b, and Examples 7a-7b, their amounts, viscosity, SPF, and UVAPF. When the components used are the same, it can be confirmed, as with the results in Table 1, that the SPF or UVAPF value improves as the viscosity increases.

[0042] [Table 2]

[0043] [Table 3]

[0044] Tables 4-5 below show the ingredients, their amounts, viscosity, SPF, and UVAPF used in Reference Examples 1a, 1a-1b, 2a, 2a-2b, and 3a-3b. Although the results in Tables 4-5 do not include UV absorbers other than 2-ethylhexyl paramethoxycinnamate and 2-[4-(diethylamino)-2-hydroxybenzoyl]hexyl benzoate, it can be confirmed that, as with the results in Table 1, the SPF or UVAPF value improved as the viscosity increased when the ingredients were the same. In other words, there is a relationship between viscosity and SPF or UVAPF regardless of the type of UV absorber.

[0045] [Table 4]

[0046] Table 5

Claims

1. A non-aqueous composition for skin or hair containing an ultraviolet absorber, Viscosity of 10 mPa·s or higher, The amount of the aforementioned ultraviolet absorber is 0.5% by mass or more (however, the meaning of the amount of ultraviolet absorbers other than 2-ethylhexyl paramethoxycinnamate and 2-[4-(diethylamino)-2-hydroxybenzoyl]hexyl benzoate is the same hereinafter). Non-aqueous composition.

2. The non-aqueous composition according to claim 1, wherein the viscosity is 50 mPa·s or more.

3. The non-aqueous composition according to claim 1 or 2, wherein the amount of the ultraviolet absorber is 1.0% by mass or more.

4. A non-aqueous composition according to any one of claims 1 to 3, wherein a volatile silicone is blended, and the amount of the volatile silicone is 40% by mass or more.

5. A non-aqueous composition according to any one of claims 1 to 4, wherein a volatile hydrocarbon is blended, and the amount of said volatile hydrocarbon is 20% by mass or more.

6. The non-aqueous composition according to claim 5, wherein the volatile hydrocarbon is a volatile hydrocarbon with a lower kinematic viscosity than decamethylcyclopentasiloxane.

7. A hair treatment method characterized by using a non-aqueous composition according to any one of claims 1 to 6.

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