Scalp aerosol composition

Abstract

This aerosol composition for the scalp provides a refreshing sensation as it is dispensed with an appropriate amount of foam, gradually defoaming, and the sound of the bubbles bursting suppresses foam collapse and stickiness at low temperatures, resulting in a superior user experience. [Solution] The scalp aerosol composition contains (A) a propellant containing carbon dioxide and dimethyl ether (DME), and an aqueous stock solution, wherein the aqueous stock solution contains (B) sodium polyacrylate, (C) a gemini-type anionic surfactant, and (D) a natural thickener excluding hyaluronic acid and hyaluronic acid derivatives, wherein the content of component (B) in the aqueous stock solution is 0.01 to 0.07% by mass, the content of component (C) is 0.008 to 0.06% by mass, the content of component (D) is 0.01 to 0.05% by mass, and the total content of components (B), (C), and (D) ((B) + (C) + (D)) is 0.1% by mass or less.

Description

Technical Field

[0001] The present invention relates to a scalp aerosol composition.

Background Art

[0002] As an aerosol composition that defoams while making a sound, one containing an aqueous stock solution containing a monohydric and / or dihydric alcohol and a soluble compressed gas is known (see, for example, Patent Document 1). However, although such an aerosol composition gives a feeling of soaking into the skin, there are problems such as a feeling of stickiness and collapse of the foam at low temperatures.

[0003] On the other hand, it is known that gemini-type amphiphilic compounds are used in foamy leave-on cosmetics in order to have a fast foam disappearance rate, an appropriate amount of foam even at low temperatures, and no feeling of stickiness (see, for example, Patent Document 2). However, gemini-type amphiphilic compounds have never been used in aerosol compositions, and the effect of the refreshing feeling due to the sound of the foam popping has not been known.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] The present invention has been made in view of the above situation, and an object thereof is to provide a scalp aerosol composition that starts to gradually defoam after being discharged with an appropriate amount of foam, gives a refreshing feeling due to the sound of the foam popping, suppresses collapse of the foam and stickiness at low temperatures, and has excellent usability.

Means for Solving the Problems

[0006] As a result of diligent research to solve the above problems, the present inventors have found that in a scalp aerosol composition containing (A) a propellant containing carbon dioxide and dimethyl ether (DME) and an aqueous stock solution, by combining (B) sodium polyacrylate, (C) a gemini-type anionic surfactant, and (D) a natural thickener excluding hyaluronic acid and hyaluronic acid derivatives with the aqueous stock solution, the foam is dispensed in an appropriate amount of foam, then gradually begins to subside, providing a refreshing sensation through the sound of the bubbles popping, suppressing foam collapse at low temperatures, preventing stickiness, and resulting in a superior user experience. Thus, the present invention has been completed.

[0007] In other words, the present invention is as follows. [1] A scalp aerosol composition comprising (A) a propellant containing carbon dioxide and dimethyl ether (DME), and an aqueous stock solution, wherein the aqueous stock solution contains (B) sodium polyacrylate, (C) a gemini-type anionic surfactant, and (D) a natural thickener excluding hyaluronic acid and hyaluronic acid derivatives, wherein the content of component (B) in the aqueous stock solution is 0.01 to 0.07% by mass, the content of component (C) is 0.008 to 0.06% by mass, the content of (D) is 0.01 to 0.05% by mass, and the total content of components (B), (C), and (D) ((B) + (C) + (D)) is 0.1% by mass or less. [2] The scalp aerosol composition according to [1], wherein the aqueous stock further contains (E) ethanol, with the content in the aqueous stock being 1 to 20% by mass. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a scalp aerosol composition that is dispensed with an appropriate amount of foam, gradually begins to defoam, provides a refreshing sensation through the sound of the bubbles popping, suppresses foam collapse at low temperatures, prevents stickiness, and offers a superior user experience. [Modes for carrying out the invention]

[0009] The present invention will be described in detail below, but the present invention is not limited to the following embodiments. The present invention is not limited to each of the configurations described below, and various modifications are possible within the scope of the claims, and embodiments and examples obtained by appropriately combining the technical means disclosed in different embodiments and examples are also included in the technical scope of the present invention. Furthermore, unless otherwise specified in this specification, "A to B" representing a numerical range means "greater than or equal to A and less than or equal to B".

[0010] <Aerosol composition for scalp> The scalp aerosol composition according to this embodiment contains (A) a propellant containing carbon dioxide and dimethyl ether (DME), and an aqueous concentrate. The scalp aerosol composition according to this embodiment is filled into a pressure-resistant container equipped with an aerosol valve to form an aerosol product.

[0011] <(A) Propellant containing carbon dioxide and dimethyl ether (DME)> The scalp aerosol composition according to this embodiment contains a propellant comprising (A) carbon dioxide and dimethyl ether (DME). The carbon dioxide and dimethyl ether (DME) contained in the propellant are the same as those used in conventional aerosol products, and are compressed and liquefied gases that eject the contents from the aerosol container. In addition, the propellant, which is component (A), dissolves slightly in the aqueous concentrate described later, and generates foam when the contents are released into the atmosphere.

[0012] The scalp aerosol composition according to this embodiment is filled into an aerosol container to form an aerosol product. At this time, from the viewpoint of ensuring the safety and good foaming properties of the aerosol product, the internal pressure of the product is preferably 8 kgf / cm². 2 (Gauge pressure) is below 8 kgf / cm². 2 There are no restrictions on the ratio of carbon dioxide and DME in the propellant, provided that the following conditions are met.

[0013] In the scalp aerosol composition according to this embodiment, the amount of foam discharged and the discharge speed of the composition can be appropriately adjusted by adjusting the propellant, such as the ratio of carbon dioxide to DME and the ratio of propellant to the undiluted solution, as well as by adjusting the aerosol container, such as the valve hole diameter (stem hole diameter, housing hole diameter) and the hole diameter of the spray button, depending on the composition of the aqueous stock solution.

[0014] <Aqueous stock solution> The scalp aerosol composition according to this embodiment contains an aqueous stock solution. The aqueous stock solution contains (B) sodium polyacrylate, (C) a gemini-type anionic surfactant, and (D) a natural thickener excluding hyaluronic acid and hyaluronic acid derivatives. In this specification, an aqueous stock solution refers to a hydrophilic solution that can be uniformly mixed with water, in which the components are dissolved and / or dispersed in water.

[0015] The aqueous stock solution of the scalp aerosol composition according to this embodiment contains (B) sodium polyacrylate. Sodium polyacrylate, which is component (B), contributes to generating a popping sound when the foam is gradually defoamed after being dispensed as foam from the aerosol container in the scalp aerosol composition according to this embodiment, and to suppressing stickiness. The content of component (B) in the aqueous stock solution is 0.01 to 0.07% by mass. Component (B) contributes to generating a popping sound when the foam is gradually defoamed. From the viewpoint of generating more sound, it is preferably 0.02 to 0.06 mass%.

[0016] The aqueous stock solution of the scalp aerosol composition according to this embodiment contains (C) a gemini-type anionic surfactant. The gemini-type anionic surfactant is a surfactant compound in which two surfactant units, each consisting of an anionic hydrophilic group and a hydrophobic group, are bonded together by a spacing-retaining portion called a spacer.

[0017] (C) Gemini-type anionic surfactants are not particularly limited, but examples include diacyl glutamate lysine salts. Diacyl glutamate lysine salts can be synthesized by reacting L-lysine hydrochloride with N-fatty acid acyl-L-glutamic acid anhydride. Specific examples of diacyl glutamate lysine salts include dilauramidoglutamidolyl lysine sodium (dilauroyl glutamate lysine sodium), dimyristoyl glutamate lysine sodium, and distearoyl glutamate lysine sodium. In the scalp aerosol composition according to this embodiment, dilauramidoglutamidolyl lysine sodium is preferred from the viewpoint of being gentle on the skin and having an effective surfactant effect even in small amounts. Gemini-type anionic surfactants can also be used individually or in combination of two or more.

[0018] The content of component (C), a gemini-type anionic surfactant, in the aqueous stock solution is 0.008 to 0.06% by mass, preferably 0.01 to 0.05% by mass, from the viewpoint of obtaining an appropriate amount of foam and not hindering defoaming.

[0019] The aqueous stock solution of the aerosol composition for scalp according to this embodiment contains a natural thickener excluding (D) hyaluronic acid and hyaluronic acid derivatives. The natural thickener may be any one that is usually used in ordinary cosmetics and is not particularly limited. Specific examples of the natural thickener include xanthan gum, guar gum, tamarind seed gum, tara gum, locust bean gum, gellan gum, pectin, carrageenan, alginic acid, agar, Sphingomonas culture extract, quince seed extract, cationized guar gum, cationized xanthan gum, methyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, and the like. Further, the natural thickener as the component (D) can be used alone or in combination of two or more. In addition, the hyaluronic acid derivatives in this specification include metal salts of hyaluronic acid such as sodium hyaluronate, potassium hyaluronate, magnesium hyaluronate, calcium hyaluronate, aluminum hyaluronate, and those obtained by etherifying, esterifying, amidating, acetylating, acetalizing, or ketalizing the hydroxyl group, carboxyl group, etc. of hyaluronic acid.

[0020] (D) The natural thickener excluding hyaluronic acid and hyaluronic acid derivatives, which is a component, contributes to suppressing the collapse of the foam discharged from the aerosol container at low temperature and not interfering with defoaming. The content of the natural thickener in the aqueous stock solution is 0.01 to 0.05% by mass, preferably 0.02 to 0.04% by mass.

[0021] Furthermore, in the aqueous stock solution contained in the aerosol composition for scalp according to this embodiment, the total content ((B) + (C) + (D)) of (B) sodium polyacrylate, (C) gemini anionic surfactant, and (D) natural thickener excluding hyaluronic acid and hyaluronic acid derivatives is 0.1% by mass or less.

[0022] The aerosol composition for scalp according to this embodiment contains an aqueous stock solution including (A) a blowing agent containing carbon dioxide gas and dimethyl ether (DME), (B) sodium polyacrylate, (C) a gemini anionic surfactant, and (D) a natural thickener excluding hyaluronic acid and hyaluronic acid derivatives. In the aqueous stock solution, the content of component (B) is 0.01 to 0.07% by mass, the content of component (C) is 0.008 to 0.06% by mass, and the content of component (D) is 0.01 ~0.05% by mass, and further, by setting the total content ((B)+(C)+(D)) of components (B), (C), and (D) to 0.1% by mass or less, after being discharged with an appropriate amount of foam, it starts to defoam gradually, and a refreshing feeling can be obtained from the sound of the foam bouncing, suppressing the sagging of the foam at low temperatures, preventing a dull feeling, and achieving excellent usability.

[0023] The aerosol composition for scalp according to this embodiment may contain (E) ethanol in the aqueous stock solution. Ethanol can be used to strengthen the foam film in the foam discharged from the aerosol container. As ethanol, those commonly used in ordinary cosmetics may be used. When contained in the aqueous stock solution, the content of ethanol in the aqueous stock solution is preferably 1 to 20% by mass.

[0024] Furthermore, within a range that does not impair the same effect in the present invention, in addition to the above components, one or more selected from moisturizing agents, activators, amino acids, extraction extracts, cooling agents, preservatives, antibacterial agents, antioxidants, active ingredients, fragrances, chelating agents, pH adjusters, etc. may be included.

Examples

[0025] Hereinafter, the aerosol composition for scalp according to this embodiment will be specifically described by exemplifying examples and comparative examples, but it is not limited by these examples. For the aerosol compositions for scalp described in the examples and comparative examples, test methods regarding the absence of dullness, foam amount, sound of the foam bouncing, and foam amount at low temperatures are shown below.

[0026] (1) Absence of dullness Five expert panelists performed a sensory evaluation by spraying each sample, stored at 22°C, onto the side of their heads and checking whether or not it felt slippery when spread on the scalp. The evaluation criteria are as follows. <Evaluation Criteria for Non-Slippery Texture> ◎: 4 or more people determined that it was not slimy. ○: Three people determined that it was not slimy. △: Two people determined that it was not slippery. ×: Four or more people judged it to be slimy.

[0027] (2) Foam volume Each sample, stored at 22°C, was dispensed into a liquid volume meter (conical, 20 mL capacity) for 2 seconds, and the foam volume was measured. The evaluation criteria are as follows. <Foam volume evaluation criteria> ◎:15mL or more ○: 10 mL or more and less than 15 mL △: 5mL or more but less than 10mL ×: Less than 5mL

[0028] (3) The sound of bubbles popping A panel of 20 experts conducted a sensory evaluation by spraying each sample, stored at 22°C, onto the side of their heads and checking whether or not a popping sound was heard. The evaluation criteria were as follows: <Evaluation Criteria for the Sound of Bubbles Popping> ◎: More than 15 people detected a sound. ○: 10 to 15 people detected a sound. △: 5 to 10 people detected a sound. ×: More than 15 people determined that there was no sound.

[0029] (4) Amount of foam at low temperature Each sample, stored at 0°C, was dispensed into a liquid volume meter (conical, 20 mL capacity) for 2 seconds, and the foam volume was measured. The evaluation criteria are as follows. <Foam volume evaluation criteria> ◎:10mL or more ○: 5mL or more and less than 10mL △: 3 mL or more but less than 5 mL ×: Less than 3mL

[0030] Examples 1-11 and Comparative Examples 1-15 The scalp aerosol compositions described in Tables 1, 2, and 3 were prepared by conventional methods, filled into aerosol containers, and manufactured into aerosol products. The non-slippery feel, foam volume, foam bursting sound, and foam volume at low temperatures of the scalp aerosol compositions were evaluated. The results are shown in Tables 1, 2, and 3.

[0031] [Table 1]

[0032] [Table 2]

[0033] [Table 3]

[0034] As is clear from Tables 1, 2, and 3, the scalp aerosol compositions of Examples 1 to 12 all showed superior performance compared to the scalp aerosol compositions of Comparative Examples 1 to 16.

Claims

1. (A) A scalp aerosol composition comprising a propellant containing carbon dioxide and dimethyl ether (DME), and an aqueous concentrate, The aforementioned aqueous concentrate (B) Sodium polyacrylate and (C) Gemini-type anionic surfactant and (D) Contains natural thickeners other than hyaluronic acid and hyaluronic acid derivatives, In the aforementioned aqueous stock solution, (B) The content of component is 0.01 to 0.07% by mass, (C) The content of component is 0.008 to 0.06% by mass, (D) The content of component is 0.01 to 0.05% by mass, A scalp aerosol composition characterized in that the total content of component (B), component (C), and component (D) ((B) + (C) + (D)) is 0.1% by mass or less.

2. The scalp aerosol composition according to claim 1, wherein the aqueous stock further contains (E) ethanol, and the content in the aqueous stock is 1 to 20% by mass or less.

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