JP2011190195A - Aerosol spray cosmetic for hair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an aerosol spray cosmetic for hair, which does not foam contents and is sprayed in a misty state of fine particle diameters even in a system containing a large amount of water. <P>SOLUTION: The aerosol spray cosmetic for hair comprises a stock solution part and a propellant part and has a mixing ratio (stock solution part/propellant part) of the stock solution part to the propellant part of 45/55-65/35. The stock solution part contains at least a film-forming polymer and water and the propellant part is composed of a mixed gas of water-soluble dimethyl ether and a water-insoluble liquefied petroleum gas. In the aerosol spray, the dimethyl ether is dissolved in water in the stock solution part in the ratio of dimethyl ether: water=1:2 as a mass content ratio. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an aerosol spray cosmetic for hair.

  The aerosol spray cosmetic for hair is a cosmetic in a form in which a propellant such as liquefied petroleum gas, isobutane and dimethyl ether and an aerosol spray composition for hair are filled in a pressure resistant container and sprayed in a mist form. And since it can apply | coat thinly and uniformly to the whole hair, it is widely used mainly as a hairdressing agent. Many of these aerosol spray cosmetics for hair contain a large amount of a volatile solvent such as ethanol in the aerosol spray composition for hair from the viewpoint of spraying as a fine mist and the dryness after application. Yes.

  However, on the other hand, in recent years, various regulations on volatile organic compounds (hereinafter abbreviated as VOC) have been enforced in various countries around the world, and it has become no exception in the cosmetics field in Japan. In view of such a current situation, it can be said that the aerosol spray cosmetic for hair, in which a large amount of VOC as described above is blended, is a cosmetic for which measures must be taken as soon as possible.

  However, in aerosol spray compositions for hair, reducing the amount of volatile solvents such as ethanol and trying to replace them with non-volatile solvents such as water reduces the amount of propellant dissolved in the contents. Therefore, there is a problem that the contents cannot be sufficiently crushed during injection and fine particles cannot be obtained. Furthermore, since a sufficient amount of the propellant does not dissolve, there is a problem that the contents are foamed and cannot be injected as a fine mist.

  In the past, attempts have been made to reduce the blending amount of ethanol and increase the water content in aerosol spray compositions. Specifically, an aerosol spray for hairdressing containing 1 to 50% by weight of ethanol, 0.05 to 5% by weight of a polymer compound for hair fixing, a hairdressing agent stock solution containing water and a propellant composed of dimethyl ether in a specific ratio. Products (for example, see Patent Document 1), aerosol hair-styling compositions (for example, see Patent Document 2) composed of a hair-styling resin, water and dimethyl ether have been proposed.

  Although the amount of ethanol blended in the conventional aerosol spray composition can be reduced and replaced to some extent by the above-mentioned attempts, the pressure in the aerosol container cannot be adjusted because the propellant is dimethyl ether. It is difficult to adjust the spray strength. Further, when the propellant is replaced with liquefied petroleum gas capable of adjusting the pressure from dimethyl ether, there is a problem that the content is foamed and is not injected as a fine mist. Furthermore, in order to obtain a fine particle size, a sufficient amount of propellant is required, and as a result, it is difficult to reduce VOC.

JP-A-9-124449 Japanese Patent Laid-Open No. 3-112918

  The present invention has been made in view of the above prior art, and even in a system containing a large amount of water, the contents can be injected as a mist having a fine particle size without foaming. It is an object to provide an aerosol spray cosmetic for hair.

That is, the present invention
[1] A hair comprising a stock solution part and a propellant part, wherein a blending ratio (stock solution part / propellant part) of the stock solution part and the propellant part is 45/55 to 65/35 For aerosol spray cosmetics,
The stock solution part contains at least a film-forming polymer and water, and the propellant part consists of a mixed gas of water-soluble dimethyl ether and water-insoluble liquefied petroleum gas, and the dimethyl ether is added to the water in the stock solution part. Aerosol spray cosmetic for hair, characterized by being dissolved in a ratio of dimethyl ether: water = 1: 2 as a mass content ratio;
[2] The aerosol spray cosmetic for hair according to [1] above, wherein the mixed gas mass ratio is dimethyl ether / liquefied petroleum gas = 25/75 to 90/10,
[3] The aerosol spray cosmetic for hair according to [1] or [2] above, wherein the water content is 70 to 95% by mass in the stock solution part, and [4] substantially Further, the present invention relates to the aerosol spray cosmetic for hair according to any one of [1] to [3], wherein the stock solution part does not contain ethanol.

  The aerosol spray cosmetic for hair of the present invention is capable of adjusting the pressure in the aerosol container, can freely adjust the strength of spraying at the time of injection, and foams even in a system containing a large amount of water. The content can be ejected as a mist having a fine particle diameter without any effect.

  The aerosol spray cosmetic for hair of the present invention comprises a stock solution part and a propellant part, and the stock solution part contains at least a film-forming polymer and water.

  The film-forming polymer to be used is not particularly limited as long as it can impart excellent hair-styling power, and examples thereof include an anionic film-forming polymer, a cationic film-forming polymer, an amphoteric film-forming polymer, and a nonionic film-forming polymer. It is done. These film-forming polymers may be used alone or in combination of two or more.

  Specific anionic film-forming polymers include (meth) alkyl acrylate copolymer, (meth) acrylic acid / (meth) acrylic acid alkyl copolymer, acrylic resin alkanolamine, methyl vinyl ether / maleic acid ester copolymer Copolymer, vinyl acetate / crotonic acid copolymer, vinyl acetate / crotonic acid / vinyl neodecanoate copolymer, vinyl acetate / crotonic acid / vinyl propionate copolymer, vinyl acetate / maleic acid monobutyl ester / isoborolyl acrylate Copolymer, acrylic acid / alkyl acrylate ester / alkyl acrylamide copolymer, polyvinylpyrrolidone / acrylate / (meth) acrylic acid copolymer, (styrene / alkyl acrylate) copolymer, (styrene / acrylic amide) Copolymer, urethane-acrylic Copolymers, and the like can be exemplified sodium polystyrene sulfonate. In the present specification, “(meth) acryl” means both “acryl” and “methacryl”.

  Specific cationic film-forming polymers include vinylpyrrolidone / N, N-dimethylaminoethyl methacrylic acid copolymer diethyl sulfate, O- [2-hydroxy-3- (trimethylammonio) propyl] hydroxyethylcellulose, Vinyl imidazolium trichloride / vinyl pyrrolidone copolymer, hydroxyethyl cellulose / dimethyl diallylammonium chloride, polyvinyl pyrrolidone / alkylamino acrylate / vinyl caprolactam copolymer, methyl vinyl imidazolium chloride / vinyl pyrrolidone copolymer, (vinyl pyrrolidone / dimethyl Aminopropylmethacrylamide / lauryldimethylaminopropylmethacrylamide) copolymer and the like can be exemplified.

  Specific amphoteric film forming polymers include N-methacryloyloxyethyl N, N-dimethylammonium-α-N-methylcarboxybetaine / methacrylic acid alkyl ester copolymer, N, N dimethyl-N- (2-methacryloyloxy). Ethyl) amine = N-oxide / methacrylic acid alkyl ester copolymer, hydroxypropyl acrylate / butylaminoethyl methacrylate / octylamide acrylate copolymer, monochloroacetic acid of dialkylaminoethyl methacrylate / alkyl methacrylate ester copolymer Examples include amphoteric compounds and (isobutylene / diethylaminopropylmaleimide / maleic acid) copolymers.

  Specific nonionic film-forming polymers include polyvinyl pyrrolidone, vinyl pyrrolidone / vinyl acetate copolymer, vinyl pyrrolidone / methacrylamide / vinyl imidazole copolymer, vinyl methyl ether / ethyl maleate copolymer, polyvinyl alcohol, polyvinyl A caprolactam etc. can be illustrated.

  The content of the film-forming polymer is not particularly limited as long as the desired effect is sufficiently imparted, but usually 3% by mass or more is preferable in the stock solution part, more preferably 5% by mass from the viewpoint of hair styling. That's it. Moreover, from a viewpoint of setting it as a fine particle diameter, 10 mass% or less is preferable, More preferably, it is 8 mass% or less. From these viewpoints, the content of the component (A) is preferably 3 to 10% by mass, more preferably 5 to 8% by mass.

  The water used is not particularly limited as long as it is usually used in cosmetics, and purified water, ion-exchanged water and the like are usually used. The content of water is not particularly limited as long as the desired effect is sufficiently imparted, but usually 70% by mass or more is preferable in the stock solution part, more preferably 75% by mass or more from the viewpoint of eliminating VOC. It is. Moreover, from a viewpoint of setting it as a fine particle diameter, 95 mass% or less is preferable, More preferably, it is 90 mass% or less. From these viewpoints, the content of water is preferably 70 to 95% by mass, and more preferably 75 to 90% by mass.

  Further, in the stock solution part of the aerosol spray cosmetic for hair, in addition to the above-mentioned components, components usually used in cosmetics, for example, hydrocarbon oils such as camellia oil and liquid paraffin, as long as the effects of the present invention are not impaired. Higher alcohols such as cetyl alcohol and isostearyl alcohol; polyhydric alcohols such as 1,3-butylene glycol, propylene glycol and polyethylene glycol; ester oils such as cetyl isooctanoate and isopropyl palmitate; dimethylpolysiloxane, methylphenylpolysiloxane, Silicone oils such as polyether-modified silicones; sugar alcohols such as sorbitol, maltitol, trehalose; preservatives, antioxidants, ultraviolet absorbers, plant extracts, powders, pH adjusters, etc. It is possible .

  Next, the propellant part of the aerosol spray cosmetic for hair of the present invention will be described. The propellant part is composed of a mixed gas composed of dimethyl ether which is water-soluble and liquefied petroleum gas which is water-insoluble.

  The mixing mass ratio of dimethyl ether and liquefied petroleum gas in the mixed gas (dimethyl ether / liquefied petroleum gas) is not particularly limited as long as the internal pressure in the aerosol container can be adjusted to a desired spray state, but the contents are finely divided. From the viewpoint of spraying as a mist with a small particle size, it is preferable to mix in a range satisfying 25/75 to 90/10, more preferably 30/70 to 80/20, and still more preferably 40/60 to 70/30. It is.

  Further, the mixing ratio of the stock solution part and the propellant part (stock solution part / propellant part) in the aerosol spray cosmetic for hair of the present invention is not particularly limited as long as it is jetted as a fine mist, but 45/55. It is preferable to prepare in the range which satisfies -65/35, More preferably, it is 50 / 50-60 / 40.

  In addition, in this invention, the dimethyl ether which is a propellant is melt | dissolving in the ratio of dimethyl ether: water = 1: 2 as a mass content ratio in the water in a stock solution part, It is characterized by the above-mentioned. As a result, the contents can be ejected as a mist having a finer particle diameter.

  The aerosol spray cosmetic for hair of the present invention sprays the contents as a fine mist without foaming by adopting the above-described configuration even though a large amount of water is blended in the stock solution part. Therefore, in conventional aerosol spray cosmetics, it is not necessary to substantially contain ethanol which has been used in a large amount for spraying in a mist form. The term “substantially” as used herein means “not to contain ethanol separately” and does not exclude a small amount of ethanol contained in each compounding component.

  The aerosol spray cosmetic for hair of the present invention may be manufactured by a known method. For example, an aerosol container is filled with a solution in which each component blended in the stock solution is uniformly dispersed, and the aerosol valve is used. After the container is clinched, a manufacturing method in which a mixture of dimethyl ether, which is a propellant, and liquefied petroleum gas is pressure-filled from the stem into the container and a spray button suitable for the spray state is mounted can be exemplified.

  The internal pressure of the aerosol container of the aerosol spray cosmetic for hair can be adjusted as appropriate depending on the filling amount of the propellant, so it is not particularly limited as long as it is adjusted to a pressure at which a desired effect is sufficiently imparted. From the viewpoint of spraying as a fine mist, it is preferable to adjust in a range satisfying 0.2 to 0.65 MPa during production, and more preferably 0.3 to 0.55 MPa.

  Moreover, the average particle diameter of the content sprayed from the aerosol spray cosmetic for hair of the present invention is not particularly limited as long as the content is sprayed as a fine mist, but when sprayed at 25 ° C., 20 to 70 μm. It is preferable that In other words, the various conditions described above may be adjusted as appropriate so that the average particle size of the contents during 25 ° C. injection satisfies the range of 20 to 70 μm.

  EXAMPLES Hereinafter, although this invention is demonstrated further in detail based on an Example, this invention is not limited only to these Examples. The blending amount represents “% by mass” unless otherwise specified. Moreover, the compounding quantity was converted into the pure part as each film formation polymer.

(Sample preparation 1)
According to the composition described in Table 1, the stock solution was prepared according to a conventional method and filled into an aerosol container. Next, after the aerosol valve (stem hole diameter: 0.45 mm, housing hole diameter (lower hole: 0.65 mm, lateral hole diameter: 0.65 mm)) was clinched in the container, the propellant was filled from the stem, and Examples 1-4 and Aerosol spray cosmetics for each hair of Comparative Examples 1 and 2 were prepared and subjected to the following evaluation, and the results are also shown in Table 1.

(Test Example 1: Evaluation of injection state)
About the aerosol spray cosmetics for each hair of Examples and Comparative Examples, the spray state at the time of discharge was visually evaluated according to the following evaluation criteria.

<Evaluation criteria for injection state>
○: Sprayed in mist form ×: Not sprayed in mist form

(Test Example 2: Measurement of particle diameter)
The aerosol spray cosmetics for each hair in Examples and Comparative Examples were stored in a thermostatic bath at 25 ° C. for 3 hours. Subsequently, the average particle diameter of the mist at a location 15 cm away from the injection nozzle when each sample was injected was measured using a laser diffraction particle size distribution analyzer (Spray Tech: manufactured by Malvern).

  From the results shown in Table 1, the aerosol spray cosmetics for hair of Examples 1 to 4 are made into a mist with a fine particle size without foaming even in a system containing a large amount of water. It turns out that it can be injected. On the other hand, it turns out that Comparative Examples 1-2 using a single propellant is not sprayed as a mist and has a large particle diameter.

Claims (4)

An aerosol spray for hair, comprising a stock solution part and a propellant part, wherein the blending ratio of the stock solution part and the propellant part (stock solution part / propellant part) is 45/55 to 65/35 Cosmetics,
The stock solution part contains at least a film-forming polymer and water, and the propellant part consists of a mixed gas of water-soluble dimethyl ether and water-insoluble liquefied petroleum gas, and the dimethyl ether is added to the water in the stock solution part. Aerosol spray cosmetic for hair, which is dissolved in a mass content ratio of dimethyl ether: water = 1: 2.   The aerosol spray cosmetic for hair according to claim 1, wherein a mixed mass ratio of the mixed gas is dimethyl ether / liquefied petroleum gas = 25/75 to 90/10.   The aerosol spray cosmetic for hair according to claim 1 or 2, wherein the water content is 70 to 95 mass% in the stock solution part.   The aerosol spray cosmetic for hair according to any one of claims 1 to 3, wherein the stock solution part contains substantially no ethanol.