JP5996936B2 - Effervescent aerosol products - Google Patents

Description

  The present invention relates to a foamable aerosol product that ejects a foam-like composition used as a hair styling agent or the like.

  In general, foamable aerosol products are obtained by filling a container with a valve equipped with a spout with a stock solution containing a surfactant or the like and a propellant such as liquefied petroleum gas. During use, the stock solution ejected from the foamable aerosol product together with the propellant becomes foam.

  The foam as described above is used as a facial cleanser or hair cosmetic. For example, Patent Document 1 discloses a foam-like composition used in hair cosmetics such as hair conditioners and treatments using higher fatty acid salts, silicone, and polyurethane as raw materials. And according to the description of the document, this foam has a good stretch, a uniform film on the hair, gives the hair a good firmness, firmness and volume feeling, is not wrinkled, and has the characteristics of giving flexibility. It is supposed to have.

JP 2009-280527 A

  When a large amount of a surfactant is added for the fineness of the foam and the emulsion stability of the stock solution, the foam tends to harden. However, when such a foam becomes hard, from the viewpoint of improving handling properties. The above-mentioned good elongation is often required. The good elongation of the foam may be required regardless of the content of the surfactant, but it is natural that it may be realized by a combination other than the combination of the above-described blended raw materials disclosed in Patent Document 1. .

  In view of the above circumstances, an object of the present invention is to provide a foamable aerosol product that ejects a foam that is easy to stretch when used.

  As a result of intensive studies by the present inventors, a stock solution containing a higher fatty acid anionic surfactant, and a foamable aerosol product produced by filling a container with a propellant, the stock solution containing a predetermined hydroxyethyl cellulose It has been found that if a polymer is also blended, the foam ejected from the container can be easily stretched by hand, and the present invention has been completed.

  That is, the foamable aerosol product according to the present invention has a container filled with a stock solution and a propellant, and the stock solution contains (a) a higher fatty acid anionic surfactant, and (b) hydroxyethyl cellulose, It is characterized by containing one or more hydroxyethyl cellulose polymers selected from methyl ether of hydroxyethyl cellulose and ethyl ether of hydroxyethyl cellulose.

  In the use of the foamable aerosol product according to the present invention, it is preferable to apply a foam produced by ejecting the stock solution and the propellant from the container to hair. As described above, since the stock solution contains a hydroxyethylcellulose-based polymer, the familiarity of the foam with the hair is improved.

  The number of carbon atoms of the higher fatty acid constituting the (a) higher fatty acid anionic surfactant is preferably 14 or more and 20 or less. When the carbon number is 14 or more, it is good for suppressing irritation to the skin due to the foam used in the usage mode in which a hair styling agent or the like is not washed away, and when the carbon number is 20 or less, the touch of the foam is soft.

  The stock solution preferably contains (c) a nonionic surfactant. By including (c) a nonionic surfactant with (a) a higher fatty acid anionic surfactant, emulsification of the stock solution and stability of the emulsification are improved.

  The stock solution preferably contains (d) a higher alcohol, and (d) the higher alcohol in this stock solution is preferably 3.0% by mass or less. (D) The higher alcohol is suitable for making the foam finer, and (d) that the higher alcohol is 3.0% by mass or less is suitable for stretching the foam.

  In the stock solution, the content of the (b) hydroxyethyl cellulose polymer is preferably 0.5% by mass or less.

  According to the foamable aerosol product according to the present invention, the stock solution filled in the container of this product contains (a) a higher fatty acid-based anionic surfactant and a predetermined (b) hydroxyethyl cellulose-based polymer. The foam produced by being ejected from the container is easy to extend.

Based on an embodiment of the present invention, the present invention will be described below.
The foamable aerosol product according to this embodiment has a container filled with a stock solution and a propellant.

(Stock solution)
The stock solution in the foamable aerosol product of this embodiment is an O / W emulsion in which an oil phase is dispersed in an aqueous phase, and includes (a) a higher fatty acid anionic surfactant and (b) a hydroxyethyl cellulose polymer. It is an essential ingredient. Moreover, as long as it is accept | permitted on actual use, it is good also as an arbitrary component by mix | blending the same thing as the raw material mix | blended with the well-known stock solution. The amount of water in the stock solution is, for example, 70% by mass or more.

(A) Higher fatty acid anionic surfactant (hereinafter sometimes referred to as “component (a)”)
Component (a) is an anion of a higher fatty acid. In order to include one or more of the anions in the stock solution, a higher fatty acid salt and / or a higher fatty acid and an alkali that neutralizes the higher fatty acid salt are blended.

  The higher fatty acid is a monovalent carboxylic acid having 12 or more carbon atoms. The carbon number is preferably 14 or more and 20 or less. When the carbon number is 14 or more, it is good for suppressing irritation felt on the skin, and when the carbon number is 20 or less, the feel of the foam is soft.

  Examples of the higher fatty acid include linear saturated fatty acids such as lauric acid, myristic acid, palmitic acid, stearic acid, and behenic acid; branched saturated fatty acids such as isostearic acid; linear such as oleic acid and linoleic acid Examples include unsaturated fatty acids. A linear saturated fatty acid is preferable for improving foaming properties.

  Examples of the form of the higher fatty acid salt used for including the component (a) in the stock solution include an alkali metal salt and an amine salt. Examples of the alkali metal salt include sodium salt and potassium salt. Examples of the amine salt include 2-amino-2-methyl-1-propanol salt, diisopropanolamine salt, and triethanolamine salt.

  Examples of the higher fatty acid neutralizing alkali used for including the component (a) in the stock solution include sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, and amine (2-amino-2-methyl-1- Propanol, diisopropanolamine, triethanolamine, etc.).

  The amount of component (a) in the stock solution of the present embodiment is preferably 0.5% by mass or more and 5.0% by mass or less, and 1.0% by mass or more and 4.% by mass or less when component (a) is converted as a higher fatty acid. 0 mass% or less is preferable and 2.0 mass% or more and 3.0 mass% or less are more preferable. When it is 0.5% by mass or more, it is preferable for foam formation, and when it is 5.0% by mass or less, it is suitable for softening the foam.

(B) Hydroxyethyl cellulose polymer (hereinafter sometimes referred to as “component (b)”)
Component (b) is one or more selected from hydroxyethyl cellulose, hydroxyethyl cellulose methyl ether, and hydroxyethyl cellulose ethyl ether.

  The amount of the component (b) in the stock solution of this embodiment is preferably 0.01% by mass or more and 0.5% by mass or less, and preferably 0.03% by mass or more and 0.2% by mass or less. When it is 0.01% by mass or more, it is suitable for making the foam easy to stretch, and when it is 0.5% by mass or less, the film formed on the basis of the stock solution becomes soft after being applied to hair or the like.

Optional Components As described above, the stock solution of the present embodiment may be blended with raw materials blended in a known stock solution and included as a component other than components (a) and (b). Examples of such raw materials include anionic surfactants, nonionic surfactants, higher alcohols, polyhydric alcohols, ester oils, fats and oils, hydrocarbons, waxes, silicones, polymer compounds, perfumes, Examples include preservatives and sequestering agents.

  Inclusion of one or more nonionic surfactants (hereinafter sometimes referred to as “component (c)”) in the stock solution of this embodiment is suitable for stabilizing the emulsification of the stock solution. . Examples of the component (c) include polyoxyethylene alkyl ether, polyoxyethylene polyoxypropylene alkyl ether, polyoxyethylene fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbitol tetrafatty acid. Examples include esters, glycerin fatty acid esters, alkyl glucosides, sorbitan fatty acid esters, polyglycerin fatty acid esters, and sucrose fatty acid esters. The amount of the component (c) in the undiluted solution should be appropriately set, and is, for example, 0.3% by mass or more and 5% by mass or less.

  Inclusion of one or more types of higher alcohols (hereinafter sometimes referred to as “component (d)”) in the stock solution of the present embodiment is suitable for making the foam fine (the linear chain described below). It is particularly preferred to use a saturated saturated alcohol). A monohydric alcohol having 16 to 22 carbon atoms may be contained in the stock solution as the component (d). Examples of such a component (d) include linear saturated alcohols such as cetyl alcohol, stearyl alcohol, and behenyl alcohol; Examples include linear unsaturated alcohols such as oleyl alcohol; branched saturated alcohols such as octyldodecanol and isostearyl alcohol. When the component (d) is blended in the stock solution, the amount in the stock solution is preferably 3.0% by mass or less and preferably 2.0% by mass or less in order to improve the ease of stretching the foam.

pH
The pH of the stock solution of the present embodiment at 20 ° C. is preferably 7.0 or more, preferably 7.5 or more and 9.0 or less, and 8.0 in order to improve the emulsification stability and foamability of the component (a). More preferably, it is 8.8 or less.

(Propellant)
A propellant fills a container in order to eject a stock solution as a foam.

  The propellant of this embodiment is good in it being 1 type, or 2 or more types selected from the propellant with which a well-known foamable aerosol product is filled. Examples of the propellant include liquefied petroleum gas (LPG), dimethyl ether (DME), and carbon dioxide gas mainly composed of propane, n-butane, i-butane, and the like. The filling amount of the propellant into the container is preferably 1% by mass or more and 15% or less, and preferably 3% by mass or more and 12% by mass or less with respect to the total amount of the stock solution and the propellant. By setting the content to 1% by mass or more and 15% by mass or less, the foamability and fineness of the foam are improved.

  In addition, when using DME as a propellant, it is good to use LPG together in order to improve foamability and elasticity of the foam (the amount of LPG in the total amount of the injected gas in this case is preferably 30% by mass or more). 50 mass% or more is more preferable.) Moreover, since emulsification tends to become unstable when the stock solution becomes acidic, it is better not to include a large amount when filling with a gas that lowers the pH of the stock solution, such as carbon dioxide.

(Use)
The foamable aerosol product of the present embodiment may be used for the same application as a known foamable aerosol product. When a known hair styling material is blended in the stock solution, it may be used for hair styling. For example, as disclosed in Japanese Patent Application Laid-Open No. 2012-56850, a wave shape becomes clear when applied to dry hair to which a wave shape has been imparted by permanent wave treatment. As described above, when the foam of the foamable aerosol product of the present embodiment is applied to the hair, since the stock solution contains the components (a) and (b), the conformability of the foam to the hair is good.

  EXAMPLES Hereinafter, although this invention is explained in full detail based on an Example, this invention is not interpreted limitedly based on description of this Example.

  The foamable aerosol products of Examples and Comparative Examples were manufactured, and the “smoothness of hand stretching” and “familiarity with hair” were evaluated for foams ejected from these products. Details are as follows.

(Foaming aerosol products)
Foamable aerosol products of Examples and Comparative Examples filled with a stock solution (described later in detail) and LPG as a propellant were produced. The mass ratio of the stock solution to the propellant in the filling was 93: 7. Moreover, it was 0.3 MPa when the injection pressure from the product in 25 degreeC after filling was confirmed.

  The stock solution is prepared by mixing an oil phase blended with a raw material at 70 to 80 ° C. with an aqueous phase blended with the raw material at 70 to 80 ° C. (the amount of water is about 55% by mass in the stock solution), and further adding water. And methylisothiazolinone. The raw materials used for the stock solution preparation are as shown in Tables 1 to 4 below: 2-amino-2-methyl-1-propanol, hydroxyethyl cellulose (“HEC Daicel SE850” manufactured by Daicel Finechem), methyl methyl ether of hydroxyethyl cellulose Hydroxyethylcellulose (INCI Name: Methyl Hydroxyethylcellulose), sodium carboxymethylcellulose (“CMC Daicel 1330” manufactured by Daicel Finechem), hydroxypropylcellulose (“HPC-H” manufactured by Nippon Soda Co., Ltd.), methylcellulose (“Metroses SM8000 manufactured by Shin-Etsu Chemical Co., Ltd.) ”), Propylene glycol, higher fatty acid (combination of myristic acid and isostearic acid), polyoxyethylene hydrogenated castor oil, polyoxyethylene cetyl ether, myristyl alcohol, ethyl Alkyl hexanoate, shea butter, decamethylcyclopentasiloxane, and PEG-4. Moreover, the mixing | blending density | concentration of the raw material when a stock solution shall be 100 mass% is as Tables 1-4 below.

(Evaluation of “smoothness of hand reaching” in foam)
The foams ejected from any of the foamable aerosol products of Examples and Comparative Examples were subjected to a comparative evaluation of the feel when the palms of both hands were slid while being sandwiched between the palms of both hands. Here, the comparison in Examples 1a to 1b and Comparative Examples 1a to 1d shown in Table 1 below is based on Comparative Example 1b, and the comparison in Examples 2a to 2b and Comparative Example 2 shown in Table 2 below is Example 2a. In the comparison in Examples 3a to 3b and Comparative Examples 3a to 3b shown in Table 3 below, Example 3a was used as a reference, and in the comparison in Examples 4a to 4e shown in Table 4 below, Example 4a was used as a reference. The evaluation criteria were as follows.
○: The touch was smoother than the standard.
-: Smoothness equivalent to the standard.
X: The feeling of smoothness was inferior to a reference | standard.

(Evaluation of “familiarity with hair” in the form)
For foams spouted from any of the foamable aerosol products of Examples and Comparative Examples, the familiarity when applied to hair was comparatively evaluated. Here, a comparison similar to the above-described “evaluation of“ smoothness of hand stretching ”of foam” was performed. The evaluation criteria were as follows.
○: The disappearance of the foam was faster than the standard, and the familiarity with the hair was good.
-: Familiarity with hair equivalent to the standard.
X: The disappearance of the foam was slower than the standard, and the familiarity with the hair was inferior.

Tables 1 to 4 below show the results of evaluating foams of the product together with the mixing ratio of the raw materials in the stock solution used in the production of the foamable aerosol product.

  In Table 1, it can confirm that Example 1a-1b containing a component (b) had all the evaluation results favorable rather than the comparative examples 1a-1d which do not contain a component (b).

  From the comparison between Example 3a and Example 3b in Table 3, it can be confirmed that the amount in the case of blending the higher alcohol as the component (d) may be reduced for smoothness of hand stretching. In addition, about Comparative Examples 3a-3b which does not contain a component (a), since the emulsification failure of the undiluted | stock solution was confirmed, foam was not evaluated.

  In Table 4, it can be confirmed that the amount of the component (b) in the stock solution is preferably about 0.01% by mass or more and 0.5% by mass or less.

Claims (7)

A foamable aerosol product having a container filled with a stock solution and a propellant,
The stock solution, (a) a higher fatty acid-based anionic surfactant, (b) hydroxyethyl cellulose, methyl ether of hydroxyethyl cellulose, and one or two or more of hydroxyethyl cellulose polymer selected from ethyl ether hydroxyethyl cellulose, ( c) nonionic surfactant, and (d) all SANYO containing higher alcohol,
PH of the stock solution is 7.0 or more and 9.0 or less,
The propellant contains liquefied petroleum gas;
The stock solution and foaming aerosol products foam produced by the propellant is jetted from the container, characterized in Rukoto used by applying to the hair. 2. The foamable aerosol product according to claim 1, wherein (a) the higher fatty acid constituting the higher fatty acid anionic surfactant has 14 to 20 carbon atoms. The foamable aerosol product according to claim 1 or 2 , wherein (d) the higher alcohol is 3.0% by mass or less in the stock solution. The foamable aerosol product according to any one of claims 1 to 3 , wherein in the stock solution, the (b) hydroxyethyl cellulose polymer is 0.5 mass% or less.   The foamable aerosol product according to claim 4, wherein in the stock solution, the (b) hydroxyethyl cellulose-based polymer is 0.03% by mass or more and 0.2% by mass or less.   The foamable aerosol product according to any one of claims 1 to 5, wherein the pH of the stock solution is 8.0 or more and 9.0 or less.   The foamable aerosol product according to any one of claims 1 to 6, wherein the stock solution contains 70% by mass or more of water.