JP7085356B2 - Aerosol hair cosmetics - Google Patents

Description

The present invention relates to an aerosol-type hair cosmetic that can contain a large amount of an oil agent in an undiluted solution and can easily impart a treatment function and the like in addition to maintaining a hairstyle.

Conventionally, acrylic resins have been used to impart setting force to aerosol-type hair cosmetics, but the hairstyle could not be maintained when exposed to sweat or water. Therefore, an aerosol spray containing a polyurethane-containing hair-regulating composition has been proposed for the purpose of maintaining a hairstyle even when exposed to rain, sweat, or the like for a long time (Patent Document 1).

The aerosol sprays described in Patent Document 1 have (a) at least one propellant and (b) at least a number average molecular weight between 400,000 and 500,000 in a water-containing cosmetically acceptable medium. A composition for cosmetic treatment of a keratin substance packaged in an aerosol device is used, which comprises a composition for hair containing one type of polyurethane.

Japanese Unexamined Patent Publication No. 2006-124390

The aerosol spray described in Patent Document 1 uses a specific polyurethane as a fixing agent for maintaining a hairstyle in order to improve water resistance. Since the polyurethane is water-soluble, it is necessary to add water to the composition (undiluted solution). It is difficult to add an oil agent to a polyurethane composition containing water as a solvent from the viewpoint of stability and uniform ejection property of the polyurethane composition. For this reason, it has been difficult to impart a function such as a treatment function to the aerosol spray hair cosmetic (aerosol-type hair cosmetic) in addition to the function of retaining the hairstyle.

Therefore, an object of the present invention is to provide an aerosol-type hair cosmetic that can easily mix an oil agent in an undiluted solution and can impart a treatment function and the like in addition to maintaining a hairstyle.

The configuration provided in the present invention for solving the above problems is as follows.
[1] The undiluted solution contains polyurethane-64 , a lower alcohol having 2 to 3 carbon atoms , and an oil agent , and the content of the polyurethane-64 in 100 parts by mass of the undiluted solution is 0.1 to 1. An aerosol-type hair cosmetic having a content of 2.0 parts by mass, a content of the lower alcohol of 20 parts by mass or more, and a content of the oil agent of 10 to 70 parts by mass .
[2] The aerosol-type hair cosmetic according to [1], wherein the polyurethane-64 is blended as a water-free alcohol solution.

[3 ] The aerosol-type hair cosmetic according to [ 1 ], wherein the oil agent contains an ester oil, and the content of the ester oil in 100 parts by mass of the undiluted solution is 15 to 70 parts by mass.
[ 4 ] The aerosol-type hair cosmetic according to [ 3 ], wherein the ester oil is isopropyl palmitate.

[5 ] The aerosol-type hair cosmetic according to any one of [ 1] to [4 ], wherein the undiluted solution does not contain water.
[ 6 ] The aerosol-type hair cosmetic according to [ 5 ], wherein the undiluted solution does not contain an emulsifier.

By using alcohol-soluble polyurethane as the polyurethane for maintaining the hairstyle, it becomes possible to mix a large amount of oil in the undiluted solution. Therefore, it is possible to provide an aerosol-type hair cosmetic having a treatment function in addition to maintaining a hairstyle.

The aerosol-type hair cosmetic of the present invention (hereinafter, appropriately referred to as "hair cosmetic") is an aerosol preparation used for setting hair and improving the texture by discharging the contents composed of a stock solution and a propellant.

(Aerosol preparation)
The aerosol preparation is a preparation in which the undiluted solution is sprayed with the pressure of a propellant such as liquefied gas or compressed gas to apply a required amount to the target portion. In the aerosol-type hair cosmetics, a desired amount of the undiluted solution can be easily applied to the target site by injecting the content composed of the undiluted solution and the propellant into a mist or foam. From the viewpoint of keeping the hairstyle in a preferable hairstyle (hair quality), aerosol-type hair cosmetics are required to have a short drying time and less flaking in which the polymer component contained in the undiluted solution becomes white.

(Undiluted solution)
The undiluted solution of aerosol-type hair cosmetics contains alcohol-soluble polyurethane and alcohol.
(Alcohol-soluble polyurethane)
By using polyurethane as a hairstyle-retaining component, the undiluted solution has higher water resistance than acrylic resin, which is generally used as a hairstyle-retaining component, and can give a soft texture to the hair. It becomes a cosmetic for use. Further, by using alcohol-soluble polyurethane, a water-free stock solution for dissolving a polymer component for imparting a hairstyle retention function can be obtained.

In the present invention, "alcohol-soluble" means having a property of being uniformly dissolved in ethanol. The alcohol-soluble polyurethane is preferably dissolved in 100 g of ethanol at 25 ° C. in an amount of 30 g or more, and more preferably 35 g or more, from the viewpoint of making a stock solution containing no water.

In the present invention, "water-free" means that it does not contain an amount of water useful as a solvent. For example, when water is contained as an impurity in the alcohol used as a solvent for alcohol-soluble polyurethane, the undiluted solution is "water-free". Normally, if the amount of water contained in the undiluted solution is 5% by volume or less, it can be said that it does not contain water.

By using alcohol-soluble polyurethane, a water-free stock solution can be obtained. This reduces the time required for the undiluted solution to dry after being sprayed onto the scalp. Since the hair cosmetics of the type in which the undiluted solution is sprayed in a mist form are often used as a finish for hair styling, shortening the drying time is particularly beneficial for improving usability.

Examples of the alcohol-soluble polyurethane include polyurethane-14, polyurethane-32, polyurethane-34, polyurethane-35, polyurethane-48 and polyurethane-64 (all of which are cosmetic labeling names). Among these, polyurethane-64, which is an ethanol solution of alcohol-soluble polyurethane and does not contain water, is preferable from the viewpoint of stability of an aerosol-type hair cosmetic containing a stock solution containing an oil agent.

Products containing alcohol-soluble polyurethane include BAYCUSAN C2000 (polyurethane-64 ethanol solution), BAYCUSAN C1003 (polyurethane-32 aqueous dispersion), BAYCUSAN C1000 (polyurethane-34 aqueous dispersion), BAYCUSAN C1001 (polyurethane-). 34 water dispersion), BAYCUSAN C1004 (polyurethane-35 water dispersion), BAYCUSAN C1008 (polyurethane-48 water dispersion) (Cobestro Japan Co., Ltd.), Dynamics (polyurethane-14 water alcohol dispersion (Axo) Nobel Co., Ltd.)), etc.

The content of alcohol-soluble polyurethane in 100 parts by mass of the undiluted solution is preferably 0.1 to 2.0 parts by mass, preferably 0.2 to 1.5 parts by mass, from the viewpoint of imparting elasticity to the hair and maintaining the hairstyle. The above is more preferable, and 0.4 to 1.2 parts by mass is further preferable. In the present invention, "A to B" means A or more and B or less.

The solubility of the alcohol-soluble polyurethane in ethanol at 25 ° C. is preferably 10 to 50%, more preferably 23 to 48%, still more preferably 35 to 45%.

(alcohol)
As the alcohol, those that can be used as cosmetics in a liquid state at 25 ° C., for example, lower alcohols having 2 to 3 carbon atoms such as ethanol and isopropanol can be used. Of the exemplified alcohols, ethanol is preferred because of its high volatility and short drying time. Only one type of alcohol may be used, or two or more types of alcohol may be mixed and used.

From the viewpoint of suppressing the precipitation of alcohol-soluble polyurethane, the content of alcohol in 100 parts by mass of the undiluted solution is preferably 10 to 90 parts by mass, more preferably 20 to 85 parts by mass, and even more preferably 30 to 80 parts by mass.

(Oil)
Since the polyurethane contained in the undiluted solution is alcohol-soluble, it is easy to use an oil agent in combination. The oil agent may be any oily component that can be blended in cosmetics and is liquid at room temperature (25 ° C.). For example, silicone oils such as methylpolysiloxane (dimethicone), phenyltrimethicone, cyclopentasiloxane, ester oils such as isopropyl palmitate, isopropyl myristate, diisopropyl sebacate, isodecyl neopentanoate, isononyl isononanoate, squalane, jojoba oil, etc. Examples thereof include animal and vegetable oils such as camellia oil, liquid paraffins, squalanes, and aliphatic hydrocarbons such as hydrogenated polyisobutene. Ester oil is preferable from the viewpoint of improving the gloss and slipperiness of the hair. These may be used alone or as a mixture of two or more.

The lower limit of the content of the oil in 100 parts by mass of the undiluted solution is preferably 20 parts by mass or more, more preferably 30 parts by mass or more, and 40 parts by mass, from the viewpoint of imparting a sufficient treatment function and improving the gloss and slipperiness of the hair. More than parts by mass is more preferable. From the viewpoint of improving the storage stability of the undiluted solution, 90 parts by mass or less is preferable, 80 parts by mass or less is more preferable, and 70 parts by mass or less is further preferable.

When the oil agent contains an ester oil, the content of the ester oil in 100 parts by mass of the undiluted solution is preferably 10 to 70 parts by mass, more preferably 13 to 60 parts by mass, and 18 to 50 parts by mass from the viewpoint of imparting a treatment function. Parts by mass are more preferred. Preferred ester oils include, for example, isopropyl palmitate.

As described above, since polyurethane used as a hairstyle-retaining component (fixing agent) is alcohol-soluble, it can be used as a stock solution containing alcohol and not water. Since the undiluted solution does not contain water, it is possible to obtain a highly stable aerosol-type hair cosmetic that can be blended with the undiluted solution at a high concentration of an oil agent having a high compatibility with alcohol. Since the oil agent can be blended in the undiluted solution at a high concentration, it is easy to impart a treatment function or the like to improve the texture imparted to the hair.

As described above, from the viewpoint of improving usability by shortening the drying time during use, the undiluted solution preferably does not contain water, but contains water to the extent that it does not adversely affect usability. May be. The degree to which the usability is not adversely affected depends on other ingredients, but if the content in 100 parts by mass of the undiluted solution is 5 parts by mass or less, the adverse effect on the usability is usually small.

(Other ingredients)
In addition to the above-mentioned components, the undiluted solution may contain components generally used in the fields of pharmaceuticals and cosmetics. Such components include emulsifiers; pH regulators such as citric acid and sodium citrate; preservatives such as phenoxyethanol, sodium benzoate and parabens; lubricants such as bead polymers; moisturizing sodium pyrrolidone carboxylates, glycerin and the like. Agents; vitamins; inorganic fillers; fragrances; etc. The content of these components may be within a range that does not adversely affect the characteristics of the aerosol-type hair cosmetics.

(Spray agent)
As the propellant to be filled in the container together with the undiluted solution, commonly used liquefied gas, compressed gas, a mixture thereof and the like can be used. Examples of the liquefied gas include liquefied petroleum gas, dimethyl ether, HFC-152a, HFO-1234ze (E) and the like, and examples of the compressed gas include carbon dioxide gas, nitrogen, nitrous oxide, compressed air and the like.

The propellant may be used alone or in combination of two or more. The content (mass) ratio (stock solution / propellant) of the undiluted solution and the propellant is preferably 30/70 to 70/30, more preferably 35/65 to 65/35, and further preferably 40/60 to 60/40. preferable.

(container)
As the container for filling the undiluted solution and the propellant, a pressure-resistant container made of a generally used metal or resin can be used. Examples of the metal include aluminum, an aluminum alloy, tinplate, steel and the like, and examples of the resin include PET and the like.

Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited thereto. The numbers in the table indicate parts by mass.

Table 1 shows the blending amounts of the components used in each of the undiluted solutions of sample numbers 1 to 7.
Each component shown in Table 1 was uniformly mixed at room temperature (25 ° C.) to prepare undiluted solutions of sample numbers 1 to 7, respectively. In addition, polyurethane-64 in Table 1 shows the blending amount of polyurethane-64 contained in a 40% ethanol solution (the same applies to Table 2).

In the examples, the following were used as the components of each undiluted solution.
(Alcohol-soluble polyurethane)
Polyurethane-64: BAYCUSAN C2000 (Product name, Covestro Japan Co., Ltd., 40% ethanol solution of polyurethane-64)
(alcohol)
Ethanol (oil)
Isopropyl palmitate, light liquid isoparaffin

[Evaluation method]
Each undiluted solution and a propellant shown in Table 1 were filled in a container at a ratio of 50/50 to prepare an aerosol-type hair cosmetic. Dimethyl ether (DME) was used as the propellant.
Table 1 shows the results of spraying an aerosol-type hair cosmetic into a mist toward the hair and evaluating the firmness, luster, and slip of the hair using the following criteria.
[Texture of hair (tension, luster, slip)]
○: Good △: Somewhat good ×: Bad

From the results in Table 1, the following can be seen.
From the viewpoint of giving firmness to the hair, the content of polyurethane-64 in 100 parts by mass of the undiluted solution is preferably 0.2 parts by mass or more, more preferably 0.4 parts by mass or more. From the viewpoint of giving firmness to the hair, the content of isopropyl palmitate in 100 parts by mass of the undiluted solution is preferably 19 parts by mass or more.

Table 2 shows the blending amount (parts by mass) of the components used in each undiluted solution from sample number 8.
Each component shown in Table 2 was uniformly mixed at room temperature (25 ° C.) to prepare undiluted solutions of sample numbers 8 to 13, respectively.

[Evaluation method]
Each undiluted solution shown in Table 1 was filled in a container at a ratio of 50/50 to prepare an aerosol-type hair cosmetic. Dimethyl ether (DME) was used as the propellant. Table 2 shows the results of evaluation of the state of the undiluted solution in the transparent container using the following criteria.
[State of undiluted solution (precipitation)]
◯: No precipitation was observed in the undiluted solution 1 day after preparation.
Δ: Precipitation was observed in the undiluted solution 1 day before the preparation.
X: Precipitation was observed immediately after preparation.

The following can be seen from the results in Table 1.
From the viewpoint of suppressing the precipitation of alcohol-soluble polyurethane, the content of ethanol in 100 parts by mass of the undiluted solution is preferably 20 parts by mass or more, more preferably 30 parts by mass or more. From the same viewpoint, the content of the oil agent in 100 parts by mass of the undiluted solution is preferably 80 parts by mass or less, more preferably 70 parts by mass or less.

INDUSTRIAL APPLICABILITY The present invention is useful as an aerosol-type hair cosmetic that can impart a treatment effect and the like in addition to maintaining a hairstyle.

Claims (6)

The undiluted solution contains polyurethane-64 , a lower alcohol having 2 to 3 carbon atoms , and an oil agent .
In 100 parts by mass of the undiluted solution,
The content of the polyurethane-64 is 0.1 to 2.0 parts by mass, and the content is 0.1 to 2.0 parts by mass.
The content of the lower alcohol is 20 parts by mass or more, and the content is 20 parts by mass or more.
The content of the oil is 10 to 70 parts by mass.
Aerosol-type hair cosmetics. The polyurethane-64 is blended as a water-free alcohol solution.
The aerosol-type hair cosmetic according to claim 1. The oil agent contains ester oil and
The content of the ester oil in 100 parts by mass of the undiluted solution is 15 to 70 parts by mass.
The aerosol-type hair cosmetic according to claim 1 . The ester oil is isopropyl palmitate,
The aerosol-type hair cosmetic according to claim 3 . The aerosol-type hair cosmetic according to any one of claims 1 to 4 , wherein the undiluted solution does not contain water. The aerosol-type hair cosmetic according to claim 5 , wherein the undiluted solution does not contain an emulsifier.