JP4822836B2 - Aerosol composition - Google Patents

Description

  The present invention relates to an aerosol composition that provides a lasting cooling effect.

  Aerosol-type coolant is used to cool the body after sports, injuries such as bruises and sprains.

  As such a cooling agent for the body, for example, a liquefied gas or a liquefied gas and a low-boiling-point coolant are sealed in an aerosol container, and the volatile component is volatilized by spraying it on a part of the body. The one that cools the body by latent heat of vaporization is known. However, such a coolant has a drawback that the cooling effect is small because the retention time of the volatile components on the body is short and the duration of the effect is short.

  As a cooling agent having a long cooling duration, a composition comprising an aerosol water-containing stock solution and an aerosol propellant having a boiling point of 5 ° C. or less, wherein a part or almost all of the aerosol propellant is emulsified or dispersed in the aerosol water-containing stock solution. Is known (see Patent Document 1 and Patent Document 2 below). When such an aerosol composition is sprayed onto the application surface, a part or almost all of the water-containing stock solution cooled by the heat of vaporization of the propellant adheres to the application surface in the form of icing or snow accumulation, and is long on a specific site. It is said that it can give a cool feeling for a period.

Further, (A) a propellant consisting of liquefied petroleum gas, dimethyl ether or a mixed gas thereof, the vapor pressure of which is ² to 5 kg / cm ² at 20 ° C., and (B) water and a lower alcohol having an equivalent weight or less An external aerosol composition comprising a mixture or a stock solution comprising water is known (see Patent Document 3 below). This aerosol composition is also intended to produce a cooling effect by ejecting a sherbet-like foam.

  However, all of the above-mentioned coolants are not efficient for cooling the human body because the heat of vaporization of the propellant is often used not only to cool the human body but also to freeze the hydrated stock solution. There is a disadvantage that the duration of the effect is short.

Furthermore, a coolant that contains a resin component and a volatile component and that functions as a propellant, such as a liquefied gas, as a volatile component and sealed in an aerosol container is also known (see Patent Document 4 below). As this coolant is sprayed onto the member to be cooled, a resin film is applied onto the member to be cooled, and volatile components are volatilized from the surface and / or inside of the resin film, and the member to be cooled is caused by latent heat of vaporization at that time. It is what cools. However, although this coolant is said to have a large cooling effect, its cooling power is not satisfactory.
Japanese Patent No. 2960445 Japanese Patent No. 3439672 Japanese Patent No. 2903708 JP 2001-2558921 A

  The present invention has been made in view of the above-described problems of the prior art, and its main purpose is to provide an aerosol type coolant having an excellent cooling effect and excellent sustainability of the cooling effect. That is.

  The present inventor has intensively studied to achieve the above-described object. As a result, an aqueous solution containing a lower alcohol, a surfactant, and a water-soluble polymer in specific ratios is used as an aerosol stock solution, and at least one component selected from the group consisting of liquefied petroleum gas and dimethyl ether is used as a propellant to identify these. According to the aerosol composition mixed at a ratio of, the discharged material sprayed on the application part becomes a gel-like material contained in the aerosol stock solution without vaporizing a large amount of the propellant, and by touching the human body The propellant gradually vaporized, and the cooling effect was found to last for a long time, and the present invention was completed here.

That is, the present invention provides the following aerosol composition.
1.
(A) An aerosol stock solution containing 50% by weight or more of water, 10 to 40% by weight of a lower alcohol, 0.05 to 5% by weight of a surfactant, and 0.05 to 5% by weight of a water-soluble polymer compound;
(B) an aerosol propellant comprising at least one component selected from the group consisting of liquefied petroleum gas and dimethyl ether;
(A) :( B) = Aerosol composition formed by mixing at a weight ratio of 15:85 to 50:50.
2. Item 2. The aerosol composition according to Item 1, wherein the surfactant is a nonionic surfactant and the water-soluble polymer compound is a cellulose polymer compound.
3. The aerosol composition according to item 1 or 2, wherein the vapor pressure at 20 ° C is 0.2 to 0.6 MPa.
4). The coolant which consists of an aerosol composition in any one of said claim | item 1-3.

  The aerosol composition of the present invention comprises (A) 50% by weight or more of water, 10 to 40% by weight of a lower alcohol, 0.05 to 5% by weight of a surfactant, and 0.05 to 5% by weight of a water-soluble polymer. Mixing aerosol stock solution and aerosol propellant consisting of at least one component selected from the group consisting of (B) liquefied petroleum gas and dimethyl ether in a weight ratio of (A) :( B) = 15: 85-50: 50 It is made. Hereinafter, the aerosol composition of the present invention will be specifically described.

(A) Aerosol Stock Solution (1) Lower Alcohol Lower alcohol is mainly blended for the purpose of preventing the sprayed product from becoming frozen and further obtaining an antifoaming effect. As the lower alcohol, a monohydric alcohol having an alkyl group having 1 to 4 carbon atoms such as methanol, ethanol, n-propanol, i-propanol, n-butanol and i-butanol can be used. A lower alcohol can be used individually by 1 type or in mixture of 2 or more types.

  The proportion of the lower alcohol in the aerosol stock solution is about 10 to 40% by weight, preferably about 15 to 35% by weight. If the blending amount of the lower alcohol is insufficient, the aerosol stock solution freezes or foams, making it difficult to obtain a sustainable cooling effect. On the other hand, when the amount of the lower alcohol is too large, the stability of the mixture of the aerosol stock solution and the propellant is lowered, and strong agitation is required for each use, which is not preferable.

(2) Surfactant The surfactant mainly serves to improve the stability of the mixture of aerosol stock solution and aerosol propellant.

The surfactant can be used without particular limitation as long as it can stably emulsify and disperse the propellant in the aerosol stock solution. Specific examples of such surfactants include propylene glycol fatty acid esters, glycerin fatty acid esters, polyoxyethylene glycerin fatty acid esters, polyglycerin fatty acid esters, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene sorbit fatty acid esters. , Polyoxyethylene castor oil, polyoxyethylene hydrogenated castor oil, polyoxyethylene sterol, polyoxyethylene hydrogenated sterol, polyethylene glycol fatty acid ester, polyoxyethylene alkyl ether (such as polyoxyethylene stearyl ether), polyoxypropylene alkyl ether , Polyoxyethylene lanolin, polyoxyethylene lanolin alcohol, polyoxyethylene beeswax derivatives Nonionic surfactants such as polyoxyethylene alkylamine, polyoxyethylene fatty acid amide, fatty acid alkanolamide, polyoxyethylene polyoxypropylene alkyl ether; polyoxyethylene alkyl ether phosphate, polyoxyethylene alkyl ether phosphate, Polyoxyethylene alkyl ether sulfates (Na, K, ammonium salts, etc.), C ₁₂ -C ₂₀ alkyl ether carboxylates, sulfonates of C ₁₂ -C ₂₀ higher fatty acid esters (eg dioctyl sodium sulfosuccinate, lauryl sulfo) such as sodium _acetate), alkyl phosphates C 12 _{-C 20,} alkyl sulfates C 12 _{-C 20,} acyl amino acid _salts, anionic surfactants such as higher alcohol sulfuric acid ester salts of C 12 _{-C 20} It can be shown.

  Among these, surfactants with particularly low foaming properties are preferred, and nonionic interfaces such as polyoxyethylene castor oil, polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene polyoxypropylene alkyl ether, etc. An activator is preferred.

  The mixing ratio of the surfactant in the aerosol stock solution may be about 0.05 to 5% by weight, preferably about 0.2 to 3% by weight. If the amount of the surfactant is insufficient, the stability of the mixture of the aerosol stock solution and the propellant is deteriorated, which is not preferable. On the other hand, when there is too much compounding quantity of surfactant, foaming will become large and a propellant will volatilize easily and sufficient cooling effect cannot be acquired.

(3) Water-soluble polymer compound The water-soluble polymer compound is a component that mainly serves to adhere the sprayed stock solution to the coated surface as a gel-like material containing a propellant.

  Examples of water-soluble polymer compounds include cellulose-based polymer compounds such as hydroxyethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, sodium carboxymethylcellulose, crystalline cellulose, xanthan gum, carrageenan, gum arabic, cationized guar gum, gellan gum, locust bin gum, and the like. A gum polymer compound or the like can be used. Of these, cellulose polymer compounds are particularly preferable.

  The mixing ratio of the water-soluble polymer compound may be about 0.05 to 5% by weight in the aerosol stock solution, and is preferably about 0.1 to 3% by weight. When the blending amount of the water-soluble polymer compound is insufficient, the time for holding the propellant in the gel stock solution is shortened, and the sustainability of the cooling effect is insufficient. On the other hand, when the amount of the water-soluble polymer compound is too large, the feeling in use is deteriorated, which is not preferable.

(4) Water In the aerosol solution, the water content is about 50% by weight or more. By setting the water content to about 50% by weight or more, it is possible to form a good gel-like product that encloses a propellant when sprayed onto an object to be coated.

  It does not specifically limit as water, Arbitrary things, such as a tap water, distilled water, ion-exchange water, and an ultrapure water, can be used.

(B) Aerosol propellant In the aerosol composition of the present invention, as the propellant, at least one selected from the group consisting of liquefied petroleum gas and dimethyl ether is used. By using such a propellant, the propellant contained in the gel-like material adhering to the coated surface is gradually vaporized, and the cooling effect can be exhibited for a long time.

Aerosol composition The aerosol composition of the present invention comprises (A) 50% by weight or more of water, 10 to 40% by weight of a lower alcohol, 0.05 to 5% by weight of a surfactant, and 0 water-soluble polymer. 0.05 to 5% by weight of aerosol stock solution and (B) an aerosol propellant composed of at least one component selected from the group consisting of liquefied petroleum gas and dimethyl ether. These components can be obtained by enclosing them in a known aerosol container.

  The weight ratio of the aerosol stock solution (A) and the aerosol propellant (B) needs to be about (A) :( B) = 15: 85-50: 50, and (A) :( B) = 20 : It is preferable to set it as about 80-30: 70. When the ratio of the aerosol stock solution is too small, the stock solution is likely to freeze, and it is difficult to form a gel-like material enclosing the propellant. On the other hand, if the ratio of the aerosol stock solution is too large, the amount of the propellant is insufficient and a sufficient cooling effect cannot be obtained, and further, the stability of the mixture of the stock solution and the propellant is lowered and foaming tends to occur. Therefore, it is not preferable.

  The composition in a state where the aerosol stock solution and the aerosol propellant are mixed preferably has a vapor pressure at 20 ° C. of about 0.2 to 0.6 MPa, more preferably about 0.25 to 0.4 MPa. When the vapor pressure of the mixture is within the above-described range, it is possible to form a good gel-like product in a state where the propellant is wrapped on the coating surface. If the vapor pressure is too low, it may not be possible to inject at low temperatures. If the vapor pressure is too high, the injection force is too strong, and the sprayed product will scatter or foam, resulting in a good gel. Is not preferable because it may not be formed.

  When using the aerosol composition of the present invention, it is usually sufficient to shake the aerosol container containing the composition sufficiently to mix the contents uniformly, and then spray the mixture onto the coated surface. The composition of the present invention tends to thicken by shaking the aerosol container and mixing the contents to form a stable mixture in which the propellant is uniformly emulsified and dispersed in the stock solution. For this reason, it becomes the stable state which the propellant uniformly disperse | distributed in the undiluted | stock solution, and it becomes easy to form the favorable gel-form thing which wrapped the propellant.

  When the aerosol composition of the present invention is used, for example, on the human body, the contents of the aerosol container may be sprayed onto the application target part of the human body, for example, the palm, the fingers, the back of the hand, the sole of the foot, and the like. As a result, the aerosol stock solution can be attached to each part of the human body as a gel-like material enclosing the propellant. According to the aerosol composition of the present invention, even when the contents become foamy when sprayed onto the application target site, the foam usually disappears within about 60 seconds to become a gel, The effect to hold is demonstrated. The gel-like material formed in this manner is in a state of enveloping a large amount of propellant, and the propellant is gradually vaporized by touching the human body to exert a cooling effect. For this reason, according to the aerosol composition of this invention, compared with the case where the conventional aerosol undiluted | deposited solution adheres to an application surface in the form of freezing or snow, a cooling effect can be exhibited for a long period of time.

  In the aerosol composition of the present invention, when the contents of the aerosol container are sprayed onto the application surface, the discharged material becomes a gel shape enclosing the propellant. When the gel-like material formed in this manner is left in contact with the human body, the propellant is gradually vaporized from the gel-like material, thereby providing a cooling effect that lasts for a long time.

  Therefore, when the aerosol composition of the present invention is used as a coolant for the purpose of cooling the body after sports, injuries such as bruises and sprains, an excellent cooling effect can be exhibited for a long period of time. .

  Hereinafter, the present invention will be described in more detail with reference to examples.

Example 1
An aerosol stock solution having a blending ratio shown in Table 1 below was prepared, and liquefied petroleum gas (LPG) was used as a propellant and sealed in an aerosol container at a weight ratio shown in Table 1 to obtain an aerosol composition. In addition, as a polyoxyethylene (POE) hydrogenated castor oil, trade name: Nikkor HCO-50 (POE 50 mol) manufactured by Nikko Chemicals Co., Ltd. was used.

The cooling effect of each aerosol composition described above was evaluated by the following test method.
Test Method A digital thermometer (YOGAWA IM2455) was attached to the arm of an adult male (20's or 30's), and each aerosol composition was sprayed on that portion for 1 second. Thereafter, the temperature at the injection site was measured over time. In addition, the body temperature of the injection part before apply | coating an aerosol composition was 32 degreeC. The results are shown in Table 2 below. The measured value is an average of three times.

  As is clear from the above results, the aerosol compositions of Examples 1 and 2 exhibited an excellent cooling effect immediately after ejection, and continued to exhibit the cooling effect even after 300 seconds had elapsed.

In contrast, in the aerosol composition of Comparative Example 1 using a stock solution with a low ethanol content, the discharge was a sherbet and the initial cooling effect was good, but the sustainability of the cooling effect was poor. It was. In addition, the compositions of Comparative Example 2 with a large amount of surfactant and Comparative Example 4 with a large amount of water-soluble polymer compound are both foamed, and the initial cooling effect and the cooling effect are maintained. The properties were all inferior. Further, the composition of Comparative Example 3 in which the ratio of the stock solution to the propellant was large was poor in stability of the mixture and became a gel-like product containing a large amount of foam, and in particular, the initial cooling effect was inferior.

Claims (4)

(A) Water 50 wt% or more of ethanol 20-30% by weight, nonionic surfactant 0.2 to 3 wt%, and the aerosol stock solution containing hydroxyethyl cellulose 0.1-3 wt%,
(B) a liquefied petroleum gas or Ranaru aerosol propellants,
(A) :( B) = 20 : 80~30: 70 Ri Na were mixed in a weight ratio of the aerosol composition discharged product is gel-like material. The aerosol composition according to claim 1, wherein the nonionic surfactant is polyoxyethylene hydrogenated castor oil or polyoxyethylene sorbitan fatty acid ester. The aerosol composition according to claim 1 or 2, wherein the vapor pressure at 20 ° C is 0.2 to 0.6 MPa. A coolant comprising the aerosol composition according to any one of claims 1 to 3 .