JP2019064971A - Aerosol product - Google Patents

Abstract

To provide an aerosol product filled with an emulsion prepared without using an emulsifier (surfactant).SOLUTION: The present invention provides an aerosol product filled with an emulsion containing an oil phase containing an oil content and an aqueous phase, and a propellant, the emulsion being free of an emulsifier.SELECTED DRAWING: None

Description

  The present invention relates to an aerosol product filled with an emulsion made without an emulsifier.

Emulsions are widely used in foods, cosmetics, pharmaceuticals and the like, and it is widely known that surfactants are used as emulsifiers for the stabilization of dispersion of the emulsion. On the other hand, in recent years, due to the increase in natural orientation, in order to reduce the burden on the human body, a demand for an emulsifier (surfactant) free product is increasing.
For example, Patent Document 1 proposes a technique of adding a surface-inert substance as a water-soluble additive for dispersing and stabilizing an emulsion in an oil-in-water (O / W) emulsion in which the dispersoid is oil and the dispersion medium is water. It is done.

JP, 2016-165716, A

As mentioned above, although the technique regarding an emulsifier (surfactant) free emulsion is proposed, the example which applied this to aerosol products is not known.
An object of the present invention is to provide an aerosol product filled with an emulsion prepared without using an emulsifier (surfactant).

The present invention is an emulsion comprising an oil phase containing oil and an aqueous phase, and an aerosol product filled with a propellant,
An aerosol product characterized in that the emulsion does not contain an emulsifier.

  According to the present invention, it is possible to provide an aerosol product filled with an emulsion prepared without using an emulsifier (surfactant).

Diagram showing particle size distribution of emulsion droplets Photograph showing change over time of emulsion

In the present invention, descriptions such as “以上 or more and ● or less” and “○ to ●” or the like indicating numerical ranges are ranges including the lower limit and the upper limit which are endpoints, unless otherwise noted.
The emulsifier or surfactant means an agent which acts on the interface between the oil phase and the water phase to lower the interfacial tension.
The present invention is an emulsion comprising an oil phase containing oil and an aqueous phase, and an aerosol product filled with a propellant,
The emulsion is characterized in that it contains no emulsifier.

It was found that the use of the emulsion as described above results in a smaller droplet size and a wider spray angle as compared to an aerosol product filled with only the aqueous phase. Therefore, the sprayed mist can soften and alleviate the stimulation, and further, can suppress unpleasant noise when spraying.
The reason for the decrease in droplet diameter and the increase in spray angle is considered as follows. The mist is the water fragmented and sprayed into the air. When oil droplets intervene in water as in the case of an emulsion, the number of broken surfaces increases, and mist droplets (droplets) become smaller at the time of spraying.
It has also been found that by applying the emulsion as described above to an aerosol product, the emulsion can be easily redispersed by shaking the product during use.

Hereinafter, materials which can be used in the present invention will be described.
<Oil phase>
The oil phase contains an oil component. Additives such as pigments, perfumes and active ingredients may be used in the oil phase as long as the effects of the present invention are not impaired.
The emulsion is preferably an oil-in-water (O / W) emulsion in which an oil phase is dispersed in an aqueous phase. The content of the oil in the emulsion is preferably 0.1 to 1.0% by mass, more preferably 0.3 to 0.5% by mass. The dispersion stability of a droplet becomes favorable as it is the said range.
The oil component is not particularly limited, and is insoluble in water, such as saturated hydrocarbon, unsaturated hydrocarbon, higher fatty acid, lower fatty acid, alcohol, ester, ether, silicone oil, fluorocarbon and a mixture of two or more of them. A thing (phase-separating with water) can be used widely.
Specifically, the following may be mentioned.
For example, vegetable oils such as soy sauce, argan oil, soybean oil, olive oil, castor oil, coconut oil, soy sauce, palm oil, sesame oil, jojoba oil, cottonseed oil, rapeseed oil, rapeseed oil, linseed oil, rosehip oil and the like.
In addition, squalane, oleic acid, diet, UV absorber, essential oil, etc.
Preferably, it is at least one selected from the group consisting of soy sauce, argan oil, soybean oil, olive oil, castor oil, coconut oil, soy sauce, rosehip oil, squalane, dito, oleic acid and essential oils.
More preferably, vegetable oil such as soy sauce, argan oil, soybean oil, olive oil, castor oil, coconut oil, soy sauce, squalane, etc. are used.
These oils have low solubility in water and can form a strong interface, and thus the dispersion stability is improved over a long period of time, which is preferable.

<Water phase>
The water phase contains water. To the extent that the effect of the present invention is not impaired, flavoring agents and additives such as active ingredients and antioxidants may be used.
As the aqueous phase, it is possible to use one that is miscible with water (not phase separated), such as alcohol, in addition to water.
For example, lower alcohols (for example, aliphatic monohydric alcohols having 1 to 3 carbon atoms such as ethanol); polyhydric alcohols (for example, glycerol, propylene glycol (PG), dipropylene glycol (DPG), 1,3-butanediol, etc. Butanediol, polyethylene glycol (PEG)); pH adjuster (eg citric acid, lactic acid, triethanolamine, KOH, NaOH); rust inhibitor (eg aqueous ammonia, ammonium benzoate, sodium nitrite); preservative (eg eg) Parabens, phenoxyethanol); urea; minerals such as calcium, iron, sodium and the like.

<Propellant>
The aerosol product contains a propellant. The propellant is not particularly limited, and a liquefied gas may be used or a compressed gas may be used. Preferably, it is a compressed gas, such as nitrous oxide gas, nitrogen gas, carbon dioxide gas, or a mixed gas thereof.

<Aerosol Products>
The aerosol container used for aerosol products can utilize a well-known various container as a pressure-resistant container. Moreover, according to the kind of pressure-resistant container, the structure for mounting a valve apparatus can be selected suitably.
Aerosol products are produced by filling the emulsion into an aerosol container, ie a pressure-tight container equipped with a valve for aerosol (injection valve). For example, an aerosol product is produced by preparing an emulsion and filling the resulting emulsion and propellant into an aerosol container. A so-called double container may be adopted in which an inner container is further provided in the pressure resistant container and the propellant and the emulsion are separated by the inner container.
The mixing ratio of the emulsion and the propellant is preferably about 70/30 to 35/65 by mass ratio (emulsion / propellant) for liquefied gas. In the case of compressed gas, the weight ratio (emulsion / propellant) is preferably about 99.9 / 0.1 to 98/2.
The form of discharge of the aerosol product is not particularly limited, but is preferably in the form of spray or mist from the viewpoint of the effect of the present invention.

<Emulsion>
The production method of the emulsion is not particularly limited, and known methods can be used. A method of mixing the aqueous phase and the oil phase and dispersing it with a homogenizer, ultrasonic dispersion machine or the like can be mentioned, for example.
After dropping the oil phase to the water phase, it is preferable to disperse it using a bath type ultrasonic disperser. The conditions of ultrasonic dispersion are preferably 10 to 60 kHz (more preferably 20 to 40 kHz) and irradiation of ultrasonic waves for about 1 to 10 minutes (more preferably 4 to 6 minutes). The temperature condition is preferably about 4 to 60 ° C. (more preferably 20 to 40 ° C.).
By adopting the method as described above, it is believed that the particle size distribution of the oil droplets is narrow and unimodal, so that the dispersion stability of the emulsion is improved over a long period of time.
The droplet diameter of the dispersed droplets in the obtained emulsion is preferably 0.5 to 5.0 μm, more preferably 1.0 to 3.0 μm, as a volume average particle diameter.
The particle size distribution of the droplets can be measured with a laser diffraction / scattered particle size distribution measuring device manufactured by HORIBA.

  Hereinafter, the present invention will be specifically described with reference to examples. However, the present invention is not limited to the aspects of the following examples.

<Production of Emulsion 1>
99.6% by mass of ultrapure water is mixed with 0.4% by mass of Nikko Chemicals "Akinin oil" (manufactured by Nippon Surfactant Industries Co., Ltd.), and a temperature of 25 ° C and a frequency of 28 kHz using a 300 W bath type ultrasonic dispersion machine. Ultrasonic dispersion was performed under the condition of 5 minutes of treatment time to obtain an emulsion 1. The droplet diameter of the obtained emulsion 1 was 2.5 μm in volume average particle diameter. The measurement results of the particle size distribution of the droplets are shown in FIG.
The obtained emulsion 1 was allowed to stand for 40 days. As shown in FIG. 2, the dispersed state remained stable after 40 days.

Example 1 Production of Aerosol Product 1
The emulsion 1 and the filler (nitrogen gas) are charged in a pressure ratio container equipped with a jet valve device at a mass ratio of emulsion 1: filler = 99: 1, and the pressure is adjusted to 0.7 to 0.8 MPa (equilibrated filling ) To obtain an aerosol product 1. The form of injection was spray-like.

Comparative Example 1: Production of Comparative Aerosol Product 1
A comparative aerosol product was obtained in the same manner as in Example 1 except that the emulsion 1 was changed to ultrapure water.

The aerosol products of Example 1 and Comparative Example 1 were compared.
The diameter of the ejected droplets was measured with a laser diffraction particle size distribution analyzer (Spraytec: Malvern). Example 1: Average 64.88 μm, Comparative Example 1: average 69. 42 μm It was possible to eject very fine droplets.
The spray angle was Example 1: 75 degrees, Comparative Example 1: 37 degrees, and the aerosol product 1 had a wide spray angle and soft skin area.
Moreover, as for the aerosol product 1, the spray noise at the time of spraying was reducing evidently.

Claims (4)

An emulsion comprising an oil phase and an aqueous phase containing an oil component, and an aerosol product filled with a propellant,
An aerosol product, characterized in that the emulsion contains no emulsifier.   The aerosol product according to claim 1, wherein the emulsion is an oil-in-water (O / W) emulsion in which the oil phase is dispersed in the water phase.   The aerosol product according to claim 1 or 2, wherein the oil content in the emulsion is 0.1 to 1.0% by mass.   The oil component is at least one selected from the group consisting of soy sauce, argan oil, soybean oil, olive oil, castor oil, coconut oil, soy sauce, rosehip oil, squalane, diet, oleic acid, and essential oil. An aerosol product according to any one of 3).