JPH0347906B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to powder spray aerosol products. More specifically, the powder is highly concentrated,
Moreover, it concerns a powder spray aerosol product that suppresses scattering.

BACKGROUND OF THE INVENTION Powder spray aerosol products, such as antiperspirant aerosols, have been used in the past.

In most conventional powder spray aerosol products, powder is dispersed in liquefied gas as a propellant and filled into an aerosol container.

[Problems to be Solved by the Invention] The proportion of powder in such powder spray aerosol products is only 2 to 10% (weight %, the same shall apply hereinafter) of the total amount; It has the disadvantage that there is a lot of scattering when doing so.

The reason why the proportion of powder can only be 2 to 10% of the total amount is that it is difficult to disperse in the aerosol container, and the powder tends to bunch up over time and clog in parts such as valves and buttons. This is because if the concentration is too high, it will gel and adhere to the inner wall of the container, making it difficult for the powder to be sprayed out of the container.

In order to solve these problems, the amount of liquefied gas used as a propellant increases, resulting in finer mist, poor adhesion, and increased scattering. This results in the unnecessary release of chemicals into the air.
Not only is there a lot of waste, but the drug can also be inhaled,
If the drug adheres to mucous membranes, it is harmful and poses a safety problem.

The present invention was made in order to solve the above-mentioned problems, and aims to provide an aerosol product that has a high blending ratio of powder in a can and suppresses unnecessary scattering. be.

[Means for Solving the Problems] The present invention provides a first aerosol container that is divided into a first chamber and a second chamber, the interior of which is communicated with the outside through a nozzle by a movable partition wall. The first chamber is filled with a mixture of powder and liquid with a boiling point of -10 to 60°C, and the second chamber is filled with a propellant, and the pressure of the propellant causes the above-mentioned This invention relates to a powder spray aerosol product characterized in that a mixture of powder and a liquid having a boiling point of -10 to 60°C is pressurized and sprayed from an injection port.

[Example] The interior of the aerosol container used in the present invention is divided by a movable partition wall into a first chamber and a second chamber that communicate with the outside through an injection port. Specific examples of such aerosol products will be explained based on the drawings.

The aerosol container shown in FIG. 1 (cross-sectional view) has almost the same structure as a conventionally used double aerosol container, except for a part of the structure.

That is, 1 is a button, the button 1 is provided with a nozzle 1a, the nozzle 1a is provided with a hole 2, and the tip of the nozzle 1a opens as an injection port 2a. The button 1 is fitted onto the upper end of a stem 3, and the stem 3 is fitted into a valve 4. Valve 4 is mounting cap 5
It is attached to the upper end opening of the pressure-resistant container 6 by a. A flexible inner bag 7 forming a partition wall is housed inside the pressure container 6, and the upper end of the inner bag 7 is caulked together with the mounting cap 5 to the upper end of the pressure container 6. Thereby, the pressure container 6 is divided into a first chamber 8 and a second chamber 9 by the inner bag 7.

The first chamber 8 contains powder and boiling point which will be described later.
Liquid mixture at 10-60℃ (hereinafter referred to as propellant)
is filled, and the second chamber 9 is filled with propellant. Note that a valve 10 for filling a propellant is provided at the bottom of the pressure container 6.

In the case where the injection port 2a of the button in the present invention has a circular cross-sectional area, the inner diameter is 0.3 to 10.0 mm.
(cross-sectional area: 0.07 to 78.5 mm ² ). If the inner diameter is smaller than 0.3 mm (cross-sectional area 0.07 mm ² ), the amount of injection of a mixture of powder and liquid with a boiling point of -10 to 60°C will be reduced, and the size of the powder will be limited. 10.0mm (cross-sectional area
If it is larger than 78.5 mm ² ), the injection amount will be large but the injection speed will be low and the injection distance will be short, which is not preferable. Note that the cross-sectional shape of the injection port 2a is not limited to a circular shape, and may be any shape such as a rectangle or a rhombus.

As the aerosol container used in the present invention, the first
In addition to the movable partition wall formed by the inner bag 7 shown in the figure, the partition wall may be formed by a piston 11 as shown in FIG. 2, for example.

The aerosol container shown in FIG. 2 (partially cutaway side view) employs a piston 11 that slides along the inner surface of the pressure container 6 in place of the inner bag 7 in FIG. 1, and has an injection port 2a. The product is almost the same as the aerosol product shown in Fig. 1, except that the nozzle 1a is directed diagonally upward so that the nozzle 1a is directed diagonally upward.
Corresponding parts are given the same reference numerals and their explanations will be omitted.

There is no particular limitation on the ratio of the volumes of the first chamber and the second chamber, but it is important that as much as possible of the propellant be put into the first chamber and that the propellant be put into the second chamber. It is preferable to inject at a desired pressure so that as little as possible remains. From this point of view, when the volume of the first room is maximum, it is preferable that the ratio of the volume of the first room to the volume of the second room is about 20/1 to 6/4.

In addition, in order to ensure that the propellant filled in the first chamber is injected at the desired pressure and to minimize the remaining amount of the propellant, a partition wall is provided between the first chamber and the second chamber. It is preferable that the volume of the first chamber decreases as the propellant decreases, and the pressure caused by the propellant filled in the second chamber is directly transmitted to the filler filled in the first chamber.
From this point of view, for example, the partition walls of an aerosol container as shown in Figure 1 are made of materials such as polyethylene, polyamide, polyvinylidene chloride, polyethylene terephthalate, ethylene-vinyl alcohol copolymer, and other synthetic resins. It is preferable to use a flexible film having a thickness of about 0.1 to 1.0 μm, no pinholes, low gas permeability, and high solvent resistance. The film may be a single layer or a laminated film. Further, as the partition wall of the aerosol container shown in FIG. 2, it is preferable to use a piston made of synthetic resin such as polyethylene, polypropyline, polyamide, polyacetal, or the like. The piston may be formed from a single layer of material, or may be formed from a laminated material;
When using a laminated material, it is preferable to use a material in which at least one layer of materials with low gas permeability is laminated.

In the present invention, as already described, the first chamber is filled with a mixture of powder and a liquid with a boiling point of -10 to 60 DEG C., and the second chamber is filled with a propellant. In addition, if the powder aerosol product is a pharmaceutical, it must contain the active ingredients necessary as a medicine, if it is a quasi-drug, it must contain the active ingredients necessary as a quasi-drug, and if it is a cosmetic, it must contain the active ingredients necessary as a cosmetic. In the case of pesticides, the necessary amount of active ingredients as pesticides are mixed in the first chamber.

There are no particular restrictions on the type of powder, such as calcium carbonate, bicarbonate of soda, carbonate of soda,
Mineral products such as calcium chloride, common salt, other metal salts, talc, kaolin, activated clay, diatomaceous earth, inorganic substances such as ammonium phosphate, anhydrous silica, zeolite, aluminum chlorohydrate, organic substances such as organic pigments, or their Examples include mixtures, etc., which may be those whose surfaces have been modified, those which have been microencapsulated, and those whose powders have been impregnated with active ingredients. Good too.

The powder used in the present invention is preferably filled in the first chamber by approximately 70 to 95% by volume when mixed with a liquid at -10 to 60°C, for example, the first chamber has a maximum internal volume of 500 ml. In that case, it is preferable to fill approximately 350 to 475 ml.

The boiling point of the first chamber filled with powder is −
The liquid at 10 to 60°C, preferably 0 to 50°C is the first
It mixes with the powder in the chamber, and has the effect of preventing the powder from settling and condensing even if the aerosol product of the present invention is left alone. Pressure in the chamber of 25
The powder is increased to about 0 to 1.5 kg/cm ² G at ℃, and has the effect of assisting the injection by the propellant in the second chamber, keeping the powder in a tight state during injection,
Prevents the powder from becoming fine powder and scattering, improving adhesion to the target object, and quickly volatilizing after injection, leaving only the powder remaining and interfering with the action of the powder. It's something you don't do.

If the boiling point of the liquid is less than -10°C, the pressure at 25°C will be high, causing a lot of splattering and poor adhesion, which is undesirable, and if it exceeds 60°C, drying will be slow when sprayed, which is undesirable.

Specific examples of such liquids include trichloromonofluoromethane, dibromotetrafluoroethane, trichlorotrifluoroethane,
dichlorotetrafluoroethane, (n-)butane,
Pentane, hexane, methylene chloride, acetone, etc. may be used alone, or 2
More than one species may be used in combination. Especially trichloromonofluoromethane, dibromotetrafluoroethane,
It is preferable to use trichlorotrifluoroethane or dichlorotetrafluoroethane primarily, that is, to use it in an amount of 80% or more in the liquid, since it is nonflammable, almost odorless, has no unpleasant sensation, and has low toxicity. Dibromotetrafluoroethane is particularly preferred when used together with a fire extinguishing agent such as sodium bicarbonate because of its excellent fire extinguishing effect.

The powder filled in the first chamber and its boiling point are -10
The proportion of the liquid at ~60°C is preferably 2/1 to 1/5, preferably 3/2 to 2/5 by weight.

For example, if the amount of powder exceeds the above range, it will lose its fluidity and will tend to become injectable, and if the amount of liquid with a boiling point of -10 to 60°C increases, the amount of powder contained in the total amount will be small, and it will not be possible to inject. There is a tendency for the powder to settle in the material, both of which are undesirable.

The propellant filled in the second chamber may be a liquefied gas having a pressure of about 4.0 to 8.0 kg/cm ² G at 35°C. The liquefied gas is preferably a nonflammable gas from the viewpoint of safety, but a flammable liquefied gas may also be used. Examples of the liquefied gas include nonflammable liquefied gases such as dichlorodifluoromethane, bromotrifluoromethane, chlorosylfluoromethane, trichloromonofluoromethane, or dichlorotetrafluoroethane; combustible liquefied gases such as liquefied petroleum gas or dimethyl ether; Although it is preferable to use them alone from the viewpoint of maintaining pressure during use, they may be used in combination. Flammable liquefied gas or flammable mixed liquefied gas for non-flammable liquefied gases such as those mentioned above, which account for 90% or more
Mixtures containing less than 10% of flammable components are also non-flammable, but mixtures containing more than 10% of flammable components often become flammable. The use of non-flammable liquefied gas is preferred but not required.

Next, the method for manufacturing the aerosol product of the present invention will be explained.

filling the first chamber of the aerosol container with powder;
Add a liquid with a boiling point of -10 to 60°C and attach a valve. After that, the second chamber is filled with an appropriate amount of propellant, and an injection device (button) is attached to the valve. However, the liquid at -10 to 60°C may be filled with powder and then attached with a valve, or the powder and liquid may be mixed in advance and then filled. In addition, when using a liquid with a low boiling point as a liquid with a boiling point of -10 to 60℃, after filling the powder, attach a valve, fill with propellant, and then pressurize and fill with a liquid with a boiling point lower than that of the valve. It's okay.

The aerosol product of the present invention thus obtained allows a large amount of highly concentrated powder to be stored in a container.
Not only is it easy to spray, but it also prevents splatter.
It has the characteristics of increasing adhesion and preventing inhalation into the respiratory tract, and can be suitably used as cosmetics for the human body, pharmaceuticals, pesticides for removal, line markers, simple fire extinguishers, etc.

Next, the aerosol product of the present invention will be explained based on Examples.

Example 1 (Baby powder) 100 g of talc and 100 g of trichloromonofluoromethane were placed in the first chamber of a 150 ml aluminum aerosol container with a maximum capacity of 120 ml as shown in Figure 1, and a valve was attached. After that, put 10g of dichlorodifluoromethane in the second room.
and 10 g of dichlorotetrafluoroethane, and a button was attached to obtain baby powder.

[Effects of the Invention] The aerosol product of the present invention has a high blending ratio of powder in the can, and when the powder is sprayed, it not only has good adhesion but also has the characteristics of less scattering and no harm caused by inhalation. However, when using this aerosol product, for example, in the case of a baby powder powder spray aerosol product, effects such as a suitable cooling sensation and smooth skin texture can be obtained.

[Brief explanation of drawings]

FIG. 1 and FIG. 2 are explanatory diagrams each showing an embodiment of an aerosol container used for the aerosol product of the present invention. (Main symbols in the drawing), 2a: injection port, 7: inner bag,
8: First room, 9: Second room, 11: Piston.

Claims (1)

[Claims] 1. The aerosol container is divided into a first chamber and a second chamber, the interior of which is communicated with the outside through an injection port by a movable partition wall, and the first chamber contains powder and the like. A mixture of liquids with a boiling point of -10 to 60°C is filled, and a second chamber is filled with a propellant, and the pressure of the propellant causes the powder and boiling point to rise to -10°C through the partition wall. A powder spray aerosol product characterized in that a liquid mixture at ~60°C is pressurized and sprayed from a nozzle. 2 The ratio of powder filled in the first chamber to liquid with a boiling point of -10 to 60°C is 2:1 to 1:
5. The powder spray aerosol product according to claim 1. 3. Claim 1, wherein the liquid with a boiling point of -10 to 60°C is mainly trichloromonofluoromethane.
Powder spray aerosol products listed in Section 1. 4. Claim 1, wherein the liquid with a boiling point of -10 to 60°C is mainly trichlorotrifluoroethane.
Powder spray aerosol products listed in Section 1. 5. Claim 1, wherein the liquid with a boiling point of -10 to 60°C is mainly dichlorotetrafluoroethane.
Powder spray aerosol products listed in Section 1. 6 Claim 1 in which the liquid with a boiling point of -10 to 60°C is mainly dibromotetrafluoroethane
Powder spray aerosol products listed in Section 1.