JP2003339298A - Aerosol agent - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent contents from being leaked from a valve of a whole amount-jetting type aerosol product which is filled with a lower alcohol, an aprotonic solvent and dimethyl ether. <P>SOLUTION: The whole amount-jetting type aerosol agent has a fitting part 81 fittable to the side surface of a protrusion of a metallic mounting cup, a pressed part 82 to be pressed to a stem gasket 2, and valves having parts 83 with elasticity, and mounted on the fitting part 81 and a housing body in the aerosol product filled with the lower alcohol, an aprotic solvent other than a hydrocarbon having ≥90°C boiling point, and the dimethyl ether. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aerosol filled with a lower alcohol, an aprotic solvent having a boiling point of 90.degree. Regarding Preferably, it relates to a total injection type aerosol in which the aprotic solvent is an ester organic compound. Further, the present invention relates to a total injection aerosol which is a pest control agent.

[0002]

BACKGROUND OF THE INVENTION Various aerosol products containing propellants are known. Above all, a full-volume injection type aerosol product in which the entire amount of the content in the container is sprayed at once by pressing a button has been widely used. A full-volume injection type aerosol product is a type of "one-shot space treatment agent" that injects the entire amount of the content by one injection start operation and treats a wide space such as a living room. It is used as a pest control agent and deodorant containing active ingredients such as ticks and insect repellents. The full-volume injection type aerosol requires the momentum of injection and an appropriate amount and particle size distribution of the ejected product in order to cope with a wide space treatment. In order to prevent wetting and contamination by the contents after use, it is advantageous to use a small amount of the stock solution excluding the propellant of the contents, and it is also preferable for atomization.
Therefore, as compared with a general spray aerosol, it is preferable to reduce the amount of the stock solution to increase the concentration of the active ingredient, and as the solvent, a lower alcohol or an aprotic solvent having a high polarity for dissolving various active ingredients is used. Further, dimethyl ether is preferably used as the propellant. further,
The stock solution is filled with a large amount of propellant, or the compressed gas is used together to increase the injection pressure to obtain the injection force and the desired particle size distribution. As a result, the amount of leakage becomes larger than that of a general spray aerosol, and in particular, the leakage of the injection gas with time leads to the deterioration of its performance.

Leakage of contents (primarily propellant) from valves in aerosol products is well known in the industry. Leakage of contents from an aerosol product not only deteriorates the product but also causes a risk of leakage during storage. Preventing this is important not only for maintaining the performance of the product, but also for ensuring the safety in the distribution and storage of the product. Cosmetics, paints, flies
The general spray aerosol products used for mosquito pesticides are used temporarily and locally, so that the full spray type aerosol product requires a long spray distance and high area and space. Uniform diffusivity is not essential and leakage is often not a major issue. However, gas leakage in full-blown aerosol products poses a major problem for product performance.

Leakage in these aerosol products occurs also in the portion where the mounting cup is clinched and fixed to the upper end opening (winding portion) of the aerosol container, but it is considered that it mainly occurs in the valve portion. A valve for aerosol products is an important part that is indispensable for aerosol products, and it is a very simple operation that sprays the contents when needed and keeps the contents firmly inside when not needed. It must be airtight. It is also important to select a valve according to the application such as hair spray, paint spray, and foam spray so that the contents can be sprayed when necessary. If this selection is made incorrectly, not only the injection performance suitable for the intended application cannot be obtained, but also leakage and clogging occur and injection becomes impossible, which is a fatal defect for aerosol products. Therefore, the choice of valve is an important factor in determining the function of the product for aerosol products.

Valves for aerosol products are roughly classified into three types. One is a push-down type valve that opens the valve by pushing down the valve stem, the second is a tilt type valve that opens the valve by tilting the stem, and the third is a thread on the valve. It is a screw type valve. The mainstream of current valves for aerosol products is the push-down type valve that was first introduced, and the contents are ejected by indirectly or directly pushing the stem with a finger or the like.

FIG. 1 shows an example of a cross-sectional view of a push-down type valve in a conventional total injection type aerosol product. In FIG. 1, 1 is a mounting cup, 2
Is a stem gasket, 3 is a stem, 4 is a spring, 5
Is a housing, 6 is a mounting gasket, and 7 is a dip tube. At the periphery of the mounting cup 1, an aerosol is fixed to a container body (not shown) by a mounting gasket 6 and hermetically sealed. The mounting cup 1 is provided with a projecting portion at the center thereof, and the stem 3 is inserted into the housing 5 via the stem gasket 2 in the opening provided in the projecting portion of the mounting cup 1.
The housing 5 made of synthetic resin is crimped by crimping the upper end thereof to the stem gasket 2,
It is held in the mounting cup 1 by being sandwiched by a recess provided in the middle of the protruding portion of the mounting cup 1. A spring 4 is inserted between the lower portion of the stem 3 and the bottom portion of the housing 5.

The stem 3 has a stem hole,
When not in use, the stem hole is crimped to the stem gasket 2 to maintain the airtightness inside the aerosol product. When using the aerosol product, the stem 3 is pushed down toward the bottom of the housing 5, and the stem hole crimped to the stem gasket 2 moves further below the stem gasket 2, so that the stem hole communicates with the inside of the housing 5. Then
The contents of the aerosol product introduced into the housing 5 through the dip tube 7 pass through the stem hole,
Further, it is ejected and ejected to the outside through a hole inside the stem.

The stem gasket 2 is inserted between the mounting cup 1 and the housing 5 and seals the contents so as not to leak. Further, in order to ensure this sealing action, the housing 5 is pushed upward by the concave portion in the middle of the protruding portion of the mounting cup 1 to increase the airtightness by the stem gasket. In many cases, a full-volume injection type aerosol product has a higher internal pressure than a normal aerosol product, and even if airtightness is maintained by the stem gasket 2, the content is
It becomes easy to leak from the portion of the stem gasket 2 through between the housing 5 and the housing 5. Further, as described above, a lower alcohol as a solvent, a highly polar aprotic solvent,
When dimethyl ether is used as the propellant, these cause deterioration of the rubber or resin used for the valve or seal and dissolution of the plasticizer thereof, which easily causes leakage.

In order to prevent such leakage, it is necessary to push up the housing 5 sufficiently to the upper part by the recess in the middle of the protrusion of the mounting cup 1, but the protrusion of the mounting cup 1 is usually When it is attempted to form the above-mentioned recessed portion in this columnar shape, a plurality of recessed portions will come into contact with the curved side surfaces of the projecting portion at points, respectively. The contact area is small and the mounting cup 1 and the housing 5
An air gap will be generated between them. Therefore, the airtightness of the stem gasket 2 is required. In order to prevent such leakage, the material and shape of the stem gasket may be improved (eg
711), improve the shape of the housing (for example,
Japanese Patent Publication No. 56-53425) and methods for improving the shape of the clinch portion (for example, JP-A-8-61598) are known. Regarding the material of the stem gasket, dimethyl ether as a propellant may accelerate the deterioration of the stem gasket. Generally, when using dimethyl ether, the material of the stem gasket is isobutylene / isoprene rubber (IIR). It has been known.

[0010]

When the contents of aerosol products, especially propellants, are leaked, the composition of the contents is changed and their basic performance is affected. In particular, full-volume spray aerosol products require a particular momentum of spraying and proper particle size distribution of the sprayed product in order to handle a large space at a time. It is filled by filling a large amount of propellant or by using a compressed gas together to increase the injection pressure. Further, in the case of a total amount injection type aerosol, it is desirable to increase the concentration of the active ingredient from the viewpoints of injection force, particle size distribution, indoor pollution, etc., and polarities that easily affect rubber or resin as a solvent Often high aprotic solvents are used. As a result, compared to general spray aerosols, full-volume injection type aerosol products cause a large amount of leakage of contents, and in particular, leakage of injected gas with time not only leads to deterioration of its performance, but this also results in deterioration of its performance during use and product. The safety against leakage accidents during distribution was reduced.

The present invention relates to an aerosol product, in particular, a lower alcohol which dissolves various active ingredients, an aprotic solvent having a high polarity except hydrocarbons, and a content of a content of a valve of a total injection type aerosol product filled with dimethyl ether. The purpose is to prevent leakage. More specifically, the present invention has a boiling point of 9 excluding ethanol and hydrocarbons.
Aerosol products filled with aprotic solvents at 0 ° C or higher and contents with strong polarity such as dimethyl ether have little leakage of contents and can be securely fixed to the mounting cup by a simple means. An object of the present invention is to provide a valve having a housing and an aerosol product using the valve.

[0012]

Means for Solving the Problems The present inventors have found that a lower alcohol capable of dissolving various active ingredients, an aprotic solvent having a high polarity excluding hydrocarbons, and an aerosol filled with dimethyl ether are used as contents. As a result of researching the reduction of leakage over time, the mounting cup and housing are made of metal, and the elastic force of the housing itself fits the protruding side of the mounting cup to separate the housing and protruding side of the mounting cup. It has been found that the object can be achieved by adhering without forming a concave portion. That is,
The present invention, in an aerosol filled with a lower alcohol, a highly polar aprotic solvent, and dimethyl ether, can be crimped to a fitting portion capable of fitting with a protruding side surface of a metal mounting cup in a metal housing, a stem gasket. The present invention relates to a full-volume injection type aerosol characterized in that it has a crimping portion and a portion where the fitting portion and the housing body have an elastic force.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION One embodiment of the present invention will be illustrated and described with reference to a sectional view of a valve used in the present invention. FIG. 2 is a sectional view of the valve used in the present invention. In FIG. 2, 1 is a mounting cup, 2 is a stem gasket, 3 is a stem, 4 is a spring, 8 is a housing used in the present invention, 6 is a mounting gasket, and 7 is a dip tube. The basic structure of the valve shown in FIG. 2 is the same as that of the push-down valve type valve shown in FIG. 1, but the housing part is different, and it is necessary to form a concave portion on the side surface of the protruding portion of the mounting cup 1 in FIG. Not.

FIG. 3 (a) is a cross-sectional view of the housing portion shown in FIG. 2, and FIGS. 3 (b)-(e) show other embodiments, but are not limited to these. In FIG. 3, reference numeral 81 is a fitting portion, 82 is a crimping portion, 83 is a portion having elastic force between the fitting portion and the main body, 84 is an opening at the bottom of the housing, and 85 is a housing main body. In the example of the housing shown in FIG. 3 (a), the housing is made of metal and is formed in an inverted U shape so that the crimping portion 82 forms the fitting portion 81. An elastic force based on the material is generated. An opening 84 is provided at the bottom of the main body 85, and the contents inside the housing are introduced through the opening 84. The fitting portion 81 has an elastic force, and the housing of the present invention is
By press-fitting into the protruding portion of the mounting cup 1 in FIG. 2, the housing 8 and the inside of the side surface of the protruding portion of the mounting cup 1 can be fitted together.

The material of the housing may be any metal that can generate an elastic force between the fitting portion and the main body, and examples thereof include aluminum, stainless steel, tin plate, brass, and the like. It is preferable to use the same material as the mounting cup in terms of fitting property, adhesiveness, and the like. The surface of the housing may be subjected to surface treatment such as plating or polymer treatment, if necessary. When elastic force is not generated between the fitting portion and the main body by molding, for example, an instrument (for example, a spring) or a material (for example, rubber, synthetic material) having an elastic force between the main body 85 and the fitting portion 81. It is also possible to put a resin or the like) so that the portion 83 between the main body and the fitting portion has an elastic force.

As the crimping portion 82, the stem gasket 2
Although any shape may be used as long as it can be crimped to, it is preferable to use the shape that produces the elastic force as it is as shown in FIG. When the crimping force is insufficient, it is possible to make the shape more acute or to provide a convex annular material at the portion to be crimped with the stem gasket, and further to install a device or material on the surface of the crimping portion 82 to improve the crimping force. It can be provided, or the surface can be processed to improve the crimping force. The shape of the main body 85 is not particularly limited, and can be appropriately selected so that the type and contents of the valve and the desired injection state can be obtained.

The housing 8 shown in FIG. 3 has a fitting portion 81.
Is an example of fitting and closely adhering to the inside of the side surface of the protruding portion of the mounting cup 1 over the entire circumference. However, depending on the contents of the aerosol product and other needs, a part of the mounting cup 1 may be attached. It is also possible not to make close contact with the inside of the side surface of the projecting portion. For example, when filling the contents from the valve portion, if there is too much adhesion and it takes a long time to fill, a portion such as a gap may be provided in a part of the fitting portion. Further, after the housing 8 is press-inserted into the mounting cup 1, a gap may be further created by crimping. However, if there is no special circumstance, it is preferable that the fitting portion 81 fits and closely contacts the inside of the side surface of the protruding portion of the mounting cup 1 over the entire circumference as shown in FIG.

As the stem, various types can be used according to the shape of the housing, and as the material thereof, various types such as synthetic resin and metal can be used. The stem gasket and the mounting gasket may be any as long as they can maintain airtightness, but IIR is preferable for the contents of the present invention. In addition, a sealing material for preventing gas permeation may be attached to the lower surface or upper and lower surfaces of the gasket material.

The lower alcohol used in the present invention is an alcohol having 3 or less carbon atoms, and ethanol is preferable from the viewpoints of toxicity and odor. The content of the lower alcohol in the content can be appropriately set, but the content in the undiluted solution (contents excluding the propellant) is preferably 0.05 or more in volume ratio.

The aprotic solvent used in the present invention preferably has a high boiling point from the viewpoint of fire prevention and handling, and the boiling point is preferably 90 ° C. or higher. Examples of the aprotic solvent include, but are not limited to, the following, and two or more kinds may be used. Ester: diisopropyl adipate, triethyl acetylcitrate, ethyl acetoacetate, benzyl benzoate, butyl acetate, diethyl sebacate, dimethyl carbonate, diethyl carbonate, propylene carbonate, methyl lactate, ethyl lactate, butyl lactate, γ-butyrolactone, propionic acid Benzyl,
Ethers such as ethyl butyrate: Ethyl isoamyl ether, ethyl benzyl ether, dioxane, dibutyl ether, alkylene glycol dialkyl ethers such as ethylene glycol dialkyl ether, diethylene glycol dialkyl ether, glycerin triacetate, ketones: acetylacetone, isophorone, diisobutyl ketone, cyclohexanone , Dipropyl ketone, methyl isobutyl ketone, and other nitrogen-containing compounds: 1,
3-Dimethyl-2-imidazolidinone, N, N-dimethylformamide, N-methylpyrrolidone, N-ethylpyrrolidone and the like, and others: dimethyl sulfoxide and the like. The blending amount of the aprotic solvent in the contents can be appropriately set, but the blending amount in the stock solution (contents excluding the propellant) is preferably 0.05 or more in volume ratio.

As the propellant, a compressed gas such as liquefied petroleum gas, nitrogen gas, carbon dioxide gas or compressed air can be used in addition to dimethyl ether. The amount of propellant and solvent can be set appropriately, but the propellant volume ratio to the undiluted solution is 1 or more, and the pressure as an aerosol agent is 3 at 3O 0 C.
It is preferably at least kg / cm ^{2, and the} volume ratio of dimethyl ether in the propellant is preferably at least 0.1.

The present invention can be used for various kinds of aerosol products, but it is preferable to use it for all-volume injection type aerosols which have a great influence of performance deterioration due to leakage. When using the aerosol of the present invention, various nozzles can be attached to the tip of the stem depending on the application of the aerosol agent. The nozzle may have one opening or two openings or more depending on the application of the aerosol agent. When there are two or more injection holes, the angle of the injection holes can be set arbitrarily according to the application.

The contents of the aerosol of the present invention include insecticides, acaricides, insect repellents, pest control agents such as repellents, fragrances, deodorants, germicides / disinfectants, cosmetics, detergents, etc. Various things can be used, and they can also be used in combination, but in the case of a total amount injection type aerosol, a pest control agent, an aromatic agent, which sprays the entire amount at one time,
Deodorants are preferred. As pest control agents, permethrin, phenothrin, cyphenothrin, empentrin,
Pyrethroids such as Praresulin, Resmethrin, Transfluthrin, Pyrethrin, Carbamate compounds such as Methoxadiazone, Organophosphorus compounds such as Fenitrothion, Diet, MGK-11, MGK
-326, pyrethrum extract, plant essential oil, or a combination thereof can be used. In addition to these active ingredients, various additives such as efficacy enhancers, antioxidants, deodorants, fragrances, colorants, and surfactants may be added as necessary.
Further, as a solvent or an extender, alcohols other than lower alcohols, glycol ethers, esters such as isopropyl myristate, petroleum-based solvents such as kerosene, naphthene and paraffin, and water can be added.

A pest control agent is added as an active ingredient to the total amount injection type aerosol agent of the present invention, and if necessary, a solvent and various additives are added thereto, and a propellant containing an appropriate amount of dimethyl ether and an optional amount are added. By enclosing a compressed gas, a pest control agent can be made into a total amount injection type aerosol agent. The full-quantity-injection-type aerosol agent of the present invention can reduce the leakage of the contents, and therefore the quality is less deteriorated. The total amount injection type aerosol agent of the present invention is sprayed over a wide range at one time within a few minutes, for example, within about 3 minutes depending on the amount of the content, and survives within the injection range and the reaching range of the injection particles. It can control pests such as flies, mosquitoes, chisels, mites and cockroaches. That is, by using the total amount injection type aerosol agent for controlling pests of the present invention,
The pests in the room can be easily controlled in a short time.

[0025]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.

Example 1 As an insecticidal active ingredient, 1.25 g of methoxadiazone and 0.5 g of phenothrin were dissolved in the solvent ethanol and propylene carbonate (1: 1) and mixed to prepare an aerosol stock solution 11.5.
It was set to g. A propellant, dimethyl ether, was added to 11.5 g of this stock solution and filled into an aerosol container equipped with a valve so that the content was 46.5 g to produce a full-volume spray type aerosol agent for 6 to 10 tatami mats. The filling container, the mounting cup, the housing were made of tin, and the stem was made of metal. I for stem gasket and mounting gasket
IR was used. As a comparative example, an aerosol agent was manufactured in the same manner by using different materials for the housing and the stem. Table 1 shows the results of carrying out the leakage test by storing the aerosol at 25 ° C. The slit in the table means that the housing has a slit for high-speed filling in the crimp portion above the housing.

[0027]

[Table 1]

As is clear from these results, ethanol, propylene carbonate and dimethyl ether have good solubility in many active ingredients, but have a strong effect on the rubber and resin used for the aerosol component. In the thing,
According to the present invention, the leakage amount of the content can be reduced to about 2/3 as compared with the conventional resin valve without slit (Comparative Example 1), and a general-purpose resin valve with slit capable of high-speed filling. It can be reduced to about 1/2 as compared with (Comparative Example 3). In addition, the injection test (about 25
As a result, it was confirmed that it has sufficient performance as a full-volume injection type aerosol agent as follows. Injection momentum (length): The average injection length was 1.5 m or more, which was suitable for treating a large indoor space. Injection time: As a result of the measurement, a time of 66 seconds to 1 minute and a half was obtained. Particle size distribution: As a result of measuring the average particle size, it was 20 μm or less, which was good.

Example 2 As an insecticidal active ingredient, 0.75 g of methoxadiazone and 1 g of permethrin were dissolved in the solvent ethanol and propylene carbonate (1: 1) and mixed to prepare an aerosol stock solution 11.5.
It was set to g. Others produced the full-quantity injection type aerosol agent for 6-10 tatami mats like the Example. As a comparative example, an aerosol agent was manufactured in the same manner by using different materials for the housing and the stem. Table 2 shows the results of the leakage test conducted by storing the aerosol at 25 ° C.

[0030]

[Table 2]

As is clear from this result, according to the present invention, even if the active ingredients are different, the leakage amount of the contents can be suppressed by the present invention, and the slitless resin valve (Comparative Example 4). ) Can be reduced to about half.

Example 3 As an insecticidal active ingredient, 1 g of methoxadiazone, 0.5 g of phenothrin, and 0.13 g of d.d-T-cyphenothrin were dissolved in ethanol and propylene carbonate (1: 1) as a solvent and mixed to prepare an aerosol stock solution. It was 11.5 g. The other is
In the same manner as in Example 1, a total injection aerosol for 6 to 10 tatami mats was produced. As a comparative example, an aerosol agent was manufactured in the same manner by using different materials for the housing and the stem. Table 3 shows the results of the leakage test conducted by storing the aerosol at 25 ° C.

[0033]

[Table 3]

As is clear from this result, Example 1
As in the cases of and 2, the present invention can suppress the amount of leakage of the contents, and can greatly reduce the amount of leakage compared with the resin valve without slit (Comparative Example 5).

[0035]

INDUSTRIAL APPLICABILITY According to the present invention, even in the case of aprotic solvent having a boiling point of 90 ° C. or higher which is not a hydrocarbon, a solvent which has a high solubility of an active ingredient such as dimethyl ether, or a content which has a strong influence on a resin such as a stem gasket, an aerosol can be obtained. Leakage of the product contents can be significantly suppressed, and the aerosol product can be stored for a long period of time without deterioration of quality. Further, the valve member to be used is easy to manufacture, and it is easy to assemble the valve member and the aerosol device.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a conventional push-down type valve.

FIG. 2 is a sectional view of a valve used in the present invention.

FIG. 3 is an example of a sectional view of a housing used in the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Mounting cup 2 Stem gasket 3 Stem 4 Spring 5 Housing 6 Mounting gasket 7 Dip tube 8 Housing 81 used in the present invention 81 Fitting portion of the housing used in the present invention 82 Crimping portion of the housing used in the present invention 83 In the present invention The elastic part of the housing used 84 The bottom opening 85 of the housing used in the invention 85 The body of the housing used in the invention

Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B65D 83/36 A01N 43/82 101E 83/40 53/00 508A // B05B 9/04 (72) Inventor Masatsugu Matsuura 102-5, Nakata-Shinden, Furukawa, Ibaraki Prefecture (72) Inventor Masaaki Seki 2-7, Kanda Sakumacho, Chiyoda-ku, Tokyo Within Mitani Valve Co., Ltd. (72) Keiro Ishihara 3-41-8 Takada, Toshima-ku, Tokyo Chugai Pharmaceutical Co., Ltd. (72) Inventor Atsushi Tate, 2-1-9 Kyobashi, Chuo-ku, Tokyo Chugai Pharmaceutical Co., Ltd. (72) Inventor Tatsuya Kamezawa 3-41-8 Takada, Toshima-ku, Tokyo Chugai Pharmaceutical Co., Ltd. In-company F-term (reference) 2B121 AA11 AA16 CB07 CB22 CB28 CB47 CB65 CB69 CC02 CC25 CC31 FA03 FA07 3E014 PA01 PB01 PB10 PC02 PD02 PE15 PF06 4F033 RA02 RC04 4H011 AC02 AC04 BA06 BB10 BB15 BC03 BC06 BC12 DA12 DA16

Claims (3)

[Claims] 1. A full-quantity-injection-type aerosol agent, which is filled with a lower alcohol, an aprotic solvent having a boiling point of 90 ° C. or higher that is not a hydrocarbon, and dimethyl ether, and a mounting cup and a housing made of metal. 2. The total amount injection type aerosol composition according to claim 1, wherein the aprotic solvent is an ester organic compound. 3. The total injection aerosol composition according to claim 1, which is a pest control agent.