Metered dose aerosol products

Abstract

The metering chamber in the metering valve for an aerosol product is made larger so that the entire contents of the metering chamber can be sprayed to the outside with one spray operation.The aerosol product comprises an aerosol container containing contents consisting of an aerosol concentrate and a propellant, a metering valve (10) attached to one end of the aerosol container and having a metering chamber (15) therein, and a spray mechanism connected to the valve stem (12) of the metering valve (10), wherein the metering chamber (15) is formed from at least two small chambers, each of which is connected to the other through a communication passage (15t), and the aerosol concentrate contains powder.

Description

[Technical Field]

[0001] The present invention relates to a metered dose aerosol product in which an aerosol concentrate and a propellant are contained inside an aerosol container equipped with a metered dose valve having a metered dose chamber inside. [Background technology]

[0002] Conventionally, there have been a wide variety of aerosol products equipped with metered dose spray valves, examples of which include those described in the following patent documents.

[0003] The "metered dose injection valve device and aerosol sprayer equipped with the same" described in Patent Document 1 aims to make it possible to change the size of the metered dose chamber at low cost.

[0004] Its configuration involves a metal valve device body attached to a metered injection valve device, with a cylindrical stem housing portion formed in the device body that protrudes downward from the center, and the lower end of the stem housed within the stem housing portion. A central hole is then formed in the bottom of the stem housing portion, and its lower portion is press-fitted into a metered tank. This attaches the metered tank to the valve device body, defining a metered chamber. This allows the contents of this metered chamber to be sprayed through the stem with each injection operation. If it is desired to change the amount of injection per injection operation, the metered tank can be replaced with one of a different shape to change the size of the metered chamber.

[0005] The "metered dose injection valve mechanism and aerosol product equipped with this metered dose injection valve mechanism" described in Patent Document 2 aims to ensure flexibility in the volume of the metered dose chamber of the metered dose injection valve mechanism while utilizing the components of existing valve mechanisms as they are.

[0006] Its configuration consists of an additional unit consisting of an upper cover body and a lower cover body attached to the outside of the housing. When the stem is pressed downward, the sealing surface of the stem extension member connected to the lower end of the stem closes the content flow inlet, forming a metered chamber inside the additional unit and the housing. When the stem is further pressed, the hole (communicating horizontal hole / orifice) moves downward from the stem rubber, connecting the internal passage area of ​​the stem to the metered chamber and discharging the contents of the metered chamber. When the stem is released from pressure, this communication state is released and the content flow inlet is opened, allowing the contents of the container body to flow from the content flow inlet into the metered chamber space area.

[0007] Conventional metered-dose aerosol products have a spray volume of approximately 0.1 to 0.4 mL, which is insufficient for the user to feel comfortable using the product and can lead to excessive spraying. Therefore, there is a need for a metered-dose aerosol product that provides a sufficient spray volume for a comfortable feeling when used and can prevent excessive spraying. Alternatively, some aerosol products require a specific spray volume, such as 1.0 mL or more, depending on the type of content.

[0008] To solve this problem, the present applicant has previously proposed an aerosol metered dose valve with an increased internal volume of the metered dose chamber (Patent Document 3).

[0009] The invention described in Patent Document 3 is an aerosol valve provided approximately in the center of the upper mounting cup of an aerosol container, and comprises a housing, a valve stem that fits into the housing from the upper end, a tube provided at the lower end of the housing for sucking up the contents of the container, a metered chamber provided within the housing, and a biasing member that constantly biases the valve stem upward.When the contents stored in the metered chamber are not in use, the valve stem is pressed down, closing the flow path of the contents and spraying a fixed amount of the contents.In this aerosol metered valve, the metered chamber is located below the biasing member and is formed in a substantially cylindrical shape with an outer diameter larger than the outer diameter of the housing, and the metered chamber comprises an inner metered chamber on the inside and an outer metered chamber on the outside, and these inner and outer metered chambers are separated by an annular partition wall that hangs down from the top of the metered chamber, and the inner and outer metered chambers are connected at the lower end of the annular partition wall. As described above, by forming the metered chamber into two chambers, an inner metered chamber and an outer metered chamber, it is possible to increase the overall internal volume. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Japanese Patent Publication No. 2002-264978 [Patent Document 2] Japanese Patent Application Publication No. 2008-207873 [Patent Document 3] Japanese Patent Application Publication No. 2018-034805 Summary of the Invention [Problem to be solved by the invention]

[0011] In the invention described in Patent Document 3, in an aerosol metered dose spray valve, a passage through which the contents in the aerosol container flow into and out of the metered dose chamber is formed at the upper end (valve stem side) of the inner metered dose chamber. As described above, by configuring the metered chamber into two chambers, an inner chamber and an outer chamber, the passage for the inflow and outflow of the contents into the metered chamber is provided at the upper end of the inner metered chamber.

[0012] In the invention described in Patent Document 3, the internal volume of the metering chamber can be made extremely large by the above-mentioned configuration, but one phenomenon has arisen as a problem in this prior invention. That is, although a fixed amount of a large quantity of contents can be sprayed with a single spray action by pressing the spray mechanism (for example, a push button) connected to the valve stem, there are cases where the spray temporarily stops or is interrupted during that spraying state (hereinafter, this temporary suspension of spraying will also be referred to as "poor spraying"). That is, when the push button is pressed all the way down, normally all of the contents in the metering chamber will be sprayed or sprayed to the outside, but there have been cases where this spraying state temporarily stops or is interrupted.

[0013] In such cases, spraying will resume if the user shakes or shakes the entire aerosol product, but there is a possibility that the user may mistake the interrupted or stopped state for the entire amount having been sprayed, in which case the intended amount will not have been sprayed. Therefore, in a product designed to inject a fixed, predetermined amount, the above-described ejection failure becomes a problem.

[0014] Therefore, an object of the present invention is to increase the internal volume of the metering chamber of an aerosol metering valve to spray a single amount of 0.8 mL or more, while reducing the occurrence of poor spraying. Another object of the present invention is to enable all of the contents in the metering chamber to be efficiently discharged from the discharge port of the valve stem. [Means for solving the problem]

[0015] As a result of extensive research to solve the above problems, the inventors discovered that mixing powder into the contents of an aerosol product reduces the occurrence of poor spraying, leading to the present invention.

[0016] That is, the first aspect of the present invention is an aerosol product comprising an aerosol container containing contents consisting of an aerosol concentrate and a propellant, a metered dose valve provided at one end of the aerosol container and having a metered dose chamber inside, and a spray mechanism connected to the valve stem of the metered dose valve, wherein the metered dose chamber is formed from at least two small chambers which are connected to each other via a communicating passage, and the aerosol concentrate contains powder.

[0017] A second aspect of the present invention is a metered dose aerosol product according to the first aspect of the present invention, wherein the internal volume of the metered dose chamber is 0.8 mL or more.

[0018] A third aspect of the present invention is a metered dose aerosol product according to the first or second aspect of the present invention, wherein the powder is at least one powder selected from the group consisting of anhydrous silicic acid and cyclodextrin.

[0019] The fourth aspect of the present invention is a metered dose aerosol product according to any one of the first to third inventions, wherein the content of the powder in the aerosol concentrate is 0.5 w / v% (mass / volume%) or less.

[0020] The fifth aspect of the present invention is a metered dose aerosol product according to any one of the first to fourth inventions, wherein at least two chambers of the metered dose chamber are arranged at one end and the other end of the axial direction of the metered dose valve, and the chamber located at the other end is further divided into two compartments, an inner and an outer, which are connected to each other.

[0021] The sixth aspect of the present invention is a metered dose aerosol product according to the fifth invention, in which a valve for filling the liquid content is provided on the wall of a small chamber located on one end side of the axial direction of the metered dose valve in the metered dose chamber. [Effects of the Invention]

[0022] In the first aspect of the present invention, in a metered dose aerosol product, the metered dose chamber in the metered dose valve is formed from at least two small chambers, and depending on their positional relationship, for example, one of the small chambers can be designed to be larger, making it possible to design the internal volume of the metered dose chamber to be larger. When a fixed amount of contents is sprayed from the metering chamber to the nozzle of the spray mechanism, as mentioned above, a spray failure may occur in which the spray temporarily stops during one spray operation.However, in the present invention, this spray failure can be prevented by adding powder to the aerosol concentrate contained in the aerosol container.

[0023] In the second aspect of the present invention, the internal volume of the metering chamber is limited. That is, the internal volume (the total internal volume of the small chambers of the metering chamber) was limited to 0.8 mL or more. In the present invention, the internal volume of the metering chamber can be set extremely large; for example, the internal volume can be set to a large value of approximately 0.8 mL to 10.0 mL, and can be set large depending on the size of the container.

[0024] In the third aspect of the present invention, the powder in the aerosol concentrate is limited, that is, the powder is optimally at least one powder selected from the group consisting of anhydrous silicic acid and cyclodextrin.

[0025] In the fourth aspect of the present invention, the content of the powder is specified, and the content is set to 0.5 w / v % or less in the aerosol concentrate.

[0026] In the fifth aspect of the present invention, it is specified that at least two small chambers of the metered chamber are arranged at one end and the other end in the axial direction of the metered spray valve, and the small chamber located at the other end is further divided into two compartments, an inner and an outer chamber, which communicate with each other. Note that the one end is the side that is located on the spray mechanism side when the metered spray valve is installed in an aerosol product, and the other end is the opposite side. In this invention, the configuration of the metering chamber is more specific, and by dividing the small chamber located at the other end into two compartments, an inner and an outer chamber, the metering chamber can be made larger.

[0027] The sixth aspect of the present invention is limited to providing a filling valve for the liquid content on the wall of a small chamber located on one end side of the metering chamber of the metering valve, and the scope of the right includes the addition of a filling valve for filling the contents into the aerosol container. By reducing the sealing property inside the metering chamber, the occurrence rate of ejection failure can be reduced.

[0028] In the present invention having the above-described configuration, the internal volume of the metering chamber is increased, thereby eliminating the problem of poor injection. [Brief explanation of the drawings]

[0029] [Figure 1] FIG. 1 is a central vertical cross-sectional view of a first embodiment of a metered dose valve used in a metered dose aerosol product of the present invention, showing the inoperative and stored state. [Figure 2] FIG. 2 is a central vertical cross-sectional view showing the constant quantity injection valve according to the first embodiment in an actuated state. [Figure 3] FIG. 3 is a central vertical cross-sectional view of a constant quantity injection valve according to a second embodiment of the present invention, showing the inoperative and stored state. DETAILED DESCRIPTION OF THE INVENTION

[0030] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. In this specification, the side of the aerosol product where the spray mechanism is provided in the axial direction is referred to as the "one end side" and may be referred to as the "upper side," and the opposite side is referred to as the "other end side" and may be referred to as the "lower side." Directions such as "upper" and "lower" refer to the directions shown in the drawings unless otherwise specified.

[0031] (First embodiment) The metered dose aerosol product of the present invention (hereinafter also referred to simply as "the aerosol product of the present invention") comprises an aerosol container with an opening at one end that contains contents consisting of an aerosol concentrate and a propellant, a metered dose valve that is provided at one end of the aerosol container and has a metered dose chamber inside, and a spray mechanism that is connected to the valve stem of the metered dose valve.

[0032] FIG. 1 is a central longitudinal cross-sectional view of one embodiment of a metered dose valve used in the aerosol product of the present invention, showing the inoperative and stored state. FIG. 2 is a central vertical cross-sectional view showing the state during operation according to the embodiment.

[0033] These figures do not show the entire aerosol container, but instead show a metered dose valve 10 and a mounting cup 20 in which the metered dose valve 10 is mounted. The mounting cup 20 has an annular periphery with a through-hole approximately in the center. The metered dose valve 10 is mounted in the mounting cup 20 with the valve stem 12 protruding from the through-hole. The periphery of the mounting cup 20 is secured to the opening of an aerosol container (not shown) filled with the contents by crimping or the like, and an injection mechanism (not shown) is fitted onto the outwardly protruding valve stem 12 to produce the aerosol product. By pushing down on the injection mechanism from the outside, the valve stem 12 is pushed down, opening the discharge valve of the metered dose valve 10, and the contents of the aerosol product are ejected from the upper opening of the valve stem 12 by gas pressure.

[0034] The constant-volume injection valve 10 comprises a housing 11, a valve stem 12 that fits into the upper end of the housing 11, a coil spring 13 that acts as a biasing member that constantly biases the valve stem 12 upward, a metering chamber 15 that is located below the coil spring 13, a dip tube 17 that connects to the lower end 16 of the housing 11, and a shield member 18 that abuts against the lower end of the coil spring 13.

[0035] A flow passage is formed from the dip tube 17 through the housing 11 and up to the upper end opening 12k of the valve stem 12, through which the contents of the aerosol container circulate. In the inoperative state of Figure 1, this flow passage is sealed by the presence of the stem rubber 19 at the orifice 12h provided above the valve stem 12.

[0036] That is, in the non-operating state of Figure 1, the valve stem portion 12v at the lower end of the valve stem 12 is located at the uppermost position, and a gap is formed between this valve stem portion 12v and the annular valve portion 18v provided on the inner peripheral wall of the vertical through hole of the shield member 18 which interacts with this valve stem portion 12v to seal the flow passage, allowing the contents in the aerosol container to enter, accumulate and fill the metering chamber 15 and the flow passage.

[0037] More specifically, valve stem 12 is configured as a long rod with a hole 12t formed in its axial core as a flow passage extending upward from approximately the center, an orifice 12h drilled slightly below the center of hole 12t, and an annular flange 12f provided on the outer circumferential surface below the orifice 12h. A coil spring 13 is interposed between this annular flange 12f and the upper end surface of shield member 18 and serves as a biasing member.

[0038] Therefore, the valve stem 12 is always biased upward, and in the non-operated state of FIG. 1, the orifice 12h of the valve stem 12 is in a state where its flow passage is blocked and sealed by the presence of the stem rubber 19.

[0039] The housing 11 of the constant quantity injection valve 10 is fixed by being clamped at its upper edge by the approximate center of the mounting cup 20. Therefore, the stem rubber 19 is held between the inner peripheral edge of the upper end of the housing 11 and the mounting cup 20, and performs a sealing and opening action with the orifice 12h of the valve stem 12, thereby preventing and opening the flow of the contents in the aerosol container.

[0040] Next, the metering chamber 15, which is one of the characteristic features of the present invention, will be described in detail. A metering chamber 15 is provided in the lower part of the housing 11 of the metering valve 10 attached to the aerosol container. The metering chamber 15 is provided in the lower part of the housing 11, on the outer periphery of a lower flow passage 11t formed in the axial core thereof.

[0041] That is, it is provided outside the peripheral wall 11w of the lower flow passage 11t in the lower part of the housing 11. A passage 15t through which the contents flow into and out of the metered chamber 15 is formed on the ceiling portion 15s of the metered chamber 15 on the side of the peripheral wall 11w of the downward flow passage 11t.

[0042] Furthermore, the metered quantity chamber 15 is formed from two small chambers, and in the first embodiment, the metered quantity chamber 15 is formed from an inner metered quantity chamber 15i and an outer metered quantity chamber 15j. That is, the metered chamber 15 is divided into an inner metered chamber 15i and an outer metered chamber 15j by an annular partition wall 15k that hangs down from the top portion 15s of the metered chamber 15. Therefore, a passage 15t through which the content flows into and out of the metered quantity chamber 15 is formed at the upper end (top portion) of the inner metered quantity chamber 15i.

[0043] Between the annular partition wall 15k and the bottom surface of the metered chamber 15, there is provided a gap or a space serving as a communication passage, and the inner metered chamber 15i and the outer metered chamber 15j communicate with each other via this communication passage. If this gap is not provided, the inner metering chamber 15i and the outer metering chamber 15j will not communicate with each other, and one metering chamber 15 will not be formed. By providing the metered chamber 15 with a double structure of the inner metered chamber 15i and the outer metered chamber 15j in this way, the internal volume of the metered chamber 15 can be made large as needed.

[0044] Next, the operation of the constant quantity injection valve 10 according to the present invention will be described in detail with reference to FIG. FIG. 2 shows a state in which the valve stem 12 is pressed down in the direction of arrow D in the non-operated state of FIG. 1, and the content in the metered chamber 15 is discharged from the upper end opening 12k of the valve stem 12.

[0045] In detail, when the valve stem 12 is pressed in the direction of arrow D, the coil spring 13 contracts, and the valve shaft portion 12v at the lower part of the valve stem 12 engages with the annular valve portion 18v provided on the inner wall of the through hole of the shield member 18, thereby closing and sealing the flow passage.

[0046] At the same time, the orifice 12h of the valve stem 12 communicates with the upper flow passage 11r in the housing 11, and the contents stored inside the inner metering chamber 15i and the outer metering chamber 15j pass through the passage 15t provided in the ceiling 15s of the metering chamber 15, flow through the upper flow passage 11r in the housing 11, pass through the orifice 12h of the valve stem 12, pass through the hole 12t serving as a flow passage in the upper axial portion of the valve stem 12, and are discharged from the upper end opening 12k of the valve stem 12.

[0047] With the above-mentioned single pressing action, the contents in the metering chamber 15 and the upper flow passage 11r of the housing 11 are discharged and ejected, and by appropriately designing the internal volume of this metering chamber 15, it is possible to eject a constant larger amount of contents as needed.

[0048] In the present invention, the internal volume of the metering chamber 15 (the total internal volume of the small chambers of the metering chamber 15) is preferably 0.8 mL or more. If the internal volume is 0.8 mL or more, a sufficient feeling of use can be obtained and excessive use can be prevented. The internal volume can be appropriately set between 0.8 and 10.0 mL.

[0049] The reason why such a configuration of the metering chamber 15 is adopted here is not only to ensure an appropriate internal volume, as mentioned above, but also because the double structure of the metering chamber makes it possible to maintain the liquid and gas phase states of the contents stored therein in an appropriate state, thereby enabling the contents in the metering chamber to be discharged to the outside in a more nearly complete manner due to the pressure of the gas phase.

[0050] (Second embodiment) FIG. 3 is a central longitudinal cross-sectional view of a metered dose valve for an aerosol product according to a second embodiment of the present invention, showing the inactivated and stored state. The constant quantity injection valve 30 shown in FIG. 3 has the same basic structure as the first embodiment, and differs only in that a filling valve 33 is provided.

[0051] This filling valve 33 is used when filling the contents into an aerosol container, and is used when filling the contents into the aerosol container while pressing down the valve stem 12. This filling valve 33 consists of a circular belt 33b made of a flexible material and a side hole 33h, and by forcibly filling the contents, the seal between the circular belt 33b and the side hole 33h is released, and the contents are filled into the aerosol container. The other configurations are the same as those in the first embodiment, and therefore will not be described further.

[0052] In the present invention, the shape, size, material, etc. of the constant quantity injection valve can be selected and used as appropriate.

[0053] For example, in the first and second embodiments, with regard to sealing between the valve shaft portion 12v at the lower part of the valve stem 12 and the shield member 18, it is sufficient that the flow passage is sealed by pressing down the valve stem 12, and this can also be achieved by providing an annular valve portion inside the flow passage of the housing 11 without forming the shield member 18 separately.

[0054] Furthermore, in the above embodiment, the housing is manufactured by combining a lower member and an upper member, but this too can be freely designed and assembled.

[0055] The structure and construction of the aerosol container for the aerosol product according to the present invention have been explained above, and the contents thereof will now be explained.

[0056] The inventors' investigations have revealed that although the cause of poor spraying of metered-dose aerosol products is unknown, it is suspected that bumping of the contents, particularly the propellant, may be involved. In the present invention, the poor spraying was improved by mixing powders such as silicic anhydride or cyclodextrin into the aerosol concentrate.

[0057] The contents of the aerosol product of the present invention consist of an aerosol concentrate and a propellant. The aerosol concentrate contains a solvent, powder, active ingredient, etc.

[0058] <Solvent> Examples of solvents used in the aerosol concentrate include organic solvents and water. Examples of organic solvents include higher fatty acid esters and alcohols, or hydrocarbon solvents, glycol ethers having 3 to 6 carbon atoms, and ketone solvents. Higher fatty acid esters preferably have a total of 16 to 20 carbon atoms, such as isopropyl myristate, butyl myristate, hexyl laurate, and isopropyl palmitate. Among these, isopropyl myristate is particularly preferred. Examples of alcohols include lower alcohols having 2 to 3 carbon atoms, such as ethanol and isopropanol. Examples of hydrocarbon solvents include n-paraffin and isoparaffin. Examples of water include tap water, ion-exchanged water, pure water, and purified water. These solvents may be used alone or in combination.

[0059] <Powder> The powder may be any known powder, and its material, shape, particle size, particle structure, etc. may be appropriately selected. Examples include inorganic powders, organic powders, pigments, etc. Examples of inorganic powders include silicic acid anhydride (silica), titanium oxide, calcium carbonate, magnesium silicate, aluminum silicate, magnesium aluminometasilicate, titanium oxide, zeolite, talc, kaolin, mica, sericite, magnesium carbonate, calcium sulfate, hydroxyapatite, ceramic powder, boron nitride, and molybdenum disulfide. Examples of organic powders include cyclodextrin, polyamide resin powder, polyethylene powder, polystyrene powder, polymethyl methacrylate powder, cellulose powder, silicone resin powder, aluminum chlorhydrate, tolnaftate, lidocaine, and chlorhexidine gluconate. Examples of pigments include titanium dioxide, iron oxide, yellow iron oxide, carbon black, ultramarine blue, aluminum powder, and copper powder. These may be used alone or in combination of two or more. Among these, it is preferable to use at least one powder selected from the group consisting of silicic acid anhydride and cyclodextrin in order to improve the ejection failure of metered-dose aerosols.

[0060] The shape of the powder is not particularly limited, but examples thereof include spherical, rod-like, plate-like, needle-like, irregular, scaly, spindle-like, etc. Among these, spherical powder is preferred from the viewpoint of preventing clogging in the metered dose injection valve or injection mechanism.

[0061] The particle size of the powder is preferably 0.1 to 20 μm, more preferably 1 to 10 μm, and even more preferably 2 to 5 μm, in terms of average particle size. When the average particle size of the powder is within this range, the contents can be sprayed in a desired form such as a mist, without disrupting the spray pattern.

[0062] The specific surface area of ​​the powder is 100 to 1000 m 2 / g, and 100 to 800m 2 / g is more preferable, and 200 to 800m 2 When the specific surface area of ​​the powder is within the above range, poor jetting is easily improved.

[0063] The powder may be porous, non-porous, or hollow.

[0064] The powder content in the aerosol concentrate is preferably 0.001 to 5 w / v%, more preferably 0.005 to 1 w / v%, even more preferably 0.01 to 0.5 w / v%, and particularly preferably 0.05 to 0.5 w / v%. The effects of the present invention are easily achieved by including the powder at 0.001 w / v% or more, while poor spraying is easily improved at 5 w / v% or less.

[0065] <Active ingredient> The active ingredient is a component that is contained to impart a desired effect. The active ingredients include, for example, Pyrethroid compounds such as pyrethrins, allethrin, phthalthrin, resmethrin, furamethrin, fenothrin, permethrin, empenthrin, prallethrin, cyphenothrin, imiprothrin, transfluthrin, metofluthrin, and momfluorothrin; organophosphorus compounds such as fenitrothion, dichlorvos, chlorpyrifos-methyl, diazinon, and fenthion; carbamate compounds such as carbaryl and propoxur; peppermint oil, orange oil, fennel oil, cinnamon oil, clove oil, turpentine oil, eucalyptus oil, hiba oil, jasmine oil, neroli oil, peppermint oil, and bergamot oil. Various insecticidal essential oil components such as mott oil, butiglen oil, lemon oil, lemongrass oil, cinnamon oil, citronella oil, geranium oil, citral, l-menthol, citronellyl acetate, cinnamic aldehyde, terpineol, nonyl alcohol, cis-jasmone, limonene, linalool, 1,8-cineole, geraniol, α-pinene, p-menthane-3,8-diol, eugenol, menthyl acetate, thymol, benzyl benzoate, benzyl salicylate, and other insecticides such as methoprene, pyriproxyfen, metoxadiazone, fipronil, and amidoflumet. pest repellents such as p-menthane-3,8-diol, DEET, di-n-butyl succinate, hydroxyanisole, IR3535, and icaridin; Disinfectants such as phenol-based disinfectants such as triclosan, carbanilide-based disinfectants such as trichlorocarbanilide, pyridine-based disinfectants such as zinc pyrithione, cationic disinfectants such as cetylpyridinium chloride and benzalkonium chloride, and amine-based disinfectants such as trialkyltriamine, Natural fragrances consisting of essential oil components such as peppermint oil, peppermint oil, spearmint oil, rush, cypress, citronella, citral, citronellal, lemon, lemongrass, orange, eucalyptus, and lavender; artificial fragrances such as geraniol, citronellal, eugenol, undecalactone, limonene, and phenethyl alcohol; and compound fragrances obtained by adjusting these natural and artificial fragrances. Deodorizers such as various plant extracts such as persimmon extract, green tea extract, grapefruit extract, grapefruit seed extract, yuzu extract, moso bamboo extract, moso bamboo dry distillate, yuzu seed extract, orange extract, rooibos tea extract, yucca extract, olive leaf extract powder, chitosan, oolong tea extract, grape seed extract, mullion extract, perilla oil, tea dry distillate, licorice oil extract, perilla fruit extract, mustard extract, broccoli powder, ginger extract, snowbell extract, artemisia capillaris extract, magnolia extract, forsythia extract, rice husk extract, pepper extract, citrus seed extract, raw soybean extract, pimenta extract, fruit extract, and fruit seed extract etc.

[0066] The content of the active ingredient is not particularly limited as long as the desired effect is obtained, but for example, it is preferably 0.01 to 99.9 w / v% in the aerosol concentrate, more preferably 0.1 to 90 w / v%, and even more preferably 0.5 to 70 w / v%.

[0067] The aerosol concentrate can be obtained by mixing the liquid components other than the powder among the above-mentioned components and dispersing the powder.

[0068] <Propellant> Propellants used in the aerosol product of the present invention include liquefied petroleum gas (LPG), dimethyl ether (DME), hydrofluoroolefins such as trans-1,3,3,3-tetrafluoroprop-1-ene and trans-2,3,3,3-tetrafluoroprop-1-ene, nitrogen gas, carbon dioxide gas, nitrous oxide, compressed air, etc. The above propellants can be used alone or in a mixture, but those containing LPG or DME as the main component are preferred because of their ease of use.

[0069] The blending ratio of the aerosol concentrate to the propellant in the aerosol product may be appropriately determined depending on the desired spray form (size of spray particles, spray pattern, spray pressure, spray amount, etc.).

[0070] Although the embodiments of the present invention have been described above, the present invention can be modified in various ways. [Example]

[0071] Hereinafter, various powders were mixed into the contents of the aerosol product according to the present invention, and the results of evaluation tests on the spray state of the aerosol product will be described.

[0072] A. Evaluation test of various powders with base formulations at low temperatures <Method> (1) The sample (aerosol product) was stored upright overnight at 5°C. (2) The sample was taken out, sprayed immediately, and the spraying condition was confirmed. (3) After that, the same test was conducted a total of five times with an interval of at least one day. (4) The percentage of defective injections, where the entire fixed amount could not be injected without shaking, was calculated.

[0073] The formulations of the samples are shown in Tables 1 to 3 below. The active ingredient in the aerosol product was transfluthrin, an insecticide that kills flies, mosquitoes, cockroaches, etc. The types of powders tested are indicated in the test results table.

[0074] [Table 1]

[0075] [Table 2]

[0076] [Table 3]

[0077] Regarding aerosol containers: (a) Valve: 1 mL metered dose injection valve (first embodiment) / 1 mL metered dose injection valve with filling valve (second embodiment) (b) Injection mechanism: Press button with nozzle diameter φ2.0mm (c) Aerosol can: AE220 tin can (full capacity 289 mL)

[0078] The evaluation test results are as follows:

[0079] [Table 4]

[0080] Samples 1 and 2 are test results when an aerosol container equipped with a 1 mL metered dose injection valve with a filling valve (the second embodiment described above) was used and silicic anhydride was mixed into the aerosol concentrate. As can be seen from Table 4, in the case of sample 3 (without powder), ejection failure occurred 80% of the time when it was ejected, but no ejection failure was observed in samples 1 and 2.

[0081] [Table 5]

[0082] Samples 4 to 7 are test results for other silicic anhydride. From the results in Table 5, it can be seen that specimens 4 to 7 all had reduced jetting defects compared to specimen 3 (no powder), and in particular specimens 4 and 6 did not show any jetting defects.

[0083] [Table 6]

[0084] Samples 8 to 11 are similarly test results for powders other than silicic anhydride. The results in Table 6 show that specimens 8 to 11 all had reduced jetting defects compared to specimen 3 (no powder), and specimen 8 in particular did not show any jetting defects.

[0085] [Table 7]

[0086] Samples 12 to 15 show the test results for anhydrous silica with and without a filling valve attached; in other words, they show the test results for samples equipped with the metered dose injection valve according to the first embodiment (not equipped, 1 mL metered dose injection valve) and the second embodiment (equipped, 1 mL metered dose injection valve with filling valve). As can be seen from Table 7, all of Samples 12 to 15 were able to reduce the rate of ejection failure compared to Samples 16 and 17, which did not contain powder. Furthermore, Samples 16 and 17 had the same rate of ejection failure regardless of the metered injection valve, but when powder was contained, Samples 13 and 15, which were equipped with a metered injection valve with a filling valve, had a lower rate of ejection failure.

[0087] B. Evaluation tests on various other formulations <Method> (1) The specimen (aerosol product) was stored upright overnight under each temperature condition. (2) The sample was taken out, sprayed immediately, and the spraying condition was confirmed. (3) After that, with an interval of at least one day, the same test was performed five times on two to five tubes of each sample. (4) The percentage of defective injections, where the injection was not possible without shaking, was calculated.

[0088] The formulations of the samples are shown in Tables 8 to 10 below.

[0089] [Table 8]

[0090] [Table 9]

[0091] [Table 10]

[0092] Regarding aerosol containers: (a) Valve: 1 mL fixed dose injection valve (first embodiment) (b) Injection mechanism: Press button with nozzle diameter φ2.0mm (c) Aerosol can: AE220 tin can (full capacity 289 mL)

[0093] The evaluation test results are as follows:

[0094] [Table 11]

[0095] As can be seen from Table 11, the rate of poor spraying tends to decrease as the powder content in the aerosol concentrate increases. However, adding too much powder could cause the valve to malfunction (specifically, the valve stem to become sluggish), but this was hardly observed when the powder content in the aerosol concentrate was 0.5 w / v% or less in formulations 1 and 2, and 0.05 w / v% or less in formulation 3. Therefore, although it depends on the formulation, it was found that a powder content of 0.5 w / v% or less in the aerosol concentrate is particularly preferable in order to prevent valve malfunction.

[0096] As described above, in the present invention, the metering chamber within the metering valve of an aerosol product can be made larger, and in order to eliminate any resulting spraying problems, powder can be mixed into the contents, thereby eliminating the above-mentioned spraying problems, and a metered-dose aerosol product can be provided that can more completely eject the contents within the metering chamber.

[0097] Although the present invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the present invention. This application is based on a Japanese patent application (Patent Application No. 2017-233574) filed on December 5, 2017, the contents of which are incorporated herein by reference. [Explanation of symbols]

[0098] 10, 30 Metered injection valve 11. Housing 11r Upper flow passage 11t downward flow passage 11w surrounding wall 12 Valve stem 12h orifice 12k top opening 12t hole 12v valve stem part 13 Coil spring 15 Quantification room 15i Inner quantitative chamber 15j Outside quantitative chamber 15k circular partition wall 15s Tenbu 15t passage 17 Dip tube 18 Shielding material 18v annular valve 19 Stem Rubber 20 Mounting Cup

Claims

1. An aerosol product comprising an aerosol container containing a content consisting of an aerosol concentrate and a propellant, a metered-dose spray valve provided at one end of the aerosol container and having a metered-dose chamber therein, and a spray mechanism connected to the valve stem of the metered-dose spray valve, The volume of the metering chamber of the metering valve is 0.8 mL or more and 1 mL or less, The metering chamber is formed of at least two small chambers, and the small chambers are communicated with each other via a communication passage; At least two chambers of the metering chamber are arranged at one end side and the other end side in the axial direction of the metering injection valve, and the chamber located at the other end side is further divided into two compartments, an inner one and an outer one, which are in communication with each other; the communication passage communicates with the inner compartment, and the width of the communication passage is narrower than the width of the inner compartment; the small chamber located at the one end side and the small chamber located at the other end side are connected to each other via the communication passage, and the contents flow into and out of the small chamber located at the other end side via the communication passage; The aerosol concentrate contains a powder, the powder being anhydrous silicic acid, the content of the powder in the aerosol concentrate is 0.05 to 0.5 w / v %, and the content of the powder in the formulation is 0.0032 to 0.032 w / v %.

2. An aerosol product comprising an aerosol container containing a content consisting of an aerosol concentrate and a propellant, a metered-volume spray valve provided at one end of the aerosol container and having a metered-volume chamber therein, and a spray mechanism connected to the valve stem of the metered-volume spray valve, The volume of the metering chamber of the metering injection valve is 0.8 mL or more and 1 mL or less, The metering chamber is formed of at least two small chambers, and the small chambers are communicated with each other via a communication passage; At least two chambers of the metering chamber are arranged at one end side and the other end side in the axial direction of the metering injection valve, and the chamber located at the other end side is further divided into two compartments, an inner one and an outer one, which are in communication with each other; the communication passage communicates with the inner compartment, and the width of the communication passage is narrower than the width of the inner compartment; the small chamber located at the one end side and the small chamber located at the other end side are connected to each other via the communication passage, and the contents flow into and out of the small chamber located at the other end side via the communication passage; A metered dose aerosol product, wherein the aerosol concentrate contains a powder, the powder being cyclodextrin, the content of the powder in the aerosol concentrate is 0.05 w / v%, and the content of the powder in the formulation is 0.0032 w / v%.

3. 3. The metered dose aerosol product according to claim 1, wherein the powder has an average particle size of 2 to 5 μm.

4. A metered-volume aerosol product according to any one of claims 1 to 3, wherein a valve for filling the liquid content is provided on the wall of a small chamber located on one end side of the axial direction of the metered-volume injection valve of the metered-volume chamber.

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