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WO2023066897A1 - Utilisation d'une composition d'aérosol et procédé de lutte contre les insectes volants cachés - Google Patents

Utilisation d'une composition d'aérosol et procédé de lutte contre les insectes volants cachés Download PDF

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Publication number
WO2023066897A1
WO2023066897A1 PCT/EP2022/078904 EP2022078904W WO2023066897A1 WO 2023066897 A1 WO2023066897 A1 WO 2023066897A1 EP 2022078904 W EP2022078904 W EP 2022078904W WO 2023066897 A1 WO2023066897 A1 WO 2023066897A1
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WO
WIPO (PCT)
Prior art keywords
composition
aerosol
total weight
insects
droplets
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2022/078904
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English (en)
Inventor
Mario Abela
Avijit DAS
Alastair Robin DYSON
Rodrigo Alves HELENO
Lakshay JOSHI
Anil Kumar MAKKAPATI
Mariana Even Oliveira MARTINS
Niemiec ANNA
Scott RUDKIN
Shanthakumar SHANMUGAM PERUMAL
Daniel James SHEEHY
Rafael VERONEZE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Reckitt and Colman Overseas Hygiene Home Ltd
Original Assignee
Reckitt and Colman Overseas Hygiene Home Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from EP21215093.2A external-priority patent/EP4165988A1/fr
Application filed by Reckitt and Colman Overseas Hygiene Home Ltd filed Critical Reckitt and Colman Overseas Hygiene Home Ltd
Priority to AU2022373901A priority Critical patent/AU2022373901A1/en
Publication of WO2023066897A1 publication Critical patent/WO2023066897A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01P—BIOCIDAL, PEST REPELLANT, PEST ATTRACTANT OR PLANT GROWTH REGULATORY ACTIVITY OF CHEMICAL COMPOUNDS OR PREPARATIONS
    • A01P7/00—Arthropodicides
    • A01P7/04—Insecticides
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
    • A01N25/02—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests containing liquids as carriers, diluents or solvents
    • A01N25/04—Dispersions, emulsions, suspoemulsions, suspension concentrates or gels
    • A01N25/06—Aerosols

Definitions

  • the present invention relates to the use of an aerosol composition to kill, knockdown and/or repel hidden flying insects, in particular, mosquitoes.
  • the invention also relates to a method of killing, repelling and/or reducing the quantity of insects in the air, wherein the insects are hidden flying insects.
  • the present invention relates to the use of an aerosol composition to kill, knockdown and/or repel hidden flying insects, in particular, mosquitoes.
  • the droplets are imparted with an electrostatic charge on spraying from an aerosol spray device and in which the electrostatic charge on the droplets is maximized through the inclusion in the compositions of certain selected components and the characteristics of the aerosol spray device.
  • Aerosol spray devices are a convenient form in which a variety of useful products, such as insecticides, air fresheners, antiperspirants, hair sprays, horticultural products, waxes and polishes, oven cleaners, starches and fabric finishes, shoe and leather care products, glass cleaners and various other household, institutional, professional or industrial products, can be dispensed.
  • useful products such as insecticides, air fresheners, antiperspirants, hair sprays, horticultural products, waxes and polishes, oven cleaners, starches and fabric finishes, shoe and leather care products, glass cleaners and various other household, institutional, professional or industrial products, can be dispensed.
  • aerosol spray devices resides in the ability to readily deliver the composition contained within the device in the form of fine droplets to the target area, for example the spraying of an insecticide onto target insects.
  • WO 99/01227 there is described a method of killing flying insects by liquid droplets of an insecticidal composition onto the insects.
  • a unipolar charge is imparted to the liquid droplets by double layer charging and charge separation during spraying, the unipolar charge being at a level such that the said liquid droplets have a charge to mass ratio of at least +/- 1 x 10 -4 C/kg.
  • An apparatus for imparting the unipolar charge of this magnitude to a liquid composition is also described.
  • WO 01/18145 there is described an electrically neutral composition in the form of a water-in-oil or oil-in-water emulsion, in which the droplets of the emulsion on discharge from an aerosol spray device are imparted with a unipolar electrostatic charge.
  • the liquid droplets have a charge to mass ratio of at least +/- 1 x 10 -4 C/kg. The higher the charge to mass ratio of the liquid droplets, the more effective the liquid droplets will be for their intended use, such as precipitating airborne particles and targeting insects.
  • aqueous pressurized spray composition comprising a pyrethroid, an ortho-substituted phenol, a non-ionic surfactant and a propellant. This composition exhibits good flushing characteristics against crawling insects.
  • Pest control products when used against mosquitoes in free-living adult stages, can be applied in two ways: i) release into the air in the form of a vapour or aerosol, or ii) application to a surface as a spray or deposit or impregnation for prolonged action.
  • an object of the present invention to provide the use of an aerosol composition to kill, knockdown and/or repel hidden flying insects, in particular, mosquitoes.
  • the present inventors have found that by charging the liquid droplets of a water-in-oil or an oil-in-water composition during the spraying operation the composition has a better dispersion in the air, and it can reach hidden flying insects, in particular, mosquitoes.
  • the present invention relates to the use of an aerosol composition to kill, knockdown and/or repel hidden flying insects, in particular, mosquitoes, wherein the composition is an electrically neutral composition in the form of a water-in-oil or an oil-in- water emulsion, in which droplets of the emulsion on discharge from an aerosol spray device are imparted with a unipolar electrostatic charge, which composition comprises: a) at least one propellant in an amount of from 2 to 80 wt.%, based on the total weight of the composition; b) at least one non-ionic surfactant in an amount of from 0.01 to 10 wt.%, based on the total weight of the composition; c) one or more oils or solvents, preferably aliphatic, linearly conjugated or aromatic, within the oil phase in an amount of up to 80 wt.%, based on the total weight of the composition preferably up to 40 wt.%, more preferably up to 20 wt.%, even more
  • the composition comprises between 10 wt.% and 80 wt.% of water, based on the total weight of the composition, preferably between 20 wt.% and 75 wt.%, more preferably between 30 wt.% and 70 wt.%, even more preferably between 40 wt.% and 65 wt.%, most preferably between 45 wt.% and 60 wt.%, such as for example, between 50 wt.% and 55 wt.%.
  • the at least one non-ionic surfactant is selected from the group consisting of polyglyceryl fatty acid esters, polyoxyethylene sorbitan monooleate, sorbitan monooleate, and combinations thereof.
  • the one or more oils or solvents are selected from the group consisting of n-paraffins and iso-paraffins.
  • the at least one insecticidal compound is selected from the group consisting of cypermethrin, tetramethrin, permethrin, cyfluthrin, transfluthrin, allethrins, and combinations thereof; preferably selected from the group consisting of permethrin, cyfluthrin, transfluthrin, allethrins, and combinations thereof; more preferably selected from the group consisting of permethrin, cyfluthrin, transfluthrin, bioallethrin, esbiothrin, and combinations thereof; even more preferably selected from the group consisting of permethrin, cyfluthrin, transfluthrin, esbiothrin, and combinations thereof.
  • the insecticidal compound comprises or consists of: allethrins, preferably esbiothrin, and permethrin, or permethrin and transflutrin, or cyfluthrin and transfluthrin.
  • the composition comprises between 0.001 wt.% and 10 wt.% of the at least one insecticidal compound, based on the total weight of the composition, preferably between 0.005 wt.% and 5 wt.%, more preferably between 0.01 wt.% and 1 wt.%, even more preferably between 0.05 wt.% and 0.5%, most preferably between 0.05 wt.% 0.25 wt.%.
  • the flying insects are mosquitoes, preferably mosquitoes of the genus Aedes, more preferably of the species Aedes aegypti.
  • the present invention relates to a method of killing, repelling and/or reducing the quantity of insects in the air, wherein the insects are hidden flying insects; the method comprising spraying into the air an aerosol composition, wherein the composition is sprayed from an aerosol spray device which is mechanically operated under pressure, the aerosol spray device comprising: i) a reservoir for accommodating the aerosol composition; ii) a spraying head, in the form of an insert in an actuator, through which the aerosol composition is expelled in the form of a spray of droplets; and iii) a conduit system for feeding the aerosol composition from the reservoir to the spraying head wherein: a) the spraying head has a bore through which the aerosol composition is expelled from the apparatus, the bore having an outlet having an L/a ratio of at least 10, where L is the length of the periphery defining the bore outlet in mm and a is the cross sectional area of the bore outlet in mm 2 ; and b) the apparatus is constructed such that the drop
  • At least one non-ionic surfactant in an amount of from 0.01 wt.% to 10 wt.%, based on the total weight of the composition, preferably between 0.05 wt.% and 8 wt.%, more preferably between 0.1 wt.% and 6 wt.%, even more preferably between 0.25 wt.% and 4 wt.%, most preferably between 0.25 wt.% and 2.5 wt.%; c) one or more oils or solvents, preferably aliphatic, linearly conjugated or aromatic, within the oil phase in an amount of up to 80 wt.%, based on the total weight of the composition, preferably up to 40 wt.%, more preferably up to 20 wt.%, even more preferably between 1 wt.% and 15 wt.%, most preferably between 2.5 wt.% and 10 wt.%; d) at least one insecticidal compound; and e) water.
  • the L/a ratio is at least 12.
  • the vapour phase tap has a diameter of between 0.60 mm and 2mm, more preferably between 0.65 mm and 1.5 mm, even more preferably between 0.7 mm and 1.25 mm, most preferably between 0.7 mm and 1.1 mm.
  • the insert is made of a polymeric material, preferably a polymeric material selected from the group consisting of acetal, polyester, polyvinyl chloride, nylon, polypropylene, and combinations thereof, more preferably the insert is made of acetal.
  • the flow rate of the aerosol composition sprayed from the aerosol spray device is of at least 1 g/s, preferably between 1 g/s and 10g/s, more preferably between 1 .25 g/s and 5 g/s, even more preferably between 1 .5 g/s and 2.5 g/s.
  • the composition is sprayed into the air in a room having a volume of at most 100 m 3 , preferably at most 75 m 3 , more preferably at most 50 m 3 , even more preferably at most 30 m 3 , most preferably at most 20 m 3 .
  • the composition is sprayed into the air at a distance of at least 1 m from the place where the flying insects are located, preferably at least 1.5 m, more preferably at least 2 m, even more preferably at a distance between 2 m and 3 m .
  • Hidden flying insects as used in the present application means: flying insects that are not visible to the normal eye having 20/20 vision and therefore a pest control composition cannot be directly applied onto them. In other words, these are insects located, for example, behind a curtain, inside a piece of furniture, or behind or between clothes.
  • “Knock-down test for hidden insects” as used in the present application means: experiments performed in a 20m 3 chamber having a mini chamber of 10cm x 10cm x 10cm size (1 x 10 -3 m 3 ).
  • the mini chamber is located on a wall of the 20m 3 chamber and 1 m above the ground, i.e., the mini chamber is located substantially in the middle of a wall of the 20m 3 chamber.
  • a curtain made of a textile, for example polyester, is placed in the centre of the 20m 3 chamber and 2m away from the spraying point.
  • the mini chamber has apertures which enable air flow into and through the mini chamber. 5 female Aedes aegypti mosquitoes are released inside the mini chamber. The mosquitoes are 3-5 days old.
  • the aerosol compositions are tested by spraying the compositions at 2m in direction to the small chamber, which is located behind the curtain.
  • the aerosol composition is sprayed for about 3 seconds.
  • a trained experimenter enters the chamber and records the knock-down values inside the chamber at 1 -minute interval up to 10 minutes; after this, the values are recorded at 5-minute interval until the knock-down percentage is 100 (100% KD) or 30 minutes post spraying, whichever occurs first.
  • “Knock-down percentage” or “% KD”, as used in the present application means: the percentage of insects that after contact with a (sub)lethal dose of an insect control composition cannot move, take off or stand, with respect to the initial number of insects at the beginning of an experiment.
  • the present invention relates to the use of an aerosol composition to kill, knockdown and/or repel hidden flying insects, wherein the composition is an electrically neutral composition in the form of a water-in-oil emulsion or an oil-in-water emulsion, in which droplets of the emulsion on discharge from an aerosol spray device are imparted with a unipolar electrostatic charge, which composition comprises: a) at least one propellant in an amount of from 2 wt.% to 80 wt.%, based on the total weight of the composition; preferably between 10 wt.% and 70 wt.%, more preferably between 20 wt.% and 60 wt.%, even more preferably between 30 wt.% and 50 wt.%, most preferably between 35 wt.% and 45 wt.%.
  • At least one non-ionic surfactant in an amount of from 0.01 wt.% to 10 wt.%, based on the total weight of the composition, preferably between 0.05 wt.% and 8 wt.%, more preferably between 0.1 wt.% and 6 wt.%, even more preferably between 0.25 wt.% and 4 wt.%, most preferably between 0.25 wt.% and 2.5 wt.%; c) one or more oils or solvents, preferably aliphatic, linearly conjugated or aromatic, within the oil phase in an amount of up to 80 wt.%, based on the total weight of the composition, preferably up to 40 wt.%, more preferably up to 20 wt.%, even more preferably between 1 wt.% and 15 wt.%, most preferably between 2.5 wt.% and 10 wt.%; d) at least one insecticidal compound; and e) water.
  • the electron transfer through the emulsion leads to liquid droplets of the water-in-oil or the oil-in-water composition, which become charged during the spraying operation; this enables a better dispersion of the composition in the air, and hence, it can reach hidden flying insects, in particular, mosquitoes.
  • propellants are used in the composition of the invention in a total amount of from 2 wt.% to 80 wt.%.
  • propellants that may be used are hydrocarbons and compressed gas, of which hydrocarbons are preferred.
  • Hydrocarbon propellants which may be used are acetylene, methane, ethane, ethylene, propane, nbutane, n-butene, isobutane, isobutene, pentane, pentene, isopentane and isopentene. Mixtures of these propellants may also be used.
  • Commercially available propellants typically contain a number of hydrocarbon gases. For example, an odorised commercial butane, contains predominantly n-butane and some iso-butane together with small amounts of propane, propene, pentane and butene.
  • Preferred hydrocarbon propellants include propane, n-butane, isobutane, pentane and isopentane, whilst the most preferred are propane, iso-butane and n-butane.
  • Particularly preferred hydrocarbon propellants are mixtures of propane, n-butane and iso-butane.
  • the propellant is liquefied petroleum gas, also known as LPG and LP gas.
  • the aerosol composition comprises at least one propellant in an amount of from 2 wt.% to 80 wt.%, based on the total weight of the composition; preferably between 10 wt.% and 70 wt.%, more preferably between 20 wt.% and 60 wt.%, even more preferably between 30 wt.% and 50 wt.%, most preferably between 35 wt.% and 45 wt.%.
  • Non-ionic surfactants for use in the present invention include mono, di and tri sorbitan esters, polyoxyethylene mono, di and tri sorbitan esters; mono and polyglyceryl esters; alkoxylated alcohols; alkoxylated amines; alkoxylated acids; amine oxides; ethoxylated/proproxylated block copolymers; alkoxylated alkanolamides; and alkoxylated alkyl phenols.
  • the at least one non-ionic surfactant is selected from the group consisting of polyglyceryl fatty acid esters, polyoxyethylene sorbitan monooleate, sorbitan monooleate, and combinations thereof. Particularly preferred are those surfactants which contain at least one alkyl, allyl or substituted phenyl group containing at least one C 6 to C22 carbon chain. Examples are esters with C10-C22 fatty acids, preferably C12-C18 fatty acids, particularly polyglycerol oleate and ethoxylated fatty alcohols, such as oleyl alcohol ethoxylated with two moles of ethylene oxide. Further examples are the polyethylene glycol oleates, such as PEG-4 oleate, PEG-8 oleate and PEG-12 oleate.
  • the aerosol composition comprises at least one non-ionic surfactant in an amount of from 0.01 wt.% to 10 wt.%, based on the total weight of the composition, preferably between 0.05 wt.% and 8 wt.%, more preferably between 0.1 wt.% and 6 wt.%, even more preferably between 0.25 wt.% and 4 wt.%, most preferably between 0.25 wt.% and 2.5 wt.%
  • the aerosol composition comprises one or more oils or solvents, preferably aliphatic, linearly conjugated or aromatic, within the oil phase in an amount of up to 80 wt.%, based on the total weight of the composition, preferably up to 40 wt.%, more preferably up to 20 wt.%, even more preferably between 1 wt.% and 15 wt.%, most preferably between 2.5 wt.% and 10 wt.%.
  • the solvent will be water immiscible.
  • oils or solvent materials may be used, although care should be exercised to ensure that the solvent does not adversely interact with any active components of the compositions of the invention, such as insecticides.
  • liquid n-paraffins liquid n-paraffins
  • liquid isoparaffins liquid isoparaffins, cycloalkanes, naphthene-containing solvents, white spirit, kerosene, ester solvents, silicone solvents or oils, fatty acids, dialkyl phthalates, C5-C11 alcohols and fatty alcohols.
  • o liquid n-paraffins - NorparTM 12, NorparTM 13 and NorparTM 15 available from Exxon
  • o liquid isoparaffins - Isopar TM G, Isopar TM H, IsoparTM L, IsoparTM M and IsoparTM V available from Exxon).
  • Preferred solvents are liquid hydrocarbon solvents, n-paraffins, and iso-paraffins.
  • the one or more oils or solvents are selected from the group consisting of n-paraffins and iso-paraffins.
  • pyrethroids particularly synthetic pyrethroids, chlorpyrifos, propoxur and diazinon are preferred.
  • the at least one insecticidal compound is selected from the group consisting of cypermethrin, tetramethrin, permethrin, cyfluthrin, transfluthrin, allethrins, and combinations thereof; preferably selected from the group consisting of permethrin, cyfluthrin, transfluthrin, allethrins, and combinations thereof; more preferably selected from the group consisting of permethrin, cyfluthrin, transfluthrin, bioallethrin, esbiotrhin, and combinations thereof; even more preferably selected from the group consisting of permethrin, cyfluthrin, transfluthrin, esbiotrhin, and combinations thereof.
  • the aerosol composition may comprise between 0.001 wt.% and 10 wt.% of the at least one insecticidal composition, based on the total weight of the composition, preferably between 0.005 wt.% and 5 wt.%, more preferably between 0.01 wt.% and 1 wt.%, even more preferably between 0.05 wt.% and 0.5%, most preferably between 0.05 wt.% 0.25 wt.%.
  • insecticidal compounds will include an insecticide which functions primarily to knock down an insect, together with a second insecticide which functions primarily as a kill agent.
  • insecticide which functions primarily to knock down an insect
  • a second insecticide which functions primarily as a kill agent.
  • An example of such a combination is the use of permethrin as a kill agent in a combination with tetramethrin as a knock down agent.
  • Allethrins preferably esbiothrin, and permethrin, or
  • compositions of the present invention may be incorporated into various optional ingredients.
  • synergists such as N-octylbicycloheptene dicarboximide and piperonyl butoxide may be included at a concentration of from 0.5 wt.% to 1.5 wt.%, based on the total weight of the composition, most preferably about 1 .0 wt.%, for use in conjunction with pyrethroid insecticides.
  • ingredients including corrosion inhibitors, such as 1 -hydroxyethyl-2- heptadecenyl imidazoline and/or sodium benzoate, preferably in a concentration from 0.01 to 0.5 wt.%, preservatives and antioxidants, such as butylated hydroxytoluene, may be used as required.
  • corrosion inhibitors such as 1 -hydroxyethyl-2- heptadecenyl imidazoline and/or sodium benzoate
  • preservatives and antioxidants such as butylated hydroxytoluene
  • One or more fragrance components may also be included, according to the particular consumer requirements.
  • the composition according to the invention comprises water.
  • the composition comprises between 10 wt.% and 80 wt.% of water, based on the total weight of the composition, preferably between 20 wt.% and 75 wt.%, more preferably between 30 wt.% and 70 wt.%, even more preferably between 40 wt.% and 65 wt.%, most preferably between 45 wt.% and 60 wt.%, such as for example, between 50 wt.% and 55 wt.%.
  • the present invention relates to a method of killing, repelling and/or reducing the quantity of insects in the air, wherein the insects are hidden flying insects; the method comprising spraying into the air an aerosol composition, wherein the composition is sprayed from an aerosol spray device which is mechanically operated under pressure, the aerosol spray device comprising: i) a reservoir for accommodating the aerosol composition; ii) a spraying head, in the form of an insert in an actuator, through which the aerosol composition is expelled in the form of a spray of droplets; and iii) a conduit system for feeding the aerosol composition from the reservoir to the spraying head wherein: a) the spraying head has a bore through which the aerosol composition is expelled from the apparatus, the bore having an outlet having an L/a ratio of at least 10, where L is the length of
  • At least one non-ionic surfactant in an amount of from 0.01 wt.% to 10 wt.%, based on the total weight of the composition, preferably between 0.05 wt.% and 8 wt.%, more preferably between 0.1 wt.% and 6 wt.%, even more preferably between 0.25 wt.% and 4 wt.%, most preferably between 0.25 wt.% and 2.5 wt.%; c) one or more oils or solvents, preferably aliphatic, linearly conjugated or aromatic, within the oil phase in an amount of up to 80 wt.%, based on the total weight of the composition, preferably up to 40 wt.%, more preferably up to 20 wt.%, even more preferably between 1 wt.% and 15 wt.%, most preferably between 2.5 wt.% and 10 wt.%; d) at least one insecticidal compound; and e) water.
  • the aerosol composition is in the form of a water-in-oil emulsion. This reduces chemical interaction of the reservoir that accommodates the composition.
  • Spraying apparatus for producing a spray of liquid droplets are well known.
  • such apparatus is known in the domestic environment for producing sprays of droplets of insecticides or polish or air freshening compositions.
  • such apparatus includes a reservoir for accommodating the liquid composition to be sprayed, a spraying head including a bore through which the composition is expelled in the form of a spray of droplets, and a conduit system whereby the composition can pass from the reservoir to the spraying head.
  • the apparatus may preferably be in the form of an aerosol in which case it includes gas under pressure, possibly in a liquid state, which expels the liquid composition (to be sprayed) from the reservoir to the spraying head and then out of the spraying head in the form of a spray of droplets.
  • the droplets leaving the spraying head have a small electrostatic charge created by electron transfer between the liquid and the walls of the apparatus.
  • the liquid droplets that are expelled from the spraying head have a charge to mass ratio of at least +/- 1 x 10 4 C/kg, preferably at least +/- 1 .5 x 10 -4 C/kg.
  • This charge level is considerably higher than the charge level which is achieved when spraying conventional liquid formulations from conventional aerosol spray device where charge levels of the order of +/- 1 x 10 -5 to +/- 1 x 10 -8 C/kg are obtained.
  • the bore outlet is the end of the bore through which the composition is expelled in the form of a spray from the device.
  • the spray rate is maintained at least at 0.5 g/s.
  • this spray rate can only be achieved at the same time as achieving the charge required by the present invention by using propellant at a much higher pressure than that which is normally used in spray devices, i.e., typically 40 psi.
  • propellant at a much higher pressure than that which is normally used in spray devices, i.e., typically 40 psi.
  • orifices which have a tortuous periphery are used whilst maintaining a large cross-sectional area. In this manner, the spray rate can be maintained at above 0.5 g/s using propellant pressures normally used in spray devices.
  • the propellant when the propellant is LPG, a pressure of at least 46 psi in the device is needed to obtain the desired charge levels in the droplets leaving the spraying head.
  • the propellant comprises or consists of LPG and the pressure in the aerosol spray device is of at least 46 psi.
  • the periphery of the bore outlet is thus preferably tortuous and the flow of the liquid over the tortuous surface assists in the liquid becoming charged by double layer charging.
  • Using a bore with tortuous periphery can lead to a L/a ratio that is too low, causing that the flow rate of the droplets expelled from the spraying head be lower than 0.5 g/s.
  • the aerosol spray device should be constructed in such a way that the L/a ratio is of at least 10 and the flow rate of the droplets that are expelled from the spraying head is of at least 0.5 grams per second.
  • the L/a ratio is of at least 12.
  • the flow rate of the aerosol composition sprayed from the aerosol spray device is of at least 1 g/s, preferably between 1 g/s and 10g/s, more preferably between 1 .25 g/s and 5 g/s, even more between 1 .5 g/s and 2.5 g/s.
  • the aerosol spray device includes a gas under pressure, for example liquefied petroleum gas, e.g., butane and/or propane, LPG, in the reservoir.
  • the spraying head of the device forms part of an actuator, operable by the user, of a valve assembly to cause the composition in the reservoir to be expelled from the spraying head in the form of droplets.
  • the actuator operable by the user, of a valve assembly to cause the composition in the reservoir to be expelled from the spraying head in the form of droplets.
  • the aerosol spray device is preferably in the form of an aerosol can which is of a size suitable to be held in the hand and used in domestic situations.
  • the actuator generally comprises a body portion including a recess for accommodating the insert (as a part of the spraying head) including the bore and preferably a swirl chamber through which the liquid passes prior to reaching the bore.
  • the recess is in communication with a valve stem communicating with a tail piece which in turn is in communication with a dip tube extending into the reservoir.
  • the composition can pass from the reservoir to the bore of the spraying head via conduit system comprising the dip tube, the tail piece, the valve stem, the actuator recess and the nozzle swirl chamber (if present).
  • the valve stem includes one or more orifices linking the valve stem with the tail piece and the tail piece includes one or more orifices linking the tail piece with the dip tube and the nature of these orifices and the diameter of the dip tube influence the charge given to the liquid. More particularly, the smaller the size of the or each stem orifice and the fewer the stem orifices, the greater is the contact area between the valve stem and the composition and hence the greater is the charge in the composition.
  • the aerosol spray device has a vapour phase tap, which influences the turbulence.
  • a vapour tap is quite conventional in aerosol spraying apparatus and it comprises an orifice enabling the gas pressure to act directly on the composition in the conduit system linking the reservoir and the spraying head bore.
  • the orifice is provided in the tail piece of the valve assembly.
  • the vapour phase tap has a diameter of at least 0.60 mm, preferably between 0.60 mm and 2 mm, more preferably between 0.65 m and 1.5 mm, even more preferably between 0.7 mm and 1 .25 mm, most preferably between 0.7 mm and 1.1 mm.
  • the degree of turbulence experienced by the composition as it flows through the spray device influences the charge on the liquid droplets leaving the spraying head.
  • the turbulence is able to dissipate the electrical charge of the double layer, that forms at the liquid/apparatus interface, more effectively within the bulk of the liquid thereby encouraging further electron transfer between the composition and device.
  • the degree of turbulence by increasing the degree of turbulence, the charge of the liquid droplets leaving the spraying head is increased.
  • the actuator of the aerosol spray device has an insert, which may be made of any polymeric material, such as acetal, polyester, polyvinyl chloride (PVC), nylon or polypropylene.
  • the insert is made of acetal.
  • the actuator is made of polypropylene and the insert is made of acetal.
  • the insert has a bore, which has a diameter of between 0.5 mm and 3.0 mm, preferably between 0.75 mm and 2.5 mm, more preferably between 1 .0 mm and 2.0 mm, even more preferably between 1 .5 and 2.0 mm.
  • the actuator is made of polypropylene and the insert is made of acetal, wherein the actuator has an insert having a bore with a diameter of between 0.5 mm and 3.0 mm, preferably between 0.75 mm and 2.5 mm, more preferably between 1 .0 mm and 2.0 mm, even more preferably between 1 .5 and 2.0 mm.
  • the characteristics of the dip tube can be optimised to increase charge levels in the liquid sprayed from the container.
  • a narrow dip tube of for example about 1.27 mm internal diameter, increases the charge levels on the liquid.
  • the liquid droplets sprayed from the aerosol spray device will generally have an average droplet size (diameter) in the range of from 5 pm to 100 pm, with a peak of droplets of about 40 micrometres.
  • the liquid droplets sprayed from the aerosol spray device have an average particle size (diameter) of between 10 pm to 100 pm, preferably between 20 pm to 80 pm, more preferably between 25 pm to 60 pm, even more preferably between 30 pm to 50 pm.
  • the aerosol composition may be sprayed into the air in a room having a volume of at most 100 m 3 , preferably at most 75 m 3 , more preferably at most 50 m 3 , even more preferably at most 30 m 3 , most preferably at most 20 m 3 . It will be understood that the aerosol composition is not sprayed directly onto the flying insects as the insects will be hidden, e.g., located behind a curtain, inside a piece of furniture, or behind or between clothes.
  • the total amount of aerosol composition that is sprayed in one application of the aerosol may be between 0.5 g and 30 g, preferably between 1 g and 20 g, more preferably between 2.5 g and 15 g, even more preferably between 3 g and 10 g, most preferably between 4 g and 8 g.
  • the aerosol composition may be sprayed into the air at a distance of at least 1 m from the place where the flying insects are located, preferably at least 1 .5 m, more preferably at least 2 m, even more preferably at a distance between 2m and 3m.
  • Figure 1 is a diagrammatic cross-section through an aerosol spray device; and Figure 2 is a cross-section through the valve assembly of Figure 1 illustrating some of the components in greater detail.
  • Figures 1 and 2 show an aerosol spray device as used in the method according to the invention. It comprises a can 1 , which may be formed of aluminium or lacquered or unlacquered tin plate or the like in conventional manner, defining a reservoir 2 for an aerosol composition 3 which is an electrically neutral composition in the form of a water- in-oil or an oil-in-water emulsion, in which droplets of the emulsion on discharge from the aerosol spray device are imparted with a unipolar electrostatic charge. Also located in the can is a gas under pressure which is capable of forcing the aerosol composition 3 out of the can 1 via a conduit system comprising a dip tube 4 and a valve and actuator assembly 5.
  • a conduit system comprising a dip tube 4 and a valve and actuator assembly 5.
  • the dip tube 4 includes one end 6 which terminates at a bottom peripheral part of the can 1 and another end 7 which is connected to a tail piece 8 of the valve assembly.
  • the tail piece 8 is secured by a mounting assembly 9 fitted in an opening in the top of the can and includes a lower portion 10 defining a tail piece orifice 11 to which end 7 of the dip tube 4 is connected.
  • the tail piece includes a bore 12 of relatively narrow diameter at lower portion 11 and a relatively wider diameter at its upper portion 13.
  • the valve assembly also includes a stern pipe 14 mounted within the bore 12 of the tail piece and arranged to be axially displaced within the bore 12 against the action of spring 15.
  • the valve stern 14 includes an internal bore 16 having one or more lateral openings (stern holes) 17 (see Figure 2).
  • the valve assembly includes an actuator 18 having a central bore 19 which accommodates the valve stern 14 such that the bore 16 of the stem pipe 14 is in communication with bore 19 of the actuator.
  • a passage 20 in the actuator extending perpendicularly to the bore 19 links the bore 19 with a recess including a post 21 on which is mounted a spraying head in the form of an insert 22 including a bore 23 which is in communication with the passage 20.
  • a ring 24 of elastomeric material is provided between the outer surface of the valve stern 14 and, ordinarily, this sealing ring closes the lateral opening 17 in the valve stern 14.
  • the construction of the valve assembly is such that when the actuator 18 is manually depressed, it urges the valve stern 14 downwards against the action of the spring 15 as shown in Figure 2 so that the sealing ring 24 no longer closes the lateral opening 17.
  • a path is provided from the reservoir 2 to the bore 23 of the spraying head so that liquid can be forced, under the pressure of the gas in the can, to the spraying head via a conduit system comprising the dip tube 4, the tail piece bore 12, the valve stem bore 16, the actuator bore 19, and the passage 20.
  • An orifice 27 (not shown in Figure 1 ) is provided in the wall of the tail piece 8 and constitutes a vapour phase tap whereby the gas pressure in the reservoir 2 can act directly on the liquid flowing through the valve assembly. This increases the turbulence of the liquid.
  • the lateral opening 17 linking the valve stem bore 16 to the tail piece bore 12 is in the form of 2 orifices each having a diameter of not more than 0.51 mm to enhance electrostatic charge generation.
  • the diameter of the dip tube 4 is preferably as small as possible, for example 1.2mm, in order to increase the charge imparted to the liquid. Also, charge generation is enhanced if the diameter of the tail piece orifice 11 is as small as possible e.g., not more than about 0.6mm.
  • compositions were prepared by firstly mixing the at least one non-ionic surfactant, the one or more oils or solvents and the at least one insecticidal compound to form a first mixture.
  • the first mixture is then mixed with water to product a water-in-oil emulsion, which is the filled into cans and blended with the at least one propellant.
  • the oil or solvent is selected from n-paraffin, iso-paraffin, and combinations thereof.
  • the non-ionic surfactant is selected from: Cithrol PG430, Polyglycerol oleate ester, lauryl pyrrolidone, Tween 80, Span 20, and combinations thereof.
  • the additives are selected from: preservatives such as butylated hydroxytoluene, alcohols and aromatic organic compounds. It will be understood that these additives are added in an amount of less than 5 wt.%, based on the total weight of the composition and they do not play a role in the unipolar electrostatic charge that is imparted with the aerosol composition discharges from an aerosol spray device.
  • compositions shown in Table 1 were determined using the Knockdown test for hidden insects. Comparative spraying formulation were also tested:
  • Comparative A commercial product Raid Australia, comprising 0.405 wt.% tetramethrin, 0.09 wt.% d-phenothrin, and 0.09 wt.% allethrin.
  • Comparative B commercial product Raid Multi Insectos Base Aqua, comprising 0.102wt.% prallethrin and 0.125 wt.% d-phenothrin.
  • compositions of Table 1 were sprayed from an aerosol spray device as described in WO 99/01227.
  • the aerosol device for spraying composition 1 had a vapour phase tap with a diameter of 0.7 mm.
  • the aerosol device for spraying composition 2 had a vapour phase tap with a diameter of 1.02mm.
  • spraying heads with an acetal insert in the actuator were used which had a bore with a diameter of 1 .65 mm.
  • the L/a ratio of both aerosol devices is higher than 10.
  • Table 2 shows the %KD determined using the Knock-down test for hidden insects. The values reported on this table correspond to the average of three experiments; in other words, each composition was tested three times. Table 2. % KD for compositions according to the invention and comparative compositions.

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  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Pest Control & Pesticides (AREA)
  • Plant Pathology (AREA)
  • Wood Science & Technology (AREA)
  • Zoology (AREA)
  • Environmental Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Insects & Arthropods (AREA)
  • Agronomy & Crop Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Toxicology (AREA)
  • Dentistry (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Catching Or Destruction (AREA)

Abstract

La présente invention concerne une utilisation d'une composition d'aérosol pour tuer, anéantir et/ou repousser des insectes volants cachés, la composition étant une composition électriquement neutre sous la forme d'une émulsion eau-dans-huile ou d'une émulsion huile-dans-eau, dans laquelle les gouttelettes de l'émulsion, lors de la décharge d'un dispositif de pulvérisation d'aérosol, reçoivent une charge électrostatique unipolaire. L'invention concerne également un procédé consistant à tuer, repousser et/ou réduire la quantité d'insectes dans l'air, les insectes étant des insectes volants cachés; le procédé comprenant la pulvérisation dans l'air d'une composition d'aérosol, la composition étant pulvérisée à partir d'un dispositif de pulvérisation d'aérosol qui est actionné mécaniquement sous pression.
PCT/EP2022/078904 2021-10-18 2022-10-18 Utilisation d'une composition d'aérosol et procédé de lutte contre les insectes volants cachés Ceased WO2023066897A1 (fr)

Priority Applications (1)

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AU2022373901A AU2022373901A1 (en) 2021-10-18 2022-10-18 Use of an aerosol composition and method to control hidden flying insects

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Application Number Priority Date Filing Date Title
IN202141047104 2021-10-18
IN202141047104 2021-10-18
EP21215093.2 2021-12-16
EP21215093.2A EP4165988A1 (fr) 2021-10-18 2021-12-16 Utilisation d'une composition d'aérosol et procédé de lutte contre les insectes volants cachés

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1445813A (en) 1973-01-08 1976-08-11 Cpc International Inc Stabilization of pyrethroids
WO1999001227A1 (fr) 1997-07-04 1999-01-14 University Of Southampton Insecticides pouvant ameliorer le ciblage d'insectes volants et appareil de chargement de liquides
WO2001018145A2 (fr) 1999-09-07 2001-03-15 Reckitt Benckiser (Uk) Limited Compositions electrostatiques d'aerosol

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1445813A (en) 1973-01-08 1976-08-11 Cpc International Inc Stabilization of pyrethroids
WO1999001227A1 (fr) 1997-07-04 1999-01-14 University Of Southampton Insecticides pouvant ameliorer le ciblage d'insectes volants et appareil de chargement de liquides
WO2001018145A2 (fr) 1999-09-07 2001-03-15 Reckitt Benckiser (Uk) Limited Compositions electrostatiques d'aerosol

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