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WO2018134079A1 - Diffuseur passif destiné à la lutte contre les insectes volants - Google Patents

Diffuseur passif destiné à la lutte contre les insectes volants Download PDF

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Publication number
WO2018134079A1
WO2018134079A1 PCT/EP2018/050420 EP2018050420W WO2018134079A1 WO 2018134079 A1 WO2018134079 A1 WO 2018134079A1 EP 2018050420 W EP2018050420 W EP 2018050420W WO 2018134079 A1 WO2018134079 A1 WO 2018134079A1
Authority
WO
WIPO (PCT)
Prior art keywords
emanator
based substrate
cellulosic based
active pyrethroid
vapor active
Prior art date
Application number
PCT/EP2018/050420
Other languages
English (en)
Inventor
Carla Baratta
Christopher LOXLEY
Adele Maraboli
Paolo Mondani
Julia Sarah Rogers
Original Assignee
Unilever N.V.
Unilever Plc
Conopco, Inc., D/B/A Unilever
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
Application filed by Unilever N.V., Unilever Plc, Conopco, Inc., D/B/A Unilever filed Critical Unilever N.V.
Publication of WO2018134079A1 publication Critical patent/WO2018134079A1/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01M—CATCHING, TRAPPING OR SCARING OF ANIMALS; APPARATUS FOR THE DESTRUCTION OF NOXIOUS ANIMALS OR NOXIOUS PLANTS
    • A01M1/00—Stationary means for catching or killing insects
    • A01M1/20—Poisoning, narcotising, or burning insects
    • A01M1/2022—Poisoning or narcotising insects by vaporising an insecticide
    • A01M1/2027—Poisoning or narcotising insects by vaporising an insecticide without heating
    • A01M1/2055—Holders or dispensers for solid, gelified or impregnated insecticide, e.g. volatile blocks or impregnated pads

Definitions

  • the present invention relates to insect control, more particularly to a passive emanator for controlling flying insects, the emanator comprising a cellulosic based substrate and a vapor active pyrethroid.
  • Flying insects such as mosquitoes are generally perceived as unwanted house guests as they are a nuisance e.g. by disturbing people while they sleep or try to sleep.
  • Mosquito bites usually result in itching bumps and the bite area can become infected when uncontrolled scratching causes further damage to affected area.
  • a more serious concern is the risk of transmittance by mosquitoes of diseases like malaria, dengue, zika, yellow fever and encephalitis.
  • Mosquito nets offer protection against mosquitoes and other insects but can only do so for the space enclosed by the net like for example a net covering a bed.
  • netting is used to cover openings like windows and doors but will only be effective if strict discipline is observed in keeping them closed.
  • Another means of controlling flying insects is the use of articles or devices that dispense insecticide vapors into the atmosphere.
  • Such articles or devices generally burn or heat a liquid or solid substrate to vaporize the active ingredient. Examples include impregnated coils that are burned like e.g. insecticide coils or citronella oil comprising candles. The heating requirement may be perceived as inconvenient or even undesirable because of the fire risk or generation of smoke. Furthermore, these measures are of limited duration and ends when the coil or candle is burned up.
  • emanators have good storability, i.e. the time the emanator can be stored without significant loss of efficacy.
  • EP 0792 581 A1 discloses an insect controller comprising a volatile insecticidal or insect repellent compound used without heating which is carried on a support with at least one through hole.
  • the support can be made of paper, cloths or resin films.
  • WO 00/074490 discloses an insect control article comprising a non-absorbing substrate composed of a barrier material selected from polymeric film, aluminium and glass.
  • WO 2005/046332 discloses a cellulosic based substrate or matrix for controlling flying insects wherein the substrate or matrix is impregnated with an insecticidally effective amount of a vapor active pyrethroid in a specific carrier solvent or combination of carrier solvents.
  • the emanator has a specific spatial configuration as this provides for good release kinetics of the pyrethroid without any active (e.g. heating and/or use of power) means of distribution (e.g. a powered fan to create an airflow).
  • the present invention provides a passive emanator for controlling flying insects, the emanator comprising:
  • cellulosic based substrate wherein the cellulosic based substrate:
  • cellulosic based substrate is impregnated with an insecticidally effective amount of the vapor active pyrethroid in a carrier solvent system.
  • the invention also provides an emanator according to the present invention wherein the emanator is packaged and comprises packaging material enclosing the emanator into which material the vapor active pyrethroid does not migrate and/or is not absorbed.
  • the invention further provides a method of manufacturing a packaged emanator according to the present invention comprising the step of impregnating the cellulosic based substrate with the vapor active pyrethroid in a carrier solvent system followed by allowing at least part of the solvent to evaporate before packaging the emanator.
  • Fig. 1 a and 2a show an emanator in the closed configuration (2D) showing the cut pattern.
  • Fig. 1 b & 1 c and 2b & 2c show the emanator in the open configuration (3D) with the 3 dimensional shape resulting from the applied cut pattern.
  • the emanator of the present invention is a passive emanator meaning the vapor active pyrethroid is vaporized without heating or use of power. So, the emanator does not require artificially augmented air movement, e.g. by means of an electric fan, or heating, e.g. heating of the emanator by electrical means, for controlling flying insects like e.g. mosquitoes.
  • Controlling flying insects is defined as at least repelling and preferably incapacitating and/or killing flying insects.
  • the insects are mosquitoes.
  • the emanator of the present invention comprises a cellulosic based substrate that has a specific grammage and caliper and comprises cellulose fibers of a certain length. It has been found that such a substrate provides good evaporation characteristics of the vapor active pyrethroid and/or longevity of efficacy. It was found that not all cellulosic based substrates provide the same evaporation characteristics.
  • Grammage is a well-known term in the paper industry and is defined as the paper density expressed in grams per square meter (gsm). Typical office paper for example has a grammage of about 80 gsm.
  • the cellulosic based substrate used in the present emanator has a grammage of 200 to 400 grams per square meter (gsm). Preferably the grammage is 250 to 350 gsm and more preferably is 280 to 310 gsm.
  • Caliper refers to the thickness of the cellulosic based substrate and as such is a well- known term in the paper industry referring to paper thickness.
  • the caliper of the substrate is 50 to 2000 micrometers. Preferably the caliper is 100 to 1500 micrometer and more preferably 200 to 1000 micrometer. An especially preferred caliper is 300 to 700 micrometers.
  • the cellulosic based substrate comprises cellulose fibers having a weighted average fiber length of 0.5 to 10 mm.
  • the weighted average fiber length is determined using the method described in TAPPI T271 as published by the Technical Association of the Pulp and Paper Industry (TAPPI).
  • the fiber length is 0.5 to 7 mm, more preferably 1 to 5 mm and even more preferably 1 to 4 mm, like for example about 2 mm.
  • the cellulosic based substrate Preferably at least 50% of the fibers in the cellulosic based substrate have the aforementioned fiber length, more preferably at least 80% and preferably the cellulosic based substrate essentially consists of cellulose fibers having the aforementioned fiber length.
  • An especially preferred cellulosic based substrate for use in the present passive emanator has a grammage of 270 to 310 gsm and a caliper of 300 to 600 micrometers and comprises cellulose fibers having a weighted average fiber length of 1 to 4 mm.
  • the cellulosic based substrate can be any suitable material that comprises cellulosic fibers complying with grammage, caliper and fiber length requirements.
  • the cellulosic based substrate is paper, more preferably bleached paper.
  • the passive emanator of the present invention comprises a vapor active pyrethroid.
  • Pyrethroids are insecticides that as such are known in the art. It will be appreciated that vapor active pyrethroids are those that are volatile at ambient temperature without heat or combustion. Preferably the vapor active pyrethroid is selected from metofluthrin, transfluthrin, empenthrin, methothrin, tefluthrin, fenfluthrin and mixtures thereof. Preferably the pyrethroid is metofluthrin and/or transfluthrin.
  • the emanator is impregnated with an insecticidally effective amount of the vapor active pyrethroid.
  • the total amount of vapor active pyrethroid comprised in the emanator is 10 to 2000 mg, more preferably 20 to 1500 mg, even more preferably 30 to 1000 mg, still even more preferably 40 to 500 mg and even still more preferably 50 to 250 mg.
  • the cellulosic based substrate of the emanator is impregnated with a vapor active pyrethroid in an amount of 20 to 400,000 mg/m 2 , preferably 50 to 150,000 mg/m 2 , more preferably 100 to 50,000 mg/m 2 and even more preferably 500 to 6,250 mg/m 2 .
  • the vapor active pyrethroid is emanated into the environment at a rate of at at least 0.040 mg/h, more preferably at least 0.075 mg/h, even more preferably at least 0.1 mg/h and still more preferably at least 0.2 mg/h for at least 1 week, more preferably at least 2 weeks, even more preferably at least 3 weeks and even more preferably at least 4 weeks after first use and at a temperature in the range of 18 to 40 °C.
  • the emanation rate is at a temperature in the range of 20 to 35 °C.
  • the emanator is impregnated with an insecticidally effective amount of the vapor active pyrethroid in a carrier solvent system meaning that the effective amount of pyrethroid is dissolved in a carrier solvent and the cellulosic based substrate is sub-sequentially impregnated with the resulting mixture.
  • "Impregnated/impregnating” is defined as applying the resulting mixture to the cellulosic based substrate, e.g. by spraying, such that the vapor active pyrethroid is distributed, preferably evenly, throughout the cellulosic based substrate.
  • the carrier solvent system is selected from one or combination of solvents having an evaporation rate according to ASTM D3539-87 of less than 1.0 and a Snyder polarity index of 0.0 to 4.0.
  • the carrier solvent system is selected from one or a combination of dipropylene glycol dimethyl ether, propylene carbonate, ethanol, isopropyl alcohol, acetone, 2-butanone, ethyl acetate, cyclohexane, hexane and heptane.
  • Dipropylene glycol dimethyl ether and propylene carbonate are especially preferred.
  • Dipropylene glycol dimethyl ether can be obtained as ProglydeTM from the Dow Chemical Company. Spatial configuration
  • the shape of the cellulosic based substrate forming the emanator is such that it forms an essentially continuous sheet when it is in a 2 dimensional shape (Fig. 1 a and 2a), the sheet comprising one or more cuts such that when it is in a 3 dimensional shape the plane of the substrate is essentially perpendicular to a rising or falling air flow such that it allows the emanator to spin around its axis, the axis being in the direction of the airflow (Fig. 1 b, 1 c, 2b, 2c).
  • the emanator can be in a collapsed state (i.e. 'closed configuration') resulting is an essentially continuous flat sheet that when expanded by pulling it open (i.e. 'open configuration') opens up into a 3 dimensional shape.
  • the closed configuration can be used to store and/or distribute the emanator requiring less space and effectively evaporating less vapor active pyrethroid.
  • the open configuration is used as this allows a rising or falling air flow to make the emanator spin around its axis.
  • the emanator can suitably be constructed from two sheets of cellulosic based substrate like for example paper attached to one another at one or more continuous or discreet areas using for example adhesive and/or mechanical means like staples, see Fig. 1 a and 2a.
  • One or more cuts are then applied that allow the two sheets to be pulled open and form a 3 dimensional shape with the plane of the substrate being essentially perpendicular to a rising or falling air flow such that it allows the emanator to spin around its axis, the axis being in the direction of the airflow, see Fig. 1 b, 1 c, 2b and 2c.
  • Total surface area is defined as the total geometric or two-dimensional surface area of the cellulosic based substrate being exposed to the surrounding air when in the 3 dimensional shape.
  • a 10x10 cm flat sheet of paper has a total surface area of 200 cm 2 . It will be appreciated that the total surface area of an emanator constructed from two sheets of paper each measuring 10x10 cm and the two sheets being attached to one another at 10 cm 2 has to be calculated as follows: (2x2x10x10) minus (2x10).
  • the cellulosic based substrate has a total surface area of 50 to 5000 cm 2 , more preferably 100 to 4000 cm 2 , even more preferably 200 to 3000 cm 2 , still even more preferably 300 to 2000 cm 2 and even still more preferably 400 to 1000 cm 2 .
  • the invention also provides for an emanator according to the invention wherein the emanator is packaged and comprises packaging material enclosing the emanator into which material the vapor active pyrethroid does not migrate and/or is not absorbed.
  • the packaging material prevents the vapor active pyrethroid to evaporate into the environment and allows for storage and/or distribution without the emanator losing its efficacy. It is preferred that the emanator is in its collapsed state (i.e. 'closed configuration') when it is comprised in the packaging material.
  • the packaging material can be any suitable material into which material the vapor active pyrethroid does not migrate and/or is not absorbed, like for example plastic, metal foil or laminates although the latter is less preferred because of difficulty with recycling.
  • the invention further provides a method of manufacturing the packaged emanator according to the present invention comprising the step of impregnating the cellulosic based substrate with the vapor active pyrethroid in a carrier solvent system followed by allowing at least part of the solvent to evaporate before packaging the emanator.
  • the emanator is impregnated with an insecticidally effective amount of the vapor active pyrethroid in a carrier solvent system meaning that the effective amount of pyrethroid is dissolved in a carrier solvent and the cellulosic based substrate is sub-sequentially impregnated with the resulting mixture.
  • the amount of vapor active pyrethroid and carrier solvent system used can vary and e.g. may take into account the desired amount of vapor active pyrethroid to be present in the emanator and/or the total surface area of the emanator that needs to be sprayed with the mixture of vapor active pyrethroid and carrier solvent system.
  • the weight ratio of vapor active pyrethroid to carrier solvent system is 0.01 to 0.9, preferably 0.02 to 0.5 and more preferably 0.04 to 0.4.
  • a mixture of 70 mg of transfluthrin and 1600 mg of dipropylene glycol dimethyl ether will have a weight ratio of vapor active pyrethroid to carrier solvent system of 0.044 (i.e. 70/1600).
  • the passive emanator used in the examples below is based on paper having a flat structure according to Fig. 1 a that could be pulled open using the central 'butterfly' to give a spherical shaped lantern structure according to Fig. 1 b and 1 c.
  • the paper used had a grammage of about 290 gsm, caliper of 438 micrometer and fiber length of about 2 mm.
  • the exposed surface area includes both sides of both halves of the lantern with the exception of the glued outer rim where only one side of each half are exposed to air.
  • the surface area of the cellulosic structure in Fig. 1 is as follows:
  • the total surface area of one side is 168 cm 2 .
  • the area of the central circular cut region is 95 cm 2 , so for 4 sides this results in 380 cm 2 of exposed surface for evaporation.
  • TFT transfluthrin

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Pest Control & Pesticides (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Engineering & Computer Science (AREA)
  • Insects & Arthropods (AREA)
  • Wood Science & Technology (AREA)
  • Zoology (AREA)
  • Environmental Sciences (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)

Abstract

L'invention concerne un diffuseur passif destiné à la lutte contre les insectes volants, le diffuseur comprenant : a. un substrat à base de cellulose ; et b. un pyréthroïde actif en phase vapeur. Le substrat à base de cellulose présente un grammage de 200 à 400 gsm, a une épaisseur de 50 à 2 000 micromètres, et comprend des fibres de cellulose ayant une longueur de fibre moyenne pondérée de 0,5 à 10 mm. Ledit substrat à base de cellulose est imprégné d'une quantité efficace du point de vue insecticide du pyréthroïde actif en phase vapeur dans un système de solvant véhicule.
PCT/EP2018/050420 2017-01-23 2018-01-09 Diffuseur passif destiné à la lutte contre les insectes volants WO2018134079A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP17152576 2017-01-23
EP17152576.9 2017-01-23

Publications (1)

Publication Number Publication Date
WO2018134079A1 true WO2018134079A1 (fr) 2018-07-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2018/050420 WO2018134079A1 (fr) 2017-01-23 2018-01-09 Diffuseur passif destiné à la lutte contre les insectes volants

Country Status (1)

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WO (1) WO2018134079A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021113659A1 (fr) * 2019-12-06 2021-06-10 S. C. Johnson & Son, Inc. Distributeur et son procédé d'utilisation

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0792581A1 (fr) 1996-02-29 1997-09-03 Sumitomo Chemical Company, Limited Dispositif de lutte contre les insectes
WO2000074490A1 (fr) 1999-06-04 2000-12-14 S. C. Johnson & Son, Inc. Bande insectifuge passive
WO2005046332A1 (fr) 2003-11-07 2005-05-26 Reckitt Benckiser (Australia) Pty Limited Produit et procede de lutte contre les insectes volants
WO2005053390A1 (fr) * 2003-11-07 2005-06-16 Reckitt Benckiser (Australia) Pty Limited Moyen de conditionnement permettant la diffusion de pyrethroide pour eliminer efficacement les insectes volants
WO2006134353A1 (fr) * 2005-06-16 2006-12-21 Reckitt Benckiser (Australia) Pty Limited Produit et procédé pour émaner des substances actives sous forme de vapeur
CN106231898A (zh) * 2014-03-31 2016-12-14 S.C.约翰逊父子公司 挥发性材料分配器

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0792581A1 (fr) 1996-02-29 1997-09-03 Sumitomo Chemical Company, Limited Dispositif de lutte contre les insectes
WO2000074490A1 (fr) 1999-06-04 2000-12-14 S. C. Johnson & Son, Inc. Bande insectifuge passive
WO2005046332A1 (fr) 2003-11-07 2005-05-26 Reckitt Benckiser (Australia) Pty Limited Produit et procede de lutte contre les insectes volants
WO2005053390A1 (fr) * 2003-11-07 2005-06-16 Reckitt Benckiser (Australia) Pty Limited Moyen de conditionnement permettant la diffusion de pyrethroide pour eliminer efficacement les insectes volants
WO2006134353A1 (fr) * 2005-06-16 2006-12-21 Reckitt Benckiser (Australia) Pty Limited Produit et procédé pour émaner des substances actives sous forme de vapeur
CN106231898A (zh) * 2014-03-31 2016-12-14 S.C.约翰逊父子公司 挥发性材料分配器

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021113659A1 (fr) * 2019-12-06 2021-06-10 S. C. Johnson & Son, Inc. Distributeur et son procédé d'utilisation
CN115038331A (zh) * 2019-12-06 2022-09-09 S.C.约翰逊父子公司 散发器及其使用方法
CN115038331B (zh) * 2019-12-06 2024-03-19 S.C.约翰逊父子公司 散发器及其使用方法
US11944096B2 (en) 2019-12-06 2024-04-02 S.C. Johnson & Son, Inc. Dispenser and method of use thereof

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