WO2004068945A1 - Substrate for volatile delivery systems - Google Patents

Substrate for volatile delivery systems Download PDF

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Publication number
WO2004068945A1
WO2004068945A1 PCT/US2004/002591 US2004002591W WO2004068945A1 WO 2004068945 A1 WO2004068945 A1 WO 2004068945A1 US 2004002591 W US2004002591 W US 2004002591W WO 2004068945 A1 WO2004068945 A1 WO 2004068945A1
Authority
WO
WIPO (PCT)
Prior art keywords
volatile material
substrate
volatile
pores
dispensing device
Prior art date
Application number
PCT/US2004/002591
Other languages
French (fr)
Inventor
Brian T. Davis
Robert R. Emmrich
Michael J. Aulozzi
Padma P. Varanasi
Michael C. Fryan
Kenneth J. Welch
Stanley J. Flashinski
Debra A. Strasser
Original Assignee
S. C. Johnson & Son Inc.
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 S. C. Johnson & Son Inc. filed Critical S. C. Johnson & Son Inc.
Priority to MXPA05008195A priority Critical patent/MXPA05008195A/en
Priority to CA 2513404 priority patent/CA2513404C/en
Priority to BRPI0407063 priority patent/BRPI0407063A/en
Priority to JP2006503167A priority patent/JP5068995B2/en
Priority to CN200480005640.6A priority patent/CN1756479B/en
Priority to DE200460010614 priority patent/DE602004010614T2/en
Priority to AU2004209908A priority patent/AU2004209908B2/en
Priority to EP04706956A priority patent/EP1583418B1/en
Publication of WO2004068945A1 publication Critical patent/WO2004068945A1/en

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Classifications

    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01MCATCHING, TRAPPING OR SCARING OF ANIMALS; APPARATUS FOR THE DESTRUCTION OF NOXIOUS ANIMALS OR NOXIOUS PLANTS
    • A01M1/00Stationary means for catching or killing insects
    • A01M1/20Poisoning, narcotising, or burning insects
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61LMETHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L9/00Disinfection, sterilisation or deodorisation of air
    • A61L9/015Disinfection, sterilisation or deodorisation of air using gaseous or vaporous substances, e.g. ozone
    • A61L9/04Disinfection, sterilisation or deodorisation of air using gaseous or vaporous substances, e.g. ozone using substances evaporated in the air without heating
    • A61L9/12Apparatus, e.g. holders, therefor
    • A61L9/127Apparatus, e.g. holders, therefor comprising a wick
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01MCATCHING, TRAPPING OR SCARING OF ANIMALS; APPARATUS FOR THE DESTRUCTION OF NOXIOUS ANIMALS OR NOXIOUS PLANTS
    • A01M1/00Stationary means for catching or killing insects
    • A01M1/20Poisoning, narcotising, or burning insects
    • A01M1/2022Poisoning or narcotising insects by vaporising an insecticide
    • A01M1/2061Poisoning or narcotising insects by vaporising an insecticide using a heat source
    • A01M1/2077Poisoning or narcotising insects by vaporising an insecticide using a heat source using an electrical resistance as heat source
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01MCATCHING, TRAPPING OR SCARING OF ANIMALS; APPARATUS FOR THE DESTRUCTION OF NOXIOUS ANIMALS OR NOXIOUS PLANTS
    • A01M1/00Stationary means for catching or killing insects
    • A01M1/20Poisoning, narcotising, or burning insects
    • A01M1/2022Poisoning or narcotising insects by vaporising an insecticide
    • A01M1/2061Poisoning or narcotising insects by vaporising an insecticide using a heat source
    • A01M1/2088Poisoning or narcotising insects by vaporising an insecticide using a heat source using a burner or a flame as heat source
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01NPRESERVATION 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
    • A01N25/00Biocides, 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
    • A01N25/12Powders or granules
    • A01N25/14Powders or granules wettable
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01NPRESERVATION 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
    • A01N25/00Biocides, 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
    • A01N25/34Shaped forms, e.g. sheets, not provided for in any other sub-group of this main group
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01NPRESERVATION 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
    • A01N53/00Biocides, pest repellants or attractants, or plant growth regulators containing cyclopropane carboxylic acids or derivatives thereof
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61LMETHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L9/00Disinfection, sterilisation or deodorisation of air
    • A61L9/015Disinfection, sterilisation or deodorisation of air using gaseous or vaporous substances, e.g. ozone
    • A61L9/02Disinfection, sterilisation or deodorisation of air using gaseous or vaporous substances, e.g. ozone using substances evaporated in the air by heating or combustion
    • A61L9/03Apparatus therefor
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61LMETHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L9/00Disinfection, sterilisation or deodorisation of air
    • A61L9/015Disinfection, sterilisation or deodorisation of air using gaseous or vaporous substances, e.g. ozone
    • A61L9/02Disinfection, sterilisation or deodorisation of air using gaseous or vaporous substances, e.g. ozone using substances evaporated in the air by heating or combustion
    • A61L9/03Apparatus therefor
    • A61L9/037Apparatus therefor comprising a wick
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61LMETHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L9/00Disinfection, sterilisation or deodorisation of air
    • A61L9/015Disinfection, sterilisation or deodorisation of air using gaseous or vaporous substances, e.g. ozone
    • A61L9/04Disinfection, sterilisation or deodorisation of air using gaseous or vaporous substances, e.g. ozone using substances evaporated in the air without heating
    • A61L9/12Apparatus, e.g. holders, therefor
    • A61L9/122Apparatus, e.g. holders, therefor comprising a fan
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S424/00Drug, bio-affecting and body treating compositions
    • Y10S424/10Insect repellent
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/249921Web or sheet containing structurally defined element or component
    • Y10T428/249953Composite having voids in a component [e.g., porous, cellular, etc.]

Definitions

  • This invention relates to volatile dispensing devices that employ active means to dispense volatiles from a volatile-impregnated substrate. More particularly, the invention relates to improved volatile impregnated substrates, such as wicks and mats, that can be used in a volatile dispensing device that employs active means to dispense.
  • an "effective amount” or an “effective delivery rate” and the like term is defined to mean that amount or rate sufficient to achieve the intended effect.
  • Active means is defined as heat, moving air, or other means of imparting energy to a volatile material to be dispensed, and a volatile dispensing device that employs active means to dispense volatiles will be referred to as “actively dispensing" the volatile material.
  • actively dispensing the volatile material.
  • insect control volatile active ingredients have to be delivered at no less than an "insect controlling rate,” defined herein as that rate sufficient to repel or otherwise control target insects within the space to be protected.
  • volatilizable materials may be air scents (e.g. fragrances), pest control materials (e.g., insecticides), allergen control ingredients, disinfectants, and the like.
  • a heat source is used to promote the wicking action and release of a volatile material from a wick, one end of which is immersed in a volatile liquid contained in a reservoir.
  • One version of this type of device is plugged into an electrical wall outlet to supply power to a heating coil within a housing. The generated heat raises the temperature of a material contained in the wick and volatilizes the material. Convection air currents dispense the volatilized material into the room. Examples of this type of device and related devices can be found in U.S. Patent Nos. 6,361,752; 5,647,053; 5,290,546; 5,222,186; 5,095,647; 5,038,394; and 4,663,315.
  • a stiff, porous mat (commonly made of a pressed, cellulosic, fibrous material) is impregnated with a volatile material, or a volatile material is placed in a pan-like metal structure. These mats and pans are then placed on heaters to cause the volatile material to vaporize into the atmosphere.
  • heaters One type of heater used for this pu ⁇ ose is sold by S. C. Johnson & Son, Inc. under the trademark "FUYI VAPE". Examples of this type of device and related devices can be found in U.S. Patent Nos. 6,446,384; 6,309,986; 6,031,967; 5,945,094; and 4,391,781.
  • a stiff, porous mat is impregnated with a volatile material, and the mat is held within the device such that a flow of hot gases from a fuel burner passes over the mat and causes the volatile material to vaporize into the atmosphere.
  • An example of this type of device can be found in PCT International Patent Publication No. WO 00/78135.
  • moving air is directed against a substrate or through a reticulated or otherwise airflow-transmitting substrate to thereby volatilize volatile material with the substrate has been impregnated. Examples of this type of device can be found in U.S. Patent No. 5,547,616 and in PCT International Patent Publication No. WO 01/02025. [0010] While all of these devices provide satisfactory results under certain circumstances, there are drawbacks to each type of device.
  • wicking materials limit the performance of the wick of the device. For instance, when using porous wicks made of felt or fabric in such a device, there is a tendency as the wick is heated for the solvents to quickly volatilize off, thereby leaving high boiling point materials behind in the wick. The high boiling point materials remaining in the wick can cause clogging of the wick.
  • Other wick materials include ceramics and compressed sawdust.
  • wicks experience the same sort of clogging when used in a device that uses a heat source to promote the release of a volatile material from a wick immersed in a volatile liquid. As a result, it is difficult to maintain stable evaporation of the volatile liquid for extended time periods. While uniform release of volatiles has been reported in U.S. Patent Nos. 4,286,754 for non-heated wicks, the problem of non-linear release in heated wicks remains. [0012] Certain volatile materials, such as some insecticide formulations, include materials that either are or become non- volatile when the liquid is heated in a wick.
  • pyrethrum insecticides typically include or form non- volatile waxes or polymers. During use in a dispenser having a conventional ceramic or sawdust wick, these waxes form sludges that can clog the wick. Thus, ceramic and sawdust wick systems do not allow effective utilization of insecticidal formulas that contain natural pyrethrins and te ⁇ enes.
  • Dispensing devices using heated mats also have problems with respect to the mats being exposed to differing temperatures across a heater surface.
  • Existing heaters often have hotter regions at certain points along their heater surface, typically generally along a center line.
  • the mats therefore can have uneven and incomplete vaporization. Uneven mat heating can cause the overall rate at which insect control volatile active ingredients are delivered to drop below the insect controlling rate for the active while considerable quantities of the active remain in poorly heated portions of the mat. Indeed, even aside from the issue of uneven heating, mats tend not to deliver a linear release of volatile materials.
  • the initial volatile delivery rate is comparatively high, as active accessibly near the surface of the mat quickly volatilizes.
  • a substrate made according to the invention for use in a volatile dispensing device that actively dispenses volatile material from the substrate.
  • the substrate includes granular particles adhered together to form a body having a network of pores and passages, the interior surfaces of which are non-reactive and non-abso ⁇ tive with respect to the volatile material to be dispensed.
  • granular particles is defined as meaning discrete, monolithic, compact particles (as distinct from linearly extended particles such as fiber strands or substantially continuous, porous materials such as ceramics) that, when packed in a confined space, have points of contact with neighboring particles but also leave open spaces between the particles.
  • Sand particles are an example of such granular particles and are preferred both for their low cost, ability to withstand heat, and non-reactivity.
  • glass, high density polymeric particles, and other particles are also possible.
  • Preferred high density polymers are high density polycarbonate and polyethylene polymers. If the granular particles are non- organic, they can be adhered by any convenient means, including but not limited to point fusing by application of heat and/or pressure and/or the use of a polymerizing or other binder, coating, or the like that simply sticks the particles together, the latter means being preferred generally.
  • the substrate of the invention is limited to particles adhered only by the use of a polymerizing or other binder, coating, or the like, without the use of any sintering step.
  • "Point fusing" is defined as fusing only at points of contact between neighboring particles without a substantial change in the size and shape of the particles or the size and shape of the network of passages and pores left between the particles.
  • the volatile material may comprise an insect control active ingredient initially deliverable by the dispenser at an insect controlling rate, and preferably no more than 10% residual volatile material remains in the pores when the dispenser has so depleted the volatile material as to no longer be able to deliver the volatile material at the insect controlling rate.
  • the volatile material is preferably selected from natural pyrethrins, pyrethrum extract, synthetic pyrethroids, and mixtures thereof.
  • the volatile material can be a fragrance or other volatile air treatment material.
  • the binder is selected from cross-linked polymeric materials and mixtures thereof.
  • the granular particles are sand particles (and, even more preferred, sand particles that include silica sand), and the binder is a cured phenolic resin such as novolac resin, which is commercially available from many sources.
  • a volatile material is disposed in the pores, thereby impregnating the substrate, preferably before the substrate is installed in the dispensing device but also, optionally, after the substrate is located in or forms a permanent part of a device.
  • the volatile dispensing device has a slot through which the substrate can be inserted to load the substrate into the volatile dispensing device, and the substrate is formed into a shape suitable for being suspended in the slot.
  • the substrate of the invention is positioned in the dispensing device so as to be subjected to the active means for dispensing volatile materials.
  • the substrate is positioned on or near the heat source of the dispensing device. In such a device, the heat source is activated, thereby elevating the temperature of the substrate such that volatile material is released from the pores.
  • the substrate is so placed as to be exposed to the air flow.
  • the pores occupy at least 25% percent by volume of the substrate. It is also preferred that the pores have an average size in the range of 20 to 200 microns.
  • the volatile material is released from the pores at a substantially linear rate until release at an effective rate is no longer achieved.
  • the volatile material is an insect control active such as transfluthrin
  • the volatile material is released substantially linearly at an insect controlling rate until an end point is reached, after which very little volatile material remains.
  • as little as 10% residual volatile material remains in the pores after effective release of the volatile material from the substrate ceases, as evaluated and quantified by conventional gas chromatography and mass spectrometric methods.
  • no more than 5% residual volatile material remains in the pores after effective release of the volatile material from the substrate ceases, as evaluated and quantified by conventional gas chromatography and mass spectrometric methods.
  • a substrate according to the invention When using a substrate according to the invention, many active ingredients can be used directly to impregnate the substrate, without having to dilute the active ingredients with a solvent.
  • an insect control mat of conventional size (approximately 3.5 by 2 cm.) can be dosed with transfluthrin by depositing the desired amount of that active in liquid form and free of solvents, directly on the mat surface, whereupon it sinks promptly into the mat surface.
  • transfluthrin similarly deposited on a conventional, cellulosic mat sinks into the mat so slowly as to be impractical for mass production of dosed mats. Consequently, for conventional mats, the transfluthrin must be dissolved in a solvent to aid liquid migration before such mats can be dosed.
  • the method of the invention for delivering a volatile material from a dispensing device that uses a heat source to promote release of volatile materials from a wick designed to deliver a volatile liquid from a reservoir to a heated location within a heater wherein the volatile liquid can be heated and volatilized includes the following steps. First, one provides, as a replacement for a conventional wick or, alternatively, for both a conventional wick and reservoir, a substrate having granular particles adhered together to form a body. The body has a network of pores and passages, the interior surfaces of which are non-reactive and non-abso ⁇ tive with respect to the volatile material to be dispensed, the body being so formed as to occupy the heated location within the heater.
  • a volatile material is disposed in the pores.
  • the substrate is placed within the dispensing device in the space normally occupied by a wick. Then the volatile dispensing device is activated to release the volatile material from the pores, which volatile material is then dispensed.
  • a method for dispensing a volatile material from a heating device having (a) an enclosed heating chamber designed to hold the a volatile-impregnated substrate therewithin, the heating chamber having chamber walls and being vented to the outside air; (b) a fuel burner; and (c) an air flow path to guide hot gases generated by the fuel burner past the substrate to heat the substrate and release the volatile material therefrom.
  • the method includes the steps of first providing a substrate holdable by the enclosed heating chamber, the substrate having granular particles adhered together to form a body having a network of pores and passages, the interior surfaces of which are non-reactive and non-abso ⁇ tive with respect to the volatile material to be dispensed, the substrate also having the volatile material to be dispensed, disposed in the pores.
  • the substrate is then installed in the heating chamber, and the fuel burner is activated to release the volatile material from the pores, which volatile material is then dispensed.
  • the volatile material is a substance that is non-liquid at a temperature of 30°C or below, such as transfluthrin.
  • a method for dispensing a volatile material from a dispensing device that uses a heat source to promote release of volatile materials from a substrate by application of heat from a heating surface.
  • the method includes the steps of first providing a substrate of a size and shape selected to fit onto the heating surface, the substrate having granular particles adhered together to form a body having a network of pores and passages, the interior surfaces of which are non- reactive and non-abso ⁇ tive with respect to the volatile material to be dispensed.
  • the substrate also has the volatile material to be dispensed, disposed in the pores.
  • the substrate is installed on the heating surface, and the dispensing device is activated to cause the heating surface to heat to release the volatile material from the pores, which volatile material is then dispensed.
  • the volatile material is a substance that is non-liquid at a temperature of 30°C or below, such as transfluthrin.
  • a method for delivering a volatile material from a dispensing device that uses a heat source to promote release of volatile materials from a wick designed to deliver a volatile liquid from a reservoir to a heated location within a heater wherein the volatile liquid can be heated and volatilized.
  • an insect control active ingredient selected from the group consisting of natural pyrethrins, pyrethrum extract, synthetic pyrethroids, and mixtures thereof.
  • one provides, as a wick, a substrate comprising granular particles adhered together to form a body having a network of pores and passages.
  • the interior surfaces of the substrate are non-reactive and non-abso ⁇ tive with respect to the volatile material to be dispensed.
  • the body is formed to occupy the heated location within the heater, and activation of the heat source of the volatile dispensing device releases the volatile material from the pores to dispense the volatile material.
  • the construction of the substrate serves to limit clogging of the pores by the pyrethrum insecticides and/or associated waxes.
  • a method for delivering a volatile material from a dispensing device that uses a moving air stream to promote release of volatile materials from a substrate held within the air stream includes the following steps.
  • a substrate is provided of a size and shape selected to be held in the air stream, the substrate having granular particles adhered together to form a body having a network of pores and passages, the interior surfaces of which are non-reactive and non-abso ⁇ tive with respect to the volatile material to be dispensed, the volatile material to be dispensed being disposed in the pores.
  • the substrate is installed in the air stream, and the dispensing device is activated to direct the air stream to the substrate to release the volatile material from the pores, which volatile material is then dispensed.
  • the volatile material is an insect control active material it is preferred that the insect control active material be dispensed at an insect controlling rate until no more than 10% or even 5% residual volatile material remains in the pores, and that dispensing proceed at a substantially linear manner.
  • Figure 1A is a perspective view showing a prior art device for dispensing volatile materials from a wick according to the invention.
  • Figure IB is a side cross-sectional view of the device of Figure 1 A.
  • Figure 2 is a side cross-sectional view of an embodiment of a wick according to the invention being placed into the dispensing device of Figures 1A and IB.
  • Figure 3 is a side cross-sectional view of an embodiment of a wick according to the invention installed in the dispensing device of Figures 1 A and IB.
  • Figure 4A is a perspective view showing another prior art device for dispensing volatile materials from another wick according to the invention.
  • Figure 4B is a side cross-sectional view of the device of Figure 4A.
  • Figure 5 is a side cross-sectional view of another embodiment of another wick according to the invention being placed into the dispensing device of Figures 4 A and 4B.
  • Figure 6 is a side cross-sectional view of another embodiment of a wick according to the invention installed in the dispensing device of Figures 4A and 4B.
  • Figure 7 is a top, perspective view showing a prior art device for dispensing volatile materials from a porous mat according to the invention.
  • Figure 8 is a top perspective view of a porous mat according to the invention.
  • Figure 9 is a top perspective view of another porous mat according to the invention.
  • Figure 10 is a side perspective view of another embodiment of a porous mat according to the invention installed in another prior art dispensing device.
  • Figure 11 is a side perspective view of an embodiment of a porous plug according to the invention installed in the prior art dispensing device shown in Figure 10.
  • Like reference numerals will be used to refer to like or similar parts from Figure to Figure in the following description of the drawings.
  • FIG. 1A and IB there is shown a prior art heated volatile dispensing device 20 in which a heat source is used to promote the wicking action and release of a volatile material from a wick immersed in a volatile liquid contained in a reservoir.
  • the dispensing device 20 includes a body 21 having a vapor outlet 24 formed in the center of the top of the body 21.
  • a ring heater 25 having an opening extending vertically there through is provided inside the body 21 below the vapor outlet 24.
  • the ring heater 25 is supported by a stay 26.
  • a bottle socket 27 Provided under the heater 25 is a bottle socket 27 having an opening extending vertically there through.
  • the socket 27 is formed on its inner periphery with a threaded portion 30 adapted for threaded engagement with a threaded portion 29 on the outer periphery of the mouth 28a of a volatile liquid bottle 28.
  • the bottle 28 is provided with a wick 31 that is insertable into the ring heater 25 concentrically therewith when the bottle 28 is threaded at its mouth 28a into the socket 27.
  • the wick 31 is immersed in the liquid 34 in the bottle 28 and upwardly transports the liquid 34 contained in the bottle 28 by capillary action.
  • the wick 31 is typically formed from a fired porous ceramic or a sintered plastic material.
  • Electrical plug blades 32 in a pair are fixed to the body 21 on its rear side.
  • the plug blades 32 are connected to the ring heater 25 in the usual manner using electrical connections.
  • the ring heater 25 is energized by inserting the plug blades 32 into an electrical outlet and activating switch 35 whereby the ring heater 25 produces heat to heat the upper portion of the wick 31.
  • the heat may promote upward transport of the liquid 34 in the wick 31.
  • the liquid chemical 34 in the wick 31 is vaporized by the heat from the ring heater 25.
  • the wick 31 may be simply made of the substrate of the invention, whereupon even solutions containing natural pyrethrums can be delivered by the wick without the wick clogging, even over as much as forty-five, sixty, or more eight-hour nights, which are typical use expectations for insect control products delivering insect control actives via a wick to a heater.
  • a wick 31 may be cylindrical or any other convenient shape.
  • the porous peg 70 includes an inverted truncated cone shaped head 72 and a cylindrical body 74 that extends downwardly from the head 72.
  • the body 74 of the peg 70 is made small enough to be inserted from above into the hole 24 of the dispensing device 20, while the head 72 is made too wide to slip through the hole 24.
  • the body 74 of the peg 70 is also made small enough to be insertable into the ring heater 25 concentrically therewith as shown in Figure 3.
  • the head 72 at the top of the peg 70 is useful for handling, allowing a user to avoid touching the volatile material 22, which is dosed only in the center (as shown in the cross- sectional view) or on the lower portion.
  • the porous peg 70 is inserted into the dispensing device 20 by moving the peg 70 in the direction "A" shown in Figure 2.
  • the ring heater 25 is then energized by inserting the plug blades 32 into an electrical outlet and activating switch 35 whereby the ring heater 25 produces heat to heat the body 74 of the peg 70.
  • the volatile material 22 in the peg 70 is vaporized by the heat from the ring heater 25 and enters the surrounding atmosphere.
  • the materials used for the peg 70 and the preparation of the peg 70 are described below.
  • FIG. 4 A and 4B there is shown another prior art heated volatile dispensing device 20a in which a heat source is used to promote the wicking action and release of a volatile material from a wick immersed in a volatile liquid contained in a reservoir.
  • the dispensing device 20a includes a body 21 having a vapor outlet 24a formed in the center of the top of the body 21.
  • the vapor outlet 24a includes inwardly projecting fingers 24b which define a generally rectangular opening 24c.
  • a ring heater 25 having an opening extending vertically there through is provided inside the body 21 below the vapor outlet 24.
  • the heater 25 is supported by a stay 26.
  • a bottle socket 27 Provided under the heater 25 is a bottle socket 27 having an opening extending vertically there through.
  • the socket 27 is formed on its inner periphery with a threaded portion 30 adapted for threaded engagement with a threaded portion 29 on the outer periphery of the mouth 28a of a volatile liquid bottle 28.
  • the bottle 28 is provided with a wick 31 which is insertable into the ring heater 25 concentrically therewith when the bottle 28 is threaded at its mouth 28a into the socket 27.
  • the wick 31 upwardly transports a liquid 34 contained in the bottle 28 by capillary action.
  • the wick 31 is typically formed from a fired, porous ceramic or a sintered plastic material.
  • Electrical plug blades 32 in a pair are fixed to the body 21 on its rear side.
  • the plug blades 32 are connected to the ring heater 25 in the usual manner using electrical connections.
  • the ring heater 25 is energized by inserting the plug blades 32 into an electrical outlet and activating switch 35 whereby the ring heater 25 produces heat to heat the upper portion of the wick 31.
  • the heat may promote upward transport of the liquid 34 in the wick 31.
  • the liquid chemical in the wick 31 is vaporized by the heat from the ring heater 25.
  • FIG. 5 the dispensing device 20a is shown without the bottle 28 and associated wick 31, which are replaced by another embodiment of a porous peg 80 according to the invention that is impregnated with a volatile material.
  • the porous peg 80 includes a disk shaped head 82 and a body 84 that extends downwardly from the head 82.
  • the body 84 of the peg 80 is shown in a side view in Figure 5. It can be seen that in a side view, the perimeter of the body 84 of the peg 80 has an essentially rectangular shape.
  • the body 84 of the peg 80 is shown in a front view in Figure 6.
  • the body 84 of the peg 80 includes a lower section 84a having an essentially rectangular perimeter, a middle section 84b having an essentially V-shaped perimeter, and an upper section 83 that extends from the middle section 84b to the head 82.
  • the body 84 of the peg 80 With the peg 84 oriented as shown in Figure 5, the body 84 of the peg 80 is narrow enough to be inserted from above into the rectangular opening 24c of the dispensing device 20a, while the head 82 is made too wide to slip through the rectangular opening 24c.
  • the body 84 of the peg 80 is also made small enough to be insertable into the ring heater 25 concentrically therewith as shown in Figure 6.
  • the porous peg 80 is inserted into the dispensing device 20a by moving the peg 80 in the direction "B" shown in Figure 5.
  • the porous peg 80 may then be rotated 90 degrees into a position as shown in Figure 6.
  • the inwardly projecting fingers 24b of the vapor outlet 24a are positioned in grooves 83a and 83b between the middle section 84b and the head 82 of the peg 80.
  • the peg 80 is thereby secured in the dispensing device 20a until the peg is rotated 90 and lifted up and out of the dispensing device 20a.
  • the squared-off shank section of the shape shown fits into the existing, rectangular opening 24c in the top of the heater, entering only when turned to the correct position.
  • the peg can be turned, preventing its removal until turned again to its original position.
  • the ring heater 25 is then energized by inserting the plug blades 32 into an electrical outlet and activating switch 35 whereby the ring heater 25 produces heat to heat the body 84 of the peg 80.
  • the volatile material in the peg 80 is then vaporized by the heat from the ring heater 25 and enters the surrounding atmosphere.
  • the materials used for the peg 80 and the preparation of the peg 80 are described below.
  • FIG. 7 there is shown a prior art volatile material dispensing device in which a solid porous mat impregnated with a volatile material is heated to release the volatile material.
  • an electrical heater indicating generally at 40.
  • the heater is the "FUYI VAPE" heater previously described, except that the mat previously used with that heater has been replaced with a mat 50 of the present invention.
  • the heater 40 is an electrical resistance heater, and has a flat, upwardly exposed heating plate 42 on which is placed a mat 50 of the present invention.
  • An electrical plug 46 supplies electricity to the heating plate 42 by means of an electrical cord
  • the heating plate 42 is energized by inserting the plug 46 into an electrical outlet whereby the heating plate 42 produces heat to heat the mat 50.
  • the volatile material is vaporized by the heat from the heating plate 42.
  • the heating plate may be a ceramic or metal plate. This type of device is described in more detail in U.S. Patent No. 6,031,967. [0057] Referring now to Figure 8, there is shown one embodiment of a mat 50 according to the invention.
  • the mat 50 includes a body 52 and a handle 54 extending outwardly from the body 52.
  • the mat 50 is inserted into the heater 40 by moving the mat 50 in the direction "C" shown in Figure 7.
  • the mat 50 then rests on the heating plate 42.
  • the heater 40 is then energized by inserting the plug 46 into an electrical outlet whereby the heating plate 42 produces heat to heat the body 52 of the mat 50.
  • the volatile material in the mat 50 is then vaporized by the heat from the heating plate 42 and is released from the surface 56 of the mat 50 thereby entering the surrounding atmosphere.
  • the materials used for the mat 50 and the preparation of the mat 50 are described below.
  • FIG 9 there is shown another embodiment of a mat 60 according to the invention.
  • the mat 60 includes a body 62 and a handle 64 extending outwardly from the body 62.
  • the mat 60 is inserted into the heater 40 by moving the mat 60 in the direction "C" shown in Figure 7.
  • the mat 60 then rests on the heating plate 42.
  • the heater 40 is then energized by inserting the plug 46 into an electrical outlet whereby the heating plate 42 produces heat to heat the body 62 of the mat 60.
  • the volatile material in the mat 60 is then vaporized by the heat from the heating plate 42 and is released from the surface 66 of the mat 60 thereby entering the surrounding atmosphere.
  • the mat 60 differs from the mat 50 in that the mat 60 has a first region 68 impregnated with a first volatile material and a second region 69 impregnated with a second volatile material.
  • the first region 68 and the second region 69 provide the mat 60 with advantages, particularly when used in an insecticide delivery system.
  • a typical heater as shown in Figure 7 will have a warm up period in which the heating plate 42 ramps up to an operating temperature.
  • insecticide delivery can be tailored to the heating characteristics of the heating plate 42.
  • the insecticide in the first region 68 may be selected to rapidly evaporate at the lower temperatures of the heating plate warm up period
  • the insecticide in the second region 69 may be selected to slowly evaporate at the steady operating temperature of the heating plate.
  • the dispensing device 40 provides for an initial burst of insecticide (from the first region 68) that clears the surrounding atmosphere of insects and a steady slower release of insecticide (from the second region 69) that keeps the surrounding atmosphere free of insects.
  • the fastest acting volatile materials can be located where the heating plate surface heats the fastest (typically the central region of the heating plate).
  • FIG. 10 there is shown a prior art volatile material dispensing device in which a solid porous mat according to the invention is used.
  • the mat is impregnated with a volatile material, and is heated to release the volatile material.
  • the dispensing device 110 has a base 112 that supports a removable chimney 114, the chimney attaching to the base 112 with locking tabs formed on the lower edge of the chimney that mate with locking slots 115 formed in the base 112.
  • the chimney 114 can be made of a heat resistant clear or translucent plastic.
  • the base 112 supports a candle cup 116 positioned centrally within the chimney 114.
  • the candle cup 116 contains a wax candle.
  • the base 112 has a base floor 128 that has a central ventilation opening 129.
  • a ceiling 138 is positioned within the chimney 114 at its upper end.
  • the ceiling 138 has ceiling vents 140 and an insert slot 142 that communicate between the interior of the chimney 114 and the outside air above the chimney. Hot gases flowing upwardly from the burning candle 118 can escape the chimney 114 through the ceiling vents 140.
  • the insert slot 142 is sized to receive a mat 144 according to the invention.
  • the mat 144 includes a volatile bearing section 146 with laterally extending ears 148.
  • the volatile bearing section 146 of the mat 144 is made small enough to be inserted from above into the insert slot 142, while the ears 148 are made too wide to slip through the insert slot 142.
  • the volatile bearing section 146 can be suspended within the chimney 114, with the mat 144 hanging by the ears 148.
  • a baffle strip 150 made of a heat resistant material such as metal, is fastened to the underside of the ceiling 138.
  • the baffle strip 150 protects the downwardly facing edge of the volatile bearing section 146 from the direct impact of the hottest gases rising from the candle.
  • heating is accomplished by the direct exposure of the volatile bearing section 146 to gases from the candle.
  • volatile material is released and is carried out of the dispensing device 110 with the escaping hot gases. This type of device is described in more detail in PCT International Patent Publication No. WO 00/78135.
  • FIG 11 there is shown a prior art volatile material dispensing device 110a in which another solid porous structure according to the invention is used.
  • the solid porous structure is impregnated with a volatile material, and is heated to release the volatile material.
  • the volatile material dispensing device 110a of Figure 11 has the same features as the dispensing device 110 of Figure 10 except the mat 144 of the dispensing device 110 of Figure 10 has been replaced by a porous plug 144a in the dispensing device 110a of Figure 11.
  • the porous plug 144a is installed in a circular hole 188 in the ceiling 138a of the dispensing device 110a.
  • the porous plug 144a includes a disc shaped head
  • the porous plug 144a can be suspended within the chimney 114, with the body 144c hanging by the head 144b.
  • heating is accomplished by the direct exposure of the porous plug 144a to gases from the candle. As the porous plug 144a is heated by the gases, volatile material is released and is carried out of the dispensing device 110a with the escaping hot gases. The volatile material can be applied to the lower part of the plug 144a so that a user, by handling only the head 144b (the top-most part of the plug 144a) can avoid touching any volatile material.
  • the peg 70, the peg 80, the mat 50, the mat 60, the mat 144, wicks made of the substrate of the invention, and the porous plug 144a comprise sand particles adhered together to form a network of pores and passages.
  • the particles are adhered together, preferably by a binder.
  • individual sand particles are coated with a thin coating of the binder.
  • the coated sand particles are then placed in a mold and compacted under elevated temperature conditions.
  • the binder coated on the particles flows to form a thin coating on the individual particles, with the coatings fused together at their points of contact.
  • the binder only partially fills the interstices between the particles, whereby an interconnected network of pores and passages is formed.
  • the sand particles may comprise silica sand particles, chromite sand particles, zircon sand particles, and mixtures thereof.
  • Silica sand particles are typically preferred because a peg or mat formed using silica sand particles has superior fluid transport properties.
  • Rounded particles and preferably spherical particles are the best particles because of the greater uniformity in porosity achieved and because rounded particles can be closely packed together. The best uniformity in porosity is obtained by using particles that are uniform in size.
  • a number of different binders can be used to adhere the sand particles together.
  • thermoset polymeric materials i.e., materials that become relatively infusible upon heating
  • Thermoset polymeric materials are prefe ⁇ ed for the binder because these cross-linking polymeric materials will not flow when the formed peg or mat is heated in the dispensing device. If the binder were to flow excessively upon heating, clogging of the network of pores and passages could result.
  • thermoset polymeric material is not limited to traditional thermosetting materials but also encompasses cross linked thermoplastic materials that chemically react to become relatively infusible upon heating.
  • the preferred binder material is a novolac resin.
  • Other non-limiting examples of thermoset binder materials include urethane resins and highly cross linked thermoplastics such as cross linked polyethylene.
  • thermoset polymeric materials are preferred, any polymeric material can be used to bind the sand particles together, so long as the polymeric material is non-reactive and non-abso ⁇ tive with respect to the volatile material to be dispensed and the polymeric material can resist the temperatures to which the substrate will be exposed in the dispensing device.
  • Such materials will be familiar to those skilled in the art, including polymeric materials that set in response to various gas or other chemical or light treatment.
  • sand particles individually coated with the binder are flowable until adhered into a peg, mat, wick, or other shape, they may be introduced into molds of various sizes and shapes and heated to form virtually any shape structure for the peg 70, the peg 80, the mat 50, the mat 60, the mat 144, wicks made of the substrate of the invention, and the porous plug 144a.
  • the sand particles may be purchased pre-coated.
  • resin coated sand particles are available from Technisand Division of Fairmount Minerals, Wedron, Illinois, USA.
  • One type of commercially available resin coated sand comprises a phenol formaldehyde novolac resin
  • Another type of commercially available resin coated sand comprises a phenol formaldehyde novolac resin and a hexamethylenetetramine curing agent coated on chromite sand.
  • Yet another type of commercially available resin coated sand comprises a phenol formaldehyde novolac resin and a hexamethylenetetramine curing agent coated on zircon sand.
  • the peg 70, the peg 80, the mat 50, the mat 60, the mat 144, wicks made of the substrate of the invention, and the porous plug 144a are formed from a novolac resin coated silica sand.
  • the novolac resin coated silica sand is low pressure injected into a heated mold at 300°F-700°F to form the peg 70, the peg 80, the mat 50, the mat 60, the mat 144, wicks made of the substrate of the invention, and the porous plug 144a.
  • the mold heat completes the irreversible cross-linking of the novolac resin.
  • the network of pores and passages formed occupies at least 25 to 30% by volume percent of the peg 70, the peg 80, the mat 50, the mat 60, the mat 144, or the porous plug 144a, and most preferably, the network of pores and passages formed occupies at least 40% by volume percent of the peg 70, the peg 80, the mat 50, the mat 60, the mat 144, or the porous plug 144a.
  • the average pore size is in the range of 20 to 200 microns, and most preferably, the average pore size is in the range of 4 to 100 microns.
  • the substrate has different densities at different regions of the substrate.
  • the peg 70, the peg 80, the mat 50, the mat 60, the mat 144, wicks made of the substrate of the invention, and the porous plug 144a according to the invention have lower tortuosity and larger pore size while retaining adequate mass flow rate.
  • the construction of the peg 70, the peg 80, the mat 50, the mat 60, the mat 144, wicks made of the substrate of the invention, and the porous plug 144a inco ⁇ orates a polymeric binder in order to reduce the contact angle of the fluid.
  • polymeric surface coatings such as dimethyl silicone may be applied to the surfaces of the peg 70, the peg 80, the mat 50, the mat 60, the mat 144, wicks made of the substrate of the invention, and the porous plug 144a in order to further reduce the contact angle and shield any slight imperfections and discontinuities in the peg 70, the peg 80, the mat 50, the mat 60, the mat 144, wicks made of the substrate of the invention, and the porous plug 144a from the fluid where higher contact angles could result.
  • a volatile material is applied to the formed peg 70, peg 80, mat 50, mat 60, mat 144, or porous plug 144a to impregnate the pores with the volatile material before the peg 70, peg 80, mat 50, mat 60, mat 144, or porous plug 144a are inserted into the dispensing device.
  • the thermally volatilizable materials include air scents
  • the impregnated peg 70, peg 80, mat 50, mat 60, mat 144, or porous plug 144a may be partially overmolded with plastic.
  • the volatile material is an insecticide and/or insect repellent, organic phosphorous insecticides, lipidamide insecticides, natural repellents as citronella oil, natural pyrethrins and pyrethrum extract, and synthetic pyrethroids are preferred.
  • Suitable synthetic pyrethroids are acrinathrin, allethrin as D-allethrin, Pynamin®, benfluthrin, bifenthrin, bioallethrin as Pynamin Forte®, S-bioallethrin, esbiothrin, esbiol, bisoresmethrin, cycloprothrin, cyfluthrin, beta-cyfluthrin, cyhalothrin, lambda-cyhalothrin, cypermethrin, alpha-cypermethrin, beta-cypermethrin, cyphenothrin, deltamethrin, empenthrin, esfenvalerate, fenpropathrin, fenvalerate, flucythrinate, taufluvalinate, kadethrin, permethrin, phenothrin, prallethrin as Etoc
  • a substrate of the present invention is used for the pu ⁇ ose of delivering fragrance
  • various natural and artificial perfumes may be used.
  • these perfumes include animal-based and plant-based natural perfumes, and artificial perfumes such as alcohols, phenols, aldehydes, ketones, te ⁇ enes, and esters.
  • the choice of volatile material or mixtures of volatile materials may depend on the temperatures provided by the dispensing device. For instance, the heated volatile dispensing devices 20 and 20a of Figures 1A and 4 A typically produce a wick surface temperature of about 100°C when used with insecticides. Therefore, the volatile material or mixture of volatile materials is selected to provide an efficient release of the volatile materials from the peg 70 or the peg 80. Likewise, the heated volatile dispensing device
  • the volatile material or mixture of volatile materials is selected to provide an efficient release of the volatile materials from the mat 50 or the mat 60.
  • the heated volatile dispensing devices 100 and 110a of Figures 10 and 11 typically produces a mat surface temperature of about 160°C when used with insecticides. Therefore, the volatile material or mixture of volatile materials is selected to provide an efficient release of the volatile materials from the mat 144 or the peg 144a. Other optimum temperatures are used for air care products.
  • a substrate according to the invention has heat transfer properties whereby heat may be applied at one end of the substrate and the substrate transfers heat such that the substrate has a substantially and effectively uniform temperature throughout the substrate when compared to conventional mats and wicks..
  • heat transfer properties whereby heat may be applied at one end of the substrate and the substrate transfers heat such that the substrate has a substantially and effectively uniform temperature throughout the substrate when compared to conventional mats and wicks..
  • a more uniform release of the volatile materials is possible from all areas of the substrate.
  • conventional polymeric, fibrous, or ceramic wicks that have insulating properties (see, for example, U.S. Patent No. 3,652,197).
  • the mat 60 of Figure 9 has a first region 68 impregnated with a first volatile material and a second region 69 impregnated with a second volatile material.
  • the pore structure obtained using the sand or other non porous particles and a suitable binder provides for very controlled migration of a volatile material when the volatile material is applied to the formed mat 60.
  • a first volatile material is applied to the first region 68 of the mat 60
  • the first volatile material does not migrate into pores beyond the first region 68 of the mat 60.
  • a second volatile material is applied to the second region 69 of the mat 60
  • the second volatile material does not migrate into pores beyond the second region 69 of the mat 60.
  • the first volatile material and the second volatile material do not mix within the pores of the substrate.
  • the mat 60 is not limited to just two regions and two volatile materials, that is, any number of regions and volatile materials is possible.
  • the placement of different volatile materials in different regions of the mat 60 provides for tailored active materials delivery as described above with reference to faster acting and slower acting volatile materials.
  • the use of different types of volatile materials is also possible.
  • use up indicators such as a colored gel that co-evaporates independently of an insecticidal material, a dye in the formula that co-evaporates, and multiple volatile materials or actives (scents and insecticides), can provide an in-use cue and use-up cue.
  • a substrate e.g., the peg 70, the peg 80, the mat 50, the mat 60, the mat 144, wicks made of the substrate of the invention, and the porous plug 144a
  • the sand based substrate provides fewer declines in daily delivery rates from a dispensing device, and less clogging from polymerized active materials (e.g., pyrethrum and limonene) in liquid wick applications.
  • Volatile material migration is less with a substrate according to the invention versus conventional paper and ceramic wicks and mats thereby allowing for precise placement of different volatile materials at different regions of the substrate.
  • the substrate is also hotter in the center than existing paper mats which is an advantage for mat products.
  • An example substrate e.g., the peg 70, the peg 80, the mat 50, the mat 60, the mat 144, wicks made of the substrate of the invention, and the porous plug 144a
  • volatile material delivery is more linear in release over a longer interval of time than other known products. This linear release can be achieved by either and both cycling on/off or running continuously, unlike other products that are not as linear no matter how they are used. Linear and super-extended volatile material delivery duration can be achieved with a miniature sized part compared to other products on the market.
  • the superior thermal conductivity permits a wick to be used in conjunction with different temperature heaters or by adjusting the proximity of the wick to the heater to achieve any given desired temperature allowing for fast and slow volatile material release.
  • the substrate readily retains pure transfluthrin in the pores resulting in less seeping or leaking, while simultaneously allowing it to completely release (no retention, no residual) when heated. Therefore, less volatile material is required to achieve the same duration of other products due to the efficiency of the system not retaining volatile material.
  • the substrate readily absorbs pure transfluthrin into pores (quicker than ceramic or sawdust) without requiring solvents, heat, or drying, achieving the elimination of volatile organic compounds
  • VOC's emitted during the manufacturing operation.
  • Super extension of volatile release duration can be achieved with no VOC's emitted during operation due to the elimination of solvents, performance uncommon to the industry standard that uses solvents to extend release.
  • the substrate provides less clogging of additives that thermally degrade compared to ceramic or cellulose materials. The substrate works with liquids with a reservoir or without liquids as the reservoir.
  • Example 1 An insecticidal formulation suitable for impregnating the formed peg 70 or peg 80 can be prepared by mixing the following ingredients in Table 1.
  • the formed peg 70 or peg 80 of the present invention (which is suitable for use in electrically-heated liquid vaporizers) is compatible with the formulation of Table 1 which contains 1.2% Prallethrin, 1.25% pyrethrum, 2% butylated hydroxy toluene, 0.04% limonene and the balance isoparaffin solvent.
  • Table 1 which contains 1.2% Prallethrin, 1.25% pyrethrum, 2% butylated hydroxy toluene, 0.04% limonene and the balance isoparaffin solvent.
  • Table 1 which contains 1.2% Prallethrin, 1.25% pyrethrum, 2% butylated hydroxy toluene, 0.04% limonene and the balance isoparaffin solvent.
  • Table 1 which contains 1.2% Prallethrin, 1.25% pyreth
  • Example 2 Another insecticidal formulation suitable for impregnating the formed peg 70, peg 80 or mat 50 can be prepared by using the following ingredient in Table 2. Substrates can be dosed with transfluthrin by depositing the desired amount of that active in liquid form and free of solvents, directly on the substrate surface, whereupon it sinks promptly into the surface. Transfluthrin is solid at room temperature but forms a liquid at about 32°C. Thus, liquid forms of transfluthrin can be obtained by heating solid transfluthrin to a temperature of approximately 32°C or above. When loading a substrate according to the invention with straight transfluthrin as in this Example and heating the loaded substrate with an approximately 70°C heater, the transfluthrin comes off in a linear manner and essentially all of the transfluthrin comes off the substrate.
  • Example 3 An insecticidal formulation suitable for impregnating the formed mat 50 can be prepared by mixing the following ingredients in Table 3.
  • Example 4 An insecticidal formulation suitable for impregnating the mat 144 or porous plug 144a can be prepared by mixing the following ingredients in Table 4.
  • Example 5 A chemically-bonded sand wick was prepared by molding under compaction at an elevated temperature of at least 300 °F a commercially available novolac resin coated silica sand available from Technisand Division of Fairmount Minerals, Wedron, Illinois, USA.
  • the chemically-bonded sand wick exhibited a very fast rate of imbibition relative to ceramic and sawdust types of absorbent wicks used in conventional heated liquid electric dispensing devices. Electron micrographs showed a difference in pore size between the typical ceramic or sawdust wick and the chemically-bonded sand wick of the invention.
  • improved volatile impregnated substrates such as wicks and mats
  • active means such as a heat source or moving air
  • the invention satisfies a need for volatile impregnated substrates that provide improved efficacy, safety, cost, compatibility with existing volatile dispensing devices and environmental advantages.
  • the volatile release rate (e.g., mg./hr.) of a substrate according to the invention is more consistent over product life (e.g., intended use periods such as 8 hours, 12 hours, 45 days, 60 days) compared to conventional wicks and mats; the release rate duration can be extended beyond the product life of conventional wicks and mats; and a more consistent release rate (e.g., mg./hr.) more tolerable of heater/candle temperature variability is possible.
  • the substrate does not burn (volatile materials with solvents may burn out); the substrate provides gritty texture surface that is considered a dete ⁇ ent against child sucking; and the volatile material can stay in center of the substrate, where placed, and migrates to heat, making possible handles that help prevent finger contact with volatile material.
  • the substrate of the invention capitalizes on existing dispensing devices in the market; the sand based mat costs are comparable to a paper mat as many mats can be prepared in a single mold; the substrate can perform with or without the metal baffle strip 150 shown in Figures 10 and 11; the substrate can eliminate the need for the plastic bottle, wick, insert and solvent formula of Figures IB and 4B; and the substrate can use volatiles that do not require solvents.
  • the substrate is conducive to cost-effective designs for existing products with new shapes & textures (i.e., new lock-in key feature) and provides a longer lasting disposable product and a non-clogging refillable product.
  • the substrate is disposable with 96% natural organic elements, and has a low volatile residual, that is, the substrate empties to near zero milligrams of volatiles versus 30-60 milligrams of volatiles for existing wicks.
  • the invention relates to improved volatile material impregnated substrates, such as wicks and mats, that can be used in a dispensing device that uses active means
  • the volatilizable materials may be air scents (e.g. fragrances), pest control materials (e.g., insecticides), allergen control ingredients, disinfectants, and the like. Methods for making and using the invention are disclosed.

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Abstract

Volatile impregnated substrates (70), such as wicks and mats, that can be used in a dispensing device that uses a heat source or otherwise uses active (25) means to promote the release of the volatile material (22) from the substrate are disclosed. The preferred substrate has a structure including sand particles adhered together by a binder to form a network of pores and passages. The binder is selected from thermoset polymeric materials and mixtures thereof. A volatile material is disposed in the pores before the substrate (70) is installed in the dispensing device. The impregnated substrate is positioned in the dispensing device on or near the heat source (25) of the dispensing device. The heat source (25) is activated thereby elevating the temperature of the substrate such that volatile material is released from the pores. In one embodiment, the sand particles comprise silica sand and the binder is a cured novolac resin.

Description

Substrate for Volatile Delivery Systems
CROSS-REFERENCES TO RELATED APPLICATIONS
[0001] Not Applicable.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH [0002] Not Applicable.
BACKGROUND OF THE INVENTION
1. Field of the Invention
[0003] This invention relates to volatile dispensing devices that employ active means to dispense volatiles from a volatile-impregnated substrate. More particularly, the invention relates to improved volatile impregnated substrates, such as wicks and mats, that can be used in a volatile dispensing device that employs active means to dispense.
2. Description of the Related Art
[0004] The following definitions apply herein: An "effective amount" or an "effective delivery rate" and the like term is defined to mean that amount or rate sufficient to achieve the intended effect. "Active means" is defined as heat, moving air, or other means of imparting energy to a volatile material to be dispensed, and a volatile dispensing device that employs active means to dispense volatiles will be referred to as "actively dispensing" the volatile material. To be effective, insect control volatile active ingredients have to be delivered at no less than an "insect controlling rate," defined herein as that rate sufficient to repel or otherwise control target insects within the space to be protected. [0005] Devices for dispensing thermally or otherwise volatilizable materials into the atmosphere are well known. Such volatilizable materials may be air scents (e.g. fragrances), pest control materials (e.g., insecticides), allergen control ingredients, disinfectants, and the like. [0006] In one type of volatile material dispensing device, a heat source is used to promote the wicking action and release of a volatile material from a wick, one end of which is immersed in a volatile liquid contained in a reservoir. One version of this type of device is plugged into an electrical wall outlet to supply power to a heating coil within a housing. The generated heat raises the temperature of a material contained in the wick and volatilizes the material. Convection air currents dispense the volatilized material into the room. Examples of this type of device and related devices can be found in U.S. Patent Nos. 6,361,752; 5,647,053; 5,290,546; 5,222,186; 5,095,647; 5,038,394; and 4,663,315.
The disclosure of these patents and all other publications refeπed to herein are incoφorated herein by reference as if fully set forth.
[0007] In another type of volatile material dispensing device, a stiff, porous mat (commonly made of a pressed, cellulosic, fibrous material) is impregnated with a volatile material, or a volatile material is placed in a pan-like metal structure. These mats and pans are then placed on heaters to cause the volatile material to vaporize into the atmosphere. One type of heater used for this puφose is sold by S. C. Johnson & Son, Inc. under the trademark "FUYI VAPE". Examples of this type of device and related devices can be found in U.S. Patent Nos. 6,446,384; 6,309,986; 6,031,967; 5,945,094; and 4,391,781. [0008] In yet another type of volatile material dispensing device, a stiff, porous mat is impregnated with a volatile material, and the mat is held within the device such that a flow of hot gases from a fuel burner passes over the mat and causes the volatile material to vaporize into the atmosphere. An example of this type of device can be found in PCT International Patent Publication No. WO 00/78135. [0009] In yet another type of volatile material dispensing device, moving air is directed against a substrate or through a reticulated or otherwise airflow-transmitting substrate to thereby volatilize volatile material with the substrate has been impregnated. Examples of this type of device can be found in U.S. Patent No. 5,547,616 and in PCT International Patent Publication No. WO 01/02025. [0010] While all of these devices provide satisfactory results under certain circumstances, there are drawbacks to each type of device.
[0011] In devices that use a heat source to promote the release of a volatile material from a wick immersed in a volatile liquid composed of solvents and dissolved active ingredients, presently available wicking materials limit the performance of the wick of the device. For instance, when using porous wicks made of felt or fabric in such a device, there is a tendency as the wick is heated for the solvents to quickly volatilize off, thereby leaving high boiling point materials behind in the wick. The high boiling point materials remaining in the wick can cause clogging of the wick. Other wick materials include ceramics and compressed sawdust. However, these wicks experience the same sort of clogging when used in a device that uses a heat source to promote the release of a volatile material from a wick immersed in a volatile liquid. As a result, it is difficult to maintain stable evaporation of the volatile liquid for extended time periods. While uniform release of volatiles has been reported in U.S. Patent Nos. 4,286,754 for non-heated wicks, the problem of non-linear release in heated wicks remains. [0012] Certain volatile materials, such as some insecticide formulations, include materials that either are or become non- volatile when the liquid is heated in a wick. These non- volatile materials can cause clogging of the wick, which leads to a less uniform release rate of the volatile during use over time and to high residual levels of non- volatile materials in an expended wick. For example, pyrethrum insecticides typically include or form non- volatile waxes or polymers. During use in a dispenser having a conventional ceramic or sawdust wick, these waxes form sludges that can clog the wick. Thus, ceramic and sawdust wick systems do not allow effective utilization of insecticidal formulas that contain natural pyrethrins and teφenes. [0013] One proposed solution to the problems associated with the clogging of wicks by non- volatiles formed by oxidation of pyrethrum insecticides has been the use of antioxidants in the liquid formulation. See, for example, U.S. Patent No. 4,968,487. However, in spite of antioxidants, some cross-linking of the isoprene units in insecticidal liquid formulations occurs, forming non-volatile components that degrade the wicking performance of traditional wicks. The performance losses in these systems can be attributed to clogging of the small pores and the effects of the high tortuosity (twists and turns) in conventional wick materials.
[0014] Certain disadvantages are also seen with devices that use a heat source to promote the release of a volatile material from a solid or stiff porous mat impregnated with a volatile material or of a volatile material placed in a pan-like metal structure. One problem with the metal pan-like structures is that typical heaters can cause a volatile material to be exposed to too much heat. This can cause the volatile to be used up too fast or be deteriorated or destroyed through thermal degradation. Fibrous mats have similar but somewhat lesser problems in this regard.
[0015] Dispensing devices using heated mats also have problems with respect to the mats being exposed to differing temperatures across a heater surface. Existing heaters often have hotter regions at certain points along their heater surface, typically generally along a center line. The mats therefore can have uneven and incomplete vaporization. Uneven mat heating can cause the overall rate at which insect control volatile active ingredients are delivered to drop below the insect controlling rate for the active while considerable quantities of the active remain in poorly heated portions of the mat. Indeed, even aside from the issue of uneven heating, mats tend not to deliver a linear release of volatile materials. Commonly, the initial volatile delivery rate is comparatively high, as active accessibly near the surface of the mat quickly volatilizes. Once that accessible active is gone, migration of active from the interior of the mat to the surface can be slow, at least in part because of small, entrapping pores and very convoluted flow paths. The delivery rate decreases until the mat no longer delivers active at an insect controlling rate and must be replaced. It is not uncommon that conventional insecticide mats for use with conventional heaters have released only about 60% of their load of volatile material before the delivery rate falls below an effective, insect controlling delivery rate. This results in waste and therefore in increased cost for such mat products.
[0016] Another design consideration for insect control mats is that existing heaters often only accept slab-like inserts having a small cross-sectional shape, necessary to fit into a small heater loading port or opening. Thus, any mat design preferably takes into account size restrictions imposed by existing heaters. Yet another critical design consideration in this type of device is cost. Mats of this type are often used in countries that have very modest average annual incomes. To have much practical application in those countries, the mats must be inexpensive.
[0017] Thus, there is a need for an improved liquid-delivery wick that can be used in a dispensing device that uses a heat source or other active means to promote the release of a volatile material from the wick. Furthermore, there is a need for an improved porous mat that can be used in a dispensing device that uses a heat source or other active means to promote the release of a volatile material from the mat. In particular, there is a need for wicks and porous mats that provide improved efficacy (including but not limited to non- clogging, linear, and complete volatile release) and low cost, together with compatibility with existing dispensing devices.
BRIEF SUMMARY OF THE INVENTION [0018] The foregoing needs are met by a substrate made according to the invention for use in a volatile dispensing device that actively dispenses volatile material from the substrate. The substrate includes granular particles adhered together to form a body having a network of pores and passages, the interior surfaces of which are non-reactive and non-absoφtive with respect to the volatile material to be dispensed. The term "granular particles" is defined as meaning discrete, monolithic, compact particles (as distinct from linearly extended particles such as fiber strands or substantially continuous, porous materials such as ceramics) that, when packed in a confined space, have points of contact with neighboring particles but also leave open spaces between the particles. Sand particles are an example of such granular particles and are preferred both for their low cost, ability to withstand heat, and non-reactivity. However, glass, high density polymeric particles, and other particles are also possible. Preferred high density polymers are high density polycarbonate and polyethylene polymers. If the granular particles are non- organic, they can be adhered by any convenient means, including but not limited to point fusing by application of heat and/or pressure and/or the use of a polymerizing or other binder, coating, or the like that simply sticks the particles together, the latter means being preferred generally. However, if the granular particles are made of an organic material, the substrate of the invention is limited to particles adhered only by the use of a polymerizing or other binder, coating, or the like, without the use of any sintering step. "Point fusing" is defined as fusing only at points of contact between neighboring particles without a substantial change in the size and shape of the particles or the size and shape of the network of passages and pores left between the particles. [0019] A volatile material is disposed in the pores and passages. Activation of the volatile dispensing device releases the volatile material from the pores and passages, which volatile material is then dispensed. The volatile material may comprise an insect control active ingredient initially deliverable by the dispenser at an insect controlling rate, and preferably no more than 10% residual volatile material remains in the pores when the dispenser has so depleted the volatile material as to no longer be able to deliver the volatile material at the insect controlling rate. When the substrate is used in an insecticide dispensing device, the volatile material is preferably selected from natural pyrethrins, pyrethrum extract, synthetic pyrethroids, and mixtures thereof. When the substrate is used in an air treating dispensing device, the volatile material can be a fragrance or other volatile air treatment material.
[0020] In another aspect of the invention, a substrate for a dispensing device that employs active means to promote release of a volatile material from the substrate includes a body including granular particles adhered together by a binder to form a network of pores and passages. The binder is selected from cross-linked polymeric materials and mixtures thereof. In one preferred embodiment, the granular particles are sand particles (and, even more preferred, sand particles that include silica sand), and the binder is a cured phenolic resin such as novolac resin, which is commercially available from many sources. A volatile material is disposed in the pores, thereby impregnating the substrate, preferably before the substrate is installed in the dispensing device but also, optionally, after the substrate is located in or forms a permanent part of a device. In an example embodiment, the volatile dispensing device has a slot through which the substrate can be inserted to load the substrate into the volatile dispensing device, and the substrate is formed into a shape suitable for being suspended in the slot. [0021] The substrate of the invention is positioned in the dispensing device so as to be subjected to the active means for dispensing volatile materials. For example, for a dispensing device that uses heat as that active means, the substrate is positioned on or near the heat source of the dispensing device. In such a device, the heat source is activated, thereby elevating the temperature of the substrate such that volatile material is released from the pores. In a device employing air flow as the active means, the substrate is so placed as to be exposed to the air flow.
[0022] In a preferred substrate of the invention, the pores occupy at least 25% percent by volume of the substrate. It is also preferred that the pores have an average size in the range of 20 to 200 microns.
[0023] When using a substrate according to the invention in a heated volatile dispensing device, the volatile material is released from the pores at a substantially linear rate until release at an effective rate is no longer achieved. For example, if the volatile material is an insect control active such as transfluthrin, the volatile material is released substantially linearly at an insect controlling rate until an end point is reached, after which very little volatile material remains. Advantageously, as little as 10% residual volatile material remains in the pores after effective release of the volatile material from the substrate ceases, as evaluated and quantified by conventional gas chromatography and mass spectrometric methods. Even more preferred, no more than 5% residual volatile material remains in the pores after effective release of the volatile material from the substrate ceases, as evaluated and quantified by conventional gas chromatography and mass spectrometric methods.
[0024] When using a substrate according to the invention, many active ingredients can be used directly to impregnate the substrate, without having to dilute the active ingredients with a solvent. For example, an insect control mat of conventional size (approximately 3.5 by 2 cm.) can be dosed with transfluthrin by depositing the desired amount of that active in liquid form and free of solvents, directly on the mat surface, whereupon it sinks promptly into the mat surface. In contrast, transfluthrin similarly deposited on a conventional, cellulosic mat sinks into the mat so slowly as to be impractical for mass production of dosed mats. Consequently, for conventional mats, the transfluthrin must be dissolved in a solvent to aid liquid migration before such mats can be dosed. [0025] The method of the invention for delivering a volatile material from a dispensing device that uses a heat source to promote release of volatile materials from a wick designed to deliver a volatile liquid from a reservoir to a heated location within a heater wherein the volatile liquid can be heated and volatilized, includes the following steps. First, one provides, as a replacement for a conventional wick or, alternatively, for both a conventional wick and reservoir, a substrate having granular particles adhered together to form a body. The body has a network of pores and passages, the interior surfaces of which are non-reactive and non-absoφtive with respect to the volatile material to be dispensed, the body being so formed as to occupy the heated location within the heater. A volatile material is disposed in the pores. The substrate is placed within the dispensing device in the space normally occupied by a wick. Then the volatile dispensing device is activated to release the volatile material from the pores, which volatile material is then dispensed. [0026] In another aspect of the invention, a method is provided for dispensing a volatile material from a heating device having (a) an enclosed heating chamber designed to hold the a volatile-impregnated substrate therewithin, the heating chamber having chamber walls and being vented to the outside air; (b) a fuel burner; and (c) an air flow path to guide hot gases generated by the fuel burner past the substrate to heat the substrate and release the volatile material therefrom. The method includes the steps of first providing a substrate holdable by the enclosed heating chamber, the substrate having granular particles adhered together to form a body having a network of pores and passages, the interior surfaces of which are non-reactive and non-absoφtive with respect to the volatile material to be dispensed, the substrate also having the volatile material to be dispensed, disposed in the pores. The substrate is then installed in the heating chamber, and the fuel burner is activated to release the volatile material from the pores, which volatile material is then dispensed. In an example embodiment of this aspect of the invention, the volatile material is a substance that is non-liquid at a temperature of 30°C or below, such as transfluthrin. [0027] In yet another aspect of the invention, a method is provided for dispensing a volatile material from a dispensing device that uses a heat source to promote release of volatile materials from a substrate by application of heat from a heating surface. The method includes the steps of first providing a substrate of a size and shape selected to fit onto the heating surface, the substrate having granular particles adhered together to form a body having a network of pores and passages, the interior surfaces of which are non- reactive and non-absoφtive with respect to the volatile material to be dispensed. The substrate also has the volatile material to be dispensed, disposed in the pores. Then the substrate is installed on the heating surface, and the dispensing device is activated to cause the heating surface to heat to release the volatile material from the pores, which volatile material is then dispensed. In an example embodiment of this aspect of the invention, the volatile material is a substance that is non-liquid at a temperature of 30°C or below, such as transfluthrin.
[0028] In still another aspect of the invention, there is provided a method for delivering a volatile material from a dispensing device that uses a heat source to promote release of volatile materials from a wick designed to deliver a volatile liquid from a reservoir to a heated location within a heater wherein the volatile liquid can be heated and volatilized. First, one provides, as a volatile material in the liquid in the reservoir, an insect control active ingredient selected from the group consisting of natural pyrethrins, pyrethrum extract, synthetic pyrethroids, and mixtures thereof. Then, one provides, as a wick, a substrate comprising granular particles adhered together to form a body having a network of pores and passages. The interior surfaces of the substrate are non-reactive and non-absoφtive with respect to the volatile material to be dispensed. The body is formed to occupy the heated location within the heater, and activation of the heat source of the volatile dispensing device releases the volatile material from the pores to dispense the volatile material. The construction of the substrate serves to limit clogging of the pores by the pyrethrum insecticides and/or associated waxes.
[0029] In still another aspect of the invention, a method for delivering a volatile material from a dispensing device that uses a moving air stream to promote release of volatile materials from a substrate held within the air stream includes the following steps. A substrate is provided of a size and shape selected to be held in the air stream, the substrate having granular particles adhered together to form a body having a network of pores and passages, the interior surfaces of which are non-reactive and non-absoφtive with respect to the volatile material to be dispensed, the volatile material to be dispensed being disposed in the pores. The substrate is installed in the air stream, and the dispensing device is activated to direct the air stream to the substrate to release the volatile material from the pores, which volatile material is then dispensed. When the volatile material is an insect control active material it is preferred that the insect control active material be dispensed at an insect controlling rate until no more than 10% or even 5% residual volatile material remains in the pores, and that dispensing proceed at a substantially linear manner.
BRIEF DESCRIPTION OF THE DRAWINGS
[0030] These and other features, aspects, and advantages of the present invention will become better understood upon consideration of the following detailed description, appended claims, and drawings where: [0031] Figure 1A is a perspective view showing a prior art device for dispensing volatile materials from a wick according to the invention.
[0032] Figure IB is a side cross-sectional view of the device of Figure 1 A.
[0033] Figure 2 is a side cross-sectional view of an embodiment of a wick according to the invention being placed into the dispensing device of Figures 1A and IB. [0034] Figure 3 is a side cross-sectional view of an embodiment of a wick according to the invention installed in the dispensing device of Figures 1 A and IB.
[0035] Figure 4A is a perspective view showing another prior art device for dispensing volatile materials from another wick according to the invention.
[0036] Figure 4B is a side cross-sectional view of the device of Figure 4A. [0037] Figure 5 is a side cross-sectional view of another embodiment of another wick according to the invention being placed into the dispensing device of Figures 4 A and 4B.
[0038] Figure 6 is a side cross-sectional view of another embodiment of a wick according to the invention installed in the dispensing device of Figures 4A and 4B.
[0039] Figure 7 is a top, perspective view showing a prior art device for dispensing volatile materials from a porous mat according to the invention.
[0040] Figure 8 is a top perspective view of a porous mat according to the invention.
[0041] Figure 9 is a top perspective view of another porous mat according to the invention.
[0042] Figure 10 is a side perspective view of another embodiment of a porous mat according to the invention installed in another prior art dispensing device. [0043] Figure 11 is a side perspective view of an embodiment of a porous plug according to the invention installed in the prior art dispensing device shown in Figure 10. [0044] Like reference numerals will be used to refer to like or similar parts from Figure to Figure in the following description of the drawings.
DETAILED DESCRIPTION OF THE INVENΉON [0045] Referring to Figures 1A and IB, there is shown a prior art heated volatile dispensing device 20 in which a heat source is used to promote the wicking action and release of a volatile material from a wick immersed in a volatile liquid contained in a reservoir. The dispensing device 20 includes a body 21 having a vapor outlet 24 formed in the center of the top of the body 21. A ring heater 25 having an opening extending vertically there through is provided inside the body 21 below the vapor outlet 24. The ring heater 25 is supported by a stay 26. Provided under the heater 25 is a bottle socket 27 having an opening extending vertically there through. The socket 27 is formed on its inner periphery with a threaded portion 30 adapted for threaded engagement with a threaded portion 29 on the outer periphery of the mouth 28a of a volatile liquid bottle 28. [0046] As shown in Figure IB, the bottle 28 is provided with a wick 31 that is insertable into the ring heater 25 concentrically therewith when the bottle 28 is threaded at its mouth 28a into the socket 27. The wick 31 is immersed in the liquid 34 in the bottle 28 and upwardly transports the liquid 34 contained in the bottle 28 by capillary action. The wick 31 is typically formed from a fired porous ceramic or a sintered plastic material. [0047] Electrical plug blades 32 in a pair are fixed to the body 21 on its rear side. The plug blades 32 are connected to the ring heater 25 in the usual manner using electrical connections. The ring heater 25 is energized by inserting the plug blades 32 into an electrical outlet and activating switch 35 whereby the ring heater 25 produces heat to heat the upper portion of the wick 31. The heat may promote upward transport of the liquid 34 in the wick 31. The liquid chemical 34 in the wick 31 is vaporized by the heat from the ring heater 25. A more detailed description of this type of device can be found in U.S. Patent No. 5,290,546. [0048] The wick 31 may be simply made of the substrate of the invention, whereupon even solutions containing natural pyrethrums can be delivered by the wick without the wick clogging, even over as much as forty-five, sixty, or more eight-hour nights, which are typical use expectations for insect control products delivering insect control actives via a wick to a heater. Such a wick 31 may be cylindrical or any other convenient shape.
[0049] Turning now to Figures 2 and 3, the dispensing device 20 is shown without the bottle 28 and associated wick 31, which are replaced by a porous peg 70 according to the invention that is impregnated with a volatile material 22. The porous peg 70 includes an inverted truncated cone shaped head 72 and a cylindrical body 74 that extends downwardly from the head 72. The body 74 of the peg 70 is made small enough to be inserted from above into the hole 24 of the dispensing device 20, while the head 72 is made too wide to slip through the hole 24. The body 74 of the peg 70 is also made small enough to be insertable into the ring heater 25 concentrically therewith as shown in Figure 3. The head 72 at the top of the peg 70 is useful for handling, allowing a user to avoid touching the volatile material 22, which is dosed only in the center (as shown in the cross- sectional view) or on the lower portion.
[0050] The porous peg 70 is inserted into the dispensing device 20 by moving the peg 70 in the direction "A" shown in Figure 2. The ring heater 25 is then energized by inserting the plug blades 32 into an electrical outlet and activating switch 35 whereby the ring heater 25 produces heat to heat the body 74 of the peg 70. The volatile material 22 in the peg 70 is vaporized by the heat from the ring heater 25 and enters the surrounding atmosphere. The materials used for the peg 70 and the preparation of the peg 70 are described below. [0051] Referring to Figures 4 A and 4B, there is shown another prior art heated volatile dispensing device 20a in which a heat source is used to promote the wicking action and release of a volatile material from a wick immersed in a volatile liquid contained in a reservoir. The dispensing device 20a includes a body 21 having a vapor outlet 24a formed in the center of the top of the body 21. The vapor outlet 24a includes inwardly projecting fingers 24b which define a generally rectangular opening 24c. A ring heater 25 having an opening extending vertically there through is provided inside the body 21 below the vapor outlet 24. The heater 25 is supported by a stay 26. Provided under the heater 25 is a bottle socket 27 having an opening extending vertically there through. The socket 27 is formed on its inner periphery with a threaded portion 30 adapted for threaded engagement with a threaded portion 29 on the outer periphery of the mouth 28a of a volatile liquid bottle 28. [0052] As shown in Figure 4B, the bottle 28 is provided with a wick 31 which is insertable into the ring heater 25 concentrically therewith when the bottle 28 is threaded at its mouth 28a into the socket 27. The wick 31 upwardly transports a liquid 34 contained in the bottle 28 by capillary action. The wick 31 is typically formed from a fired, porous ceramic or a sintered plastic material. [0053] Electrical plug blades 32 in a pair are fixed to the body 21 on its rear side. The plug blades 32 are connected to the ring heater 25 in the usual manner using electrical connections. The ring heater 25 is energized by inserting the plug blades 32 into an electrical outlet and activating switch 35 whereby the ring heater 25 produces heat to heat the upper portion of the wick 31. The heat may promote upward transport of the liquid 34 in the wick 31. The liquid chemical in the wick 31 is vaporized by the heat from the ring heater 25. A more detailed description of this type of device can be found in U.S. Patent No. 5,290,546.
[0054] Turning now to Figures 5 and 6, the dispensing device 20a is shown without the bottle 28 and associated wick 31, which are replaced by another embodiment of a porous peg 80 according to the invention that is impregnated with a volatile material. The porous peg 80 includes a disk shaped head 82 and a body 84 that extends downwardly from the head 82. The body 84 of the peg 80 is shown in a side view in Figure 5. It can be seen that in a side view, the perimeter of the body 84 of the peg 80 has an essentially rectangular shape. The body 84 of the peg 80 is shown in a front view in Figure 6. It can be seen that in a front view, the body 84 of the peg 80 includes a lower section 84a having an essentially rectangular perimeter, a middle section 84b having an essentially V-shaped perimeter, and an upper section 83 that extends from the middle section 84b to the head 82. With the peg 84 oriented as shown in Figure 5, the body 84 of the peg 80 is narrow enough to be inserted from above into the rectangular opening 24c of the dispensing device 20a, while the head 82 is made too wide to slip through the rectangular opening 24c. The body 84 of the peg 80 is also made small enough to be insertable into the ring heater 25 concentrically therewith as shown in Figure 6.
[0055] The porous peg 80 is inserted into the dispensing device 20a by moving the peg 80 in the direction "B" shown in Figure 5. The porous peg 80 may then be rotated 90 degrees into a position as shown in Figure 6. When the peg 80 is in this position, the inwardly projecting fingers 24b of the vapor outlet 24a are positioned in grooves 83a and 83b between the middle section 84b and the head 82 of the peg 80. The peg 80 is thereby secured in the dispensing device 20a until the peg is rotated 90 and lifted up and out of the dispensing device 20a. Thus, the squared-off shank section of the shape shown fits into the existing, rectangular opening 24c in the top of the heater, entering only when turned to the correct position. Once in place, the peg can be turned, preventing its removal until turned again to its original position. After the peg 80 is inserted, the ring heater 25 is then energized by inserting the plug blades 32 into an electrical outlet and activating switch 35 whereby the ring heater 25 produces heat to heat the body 84 of the peg 80. The volatile material in the peg 80 is then vaporized by the heat from the ring heater 25 and enters the surrounding atmosphere. The materials used for the peg 80 and the preparation of the peg 80 are described below.
[0056] Turning now to Figure 7, there is shown a prior art volatile material dispensing device in which a solid porous mat impregnated with a volatile material is heated to release the volatile material. In Figure 7, there is shown an electrical heater, indicating generally at 40. The heater is the "FUYI VAPE" heater previously described, except that the mat previously used with that heater has been replaced with a mat 50 of the present invention. The heater 40 is an electrical resistance heater, and has a flat, upwardly exposed heating plate 42 on which is placed a mat 50 of the present invention. An electrical plug 46 supplies electricity to the heating plate 42 by means of an electrical cord
47. The heating plate 42 is energized by inserting the plug 46 into an electrical outlet whereby the heating plate 42 produces heat to heat the mat 50. The volatile material is vaporized by the heat from the heating plate 42. The heating plate may be a ceramic or metal plate. This type of device is described in more detail in U.S. Patent No. 6,031,967. [0057] Referring now to Figure 8, there is shown one embodiment of a mat 50 according to the invention. The mat 50 includes a body 52 and a handle 54 extending outwardly from the body 52. The mat 50 is inserted into the heater 40 by moving the mat 50 in the direction "C" shown in Figure 7. The mat 50 then rests on the heating plate 42. The heater 40 is then energized by inserting the plug 46 into an electrical outlet whereby the heating plate 42 produces heat to heat the body 52 of the mat 50. The volatile material in the mat 50 is then vaporized by the heat from the heating plate 42 and is released from the surface 56 of the mat 50 thereby entering the surrounding atmosphere. The materials used for the mat 50 and the preparation of the mat 50 are described below. [0058] Referring now to Figure 9, there is shown another embodiment of a mat 60 according to the invention. The mat 60 includes a body 62 and a handle 64 extending outwardly from the body 62. The mat 60 is inserted into the heater 40 by moving the mat 60 in the direction "C" shown in Figure 7. The mat 60 then rests on the heating plate 42. The heater 40 is then energized by inserting the plug 46 into an electrical outlet whereby the heating plate 42 produces heat to heat the body 62 of the mat 60. The volatile material in the mat 60 is then vaporized by the heat from the heating plate 42 and is released from the surface 66 of the mat 60 thereby entering the surrounding atmosphere. [0059] The mat 60 differs from the mat 50 in that the mat 60 has a first region 68 impregnated with a first volatile material and a second region 69 impregnated with a second volatile material. The first region 68 and the second region 69 provide the mat 60 with advantages, particularly when used in an insecticide delivery system. A typical heater as shown in Figure 7 will have a warm up period in which the heating plate 42 ramps up to an operating temperature. By using two regions 68, 69 with two different volatile materials such as two insecticides, insecticide delivery can be tailored to the heating characteristics of the heating plate 42. For example, the insecticide in the first region 68 may be selected to rapidly evaporate at the lower temperatures of the heating plate warm up period, and the insecticide in the second region 69 may be selected to slowly evaporate at the steady operating temperature of the heating plate. As a result, the dispensing device 40 provides for an initial burst of insecticide (from the first region 68) that clears the surrounding atmosphere of insects and a steady slower release of insecticide (from the second region 69) that keeps the surrounding atmosphere free of insects. The fastest acting volatile materials can be located where the heating plate surface heats the fastest (typically the central region of the heating plate). The materials used for the mat 60 and the preparation of the mat 60 are described below. [0060] In Figure 10, there is shown a prior art volatile material dispensing device in which a solid porous mat according to the invention is used. The mat is impregnated with a volatile material, and is heated to release the volatile material. The dispensing device 110 has a base 112 that supports a removable chimney 114, the chimney attaching to the base 112 with locking tabs formed on the lower edge of the chimney that mate with locking slots 115 formed in the base 112. The chimney 114 can be made of a heat resistant clear or translucent plastic. The base 112 supports a candle cup 116 positioned centrally within the chimney 114. The candle cup 116 contains a wax candle. The base 112 has a base floor 128 that has a central ventilation opening 129. [0061] A ceiling 138 is positioned within the chimney 114 at its upper end. The ceiling 138 has ceiling vents 140 and an insert slot 142 that communicate between the interior of the chimney 114 and the outside air above the chimney. Hot gases flowing upwardly from the burning candle 118 can escape the chimney 114 through the ceiling vents 140. The insert slot 142 is sized to receive a mat 144 according to the invention. The mat 144 includes a volatile bearing section 146 with laterally extending ears 148. The volatile bearing section 146 of the mat 144 is made small enough to be inserted from above into the insert slot 142, while the ears 148 are made too wide to slip through the insert slot 142. By this arrangement, the volatile bearing section 146 can be suspended within the chimney 114, with the mat 144 hanging by the ears 148. A baffle strip 150, made of a heat resistant material such as metal, is fastened to the underside of the ceiling 138. The baffle strip 150 protects the downwardly facing edge of the volatile bearing section 146 from the direct impact of the hottest gases rising from the candle. In the dispensing device 110 of Figure 10, heating is accomplished by the direct exposure of the volatile bearing section 146 to gases from the candle. As the volatile bearing section 146 is heated by the gases, volatile material is released and is carried out of the dispensing device 110 with the escaping hot gases. This type of device is described in more detail in PCT International Patent Publication No. WO 00/78135.
[0062] In Figure 11, there is shown a prior art volatile material dispensing device 110a in which another solid porous structure according to the invention is used. The solid porous structure is impregnated with a volatile material, and is heated to release the volatile material. The volatile material dispensing device 110a of Figure 11 has the same features as the dispensing device 110 of Figure 10 except the mat 144 of the dispensing device 110 of Figure 10 has been replaced by a porous plug 144a in the dispensing device 110a of Figure 11. The porous plug 144a is installed in a circular hole 188 in the ceiling 138a of the dispensing device 110a. The porous plug 144a includes a disc shaped head
144b and a cylindrical body 144c that extends downwardly from the head 144b. The body 144c of the plug 144a is made small enough to be inserted from above into the hole 188, while the head 144b is made too wide to slip through the hole 188. By this arrangement, the porous plug 144a can be suspended within the chimney 114, with the body 144c hanging by the head 144b. In the dispensing device 110a of Figure 11 , heating is accomplished by the direct exposure of the porous plug 144a to gases from the candle. As the porous plug 144a is heated by the gases, volatile material is released and is carried out of the dispensing device 110a with the escaping hot gases. The volatile material can be applied to the lower part of the plug 144a so that a user, by handling only the head 144b (the top-most part of the plug 144a) can avoid touching any volatile material.
[0063] Having described the arrangement of the peg 70 in the dispensing device 20 of Figures 1 A, IB, 2 and 3, the arrangement of the peg 80 in the dispensing device 20a of Figures 4A, 4B, 5 and 6, the arrangement of the mats 50 and 60 in the heater 40 of Figure 7, the arrangement of the mat 144 in the dispensing device 110 of Figure 10, and the arrangement of the porous plug 144a in the dispensing device 110a of Figure 11, a method for preparing the peg 70, the peg 80, the mat 50, the mat 60, the mat 144, wicks made of the substrate of the invention, and the porous plug 144a can be described. [0064] The peg 70, the peg 80, the mat 50, the mat 60, the mat 144, wicks made of the substrate of the invention, and the porous plug 144a comprise sand particles adhered together to form a network of pores and passages. The particles are adhered together, preferably by a binder. In one example method for making the peg 70, the peg 80, the mat 50, the mat 60, the mat 144, or the porous plug 144a, individual sand particles are coated with a thin coating of the binder. The coated sand particles are then placed in a mold and compacted under elevated temperature conditions. The binder coated on the particles flows to form a thin coating on the individual particles, with the coatings fused together at their points of contact. The binder only partially fills the interstices between the particles, whereby an interconnected network of pores and passages is formed. [0065] The sand particles may comprise silica sand particles, chromite sand particles, zircon sand particles, and mixtures thereof. Silica sand particles are typically preferred because a peg or mat formed using silica sand particles has superior fluid transport properties. Rounded particles and preferably spherical particles are the best particles because of the greater uniformity in porosity achieved and because rounded particles can be closely packed together. The best uniformity in porosity is obtained by using particles that are uniform in size. [0066] A number of different binders can be used to adhere the sand particles together.
Thermoset polymeric materials, i.e., materials that become relatively infusible upon heating, are prefeπed for the binder because these cross-linking polymeric materials will not flow when the formed peg or mat is heated in the dispensing device. If the binder were to flow excessively upon heating, clogging of the network of pores and passages could result. However, as used herein, the term "thermoset polymeric material" is not limited to traditional thermosetting materials but also encompasses cross linked thermoplastic materials that chemically react to become relatively infusible upon heating. The preferred binder material is a novolac resin. Other non-limiting examples of thermoset binder materials include urethane resins and highly cross linked thermoplastics such as cross linked polyethylene. Furthermore, although thermoset polymeric materials are preferred, any polymeric material can be used to bind the sand particles together, so long as the polymeric material is non-reactive and non-absoφtive with respect to the volatile material to be dispensed and the polymeric material can resist the temperatures to which the substrate will be exposed in the dispensing device. Such materials will be familiar to those skilled in the art, including polymeric materials that set in response to various gas or other chemical or light treatment.
[0067] Because sand particles individually coated with the binder are flowable until adhered into a peg, mat, wick, or other shape, they may be introduced into molds of various sizes and shapes and heated to form virtually any shape structure for the peg 70, the peg 80, the mat 50, the mat 60, the mat 144, wicks made of the substrate of the invention, and the porous plug 144a. Advantageously, the sand particles may be purchased pre-coated. For example, resin coated sand particles are available from Technisand Division of Fairmount Minerals, Wedron, Illinois, USA. One type of commercially available resin coated sand comprises a phenol formaldehyde novolac resin
(1-6% by total weight) and a hexamethylenetetramine curing agent (<2% by total weight) coated on an aggregate including iron oxides (<15% by total weight), aluminum silicate (<15% by total weight) and silica sand (i.e., quartz). Another type of commercially available resin coated sand comprises a phenol formaldehyde novolac resin and a hexamethylenetetramine curing agent coated on chromite sand. Yet another type of commercially available resin coated sand comprises a phenol formaldehyde novolac resin and a hexamethylenetetramine curing agent coated on zircon sand. [0068] In a most preferred embodiment, the peg 70, the peg 80, the mat 50, the mat 60, the mat 144, wicks made of the substrate of the invention, and the porous plug 144a are formed from a novolac resin coated silica sand. The novolac resin coated silica sand is low pressure injected into a heated mold at 300°F-700°F to form the peg 70, the peg 80, the mat 50, the mat 60, the mat 144, wicks made of the substrate of the invention, and the porous plug 144a. The mold heat completes the irreversible cross-linking of the novolac resin. Preferably, the network of pores and passages formed occupies at least 25 to 30% by volume percent of the peg 70, the peg 80, the mat 50, the mat 60, the mat 144, or the porous plug 144a, and most preferably, the network of pores and passages formed occupies at least 40% by volume percent of the peg 70, the peg 80, the mat 50, the mat 60, the mat 144, or the porous plug 144a. Preferably, the average pore size is in the range of 20 to 200 microns, and most preferably, the average pore size is in the range of 4 to 100 microns. In one form, the substrate has different densities at different regions of the substrate.
[0069] In contrast to standard wicks used in liquid-electric volatile dispensing devices that have small pores and high tortuosity (twists and turns), the peg 70, the peg 80, the mat 50, the mat 60, the mat 144, wicks made of the substrate of the invention, and the porous plug 144a according to the invention have lower tortuosity and larger pore size while retaining adequate mass flow rate. The construction of the peg 70, the peg 80, the mat 50, the mat 60, the mat 144, wicks made of the substrate of the invention, and the porous plug 144a incoφorates a polymeric binder in order to reduce the contact angle of the fluid. In addition to the polymeric binder, polymeric surface coatings such as dimethyl silicone may be applied to the surfaces of the peg 70, the peg 80, the mat 50, the mat 60, the mat 144, wicks made of the substrate of the invention, and the porous plug 144a in order to further reduce the contact angle and shield any slight imperfections and discontinuities in the peg 70, the peg 80, the mat 50, the mat 60, the mat 144, wicks made of the substrate of the invention, and the porous plug 144a from the fluid where higher contact angles could result.
[0070] A volatile material is applied to the formed peg 70, peg 80, mat 50, mat 60, mat 144, or porous plug 144a to impregnate the pores with the volatile material before the peg 70, peg 80, mat 50, mat 60, mat 144, or porous plug 144a are inserted into the dispensing device. Non-limiting examples of the thermally volatilizable materials include air scents
(e.g. fragrances), pest control materials (e.g., insecticides or insect repellents), allergen control ingredients, disinfectants, and the like. Optionally, the impregnated peg 70, peg 80, mat 50, mat 60, mat 144, or porous plug 144a may be partially overmolded with plastic. [0071] When the volatile material is an insecticide and/or insect repellent, organic phosphorous insecticides, lipidamide insecticides, natural repellents as citronella oil, natural pyrethrins and pyrethrum extract, and synthetic pyrethroids are preferred. Suitable synthetic pyrethroids are acrinathrin, allethrin as D-allethrin, Pynamin®, benfluthrin, bifenthrin, bioallethrin as Pynamin Forte®, S-bioallethrin, esbiothrin, esbiol, bisoresmethrin, cycloprothrin, cyfluthrin, beta-cyfluthrin, cyhalothrin, lambda-cyhalothrin, cypermethrin, alpha-cypermethrin, beta-cypermethrin, cyphenothrin, deltamethrin, empenthrin, esfenvalerate, fenpropathrin, fenvalerate, flucythrinate, taufluvalinate, kadethrin, permethrin, phenothrin, prallethrin as Etoc®, resmethrin, tefluthrin, tetramethrin, tralomethrin, or transfluthrin. Other volatile insecticides as described in U.S. Patent No. 4,439,415 can also be employed.
[0072] When a substrate of the present invention is used for the puφose of delivering fragrance, various natural and artificial perfumes may be used. Non-limiting examples of these perfumes include animal-based and plant-based natural perfumes, and artificial perfumes such as alcohols, phenols, aldehydes, ketones, teφenes, and esters. [0073] The choice of volatile material or mixtures of volatile materials may depend on the temperatures provided by the dispensing device. For instance, the heated volatile dispensing devices 20 and 20a of Figures 1A and 4 A typically produce a wick surface temperature of about 100°C when used with insecticides. Therefore, the volatile material or mixture of volatile materials is selected to provide an efficient release of the volatile materials from the peg 70 or the peg 80. Likewise, the heated volatile dispensing device
40 of Figure 7 typically produces a mat surface temperature of about 140°C to 170°C when used with insecticides. Therefore, the volatile material or mixture of volatile materials is selected to provide an efficient release of the volatile materials from the mat 50 or the mat 60. The heated volatile dispensing devices 100 and 110a of Figures 10 and 11 typically produces a mat surface temperature of about 160°C when used with insecticides. Therefore, the volatile material or mixture of volatile materials is selected to provide an efficient release of the volatile materials from the mat 144 or the peg 144a. Other optimum temperatures are used for air care products. One advantage of a substrate according to the invention is that the substrate has heat transfer properties whereby heat may be applied at one end of the substrate and the substrate transfers heat such that the substrate has a substantially and effectively uniform temperature throughout the substrate when compared to conventional mats and wicks.. Thus, a more uniform release of the volatile materials is possible from all areas of the substrate. This is not possible with conventional polymeric, fibrous, or ceramic wicks that have insulating properties (see, for example, U.S. Patent No. 3,652,197). [0074] As detailed above, the mat 60 of Figure 9 has a first region 68 impregnated with a first volatile material and a second region 69 impregnated with a second volatile material. This arrangement of the first volatile material and the second volatile material is possible because of the pore structures obtainable using the sand particles and binder of the present invention. Specifically, the pore structure obtained using the sand or other non porous particles and a suitable binder provides for very controlled migration of a volatile material when the volatile material is applied to the formed mat 60. When a first volatile material is applied to the first region 68 of the mat 60, the first volatile material does not migrate into pores beyond the first region 68 of the mat 60. Likewise, when a second volatile material is applied to the second region 69 of the mat 60, the second volatile material does not migrate into pores beyond the second region 69 of the mat 60. As a result, the first volatile material and the second volatile material do not mix within the pores of the substrate. It should be noted that the mat 60 is not limited to just two regions and two volatile materials, that is, any number of regions and volatile materials is possible. The placement of different volatile materials in different regions of the mat 60 provides for tailored active materials delivery as described above with reference to faster acting and slower acting volatile materials. The use of different types of volatile materials is also possible. For example, use up indicators, such as a colored gel that co-evaporates independently of an insecticidal material, a dye in the formula that co-evaporates, and multiple volatile materials or actives (scents and insecticides), can provide an in-use cue and use-up cue.
[0075] A substrate (e.g., the peg 70, the peg 80, the mat 50, the mat 60, the mat 144, wicks made of the substrate of the invention, and the porous plug 144a) according to the invention has many advantages. For example, the sand based substrate provides fewer declines in daily delivery rates from a dispensing device, and less clogging from polymerized active materials (e.g., pyrethrum and limonene) in liquid wick applications. Volatile material migration is less with a substrate according to the invention versus conventional paper and ceramic wicks and mats thereby allowing for precise placement of different volatile materials at different regions of the substrate. The substrate is also hotter in the center than existing paper mats which is an advantage for mat products. [0076] An example substrate (e.g., the peg 70, the peg 80, the mat 50, the mat 60, the mat 144, wicks made of the substrate of the invention, and the porous plug 144a) according to the invention having a transfluthrin insecticide is particularly advantageous. For instance, volatile material delivery is more linear in release over a longer interval of time than other known products. This linear release can be achieved by either and both cycling on/off or running continuously, unlike other products that are not as linear no matter how they are used. Linear and super-extended volatile material delivery duration can be achieved with a miniature sized part compared to other products on the market. Higher heat conductivity and improved heat distribution allow for improved volatile release properties owing to homogeneous material porosity and a pore structure that readily conducts heat throughout and distant from the heat source. The superior thermal conductivity permits a wick to be used in conjunction with different temperature heaters or by adjusting the proximity of the wick to the heater to achieve any given desired temperature allowing for fast and slow volatile material release. The substrate readily retains pure transfluthrin in the pores resulting in less seeping or leaking, while simultaneously allowing it to completely release (no retention, no residual) when heated. Therefore, less volatile material is required to achieve the same duration of other products due to the efficiency of the system not retaining volatile material. The substrate readily absorbs pure transfluthrin into pores (quicker than ceramic or sawdust) without requiring solvents, heat, or drying, achieving the elimination of volatile organic compounds
("VOC's") emitted during the manufacturing operation. Super extension of volatile release duration can be achieved with no VOC's emitted during operation due to the elimination of solvents, performance uncommon to the industry standard that uses solvents to extend release. The substrate provides less clogging of additives that thermally degrade compared to ceramic or cellulose materials. The substrate works with liquids with a reservoir or without liquids as the reservoir.
EXAMPLES [0077] The following Examples are presented in order to further illustrate the invention. They are not intended to limit the invention in any way. Example 1 [0078] An insecticidal formulation suitable for impregnating the formed peg 70 or peg 80 can be prepared by mixing the following ingredients in Table 1. The formed peg 70 or peg 80 of the present invention (which is suitable for use in electrically-heated liquid vaporizers) is compatible with the formulation of Table 1 which contains 1.2% Prallethrin, 1.25% pyrethrum, 2% butylated hydroxy toluene, 0.04% limonene and the balance isoparaffin solvent. Until the present time, clogging problems in typical ceramic and sawdust wick systems did not allow utilization of this type of formula, which contains natural components like pyrethrins and teφenes.
Table 1
Figure imgf000026_0001
Example 2 [0079] Another insecticidal formulation suitable for impregnating the formed peg 70, peg 80 or mat 50 can be prepared by using the following ingredient in Table 2. Substrates can be dosed with transfluthrin by depositing the desired amount of that active in liquid form and free of solvents, directly on the substrate surface, whereupon it sinks promptly into the surface. Transfluthrin is solid at room temperature but forms a liquid at about 32°C. Thus, liquid forms of transfluthrin can be obtained by heating solid transfluthrin to a temperature of approximately 32°C or above. When loading a substrate according to the invention with straight transfluthrin as in this Example and heating the loaded substrate with an approximately 70°C heater, the transfluthrin comes off in a linear manner and essentially all of the transfluthrin comes off the substrate.
Table 2
Figure imgf000027_0001
Example 3 [0080] An insecticidal formulation suitable for impregnating the formed mat 50 can be prepared by mixing the following ingredients in Table 3.
Table 3
Figure imgf000027_0002
Example 4 [0081] An insecticidal formulation suitable for impregnating the mat 144 or porous plug 144a can be prepared by mixing the following ingredients in Table 4.
Table 4
Figure imgf000027_0003
Figure imgf000028_0001
Example 5 [0082] A chemically-bonded sand wick was prepared by molding under compaction at an elevated temperature of at least 300 °F a commercially available novolac resin coated silica sand available from Technisand Division of Fairmount Minerals, Wedron, Illinois, USA. The chemically-bonded sand wick exhibited a very fast rate of imbibition relative to ceramic and sawdust types of absorbent wicks used in conventional heated liquid electric dispensing devices. Electron micrographs showed a difference in pore size between the typical ceramic or sawdust wick and the chemically-bonded sand wick of the invention.
When impregnated with the formula of Example 1, sawdust wicks in vaporizers showed a decline in delivery rate for the formula of Example 1 versus a control. When impregnated with the formula of Example 1, the chemically bonded sand wick of this Example showed no substantial decline in delivery rate over time for the test formula of Example 1 versus a control formula.
[0083] Thus, there has been provided improved volatile impregnated substrates, such as wicks and mats, that can be used in a dispensing device that uses active means (such as a heat source or moving air) to promote the release of the volatile material from the substrate. The invention satisfies a need for volatile impregnated substrates that provide improved efficacy, safety, cost, compatibility with existing volatile dispensing devices and environmental advantages.
[0084] In terms of improved efficacy, the volatile release rate (e.g., mg./hr.) of a substrate according to the invention is more consistent over product life (e.g., intended use periods such as 8 hours, 12 hours, 45 days, 60 days) compared to conventional wicks and mats; the release rate duration can be extended beyond the product life of conventional wicks and mats; and a more consistent release rate (e.g., mg./hr.) more tolerable of heater/candle temperature variability is possible. The substrate does not burn (volatile materials with solvents may burn out); the substrate provides gritty texture surface that is considered a deteπent against child sucking; and the volatile material can stay in center of the substrate, where placed, and migrates to heat, making possible handles that help prevent finger contact with volatile material. [0085] In terms of cost, the substrate of the invention capitalizes on existing dispensing devices in the market; the sand based mat costs are comparable to a paper mat as many mats can be prepared in a single mold; the substrate can perform with or without the metal baffle strip 150 shown in Figures 10 and 11; the substrate can eliminate the need for the plastic bottle, wick, insert and solvent formula of Figures IB and 4B; and the substrate can use volatiles that do not require solvents. With respect to compatibility, the substrate is conducive to cost-effective designs for existing products with new shapes & textures (i.e., new lock-in key feature) and provides a longer lasting disposable product and a non-clogging refillable product. In terms of environmental advantages, the substrate is disposable with 96% natural organic elements, and has a low volatile residual, that is, the substrate empties to near zero milligrams of volatiles versus 30-60 milligrams of volatiles for existing wicks.
[0086] Although the present invention has been described in considerable detail with reference to certain embodiments, one skilled in the art will appreciate that the present invention can be practiced by other than the described embodiments, which have been presented for puφoses of illustration and not of limitation. Therefore, the scope of the appended claims should not be limited to the description of the embodiments contained herein.
INDUSTRIAL APPLICABILITY [0087] The invention relates to improved volatile material impregnated substrates, such as wicks and mats, that can be used in a dispensing device that uses active means
(such as a heat source or moving air) to promote the release of the volatile material from the substrate. The volatilizable materials may be air scents (e.g. fragrances), pest control materials (e.g., insecticides), allergen control ingredients, disinfectants, and the like. Methods for making and using the invention are disclosed.

Claims

1. A substrate for use in a volatile dispensing device that actively dispenses volatile material from the substrate, the substrate comprising: granular particles adhered together to form a body having a network of pores and passages, the interior surfaces of which are non-reactive and non-absoφtive with respect to the volatile material to be dispensed; and a volatile material disposed in the pores, the volatile material comprising an insect control active ingredient initially deliverable by the dispenser at an insect controlling rate; wherein activation of the volatile dispensing device releases the volatile material from the pores, which volatile material is then dispensed, and wherein no more than 10% residual volatile material remains in the pores when the dispenser has so depleted the volatile material as to no longer be able to deliver the volatile material at the insect controlling rate.
2. The substrate of claim 1 wherein the insect control active ingredient is selected from the group consisting of natural pyrethrins, pyrethrum extract, synthetic pyrethroids, and mixtures thereof.
3. The substrate of claim 1 wherein the insect control active ingredient is selected from the group consisting of transfluthrin, bioallethrin, prallethrin, pyrethrum extract, and mixtures thereof.
4. The substrate of claim 1 wherein the volatile material is essentially free of solvents when applied to the body.
5. The substrate of claim 1 wherein the insect control active ingredient is transfluthrin.
6. The substrate of claim 1 wherein the insect control active ingredient is released from the pores at a substantially linear rate when the volatile dispensing device releases the volatile material from the pores by heating the body.
7. The substrate of claim 1 wherein the body includes a keying structure that engages a portion of the dispensing device to secure the body in the dispensing device.
8. The substrate of claim 1 wherein the particles comprise sand.
9. The substrate of claim 1 wherein the binder is a phenolic resin.
10. The substrate of claim 1 wherein the dispenser supplies heat to a portion of the body less than the whole, and the body has heat transfer properties whereby heat applied to the portion of the body is transfeπed at a volatile-releasing rate to the remaining portions of the body.
11. The substrate of claim 1 formed into a flat slab suitable for use as a mat for dispensing volatiles from a volatile dispensing device that delivers heat to volatile-bearing mats.
12. A substrate for use in a volatile dispensing device that actively dispenses volatile material from the substrate, the volatile dispensing device having a slot through which the substrate can be inserted to load the substrate into the volatile dispensing device, the substrate comprising: granular particles adhered together to form a body having a network of pores and passages, the interior surfaces of which are non-reactive and non-absoφtive with respect to the volatile material to be dispensed; and a volatile material disposed in the pores; wherein the substrate is formed into a shape suitable for being inserted in the slot, and wherein activation of the volatile dispensing device releases the volatile material from the pores, which volatile material is then dispensed.
13. The substrate of claim 12 wherein the volatile material comprises an insect control active ingredient initially deliverable by the dispenser at an insect controlling rate.
14. The substrate of claim 13 wherein no more than 10% residual volatile material remains in the pores when the dispenser has so depleted the volatile material as to no longer be able to deliver the volatile material at the insect controlling rate.
15. The substrate of claim 12 wherein the volatile material comprises an insect control active ingredient selected from the group consisting of natural pyrethrins, pyrethrum extract, synthetic pyrethroids, and mixtures thereof.
16. The substrate of claim 12 wherein the volatile material comprises an insect control active ingredient selected from the group consisting of transfluthrin, bioallethrin, prallethrin, pyrethrum extract, and mixtures thereof.
17. The substrate of claim 12 wherein the volatile material is essentially free of solvents when applied to the body.
18. The substrate of claim 17 wherein the volatile material comprises transfluthrin.
19. The substrate of claim 12 wherein the insect control active ingredient is released from the pores at a substantially linear rate when the volatile dispensing device releases the volatile material from the pores by heating the body.
20. The substrate of claim 12 wherein the body includes a keying structure that engages a portion of the dispensing device to secure the body in the dispensing device.
21. The substrate of claim 12 wherein the substrate includes a first volatile material disposed in the pores in a first region of the body and a second volatile material disposed in the pores in a second region of the body.
22. The substrate of claim 21 wherein the first volatile material vaporizes at a first temperature and the second volatile material vaporizes at a second temperature higher than the first temperature.
23. The substrate of claim 21 wherein the first volatile material and the second volatile material do not mix within the pores of the substrate.
24. The substrate of claim 12 wherein the dispenser supplies heat to a portion of the body less than the whole, and the body has heat transfer properties whereby heat applied to the portion of the body is transfeπed at a volatile-releasing rate to the remaining portions of the body.
25. The subsfrate of claim 12 wherein the substrate has different pore sizes and porosities at different regions of the body.
26. The substrate of claim 12 wherein the volatile material comprises a fragrance.
27. The substrate of claim 12 wherein: the volatile material is released from the pores at an substantially linear rate until the action of the dispenser releases no more volatile material at an effective rate.
28. A method for delivering a volatile material from a dispensing device that uses a heat source to promote release of volatile materials from a wick designed to deliver a volatile liquid from a reservoir to a heated location within a heater wherein the volatile liquid can be heated and volatilized, the method comprising the steps of: a. providing, as a replacement for the combination of a conventional wick and reservoir, a substrate comprising: i. granular particles adhered together to form a body shaped to occupy the heated location within the heater, the body having no access to a liquid reservoir and having a network of pores and passages, the interior surfaces of which are non-reactive and non-absoφtive with respect to the volatile material to be dispensed, the body being formed to occupy the heated location within the heater; and ii. a volatile material disposed in the pores; iii. wherein activation of the volatile dispensing device releases the volatile material from the pores, which volatile material is then dispensed; and b. activating the heat source.
29. The method of claim 28 wherein the volatile material is an insect control active material that is dispensed at an insect controlling rate until no more than 10% residual volatile material remains in the pores.
30. A method for dispensing a volatile material from a heating device having an enclosed heating chamber designed to hold the a volatile-impregnated substrate therewithin, the heating chamber having chamber walls and being vented to the outside air; a fuel burner; and an air flow path to guide hot gases generated by the fuel burner past the substrate to heat the substrate and release the volatile material therefrom, the method comprising the steps of: a. providing a substrate holdable by the enclosed heating chamber, the substrate having: i. granular particles adhered together to form a body having a network of pores and passages, the interior surfaces of which are non- reactive and non-absoφtive with respect to the volatile material to be dispensed; and ii. the volatile material to be dispensed, disposed in the pores; b. installing the substrate in the heating chamber; and c. activating the fuel burner to release the volatile material from the pores, which volatile material is then dispensed.
31. The method of claim 30 wherein the volatile material is an insect control active material that is dispensed at an insect controlling rate until no more than 10% residual volatile material remains in the pores.
32. The method of claim 30 wherein the volatile material is transfluthrin.
33. A method for delivering a volatile material from a dispensing device that uses a heat source to promote release of volatile materials from a substrate by application of heat from a heating surface, the method comprising the steps of: a. providing a substrate of a size and shape selected to fit onto the heating surface, the substrate having: i. granular particles adhered together to form a body having a network of pores and passages, the interior surfaces of which are non- reactive and non-absoφtive with respect to the volatile material to be dispensed; and ii. the volatile material to be dispensed, disposed in the pores; b. installing the substrate on the heating surface; and c. activating the dispensing device to cause the heating surface to heat to release the volatile material from the pores, which volatile material is then dispensed.
34. The method of claim 33 wherein the volatile material is an insect control active material that is dispensed at an insect controlling rate until no more than 10% residual volatile material remains in the pores.
34. The method of claim 33 wherein the volatile material is transfluthrin.
35. A method for delivering a volatile material from a dispensing device that uses a heat source to promote release of volatile materials from a wick designed to deliver a volatile liquid from a reservoir to a heated location within a heater wherein the volatile liquid can be heated and volatilized, the method comprising the steps of: a. providing, as a replacement for a conventional wick, a substrate comprising: i. granular particles adhered together to form a body having a network of pores and passages, the interior surfaces of which are non- reactive and non-absoφtive with respect to the volatile material to be dispensed, the body being formed to occupy the heated location within the heater; and ii. a volatile material disposed in the pores; iii. wherein activation of the volatile dispensing device releases the volatile material from the pores, which volatile material is then dispensed; and b. activating the heat source.
36. A method for delivering a volatile material from a dispensing device that uses a heat source to promote release of volatile materials from a wick designed to deliver a volatile liquid from a reservoir to a heated location within a heater wherein the volatile liquid can be heated and volatilized, the method comprising the steps of: a. providing as a volatile material in the liquid in the reservoir an insect control active ingredient selected from the group consisting of natural pyrethrins, pyrethrum extract, synthetic pyrethroids, and mixtures thereof; b. providing as a wick a substrate comprising granular particles adhered together to form a body having a network of pores and passages, the interior surfaces of which are non-reactive and non-absoφtive with respect to the volatile material to be dispensed, the body being formed to occupy the heated location within the heater, wherein activation of the volatile dispensing device releases the volatile material from the pores, which volatile material is then dispensed; and c. activating the heat source.
37. The method of claim 36 wherein the insect control active ingredient is selected from the group consisting of natural pyrethrins, pyrethrum extract, and mixtures thereof.
38. A method for delivering a volatile material from a dispensing device that uses a moving air stream to promote release of volatile materials from a substrate held within the air stream, the method comprising the steps of: a. providing a substrate of a size and shape selected to be held in the air stream, the substrate having: i. granular particles adhered together to form a body having a network of pores and passages, the interior surfaces of which are non- reactive and non-absoφtive with respect to the volatile material to be dispensed; and ii. the volatile material to be dispensed, disposed in the pores; b. installing the substrate in the air stream; and c. activating the dispensing device to direct the air stream to the substrate to release the volatile material from the pores, which volatile material is then dispensed.
39. The method of claim 38 wherein the volatile material is an insect control active material that is dispensed at an insect controlling rate until no more than 10% residual volatile material remains in the pores.
PCT/US2004/002591 2003-01-30 2004-01-30 Substrate for volatile delivery systems WO2004068945A1 (en)

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BRPI0407063 BRPI0407063A (en) 2003-01-30 2004-01-30 Substrate for volatile delivery systems
JP2006503167A JP5068995B2 (en) 2003-01-30 2004-01-30 Substrates for volatile material delivery systems
CN200480005640.6A CN1756479B (en) 2003-01-30 2004-01-30 Substrate for volatile delivery systems
DE200460010614 DE602004010614T2 (en) 2003-01-30 2004-01-30 A process for the active delivery of volatile substances from a donor
AU2004209908A AU2004209908B2 (en) 2003-01-30 2004-01-30 Substrate for volatile delivery systems
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005070203A1 (en) * 2004-01-15 2005-08-04 S. C. Johnson & Son, Inc. Volatiles releasing substrates and methods for preparing them
WO2007089928A1 (en) * 2006-02-03 2007-08-09 S. C. Johnson & Son, Inc. Air treatment devices with use-up indicators
WO2008049656A1 (en) 2006-10-24 2008-05-02 Henkel Ag & Co. Kgaa Fragrance release system
WO2008085363A1 (en) 2007-01-08 2008-07-17 S. C. Johnson & Son, Inc. Combination light device with insect control ingredient emission
WO2009102206A1 (en) * 2008-02-15 2009-08-20 Sara Lee/De N.V. Dosage unit for a sustained release insecticide composition
WO2013180985A1 (en) * 2012-06-01 2013-12-05 S.C. Johnson & Son, Inc. Clog resistant insect control formulations having terminal diyne acetylenic hydrocarbon and pyrethrin
WO2017143311A1 (en) * 2016-02-19 2017-08-24 Hazel Technologies, Inc. Compositions for controlled release of active ingredients and methods of making same
WO2017215728A1 (en) * 2016-06-16 2017-12-21 Ctr, Lda Device for dispensing, in particular for vaporizing, volatile substances, in particular fragrances and/or active agents

Families Citing this family (47)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040265164A1 (en) * 2000-07-27 2004-12-30 The Procter & Gamble Company Methods, devices, compositions, and systems for improved scent delivery
US7138130B2 (en) * 2003-01-30 2006-11-21 S.C. Johnson & Son, Inc. Substrate for volatile delivery systems
GB0525981D0 (en) * 2005-12-21 2006-02-01 Reckitt Benckiser Au Pty Ltd An emanating device
US7820188B2 (en) * 2006-02-07 2010-10-26 S.C. Johnson & Son, Inc. Air treatment device with controlled pore size substrate
US20070194144A1 (en) * 2006-02-22 2007-08-23 Davis Brian T Air treatment device with heated volatile dispenser
US20070237688A1 (en) * 2006-04-07 2007-10-11 Andrew Walker Fragrance oil dispenser
DE102006023413A1 (en) * 2006-05-17 2007-11-22 Bayer Cropscience Ag Soaked with insecticidal paper
US8232509B2 (en) * 2006-11-16 2012-07-31 S.C. Johnson & Son, Inc. Retainer system
WO2008069345A1 (en) * 2006-12-07 2008-06-12 Sumitomo Chemical Company, Limited Pest control device
US7892487B2 (en) * 2006-12-13 2011-02-22 S.C. Johnson & Son, Inc. Useful life indicators
US7544332B2 (en) * 2007-03-12 2009-06-09 S.C. Johnson & Son, Inc. Air treatment dispensers delivering multiple chemicals
US8047837B2 (en) * 2007-06-28 2011-11-01 S.C. Johnson & Son, Inc. Candle with lid for dispensing an air treatment chemical
US20090101730A1 (en) 2007-10-19 2009-04-23 Davis Brian T Vented Dispensing Bottle/Cap Assembly
EP2224829A4 (en) * 2007-12-04 2011-05-04 Stonewick Inc Fragrance dispensing wick and method
MY179385A (en) * 2008-09-12 2020-11-05 Sumitomo Chemical Co Structural body, method for producing the same, vapordispensing device, vapor-dispensing method, and kit for vapor dispensation
WO2010072724A2 (en) * 2008-12-23 2010-07-01 Basf Se Process and aqueous formulation for the impregnation of non-living-materials imparting a protective activity against pests
CN106267289B (en) * 2009-10-13 2020-07-31 菲利普莫里斯生产公司 Aerosol generator
US8693852B2 (en) * 2010-05-19 2014-04-08 Partylite Worldwide, Inc. Warmers for scented oils
EP2394512A1 (en) * 2010-06-08 2011-12-14 Sara Lee/DE B.V. Method for the sustained release of an insecticidally active compound
US8666236B2 (en) 2010-12-20 2014-03-04 S.C. Johnson & Son, Inc. Heater assembly for volatile liquid dispenser
US20120183280A1 (en) * 2011-01-19 2012-07-19 Idc Enchanted Lighting Company, Llc Fragrance producing lighting device
US8412029B2 (en) * 2011-01-19 2013-04-02 Idc Enchanted Lighting Company, Llc Fragrance producing lighting device
US20130323292A1 (en) * 2012-06-01 2013-12-05 Lina Long Clog Resistant Insect Control Formulations Containing Pyrethrin, An Acetylenic Compound, And A Hydrocarbon Diene
US8920734B2 (en) 2012-07-03 2014-12-30 S.C. Johnson & Son, Inc. Candle dispenser device
US9669126B2 (en) * 2012-08-06 2017-06-06 S.C. Johnson & Son, Inc. Volatile material dispenser and method of emitting a volatile material
EP2712897A1 (en) * 2012-10-01 2014-04-02 Akzo Nobel Coatings International B.V. Improved Insecticidal Paints
US9541279B2 (en) 2013-06-18 2017-01-10 S. C. Johnson & Son, Inc. Candle dispenser
US9258988B2 (en) * 2013-07-16 2016-02-16 University Of Florida Research Foundation, Inc. Methods and devices for sustained release of substances
US9149031B2 (en) 2013-09-13 2015-10-06 S.C. Johnson & Son, Inc. Portable area repellent device
US10378558B2 (en) 2013-09-13 2019-08-13 S.C. Johnson & Son, Inc. Air treatment chemical dispenser having angled dispersion of chemicals
US9352062B2 (en) 2013-10-30 2016-05-31 S.C. Johnson & Son, Inc. Wearable chemical dispenser
SI3096613T1 (en) * 2014-01-21 2022-10-28 Thermacell Repellents, Inc. Improved mat structure with insecticide
US10363333B2 (en) 2014-04-02 2019-07-30 S.C. Johnson & Son, Inc. Wax warmer
US10238097B2 (en) 2014-05-29 2019-03-26 S.C. Johnson & Son, Inc. Candle dispenser
US9352064B2 (en) 2014-06-05 2016-05-31 S. C. Johnson & Son, Inc. Wearable chemical dispenser
EP3193949A1 (en) 2014-08-15 2017-07-26 S.C. Johnson & Son, Inc. Wax warmers
JP2018500098A (en) * 2014-12-23 2018-01-11 コーニンクレッカ フィリップス エヌ ヴェKoninklijke Philips N.V. Effective air treatment device for antibacterial and antiviral
WO2017083667A1 (en) * 2015-11-11 2017-05-18 Scent2Market Inc. Pyrethrum wax candle
US20200038540A1 (en) * 2018-08-06 2020-02-06 Huan-Ping LEE Rotatable aromatherapy lamp
US11484022B2 (en) 2019-10-15 2022-11-01 S. C. Johnson & Son, Inc. Insect trap device
EP4195921A4 (en) * 2020-08-12 2024-09-25 Thermacell Repellents Inc Linkable insect repeller station and control system
CN216533460U (en) * 2021-12-24 2022-05-17 深圳维冠通实业有限公司 Mosquito dispeller for dual purposes of mosquito-repellent incense tablet and mosquito-repellent incense liquid
BE1030394B1 (en) * 2022-03-28 2023-10-24 Oystershell Nv DELIVERY DEVICE FOR VOLATILE SUBSTANCES
USD1007657S1 (en) * 2022-04-04 2023-12-12 Ontel Products Corporation Personal air cooling tower
USD1029983S1 (en) 2022-07-26 2024-06-04 Wyndscent, Llc Hunting scent generator
EP4327654A1 (en) * 2022-08-23 2024-02-28 Zobele Holding SpA Device for evaporating volatile substances
DE102023200878A1 (en) 2023-02-03 2024-08-08 Henkel Ag & Co. Kgaa Spatial protection against flying insects based on natural pyrethrum

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4286754A (en) * 1976-05-10 1981-09-01 Minnesota Mining And Manufacturing Company Controlled-rate liquid dispenser
US4849181A (en) * 1985-11-27 1989-07-18 Lad Technology Heat activated dispenser for vaporizable materials
US4968487A (en) * 1986-09-02 1990-11-06 Fumakilla Limited Heat fumigation apparatus
US5038394A (en) * 1988-02-10 1991-08-06 Earth Chemical Co., Ltd. Thermal vaporizer
GB2289409A (en) * 1994-05-20 1995-11-22 Zeiss Stiftung Porous body for the storage and regulated release of vapourizing substances
EP0841070A2 (en) * 1996-11-12 1998-05-13 FALP S.r.l. Method for producing wicks for containers of vaporizable solutions
GB2327349A (en) * 1997-07-18 1999-01-27 Body Shop Int Plc Fragrance vaporising device
US6031967A (en) * 1999-02-17 2000-02-29 S. C. Johnson & Son, Inc. Device for dispensing volatile materials
US6482365B1 (en) * 2001-09-14 2002-11-19 S.C. Johnson & Son, Inc. Volatile dispenser lamp

Family Cites Families (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US100327A (en) * 1870-03-01 Improved disinfecting compounds
US3166615A (en) 1960-12-30 1965-01-19 James A Farrell Method of forming porous rigid structures
US3652197A (en) 1970-05-12 1972-03-28 Richard D Tokarz Nonconsumable wick
US3995595A (en) * 1974-04-15 1976-12-07 Williams Robert W Animal feed device containing an insecticidal cartridge
LU82279A1 (en) * 1980-03-21 1981-10-30 Airwick Ag DEVICES FOR THE EMISSION OF INSECTICIDE VAPORS
IN152745B (en) 1980-03-21 1984-03-24 Airwick Ag
US4391781A (en) 1982-03-22 1983-07-05 S. C. Johnson & Son, Inc. Electrically heated vapor dispenser
GR82163B (en) 1984-01-31 1984-12-13 Earth Chemical Co
JPS60161902A (en) * 1984-01-31 1985-08-23 Earth Chem Corp Ltd Insecticidal solution composition for core to suck up solution
US4627963A (en) 1984-02-29 1986-12-09 Lad Technology, Inc. Heat activated dispenser and method of dispensing a vapor therefrom
EG18025A (en) * 1986-07-18 1993-06-30 Sumitomo Chemical Co A method for killing insects by heating fumigation
JPH0636704B2 (en) * 1986-09-02 1994-05-18 フマキラ−株式会社 Liquid-wicking core for heating evaporation
DE3737272C2 (en) * 1986-11-19 1989-10-26 Fumakilla Ltd HEATING GASKET OPERATING
US5290546A (en) 1988-02-10 1994-03-01 Earth Chemical Co., Ltd. Method for thermal vaporization of chemical
US4968478A (en) * 1988-02-22 1990-11-06 Burda Paul A Corrosion inhibition of closed cooling water auxiliary system for nuclear power plants
IT1231085B (en) 1989-09-29 1991-11-12 Zobele Ind Chim APPARATUS TO KEEP VOLATILE INSECTS AWAY FROM PEOPLE, IN PARTICULAR MOSQUITOES AND MANUFACTURING PROCEDURE.
JPH0622552B2 (en) * 1989-12-13 1994-03-30 キング化学株式会社 Liquid-wicking core for heating evaporation
JPH04237449A (en) * 1991-01-21 1992-08-25 Fumakilla Ltd Liquid-absorbing core for thermal evaporation
JP3275080B2 (en) * 1991-09-05 2002-04-15 フマキラー株式会社 Heat evaporator for wicking heat evaporator
US5222186A (en) 1991-12-06 1993-06-22 Globol Gmbh Electrical apparatus for vaporizing of active substances
JP3308291B2 (en) * 1992-01-22 2002-07-29 フマキラー株式会社 Heat-evaporation drug-containing body and method for heat-evaporation of drug using the same
JPH06277269A (en) * 1993-03-24 1994-10-04 Unitika Ltd Production of porous liquid absorbent core for transpiration
JP3250122B2 (en) * 1993-04-02 2002-01-28 フマキラー株式会社 Chemical liquid evaporator in heating evaporator
JP3227506B2 (en) * 1993-08-20 2001-11-12 株式会社南方除虫粉製造所 Smoking agent
JP3422825B2 (en) * 1993-09-21 2003-06-30 フマキラー株式会社 Heat evaporation of chemicals
US5547616A (en) 1995-05-08 1996-08-20 S. C. Johnson & Son, Inc. Device for dispensing a volatile active ingredient
US5647053A (en) 1995-10-11 1997-07-08 S. C. Johnson & Son, Inc. Vapor dipensing device
US5733952A (en) 1995-10-18 1998-03-31 Borden Chemical, Inc. Foundry binder of phenolic resole resin, polyisocyanate and epoxy resin
WO1997030782A1 (en) * 1996-02-20 1997-08-28 Mikuni Corporation Method for producing granulated material
US5945094A (en) 1997-04-14 1999-08-31 S. C. Johnson & Son, Inc. Disposable plug-in dispenser for use with air freshener and the like
US6078728A (en) * 1998-06-22 2000-06-20 S. C. Johnson & Son, Inc. Volatile carrier for use with a heating device
US6222186B1 (en) * 1998-06-25 2001-04-24 Agilent Technologies, Inc. Power-modulated inductively coupled plasma spectrometry
JP2000103704A (en) * 1998-09-29 2000-04-11 Earth Chem Corp Ltd Liquid absorption wick for transpiration by heating
PT1029451E (en) * 1999-02-17 2003-04-30 Johnson & Son Inc S C DEVICE FOR DISPENSING VOLACATE MATERIALS
US6309986B1 (en) 1999-05-07 2001-10-30 S. C. Johnson & Son, Inc. Mat for dispensing volatile materials
US6361752B1 (en) 1999-05-19 2002-03-26 S. C. Johnson & Son, Inc. Apparatus for volatilizing and dispensing a chemical into a room environment
BR0011710A (en) 1999-06-17 2002-04-30 Johnson & Son Inc S C Heated material distributor
US6371450B1 (en) 1999-07-01 2002-04-16 S. C. Johnson & Son, Inc. Battery powered volatile dispenser having an electrical power cut-off for a visible fan
JP2001096149A (en) * 1999-10-01 2001-04-10 Kuraray Chem Corp Porous adsorbent and filter
JP4194729B2 (en) * 2000-02-22 2008-12-10 クラレケミカル株式会社 Porous adsorbent and filter
IT1318553B1 (en) * 2000-06-01 2003-08-27 Zobele Ind Chimiche S P A Ora ELECTRO-EMANATOR FOR THE EVAPORATION OF DISINFESTATION PRODUCTS.
US6551560B1 (en) * 2000-08-31 2003-04-22 S. C. Johnson & Son, Inc. Two-stage dispensing mat
US7138130B2 (en) * 2003-01-30 2006-11-21 S.C. Johnson & Son, Inc. Substrate for volatile delivery systems

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4286754A (en) * 1976-05-10 1981-09-01 Minnesota Mining And Manufacturing Company Controlled-rate liquid dispenser
US4849181A (en) * 1985-11-27 1989-07-18 Lad Technology Heat activated dispenser for vaporizable materials
US4968487A (en) * 1986-09-02 1990-11-06 Fumakilla Limited Heat fumigation apparatus
US5038394A (en) * 1988-02-10 1991-08-06 Earth Chemical Co., Ltd. Thermal vaporizer
GB2289409A (en) * 1994-05-20 1995-11-22 Zeiss Stiftung Porous body for the storage and regulated release of vapourizing substances
EP0841070A2 (en) * 1996-11-12 1998-05-13 FALP S.r.l. Method for producing wicks for containers of vaporizable solutions
GB2327349A (en) * 1997-07-18 1999-01-27 Body Shop Int Plc Fragrance vaporising device
US6031967A (en) * 1999-02-17 2000-02-29 S. C. Johnson & Son, Inc. Device for dispensing volatile materials
US6482365B1 (en) * 2001-09-14 2002-11-19 S.C. Johnson & Son, Inc. Volatile dispenser lamp

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7258868B2 (en) 2004-01-15 2007-08-21 S.C. Johnson & Son, Inc. Volatile releasing substrates and methods for preparing them
KR100813487B1 (en) * 2004-01-15 2008-03-13 에스.씨. 존슨 앤드 선, 인코포레이티드 Volatiles releasing substrates and methods for preparing them
WO2005070203A1 (en) * 2004-01-15 2005-08-04 S. C. Johnson & Son, Inc. Volatiles releasing substrates and methods for preparing them
US7670566B2 (en) 2006-02-03 2010-03-02 S.C. Johnson & Son, Inc. Air treatment devices with use-up indicators
WO2007089928A1 (en) * 2006-02-03 2007-08-09 S. C. Johnson & Son, Inc. Air treatment devices with use-up indicators
JP2009525394A (en) * 2006-02-03 2009-07-09 エス.シー. ジョンソン アンド サン、インコーポレイテッド Air treatment device with a single-use indicator
EP2193811A1 (en) 2006-02-03 2010-06-09 S. C. Johnson & Son, Inc. Air treatment devices with use-up indicators
AU2007211212B2 (en) * 2006-02-03 2010-05-20 S. C. Johnson & Son, Inc. Air treatment devices with use-up indicators
WO2008049656A1 (en) 2006-10-24 2008-05-02 Henkel Ag & Co. Kgaa Fragrance release system
WO2008085363A1 (en) 2007-01-08 2008-07-17 S. C. Johnson & Son, Inc. Combination light device with insect control ingredient emission
EP2098119A1 (en) * 2008-02-15 2009-09-09 Sara Lee/DE N.V. Sustained release insecticide composition
WO2009102206A1 (en) * 2008-02-15 2009-08-20 Sara Lee/De N.V. Dosage unit for a sustained release insecticide composition
WO2013180985A1 (en) * 2012-06-01 2013-12-05 S.C. Johnson & Son, Inc. Clog resistant insect control formulations having terminal diyne acetylenic hydrocarbon and pyrethrin
US8664270B2 (en) 2012-06-01 2014-03-04 S.C. Johnson & Son, Inc. Clog resistant insect control formulations having terminal diyne acetylenic hydrocarbon and pyrethrin
ES2711980R1 (en) * 2016-02-19 2019-05-13 Hazel Tech Inc Compositions for controlled release of active ingredients and preparation methods thereof
WO2017143311A1 (en) * 2016-02-19 2017-08-24 Hazel Technologies, Inc. Compositions for controlled release of active ingredients and methods of making same
ES2820879R1 (en) * 2016-02-19 2021-06-21 Hazel Tech Inc Compositions for the controlled release of active ingredients and methods of their preparation
US11278023B2 (en) 2016-02-19 2022-03-22 Hazel Technologies, Inc. Compositions for controlled release of active ingredients and methods of making same
IL261176B1 (en) * 2016-02-19 2023-03-01 Hazel Tech Inc Compositions for controlled release of active ingredients and methods of making same
ES2933249R1 (en) * 2016-02-19 2023-03-09 Hazel Tech Inc Compositions for the controlled release of active ingredients and methods of preparation thereof
IL261176B2 (en) * 2016-02-19 2023-07-01 Hazel Tech Inc Compositions for controlled release of active ingredients and methods of making same
WO2017215728A1 (en) * 2016-06-16 2017-12-21 Ctr, Lda Device for dispensing, in particular for vaporizing, volatile substances, in particular fragrances and/or active agents
US11911539B2 (en) 2016-06-16 2024-02-27 Ctr, Lda Device for dispensing, in particular for vaporizing, volatile substances, in particular fragrances and/or active agents

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US7629001B2 (en) 2009-12-08
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