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WO2002058812A2 - Filtre a air avec biocides microencapsules - Google Patents

Filtre a air avec biocides microencapsules Download PDF

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Publication number
WO2002058812A2
WO2002058812A2 PCT/US2001/047809 US0147809W WO02058812A2 WO 2002058812 A2 WO2002058812 A2 WO 2002058812A2 US 0147809 W US0147809 W US 0147809W WO 02058812 A2 WO02058812 A2 WO 02058812A2
Authority
WO
WIPO (PCT)
Prior art keywords
filter
biocide
air
slurry
microcapsules
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2001/047809
Other languages
English (en)
Other versions
WO2002058812A3 (fr
Inventor
Stewart R. Kaiser
Joseph T. Terleski
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
R-Tec Technologies Inc
Original Assignee
R-Tec Technologies 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 R-Tec Technologies Inc filed Critical R-Tec Technologies Inc
Priority to AU2002248174A priority Critical patent/AU2002248174A1/en
Publication of WO2002058812A2 publication Critical patent/WO2002058812A2/fr
Publication of WO2002058812A3 publication Critical patent/WO2002058812A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/08—Filter cloth, i.e. woven, knitted or interlaced material
    • B01D39/083—Filter cloth, i.e. woven, knitted or interlaced material of organic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/08—Filter cloth, i.e. woven, knitted or interlaced material
    • B01D39/086—Filter cloth, i.e. woven, knitted or interlaced material of inorganic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
    • B01D46/0028—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions provided with antibacterial or antifungal means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/04—Additives and treatments of the filtering material
    • B01D2239/0435—Electret
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/04—Additives and treatments of the filtering material
    • B01D2239/0442—Antimicrobial, antibacterial, antifungal additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/04—Additives and treatments of the filtering material
    • B01D2239/045—Deodorising additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/04—Additives and treatments of the filtering material
    • B01D2239/0471—Surface coating material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/04—Additives and treatments of the filtering material
    • B01D2239/0471—Surface coating material
    • B01D2239/0478—Surface coating material on a layer of the filter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/08—Special characteristics of binders
    • B01D2239/083—Binders between layers of the filter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/12—Special parameters characterising the filtering material
    • B01D2239/1216—Pore size

Definitions

  • the subject invention relates to filters for heating, ventilation and air conditioning systems, and more particularly to an air filter coated with microencapsulated biocides that substantially reduces the quantity of harmful and odor causing microorganisms, bacteria and virii in filtered air, as well as methods of using and making such an air filter.
  • Outdoor air contains many substances, ranging from eye-burning smog to sneeze-provoking pollen to headache-causing fumes to irritating cigarette smoke.
  • samples of outdoor air may contain soot, smoke, ozone, silica, clay, decayed animal and vegetable matter, lint and plant fibers, metallic fragments, mold spores, bacteria, pollen, and a range of gaseous emissions from business and industrial processes.
  • HVAC heating, ventilation and air conditioning
  • Air filters of various thicknesses, textures and materials have been used to filter airborne dirt and dust particles by straining or impinging the particles upon a filter medium as air passes through the filter.
  • Another design to remove smaller particles is a high efficiency particulate air (HEPA) filter.
  • HEPA filter is capable of removing 99.97% of all particulate matter greater than 0.3 ⁇ m in size.
  • Another method for disinfecting air is the ultraviolet light type filter.
  • air passing through is bathed in ultraviolet light of a specific wavelength designed to destroy microorganisms.
  • ultraviolet light of a specific wavelength designed to destroy microorganisms.
  • U.S. Patent No. 5,523,057 discloses a filter chamber with a conventional intake filter to remove large particulates, a series of ultraviolet lamps producing a specific wavelength of ultraviolet light to destroy airborne bacteria and an activated charcoal filter to remove odors at the exit point.
  • a filter chamber was described with a conventional intake filter to remove large particulates, a series of ultraviolet lamps producing a specific wavelength of ultraviolet light to destroy airborne bacteria and an activated charcoal filter to remove odors at the exit point.
  • Maintaining this system would require changing the conventional intake filter, the charcoal exit filter, and the ultraviolet lamps within the sealed chamber. It also requires an external power source for operating the ultraviolet lamps.
  • a third alternative is the use of an electrostatic precipitator type filter system.
  • a system of this type uses electricity to charge the particulate matter in the air stream and an opposing grounded collector plate for collecting the charged particulates. Although this works to remove particulates from the atmosphere, including harmful pathogens, it does not provide a method for destroying these pathogens and they will accumulate and pose a threat to human health inside the electrostatic precipitator.
  • An improvement on this were disclosed in U.S. Patent No. 5,993,738 that combined an electrostatic precipitator with a photocatalyst and ultraviolet light to destroy the pathogens accumulating on the collector plates. However, this is a large system requiring frequent maintenance to clean the plates and exposing personal to potential hazards within the system.
  • This system combines the use of a conventional filter in conjunction with a form of germicidal or biocidal agent embedded or incorporated into the filter material to remove harmful pathogens from the environment.
  • a recent example is U.S. Patent No.
  • the patent discloses a preferred method for application of these antimicrobial agents as being incorporated into the woven fibers of the filter media.
  • a solution of the antimicrobial agent may be sprayed directly onto the filter media.
  • U.S. Patent No. 4,534,775 issued to Frazier on August 13, 1985, discloses an air treatment filter containing an antimicrobial agent that is incorporated into a liquid within the filter itself. That disclosure reveals a filter for removing odors and harmful gases from the air while the antimicrobial agent inhibits growth of microorganisms.
  • 3,017,239 disclose methods of applying germicides to air filters. All three disclosures teach mixing the selected germicide in a solvent and applying the resulting mixture to the air filter media to destroy airborne pathogens and prevent trapped pathogens from multiplying. [0012] In another area of commerce, it is known that n-alkyl (50% C14, 40% C12, 10% C16) dimethyl benzyl ammonium saccharinate, in small quantities of 1% or less, can be used as a disinfectant to sanitize, control and prevent mold and mildew along with their odors.
  • This saccharinate composition can kill 99.9% of listed bacteria, fungi, virii (pathogens), rhino virus (common cold), herpes simplex virus type 1 & 2, adenovirus type 2, rotavirus, salmonella, staphlococcus aureus (staph), polio virus type 1 , klebsiella pneumolae (k. pneumoniae), E-coli, respiratory syncytial virus, hepatitis A, and campylobacter.
  • This chemical composition is used as an active ingredient in disinfecting sprays for surfaces and the air. Due to rapid dissipation, it is only suitable for short term disinfecting as an aerosol mist.
  • a third objective of the subject invention is to maintain an air filter free of harmful pathogens so that the filter does not become a breeding ground for various harmful pathogens and a source for releasing these pathogens into the surrounding environs.
  • a further objective of the subject invention is to provide a biocidal coating for an air filter wherein the biocide is suspended in a viscous solvent and the viscous solvent traps pathogens by impingement.
  • Another objective of the subject invention is to provide an air filter coated with a biocide that is effective in killing pathogens when laden with particulate matter.
  • a final objective of the subject invention is provide an air filter coated with a biocide that does not reduce the air flow characteristics of the filter.
  • the above stated objects are met by a new and improved air filter coated with a microencapsulated biocidal agent.
  • the subject air filter comprises a filter medium made from tightly woven materials, such as fiberglass or polyester, preferably with openings in size of one micrometer (1 ⁇ m) or less. This tightly woven filter medium will function to remove dust, dirt or any large particulate matter from an air stream.
  • the filter medium will be coated with a microencapsulated biocidal agent to kill germs, bacteria, virii, fungi, mold and such, that pass through the air filter, adhere to the other particulate matter, or adhere to the filter medium itself.
  • the biocidal agent is microencapsulated in a porous shell that allows the biocide's pathogen killing effect to be uniformly released over time.
  • the biocidal agent is suspended in a viscous solvent within the porous shell. Diffusion of the biocidal containing solvent maintains a uniform effectiveness of the biocide and also traps pathogens by viscous impingement. Preferably, the biocide will be released over a period of time equal to the useful life of the filter medium.
  • the new and improved air filter can be employed in a typical residential or commercial HVAC system to drastically reduce bacteria, fungi, virii, dirt, dust and odors in homes, schools, hospitals and commercial buildings.
  • the subject air filter can be adapted for any HVAC system, including those used on planes, buses, ships and other locales where filtered air is desirable. Additionally, the new and improved filter can be adapted for use in military applications. BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a perspective view of the air filter with microencapsulated biocides of the subject invention.
  • FIG. 2 is an enlarged view of a microencapsulated biocide in accordance with the subject invention.
  • FIG. 3 is a cross-sectional view of a filter medium with a plurality of microencapsulated biocides applied to the front and back surface.
  • FIG. 4 is a cross-sectional view of the air filter of FIG. 1 employing two layers of filter medium. DESCRIPTION OF THE INVENTION
  • a new and improved air filter 10 is provided to remove and destroy all microbial matter, as well as removing dust, dirt and particulate matter from the airflow through an HVAC system.
  • the air filter 10 comprises a filter medium 12 and a frame 14.
  • the filter medium 12 of the air filter 10 is coated with microcapsules 16.
  • the filter medium 12 will normally remove particulate matter, including dirt, dust, leaves and insects.
  • the filter medium 12 of the air filter 10 can be any known medium in the art.
  • One such air filter medium is the dry, fibrous type. Dry, fibrous media are made of glass fibers, cellulose fibers, or synthetic fibers.
  • the media can be formed into blankets of varying thicknesses, fiber sizes, and densities or into fiber mats of random fiber size and density, which are then supported by a wire or cardboard frame 14.
  • dry fibrous filters may contain an electric charge. These filters contain fibers that are positively-charged, negatively-charged or both. They have the added benefit of capturing charged particles from the air stream. The subject invention does not interfere with the electrostatic properties of such a filter and is suitable for use on these filters as well.
  • a biocide is to be applied to the filter medium 12.
  • a biocide is understood to be any chemical agent capable of destroying living organisms and virii. Any of the following terms could be classified as a biocide: germicide, disinfectant, antibacterial solution, anti-mold solution, antifungal solution and anti-spore solution.
  • Typical chemical compositions which would act as a biocide for the purpose of this invention are alkyl dimethyl benzyl ammonium sacharinate, Quaternary ammonium chlorides, Triclosan, and phenylphenol.
  • a core material 18 is microencapsulated when natural and/or man-made (synthetic) materials are used to initiate a polymerization reaction that envelops the core material 18 and forms a shell 20 around the entire core material 18, which is usually roughly spherical in shape.
  • the shell wall 20 is porous so that over time the core material 18 is released by mass diffusion. The porous nature of time-released microcapsules is controlled during polymerization and is varied according to the desired amount and time the core material 18 is to be released from the shell 20.
  • the core material 18 should be a viscous solvent with properties such that its time release profile can be controlled and be easily engineered to produce the desired release profile i.e.; amount released over a desired time period. It should also coat the fibers of the filter media and have the properties of trapping particles by viscous impingement.
  • the viscous solvent can be selected from any of a number of naturally occurring oils from vegetables, nuts or other plants. It may also be a synthetic product, or a combination of natural and synthetic materials.
  • the material used as a solvent for the afore-mentioned biocide can be any one of the following: almond oil, soybean oil, peanut oil, olive oil, linseed oil, corn oil, vegetable oil, any and all cooking oils, lanolin, glycerine, triethanolomine, ethyl alcohol, tallow, fatty acids (i.e. oleic, linoleic, palmitic, myristic, stearic, and arachidic acids), water, and organic solvents.
  • the dry, free-flowing microcapsules 16 can be applied to the filter medium 12 in many ways depending on the type of filter medium used.
  • the filter medium is coated with an adhesive base.
  • This adhesive base may be a naturally occurring substance such as gum or latex, a synthetic material such as a polymeric compound, or a combination of natural and synthetic adhesives.
  • the microcapsules are then spread, sprayed, or otherwise applied in a uniform manner on the coated filter medium. Drying time of the adhesive may be accelerated by passing heated air across or through the filter. Additionally, a radiant heat source, such as a heat lamp, may be used as an alternative method for shortening the drying time. In the case of a viscous impingement type medium, no additional adhesive material is to be applied since the viscous substance will retain the microcapsules.
  • the intake side of the filter is coated with the biocide. As an option, the exhaust side may also be located for increased protection.
  • the invention will be a water based slurry with a microcapsule concentration of 25% to 35% by weight.
  • the slurry will also contain an adhesive that constitutes between 1% and 5% by weight of the total slurry.
  • This adhesive can be a natural product such gum arabic or a synthetic polymeric adhesive.
  • This slurry is easily atomized and sprayed onto a filter medium. Additionally, the slurry may be brushed, rolled or otherwise similarly applied to the filter medium 12. It is easy to adapt this technique for use on a wide range of filter media such as, but not limited to, pure synthetics, such as polyester, natural media, such as a cotton weave, or a combination of natural and synthetic filter media.
  • Incorporated into the core material 18 is an antimicrobial agent with a concentration between 0.5% to 5% by weight depending upon the particular antimicrobial agent selected.
  • the most desirable property of the chosen antimicrobial agent is the ability to destroy a wide variety of pathogens and microorganisms that pose a health hazard to humans.
  • Industry has provided a number of compounds that may be used as an antimicrobial agent.
  • One such compound is n-alkyl (50% C14, 40% C12, 10%C16) dimethyl benzyl ammonium saccharinate and is particularly effective as a broad spectrum biocide.
  • other quaternary ammonium salts may be used.
  • biocidal agents include Triclosan, o-Benzyl p- chlorophenol, 2-phenylphenol or N-Alkyl N-Ethyl Morpholinium Sulphates, any of which may be used as the antimicrobial agent.
  • Tables l-IV show the effectiveness of a preferred embodiment of the subject invention against certain pathogens.
  • a coating containing 25% to 35% by weight of the microcapsules was uniformly applied to a filter, and an untreated filter was used for comparison. Both the treated and untreated filters were inoculated with the test organisms. At specific time intervals, the test organisms were eluted from the samples in known amounts of neutralizing solution. The number of bacteria present in this liquid was determined, and the percentage reduction was calculated. All three qualitative tests were performed by a certified laboratory using the American Association of Textile Chemists and Colorists Test Method 100-1999: Antibacterial Finishes on Textile Materials. Table I shows the percent reduction of S aureus bacteria as time elapses.
  • test filter was inoculated by nebulizing a suspension of the test organism into the 52.2 test rig for at least twenty minutes. Following inoculation, the filter was removed from the test rig, cut into pieces and replicate pieces placed into one of the static chambers maintained at 94% relative humidity.
  • the samples from day 0 show a mean of 1 ,820 CFUs and represents the initial level of inoculation. After one month, none of the samples had any measurable CFUs. This is an expected result for this type of test and is not indicative of antimicrobial activity. (350 is the minimum number of CFUs detectable). After two months, 60% of the sample pieces showed no detectable growth while 7 out of 15 samples showed no detectable growth after three months. Due to imprecise application, the test filter was not uniformly treated with the biocidal agent. Therefore, some filter pieces showed no effectiveness at inhibiting growth of the test organism. Previous tests of filters had varied, including areas of little growth, but did not exhibit areas of no detectable growth as in the test of the subject invention.
  • the time release microcapsules should be sized between range of 50 ⁇ m and 500 ⁇ m depending on the desired release profile of the core material.
  • Microencapsulation is a well known technique and a multitude of techniques can easily be found in the literature. Any microencapsulation method that provides for the time release of its core material with the desired release profile may be used. A steady and constant release of the core contents over 3 to 6 months is preferred.
  • the quantity and size of the microcapsules will vary considerably. They may be applied to both surfaces of the filter medium or to different layers of filter medium.
  • a second non-coated layer 24 of filter medium will be attached to rear of the initially coated filter 12 to catch any excess dirt, residue or microcapsules which may escape from the first filter layer 12.
  • the second filter layer may be from 1/32 of an inch to several inches from the initial layer and additional layers may be added as required by the intended usage.
  • the treated filter After assembly, the treated filter will be placed in an airtight package with an internal pressure slightly greater that atmospheric pressure. This prevents the biocide from diffusing out of the microcapsules and ensures a stable shelf-life making the product easier to store and ship. Prior to installing a treated filter into an HVAC system, the airtight package is opened and the biocide will begin to diffuse thereby activating the treated filter.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Filtering Materials (AREA)
  • Manufacturing Of Micro-Capsules (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)

Abstract

L'invention concerne un filtre à air amélioré qui permet d'éliminer et de détruire les pathogènes nuisibles dans le flux d'air d'un système de chauffage, ventilation, climatisation (CVC). Ce filtre à air contient des fibres naturelles, synthétiques ou une combinaison de fibres naturelles et synthétiques tissées de manière à piéger les matières particulaires. Des microcapsules contenant un biocide adéquat destiné à désinfecter et/ou à désodoriser l'air de sortie sont intercalées avec les fibres. Le biocide choisi est microencapsulé afin d'assurer un taux de diffusion uniforme du biocide pendant la durée de vie utile du filtre. L'invention concerne également le procédé permettant de préparer les microcapsules à incorporer au filtre, en utilisant des agents de désinfection à large spectre facilement utilisables.
PCT/US2001/047809 2000-12-18 2001-12-10 Filtre a air avec biocides microencapsules Ceased WO2002058812A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002248174A AU2002248174A1 (en) 2000-12-18 2001-12-10 Air filter with microencapsulated biocides

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US25643700P 2000-12-18 2000-12-18
US60/256,437 2000-12-18

Publications (2)

Publication Number Publication Date
WO2002058812A2 true WO2002058812A2 (fr) 2002-08-01
WO2002058812A3 WO2002058812A3 (fr) 2002-10-03

Family

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Application Number Title Priority Date Filing Date
PCT/US2001/047809 Ceased WO2002058812A2 (fr) 2000-12-18 2001-12-10 Filtre a air avec biocides microencapsules

Country Status (2)

Country Link
AU (1) AU2002248174A1 (fr)
WO (1) WO2002058812A2 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6872241B2 (en) 2001-10-19 2005-03-29 Innovative Construction And Building Materials, Llc Anti-pathogenic air filtration media and air handling devices having protective capabilities against infectious airborne mircoorganisms
WO2006015329A1 (fr) * 2004-07-30 2006-02-09 Eastman Chemical Company Filtre à air antimicrobien
WO2007062471A1 (fr) * 2005-11-30 2007-06-07 Alpha Technologies Corporation Ltd Compositions de traitement à l’air et appareils à cet effet
WO2007087883A1 (fr) * 2006-01-11 2007-08-09 P & W Invest Vermögensverwaltungsgesellschaft mbH Membrane d'enveloppe destinée à libérer un agent encapsulé, procédé de fabrication et utilisation
US7892333B2 (en) * 2004-07-01 2011-02-22 Valeo Systemes Thermiques S.A.S. Air treatment device used in a particle filter or a combined filter for a heating, ventilation and/or air conditioning installation for a vehicle cabin
WO2012123446A1 (fr) 2011-03-15 2012-09-20 Glaxo Group Limited Matériau filtrant et masque de protection contre des pathogènes
WO2013019920A3 (fr) * 2011-08-03 2013-07-11 Src, Inc. Moyen de filtration à microcapsule de décontamination active
DE102012005380A1 (de) * 2012-03-16 2013-09-19 Daimler Ag Filtermedium
CN111944348A (zh) * 2019-05-15 2020-11-17 香港科技大学 离子液体基涂料及其制备方法以及具有离子液体基涂层的制品的制造方法
WO2022093620A1 (fr) * 2020-10-29 2022-05-05 Industrial Polymers and Chemicals, Inc. Filtre à air avec surveillance et inactivation de pathogènes
US11678703B2 (en) 2020-07-30 2023-06-20 Fxi Inc. Limited Coated substrates and articles with anti-viral properties, and fabrication processes

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112023537B (zh) * 2019-06-03 2024-01-30 东华大学 一种袋式除尘器滤料加工方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4514461A (en) * 1981-08-10 1985-04-30 Woo Yen Kong Fragrance impregnated fabric
US5098621A (en) * 1985-01-07 1992-03-24 Twin Rivers Engineering Method of forming a foam substrate and micropackaged active ingredient particle composite
US5156843A (en) * 1989-03-20 1992-10-20 Advanced Polymer Systems, Inc. Fabric impregnated with functional substances for controlled release
US5104427A (en) * 1990-01-25 1992-04-14 Riley Michael D Process for maximizing effectiveness of active ingredients on a filter substrate for dispersing
US5192342A (en) * 1992-04-15 1993-03-09 Baron Robert A Apparatus for enhancing the environmental quality of work spaces
US5444094A (en) * 1993-08-24 1995-08-22 Stepan Company Methods and compositions for disinfecting surfaces containing tuberculosis causing bacteria
JPH11226326A (ja) * 1998-02-16 1999-08-24 Toshiba Corp フィルター、及び空気清浄装置

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6872241B2 (en) 2001-10-19 2005-03-29 Innovative Construction And Building Materials, Llc Anti-pathogenic air filtration media and air handling devices having protective capabilities against infectious airborne mircoorganisms
US7892333B2 (en) * 2004-07-01 2011-02-22 Valeo Systemes Thermiques S.A.S. Air treatment device used in a particle filter or a combined filter for a heating, ventilation and/or air conditioning installation for a vehicle cabin
WO2006015329A1 (fr) * 2004-07-30 2006-02-09 Eastman Chemical Company Filtre à air antimicrobien
WO2007062471A1 (fr) * 2005-11-30 2007-06-07 Alpha Technologies Corporation Ltd Compositions de traitement à l’air et appareils à cet effet
WO2007087883A1 (fr) * 2006-01-11 2007-08-09 P & W Invest Vermögensverwaltungsgesellschaft mbH Membrane d'enveloppe destinée à libérer un agent encapsulé, procédé de fabrication et utilisation
JP2009523714A (ja) * 2006-01-11 2009-06-25 ペー・ウント・ヴェー・インヴェスト・フェアメーゲンス・フェアヴァルトゥングスゲゼルシャフト・エム・ベー・ハー 封入された薬剤を放出するための被包膜、その製造方法、およびその使用方法
WO2012123446A1 (fr) 2011-03-15 2012-09-20 Glaxo Group Limited Matériau filtrant et masque de protection contre des pathogènes
WO2013019920A3 (fr) * 2011-08-03 2013-07-11 Src, Inc. Moyen de filtration à microcapsule de décontamination active
DE102012005380A1 (de) * 2012-03-16 2013-09-19 Daimler Ag Filtermedium
CN111944348A (zh) * 2019-05-15 2020-11-17 香港科技大学 离子液体基涂料及其制备方法以及具有离子液体基涂层的制品的制造方法
EP3739006A1 (fr) * 2019-05-15 2020-11-18 The Hong Kong University of Science and Technology Revêtement à base de liquide ionique et procédé de fabrication d'articles ainsi revêtus
CN111944348B (zh) * 2019-05-15 2022-09-02 香港科技大学 离子液体基涂料及其制备方法以及具有离子液体基涂层的制品的制造方法
US11678703B2 (en) 2020-07-30 2023-06-20 Fxi Inc. Limited Coated substrates and articles with anti-viral properties, and fabrication processes
US11930867B2 (en) 2020-07-30 2024-03-19 Fxi Inc. Limited Coated substrates and articles with anti-viral properties, and fabrication processes
WO2022093620A1 (fr) * 2020-10-29 2022-05-05 Industrial Polymers and Chemicals, Inc. Filtre à air avec surveillance et inactivation de pathogènes
US11766040B2 (en) 2020-10-29 2023-09-26 Industrial Polymers and Chemicals, Inc. Air filter with pathogen monitoring and inactivation
US11793194B2 (en) 2020-10-29 2023-10-24 Industrial Polymers and Chemicals, Inc. Air filter with pathogen monitoring and inactivation

Also Published As

Publication number Publication date
AU2002248174A1 (en) 2002-08-06
WO2002058812A3 (fr) 2002-10-03

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