# US 5,707,739 A · Powdered biocidal compositions > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,707,739 A - Document ID: US5707739A - Status: Granted - Kind: A - Application number: 08/465,086 - Filed: 1995-06-05 - Granted: 1998-01-13 - Earliest claimed: 1995-06-05 - Assignees: Southwest Research Institute - Inventors: Stephen T. Wellinghoff; Joel J. Kampa; Darren E. Barlow - Web page: https://patentgrep.com/patent/US5707739A ## CPC - C01B 11/024: {from chlorites} - A01N 59/00: Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds - A23B 9/14: Coating with a protective layer; Compositions or apparatus therefor - A23B 9/30: Inorganic compounds - C01B 11/022: {Chlorine dioxide (ClO2)} - Y10T 428/2991: Coated - Y10T 428/2998: including synthetic resin or polymer - C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C} - A01N: PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF (preservation of food or foodstuff A23); BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES (preparations for medical, dental or toiletry purposes which kill or prevent the growth or proliferation of unwanted organisms A61K); PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS - A23B: PRESERVATION OF FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES; CHEMICAL RIPENING OF FRUIT OR VEGETABLES - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A biocidal powder for sustained release of chlorine dioxide includes particles containing chlorite anions, and a hydrophobic core having the particles on a surface thereof, the hydrophobic core containing an acid releasing agent. The particles and the hydrophobic core are substantially free of water, and the particles are capable of releasing chlorine dioxide upon hydrolysis of the acid releasing agent. ## Claims ### Claim 1 A biocidal and deodorizing powder for sustained release of chlorine dioxide comprising: particles containing chlorite anions; and a hydrophobic core having said particles on a surface thereof, the hydrophobic core containing an acid releasing agent, said particles and said hydrophobic core being substantially free of water, said particles being capable of releasing chlorine dioxide upon hydrolysis of the acid releasing agent. ### Claim 2 (depends on 1) The powder of claim 1 further including anhydrous particles on the surface of the hydrophobic core. ### Claim 3 (depends on 2) The powder of claim 2 wherein the anhydrous particles comprise sodium sulfate, calcium sulfate, magnesium sulfate, or moisture depleted silica gel. ### Claim 4 (depends on 1) The powder of claim 1 wherein the particles contain an alkali metal chlorite or alkaline-earth metal chlorite; the hydrophobic core further comprises atactic polypropylene, hydrocarbon wax, chlorinated wax, polyethylene wax, polyolefin, polyester, a polyolefin copolymer, or mixtures thereof; and the acid releasing agent includes a carboxylic acid, an ester, an anhydride, an acyl halide, phosphoric acid, a phosphate ester, a trimethylsilyl phosphate ester, a dialkyl phosphate, sulfonic acid, a sulfonic acid ester, a sulfonic acid chloride, or a phosphosilane of a glycerol based ester. ### Claim 5 (depends on 4) The powder of claim 4 wherein the acid releasing agent is an acid releasing wax. ### Claim 6 (depends on 5) The powder of claim 5 wherein the acid releasing wax has the formula ##STR17## wherein G has the formula ##STR18## ### Claim 7 (depends on 4) The powder of claim 4 wherein the acid releasing wax is a phosphosilane of a glycerol based ester. ### Claim 8 (depends on 1) The powder of claim 1 wherein the particles contain an alkali metal chlorite, alkaline-earth metal chlorite, or a chlorite salt of a transition metal ion or a protonated primary, secondary, tertiary or quaternary amine. ### Claim 9 (depends on 8) The powder of claim 8 wherein the particles contain sodium chlorite, calcium chlorite or potassium chlorite. ### Claim 10 (depends on 1) The powder of claim 1 wherein the hydrophobic core further comprises atactic polypropylene, hydrocarbon wax, chlorinated wax, polyethylene wax, polyolefin, polyester, a polyolefin copolymer, or mixtures thereof. ### Claim 11 (depends on 1) The powder of claim 1 wherein the acid releasing agent includes a carboxylic acid, an ester, an anhydride, an acyl halide, phosphoric acid, a phosphate ester, a trimethylsilyl phosphate ester, a dialkyl phosphate, sulfonic acid, a sulfonic acid ester, a sulfonic acid chloride, or a phosphosilane of a glycerol based ester. ### Claim 12 (depends on 1) A method of retarding bacterial, fungal, and viral contamination and growth of molds on a surface and/or deodorizing the surface comprising treating the surface with a powder of claim 1, and exposing the treated surface to moisture to release chlorine dioxide from the powder into the atmosphere surrounding the surface. ### Claim 13 (depends on 1) A process for preparing a powder of claim 1, the process comprising: forming particles containing chlorite anions; and spraying a hydrophobic material containing an acid releasing agent onto a fluidized bed of the particles so as to form a powder having a core containing the hydrophobic material and a layer of the particles containing chlorite anions on a surface of the core. ### Claim 14 A biocidal and deodorizing powder for sustained release of chlorine dioxide comprising: particles comprising chlorite salt; and a hydrophobic core having said particles on a surface thereof, the hydrophobic core containing an acid releasing wax, said particles and said hydrophobic core being substantially free of water, said particles being capable of releasing chlorine dioxide upon hydrolysis of the acid releasing wax. ### Claim 15 (depends on 14) The powder of claim 14 further including anhydrous particles on the surface of the hydrophobic core. ### Claim 16 (depends on 15) The powder of claim 15 wherein the anhydrous particles comprise sodium sulfate, calcium sulfate, magnesium sulfate, or moisture depleted silica gel. ### Claim 17 (depends on 14) The powder of claim 14 wherein the acid releasing wax is a phosphosilane of a glycerol based ester. ### Claim 18 (depends on 17) The powder of claim 17 wherein the acid releasing wax has the formula ##STR19## wherein G has the formula ##STR20## ### Claim 19 (depends on 14) The powder of claim 14 wherein the particles contain an alkali metal chlorite, alkaline-earth metal chlorite, or a chlorite salt of a transition metal ion or a protonated primary, secondary, tertiary or quaternary amine. ### Claim 20 (depends on 19) The powder of claim 19 wherein the particles contain sodium chlorite, calcium chlorite or potassium chlorite. ### Claim 21 (depends on 14) The powder of claim 14 wherein the hydrophobic core further comprises atactic polypropylene, hydrocarbon wax, chlorinated wax, polyethylene wax, polyolefin, polyester, a polyolefin copolymer, or mixtures thereof. ### Claim 22 (depends on 14) A method of retarding bacterial, fungal, and viral contamination and growth of molds on a surface and/or deodorizing the surface comprising treating the surface with a powder of claim 14, and exposing the treated surface to moisture to release chlorine dioxide from the powder into the atmosphere surrounding the surface. ### Claim 23 (depends on 14) A process for preparing a powder of claim 14, the process comprising: forming particles containing chlorite salt; and spraying a hydrophobic material containing an acid releasing wax onto a fluidized bed of the particles so as to form a powder having a core containing the hydrophobic material and a layer of the particles containing chlorite salt on a surface of the core.