ELECTRICALLY CONDUCTIVE PTC INK WITH DOUBLE SWITCHING TEMPERATURES AND APPLICATIONS THEREOF IN FLEXIBLE DOUBLE-SWITCHING HEATERS

• Main Authors: Xiao, Shuyong, Sisler, Lee M, Abbott, Richard C
• Format: Patent
• Language: English
• Published: 06.05.2021
• Subjects: ACCESSORIES; ADHESIVES; BASIC ELECTRIC ELEMENTS; BLASTING; BUILDING; BUILDING MATERIALS; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; COMBINED HEATING AND REFRIGERATION SYSTEMS; CORRECTING FLUIDS; DYES; ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; FILLING PASTES; FIXED CONSTRUCTIONS; HEAT PUMP SYSTEMS; HEATING; HUMAN NECESSITIES; INKS; LIGHTING; LIQUEFACTION SOLIDIFICATION OF GASES; MANUFACTURE OR STORAGE OF ICE; MECHANICAL ENGINEERING; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; OUTERWEAR; PAINTS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; POLISHES; PRODUCING, WORKING OR HANDLING ICE; PROTECTIVE GARMENTS; REFRIGERATION OR COOLING; RESISTORS; STRUCTURAL ELEMENTS; USE OF MATERIALS THEREFOR; WEAPONS; WEARING APPAREL; WOODSTAINS

An article comprising a double-switching heater that comprises a double-switching PTC ink deposited on a flexible substrate to form one or more resistors. The double-switching PTC ink comprises a first resin and a second resin; the first resin provides a first PTC effect within a first temperature range (T1, T2); the second resin provides a second PTC effect within a second temperature range (T3, T4), where T3≥T2; the first resin has an NTC effect above the first temperature range; the second PTC effect is greater than the first PTC effect; and the second PTC effect overlaps with, and is greater than, the NTC effect of the first resin. The substrate can be either thermal polyurethane, nylon or a polyester blend.