# US 11,955,258 B2 · Laminate of conductor and insulating coating, coil, rotating electric machine, insulating paint, and insulating film > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,955,258 B2 - Document ID: US11955258B2 - Status: Granted - Kind: B2 - Application number: 17/250,771 - Filed: 2019-03-27 - Published: 2021-07-01 - Granted: 2024-04-09 - Earliest claimed: 2018-09-03 - Assignees: Sumitomo Seika Chemicals Co., Ltd.; Hide Technology, LLC - Applicants: Sumitomo Seika Chemicals Co., Ltd.; Hide Technology, LLC - Inventors: Noriyuki Hayashizaka; Seiji Bando; Hideyuki Kikuchi - Web page: https://patentgrep.com/patent/US11955258B2 ## CPC - H01B 3/306: {Polyimides or polyesterimides} - H01B 7/0216: {Two layers} - C09D 7/61: inorganic - C09D 179/08: Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors - H01B 3/302: {Polyurethanes or polythiourethanes; Polyurea or polythiourea} - H01B 3/308: {Wires with resins} - H01B 3/421: {Polyesters} - H01F 5/06: Insulation of windings - C08K 3/22: of metals - C08K 2003/2227: {of aluminium} - H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K}) - C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D) - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) ## Abstract There is provided a laminate having excellent partial discharge resistance. A laminate of a conductor and an insulating coating comprising a conductor and an insulating coating formed on the conductor, wherein the insulating coating is formed of a resin composition containing a metal oxide hydrate, and an inorganic insulating layer is formed on the insulating coating when the laminate is exposed to partial discharge caused by inverter surges. ## Claims ### Claim 1 A laminate comprising at least a conductor, an insulating coating, a composite layer and an inorganic insulating layer, wherein: the insulating coating is formed of a resin composition containing a metal oxide hydrate, the resin composition contains the metal oxide hydrate in an amount of 6 to 50 parts by mass per 100 parts by mass of the resin, wherein the metal oxide hydrate is in a shape of flat fine particles having a high aspect ratio (one side/thickness) of 4 to 200, the resin in the resin composition is at least one selected from the group consisting of a polyamide-imide, a polyimide, and precursors thereof, the inorganic insulating layer is formed on the insulating coating when the laminate is exposed to partial discharge caused by inverter surges occurring due to switching at a frequency of 1 to 100 kHz, and the composite layer is also formed between the conductor and the inorganic insulating layer, wherein a thickness of the inorganic insulating layer is 10 nm or more and wherein a void ratio of the inorganic insulating layer is lower than 20%, and the composite layer contains a mixture of the resin and the metal oxide hydrate contained in the insulating coating, and a metal oxide or a metal oxide hydrate formed by dehydration of the metal oxide hydrate contained in the inorganic insulating layer, wherein the composite layer contains voids that are formed upon elimination of a portion of the resin from the composite layer by the partial discharge, wherein a void ratio of the composite layer is 20% or more. ### Claim 2 (depends on 1) The laminate according to claim 1, wherein the metal oxide hydrate is a hydrated alumina. ### Claim 3 (depends on 1) The laminate according to claim 1, wherein the inorganic insulating layer is formed of at least one of a metal oxide and a metal oxide hydrate formed by partial dehydration of the metal oxide hydrate. ### Claim 4 (depends on 1) The laminate according to claim 1, wherein the composite layer has a thickness of 10 nm or more. ### Claim 5 (depends on 1) The laminate according to claim 1, wherein the laminate is in the form of an insulated electric wire or a film. ### Claim 6 (depends on 5) A coil comprising the insulated electric wire according to claim 5. ### Claim 7 (depends on 5) A rotating electric machine comprising the insulated electric wire according to claim 5. ### Claim 8 (depends on 1) An insulating paint comprising the resin composition, for producing the laminate according to claim 1. ### Claim 9 (depends on 1) An insulating film formed from the resin composition, for forming the insulating coating of the laminate according to claim 1. ### Claim 10 (depends on 1) The laminate according to claim 1, wherein the resin composition contains the metal oxide hydrate in an amount of 10 to 50 parts by mass per 100 parts by mass of the resin.