# US 10,479,857 B2 · Storage-stable impregnating resins and electrical insulating tapes > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,479,857 B2 - Document ID: US10479857B2 - Status: Granted - Kind: B2 - Application number: 15/571,119 - Filed: 2016-04-14 - Published: 2018-06-21 - Granted: 2019-11-19 - Earliest claimed: 2015-05-08 - Assignees: Siemens Aktiengesellschaft - Applicants: Siemens Aktiengesellschaft - Inventors: Peter Gröppel; Michael Nagel; Mario Brockschmidt; Regina Mühlberg; Friedhelm Pohlmann; Roland Röding; Manuel Weil - Web page: https://patentgrep.com/patent/US10479857B2 ## CPC - C08G 59/4021: {Ureas; Thioureas; Guanidines; Dicyandiamides} - C08G 59/50: Amines - C08K 3/22: of metals - C08K 3/28: Nitrogen-containing compounds - C08K 3/34: Silicon-containing compounds - C08K 3/36: Silica - C08L 63/00: Compositions of epoxy resins; Compositions of derivatives of epoxy resins - H01B 3/40: epoxy resins - C08K 2003/221: {of rare earth metal} - C08K 2003/2227: {of aluminium} - C08K 2003/2237: {of titanium} - C08K 2201/011: Nanostructured additives - C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - 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}) ## Abstract An anhydride-free impregnating resin for an electrical insulation body, the impregnating resin has an epoxy resin, a curing agent and nanoscale and/or microscale inorganic particles. An impregnable electrical insulating tape for an electrical insulation body has a curing agent applied to the electrical insulating tape. A method includes producing an electrical insulation body An electrical insulation body includes an anhydride-free impregnating resin, where the impregnating resin has an epoxy resin, a curing agent and nanoscale and/or microscale inorganic particles. ## Claims ### Claim 1 An anhydride-free impregnating resin for an electrical insulation body, wherein the impregnating resin comprises: an epoxy resin, a hardener and nanosize and/or microsize inorganic particles, wherein the hardener is selected from the group consisting of a substituted guanidine, an aromatic diamine, an N-acylimidazole, a metal salt complex of an imidazole, a carboxylic hydrazide, a triazine derivative, melamine, a melamine derivative, a cyanoacetyl compound, an N-cyanoacylamide compound, an acylthiopropylphenol, a urea derivative, an aliphatic diamine, a cycloaliphatic diamine, an aliphatic polyamine, a cycloaliphatic polyamine and mixtures thereof, wherein the hardener is suspended in a solid state in the epoxy resin. ### Claim 2 (depends on 1) The impregnating resin as claimed in claim 1, wherein the substituted guanidine is dicyandiamide. ### Claim 3 (depends on 1) The impregnating resin as claimed in claim 1, wherein the hardener is suspended in the form of particles in the epoxy resin. ### Claim 4 (depends on 1) The impregnating resin as claimed in claim 1, wherein the hardener is present in an amount of 1% by weight-15% by weight based on the epoxy resin. ### Claim 5 (depends on 1) The impregnating resin as claimed in claim 1, wherein the inorganic particles comprise aluminum oxide, aluminum hydroxide, silicon dioxide, titanium dioxide, rare earth oxide, alkali metal oxide, metal nitride and/or sheet silicates, in particular exfoliated or partially exfoliated sheet silicates. ### Claim 6 (depends on 1) The impregnating resin as claimed in claim 1, wherein the inorganic particles are present in an amount of 15% by weight-25% by weight based on the epoxy resin. ### Claim 7 (depends on 3) The impregnating resin as claimed in claim 3, wherein the hardener is suspended in the form of particles having a particle size of 1 μm-100 μm in the epoxy resin. ### Claim 8 (depends on 4) The impregnating resin as claimed in claim 4, wherein the hardener is present in an amount of 4% by weight-10% by weight based on the epoxy resin. ### Claim 9 (depends on 6) The impregnating resin as claimed in claim 6, wherein the inorganic particles are present in an amount of 17% by weight based on the epoxy resin. ### Claim 10 An impregnatable electrical insulation tape for an electrical insulation body, comprising: a hardener in a solid state applied to the electrical insulation tape. ### Claim 11 (depends on 10) The electrical insulation tape as claimed in claim 10, wherein the hardener has been applied to a first side of the electrical insulation tape and a catalyst has been applied to a second side of the electrical insulation tape which faces away from the first side. ### Claim 12 (depends on 11) The electrical insulation tape as claimed in claim 11, wherein the catalyst is selected from the group consisting of zinc naphthenate, cobalt naphthenate, zinc octoate, cobalt octoate, an imidazole, a tertiary amine, an aluminum trisalkylacetoacetate, aluminum trisacetylacetonate, aluminum alkoxide, aluminum acylate, a tetralkylammonium benzoate and mixtures thereof. ### Claim 13 (depends on 10) The electrical insulation tape as claimed in claim 10, wherein the hardener is selected from the group consisting of a substituted guanidine, an aromatic diamine, an N-acylimidazole, a metal salt complex of an imidazole, a carboxylic hydrazide, a triazine derivative, melamine, a melamine derivative, a cyanoacetyl compound, an N-cyanoacylamide compound, an acylthiopropylphenol, a urea derivative, an aliphatic diamine, a cycloaliphatic diamine, an aliphatic polyamine, a cycloaliphatic polyamine and mixtures thereof. ### Claim 14 (depends on 10) The impregnatable electrical insulation tape of claim 10, further comprising a hardener-free liquid resin impregnated into the impregnatable electrical insulation tape, forming a solid/liquid two-phase system of hardener/resin in the impregnatable electrical insulation tape. ### Claim 15 A process for producing an electrical insulation body, comprising: a1) wrapping an electrical insulation tape around an electrical conductor, b) impregnating the electrical insulation tape of step a1) with an impregnating resin to form a solid/liquid two-phase system of hardener/resin in the electrical insulation tape; and c) curing the impregnating resin. ### Claim 16 (depends on 15) The process as claimed in claim 15, further comprising: a2) mixing the epoxy resin with the inorganic particles; wherein the impregnating resin is produced in step b) by contacting the mixture from step a2) with the electrical insulation tape from step a1). ### Claim 17 (depends on 15) The process of claim 15, further comprising: prior to step a1), applying the hardener to the electrical insulation tape, and impregnating the electrical insulation tape in step b) with a hardener-free impregnating resin. ### Claim 18 (depends on 17) The process of claim 17, further comprising: applying the hardener to the electrical insulation tape in a liquid state, and allowing the hardener to transform to a solid state prior to step a1).