# US 2025/0095891 A1 · Composition and injection molded product > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0095891 A1 - Document ID: US20250095891A1 - Status: Published application - Kind: A1 - Application number: 18/728,008 - Filed: 2022-12-20 - Published: 2025-03-20 - Earliest claimed: 2022-01-24 - Assignees: Tokin Corporation - Applicants: TOKIN Corporation - Inventors: Hidenori TAKAHASHI - Web page: https://patentgrep.com/patent/US20250095891A1 ## CPC - H01F 1/14766: {Fe-Si based alloys} - C08K 3/01: characterized by their specific function - C08K 3/08: Metals - C08K 9/00: Use of pretreated ingredients - C08K 9/02: Ingredients treated with inorganic substances - C08K 9/06: with silicon-containing compounds - C08L 77/00: Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain (of polyhydrazides C08L79/06; of polyamideimides or polyamide acids C08L79/08); Compositions of derivatives of such polymers - C08L 77/06: Polyamides derived from polyamines and polycarboxylic acids (C08L77/10 takes precedence) - C08L 101/00: Compositions of unspecified macromolecular compounds - H01F 1/147: Alloys characterised by their composition {(treatment thereof for enhancing their electromagnetic properties C21D8/12)} - H01F 1/153: Amorphous metallic alloys, e.g. glassy metals {(making ferrous amorphous alloys C22C33/003)} - H01F 1/15308: {based on Fe/Ni (H01F1/15325 takes precedence)} - H01F 1/26: by macromolecular organic substances - C08K 2201/003: Additives being defined by their diameter - C08K 2201/01: Magnetic additives - C08K 2201/011: Nanostructured additives - 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) - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) ## Abstract A composition suitable for injection molding, from which a molded product excellent in magnetic properties may be obtained, and an injection molded product excellent in magnetic properties are provided. A composition includes a magnetic powder and a thermoplastic resin, at least a part of the magnetic powder having a coating layer. ## Claims ### Claim 1 A composition comprising: a magnetic powder and a thermoplastic resin, wherein at least a part of the magnetic powder has a coating layer. ### Claim 2 (depends on 1) The composition according to claim 1, wherein the coating layer comprises one or more selected from a glass, a silicone resin, and a coupling agent. ### Claim 3 (depends on 1) The composition according to claim 1, wherein the coating layer comprises one or more selected from a glass and a silicone resin. ### Claim 4 (depends on 1) The composition according to claim 1, wherein the coating layer comprises a coupling agent. ### Claim 5 (depends on 1) The composition according to claim 1, wherein the coating layer comprises a first layer comprising one or more selected from a glass and a silicone resin, and a second layer comprising a coupling agent. ### Claim 6 (depends on 1) The composition according to claim 1, wherein the magnetic powder comprises an Fe-based nanocrystalline alloy. ### Claim 7 (depends on 1) The composition according to claim 1, wherein the magnetic powder comprises an Fe—Si alloy. ### Claim 8 (depends on 1) The composition according to claim 1, wherein the magnetic powder comprises a first magnetic powder having a median diameter of 1 to 50 μm and a second magnetic powder having a median diameter of 10 to 300 μm, and the median diameter of the second magnetic powder is larger than the median diameter of the first magnetic powder. ### Claim 9 (depends on 8) The composition according to claim 8, wherein the first magnetic powder is an Fe-based nanocrystalline alloy, and the second magnetic powder is an Fe—Si alloy. ### Claim 10 (depends on 8) The composition according to claim 8, having a mass ratio between the first magnetic powder and the second magnetic powder of 95:5 to 50:50. ### Claim 11 (depends on 2) The composition according to claim 2, wherein the glass comprises a phosphate glass. ### Claim 12 (depends on 1) The composition according to claim 1, having a melt flow rate of 80 g/10 minutes or more at 330° C. ### Claim 13 (depends on 1) The composition according to claim 1, for injection molding. ### Claim 14 (depends on 1) An injection molded product of the composition according to any one of claim 1. ### Claim 15 (depends on 14) The injection molded product according to claim 14, having a core loss of 350 kW/m3 or less measured under conditions at a frequency of 20 kHz and an applied magnetic flux density of 100 mT. ### Claim 16 (depends on 14) The injection molded product according to claim 14, having a core loss of 2800 kW/m3 or less measured under conditions at a frequency of 100 kHz and an applied magnetic flux density of 100 mT. ### Claim 17 (depends on 14) The injection molded product according to claim 14, having a magnetic permeability retention rate of 83% or more at a frequency of 100 kHz and a magnetic field strength of 8 kA/m. ### Claim 18 (depends on 14) The injection molded product according to claim 14, having a radial crushing strength of 40 MPa or more. ### Claim 19 (depends on 14) The injection molded product according to claim 14, having a resistance value of 1×1013Ω or more.