# US 10,501,333 B2 · Spherical ferrite powder, resin compound including spherical ferrite powder, and molded product made of resin compound

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- Number: US 10,501,333 B2
- Document ID: US10501333B2
- Status: Granted
- Kind: B2
- Application number: 15/511,492
- Filed: 2015-08-31
- Published: 2018-06-28
- Granted: 2019-12-10
- Earliest claimed: 2014-09-19
- Assignees: Powdertech Co., Ltd.; Tatsuta Electric Wire & Cable Co., Ltd.
- Applicants: Powdertech Co., Ltd.; Tatsuta Electric Wire & Cable Co., Ltd.
- Inventors: Koji Aga; Tetsuya Igarashi; Akio Takahashi
- Web page: https://patentgrep.com/patent/US10501333B2

## CPC

- C01G 49/0072: {containing manganese}
- C08K 3/22: of metals
- C08K 9/04: Ingredients treated with organic substances {(treated with macromolecular compounds C08K9/08)}
- C08L 101/00: Compositions of unspecified macromolecular compounds
- C09C 1/22: Compounds of iron {(C09C1/0009, C09C1/0015, C09C1/0078 take precedence)}
- C09C 1/24: Oxides of iron
- H01F 1/00: Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F 1/37: in a bonding agent
- C01P 2002/50: Solid solutions
- C01P 2004/32: Spheres
- C01P 2004/51: Particles with a specific particle size distribution
- C01P 2004/61: Micrometer sized, i.e. from 1-100 micrometer
- C01P 2006/12: Surface area
- C01P 2006/42: Magnetic properties
- C08K 2003/2265: {of iron}
- C01G: COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts or peroxyacids C01B15/00; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium, or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds containing nitrogen, other non-metals and metal C01B21/082}; metal amides C01B21/092; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanamide C01C3/16; thiocyanates C01C3/20)
- 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)
- C09C: TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES (treatment of materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone C04B14/00, C04B18/00, C04B20/00); PREPARATION OF CARBON BLACK {; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS}
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

## Abstract

The present invention provides a spherical ferrite powder that is excellent in filling ability and moldability if used as a filler, is excellent in handling ability, and is high in resistivity; a resin compound including the ferrite powder; and a molded product made of the resin compound. The spherical ferrite powder including 15 to 30 wt % of ferrite particles having the particle diameter less than 11 μm and have the volume average particle diameter of 10 to 50 μm; the resin compound including the ferrite powder; and the molded product made of the resin compound are employed.

## Claims

### Claim 1

A spherical ferrite powder comprising a mixture of:
spherical ferrite particles having a particle diameter of less than 11 μm; and
spherical ferrite particles having a particle diameter of 11 μm or more;
wherein:
the spherical ferrite particles having a particle diameter of less than 11 μm have a BET specific surface area of 2 to 50 m2/g;
the spherical ferrite particles having a particle diameter of 11 μm or more have a BET specific surface area of 0.1 to 2 m2/g;
an amount of the spherical ferrite particles having a particle diameter of less than 11 μm present in the mixture is 15 to 30 wt % of a total weight of the mixture; and
a volume average particle diameter of the mixture of spherical ferrite particles is 10 to 50 μm.

### Claim 2 (depends on 1)

The spherical ferrite powder according to claim 1, wherein the ferrite particles having the particle diameter of 11 μm or more are coated with a resin.

### Claim 3 (depends on 2)

A resin compound including 50 to 99.5 wt % of the spherical ferrite powder according to claim 2.

### Claim 4 (depends on 3)

A molded product formed by molding the resin compound according to claim 3.

### Claim 5 (depends on 1)

A resin compound including 50 to 99.5 wt % of the spherical ferrite powder according to claim 1.

### Claim 6 (depends on 5)

A molded product formed by molding the resin compound according to claim 5.