# US 11,306,207 B2 · Powder mixture

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- Number: US 11,306,207 B2
- Document ID: US11306207B2
- Status: Granted
- Kind: B2
- Application number: 16/500,042
- Filed: 2018-03-30
- Published: 2020-06-11
- Granted: 2022-04-19
- Earliest claimed: 2017-04-04
- Assignees: Denka Company Limited
- Applicants: Denka Company Limited
- Inventors: Shuji Sasaki; Yuzo Nakamura; Kohki Ichikawa
- Web page: https://patentgrep.com/patent/US11306207B2

## CPC

- C09C 1/0081: {Composite particulate pigments or fillers, i.e. containing at least two solid phases, except those consisting of coated particles of one compound (C09C1/0015, C09C1/0078 take precedence)}
- C08K 3/22: of metals
- C08K 3/36: Silica
- C08K 7/18: inorganic
- H01L 23/295
- C01P 2004/32: Spheres
- C01P 2004/61: Micrometer sized, i.e. from 1-100 micrometer
- C01P 2004/62: Submicrometer sized, i.e. from 0.1-1 micrometer
- C08K 2003/2227: {of aluminium}
- C08K 2003/2237: {of titanium}
- C08K 2201/005: Additives being defined by their particle size in general
- C08K 2201/014: Additives containing two or more different additives of the same subgroup in C08K
- 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}
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- H01L
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

## Abstract

A powder mixture including spherical barium titanate particles and spherical oxide particles and having an average particle diameter of 2 μm or more and 30 μm or less, wherein the spherical oxide particles have an average particle diameter of 0.05 μm or more and 1.5 μm or less, and the spherical oxide particles are contained in an amount of 0.02% by mass or more and 15% by mass or less based on the powder mixture. The spherical oxide particles are preferably amorphous silicon dioxide particles and/or aluminum oxide particles. According to the present invention, it is possible to provide a spherical barium titanate-based powder which enables to prepare a high dielectric resin composition with which reduced wire sweep amount and burr are achieved.

## Claims

### Claim 1

A powder mixture comprising spherical barium titanate particles and spherical amorphous silicon dioxide particles, the powder mixture having an average particle diameter of 2 μm or more and 30 μm or less, wherein the spherical amorphous silicon dioxide particles have an average particle diameter of 0.05 μm or more and 1.5 μm or less, and are contained in an amount of 0.02% by mass or more and 15% by mass or less based on the powder mixture.

### Claim 2 (depends on 1)

The powder mixture according to claim 1, wherein particles having a particle diameter of 2 μm or more contained in the powder mixture satisfy the following conditions (A) to (C):
(A) an average sphericity is 0.80 or more;
(B) the number percentage of particles having a sphericity of more than 0.70 and 0.75 or less is 10.0% or less; and
(C) the number percentage of particles having a sphericity of 0.70 or less is 10.0% or less.