DOWA Electronics Materials Co.

Okayama-shi, Japan

DOWA Electronics Materials Co.

Okayama-shi, Japan

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Patent
University of Tokyo and Dowa Electronics Materials Co. | Date: 2017-04-26

Provided are: a magnetic -form iron oxide nanopowder which is a novel magnetic iron oxide nanopowder having magnetic polarization and spontaneous electric polarization and having physical properties similar to those of half-metals; and a process for producing the magnetic nanopowder. The magnetic powder has a composition represented by Fe_(2)O_(3) and has a crystal structure belonging to the monoclinic system.


Patent
University of Shiga Prefecture and Dowa Electronics Materials Co. | Date: 2016-10-25

Silver nanowires coated with, instead of a polymer protective agent such as PVP, an organic protective agent having a smaller molecular weight are provided. The silver nanowires have an average diameter of 100 nm or less and an average length of 5 m or more, and a thiol having a molecular weight of 75 to 300 is adhered on surfaces of the metal silver. The silver nanowires have a thiol containing one thiol group in the structure adhered thereon. A thiol having only one thiol group (SH) in a molecule is a suitable target. Examples thereof include 1-dodecanethiol, 1-decanethiol, 1-octanethiol, 3-mercapto-1,2-propanediol, monoethanolamine thioglycolate, ammonium thioglycolate, and thiomalic acid.


Patent
Dowa Electronics Materials Co. | Date: 2016-10-24

After preparing a silver-coated copper powder wherein the surface of a copper powder having an average particle diameter of 0.1 to 100 m is coated with silver, the silver-coated copper powder is sprayed into the tail flame region of a thermal plasma to cause silver on the surface of the copper powder to diffuse in the grain boundaries of copper on the inside of the copper powder, and thereafter, the surface of the copper powder is coated with silver to produce a metal composite powder wherein the percentage of the area occupied by silver on a cross section of the metal composite powder is 3 to 20% and wherein the surface thereof is coated with silver.


Patent
Dowa Electronics Materials Co. | Date: 2016-10-24

There is prepared a silver-coated copper powder wherein the surface of a copper powder having an average particle diameter of 0.1 to 100 m is coated with 5% by weight or more of silver, and the silver-coated copper powder is sprayed into the tail flame region of a thermal plasma to cause silver on the surface of the copper powder to diffuse in the grain boundaries of copper on the inside of the copper powder to produce a metal composite powder wherein the percentage of the area occupied by silver on a cross section of the metal composite powder is 3 to 20%.


Patent
University of Tokyo and Dowa Electronics Materials Co. | Date: 2015-06-18

A magnetic -form iron oxide nanopowder is a novel magnetic iron oxide nanopowder having magnetic polarization and spontaneous electric polarization and having physical properties similar to those of half-metals; and a process produces the magnetic nanopowder. The magnetic powder has a composition represented by Fe_(2)O_(3 )and has a crystal structure belonging to the monoclinic system.


Patent
Dowa Electronics Materials Co. | Date: 2017-05-17

To improve weather resistance of an RFID tag containing a paper substrate having an antenna circuit formed on the surface thereof. An RFID tag substrate containing a paper substrate having an eluted chloride ion amount per unit mass (1 g) according to the following item (A) of 0.100 mg or less, having formed on a surface thereof a conduction circuit:(A) a specimen of the paper substrate having an area corresponding to an A4 size (210 297 mm) determined in ISO 216 is broken into small pieces each of 100 mm^(2) or less; the small pieces are entirely placed in a polypropylene vessel; 50 mL of water having an electric conductivity of 0.2 mS/m or less is added thereto to immerse the small pieces entirely into the water; after allowing to stand at 23C 2C for 1 hour, the water is filtered with a membrane filter to recover a filtrate; and the filtrate is analyzed by an ion chromatography method to obtain a chloride ion (Cl^(-)) concentration in the filtrate, from which a total chloride ion amount eluted into 50 mL of the water is obtained, and is divided by the mass (g) of the specimen of the paper substrate to provide a value, which is designated as the eluted chloride ion amount per unit mass.


Patent
DOWA Electronics Materials Co. | Date: 2017-07-12

There is provided an inexpensive bonding material, which can be easily printed on articles to be bonded to each other and which can suppress the generation of voids in the bonded portions of the articles to be bonded to each other, and a bonding method using the same. In a bonding material of a copper paste which contains a copper powder containing 0.3 % by weight or less of carbon and having an average particle diameter of 0.1 to 1 m, and an alcohol solvent, such as a monoalcohol, a diol, a triol or a terpene alcohol, the content of the copper powder is in the range of from 80 % by weight to 95 % by weight, and the content of the alcohol solvent is in the range of from 5 % by weight to 20 % by weight.


Patent
DOWA Electronics Materials Co. and Dowa F tec Co. | Date: 2017-08-09

There is provided a ferrite powder for bonded magnets having a high iHc value usable even in a low temperature environment, a method for producing the same, and a bonded magnet using the ferrite powder and having high iHc value which can be used even in a low temperature environment, wherein a specific surface area is 2.20 m^(2)/g or more and less than 3.20 m^(2)/g; a compression density is 3.30 g/cm^(3) or more and less than 3.60 g/cm^(3), and a compressed molding has a coercive force of 3250 Oe or more and less than 3800 Oe.


Patent
Dowa Electronics Materials Co. and Dowa F tec Co. | Date: 2017-08-09

There is provided a ferrite powder for bonded magnets capable of producing a ferrite bonded magnet having high BH_(max), and excellent in fluidity when converted to a compound, and having a high p-iHc value, and a method for producing the same, and a ferrite bonded magnet using the ferrite powder for bonded magnets, wherein an average particle size of particles obtained by a dry laser diffraction measurement is 5 m or less; a specific surface area is 1.90 m^(2)/g or more and less than 2.80 m^(2)/g; a compression density is 3.50 g/cm^(3) or more and less than 3.78 g/cm^(3), and a compressed molding has a coercive force of 2300 Oe or more and less than 2800 Oe.


Patent
Dowa Electronics Materials Co. and Dowa F tec Co. | Date: 2017-08-09

There is provided a ferrite powder for bonded magnets capable of producing ferrite bonded magnets with high BH_(max), excellent in MFR when converted to a compound, with high p-iHc, wherein an average particle size of particles obtained by a dry laser diffraction measurement is 5 m or less, a specific surface area is 1.90 m^(2)/g or more and less than 3.00 m^(2)/g, a compression density is 3.40 g/cm^(3) or more and less than 3.73 g/cm^(3), and a compressed molding has a coercive force of 2800 Oe or more and less than 3250 Oe.

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