Okayama-shi, Japan
Okayama-shi, Japan

Time filter

Source Type

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
University of Tokyo and Dowa Electronics Materials Co. | Date: 2016-08-08

An epsilon-type iron oxide having an Fe-site that is substituted with a platinum group element, provided that Fe of a D-site of the epsilon-type iron oxide is not substituted with the platinum group element.


A composition containing fine silver particles which have a uniform particle size, can form a fine drawing pattern, and have a small environmental impact, a method for producing that composition, a method for producing fine silver particles, and a paste having fine silver particles are provided. The fine silver particles are produced by carrying out a fluid preparation step of preparing a reduction fluid, a silver reaction step, and a filtration/washing step. The reaction step is carried out by adding an aqueous silver nitrate fluid to a reduction fluid whose temperature has been increased to a range between 40 and 80C. The aqueous silver nitrate fluid is added at a stretch. The composition containing fine silver particles is produced by dispersing the composition containing the fine silver particles in a polar fluid.


Patent
Dowa Electronics Materials Co. and Dowa IP Creation Co. | Date: 2016-10-05

There are provided ferrite particles that have, as a main component, a material represented by a composition formula M_()Fe_(3-)O_(4) (where M is at least one type of metal selected from a group consisting of Mg, Mn, Ca, Ti, Cu, Zn, Sr and Ni, 0 < < 1), where the maximum height Rz of the particles falls within a range of 1.40 to 1.90, and the degree of distortion Rsk of the particles falls within a range of - 0.25 to - 0.07. In this way, when the ferrite particles are used as the carrier of an electrophotographic image forming apparatus, even if an image formation speed is increased, the occurrence of a failure is reduced for a long period of time.


Patent
DOWA Electronics Materials Co. | Date: 2016-08-24

A copper particle dispersing solution obtained by dispersing fine copper particles having an average particle diameter of 1 to 100 nm, each of the fine copper particles being coated with an azole compound, such as benzotriazole, and coarse copper particles having an average particle diameter of 0.3 to 20 m in a dispersing medium, such as ethylene glycol, so as to cause the total amount of the fine copper particles and coarse copper particles to be 50 to 90 % by weight and so as to cause the ratio of the weight of the fine copper particles to the weight of the coarse copper particles to be in the range of from 1:9 to 5:5, is applied on a substrate by screen printing or flexographic printing to be preliminary-fired with vacuum drying, and then, fired with light irradiation by irradiating light having a wavelength of 200 to 800 nm at a pulse period of 100 to 3000 m and a pulse voltage of 1600 to 3600 V, to form a conductive film on the substrate.

Loading DOWA Electronics Materials Co. collaborators
Loading DOWA Electronics Materials Co. collaborators