Dowa Electronics Materials Co., Ltd.

Noriaki Nogami

Hiroshi Kamiga

Taku Okano

Aiko Hirata

Kenichi Harigae

Naoki Tahara

Koji Hirata

Taro Nakanoya

Yoshio Moteki

Hiroaki Koubu

Kairi Otani

While a water reaction system containing silver ions is irradiated with ultrasonic waves to cause cavitation therein, a reducing agent containing solution, which contains an aldehyde as a reducing agent, is mixed with the water reaction system to deposit silver particles, the solid-liquid separation of which is carried out, and thereafter, the separated silver particles are washed and dried to produce a spherical silver powder which has a closed cavity in each particle thereof.

Spherical silver powder and method for producing same

There is provided an electrically conductive paste which can prevent the increase of the volume resistivity of an electrically conductive film formed from the electrically conductive paste even if the electrically conductive film is heated to a soldering temperature of about 380&#xb0; C. when the electrically conductive paste is a resin type electrically conductive paste using a silver powder and a silver-coated copper powder. In an electrically conductive paste containing a resin, a silver powder and a silver-coated copper powder having a copper powder, the surface of which is coated with a silver layer, the resin is an epoxy resin having a naphthalene skeleton, and there is added a dicarboxylic acid, preferably a dicarboxylic acid having a rational formula of HOOC&#x2014;(CH)&#x2014;COOH (n=1-8), and more preferably a dicarboxylic acid having a rational formula of HOOC&#x2014;(CH)&#x2014;COOH (n=4-7).

Electrically conductive paste

There is provided an inexpensive silver particle dispersing solution being usable as a slurry for ink jet, a method for producing the same, and a method for producing a conductive film using the silver particle dispersing solution. In a silver particle dispersing solution containing a silver powder and a solvent, the silver powder has an average primary particle diameter (D) of 0.15 to 0.5 &#x3bc;m, and the ratio (D/D) of a particle diameter (D), which corresponds to 50% of accumulation in volume-based cumulative distribution of the silver powder, to the average primary particle diameter (D) is not less than 1.7, the silver powder having a fatty acid adhered to the surface thereof, and the solvent containing a monohydric higher alcohol having a carbon number of 6 to 12, butyl carbitol or butyl carbitol acetate as the main component thereof.

Silver particle dispersing solution, method for producing same, and method for producing conductive film using silver particle dispersing solution

A conductive paste including: a conductive powder containing silver; an indium powder; a silver-tellurium-coated glass powder; a solvent; and an organic binder, wherein the silver-tellurium-coated glass powder is a silver-tellurium-coated glass powder including a tellurium-based glass powder containing tellurium in an amount of 20% by mass or more, and a coating layer on a surface of the tellurium-based glass powder, the coating layer containing silver and tellurium as a main component.

Conductive paste, method for producing same, and method for producing solar cell

A silver powder, wherein the silver powder satisfies D-IPA&#x3e;D-W, where in measurement of a volume-based particle size distribution of the silver powder by a laser diffraction particle size distribution analysis, D-IPA (&#x3bc;m) is a cumulative 50% point of particle diameter of the silver powder when isopropyl alcohol (IPA) is used as a measurement solvent for dispersing the silver powder, and D-W (&#x3bc;m) is a cumulative 50% point of particle diameter of the silver powder when water is used as a measurement solvent for dispersing the silver powder, and wherein a phosphorus content in the silver powder is 0.01% by mass or more but 0.3% by mass or less.

Silver powder, method for producing same, and hydrophilic conductive paste

To provide a silver-coated graphite mixed powder including: silver-coated graphite particles each including a graphite particle and silver coated on a surface of the graphite particle, where when a solution obtained by dissolving the silver-coated graphite mixed powder in nitric acid is analyzed through inductively coupled plasma (ICP) emission spectrometry, an amount of silver is 5% by mass or more but 90% by mass or less, an amount of tin is 0.01% by mass or more but 5% by mass or less, and an amount of zinc is 0.002% by mass or more but 1% by mass or less.

Silver-coated graphite particles, silver-coated graphite mixed powder and production method therefor, and conductive paste

There is provided a silver-coated copper powder which can improve the conversion efficiency of a solar cell in comparison with conventional silver-coated copper powders when it is used in an electrically conductive paste used for forming the busbar electrodes of the solar cell, the silver-coated copper powder being capable of producing a solar cell having a high conversion efficiency which is the same degree as that of a solar cell using silver powder, and a method for producing the same. A silver-coated copper powder obtained by coating the surface of a copper powder, which is obtained by the atomizing method or the like, with 5 wt % or more (with respect to the silver-coated copper powder) of a silver containing layer of silver or a silver compound, is added to a cyanide solution, such as a potassium silver cyanide solution, a potassium gold cyanide solution, a potassium cyanide solution or a sodium cyanide solution, to cause the copper powder coated with the silver containing layer to contain 3 to 3000 ppm of cyanogen.

Silver-coated copper powder and method for producing same

Provided is a silver-tellurium-coated glass powder including: a tellurium-based glass powder containing tellurium in an amount of 20% by mass or more; and a coating layer on a surface of the tellurium-based glass powder, the coating layer containing silver and tellurium as a main component. Preferable aspects include an aspect where the coating layer containing silver and tellurium as a main component further contains a component that is other than silver and tellurium and contained in the tellurium-based glass powder, and an aspect where the component that is lo other than silver and tellurium and contained in the tellurium-based glass powder contains one or more kinds selected from zinc, lead, bismuth, silicon, lithium, and aluminum.

Silver-tellurium-coated glass powder, production method for silver-tellurium-coated glass powder, conductive paste, and production method for conductive paste

After preparing a silver-coated copper powder wherein the surface of a copper powder having an average particle diameter of 0.1 to 100 &#x3bc;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.

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Tokyo, Japan

Noriaki Nogami