Tanaka Kikinzoku Kogyo K.k.

National Institute of Advanced Industrial Science and Technology

Yuichi Makita

Hitoshi Kubo

Yuusuke Ohshima

Noriaki Nakamura

Junichi Taniuchi

Hidekazu Matsuda

Hiroki Sato

Masato Kasuga

Kenjiro Koshiji

Teruhisa Iwai

Yusuke Ohshima

Shingo Watanabe

Dai Shinozaki

Tatsuo Hasegawa

Shigeyuki Ootake

Toshikazu Yamada

Masahiro Ito

Satoshi Miyazaki

Kenji Matsuda

Hiroshi Noguchi

Shigeki Yamanaka

A silver ink including silver particles and a protective agent containing at least one amine compound dispersed in a dispersion medium containing, as a main solvent, a solvent having a vapor pressure at 20° C. of 40 mmHg or less and a vapor pressure at 70° C. of 0.09 mmHg or more, in an amount of 80% or more on a mass basis relative to the total dispersion medium. The amine compound has a mass average molecular weight of 115 or less, and the total amount of the amine compound is 1 part by weight or more and 14 parts by weight or less per 100 parts by weight of the silver particles. The silver ink has a moisture content of 500 ppm or more and 50,000 ppm or less and enables a practical metal film to be formed even through calcination at a low temperature of 70° C. or less.

Silver ink for low-temperature calcination

An electroconductive substrate including a base material and a metal wiring made of at least either of silver and copper, and the electroconductive substrate has an antireflection region formed on part or all of the metal wiring surface. This antireflection region is composed of roughened particles made of at least either of silver and copper and blackened particles finer than the roughened particles and embedded between the roughened particles. The blackened particles are made of silver or a silver compound, copper or a copper compound, or carbon or an organic substance having a carbon content of 25 wt % or more. The antireflection region has a surface with a center line average roughness of 15 nm or more and 70 nm or less. The electroconductive substrate is formed from metal wiring from a metal ink that forms roughened particles, followed by application of a blackening ink containing blackened particles.

Electroconductive substrate having metal wiring, method for producing the electroconductive substrate, and metal ink for forming metal wiring

The present invention relates to a method for forming a metal pattern on a pattern formation section set on a base material. In the present invention, a substrate provided with a fluorine-containing resin layer on a surface of the base material including the pattern formation section is used. The present inventive method for forming a metal pattern includes steps of: forming a functional group on the pattern formation section; and applying a metal ink including an amine compound and a fatty acid as protective agents to the base material surface to fix the metal particles on the pattern formation section. In the present invention, a fluorine-containing resin having a surface free energy measured by the Owens-Wendt method of 13 mN/m or more and 20 mN/m or less is applied as the fluorine-containing resin layer. Further, a metal ink including ethyl cellulose as an additive is applied as the metal ink.

Method for forming metal pattern

A metal ink containing metal particles including silver, a protective agent A including an amine compound, and a protective agent B including a fatty acid. The metal ink is configured such that the protective agent A includes at least one Camine compound, and the protective agent B includes at least one Cfatty acid. It is preferable that the amine compound content is 0.2 mmol/g or more and 1.5 mmol/g or less on a silver particle mass basis. In addition, it is preferable that the fatty acid content is 0.01 mmol/g or more and 0.06 mmol/g or less on a silver particle mass basis.

Metal ink

A metal paste formed by kneading a solid content including silver particles and a solvent, in which the solid content includes silver particles containing silver particles having a particle size of 100 to 200 nm by 30% or more based on the number of particles, the silver particles have an average particle size of 60 to 800 nm as a whole, the silver particles constituting the solid content are bound with an amine compound having 4 to 8 carbon atoms in total as a protective agent, and the metal paste contains as an additive a high-molecular-weight ethyl cellulose having a number average molecular weight of 40000 to 90000. Since the metal paste contains a high-molecular-weight ethyl cellulose, a sintered body having a low resistance can be maintained while printability is improved. The metal paste has favorable printability, and can form a sintered body having a low resistance even in a low temperature region of 150&#xb0; C. or lower.

Metal paste having excellent low-temperature sinterability and method for producing the metal paste

The present invention provides a method for forming a metal pattern on a pattern formation section set in a part or the whole of a region on a base material, the base material including a fluorine-containing resin layer on a surface including at least the pattern formation section, the method including the step of: forming a functional group on a pattern formation section of the fluorine-containing resin layer by a treatment such as ultraviolet-ray irradiation, then applying to the surface of the base material a metal fine particle dispersion liquid in which metal fine particles protected by an amine compound as a first protective agent and a fatty acid as a second protective agent are dispersed in a solvent, and fixing the metal fine particles on the pattern formation section.

Method for forming metal pattern, and electric conductor

The present invention provides a method for producing silver particles, including the steps of: mixing a thermally decomposable silver compound and an amine compound to prepare a silver-amine complex as a precursor; and heating the silver-amine complex at a heating temperature equal to or higher than the decomposition temperature of the silver-amine complex to precipitate silver particles, the silver compound being silver carbonate, the amine compound being terminated with a primary amino group on at least one end and containing a predetermined hydrocarbon group R with a carbon number of 4 to 10. In the method of the present invention, silver particles with the particle size controlled to fall within the range of 20 nm to 200 nm in terms of an average particle size can be produced.HN&#x2014;R&#x2003;&#x2003;[Chemical Formula 1]

Method for producing silver particles, and silver particles produced by the method

The present invention provides a method for producing silver particles, the method capable of adjusting the particle diameter to be within the range of several tens of nanometers to several hundreds of nanometers and also producing silver particles with a uniform particle diameter. The present invention relates to a method for producing silver particles by heating of a reaction system containing a thermally-decomposable silver-amine complex precursor, including a process of producing a silver-amine complex, a process of adding an organic compound having an amide (carboxylic amide) as a skeleton to a reaction system, and a process of heating the reaction system, in which a water content in the reaction system before the heating is 20 to 100 parts by weight relative to 100 parts by weight of the silver compound. The present invention can produce uniform silver particles while the particle diameter is controlled.

Method for manufacturing silver particles

Provided are a fine silver particle ink composed of hexylamine, dodecylamine, oleic acid, fine silver particles and a solvent, in which the volume resistivity of a sintered body at 100&#xb0; C. obtained after the ink is applied on a substrate by spin coating is 8 to 25 &#x3bc;&#x3a9;cm, a sintered body thereof, and a method for producing a fine silver particle ink. When a fine silver particle ink containing coated fine silver particles is produced by a silver-amine complex decomposition method, production can be carried out smoothly. The fine silver particle ink can be sintered even at a low temperature, and a sintered body thereof has a mirror surface and low volume resistance.

Fine silver particle ink, fine silver particle sintered body, and method for producing fine silver particle ink

A semiconductor device includes a semiconductor chip which can be a heat-generating semiconductor chip or a semiconductor relay substrate in which an integrated circuit or wiring is built in. A sintered-silver-coated film is adhered on a surface layer part of the semiconductor substrate, interposed by a silicon oxide film. A heat-dissipating fin (heat sink), which may be copper or aluminum, is bonded on the sintered-silver-coated film, interposed by an adhesive layer.

Growing community of inventors

Tsukuba, Japan

Yuichi Makita