Toyo Ink Mfg. Co., Ltd.

Toyo Ink Sc Holdings Co., Ltd.

Toyo Ink Co., Ltd.

Kinya Shiraishi

Kaori Sakaguchi

Masashi Koide

Hiromi Yokoyama

Kaori Nakamura

Kouji Miyabayashi

Yuji Soneta

Yukifumi Mashimo

Yuko Fujisaki

Shinsuke Yamada

Disclosed is a method for producing a metal particle dispersion wherein a metal compound is reduced by using carbodihydrazide represented by the formula (1) below or a polybasic acid polyhydrazide represented by the formula (2) below (wherein R represents an n-valent polybasic acid residue) in a liquid medium. By reducing the metal compound in the presence of a compound having a function preventing discoloration of the metal, there can be obtained a metal particle dispersion having excellent discoloration preventing properties. Metal particles produced by such methods have a uniform particle diameter and are excellent in dispersion stability. By using a conductive resin composition or conductive ink containing a metal particle dispersion obtained by such production methods, there can be formed a conductive coating film, such as a conductive circuit or an electromagnetic layer, having good characteristics. 

Method for producing metal particle dispersion, conductive ink using metal particle dispersion produced by such method, and conductive coating film

A conductive coating film is formed on a substrate by bringing a conductive material covered with a protective material into contact with a material having anion exchange ability, through such a process wherein an anion exchange layer containing a material having anion exchange ability is formed on a substrate and then a layer containing a conductive material covered with a protective material is formed on the anion exchange layer, or alternatively through such a process wherein a layer containing a conductive material covered with a protective material is formed on a substrate and then an anion exchange layer containing a material having anion exchange ability is formed on the layer containing a conductive material. The anion exchange layer and the layer containing a conductive material may be formed by coating, printing or the like. By using this method, a conductive coating film having excellent adhesion to a substrate can be formed on an ordinary paper substrate, plastic substrate and glass substrate at low temperature in short time.

Method for producing conductive coating film

This invention provides an electrically conductive ink comprising an electrically conductive material and a vinyl chloride/vinyl acetate/hydroxyalkyl (meth)acrylate copolymer resin. There is also provided a noncontact-type medium comprising a base material and, provided on the base material, an electrically conductive circuit formed using the electrically conductive ink, and an IC chip mounted in the state of being electrically conducted to the electrically conductive circuit. An electrically conductive circuit, which is in a thin film form, can be used as an antenna circuit for noncontact-type media, has a low volume resistivity on the order of 10&#x3a9;&#xb7;cm, and is highly reliable under a high temperature and high humidity environment, can be formed by using the electrically conductive ink at a low temperature in a short time.

Electrically conductive ink, electrically conductive circuit, and non-contact-type medium

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Tokyo, Japan

Kinya Shiraishi