Electroconductive fine particle, method of producing electroconductive fine particle, and anisotropic electroconductive material
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example 1
[0061] Divinyl benzene type polymer resin particles having a particle diameter of 4 μm (manufactured by Sekisui Chemical Co., Ltd.) were treated for 5 minutes with 10 wt% ion adsorbent, then treated for 5 minutes with 0.01 wt% aqueous palladium sulfate, further subjected to reduction treatment by adding dimethyl amine borane, filtered, washed, and reacted by dipping in a nickel plating solution to obtain fine particles plated with nickel.
[0062] Then, a solution containing 10 g of sodium chloroaurate and 1000 mL of deionized water was prepared, and 10 g of the resulting fine particles plated with nickel was mixed with the solution to prepare an aqueous suspension. 30 g of ammonium thiosulfate, 80 g of ammonium sulfite and 40 g of ammonium hydrogen phosphate were introduced into the resulting aqueous suspension to prepare a plating solution. 10 g of hydroxyl amine was introduced into the resulting plating solution which was then adjusted to pH 10 with ammonia, and the mixture was rea...
example 2
[0064] For the nickel-plated fine particles obtained in Example 1, a solution containing 16 g of chloroauric acid and 1000 mL of deionized water was prepared and then mixed with 10 g of the nickel-plated fine particles to prepare an aqueous suspension. 30 g of ammonium thiosulfate, 80 g of ammonium sulfite, and 40 g of ammonium hydrogen phosphate were introduced into the resulting aqueous suspension to prepare a plating solution. 5 g of aminopyridine was introduced into the resulting plating solution which was then adjusted to pH 7 with ammonia, and the mixture was reacted for about 15 to 20 minutes at a bath temperature kept at 60° C., whereby electroconductive fine particles having a gold coating formed thereon was obtained.
[0065] The resulting electroconductive fine particles were dipped for 15 minutes in 1 wt% nitric acid solution, and the amount of dissolved nickel was measured by neutralization titration. As a result of this dissolution test using nitric acid, the amount of d...
example 3
[0070] The electroconductive fine particles obtained in Example 1 were added to 100 parts of epoxy resin (Epicoat 828, manufactured by Yuka-Shell Epoxy Co., Ltd.) as resin of the resin binder, 2 parts of tris-dimethylaminoethyl phenol and 100 parts of toluene, then sufficiently mixed by a sun-and-planet stirrer, and applied onto a release film such that the resulting coating after drying became 7 μm, and then the toluene was evaporated, whereby an adhesive film containing the electroconductive fine particles was obtained. The amount of the electroconductive fine particles incorporated into the film was 50,000 particles / cm2.
[0071] Thereafter, the adhesive film containing the electroconductive fine particles was stuck at ordinary temperatures onto an adhesive film obtained without incorporating the electroconductive fine particles, to obtain an anisotropic electroconductive film of 2-layer structure having a thickness of 17 μm.
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Abstract
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