To provide a metal powder having more excellent dispersibility into a resin and catalyst efficiency than a chain metal powder; a manufacturing method therefor; an anisotropic electroconductive film using the metal powder; an electroconductive paste; and a catalyst.
The tubular metal powder is formed into a tubular shape by the steps of: coating the surface of a chain core powder with a metal which is a main material; and eliminating the core powder from the above product. The anisotropic electroconductive film contains the tubular metal powder which has been formed by using Au as the main metal, and has an average length of the chain adjusted to less than distance between electrodes to be electrically connected, as an electroconductive component. The anisotropic electroconductive paste contains the tubular metal powder which has been formed by using Ag as the main metal, and has an average length of the chain adjusted to 1 to 20 μm, as an electroconductive component. The catalyst employs the tubular metal powder which has been formed by using Pt as the main metal, and has a ratio L/(D2-D1) of the average length (L) of the chains to a difference (D2-D1) between a mean inner diameter (D1) and a mean outer diameter (D2) of the chains adjusted to 10 to 1,000.
TOSHIOKA HIDEAKI
KASUGA TAKASHI
MASHIMA MASATOSHI
Mio Kawasaki