Patent ID: 7850760

Claim:
A process for production of a chain metal powder by a reduction deposition reaction, which comprises the steps of reducing ferromagnetic metal ions contained in an aqueous solution through the action of a reducing agent while applying a magnetic field to the solution in a fixed direction thereby to deposit fine metal particles, and bonding a lot of the fine metal particles in a chain form so as to orient the fine metal particles in a direction of the applied magnetic field through magnetism of the fine metal particles, characterized in that the reduction deposition reaction is conducted in the presence of a polymer compound comprising: (a) repeating units represented by the formula (1): and (b) repeating units represented by the formula (2): wherein R 1 represents an aromatic group which has no substituent, an aromatic group which has an alkyl group having 1 to 4 carbon atoms or an alkoxy group having 1 to 4 carbon atoms as a substituent, or a cycloalkyl group.