Patent ID: 7550513

Claim:
A dispersion comprising fine particles of copper hydride dispersed in a water insoluble organic liquid; wherein the copper hydride fine particles are obtained by adding a reducing agent to an aqueous solution of cooper ion comprising C 4-100 organic straight chain compound having at least one group selected from the group consisting of an amino group, an amide group, a mercapto group (—SH), a sulfide group (—S—), a hydroxyl group, a carboxyl group, a carbonyl group and an etheric oxy group, wherein the pH of the aqueous solution is 3 or less, the dispersion comprising fine particles of copper hydride dispersed in a water insoluble organic liquid is a storage stable ink for the application of an electrically conductive copper layer; an average particle diameter of the fine particles of copper hydride is at most 50 nm, and the surface of the copper hydride fine particles is coated with a C 4-100 organic straight chain compound having at least one group selected from the group consisting of an amino group, an amide group, a mercapto group (—SH), a sulfide group (—S—), a hydroxyl group, a carboxyl group, a carbonyl group and an etheric oxy group.