Patent ID: 7081214

Claim:
A conductive metal paste wherein: the conductive metal paste comprises an organic binder resin composition, ultrafine metal particles having a very small average particle diameter and metal fillers, that are both dispersed uniformly in the composition, an average particle diameter for said metal fillers is selected from a range of 0.5 to 20 μm, an average particle diameter for said ultrafine metal particles with a very small average particle diameter is chosen from a range of 1 to 100 nm, the surfaces of the ultrafine metal particles are coated with one coating compound or more which has a group containing a nitrogen, oxygen or sulfur atom and capable of coordinate-bonding by a lone pairs existing in the atoms as a group capable of coordinate-bonding to a metal element contained in the ultrafine metal particle, said one or more coating compounds having the group containing the nitrogen, oxygen or sulfur atom are contained in a total amount of 0.1 to 60 parts by weight based on 100 parts by weight of said ultrafine metal particles, said organic binder resin composition comprises a resin component acting as an organic binder, a reactive component having reactivity with the group containing the nitrogen, oxygen or sulfur atom of said coating compound when heated therewith, and at least one or more organic solvents, and said organic binder resin composition is contained in an amount of 5 to 100 parts by weight based on 100 parts by weight of a total of the metal fillers and the ultrafine metal particles having a very small average particle diameter, wherein said coating compound which has the group containing the nitrogen, oxygen or sulfur as a group capable of coordinate-bonding by the lone pair is selected from amine compounds having one or more terminal amino groups, thiol compounds having one or more sulfanyl groups (—SH) or glycols having two hydroxyl groups, and one or more organic acid anhydrides or derivative(s) thereof are selected as said reactive component having reactivity with the group containing the nitrogen, oxygen or sulfur atom.