Composite electroconductive powder, electroconductive paste, process for producing electroconductive paste, electric circuit and process for producing electric circuit
US5951918A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 5, 1997 |
| Grant date | Sep 14, 1999 |
| Priority date | — |
| Expiry date | Aug 5, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K1/095
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electroconductive paste for forming an electric circuit which is low in resistivity, high in electroconductivity and minimized in change of resistivity even after a thermal shock test and/or a humidity and DC applied test, can be obtained by using a composite electroconductive powder comprising a flake-like electroconductive powder made of a material such as silver, a silver alloy, a silver-coated copper powder or a silver-coated copper alloy powder and an unsteady-shaped electroconductive powder such as a reduced silver powder. Also, by using a composite electroconductive powder comprising an electroconductive powder having an aspect ratio of 6 or greater and an electroconductive powder having an aspect ratio of 5 or less, there can be obtained an electroconductive paste which is low in resistivity, high in electroconductivity, minimized in change of resistivity even after a thermal shock test and/or a humidity and DC applied test, and capable of improving probability of contact between the electroconductive powder particles, elevating electroconductivity of the electric circuit, and also raising electroconductivity especially when a circuit is printed on a sheet-like substrate…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.