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US 10,941,304 B2Granted
Metal powder sintering paste and method of producing the same, and method of producing conductive material
AssigneeNichia Corporation
InventorsTeppei Kunimune, Masafumi Kuramoto
Life of this patent
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Abstract
There is a problem that when a silver powder sintering paste that is substantially free from resin is used, an organic solvent used as a dispersion medium bleeds, which results in contamination and wire bonding defects. In order to solve the problem, provided is a metal powder sintering paste that contains, as a principal component, silver particles having an average particle diameter (a median diameter) of 0.3 μm to 5 μm and further contains an anionic surfactant but is substantially free from resin.
Claims25
A metal powder sintering paste,
- the paste comprising, as a principal component, silver particles having a median diameter of 0.3 μm to 5 μm, and
- further comprising an anionic surfactant, and
- being substantially free from resin,
- wherein
- the surfactant is one in which when the temperature is increased with thermogravimetric-differential thermal analysis (TG-DTA) from room temperature to 350° C. at 2° C./min, a residue is reduced to not more than 20% by mass with respect to the initial mass, and
- wherein
- a content of the surfactant is not more than 2% by mass with respect to the paste.
4 more elements
A metal powder sintering paste,
- the paste comprising, as a principal component, silver particles having a median diameter of 0.3 μm to 5 μm, and
- further comprising an anionic surfactant, and
- being substantially free from resin,
- wherein
- a content of the surfactant is not more than 2% by mass with respect to the paste, and
- wherein
- a bleed ratio is less than 1.70,
- wherein the bleed ratio is calculated as a ratio of a diameter after bleeding to an original diameter of the paste
- when the paste is applied onto a substrate having a gold electrode with a surface roughness Ra of 0.04 μm on its surface by a stamping method to have a diameter of 170±50 μm, which then is left to stand for 20 minutes, and
- the diameter after bleeding is measured by measuring the diameter including a dispersion medium that had bled.
7 more elements
Dependencies are inferred from the claim text.