Fine-grain silver oxide powder

Details Fine-grain silver oxide powder Fine-grain silver oxide powder

2007-06-05

2007-06-05

Vanoy, Timothy C. (Department: 1754)

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

C423S023000, C423S042000, C423S043000

Reexamination Certificate

active

10936646

ABSTRACT:
A silver oxide powder that replaces silver powder as a silver conductive paste filler has a specific surface area measured by the BET method is 1.0–25.0 m2/g, average primary particle diameter is 1–50 nm, and average secondary particle diameter is 1–1000 nm. The silver oxide powder is made by preparing a neutralization medium that is an aqueous solution containing one or both of sodium hydroxide and potassium hydroxide in a total amount of 0.5 mole/L or less, simultaneously adding an aqueous solution containing silver salt in an amount of 6.0 mole/L or less and an aqueous solution of at least one of sodium hydroxide and potassium hydroxide to the liquid medium to conduct a neutralization reaction, thereby obtaining a neutralized precipitate, maintaining the liquid at a pH in the range of 12±1.5 during the reaction, and subjecting the precipitate to filtration, washing, and drying.

REFERENCES:
patent: 4080210 (1978-03-01), Asada et al.
patent: 2005/0074394 (2005-04-01), Berube et al.
patent: 31 25 892 (1982-10-01), None
patent: 57-111955 (1982-07-01), None
patent: 2001-35255 (2001-02-01), None
The English abstract of JP 2001-035,255 A published Feb. 2001.
Denshi Zairyou (Electronic Materials), Jul. 2003, vol. 42, pp. 97-101.

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