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AssigneeVacuum Metallurgical Co., Ltd.
InventorsKazuhiro Watanabe, Michihiro Oshima, Kazuhiro Setoguchi, Masaaki Oda
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A metal paste comprising ultrafine particles of a metal. The particles have a particle size of 1000 angstroms (0.1 micron) or less and are individually uniformly dispersed in an organic solvent. A process for producing a metal paste comprises the steps of evaporating a metal in a vacuum chamber in an atmosphere of an inert gas at a pressure of 10 Torr or less and of collecting the vapor of the evaporated metal on a cooling surface in the form of ultrafine particles having a particle size of 1000 angstroms (0.1 micron) or less, wherein a vapor of an organic solvent is introduced into the vacuum chamber while the metal is being evaporated. A method for preparing a metallic thin film having a thickness of between 0.01 micron and 1 micron. A metal paste containing ultrafine metal particles having a diameter of 0.1 micron or less uniformly dispersed in an organic solvent is coated on a substrate, dried and sintered.
A metal paste comprising at least 14 wt. % of ultrafine particles of gold individually uniformly dispersed in a solvent consisting essentially of at least one organic compound, said particles having a particle size of 100 angstroms or less and each particle having its entire surface covered with the solvent.
A metal paste comprising at least 14 wt. % of ultrafine particles of gold individually uniformly dispersed in a solvent consisting essentially of at least one organic compound, said particles having a particle size of 100 angstroms or less and each particle having its entire surface covered with the solvent, the solvent containing one or more alcohols having 5 carbon atoms or more, or a solvent containing one or more organic esters.
Dependencies are inferred from the claim text.