Abstract: A sealing composition which can be handled in a semi-cured state and can obtain a sintered body having excellent joining strength and sealing performance is provided. A sealing composition including a solder powder, coated silver particles including silver core particles and a coating agent arranged on a surface of the silver core particles, and a solvent is provided. Further, a sintering temperature (T2) of the coated silver particles and a boiling point (T3) of the solvent satisfy T2?T3.

Abstract: A coated silver particle (20) according to the present invention contains a silver core particle (21), and a plurality of aliphatic carboxylic acid molecules (22) absorbed to a surface of the silver core particle (21) at a density of 2.5 to 5.2 molecules per square nanometer (nm2). A carbon number of an aliphatic group of the aliphatic carboxylic acid molecule (22) is preferably 5 to 26. When an arithmetical average value and a standard deviation of primary particle diameters are represented by DSEM and SD, respectively, DSEM is preferably 0.02 to 5.0 ?m and a particle diameter variation rate defined by a general formula SD/DSEM is preferably 0.01 to 0.5.

Abstract: A method for producing coated copper particles having a surface coated with an aliphatic carboxylic acid, wherein the method comprises obtaining a reaction mixture containing copper formate, an amino alcohol, an aliphatic carboxylic acid having an aliphatic group having 5 or more carbon atoms, and a solvent, and subjecting a complex compound formed in the reaction mixture to thermal decomposition treatment to form metal copper, wherein a ?SP value, which is a difference in SP value between the amino alcohol and the solvent, is 4.2 or more.

Abstract: A method for producing coated copper particles having a surface coated with an aliphatic carboxylic acid, wherein the method comprises obtaining a reaction mixture containing copper formate, an amino alcohol, an aliphatic carboxylic acid having an aliphatic group having 5 or more carbon atoms, and a solvent, and subjecting a complex compound formed in the reaction mixture to thermal decomposition treatment to form metal copper, wherein a ?SP value, which is a difference in SP value between the amino alcohol and the solvent, is 4.2 or more.

Abstract: A method for producing coated copper particles having a surface coated with an aliphatic carboxylic acid, wherein the method comprises obtaining a reaction mixture containing copper formate, an amino alcohol, an aliphatic carboxylic acid having an aliphatic group having 5 or more carbon atoms, and a solvent, and subjecting a complex compound formed in the reaction mixture to thermal decomposition treatment to form metal copper, wherein a ?SP value, which is a difference in SP value between the amino alcohol and the solvent, is 4.2 or more.