Patent ID: 8758475
Filing Date: 2014-06-24
Classification: B22F,B82Y,C01P,C04B,C09C,H05K

Abstract:
1. Fine metal particles in the form of a dry powder, characterized in that the fine metal particles in the form of a dry powder are free from any solvent, an average particle size of the fine metal particles themselves is selected in the range of 1 to 20 nm, the surface of the fine metal particles themselves is covered with one or more compounds selected from the group consisting of diamine compounds having an alkyl substituent on one of two amino groups, hydroxyamine compounds having an O-alkyl substituent, and monoamines containing a branched alkyl group, which diamine compounds, hydroxyamine compounds and monoamines have a boiling point of from 150° C. to 300° C., a covering amount of said one or more compounds is adjusted by selecting total of said one or more compounds in the range of 5 to 35 parts by mass based on 100 parts by mass of the fine metal particles themselves, and thus, the fine metal particles in the form of a dry powder are composed of the fine metal particles themselves and the one or more compounds; wherein a thickness of the covering layer formed with the adjusted covering amount is at least 0.5 nm or thicker, and selected in the range of 2/10 to 8/10 of the average particle size of the fine metal particles themselves.