Patent ID: 8535573
Filing Date: 2013-09-17
Classification: B22F,B82Y,C22B,Y02P

Abstract:
1. A method for producing copper fine particles which can be sintered at low temperatures and which have an average particle size of 50nm or less, by heating and reducing an oxide, hydroxide, or salt of copper included in a solution of ethylene glycol, diethylene glycol, or triethylene glycol, the method comprising: bringing a water-soluble polymer into contact with an anion exchange resin to remove halogen from the water-soluble polymer, adding the water-soluble polymer as a dispersant and a noble metal compound containing no halogen or noble metal colloid containing no halogen for nucleation to the solution, and controlling a total halogen content of the solution including the water-soluble polymer and the noble metal compound or noble metal colloid to be less than 20 ppm by mass relative to copper.