Abstract: A powder mixture for powder metallurgy comprising a starting powder for powder metallurgy containing a metal powder, a powder of physical property improving ingredients and a lubricant and, blended therewith as a binder, a synthetic styrenic rubber copolymer comprising:5 to 75 parts by weight of styrene and95 to 25 parts by weight of butadiene and/or isoprene,as the monomer ingredient or a hydrogenation product thereof. The binder can suppress the segregation of the physical property improver and the lubricant, as well as dusting upon handling the powder.

Abstract: A powder mixture used for powder metallurgy containing a metal powder as a substrate, in which a copolymer comprising the following monomer ingredients as a binder is blended:______________________________________ acrylic acid ester: 20 to 70 parts by weight methacrylic acid ester: 80 to 30 parts by weight polymerizable unsaturated acid: 0.5 to 9 parts by weight based on 100 parts by weight of the sum for the acrylic ester and the methacrylic acid ester, ______________________________________as a binder is blended therewith.The powder mixture used for powder metallurgy is manufactured by mixing the starting powdery metal material with the starting powdery material for the physical property improving ingredient, adding the solution of the binder thereto and then applying stirring and drying.Graphite segregation can be prevented without de-naturing or reducing flow rate of the substrate metal and dusting upon handling can be suppressed.