PURPOSE: To obtain polyamide series binder, which is suitable to injection- molding of metal powder, by mixing the specific polyamide resin and amide compound with the other resin at the specific ratio.
CONSTITUTION: In the case of inspecting variation of weight in N2 with a thermobalance under 5°C/min raising temp. to 50mg sample as the binder for injection-molding the metal powder, 20W60wt.% one or more kinds of the polyamide resin, whose temp. for 50wt.% loss is 350W470°C, to the whole and in the variation of weight in N2 with the thermobalance under 5°C/min raising temp. to 50mg sample, 20W60wt.% one or more kinds of the amide compound, whose temp. for 50wt.% loss is 150W350°C and molecular wt. is 135W600, to the whole, and ≥60% the total of the above raw materials are to use to the whole and ≤40% the balance resin except the above raw materials may be used. By using the above composite mixed material as the binder for injection- molding the metal powder, the shape keeping property after injection-molding and even at the time of degreasing is improved.
SAITO KATSUYOSHI
YATSUGAMI HARUO
SAIKI TAKEO
MASUDA YOSHIMICHI
