Process for the continuous thermal removal of binder from a metallic and/or ceramic shaped body produced by injection molding, extrusion or pressing using a thermoplastic molding composition

US9556072B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Johan ter Maat · Mannheim, DE
• Hans Wohlfromm · Ludwigshafen, DE
• Martin Bloemacher · Meckenheim, DE
• Arnd Thom · Alzey, DE
• Andreas Kern · Roth, DE

Key dates

• Filing date: Jun 22, 2010
• Grant date: Jan 31, 2017
• Expiry date: May 15, 2033

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2235/661
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention relates to a process for the continuous thermal removal of binder from a metallic and/or ceramic shaped body which has been produced by injection molding, extrusion or pressing using a thermoplastic composition and comprises at least one polyoxymethylene homopolymer or copolymer as binder in a binder removal oven, which comprises the steps (a) removal of binder from the shaped body in a binder removal oven at a temperature which is from 5 to 20° C. below, preferably from 10 to 15° C. below, the temperature of a second temperature stage over a period of from 4 to 12 hours in a first temperature stage in an oxygen-comprising atmosphere, (b) removal of binder from the shaped body at a temperature in the range >160 to 200° C. over a period of from 4 to 12 hours in an oxygen-comprising atmosphere in a second temperature stage and (c) removal of binder from the shaped body at a temperature in the range from 200 to 600° C. over a period of from 2 to 8 hours in a third temperature stage in an oxygen-comprising or neutral or reducing atmosphere, with the shaped bodies being transported through the binder removal oven during process steps (a) and (b).