Method for preparing an ester and binder system

US9637418B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Wilfried Aichele · Winnenden, DE
• Jochen Rager · Bisingen, DE
• Klaus Czerwinski · Iggingen, DE
• Eberhard Grath · Immenstadt im Allgäu, DE
• Josef Arnold · Ebikon, CH
• Eva Weisser · Waiblingen, DE

Key dates

• Filing date: Nov 25, 2009
• Grant date: May 2, 2017
• Expiry date: Feb 25, 2031

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2235/6022
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

In a method for preparing an ester from an hydroxybenzoic acid and a fatty alcohol for use in a binder system for powder injection molding, transesterification of an ester of the hydroxybenzoic acid and a low alcohol using the fatty alcohol is carried out, the fatty alcohol and the ester of the hydroxybenzoic acid and the low alcohol forming a reaction mixture and being used in an essentially equimolar ratio. The transesterification is carried out at a temperature at which the ester of the hydroxybenzoic acid and the low alcohol and the fatty alcohol are present as a homogeneous melt. The binder system for a powder injection molding contains 80 to 98 wt. % of a metal powder and/or a ceramic powder and 1 to 19 wt. % of a polymeric binder component, and 1 to 19 wt. % of at least one ester prepared by the transesterification.