Process for the cold molding of particulate materials

US6774161B2 · kind B2 · utility

Assignee

• WACKER POLYMER SYSTEMS GMBH & CO. KG · DE

Inventors

• Abdulmajid Hashemzadeh · Altötting, DE
• Klaus Kohlhammer · Marktl, DE
• Thomas Lehmann · Sinzing, DE
• Peter Weiler · Waterloo, CA

Key dates

• Filing date: Jan 30, 2003
• Grant date: Aug 10, 2004
• Expiry date: Jan 30, 2023

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J5/04
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

Particulate materials are cold molded by preheating a binder and the material to be bound to a temperature of from 160 to 240° C., and then press molding at a temperature less than 80° C. and at a pressure of from 1 to 120 bar to give a molding, wherein the binder contains a polymer powder or aqueous polymer dispersion thereof, the polymer having a glass transition temperature Tg greater than 80° C. and a complex viscosity less than 15,000 Pa·s at 190° C., and derived from one or more comonomer units from the group of vinyl esters of optionally branched C1-18 alkylcarboxylic acids, (meth)acrylic esters of optionally branched C1-15 alcohols, dienes, olefins, vinylaromatics, and vinyl halides. The moldings exhibit excellent properties including resistance to sagging at elevated temperatures, and are recyclable.