Fine-grained polyether-ketone powder, process for the manufacture thereof, and the use thereof

US5247052A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Andreas Lucke · Waldbrunn, DE
• Dieter Steidl

Key dates

• Filing date: Jun 1, 1992
• Grant date: Sep 21, 1993
• Expiry date: Jun 1, 2012

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29K2071/00
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A fine-grained polyether-ketone powder, having a particle size with a d.sub.50 value smaller than or equal to 40 .mu.m and a grain size distribution range smaller than or equal to 55 .mu.m, is obtained by cold-grinding of coarse-grained polyether-ketone in a fluid-bed opposed-jets mill, which is provided with a grinding chamber (2) subjected to gas jets, a grinding material-charging device, a screening device (5) for separating coarse material (11) and fine material (10), and a bottom (3) underneath the grinding chamber for added material to be ground and coarse material flowing back from the screening device, the material to be ground and the coarse material flowing back from the screening device being cooled by means of a cryogenic refrigerant. The powders obtained in this way are used for producing surface coatings or composites.