Polyimide microparticles

US8404278B2 · kind B2 · utility

Assignee

• Helmholtz-Zentrum Geesthacht Zentrum für Material- und Küstenforschung GmbH

Inventors

• Wolfgang Albrecht · Berlin, DE
• Roland Hilke · Teltow, DE
• Karola Lützow · Berlin, DE
• Mario Rettschlag · Stahnsdorf, DE
• Filiana Santoso · Berlin, DE
• Thomas Weigel · Wilhelmshorst, DE

Key dates

• Filing date: Mar 22, 2005
• Grant date: Mar 26, 2013
• Expiry date: Jan 1, 2030

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2379/08
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

The invention relates to a polyimide microparticles which can be obtained by means of the following steps: a) a polymer solution consisting of at least one polyimide polymer and a solvent or a solvent mixture is produced according to methods known per se, b) microparticles are formed from the polymer solution by spraying or by thermal phase inversion, c) the microparticles obtained in step b) are treated with an aqueous functionalization solution containing an amine-containing modifier at a high temperature, with or without stirring, and d) the modified obtained are washed and optionally dried, according to methods known per se.