The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 26, 2013
Filed:
Mar. 22, 2005
Wolfgang Albrecht, Teltow, DE;
Roland Hilke, Teltow, DE;
Karola Lützow, Berlin, DE;
Mario Rettschlag, Stahnsdorf, DE;
Filiana Santoso, Berlin, DE;
Thomas Weigel, Wilhelmshorst, DE;
Wolfgang Albrecht, Teltow, DE;
Roland Hilke, Teltow, DE;
Karola Lützow, Berlin, DE;
Mario Rettschlag, Stahnsdorf, DE;
Filiana Santoso, Berlin, DE;
Thomas Weigel, Wilhelmshorst, DE;
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.