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:
Jul. 31, 2012
Filed:
Oct. 12, 2006
Harald Haeger, Luedinghausen, DE;
Franz-erich Baumann, Duelmen, DE;
Wolfgang Lortz, Waechtersbach, DE;
Christoph Batz-sohn, Hanau-Mittelbuchen, DE;
Harald Haeger, Luedinghausen, DE;
Franz-Erich Baumann, Duelmen, DE;
Wolfgang Lortz, Waechtersbach, DE;
Christoph Batz-Sohn, Hanau-Mittelbuchen, DE;
Evonik Degussa GmbH, Essen, DE;
Abstract
Process for preparing ultrafine powders based on polyamides by contacting polyamides having a relative solution viscosity ηin the range from 1.5 to 2.0, measured in 0.5% m-cresol solution at 25° C., with an alcoholic medium in the presence of inorganic particles under the action of pressure and/or temperature to generate an at least partial solution, and then precipitating the polyamide from the at least partial solution, characterized in that a suspension of the inorganic particles suspended in the alcoholic medium is used. The resulting ultrafine polyamide powders have a specific BET surface area in the range of 5-100 m/g; a fineness dof less than 70 μm; an apparent density AD in the range from 250 to 1000 g/l; and a particle content of 0.1 to 80% by weight of inorganic particles based on the total weight of the polyamide powder. They are equally suitable for coatings and for moldings and components with improved mechanical properties.