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:
Apr. 09, 2013
Filed:
Sep. 12, 2012
Hui Chin, Springfield, VA (US);
Andrew Joseph Leggio, Las Vegas, NV (US);
Matthew Edward Gande, Norwalk, CT (US);
Anthony David Debellis, Stony Point, NY (US);
Sai Ping Shum, Pleasantville, NY (US);
Per Magnus Kristiansen, Zürich, CH;
Klaus Stoll, Binzen, DE;
Hans-werner Schmidt, Bayreuth, DE;
Nils Mohmeyer, Osnabrück, DE;
Hui Chin, Springfield, VA (US);
Andrew Joseph Leggio, Las Vegas, NV (US);
Matthew Edward Gande, Norwalk, CT (US);
Anthony David Debellis, Stony Point, NY (US);
Sai Ping Shum, Pleasantville, NY (US);
Per Magnus Kristiansen, Zürich, CH;
Klaus Stoll, Binzen, DE;
Hans-Werner Schmidt, Bayreuth, DE;
Nils Mohmeyer, Osnabrück, DE;
BASF SE, Ludwigshafen, DE;
Abstract
Disclosed are electret materials with outstanding thermal and charge stability. The electret materials comprise a melt blend of a thermoplastic polymer and one or more compounds selected from the aromatic trisamides. The aromatic trisamides are for example of the formula The melt blends are subjected to an electret treatment, for example a corona treatment. The electret materials are for example nonwoven polyolefin webs and are employed as filter materials, wipes, absorbent materials, filter masks, acoustic materials, printing substrates, measuring devices or contactless switches. The present electret materials may also comprise a further additive selected from the hindered amine light stabilizers and the hydroxyphenylalkylphosphonic esters or monoesters.