Patent · US Active

Electret materials

US8415416B2 · kind B2 · utility

10Cited by

6References

22Claims

0Family size

Assignee

BASF SE

Inventors

Hui Chin · Katonah, US
Andrew J. Leggio · Franklin Square, US
Matthew E. Gande · New Fairfield, US
Anthony D. DeBellis · Stony Point, US
Sai P. Shum · Pleasantville, US
Per Magnus Kristiansen · Zürich, CH
Klaus Stoll · Binzen, DE
Hans-Werner Schmidt · Bayreuth, DE
Nils Mohmeyer · Mannheim, DE

Key dates

Filing date	Sep 12, 2012
Grant date	Apr 9, 2013
Priority date	—
Expiry date	Sep 12, 2032

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T442/696
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

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 formulaThe 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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.