| abstract |
The present invention discloses an electret comprising a surface modified polymer article having a fluorinated surface made by fluorinating a polymeric article. This electret may be a nonwoven fibrous web comprising electrically charged microfibers, wherein the web has a degree of fluorination comprising CF 3 and CF 2 groups on the surface of the fiber in a CF 3 : CF 2 ratio of at least 0.45.n n n n Electret, fluorinated, fluorinated surface, nonwoven fibrous web, CF3: CF2 ratio |