Patent ID: 8776367
Filing Date: 2014-07-15
Classification: H04R,Y10T

Abstract:
1. A method of making an electret film, the method comprising providing a polymer-containing solution, the polymer-containing solution comprising at least one polymer material and at least one surfactant; spreading the polymer-containing solution to provide a wetting polymer film; curing the wetting polymer film to provide a polymer film; and conducting a Corona charging to the polymer film to form a non-fluoropolymer electret film, wherein the at least one surfactant of the polymer-containing solution comprises at least one of (n+1)-hydroxy-alkanoic acid, (n+1)-amino-alkanoic acid, (n+1)-sulfanyl-alkanoic acid, 2-(n-hydroxy-alkyl)malonic acid, 2-(n-mercapto-alkyl)malonic acid, or 2-(n-amino-alkyl)malonic acid, 2,3-bis-(n-hydroxy-alkyloxy)-succinic acid, 2,3-bis-(n-amino-alkyloxy)-succinic acid, (n+1)-triazol-alkanoic acid, 2,3-bis-(n-triazol-alkyloxy)-succinic acid, sodium dodecyl sulfate (SDS), amphoteric surfactants, nonionic surfactants, cationic surfactants, and anionic surfactants.