ELECTRET, FILTER FOR CLEANING AIR AND METHODS FOR PRODUCING THEM

摘要

PROBLEM TO BE SOLVED: To provide an electret which exhibits an excellent performance on the collection of one polarity-charged particles such as toner particles, and to provide a filter for cleaning a gas. SOLUTION: (A) An electret comprising two or more fibers and having an absolute electrostatic charge quantity of≥1.0×10-8coulomb/g. (B) An electret filter according to (A), wherein the electric filter is produced by frictional electrification. (C) An electret according to (A) or (B), wherein polyolefin-based fibers are used. (D) A gas-cleaning filter is characterized in that a sheet containing the electret according to either of (A) to (C) is formed in a pleat-like or wavy shape. COPYRIGHT: (C)2006,JPO&NCIPI