| 摘要 |
PROBLEM TO BE SOLVED: To provide an electret material having a high trapped electric charge at a high-temperature side, stably retaining the charge for a long time and having excellent heat resistance and colorability. SOLUTION: This heat-resistant electret material comprises at least one kind selected from a hindered amine-based, nitrogen-containing hindered phenol- based, metallic-salt hindered phenol-based, phenolic, hindered phenol-based and phenolic sulfur weatherability improving agent in an amount of 0.01-10 pts.wt. based on 100 pts.wt. of a high-molecular-weight polymer. The weatherability improving agent is prepared by formulating an alkylphosphinic acid compound represented by general formula (1) or (2) (wherein, R<1> and R<2> denote each an organic group or a halogen atom; m and n denote each an integer of 0-4; the R<1> and R<2> may be same or different when the m or n is an integer of 2-4; and A is a same or different organic group from the R<1> and R<2> ) and a fatty acid metallic salt in an amount of 0.01-10 pts.wt. based on 1 pt.wt. thereof. |
