A water vapor resistant filter comprising a permeable molded material, nonwoven fabric or felt comprising polyimide fiber having a repeating unit represented by formula (I) is described. The permeable molded material, nonwoven fabric or felt is covered with a condensed polycyclic polynucleus aromatic resin, a melting fluorine resin, a solvent-soluble cold setting fluorine resin or a fluorine elastomer:
X, R and n are defined in the specification. A water vapor resistant antistatic filter is also described, which comprises a permeable molded material, nonwoven fabric or felt comprising polyimide fiber having a repeating unit represented by the above-described formula (I). The permeable molded material, nonwoven fabric or felt is covered with an electroconductive material and a condensed polycyclic polynucleus aromatic resin, a solvent-soluble cold setting fluorine resin or a fluorine elastomer. Processes for producing these filters are also described.
本发明描述了一种抗
水蒸气过滤器,它由透气模塑材料、无纺布或毡组成,其中聚
酰亚胺纤维具有由式(I)表示的重复单元。透气模塑材料、无纺布或毡上覆盖有缩聚多环多核芳族
树脂、熔融
氟树脂、溶剂可溶冷固
氟树脂或
氟弹性体:
X、R 和 n 的定义见说明书。此外,还介绍了一种抗
水蒸气抗静电过滤器,它包括由聚
酰亚胺纤维组成的可渗透模制材料、无纺布或毡,聚
酰亚胺纤维具有由上述式(I)表示的重复单元。透气模塑材料、无纺布或毡上覆盖有导电材料和缩聚多环多核芳族
树脂、溶剂型冷固
氟树脂或
氟弹性体。此外,还介绍了生产这些过滤器的工艺。