Electret sheet and a method for the production of the same
AssigneeToyo Boseki Kabushiki Kaisha
InventorsYatsuhiro Tani, Satoshi Takase
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Abstract
An electret sheet comprises a porous sheet made of a dielectric polymer and at least one solid material selected from the group consisting of organic materials, inorganic materials, and metallic materials, the porous sheet having the material spaced at various intervals and a method for the manufacture of the said electret sheet.
Claims6
An electret sheet comprising a porous sheet made of a dielectric polymer and at least one solid material selected from the group consisting of (1) organic materials that are solid at room temperature and consist of organic carboxylic acids, metal salts of organic carboxylic acids, polyethylene, polypropylene, polyethylene terephthalate, polyamide, polyvinylidene fluoride, polytetrafluoroethylene, polystyrene, polyvinyl chloride, polyvinylidene chloride, cellulose, or polyvinyl alcohol;
- (2) inorganic materials that are ceramics, metal nitrides, or carbon black;
- and (3) metallic materials that consist of aluminum, silver, tin, nickel, or copper, said porous sheet having said material in particulate form spaced at various intervals on the surface of the dielectric polymer, wherein said sheet having the material in particulate form on the surface thereof has been electrified while said material in particulate form is present.
Dependencies are inferred from the claim text.