Air filter sheet, process for manufacturing same, and air filter
AssigneeNichias Corporation
InventorsToshiro Nakano, Satoshi Minobe, Takashi Tanahashi
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Abstract
An air filter sheet comprising particles of a functional agent with an average particle diameter of 0.1 to 30 μm and fibrils of a polytetrafluoroethylene resin with a number average molecular weight of 3,000,000 to 50,000,000, the ratio by weight of the functional agent to the fibrils of the polytetrafluoroethylene resin being from 1 to 99. According to the present invention, an air filter sheet comprising fibrils of polytetrafluoroethylene resin with a functional agent carried thereon, possessing excellent formability, and being free from a lubricant, a process for manufacturing the air filter sheet, and an air filter free from contamination of outgas with a lubricant are provided.
Claims6
An air filter sheet comprising particles of a functional agent with an average particle diameter of 0.1 to 30 μm and fibrils of a polytetrafluoroethylene resin with a number average molecular weight of 3,000,000 to 50,000,000, the ratio by weight of the functional agent to the fibrils of the polytetrafluoroethylene resin being from 1 to 99.
A process for manufacturing an air filter sheet comprising a fibrillation step of providing a mixture (A) comprising particles of a functional agent with an average particle diameter of 0.1 to 30 μm and particles of a polytetrafluoroethylene resin with a number average molecular weight of 3,000,000 to 50,000,000 at a ratio by weight of the functional agent to the polytetrafluoroethylene resin particles of 1 to 99 and applying a shearing stress to the component (A) to obtain a mixture (B) of the functional agent and fibrils of the polytetrafluoroethylene resin, and a rolling step of rolling the mixture (B) while applying a sharing stress to obtain the air filter sheet.
Dependencies are inferred from the claim text.