Oily mist resistant electret filter media and method for filtering
AssigneeMinnesota Mining and Manufacturing Company
InventorsMarvin E. Jones, Alan D. Rousseau
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Abstract
An oily mist resistant electret filter media is provided. The filter media includes polypropylene electret fibers and a melt processable fluorochemical additive. The additive has a melt temperature of at least 25.degree. C. and a molecular weight of about 500 to 2500. Also provided is a method for filtering particulate material from air containing oily aerosol particles.
Claims20
An oily mist resistant electret filter media comprising melt blown polypropylene electret microfibers and a melt processable fluorochemical additive compound having a melting point of at least about 25.degree. C. and a molecular weight of about 500 to 2500 present in an amount of about 0.2 to 10 weight percent to achieve sustained electret filtration enhancement.
A method for filtering particulate material from air containing oily aerosol particles comprising passing said air through electret filter media comprising polypropylene melt blown microfibers and a melt processable fluorochemical additive, said additive having a melting point of at least 25.degree. C. and a molecular weight of about 500 to 2500 present in an amount of about 0.2 to 10 weight percent to achieve sustained electret filtration enhancement.
Dependencies are inferred from the claim text.