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US 6,808,551 B2Granted
Method of using fluorinated electrets
Assignee3M Innovative Properties Company
InventorsMarvin E. Jones, Christopher S. Lyons, David B. Redmond, Jeffrey L. Solomon, Seyed Abolhassan Angadjivand
Life of this patent
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Abstract
An electret is described that includes a surface modified polymeric article having surface fluorination produced by fluorinating the polymeric article.
Claims37
A method of filtering contaminants, said method comprising:
- passing an aerosol through a plasma surface modified nonwoven polymeric web electret to remove contaminants from the aerosol,
- the nonwoven polymeric web comprising plasma surface fluorination, the electret, when tested according to the Initial DOP Penetration Test and the DOP Loading Test prior to contact with the aerosol, exhibiting a DOP penetration of less than 20% for a DOP load from 0.05 grams to 0.2 grams.
A method of filtering contaminants, said method comprising:
- passing an aerosol through an electret to remove contaminants from the aerosol,
- the electret comprising a nonwoven polymeric web comprising at least about 45 atomic % fluorine as detected by ESCA and a CF3:CF2 ratio of at least about 0.45 as determined according to the Method of Determining CF3:CF2,
- the electret having a Quality Factor of at least about 0.25/mmH2O prior to contact with the aerosol.
A method of filtering contaminants, said method comprising:
- passing an aerosol through an electret to remove contaminants from the aerosol,
- the electret comprising a nonwoven polymeric web comprising at least about 50 atomic % fluorine as detected by ESCA and a CF3:CF2 ratio of at least about 0.25 as determined according to the Method for Determining CF3:CF2,
- the electret having a quality factor of at least about 0.25/mmH2O prior to contact with the aerosol.
A method of filtering contaminants, said method comprising:
- passing an aerosol through an electret to remove contaminants from the aerosol,
- the electret comprising a nonwoven polymeric web comprising microfibers, the web having surface fluorination that comprises CF3 and CF2 at a CF3:CF2 ratio of at least 0.45 as determined according to the Method for Determining CF3:CF2,
- the electret having a quality factor of at least about 0.25/mmH2O prior to contact with the aerosol.
Dependencies are inferred from the claim text.