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US 10,240,269 B2Granted
Electret webs with charge-enhancing additives
Assignee3M Innovative Properties Company
InventorsNathan E. Schultz, Fuming B. Li, John M. Sebastian
Life of this patent
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Abstract
Electret webs include a thermoplastic resin and a charge-enhancing additive. The charge-enhancing additive is a fused aromatic thiourea, a fused aromatic urea compound, or a combination thereof. The change-enhancing additive may also include a hindered amine light stabilizer compound. The electret webs may be a non-woven fibrous web or a film. The electret webs are suitable for use as filter media.
Claims22
An electret web comprising:
- a thermoplastic resin;
- and
- a charge-enhancing additive comprising a fused aromatic thiourea, a fused aromatic urea compound, or a combination thereof.
An electret filter medium comprising:
- a web comprising:
- a thermoplastic resin;
- and
- a charge-enhancing additive comprising a fused aromatic thiourea, a fused aromatic urea compound, or a combination thereof.
1 more element
Dependencies are inferred from the claim text.