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US 12,467,174 B2Granted
Substituted benzimidazole melt additives
Assignee3M Innovative Properties Company
InventorsFuming B. Li, Nathan E. Schultz, John M. Brandner, John M. Sebastian
Life of this patent
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Abstract
Charged polymeric webs, such as electret webs, include a thermoplastic resin and a charge-enhancing additive. The charge-enhancing additive is a substituted-benzimidazole compound. The electret webs may be a non-woven fibrous web or a film. The electret webs are suitable for use as filter media.
Claims17
An electret web comprising:
- a blend of a thermoplastic resin;
- and
- a charge-enhancing additive comprising substituted-benzimidazole compound with the general structure of Formula 1:
- wherein the groups R1, R2, R3, and R4 independently comprise a hydrogen atom, an alkyl, an aryl, or a substituted alkyl;
- and
- A comprises a substituted or unsubstituted cyclic or heterocyclic 5- or 6-membered aromatic ring group, wherein the blend is processed by melt extrusion.
3 more elements
An electret filter medium comprising:
- a web comprising a blend of:
- a thermoplastic resin;
- and
- a charge-enhancing additive comprising substituted-benzimidazole compound with the general structure of Formula 1:
- wherein the groups R1, R2, R3, and R4 independently comprise a hydrogen atom, an alkyl, an aryl, or a substituted alkyl;
- and
- A comprises a substituted or unsubstituted cyclic or heterocyclic 5- or 6-membered ring group, wherein the blend is processed by melt extrusion.
4 more elements
Dependencies are inferred from the claim text.