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US 12,760,168 B2Granted
Dual-function melt additives
Assignee3M Innovative Properties Company
InventorsFuming B. Li, Nathan E. Schultz, John M. Brandner
Life of this patent
Estimating the term…
Abstract
Charged polymeric webs, such as electret webs, include a thermoplastic resin and a charge-enhancing additive. The charge-enhancing additive is a dual-function charge-enhancing additive that enhances the charge of the electret and also has anti-microbial properties. The additives are substituted-benzimidazole or substituted-benzothiazole compounds. The electret webs may be a non-woven fibrous web or a film. The electret webs are suitable for use as filter media.
Claims15
An electret web consisting of:
- a thermoplastic resin consisting of polyolefin;
- polyvinyl chloride;
- polystyrene;
- polycarbonate;
- or polyester;
- and
- a charge-enhancing additive consisting of substituted-benzimidazole compound with
- the general structure of Formula 1:
- wherein the Y is an NH or S group;
- the groups R1, R2, R3, and R4 independently are a hydrogen atom, an alkyl, an aryl, or a substituted alkyl;
- and
- A is a substituted 6-membered aromatic group or a substituted or unsubstituted heterocyclic aromatic 6-membered ring group;
- and
- wherein the electret web has anti-microbial properties.
11 more elements
An electret filter medium consisting of:
- a web consisting of:
- a thermoplastic resin consisting of polyolefin;
- polyvinyl chloride;
- polystyrene;
- polycarbonate;
- or polyester;
- and
- a charge-enhancing additive consisting of a substituted-benzimidazole compound with the general structure of Formula 1:
- wherein the Y is an NH or S group;
- the groups R1, R2, R3, and R4 each independently is a hydrogen atom, an alkyl, an aryl, or a substituted alkyl;
- and
- A is a substituted 6-membered aromatic group or a substituted or unsubstituted heterocyclic aromatic 6-membered ring group;
- and
- wherein the electret filter media has anti-microbial properties.
11 more elements
Dependencies are inferred from the claim text.