Substituted thiolate salt melt additives
Assignee3M Innovative Properties Company
InventorsFuming B. Li, Duane D. Fansler, Anthony F. Schultz, John M. Brandner, Nathan E. Schultz, John M. Sebastian
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Abstract
Charged polymeric webs, such as electret webs, include a thermoplastic resin and a charge-enhancing additive. The additives are substituted heterocyclic thiolate salts. The heterocyclic thiolate salt has 2 nitrogen groups and a third group that may be an NH, N—NH2, O, or S group. The substituent group is an aromatic or heterocyclic aromatic group. The electret webs may be a non-woven fibrous web or a film. The electret webs are suitable for use as filter media.
Claims19
An electret web comprising:
- a thermoplastic resin;
- and
- a charge-enhancing additive comprising a substituted heterocyclic thiolate salt with the structure of Formula 3:
- wherein X comprises an NH, N—NH2, O, or S group;
- and
- A comprises an aromatic or heterocyclic aromatic group of the general Formula 2:
- wherein R1, R2, R3, and R4 independently comprise a hydrogen atom, an alkyl, an aryl, an alkoxy, or a substituted alkyl;
- and
- Y is a C—R5 group or a nitrogen atom, where R5 is a hydrogen atom, an alkyl, an aryl, an alkoxy, or a substituted alkyl group.
An electret filter medium comprising:
- a web comprising:
- a thermoplastic resin;
- and
- at least one charge-enhancing additive comprising a substituted heterocyclic thiolate salt with the general structure of Formula 3:
- wherein X comprises an NH, N—NH2, O, or S group;
- and
- A comprises an aromatic or heterocyclic aromatic group of the general Formula 2:
- wherein R1, R2, R3, and R4 independently comprise a hydrogen atom, an alkyl, an aryl, an alkoxy, or a substituted alkyl;
- and
- Y is a C—R5 group or a nitrogen atom, where R5 is a hydrogen atom, an alkyl, an aryl, an alkoxy, or a substituted alkyl group.
Dependencies are inferred from the claim text.