Substituted thiol melt additives
US11982031B2 · kind B2 · utility
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53References
17Claims
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Key dates
| Filing date | Jan 20, 2021 |
| Grant date | May 14, 2024 |
| Priority date | — |
| Expiry date | Jan 20, 2041 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD06M10/025
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Charged polymeric webs, such as electret webs, include a thermoplastic resin and a charge-enhancing additive. The additives are substituted heterocyclic thiols. The heterocyclic thiol 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.