Filtration materials using fiber blends that contain strategically shaped fibers and/or charge control agents
US9618220B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 24, 2014 |
| Grant date | Apr 11, 2017 |
| Priority date | — |
| Expiry date | Jul 16, 2035 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF24F8/10
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A filtration material comprising a blend of polypropylene and acrylic fibers of round, flat, dog bone, oval or kidney bean shape in any size from 0.08 to 3.3 Dtex. A preferred blend contains about 50 weight percent polypropylene fibers and about 50 weight percent acrylic fibers. The fibers can be blended ranging from 90:10 to 10:90 polypropylene to acrylic. The shape contains 25 weight percent round, flat, oval, dog bone and kidney bean shapes. The fiber blend contains 25 weight percent of at least one size between 0.08 and 3.3 Dtex. Electret fibers incorporated within these blends have 0.02 to 33 weight percent of a charge control agent. These fibers can be used in producing electret material by corona or triboelectric charging methods.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.