Method of making electret fibers that have low level of extractable hydrocarbon material
US6319452A · kind A · utility
3Cited by
27References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 18, 2000 |
| Grant date | Nov 20, 2001 |
| Priority date | — |
| Expiry date | Jan 18, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2239/1291
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method of making electret fibers, which method comprises the steps of: PA1 blending a polymeric material with a fluorochemical additive compound; PA1 extruding the blend at a temperature maintained below 290.degree. C. to form extruded fibers; and PA1 annealing and charging the extruded fibers; PA1 wherein the polymeric material and extrusion conditions are selected such that the resulting fibers have a level of extractable hydrocarbon material that is less than about 3.0 weight percent based on the weight of the fibers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.