Process for obtaining low residual aramid materials
US9580863B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 1, 2013 |
| Grant date | Feb 28, 2017 |
| Priority date | — |
| Expiry date | Jul 22, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P70/62
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The present invention provides for a process for reducing the content of one or more residuals in aramid fibers or filaments, comprising, in this order, the steps of introducing the aramid fiber or filaments into a extraction solution adjusted to a pH ranging from of 2 to 7, adjusting the extraction solution and the aramid fibers or filaments to a temperature of to from 80° C. to 140° C., removing the aramid fibers or filaments from the extraction solution, introducing the aramid fiber or filaments into a first rinsing solution adjusted to a pH ranging from of 2 to 7, optionally comprising a detergent, adjusting the first rinsing solution and the aramid fibers and filaments to a temperature of from 70° C. to 100° C., removing the aramid fibers or filaments from the first rinsing solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.