Fusion free hydrolysis of polyphosphoric acid in spun multifilament yarns
US8202965B2 · kind B2 · utility
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39References
19Claims
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Key dates
| Filing date | Mar 27, 2006 |
| Grant date | Jun 19, 2012 |
| Priority date | — |
| Expiry date | Sep 17, 2027 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01F6/74
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The invention concerns processes for hydrolyzing polyphosphoric acid in a never-dried spun multifilament yarn, comprising: a) removing surface liquid from filaments in a never-dried spun multifilament yarn; and b) contacting the yarn with a hot surface to hydrolyze polyphosphoric acid, wherein the filaments remain substantially unfused; wherein the hot surface has a surface temperature of at least about 150° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.