Process for making a yarn having improved strength retention and yarn made thereby
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United States of America Patent
Stats
-
Sep 5, 2017
Grant Date -
Feb 4, 2016
app pub date -
Jul 21, 2015
filing date -
Jul 31, 2014
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The invention relates to a continuous process for making a yarn comprising filaments of poly (paraphenylene terephthalamide) and the yarn made thereby, the process utilizing a coagulation bath having a temperature of at least 20° C., washing with an aqueous liquid, and drying the filaments under a tension of 0.3 to 1.0 grams per denier wherein the filaments are dried for 0.4 to 0.9 seconds at a temperature of from 250 to 325° C. The yarn has a tenacity of at least 22 gpd, an elongation at break of at least 3.2 percent, and a tensile modulus of from 530 to 700 gpd; the yarn further has a heat-aged strength retention (HASR) of at least 93 percent and the filaments in the yarn have a D110 crystallinity of at least 55 angstroms.
First Claim
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International Classification(s)
- 2015 Application Filing Year
- D01D Class
- 276 Applications Filed
- 191 Patents Issued To-Date
- 69.21 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 0 Citation Count
- D01D Class
- 0 % this patent is cited more than
- 8 Age
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 7.5 Year Payment | $3600.00 | $1800.00 | $900.00 | Mar 5, 2025 |
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Mar 5, 2029 |
