Invention Grant
- Patent Title: Process for making a yarn having improved strength retention and yarn made thereby
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Application No.: US14804439Application Date: 2015-07-21
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Publication No.: US09752256B2Publication Date: 2017-09-05
- Inventor: Mehdi Afshari , Walter Randall Hall, III
- Applicant: E I DU PONT DE NEMOURS AND COMPANY
- Applicant Address: US DE Wilmington
- Assignee: E I DU PONT DE NEMOURS AND COMPANY
- Current Assignee: E I DU PONT DE NEMOURS AND COMPANY
- Current Assignee Address: US DE Wilmington
- Main IPC: D01D5/06
- IPC: D01D5/06 ; D01D10/02 ; D02G3/02 ; D01F6/60 ; D01D10/06

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.
Public/Granted literature
- US20160032492A1 PROCESS FOR MAKING A YARN HAVING IMPROVED STRENGTH RETENTION AND YARN MADE THEREBY Public/Granted day:2016-02-04
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