Textiles: spinning – twisting – and twining – Strand structure – Staple fiber blends
Reexamination Certificate
2009-06-02
2011-12-06
Hurley, Shaun R (Department: 3765)
Textiles: spinning, twisting, and twining
Strand structure
Staple fiber blends
Reexamination Certificate
active
08069642
ABSTRACT:
A yarn, fabric, and garment suitable for use in arc and flame protection and having improved flash fire protection, consisting essentially of (a) 50 to 60 weight percent meta-aramid fiber having a degree of crystallinity of at least 20%; (b) 31 to 39 weight percent modacrylic fiber; and (c) 5 to 15 weight percent para-aramid fiber; said percentages on the basis of components (a), (b), and (c). In some embodiments, 1 to 3 weight percent of the meta-aramid fiber is replaced with an antistatic fiber comprising carbon or metal with the proviso that at least 50 weight percent meta-aramid fiber is maintained. Garments made from the yarns provide thermal protection such that a wearer would experience less than a 65 percent predicted body burn when exposed to a flash fire exposure of 4 seconds per ASTM F1930, while maintaining a Category 2 arc rating per ASTM F1959 and NFPA 70E.
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E.I. du Pont de Nemours and Company
Hurley Shaun R
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