Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Rod – strand – filament or fiber
Reexamination Certificate
2006-05-09
2006-05-09
Edwards, N. (Department: 1774)
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Rod, strand, filament or fiber
C428S394000
Reexamination Certificate
active
07041368
ABSTRACT:
Improvements in permitting greater efficiency for high denier polypropylene fiber and yarn production are provided. Generally, spinning speeds are limited for polypropylene fibers and yarns as such materials tend to break easily upon exposure to excessively high tensions associated with low- to medium-spinning speeds. As spinning is required to properly draw such high denier fibers sufficiently for fiber and yarn production, such limitations effectively prevent widespread utilization of such fibers and yarns in various end-use applications. Thus, it has been surprisingly been determined that such high denier manufactured fibers and yarns can be produced with certain nucleating additives that permit tensile strength increases to the level required for high-speed spinning procedures to be followed. Additionally, low-shrink and/or better resiliency properties are also available with the addition of such nucleating compounds within the target high denier polypropylene resins.
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Cowan Martin E.
Morin Brian G.
Edwards N.
Milliken & Company
Moyer Terry T.
Vick, Jr. John E.
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