Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Rod – strand – filament or fiber
Reexamination Certificate
2007-05-08
2007-05-08
Edwards, N. (Department: 1774)
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Rod, strand, filament or fiber
C428S394000, C139S38300A
Reexamination Certificate
active
10961199
ABSTRACT:
In a process for producing fine monofilaments having improved abrasion resistance from a polypropylene having a melt flow index (MFI)230° C./2.16 kgof 2–16 g/10 min at a linear density of 5–20 dtex (0.027 mm–0.053 mm), a compound consisting of 80 to 99.9% by weight of chips and 20 to 0.1% by weight of an additive is added to the extruder, the melt is spun at a speed of at least 1200 m/min, the fibre is cooled in an air bath at room temperature, supplementarily stretched at a temperature of 110–150° C. to a linear density of 5–20 dtex and wound up.The monofilaments comprising a polypropylene having a melt flow index (MFI)230° C./2.16 kgof 2–16 g/10 min, having improved abrasion resistance, and a linear density of 5–20 dtex (0.027 mm–0.053 mm) and an abrasion resistance score ≦2. The monofilaments have a tenacity of at least 48 cN/tex and an elongation at break of less than 45% for a mechanical constant (constante méchanique) of at least 295 cN/tex and a specific work to break value of more than 61.5 cN·cm/dtex.The fine monofilaments according to the invention are useful for producing woven screen fabrics for filtration and screen printing without abrasion deposits.
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Kurt Max
Schütze Gustav
Buchanan & Ingersoll & Rooney PC
Edwards N.
Rhodia Industrial Yarns AG
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