Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Rod – strand – filament or fiber
Patent
1998-03-31
2000-05-23
Kynski, William
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Rod, strand, filament or fiber
428375, 428378, 428392, 385100, 385103, 385113, 385123, G02B 600, H04B 1012
Patent
active
060663979
ABSTRACT:
A filler rod for occupying space in a stranded optical fiber communications cable having at least one buffer tube containing at least one optical fiber is disclosed. The filler rod comprises an elongated rod extruded from a polypropylene homopolymer, a polypropylene-polyethylene copolymer (i-PP) resin material, or preferably, from a polypropylene-polyethylene copolymer having a nucleating agent disbursed therein. The resin material is foamed during extrusion so as to have a plurality of void spaces therein and a relative density which is less than 1 relative to the unfoamed resin material. As compared to rods made from high density polyethylene, the i-PP filler rods show a greater foaming efficiency, more efficient use of material, an improved combination of mechanical properties and density, reduced post-extrusion shrinkage and a substantial reduction in the sticking of the filler rods to the outer jacket that is experienced with high density polyethylene filler rods.
REFERENCES:
patent: 4550976 (1985-11-01), Cooper et al.
patent: 5574816 (1996-11-01), Yang et al.
patent: 5615293 (1997-03-01), Sayegh
patent: 5675686 (1997-10-01), Rosenmayer et al.
patent: 5911023 (1999-06-01), Risch et al.
Holder James D.
Risch Brian G.
Alcatel
Gray J. M.
Kynski William
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