Tire cord prepared from high strength polyester filamentary yarn

Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Rod – strand – filament or fiber

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428364, 152451, B32B 2734, D02G 300

Patent

active

056586655

ABSTRACT:
A polyester tire cord is produced from a polyester multi-filamentary yarn having a novel internal microstructure containing crystalline, amorphous and mesomorphous portions which are changed to a definite structure of crystalline and amorphous portions during formation of the tire cord. A polyester resin containing at least 90 mol % polyethylene terephthalate is melt-spun and solidified by quenching to produce an undrawn yarn with a birefringence of 0.03 to 0.08, which is then drawn at a total draw ratio of 1.4:1 to 2.2:1 and thermally treated and relaxed. The resulting filamentary yarn is dipped in a rubber solution to produce a tire cord which exhibits excellent dimensional stability and fatigue resistance when it has been incorporated into a rubber matrix of a tire.

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