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US 5,472,781 AGranted
High strength polyester filamentary yarn
AssigneeKolon Industries, Inc.
InventorsKyeoghyeon Kim, Hagmug Kim, Seongjung Kim, Sangmin Lee, Hongjo Kim
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AssigneeKolon Industries, Inc.
InventorsKyeoghyeon Kim, Hagmug Kim, Seongjung Kim, Sangmin Lee, Hongjo Kim
Estimating the term…
A polyester multi-filamentary yarn having a novel internal microstructure, polyester tire cord produced from the yarn and a process for production thereof are provided. The polyester yarn has a novel three-phase microstructure consisting of crystalline, amorphous and mesomorphous portions which are changed to a structure having crystalline and amorphous portions during formation of a tire cord. The polyester resin contains at least 90 mol. % polyethylene teraphthalate. The resin is melt-spun and solidified by quenching to produce an undrawn yarn having 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 is incorporated into the rubber matrix of a tire.
A polyester filamentary yarn comprising at least 90 mol. % polyethylene terephalate and having a fineness of 3-5 denier per filament wherein said polyester has a crystalline orientation function (fc) of at most 0.94, percent crystallinity (Xc) of 0.320-0.45, and has a three-phase microstructure consisting of crystalline, amorphous and mesomorphous portions, the proportion of the mesomorphous portion is 5-15 percent based upon the total amount of crystalline, amorphous and mesomorphous portions of said polyester, and wherein the amount of the mesomorphous portion and the total amount of crystalline, amorphous and mesomorphous portions are determined by the equation
A polyester filamentary yarn comprising at least 90 mol % polyethylene therephthalate and having a fineness of 3-5 denier per filament, wherein said yarn is:
A polyester filamentary yarn comprising at least 90 mol % polyethylene therephthalate and having a fineness of 3-5 denier per filament, wherein said yarn has a maximum thermal stress of at most 0.5 g/d in the temperature range of from 60.degree. C. to 250.degree. C. and exhibits decreasing slope above 210.degree. C. in a thermal stress versus temperature curve.
A polyester filamentary yarn comprising at least 90 mol % polyethylene terephthalate and having a fineness of 3-5 denier per filament, wherein said yarn has:
Dependencies are inferred from the claim text.