Melt-spinning polyesters with stress isolation after quenching

Details Melt-spinning polyesters with stress isolation after quenching Melt-spinning polyesters with stress isolation after quenching

D - Textiles, Paper

02

J

18/624

D02J 13/00 (2006.01) D01F 6/62 (2006.01)

Patent

CA 1096118

PRODUCTION OF IMPROVED POLYESTER FILAMENTS OF HIGH STRENGTH POSSESSING AN UNUSUALLY STABLE INTERNAL STRUCTURE ABSTRACT OF THE DISCLOSURE An improved process is provided for the formation of a high perform- ance polyester (at least 85 mol percent polyethylene terephthalate) multi- filament yarn. The product possesses a high strength (at least 7.5 grams per denier) and an unusually stable internal structure which renders it par- ticularly suited for use in industrial applications at elevated temperatures. The filaments are melt spun and uniformly quenched under relatively high stress conditions (as described) to yield an as-spun filamentary material of relatively high birefringence (+9 x 10-3 to +70 x 10-3) which is passed in- line from the quench zone to a first draw zone where it is drawn at a draw ratio of 1.01:1 to 3.0:1, and subsequently is drawn (as described) to achieve at least 85 percent of the maximum draw ratio of the as-spun filamentary mate- rial. The resulting filamentary material exhibits unusually low shrinkage and hysteresis characteristics (i.e. work loss characteristics) as well as the high strength characteristics. Accordingly, when utilized in the forma- tion of a tire cord and embedded in a rubber matrix a highly stable tire may be formed which exhibits a significantly lesser heat generation upon flexing.

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