Fibers melt-spun from a thermoplastic alternating copolymer and a process for preparing such fibers

摘要

Fibers melt-spun from a thermoplastic alternating copolymer composed of alkenes and carbon monoxide have a ;tenacity BT900 mN/tex, ;melting point Tm220° C., ;crystallinity Vc33%, and ;birefringence &Dgr;n0.0550. ;These fibers are prepared by melt-spinning the copolymer and then drawing the resulting fibers, the spinning process being conducted using a polymer melt free of crystallization nuclei at a temperature of at most 40 K above the melting temperature of the polymer T_m(in K) and the drawing of the fibers being conducted at a temperature in the range of T_mc−15 K to T_mc−90 K, with T_mc representing the constrained melting temperature, at a draw ratio in the range of 5 to 12 and a drawing tension corrected for temperature DT_d.corr. in the range of 105 to 300 mN/tex. The fibers are pre-eminently suitable for use as reinforcing yarn in rubber articles such as car tires.