Patent ID: 6495075
Filing Date: 2002-12-17
Classification: D01F

Abstract:
Process for preparing thermoplastic fibers by melt-spinning an alternating copolymer composed of alkenes and carbon monoxide, the process comprising: spinning the alternating copolymer at a spinning temperature of at least TNF+5Â° C., with TNF being the temperature at which the alternating copolymer is free of crystallisation nuclei, to form the thermoplastic fibers, wherein a residence time of the alternating copolymer at a single temperature or different temperatures above the melting point of the alternating copolymer satisfies: &Sum;n=1âˆž&it;tn&CenterDot;exp&it;â€ƒ&it;(A+BTn)&leq;1wherein tn is a residence time (in minutes) of the alternating copolymer at a temperature Tn (in K, with Tn>Tm, with Tm being the melting point of the alternating copolymer) and A and B are determined by measuring a viscosity of the alternating copolymer at different temperatures and residence times.