POLYURETHANEUREA ELASTIC FIBER

摘要

This invention relates to a polyurethaneurea elastic fiber of which the weatherability is excellent and the preparing method thereof. The invention prepares the polyurethaneurea elastic fiber by adding the formamidine type ultraviolet absorber of formula I to the spinning dope and the strength maintenance rate of the polyurethaneurea elastic fiber is over 90 % after being left for 24 hours at the Fade-O-Meter in which the sunshine carbon arc is installed, wherein, R1 and R2 represent an each alkyl group of 1 to 5 carbon atoms.