SPANDEX FILAMENTS

摘要

Segmented elastomeric polyester polyurethaneurea spandex filaments having improved resistance to degradation by ultraviolet radiation and chlorine-containing bleaches in which the hard segments contain ureylene groups joined to functionally non-aromatic radicals, at least 25 mole percent of which are ARE PROVIDED AS WELL AS A PROCESS FOR PREPARING THEM FROM A POLYMER FORMED FROM A POLYESTER GLYCOL, A FUNCTIONALLY NON-AROMATIC DIISOCYANATE AND A FUNCTIONALLY NON-AROMATIC DIAMINE. A sufficient amount of the diisocyanate and/or diamine having the structure WHEREIN R is -NCO or -NH2 is reacted to provide at least 25 mole percent of the sum of the diisocyanate and diamine residues in the hard segment with the structure