A hydroxyphenyl-benzotriazole bisurea UV light stabilizer for organic polymers and a process for making it are provided. The stabilizer is particularly useful for spandex polymer yarns that are subjected to solvent scouring. A preferred stabilizer of the invention is a bisurea formed by reacting methylene- bis(4-phenyl-isocyanate) with 2-[2-hydroxy-3-(1,1-dimethylethyl)-5-(N-aminoethyl)propionamid-phenyl]-2H-benzotriazole.
                            本发明提供了一种用于有机聚合物的羟苯基-苯并三唑比索拉紫外线稳定剂及其制造工艺。这种稳定剂特别适用于需要经受溶剂冲刷的
氨纶聚合物纱线。本发明的一种优选稳定剂是通过亚甲基-双(4-苯基-
异氰酸酯)与 2-[2-羟基-3-(
1,1-二甲基乙基)-5-(N-
氨基乙基)丙酰胺-苯基]-2H-苯并三唑反应而形成的一种 bisurea。