According to the invention there are obtained modified polyurethanes which have a durable, wash-fast, acid-resistant, cleaning-resistant and solvent-resistant stabilization on the basis of 2,2,6,6-tetraalkyl-piperidine light protective agents. The stabilizers are integral constituents of the polyurethanes, that is to say they are built into the polyurethane chain by a chain lengthening reaction in which two H-active reactive groups (preferably from the series of primary or secondary amino groups, carboxylic acid hydrazide, carbazic ester or semicarbazide groups) of a 2,2,6,6-tetraalkyl piperidine derivative react with isocyanate groups of polyisocyanates or isocyanate prepolymers, optionally in the presence of the usual chain lengthening agents.
根据本发明,基于2,2,6,6-四烷基
哌啶光保护剂,通过链延伸反应,将两个H活性反应基(优选为一级或二级
氨基、
羧酸肼、
氨基
脲酯或半
脲酸基)的2,2,6,6-四烷基
哌啶衍
生物与聚
异氰酸酯或
异氰酸酯预聚物的
异氰酸酯基反应,可选地在通常的链延伸剂的存在下,得到改性聚
氨酯。该稳定剂是聚
氨酯的组成部分,即它们被内置于聚
氨酯链中,具有耐久、耐洗涤、耐酸、耐清洁和耐溶剂的稳定性。