申请人:Bayer Aktiengesellschaft
公开号:US04145512A1
公开(公告)日:1979-03-20
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。