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.
根据这项发明,利用基于2,2,6,6-四烷基哌啶光保护剂的改性聚氨酯,其具有耐久、耐洗、耐酸、耐清洁和耐溶剂的稳定性。稳定剂是聚氨酯的组成部分,也就是说,它们通过链延长反应内置于聚氨酯链中,其中2,2,6,6-四烷基哌啶衍生物的两个H活性反应基团(优选为一系列原始或次要氨基、羧酸肼、卡巴酸酯或半卡巴酸基团中的一种)与聚异氰酸酯或异氰酸酯预聚物的异氰酸酯基团反应,可选地在常规链延长剂的存在下进行。