申请人:The B. F. Goodrich Company
公开号:US04207228A1
公开(公告)日:1980-06-10
Novel polysubstituted 1,5-diazacycloalkanes and polysubstituted 2-keto-1,5-diazacycloalkanes are powerful stabilizers for materials subject to ultraviolet (UV) light degradation, particularly for polyolefins. The cyclic compounds of this invention have (a) a fixed three-carbon bridge between the N.sup.1 and N.sup.5 atoms of the diaza ring, the remaining portion of the ring having a variable length bridge of two or more carbon atoms, (b) an N-adjacent carbon atom of the diaza ring is polysubstituted, that is, has two substituents which may be cyclizable. Compositions containing (a) the polysubstituted 1,5-diazacycloalkanes and polysubstituted 2-keto-1,5-diazacycloalkanes of this invention, and (b) prior art polysubstituted 1,5-diazacycloalkanes and polysubstituted 2-keto-1,5-diazacycloalkanes, exhibit excellent stability to UV light. A novel synthesis for preparing polysubstituted 2-keto-1,5-diazacycloalkanes is disclosed.
新型多取代1,5-二氮杂环烷和多取代2-酮基-1,5-二氮杂环烷是对受紫外光降解影响的材料具有强大稳定作用的稳定剂,特别适用于聚烯烃。本发明的环状化合物具有以下特征:(a)在二氮杂环的N.sup.1和N.sup.5原子之间有一个固定的三碳桥,环的其余部分具有长度可变的两个或更多碳原子的桥,(b)二氮杂环的N-邻近碳原子是多取代的,即具有两个可能可环化的取代基。含有本发明的多取代1,5-二氮杂环烷和多取代2-酮基-1,5-二氮杂环烷以及(b)现有技术的多取代1,5-二氮杂环烷和多取代2-酮基-1,5-二氮杂环烷的组合物,对紫外光具有出色的稳定性。还公开了一种制备多取代2-酮基-1,5-二氮杂环烷的新型合成方法。