申请人:The B. F. Goodrich Company
公开号:US04466916A1
公开(公告)日:1984-08-21
Novel polysubstituted 2-keto-1,4-diazacycloalkanes are powerful stabilizers for materials subject to ultraviolet (UV) light degradation, particularly for polyolefins. The cyclic 2-keto compounds of this invention have (a) a fixed two-carbon bridge between the N.sup.1 and N.sup.4 atoms of the diaza ring, the remaining portion of the ring having a variable length bridge of two or more carbon atoms, (b) and N-adjacent carbonyl in the fixed two-carbon bridge, and (c) at least one N.sup.4 -adjacent carbon atom of the diaza ring is polysubstituted, that is, has two substituents which may be cyclizable. Compositions containing (a) the polysubstituted 2-keto-1,4-diazacycloalkanes of this invention, and (b) prior art polysubstituted 2-keto-1,4-diazacycloalkanes, exhibit excellent stability to UV light.
新型多取代2-酮-1,4-二氮杂环烷是对于受紫外(UV)光降解的材料具有强大的稳定剂,特别是对于聚烯烃。本发明的环状2-酮化合物具有:(a)在二氮杂环烷的N.sup.1和N.sup.4原子之间有一个固定的两碳桥,环的其余部分具有两个或更多碳原子的可变长度桥,(b)固定的两碳桥中有一个N-邻接的羰基,以及(c)至少有一个二氮杂环烷的N.sup.4-邻接碳原子是多取代的,即具有可以环化的两个取代基。含有(a)本发明的多取代2-酮-1,4-二氮杂环烷,以及(b)先前的多取代2-酮-1,4-二氮杂环烷的组合物,表现出对UV光的优异稳定性。