| abstract |
Alkyl alkanoate derivatives of substituted piperazinediones are stabilizers for synthetic polymeric materials normally subject to deterioration caused by ultraviolet light. The compounds may be formed by reacting a substituted piperazinedione with an acrylate or a crotonate, or reacting the alkali or alkaline earth salt of a substituted piperazine dione with a haloalkanoate. Polymeric compositions containing these stabilizers may be also contain a hindered phenolic compound. A typical embodiment is n-octadecylBeta -(15(7,15-diazadispiro(5,1,5,3)hexadecane-14,16dione)propionate. |