Substituted piperazine diones and polymeric compositions stabilized thereby
AssigneeCiba-Geigy Corporation
InventorsChester E. Ramey, John J. Luzzi
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Abstract
Substituted piperazine diones are stabilizers for synthetic polymeric materials normally subject to deterioration caused by ultraviolet light. The compounds are prepared by the alkylation reaction between a substituted piperazine dione and an organic halide. Polymeric compositions containing these stabilizers may also contain a hindered phenolic compound. A typical embodiment is 15,15'-dodecamethylenebis(7,15-diazadispiro[5,1,5,3]hexadecane-14,16-dione ).
Claims1
A compound of the formula ##STR14## wherein R.sup.1 and R.sup.2 are together with the carbon to which they are bound form a cyclopentyl or cyclohexyl ring, which is unsubstituted or substituted with a methyl group, and
- R.sup.3 is benzyl.
Dependencies are inferred from the claim text.