3,5-Dialkyl-4-hydroxyphenylalkyl substituted piperazine diones and polymeric compositions stabilized thereby
AssigneeCiba-Geigy Corporation
InventorsChester E. Ramey, John J. Luzzi
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Abstract
3,5-dialkyl-4-hydroxyphenylalkyl 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 3,5-dialkyl-4-hydroxyphenyl-alkyl halide. Polymeric compositions containing these stabilizers may also contain a hindered phenolic compound. A typical embodiment is 15-(3',5'-di-t-butyl-4'-hydroxybenzyl)(7,15-diazadispiro[5,1,5,3]hexadecan e-14,16-dione).
Claims11
A composition of matter stabilized against ultraviolet deterioration which comprises a synthetic organic polymer normally subject to ultraviolet deterioration and from 0.01 to 2% by weight of the polymer of a stabilizing compound of the formula ##STR13## wherein R.sup.1 and R.sup.2 are independently of each other methyl or ethyl or together with the carbon to which they are bound form a cyclopentyl or cyclohexyl ring, which is unsubstituted or substituted with a methyl group;
- n is an integer of from 1 to 4;
- and
- each of R.sup.3 and R.sup.4 is the same or different (lower)alkyl group having from 1 to 8 carbon atoms, wherein at least one of said alkyl groups is branched on the .alpha. carbon atom.
Dependencies are inferred from the claim text.