Alkyl alkanoate derivatives of substituted piperazine-diones and polymer compositions stabilized thereby
AssigneeCiba-Geigy Corporation
InventorsChester E. Ramey, John J. Luzzi
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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 7,15-diazadispiro[containing these stabilizers may also contain a hindered phenolic compound. A typical embodiment is n-octadecyl-.beta.-(15{7,15-diazadispiro[5,1,5,3]hexadecane-14,16-dione}pr opionate.
Claims13
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 2;
- when n is 1, R.sup.3 is alkyl of from 1 to 20 carbon atoms;
- when n is 2, R.sup.3 is alkylene of from 2 to 8 carbon atoms;
- and
- A is a straight or branched chained (lower) alkylene group having from 1 to 6 carbon atoms with the limitation that the terminals of said alkylene group bear only hydrogen or one (lower)alkyl group.
Dependencies are inferred from the claim text.