Patents Represented by Attorney Nester W. Shust

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  • 3,5-Dialkyl-4-hydroxyphenylalkyl substituted piperazine diones and polymeric compositions stabilized thereby
    Patent number: 4070335
    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).
    Type: Grant
    Filed: July 2, 1976
    Date of Patent: January 24, 1978
    Assignee: Ciba-Geigy Corporation
    Inventors: Chester E. Ramey, John J. Luzzi