3,5-Dialkyl-4-hydroxyphenylalkyl substituted piperazine diones and polymeric compositions stabilized thereby
US3969316A · kind A · utility
5Cited by
1References
5Claims
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Key dates
| Filing date | Oct 15, 1975 |
| Grant date | Jul 13, 1976 |
| Priority date | — |
| Expiry date | Oct 15, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/3462
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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-hydroxyphenylalkyl 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).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.