Cyclic anhydride derivatives of hydrazide functionalized hindered amine light stabilizers
US4824884A · kind A · utility
13Cited by
31References
23Claims
0Family size
Assignee
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Key dates
| Filing date | Aug 12, 1987 |
| Grant date | Apr 25, 1989 |
| Priority date | — |
| Expiry date | Aug 12, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/3435
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Amic acids, cyclic imides and mixtures thereof which contain both diacyl hydrazide functionalities and hindered amine functionalities are prepared by reacting non-halogenated cyclic anhydrides with hindered amine light stabilizers containing reactive hydrazido funtionalities in inert solvents or in inert polymeric compositions in a melt blending step. The compositions protect polymeric compositions against the degradative effects of heat and light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.