Stabilizers for synthetic polymers
US3993655A · kind A · utility
35Cited by
2References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 21, 1974 |
| Grant date | Nov 23, 1976 |
| Priority date | — |
| Expiry date | Nov 21, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D211/94
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Esters of 2,2,6,6-tetramethylpiperidinols with mono- or bis-hydroxybenzylmalonic acids are powerful stabilizers for organic polymers, especially for polyolefins. They protect the polymers against thermal-oxidative degradation as well as against light-induced aging. Similar activity show the corresponding amides of hydroxybenzylmalonic acids. The esters and the amides can be prepared by analogous processes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.