Substituted malonic acid derivatives and their use as stabilizers
US4198334A · kind A · utility
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21Claims
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Key dates
| Filing date | Dec 15, 1977 |
| Grant date | Apr 15, 1980 |
| Priority date | — |
| Expiry date | Dec 15, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/005
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Esters and amides from 4-hydroxy-and 4-amino-polyalkylpiperidines and hydroxybenzylmalonic acids substituted at the central carbon atom with an organic residue, preferably alkyl-, esteralkyl- or phosphonoalkyl-groups, are excellent stabilizers for organic polymers, especially for polyolefins. They protect the polymers as well against light degradation as against thermo-oxidative degradation. The compounds can be prepared by hydroxybenzylation of the corresponding derivatives of substituted malonic acids. Bis-malonic acid derivatives may be obtained from the monomalonics by reaction with formaldehyde.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.