Hydroxybenzylmalonic acid derivatives
US4148783A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 6, 1976 |
| Grant date | Apr 10, 1979 |
| Priority date | — |
| Expiry date | Dec 6, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/3435
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Hydroxybenzylmalonic acid derivatives of 1-acylpiperidin-4-ols or 1-acyl-4-aminopiperidines respectively having the formula ##STR1## WHEREIN R.sub.a, R.sub.b, R.sub.c, R.sub.d are hydrocarbon residues, R.sub.e is H or lower alkyl, R.sub.1 is a hydroxybenzyl residue, R.sub.2 is H or R.sub.1, X is --O-- or --NH-- and Y is hydrogen, a hydrocarbon, amino, alkoxy or phenoxy residue are excellent stabilizers for plastics material, especially for polyolefins. They act against heat aging as well as against light aging. The compounds may be prepared by acylation of the corresponding NH compounds or by hydroxybenzylation of the corresponding malonic acid derivatives.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.