Process for the preparation of novel light stabilizers
US4461898A · kind A · utility
5Cited by
2References
5Claims
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Key dates
| Filing date | Nov 1, 1982 |
| Grant date | Jul 24, 1984 |
| Priority date | — |
| Expiry date | Nov 1, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/3435
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Mixtures of esters of polyalkylpiperidine derivatives, of the formulae I and II ##STR1## in which the proportions of I to II are 95 to 70% by weight and 5 to 30% by weight, are obtained by reacting about 2 mols of a piperidine of the formula III ##STR2## with 0.9 to 1.3 mols of a diester of the formula IV ##STR3## in the melt at between 100.degree. and 145.degree. C., in the presence of an alkali metal amide as a catalyst. The mixtures of esters thus obtained are very suitable as light stabilizers for plastics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.