Process for preparing hindered amine light stabilizers
US5180830A · kind A · utility
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17Claims
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Key dates
| Filing date | Apr 24, 1991 |
| Grant date | Jan 19, 1993 |
| Priority date | — |
| Expiry date | Apr 24, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D211/46
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Disclosed is a process for the preparation of hindered amine light stabilizers by reacting (a) an alkyl substituted-4-hydroxypiperidine with (b) a dicarboxylic acid ester, in the presence of a catalyst system comprising a basic inorganic compound and a polar aprotic organic compound.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.