N-hydrocarbyloxy hindered amine light stabilizers with phosphorus moieties
US5021481A · kind A · utility
12Cited by
4References
39Claims
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Key dates
| Filing date | Feb 14, 1990 |
| Grant date | Jun 4, 1991 |
| Priority date | — |
| Expiry date | Feb 14, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/5399
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
N-Hydrocarbyloxy derivatives of phosphorus substituted 4-amino- and 4-hydroxy-2,2,6,6-tetramethylpiperidine are effective light stabilizers for polymer compositions. These phosphorus compounds include phosphites and cyclic phosphites such as 1,3,2-dioxaphospholanes, 1,3,2-dioxaphosphorinanes, 1,3,2-oxazaphospholidines, 1,3,2-diazaphospholidines, 1,3,2-dioxaphosphocins, 1,3,2-dioxaphosphepins and 2,4,8,10-tertraoxa-3,9-diphosphaspiro[5,5]-undecanes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.