Patent · US Expired

N-hydrocarbyloxy hindered amine light stabilizers with phosphorus moieties

US5021481A · kind A · utility

12Cited by
4References
39Claims
0Family size

Assignee

Inventors

Key dates

Filing dateFeb 14, 1990
Grant dateJun 4, 1991
Priority date
Expiry dateFeb 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.