Block oligomers containing 1-hydrocarbyloxy-2,2,6,6-tetramethyl-4-piperidyl groups as stabilizers for organic materials
US6403680B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 18, 1999 |
| Grant date | Jun 11, 2002 |
| Priority date | — |
| Expiry date | Nov 18, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/34926
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A product obtained by1) reacting a compound of the formula (&agr;) with a compound of the formula (&bgr;) in a stoichiometric ratio to obtain a compound of the formula (&ggr;) 2) reacting the compound of the formula (&bgr;) with the compound of the formula (&ggr;) in a molar ratio of 0.4:1 to 0.75:1;3) reacting the end groups of the formula (&dgr;) being present in the product of the reaction 2) with e.g. dibutylamine in a molar ratio of 2:1.7 to 2:3; the reactions 1) to 3) being carried out in an organic solvent in the presence of an inorganic base; and4) transferring the groups of the formula being present in the product of the reaction 3) to groups of the formula said transfer being carried out by reacting the product of the reaction 3) with a hydroperoxide in a hydrocarbon solvent in the presence of a peroxide decomposing catalyst; R1 is in particular a hydrocarbyl radical, B is e.g. N-(2,2,6,6-tetramethyl-4-piperdyl)-butylamino, R is e.g. 2,2,6,6-tetramethyl-4-piperidyl and R2 is e.g. hexamethylene.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.