Block oligomers containing 1-hydrocarbyloxy-2,2,6,6-tetramethyl-4-piperidyl groups as stabilizers for organic materials
US6409941B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 18, 1999 |
| Grant date | Jun 25, 2002 |
| Priority date | — |
| Expiry date | Nov 18, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2201/08
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A product obtainable by transferring groups of formula (G-I) being present in a block oligomer having a polydispersity {overscore (M)}w/{overscore (M)}n of 1 to 1.7 and corresponding to formula (I) to groups of formula (Gu-II), wherein R1 is a hydrocarbyl radical or —O—R1 is oxyl; said transfer is carried out by reaction of the block oligomer with a hydroperoxide in a hydrocarbon solvent in the presence of a peroxide decomposing catalyst; n is a number from 2 to 14; R2 is for example C2-C12alkylene; A is for example —N(R4)(R5); R4 and R5 are for example C1-C18alkyl; R is preferably a group of formula (G-I) and B and B* have one of the meanings given for A; with the proviso that in the individual recurrent units of formula (I), each of the radicals B, R and R2 has the same or a different meaning. The products are useful as light stabilizers, heat stabilizers and oxidation stabilizers for organic materials, in particular synthetic polymers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.