Highly active catalysts for alkylene oxide polymerization
US8273678B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 28, 2008 |
| Grant date | Sep 25, 2012 |
| Priority date | — |
| Expiry date | Aug 31, 2028 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/2654
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The reaction product of the reaction product of A.) a ligand of the formula (I), wherein R1, R2, R3, and R4 in each occurrence independently are the same or different hydrocarbyl substituents of 1 to 20 carbon atoms, hydrogen, halogen, or alkoxy groups of 1 to 8 carbon atoms; X in each occurrence independently is CR6 with R6 being hydrogen or an alkyl group of 1 to 8 carbon atoms; and R5 is an organic divalent group of 4 to 40 carbon atoms with the proviso that the two nodes X are not bound to the same atom or to vicinal atoms in the group R5; B.) an aluminum compound of the formula AlR7R8R9, wherein R7, R8 and R9 each independently is a C1 to C12 hydrocarbyl group, hydrogen, halogen, or an alkoxy group of 1 to 20 carbon atoms; and C.) a Lewis base selected from the group consisting of amines, phosphines, amides, nitriles, isonitriles, and alcohols is useful as a polymerization catalyst, particularly for the homopolymerization or copolymerization of an alkylene oxide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.