Selective hydrogenation of conjugation diolefin polymers with rare earth catalysts
US5177155A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 13, 1991 |
| Grant date | Jan 5, 1993 |
| Priority date | — |
| Expiry date | May 13, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F8/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
This invention provides a catalyst and a process for the hydrogenation of conjugated diolefin polymers which first involves the polymerization or copolymerization of such monomers with an organo alkali metal polymerization initiator in a suitable solvent thereby creating a living polymer. The living polymer can be terminated by the addition of hydrogen. Finally, selective hydrogenation of the unsaturable double bonds in the conjugated diolefin units of the terminated polymer is carried out in the presence of an initiator and at least one rare earth compound of the formula EQU *Cp.sub. MR where *Cp is pentamethylcyclopentadiene, M is a rare earth element and R is alkyl, aryl, aralkyl or hydrogen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.