Process for hydrogenating a conjugated diene polymer
US6951906B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 1998 |
| Grant date | Oct 4, 2005 |
| Priority date | — |
| Expiry date | Dec 18, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F8/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
This invention relates to a process for selectively hydrogenating the unsaturated double bonds of conjugated diene units of a homopolymer or copolymer. By using a highly active novel homogeneous organo titanium catalyst represented by formula (I) and lithium hydride (LiH) prepared in solution of organo lithium compound and hydrogen as a reducing agent, a polymer could be hydrogenated with significantly high yield and good reproducibility. In addition, this invention is characterized by a novel method in that when a copolymer containing a conjugated diene and vinyl-substituted aromatic hydrocarbon, the unsatured double bonds of conjugated diene units are selectively hydrogenated. In said formula where, Cp is a cyclopentadienyl group (C5H5); R1 and R2 are the same or different and are selected from halogen atom; R3 and R4 are the same of different and are selected from hydrogen atoms, alkyl or alkoxy group containing 1 to 12 carbon atoms, aryl or aryloxy groups containing 6 to 20 carbon atoms and cycloalkyl groups containing 6 to 20 carbon atoms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.