Process for the preparation of a dilithiated initiator and anionic polymerization process
US6562923B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 13, 2002 |
| Grant date | May 13, 2003 |
| Priority date | — |
| Expiry date | May 13, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F36/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to a process for the preparation of a dilithiated initiator usable in anionic polymerization, a process for the preparation by anionic polymerization of a living diene elastomer which is provided with a carbon-lithium group at each of its chain ends, and a process for the preparation of a copolymer having three blocks starting from said living diene elastomer. The process for the preparation of a dilithiated initiator according to the invention involves of reacting a first reagent, a dialkenyl benzene, and a second reagent, secondary butyllithium, in the presence of a diamine, in an aliphatic or alicyclic hydrocarbon solvent, such that the ratio of the number of moles of first reagent to the number of moles of second reagent is substantially equal to 0.5, so that the initiator obtained is essentially a bi-adduct resulting from the addition of a molecule of secondary butyllithium to each of the two double bonds in the dialkenyl benzene.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.