Method for preparing a diene elastomer
US7396889B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 11, 2007 |
| Grant date | Jul 8, 2008 |
| Priority date | — |
| Expiry date | Apr 11, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/907
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method for preparing a diene elastomer, such as a butadiene homopolymer or copolymer, in particular, a polybutadiene, with a high level of cis-1,4 linkages that has both a Mooney viscosity greater than or equal to 40 and a polydispersity index of less than 2.1. The method comprises a reaction of a catalyst system with at least one conjugated diene monomer to be polymerized and the catalyst system is based on at least:optionally one preforming conjugated diene;one salt of one or more rare earth metals;an inert hydrocarbon-based solvent;an alkylating agent comprising an allyl derivative of aluminum of formula R″nAlR′3-n, where R′ is a saturated or unsaturated alkyl group or else a hydride, where R″ is an allyl group and where n is an integer inclusively between 1 and 3; anda halogen donor that belongs to the family of alkylaluminum halides, excluding alkylaluminum sesquihalides.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.