Back to results
US 8,163,855 B2Granted
Method for bulk polymerization
AssigneeBridgestone Corporation
InventorsSteven Luo, Mark W. Smale, Kevin McCauley, Randhir Shetty
Life of this patent
Estimating the term…
Abstract
A method for polymerizing conjugated diene monomer into polydienes, the method comprising: polymerizing conjugated diene monomer within a liquid-phase polymerization mixture that includes conjugated diene monomer, a lanthanide-based catalyst system, dicyclopentadiene or substituted dicyclopentadiene, and optionally organic solvent, with the proviso that the organic solvent, if present, is less than about 20% by weight based on the total weight of the polymerization mixture.
Claims10
A method for preparing a polydiene, the method comprising the steps of:
- (i) introducing conjugated diene monomer, a lanthanide-based catalyst system, and dicyclopentadiene or substituted dicyclopentadiene, to a reactor to form a liquid-phase polymerization mixture;
- and
- (ii) allowing the monomer to polymerize in the presence of the lanthanide-based catalyst system and the dicyclopentadiene or substituted dicyclopentadiene within the liquid-phase polymerization mixture to form a polydiene, where the catalyst system is formed by combining (a) a lanthanide compound, (b) an alkylating agent, and (c) a halogen-containing compound.
Dependencies are inferred from the claim text.