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.
Claims15
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.
A method for preparing a polydiene, the method comprising the steps of:
- (i) introducing conjugated diene monomer, a lanthanide-based catalyst system, dicyclopentadiene or substituted dicyclopentadiene, and optionally organic solvent to a reactor to form a liquid-phase polymerization mixture that includes less than 20% by weight of organic solvent based on the total weight of the 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.
A composition comprising:
- (i) a lanthanide-based catalyst system;
- (ii) conjugated diene monomer;
- (iii) polydiene;
- and
- (iv) dicyclopentadiene or substituted dicyclopentadiene, with the proviso that the composition includes less than about 20% by weight of organic solvent based on the total weight of the composition.
Dependencies are inferred from the claim text.