Bulk polymerization process for producing polydienes
AssigneeBridgestone Corporation
InventorsSteven Luo, William M. Cole, Yoichi Ozawa
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Abstract
A method of producing cis-1,4-polydienes, the method comprising the step of contacting conjugated diene monomer with a lanthanide-based catalyst system in the presence of less than 20% by weight of organic solvent based on the total weight of monomer, organic solvent, and resulting polymer, where the lanthanide-based catalyst system is the combination of or reaction product of (a) a lanthanide compound, (b) an organoaluminum hydride, (c) a trihydrocarbylaluminum, and (d) a halogen-containing compound.
Claims21
A method of producing cis-1,4-polydienes, the method comprising the step of:
- contacting conjugated diene monomer, where the conjugated diene monomer is in the liquid phase, with a lanthanide-based catalyst system in the presence of less than 20% by weight of organic solvent based on the total weight of monomer, organic solvent, and resulting polymer, where the lanthanide-based catalyst system includes the combination of or reaction product of (a) a lanthanide compound, (b) an organoaluminum hydride, (c) a trihydrocarbylaluminum, and (d) a halogen-containing compound.
A process for producing polydienes, the process comprising:
- polymerizing a conjugated diene monomer by employing the lanthanide-based catalyst system, where the step of polymerizing takes place at a temperature of from about 0° C. to about 50° C. and a pressure sufficient to maintain a majority of the monomer in the liquid phase, where said step of polymerizing takes place in the presence of less than 20% by weight organic solvent based upon the total weight of the monomer, organic solvent, and resulting polydiene, and where the lanthanide-based catalyst system includes the combination of or reaction product of (a) a lanthanide compound, (b) an organoaluminuin hydride, (c) a trihydrocarbylaluntinum, and (d) a halogen-containing compound.
Dependencies are inferred from the claim text.