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US 7,741,418 B2Granted
Process for producing polydienes
AssigneeBridgestone Corporation
InventorsSteven Luo, Kevin M. McCauley, Jason T. Poulton
Life of this patent
Estimating the term…
Abstract
A process for preparing a polydiene, the process comprising the step of polymerizing conjugated diene monomer in the presence of a dihydrocarbyl ether, where said step of polymerizing employs a lanthanide-based catalyst system.
Claims32
A process for preparing a polydiene, the process comprising the step of:
- polymerizing conjugated diene monomer in the presence of a dihydrocarbyl ether, where said step of polymerizing employs a lanthanide-based catalyst system, where said step of polymerizing takes place within a polymerization mixture that is substantially devoid of solvent, and where said lanthanide-based catalyst system includes the combination or reaction product of (a) a lanthanide compound, (b) an alkylating agent, and (c) a halogen-containing compound, to thereby produce a polydiene having a cis-1,4 linkage content in excess of 99%.
A process for preparing a polydiene, the process comprising the step of:
- polymerizing conjugated diene monomer with a lanthanide-based catalyst system including the combination of or reaction product of (a) a lanthanide compound, (b) an alkylating agent, (c) a halogen-containing compound, and (d) a dihydrocarbyl ether, where said step of polymerizing takes place within a polymerization mixture that includes less than 20% by weight of solvent based on the total weight of the polymerization mixture, and where the dihydrocarbyl ether is defined by the formula R—O—R, where each R is independently a hydrocarbyl group or substituted hydrocarbyl group selected from the group consisting of alkyl, cycloalkyl, substituted cycloalkyl, alkenyl, cycloalkenyl groups, and benzyl groups.
A process for preparing a polydiene, the process comprising the step of:
- introducing (a) conjugated diene monomer, (b) a lanthanide compound, (c) an alkylating agent, (d) a halogen-containing compound, and (e) a dihydrocarbyl ether, where said step of introducing forms a polymerization mixture that includes less than 20% by weight of solvent based on the total weight of the polymerization mixture, and where the dihydrocarbyl ether is defined by the formula R—O—R, where each R is independently a hydrocarbyl group or substituted hydrocarbyl group selected from the group consisting of alkyl, cycloalkyl, substituted cycloalkyl, alkenyl, cycloalkenyl groups, and benzyl groups.
Dependencies are inferred from the claim text.