Method for bulk polymerization
AssigneeBridgestone Corporation
InventorsMark W. Smale, Steven Luo, Kevin McCauley, Randhir Shetty
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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.
Claims27
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 coordination 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 coordination 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 coordination 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.
A method for polymerizing conjugated diene monomer into polydienes, the method comprising:
- polymerizing a liquid-phase polymerization mixture that includes
- (i) conjugated diene monomer,
- (ii) a lanthanide-based catalyst system,
- (iii) dicyclopentadiene or substituted dicyclopentadiene, and
- (iv) optionally organic solvent,
- wherein said conjugated diene monomer comprises 1,3-butadiene, isoprene, 1,3-pentadiene, 1,3-hexadiene, 2,3-dimethyl-1,3-butadiene, 2-ethyl-1,3-butadiene, 2-methyl-1,3-pentadiene, 3-methyl-1,3-pentadiene, 4-methyl-1,3-pentadiene, 2,4-hexadiene or a mixture thereof;
- wherein said lanthanide-based catalyst system is formed by combining a lanthanide compound, (b) an alkylating agent, and (c) a halogen-containing compound;
- and wherein said organic solvent, if present, is less than about 20% by weight based on the total weight of the polymerization mixture.
Dependencies are inferred from the claim text.