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US 11,230,622 B2Granted
High cis-1,4 block copolymers of polybutadiene and polyisoprene
AssigneeBridgestone Corporation
InventorsHyeonjae Kim, Walter A. Salamant, Noriaki Yukimura, Steven Luo
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Abstract
A vulcanizable composition comprising rubber component, a filler, and a curing agent, where the rubber component includes a block copolymer of polybutadiene and polyisoprene, and where the block copolymer has a cis content of at least 90%.
Claims22
A method of preparing a high 1,4-cis block copolymers of polybutadiene and polyisoprene comprising:
- (i) forming a polymerization mixture that includes a pseudo-living polymer by combining a first monomer and a lanthanide-based catalyst, where the lanthanide-based catalyst comprises
- (a) a lanthanide-containing compound,
- (b) an aluminoxane,
- (c) an organoaluminum compound defined by the formula AlRnX3-n, where each R is individually a hydrocarbon group or a substituted hydrocarbon group, each X is individually a hydrogen atom, a carboxylate group, an alkoxide group, or an aryloxide group, and where n is an integer of 1 to 3, and
- (d) a halogen-containing compound;
- (ii) adding a second monomer to the polymerization mixture that includes a pseudo-living polybutadiene polymer, and
- where the first monomer is either 1,3-butadiene or isoprene and where the second monomer is not the same as the first monomer and is either 1,3-butadiene or isoprene.
4 more elements
A method of preparing a high 1,4-cis block copolymer of polybutadiene and polyisoprene comprising:
- (i) polymerizing 1,3-butadiene with a lanthanide-based catalyst to form a pseudo-living polymer, where the lanthanide-based catalyst comprises
- (a) a lanthanide-containing compound,
- (b) an aluminoxane,
- (c) an organoaluminum compound defined by the formula AlRnX3-n, where each R is individually a hydrocarbon group or a substituted hydrocarbon group, each X is individually a hydrogen atom, a carboxylate group, an alkoxide group, or an aryloxide group, and where n is an integer of 1 to 3, and
- (d) a halogen-containing compound;
- (ii) reacting the pseudo-living polymer with isoprene.
3 more elements
Dependencies are inferred from the claim text.