Processes for the preparation of high-cis polydienes
AssigneeBridgeston Corporation
InventorZengquan Qin
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Abstract
The present disclosure is directed towards a solution or bulk polymerization process for preparing high-cis polydienes that utilizes at least one vinyl aromatic compound as a molecular weight regulator. The disclosed solution or bulk polymerization processes are useful for preparing high-cis polydienes with a Mooney viscosity between 30 and 55 while allowing the use of lower amounts of catalyst.
Claims31
A solution or bulk polymerization process for preparing a high-cis polydiene having a cis-1,4-linkage content of 90% or greater comprising:
- providing at least one conjugated diene monomer containing less than 20 carbon atoms;
- providing at least one vinyl aromatic compound in a total amount of 0.01 to 2 mole % per mole of total conjugated diene monomer;
- providing a catalyst system consisting of (a) a nickel compound, optionally in combination with an alcohol, (b) an organoaluminum, organomagnesium, organozinc compound, or a combination thereof, and (c) a fluorine-containing compound or a complex thereof, wherein one or a mixture of organic solvents optionally serve to dissolve the catalyst system or serve as a carrier for the catalyst system;
- and
- mixing the at least one conjugated diene monomer with the at least one vinyl aromatic compound and the catalyst system to form a polymerization mixture wherein the resulting high-cis polydiene has a mooney viscosity between 30 and 55 and contains no more than 0.8 mole % of vinyl aromatic compound per mole of monomer contained within the high-cis polydiene.
A solution or bulk polymerization process for preparing a high-cis polydiene having a cis-1,4-linkage content of 90% or greater comprising:
- providing at least one conjugated diene monomer containing less than 20 carbon atoms;
- providing at least one vinyl aromatic compound in a total amount of 0.01 to 2 mole % per mole of total conjugated diene monomer;
- providing a catalyst system consisting of (a) a nickel compound, optionally in combination with an alcohol, (b) an organoaluminum, organomagnesium, organozinc compound, or a combination thereof, and (c) a fluorine-containing compound or a complex thereof, wherein one or a mixture of organic solvents optionally serve to dissolve the catalyst system or serve as a carrier for the catalyst system;
- and
- mixing the at least one conjugated diene monomer with the at least one vinyl aromatic compound and the catalyst system to form a polymerization mixture wherein the resulting high-cis polydiene has a mooney viscosity between 30 and 55 and contains no more than 0.8 mole % of vinyl aromatic compound per mole of monomer contained within the high-cis polydiene,
- wherein the at least one conjugated diene monomer containing less than 20 atoms comprises 1,3-butadiene and the at least one vinyl aromatic compound is selected from the group consisting of styrene, methyl styrene, tertbutyl styrene, and mixtures thereof.
A solution or bulk polymerization process for preparing a high-cis polybutadiene having a cis-1,4-linkage content of 90 to about 97% comprising:
- providing 1,3-butadiene monomer;
- providing at least one vinyl aromatic compound in a total amount of 0.01 to 2 mole % per mole of 1,3-butadiene monomer;
- providing a catalyst system consisting of (a) a nickel compound, optionally in combination with an alcohol, (b) an organoaluminum, organomagnesium, organozinc compound, or a combination thereof, and (c) a fluorine-containing compound or a complex thereof, wherein one or a mixture of organic solvents optionally serve to dissolve the catalyst system or serve as a carrier for the catalyst system;
- and
- mixing the at least one conjugated diene monomer with the at least one vinyl aromatic compound and the catalyst system to form a polymerization mixture wherein the resulting high-cis polydiene has a mooney viscosity between 30 and 55 and contains no more than 0.8 mole % of vinyl aromatic compound per mole of monomer contained within the high-cis polydiene,
- wherein the at least one conjugated diene monomer containing less than 20 atoms comprises 1,3-butadiene and the at least one vinyl aromatic compound is selected from the group consisting of styrene, methyl styrene, tertbutyl styrene, and mixtures thereof.
Dependencies are inferred from the claim text.