Method for the copolymerization of conjugated diolefins (dienes) and vinyl-aromatic monomers with rare-earth catalysts and use of the copolymers in rubber mixtures for tire applications
AssigneeBayer Aktiengesellschaft
InventorsHeike Windisch, Jürgen Trimbach, Peter Schertl, Ellen Giebeler, Rüdiger Engehausen
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Abstract
The present invention concerns a method for the copolymerization of conjugated diolefins and vinyl-aromatic monomers in the presence of rare-earth catalysts and the use of the copolymers in rubber mixtures for tire applications.
Claims21
A method for the copolymerization of conjugated diolefins with vinyl-aromatic compounds, wherein the polymerization of the conjugated diolefins with the vinyl-aromatic compounds is performed in the presence of catalysts consisting of
- a) at least one rare-earth metal compound and
- b) at least one organo-aluminum compound and in the presence of inert aliphatic and/or aromatic solvents or mixtures thereof at temperatures of −30 to +140° C., whereby the molar ratio of components (a):(b) is in the range of 1:(0.1 to 1000), component (a) of the catalyst is used in quantities of 1 μmol to 10 mmol relative to 100 g of the conjugated diolefins used, and the vinyl aromatic compound is used in quantities of 20 g to 2000 g, relative to 100 g of the conjugated diolefins used.
A method for the copolymerization of conjugated diolefins with vinyl-aromatic compounds, wherein the polymerization of the conjugated diolefins with the vinyl-aromatic compounds is performed in the presence of catalysts comprising
- a) at least one rare-earth metal compound,
- b) at least one cyclopentadienyl compound and
- c) at least one organo-aluminum compound;
- and in the presence of inert aliphatic and/or aromatic solvents or mixtures thereof at temperatures of −30 to +140 ° C., whereby the molar ratio of components (a):(b):(c) is in the range of 1:(0.01 to 1.99):(0.1 to 1000), component (a) of the catalyst is used in quantities of 1 lmol to 10 μmol relative to 100 g of the conjugated diolefins used, and the vinyl-aromatic compound is used in quantities of 20 g to 2000 g, relative to 100 g of the conjugated diolefins used.
The production of rubber moldings comprising the copolymerization of conjugated diolefins with vinyl-aromatic compounds, wherein the polymerization of the conjugated diolefins with the vinyl-aromatic compounds is performed in the presence of catalysts comprising
- a) at least one rare-earth metal compound,
- b) at least one cyclopentadienyl compound and
- c) at least one organo-aluminum compound;
- and in the presence of inert aliphatic and/or aromatic solvents or mixtures thereof at temperatures of −30 to +140° C., whereby the molar ratio of components (a):(b):(c) is in the range of 1:(0.01 to 1.99):(0.1 to 1000), component (a) of the catalyst is used in quantities of 1 μmol to 10 mmol relative to 100 g of the conjugated diolefins used, and the vinyl-aromatic compound is used in quantities of 20 g to 2000 g, relative to 100 g of the conjugated diolefins used.
The production of rubber moldings comprising the copolymerization of conjugated diolefins with vinyl-aromatic compounds, wherein the polymerization of the conjugated diolefins with the vinyl-aromatic compounds is performed in the presence of catalysts comprising
- a) at least one rare-earth metal compound and
- b) at least one organo-aluminum compound and in the presence of inert aliphatic and/or aromatic solvents or mixtures thereof at temperatures of −30 to +140° C., whereby the molar ratio of components (a):(b) is in the range of 1:(0.1 to 1000), component (a) of the catalyst is used in quantities of 1 μmol to 10 mmol relative to 100 g of the conjugated diolefins used, and the vinyl-aromatic compound is used in quantities of 20 g to 2000 g, relative to 100 g of the conjugated diolefins used.
Dependencies are inferred from the claim text.