Modified diene elastomer and its preparation
AssigneesUbe Industries, Ltd., Sumitomo Rubber Industries, Ltd.
InventorsTokuji Inoue, Tetsuji Nakajima, Kiyoshige Muraoka, Noriko Yagi
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Abstract
A modified diene elastomer prepared by a process comprising the steps of polymerizing a diolefin compound containing a conjugated double bond in a liquid phase in the presence of a cobalt compound, an organic aluminum compound containing a halogen atom, and water, to give a solution containing a diene elastomer, and reacting the diene elastomer with an elastomer-modifying compound is favorably employed for the manufacture of tire tread, particularly when it is employed in combination with silica as a filler.
Claims20
A process for preparing a modified diene elastomer which comprises the steps of:
- polymerizing a diolefin compound containing a conjugated double bond in a liquid phase in the presence of a cobalt compound, an organic aluminum compound containing a halogen atom, and water, to give a solution containing a diene elastomer;
- and
- reacting the diene elastomer with an elastomer-modifying compound.
A modified diene elastomer containing at least 80% of cis-1,4-structure units in its recurring units, a Mooney viscosity of 20 to 80 in terms of ML1+4 at 100° C., and a weight average molecular weight of 200,000 to 1,000,000 measured by a gel permeation method, which is prepared by a process comprising the steps of polymerizing a diolefin compound containing a conjugated double bond in a liquid phase in the presence of a cobalt compound, an organic aluminum compound containing a halogen atom, and water, to give a solution containing a diene elastomer, and reacting the diene elastomer with an elastomer-modifying compound.
An elastomer composition comprising an elastomer component which is composed of 10 to 80 weight % of a modified diene elastomer containing at least 80% of cis-1,4-structure units in its recurring units, a Mooney viscosity of 20 to 80 in terms of ML1+4 at 100° C., and a weight average molecular weight of 200,000 to 1,000,000 measured by a gel permeation method, which is prepared by a process comprising the steps of polymerizing a diolefin compound containing a conjugated double bond in a liquid phase in the presence of a cobalt compound, an organic aluminum compound containing a halogen atom, and water, to give a solution containing a diene elastomer, and reacting the diene elastomer with an elastomer-modifying compound, and 20 to 90 weight % of one or more other elastomer compounds, and silica in an amount of 5 to 100 weight parts per 100 weight parts of the elastomer component.
A tire tread employing an elastomer composition comprising an elastomer component which is composed of 10 to 80 weight % of a modified diene elastomer containing at least 80% of cis-1,4-structure units in its recurring units, a Mooney viscosity of 20 to 80 in terms of ML1+4 at 100° C., and a weight average molecular weight of 200,000 to 1,000,000 measured by a gel permeation method, which is prepared by a process comprising the steps of polymerizing a diolefin compound containing a conjugated double bond in a liquid phase in the presence of a cobalt compound, an organic aluminum compound containing a halogen atom, and water, to give a solution containing a diene elastomer, and reacting the diene elastomer with an elastomer-modifying compound, and 20 to 90 weight % of one or more other elastomer compounds, and silica in an amount of 5 to 100 weight parts per 100 weight parts of the elastomer component.
Dependencies are inferred from the claim text.