| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a production method of an iron-based catalyst composition and syndiotactic 1,2-polybutadiene.SOLUTION: In order to polymerize 1,3-butadiene to syndiotactic 1,2-polybutadiene, a catalyst composition consisting of (a) an iron-containing compound, (b) an organomagnesium compound and (c) a dihydrocarbyl hydrogen phosphite is disclosed. By using the catalyst composition of this disclosure, use of environmentally harmful components such as carbon disulfide and halogenated hydrocarbon are avoided. The melting temperature of syndiotactic 1,2-polybutadiene can be changed to from about 100°C to about 190°C by changing the catalyst component and the composition ratio. It is extremely desirable to be able to change the melting temperature by a single catalyst composition. The syndiotactic 1,2-polybutadiene can be used as a plastic or additive for a rubber composition, which can be crosslinked to a common rubber by using a common crosslinking agent.</p> |
