Process for producing stereospecific polymers
A stereoregular and stereoscopic technology applied in the field of supported stereorigid metallocene catalysts
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[0052]The present invention relates to methods for providing higher ordered polymer structures using supported stereoregular metallocenes, which may be neutral or cationic, and which are especially syndiotactic in the growth of stereoregular polymers. Stereopolymer growth is effective. As mentioned above, both conventional Ziegler-Natta catalysts and metallocene catalysts can be supported on various inorganic supports. As described in the aforementioned patent to Myer, when Ziegler-Natta type catalysts such as tetrachlorides of zirconium, hafnium and titanium are supported on a crystalline material such as magnesium dichloride, the support material is said to be "activated" It is highly advantageous to provide a large surface area where the transition metal sites are exposed for polymerization and the monomer units can be incorporated into the growing polymer chain. Similar ideas govern the use of metallocene supports. Therefore, high surface area materials are considered to...
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