Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Plural component system comprising a - group i to iv metal...
Patent
1989-10-10
1991-07-30
Garvin, Patrick P.
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Plural component system comprising a - group i to iv metal...
502103, 526351, 556 43, 556 53, 556 58, C08F 464, C08F 468, C08F 4622
Patent
active
050360345
ABSTRACT:
This invention is for a metallocene compound which can be used in a catalyst system to produce hemiisotactic polymer. The compound is a bridged metallocene compound having dissimilar cyclopentadienyl groups and no bi-lateral symmetry. One example of the compound is isopropylidene(3-methylcyclopentadienyl-1-fluorenyl) zirconium dichloride. The catalyst of this invention can be converted to an ionic metallocene catalyst by an ionizing agent, such as methylaluminoxane.
The polymer produced with this catalyst is characterized by having an isotactic structure effecting only every other asymmetric carbon atom. In the case of polypropylene, every other methyl group is on the same side of the principal polymer chain as represented by a Fisher projection. The remaining methyl groups can be either on the same side or on the opposite side of the principal polymer chain. The polymer produced with the catalyst of this invention can be used as a plasticizer.
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patent: 4892851 (1990-01-01), Ewen et al.
Resolution of the Carbon 13 Nuclear Magnetic Resonance Spectrum of Hemi Isotactic Polypropylene at the Decad and Undecad level, Farino et al.
Macromolecules, vol. 18; pp. 928-932 (1985).
Hemitactic Polypropylene; An Example of a Novel Kind of Polymer Tacticity, Farina et al.; Macromolecules, vol. 15, pp. 1451-1452.
Hemitactic Polymers, Farina et al., Marcomolecules, vol. 18; pp. 923-928 (1985).
Fina Technology, Inc.
Garvin Patrick P.
Wheelington Jim D.
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