Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Organic compound containing
Patent
1997-12-11
2000-09-19
Wu, David W.
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Organic compound containing
502155, 526129, 526156, 526158, 526160, 526943, B01J 3116
Patent
active
061211826
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a polyolefin production catalyst for preparing polyolefins and to a method of preparing polyolefins. More particularly, the present invention relates to novel catalyst components for preparing high rigid, high melting point polyolefins, in particular isotactic poly .alpha.-olefins, which are used as industrial material for use in automobiles and the like and which have been difficult to produce with conventional metallocene catalysts; to catalysts for preparing polyolefins with such catalyst components; and to method of preparing polyolefins by using such catalysts.
BACKGROUND ART
Poly(.alpha.-olefin)s are known to be those polymers having thermal resistance, rigidity and other properties that are largely influenced by their stereoregularity and regioregularity. Therefore, the performance of poly(.alpha.-olefin)s depends largely on the stereoselectivity and regioselectivity of the catalyst used for .alpha.-olefin polymerization.
Here, the regioselectivity in isotactic polymerization of propylene is evaluated as a proportion of 1,2-inserted monomers (1,2-insertion, primary insertion) to all the propylene monomers inserted. Besides 1,2-insertion, there are 2,1-insertion or secondary insertion and 1,3-insertion (Macromolecules, 1988, 21, 617)(hereafter, the disturbance in regioregularity is referred to as regiodefect).
By the term "2,1-insertion" is meant a linkage containing a 1,2-insertion which includes inserted therein a propylene monomer whose methyne group is bonded to the metal group of a catalyst to form a series of methyne groups bonded together. ##STR2##
The 2,1-insertion includes two types of configurations, i.e., racemic type and meso type in accordance with the difference in enantioface where the 1,2-inserted monomers after the 2,1-insertion coordinate (Polymer, 1992, 33, 254).
By the term "1,3-insertion" is meant that a propylene unit, which is constituted by 3 consecutive methylene units, is inserted in the chain of 1,2-insertions. ##STR3##
In the isotactic polymerization of propylene with a metallocene catalyst (a catalyst comprised of a metallocene compound and a Lewis acid compound such as methylaluminoxane), the resulting polymer have low melting point compared with the isotactic polypropylene obtained with Ziegler-Natta catalyst, due to existence of regiodefect defects although both the polymers have the same stereoregularity (J. Mol. Cat. 56 (1989) 237). Therefore, in the isotactic polymerization of propylene with a metallocene catalyst, catalyst systems are desired which exhibit increased regioselectivity as well as stereoselectivity.
On the other hand, in the polymerization of .alpha.-olefin with a metallocene catalyst, it is known that the stereoregularity and regioregularity of polymers vary considerably depending on the structure of the ligands to the metallocene compound (Macromolecules, 1988, 21, 617; Organometallics, 1994, 13, 964; Angew Chem. Int. Ed. Engl., 1995, 34, 1143).
Japanese Patent Application (Kokai) No. 61-130314 (U.S. Pat. No. 4,769,510) and Japanese Patent Application (Kokai) No. 63-295607 (European Patent No. 284,708) disclose rac-ethylidenebis(1-indenyl)zirconium dichloride, rac-ethylidenebis(4,5,6,7-tetrahydro-1-indenyl)zirconium dichloride, rac-dimethylsilylenebis(1-indenyl)zirconium dichloride and other C.sub.2 symmetrical type metallocene compounds represented by the following general formula (5) ##STR4##
The metallocene compounds give rise to isotactic polypropylene in the presence of methylaluminoxane or other Lewis acid promoter. However, isotactic polypropylene polymers obtained using the metallocene compound under the conditions above 25.degree. C. that are useful industrially have low molecular weight and insufficient stereoregularity and regioregularity so that the polymer has low melting point. Therefore, the product is unsuitable for high rigid, high melting point isotactic polypropylene useful as an industrial material.
Thereafter, with view to improving the stereoregularity, molecular weight and th
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Inazawa Shintaro
Okumura Yoshikuni
Ono Michio
Sakuragi Tsutomu
Choi Ling-Siu
Japan Polyolafins Co., Ltd.
Wu David W.
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