Electron donor and catalyst system for olefin polymerization

Details Electron donor and catalyst system for olefin polymerization Electron donor and catalyst system for olefin polymerization

1997-02-21

2001-11-27

Wu, David W. (Department: 1713)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C502S121000, C502S127000

Reexamination Certificate

active

06323293

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to traditional Ziegler-Natta polymerization; particularly the use of sterically hindered electron donors and their catalyst systems. Such donor and its catalyst systems are notably useful in enhanced tacticity in homo-polymerization of olefins and in improved control of molecular weight, particularly hydrogen response, in homo- and co-polymerization of monomers comprising at least one Ziegler-Natta polymerizable bond. This system is particularly useful in olefin polymerization, notably propylene.
BACKGROUND OF THE INVENTION
Mao et al. describe in U.S. Pat. Nos. 4,784,983 and 4,861,847, respectively, a process for preparing a catalyst component and a process for producing olefinic polymers by use of the catalyst component and an organic aluminum compound.
Ewen describes, in U.S. Pat. Nos. 4,927,797 and 5,066,738 which are incorporated by reference, a catalyst system and a process for polymerization of olefins, respectively. Both use a catalyst component described as a Toho-type new generation titanium catalyst in combination with an electron donor.
SUMMARY OF THE INVENTION
Our invention provides, at least, catalyst system and means for molecular weight control of polymers derived from Ziegler-Natta polymerizable monomers as well as enhanced tacticity control, particularly as measured by xylene solubility, of polymers derived from Ziegler-Natta polymerizable monomers from which tacticity differentiated polymers, particularly of olefins, especially a-olefins, may be produced. Use of this system provides particularly beneficial results in production of polypropylene.


REFERENCES:
patent: 4784983 (1988-11-01), Mao et al.
patent: 4861847 (1989-08-01), Mao et al.
patent: 4927797 (1990-05-01), Ewen et al.
patent: 5066738 (1991-11-01), Ewen et al.
patent: 5247031 (1993-09-01), Kioka et al.

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