Process for the preparation of a syndiotactic polyolefin

Details Process for the preparation of a syndiotactic polyolefin Process for the preparation of a syndiotactic polyolefin

1990-03-08

1992-07-21

Smith, Edward J.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

502117, 526127, 526132, 526351, 526150, C08F 4642, C08F 1000

Patent

active

051323818

ABSTRACT:
A syndiotactic polyolefin is obtained in a high yield by polymerization or copolymerization of an olefin of the formula R.sup.a --CH.dbd.CH--R.sup.b in the presence of a catalyst consisting of a metallocene of the formula I ##STR1## and an aluminoxane. This polyolefin has a very high syndiotactic index. At a low polymerization temperature, a polyolefin having a low average molecular weight and narrow molecular weight distribution is obtained, and at a high polymerization temperature a polymer having a high average molecular weight and a wide molecular weight distribution is obtained.
Shaped articles produced from the polymers are distinguished by a high transparency, flexibility, tear strength and excellent surface gloss.

REFERENCES:
patent: 4892851 (1990-01-01), Ewen et al.
Lotz, B. et al., Macromolecules 21: 2375-2382 (1988).
Ewen, J. A. et al., J. Am. Chem. Soc. 110: 6255-6256 (1988).

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