Process for the preparation of a syndiotactic polyolefin and cat

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

1994-07-21

1999-02-16

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, 556 52, 556 53, 556 11, 526127, 526132, 526351, 526150, C08F 4642, C08F 1000

Patent

active

RE0361038

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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