Process for the preparation of syndiotactic polyolefins having a

Details Process for the preparation of syndiotactic polyolefins having a Process for the preparation of syndiotactic polyolefins having a

1994-12-22

1996-07-23

Wu, David W.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526118, 526127, 526160, 526943, 526351, 502152, C08F 442, C08F 206, C08F 218, C08F 234

Patent

active

055390668

ABSTRACT:
Syndiotactic polyolefins having a molecular weight distribution M.sub.w /M.sub.n of .gtoreq.3 and which may be monomodal, bimodal or multimodal are obtained by polymerization or copolymerization of olefins of the formula RCH.dbd.CHR, in which a catalyst system comprising an aluminoxane and a transition-metal component (metallocene) is used, the transition-metal component comprising at least 2 metallocenes of the formula ##STR1## which are stereorigid and whose moiety formed by Zr and the substituents R.sup.1 -R.sup.4 has C.sub.s symmetry or slightly distorted C.sub.s symmetry.

REFERENCES:
patent: 4849487 (1989-07-01), Kaminsky et al.
patent: 4892851 (1990-01-01), Ewen et al.
patent: 4975403 (1990-12-01), Ewen
Ewen et al, "Syndiotactic Propylene Polymerization with Group 4 Metallocene" J. Am. Chem. Soc. 1988 pp. 6255-6256.
Keii et al "Catalytic Olefin Polymerization" International Symposium on Recent Developments in Olefin Polymerization Catalyst, 1989, pp. 501-515.
Giannetti, E., et al, J. of Polymer Science: Polymer Chem. Ed. 23:2117-2134 (1985).

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