Process for the preparation of a polyolefin and syndiotactic pol

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

1994-08-05

1996-06-11

Smith, Edward J.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

502103, 502117, 526129, 526134, C08F 4642, C08F 1006

Patent

active

055256902

ABSTRACT:
A process for the preparation of a polyolefin by polymerization of at least one olefin, the said process comprising contacting the at least one olefin with a catalytic system comprising a metallocene and a cocatalyst, wherein the metallocene is selected from the group consisting of rac-2,2-dimethylpropylidene(1-.eta..sup.5 -cyclopentadienyl)(1-,.eta..sup.5 -fluorenyl)dichlorometallocene of titanium, zirconium, hafnium and vanadium.
Syndiotactic polypropylene having a melting temperature T.sub.m from 95.degree. to 160.degree. C., a syndiotactic pentad fraction [rrrr] from 0,91 to 0,96, a crystalline fraction f.sub.C from 25 to 50% and a viscosity-average molecular weight M.sub.v from 60,000 to 200,000.

REFERENCES:
patent: 4892851 (1990-01-01), Ewen et al.
patent: 5132381 (1992-07-01), Winter et al.
patent: 5225500 (1993-07-01), Elder et al.
"Syndioselective Propylene Polymerization Catalyzed by rac-2,2-Dimethylpropylidene (1-.eta..sup.5 -cyclopentadienyl) (1-.eta..sup.5 -fluorenyl) dichlorozirconium", Ricardo Fierro et al., Journal of Polymer Science, vol. 32, No. 4, Mar., 1994, pp. 661-673.

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