Process for the preparation of a polypropylene molding compositi

Details Process for the preparation of a polypropylene molding compositi Process for the preparation of a polypropylene molding compositi

1990-12-19

1993-08-03

Schofer, Joseph L.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525268, 525323, 526160, 502152, C08F29708

Patent

active

052329933

ABSTRACT:
A polypropylene molding composition having syndiotactic polymer chains is obtained in a high yield by the copolymerization of propylene with ethylene or a 1-olefin of the formula R.sup.a --CH.dbd.CH--R.sup.b in the presence of a catalyst comprising a metallocene of the formula I ##STR1## in which M.sup.1 is titanium, zirconium, hafnium, vanadium, riobium or tantalum, and an aluminoxane. This molding composition has a very high molecular weight, a very narrow molecular-weight distribution and very high syndiotaxy. Shaped articles produced from the molding composition are distinguished by high transparency, flexibility, bear strength and excellent surface luster.

REFERENCES:
patent: 4576994 (1986-03-01), Dorrer et al.
patent: 4892851 (1990-01-01), Ewen et al.
patent: 5086134 (1992-02-01), Antburg et al.
Journal of the American Chemical Society, vol. 110, "Syndiospecific Propylene Polymerizations with Group 4 Metallocenes", pp. 6255-6256, 1988.

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