Process for the preparation of a syndiotactic propylene copolyme

Details Process for the preparation of a syndiotactic propylene copolyme Process for the preparation of a syndiotactic propylene copolyme

1995-04-24

1997-05-06

Wu, David W.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526160, 526943, 502152, C08F 442, C08F 464

Patent

active

056272456

ABSTRACT:
A syndiotactic propylene copolymer is obtained in high yields by copolymerization of propylene with small amounts of other olefins in the presence of a catalyst comprising a metallocene of the formula I ##STR1## in which M.sup.1 is titanium, zirconium, hafnium, vanadium, niobium or tantalum and an aluminoxane. This copolymer has a very high molecular weight, a very narrow molecular weight distribution, very high syndiotaxicity, advantageously low melting points and rubber-like behavior. Molded articles produced from the polymer are distinguished by high transparency, flexibility and tear strength. Their main areas of application are packagings of any type.

REFERENCES:
patent: 4892851 (1990-01-01), Ewen et al.
patent: 5086134 (1992-02-01), Antberg et al.
patent: 5132381 (1992-07-01), Winter et al.
Ewen, J.A. et al., J. Am. Chem. Soc. 110:6255-6256 (1988).

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