High molecular weight copolymers of propylene and olefins having

Details High molecular weight copolymers of propylene and olefins having High molecular weight copolymers of propylene and olefins having

1998-04-13

2000-05-02

Wu, David W.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526127, 526943, 502117, 502152, 502155, C08F 442

Patent

active

060574089

ABSTRACT:
A copolymer having from 80 to 40% by weight of propylene units, based on the total polymer, and from 20 to 60% by weight of at least one comonomer, based on the total polymer. The comonomer units are prepared from ethylene or olefins having at least 4 carbon atoms and the formula R.sup.a --CH.dbd.CH--R.sup.b, where R.sup.a and R.sup.b are identical or different and are each a hydrogen atom or an alkyl radical having from 1 to 15 carbon atoms, or R.sup.a and R.sup.b, together with the carbon atoms connecting them, form a ring having 4 to 12 carbon atoms. The copolymer has a viscosity number of greater than 200 cm.sup.3 /g.

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Spaleck, "Stereospecific metallocene catalysts", Macromolecular Symposia, vol. 89, pp. 237-247, (Jan. 1995).

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