Polymer having long isotactic sequences and randomly-distributed

Details Polymer having long isotactic sequences and randomly-distributed Polymer having long isotactic sequences and randomly-distributed

1995-06-07

1997-12-23

Nagumo, Mark

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526348, 526127, 526160, 526943, 525240, 502103, 502117, 556 11, C08F 1006

Patent

active

057008965

ABSTRACT:
Propylene isoblock polymers with 0.5 to 10 mol %, based on the total polymer, of randomly distributed ethylene content and with a narrow molecular weight distribution and rubber-like properties are obtained when propylene is polymerized using a catalyst comprising an aluminoxane and a chiral metallocene, containing bridges, of formula I: ##STR1## in which M.sup.1 is preferably hafnium or zirconium,

REFERENCES:
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patent: 4522982 (1985-06-01), Ewen
patent: 4542199 (1985-09-01), Kaminsky et al.
patent: 4769510 (1988-09-01), Kaminsky et al.
patent: 4841004 (1989-06-01), Kaminsky et al.
patent: 4849487 (1989-07-01), Kaminsky et al.
patent: 4937301 (1990-06-01), Chang
patent: 5017714 (1991-05-01), Welborn, Jr.
patent: 5328969 (1994-07-01), Winter et al.

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