Process for producing mildly elastomeric primarily isotatic poly

Details Process for producing mildly elastomeric primarily isotatic poly Process for producing mildly elastomeric primarily isotatic poly

1990-02-26

1992-06-02

Teskin, Fred

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526125, 526141, 5263486, 526351, 502123, 502124, C08F 4642

Patent

active

051187671

ABSTRACT:
A process and a catalyst for the production of mildly elastomeric primarily isotactic polyolefins characterized by intermediate average block lengths wherein olefins are polymerized in the presence of the catalyst which comprises the reaction product of a magnesium alkoxide and a tetravalent titanium halide which takes place in the presence of an electron donor, an organoaluminum compound, and a selectivity control agent which is an effectively unhindered heterocyclic aromatic nitrogen compound.

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