Process for the production of elastomeric, primarily syndiotacti

Details Process for the production of elastomeric, primarily syndiotacti Process for the production of elastomeric, primarily syndiotacti

1989-04-25

1993-12-14

Smith, Edward J.

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Plural component system comprising a - group i to iv metal...

C08F 4649

Patent

active

052702766

ABSTRACT:
A process and a catalyst for the production of elastomeric primarily syndiotactic polypropylene characterized by short average block lengths wherein propylene is 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 hindered heterocyclic aromatic nitrogen compound wherein the hindrance is not provided by a Cl.sup.- or methoxy group.

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