Process for the production of amorphous elastomeric propylene homopolymers

Claim 1

A process for the production of elastomeric high molecular weight substantially amorphous propylene homopolymer comprising from about 35% to about 55% of a diethyl ether soluble fraction, the fraction having an inherent viscosity less than about 1.0 dl/g and being substantially free of isotactic crystallinity, the process comprising polymerizing propylene with a catalyst system comprising: (A) a solid catalyst component prepared by: (i) co-comminuting magnesium halide support base and aluminum trihalide in a molar ratio from about 8:0.5 to about 8:3 in the absence of added electron donor; and (ii) then co-comminuting the product of step (i) in the absence of added electron donor with sufficient titanium tetrahalide to provide a molar ratio of magnesium halide to titanium tetrahalide from about 8:0.1 to about 8:1; and (B) a trialkylaluminum co-catalyst component having from 1 to 9 carbon atoms in each alkyl group in a sufficient quantity to provide an Al/Ti ratio in the range from about 50:1 to about 600:1.