Patent ID: 6586536
Filing Date: 2003-07-01
Classification: C08F,Y10S

Abstract:
A process for preparing an atactic, substantially amorphous, tacky propylene homopolymer, which comprises the steps of (a) introducing liquefied propylene into a reactor; (b) introducing a catalyst system into the reactor; (c) allowing the liquefied propylene to vaporize in the reactor; (d) polymerizing the vaporized propylene in the reactor; (e) discharging a mixture of the molten atactic, substantially amorphous, tacky homopolymer and the gaseous propylene from the reactor; and (f) separating the molten atactic, substantially amorphous, tacky homopolymer from the gaseous propylene; wherein the reactor is maintained at 300 to 450Â° F. and at a pressure of 600 to 5000 psig; and wherein the catalyst system consists essentially of (a) a transition metal halide catalyst selected from the group consisting of (i) a titanium trihalide, (ii) a titanium halide on a comminuted magnesium halide support, and (iii) a titanium halide sandwich compound and (b) an aluminum alkyl.