Polymerization catalyst and process

Claim 1

A catalyst which forms on mixing: A. a catalyst component A formed by milling (1) a magnesium halide or manganous halide with (2) at least one catalyst adjuvant selected from (a) hydrocarbyl metal oxides of the formula M(OR) n wherein M is aluminum, boron, magnesium, titanium or zirconium, n is an integer representing the valence of M and ranges from 2-4, and R is a hydrocarbyl group having from 1 to 24 carbon atoms per molecule, (b) organo phosphites of the formula ##STR8## wherein R 2 is an aryl, aralkyl, alkaryl or haloaryl having from 6 to 20 carbon atoms, (c) aromatic phenols of the formula HOR 3 wherein R 3 is an aryl group containing from 6 to about 20 carbon atoms, (d) aromatic ketones of the formula ##STR9## wherein R 4 is a thiophene, aryl or alkyl group and R 5 is an aryl group containing from 6 to 20 carbon atoms, (e) organo silanols of the formula ##STR10## wherein R 6 , R 7 , R 8 are the same or different and are hydrocarbyl groups containing from 4-20 carbon atoms, (f) organo phosphates and phosphines of the formula ##STR11## wherein each R is the same or different hydrocarbyl or hydrocarbyloxy group containing from 1 to 20 carbon atoms, (g) oxygenated terpenes selected from among carvone, dihydrocarvone, carvenone and carvomenthane, (h) triarylphosphites having from 6 to 24 carbon atoms in each aryl group, and (i) halogen-containing organo phosphorus compounds of the formula PX 3-a (OR 3 ) a , ##STR12## where R 3 is an aryl group containing from 6 to 20 carbon atoms, X is a halogen, a is 1 or 2, and b is 0 or 2 to form a milled composite wherein the molar ratio of (1) to (2) ranges from 4:1 to 100:1; (3) treating the composite thus obtained from (1) and (2) with a tetravalent titanium halide for a period of time sufficient to incorporate titanium tetrahalide on at least a portion of the surface of said milled composite; and B. a cocatalyst component B comprising at least one organoaluminum compound wherein the molar ratio of component B to titanium compound ranges from 0.5:1 to 2,000:1 and the amount of titanium present in the finished catalyst ranges from about 0.1 to about 10 weight percent based on the dry composite.