Magnesium reducing agent prepared in absence of complexing diluent milled with organoaluminum

Claim 1

A process comprising: reacting an organic halide of the formula RX or R'X 2 wherein X is a halogen atom, R is an alkynyl, alkenyl, alkyl, aryl, cycloalkenyl, or cycloalkyl radical or combination thereof having 1 to 12 carbon atoms per molecule, and R' is a saturated divalent aliphatic hydrocarbon radical containing from 2 to 10 carbon atoms per molecule and magnesium metal in the absence of any complexing diluent to form a magnesium reducing agent reaction mixture containing at least 10 weight percent each of a diorganomagnesium compound and a magnesium halide, the ratio of moles of said organic halide to atoms of said magnesium being within the range of 0.25:1 to 1:0.25; milling under intensive conditions wherein heat is generated and agglomerates are broken up using one of ball milling, rod milling, pebble milling, vibratory ball milling or colloid milling, the total magnesium reducing agent reaction mixture thus produced with an organoaluminum compound having the formula R" 2 AlX wherein X is a halogen and R" is an alkyl or aryl radical having 1 to 12 carbon atoms to give a milled cocatalyst product wherein the atom ratio of aluminum to magnesium is within the range of 0.1:1 to 4:1; and thereafter contacting said milled cocatalyst product with a titanium tetrahalide to give a catalyst wherein said catalyst has an atom ratio of aluminum to titanium within the range of 20:1 to 10,000:1.