Method for preparing highly crystalline polypropylene

Claim 1

A METHOD OF PREPARING A POLYPROPYLENE POLYMER WHICH COMPRISES REACTING A TITANIUM TETRAHALIDE WITH THE THEORETICAL AMOUNT OF AN ALUMINUM TRIALKYL IN THE PRESENCE OF A HYDROCARBON DILUENT SELECTED FROM THE CLASS CONSISTING OF NAPHTHENIC HYDROCARBONS AND MIXTURES THEREOF WITH NO MORE THAN 20 WEIGHT PERCENT OF ISOPARAFFINIC HYDROCARBONS, SAID DILUENT BEING SUBSTANTIALLY FREE OF N-PARAFFINS AND AROMATICS AND HAVING A VISCOSITY BETWEEN 90 AND 400 SECONDS AT 37.5*C., A BOILING POINT IN THE RANGE OF 250* TO 500*C. AND AN API GRAVITY OF 28 TO 32 TO REDUCE THE VALENCE OF SAID HALIDE TO THE NEXT LOWER LEVEL, SLOWLY HEATING THE REACTION PRODUCT TO A TEMPERATURE BETWEEN 100 AND 300*C. UNTIL IT BECOMES CRYSTALLINE, COMBINING THE REACTION PRODUCT WITH AN ALUMINUM ALKYL ACTIVATOR AND POLYMERIZING THE OLEFIN WITH SAID ACTIVATED REACTION PRODUCT UNDER A LOW PRESSURE IN THE PRESENCE OF A HYDROCARBON DILUENT AS PREVIOUSLY DESCRIBED.

Claim 2

A METHOD OF PREPARING A POLYPROPYLENE POLYMER WHICH COMPRISES REACTING A TITANIUM TETRAHALIDE WITH THE THEORETICAL AMOUNT OF AN ALUMINUM TRIALKYL IN THE PRESENCE OF A HYDROCARBON DILUENT SELECTED FROM THE CLASS CONSISTING OF NAPHTHENIC HYDROCARBONS AND MIXTURES THEREOF WITH NO MORE THAN 20 WEIGHT PERCENT OF ISOPARAFFINIC HYDROCARBONS, SAID DILUENT BEING SUBSTANTIALLY FREE OF N-PARAFFINS AND AROMATICS AND HAVING A VISCOSITY BETWEEN 90 AND 400 SECONDS AT 37.5*C., A BOILING POINT IN THE RANGE OF 250* TO 500*C. AND AN API GRAVITY OF 28 TO 32 TO REDUCE THE VALENCE OF SAID HALIDE TO THE NEXT LOWER LEVEL, SLOWLY HEATING THE REACTION PRODUCT TO A TEMPERATURE BETWEEN 100 AND 300*C. UNTIL IT BECOMES CRYSTALLINE, COMBINING THE REACTION PRODUCT WITH AN ALUMINUM ALKYL ACTIVATOR AND POLYMERIZING THE OLEFIN WITH SAID ACTIVATED REACTION PRODUCT UNDER A LOW PRESSURE IN THE PRESENCE OF A HYDROCARBON DILUENT AS PREVIOUSLY DESCRIBED.