Stereoregular polymerization of 1-olefins in monomer solution

Claim 1

A APROCESS FOR PRODUCING A TACTIC COPOLYMER THAT COMPRISES: CONTACTING, IN THE LIQUID PHASE, A 1-OLEFIN MAIN MONOMER HAVING 1 TO 10 CARBON ATOMS ADMIXED WITH UP TO 20 MOLE PERCENT OF COMONOMER SELECTED FROM THE GROUP CONSISTING OF PROPYLENE AND ETHYLENE, WITH A CATALYST STSTEM COMPRISING COMPONENT A, A COMPOUND OF A TRANSITIONAL METAL OF GROUPS IV-A, V-A, VI-A AND VIII OF THE PERIODIC ARRANGEMENT OF THE ELEMENTS WHEREIN THE METAL IS IN A VALENCE STATE LOWER THAN ITS MAXIMUM, AND AT LEAST ONE COMPONENT B, ORGANOMETALLIC COMPOUND OF METALS OF GROUPS II AND III OF THE PERIODIC ARRANGEMENT OF THE ELEMENTS; THE AMOUNT OF I-OLEFIN MAIN MONOMER BEING IN EXCESS, OVER THE AMOUNT OF I-OLEFIN MAIN MONOMER THAT WILL REACT WITH THE CATALYST SYSTEM TO FORM TACTIC COPOLYMER, SUFFICIENT TO FORM A SOLUTION OF TACTIC COPOLYMER IN THE LIQUID 1-OLEFIN MAIN MONOMER HAVING A CONCENTRATION NOT GREATER THAN ABOUT 30 WEIGHT PERCENT TACTIC COPOLYMER; AND THE POLYMERIZATION TEMPERATURE BEING BETWEEN THE LOWER CLOUD POINT AND THE UPPER CLOUD POINT OF SAID TACTIC COPOLYMER IN SAID LIQUID I-OLEFIN MAIN MONOMER.