PROCEDURE FOR THE FORMULATION OF A CATALYST FOR THE MANUFACTURE OF CIS-1,4-POLYBUTADIENE OF CONTROLLABLE MOLECULAR WEIGHT

摘要

The invention is a two-step procedure for the formulation of a mixed catalyst of a nickel compound preferably with diene addition, boron trifluoride and an organo-aluminum compound, for the synthesis of cis-1,4-polybutadiene rubber, in which in each case, in a first step boron trifluoride was reacted as an etherate complex (BF3OEt2) with triethyl-aluminum (AlEt3) in toluene, with a contact time in each case of between 10 and 120 minutes; the active component of the catalyst formulation here was the amorphous AlF3 formed and where in a second step nickel carboxylate-also in toluene- was added to the mixture. The procedure is suitable for the synthesis of cis-1,4-polybutadiene rubber with a high cis-1,4 content and a molecular weight controllable over a wide range, with the goal of minimizing gel formation during the polymerization process.