Patent ID: 8901238
Filing Date: 2014-12-02
Classification: C08F,C08L,Y10S

Abstract:
1. A process for continuously making tetrapolymers, comprising ethylene monomers, propylene monomers, and diene monomers, comprising: a. introducing a saturated hydrocarbon stream; b. introducing a propylene monomer to the saturated hydrocarbon stream at a rate sufficient to achieve propylene content in a final product of 32 percent to 36 percent of total weight; c. introducing hydrogen gas to the saturated hydrocarbon stream at a rate sufficient to control the molecular weight of the final product; d. introducing a first diene to the saturated hydrocarbon stream at a rate sufficient to achieve desired first diene content in the final product; e. introducing a second diene to the saturated hydrocarbon stream at a rate sufficient to achieve desired second diene content in the final product; f. introducing an ethylene monomer to the saturated hydrocarbon stream at a rate sufficient to initiate the polymerization reaction and achieve ethylene content in a final product of 53 percent to 59 percent of total weight; g. cooling the saturated hydrocarbon stream, the propylene monomer, hydrogen gas, the first diene, the second diene, and the ethylene monomer to below 35 degrees Celsius to create a cooled mixture; h. concurrently introducing a Ziegler-Natta catalyst, a co-catalyst, and optionally a promoter into a continuous flow reactor, wherein: i. reacting the cooled mixture, the Ziegler-Natta catalyst, the co-catalyst, the promoter if used, the first diene, and the second diene for 30 minutes to 60 minutes, at a temperature from 35 degrees Celsius to 65 degrees Celsius, and a pressure from 190 psig to 230 psig; and j. forming a resultant tetrapolymer as the final product.