Patent ID: 7186785
Filing Date: 2007-03-06
Classification: C08F,Y10S

Abstract:
1. A process for manufacturing a vinyl-rich polybutadiene rubber, comprising polymerizing butadiene in a solvent using a catalyst system comprising an iron-based catalyst as catalyst and a phosphite as ligand, said catalyst system comprising: A) an organoiron compound; B) an organoaluminum compound; and C) a phosphite selected from a group consisting of dialkyl phosphite, trialkyl phosphite, diaryl phosphite, triaryl phosphite and mixtures thereof; wherein, the mole ratio of component B to component A is between 5 and 100; and that of component C to component A is between 0.5 and 10; and 80 wt % or more monomer units of macromolecules of the rubber have a vinyl group, wherein the organoiron compound is selected from the group consisting of iron acetyl acetone, iron naphthenate, iron neodecanoate and iron-i-octanoate, wherein the addition sequence of the catalyst components is in the following order: first A, then B or C, then aged first in the presence of butadiene for 10 to 15 min, then the other B or C added singly, wherein the mole ratio of butadiene to component A is between 5 and 100, wherein during the premixing of A and B or C, the component A is first added, and then butadiene.