Star-shape High 1, 4-cis Polybutadiene

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The present invention refers to the presence of a non-polar solvent with rare earth organic acid salt, a compound containing halogen, and organo-aluminum compounds and organic using a catalyst comprising a 1, 3-such as butadiene or butadiene derivatives by polymerisation having 95% or more high 1, 4-cis content while retaining the linearity time of a steam heater and then polymer 3 halogen annotation or more functional groups, isocyanate, and a selected compounds the claw which will know the id 1 after at least one is added catalyst and a stabilizing agent, a high 1, 4-cis-polybutadiene having controlled molecular weight further active discharging commodities by throwing a reacting star high 1, 4-cis-polybutadiene having controlled molecular weight which can provide a method for producing, while retaining the linearity is the same physical property as the may have a molecular structure of a low productivity but excellent cold flow which poor storage stability is highly linearity low workability rare earth-polybutadiene produced to overcome disadvantages of lowering the viscosity solution process modifier plastic, moreover, improve productivity of can be coating the parabolic antenna with chromium.