Process for controlling degree of branch of high 1,4-cis polybutadiene
AssigneeKorea Kumho Petrochemical Co., Ltd.
InventorsYoung-Chan Jang, Pil-Sung Kim, Gwang-Hoon Kwag, A-Ju Kim, Seung-Hwon Lee
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Abstract
Disclosed is a process of controlling the degree of branch of high 1,4-cis polybutadiene without any alternation in the 1,4-cis content and the polymerization yield, in which a dialkylzinc compound represented by the following formula I is added in a controlled amount as an agent for controlling the degree of branch of high 1,4-cis polybutadiene, thus guaranteeing the optimum processability and physical properties of polymer according to the use purpose. R1—Zn—R2 Formula I wherein R1 and R2 are same or different and include an alkyl group containing 1 to 5 carbon atoms.
Claims8
A process for controlling the degree of branch of high 1,4-cis polybutadiene, in which 1,3-butadiene is polymerized in a non-polar solvent using a catalyst prepared by aging a mixture of organo-nickel compound, boron trifluoride (BF3) compound and organo-aluminum compound with or without a conjugate diene compound, the process being characterized by adding to the mixture a dialkylzinc compound as an agent for controlling the degree of branch, said dialkylzinc compound being represented by the following formula
- R1—Zn—R2
- wherein R1 and R2 are same or different and include an alkyl group containing 1 to 5 carbon atoms.
Dependencies are inferred from the claim text.