Birch, Stewart, Kolasch & Birch, LLP
Process for preparing polybutadiene using catalyst with high activity
 This invention relates to a process for preparing polybutadiene with high 1,4-cis content (over 97%) and high conversion (over 90%) in such a manner that 1,3-butadiene is polymerized using an aging catalyst, which has high homogeneity due to its excellent solubility in non-polar solvents, resulting in producing polybutadiene having low gel content and low solution viscosity. The aging catalyst is a mixture of a neodymium compound, an organoaluminum compound and a borontrifluoride complex, which is represented by the formula I or the formula II, in the presence or absence of a small portion of conjugated diene compound: Formula I is represented by EQU BF.sub.3 OR.sub.1 R.sub.2 PA1 wherein R.sub.1 and R.sub.2 can be the same or different, and are independent substituents, respectively which are alkyl, cycloalkyl, allyl, aryl or arylalkyl groups containing from 1 to 10 carbon atoms; and Formula II is represented by ##STR1## wherein R.sub.3 is an alkyl group containing from 2 to 10 carbon atoms. 
Korea Kumho Petrochemical Co., Ltd.
C
C08F
inventional
Gwang Hoon Young Chan A Ju Seung Hwon
Kwag Jang Kim Lee