Catalyst system for synthesizing trans-1,4-polybutadiene

Details Catalyst system for synthesizing trans-1,4-polybutadiene Catalyst system for synthesizing trans-1,4-polybutadiene

C - Chemistry, Metallurgy

08

F

252/123, 402/651

C08F 4/46 (2006.01) C08F 4/50 (2006.01) C08F 136/06 (2006.01)

Patent

CA 2022500

Traps-1,4-polybutadiene is a thermoplastic resin rather than a rubber at room temperature by virtue of its high degree of crystallinity. Because traps-1,4-polybutadiene contains many double bands in its backbone, it can be blended and cocured with rubbers. It is accordingly an attractive alternative to conventional fillers such as carbon black, which are typically utilized in compounding rubber. By utilizing the catalyst system and techniques of this invention, traps-1,4-polybutadiene can be synthesized at a high level of conversion. This invention specifically relates to a process for the synthesis of traps-1,4-polybutadiene by an anionic polymerization process which comprises: (a) adding an alkali metal trialkylmagnesiate and an alkali metal alkoxide as a catalyst system to a polymerization medium containing 1,3-butadiene monomer and an organic solvent; and (b) allowing the 1,3-butadiene monomer to polymerize at a temperature which is within the range of about -10°C to about 50°C to produce the traps-1,4-polybutadiene.

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