Process and catalyst system for synthesizing trans-1,4-polybutad

Details Process and catalyst system for synthesizing trans-1,4-polybutad Process and catalyst system for synthesizing trans-1,4-polybutad

1990-05-29

1991-03-05

Teskin, Fred

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526173, 526175, 526181, 526335, 502153, C08F 428, C08F 206

Patent

active

049978969

ABSTRACT:
Trans-1,4-polybutadiene is a thermoplastic resin rather than a rubber at room temperature by virtue of its high degree of crystallinity. Because trans-1,4-polybutadiene contain many double bonds 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, trans-1,4-polybutadiene can be synthesized at a high level of conversion. This invention specifically relates to a process for the synthesis of trans-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.degree. C. to about 50.degree. C. to produce the trans-1,4-polybutadiene.

REFERENCES:
patent: 4647635 (1987-03-01), Hall
patent: 4672097 (1987-06-01), Hall

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