Technique for reducing the molecular weight and improving the pr

Details Technique for reducing the molecular weight and improving the pr Technique for reducing the molecular weight and improving the pr

1994-12-05

1995-09-19

Teskin, Fred

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526133, 526141, 5261691, 5263404, 526907, 524722, 524856, C08F 470, C08F13606

Patent

active

054516463

ABSTRACT:
Cis-1,4-polybutadiene can be synthesized by polymerizing 1,3-butadiene monomer with a three component nickel catalyst system containing (a) an organonickel compound, (b) an organoaluminum compound, and (c) a fluorine containing compound. However, the molecular weight of the cis-1,4-polybutadiene prepared is typically too high to be utilized as a non-oil extended rubber. This invention is based upon the discovery that para-styrenated diphenylamine acts to reduce the molecular weight and to improve the processability of cis-1,4-polybutadiene prepared with such nickel based catalyst systems. The use of para-styrenated diphenylamine as a modifier in such polymerizations does not change the microstructure of the cis-1,4-polybutadiene produced. Accordingly, the present invention specifically discloses a process for producing cis-1,4-polybutadiene having a reduced molecular weight and improved processability which comprises polymerizing 1,3-butadiene in the presence of (a) an organonickel compound, (b) an organoaluminum compound, (c) a fluorine containing compound, and (d) para-styrenated diphenylamine; wherein the organoaluminum compound and the fluorine containing compound are brought together in the presence of the para-styrenated diphenylamine. Since para-styrenated diphenylamine is an excellent antidegradant, it also provides the rubber synthesized in its presence with antioxidant protection.

REFERENCES:
patent: 4383097 (1983-05-01), Castner et al.
patent: 5100982 (1992-03-01), Castner

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