Process for manufacturing vinyl-rich polybutadiene rubber

Details Process for manufacturing vinyl-rich polybutadiene rubber Process for manufacturing vinyl-rich polybutadiene rubber

2007-03-06

2007-03-06

Teskin, Fred (Department: 1713)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S169100, C526S335000, C526S907000

Reexamination Certificate

active

10900063

ABSTRACT:
This invention relates to A process for manufacturing a vinyl-rich polybutadiene rubber, comprising polymerizing butadiene in a solvent using a catalyst system comprising an iron-based catalyst as catalyst and a phosphite as ligand, said catalyst system comprising: (A) an organoiron compound; (B) an organoaluminum compound; and (C) a phosphite selected from a group consisting of dialkyl phosphite, trialkyl phosphite, diaryl phosphite, triaryl phosphite and mixtures thereof; wherein, the mole ratio of component B to component A is 5:100; and that of component C to component A is 0.5:10; and 80 wt % of macromolecules of the rubber have a vinyl group.

REFERENCES:
patent: 3419505 (1968-12-01), Marsico
patent: 6211313 (2001-04-01), Luo
patent: 6399732 (2002-06-01), Luo
patent: 6720397 (2004-04-01), Luo
NIST Chemistry WebBook, Standard Reference Database No. 69, Jun. 2005, entry for Phosphonic Acid, diethyl ester.
Rubber Technology, 3d ed. (M. Morton ed.), Van Nostrand Reinhold, NY, 1987, pp. 235, 241.

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