Process for the preparation of cyclized polymeric dienes

Details Process for the preparation of cyclized polymeric dienes Process for the preparation of cyclized polymeric dienes

1979-10-18

1981-02-03

Levin, Stanford M.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

525334, 525387, 526140, 526144, 526335, 526339, 526340, C08F 426, C08F 480

Patent

active

042489881

ABSTRACT:
The process described herein comprises the polymerization of a conjugated diene, such as butadiene-1,2, isoprene, etc., in an anhydrous hydrocarbon solution and in intimate contact with a catalyst system comprising a cobalt or nickel component, a hydrocarbyl aluminum compound and a halogenated hydrocarbon, such as CCl.sub.4, CH.sub.2 Cl.sub.2, CBr.sub.4, CHCl.sub.3, CHBr.sub.3, etc., containing 1-10 carbon atoms and 1-6 halogen atoms per molecule, with at least one of said halogen atoms being attached to an aliphatic carbon atom. Analysis shows that the polymer product has cyclic structure and this is confirmed by the determination of residual unsaturation which is found generally to be less than 20 percent of the normal unsaturation of the polymeric diene. The products are useful in molding compositions.

REFERENCES:
patent: 3428699 (1969-02-01), Schleimer
patent: 3560459 (1971-02-01), Kennedy
patent: 3814744 (1974-06-01), Yagi et al.
patent: 4176219 (1979-11-01), Makino et al.

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