Process for the synthesis of crystallizable 3,4-polyisoprene and

Details Process for the synthesis of crystallizable 3,4-polyisoprene and Process for the synthesis of crystallizable 3,4-polyisoprene and

1992-08-17

1993-08-24

Teskin, Fred

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526 92, 526 93, 526337, 5263402, C08F 470, C08F 3608

Patent

active

052390233

ABSTRACT:
Crystallizable 3,4-polyisoprene and isoprene-butadiene copolymers having high vinyl contents can be synthesized in organic solvents to quantitative yields after short polymerization times by utilizing the catalyst systems of this invention. The 3,4-polyisoprene made utilizing this catalyst system is strain crystallizable and can be employed in tire treads which provide improved traction and improved cut growth resistance. This invention specifically discloses a process for the synthesis of 3,4-polyisoprene which comprises polymerizing isoprene monomer in an organic solvent at a temperature which is within the range of about -10.degree. C. to about 100.degree. C. in the presence of a catalyst system which is comprised of (a) an organoiron compound which is soluble in the organic solvent, wherein the iron in the organoiron compound is in the +3 oxidation state, (b) a partially hydrolyzed organoaluminum compound which was prepared by adding a protonic compound selected from the group consisting of water, alcohols and carboxylic acids to the organoaluminum compound, and (c) a chelating aromatic amine; wherein the molar ratio of the chelating amine to the organoiron compound is within the range of about 0.1:1 to about 1:1, wherein the molar ratio of the organoaluminum compound to the organoiron compound is within the range of about 5:1 to about 200:1, and wherein the molar ratio of the protonic compound to the organoaluminum compound is within the range of about 0.001:1 to about 0.2:1.

REFERENCES:
patent: 3678022 (1972-07-01), Bozik et al.
patent: 3725373 (1973-04-01), Yoo
patent: 3860568 (1975-01-01), Chabert et al.
patent: 3936432 (1976-02-01), Throckmorton
patent: 4507451 (1985-03-01), Freppel
patent: 5061765 (1991-10-01), Hsu et al.
patent: 5082906 (1992-01-01), Hsu et al.
Sun and Wang, 2 Acta Polymerica Sinica 145 (1988).

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