Catalyst for the synthesis of crystalline 3,4-polyisoprene

Details Catalyst for the synthesis of crystalline 3,4-polyisoprene Catalyst for the synthesis of crystalline 3,4-polyisoprene

1990-10-24

1992-01-21

Garvin, Patrick P.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

502117, 526141, 5263486, C08F 470

Patent

active

050829068

ABSTRACT:
Crystallizable 3,4-polyisoprene 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 composed of (a) an organoiron compound, (b) an organoaluminum compound, (c) a chelating aromatic amine, and (d) a protonic compound; 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: 3860568 (1975-01-01), Chabert et al.
patent: 3936432 (1976-02-01), Throckmorton
patent: 4507451 (1985-03-01), Freppel
Sun and Wang, 2 Acta Polymerica Sinica 145 (1988).

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