Process for preparing cis-polyisoprene

Details Process for preparing cis-polyisoprene Process for preparing cis-polyisoprene

1977-01-19

1978-12-05

Holler, Alan

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526159, 526335, 5263402, C08F 464, C08F 3608

Patent

active

041287088

ABSTRACT:
A process for preparing cis-polyisoprene which comprises polymerization of isoprene in a medium of a non-polar hydrocarbon solvent at a temperature ranging from 0.degree. to 60.degree. C in the presence of a catalyst comprising a reaction product of titanium tetrachloride and an intracyclic organo-aluminium compound having the formula: ##STR1## wherein R, the same or different, are H, CH.sub.3 ; taken in a molar ratio of 1:1.05-1.1 respectively; weight ratio of isoprene to said catalyst being equal to 100:0.2-0.7.
The present invention makes it possible to improve the quality of the thus-obtained cis-polyisoprene and to increase the catalyst capacity by two times due to modification of its properties.

REFERENCES:
patent: 3127386 (1964-03-01), Saltman
patent: 3180858 (1965-04-01), Farrar, Jr.
patent: 3281404 (1966-10-01), Natta et al.
patent: 3311604 (1967-03-01), Marconi et al.
patent: 3455891 (1969-07-01), Winkler et al.
patent: 3580899 (1971-05-01), Massoubre
patent: 3607854 (1971-09-01), Antropiusova et al.

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