| abstract |
Wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are hydrogen atoms, hydrocarbon radicals having one to 20 carbon atoms, halogen atoms, or halogenated hydrocarbon radicals having one to 20 carbon atoms and containing at least one halogen atom as substituent, provided that R.sub.1, R.sub.2, and R.sub.4 have as a whole at least one halogen atom, with a coordinated catalyst comprising an organoaluminum compound of the formula, A1R''.sub.n X.sub.3.sub.-n, wherein R'' is a hydrocarbon radical having 1 to 20 carbon atoms, X is a halogen atom, and n is any number of from 1.5 to 3, and a transition metal compound selected from the group consisting of vanadium compounds and titanium compounds, the molar ratio of said organoaluminum compound to said transition metal compound being from 5 : 1 to 0.5 : 1. The rate of vulcanization of the said quadripolymer is freely controllable by varying the non-conjugated diene content thereof. A halogen-containing, sulfur-curable, normally amorphous quadripolymer is produced by contacting a mixture of (1) ethylene, (2) an .alpha.-olefin having the formula, R-CH=CH.sub.2 wherein R is a hydrocarbon radical having one to 20 carbon atoms, (3) a hydrocarbon compound having a plurality of non-conjugated unsaturated bonds capable of polymerizing with a coordinated catalyst, and (4) a halogenated norbornene compound represented by the formula, |