| 摘要 |
<p>Solid, amorphous, unsaturated, substantially linear copolymers of ethylene, at least one olefin of the formula CH2=CHR wherein R represents an alkyl group containing from 1-6 carbon atoms, and at least one conjugated diolefin containing at least one vinyl double bond in the molecule are made by copolymerizing a mixture of the monomers in the presence of an inert solvent and a catalyst prepared by contacting a compound of a metal of Group IV(A), V(A), or VI(A) of the Mendeleeff Periodic Table and which is soluble in the solvent, with an organo-metallic compound of a metal of Group II or of aluminium. The catalyst is preferably vanadium tetrachloride or oxychloride in conjunction with a trialkyl aluminium compound such as trihexyl aluminium. The olefin of the given formula may be propylene and the di-olefine isoprene. The copolymers may be vulcanized with conventional vulcanizers and accelerators. Specification 836,790 is referred to.</p> |
