Terpolymers of Ethylene, 1,3-Butadiene and an Aromatic a-Monoolefin

A terpolymer of ethylene, of 1,3-butadiene and of an aromatic α-monoolefin is provided. The terpolymer contains Such a diene terpolymer rich in ethylene units has the advantage of exhibiting a reduced, or even zero, crystallinity.