In accordance with the present invention, there are provided ethylene copolymers composed of structural units (a) derived from ethylene and structural units (b) derived from .alpha.-olefin of 3.about.20 carbon atoms, said ethylene copolymers having ...http://www.google.es/patents/US5714426?utm_source=gb-gplus-sharePatente US5714426 - Olefin polymerization catalyst
