Abstract: Ethylene copolymers composed of ethylene units and units composed of at least one other 1-olefin whose density is from 0.940 to 0.955 g/cm3, whose vinyl end group content is at least 0.5 end groups, based on 1000 carbon atoms, whose tensile impact strength atn, measured to ISO 8256 (1997)/1A at ?30° C., is greater than or equal to 145 kJ/m2, and whose content of comonomer side chains per 1000 carbon atoms Cx is above a value defined via equation I, Cx=128.7?134.62 d? (I), where d? is the density d of the copolymer in g/cm3, and a process for their preparation, and their use as blow-molded products.