An ethylene-based copolymer is useful as a modifier for resins, e.g., polypropylene,
and can be used in an ethylene/-olefin copolymer composition containing
the same ethylene-based copolymer. The inventive copolymer is characterize by:
(a-1) having temperature (Tm) at the maximum peak in the endothermic curve, measured
by a differential scanning calorimeter (DSC), of 40 to 90 C., (a-2) containing
the component soluble in decane at normal temperature at 1 to 70% b weight, and
(a-3) containing the component soluble in decane at normal temperature which comprises
(i) a recurring unit derived from ethylene and (ii) a recurring unit derived from
an -olefin of 4 or more carbon atoms, and in which a content of (i) the
recurring unit derived from ethylene is 50 to 75% by mole.
