Patent ID: 8329848

Claim:
An ethylenic copolymer (A) obtained by copolymerizing only ethylene and 1-butene, and satisfying the following requirements (a) to (d): (a) the number of vinyl groups per 1000 carbon atoms being 0.06 to 1, as measured by infrared absorption spectroscopy, (b) a MFR 10 /MFR 2.16 , which represents ratio between a melt flow rate measured at 190° C. under a load of 10 kg in accordance with ASTM D1238 and a melt flow rate measured at 190° C. under a load of 2.16 kg in accordance with ASTM D1238, being 7.7 or less, (c) a density being 0.850 to 0.910 g/cm 3 , (d) the MFR 2.16 being 0.1 to 25 g/10 min, and wherein the ethylene content of the ethylenic copolymer (A) is 80 to 95% by mole in the total constitutional units.