Patent ID: 7335716

Claim:
An ethylene (co) polymer (A1) being either an ethylene homopolymer or a copolymer of ethylene and an α-olefin of 4 to 20 carbon atoms, wherein (i A1 ) the ethylene (co)polymer contains methyl branches less than 0.1 in number per 1,000 carbon atoms measured by 13 C-NMR, and (ii A1 ) the ethylene (co)polymer has a ratio of Mw/Mn (Mw denotes the weight average molecular weight; Mn denotes the number average molecular weight) measured by gel permeation chromatography is not lower than 1.8 and lower than 4.5 wherein (iii A1 ) the intrinsic viscosity measured at 135° C. in decalin is within a range of 0.2 to 18 dl/g, and (iv A1 ) the number of branches having a length equivalent to that of hexyl or longer measured by 13 C-NMR is less than 0.1 per 1,000 of carbon atoms, (v A1 ) the intrinsic viscosity [η] in dl/g measured at 135° C. in decalin and the melt flow rate MFR in g/10 minutes measured under 2.16 load at 190° C. satisfy the following relations: [η] >1.85 x MFR −0.192 when MFR<1, and [η] >1.85 x MFR −0.213 when MFR ≧1.