Patent ID: 7563849

Claim:
A graft-modified ethylene (co)polymer (A1-1) produced by graft-modification of an ethylene (co)polymer (A1) with a polar group-containing monomer, wherein said 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.