Patent ID: 7354655

Claim:
An adhesive resin composition (III) comprising: (I) 10 to 90% by mass of a modified polyethylene in which an unsaturated carboxylic acid and/or an unsaturated carboxylic acid derivative unit is grafted to a high molecular weight polyethylene with a melt flow rate (MFR: temperature 190Â° C., loading 2.16 kg) of 0.1 to 2.0 g/10 minutes, and a density of 0.91 to 0.96 g/cm 3 , which is at least one of (a) a modified high density polyethylene with a melt flow rate of 0.1 to 2.0 g/10 minutes, and a density of 0.93 to 0.96 g/cm 3 , and (c) a modified linear low density polyethylene with a melt flow rate of 0.1 to 20 g/10 minutes, and a density of 0.91 or greater and less than 0.93 g/cm 3 , and (II) 10 to 90% by mass of an unmodified polyethylene with a melt flow rate (MFR: temperature 190Â° C., loading 2.16 kg) of 0.1 to 20 g/10 minutes, and a density of 0.86 to 0.96 g/cm 3 , which is at least one of (bâ€²) an unmodified high density polyethylene with a melt flow rate of 0.1 to 20 g/10 minutes, and a density of 0.93 to 0.96 g/cm 3 , (câ€²) an unmodified linear low density polyethylene with a melt flow rate of 0.1 to 20 g/10 minutes, and a density of 0.91 or greater and less than 0.93 g/cm 3 , and (dâ€²) an unmodified ultra low density polyethylene with a melt flow rate of 0.1 to 20 g/10 minutes, and a density of 0.86 to 0.91 g/cm 3 , and wherein a ratio MFR(I)/MFR(II), where MFR(I) represents a melt flow rate (MFR: temperature 190Â° C., loading 2.16 kg) of said modified polyethylene (I) and MFR(II) represents a melt flow rate (MFR: temperature 190Â° C., loading 2.16 kg) of said unmodified polyethylene (II), is less than 1,and wherein at least one of (c) the modified linear low density polyethylene, (câ€²) the unmodified linear low density polyethylene, and (dâ€²) the unmodified ultra low density polyethylene is produced using a single site catalyst, wherein said at least one of (c) a modified linear low density polyethylene, (câ€²) an unmodified linear low density polyethylene, and (dâ€²) an unmodified ultra low density polyethylene produced using a single site catalyst is present in said composition, and wherein a density of said adhesive resin composition (III) is 0.925 to 0.940 g/cm 3 , a content of said unsaturated carboxylic acid and/or unsaturated carboxylic acid derivative unit incorporated therein is at least 0.09% by mass, and a melt flow rate (MFR: temperature 190Â° C., loading 2.16 kg) is from 0.1 to 2 g/10 minutes.