Adhesive ethylene copolymer resin compositions and laminates using the same

An adhesive ethylene copolymer resin composition comprising a blend of:

• 50 to 95% by weight of a modified ethylene/α-olefin copolymer (E2) obtained by graft-modifying an unmodified linear ethylene/α-olefin copolymer (E1) comprising ethylene and an α-olefin of 3 to 20 carbon atoms with an unsaturated carboxylic acid or its derivative, or 50 to 95% by weight of the unmodified ethylene/α-olefin copolymer (E1) and the modified ethylene/α-olefin copolymer (E2), said linear ethylene/α-olefin copolymer (E1) being prepared by the use of an olefin polymerization catalyst comprising a Group IV transition metal compound (a) containing a ligand having cyclopentadienyl skeleton and an organoaluminum oxy-compound (b), and
• 5 to 50% by weight of an olefin elastomer (F);
• wherein the unmodified ethylene/α-olefin copolymer (E1) is a linear ethylene/α-olefin copolymer having the following properties:
• the density (d) is in the range of 0.900 to 0.965 g/cm3,
• the melt flow rate (MFR) at 190° C. under a load of 2.16 kg is in the range of 0.01 to 200 g/10 min,
• the temperature (Tm) in °C. at the position of the maximum peak of an endotherm curve of the copolymer measured by a differential scanning calorimeter (DSC) and the density (d) satisfy the relation
• Tm<400×d−250,
• the melt tension (MT) in grams and the melt flow rate (MFR) at 190° C. satisfy the relation
• MT≦2.2×MFR−0.84, and
• the quantity fraction (W) in % by weight of a decane-soluble component of the copolymer at 23° C. and the density (d) satisfy the relation
• in the case of MFR≦10 g/10 min:
• W<80×exp(−100(d−0.88))+0.1, and
• in the case of MFR>10 g/10 min:
• W<80×(MFR−9)0.26×exp(−100(d−0.88))+0.1;
• and
• the olefin elastomer (F) has the following properties:
• the density (d) is in the range of 0.850 to 0.895 g/cm3,
• the melt flow rate (MFR) at 190° C. under a load of 2.16 kg is in the range of 0.01 to 200 g/10 min, and
• the crystallinity, as measured by X-ray diffractometry, is less than 30%.