Adhesive ethylene copolymer resin compositions and laminates using the same

An adhesive ethylene copolymer resin composition (IIb) comprising:

• 50 to 95% by weight of a long-chain branched ethylene/α-olefin copolymer (A1) comprising ethylene and an α-olefin of 3 to 20 carbon atoms, said long-chain branched ethylene/α-olefin copolymer (A1) being prepared by the use of an olefin polymerization catalyst comprising a Group IV transition metal compound (a) containing a ligand having cyclopentadienyl skelton and an organoaluminum oxy-compound (b),
• 4 to 40% by weight of an ethylene/vinyl acetate copolymer (D), and
• 1 to 30% by weight of at least one component selected from the group consisting of
• an ethylene homopolymer (C1) prepared by the use of an olefin polymerization catalyst comprising a Group IV transition metal compound and organoaluminum compound, an ethylene/α-olefin copolymer (C2) comprising ethylene and an α-olefin of 3 to 20 carbon atoms, which is prepared by the use of the same catalyst as for the copolymer (C1),
• a modified ethylene homopolymer (C3) obtained by graft-modifying the ethylene homopolymer (C1) with an unsaturated carboxylic acid or its derivative, and
• a modified ethylene/α-olefin copolymer (C4) obtained by graft-modifying the ethylene/α-olefin copolymer (C2) with an unsaturated carboxylic acid or its derivative,
• said composition (IIb) containing at least one component selected from the group consisting of the modified ethylene homopolymer (C3) and the modified ethylene/α-olefin copolymer (C4);
• wherein the ethylene/α-olefin copolymer (A1) has the following properties:
• a density (d2) in the range of 0.850 to 0.895 g/cm3,
• a melt flow rate (MFR2) at 190° C. under a load of 2.16 kg in the range of 0.01 to 200 g/10 min a melt tension (MT(g)) and the melt flow rate (MFR2) at 190° C. satisfy the following relation
• MT>1.55×MFR2−1.09,
• and
• the ratio (MFR10/MFR) of the melt flow rate (MFR10) at 190° C. under a load of 10 kg to the (MFR2) at 190° C. under a load of 2.16 kg in the range of 7 to 50,
• the ethylene/vinyl acetate copolymer (D) has the following properties:
• a melt flow rate (MFR5) at 190° C. under a load of 2.16 kg in the range of 0.1 to 50 g/10 min, and
• the vinyl acetate content is in the range of 5 to 40% by weight;
• the ethylene homopolymer (C1) and the ethylene/α-olefin copolymer (C2) have the following properties:
• both having a density (d3) in the range of 0.900 to 0.970 g/cm3 and
• a melt flow rate (MFR3) at 190° C. under a load of 2.16 kg in the range of 0.01 to 100 g/10 min, and
• the crystallinity, as measured by X-ray diffractometry, is not less than 30%;
• and
• the composition (IIb) has the following properties:
• a density (d7) in the range of 0.870 to 0.900 g/cm3,
• a melt flow rate (MFR7) at 190° C. under a load of 2.16 kg in the range of 0.1 to 100 g/10 min,
• the crystallinity, as measured by X-ray diffractometry, is less than 30%, and
• the graft quantity based on the total amount of the composition (IIb) is in the range of 0.0001 to 5% by weight.