Patent ID: 6656601
Filing Date: 2003-12-02
Classification: B29K,B32B,C08F,C08L,C09J,Y10T

Abstract:
An adhesive ethylene copolymer resin composition(Ib) comprising:49 to 95% by weight of a long-chain branched ethylene/&agr;-olefin copolymer (A1) comprising ethylene and an &agr;-olefin of 3 to 20 carbon atoms, said long-chain branched ethylene/&agr;-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 skeleton and an organoaluminum oxy-compound (b), 1 to 50% by weight of a tackifier (B), 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 an organoaluminum compound, an ethylene/&agr;-olefin copolymer (C2) comprising ethylene and an &agr;-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/&agr;-olefin copolymer (C4) obtained by graft-modifying the ethylene/&agr;-olefin copolymer (C2) with an unsaturated carboxylic acid or its derivative, said composition (Ib) containing at least one component selected from the group consisting of the modified ethylene homopolymer (C3) and the modified ethylene/&agr;-olefin copolymer (C4); wherein the ethylene/&agr;-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 190Â° 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 190Â° C. satisfy the following relation MT>1.55Ã—MFR2âˆ’1.09, â€ƒand the ratio (MFR10/MFR2) of the melt flow rate (MFR10) at 190Â° C. under a load of 10 kg to the (MFR2) at 190Â° C. under a load of 2.16 kg in the range of 7 to 50, the ethylene homopolymer (C1) and the ethylene/&agr;-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 190Â° 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 (Ib) has the following properties: a density (d4) in the range of 0.870 to 0.900 g/cm3, a melt flow rate (MFR4) at 190Â° C. under a load of 2.16 kg in the range of 0.01 to 100 g/10 min, the crystallinity, as measured by X-ray diffractometry, is less than 40%; and the graft quantity based on the total amount of the composition (Ib) is in the range of 0.0001 to 5% by weight.