Patent ID: 6183863
Filing Date: 2001-02-06
Classification: B29K,B32B,C08F,C08L,C09J,Y10T

Abstract:
An adhesive ethylene copolymer resin composition comprising a blend of:50 to 95% by weight of a modified ethylene/.alpha.-olefin copolymer (E2) obtained by graft-modifying an unmodified linear ethylene/.alpha.-olefin copolymer (E1) comprising ethylene and an .alpha.-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/.alpha.-olefin copolymer (E1) and the modified ethylene/.alpha.-olefin copolymer (E2), said linear ethylene/.alpha.-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), and5 to 50% by weight of an olefin elastomer (F);wherein the unmodified ethylene/.alpha.-olefin copolymer (E1) is a linear ethylene/.alpha.-olefin copolymer having the following properties:the density (d) is in the range of 0.900 to 0.965 g/cm.sup.3,the melt flow rate (MFR) at 190.degree. C. under a load of 2.16 kg is in the range of 0.01 to 200 g/10 min,the temperature (Tm) in .degree.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 relationTm<400.times.d-250,the melt tension (MT) in grams and the melt flow rate (MFR) at 190.degree. C. satisfy the relationMT.ltoreq.2.2.times.MFR.sup.-0.84, andthe quantity fraction (W) in % by weight of a decane-soluble component of the copolymer at 23.degree. C. and the density (d) satisfy the relationin the case of MFR.ltoreq.10 g/10 min:W<80.times.exp(-100(d-0.88))+0.1, andin the case of MFR>10 g/10 min:W<80.times.(MFR-9).sup.0.26.times.exp(-100(d-0.88))+0.1; andthe olefin elastomer (F) has the following properties:the density (d) is in the range of 0.850 to 0.895 g/cm.sup.3,the melt flow rate (MFR) at 190.degree. C. under a load of 2.16 kg is in the range of 0.01 to 200 g/10 min, andthe crystallinity, as measured by X-ray diffractometry, is less than 30%.