Patent ID: 6210765
Filing Date: 2001-04-03
Classification: C08L,C09J,Y10T

Abstract:
A multi-layer laminated film which is a laminate of 3 or more layers comprising an ethylene polymer layer (I) comprising an ethylene polymer having an ethylene content of not less than 70% by mol, an adhesive layer (II) comprising an adhesive polyethylene composition, and either of a polyamide resin layer (III), an ethylene/vinyl alcohol copolymer layer (IV) or a layer (V) of a mixture of a polyamide resin and an ethylene/vinyl alcohol copolymer, superposed in this order,wherein said adhesive polyethylene composition consists essentially of:a modified ethylene/.alpha.-olefin copolymer resin (A2) or a modified ethylene/.alpha.-olefin copolymer elastomer (B2), wherein the modified resin or modified elastomer is obtained by modifying an unmodified ethylene/.alpha.-olefin copolymer resin (A1) or an unmodified ethylene/.alpha.-olefin copolymer elastomer (B1) with an unsaturated carboxylic acid or anhydride, ester, amide, imide or metallic salt derivative thereof and having a graft quantity of 0.01 to 5% by weight, each of said resin (A1) and said elastomer (B1) being a copolymer of ethylene and an .alpha.-olefin of 3 to 20 carbon atoms and having the following properties:(i) the density is in the range of 0.860 to 0.930 g/cm.sup.3, and(ii) the crystallinity, as measured by X-ray diffractometry, is not more than 60%;an unmodified ethylene/.alpha.-olefin copolymer resin (C1) and/or an unmodified ethylene/.alpha.-olefin copolymer elastomer (C2); anda tackifier (D), andwherein the adhesive polyethylene composition has the following properties:(a) the content of the tackifier (D) is in the range of 0.1 to 20% by weight based on 100% by weight of the whole composition;(b) the graft quantity of the unsaturated carboxylic acid or derivative thereof is in the range of 0.01 to 1.0% by weight based on 100% by weight of the whole composition;(c) the density is in the range of 0.880 to 0.920 g/cm.sup.3 ;(d) the crystallinity, as measured by X-ray diffractometry, is in the range of 15 to 50%; and(e) the melt flow rate, measured at 190.degree. C., load of 2.16 kg is in the range of 0.1 to 50 g/10 min.