| 摘要 |
<p>A novel blend, film, and patch bag combination of: (a) a bag having inside and outside surfaces comprising a flexible, thermoplastic, biaxially stretched, heat shrinkable film having at least one blend layer having at least three copolymers comprising: 45 to 85 weight percent of a first polymer (having a melting point of 55 to 98 DEG C) comprising a copolymer of ethylene and hexene-1 or octene-1; 5 to 35 weight % of a second polymer (having a melting point of from 115 to 128 DEG C) comprising a copolymer of ethylene and at least one alpha -olefin; and 10 to 50 weight percent of a third polymer (having a melting point of from 60 to 110 DEG C) comprising an unmodified or anhydride-modified copolymer of ethylene and a vinyl ester, acrylic acid, methacrylic acid, or an alkyl acrylate; where the first and second polymers above have a combined weight percentage≥50 weight % based upon their total weight; and the bag film has a total energy absorption≥0.70 Joule and a shrinkage value at 90 DEG C≥50% in at least one of the machine and transverse directions; and (b) a patch film attached to at least one surface of the bag and covering at least 25% of the bag's surface where this patch film comprises a flexible, thermoplastic film comprising a blend of≥2 polymers comprising: 5 to 20 weight % of (i) an ionomer polymer e.g. an ethylene-methacrylate acid copolymer whose acid groups have been neutralized partly or completely to forma salt, preferably a zinc or sodium salt; 5 to 95 weight percent of (ii) a copolymer of ethylene and at least one C6 to C8 alpha -olefin, (melting point of from 55 to 95 DEG C and Mw/Mn of 1.5 to 3.5); 0 to 90 weight percent of (iii) a copolymer of ethylene and at least one C4 to C8 alpha -olefin (melting point of 100 to 125 DEG C); and 0 to 90 weight percent of (iv) a copolymer of propylene and ethylene or butene-1 (melting point of 105 to 145 DEG C); 0 to 90 weight percent of (v) a copolymer of ethylene and hexene-1, octene-1 and/or decene-1, (melting point of 125 to 135 DEG C); and polymers (ii), (iii), (iv), and (v) have a combined weight % of≥80 weight % based upon the total weight of polymers (i), (ii), (iii), (iv), and (v); and the patch film has a total energy absorption of≥1.2 Joule, and process for making same. <IMAGE></p> |
