Patent ID: 6110570
Filing Date: 2000-08-29
Classification: B32B,Y10S,Y10T

Abstract:
A multilayer heat-shrinkable film, comprising:(A) a heat-sealable layer comprising single-site or metallocene catalyzed ethylene-alpha-olefin copolymer;(B) a first inner layer having a composition comprising at least one member selected from the group consisting of ethylene/vinyl acetate copolymer containing from 4 to 28 weight percent vinyl acetate units and having a melt index less than 1.0 g/10 minutes, and ethylene/alkyl acrylate copolymer containing from 9 to 28 weight percent alkyl acrylate units and having a melt index less than 1.0 g/10 minutes;(C) a second inner layer in fact-to-face contact with the first inner layer, wherein the second inner layer has a composition comprising at least one member selected from the group consisting of ethylene/acrylic acid copolymer in free acid form, ethylene/methacrylic acid copolymer in free acid form, and ethylene/alkyl acrylate copolymer; and(D) a fourth layer having a composition comprising at least one member selected from the group consisting of ethylene/vinyl acetate copolymer containing from 4 to 28 weight percent vinyl acetate units and having a melt index less than 1.0 g/10 minutes, and ethylene/alkyl acrylate copolymer containing from 9 to 28 weight percent alkyl acrylate units and having a melt index less than 1.0 g/10 minutes, wherein the fourth layer is in face-to-face contact with the second inner layer and is not in contact with the first inner layer;wherein the composition of the second inner layer is different from the composition of the first inner layer and the fourth layer, and wherein a weight ratio of the first inner layer to the second inner layer, and the fourth layer to the second inner layer, are each from 1:8 to 8:1.