Patent ID: 7495048

Claim:
A sealing layer composition consisting essentially of: from 75 to 99 wt %, based upon the weight of the sealing layer composition, of an ethylene-unsaturated ester copolymer having a melt index of 35 g/10 min or less, and from 5 to 20 wt % of a high softening point resin selected from the group consisting of aliphatic hydrocarbon resins, hydrogenated aliphatic hydrocarbon resins, aliphatic/aromatic hydrocarbon resins, hydrogenated aliphatic/aromatic hydrocarbon resins, cycloaliphatic hydrocarbon resins, hydrogenated cycloaliphatic resins, cycloaliphatic/aromatic hydrocarbon resins, hydrogenated cycloaliphatic/aromatic hydrocarbon resins, aromatic hydrocarbon resins, hydrogenated aromatic hydrocarbon resins, grafted resins, and combinations thereof, the resin having a softening point of 110 to 180° C., wherein during a heat sealing process the maximum hot tack of the sealing layer composition is greater than the maximum hot tack of the ethylene-unsaturated ester copolymer alone and the sealing layer composition sealing temperature is at least 10° C. below the sealing temperature of the ethylene-unsaturated ester copolymer alone for a predetermined hot tack value.