Generally speaking, conventional lidding films either: 1. provide reliable seal integrity but are often difficult to open; or 2. are easily opened but provide less reliable seal integrity. The present invention eliminates this trade-off; that is, the lidding films of the present invention are easily opened by consumers and have reliable heat seals, even at very low temperatures.
U.S. Pat. No. 4,375,494 to Stokes discloses multilayer films having a semi-crystalline polyester support layer and an amorphous polyester heat seal layer. The heat seal layer further comprises a finely divided particulate additive.