Heat sealable multiple layer barrier film

Details Heat sealable multiple layer barrier film Heat sealable multiple layer barrier film

B - Operations, Transporting

32

B

154/140, 220/2,

B32B 27/08 (2006.01) B65D 65/40 (2006.01)

Patent

CA 1336880

Multiple layer film comprising a first layer of vinylidene chloride copolymer having a first softening temperature. A second polymeric sealant layer has a second softening temperature no more than 20°C less than the first softening temperature. A third layer is between the first and second layers, the third layer having a third softening temperature greater than the first and second softening temperatures. A fourth layer has a fourth softening temperature greater than the first and second softening temperatures. The first layer is positioned between the third and fourth layers. All the layers of the film are adhered respectively to each other. The composition of the second layer preferably comprises a polypropylene polymer, or other higher softening temperature polymer composition. The composition for the third layer is preferably selected from among polyesters, polycarbonates, polyamides, polypropylenes, and polyethylenes. The composition for the fourth layer is preferably selected from among polyesters, polycarbonates, polyamides, and polypropylenes. The films of the invention are adapted for being used in the fabrication of closed packages.

573820

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