Polyolefin films having improved barrier properties

Details Polyolefin films having improved barrier properties Polyolefin films having improved barrier properties

C - Chemistry, Metallurgy

08

L

400/5180

C08L 23/02 (2006.01) C08J 5/18 (2006.01)

Patent

CA 1340116

The barrier properties of crystalline polyolefin film can be improved substantially by incorporating a precise amount of a partially incompatible wax into the polyolefin. When the polyolefin is polypropylene or polybutylene, the wax is preferably a paraffin wax. The precise amount of wax, which produces optimum improvement in barrier properties, lies in the range of about 3 to 10 percent based on the weight of the polyolefin. The range in which excellent results are obtained can be broadened by contacting the film with a cooling medium immediately after it is extruded. The film may be annealed to further improve the barrier properties.

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