Polyolefin films having improved barrier properties

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

1990-07-10

1992-10-13

Lesmes, George F.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524489, 428348, 4284761, 428484, 428523, C08K 501, C08L 9106

Patent

active

051551608

ABSTRACT:
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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