Multilayered polymer films and process for the preparation thereof
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United States of America Patent
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Dec 25, 2001
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N/A
app pub date -
Jan 29, 1996
filing date -
Feb 28, 1994
priority date (Note) -
Expired
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Abstract
The present invention concerns a multilayered polymer film structure, which comprises at least one first layer (1) containing a thermoplastic polymer and at least one second layer (2), arranged adjacent to said first layer, containing a liquid crystalline polymer. According to the invention, the second layer (2) consists essentially of a compounded polymer blend formed by the liquid crystalline polymer and a thermoplastic polymer, the liquid crystalline polymer of the second layer forms a continuous phase, and the first and the second layers (1, 2) contain the same thermoplastic polymer. The oxygen transmission rate of the second layer is less than about 150 cm.sup.3 /(m.sup.2.multidot.d.multidot.bar), determined according to the standard ASTM D 3985-81, and the water vapour transmission rate of the integral film structure is less than 10 g/(m.sup.2.multidot.24.multidot.h) at RH 80% 23.degree. C., determined according to ASTM F 1249-90. The present structure can be used as a barrier layer in packages.
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