Borealis A/s

Optatech Corporation

Seppo Kuusela

Erkki Laiho

Tapani Penttinen

Markku Sainio

Esa Suokas

Marja Ora

Matti Salste

Riitta Koskiniemi

Mika H&auml;rk&ouml;nen

Elina Koski

The present invention concerns a multilayered polymer film structure, which comprises at least one first layer (,) containing a thermoplastic polymer and at least one second layer (,), arranged adjacent to said first layer, containing a liquid crystalline polymer. According to the invention, the second layer (,) 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 (,) contain the same thermoplastic polymer. The oxygen transmission rate of the second layer is less than about 150 cm,/(m,&middot;d&middot;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,&middot;24&middot;h) at RH 80% 23&deg; C., determined according to ASTM F 1249-90. The present structure can be used as a barrier layer in packages.

Multilayered polymer films and process for the preparation thereof

Polymeric material and its use in multilayer products

Growing community of inventors

Porvoo, Finland

Seppo Kuusela