Exxonmobil Chemical Patents Inc.

Mario Bastiaens

Marc D Tierens

Stefan B Ohlsson

Achiel J M Van Loon

Etienne R H Lernoux

Michael Jan Vinck

Dirk G F Van Der Sanden

Anne-Marie Joly

Petra DeWael

Marc Tierens

Stefan Bertil Ohlsson

Disclosed are multilayer films which can provide desired film performance and balanced overall performance suited for various applications.

Multilayer films and methods of making the same

The invention relates to a blown film coextrusion process. The process involves extruding core contact layers through a die exit at a specified speed and cooling, orienting and crystallizing the multi-layer film formed at a specified deformation rate to form a the frost line is a specified distance from the die exit by withdrawing film at a take up speed. The core and core contact layers are of a film forming polymer composition comprising at least 90 wt % of ethylene based polymer. The ethylene based polymer of the core layer has an average density of ethylene based polymers equal to or higher than that of ethylene based polymer of the core contact layers. The invention specifically concerns the feature that the core layer composition contains a portion of and the composition of the core contact layers contains a portion of a linear polyethylene so as to make the core layer more resistant to deformation than the skin layers.

Coextrusion processes for making multilayer films and films made thereby

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Haacht, Belgium

Mario Bastiaens