Exxonmobil Chemical Patents Inc.

Marc D Tierens

Mario Bastiaens

Stefan B Ohlsson

Etienne R H Lernoux

Achiel J M Van Loon

Achiel Jos Van Loon

Michael Jan Vinck

Dirk J Permentier

Dirk G F Van Der Sanden

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

A method of improving hot tack and/or seal strength in a multi-layer film by selecting a first PE comprising at least one of mPE, LDPE or LLDPE to form a first layer and selecting a blend comprising a mPE and a PP to form an outer layer; and coextruding the first PE and the blend to form the multi-layer film comprising the first layer and the outer layer; wherein the inner layer comprises at least one component having a final melting point at least about 15&#xb0; C. higher than a final melting point of at least one component of the first layer, wherein the multi-layer film has a maximum hot tack at least about 25% greater than a similar multi-layer film with-weight % of the PP in the inner layer.

Multi-layer films with improved properties

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Metse, Belgium

Marc D Tierens