Tie layer adhesive in multilayer packaging films

Multilayer films with a special structure have been used in food packaging. These films are designed to protect food for a long time by avoid permeating gases such as oxygen, carbon dioxide and water vapor. The gas barrier ability is resulted by combination polar and non-polar polymers. The poor adhesion between incompatible polymers would solve by using a particular type of adhesives: “tie layer”

Tie layer in multi-layer barrier film
Tie layer in multi-layer barrier film

Common polyolefin-based films should be combined with other polar polymers such as PET, PA and EVOH by co-extrusion to provide ideal multilayered structure containers. But main challenge in multilayer films is adhesion quality between layers. The film performance will be perfect when the incompatibility of the layers has been eliminated. Consequently, the new type of adhesives as adhesion promoters or tie layer resin are designed with bimodal functionality to provide compatibility to different layers. The functional groups in tie layer cause the chemical interaction (covalent or hydrogen bond) at polar substrate-adhesive interface. Also polymer backbone in tie layer can interact with non-polar resin melt.

Chemical interaction by tie layer
Chemical interaction by tie layer

Tie layer adhesive of Aria Polymer Pishgam Company

Aria Polymer company is manufacturer of tie layer adhesives for multilayer food packaging films based on your requirements. For more information on properties and applications, contact our sales expert. We will be delighted to provide your inquiries.