Coextruded Adhesives

Kraton® polymers can be formulated with resins, plasticizers and stabilizers to give high viscosity adhesive compounds for manufacture of films by coextrusion. Tack, adhesion and melt flow of these compounds can be tailored for specific processing and performance needs.

Features and Benefits

Kraton polymers are available covering a wide range of viscosity and mechanical properties. These polymers can be formulated with resins, plasticizers and stabilizers to give adhesive compounds covering a broad range of processing and performance properties. The following are the main benefits of Kraton polymers in compounds for coextrusion.

• Melt flow of the compound can be matched to other polymers being coextruded
• Compounds are free-flowing pellets which feed well into extruders
• Compounds can be made that range from non-tacky to semi-PSA
• Films have very low gel contents
• Kraton G compounds adhere well to polyolefins
• Kraton FG compounds adhere well to engineering thermoplastics

Products

Protective films: Two layer protective films can be made by coextrusion of a Kraton G compound with a polyolefin. Adhesion of the adhesive layer can be fixed to control the peel strength needed to remove the film from a protected substrate.

Tie-Layer: Kraton adhesive compounds can be used as tie layers between two dissimilar thermoplastics in a three layer coextrusion process. Kraton D and G compounds can be used to adhere dissimilar hydrocarbon polymers, such as polypropylene to polystyrene. Kraton FG compounds can be used to adhere a hydrocarbon polymer to an engineering thermoplastic, such as polypropylene to polyester.