PP adhesive resin

PP adhesive resin is a critical bonding layer material in multilayer co-extruded films. It is primarily used to address the issue of insufficient adhesion between polypropylene (PP) and other resin layers, such as nylon (PA), EVOH, and PE, thereby achieving a strong interlayer bond. In co-extruded structures, it functions as a tie layer, forming chemical bonds and physical entanglements with the non-polar PP substrate through its polar groups, thereby significantly enhancing interlayer peel strength and preventing delamination.

Its primary applications include: high-barrier co-extruded films, retort films, vacuum packaging films, oil-resistant food packaging films, and multi-layer CPP composite films. Particularly in PA/PP and EVOH/PP structures, the PP bonding resin ensures stable adhesion under high-temperature retorting, freezing, and oil-resistant conditions, preventing delamination and whitening, while maintaining the film’s transparency and heat-sealing performance.

In terms of processing, it is suitable for blown film and cast co-extrusion processes. It is primarily added via direct co-extrusion or functional masterbatches, with a typical usage rate of 100% in the adhesive layer and a layer thickness of 5–15 μm. It is one of the core materials for achieving high-performance flexible packaging films.