Reactive polyolefins (POR)
They are used, like PUR, in applications where the final product requirements include high temperature resistance. Their main feature is good adhesion to non-porous materials such as polypropylene (PP) without the need for pre-treatment.
Although adhesives with a polyamide (PA) base are not strictly reactive adhesives, the difficulty in applying them, their high levels of moisture absorption and their degradation with oxygen from the atmosphere require similar application systems to those used for reactive adhesives. These are considered to be high-performance adhesives for harsh atmospheres and high temperatures, normally applied at more than 200°C, due to their high re-softening point, but they can become degraded and burn during the process. In melted state they can be partly degraded by the oxygen in the atmosphere. They have a wide range of working temperatures, generally displaying adequate adhesion from -40 ºC to 70 °C and, in some compositions, allowing use at 185 °C if they do not have to bear loads.