POLYBOND™ polypropylene-based coupling agents are coupling agents, compatibilizers, and adhesion promoters for glass, mica, talc, wood, and natural fiber reinforced polypropylene, giving enhanced physical and thermal properties. Comprised of maleic anhydride–modified polypropylene (PP), POLYBOND™ polypropylene-based coupling agents are ideal for improving interfacial adhesion between PP and polar fillers by increasing tensile strength and impact resistance. Applications that can benefit from SI Group polypropylene coupling agents include automotive interior trims, structural parts, under-the-hood components, reinforced pipes, panels, furniture, halogen-free flame retardant wire and cable compounds, and upcycling of post-consumer and post-industrial polyolefin waste.