The objective of the paper is three-fold, covering the use of maleated polyolefins as chemical coupling agents, compatibilizers, and impact modifiers. Introduction of a new chemical coupling agent for glass reinforced polypropylene details its improved properties versus current systems. Discussion of impact modifiers includes three developmental impact modifiers that combine higher melt now properties and good room temperature notched Izod properties. The third area details the property improvements obtained in nylon/polypropylene blends through compatibilization with a maleated polyolefin.