Useful composite matrix materials have been prepared from a series of soybean oils. Their properties are primarily affected by crosslink density. The utility of these resins was demonstrated on two series of laminates prepared from two types of polyols and several types of reinforcements: glass fabric, carbon fiber, polyester, and cotton and jute fabrics. Polyurethane matrix resins are a viable alternative to epoxy and polyester matrix resins and they are already being used commercially in selected farm combine and automotive applications.