From Wallaces Farmer — Iowa State University research engineers have good news for soybean growers: a soy oil polymer for asphalt paving. After nine years of development, the ISU research team is closing in on commercializing a high-oleic soy oil polymer that can replace petroleum-based polymers in asphalt paving. The bio-based binding agent is an economical, efficient and sustainable option for asphalt pavers with the potential to open a new — and  large — market for soybean growers.