Stepan Company was founded in 1932 by Alfred C. Stepan Jr. Headquartered in Northfield, Illinois, Stepan manufactures basic and intermediate chemicals, including surfactants, specialty products, germicidal and fabric softening quaternaries, phthalic anhydride (P.A.), polyurethane polyols and special ingredients for the food, supplement and pharmaceutical markets.
Polyester resins and polyols.