The incorporation of sulfur functionality into the backbone of polymeric systems has been known for many years as a means to provide various performance benefits such as improved adhesion and chemical resistance. One way by which sulfur is utilized in polymeric materials is through the use of polythiols as crosslinkers in thermoset systems. For instance, polythiols are known to be effective hardening agents for epoxy resins. Polythiols are also known for use with isocyanates in urethane polymers to produce polythiourethanes, although perhaps not as widely recognized. Recently interest has increased in environmentally friendly products and materials derived from renewable resources. Particular attention has been brought to raw materials derived from natural triglyceride oils, such as soybean oil. These polyolefinic materials provide a convenient route to polythiols when combined with Chevron Phillips Specialty Chemical's hydrogen sulfide (H2S) handling and process technologies. Novel polythiols derived from soybean oil have been developed by Chevron Phillips Specialty Chemicals. The synthesis, structure, and characteristics of these polythiols will be discussed.