Alternative Green Polyurethane™ Biodegradable coating for fiber products to improve oil and grease resistance. The First Hybrid Polyurethane Manufactured Without Toxic Isocyanates NTI has developed Green Polyurethane - an epoxy-urethane technology that allows epoxides to be cured with urethane-amine catalysts and developed into many applications from coatings, composites and compounds to foam and adhesives.