Non-Isocyanate Polyurethane Systems: A Review

Conventional polyurethanes, though exhibit excellent properties, involve use of isocyanates which in turn utilize hazardous and toxic phosgene. These isocyanates are also considerably toxic and moisture sensitive. Growing global awareness of the need to protect our environment and continually strive to ensure the health and well-being of those in the industry and consumers create the demand for environment-friendly products. The cyclic carbonate-amine reaction which results in hydroxyurethanes has been extensively studied over the last few years. This chemistry is now attracting research interest due to its potential application in the preparations of "green," non-porous, moisture-insensitive isocyanate frees polyurethanes. The various application of NIPU includes in the field of coatings, composites, construction and biomedical etc.