Miscellaneous Isocyanate-Based Materials

Because of their great versatility there continues to be a steady stream of developments of polymers made by reaction of isocyanates. In addition to the materials discussed in this chapter there are, to name but three, the polyureas, the polyoxazolidinones and polybenzoxazinediones. 

There is also growing interest in multi-phase systems in which hard phase materials are dispersed in softer polyether diols. Such hard phase materials include polyureas, rigid polyurethanes and urea melamine formaldehyde condensates. Some of these materials yield high-resilience foams with load deflection characteristics claimed to be more satisfactory for cushioning as well as in some cases improving heat resistance and flame retardancy. 

Aqueous dispersions of polyurethanes have also become available which may be used instead of solutions in organic solvents for such applications as leather treatment, adhesives and surface coatings. 

The polycarbamylsulphonates are water-soluble reactive bisulphite adducts of polyisocyanates and are being investigated as possible materials to render woollen fabrics crease-resistant. 

SAUNDERS, j. H., and FRISCH, K. G., Polyurethams—Chemistry and Technology Pt 1-Interscience, New York (1962) 

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