1. For a recent review see, e.g., W.-Y. Wen, Aqueous Solutions of Symmetrical Tetraalkylammonium Salts, inWater and Aqueous Solutions, R.A. Horne, ed., John Wiley & Sons, Inc., New York, 1972), Chap. 15, pp. 613?661.
2. J.H. Saunders and K.C. Frisch,Polyurethanes: Chemistry and Technology, Part I. (Interscience, New York, 1962).
3. A. Farkas, G.A. Mills, W.E. Erner, and J.B. Maerker,J. Chem. Eng. Data 4, 334 (1959).
4. P. Paoletti, J.H. Stern, and A. Vacca,J. Phys. Chem. 69, 3759 (1965).
5. J.W. Larson, G.L. Bertrand, and L.G. Hepler,J. Chem. Eng. Data 11, 595 (1966).