4) WATER REPELLENT EFFECTS ON N, N-ETHYLENE STEARYL URETHANE (1) Water-repellent treatments using N,N-ethylene stearyl urethane were studied. Viscose rayon fabrics treated with dispersion of N,N-ethylene stearyl urethane adding Al(N03)3 or Zn(BF4)2 or Cd (BF4)2 as catalyst, showed better water-repellency. And the fabrics had less after-change of their waterrepellency and showed better resistance to wash than the fabric treated only by a dispersion without catalyst. But the water-repellency of

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... e fabrics was not yet sufficient for practical use. (Received August I2, 1960) (5) WATER-REPELLENT EFFECTS OF N,N-ETHYLENE STEARYL URETHANE (II) Viscose rayon fabrics treated with a dispersed solution of N, N-ethylene stearyl urethane and urea-melamine formaldehyde resin adding Zn (BF4)2 or Cd (BF4)2 as catalyst, showed very good water repellency. And the treated fabrics had no after-change in the water-repellent effect and had good resistance to washing. The treated fabrics showed a small decrease of flex abrasion, tensile strength and tear strength, but it was found that the defect of the decreasing due to using Zn(BF4)2 as catalyst were not so much for practical use.