| 摘要 |
An aqueous amphoteric polyurethane emulsion is prepared by reacting an isocyanate-terminated urethane prepolymer with an excess of a polyalkylene polyamine to form a polyurethane-urea-polyamine; reacting a portion of the free amino groups contained in the resulting product with a blocked polyisocyanate having one free isocyanate group; rendering the remaining amino groups contained in the resulting product amphoteric either (I) by reacting said amino groups with a compound selected from the group consisting of 1,3-propane sultone, 1,4-butane sultone, beta -propiolactone, gamma -butyrolactone, epsilon -caprolactone, delta -valerolactone and a monohalogenated sodium carboxylate having the formula X(CH2)nCOONa WHEREIN X is halogen and n is an integer of 1 and 2, in an amount such that the final polymer becomes emulsifiable, or (II) by reacting said amino groups with a compound selected from the group consisting of methyl acrylate, ethyl acrylate, methyl methacrylate, ethyl methacrylate and acrylonitrile, and then hydrolyzing the reaction product thus formed; and thereafter mixing the resulting polymer with water.
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