| abstract |
(57) [Abstract] [Objective] A polyurethane aqueous dispersion which has been hydrophilically modified with a compound having a carboxylic acid group and exhibits satisfactory water resistance, in particular, a slight water swellability. Composition: essentially a) an organic polyisocyanate, b) The dihydroxy compound and tetracarboxylic dianhydride 2: A dihydroxyl compound obtained by reacting in a molar ratio of 1 to 1.05: 1, c) optionally a polyhydroxyl compound having no ionic groups or no groups convertible to ionic groups, d) Optionally at least one group reactive towards isocyanate and at least one group convertible to anionic or anionic groups. A compound having one group, e) optionally comprising a polyurethane composed of a compound having at least two groups reactive towards isocyanates, which has no ionic groups or groups convertible to ionic groups Aqueous dispersion. |