The coarsely disperse, redispersible polyurethane (urea) dispersions which are prepared according to the invention may be obtained, for example, by dissolving or dispersing the polyisocyanate polyaddition product (a) in a solvent such as acetone or methyl ethyl ketone, ethyl acetate, methylene chloride, chloroform or tetrahydrofuran, adding the polyurethane (b) in the form of a solid or solution b