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Abstract

A water-soluble polyurethane obtained from water-soluble polyalkylene glycol, polydiisocyanate, and comb-shaped hydrophobic diol represented by the following general formula: ##STR1## wherein R.sup.1 is a hydrocarbon group of 1 to 20 carbon atoms; each of R.sup.2 and R.sup.3 is a hydrocarbon group or halogenated hydrocarbon group of 4 to 21 carbon atoms; each of X, X' and X' is an alkylene group of 2 to 10 carbon atoms; the hydrogen atoms of the above alkylene group may be substituted with an alkyl group, chlorine or an alkyl chloride group; each of Z and Z' is oxygen, sulfur or a CH.sub.2 group; R.sup.4 is an alkylene group of 2 to 10 carbon atoms in all; k is an integer of 0 to 15; n is an integer of 0 to 15 when Z is oxygen and is 0 when Z is sulfur or a CH.sub.2 group; n' is an integer of 0 to 15 when Z' is oxygen and is 0 when Z' is sulfur or a CH.sub.2 group. The water-soluble polyurethane is used as, for example, an extruding auxiliary for use in cement-based materials, a mortar thickening agent, a thickening agent for underwater concrete, a ceramics forming binder and a moisturizer for hair cosmetics, all of which are characterized by low tackiness and high shape retention.

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