Preparing comb polymers by esterifying at least one polycarboxylic acid or its salt with at least one monohydroxy polyether, comprises (a) providing a reaction mixture containing at least one polycarboxylic acid, (b) heating the reaction mixture to at least 80[deg] C, preferably at least 100[deg] C, (c) adding a base, and (d) esterifying at a reaction temperature of at least 80[deg] C, preferably at least 100[deg] C, to obtain the comb polymer. The reaction mixture in step (a) and/or (b) is added with at least one monohydroxy polyether. Independent claims are also included for: (1) a comb polymer containing composition obtainable by the above method; (2) a hydraulically setting cement composition comprising at least one above comb polymer containing composition, and at least one hydraulically setting binder; and (3) a molding obtainable by setting and hardening of the above cement composition.
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