Water-soluble polymers and their use as auxiliaries for building materials

Claim 1

Water-soluble copolymers consisting of (1) 5 to 50 mol % of radicals of the formula I ##STR6## (2) 0 to 20 mol % of radicals of the formula II ##STR7## (3) 5 to 50 mol % of radicals of the formula III ##STR8## (4) 5 to 50 mol % of radicals of the formula IVa or IVb ##STR9## (5) 2 to 50 mol % of radicals of the formula V ##STR10## wherein, in the radicals I to V, R 1 denotes hydrogen or a methyl group, R 2 denotes an alkoxycarbonyl group with 1 to 4 C atoms in the alkoxy group, an alkanoyloxy group with 1 to 4 C atoms or a β-hydroxyalkoxycarbonyl with 2 or 3 atoms, R 3 denotes a methyl or an ethyl group, R 4 denotes hydrogen or a methyl group, R 5 and R 6 , the same or different, denoting hydrogen, a methyl or ethyl group or a common trimethylene or pentamethylene ring, R 7 denoting hydrogen or a methyl group, and X denotes an imidazole or carbazole radical in the radicals I to V it being necessary for the sum of (1) to (5) always to give 100 mol %.