Fructan-polycarboxylic acid

摘要

Fructan-polycarboxylic acids and salts thereof wherein at least 0.05 of every 3 hydroxymethyl(ene) groups of the fructan has been converted into a carboxyl group and at least 0.1 of every 3 hydroxyl groups has been converted into a carboxymethoxy (or other carboxyalkyl or carboxyacyl) group have an improved action as crystal growth-inhibiting, calcium-binding and/or -dispersing agents. The fructan-polycarboxylic acids can be prepared in that a fructan is oxidised and the oxidation product is then carboxymethylated, or is first carboxymethylated and then oxidised.