Carboxyalkylcellulose, in particular carboxy-C1-6-alkylcellulose, like, for example, carboxymethylcellulose, carboxyethylcellulose, carboxypropylcellulose, or carboxybutylcellulose and quite particularly preferably carboxymethylcellulose or carboxyethylcellulose are used as cellulose esters.According to another form, the composition comprises at least two different hydrocolloids.