It is preferred that at least one binder of the binder component be selected from enteric polymers such as, but not limited to, suitable cellulose derivatives, e.g. cellulose acetate phthalates, cellulose acetate succinates, cellulose acetate trimellitates, carboxyalkyl(alkyl)celluloses and hydroxyalkyl(alkyl) cellulose phthalates; suitable polyvinyl-based polymers and copolymers, e.g. polyvinylac