Water solubility or canning the capsule piece of the water-swelling polymer material make in gastric fluid tolerance being the coating flux in order in the water dispersion liquid or the form of the aqueous solution, it possesses gastric fluid tolerance at least it possesses the first (meta) acrylate copolymer and gastric fluid tolerance of 1 where genera, or water insolubility is obtained the aid which from the further (meta) acrylate copolymer of 1 genera at least the polymer blend, and the viscosity of the dispersion liquid where it makes dry produces effect on elasticity of the polymer film which it contains, in the aforementioned coating flux, the aforementioned dispersion liquid or the solid-comprising component of the aforementioned solution 25 mass % super withIt is, the viscosity is 150 - 1500mPas, here it is produced from the aforementioned dispersion liquid or aforementioned solution and as for the film which is made to dry, the break dot extension at least is 200%, the capsule which is formed from two capsule pieces canning with dipping modulo by the aforementioned dispersion liquid or the aforementioned solution, with 0.1N HCl and pH1.2 does not dissolve 2 hours later, but it continues and in the buffer of pH6.8 it features that it dissolves completely under 30 minutes, the aforementioned coating flux.水性分散液又は水溶液の形での、水溶性又は水膨潤性ポリマー材料製のカプセル片を胃液耐性に被覆するための被覆剤であって、胃液耐性を有する少なくとも1種の第一の(メタ)アクリレートコポリマーと、胃液耐性を有するか、又は水不溶性の少なくとも1種のさらなる(メタ)アクリレートコポリマーとから得られるポリマー混合物、並びに分散液の粘度と乾燥させたポリマー膜の弾性に影響を与える助剤を含有する、前記被覆剤において、前記分散液又は前記溶液の固体含分が25質量%超であり、その粘度が150~1500mPasであり、ここで前記分散液又は前記溶液から製造されて乾燥させた膜は、破断点伸びが少なくとも200%であり、前記分散液又は前記溶液により浸漬法で被覆された2つのカプセル片から構成されたカプセルが、0.1N HCl、pH1.2で2時間後には溶解しないが、引き続きpH6.8の緩衝液では30分未満で完全に溶解することを特徴とする、前記被覆剤。
