The present invention is related with a novel binder having high bindability and flowability. The binder of the present invention has a BET specific surface area of 80 to 400m2/g and is composed of carbonate group-containing magnesium hydroxide particles represented by the following formula (1). Mg(OH)2-x(CO3)0.5x‧ mH2O (1)In the above formula, x and m meet the following conditions.0.02 ≦ x ≦ 0.70 ≦ m ≦ 1Even when the binder of the present invention is prescribed with a disintegrating agent and a water-soluble diluent, it does not retard the disintegrating time of a tablet, can improve the hardness of the tablet and can be directly tableted.本發明為結合性及流動性高之新穎的結合劑。本發明之結合劑係BET法所得之比表面積為80~400m2/g,且由下式(1)所示之含有碳酸基之氫氧化鎂粒子所構成。Mg(OH)2-x(CO3)0.5x‧mH2O (1)其中,式中x及m滿足下述條件。0.02≦x≦0.70≦m≦1本發明之結合劑係即使與崩壞劑或水溶性賦形劑一起調配,仍不延遲錠劑之崩壞時間,且可提升錠劑硬度,並可直接進行打錠的結合劑。
