| 摘要 |
PURPOSE: A sparingly soluble builder based on an alkali silicate is provided, which exhibits high water-softening properties and is highly effective as a builder itself. CONSTITUTION: Hardly-soluble alkali silicates represented by formula(I) (xM12O· ySiO2) contain foliated alkali silicate represented by formula(II) (aM12O·bMllO·cX2O 3·dZ2 O5·eSiO2·fH2O) in finely-divided form in non-foliated alkali silicate surroundings (III), in which the molar ratio of silica to alkali metal oxide is (1.9-500):1. Hardly-soluble alkali silicates (I) contain foliated alkali silicate (II) in finely-divided form in non-foliated alkali silicate surroundings of formula xMI2O·ySiO2 (III), wherein MI is alkali metal; y/z is (1.9-500):1.
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