DETERGENT BUILDERS AND PROCESS FOR PREPARATION THEREOF

摘要

A detergent builder consisting essentially of an inorganic fine powder composed mainly of an alkali metal aluminosilicate having an X-ray diffraction pattern substantially same as that of zeolite of the type A and having a degree of crystallization in the range of from 35 to 75%, wherein said inorganic fine powder has a primary particle size smaller than 1 .mu. and a secondary particle size smaller than 4 .mu., said inorganic fine powder has a buffer capacity (S) of at least 132 m?/100 g. of solids, said buffer capacity being expressed by an amount of hydrochloric acid necessary for lowering the pH of a 1% aqueous dispersion of said inorganic fine powder from 9.0 to 6.75 when said dispersion is titrated with 0.4 N hydrochloric acid at a rate of 20 to 50 m?/hr., and wherein said inorganic fine powder has a calcium ion binding property (C.I,) of at least 70 mg./g. as expressed as CaO.