| 摘要 |
<p>A detergent builder comprising a maleic acid copolymer produced by copolymerizing a maleic acid (salt) with comonomers by using both hydrogen peroxide and a persulfate salt as the polymerization initiator and having a weight-average molecular weight of 5000 to 100000 and a molar ratio of the maleic acid (salt) monomer units to all the monomer units of 0.1 to 0.9. The builder is suitably usable for detergent compositions, because it has a high calcium ion stability constant and can well prevent iron particle precipitation. It is produced by granulating a powder containing the maleic acid copolymer as a water-soluble polycarboxylic acid (salt) polymer by using a surfactant under stirring. As the use of the builder makes it possible to prepare a detergent composition having improved angle of repose, fluidity and moisture absorption resistance and containing the builder having the above characteristics by dry blending, a detergent composition having excellent characteristics can be produced at a low cost.</p> |
