| 摘要 |
A powdered laundry detergent is provided with (a) a powder laundry detergent base that includes an inorganic carrier and a surfactant and (b) post-added acidulant and discrete whitening agent particles to provide a detergent having improved cool water solubility with bulk color deterioration caused by whitening agents being minimized. The detergent includes from about 5% to about 80% of an inorganic carrier, from about 1% to about 90% of a detergent surfactant, from about 0.1% up to about 15% of an acidulant and from about 0.1% up to about 30% of the discrete whitening agent particles. The acidulant is selected from the group of acids that in an acid form are soluble in water in an amount not greater than about 8%, preferably not greater than about 0.7% by weight at 25 DEG C. and in a salt form are soluble in water at least in an amount of about 15% by weight at 25 DEG C. The whitening agent particles include a whitening agent and a surfactant. The whitening agent surfactant can consist of those anionics, nonionics, zwitterionics, ampholytics, cationics, and mixtures thereof that are solids in a temperature range of from about 32 DEG F. (0 DEG C.) to about 180 DEG F. (82 DEG C.). In a more preferred form, the whitening agent particles consist of a whitening agent, a surfactant, preferably an anionic surfactant, and water. |
