Patent ID: 7115548
Filing Date: 2006-10-03
Classification: C11D

Abstract:
1. A high-density detergent composition comprising 10 to 60% by weight of a surfactant composition having a weight ratio of an anionic surfactant to a nonionic surfactant of 4:10 or more and 10:0 or less, wherein said surfactant composition comprises an alkali metal silicate and also comprises 15% or less by weight of sodium carbonate, wherein the high-density detergent composition has a bulk density of from 600 to 1200 g/L, and has a total summation of a product of a mass base frequency Wi and a dissolving rate Vi which satisfies the following formula (A): of each group of classified granules obtained by classifying detergent granules by using a classifier, wherein a mass base frequency Wi of the classified granules having a size of less than 125 μm is 0.1 or less and a mass base frequency Wi of the classified granules having a size of more than 710 μm and less than 1000 μm is 0.1 or less and each mass base frequency Wi satisfies the relationship such that the mass base frequency of [classified granules having a particle size of 1000 μm or more]≦[classified granules having a particle size of 710 μm or more and less than 1000 μm]≦[classified granules having a particle size of 500 μm or more and less than 710 μm] when the granules are classified with a classifier that comprises a series of sieves having sieve-openings respectively of 2000 μm, 1410 μm, 1000 μm, 710 μm, 500 μm, 355 μm, 250 μm, 180 μm, and 125 μm, and a receiver, wherein the mass base frequency Wi is obtained by dividing the weight of the classified granules on each sieve or on the receiver by an entire weight of the detergent composition, and wherein the dissolving rate Vi is determined under the following measurement conditions: supplying 1.000 g±0.010 g of a sample to 1.00 L±0.03 L of water at 5° C.±0.5° C. having a water hardness of 4° DH, stirring in a 1 L beaker of which inner diameter is 105 mm, with a cylindrical stirring rod of which length is 35 mm and diameter is 8 mm, at a rotational speed of 800 rpm for 120 seconds, and thereafter filtering insoluble remnants by a standard sieve having a sieve-opening of 300 μm as defined according to JIS Z 8801, wherein the dissolving rate Vi of the classified granules is calculated by the following formula (a), i being each group of the classified granules: wherein Si is a weight (g) of each group of the classified granules supplied; and Ti is a dry weight (g) of the insoluble remnants of each group of the classified granules remaining on the sieve after filtration.