Kao Corporation

Kimihiro Mizusawa

Shu Yamaguchi

Hiroyuki Yamashita

Kazuo Oki

Hiroji Hosokawa

Toshiharu Noguchi

Hideichi Nitta

Kyoko Okada

Jun Kozuka

A high-density detergent composition comprises 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 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 of each group of classified granules obtained by classifying detergent granules by using a classifier, which satisfies the following formula: &#x3a3;(Wi&#xb7;Vi)&#x2267;95(%), and wherein a mass base frequency of the classified granules having a size of less than 125 &#x3bc;m is 0.1 or less, wherein the classifier comprises sieves each having a sieve-opening 2000 &#x3bc;m, 1410 &#x3bc;m, 1000 &#x3bc;m, 710 &#x3bc;m, 500 &#x3bc;m, 355 &#x3bc;m, 250 &#x3bc;m, 180 &#x3bc;m, and 125 &#x3bc;m, and a receiver.

High-density detergent composition

Base particles for supporting a surfactant, obtainable by a step of spray-drying a slurry comprising (A) a zeolite having an average aggregate particle diameter of 15 &#x3bc;m or less and a variation coefficient of a distribution of an aggregate particle diameter of 29% or less, (B) a water-soluble polymer; (C) a water-soluble salt, and (D) a surfactant in an amount of 5% by weight or less of the slurry; detergent particles comprising the base particles; and a zeolite for a laundry detergent, wherein the zeolite has an average aggregate particle diameter of 15 &#x3bc;m or less and a variation coefficient of a distribution of an aggregate particle diameter of 29% or less; and a process for preparing base particles for supporting a surfactant, comprising a step of spray-drying a slurry comprising a zeolite (A) having an average aggregate particle diameter of 15 &#x3bc;m or less and a variation coefficient of a distribution of an aggregate particle diameter of 29% or less, a water-soluble polymer (B), a water-soluble salt (C), and optionally a surfactant (D) so as to give base particles comprising 1 to 90% by weight of the zeolite (A), 2 to 25% by weight of the water-soluble polymer (B), 5 to 75% by weight of the water-soluble salt (C), and optionally 0 to 5% by weight of the surfactant (D).

Base particles and detergent particles

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Wakayama, Japan

Kimihiro Mizusawa