Kao Corporation

Hideichi Nitta

Hiroyuki Yamashita

Kenji Tanaka

Shu Yamaguchi

Teruo Kubota

Hitoshi Takaya

Yoshinobu Imaizumi

Kouji Toyoda

Jun Saito

Toshiharu Noguchi

Kyoko Okada

Shuji Takana

Kimihiro Mizusawa

Hiroki Yamaboshi

Jun Kozuka

Takashi Nakayama

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

A method for producing detergent granules, includes the step of dry-neutralizing a liquid acid precursor of a non-soap, anionic surfactant with a water-soluble, solid, alkali inorganic substance. In this method, a dry-neutralizing step is carried out in the presence of 0.1 to 1.0 mol of an inorganic acid per mol of the liquid acid precursor of a non-soap, anionic surfactant. The above detergent granules have the features of extremely low tackiness of the granules and containing larger number of micropores. By using the detergent granules, a high-bulk density detergent composition having a small particle size can be obtained at high yields.

Process for preparing detergent compositions having high bulk density

The present invention relates to a process for preparing particles for supporting a surfactant, comprising a step of giving a defect to a coating film containing a water-soluble component, wherein the coating film is formed on surfaces of raw material particles; and a process for preparing detergent particles comprising a step of mixing a surfactant composition and the particles for supporting a surfactant obtained by the above process, under conditions that the surfactant composition shows a liquid state. By using the process of the present invention, there can be obtained particles for supporting a surfactant, in which the supporting ability of the particles is improved, without lowering the detergency. In addition, by using the particles for supporting a surfactant, there can be obtained detergent particles having excellent detergency.

Process for producing granules for supporting surfactant

A mixing method and apparatus in which, a gas for conditioning the physical properties o the material being mixed is ejected forwardly of the direction of rotation of a stirring member from within the material being mixed, when stirring the material to be mixed with the stirring member which rotates around an axis inside a vessel.

Mixing device

A mixing apparatus comprising a stirring member (,) and a flow direction-changing member (,), which are provided so as to rotate together with a rotating shaft (,) disposed to be drivable in a rotating manner around an axis inside a vessel (,) for containing a material to be mixed, and a pulverizing member (,) provided on the inner circumference (,&prime;) of the vessel (,) facing the outer circumference of the rotating shaft (,) to be drivable in a rotating manner. The stirring member (,) is arranged by leaving a space relative to the outer circumference of the rotating shaft (,) in the radial direction of rotation, and has a stirring surface, which causes the material being mixed to flow toward the outer circumference of the rotating shaft (,). The flow direction-changing member (,) is provided by leaving a space relative to the inner circumference (,&prime;) of the vessel (,) in the radial direction of rotation between the stirring surface and the outer circumference of the rotating shaft (,), and has a changing surface (,&prime;), which changes the direction of flow of the material being mixed from a direction toward the outer circumference of the rotating shaft (,) to a direction toward the inner circumference (,&prime;) of the vessel (,).

Mixer

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Wakayama, Japan

Hideichi Nitta