Patent ID: 6376453
Filing Date: 2002-04-23
Classification: C11D

Abstract:
Detergent particles having an average particle size of from 150 to 500 &mgr;m and a bulk density of 500 g/liter or more,wherein the detergent particles comprise a detergent particle, which releases a bubble from an inner portion of the detergent particle in a process of dissolving the detergent particle in water, the bubble having a size of one-tenth or more of a particle size of the detergent particle, and wherein the detergent particles have a dissolution rate of 90% or more, under conditions where the detergent particles are supplied in water at 5Â° C.; stirred for 60 seconds under the stirring conditions that 1 g of the detergent particles is supplied to a one-liter beaker having an inner diameter of 105 mm which is charged with one-liter of hard water having 71.2 mg CaCO3/liter, wherein a molar ratio of Ca/Mg is 7/3, and stirred with a stirring bar of 35 mm in length and 8 mm in diameter at a rotational speed of 800 rpm; and filtered with a standard sieve having a sieve-opening of 74 &mgr;m, wherein the dissolution rate of the detergent particles is calculated by Equation (1): Dissolution Rate (%)=(1âˆ’(T/S))Ã—100â€ƒâ€ƒ(1) â€ƒwherein S is a weight (g) of the detergent particles supplied; and T is a dry weight (g) of remaining insolubles of the detergent particles remaining on the sieve when a liquid prepared under the above stirring conditions is filtered with the sieve, wherein drying condition for the remaining insolubles are kept at a temperature of 105Â° C. for 1 hour, and then in a desiccator with a silica gel at 25Â° C. for 30 minutes, wherein the detergent particles are a collective of a detergent particle comprising a base particle comprising a water-soluble salt comprising sodium carbonate and 2 to 30% by weight of a water-soluble polymer, and from 5 to 80 parts by weight of a surfactant supported by 100 parts by weight of the base particle, and wherein the detergent particles comprise a detergent particle having pores in the inner portion thereof having a size of one-tenth to four-fifth of the particle size.