Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Solid – shaped macroscopic article or structure
Reexamination Certificate
2000-06-15
2003-11-11
Douyon, Lorna M. (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Solid, shaped macroscopic article or structure
C510S294000, C510S298000, C510S447000
Reexamination Certificate
active
06645931
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a solid-shaped detergent.
2. Discussion of the Related Art
The solid-shaped detergent has merits of not necessitating to measure, easy handling, and being compact, taking up a little storage space. An example thereof is a tablet detergent prepared by compressing or densifying a usual detergent, which has been marketed in Europe and the like.
However, these solid-shaped detergents do not sufficiently satisfy two important features as manufactures, i.e. having sufficient mechanical strength during drying, and rapidly distributing and dissolving when supplied in water. For instance, European Patent Publication 0711828 and Japanese Patent Laid-Open No. Hei 10-183199 each discloses a tablet detergent having improved dissolubility which can be molded at a low compression pressure, the tablet detergent being prepared by compression-molding after coating a detergent particle, or at least a part thereof with a binder, and a manufacturing process thereof.
In addition, WO98/24873 discloses a tablet detergent prepared by forming a shell with a coating agent such as a dicarboxylic acid on a compressed detergent composition. These tablet detergents are effective as a detergent composition having improved disintegration-promoting property and dissolubility, as compared to a composition obtained simply by directly tableting the constituent particle, or the like.
However, the disintegration-promoting property and the dissolubility of the solid-shaped detergent are greatly dependent upon the disintegration-promoting property and the dissolubility of the detergent particle itself constituting the detergent. In addition, even though the most important feature in the washing operation is to release detergent components in the detergent particle into washing water, the properties or structure of the detergent particle itself has not been sufficiently studied. For instance, in none of the marketed solid-shaped detergents mentioned above, the disintegration-promoting property and the dissolubility of the detergent particle itself are not sufficient, so that the disintegration-promoting property and the dissolubility of the solid-shaped detergent itself are consequently unsatisfactory.
An object of the present invention is to provide a fast-dissoluble, solid-shaped detergent having sufficient mechanical strength during drying, and being capable of quickly dissolving in water after supply.
The above and other objects of the present invention will be apparent from the following description.
SUMMARY OF THE INVENTION
In sum, the present invention pertains to:
[1] a solid-shaped detergent comprising particles for detergent, comprising a particle capable of releasing a bubble from an inner portion of the particle in a process of dissolving the particle in water, the bubble having a size of one-tenth or more of a particle size of the particle, and wherein the particles have a dissolution rate of 90% or more, under conditions where the particles are supplied in water at 5° C.; stirred for 60 seconds under the stirring conditions that 1 g of the particles are supplied to a 1-L beaker having an inner diameter of 105 mm which is charged with 1 L of hard water having 71.2 mg CaCO
3
/L, 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 as defined by JIS Z 8801, wherein the dissolution rate of the particles is calculated by the Equation (1):
Dissolution Rate (%)=[1−(
T/S
)]×100 (1)
wherein S is a weight (g) of the particles supplied; and T is a dry weight (g) of insoluble remnants of the particles remaining on the sieve when an aqueous solution prepared under the above stirring conditions is filtered with the sieve; and
[2] a solid-shaped detergent comprising particles for detergent comprising base particles for supporting a surfactant and/or detergent particles prepared by supporting a surfactant to the base particles, wherein each base particle comprises a water-insoluble inorganic compound, a water-soluble polymer and a water-soluble salt, wherein the base particle has a localized structure in which larger amounts of the water-soluble polymer and/or the water-soluble salt are present near the surface of the base particle rather than in the inner portion thereof, and wherein the particles have a dissolution rate of 90% or more, under conditions where the particles are supplied in water at 5° C.; stirred for 60 seconds under the stirring conditions that 1 g of the particles are supplied to a 1-L beaker having an inner diameter of 105 mm which is charged with 1 L of hard water having 71.2 mg CaCO
3
/L, 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 as defined by JIS Z 8801, wherein the dissolution rate of the particles is calculated by the Equation (1):
Dissolution Rate (%)=[1−(
T/S
)]×100 (1)
wherein S is a weight (g) of the particles supplied; and T is a dry weight (g) of insoluble remnants of the particles remaining on the sieve when an aqueous solution prepared under the above stirring conditions is filtered with the sieve.
DETAILED DESCRIPTION OF THE INVENTION
1. Solid-Shaped Detergent
1.1. Definition
In the present invention, the term “solid-shaped detergent” refers to those comprising particles for detergent having fast dissolubility, wherein the particles comprise, for instance, base particles for supporting a surfactant (hereinafter simply referred to as “base particles”) and/or fast-dissoluble detergent particles; and separately added components other than the detergent particles (detergent components: a known detergent particle, a builder, a fluorescent dye, an enzyme, a perfume, a defoaming agent, a bleaching agent, a bleaching activator, a binder, a disintegration-promoting agent, and the like), wherein the detergent has a solid form such as tablet, briquette or bar. The term “base particle for supporting a surfactant” (hereinafter simply referred to as “base particle”) refers to a base particle comprising a water-insoluble inorganic compound, a water-soluble polymer and a water-soluble salt, wherein the base particle is capable of supporting a surfactant or the like, and the term “base particles” refers to an aggregate thereof The term “fast-dissoluble detergent particle” refers to a detergent particle comprising a base particle and a surfactant, wherein the surfactant is supported to the base particle, and the term “fast-dissoluble detergent particles” refers to an aggregate thereof. The term “particles” refers to an aggregate of various particles constituting the detergent.
1.2. Composition and Preparation Process
One feature of the solid-shaped detergent of the present invention resides in that the solid-shaped detergent comprises particles for detergent having fast dissolubility. The particles include, for instance, base particles and/or fast-dissoluble detergent particles. As described below, in these particles, since the particle itself has high disintegration-promoting property/dissolubility ascribed to its chemical and physical structure, the solid-shaped molded product comprising the particles also exhibits remarkably high disintegration-promoting property/dissolubility, as compared to a solid-shaped detergent prepared by molding a known detergent particle. In addition, in the present invention, the solid-shaped detergent having excellent disintegration-promoting property/dissolubility can be obtained by not only containing these particles (fast-dissoluble detergent particles and/or base particles), but also simultaneously containing known detergent particles or detergent components together with the particles. For instance, a known compact detergent particle (for instance, “ATTA
Takaya Hitoshi
Yamaguchi Nobuyoshi
Yamaguchi Shu
Yamashita Hiroyuki
Yanagisawa Yuhki
Douyon Lorna M.
Kao Corporation
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