CN1369002A - Detergent particle swarm - Google Patents

Abstract

Detergent particles comprising 5 to 50 wt% of a phosphate builder, 5 to 40 wt% of an anionic surfactant and 1 to 30 wt% of a nonionic surfactant, wherein the detergent particles have an average particle diameter of 150 to 500 μm, a bulk density of 500g/L or more and a flow time of 10 seconds or less, and the detergent particles comprise detergent particles having cells with a diameter of 1/10 or more which can be released from the interior of the particles in the process of dissolving in water, and the dissolution rate of the detergent particles calculated by the formula is 90% or more. The dissolution rate (%) of the formula = { 1- (T/S) } × 100S: the input weight of detergent particles (g) T: the dry weight (g) of the residues of the detergent particles remaining on the sieve when supplied to the sieve.

Description

Detergent particle swarm

technical field

The present invention relates to a detergent particle group and a detergent composition containing the detergent particle group.

Background technique

Powdered heavy-duty detergent can be used for washing in a washing machine, but sometimes it can be used for hand washing when there is a lot of dirt on the fibers. In hand washing, in order to make the concentrated detergent solution react with dirt, according to the generally known experience, the washing effect will be better when the powdered heavy detergent is directly sprinkled on the washed part wetted by water. At this time, in order to bring the parts to be washed or the parts to be washed and other fiber parts into contact with each other by hand, sufficient foaming is required for good lubrication between fibers. In particular, powdery heavy-duty detergents containing phosphate builders rich in anionic surfactants exhibit sufficient foaming properties during hand washing and have the advantage of good lubrication between the so-called laundry. In addition, the powder flowability must also be high in order to directly sprinkle the desired amount of powdered heavy detergent.

On the other hand, in order to improve the conveying efficiency and the user's convenience in conveying or measuring, it is necessary to increase the density of the powder heavy detergent. However, there is a concern that the solubility may be poor due to the densification of the detergent particles. Especially in hand washing, there is concern that the detergent particles are difficult to dissolve during washing or that the foaming speed for imparting lubrication between cloths is reduced.

On the other hand, the design of the washing machine also takes into account the needs of consumers and water and energy saving. For example, in the mid-1990s, washing machines made in Japan tended to increase capacity and save water, and set a short-time washing mode and a weak agitation mode to reduce wear and tear on clothes. These are all for the purpose of reducing the workload of the washing machine (meaning of mechanical force × time), but there are still major problems such as the solubility of the detergent particles is greatly reduced, the washing power is poor, and the dissolved residue remains on the clothes. In addition, in European-made washing machines and American-made washing machines, from the viewpoint of energy saving during washing, it is important to lower the washing temperature, so it is required to use a detergent with good solubility.

From the above situation, in order to wash efficiently not only in the washing machine but also in hand washing, it is required to have a high fluidity, high-speed dissolution, fast foaming, easy washing, and rapid disappearance of aggregates of detergent particles. Detergent with phosphate builder.

However, the solubility of conventional high-density heavy-duty detergents containing phosphate builders is insufficient. For example, in JP-A No. 2-49100, it is disclosed that the spray-dried particles rich in anionic active agent are stirred and granulated; A method of granulating by adding a liquid binder after neutralizing the acid precursor of the anionic active agent in dry form with an alkaline agent. These compositions have high foaming properties due to the high mixing ratio of anionic active agent/nonionic active agent, but their solubility is insufficient. In order to improve the solubility, when the obtained detergent particle group is simply granulated, there is a problem that the fluidity of the powder is low, and the detergent powder is difficult to interact with the clothes during hand washing and washing at low water temperature in the washing machine When the detergent particles form agglomerates. In addition, in JP-A No. 52-110710, a detergent containing a phosphate synergist showing high fluidity is disclosed, which is characterized in that about 12 to 30 wt. % of the nonionic active agent, but the solubility is insufficient, and the foaming property is also insufficient due to the high content of the nonionic active agent. Japanese Patent Publication No. 6-49879 discloses that as a surfactant composition suitable for washing methods, it is desirable to contain a relatively large amount of anionic surfactant in products for hand washing. However, in order to improve the washing efficiency during hand washing, due to its high fluidity and fast dissolution rate, it is not possible to obtain a detergent that foams quickly, is easy to wash, and contains a phosphate builder.

disclosure of invention

The object of the present invention is to provide a phosphate-containing high-density powder detergent containing an anionic surfactant with high foaming properties, which is easy to wash when washing by hand, and contains detergent particles that improve particle solubility and fluidity, and A detergent composition containing the detergent particle group. Another object of the present invention is to provide a high-density detergent particle group containing phosphate with excellent detergency and a detergent particle group containing the phosphate for excellent particle solubility and dispersibility even when the workload and washing temperature of the washing machine are low. Detergent composition of agent particle group.

These and other objects of the present invention will be apparent from the description below.

That is, the present invention relates to,

[1] is a detergent particle group containing a phosphate builder, which is a detergent particle group having an average particle diameter of 150 to 500 μm, a bulk density of 500 g/L or more, and a flow time of 10 seconds or less. The detergent particle group is In the process of dissolving in water, there are detergent particles that can release air bubbles with a diameter of 1/10 or more of the particle diameter from the inside of the particles, and the detergent particle group is put into water at 5°C and stirred using the stirring conditions shown below Detergent particles whose dissolution rate calculated by formula (1) is 90% or more when fed to a standard sieve (74 μm opening) specified in JIS Z8801 after 60 seconds,

Stirring conditions: 1 g of the detergent particle group was dropped into 1 liter of hard water (71.2 mg CaCO ₃ /L, Ca/Mg molar ratio 7/3), and a stirring bar (length 35 mm, diameter 8mm) for stirring, rotating speed 800rpm

Dissolution rate (%)={1-(T/S)}×100 (1)

S: input weight of detergent particle group (g)

T: When the aqueous solution obtained by the above-mentioned stirring conditions is supplied to the above-mentioned sieve, the dry weight of the dissolved residue of the detergent particle group remaining on the sieve;

[2] is a detergent particle group containing a phosphate builder, which is a detergent particle group with an average particle diameter of 150 to 500 μm, a bulk density of 500 g/L or more, and a flow time of 10 seconds or less. A detergent particle group in which a surfactant is carried on a base particle of a phosphate builder, a water-soluble polymer, and a water-soluble salt from which the phosphate builder is removed, and the base particle has a structure in which the ratio near the surface is greater than that present in the interior When the detergent particle group is poured into water at 5°C and stirred for 60 seconds under the stirring conditions shown below, and supplied to a standard sieve (74 μm in opening) specified in JIS Z 8801, the gradient property of the water-soluble polymer is large, The detergent particle group whose dissolution rate of the detergent particle group calculated by the above formula (1) is 90% or more;

[3] A method for producing the detergent particle group according to the above [1] or [2], comprising the following steps:

Step (a): preparing a slurry containing a phosphate synergist, a water-soluble polymer, and water-soluble salts that remove the phosphate synergist, and 60% of the water-soluble components of the water-soluble polymer and the water-soluble salts % above the process of dissolving the slurry,

Step (b): a step of spray-drying the slurry obtained in step (a) to prepare a matrix particle group,

Step (c): a step of adding a surfactant to the matrix particles obtained in the step (b) to support them;

[4] A detergent composition containing 50% by weight or more of the detergent particle group described in [1] or [2].

A brief description of the drawings

FIG. 1 is a comparison diagram showing the results of measuring the base particle group 1 in its original state or the state in which the base particle group 1 was uniformly crushed by FT-IR/PAS. The solid line is the data of the base particle group in the intact state, and the dotted line is the data of the base particle group in the uniformly crushed state.

Best way to implement the invention

The detergent particle of the present invention refers to a particle containing a surfactant, a builder, etc., and the detergent particle group refers to an aggregate thereof. Said detergent composition refers to containing the detergent particle group, and further contains additional detergent components (for example, synergist particles, fluorescent dyes, enzymes, fragrances, antifoaming agents, bleaching powder, bleach activators, etc.). 1. Mechanism of high-speed solubility 1.1. High-speed solubility due to bubble release

Conventional dense detergent particles show a dissolution process of slowly dissolving from the vicinity of the surface of the detergent particles, so it takes a relatively long time to completely dissolve.

On the other hand, the detergent particle group of the present invention contains detergent particles capable of emitting air bubbles with a diameter of 1/10 or more of the particle diameter from the inside of the particle during the process of being dissolved in water (hereinafter referred to as the bubble-releasing detergent). particle). The bubbles release the detergent particles. In the process of dissolving in water, at first, if a small amount of water is immersed in the inside of the particles, bubbles of a predetermined size can be released from the inside of the particles. Then, by immersing a large amount of water in the inside of the particles, The disintegration of the particle itself (self-disintegration of the particle) causes dissolution and disintegration not only from near the surface but also from the inside of the particle.

In such a dissolution process, when the bubble-releasing detergent particles are dissolved in water, the particle size of the particles released is 1/10 or more, preferably 1/5 or more, more preferably 1/4 or more, most preferably The phenomenon of bubbles having a diameter of 1/3 or more (hereinafter referred to as bubbles of a predetermined size) can be confirmed with a digital microscope, an optical microscope, or the like. On the contrary, in conventional dense detergent particles, the size of all generated bubbles is less than 1/10 of the particle diameter, and the particles themselves cannot self-disintegrate, so sufficient high-speed solubility cannot be obtained. In addition, when the detergent particles releasing bubbles are dissolved in water in a static state, bubbles of a predetermined size are preferably generated within 120 seconds, more preferably within 60 seconds, and most preferably within 45 seconds.

The bubble-releasing detergent particles may have pores (single number or plural numbers) capable of releasing bubbles of a predetermined size, and the shape and structure of the particles are not particularly limited. For example, it can be the uninuclear detergent particles described in Item 4. In addition to uninuclearity, for example, it can also be a detergent particle in which uninuclear matrix particles are aggregated (hereinafter referred to as multinuclear detergent particles). Particles. Described in items 6 and 7). Moreover, it is preferable to contain 40 weight% or more of air-bubble releasing detergent particles in a detergent particle group, More preferably, it is 60 weight% or more, Most preferably, it is 80 weight% or more.

The bubble diameter is measured as follows.

Double-sided adhesive tape was attached to the center of the bottom surface of a glass dish (inner diameter 50 mm). Attach the detergent particle population to the double sided tape. First, from an image obtained using a digital microscope, the equivalent circle diameter (α μm) of each particle was measured. As a digital microscope, for example, "YH-6300" manufactured by KEYENCE Corporation can be used.

Next, 5 ml of ion-exchanged water at 20° C. was poured into the glass dish, and the dissolution process of each particle to be measured was observed. When the bubbles are released from the inside of the particles, the equivalent circular diameter (βµm) of the bubbles is measured from the image at the moment when the bubbles detach from the particles. In addition, when a large number of air bubbles are released from the inside of the particle, the maximum value of the circle-equivalent diameter measured for each air bubble is β μm. The ratio (β/α) of the bubble diameter to the particle diameter was obtained for each particle.

For excellent air-bubble-releasing detergent particles, pores of 1/10 to 4/5 of the particle diameter, preferably 1/5 to 4/5 of the diameter, are present in the particle.

The pore diameter can be measured as follows.

Cut with a knife or the like on the surface including the largest particle size without destroying the selected particles. Observe the cut surface with a scanning electron microscope (SEM), and measure the circle equivalent diameter (pore diameter) (δμm) of the cut surface of the cut particles (rμm) and when pores are confirmed inside the particles. ). In addition, when confirming a large number of pores, among them, the circle-equivalent diameter with respect to the largest pore is taken as δμm. The ratio (δ/r) of the pore diameter to the particle diameter was obtained.

The bubble-releasing detergent particles are mononuclear, and are ideal from the viewpoint of dramatically increasing the dissolution rate.

In addition, when the bubble-releasing detergent particles are composed of the base particles described in the second item, it is desirable to have 1/10 to 4/5 of the particle diameter inside the base particles, preferably 1/5 to 4 The structure of the pores with a diameter of /5. The pore diameter can be measured by the above-mentioned method. 1.2 High-speed solubility due to the gradient of matrix particles

In the detergent particle group of the present invention, in addition to the dissolution mechanism due to the above-mentioned release of air bubbles, high-speed solubility from the particle surface can be confirmed simultaneously with the above-mentioned dissolution mechanism. It is characterized in that the detergent particle group composed of a surfactant is carried in the matrix particle group containing a phosphate synergist, a water-soluble polymer, and a water-soluble salt for removing the phosphate synergist, and in the matrix particle group In the structure, the gradient of the water-soluble polymer exists more near the surface than inside (hereinafter referred to as the gradient of the matrix particles). The matrix particle of the water-soluble polymer in which more gradients exist near the surface exhibits a dissolution behavior that promotes disintegration from the particle surface of the detergent particle by dissolving the water-soluble components near the surface faster in water, expressible High speed solubility. in addition. As the best form to express high-speed solubility, it has the above-mentioned gradient and is also a bubble-releasing detergent particle. In this case, not only mononuclear detergent particles but also polynuclear detergent particles may be used. 2. Composition of matrix particle group

The base particle group constituting the detergent particle group of the present invention mainly refers to a group composed of a phosphate synergist (A), a water-soluble polymer (B) and a water-soluble salt (C) excluding the phosphate synergist. , and particles used to support surfactants, and their aggregates are called matrix particles.

As component (A), it is ideal to be tripolyphosphate, orthophosphate, and pyrophosphate, but the content of tripolyphosphate accounts for more than 60% by weight in the total phosphate synergist, preferably more than 70% by weight , most preferably more than 80% by weight, at this time, the content of ideal orthophosphate is 1-10% by weight, and the content of pyrophosphate is 2-10% by weight (the weight ratio is calculated as anhydrous). In addition, as the counter ion, alkali metals are preferable, and sodium and/or potassium are particularly preferable. Moreover, it is preferable that the compounding quantity of a phosphate builder is 3-60 weight% in a detergent composition.

Examples of the component (B) include carboxylic acid-based polymers, carboxymethyl cellulose, soluble starch, sugars, and the like, among which carboxylic acid-based polymers are preferred.

In particular salts of acrylic acid-maleic acid copolymers and polyacrylates are suitable. The molecular weight is preferably 1,000 to 80,000.

In addition, polymers such as polyglyoxylate, cellulose derivatives such as carboxymethylcellulose, and aminocarboxylic acid-based polymers such as polyaspartate can also be used.

The component (C) is a water-soluble salt except for the component (A), and examples thereof include inorganic salts such as carbonates, bicarbonates, sulfates, sulfites, bisulfates, and halides (salts). Low molecular weight water-soluble organic acid salts such as citrate and fumarate. Among them, preferred are carbonates, sulfates, and sulfites. Particularly preferred are sodium carbonate, potassium carbonate, sodium sulfate. This inorganic salt is ideal in terms of thermally expanding air bubbles in the detergent particles and promoting self-disintegration of the particles by reacting with water to generate heat of hydration and heat of dissolution after preparing the base particle group.

Here, sodium carbonate is ideal as an alkaline agent that exhibits a suitable pH buffer region in the washing liquid. As other alkaline agents, there are amorphous and crystalline silicates. Amorphous silicate (water glass) is widely used as an alkali agent as a raw material for detergents, and also has an effect of increasing the particle strength of matrix particles. JP-A-6-49879 discloses that the particle strength of a spray-dried carrier composed of sodium sulfate, sodium carbonate, nonionic surfactant, and sodium polyacrylate is improved by containing sodium silicate. In addition, in JP-A-52-110710, an amorphous silicate is used in order to increase the particle strength of the matrix particles. However, when the matrix particles are enriched with silicate, the solubility is impaired. The compounding amount of the amorphous silicate is preferably less than 8% by weight, more preferably less than 5% by weight, more preferably less than 3% by weight, and most preferably substantially no .

In addition, salts with a high degree of dissociation such as sulfate and sulfite can increase the ionic strength of the washing liquid, and can have a suitable effect on washing sebum and dirt. In addition, sulfite has the effect of reducing hypochlorite ions contained in tap water, thereby preventing oxidative deterioration of detergent components such as enzymes and fragrances. As the organic salt, a base expected to have a large metal ion capturing ability pKCa ²⁺ and/or a large cation exchange capacity is preferable. In addition to citrate or fumarate, methyl imino diacetate, imino disuccinate, ethylenediamine disuccinate, taurine diacetate, hydroxyethyl Imino diacetate, β-alanine diacetate, hydroxyimino disuccinate, methylglycine diacetate, glutamic acid diacetate, aspartic acid diacetate, Serine diacetate, etc.

In addition, if anions such as sulfate and sulfite other than carbonate or cations such as potassium or ammonium other than sodium are mixed in the matrix particles, it is effective in blocking resistance.

As the composition of the base particle group, the component (A) is preferably 5 to 90% by weight, more preferably 10 to 70% by weight, and most preferably 15 to 60% by weight. Component (B) is preferably 2 to 30% by weight, more preferably 3 to 20% by weight, most preferably 5 to 20% by weight. In particular, in order to express higher particle strength, it is preferably 5% by weight or more, more preferably 7% by weight. Component (C) is preferably 5 to 78% by weight, more preferably 10 to 70% by weight, even more preferably 10 to 67% by weight, particularly preferably 20 to 60% by weight, and most preferably 20 to 60% by weight. 55% by weight. In addition, when an amorphous silicate is used as the alkali agent, from the viewpoint of solubility, the compounding amount of the amorphous silicate in the matrix particles is preferably less than 3% by weight, more preferably It is less than 1% by weight, most preferably not substantially contained. In addition, the compounding quantity of a water-soluble polymer is desirably 2 weight% or more, Preferably it is 4 weight% or more, Most preferably, it is 6 weight% or more. In addition, it is desirably 30% by weight or less, preferably 25% by weight or less, and most preferably 20% by weight or less. Within these ranges, it is preferable to have a structure in which the vicinity of the surface of the base particles is coated with a water-soluble polymer. The coating layer is sufficiently formed on the surface of the particles and sufficiently strong particle strength can be obtained. Moreover, it is preferable also from the viewpoint of the solubility of a detergent composition.

In addition, in addition to these three components, auxiliary components such as fluorescent dyes, pigments, and dyes may be contained in the base particle group. Among them, the use of water-insoluble inorganic substances such as zeolite is suitable for increasing the gradient of the matrix particles.

In addition, if surfactants, especially anionic surfactants, are enriched in matrix particles, the particle strength will be reduced. The content of anionic surfactant in the base particles is preferably less than 10% by weight, more preferably less than 7% by weight, most preferably less than 5% by weight. The anionic surfactant is preferably contained in a surfactant mixture described later and supported on the base particles.

As the water-insoluble inorganic substance, it is preferable that the average particle diameter of the primary particles is 0.1 to 20 μm, for example, there are crystalline or amorphous alumina silicate or silica, hydrated silicic acid compound, and beads , bentonite and other clay compounds.

In order to obtain the desired particle strength and bulk density, the surfactant is not essentially an essential component of the matrix particles, but by adding it to the slurry prepared in the step (a), the drying efficiency of the step (b) can be improved, so it can also be added . The amount added is preferably 10% by weight or less, more preferably 0.1 to 10% by weight, and most preferably 0.1 to 5% by weight in the slurry. In addition, the compounding quantity of these is a value based on the solid content of a slurry.

The higher the carrying capacity of the base particles, the easier it is to express high-speed solubility even if a large amount of surfactant is added.

As a factor for improving the supporting capacity of the base particles, two types of carbonate and sulfate are mentioned as water-soluble salts except for the phosphate synergist. As the carbonate, it is preferable to use sodium carbonate and/or potassium carbonate at 10% by weight or more, and as the sulfate, it is preferable to use sodium sulfate at 3% by weight or more, and these are used in the base particles. In particular, when the content of the phosphate synergist is less than 20% by weight, it is desirable to use the ratio of sodium sulfate/carbonate at 2/1 to 1/4 in this case. Another factor for improving the supporting capacity of the base particles is the use of a base with a high supporting capacity (oil absorbing capacity) on the water-insoluble inorganic substance. For example, A-type zeolite is also ideal in terms of metal ion trapping ability and economical efficiency. Here, the value of the oil absorption ability of the A-type zeolite according to the JIS K 5101 method is 40 mL/100 g or more (for example, a trade name: Feng Synergist; manufactured by Tosoh Co., Ltd.). In addition, P type (for example, trade name Doucil A24 or ZSE064, etc.; manufactured by Crosfield Corporation; oil absorption capacity of 60 to 150 mL/100 g) or X type (for example, trade name: Wessalith XD; manufactured by Degussa Corporation; oil absorption capacity of 80 to 100 mL/100 g ), the mixed zeolite recorded in WO 98/42622 pamphlet, etc. In addition, as the water-insoluble inorganic substance, amorphous silica, amorphous alumina silicate, etc., which have a low ability to capture metal ions but have a high oil absorption ability can also be used. For example, JP-A No. 62-191417, line 19 in the lower right column on page 2 to line 17 in the upper left column on page 5 (in particular, the initial temperature is preferably in the range of 15 to 60° C.), Amorphous alumina silicate described in the 20th line of the lower right column on page 2 to the 11th line of the lower left column on page 5 of Kokai No. 62-191419 (especially oil absorption, preferably 170mL/100g.), Or JP-A-9-132794, line 46, column 17 to line 38, column 18, JP-A-7-10526, column 3, line 3-column 5, line 9, JP-A-6-227811 Amorphous alumina silicate (oil absorption capacity 285mL/100g) described in column 2, line 15 to column 5, line 2, and JP-A-8-119626, column 2, line 18 to column 3, line 47 .)wait.

For example, "TOKSIL NR" (manufactured by Tokuyama Soda Co., Ltd.: oil absorption capacity 210-270mL/100g), "FLOWRITE" (same as above: oil absorption capacity 400-600mL/100g), "TIXOLEX 25" (Hanbulo Oil-absorbing carriers such as "SILOPURE" (manufactured by Fuji Devison Co., Ltd.: oil-absorbing capacity: 240-280 mL/100g) manufactured by Chemical Corporation: oil-absorbing capacity: 220 to 270 mL/100 g). In particular, as the oil-absorbing carrier, it is preferable to have the oil-absorbing carrier described in the 4th line of the JP-A No. 5-5100 to the 6th line of the 6th line (especially the oil-absorbing carrier of the 4th column, the 43rd to the 49th line) or the JP-A-6. -The nature described in column 12, line 12 to column 13, line 17, and column 17, line 34 to column 19, line 17 of Publication No. 179899.

In the present invention, from the viewpoint of maintaining high solubility (no deterioration) even after long-term storage, it is preferable that the SiO ₂ /Al ₂ O ₃ (molar ratio) is 4.0 or less, preferably 3.3 or less. Aluminum silicates. 3. Gradient of matrix particles

As a method for confirming the gradient of the matrix particles, for example, a combination of Fourier transform infrared spectroscopy (FT-IR) and photoacoustic spectroscopy (PAS) (abbreviated as "FT-IR/PAS") can be used. FT-IR/PAS can confirm the distribution state of substances from the surface of the sample to the depth direction as described in APPLIED SPECTROSCOPY vol.471311-1316 (1993). Hereinafter, the measurement method will be described.

The structure of the base particles can be determined by filling the measurement cell with base particles in two different states and performing FT-IR/PAS measurement and comparing them. That is, FT-IR/PAS measurement was performed on the base particles while maintaining the set structure, and the comparison sample was sufficiently pulverized in an agate mortar or the like to make the base particles in a uniform state, and then FT-IR/PAS measurement was performed. The measurement is performed, for example, using an infrared spectrophotometer FTS-60A/896 manufactured by Bio-Rad Laboratories, and a photoacoustic detector Model 300 manufactured by MTEC as a PAS measurement cell. The measurement conditions are: decomposition energy 8 cm ^-1 , scanning speed 0.63 cm/s, and accumulation 128 times. This measurement condition includes information from the surface of the base particle to about 10 µm. In the PAS spectrum of the matrix particles, for example, the characteristic peaks of sodium tripolyphosphate and sodium polyacrylate are made around 900 cm ^-1 (the inverse symmetric stretching vibration of POP is a peak in a wide range of 850 to 950 cm ^-1 ) And 1576cm ^-1 (the inverse symmetric stretching vibration of CO ^2- ), read the area intensity of the peak. The relative area strength and water solubility of the characteristic peak of the water-soluble polymer with respect to the characteristic peak of the phosphate synergist obtained for each state when the structure of the matrix particle is maintained and when it is measured in a uniform state after pulverization Comparison of the relative area intensities of the polymer characteristic peaks to the phosphate synergist characteristic peaks allows the structural characterization of the matrix particles. In addition, when zeolite is contained in the matrix particles, it can be inferred that the relative area strength of the characteristic peak of the water-soluble polymer to the characteristic peak of zeolite (1009 cm ^-1 ; inverse symmetric stretching vibration of Si-O-Si) is compared. above features. Specifically, it can be proved that said richness can be demonstrated by the fact that the water-soluble polymer is richer in the vicinity of the surface than in the interior, while the composition of the phosphate builder and matrix particles in the interior contains a large amount of water-insoluble inorganic matter than that in the vicinity of the surface. Contains a gradient of water-insoluble inorganic substances.

Regarding the base particles, if the relative area intensity of the characteristic peak of a phosphate synergist such as tripolyphosphate when measured in a state where the gradient structure of the components is maintained is different from that of the phosphate synergist when measured in a uniform state after pulverization The relative area intensities of the active agent characteristic peaks are calculated, and their ratios are found to be 1.1 or more, preferably 1.3 or more, and most preferably 1.5 or more for water-soluble polymers. When it has these relative area strengths, it can be said that it has a gradient structure.

Furthermore, even for water-soluble salts such as carbonates excluding the phosphate synergist, the relative area intensity of the characteristic peak with respect to the phosphate synergist is 1.1 or more, preferably 1.3 or more. excellent program.

Figure 1 shows the results of FT-IR/PAS measurement with the base particles intact or uniformly crushed, and normalized by the peak intensity of sodium tripolyphosphate. It can be seen from Fig. 1 that the relative area strength of sodium polyacrylate to sodium tripolyphosphate when the base particles are measured in an intact state is higher than the relative area strength when measured in a uniform state after pulverization. In addition, FIG. 1 also shows that sodium tripolyphosphate has a high relative area strength to sodium carbonate (characteristic peak 1434 cm ^-1 : stretching motion of CO ₃ ^2- ). In addition, the base particle shown in FIG. 1 is the base particle group 1 using the product of this invention shown in the Example mentioned later.

As another example of the method for analyzing the structure of the matrix particles, energy dispersive X-ray spectroscopy (EDS) or electron probing minute fraction analysis (EPMA) can be used. These analysis methods can analyze the binary distribution of elements by scanning the sample surface with an electron beam. For example, as an energy dispersive X-ray analyzer, EMAX 3770 manufactured by Holiba Seisakusho, which belongs to SEM such as S-4000 Field Emission Scanning Electron Microscope manufactured by Hitachi, can be used.

When matrix particles are embedded in resin, the distribution state of elements measured for C, Na, P, and S on the cut surface of matrix particles cut out with a microtome, and when using zeolite, etc., for Al, Si, etc., It can be confirmed that Na, S, and C are formed on the outer side of the particle section, and the element distribution is rich in P, Al, and Si in the central part, which means that the water-soluble polymer is rich in the vicinity of the surface, and the phosphate synergist is rich in the central part. , and then the structure of the matrix particles of water-insoluble inorganic substances. 4. Detergent particle group and matrix particles containing mononuclear detergent particles

The detergent particle group of the present invention preferably contains mononuclear detergent particles from the viewpoint of fluidity and high-speed solubility of the detergent particle group. The "mononuclear detergent particle" refers to a detergent particle in which a surfactant is supported on a base particle, and a single detergent particle has a base particle as a core.

As a factor expressing mononuclearity, the particle growth rate defined by the following formula can be used, and it is preferably 1.5, more preferably 1.3 or less, and most preferably 1.2 or less.

Particle growth length=(average particle diameter of the final detergent particle group)/(average particle diameter of the base particle group)

The "final detergent particle group" refers to either a detergent particle group in which a surfactant is supported on a base particle group or a detergent particle group in which surface modification treatment is performed on the particle group.

In the present invention, examples of the surfactant carried on the base particles include anionic surfactants and nonionic surfactants, and if necessary, one or more types of amphoteric surfactants and cationic surfactants.

As anionic surfactants, preferred are alcohols or sulfate ester salts of the alkoxides, alkylbenzene sulfonates, paraffin sulfonates, α-olefin sulfonates, α-sulfofatty acid salts or the esters salt or fatty acid salt. It is particularly desirable to have an alkyl chain with 10 to 14 carbon atoms, more preferably a linear alkylbenzene sulfonate with 12 to 14 carbon atoms, and as a counter ion, preferably an alkali metal or an amine, particularly preferably are sodium, potassium, monoethanolamine and diethanolamine.

Examples of nonionic surfactants include polyoxyalkylene alkyl ethers, alkyl polyglycosides, polyoxyalkylene alkylphenyl ethers, polyoxyalkylene sorbitan fatty acid esters, polyoxyalkylene Alkylene glycol fatty acid esters, polyoxyethylene polyoxypropylene block polymers, polyoxyalkylene alkanolamides, and the like.

It is particularly preferable to add 4 to 20 moles of ethylene oxide or propylene oxide to an alcohol with 10 to 18 carbon atoms [HLB value (calculated by Griffin method) is 10.5 to 15.0, preferably 11,0-14.5] of polyoxyalkylene alkyl ethers or polyoxyalkylene alkanolamides.

The amount of the surfactant is preferably 5 to 80 parts by weight, more preferably 5 to 60 parts by weight, more preferably 10 to 60 parts by weight, and most preferably Preferably it is 20-60 weight part. Here, the supported amount of the anionic surfactant is preferably 1 to 60 parts by weight, more preferably 1 to 50 parts by weight, and most preferably 3 to 40 parts by weight. The loading amount of the nonionic surfactant is preferably 1 to 45 parts by weight, more preferably 1 to 35 parts by weight, most preferably 4 to 25 parts by weight. From the point of view of the foaming property, washing ability and the physical properties of the surfactant mixture carried during hand washing, it is best to use anionic surfactants and nonionic surfactants in combination. At this time, the mixing ratio (weight ratio) of anionic surfactant/nonionic surfactant is 4/1 to 1/3, preferably 3/1 to 1/2, more preferably 2/1 to 1/3 1.5. In addition, amphoteric surfactants and cationic surfactants may be used in combination. The supported amount of the surfactant mentioned here does not include the added amount of the surfactant when the surfactant is added at the time of slurry preparation in the step (a) of Item 5.1 described later.

Suitable physical properties of the base particle group used in the present invention are as follows. 4.1 Physical properties of matrix particle group 4.1.1 Bulk density: 400-1000 g/L, preferably 500-800 g/L. The bulk density is measured by the method specified in JIS K 3362. In this range, the volume density of the detergent particle group is 500 g/L or more and excellent high-speed solubility can be obtained. 4.1.2 Average particle size: 150-500 μm, preferably 180-300 μm. The average particle diameter was determined using a sieve specified in JIS Z 8801. For example, use a 9-sieve sieve with meshes of 2000 μm, 1400 μm, 1000 μm, 710 μm, 500 μm, 355 μm, 250 μm, 180 μm, and 125 μm, and install it on a rotary vibration machine (manufactured by HEIKO SEISAKUSHO, vibration: 156 times/min, rotation: 290 times/minute), after vibrating 100g of sample for 10 minutes to sieve, on the receiving dish and each sieve, according to the order of receiving dish, 125μm, 180μm, 250μm, 355μm, 500μm, 710μm, 1000μm, 1400m, 2000μm, the cumulative calculation For the weight frequency, the sieve opening of the first sieve whose accumulated weight frequency is 50% or more is defined as a μm, and when the mesh size of the sieve opening larger than a μm is defined as b μm, the weight frequency of the sieve from the receiving dish to a μm is When the cumulative calculation of degree is taken as c%, and the weight frequency on the sieve of aμm is taken as d%,

Passable (average particle size) = 10 ^A : $A=\frac{50-(c-\frac{d}{\log b-\log a})\×\log b}{\frac{d}{\log b-\log a}}$ Find out.

In addition, the sieve used is properly adjusted in order to correctly evaluate the particle size distribution of the measurement powder. 4.1.3 Particle strength: in the range of 50 to 2000kg/cm ² , in the preparation process using a surfactant mixture containing anionic surfactants, the preferred particle strength is 100 to 1500kg/cm ² , particularly preferred It is 150 to 1000 kg/cm ² . When the weight ratio of anionic surfactant/nonionic surfactant in the surfactant mixture is 4/1˜1/3, the preferred particle strength is 150˜1000 kg/cm ² . In this range, the base particle group exhibits favorable disintegration properties, and a detergent particle group having excellent high-speed solubility can be obtained. The method of measuring the particle strength is as follows.

Add 20 g of the sample into a cylindrical container with an inner diameter of 3 cm x a height of 8 cm, and vibrate 30 times (Tsutsui Physical and Chemical Instruments Co., Ltd., TVP1-type vibrating densely packed bulk density tester, vibration conditions: cycle 36 times/min, from free fall from a height of 60 mm), and the sample height at this time (initial sample height) was measured. Then, use a pressure testing machine to pressurize the entire upper end surface of the sample held in the container at a speed of 10mm/min, and measure the load-displacement curve. The slope of the linear part with a displacement rate below 5% is multiplied by The value obtained by dividing the height of the initial sample by the area under pressure is taken as the particle strength. 4.1.4 Carrying capacity: 20mL/100g or more, preferably 40mL/100g or more. In this range, it is preferable to suppress the aggregation of matrix particles and maintain the mononuclearity of the particles in the detergent particle group in the formulation process using a surfactant mixture solution containing an anionic surfactant. The measurement method of the carrying capacity is as follows.

100 g of the sample was placed in a cylindrical mixing tank with an internal diameter of about 5 cm x about 15 cm having a stirring blade inside, and while stirring at 350 rpm, linseed oil was added at a rate of about 10 mL/min at 25° C. The input amount of linseed oil at which the stirring power became the highest was taken as the carrying capacity. 4.1.5 Moisture content: The moisture content is 20% by weight or less, preferably 10% by weight or less, and most preferably 5% by weight or less. Within this range, a matrix particle group having excellent physical properties can be obtained. The measuring method of moisture is as follows.

3 g of the sample was placed in a weighing dish, and dried at 105° C. for 2 hours with an electric dryer. The dried sample is weighed, and the moisture content is calculated from the weight of the sample before and after drying, and expressed as a percentage. 4.2 Physical properties of detergent particle populations 4.2.1 Mononuclear properties

The mononuclearity of the detergent particles can be confirmed by at least one of the following (a) method, (b) method, and (c) method.

Method (a): Detergent particles randomly sampled from the vicinity of the average particle size of the detergent particle group are cut, and the presence or absence of matrix particles and the number of them in the detergent particles are observed with a scanning electron microscope (SEM) to confirm Methods.

(b) method: use an organic solvent that does not dissolve the water-soluble polymer in the matrix granules in the detergent granules to extract the organic solvent-soluble components in the detergent granules (for example, in the matrix granules, polymers that exist as water-soluble polymers) Acrylic acid salt, an anionic surfactant (LAS) or a nonionic surfactant as a surfactant, ethanol can be used suitably), and an observation method of observing the organic solvent insoluble component thereafter by SEM. That is, when one matrix particle exists in the organic solvent-insoluble fraction obtained after treating one detergent particle with the above-mentioned organic solvent, it means that it is a mononuclear detergent particle.

(c) method: a method of confirming by detecting the two-dimensional element distribution of the cross-section of the resin-embedded detergent particle by EDS or EPMA. 4.2.2 High-speed solubility 4.2.2.1 Dissolution rate within 60 seconds

The detergent particle group containing the mononuclear detergent particle of this invention has high-speed solubility. The high-speed solvent performance of mononuclear detergent particles can be evaluated by the dissolution rate within 60 seconds. Here, the high-speed solubility of the 60-second solvent ratio of the detergent particle group refers to the detergent particles calculated by the following method as a high-speed measurement method related to the disappearance speed of the detergent particles during hand washing The dissolution rate of the population is 90% or more, preferably 94% or more, most preferably 97% or more.

The above-mentioned test conditions will be specifically described. Fill a 1L beaker (cylindrical type with an inner diameter of 105mm and a height of 150mm, such as the 1L glass beaker of Iwaki Glass Co. _, Ltd. ), while keeping the water temperature at 5°C constant in a water bath, use a stirring rod (35 mm in length, 8 mm in diameter, for example, type: ADVANTEC, Teflon SA (round fine type)) to adjust the water depth to a vortex The depth becomes about 1/3 rotation speed (800rpm) stirring. Put the detergent particle group compressed and weighed to 1.0000±0.0010g into and disperse into water under stirring and continue stirring. After 60 seconds from the input, filter the detergent particle group dispersion liquid in the beaker with a 74 μm standard sieve (diameter 100 mm) specified in JIS Z 8801 with a known weight, and remove the detergent particles in a water-containing state remaining on the sieve The swarm is recovered with a sieve into an open container of known weight. In addition, the operating time from the start of filtration to the recovery of the sieve was 10±2 seconds. The recovered residue of the detergent particle group was dried with an electric dryer heated to 105° C. for 1 hour, and then kept in a desiccator (25° C.) filled with silica gel for 30 minutes, and then cooled. After cooling, the total weight of the dissolved residue of the dried detergent, the sieve and the recovery container was measured, and the dissolution rate (%) of the detergent particle group was calculated from the above formula (1).

In the above-mentioned evaluation method using low-temperature water, the detergent particle group of the present invention exhibits a high dissolution rate. Especially in hand washing, since the detergent particle group and/or aggregates of the detergent particle group dissolve very quickly, there is an advantage that hand washing is easy. The excellent solubility of the present invention not only has the effect of improving the detergency by eluting the detergency components more rapidly in the detergency bath, but also has the effect of improving detergency in the manual washing mode, weak agitation mode, speed washing mode, etc. in the fully automatic washing machine. It has the advantage of high quality that does not leave detergent residue even in mechanical force or short-time washing.

The suitable physical properties of the detergent particle group containing the mononuclear detergent particles obtained in the present invention are as follows. In addition, the measurement methods of the bulk density and the average particle diameter are the same as those of the matrix particles. 4.2.2.2 Hand wash solubility of detergent compositions

The detergent composition of the present invention also exhibits extremely excellent solubility in hand washing as compared with conventional detergent compositions. The hand-washing solubility is a measure of the solubility when the detergent composition is previously dissolved in a container such as a washbasin when hand-washing soiled clothes, and is represented by the dissolution time. Whether it is a user who uses hand washing as the main washing method or a washing machine as the main washing method, according to the washing habit, the contaminated clothes are washed in advance, so the solubility of hand washing is used as a reflection The dimension of good convenience of the detergent is important.

The specific measurement method is to add 5.0L of tap water at 25°C to a polypropylene washbasin with a maximum opening diameter of 31cm, a bottom surface of 24cm, and a height of 13cm (for example, a KW-30 washing bucket manufactured by Yazaki Co., Ltd., with an internal volume of 8.2L). Next, 15 g of the detergent composition to be tested was sprayed uniformly and rapidly (within 3 seconds as an approximate target) over the entire water surface without being fixed at one place. From this point on, the participant spreads 5 fingers with one hand (the usual wrist), and feels the detergent particles existing at the bottom of the washbasin with the fingertips (finger belly side) (lightly touches the bottom of the washbasin with the fingertips) , while starting to stir. Here, the stirring is to use the method of repeating each other to turn right and turn left 5 times periodically, and stir without overflowing the sample solution from the wall of the washbasin (stir for 1 turn for about 1.0 seconds, and reverse for about 1.0 seconds) as an approximate goal). In this way, continue stirring until no detergent particles are felt, and measure the time. The participant repeated the test until the standard deviation of the measurement time for three consecutive measurements of the sample was within ±5%, and the average time of the three measurements was taken as the participant's hand-washing dissolution time.

The test was carried out by more than 10 participants, and for the median 60% of participants excluding the upper 20% and lower 20%, the average value of the hand-washing dissolution time of the participants was calculated as the hand-washing dissolution time of the detergent composition tested. .

The hand washing solubility of the detergent composition of the present invention is preferably 80 seconds or less, more preferably 60 seconds or less, most preferably 40 seconds or less. 4.2.3 Bulk density: more than 500g/L, preferably 500-1000g/L, more preferably 600-1000g/L, most preferably 650-850g/L. 4.2.4 Average particle size: 150-500 μm, preferably 180-400 μm, more preferably 200-350 μm, most preferably 220-300 μm. 4.2.5 Fluidity: In hand washing, detergent particles are often sprinkled on the part to be washed for operation. In order to facilitate this operation, it is important to increase the fluidity of the detergent particle population. The flow time is 10 seconds or less, preferably 8 seconds or less, most preferably 7 seconds or less. The flow time refers to the time required to flow 100ml of powder from the hopper for bulk density measurement specified in JIS K 3362. In order to improve fluidity, the weight frequency of classified particle groups smaller than 125 μm is preferably 0.2 or less, more preferably 0.12 or less, and most preferably 0.07 or less. 4.2.6 Caking property: The sieve passing rate is preferably 90% or higher, most preferably 95% or higher. The test method is as follows. Using a filter paper (No. 2 manufactured by Advantec Co., Ltd.), a box without a cover with a length of 10.2 cm x a width of 6.2 cm x a height of 4 cm was fixed at the four corners with clamps. Put 50g of the sample in this box, and put the total weight of 15g+250g of acrylic resin plate and lead plate (or iron plate) on it. This was placed in a constant temperature and humidity apparatus at a temperature of 30° C., and the caking state was judged after 7 days or one month. Judgment is performed by obtaining the pass rate as follows. <pass rate>

The sample after the test is slowly placed on a sieve (opening 4760 μm specified in JIS Z 8801), and the weight of the passing powder is measured to obtain the passing rate (%) with respect to the weight of the total sample. 4.2.7 Permeability: Use two types of filter paper specified in JIS P 3801 (for example, "Qualitative No. 2 filter paper" manufactured by Toyo Filter Paper Co., Ltd.) to make a container with an upper opening of length × width × height = 10cm × 6cm × 4cm. A line with a width of 0.5 to 1.0 mm was drawn in a diagonal direction on the sample filling surface of the bottom surface of the container using an oil marker ("Magic InkM 700-T1" manufactured by Uchida Yoko Co., Ltd.). 100 g of the sample is filled in this container, and the total weight of an acrylic resin plate and a lead plate (or iron plate) is 15 g+250 g on it. This was put in a moisture-proof container, placed in a thermostat at a temperature of 30°C, and after 7 days, the state of immersion in the oily mark was visually judged, and the permeability was judged. Judgment criteria are as follows. Grade 5: The immersion width on the oily marker is 2 cm or more. Grade 4: The immersion width on the oily marker is 1 cm or more. Grade 3: The immersion width on the oily marker is 0.5 cm or more. Grade 2: Slight soaking is seen on oily marks. Grade 1: No maceration is visible on oily marks. 5. Preparation method of detergent particle swarm

The detergent particle group of this invention is manufactured by the process containing following process (a) - process (C).

Step (a): preparing a slurry containing a phosphate synergist, a water-soluble polymer, and water-soluble salts excluding the phosphate synergist, and dissolving the water-soluble components that are the water-soluble polymer and the water-soluble salts The process of 60% by weight or more of the slurry.

Step (b): a step of spray-drying the slurry obtained in step (a) to prepare matrix particle groups.

Step (c): a supporting step is performed after adding a surfactant to the base particle group obtained in step (b).

Furthermore, in order to further improve the physical properties of the obtained detergent particle group. Quality, it is preferable to add the surface modification step (d) after the step (c). Hereinafter, preferred aspects of each of the steps (a) to (c) and the surface modification step (d) will be described. 5.1 Process (a) (preparation process of slurry)

The slurry used in the present invention may be any slurry that can be pumped and is non-curable. In addition, the addition method of a component can also change suitably about order according to a case. The phosphate synergist (A) in the slurry is preferably 3 to 45% by weight, and the water-soluble polymer and phosphate-removed water-soluble components (B and C) in the slurry are preferably 1 to 15% by weight, respectively. and 3 to 40% by weight.

In addition, the temperature of the slurry is usually preferably 30 to 80°C. If the temperature of the slurry is within this range, it is preferable from the viewpoint of the solubility of the water-soluble polymer (B) and the liquid delivery by a pump.

As a method of forming a slurry, for example, initially, all or almost all of the water is added to a mixing tank, and it is preferable to add other ingredients sequentially or simultaneously after the water temperature reaches approximately the operating temperature. As a usual addition procedure, liquid components such as surfactant and polyacrylate are added first, and then water-soluble powder materials such as soda ash are added. In addition, small amounts of auxiliary components such as fluorescent dyes are also added. Finally, a phosphate synergist such as tripolyphosphate is added. At this time, in order to improve the mixing efficiency, the water-insoluble component may be divided and added two or more times. Alternatively, the powder raw materials may be mixed in advance and then added to the aqueous medium. In addition, after adding all the components, water may be added in order to adjust the viscosity and the water content of the slurry. After adding all the components to the slurry, mixing is preferably performed for at least 10 minutes, more preferably at least 30 minutes to obtain a homogeneous slurry. 5.2 Step (b) (adjustment step of matrix particle group)

As a drying method for the slurry, in order that the base particles can release the desired air bubbles and obtain the gradient structure of the components that are characteristic of the present invention, it is preferable to dry the slurry instantaneously, and it is particularly preferable to spray dry the particles into a substantially spherical shape. . As the spray drying tower, any form of a convective tower or a parallel flow tower may be used, but a convective tower is preferable from the standpoint of increasing the particle strength of the matrix particle group. As the atomization device for the slurry, any form of a pressurized spray nozzle, a two-fluid spray nozzle, or a rotating disk type can be used, but the average particle size of the base particle group is 150 to 500 μm, preferably 180 to 300 μm, so it is particularly preferable. is a pressure spray nozzle. The temperature of the high-temperature gas supplied to the drying tower is usually preferably 150 to 300°C, particularly preferably 170 to 250°C. In addition, the temperature of the gas discharged from the drying tower is usually preferably 70 to 125°C, particularly preferably 80 to 115°C. 5.3 Step (c) (Surfactant Supporting Step)

The method of supporting the surfactant of the base particle group can be performed using, for example, a batch type or continuous type mixer. In addition, in the batch method, the method of adding the base particle group and the surfactant to the mixer, for example, the following various methods can be used. Among them, methods (1) to (3) are carried out while operating the mixer.

(1) After adding the matrix particle group first in the mixer, add the surfactant. (2) Add matrix particle group and a small amount of surfactant into the mixer. (3) After adding a part of the base particle group to the mixer, add the remaining base particle group and surfactant in a small amount.

Among these methods, the above (1) is particularly preferred. In addition, it is preferable that the surfactant can be added in a liquid state, and it is more preferable to supply the surfactant in a liquid state by spraying.

Surfactants that exist in a solid or pasty form even when the temperature rises within a practical temperature range can be dispersed or dissolved in a low-viscosity nonionic surfactant or its aqueous solution or water to prepare a surfactant mixture. or an aqueous solution, and is added to the base particle group in the form of the mixed solution or aqueous solution. This method can easily add a solid or pasty surfactant to the base particle group, which is advantageous in producing a detergent particle group containing mononuclear detergent particles. The mixing ratio of the low-viscosity surfactant or water to the solid or pasty surfactant is preferably within the sprayable viscosity range of the resulting mixed liquid or aqueous solution. In general, since anionic surfactants (except acid precursors) are mostly in a solid state or a very high-viscosity paste state, it is best to prepare them so that they can be mixed with liquid nonionic surfactants and carried on the matrix particles. viscosity. From this point of view, the weight ratio of anionic surfactant/nonionic surfactant is preferably 4/1 to 1/3. A more preferred weight ratio of anionic surfactant/nonionic surfactant is 3/1˜1/2, most preferably 2/1˜1/1.5. For example, in the case of polyoxyethylene lauryl ether and sodium dodecylbenzenesulfonate, a sprayable surfactant mixture can be easily obtained by adjusting the ratio of the two in the range of 1:1.4 or less. In addition, when the content of the anionic surfactant is high, it is preferable to add components other than the surfactant as a viscosity reducer. Examples of the viscosity reducing agent include polyhydric alcohols such as polyethylene glycol having a molecular weight of 300 to 100,000, polypropylene glycol, a co-adduct of polyethylene glycol and polypropylene glycol, ethylene glycol, and glycerin.

The preparation method of the above-mentioned mixed solution, for example, can also be mixed by adding a solid or pasty surfactant to a low-viscosity surfactant or water, or using an alkali agent in a low-viscosity surfactant or water. (such as aqueous sodium hydroxide solution or aqueous potassium hydroxide solution) to neutralize the acid precursor of the surfactant to prepare a surfactant mixture.

In addition, in this step, the acid precursor of the anionic surfactant may be added before the addition of the surfactant, simultaneously with the addition, during the addition, or after the addition. By adding an acid precursor of an anionic surfactant, high compounding of surfactants, control of oil absorption capacity of matrix particles, suppression of bleed-out of non-particle surfactants of detergent particles, and improvement of fluidity can be achieved. · Quality improvement.

Examples of acid precursors of anionic surfactants usable in the present invention include alkylbenzenesulfonic acid, alkyl or alkenyl ether sulfuric acid, alkyl or alkenyl sulfuric acid, α-olefin sulfonic acid, α-sulfonated fatty acid , alkyl or alkenyl ether carboxylic acid, fatty acid, etc. In particular, it is preferable to add the fatty acid after addition of the surfactant, from the viewpoint of fluidity of the detergent particle group.

The amount of the acid precursor used is preferably 0.5 to 30 parts by weight, more preferably 1 to 20 parts by weight, based on 100 parts by weight of the base particle group. Within this range, since the mononuclear tendency of the particles in the detergent particle group can be maintained, favorable high-speed solubility is exhibited. In addition, as the method of adding the acid precursor of the anionic surfactant, it is preferably supplied by spraying if it is liquid at normal temperature, and it can be supplied in the form of powder if it is solid at normal temperature, or it can be supplied by spraying after melting. However, when adding in the form of powder, it is preferable to raise the temperature of the detergent particle group in the mixer to the temperature at which the powder melts.

As an apparatus preferably used in the step (c), there are Henschel mixer (manufactured by Mitsui Miike Chemical Machinery Co., Ltd.), high-speed mixer (manufactured by Fukae Kogyo Co., Ltd.), Vertical Granulator (manufactured by Powrex Co., Ltd.), L dige mixer (Matsuzaka Giken Co., Ltd.), PLOUGH SHARE mixer (manufactured by Pacific Machinery Co., Ltd.), Nauta mixer (manufactured by Hosokawa Co., Ltd.), etc. As a preferred mixer, from the viewpoint of manufacturing a detergent particle group containing a large amount of mononuclear detergent particles, it is preferably a device that is difficult to apply a strong shear force to the matrix particles (difficult to disintegrate the matrix particles). From the viewpoint of the dispersion efficiency of the surfactant, a device with high mixing efficiency is preferable. Among them, a mixing tank of a horizontal type is particularly preferred. There is a stirring shaft in the center of the cylinder, and a mixing blade is installed on the shaft to mix the powder (horizontal type mixing machine) L'dige mixer, PLOUGH SHARE mixer, etc. In addition, a continuous type apparatus using a mixer other than the above may be used to support the surfactant on the base particle group. In addition, as a continuous type apparatus of a mixer other than the above, there are, for example, a Fiexo Mix mixer (manufactured by Powrex Co., Ltd.), a TURBULIZER mixer (manufactured by Hosokawa Co., Ltd.), and the like.

As for the preferable mixing conditions, the Froude number of the main axis is preferably 0.5-8, and more preferably 0.5-4 from the viewpoint of suppression of disintegration of the matrix particles and mixing efficiency. Furthermore, when the mixer has a disintegrating leaf, the Froude number of the disintegrating leaf is preferably 200 or less, and it is more preferable that the disintegrating leaf is not substantially rotated.

In addition, in this process, when a nonionic surfactant is used, the melting point of the surfactant as a melting point raising agent is a water-soluble nonionic organic compound with a melting point of 45 to 100° C. and a molecular weight of 1,000 to 30,000 (hereinafter referred to as melting point). It is also possible that the aqueous solution may be added before, simultaneously with, during or after the addition of the surfactant, or pre-mixed after the surfactant. By adding a melting point raising agent, caking property and the bleed-out property of the surfactant in a detergent particle group can be suppressed. Examples of melting point raising agents include polyethylene glycol, polypropylene glycol, polyoxyethylene alkyl ethers, pluronic type nonionic surfactants, and the like.

The amount of the melting point raising agent used is preferably 0.5 to 5 parts by weight, more preferably 0.5 to 3 parts by weight, based on 100 parts by weight of the base particle group. Within this range, the mononuclearity of the particles in the detergent particle group, the high-speed solubility, and the inhibition of exudation and caking can be maintained. As the method of adding the melting point raising agent, the method of adding the melting point raising agent after mixing with the surfactant in advance or adding the melting point raising agent after the addition of the surfactant is advantageous for suppressing the exudation and caking of the detergent particle group. .

The temperature in the mixer is more preferably when the temperature is raised to the melting point or higher of the surfactant for mixing. Among them, as the temperature for raising the temperature, in order to promote the support of the surfactant, it is better to be higher than the pour point of the added surfactant, but when the actual operating range is given, it is higher than the pour point, 50°C higher than the pour point A temperature of 10°C to 30°C higher than the pour point is more preferred. In addition, the melting point of the surfactant is measured according to the method of JIS K 2269. When adding the acid precursor of the anionic surfactant in this step, it is more preferable to mix at a temperature at which the acid precursor of the anionic surfactant can react.

In order to obtain an appropriate batch-type mixing time of the detergent particle group and an average residence time of continuous mixing, it is preferably 1 to 20 minutes, more preferably 2 to 10 minutes.

In addition, when adding an aqueous solution of a surfactant or an aqueous solution of a water-soluble nonionic organic compound, a step of drying excess moisture may be provided during and/or after mixing.

It is also possible to add powdered surfactants and/or powder builders before, simultaneously with, during or after the addition of the surfactants. By adding a powder builder, the particle diameter of the detergent particle group can be controlled, and the detergency can be improved. In particular, when adding an acid precursor of an anionic surfactant, it is effective from the viewpoint of accelerating the neutralization reaction to add a powdery builder that exhibits alkalinity before adding the acid precursor. In addition, as a powder synergist, it refers to a powder detergency enhancer other than a surfactant, specifically a base agent with a metal ion capture agent such as zeolite, citrate, and tripolyphosphate, and sodium carbonate, potassium carbonate, etc. A base exhibiting alkalinity, a base having either metal ion capturing ability such as crystalline silicate or alkalinity, other bases capable of increasing ionic strength such as sodium sulfate, etc. The fine powder used in this step can be used after adjusting the particle size by pulverization or the like as necessary.

In addition, as a powder synergist, the 17th line of column 3 to the 24th line of column 6 of JP-A No. 5-279013 can be used (it is particularly preferred to be fired and crystallized at 500-1000° C.), JP-A-7-89712, line 45, column 2 to column 9, line 34, JP-A-60-227895, line 18, page 2, lower right column, line 18, page 4, upper right column, line 3 (particularly preferred is the silicate in Table 2.) The crystalline silicate described. Here, SiO ₂ /M ₂ O (where M represents an alkali metal) of the alkali metal silicate is suitably 0.5 to 3.2, preferably 1.5 to 2.6.

The amount of powder synergist used is preferably 0.5 to 12 parts by weight, most preferably 1 to 6 parts by weight, based on 100 parts by weight of the base particle group. In this range, the mononuclearity of the detergent particles contained in the detergent particle group is maintained, excellent high-speed solubility is obtained, and the control of the particle diameter is also suitable. 5.4 Process (d) (surface modification process)

In the present invention, the surface modification step of adding a surface coating agent such as (1) fine powder or (2) liquid may be repeated in one step or two steps.

From the viewpoint of improving the fluidity and non-caking properties of the detergent particle group, it is preferable to have a surface modification step. The apparatus used in the surface modification step is not particularly limited, but the mixer exemplified in the above step (c) is preferable. Hereinafter, the surface coating agents will be described respectively.

(1) micropowder

The average particle diameter of the primary particles is preferably 10 μm or less, most preferably 0.1 to 10 μm. In this range, it is preferable from the viewpoint of improving the coverage rate of the particle surface of the detergent particle group and improving the fluidity and blocking resistance of the detergent particle group. The average particle diameter is measured by a method utilizing light scattering, for example, a particle analyzer (manufactured by Koba Seisakusho Co., Ltd.), observation and measurement with a microscope, and the like. In addition, the fine powder has high ion exchange capacity and high alkalinity, and is ideal for cleaning.

As the fine powder, crystalline or amorphous aluminosilicate is preferable. In addition, fine powders of silicate compounds such as sodium tripolyphosphate, sodium sulfate, calcium silicate, silica, bentonite, talc, clay, amorphous silica derivatives, crystalline silicate compounds, etc. ideal. The particle size of the fine powder used in the surface modification step is adjusted by pulverization or the like as necessary. When tripolyphosphate and sodium sulfate are used as fine powders in the surface modification step, and no water-insoluble builder is used in the base particles, the detergent particle group dissolves to become transparent to translucent during washing. In this case, hand washing is suitable because it is easy to know the state of decontamination. In the detergent particle group, metal bases with primary particles of 0.1 to 10 μm, powdery surfactants (for example, alkyl sulfates, etc.) or water-soluble organic salts may be used together. In addition, when using a crystalline silicate compound, it is preferable to mix it with a fine powder other than the crystalline silicate compound for the purpose of preventing deterioration of the crystalline silicate due to moisture absorption or carbon dioxide absorption. use.

The amount of fine powder used is preferably 0.5 to 40 parts by weight, more preferably 1 to 30 parts by weight, and most preferably 2 to 20 parts by weight with respect to 100 parts by weight of the detergent particle group. In this range, the fluidity is improved, and an excellent usability is given to consumers.

(2) Liquid

Examples of liquids include aqueous solutions and melts of water-soluble polymers, fatty acids, and the like. (2-1) Water-soluble polymer

Examples of the water-soluble polymer include polycarboxylates such as carboxymethylcellulose, polyethylene glycol, sodium polyacrylate, copolymers of acrylic acid and maleic acid, or salts thereof. The usage-amount of this water-soluble polymer is preferably 0.5-10 weight part with respect to 100 weight part of detergent particle groups, More preferably, it is 1-8 weight part, Most preferably, it is 2-6 weight part. Within this range, the mononuclearity of the detergent particles contained in the particle group can be maintained, and a powder with good fluidity and anti-caking property can be obtained while obtaining high-speed solubility. (2-2) fatty acid

Examples of the fatty acid include fatty acids having 10 to 22 carbon atoms, and the like. The usage-amount of this fatty acid is preferably 0.5-5 weight part with respect to 100 weight part of detergent particle groups, More preferably, it is 0.5-3 weight part. When it is a solid at normal temperature, it is better to supply it in the form of a spray after heating to a temperature showing fluidity.

In addition, the contents of the phosphate builder, anionic surfactant, and nonionic surfactant in the detergent particle group are as follows.

The content of the phosphate synergist is preferably 5 to 50% by weight, more preferably 7 to 40% by weight, most preferably 9 to 35% by weight. In addition, the content of the anionic surfactant is preferably 5 to 40% by weight, more preferably 6 to 35% by weight, and most preferably 7 to 35% by weight. The content of the nonionic surfactant is preferably 1 to 30% by weight, more preferably 1 to 25% by weight, most preferably 1 to 20% by weight.

Here, the above-mentioned components represent the sum of the amounts used in one or more steps from the steps (a) to (d). 6. Detergent particle group containing multinuclear detergent particles

The detergent particle group of the present invention may contain multinuclear detergent particles. Multinuclear detergent particles, that is, agglomerated by the matrix particles constituting the above-mentioned single-nuclear detergent particles, or formed after condensation of water-soluble salts such as sodium carbonate, etc., are all possible, as long as they can be It is enough to emit bubbles of the specified size. In particular, by using the above-mentioned base particles, the gradient property of the base particles can be obtained, and the high-speed solubility can be further improved. Therefore, as the base particles, the base particles in the above-mentioned mononuclear detergent particles can be used, and the surfactant that can be carried on the base particles can also be the surfactant in the above-mentioned mononuclear detergent particles. In addition, multinuclear detergent particles can be easily formed by increasing the amount of the surfactant. In addition, the use of a foaming agent such as sodium bicarbonate or percarbonate can also accelerate the dissolution promotion between the matrix particles. 7. Physical Properties of Detergent Particle Group Containing Multinuclear Detergent Particles

The multinuclear detergent particle group of the present invention exhibits the same high dissolution rate as the detergent particle group containing mononuclear detergent particles, and has higher solubility than conventional detergents. The high-speed solubility of the detergent particle group can be confirmed by the above-mentioned method of item 4.2.2.

In addition, with regard to bulk density, average particle size, fluidity, caking property and oozing property, it is best to show the detergent particle group containing mononuclear detergent particles in items 4.2.3 to 4.2.7. The same physical properties of the case. 8. Detergent composition

The detergent composition of the present invention is composed of (a): detergent particle group containing mononuclear detergent particles and/or multinuclear detergent particles and (b): detergent components added in addition to the above-mentioned (a) component constituted.

In this case, the detergent composition contains the above-mentioned detergent particle group in an amount of 50% by weight or more, preferably 60% by weight or more, more preferably 80% by weight or more of the detergent composition.

In such a detergent composition, when the detergent composition is dissolved in water, bubbles with a diameter of more than 1/10 of the particle diameter constituting the particles of the detergent composition are released from the inside, and the particles constituting the detergent composition It constitutes 40% by weight or more, more preferably 60% by weight or more, and most preferably 80% by weight or more of the particles of the entire composition.

The detergent composition of the present invention has high-speed solubility, and its high-speed solubility can be confirmed by the method described in the above item 4.2.2 (in this case, replace "detergent particle group" with "detergent composition") .

Modulation of Example Matrix Particles

Substrate particle group I was produced in the following steps.

Add 664kg of water into a ^1m3 mixing tank with stirring blades, and after the water temperature reaches 55°C, add 57kg of sodium carbonate, 28kg of sodium sulfate, 6.2kg of sodium sulfite, 2.1kg of dyes, etc., stir for 15 minutes, and then add 40% by weight 70kg of sodium polyacrylate aqueous solution. After stirring for 15 minutes and further stirring for 15 minutes, 277 kg of sodium tripolyphosphate was added, and after stirring for 30 minutes, a homogeneous slurry was obtained. The final temperature of the slurry was 58°C. In addition, the water content of this slurry was 64% by weight.

This slurry was sprayed at a spray pressure of 25 kg/cm ² from a pressure spray nozzle installed near the top of the spray drying tower to obtain a base particle group 1 . The high-temperature gas supplied to the spray drying tower was supplied at a temperature of 225°C from the lower part of the tower, and was discharged at a temperature of 105°C from the top of the tower. Base particle groups 2 to 4 were produced in the same manner. The composition and physical properties of each matrix particle group are shown in Table 1. As for the matrix particle group 4, when observed by SEM, pores whose pore diameter was 1/10 to 4/5 or more of the particle diameter were observed in 80% or more of the particles. Furthermore, when observed by FT-IR/PAS, SEM, and EDS analysis, it can also be confirmed that the ratio of tripolyphosphate inside the particles is high, and the water-soluble polymers and water-soluble salts are mostly present near the surface of the particles. particle structure. Table 1 matrix particle group 1 2 3 4 Matrix particle composition︵wt%︶ Component A Sodium tripolyphosphate ^*1 67.4 43.5 34 18 ingredient B Sodium polyacrylate ^*2 6.9 7 6.7 8 Acrylic acid/maleic acid copolymer ^*3 2 2 Component C Sodium carbonate ^*4 13.9 15 14 17 sodium sulfate 6.9 7 6.7 5 Sulfite 1.5 1.5 1.5 1.5 other Sodium dodecylbenzenesulfonate ^*5 4 2 Supplementary ingredients (dyes, etc.) ^*6 0.5 0.5 0.5 0.5 Zeolite ^*7 15 31 44 water 2.9 4.5 3.6 4 Serous formation 100 100 100 100 Water of aqueous slurry (weight %) 64 57 42 38 spray drying Supply air temperature (℃) 225 226 232 230 Exhaust gas temperature (℃) 105 104 110 107 Spray pressure (kg/cm ² ) 25 25 25 25 Matrix particle group properties Bulk density (g/L) 630 615 650 670 Average particle size (μm) 250 270 235 220 Particle strength (kg/cm ² ) 280 260 240 290 Carrying capacity (ml/100g) 48 43 54 65 Moisture content (weight%) 5 3.1 6 3.3 *1): Central Glass Co., Ltd. *2): Average molecular weight 10,000 *3): BASF Sokalan cp5 *4): DENSE ash (Central Glass Co., Ltd.) *5): NEOPELEX F65 (Kao Co., Ltd. ))*6): fluorescent dye Tinopal CBS-X (Ciba Specialty

Chemicals Co., Ltd.) *7): Zeolite 4A type, average particle diameter 3.5 μm (Tosoh Co., Ltd.) Example 1

Surfactant was added and supported in the ratio shown in Table 2 to the base particle group 1, and the detergent particle group of this invention was obtained.

12 parts by weight of anionic active agent shown in Table 2, 10 parts by weight of nonionic surfactant, 1 part by weight of polyethylene glycol, and 0.5 part by weight of palmitic acid were heated to 80°C. Next, 100 parts by weight of the above-mentioned base particle group was put into a L'dige mixer (manufactured by Matsuzaka Giken Co., Ltd., capacity 20 L, jacketed), and stirring was started with the main shaft: 60 rpm and the pulverizer: stopped. In addition, warm water at 80° C. was flowed through the jacket at 10 L/min. Here, the above-mentioned nonionic surfactant was charged over 2 minutes, stirred for 4 minutes, and discharged. Table 2 shows the physical properties of the obtained detergent particle group. Table 2 Example 1 2 3 4 5 6 Composition︵Parts by weight︶ Substrate particle group number (use amount: parts by weight) 1 2 3 3 4 3 nonionic surfactant Polyoxyethylene alkyl ether ^*1 10 twenty two 10 20 10 16 anionic surfactant LAS-Na ^*2 12 12 12 21.5 Acid precursors of anionic surfactants LAS-acid type ^*3 10 Palmitic acid ^*4 0.5 0.5 0.5 0.5 0.5 1.3 Melting point raiser for nonionic surfactants Polyethylene glycol ^*5 1 2 1 1 1 1.6 Surface coating agent (fine powder) Crystalline aluminosilicate ^*6 10 12 3 4 Amorphous aluminosilicate ^*7 8 Sodium tripolyphosphate ^*8 16 13 25.6 Crystalline phyllosilicate ^*10 6 physical properties Average particle size [μm] 255 265 270 245 260 283 Particle growth length 1.02 1.06 1.08 1.61 1.04 1.08 Bulk density [g/L] 680 690 660 610 690 685 Liquidity [sec] 6.9 7.2 7.8 6.5 6.8 7.7 Dissolution rate within 60 seconds [%] 98.4 99.1 98.1 97.8 99.1 98.4 SEM observation of cut surface Mononuclearity multi-core Mononuclearity Mononuclearity Hand wash solubility [sec] 47 37 48 51 41 44 *1): EMULGEN 108KM average added moles of ethylene oxide = 8.5 (Kao Co., Ltd.

Manufactured)*2): NEOPELEX F65 (straight-chain alkyl (10-13 carbon atoms) sodium benzenesulfonate)

(manufactured by Kao Co., Ltd.)*3): NEOPELEX F S (linear alkyl (10-13 carbon atoms) benzenesulfonic acid) (flower

Wang Co., Ltd.) *4): LUNAC P-95 (Kao Co., Ltd.) *5): K-PEG 6000 Average molecular weight 8500 (Kao Co., Ltd.) *6): Zeolite 4A type Average particle size 3.5 μm (manufactured by Tosoh Co., Ltd.)

*7): Average particle size 8 μm as described in Production Example 2 of JP-A-9-132794

*8): Particle group classified between 125μm and 180μm meshes

*9): Grind the sodium tripolyphosphate in Table 1 to an average particle size of 6 μm

*10): Grind SKS-6 manufactured by Ciariant Tokuyama K.K. to an average size

6μm in diameter

Furthermore, the surface of the detergent particle group was coated with 10 parts by weight of crystalline aluminosilicate under the conditions of spindle: 150rpm and pulverizer: 5000rpm, and the physical properties of the obtained detergent particle group maintained the dissolution Sex, mobility has been improved.

Example 2

The surfactant solution which previously mixed the polyethylene glycol described in Table 2 was added to the base particle group 2, and the detergent particle group of this invention was obtained.

A solution of 22 parts by weight of the nonionic surfactant described in Table 2 and 2 parts by weight of polyethylene glycol was heated and mixed at 70° C. to prepare a liquid mixture. Next, 100 parts by weight of the above-mentioned base particle group was put into the same mixer as in Example 1, and stirring was started under the conditions that the main shaft: 60 rpm and the pulverizer were stopped. In addition, warm water at 75° C. was flowed into the jacket at 10 liters/minute. The above mixed solution was added thereto over 2 minutes, followed by stirring for 4 minutes. And then change the stirring condition to the main shaft: 150rpm and pulverizer: under the condition of 5000rpm, on the particle surface of this detergent particle group, carry out surface treatment with 12 parts by weight of crystalline aluminosilicate and 6 parts by weight of crystalline silicate. Table 2 shows the physical properties of the detergent particles obtained after coating.

By blending polyethylene glycol, the blocking resistance of the detergent particle group is further improved, and the bleed-out of the nonionic surfactant is further suppressed.

Example 3

To the base particle group 3, a surfactant was added at the ratio described in Table 2 same as in Example 1 to obtain the detergent particle group of the present invention. In Example 3, the surface of the detergent particle group was surface-coated with 16% pulverized sodium tripolyphosphate. Table 2 shows the physical properties of the obtained detergent particle group.

As a result of measuring the hollowness of the detergent particle group, it was shown that 65% of the particles had pores whose pore diameter was 1/10 to 4/5 of the particle diameter.

Furthermore, the dissolution behavior of the detergent particle group was observed with a digital microdetector, and as a result, it was confirmed that bubbles with a diameter of 1/10 or more of the particle diameter were released from 63% of the particles (in addition, the bubble diameter/particle size was released from the above-mentioned 63% particles). The average diameter is 1.7/5).

Example 4

As the base particle group, the sieved base particle group 3 was used, and the base particle group was classified between 125 μm and 180 μm sieve openings. Furthermore, as an addition method of anionic surfactant, the acid precursor of anionic surfactant is used, and after adding the nonionic surfactant which does not mix with this acid precursor into a mixer, add anionic surfactant to a mixer. The acid precursor of the active agent (dodecylbenzenesulfonic acid) yields the detergent particle population of the present invention.

Next, in the same manner as in Example 1, 100 parts by weight of the above-mentioned base particle group was added to the mixer, and stirring was started under the conditions of a main shaft: 150 rpm and a pulverizer: 4000 rpm. In addition, warm water at 60° C. was flowed into the jacket at a rate of 10/liter. The above mixed solution was added thereto over 2 minutes, followed by stirring for 3 minutes. Next, 10.5 parts by weight of an acid precursor of an anionic surfactant heated to 45° C. was added over 2 minutes, followed by stirring for 4 minutes. Furthermore, the particle surface of the detergent particle group was surface-coated with 8 parts by weight of amorphous aluminosilicate and 3 parts by weight of crystalline sodium aluminosilicate, and the physical properties of the obtained detergent particle group were shown in Table 2. middle.

Example 5

The detergent particle group of this invention was obtained by adding the surfactant etc. of the ratio shown in Table 2 to the base particle group 4. Detergent particle groups were obtained in the same manner as in Example 1, except that 13 parts of pulverized sodium tripolyphosphate and crystalline sodium aluminosilicate were used for the surface of the detergent particle group.

As a result of measuring the hollowness of the detergent particle group, 85% of the particles had pores whose pore diameter was 1/10 to 4/5 of the particle diameter.

Furthermore, the dissolution behavior of the detergent particle group was observed, and as a result, it was confirmed that bubbles with a diameter of 1/10 or more of the particle diameter were released from 83% of the particles (the average value of the bubble diameter/particle diameter released from the above-mentioned 83% particles was 2.8 /5).

Example 6

The detergent particle group of this invention was obtained by adding surfactant etc. to the base particle group 3 by the ratio shown in Table 2 similarly to Example 1. In Example 6, the particle surface of the detergent particle group was coated with 25.6 parts by weight of pulverized sodium tripolyphosphate. Table 2 shows the physical properties of the obtained detergent particle group.

In addition, as a result of measuring the hollowness of the detergent particle group, 60% of the particles had pores whose pore diameter was 1/10 to 4/5 of the particle diameter.

Furthermore, the dissolution behavior of the detergent particle group was observed with a digital microscope, and as a result, it was confirmed that bubbles with a diameter of 1/10 or more of the particle diameter were released from 61% of the particles (bubble diameter/particle diameter released from the above-mentioned 61% particles) The average is 1.7/5).

Embodiment 7～8

Enzyme granules were added to the detergent particle group of Example 4 at the ratio described in Table 3 to obtain the detergent composition of the present invention. Table 3 shows the physical properties of the obtained detergent composition. In addition, the enzyme of the enzyme granule in Table 3 is Savinase 18T type W manufactured by NOVO Corporation.

table 3 Example 7 Example 8 composition Detergent particle swarm 100 parts (embodiment 4) 100 parts (embodiment 5) Enzyme Granules 2 copies 4 parts physical properties Average particle size [μm] 250 265 Bulk density [g/L] 620 700 Dissolution rate within 60 seconds [%] 97 98 Dissolution rate within 30 seconds [%] 86 92

The results in Table 3 show that the detergent compositions obtained in Examples 7 to 8 are all detergent compositions excellent in solubility. Test example 1

Table 4 shows the results obtained for particle solubility and hand washing solubility of eight representative detergent compositions sold or sold in Asia, Europe, and the United States. The results from Table 4 show that these commercially available detergents are at the level of low particle solubility and also poor hand wash solubility. Moreover, among the commercially available detergents A to H, fluidity was also remarkably inferior to A which was excellent in particle solubility and hand-washing solubility. Table 4 Dissolution rate within 60 seconds [%] Hand washing dissolution time [seconds] Asia Commercial detergent A ¹⁾ 84.1 111 Commercial Detergent B 77.6 135 commercially available detergent C 67.2 152 Commercial detergent D 70.9 130 Europe Commercial Detergent E 72.1 121 Commercial Detergent F 74.4 141 North America Commercial Detergent G 57.6 164 Commercial Detergent H 58.0 156 1) Bulk density 560 g/L In measuring fluidity, the fluidity was so low that almost 100 mL of powder could not flow out from the hopper for bulk density measurement.

Industrial availability

The detergent composition of the present invention has excellent detergency even when the workload of the washing machine is low, and has excellent fluidity, particle solubility and dispersibility for easy hand washing.

In the present invention described above, it is obvious that there are multiple ranges of identity. With regard to such diversity, as long as they do not deviate from the intention and scope of the present invention, all changes that are considered obvious to those skilled in the art are also included in the technical scope of the scope of the following claims.

Claims (10)

1. A detergent particle group, which is a detergent particle group containing a phosphate builder, and is a detergent particle group with an average particle diameter of 150 to 500 μm, a bulk density of 500 g/L or more, and a flow time of 10 seconds or less, the Detergent particle group, which contains detergent particles that can emit air bubbles with a diameter of 1/10 or more of the particle diameter from the inside of the particle during the process of dissolving in water, and the detergent particle group is put into water at 5°C and used Detergent particles whose dissolution rate of detergent particles calculated by formula (1) is 90% or more when fed to a standard sieve (opening 74 μm) specified in JIS Z 8801 after stirring for 60 seconds under the stirring conditions shown below, Stirring conditions: 1 g of the detergent particle group was dropped into 1 liter of hard water (71.2 mg CaCO ₃ /L, Ca/Mg molar ratio 7/3), and a stirring bar (length 35 mm, diameter 8mm) for stirring, rotating speed 800rpm Dissolution rate (%)={1-(T/S)}×100 (1) S: input weight of detergent particle group (g) T: When the aqueous solution obtained under the above-mentioned stirring conditions is supplied to the above-mentioned sieve, the dry weight of the dissolved residue of the detergent particle group remaining on the sieve. 2. The detergent particle group according to claim 1, wherein the detergent particle group is a matrix particle containing a phosphate synergist, a water-soluble polymer, and a water-soluble salt for removing the phosphate synergist. A detergent particle group composed of a detergent, the base particles have a gradient property in which more water-soluble polymers exist near the surface than inside. 3. A detergent particle group, which is a detergent particle group containing a phosphate builder, and is a detergent particle group with an average particle diameter of 150 to 500 μm, a bulk density of 500 g/L or more, and a flow time of 10 seconds or less, the Detergent particle group is a detergent particle group composed of substrate particles containing a phosphate synergist, a water-soluble polymer, and a water-soluble salt that removes a phosphate synergist. The substrate particle has a In its structure, there are more gradients of water-soluble polymers near the surface than inside, and the detergent particle group is put into water at 5°C and stirred for 60 seconds using the stirring conditions shown below, and then supplied to the JIS Z8801 specified Detergent particles whose dissolution rate of the detergent particles calculated by formula (1) is 90% or more in a standard sieve (opening 74 μm), Stirring conditions: 1 g of the detergent particle group was dropped into 1 liter of hard water (71.2 mg CaCO ₃ /L, Ca/Mg molar ratio 7/3), and a stirring bar (length 35 mm, diameter 8mm) for stirring, rotating speed 800rpm, Dissolution rate (%)={1-(T/S)}×100 (1) S: input weight of detergent particle group (g) T: When the aqueous solution obtained under the above-mentioned stirring conditions is supplied to the above-mentioned sieve, the dry weight of the dissolved residue of the detergent particle group remaining on the sieve. 4. The detergent particle group according to claim 2 or 3, wherein relative to 100 parts by weight of base particles containing 5 to 90 parts by weight of a phosphate synergist, the amount of the anionic surfactant is 1 to 60 parts by weight. parts by weight, and the loading amount of the nonionic surfactant is 1-45 parts by weight. 5. The detergent particle group according to any one of claims 2 to 4, wherein the compounding amount of the water-soluble polymer in the base particles is 2% by weight or more, and the compounding amount of the amorphous silicate is not to 3% by weight. 6. The detergent particle group according to any one of claims 1 to 5, wherein the weight ratio of anionic surfactant/nonionic surfactant is 4/1 to 1/3. 7. The detergent particle group according to any one of claims 1 to 6, wherein the particle group has pores having a diameter of 1/10 to 4/5 of the particle diameter inside. 8. The detergent particle group according to any one of claims 1 to 7, wherein the detergent particle group contains mononuclear detergent particles. 9. A method for producing the detergent particle group according to any one of claims 1 to 8, which comprises the following steps: Step (a): preparing a slurry containing a phosphate synergist, a water-soluble polymer, and a water-soluble salt that removes the phosphate synergist, and the water-soluble polymer and the water-soluble salt of the water-soluble component The process of dissolving the slurry of 60% by weight or more, Step (b): a step of spray-drying the slurry obtained in step (a) to prepare a matrix particle group, Step (c): A step of adding and supporting a surfactant to the base particle group obtained in step (b). A detergent composition comprising at least 50% by weight of the detergent particle group according to any one of claims 1 to 8.