Foaming detergent

Abstract

An object of the present invention is to provide a foaming detergent which foams in a large amount and which can suppress a decrease in the foaming amount at low water temperatures. The present invention relates to a composition comprising (A) an acid, (B) a bicarbonate, and (C) a surfactant, and the bicarbonate When a cleaning composition using particles having a size of less than 180 μm is contained in a water-soluble packaging material and the composition is immersed in water while still contained in the water-soluble packaging material, a large amount of foaming occurs, and furthermore, a decrease in the amount of foaming can be suppressed even at low water temperatures.

Description

Technical Field

[0001] The present invention relates to a foaming detergent. More specifically, the present invention relates to a foaming detergent that has a large amount of foam and can suppress a decrease in the amount of foam at low water temperatures.

Background Art

[0002] Powdery foaming detergents containing a foaming agent can exhibit excellent cleaning effects due to the interaction between the chemical cleaning power of surfactants and the physical cleaning power of the foaming action. Therefore, they are widely used for cleaning toilets, drain pipes, sinks, washing machines, toilets, bathtubs, etc.

[0003] Conventionally, various studies have been conducted on powdery foaming detergents, and powdery foaming detergents with various compositions have been proposed. For example, Patent Document 1 reports that a foaming powder detergent composition containing an inorganic carbonate, a water-soluble solid acid, and inorganic sodium sulfate particles, where 85% by mass or more of the inorganic sodium sulfate particles can pass through a sieve with a mesh size of 150 μm, and the content ratio of the inorganic carbonate to the water-soluble solid acid is in the range of 4:1 to 1:3 by mass ratio, has excellent foaming properties and storage stability.

[0004] When such a powdery foaming detergent is immersed in water, an acid and a carbonate compound react to generate foam, exerting a physical cleaning action and also a chemical cleaning action by the surfactant. Therefore, there is no need for special scrubbing, it is hygienic and has excellent convenience, and is widely accepted by consumers.

[0005] However, conventional powdery foaming detergents have the drawback that when immersed in water, a part floats on the water surface and rides on the foam during foaming (dissolving), so that a sufficient amount of foam cannot be obtained.

[0006] Furthermore, since the water temperature of toilet flushing water changes with the seasons, powdered foaming detergents are required to maintain consistent cleaning power regardless of water temperature. However, conventional powdered foaming detergents have the drawback of reduced foaming when the immersion water temperature is low. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2007-377312 [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] The objective of the present invention is to provide a foaming detergent that produces a large amount of foam and suppresses the decrease in foam production at low water temperatures. [Means for solving the problem]

[0009] The inventors of the present invention have conducted diligent studies to solve the above problems and have found that the present invention comprises (A) an acid, (B) a bicarbonate, and (C) a surfactant, and the proportion of the bicarbonate is less than 180 μm. We found that when a cleaning composition containing 30% or more of the active ingredient is placed in a water-soluble packaging material and then immersed in water while still in the packaging, a large amount of foam is produced, and the decrease in foam production is suppressed even at low water temperatures. This invention was completed by further investigation based on these findings.

[0010] In other words, the present invention provides inventions in the following embodiments. Item 1. The cleaning composition is contained in a water-soluble packaging material. The cleaning composition contains (A) an acid, (B) a bicarbonate, and (C) a surfactant, and A foaming detergent in which particles smaller than 180 μm account for 30% by weight or more of the bicarbonate. Item 2. The foaming detergent according to Item 1, wherein the proportion of particles measuring 45 μm or more and less than 180 μm in size of the bicarbonate is 50% by weight or more. Item 3. The foaming detergent according to item 1 or 2, wherein the proportion of particles smaller than 106 μm in size of the bicarbonate is 80% by weight or more. Item 4. The foaming detergent according to any one of items 1 to 3, wherein the bicarbonate is sodium bicarbonate. Item 5. A foaming detergent according to any one of items 1 to 4, wherein the acid is an organic acid. Item 6. The foaming cleaning agent according to any one of items 1 to 5, wherein the cleaning composition further comprises a bleaching agent. Item 7. A foaming cleaning agent for cleaning toilet bowls, as described in any of items 1 to 6. Item 8. A cleaning method comprising immersing an object to be cleaned in water with a foaming cleaning agent described in any of Items 1 to 7. [Effects of the Invention]

[0011] The foaming detergent of the present invention exhibits a large amount of foam and improved foaming properties when immersed in water, thus providing excellent cleaning effects. Furthermore, even when immersed in low-temperature water (around 5°C), the foaming detergent of the present invention exhibits a large amount of foam and suppresses a decrease in foaming properties, resulting in less variation in cleaning effectiveness depending on water temperature and providing stable cleaning effects throughout the year. [Brief explanation of the drawing]

[0012] [Figure 1] This figure shows the results of observing the degree of foaming after 3 minutes and 5 minutes, when a foaming detergent (Example 1) and a cleaning composition (Comparative Example 1) were poured into a toilet bowl in Test Example 1. [Modes for carrying out the invention]

[0013] The foaming detergent of the present invention is such that the cleaning composition is contained in a water-soluble packaging material, and the cleaning composition contains (A) an acid, (B) a hydrogen carbonate, and (C) a surfactant, and the proportion of particles less than 180 μm in the hydrogen carbonate is 30% by weight or more. Hereinafter, the foaming detergent of the present invention will be described in detail.

[0014] [Powder cleaning composition] The foaming detergent of the present invention includes, as a cleaning composition, a cleaning composition containing (A) an acid, (B) a hydrogen carbonate showing a specific particle size distribution, and (C) a surfactant. Hereinafter, the cleaning composition will be described.

[0015] (A) Acid The cleaning composition used in the present invention contains an acid (sometimes referred to as “component (A)”) as a component that reacts with component (B) described below in the presence of water to generate carbon dioxide gas.

[0016] The acid may be in either solid or liquid form, but preferably solid form. Also, the acid may be either an organic acid or an inorganic acid, but preferably an organic acid.

[0017] Specific examples of the acid include organic acids such as citric acid, tartaric acid, fumaric acid, malic acid, maleic acid, gluconic acid, succinic acid, and salicylic acid; and inorganic acids such as phosphoric acid, sulfamic acid, sulfuric acid, nitric acid, and hydrochloric acid.

[0018] Among these acids, preferably a solid organic acid, more preferably citric acid.

[0019] These acids may be used alone or in combination of two or more.

[0020] The content of component (A) in the cleaning composition can be appropriately set according to the amount of foaming, the content of component (B) described later, the amount of cleaning composition contained in the water-soluble packaging, etc., but for example, 5 to 70% by weight, preferably 15 to 60% by weight, more preferably 20 to 50% by weight, and particularly preferably 30 to 45% by weight.

[0021] (B) Bicarbonate The cleaning composition used in the present invention contains a bicarbonate (sometimes referred to as "component (B)") exhibiting a specific particle size distribution as a component that reacts with component (A) in the presence of water to generate carbon dioxide.

[0022] The bicarbonate can be water-soluble and is not particularly limited in type as long as it can react with component (A) in the presence of water to generate carbon dioxide. Examples include alkali metal salts of bicarbonate such as sodium bicarbonate and potassium bicarbonate.

[0023] Among these bicarbonates, sodium bicarbonate is preferred from the viewpoint of increasing the amount of effervescence while more effectively suppressing the decrease in effervescence at low water temperatures.

[0024] These bicarbonates may be used individually or in combination of two or more types.

[0025] In this invention, the bicarbonate used is one in which particles smaller than 180 μm account for 30% by weight or more of the total bicarbonate particles. In this invention, by using a bicarbonate having such a specific particle size distribution and encapsulating the cleaning composition in a water-soluble packaging material, it is possible to increase the amount of foam and suppress the decrease in the amount of foam even at low water temperatures. From the viewpoint of further increasing the amount of foam while more effectively suppressing the decrease in the amount of foam at low water temperatures, the proportion of particles smaller than 180 μm in the bicarbonate is 30 to 100% by weight, preferably 50 to 100% by weight, more preferably 70 to 100% by weight, and particularly preferably 80 to 100% by weight.

[0026] Furthermore, one preferred embodiment of the bicarbonate used in the present invention is that, of the total bicarbonate particles, particles measuring 45 μm or more and less than 180 μm account for 50% by weight or more, preferably 60 to 90% by weight, and more preferably 70 to 85% by weight. Furthermore, another preferred embodiment of the bicarbonate used in the present invention is that, of the total bicarbonate particles, particles measuring 63 μm or more and less than 180 μm account for 40% by weight or more, preferably 50 to 90% by weight, more preferably 55 to 85% by weight, and particularly preferably 70 to 85% by weight. Furthermore, another preferred embodiment of the bicarbonate used in the present invention is that, of the total bicarbonate particles, particles measuring 75 μm or more and less than 180 μm account for 20% by weight or more, preferably 30 to 90% by weight, and more preferably 35 to 85% by weight. By employing a bicarbonate having such a particle size distribution, it becomes possible to more effectively increase the amount of foaming and suppress the decrease in the amount of foaming at low water temperatures.

[0027] Furthermore, one particularly preferred embodiment of the bicarbonate used in the present invention is one in which particles smaller than 106 μm account for 80% or more by weight, preferably 85-99% by weight, and more preferably 90-98% by weight, of the total bicarbonate particles. By employing a bicarbonate having such a particle size distribution, it becomes possible to significantly increase the amount of foaming and suppress the decrease in the amount of foaming at low water temperatures.

[0028] In this invention, the particle size distribution of bicarbonate is determined according to the "mechanical sieving" method of the "dry sieving test method" specified in JIS 0069:1992 "Test method for sieving chemical products". Specifically, first, sieves with mesh sizes of 500 μm, 250 μm, 180 μm, 150 μm, 106 μm, 75 μm, 63 μm, and 45 μm are prepared and stacked on a tray with the smaller mesh sizes on the bottom and the larger mesh sizes on the top. Next, the sample is placed in the top sieve and the lid is closed. Then, vibration is applied using a vibrator to perform sieving. After sieving is complete, the particle size distribution described above is determined by measuring the mass above and below each sieve.

[0029] Furthermore, the average particle size of the bicarbonate used in the present invention is not particularly limited as long as it has the above-mentioned particle size distribution, but for example, it can be 200 μm or less, preferably 40 to 180 μm, and more preferably 50 to 150 μm.

[0030] Furthermore, in the present invention, the average particle size of the bicarbonate is the cumulative 50% value on a weight basis calculated from the particle size distribution obtained in accordance with the "mechanical sieving" method of the "dry sieving test method" specified in JIS 0069:1992 "Sieving test method for chemical products". Specifically, first, the mass above and below the sieve at each stage is determined by the sieving test, the sieving residue (%) is calculated according to the calculation formula below, and then the average particle size can be calculated using the said sieving residue (%) according to the calculation formula below.

number

[0031] The content of component (B) in the cleaning composition can be appropriately set according to the amount of foaming, the content of component (A), the amount of cleaning composition contained in the water-soluble packaging, etc., but for example, 20 to 80% by weight, preferably 30 to 60% by weight, and more preferably 40 to 55% by weight are given.

[0032] Furthermore, in the cleaning composition, the ratio of component (A) to (B) is not particularly limited, as long as it is within the range corresponding to the respective contents. For example, per 100 parts by weight of component (A), component (B) may be 25 to 1600 parts by weight, preferably 60 to 300 parts by weight, and more preferably 80 to 200 parts by weight.

[0033] (C) Surfactants The cleaning composition used in this invention contains a surfactant (sometimes referred to as "component (C)") in order to provide cleaning power through surfactant action.

[0034] The type of surfactant is not particularly limited, as long as it is usable as an ingredient in a detergent, and any of anionic surfactants, nonionic surfactants, cationic surfactants, and amphoteric surfactants may be used.

[0035] Examples of anionic surfactants include alkylbenzene sulfonates having an alkyl group with an average of 10 to 20 carbon atoms, alkenyl sulfonates (α-olefin sulfonates) with an average of 10 to 20 carbon atoms, alkyl sulfoacetates having an alkyl group with an average of 10 to 20 carbon atoms, alkyl sulfates with an average of 10 to 20 carbon atoms, and alkanesulfonates with an average of 10 to 20 carbon atoms. These anionic surfactants may be used individually or in combination of two or more.

[0036] Examples of nonionic surfactants include polyethylene glycol-type surfactants such as higher alcohol ethylene oxide adducts, alkylphenol ethylene oxide adducts, fatty acid ethylene oxide adducts, polyhydric alcohol fatty acid ester ethylene oxide adducts, higher alkylamine ethylene oxide adducts, fatty acid amide ethylene oxide adducts, ethylene oxide adducts of oils and fats, and polypropylene glycol ethylene oxide adducts, as well as polyhydric alcohol-type surfactants such as fatty acid esters of glycerol, fatty acid esters of pentaerythritol, fatty acid esters of sorbitol and sorbitan, fatty acid esters of sucrose, alkyl ethers of polyhydric alcohols, and fatty acid amides of alkanolamines. These nonionic surfactants may be used individually or in combination of two or more.

[0037] Examples of cationic surfactants include quaternary ammonium salts such as alkyl(C6-C20)trimethylammonium salts, dialkyl(C6-C20)dimethylammonium salts, and alkyl(C6-C20)dimethylbenzylammonium salts, alkyl(C6-C20)amine salts, alkyl(C6-C20)amine ethylene oxide adducts, and alkylpyridinium salts. These cationic surfactants may be used individually or in combination of two or more.

[0038] Examples of amphoteric surfactants include amino acid-type surfactants such as alkylaminopropionates having an alkyl group with an average of 10 to 16 carbon atoms, and betaine-type surfactants such as alkyldimethyl betaine and lauryl hydroxyethyl betaine having an alkyl group with an average of 10 to 16 carbon atoms. These amphoteric surfactants may be used individually or in combination of two or more.

[0039] In the various surfactants mentioned above, examples of salt forms include alkali metal salts such as sodium and potassium, alkaline earth metal salts such as magnesium and calcium, ammonium salts, amine salts, and acid addition salts such as hydrochloride salts.

[0040] Among these surfactants, anionic surfactants are preferred, and alkenyl sulfonates (α-olefin sulfonates) and alkyl sulfoacetates are more preferred.

[0041] These surfactants may be used individually or in combination of two or more.

[0042] The content of component (C) in the cleaning composition can be appropriately set depending on the type of surfactant used, the object to be cleaned, etc., but for example, 1 to 10% by weight, preferably 2 to 8% by weight, and more preferably 3 to 6% by weight are given.

[0043] (D) Bleach The cleaning composition used in the present invention may also contain a bleaching agent (sometimes referred to as "(D) component") in addition to the components described above. Including a bleaching agent can further improve the cleaning effect.

[0044] There are no particular restrictions on the type of bleach used, but examples include chlorine-based bleach, oxygen-based bleach, and reducing bleach.

[0045] Examples of chlorine-based bleaches include dichloroisocyanurates and hypochlorites. Specifically, examples of dichloroisocyanurates include alkali metal salts such as sodium salts and potassium salts. Specifically, examples of hypochlorites include alkali metal salts such as sodium salts and potassium salts.

[0046] Examples of oxygen-based bleaching agents include hydrogen persulfate, persulfate, percarbonate, perborate, and tetraacetylethylenediamine. Specific examples of hydrogen persulfate include alkali metal salts such as lithium salt, sodium salt, and potassium salt; alkali metal salts such as barium salt; ammonium salt; and hydrates thereof. Note that hydrogen persulfate may also be a double salt with hydrogen sulfate or sulfate. Specific examples of persulfate include alkali metal salts such as sodium salt and potassium salt; ammonium salt; and hydrates thereof. Specific examples of percarbonate include alkali metal salts such as sodium salt and potassium salt; ammonium salt; and hydrates thereof. Specific examples of perboric acid include alkali metal salts such as sodium salt and potassium salt; ammonium salt; and hydrates thereof.

[0047] Examples of reducing bleaching agents include thiourea dioxide and hydrosulfite.

[0048] Among these bleaching agents, chlorine-based bleaching agents are preferred, and dichloroisocyanurate salts are even more preferred.

[0049] These bleaches may be used individually or in combination of two or more types.

[0050] When the cleaning composition contains component (D), the amount can be appropriately set depending on the type of bleach used, the object to be cleaned, etc., but for example, 3 to 25% by weight, preferably 5 to 15% by weight, and more preferably 7 to 10% by weight are given.

[0051] (E) Heating agent The cleaning composition used in the present invention may also contain a heat-generating agent (sometimes referred to as "component (E)") in addition to the components described above. Including a heat-generating agent makes it possible to more effectively suppress the decrease in foaming volume at low water temperatures.

[0052] Any heat-generating agent that generates heat upon contact with water is acceptable, but examples include inorganic salts of calcium such as calcium oxide, calcium chloride, calcium sulfate, and calcium carbonate; inorganic salts of magnesium such as magnesium sulfate and magnesium chloride; inorganic salts of aluminum such as aluminum sulfate and aluminum chloride; inorganic salts of zinc such as zinc chloride and zinc sulfate; and inorganic salts of iron such as ferric chloride and ferrous sulfate.

[0053] Among these pyrogens, preferably, are inorganic salts of calcium, inorganic salts of magnesium, and more preferably, calcium oxide and magnesium sulfate.

[0054] These heating agents may be used individually or in combination of two or more types.

[0055] When the cleaning composition contains component (E), the amount can be appropriately set according to the type of exothermic agent used, the exothermic properties to be imparted, etc., but for example, 3 to 25% by weight, preferably 5 to 15% by weight, and more preferably 7 to 10% by weight are given.

[0056] (F) Carbonates, bicarbonates and double salts of carbonates The cleaning composition used in the present invention may also contain, in addition to the components described above, a carbonate and / or a double salt of bicarbonate and carbonate (sometimes referred to as "component (F)"). By including a carbonate and / or a double salt of bicarbonate and carbonate, the amount of foaming can be further increased.

[0057] As long as carbonates and double salts of bicarbonates and carbonates are water-soluble, there are no particular restrictions on their type. For example, examples of carbonates include alkali metal salts of carbonic acid such as sodium carbonate and potassium carbonate, and examples of double salts of bicarbonates and carbonates include sodium sesquicarbonate.

[0058] Carbonates, and / or double salts of bicarbonates and carbonates, may be used individually or in combination of two or more types.

[0059] When the cleaning composition contains component (F), there are no particular restrictions on its content, but for example, it may be 1 to 40% by weight, preferably 2 to 25% by weight, and more preferably 3 to 15% by weight.

[0060] Other ingredients In addition to the components described above, the cleaning composition used in the present invention may optionally contain other additives. Examples of such additives include chelating agents, pH adjusters, enzymes, colorants, fragrances, deodorants, foam stabilizers, preservatives, antibacterial / bactericidal agents, antiseptics, rust inhibitors, and bulking agents.

[0061] • Shape and capacity The form of the cleaning composition used in the present invention is not particularly limited and may be in the form of powder, granules, etc., but it is preferably in the form of powder.

[0062] In the foaming cleaning agent of the present invention, the amount of cleaning composition contained in each water-soluble packaging is not particularly limited and may be set appropriately with ease of use in mind. However, it is desirable that the amount of cleaning composition contained in each water-soluble packaging be set to the amount required for one cleaning. For example, when the foaming cleaning agent of the present invention is used to clean a toilet bowl, it is sufficient to contain about 10 to 200 g, preferably about 20 to 180 g, more preferably about 50 to 150 g, and particularly preferably about 80 to 150 g of cleaning composition per water-soluble packaging for one use.

[0063] [Water-soluble packaging material] The foaming cleaning agent of the present invention includes a water-soluble packaging material as a component for containing the cleaning composition. The water-soluble packaging material can be any material that can enclose the cleaning composition and dissolves upon contact with water. Examples of materials for the water-soluble packaging material include water-soluble film and water-soluble paper.

[0064] A water-soluble film is a film formed from a water-soluble polymer. Examples of water-soluble polymers that make up a water-soluble film include celluloses such as methylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, carboxymethylcellulose sodium, etc.; starches such as soluble starch, sodium starch glycolate, sodium starch phosphate; natural polysaccharides such as pectin, carrageenan, locust bean gum, guar gum, gum arabic, tragacanth gum, xanthan gum, and sodium alginate; gelling agents such as polyvinyl alcohol, polyvinylpyrrolidone, polyethylene glycol, sodium polyacrylate, and propylene glycol alginate; and proteins such as gelatin and sodium caseinate. In a water-soluble film, these water-soluble polymers may be included individually or in combination of two or more.

[0065] Water-soluble paper is paper made using water-soluble fibers, or paper made using non-water-soluble fibers and then treated to become water-soluble. Examples of paper made using water-soluble fibers include paper made using the aforementioned water-soluble polymer fibers. Examples of paper made using non-water-soluble fibers and then treated to become water-soluble include paper made using non-water-soluble polymer fibers, which is then treated with an alkaline solution such as sodium hydroxide solution or ammonium solution to make it water-soluble.

[0066] Preferably, the material for the water-soluble packaging material is a film formed from a water-soluble polymer, and more preferably, a film formed from polyvinyl alcohol.

[0067] The shape of the water-soluble packaging material is not particularly limited and may be bag-shaped, box-shaped, cup-shaped, etc., but bag-shaped is preferred. The size of the water-soluble packaging material may be appropriately set according to the amount of the cleaning composition to be contained.

[0068] [Manufacturing method] The foaming cleaning agent of the present invention is manufactured by filling the cleaning composition through an opening in the water-soluble packaging material. After filling the cleaning composition through an opening in the water-soluble packaging material, it is desirable that the opening be sealed by heat sealing, a water-soluble adhesive, or the like.

[0069] [Items to be cleaned. Instructions for use.] The objects to be cleaned by the foaming cleaning agent of the present invention are not particularly limited, but examples include toilet bowls, drain pipes, sinks, washing machine tubs, bathtubs, etc. Among these, toilet bowls are preferred.

[0070] The foaming cleaning agent of the present invention is used by immersing the cleaning composition, while it is contained in the water-soluble packaging material, in water within the object to be cleaned. When the foaming cleaning agent of the present invention is immersed in water within the object to be cleaned, the water-soluble packaging material gradually dissolves, and the cleaning composition comes into contact with the water, causing the foaming action of components (A) and (B) and the surfactant action of component (C) to occur, and the object to be cleaned is cleaned. If water is stored in the object to be cleaned, such as a toilet bowl, the foaming cleaning agent of the present invention can be added directly. If water is not stored in the object to be cleaned, water can be added to the object before or after adding the foaming cleaning agent of the present invention. [Examples]

[0071] The present invention will be described in detail below with reference to examples, but the present invention is not limited to these examples.

[0072] The trade names and sources of the bicarbonates used in the following examples and comparative examples are as follows, and the particle size distribution and average particle diameter measured by the sieving test method are shown in Table 1. Sodium bicarbonate A : "Sodium Bicarbonate M Grade" (Tokuyama Corporation) Sodium bicarbonate B : "Sodium Bicarbonate P Grade" (Tokuyama Corporation) Sodium bicarbonate C: "Sodium Bicarbonate Grade E" (Tokuyama Corporation)

[0073] [Table 1]

[0074] Test Example 1 A powdered cleaning composition was prepared by mixing the components shown in Table 2. 120 g of the obtained cleaning composition was placed in a water-soluble packaging material made from a water-soluble film (made of polyvinyl alcohol, trade name "Hyceron", Nippon Synthetic Chemical Industry Co., Ltd.) processed into a bag measuring 10 cm in length and 14 cm in width. The packaging material was then heat-sealed to produce a foaming cleaning agent.

[0075] One packet of the resulting foaming cleaning agent was added to a toilet bowl with water adjusted to 5°C, and the degree of foaming was observed over time. For comparison, 120g of the cleaning composition was added to a toilet bowl with water adjusted to 5°C without being placed in water-soluble packaging, and the degree of foaming was observed over time.

[0076] Figure 1 shows the results of observing the degree of foaming 3 minutes and 10 minutes after adding a foaming detergent or cleaning composition. From these results, it was confirmed that the amount of foaming was significantly greater when the cleaning composition was added in a water-soluble packaging material compared to when it was added in powder form.

[0077] [Table 2]

[0078] Test Example 2 A powdered cleaning composition was prepared by mixing the components shown in Tables 3 and 4. 10 g of the obtained cleaning composition was placed in a water-soluble packaging material made from a water-soluble film (made of polyvinyl alcohol, trade name "Hyceron", Nippon Synthetic Chemical Industry Co., Ltd.) that was processed into a bag measuring 6.1 cm in length and 4.1 cm in width. The packaging material was then heat-sealed to produce a foaming cleaning agent. In Comparative Example 2, the product was not placed in a water-soluble packaging material.

[0079] 500 mL of deionized water was placed in a 2 L graduated cylinder, and after adjusting the temperature to 5°C or 25°C, one packet of each effervescent detergent or 10 g of the cleaning composition of Comparative Example 2 was added to the graduated cylinder. Next, the foam generation was observed, and the scale on the graduated cylinder was read at the point when the foam volume was at its maximum (1 to 10 minutes after addition) to determine the maximum foam volume (maximum amount of foam generated).

[0080] The results obtained are shown in Tables 3 and 4. As is clear from the comparison between Example 2 and Comparative Example 2, the cleaning composition containing acid, sodium bicarbonate, and surfactant produced more foam at room temperature (25°C) and low temperature (5°C) when immersed in a water-soluble packaging material than when immersed directly in water, and the decrease in foam volume at low temperature (5°C) was also suppressed. Furthermore, even when the cleaning composition was contained in a water-soluble packaging material, using sodium bicarbonate A and B, which have a particle size of less than 180 μm of 30% or more, resulted in a larger maximum foam volume at 25°C and 5°C and suppressed the decrease in foam volume at low temperature (5°C) compared to using sodium bicarbonate C, which has a particle size of less than 180 μm of 12%. In particular, when sodium bicarbonate B, which has a particle size of less than 180 μm of 100%, was used, the foam volume at room temperature (25°C) and low temperature (5°C) was significantly larger, and the decrease in foam volume at low temperature (5°C) was also significantly smaller.

[0081] [Table 3]

[0082] [Table 4]

Claims

1. The cleaning composition is contained in a water-soluble packaging material. The cleaning composition contains (A) an acid, (B) a bicarbonate, and (C) a surfactant. In the aforementioned bicarbonate, the proportion of particles smaller than 180 μm is 30% by weight or more. The material of the aforementioned water-soluble packaging material is a polyvinyl alcohol film, and A foaming cleaner used for cleaning toilet bowls.

2. The cleaning composition is contained in a water-soluble packaging material. The cleaning composition contains (A) an acid, (B) a bicarbonate, and (C) a surfactant. In the aforementioned bicarbonate, the proportion of particles smaller than 180 μm is 30% by weight or more, and A foaming cleaning agent in which the material of the water-soluble packaging material is a polyvinyl alcohol film.

3. The foaming detergent according to claim 1 or 2, wherein the proportion of particles measuring 45 μm or more and less than 180 μm in size among the bicarbonate is 50% by weight or more.

4. The foaming detergent according to any one of claims 1 to 3, wherein the proportion of particles smaller than 106 μm in size among the bicarbonate is 80% by weight or more.

5. The foaming detergent according to any one of claims 1 to 4, wherein the bicarbonate is sodium bicarbonate.

6. The foaming detergent according to any one of claims 1 to 5, wherein the acid is an organic acid.

7. The foaming cleaning agent according to any one of claims 1 to 6, wherein the cleaning composition further comprises a bleaching agent.

8. A cleaning method comprising immersing a foaming cleaning agent according to any one of claims 1 to 7 in water inside a toilet bowl.

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