Solid detergent composition

Abstract

To provide a solid detergent composition which is excellent in foaming and foam quality in a weakly acidic range, has moderate deformation by dissolution, and includes, as a main base agent, an N-acyltaurine salt excellent in releasability in production.SOLUTION: A solid detergent composition is excellent in releasability in production, is usable in a weak acid pH region, has moderate deformation by dissolution, and is excellent in foaming and foam quality by blending an N-acyltaurine salt and an N-acylamino acid salt at specific ratios, and further blending an amphoteric surfactant at a specific ratio to achieve a specific pH.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a solid detergent composition that has excellent releasability during production, can be used in a weakly acidic range, exhibits moderate disintegration, and produces excellent foam quality. [Background technology]

[0002] Solid detergent compositions generally use anionic surfactants as the main base, with higher fatty acid salts being the most commonly used. Although higher fatty acid salts are excellent in foaming and foam quality, their alkaline pH can sometimes cause skin irritation problems. Therefore, there is a wide demand for mild solid detergents. For example, mild solid detergents that use N-acylamino acid salts such as N-acyl glutamate and N-acyl glycine salt as the main base are known. These anionic surfactants are characterized by their ability to be used in the weakly acidic range that is gentle on the skin, but when used as the main base, they can easily dissolve and crumble. Regarding solid detergents containing N-acylamino acid salts as the main base that are resistant to dissolution, a solid detergent composition containing N-acyltaurine salts as the main base (see, for example, Patent Document 1) has been disclosed, but the release properties are sometimes poor, and improvements are needed in terms of manufacturing. Furthermore, when used in a weakly acidic pH range that is gentle on the skin, the foaming and foam quality are sometimes poor, and improvements are needed in terms of usability as well. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 8-245981 Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention aims to provide a solid detergent composition containing an N-acyltaurine salt, which has excellent foaming and foam quality in the weak acidic range, moderate disintegration, and excellent releasability during production. [Means for solving the problem]

[0005] The present inventors conducted extensive research to solve the above problems and found that by combining an N-acyltaurine salt and an N-acylamino acid salt in a specific ratio, and blending an amphoteric surfactant in a specific ratio and setting the pH at a specific level, the product has excellent release properties during production, can be used in a weakly acidic pH range, exhibits moderate disintegration, and provides excellent foaming and foam quality. That is, the present invention is as follows. (1) A solid detergent composition comprising (A) 30.0-50.0% by weight of an N-acyltaurine salt represented by general formula (1), (B) 10.0-40.0% by weight of an N-acylamino acid salt, and (C) 5.0-30.0% by weight of an amphoteric surfactant, and having a pH of 5.5 to 7.0. [ka] (In general formula (1), RCO represents a linear acyl group having 10 to 16 carbon atoms. M in general formula (1) represents an alkali metal atom, an alkaline earth metal atom, or a cationic residue of a basic amino acid.) (2) The solid detergent composition according to (1), wherein the N-acylamino acid salt of component (B) is at least one selected from N-acylglutamic acid, N-acylglycine, and salts thereof. (3) The solid detergent composition according to (1) and (2), wherein the amphoteric surfactant (C) is at least one selected from the group consisting of amidobetaine, sulfobetaine, and imidazoline surfactants. [Effects of the Invention]

[0006] According to the present invention, by combining an N-acyltaurine salt and an N-acylamino acid salt in a specific ratio, blending an amphoteric surfactant in a specific ratio, and adjusting the pH to a specific value, a solid detergent composition is obtained that has excellent release properties during production, can be used in a weakly acidic pH range, exhibits moderate disintegration, and has excellent foaming and foam quality. DETAILED DESCRIPTION OF THE INVENTION

[0007] Hereinafter, an embodiment of the present invention will be described. The N-acyltaurine salt, component (A), is represented by the general formula (1). [ka] In general formula (1), RCO represents a linear acyl group having 10 to 16 carbon atoms. If the chain length of the acyl group is less than 10, foaming and releasability may decrease, while if the chain length of the acyl group is more than 16, foaming may decrease. From the viewpoint of foaming and releasability, a linear acyl group having 12 carbon atoms is more preferred, and as the mixed fatty acid acyl group, a coconut oil fatty acid acyl group (cocoyl group) having a lauroyl group as the main component is preferred.

[0008] For example, the N-acyltaurine salt of component (A) includes lauroyl taurine salt, myristoyl taurine salt, palmitoyl taurine salt, cocoyl taurine salt, etc. The N-acyltaurine salt of component (A) may be used alone or in combination of two or more.

[0009] In general formula (1), M represents an alkali metal atom, an alkaline earth metal atom, or a cationic residue of a basic amino acid. Examples of alkali metal atoms include sodium and potassium. Examples of alkaline earth metal atoms include magnesium. Examples of cationic residues of basic amino acids include arginine, lysine, and histidine. In order to obtain a product that is easy to handle during production, sodium, potassium, and arginine are preferred, and sodium or potassium is more preferred.

[0010] By incorporating 30.0-50.0 wt% of the N-acyltaurine salt in the solid detergent composition of the present invention in a pure content, the releasability is improved. From the viewpoint of releasability, the amount incorporated in the solid detergent composition is more preferably 40.0-50.0 wt% in pure content. If incorporated in an amount exceeding 50.0 wt%, the water solubility may decrease and foaming may become poor. If incorporated in an amount less than 30.0 wt%, the composition may be prone to disintegration.

[0011] The component (A) used in the solid detergent composition of the present invention can be an N-acyltaurine salt-containing composition having an N-acyltaurine salt purity of 75% by weight or more. In addition to the N-acyltaurine salt, the composition may contain solvents such as water, raw material residues, by-products such as free fatty acids, and other additives. Examples include unreacted taurine, fatty acids, fatty acid salts, NaOH, KOH, etc. If the purity is less than 75% by weight, the composition may foam poorly or dissolve more easily.

[0012] Examples of the N-acylamino acid salt of component (B) include N-acylmethylalanine salt, N-acylsarcosine salt, N-acylmethyltaurine salt, N-acylglutamate, N-acylaspartate, N-acylglycine salt, etc. Specific examples of the N-acylmethylalanine salt include cocoylmethylalanine salt (a commercially available product is Alanon (registered trademark) ACE manufactured by Kawaken Fine Chemicals Co., Ltd.), myristoylmethylalanine salt (a commercially available product is Alanon AME manufactured by Kawaken Fine Chemicals Co., Ltd.), and lauroylmethylalanine salt (a commercially available product is Alanon ALE or ALTA manufactured by Kawaken Fine Chemicals Co., Ltd.). Specific examples of N-acyl sarcosine salts include oleoyl sarcosine salt, cocoyl sarcosine salt (a commercially available product is Soypon (registered trademark) SCE manufactured by Kawaken Fine Chemical Co., Ltd.), palmitoyl sarcosine salt, myristoyl sarcosine salt (a commercially available product is Soypon M-30 manufactured by Kawaken Fine Chemical Co., Ltd.), and lauroyl sarcosine salt (a commercially available product is Soypon SLE and SLTA manufactured by Kawaken Fine Chemical Co., Ltd.). Specific examples of N-acyl methyl taurine salts include oleoyl methyl taurine salt, caproyl methyl taurine salt, cocoyl methyl taurine salt, stearoyl methyl taurine salt, palmitoyl methyl taurine salt, myristoyl methyl taurine salt, and lauroyl methyl taurine salt. Specific examples of N-acyl glutamates include olive oil fatty acid glutamate, capryloyl glutamate, cocoyl glutamate, stearoyl glutamate, palm fatty acid glutamate, palmitoyl glutamate, myristoyl glutamate, lauroyl glutamate, hydrogenated tallow glutamate, horse oil acyl glutamate, horse oil fatty acid glutamate, (coconut fatty acid / palm fatty acid / sunflower fatty acid) glutamate, (coconut fatty acid / hydrogenated beef tallow fatty acid) glutamate, etc. Specific examples of N-acylaspartates include acyl (C12,14) aspartate, myristyl aspartate, myristyl aspartic acid taurine, lauryl aspartate, lauryl aspartic acid taurine, lauroyl aspartate, etc.Examples of N-acylglycine salts include capryloylglycine salt, cocoylglycine salt, palmitoylglycine salt, lauroylglycine salt, etc. Examples of other N-acylamino acid salts include lauroylhydroxyethyl-β-alanine salt.

[0013] As the N-acylamino acid salt of component (B), N-acylglutamic acid salt or N-acylglycine salt is preferred, as it has excellent foaming properties in the weakly acidic pH range.

[0014] The number of carbon atoms in the acyl group of the N-acylamino acid salt, component (B), is not particularly limited, but from the viewpoint of improving foaming and releasability, an acyl group having 10 to 16 carbon atoms is preferred, with 10 to 14 carbon atoms being particularly preferred. A linear acyl group (lauroyl group) having 12 carbon atoms is particularly preferred, and a coconut oil fatty acid acyl group (cocoyl group) containing a lauroyl group as the main component is preferred as a mixed fatty acid acyl group. Examples include lauroyl glutamate, lauroyl glycine salt, cocoyl glutamate, and cocoyl glycine salt.

[0015] Examples of the salt of component (B) include metal salts such as sodium salt, potassium salt, magnesium salt, etc., and organic salts such as arginine salt, lysine salt, histidine salt, etc. In order to obtain a product that is easy to handle during production, sodium salt, potassium salt, and arginine salt are preferred, and sodium salt or potassium salt is more preferred.

[0016] The solid detergent composition of the present invention can improve foaming and foam quality by incorporating 10.0-40.0 wt. % of the N-acylamino acid salt (component (B)) in a pure amount. If the amount is less than 10.0 wt. %, the effect of improving foaming and foam quality may not be sufficient, while if the amount is more than 40.0 wt. The composition may be prone to dissolution and collapse. From the viewpoint of foaming, a more preferable amount is 30.0-40.0%. The N-acylamino acid salt (component (B)) may be used alone or in combination of two or more.

[0017] The N-acylamino acid salt, which is component (B) used in the solid detergent composition of the present invention, may contain, in addition to the N-acylamino acid salt, a solvent such as water or an organic solvent, raw material residues, by-products such as free fatty acids, and other additives.

[0018] Examples of the amphoteric surfactant (C) include amidobetaine amphoteric surfactants, sulfobetaine amphoteric surfactants, and imidazoline amphoteric surfactants. Specific examples of amidobetaine amphoteric surfactants include lauramidopropyl betaine (a commercially available product is Softazoline (registered trademark) LPB-R manufactured by Kawaken Fine Chemicals Co., Ltd.), cocamidopropyl betaine (a commercially available product is Softazoline CPB-R manufactured by Kawaken Fine Chemicals Co., Ltd.), palm kernel fatty acid amidopropyl betaine, (capryl / capramido)propyl betaine, myristamidopropyl betaine, and undecylenamidopropyl betaine. Specific examples of sulfobetaine amphoteric surfactants include lauramidopropyl hydroxysultaine (a commercially available product is Softazoline LSB-R manufactured by Kawaken Fine Chemicals Co., Ltd.), lauryl hydroxysultaine, and cocamidopropyl hydroxysultaine. Specific examples of imidazoline-type amphoteric surfactants include sodium lauroamphoacetate (commercially available products include Softazoline LHL-SF, manufactured by Kawaken Fine Chemicals Co., Ltd.), sodium cocoamphoacetate (commercially available products include Softazoline CH-R and CL-R, manufactured by Kawaken Fine Chemicals Co., Ltd.), and sodium palmamphoacetate. Examples of imidazoline-type amphoteric surfactants that do not contain salt due to their manufacturing process include sodium cocoamphopropionate (commercially available products include Softazoline NS, SF, and SFD, manufactured by Kawaken Fine Chemicals Co., Ltd.) and disodium cocoamphodipropionate. Examples of amine oxide-type amphoteric surfactants that do not contain salt due to their manufacturing process include lauramidopropylamine oxide (commercially available products include Softazoline LAO-C, manufactured by Kawaken Fine Chemicals Co., Ltd.), cocamidopropylamine oxide, lauramine oxide, and cocoamine oxide. As the amphoteric surfactant of component (C), cocamidopropyl betaine and lauramidopropyl betaine are more preferred from the viewpoint of improving foaming and foam quality. The amphoteric surfactant (C) may be used alone or in combination of two or more. Although not particularly limited, when improving the ease of dissolution and crumbling, it is preferable to use an amphoteric surfactant (C) that does not contain salt, such as a desalted purified product.

[0019] By incorporating 5.0-30.0 wt. % of the amphoteric surfactant (C) into the solid detergent composition of the present invention in a pure active ingredient content, foaming and foam quality are improved. If the content is less than 5.0%, the effects of improving foaming and foam quality may not be achieved, while if it exceeds 30.0%, the composition may be prone to disintegration. From the perspectives of foaming, foam quality, and disintegration, a content of 10.0-20.0% is more preferable.

[0020] The amphoteric surfactant, component (C), used in the solid detergent composition of the present invention may contain, in addition to the amphoteric surfactant, a solvent such as water or an organic solvent, raw material residues, by-products such as free fatty acids, and other additives.

[0021] From the viewpoints of foaming and disintegration, the solid detergent composition of the present invention preferably has a pH of 5.0 to 7.0, more preferably 6.2 to 6.8. If the pH is less than 5.0, foaming may be significantly reduced, and if the pH is more than 7.0, disintegration may occur.

[0022] The pH adjuster used in the solid detergent composition of the present invention may include alkali metal hydroxides such as KOH and NaOH, alkanolamines such as triethanolamine, and organic acids such as citric acid, lactic acid, glutamic acid, malic acid, etc. Use of inorganic acids such as hydrochloric acid may result in poor stability over time and at low temperatures.

[0023] Furthermore, known components can be appropriately blended into the solid detergent composition of the present invention within the range that does not impair the effects of the present invention. For example, glycols such as glycerin, lactones such as γ-docosalactone, gluconolactone, and erucalactone, cetyl 2-ethylhexanoate, di-2-heptylundecyl adipate, diglyceryl adipate mixed fatty acid ester, isostearyl isostearate, octyldodecyl isostearate, phytosteryl isostearate, propylene glycol isostearate, isodecyl benzoate, isotridecyl isononanoate, isononyl isononanoate, and eicosanedioic acid / te Toradecanedioic acid) polyglyceryl, cetyl octanoate, ethyl oleate, phytosteryl oleate, di-2-ethylhexyl succinate, diethylhexyl succinate, succinic acid bis(diethylene glycol ethyl ether) ester, diglyceryl diisostearate, propylene glycol dicaprylate, neopentyl glycol dicaprate, tripropylene glycol dineopentanoate, ester of dipentaerythritol with mixed fatty acids such as hydroxystearic acid / stearic acid / rosin acid ter, dilinoleic acid di (phytostearyl / isostearyl / cetyl / stearyl / behenyl), isocetyl stearate, stearyl stearate, hydrogenated castor oil stearate, diethyl sebacate, diethyl sebacate, dextrin fatty acid ester, pentaerythrityl tetra-2-ethylhexanoate, pentaerythritol tetra-2-ethylhexanoate, caprylic / capric triglyceride, glyceryl tri-2-ethylhexanoate, triethylhexanoin, iso neopentanoate ester oils such as decyl, isopropyl palmitate, ethylhexyl palmitate, octyl palmitate, hydrogenated castor oil hydroxystearic acid, phytosteryl isostearate, isopropyl myristate, octyldodecyl myristate, myristyl myristate, and diisostearyl malate; urethanes such as urethane resins, hydrophobically modified polyether urethanes, and polyurethane gels; preservatives such as methylparaben and propylparaben; colorants; and fragrances such as benzyl alcohol. [Example]

[0024] The effects of the present invention will be explained in more detail with reference to the following examples, but the present invention is not limited to these examples. In the examples, unless otherwise specified, the components used were special grade or first grade reagents purchased from Fujifilm Wako Pure Chemical Industries, Ltd.

[0025] N-acyltaurine salts were produced according to Synthesis Examples 1 to 7.

[0026] Synthesis Example 1 (Cocoyl Taurine K) In a four-neck flask, 34.12 g (0.27 mol) of taurine was dissolved in 225.49 g of water and 79.08 g (0.68 mol) of 48% caustic potassium salt. Next, 61.31 g (0.25 mol) of coconut oil fatty acid chloride was added dropwise to carry out the acylation reaction. After the addition, the mixture was stirred for an additional 30 minutes. After the reaction, water was added to bring the concentration of the reactant to approximately 1%, and the mixture was stirred at 50°C for 30 minutes. The temperature was then gradually lowered to precipitate potassium cocoyl taurate. This was filtered, washed with water, and dried to obtain 22.65 g of white crystals. Analysis by high-performance liquid chromatography (column: GL Sciences Inertsil® ODS-2, 150 mm, eluent: 0.1 mol / L NaOHPO (pH 2.1, phosphoric acid) / MeOH = 25 / 75), gas chromatography-mass spectrometry (column: Agilent Technologies DB-WAX UI, carrier gas: He), and liquid chromatography-mass spectrometry (column: GL Sciences Inertsil ODS-2, 150 mm, eluent: ultrapure water / MeOH = 40 / 60) revealed that the purity of the potassium cocoyl taurate in the white crystals was 95% by weight. Free fatty acids were 4% by weight, and other salts and raw material residues were less than 1% by weight.

[0027] Synthesis Example 2 (Sodium Lauroyl Taurate) In a four-neck flask, 34.12 g (0.27 mol) of taurine was dissolved in 225.49 g of water and 58.83 g (0.71 mol) of 48% caustic soda. Next, 58.75 g (0.25 mol) of lauric acid chloride was added dropwise to carry out the acylation reaction. After the addition was completed, the mixture was stirred for an additional 30 minutes. After the reaction, water was added to adjust the concentration of the reactant to approximately 1%, and the mixture was stirred at 50°C for 30 minutes. The temperature was then gradually lowered to precipitate sodium lauroyl taurine. This was filtered, washed with water, and dried to obtain 21.97 g of white crystals. Analysis in the same manner as in Synthesis Example 1 revealed that the purity of the sodium lauroyl taurine in the white crystals was 95 wt%. The free fatty acids were 4 wt%, and other salts and raw material residues were less than 1 wt%.

[0028] Synthesis Example 3 (Myristoyl Taurine K) In a four-neck flask, 34.12 g (0.27 mol) of taurine was dissolved in 225.49 g of water and 79.08 g (0.68 mol) of 48% caustic potassium salt. Then, 66.28 g (0.25 mol) of myristate chloride was added dropwise to carry out the acylation reaction. After the addition, the mixture was stirred for an additional 30 minutes. After the reaction, water was added to adjust the concentration of the reactant to approximately 1%, and the mixture was stirred at 50°C for 30 minutes. The temperature was then gradually lowered to precipitate myristoyl taurine potassium salt. The precipitate was filtered, washed with water, and dried to obtain 23.97 g of white crystals. Analysis in the same manner as in Synthesis Example 1 revealed that the purity of the myristoyl taurine potassium salt in the white crystals was 95 wt%, the free fatty acids were 4 wt%, and other salts and raw material residues were less than 1 wt%.

[0029] Synthesis Example 4 (Sodium Palmitoyl Taurate) In a four-neck flask, 34.12 g (0.27 mol) of taurine was dissolved in 225.49 g of water and 58.83 g (0.71 mol) of 48% caustic soda. Then, 73.81 g (0.25 mol) of palmitic acid chloride was added dropwise to carry out the acylation reaction. After the addition, the mixture was stirred for an additional 30 minutes. After the reaction, water was added to adjust the concentration of the reactant to approximately 1%, and the mixture was stirred at 50°C for 30 minutes. The temperature was then gradually lowered to precipitate palmitoyl taurine sodium salt. This was filtered, washed with water, and dried to obtain 25.98 g of white crystals. Analysis performed in the same manner as in Synthesis Example 1 revealed that the purity of palmitoyl taurine sodium salt in the white crystals was 95 wt%. The free fatty acids were 4 wt%, and other salts and raw material residues were less than 1 wt%.

[0030] Synthesis Example 5 (Sodium Capryloyl Taurate) In a four-neck flask, 34.12 g (0.27 mol) of taurine was dissolved in 225.49 g of water and 58.83 g (0.71 mol) of 48% caustic soda. Next, 51.21 g (0.25 mol) of capric acid chloride was added dropwise to carry out the acylation reaction. After the addition, the mixture was stirred for an additional 30 minutes. After the reaction, water was added to adjust the concentration of the reactant to approximately 1%, and the mixture was stirred at 50°C for 30 minutes. The temperature was then gradually lowered to precipitate capryloyl taurine sodium salt. This was filtered, washed with water, and dried to obtain 19.96 g of white crystals. Analysis similar to that in Synthesis Example 1 revealed that the purity of the capryloyl taurine sodium salt in the white crystals was 95 wt%. The free fatty acids were 4 wt%, and other salts and raw material residues were less than 1 wt%.

[0031] Synthesis Example 6 (Sodium Stearoyl Taurate) In a four-neck flask, 34.12 g (0.27 mol) of taurine was dissolved in 225.49 g of water and 58.83 g (0.71 mol) of 48% caustic soda. Next, 81.35 g (0.25 mol) of stearic acid chloride was added dropwise to carry out the acylation reaction. After the addition, the mixture was stirred for an additional 30 minutes. After the reaction, water was added to adjust the concentration of the reactant to approximately 1%, and the mixture was stirred at 50°C for 30 minutes. The temperature was then gradually lowered to precipitate sodium stearoyl taurine. The precipitate was filtered, washed with water, and dried to obtain 27.98 g of white crystals. Analysis similar to that in Synthesis Example 1 revealed that the purity of the sodium stearoyl taurine in the white crystals was 95 wt%. The free fatty acids were 4 wt%, and other salts and raw material residues were less than 1 wt%.

[0032] Synthesis Example 7 (Sodium oleoyl taurate) In a four-neck flask, 34.12 g (0.27 mol) of taurine was dissolved in 225.49 g of water and 58.83 g (0.71 mol) of 48% caustic soda. Next, 80.81 g (0.25 mol) of oleic acid chloride was added dropwise to carry out the acylation reaction. After the addition, the mixture was stirred for an additional 30 minutes. After the reaction, water was added to adjust the concentration of the reactant to approximately 1%, and the mixture was stirred at 50°C for 30 minutes. The temperature was then gradually lowered to precipitate sodium oleoyl taurine. This was filtered, washed with water, and dried to obtain 27.84 g of white crystals. Analysis in the same manner as in Synthesis Example 1 revealed that the purity of the sodium oleoyl taurine in the white crystals was 95 wt%. The free fatty acids were 4 wt%, and other salts and raw material residues were less than 1 wt%.

[0033] (Manufacturing example) The compositions containing the N-acyltaurine salts obtained in Synthesis Examples 1 to 7 and having the formulations shown in Tables 1 to 3 were mixed uniformly by a conventional method. Furthermore, an emulsion was added as needed, and the mixture was mixed uniformly. The pH was adjusted as needed. The mixture was further mixed uniformly using a three-roll mill, extruded into a rod shape using a kneading machine, and then stamped to obtain a solid detergent.

[0034] evaluation The solid detergents of Examples 1 to 16 and Comparative Examples 1 to 11 shown in Tables 1 to 3 were evaluated for releasability, foaming, foam quality, and dissolution, and the results are shown in Tables 1 to 3.

[0035] (Release evaluation) Thirty solid detergent particles were molded using a molding machine, and the state of the particles was observed and evaluated according to the following criteria. <Evaluation criteria> ◎: Very good (more than 27 out of 30 soaps did not stick to the mold and came off cleanly) 〇: Good (24 or more out of 30 soaps, but less than 27 soaps, had little soap adhering to the mold and came off cleanly) △: Slightly poor (18 or more out of 30 soaps, but less than 24 soaps, did not adhere well to the mold and came off cleanly) ×: Poor (less than 18 out of 30 soaps had little soap adhering to the mold and were removed cleanly)

[0036] (Foaming and foam quality evaluation) Each sample of Examples 1 to 16 and Comparative Examples 1 to 11 was distributed to a panel of five experts, who judged the lathering and foam quality (creamy feel) of the soap during actual use. The judgment was made according to the following evaluation criteria. <Evaluation criteria> ◎: Very good 〇: Good △: Slightly poor ×: Bad

[0037] (Evaluation of melting and crumbling) Each sample of Examples 1 to 16 and Comparative Examples 1 to 11 was distributed to a panel of five experts, who judged the degree of disintegration of the soap during actual use. The judgment was made according to the following evaluation criteria. <Evaluation criteria> ◎: Melts and disintegrates very well 〇: Moderate disintegration △: Melts and crumbles easily ×: Easy to melt and crumble

[0038] Examples 1 to 10 [Table 1]

[0039] Examples 11 to 16 [Table 2]

[0040] Comparative Examples 1 to 11 [Table 3]

[0041] *1 Ajinomoto Co., Ltd. Amisoft (registered trademark) CS-11, *2 Ajinomoto Co., Ltd. Amirite (registered trademark) GCS-11, *3 Ajinomoto Co., Ltd. Amirite (registered trademark) GCK-11, *4 Ajinomoto Co., Ltd. Amisoft LS-11, *5 Ajinomoto Co., Ltd. Amisoft HS-11P, *6 Evonik Japan Co., Ltd. TEGO (registered trademark) Betain CK D MB, *7 High Alcohol Corporation Cetyl Alcohol NX, *8 Ishihara Sangyo Kaisha, Ltd. Typec (registered trademark) A-100, *9 Chubu Cherest Co., Ltd. Cherest (registered trademark) 2B-SD, *10 Lion Specialty Chemicals Co., Ltd. Feriox (registered trademark) 115-A

[0042] Evaluation results Examples 1 to 16, which were prepared within the scope of the solid detergent composition of the present invention, were all rated as good or better, confirming that they had excellent releasability, foaming, and foam quality, and that they did not dissolve or crumble easily. On the other hand, Comparative Example 1, in which the amount of component (A) was below the range, exhibited poor release properties and was prone to melting and crumbling. Comparative Example 2, in which the amount of component (A) exceeded the range, exhibited reduced water solubility, poor foaming, and poor foam quality. Comparative Example 3, in which the amount of component (B) was below the range, exhibited poor foaming and foam quality. Comparative Example 4, in which the amount of component (B) exceeded the range, exhibited poor release properties and was prone to melting and crumbling. Comparative Example 5, in which the amount of component (C) was below the range, exhibited poor foaming and foam quality. Comparative Example 6, in which the amount of component (C) exceeded the range, was prone to melting and crumbling. Comparative Example 7, in which the chain length of the acyl group in component (A) was less than 10, exhibited severe softening of the soap, making it difficult to solidify. Comparative Example 8, in which the chain length of the acyl group in component (A) exceeded 16, exhibited poor foaming and foam quality. Comparative Example 9, in which the chain length of the acyl group in component (A) exceeded 16 and the soap had an unsaturated acyl group, exhibited severe softening of the soap, making it difficult to solidify. Comparative Example 10, which had a pH of less than 5.0, had poor foaming and foam quality, and Comparative Example 11, which had a pH of more than 7.0, was prone to disintegration. [Industrial Applicability]

[0043] The solid detergent composition of the present invention has excellent releasability during production, can be used in a weakly acidic pH range, exhibits moderate disintegration, and has excellent foaming and foam quality. Therefore, it can contribute to improving work efficiency and reducing costs during production, and can also increase the commercial value of personal care products such as solid soaps.

Claims

1. The solid detergent composition contains (A) 30.0-50.0% by weight of an N-acyltaurine salt represented by general formula (1), (B) 10.0-40.0% by weight of one or more N-acylamino acid salts, and (C) 5.0-30.0% by weight of an amphoteric surfactant, and has a pH of 5.5-7.

0. 【Chemical 1】 (In general formula (1), RCO represents a linear acyl group having 10 to 16 carbon atoms. M in general formula (1) represents an alkali metal atom, an alkaline earth metal atom, or a cationic residue of a basic amino acid.)

2. 2. The solid detergent composition according to claim 1, wherein the N-acylamino acid salt of component (B) is at least one selected from the group consisting of N-acylglutamic acid, N-acylglycine, and salts thereof.

3. 3. The solid detergent composition according to claim 1, wherein the amphoteric surfactant (C) is at least one selected from the group consisting of amidobetaine, sulfobetaine, and imidazoline surfactants.

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