Thickening agent for cleaning compositions and cleaning compositions containing the same

Abstract

The objective was to find a fatty acid amide amine with excellent viscosity-enhancing properties and low-temperature stability for use in combination with cleaning compositions. [Solution] When using a branched-chain fatty acid amide amine, in which the branched-chain fatty acid is an alkyl group, as a fatty acid amide amine that is highly effective in providing viscosity and low-temperature stability to the cleaning composition, high viscosity and low-temperature stability were achieved.

Description

Technical Field

[0001] The present invention relates to a thickener for cleaning that has excellent stability over time and a high thickening effect, and a cleaning composition containing the same.

Background Art

[0002] In recent years, for the purpose of reducing skin irritation during shampooing and imparting a moist feeling after washing, amino acid-based surfactants are used in anionic surfactants of shampoos.

[0003] However, since many of their aqueous solutions have low viscosities, thickeners are used in consideration of preventing dripping of the shampoo and handling properties during use. Conventionally, nonionic surfactants such as diethanolamide-type or monoethanolamide-type fatty acid alkanolamides and propylene glycol monofatty acid esters have been used as thickeners for these cleaning agents.

[0004] It is known that these nonionic surfactants are difficult to exhibit sufficient effects as thickeners for shampoos containing amino acid-based surfactants, and also have drawbacks in the low-temperature stability of shampoos.

[0005] Therefore, the thickening effect and low-temperature stability of shampoos containing fatty acid amide amines, which are cationic surfactants, have been reported (Patent Documents 1 and 2). However, the effects on the thickening property and long-term low-temperature storage stability of shampoos containing amino acid-based surfactants have not always been satisfactory.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Summary of the Invention

[0007] The objective was to find a fatty acid amide amine with excellent viscosity-enhancing properties and long-term stability at low temperatures, for use in combination with cleaning compositions. [Means for solving the problem]

[0008] The inventors diligently conducted research to find a fatty acid amide amine that is highly effective in providing viscosity and low-temperature stability to cleaning compositions, and as a result, they found that a fatty acid amide amine with a specific fatty acid residue exhibits extremely high efficacy in these areas.

[0009] In other words, the present invention relates to a cleaning thickener comprising a fatty acid amidoamine represented by general formula (1), and a cleaning composition containing this cleaning thickener and (A-1) an anionic surfactant and / or (A-2) an amphoteric surfactant.

[0010] [ka] (In the formula, R represents an alkyl group with 12 to 22 carbon atoms.) [Effects of the Invention]

[0011] The fatty acid amidoamine of the present invention, when used in cleaning compositions, is thought to promote the elongation of string-like micelles, resulting in an increase in viscosity. Furthermore, because it is liquid at room temperature, it exhibits excellent solubility during the manufacture of shampoos and other products, as well as low-temperature stability. [Modes for carrying out the invention]

[0012] Embodiments of the present invention will be described below. In the present invention, the alkyl group of the fatty acid amidoamine represented by general formula (1), which functions as a thickening agent, is a fatty acid having 12 to 22 carbon atoms, with fatty acids having 14 to 22 carbon atoms being preferred. Furthermore, fatty acids without double bonds are more preferred. Moreover, branched-chain fatty acids are even more preferred for the alkyl group. Examples include isostearic acid, 2-hexyldecanoic acid, isopalmitic acid, and isomyristic acid.

[0013] <Cleaning composition> The cleaning composition of the present invention contains (A-1) an anionic surfactant and / or (A-2) an amphoteric surfactant, and (B) a thickening agent comprising a fatty acid amidoamine represented by general formula (1).

[0014] The component (A-1) anionic surfactant incorporated into the thickening agent and cleaning composition of the present invention is not particularly limited, but can be selected from N-acyl amino acid salts, alkyl ether carboxylates, α-olefin sulfonates, alkyl sulfosuccinates, acyl isethionates, N-acyl-N-methyl taurate salts, alkyl sulfate esters, alkyl ether sulfate esters, and combinations thereof.

[0015] The content of component (A-1) in the cleaning composition is 1 to 20% by mass, preferably 3 to 15% by mass, and more preferably 5 to 10% by mass.

[0016] The component (A-2) amphoteric surfactant incorporated into the thickening agent and cleaning composition of the present invention is not particularly limited, but can be selected from alkyl amino acid salts, alkyldimethylaminoacetic acid betaine, alkyldimethylaminosulfobetaine, and combinations thereof.

[0017] The content of component (A-2) in the cleaning composition is 1 to 20% by mass, preferably 3 to 15% by mass, and more preferably 5 to 10% by mass.

[0018] The content of the thickener composed of the fatty acid amide amine represented by the general formula (1) in the component (B) in the cleaning composition is 0.1 to 10% by mass, more preferably 0.2 to 2% by mass.

[0019] The dosage form of the cleaning composition of the present invention is not particularly limited, and examples include hair cleaning compositions such as shampoos, and body cleaning compositions such as body soaps and hand soaps. Among them, hair cleaning compositions are preferred.

[0020] The cleaning composition of the present invention can contain components other than surfactants. For example, water, solvents, fragrances, dyes, preservatives, moisturizers, antibacterial agents, anti-dandruff agents, pearlescent agents, vitamin agents, thickeners other than the product of the present invention, pH adjusters, bleaching agents, chelating agents, water-soluble salts, and oil agents can be mentioned.

[0021] Examples will be given below to explain the product of the present invention more specifically, but the present invention is not limited thereto. Also, the mass% shown below means the mass% with respect to the entire composition.

Examples

[0022] 1. Evaluation of the thickening property of shampoos using various amino acid-based surfactants (Preparation of shampoo) The shampoos shown in Examples 1 to 6 described in Table 1 were prepared, and viscosity measurement and appearance evaluation were carried out. Isostearamide propyldimethylamine was blended at a concentration of 3% by mass as a 1-equivalent citric acid neutral salt. For comparison, shampoos shown in Comparative Examples 1 to 12 described in Table 2 were prepared using cocamide DEA and laureth-2, which are nonionic surfactants used as shampoo thickeners, and the same evaluation was performed.

[0023] (Viscosity measurement) The viscosity was measured at 25°C using a B-type viscometer (product name: VISCOMETER TVB-10, manufactured by Toki Sangyo Co., Ltd.).

[0024] (Appearance evaluation) The state of the shampoo on the day after preparation was observed and evaluated in the following three stages. 〇 Colorless and transparent state △ Colored and transparent state × Condition with cloudiness and crystal precipitation.

[0025] (Evaluation results) The results in Tables 1 and 2 confirm that the cleaning composition containing the thickening agent of the present invention is transparent and has high viscosity.

[0026] [Table 1]

[0027] [Table 2]

[0028] 2. Evaluation of the thickening properties of shampoos using cationic surfactants as thickening agents. (Shampoo preparation) The shampoos shown in Example 7 in Table 3 were prepared, and viscosity measurements, appearance evaluations, and storage stability evaluations at -5°C were performed. For comparison, shampoos shown in Comparative Examples 13 to 16 were prepared using cocamide DEA and laureth-2, which are nonionic surfactants used as shampoo thickeners, and dimer dilinoleate linoleamidopropyl dimethylamine and steartrimonium chloride, which are cationic surfactants, and were evaluated in the same manner. The fatty acid amidoamine was added at a concentration of 3% by mass as the neutralized salt of citric acid by 1 equivalent.

[0029] (viscosity measurement) Viscosity was measured at 25°C using a Type B viscometer (product name: VISCOMETER TVB-10, manufactured by Toki Sangyo Co., Ltd.).

[0030] (Appearance evaluation) The condition of the shampoo was observed the day after preparation and evaluated in the following two stages. 〇 Colorless and transparent state △ Colored and transparent state × Condition with cloudiness and crystal precipitation.

[0031] (Storage stability test at -5°C) After storing the shampoo at -5°C for 3 months, viscosity measurements were taken, and the appearance was evaluated immediately after removal from the constant temperature bath.

[0032] (Evaluation results) The results in Table 3 confirm that the cleaning composition containing the thickening agent of the present invention is transparent and has high viscosity. Furthermore, stability tests at -5°C for 3 months demonstrated excellent low-temperature stability.

[0033] [Table 3]

[0034] 3. Evaluation of the thickening properties of cleaning compositions using nonionic thickeners. (Shampoo preparation) The shampoos shown in Examples 8 and 9 in Table 4 were prepared, and viscosity measurements, appearance evaluations, and storage stability evaluations at -5°C were performed. For comparison, the shampoos shown in Comparative Examples 17 and 18, which do not contain the present invention, were prepared and evaluated in the same manner.

[0035] (viscosity measurement) Viscosity was measured at 25°C using a Type B viscometer (product name: VISCOMETER TVB-10, manufactured by Toki Sangyo Co., Ltd.).

[0036] (Appearance evaluation) The condition of the shampoo was observed the day after preparation and evaluated in the following two stages. 〇 Colorless and transparent state △ Colored and transparent state × Condition with cloudiness and crystal precipitation.

[0037] (Storage stability test at -5°C) After storing the shampoo at -5°C for 3 months, viscosity measurements were taken, and the appearance was evaluated immediately after removal from the constant temperature bath.

[0038] (Evaluation results) The results in Table 4 confirm that the cleaning composition containing the thickening agent of the present invention remains transparent and exhibits high viscosity even when used in combination with other thickening agents (PG laurate). Furthermore, stability tests conducted at -5°C for 3 months demonstrated excellent low-temperature stability.

[0039] [Table 4]

[0040] (Example 10) Shampoo (Formulation) Mass % A water remainder Polyquaternium-10 0.5 Isostearamidopropyldimethylamine 0.5 Sodium benzoate 0.6 Citric acid (10% aqueous solution) 1.0 Sodium citrate (1% aqueous solution) 1.0 Cocamidopropyl betaine 20.0 B. Sodium Cocoyl Methyl Taurate 20.0 C Lauric acid PG 2.0 Fragrance 0.5 (Preparation method) Add phase A to phase B at 80°C and mix. Allow to cool slowly at room temperature. Add phase C at 50°C or below and mix until homogeneous to complete the preparation. [Industrial applicability]

[0041] The cleaning composition containing the thickening agent (fatty acid amidoamine) of the present invention has excellent viscosity and low-temperature stability, making it a significant industrial contribution.

Claims

1. A thickening agent comprising a fatty acid amidoamine represented by general formula (1). 【Chemistry 1】 (In the formula, R represents an alkyl group having 12 to 22 carbon atoms.)

2. The thickening agent according to claim 1, characterized in that the alkyl group of the general formula (1) does not have a double bond.

3. The thickening agent according to claims 1 and 2, characterized in that the alkyl group of the general formula (1) has a branched structure.

4. A cleaning composition comprising (A-1) an anionic surfactant and / or (A-2) an amphoteric surfactant, and (B) a thickening agent comprising a fatty acid amidoamine as described in claim 1 or 2.

5. A cleaning composition comprising (A-1) an anionic surfactant and / or (A-2) an amphoteric surfactant, and (B) a thickening agent comprising the fatty acid amidoamine described in claim 3.

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