JPH0356279B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a liquid detergent composition that is less irritating to the skin, has high microbial degradability, and has sufficiently satisfactory performance such as foaming power and detergent power. Performances generally required for household liquid detergents include excellent foaming power, detergency, microbial degradability, and low irritation to the skin. As surfactants conventionally used for this purpose, alkylbenzene sulfonates, higher alcohol sulfate ester salts, polyoxyethylene higher alcohol sulfate ester salts, alkanesulfonate salts, and the like are widely used as main agents. However, although all of these surfactants are satisfactory in terms of foaming power, detergency, and other performance as household cleaning agents, they have poor microbial degradability and
And in terms of low irritation to the skin,
It was not possible to simultaneously satisfy these two requirements. On the other hand, in recent years, attempts have been made to create cleaning agents based on fatty acid soaps, glyceryl fatty acid monoesters, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyethylene glycol fatty acid esters, sucrose fatty acid esters, and the like. However, when these surfactants are used as the main ingredient, although they are excellent in terms of microbial degradability and low irritation to the skin, their foaming power and cleaning power during use are extremely low, making them unsatisfactory. It becomes something that cannot be done. Higher fatty acid monoalkylolamide ethylene oxide adducts with an average number of added moles of ethylene oxide of 1 to 4 moles are important substances as additives for light or heavy detergents or shampoos, and are used for these purposes. In some cases, they are often used in combination with main detergents such as alkylbenzene sulfonates and higher alcohol sulfate esters to improve the viscosity of the detergent composition and stabilize foam during use. Since this nonionic surfactant has the property of being difficult to decompose even under acidic conditions, it is blended as an additive in weakly acidic light detergents or weakly acidic shampoos. On the other hand, when the number of moles of ethylene oxide added is large, it is blended into a liquid heavy detergent and used as a solubilizer for the main detergent in an atmosphere with a high concentration of inorganic salts. Furthermore, since this nonionic surfactant has excellent dispersibility in lime soap, it has been incorporated into fatty acid laundry soaps for the purpose of improving their hard water resistance. However, higher fatty acid monoalkylolamide ethylene oxide adducts in which the average number of moles of ethylene oxide added is 1 to 4 moles have not been used as the main detergent for household cleaners (kitchen use). The reason is that higher fatty acid monoalkylolamide ethylene oxide adducts with an average number of added moles of ethylene oxide of 1 to 4 moles are
The high price and low water solubility are thought to be major causes. However, as shown in Table 1, this nonionic surfactant has excellent microbial decomposition properties and low irritation to the skin. It can be seen that the performance is far superior to surfactants used as main ingredients in cleaning agents.

【table】

[Table] The present inventors have conducted intensive research into a household cleaning agent that satisfies all of the following properties: microbial degradability, low irritation to the skin, good foaming and cleaning power, and occlusion resistance. A cleaning product that satisfies all of the above-mentioned performance requirements by using a monoalkylolamide ethylene oxide adduct with an average added mole of ethylene oxide of 1 to 4 moles as the main ingredient, and using a small amount of a water-soluble surfactant in combination. The present inventors have discovered that an agent can be obtained, and have completed the present invention. That is, in the present invention, carbon water having an average number of added moles of ethylene oxide of 1 to 4 moles is 8 to 18
The main component is a higher fatty acid monoalkylolamide ethylene oxide adduct, and additives are added to improve the water solubility of this nonionic surfactant, which has foaming power, detergency, and cold resistance. The present invention relates to a household liquid cleaning composition that is particularly excellent in terms of microbial degradability, low irritation to the skin, and the like. The higher fatty acids constituting the higher fatty acid monoalkylolamide ethylene oxide adduct used in the present invention are saturated or unsaturated fatty acids with a carbon water content of 8 to 18, and are classified into natural fatty acids and synthetic fatty acids.
It may also be a mixture of these. However, in order to take advantage of the features of the present invention, among these fatty acids, it is desirable to use a fatty acid mainly consisting of coconut oil fatty acid or lauric acid. The reason for this is that when fatty acids with 8 to 10 carbon atoms increase, water solubility improves, but detergency and foaming power are impaired, and when fatty acids with 16 to 18 carbon atoms increase, water solubility decreases. This is because a large amount of additives are required to improve water solubility. The average number of added moles of ethylene oxide used in the present invention is 1 to 4 moles, and mixtures thereof may also be used. When the average number of moles of ethylene oxide added is 5 moles or more, the water solubility improves, but the detergency decreases. In the liquid detergent composition of the present invention, the water-soluble surfactant used to improve the water solubility of the higher fatty acid monoalkylolamide ethylene oxide adduct having an average number of added moles of ethylene oxide of 1 to 4 moles includes There are the following compounds. Namely, water-soluble salts of higher fatty acids, water-soluble salts of polyoxyethylene higher alcohol sulfuric esters, water-soluble salts of α-olefin sulfonic acid, water-soluble N-long chain acylamino acids such as acylsarcosine, acyl-β-alanine, and acylglutamic acid. These substances, such as amphoteric salts and water-soluble betaine-type amphoteric surfactants, are preferred as additives for the detergent composition of the present invention because they cause little or no irritation to the skin. In addition, higher alcohol sulfate ester salts, alkylbenzene sulfonates, etc. are also used, but since these are highly irritating to the skin, for the purpose of the present invention, the amount added should be determined so as not to impair hypoallergenicity and good microbial decomposition. must be kept within a certain range. The weight ratio of the higher fatty acid monoalkylolamide ethylene oxide adduct having an average added mole number of 1 to 4 moles of ethylene oxide used in the present invention and the other surfactant must be 1:1 to 9:1. It is. If the ratio of the higher fatty acid monoalkylolamide ethylene oxide adduct with an average number of added moles of ethylene oxide of 1 to 4 moles is higher than this, the cleaning power as a liquid detergent will decrease, and if this ratio is lower than this, the cleaning power of the liquid cleaning agent will be reduced. However, the inherent properties of other water-soluble surfactants that are used in combination, such as skin irritation and low detergency, may have adverse effects. The product of the present invention can contain additives commonly used in liquid detergents such as ethanol, glycerin, propylene glycol, urea, fragrances, dyes, and inorganic or organic builders. In this way, a higher fatty acid monoalkylolamide ethylene oxide adduct having an average number of added moles of ethylene oxide of 1 to 4 moles is used as a main ingredient,
To obtain a household liquid detergent that has excellent foaming power, detergency, and microbial degradability and is less irritating to the skin by incorporating a small amount of water-soluble surfactant to improve its water solubility. I can do it. The present invention will be explained in detail below with reference to Examples. Examples 1 to 3, Comparative Examples 1 to 3 Coconut oil fatty acid monoethanolamide ethylene oxide 2 mole adduct (hereinafter abbreviated as CME-2EO)
were blended in the proportions shown in Table 2 by weight, and a test solution was prepared so that the total concentration of surfactants was 0.05%, and a detergency test was conducted. The detergency test was conducted in accordance with the JISK-3370 detergency evaluation method. The results are shown in Table 2.

[Table] Examples 4 to 5, Comparative Examples 4 to 5 Coconut oil fatty acid monoethanolamide ethylene oxide 4 mole adduct (hereinafter abbreviated as CME-4EO),
Alternatively, 5 mole adduct of coconut oil fatty acid monoethanolamide ethylene oxide (hereinafter abbreviated as CME-5EO) and coconut oil fatty acid potassium salt are added in a weight ratio of 3.
They were blended in the proportions shown in the table and a detergency test was conducted in the same manner as in Examples 1 to 3. The results are shown in Table 3.

[Table] Examples 6 to 8, Comparative Examples 6 to 9 CME-2EO and a surfactant for improving its water solubility were blended in the weight ratio shown in Table 4, and the total concentration of surfactant was A test liquid was prepared so that the amount of water was 0.03%, and the detergency was evaluated using the same test method as in Examples 1 to 3. The results are shown in Table 4.

[Table] (7) 2-Alkyl-N-carboxymethyl-N-
Hydroxyethylimidazolinium betaine sodium salt (8) Sodium lauryl ether sulfate (9) Sodium lauryl sulfate Example 9 ΓCME-2EO 22 Γ2-Alkyl-N-carboxymethyl-N-
Hydroxyethylimidazolinium betaine 10 Γcitric acid Appropriate amount (PH7.0) Γwater Total remaining 100% Example 10 ΓCME−2EO 18 ΓCME−4EO 7 ΓN-cocoyl-L-glutamic acid triethanolamine 6 Γcitric acid Appropriate amount (PH7.0) Γ Water Total remaining 100% Example 11 ΓCME−4EO 25 Sodium lauryl ether sulfate 6 Γ Citric acid Appropriate amount (PH 7.0) Γ Water Total remaining 100% Example 9~ When the 11 liquid detergents were left at 0°C for 24 hours, all of them maintained a clear liquid state. Next, a test solution was prepared by dissolving 1.5 g (standard usage amount) of the liquid cleaning agents of Examples 9 to 11 and the commercially available cleaning agents of Comparative Examples 10 to 12 shown in Table 5 in water with a hardness of 3DH. The detergency was evaluated using the same test method as in Examples 1 to 3. The results are shown in Table 5.

[Table] From the results, it was found that the product of the present invention has a cleaning power equal to or higher than that of currently commercially available household liquid cleaning agents. The liquid detergents of Examples 9 to 11 were also used for dishwashing at home. As a result, all of these were evaluated to have the same performance as commercially available kitchen cleaners in terms of detergency and foaming properties.

Claims (1)

[Claims] 1. A higher fatty acid monoalkylolamide ethylene oxide adduct with an average added mole number of ethylene oxide of 1 to 4 moles, and a higher fatty acid water-soluble salt,
Polyoxyethylene higher alcohol sulfate ester water-soluble salt Higher alcohol sulfate ester water-soluble salt,
α-olefin sulfonic acid water-soluble salt, linear alkylbenzene sulfonic acid water-soluble salt, higher alcohol phosphate ester water-soluble salt, polyoxyethylene higher alcohol phosphate ester water-soluble salt, water-soluble betaine type amphoteric surfactant and N - One or more surfactants selected from long-chain acylamino acid water-soluble salts as an essential component, in a weight ratio of 1:1.
A liquid cleaning composition characterized by having a ratio of 9:1 to 9:1.