JPH11189797A - Liquid detergent composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject composition having mild irritation to skin and high mildness, excellent in detergency and good even in low-temperature stability by formulating an N-alkylamino acid with an anionic surfactant and a specific ingredient. SOLUTION: This composition contains (A) an N-alkylamino acid represented by the formula; RNH(CH2 )m COOM [R is a straight-chain or a branched 5-21C alkyl or alkenyl; (m) is 1-2; M is hydrogen, an alkali metal ion or the like] or its salt (e.g. an N-alkylglycine), (B) an anionic surfactant (preferably an alkyl sulfuric salt or the like) and (C) 0.5-15 wt.% of a compound selected from an aromatic carboxylic acid (e.g. benzoic acid) and its salt and an aromatic sulfonic acid (e.g. toluenesulfonic acid) and its salt as a hydrotropic agent capable of improving the low-temperature stability of the ingredient A. The ingredients A and B are preferably formulated in respective amounts of >=1 wt.% and in (10:90) to (90:10) ratio expressed in terms of weight ratio.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compact type cleaning composition which is extremely useful as a cleaning agent for hard surfaces such as kitchen and a cleaning agent for body or hair. The present invention relates to a detergent composition which is mild and has high mildness, and also has excellent detergency, and is excellent in storage stability at low temperatures.

[0002]

2. Description of the Related Art In recent years, liquid detergents for kitchens and liquid detergents for the body or hair have become mainly of compact type, which gives great advantages to consumers and distributors.

Conventionally, the surfactants incorporated in these detergent compositions have been developed with anionic surfactants as the center because they have excellent cleaning performance, but these have been developed as kitchen detergents. There was a problem in that it caused rough hands when used. Therefore, in order to solve the above-mentioned problems, a recent detergent composition has been proposed and put into practical use in which an anionic surfactant and an amine oxide are used in combination. However, in the present day when the detergent for kitchen is made compact and the concentration of the surfactant in the detergent which is directly touched is increased, further improvement of mildness is required again.

As a detergent composition having further improved mildness, it has been proposed to use an amphoteric activator such as amidopropyl betaine having high mildness in combination. The force was insufficient (for example, JP-A-4-253943, JP-A-6-116596 and JP-A-7-62388). In particular, the detergency against oil stains attached to hydrophobic hard surfaces such as tappers is extremely poor, and it has not been very satisfactory in view of the recent lifestyle.

Therefore, in recent years, there has been a strong demand for the development of a detergent composition having mild mild irritation to the skin and high mildness, and having excellent detergency. As one of the surfactants that can satisfy such requirements, the applicant of the present invention has found that N-alkylamino acids having a specific structure are useful. However, since N-alkylamino acids have poor detergency alone and have extremely high crystallinity, when they are blended as a main component of a detergent, they have poor low-temperature storage stability and cause precipitates, cloudiness and solidification. There is a problem in that it tends to occur.

Up to now, as described in JP-A-8-183994 and JP-A-9-3485, alkyl ether sulfates or salts thereof (AE
S), alkyl ether carboxylic acid or its salt (A
It has been reported that a combination of EC) and an alkyl amino acid type active agent can give a composition having less skin irritation, good foaming and high detergency, but no study has been made on stability at low temperature. Is the current situation.

Therefore, in recent years, there has been a strong demand for the development of a detergent composition which is mild to the skin and has a high mildness, is excellent in detergency, and is excellent in low temperature stability.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art and aims to solve the problems.
It is an object of the present invention to provide a cleansing composition having mild mild irritation to the skin, high mildness, excellent detergency and good low temperature stability.

[0009]

Means for Solving the Problems As a result of intensive studies for solving the above problems, the present inventors have found that the purpose of the present invention is to add N-alkylamino acid, an anionic surfactant and a specific component. It was found that the above-mentioned achievement was achieved, and the present invention was completed. That is, the cleaning composition of the present invention is characterized by containing the following components (1) to (3). (1) N-alkyl amino acid represented by the following general formula (I) or a salt thereof (2) anionic surfactant (3) aromatic carboxylic acid and its salt, or aromatic sulfonic acid and its salt 0.5 to 15% by weight of at least one compound selected RNH(CH ₂ ) _m COOM (I) [In the formula (I), R is a linear or branched alkyl group having 5 to 21 carbon atoms. Or an alkenyl group. m is 1
Represents an integer of 2; M is hydrogen atom, alkali metal ion, ammonium, mono-, di- or trialkanol ammonium having an alkanol group having 2 to 3 carbon atoms,
It represents an alkyl group-substituted ammonium having 1 to 5 carbon atoms or a basic amino group. ]

[0010]

[In the formula (I), R is a linear or branched alkyl group or alkenyl group having 5 to 21 carbon atoms. m represents an integer of 1 to 2. M represents a hydrogen atom, an alkali metal ion, ammonium, a mono-, di- or trialkanol ammonium having an alkanol group having 2 to 3 carbon atoms, an alkyl group-substituted ammonium having 1 to 5 carbon atoms, or a basic amino group. ]

In the N-alkylamino acid represented by the above general formula (I) or a salt thereof used in the present invention, R is 5 to 5.
A hydrocarbon group having 21 carbon atoms,
Hydrocarbon radicals having 4 carbon atoms are particularly preferred. The hydrocarbon group R may be linear or branched,
It may be saturated or unsaturated and may optionally contain a substituent such as a hydroxyl group. Preferably, R is a decyl group, a lauryl group, a myristyl group, a palmityl group, an oleyl group, a coconut fatty acid-derived alkyl group, or a tallow fatty acid-derived alkyl group. M in the general formula (I)
Is an integer of 1 to 2, and the case of 2 is particularly preferable. M in the general formula (I) is a hydrogen atom, an alkali metal ion, ammonium, a mono-, di- or trialkanol ammonium having an alkanol group having 2 to 3 carbon atoms, or an alkyl group-substituted ammonium having 1 to 5 carbon atoms. Alternatively, it is a basic amino group, preferably a hydrogen atom, an alkali metal ion, or ammonium.

The N-alkylamino acid represented by the above general formula (I) or a salt thereof is a known compound as can be seen in Cas. No. 3546-96-1, and its production method is particularly limited. Instead, it can be manufactured by a conventionally known method. For example, when m=1, the target N is obtained by reacting an alkylamine with equimolar halogenated acetic acid.
An alkylglycine is obtained. When m=2,
The desired N-alkyl β-alanine can be obtained by adding an equimolar amount of acrylic acid to an alkyl amine. Specific examples of the N-alkylamino acid represented by the general formula (I) include N-decylglycine and its salts, N-laurylglycine and its salts, N-laurylβ-alanine and its salts, and N-myristyl. Examples include, but are not limited to, glycine and its salts, N-myristyl β-alanine and its salts, N-palmityl β-alanine and its salts, N-cocoyl β-alanine and its salts, and the like.

On the other hand, the detergent composition of the present invention contains an anionic surfactant as an essential component. The anionic surfactant used in the present invention is a surfactant that has been conventionally used for detergents and the like. Examples of the anionic surfactant include alkyl sulfates, linear alkylbenzene sulfonates, polyoxyethylene alkyl sulfates, alkyl phosphates, α-olefin sulfonates, α-sulfo fatty acid methyl esters, alkane sulfonates. , Sulfosuccinate, acyl amino acid salt, long-chain fatty acid salt, and the like, but are not limited thereto. The anionic surfactant in the present invention plays a role of exhibiting higher detergency by interacting with the above-mentioned N-alkylamino acid compound.
Therefore, among the various anionic surfactants described above, it is particularly preferable to use an alkyl sulfate, a linear alkylbenzene sulfonate, a polyoxyethylene alkyl sulfate, or an α-olefin sulfonate, which has a stronger interaction.

The blending amount and blending ratio of the N-alkylamino acid represented by the above general formula (I) or a salt thereof and the anionic activator in the detergent composition of the present invention are not particularly limited. However, it is preferable that each blending amount is 1 wt% or more with respect to the total amount of the composition, and it is desirable that the blending amount is in the range of 1:99 to 99:1 by weight. , And more preferably 10:9
It is desirable that the content is in the range of 0 to 90:10. In this range of weight ratio, even higher detergency can be exhibited.

The detergent composition of the present invention further contains, as an essential component, at least one compound selected from aromatic carboxylic acids and salts thereof, or aromatic sulfonic acids and salts thereof. As the aromatic carboxylic acid, for example,
Benzoic acid, salicylic acid or salts thereof, and the like,
Examples of the aromatic sulfonic acid include toluene sulfonic acid, xylene sulfonic acid, cumene sulfonic acid and salts thereof, and these can be used alone or in combination.

These compounds have a role as a hydrotrope which most effectively improves the low temperature stability of N-alkyl amino acids or salts thereof. The blending amount of at least one compound selected from the aromatic carboxylic acids and salts thereof, or the aromatic carboxylic acids and salts thereof,
It is 0.5 to 15% by weight, preferably 1 to 10% by weight. If the blending amount is less than 0.5% by weight, the hydrotrope effect is insufficient and the low temperature stability becomes poor. on the other hand,
If it exceeds 15% by weight, skin irritation may occur, which is not preferable.

In addition, the detergent composition of the present invention may contain other conventionally used nonionic surfactants, amphoteric surfactants, and other additives within a range that does not impair the effects of the present invention. May be used in any combination. Preferred mixable nonionic surfactants include, for example, polyoxyethylene alkyl ether, sorbitan fatty acid ester, polyoxyethylene acyl ester, alkyl polyglycoside, fatty acid glycoside ester, fatty acid methyl glycoside ester, alkyl methyl glucamide, amine. Examples thereof include oxides and fatty acid alkanolamides. Preferred amphoteric surfactants that can be added include, for example, alkyl betaine, alkyl hydroxysulfobetaine, alkylamido betaine, imidazolinium betaine and the like. These surfactants can be blended alone or in an appropriate combination of two or more kinds.

The above general formula (I) which is an essential component of the present invention
The N-alkylamino acid represented by or a salt thereof, an anionic activator and the like are dissolved in a solvent and used as a detergent composition. The solvent is preferably water (purified water), and may further contain other liquid solvent such as lower alcohol and glycol.

Further, in the detergent composition of the present invention, other preferable additive components that can be added are, for example,
Cationic surfactants such as alkylamine hydrochlorides and quaternary ammonium salts, chelating agents such as citric acid, builders such as inorganic salts, viscosity modifiers, colorants, antioxidants, preservatives, bactericides, anti-flame Commonly used substances such as agents, medicinal ingredients and fragrances may be added.

[0020]

EXAMPLES Next, the present invention will be further explained with reference to examples and comparative examples, but the present invention is not limited to these examples.

[Examples 1 to 7, Comparative Examples 1 to 8] Table 1 below
A detergent composition having the composition shown in was prepared and evaluated for skin irritation, detergency and low temperature storage stability by the following test methods. The results are shown in Table 1 below. In addition, the compounding amount in Table 1 is% by weight, and the composition has a pH adjusted to 6.5.

(Skin irritation) Sensory evaluation was carried out by the following method. A 1% aqueous solution of each cleaning composition shown in Table 1 (35
(°C) is an evaluation by a dip test by 10 testers. That is, the immersion-drying operation was performed 15 times every 1 minute, and the degree of rough skin of the hand after 24 hours was visually judged by the following evaluation criteria. Evaluation criteria: ◯: Almost no rough skin △: Signs of hand roughness such as dry desquamation and red spot change are observed on a part of the keratinous surface of the skin ×: Hand dry symptoms such as dry desquamation and red spot change Clearly recognized

(Detergency) 1 g of beef tallow 10 cm×15 cm
Was evenly applied to the tapper container of No. 1 to give a violently soiled hydrophobic surface stain. Take 36 g of water and 4 g of the detergent composition shown in Table 1 on a dishwashing sponge, and after rubbing it several times by hand, wash this contaminated tapper container at 25° C. in the same manner as at home. did. After washing, it was rinsed well with water, and the touch feeling when touching the contaminated surface of the tapper container at that time was evaluated based on the following evaluation criteria. Evaluation criteria: ◯: No matter what part of the tapper container is touched, there is a squeaky frictional sensation and no slimyness due to residual oil is felt. Δ: There is a feeling of friction when touching the smooth surface of the tapper container, and no residual oil is observed, but sliminess remains at the edges and corners. X: Lubricity is felt in the entire tapper container, and it is clear that oil remains.

(Low-temperature storage stability) Each detergent composition shown in Table 1 was filled in a 100 ml glass bottle, stored in a thermostat at -20°C for 1 day and frozen, and then kept in a thermostat at 0°C for 1 day. Repeat the cycle of saving, thawing, and restoring three times, and then
The appearance at 0°C was judged according to the following evaluation criteria. Evaluation criteria: ○: uniformly transparent ×: cloudy or solid

[0025]

[Table 1]

As is clear from the results shown in Table 1, the cleaning compositions of Examples 1 to 7, which are within the scope of the present invention, show excellent mildness, cleaning performance, and low temperature stability. It was found that the cleaning compositions of Comparative Examples 1 to 8 which do not contain any of the essential components or which deviate from the optimum range and which are out of the optimum range are inferior in performance. Looking at the Comparative Examples individually, Comparative Example 1 is the case of the N-alkyl amino acid salt alone blended, Comparative Example 2 is the case of the anionic surfactant alone blended, and Comparative Examples 3 to 5 and 8 are respectively The amount of the hydrotrope agent is outside the range of the present invention (less than and exceeding), Comparative Examples 6 and 7 are the cases where N-alkyl amino acid or its salt is not added, and in these cases, skin irritation is caused. It was found that not all items of detergency and storage stability at low temperature could be satisfied.

[0027]

EFFECTS OF THE INVENTION According to the present invention, there is provided a detergent composition which is mild to the skin and has a high mildness, is excellent in detergency, and is also excellent in low temperature stability. Detergent compositions particularly suitable for hard surfaces such as cleaning agents are provided

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Claims (1)

[Claims] 1. A liquid detergent composition comprising the following components (1) to (3). (1) N-alkyl amino acid represented by the following general formula (I) or a salt thereof (2) anionic surfactant (3) aromatic carboxylic acid and its salt, or aromatic sulfonic acid and its salt 0.5 to 15% by weight of at least one compound selected RNH(CH ₂ ) _m COOM (I) [In the formula (I), R is a linear or branched alkyl group having 5 to 21 carbon atoms. Or an alkenyl group. m is 1
Represents an integer of 2; M is hydrogen atom, alkali metal ion, ammonium, mono-, di- or trialkanol ammonium having an alkanol group having 2 to 3 carbon atoms,
It represents an alkyl group-substituted ammonium having 1 to 5 carbon atoms or a basic amino group. ]