JP2003119500A - Cleanser composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cleanser composition which contains a carboxymethylated polyoxyethylene alkyl ether and has improved temporal stability, especially improved temporal stability at a low temperature (<=0 deg.C). SOLUTION: This cleanser composition is characterized by comprising (a) the carboxymethylated polyoxyethylene alkyl ether represented by the formula 1: RO(CH2 CH2 O)n CH2 COOM [R is an 8 to 18C alkyl; (n) is an average repeating number of 1 to 5; M is H, an alkali metal cation, an alkaline earth metal cation, ammonium cation, or a lower alkanolamine cation], (b) a hydroxycarboxylic acid or its salt, and (c) the sulfate or chloride of an alkali metal or alkaline earth metal, wherein a (a):(b)+(c) weight ratio is 99:1 to 85:15, and a (b):(c) weight ratio is 99:1 to 10:90.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mild detergent composition for hair, body, textiles, kitchen, etc., which has excellent stability.

[0002]

BACKGROUND OF THE INVENTION JP-A-61-211199 and JP-B-7-94674 describe a cleaning composition containing a carboxymethylated polyoxyethylene alkyl ether or a salt thereof.

Carboxymethylated polyoxyalkylene alkyl ethers or salts thereof have a clear solution when stored alone or in combination with other anionic, cationic, nonionic or amphoteric surfactants in the form of an aqueous solution. It has a defect that it decreases with time and becomes cloudy or gelled. Since such a phenomenon impairs the commercial value of the product, the room temperature (2
There is a demand for a detergent composition containing a carboxymethylated polyoxyethylene alkyl ether having excellent stability, which is transparent at a low temperature (0 ° C. <) as well as at a low temperature (0 ° C. <) for a long time.

[0004]

The present invention comprises: (a) Formula 1: RO (CH ₂ CH ₂ O) _n CH ₂ COOM (wherein R is an alkyl group having 8 to 18 carbon atoms, and n is an average value). Represents a hydrogen atom, an alkali metal cation, an alkaline earth metal cation, an ammonium cation or a lower alkanolamine cation, and M is a carboxymethylated polyoxyethylene alkyl ether, ( b) hydroxycarboxylic acid or salt thereof, and (c) alkali metal or alkaline earth metal sulfate or chloride, and (a): (b)
The weight ratio of + (c) is 99: 1 to 85:15,
There is provided a detergent composition, wherein the weight ratio of (b) :( c) is 99: 1 to 10:90.

The cleaning composition of the present invention retains its transparency even when stored alone or in the presence of another surfactant for a long time as an aqueous solution, and does not have the drawbacks found in conventional cleaning compositions. .

[0006]

Preferred Embodiment A carboxymethylated polyoxyethylene alkyl ether (a) having the formula 1 has the formula 2
By adding a predetermined number of moles of ethylene oxide to the corresponding higher alcohol of ROH (R is the same as above) to produce a polyoxyalkylene alkyl ether, and then reacting it with monochloroacetic acid or a salt thereof in the presence of an alkali, for example. It can be manufactured.

As the higher alcohol of the formula 2, higher alcohols derived from natural fats and oils such as palm oil, coconut oil and beef tallow, higher alcohols produced by starting from 2-ethylhexanol and straight chain paraffin, and Ziegler using ethylene as a raw material. Synthetic higher alcohols such as higher alcohols synthesized by the method are used. Higher alcohols having 12 to 14 carbon atoms are preferable.

The average number of moles of ethylene oxide added per mole of higher alcohol is 1 to 5 moles, preferably 2 to 5 moles. The polyoxyalkylene alkyl ether before carboxymethylation may contain unreacted, that is, the higher alcohol of the formula 2, but the amount thereof is 8% by weight or less based on the whole polyoxyalkylene alkyl ether before carboxymethylation. Is preferred. This is because such an amount does not adversely affect the storage stability of the composition.

The polyoxyethylene alkyl ether having an unreacted higher alcohol content of 8% by weight or less can be added to the higher alcohol in a predetermined amount in the presence of a basic catalyst such as sodium hydroxide, potassium hydroxide or sodium methoxide by a conventional method. It can be obtained by adding ethylene oxide of 1) and distilling off the unreacted higher alcohol under reduced pressure. Instead of the addition reaction of ethylene oxide, for example Al
It can also be obtained by using a composite metal oxide such as —Mg-based composite oxide, calcined hydrotalcite, or a metal halide such as indium halide or antimony halide as a catalyst.

Carboxymethylation can be carried out by reaction with monochloroacetic acid or its salts in the presence of alkali. Alternatively, carboxymethylation can be carried out by oxidizing polyoxyethylene alkyl ether with an oxygen-containing gas in the presence of a noble metal catalyst such as platinum or palladium.

The stability of the detergent composition is further enhanced by the presence of an appropriate amount of hydroxycarboxylic acid or salt thereof (b) and an alkali metal or alkaline earth metal sulfate or chloride (c). Particularly, it is effective for preventing clouding or gelation at low temperature (0 ° C. <).

Specific examples of the hydroxycarboxylic acid which can be used are glycolic acid, lactic acid, malic acid, citric acid, tartaric acid and the like, and the salts thereof are sodium salt, potassium salt,
Water-soluble salts such as ammonium salts and lower alkanolamine salts. Examples of alkali metal sulfates include sodium sulfate and potassium sulfate, and examples of alkali metal chlorides include sodium chloride and potassium chloride.

Alkaline earth metal salts of hydroxycarboxylic acids, sulfates or chlorides of alkaline earth metals are also water-soluble, and the components (b) and (c) react with each other in water. It can be used as long as it does not form a sparingly water-soluble salt. For example, barium ion reacts with sulfate ion to form barium sulfate precipitate, calcium ion reacts with sulfate ion or citrate ion to form precipitate, and magnesium ion reacts with citrate ion to slightly add to water. A precipitate of only soluble magnesium citrate is formed. However, for example, the combination of magnesium lactate and magnesium sulfate does not produce a precipitate.

The proportions of the components (a), (b) and (c) contained in the detergent composition of the present invention are as follows:
The weight ratio of (b) + (c) is within the range of 99: 1 to 85:15, and the weight ratio of (b) :( c) is 99: 1 to 1
It is within the range of 0:90, preferably 95: 5 to 15:85, and most preferably 95: 5 to 20:80. If the amount of component (a) in the composition is low, the detergency per unit weight will decrease, and if the ratio of (b) + (c) is too low, there will be no stabilizing effect, and if the ratio of (b) + (c) is This is because the ratio is a range in which the two exert a synergistic stabilizing effect.

The detergent composition of the present invention can be used in, for example, skin detergents such as body shampoos and facial cleansers, hair shampoos, kitchen detergents, laundry detergents and the like. The composition is usually supplied in the form of an aqueous solution, and other surfactants can be used in combination for the purpose of adjusting viscosity, enhancing foamability, etc. depending on the application.

As the surfactant which can be used in combination with the cleaning composition of the present invention, one or more kinds of anionic, cationic, amphoteric or nonionic surfactant can be used. As anionic, alkyl sulfate ester salt, polyoxyethylene alkyl ether sulfate ester salt, alkylbenzene sulfonate, higher fatty acid salt, α-olefin sulfonate,
Alkyl sulfonate, N-alkanoyl ethanolamide sulfate, fatty acid glyceride sulfate, alkyl glyceryl ether sulfate, alkyl phosphate, alkyl ether phosphate, alkyl amide ether carboxylate, sulfosuccinate ester surfactant , Taurine-based surfactants, sarcosine-based surfactants, isethionate-based surfactants, N-acyl acidic amino acid-based surfactants, and the like. Examples of the cationic agent include alkyl trimethyl ammonium chloride and dialkyl dimethyl ammonium chloride. Examples of the amphoteric include betaine-based or imidazoline-based, sulfobetaine-based, and amine oxide-based, and nonionics include polyoxyethylene alkyl ether, polyoxyethylene fatty acid ester, fatty acid monoglyceride, fatty acid sorbitan ester, and alkyl polyglycoside. . These surfactants may be used alone or as a mixture of several kinds.

In addition to the above components, moisturizers such as propylene glycol and glycerin, organic acids, dyes,
Auxiliary components depending on the application such as fragrances, preservatives, chelating agents, and ultraviolet absorbers can be included.

[0018]

The following examples are for illustration purposes only and should not be construed as limiting the invention. Parts and% in the examples and comparative examples are by weight unless otherwise specified.

Examples 1-10 and Comparative Examples 1-6 An aqueous solution containing the components (a), (b) and (c) shown in Tables 1 and 2 at the specified concentrations was prepared and the following method was used. Was evaluated for stability and compatibility.

(1) Stability over time A sample was taken in a 100 ml screw type test tube, left in a thermostat at 0 ° C and 25 ° C for 2 weeks, and visually evaluated for appearance. ◯: Transparent liquid x: White turbidity or gel precipitation (2) Compatibility A detergent aqueous solution of the present invention 20% (nonvolatile matter equivalent) and coconut oil fatty acid diethanolamide 6% are included, and the balance is an aqueous solution of purified water as a sample, This was put into a 100 ml screw type test tube, left for 2 weeks in a constant temperature bath at 0 ° C., and visually evaluated for appearance. ◯: Transparent liquid x: White turbidity (3) Unreacted alcohol content The content of unreacted alcohol in the polyoxyethylene alkyl ether before carboxymethylation was measured by a conventional method.

The results are shown in Tables 1 and 2. Note that (a)
The alkyl group of the component is represented by the number of carbon atoms or the derived fat component.

[0022]

[Table 1]

[0023]

[Table 2]

As shown in Tables 1 and 2, the detergent compositions of Examples are all satisfactory in stability and compatibility with time, but do not contain one or both of the component (b) and the component (c). The compositions of Comparative Examples 1-2 and 4-6 lack stability over time at least at low temperatures (0 ° C.), and the compositions of Comparative Examples 1-3 in which the unreacted alcohol content exceeds 7% It lacks solubility, and in this case the compatibility is not improved even if the components (b) and (c) are added as in Comparative Example 3.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C11D 3/386 C11D 3/386

Claims (2)

[Claims] 1. (a) Formula 1: RO (CH ₂ CH ₂ O) _n CH ₂ COOM (wherein R is an alkyl group having 8 to 18 carbon atoms, and n is a repeating number having an average value of 1 to 5). , M means a hydrogen atom, an alkali metal cation, an alkaline earth metal cation, an ammonium cation or a lower alkanolamine cation), and (b) a hydroxycarboxylic acid or a salt thereof. And (c) an alkali metal or alkaline earth metal sulfate or chloride, wherein the weight ratio of (a) :( b) + (c) is 99: 1 to 85: 1.
5, and the weight ratio of (b) :( c) is 99: 1 to 10 :.
90 is a cleaning composition. 2. The polyoxyethylene alkyl ether corresponding to the component (a) before carboxymethylation has 8 carbon atoms.
The cleaning composition according to claim 1, which does not contain 8 to 18% by weight of the higher alcohol of -18.