JPH0633091A - Liquid cleaning agent for clothes - Google Patents

Abstract

PURPOSE:To obtain a liquid cleaning agent for clothes, having excellent cleaning power, solubility and rinsing properties, biodegradability and low-temperature stability, suppressing foaming, comprising an alkyl sulfate, a nonionic surfactant, an amphoteric surfactant, etc. CONSTITUTION:(A) One or more alkyl sulfates of the formula R-SO3M (R is 8-18C alkyl or alkenyl; m is an alkali metal, an alkaline earth metal or organic amino) wherein the amount of an alkyl sulfate (e.g. sodium dodecyl sulfate) having an alkyl group in which R is 8C or 10C is >=15wt.% based on the whole alkyl sulfates are blended with (B) a nonionic surfactant (e.g. polyoxyethylene alkyl ether) and/or (C) one or more amphoteric surfactants (e.g. alkyl acetate betaine) to give the objective cleaning agent for clothes, having excellent cleaning power, solubility and rinsing properties, biodegradability and low-temperature stability, suppressing foaming.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid detergent for clothes which is excellent in detergency, solubility, easiness of rinsing, suppresses foaming property, is excellent in biodegradability, and is excellent in low temperature stability. .

[0002]

2. Description of the Related Art Conventionally, an anionic surfactant such as an alkylbenzene sulfonate or an alkyl sulfate has been mainly used as a surfactant used in a detergent for clothes. Further, since the alkylbenzene sulfonate and the alkyl sulfate have poor solubility in water, powdery ones have been mainly used. However, the alkylbenzene sulfonate is not so good in biodegradability, and is not preferable in consideration of the influence of the detergent on the environment. As a result, alkyl sulfates have come to be used more often, and from the viewpoint of the speed of foaming and the amount of foam, those having 12 or 14 carbon atoms have been mainly used as the alkyl group composition of the alkyl sulfates. However, due to the automation of washing machines in recent years, the properties required for laundry detergents have also changed, and it is desired that they cannot be obtained with powder detergents, that they have rapid solubility and rapid rinsing, and that they have low residue on clothing. As a result, laundry detergents have to cope well with changes in social structure. Further, the liquid detergent for clothes has a problem that the detergent power is slightly weaker and the low temperature stability is not so good as compared with the powder detergent.

[0003]

[Means for Solving the Problems] As a result of earnest research aimed at achieving the above technical problems, the present inventors have studied various compositions of various alkyl groups in an alkylsulfate, and found that the number of carbon atoms is 8
Alternatively, an alkyl sulfate having 10 alkyl groups,
When the alkyl sulfate (A) is contained in an amount of 15% by weight or more based on the total alkyl sulfate, and the nonionic surfactant (B) and / or the amphoteric surfactant (C) are contained, it becomes inorganic dirt. Based on this finding, the present invention was found to be excellent in detergency of organic dirt, excellent in low temperature stability as a liquid detergent for clothes, excellent in solubility, easy to rinse, low in foaming property, and excellent in biodegradability. Has been completed.

That is, the present invention has the general formula (1):

[Chemical 2] (In the formula, R represents an alkyl group or an alkenyl group having 8 to 18 carbon atoms, and M represents an alkali metal, an alkaline earth metal, or an organic amino group.), And an alkyl sulfate (A), An alkylsulfate containing one or more selected from nonionic surfactants (B) and / or amphoteric surfactants (C), wherein R is an alkyl group having 8 or 10 carbon atoms. The liquid detergent for clothes is characterized by containing 15% by weight or more based on all alkyl sulfates.

The structure of the present invention will be described in detail below. Examples of the alkyl sulfate (A) used in the present invention include hexyl sulfate (C8), decyl sulfate (C10),
Dodecyl sulfate (C12), tetradecyl sulfate (C1
4), hexadecyl sulfate (C16), heptadecyl sulfate (C18), oleyl sulfate (C18) and the like.
In the present invention, the content composition is important, and the hexyl sulfate (C8) is contained in the total alkyl sulfate (Ctotal).
And decyl sulfate (C10) total content ratio (C8 + C
10 / Ctotal) must be contained in an amount of 15% by weight or more by weight. Further, preferably, the content ratio (C8 +
C10 / Ctotal) is 20% by weight or more, and in this case,
The effect is remarkable. Content ratio (C8 + C10 / Ctotal)
If it is less than 15% by weight, the solubility, the easiness of rinsing and the like are poor. Further, it is more preferable that the content ratio (C14 or more / Ctotal) of the alkylsulfate having a carbon number of tetradecylsulfate (C14) or more to less than 25% by weight based on the total alkylsulfates. When the content ratio (C14 or more / Ctotal) of the alkylsulfate having a carbon number of tetradecyl sulfate (C14) or more with respect to the total alkyl sulfate is 25% by weight or more, (C8 + C10 / Ctotal) is 15% by weight or more. However, the Japanese washing method performed with water at room temperature has poor solubility, resulting in poor detergency, and high residue on clothes, which may result in poor rinseability.

The nonionic surfactant (B) used in the present invention is, for example, polyoxyethylene alkyl ether, polyoxyethylene allyl ether, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene hydrogenated castor oil derivative, sucrose. Fatty acid ester, alkyl polyglucoside, polyoxyethylene fatty acid ester,
Examples thereof include fatty acid alkanolamides and polyoxyethylene polyoxypropylene copolymers. Of these,
Polyoxyethylene alkyl ether and fatty acid alkanolamide are particularly preferable.

Amphoteric surfactant (C) used in the present invention
Examples include alkylamine oxide, betaine alkylacetate, acylamidobetaine, alkylhydroxysulfobetaine, alkylimidazolinium betaine, and the like.

In the present invention, one or more of these nonionic surfactants (B) and / or amphoteric surfactants (C) can be arbitrarily selected and blended.
Further, in the present invention, an alkyl sulfate (A), a nonionic surfactant (B) and / or an amphoteric surfactant (C).
In the case of the combination of the alkylsulfate (A) and the nonionic surfactant (B), the content ratio of and is (A):
(B) is preferably in the range of 2: 1 to 1: 5, and in the combination of the alkyl sulfate (A) and the amphoteric surfactant (C),
The weight ratio (A) :( C) is preferably in the range of 4: 1 to 1: 1. When both the nonionic surfactant (B) and the amphoteric surfactant (C) are contained, it depends on the content ratio of the nonionic surfactant (B) and the amphoteric surfactant (C), Overall, the weight ratio (A) :( B) + (C) is preferably 3: 1 to 1: 3.

When the content ratio of the alkyl sulfate (A) to the nonionic surfactant (B) and / or the amphoteric surfactant (C) is different from the above range, excellent low temperature stability is obtained. And the detergency may be lowered, which is not preferable.

The liquid detergent for clothes of the present invention may optionally contain, in addition to the above-mentioned essential components, other components commonly used in detergents for clothes within a range that does not impair the effects of the present invention. It can be blended appropriately. For example, anionic surfactants such as higher fatty acid salts, α-sulfo fatty acid ester salts, and polyoxyethylene alkyl sulfate ester salts, and softening agents that are cationic surfactants such as alkyltrimethylammonium chloride and dialkylammonium chloride. , Nitrilotriacetic acid salts, ethylenediaminetetraacetic acid salts, polyvalent carboxylic acid salts such as citrates,
Enzymes such as water-soluble chelate builders, proteases, lipases, amylases, cellulases, etc. consisting of polymers such as polyacrylates, polyitaconates, copolymers of olefins and maleic anhydride, copolymers of acrylic acid and maleic anhydride, etc. , Ethanol, metaxylene sulfonate, paratoluene sulfonate, etc., hydrotrope agent, carboxymethyl cellulose, polyethylene glycol, etc., recontamination inhibitor, calcium formate, calcium chloride, etc. enzyme stabilizer, fluorescent agent, fragrance, dye , An antibacterial agent, etc. can be added.

[0011]

EXAMPLES Next, the present invention will be described in more detail by way of examples, but the present invention is not limited to these examples. The blending amount is% by weight. Hereinafter, the effects of the present invention will be specifically described by way of examples, and the test methods used in the examples will be shown prior to this.

(1) Test method for detergency (i) Preparation of artificial dirt The organic dirt composition shown in Table 1 is well mixed and dissolved under heating. Then, Kanto loam, which is an inorganic dirt, and carbon black were added and well stirred in a beaker, then transferred to a mortar and kneaded well to obtain artificial dirt.

[0013]

[Table 1]

(Ii) Preparation of artificial dirt cloth The artificial dirt is thoroughly rubbed with a clean cloth (cotton cloth No. 60 designated by the Japan Oil Chemistry Association) with a sponge so that the reflectance is 40 ± 2%. This was cut into 5 cm x 5 cm to obtain an artificial soiled cloth.

(Iii) Cleaning method and cleaning evaluation method The cleaning device is a Terg-o-Tometer JIS K-3.
317), with 10 pieces of artificial dirt cloth and clean knit
(5 cm × 5 cm) so that the bath ratio is 30 times, and at 120 rpm
Wash for 10 minutes at 40 ° C. Washing with 0.125% detergent 9
Use 00 ml and rinse with 900 ml water for 3 minutes. The water used was tap water. The reflectance of the obtained cleaning cloth was measured, and the cleaning rate was calculated from the following formula. Ro: reflectance of clean cloth Rs: reflectance of dirty cloth Rw: reflectance of dirty cloth after washing The reflectance was measured by a high-precision color difference measuring device (Keihin Denshoku). The detergency was measured as an average value of 10 sheets.

(2) Foaming test

[Chemical 3] Dissolve 0.5g of detergent in 400ml of 70ppm artificial hard water, temperature 40 ℃
Under the conditions, the foamability was measured using a cylindrical cylinder equipped with a stirrer. After stirring was rotated for 10 minutes under a condition of 50 rpm, the height from the water surface to the highest part of the foam was measured.

(3) Low temperature stability test The stability test was carried out by visually observing the prepared detergent at 0 ° C. for 2 weeks for precipitation, crystallization, solidification or separation. The evaluation method was performed in three stages according to the following criteria. ○ ----- Stability is good: No precipitation, crystallization, solidification or separation is seen. △ ----- Slightly good: Precipitation, crystallization or solidification is seen, but even within 30 minutes after returning to room temperature. Return to. × ----- Poor stability ： Precipitation, crystallization, solidification or separation was observed, and it took more than 30 minutes to return to room temperature.

(4) Biodegradability test According to JIS-K0102, a BOD test was conducted using the Tsurumi River as a microbial source, and the degradation rate was calculated from the BOD value after 5 days.

Examples 1 to 6 and Comparative Examples 1 and 2 Liquid phosphorus-free detergent compositions having the following compositions were prepared and their performances were evaluated. The results are shown in Tables 2 and 3. Detergent Composition Composition ───────────────────────────── Sodium alkylsulfate (Note 1) 20 wt% Polyoxyethylene (15 ) Lauryl ether 25 Sodium silicate 10 Triethanolamine citrate 5 Protease 1 Ethanol 5 Sodium metaxylene sulfonate 5 Water Residual ────────────────────────── ──── (Note 1) Details are shown in Tables 2 and 3.

[0020]

[Table 2]

[0021]

[Table 3]

Examples 7 to 14 and Comparative Examples 3 to 7 Liquid phosphorus-free detergent compositions having the following compositions were prepared and their performances were evaluated. The results are shown in Tables 4, 5 and 6. Detergent Composition Composition ───────────────────────────── Sodium alkyl sulfate X (C8: C10: C12 = 3: 3: 4) Nonionic surfactant (Note 2) Y Sodium silicate 10 Triethanolamine citrate 5 Protease 1 Ethanol 5 Sodium metaxylene sulfonate 5 Water Residual ────────────────── ──────────── (Note 2) Details are shown in Tables 4, 5 and 6.

[0023]

[Table 4]

[0024]

[Table 5]

[0025]

[Table 6]

Examples 15 to 19 and Comparative Examples 8 to 10 Liquid phosphorus-free detergent compositions having the following compositions were prepared and their performances were evaluated. The results are shown in Tables 7 and 8. Detergent Composition Composition ───────────────────────────── Sodium alkyl sulfate X (C8: C10: C12 = 3: 3: 4) Amphoteric surfactant (Note 3) Y Sodium silicate 10 Triethanolamine citrate 5 Protease 1 Ethanol 5 Sodium metaxylene sulfonate 5 Water Residue ──────────────────── ─────────── (Note 3) Details are shown in Tables 7 and 8.

[0027]

[Table 7]

[0028]

[Table 8]

Example 20 Liquid detergent for clothes ───────────────────────────── Sodium hexyl sulfate (C8) 6 sodium decyl sulfate (C10) 10 Sodium dodecyl sulfate (C12) 10 POE (12) C12 alkyl ether 15 Oleic acid triethanolamine 8 Sodium silicate 8 Ethanol 5 Sodium metaxylene sulfonate 5 Water Residue ───────────── ─────────────────

Example 21 Liquid detergent for clothes ───────────────────────────── Hexyl sulfate triethanolamine salt (C8) 8 Decyl sulfate triethanolamine salt (C10) 8 Dodecyl sulfate triethanolamine salt (C12) 5 POE (6) C10, C12 alkyl ether 5 POE (20) C10, C12 alkyl ether 10 Laurate triethanolamine 4 Laurylamido betaine 8 Sodium carbonate 8 Ethanol 5 Sodium xylene sulfonate 8 Cellulase 2 Calcium chloride 0.2 Water Residue ──────────────────────────────

Example 22 Liquid detergent for clothes ───────────────────────────── Hexyl sulfate magnesium salt (C8) 3 decyl sulfate Magnesium salt (C10) 5 Dodecyl sulfate magnesium salt (C12) 10 Tetradecyl sulfate magnesium salt (C14) 1 Betaine lauryl acetate 10 POE (20) C10, C12 alkyl ether 5 Coconut fatty acid diethanolamide 3 Zeolite 5 Distearyl ammonium chloride 1 Paratoluene Sodium sulfonate 4 Ethanol 6 Polyethylene glycol 3 Fluorescent brightener 1 Cellulase 2 Water Residual ───────────────────────────────

Example 23 Liquid detergent for clothes ───────────────────────────── Hexyl sulfate triethanolamine salt (C8) 8 Decylsulfate triethanolamine salt (C10) 10 Dodecylsulfate triethanolamine salt (C12) 5 POE (4) C18 branched alkyl ether 8 POE (18) C18 branched alkyl ether 8 myristinic triethanolamine 4 lauryl imidazolinium betaine 8 Lauryl amine oxide 2 Zeolite 7 Ethanol 6 Carboxymethyl cellulose 2 Sodium metaxylene sulfonate 5 Lipase 2 EDTA 0.2 Water Residue ────────────────────────── ────

The liquid detergents for clothes of Examples 20 to 23 are all excellent in detergency, low-temperature stability, solubility, and rinsability, and also suppress foaming and are excellent in biodegradability. It was a cleaning agent.

[0034]

The liquid detergent for clothes of the present invention has a detergency,
It has excellent solubility and ease of rinsing, and suppresses foaming.
A liquid detergent for clothes, which has excellent biodegradability and low-temperature stability.

Claims (1)

[Claims] 1. General formula (1): (In the formula, R is an alkyl group or an alkenyl group having 8 to 18 carbon atoms, and M is an alkali metal, an alkaline earth metal, or an organic amino group.) One kind of alkyl sulfate (A) Alternatively, it contains two or more kinds and one or more kinds selected from the nonionic surfactant (B) and / or the amphoteric surfactant (C), and R is an alkyl group having 8 or 10 carbon atoms. The liquid detergent for clothes, characterized by containing 15% by weight or more of all of the alkyl sulfates with respect to all the alkyl sulfates.