JPH0759717B2 - Liquid detergent composition - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a stabilized liquid detergent composition which retains a uniform phase even after thawing and reconstitution after freezing.

2. Description of the Related Art Conventionally, it is known to use a higher fatty acid alkanolamide in combination with another ionic surfactant to enhance the detergent effect. For example, JP-A-49-81411 discloses a combined system of alkanolamide and polyoxyethylene alkyl sulfate ester salt (AES); JP-A-50-60505 discloses alkaramide, α-olefin sulfonic acid. Salt and
AES combined use system; JP-A-53-41310 discloses a combined use system of alkanolamide and α-sulfofatty acid ester salt. Furthermore, in JP-A-53-96007,
Compositions based on diethanolamide of higher fatty acids are disclosed.

These compositions have mild properties, good biodegradability, and excellent cleaning performance, and have lower alcohols such as ethanol; polyols such as glycerin and polyethylene glycol; urea; lower alcohols such as toluene sulfonate. By using a general solubilizer such as an alkylbenzene sulfonate, it is possible to maintain the uniformity during low temperature storage.

However, in order to improve the cleaning performance, if alkanolamide is blended in an amount exceeding 2/5 of the combined surfactant, if it solidifies once at low temperature, it will become cloudy even if it is thawed at elevated temperature, or up to about 20 ° C. If the temperature is not raised, it remains solidified, which has a drawback that the commercial value is significantly impaired.

OBJECT OF THE INVENTION The present invention aims to provide a stabilized liquid detergent composition having good thawing and restoring properties.

Structure of the Invention The present invention provides the following (a), (b), (c) and (d)
The weight ratio of the components is (a) component / (b) component = 3 to 0.4, and the total amount of (a) component + (b) component is 15 to 45.
It is characterized in that it is contained in a range of 30% by weight, and further, the component (c) is contained in an amount of 30 to 100% by weight based on the component (a).

(A) A higher fatty acid diethanolamide in which at least 65% of the acyl groups have 12 carbon atoms.

(B) Anionic, amphoteric or semipolar surfactant.

(C) an aromatic monocarboxylic acid salt represented by the following general formula (I), (The symbols in the formula indicate the following.

R: —H, —OH or an alkyl group having 1 to 3 carbon atoms, M: an alkaline ion that imparts electrical neutrality) (d) A solvent composed of water or an aqueous ethanol solution.

Hereinafter, the present invention will be described in more detail.

At least 65% of the higher fatty acid diethanolamide as the component (a) needs to be C ₁₂ . If the number of carbon atoms is 10 or less, the cleaning performance is lowered. On the other hand, if the number of carbon atoms is 14 or more, the stability at low temperature is deteriorated, which is not preferable.

The higher fatty acid diethanolamide can be produced, for example, by distilling coconut fatty acid methyl ester or palm kernel fatty acid methyl ester to adjust the carbon distribution to the above range and then reacting it with diethanolamine, and particularly preferred lauroyl diethanolamide. Can be mentioned.

As the component (b), at least one ionic surfactant selected from anionic surfactants, amphoteric surfactants and semipolar surfactants is used.

Among these, the following can be illustrated as anionic surfactants.

1) a linear alkylbenzene sulfonate in which the average carbon chain length of the linear alkyl group is 10 to 16; 2) after adding 1 to 7 moles of ethylene oxide on average to 1 mole of a higher alcohol having an average carbon chain length of 11 to 14 Sulfated salt of polyoxyethylene alkyl sulfate, 3) Alpha olefin sulfonate having an average carbon chain length of 11 to 15, 4) Sulfonating a C _1-3 alcohol ester of fatty acid having an average carbon chain length of 11 to 18 Obtained salt of alpha sulfo fatty acid ester, 5) Sulfo fatty acid salt having average carbon chain length of 11-18, 6) Fatty acid having average carbon chain length of 11-18, sarcosine, N-
Salts of N-long chain acylated amino acids synthesized from amino acids such as methyl-β-alanine and glutamic acid, 7) N-long chain alkyloylalkyl synthesized from fatty acids having an average carbon chain length of 11 to 18 and taurine Salt of taurine, 8) N-long chain acylated peptide salt synthesized from fatty acid having an average carbon chain length of 11 to 18 and peptide.

Examples of salts of these anionic surfactants include alkali metal salts, alkaline earth metal salts, and substituted or unsubstituted ammonium salts.

As a typical example of the amphoteric surfactant, the following general formula (I
Examples thereof include alkylamidobetaine, alkylaminobetaine, and alkylbetaine represented by I), (III), or (IV). Examples thereof include cocoamidopropylbetaine, myristylaminobetaine, and cocobetaine. Further, sulfobetaine in which the carboxylate group of betaine is substituted with a sulfonate group can also be used.

(Each symbol in the formula indicates the following.

R ₁ : C _9-17 alkyl or alkenyl chain, R ₂ : C _10-18 alkyl or alkenyl chain, n: 2-5 integer) The semipolar surfactant is represented by the following general formula (V). The amine oxide is exemplified.

(R _{4 is} an alkyl group having an average carbon number of 11 to 14) (a) higher fatty acid diethanolamide as a component, and (b)
Anionic, amphoteric or semipolar surfactant of the component,
It is important to exist in a specific amount / ratio, and (a) component /
The weight ratio of component (b) is 3 to 0.4, preferably 2 to 0.4, and the total amount of component (a) and component (b) is 15 per composition.
It should be ~ 45% by weight, preferably 15-30% by weight.

When the component ratio of (a) / (b) exceeds 3, the freeze-restoring property is not improved even if the amount of the aromatic monocarboxylic acid salt of the component (c) is increased. On the other hand, when it is less than 0.4, the fatty acid diethanolamide of the component (a) is dissolved in the ionic surfactant which is the component (b), so that a usual solubilizer other than the component (c) (for example, ethanol, urea, Triene sulfonate)
Although the use of such a compound does not cause a problem in stability, it has a drawback that cleaning performance is deteriorated.

Further, if the total amount of both components (a) and (b) is less than 15% by weight, the amount of the solvent is relatively increased, and the solubilizing agent is stable, but the cleaning performance is deteriorated. On the other hand, when it exceeds 45% by weight, the freeze-restoring property is not improved even if the component (c) is increased.

The aromatic monocarboxylic acid salt as the component (c) is used as a freeze rejuvenating agent and is represented by the following general formula (I).

(The symbols in the formula indicate the following.

R: —H, —OH or an alkyl group having 1 to 3 carbon atoms, M: an alkaline ion that imparts electrical neutrality) (c) Specific examples of the component include benzoate (R = H),
Salicylate (R = OH), toluate (R = CH ₃ ),
The humic acid salt [(CH ₃ ) ₂ CH] can be mentioned. As salt,
Examples include sodium, potassium, magnesium, ammonium and the like.

The component (c) is blended in an amount of 30 to 100% by weight, preferably 35 to 80% by weight, based on the component (a). If this amount is less than 30% by weight, the freeze-restoring property is not improved.
Even if it is blended over the range, the effect is constant and there is no advantage.

Although the mechanism of the effect expression of the component (c) is not known in detail, the freeze-restoring effect in comparison with the conventional solubilizers is in the following order (the higher the order, the lower the temperature that can be restored). Aromatic monocarboxylate >> Lower alkylbenzene sulfonate> Lower alcohol> Urea Urea, which destroys hydrogen bonds (iceferge bonds) of solvents, is the least effective, and in some micelle (liquid crystal) structures like ethanol. Considering that even if it enters, the substance having a compact molecular structure has a small effect, and therefore the aromatic monocarboxylic acid salt of the present invention enters the structure of the alkanolamide during freezing, and since the molecule is bulky, the alkanolamide To loosen the crystal structure,
It is considered to be easy to restore.

The component (d) consists of water, ethanol, or an aqueous solution,
It is a solvent that balances the composition.

The liquid detergent composition of the present invention may further contain conventional components as long as the stability is not deteriorated.

Examples of common components include chelating agents such as citric acid, ethylenediaminetetraacetic acid and salts thereof; dyes; perfumes; emulsifiers; solubilizers such as urea and lower alkylbenzene sulfonates.

EFFECTS OF THE INVENTION According to the present invention, a higher fatty acid diethanolamide can be obtained by adding a specific aromatic monocarboxylic acid salt to a system in which a higher fatty acid diethanolamide and an ionic surfactant are mixed in a specific amount / ratio. It is possible to improve the freeze-restoring property of the contained liquid detergent composition, and even after once frozen at a low temperature, it can be restored to its original uniform state if the temperature rises.

Hereinafter, the present invention will be described in detail with reference to examples. In addition, the freeze-restoration property in the examples was evaluated according to the following method.

Freeze-Restorability The composition was filled in a 100-ml glass bottle, stored in a constant temperature bath at -20 ° C for 1 day and frozen, and then stored in a constant temperature bath at + 5 ° C for 3 days, followed by thawing / restoring cycles three times, and then, The appearance at + 5 ° C was judged according to the following criteria.

○: Uniformly transparent ●: White turbidity or white turbidity solidification Example Each composition shown in Table 1 below was prepared, and the freeze-restoring property was evaluated. Each symbol in the table indicates the following.

LDE; Lauroyldiethanolamide CDE (1); Cocoyldiethanolamide (C ₁₀ or less: 10% C ₁₂ : 70% C ₁₄ or more: 20%) CDE (2); Cocoyldiethanolamide (C ₁₀ or less: 5% C ₁₂ : 45% C ₁₄ : or more: 50%) LAS-Na; sodium dodecylbenzenesulfonate AES-Na; sodium polyoxyethylene alkyl sulfate (alkyl group: C ₁₃ , straight chain 60%, average number of moles of ethylene oxide added: 3) α-SFM-Na; α-sulfolauric acid methyl ester sodium acylated alaninate; N-cocoyl-N-methyl-β-alanine sodium acylated sarcosinate; N-lauroyl-sarcosine sodium amide betaine (1); lauroylamide Propylbetaine amidobetaine (2); Myristoylamidopropylbetaine amine oxide; Dodecyl Dimethylamine oxide

Claims (1)

[Claims] 1. At least 65% of (a) an acyl group has a carbon number.
12 higher fatty acid diethanolamide and (b) anionic, amphoteric or semipolar surfactant in a weight ratio of (a) component / (b) component = 3 to 0.4, and (a) The total amount of component and (b) component is 15 ~
Aromatic monocarboxylic acid salt containing 45% by weight and further represented by (c) the following general formula (I) (The symbols in the formulas are as follows: R: —H, —OH or an alkyl group having 1 to 3 carbon atoms, M: an alkaline ion that imparts electrical neutrality) A solvent consisting of 100% by weight and (d) water or an aqueous ethanol solution. A liquid detergent composition comprising: