JPH11241097A - Liquid detergent composition - Google Patents

Abstract

(57) [Problem] To provide a liquid detergent composition having excellent detergency and low-temperature stability even when the concentration is high. SOLUTION: (a) 10 to 40% by weight of at least one kind of anionic surfactant selected from polyoxyethylene alkyl ether sulfate, alkylbenzene sulfonate and alkyl sulfate, and (b) mono-long-chain tertiary surfactant. (A) containing 5 to 20% by weight of a lower alkylamine oxide, (c) 1 to 10% by weight of a polyoxyethylene alkyl ether, and (d) 1 to 10% by weight of an alkyl polyglucoside.
+ (B) + (c) + (d) = 25 to 75% by weight,
Furthermore, the mixing ratio between the components is (b) / (a) = 0.8 to
1.1 (molar ratio), (c) / (d) = 0.5-2 (weight ratio) and [(c) + (d)] / (b) = 0.8-2 (weight ratio) Liquid detergent composition wherein the pH of the composition is between 6.0 and 6.8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid detergent composition having excellent detergency and low-temperature stability and suitable as a concentrated liquid detergent.

[0002]

2. Description of the Related Art Liquid detergents such as dishwashing detergents are required to have excellent properties such as detergency, foaming power, skin mildness and low-temperature stability. You. Anionic surfactants such as polyoxyethylene alkyl ether sulfates and alkylbenzene sulfonates are used as the main cleaning bases, and co-activators such as alkylamine oxides are used as the liquid cleaning agents to exhibit these various properties. Is also known. For example, JP-A-63-277300 discloses a liquid detergent composition containing a polyoxyethylene alkyl ether sulfate and an alkylamine oxide and having excellent detergency, foaming power and low-temperature stability. I have. However, such liquid detergent compositions have room for improvement in low-temperature stability when the concentration is increased. Particularly in recent years, high-concentration detergents have been used for the purpose of reducing packaging materials due to the increase in resource saving, so that low-temperature stability in concentrated liquid detergents has become an important property. .

[0003] The problem of low-temperature stability in such a combined system of an anionic surfactant and an alkylamine oxide is due to the formation of a molecular aggregate of the alkylamine oxide in the aqueous solution in the acidic region. When this molecular aggregate is formed, the electric repulsion between activator molecules forming micelles decreases and micelles are easily formed, so that the amount of solubilized oily substances increases and the detergency improves. Is obtained. However, on the other hand, in the acidic region, a strong thickening is observed due to the formation of a strong molecular aggregate, and an unfavorable negative blending effect of lowering the stability at low temperature due to an increase in the Kraft point is obtained. Can be

[0004] Such a positive / negative blending effect is caused by the fact that the blending molar ratio of alkylamine oxide and anionic surfactant (alkylamine oxide / anionic surfactant) approaches 1, and the amount of aggregates formed increases. Since it is remarkably developed, it is required to have excellent detergency and low-temperature stability when the molar ratio is about 1.

[0005] The present invention provides a concentrated detergent using an anionic surfactant and an alkylamine oxide as a co-activator, which liquid detergent is excellent in both detergency and low-temperature stability. With the goal.

[0006]

Means for Solving the Problems The inventors of the present invention set the molar ratio of both components to about 1 in a concentrated detergent using an anionic surfactant and an alkylamine oxide as a co-activator. Even in this case, it was found that by blending a specific nonionic surfactant and defining the blending ratio between each component and the pH of the composition, both properties of detergency and low-temperature stability can be synergistically improved. Completed the invention.

That is, the present invention relates to (a) 10 to 40% by weight of one or more anionic surfactants selected from polyoxyethylene alkyl ether sulfates, alkylbenzene sulfonates and alkyl sulfates; 5-20% by weight of long-chain tertiary alkylamine oxide,
(C) polyoxyethylene alkyl ether 1-10
(A) + (b) + (c) + (d) = 25% by weight and (d) 1 to 10% by weight of alkyl polyglucoside.
~ 70% by weight, and the mixing ratio between the components is
(B) / (a) = 0.8 to 1.1 (molar ratio), (c) /
(D) = 0.5 to 2 (weight ratio) and [(c) + (d)] /
(B) = 0.8 to 2 (weight ratio), and the pH of the composition is 6.0 to 6.8.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The component (a) used in the present invention includes at least one anionic surfactant selected from polyoxyethylene alkyl ether sulfate, alkylbenzene sulfonate and alkyl sulfate. Can be. Among these, since it has high mildness to the skin, the following general formula (I): R ¹ O (CH ₂ CH ₂ O) _n SO ₃ M (I) [wherein, R ¹ is a straight-chain having 9 to 16 carbon atoms. Represents an alkyl group or an alkenyl group of a chain or a branched chain, n is an average number of added moles of the oxyethylene group, and represents an average of 1 to 6, and M is an alkali metal, alkaline earth metal, ammonium group or alkanol substitution. Indicates an ammonium group. ] Is preferable.

In the general formula (I), the carbon number of R ¹ is
9-16 to enhance detergency and low-temperature stability,
Preferably it is 10-14. In the general formula (I), n is a number of 1 to 6 on average for the same reason, and preferably a number of 2 to 4.

The content of the component (a) in the composition is as follows:
10-40% by weight to increase detergency and low temperature stability
And preferably 12 to 30% by weight.

[0011] The component (b) used in the present invention is a mono-long chain third component.
As the lower alkylamine oxide, the following general formula (I
I):

[0012]

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[Wherein, R ² represents a linear or branched alkyl or alkenyl group having 10 to 16 carbon atoms;
R ³ and R ⁴ represent a methyl group or an ethyl group. ] Is preferable.

In the general formula (II), the carbon number of R ² is
In order to enhance the detergency and low-temperature stability, it is 10 to 16, preferably 10 to 12.

The content of the component (b) in the composition is as follows:
In order to enhance the detergency and low-temperature stability, the content is 5 to 20% by weight, preferably 5 to 15% by weight.

The polyoxyethylene alkyl ether of the component (c) used in the present invention is represented by the following general formula (II)
I): R ⁵ O (CH ₂ CH ₂ O) _q H (III) wherein R ⁵ represents a linear or branched alkyl or alkenyl group having 10 to 16 carbon atoms, and q represents an oxyethylene group Shows the average number of moles added. ] Is preferable.

In the general formula (III), when R ⁵ is derived from a linear or branched primary alcohol, q is 5
When R ⁵ is derived from a linear secondary alcohol, q is preferably 6 to 12.

The content of the component (c) in the composition is as follows:
In order to enhance detergency and low-temperature stability, the content is 1 to 10% by weight, preferably 3 to 8% by weight.

The alkyl polyglucoside of the component (d) used in the present invention is represented by the following general formula (IV): R ⁶ (OR ⁷ ) _x G _y (IV) wherein R ⁶ has 8 to 18 carbon atoms. Represents a linear or branched alkyl or alkenyl group, and R ⁷ has 2 to 4 carbon atoms.
G represents a residue derived from a reducing sugar having 5 to 6 carbon atoms, x represents a number having an average value of 0 to 5, and y represents an average value of 1.0 to 3. Indicates a number. ] Is preferable. In the general formula (IV), y is preferably a number having an average value of 1.0 to 1.42.

The content of the component (d) in the composition is as follows:
In order to enhance detergency and low-temperature stability, the content is 1 to 10% by weight, preferably 3 to 8% by weight.

In the liquid detergent composition of the present invention, the total content of the above components (a), (b), (c) and (d) is from 25 to 25 in order to enhance detergency and low-temperature stability. 7
0% by weight, preferably 25 to 40% by weight.

In the liquid detergent composition of the present invention, the mixing ratio of each of the components (a) and (b) is (b) / (a) = 0.8 to 1.1, preferably in a molar ratio. 0.9 ~
1.0; the mixing ratio of the components (c) and (d) is (c) / (d) = 0.5 to 2, preferably 0.7 to
1.3; the blending ratio of the components (b), (c) and (d) is [(c) + (d)] / (b) = 0.8 to 2 by weight ratio;
Preferably it is 0.9-1.5. By defining the molar ratio of each component in the above range, the detergency and low-temperature stability of the liquid detergent composition can be increased.

The liquid detergent composition of the present invention may further contain an alkylhydroxysulfobetaine as the component (e). This alkylhydroxysulfobetaine is represented by the following general formula (V):

[0024]

Embedded image

[Wherein, R ⁸ represents a linear or branched alkyl or alkenyl group having 10 to 16 carbon atoms;
R ⁹ and R ¹⁰ may be the same or different and each represents a methyl group or an ethyl group. ] Is preferable.

The content of the component (e) in the composition is as follows:
It is preferably 1 to 5% by weight, particularly preferably 2 to 4% by weight.
% By weight.

The liquid detergent composition of the present invention may further contain other components as long as the object of the present invention is not impaired. Other components include fatty acid alkanolamides derived from coconut oil or palm kernel oil, alkyl betaines,
Surfactants such as soap; lower alcohols such as ethanol and isopropanol; glycols such as propylene glycol and polypropylene glycol having a molecular weight of up to 2000; aromatic sulfonic acids such as p-toluenesulfonic acid salt and m-xylenesulfonic acid salt Salt; fragrance, coloring matter, antiseptic or fungicide, thickener and the like.

The liquid detergent composition of the present invention has a pH of 6.0 to 6.8, preferably 6.2 to 6.6, in order to enhance the detergency and low-temperature stability.

[0029]

EXAMPLES Examples 1 to 6 and Comparative Examples 1 to 4 Using the components shown in Table 1, liquid cleaning compositions of Examples and Comparative Examples were obtained. These compositions were tested for soil cleaning power and low temperature stability by the following methods. Table 1 shows the results. In addition, the numerical value of each component in Table 1 is shown by weight%.

(1) Dirty cleaning power A 10% by weight of a 15% by weight aqueous solution of sodium dodecylbenzenesulfonate (soft type) (detergent A) was prepared by 10 subjects.
The liquid detergent compositions (detergent B) of Examples and Comparative Examples were
Each sponge (containing 20g of water in advance)
g was impregnated, and the model oil stain dish was washed. As a model soiling dish to be washed, a tallow / salad oil (weight ratio: 9/1) mixture is completely dissolved at 60 ° C. to form a uniform solution, which is uniformly placed in the center of a white porcelain dish (20 cm in diameter). After coating 2 g, five air-dried one day and night were used. Dirt detergency was evaluated according to the following criteria, and the average score of 10 persons was 4.5 or more ◎, 3.5 or more and less than 4.5, ○, 2.5 or more and less than 3.5, Less than 2.5 was indicated as x. 5: Detergent B is good 4: Detergent B is slightly good 3: Both have no difference 2: Detergent A is slightly good 1: Detergent A is good.

(2) Low-temperature stability 80 ml of each of the compositions of the examples and comparative examples were placed in a glass bottle having a capacity of 100 ml, sealed, and then stored in a constant temperature room at -5 ° C for 7 days. After the test, the appearance of each composition was evaluated according to the following criteria. ：: transparent and flowable △: transparent but poor flowability ×: cloudy or precipitated

[0032]

[Table 1]

The compositions of the examples include (a), (b),
The total content of the components (c) and (d) is as high as 32.5 to 50% by weight (36.5 to 55% by weight including the component (e)), and (b) / (a) = 0. Despite being in the range of 9 to 1.1 (molar ratio), all had excellent detergency and low-temperature stability. The composition of the comparative example,
The total content of the components (a), (b), (c) and (d) is 25 to 32.5% by weight (including the component (e), it is 27 to 3%).
(6.5% by weight), one or both of the detergency and low-temperature stability were inferior. This result is because the compounding ratio and pH among the components (a), (b), (c) and (d) are outside the ranges specified in the present invention. Therefore, in the liquid detergent composition of the present invention, it was confirmed that the cleansing power and the low-temperature stability were significantly improved by the synergistic action by defining the mixing ratio and the pH.

[0034]

The liquid detergent composition of the present invention has excellent detergency and low-temperature stability even at a high concentration. Therefore, not only can the convenience of consumers be improved,
Product management at the distribution stage such as transportation and retail stage at a store is also easier.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI C11D 1:12 1:29 1:75 1:92 3:20)

Claims (2)

[Claims] (1) 10 to 40% by weight of one or more anionic surfactants selected from the group consisting of polyoxyethylene alkyl ether sulfates, alkylbenzene sulfonates and alkyl sulfates; Tertiary alkylamine oxide 5-2
0% by weight, (c) polyoxyethylene alkyl ether 1 to 10
(A) + (b) + (c) + (d) = 25-70% by weight, and the mixing ratio between the components is , (B) / (a)
= 0.8-1.1 (molar ratio), (c) / (d) = 0.5-
2 (weight ratio) and [(c) + (d)] / (b) = 0.8-
2 (weight ratio), and the pH of the composition is 6.0 to 6.8. 2. The liquid detergent composition according to claim 1, further comprising (e) alkylhydroxysulfobetaine in an amount of 1 to 5% by weight.