JP2000192081A - Acidic liquid detergent composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a laundry detergent composition having a deodorizing effect by selecting a composition containing a plurality of nonionic surfactants and an amphoteric surfactant in a specified ratio and having a specified acidity. SOLUTION: This composition comprises 5-20 wt.% in total, nonionic surfactant (A) represented by the formula; R1-O-(R2)n1(R3)m1-H and nonionic surfactant (B) represented by the formula: R1-O-(R2)n2(R3)m2-H and 3-15 wt.% amphoteric surfactant (C) of the type of an alkyldimethylaminoacetic acid betaine with an 8-18C alkyl in such amounts that the ratio A/B is 8/2 to 2/8 by weight, and the ratio (A+B)/C is 7/3 to 3/7 by weight and has a pH of 4-6 when measured on a 1% aqueous solution of the composition. In the formulae, R1 is a 10-20C primary or secondary alkyl; R2 is an ethylene oxide group; R3 is a propylene oxide group; n1 is 5-8; m1 is 0-3; n2 is 9-16; and m2 is equal to m1. If necessary, the composition may additionally contain a hydrotropic agent, a foam controlling agent, a chelate builder, an anti-redeposition agent, etc.

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 for laundry, and more particularly to an acidic liquid detergent composition having a deodorizing effect, which is useful in nursing homes and the like.

[0002]

2. Description of the Related Art Conventionally, nonionic, anionic, amphoteric, and amphoteric surfactants have been mainly used as washing components in a liquid detergent composition for laundry. Alkyl sulfates or polyoxyethylene alkyl ether salts are mainly used as anionic surfactants,
As nonionic surfactants, polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, and the like are used. Examples of the amphoteric surfactant include alkyl imidazolinium betaine, alkyl dimethyl acetate betaine, and alkyl amide betaine, and examples of the amphoteric surfactant include an alkyl or alkenyl tertiary amine oxide. Recently, attempts have been made to improve the detergency by combining these surfactants (JP-A-57-195800 and JP-A-63-66330).

[0003]

However, at present, the above liquid detergent has a low detergency when washed on the acidic side.

[0004] It is an object of the present invention to provide an acidic liquid detergent composition for laundry, which has excellent detergency even when it is washed on the acidic side, and has a deodorizing effect.

[0005]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to overcome the drawbacks, and as a result, by combining a specific type of nonionic surfactant and an amphoteric surfactant in a specific ratio, The present inventors have found that a laundry detergent composition having a good detergency and a deodorizing effect can be obtained, thereby completing the present invention.

That is, the acidic liquid detergent composition of the present invention comprises:
(A) The following general formula (1)

Embedded image R ₁ —O— (R ₂ ) _n1 (R ₃ ) _m1 —H (1) wherein R ₁ is a primary or secondary alkyl group having 10 to 20 carbon atoms, and R ₂ is ethylene. An oxide group, R ₃ is a propylene oxide group, and represents n1 = 5 to 8, m1 = 0 to 3), and (b) the following general formula (2)

Embedded image R ₁ —O— (R ₂ ) _n2 (R ₃ ) _m2 —H (2) wherein R ₁ is a primary or secondary alkyl group having 10 to 20 carbon atoms, and R ₂ is ethylene. An oxide group, R ₃ is a propylene oxide group, n2 = 9 to 16, m2 = 0 to 3;
5 to 20% by weight of a nonionic surfactant represented by the following formula: (c) an alkyldimethylaminoacetic acid betaine-type amphoteric surfactant having an alkyl group having 8 to 18 carbon atoms;
15% by weight, and the ratio of (a) / (b) is 8 by weight.
/ 2 to 2/8, ((a) + (b)) /
(C) The ratio of the components is in the range of 7/3 to 3/7 by weight, and the pH of the 1% aqueous solution of the detergent composition is in the range of 4 to 6.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. The nonionic surfactant used as the component (a) in the present invention is represented by the general formula (1).

[0008]

Embedded image R ₁ —O— (R ₂ ) _n1 (R ₃ ) _m1 —H (1) (wherein R ₁ has 10 to 20 carbon atoms, preferably 12 to 14 carbon atoms)
A primary or secondary alkyl group, R ₂ is an ethylene oxide group, R ₃ is a propylene oxide group, and n1 =
5-8, m1 = 1-3) Specifically, C10
A block polymer obtained by adding 5 to 8, preferably 6 to 7 moles of ethylene oxide and then adding 1 to 3 moles of propylene oxide per 1 mole of an alcohol having an alkyl group having a C12 to 16 alkyl group is added. Preferred examples are given.

The nonionic surfactant used as the component (b) in the present invention is represented by the general formula (2).

[0010]

Embedded image R ₁ —O— (R ₂ ) _n2 (R ₃ ) _m2 —H (2) (wherein R ₁ has 10 to 20 carbon atoms, preferably 12 to 14 carbon atoms)
A primary or secondary alkyl group, R ₂ is an ethylene oxide group, R ₃ is a propylene oxide group, and n2 =
9 to 16, m2 = 0 to 3) Specifically, C1
0 to 20, preferably 9 to 16, preferably 12 to 1, per mole of alcohol having a C12 to 16 alkyl group.
A block polymer obtained by adding 5 mol of ethylene oxide and then adding 1 to 3 mol of propylene oxide.
Alternatively, an alcohol ethoxylate obtained by adding 9 to 16, preferably 10 to 15 moles of ethylene oxide per mole of an alcohol having 10 to 20, preferably 12 to 16 alkyl groups can be mentioned as a suitable example.

The content of the nonionic surfactant used in the present invention is in the range of 5 to 20% by weight, preferably 10 to 15% by weight, based on the total amount of the components (a) and (b). . If the total content of the nonionic surfactant is less than 5% by weight, a satisfactory detergency cannot be obtained, and if it is more than 20% by weight, the viscosity of the product is lost, which is not preferable.

In the present invention, the weight ratio of the component (a) to the component (b), which is a nonionic surfactant, is (a)
/ (B) = 8/2 to 2/8.
When the ratio of (a) / (b) is higher than 8/2, the amount of the component (a) is large, and the stability of the product at high temperatures (generally, 50 ° C. or higher) is poor, and a uniform appearance is obtained. When the amount of the component (b) is larger than 2/8, the cleaning performance is disadvantageously deteriorated.

The betaine aminoacetate used as the component (c) in the present invention is represented by the general formula (3). In the formula, R represents an alkyl group having 8 to 22 carbon atoms.

[0014]

Embedded image Specific preferred examples include betaine lauryldimethylaminoacetate, betaine coconut dimethylaminoacetate, betaine myristyldimethylaminoacetate, betaine palmityldimethylaminoacetate, and the like. The content of the component (c) in the present invention is in the range of 3 to 15% by weight, preferably 6 to 12% by weight in the product. (C) in the present invention
If the content of the component is less than 3% by weight in the product, the desired performance cannot be obtained. If the content exceeds 15% by weight, foaming during use is too high, which is not preferable.

In the present invention, the ratio of the sum of the components (a) and (b) which are nonionic surfactants and the component (c) which is betaine aminoacetate is ((a) + (b)) / (c). Must be in the range of 7/3 to 3/7. If the ratio of ((a) + (b)) / (c) is higher than (7) / 3 ((a) + (b)), a sufficient deodorizing effect cannot be obtained, and 3 / If the ratio of the component (c) is higher than 7, the foam becomes too high during washing, which is not preferable.

The cleaning composition of the present invention further requires that the pH of a 1% aqueous solution of the cleaning composition be in the range of 4 to 6. If the pH of the 1% aqueous solution of the detergent composition is less than 4, corrosion of the washing machine is caused, and if it exceeds 6, a sufficient deodorizing effect is not exhibited, which is not preferable.

The acidic liquid detergent composition of the present invention may further comprise, if necessary, a hydrotrope such as ethanol, propanol, and meta-xylene sulfonsan salt, and a C8 to C1 hydrocarbon.
Alkanolamine salts of higher fatty acids having an alkyl or alkenyl group of 8, foam control agents such as potassium salts, pyrophosphoric acid, ethylenediaminetetraacetic acid, nitrilotriacetic acid, alkanolamine salts such as citric acid and other polycarboxylic acids, Chelate builders that are potassium salts, polyethylene glycol, polyvinyl alcohol, anti-recontamination agents such as polyvinylpyrrolidone, proteases, enzymes such as amylase and lipase, optical brighteners, dyes, fragrances,
An antimicrobial agent or the like can be added.

[0018]

Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. Prior to the examples, evaluation methods are described below to clarify the effects.

[Evaluation Method of Detergency and Prevention of Recontamination] (1) Soil Cloth for Evaluating Detergency As a stain cloth, a wet artificial stain cloth manufactured by Washing Science Association shown below was used, and this was reduced to 5 cm × 5 cm. Cut, 1 on the base cloth
A set of the pieces sewn together by 0 sheets was subjected to the test.

(2) Washing condition The washing device is a 10 kg type washer manufactured by Asahi Seisakusho (EC
ONOMATO 10) was used. The to-be-washed thing was about 8 kg of underwear worn in a nursing home, which had almost the same degree of dirt and odor, and was used for washing. As the detergent, 100 g of the liquid detergent composition described below was introduced from the inlet when washing. The water used for washing and rinsing is 4 ゜ DH hard water.

After washing at 40 ° C. for 15 minutes,
Draining and rinsing are repeated twice at 30 ° C. for 3 minutes. Thereafter, dehydration was performed, and drying was performed with a dryer.

[Measurement of Detergency] The Z value of the cleaning cloth tested by the above evaluation method was measured using a colorimetric colorimeter (Type 80) manufactured by Nippon Denshoku Industries Co., Ltd. Was calculated. The display is the average value of the detergency obtained for 10 test contaminated cloths.

[0023]

(Equation 1) [Judging method of deodorizing effect] The underwear tested by the above-mentioned evaluation method was judged by 10 panelists, and the following score was given from the average. A: Almost no unpleasant odor. B: Slight odor, but no practical problem. C: Strong odor remains.

[Examples 1 to 4 and Comparative Examples 1 to 3] The acidic liquid detergent compositions shown in Table 1 were prepared and subjected to evaluation tests.

[0025]

[Table 1]

As is clear from Table 1, although the pH was adjusted to 4 in both Examples and Comparative Examples, (a) /
In Comparative Examples 1 to 3, in which both the weight ratio (b) and the weight ratio ((a) + (b)) / (c) did not satisfy the requirements of the present invention, both the deodorizing effect and the detergency were inferior.

Example 5 and Comparative Example 4 An acidic liquid detergent composition shown in Table 2 was prepared and subjected to an evaluation test.

[0028]

[Table 2]

In addition, 1% of the liquid detergent composition shown in Table 2
The pH of the aqueous solution was 4. Diethanolamine was added to the liquid detergent composition prepared in Table 2 as Comparative Example 4,
The pH was adjusted to 10 and subjected to the test similarly. Table 3 shows the results.

[0030]

[Table 3]

As is clear from Table 3, despite having the same composition, diethanolamine was added and the pH was changed.
In Comparative Example 4 in which was adjusted to 10, the deodorizing effect was remarkably inferior.

[0032]

According to the present invention, a specific nonionic surfactant mixture and a specific higher alkyldimethylaminoacetate betaine are combined in a specific ratio, and the pH of a 1% aqueous solution of the detergent composition is adjusted to 4 to 4. By limiting the number to 6, an acidic liquid detergent composition having a deodorizing effect useful in nursing homes and the like can be obtained.

Claims (1)

[Claims] (A) R ₁ —O— (R ₂ ) _n1 (R ₃ ) _m1 —H (1) wherein R ₁ has 10 to 20 carbon atoms. A primary or secondary alkyl group, R ₂ represents an ethylene oxide group, R ₃ represents a propylene oxide group, and represents n1 = 5 to 8, m1 = 0 to 3), and (b) the following general formula: (2) embedded image R ₁ —O— (R ₂ ) _n2 (R ₃ ) _m2 —H (2) wherein R ₁ is a primary or secondary alkyl group having 10 to 20 carbon atoms; ₂ is an ethylene oxide group, R ₃ is a propylene oxide group, n2 = 9 to 16, m2 = 0 to 3
5 to 20% by weight of a nonionic surfactant represented by the following formula: (c) 3 to 15% by weight of an alkyldimethylaminoacetic acid betaine type amphoteric surfactant having an alkyl group having 8 to 18 carbon atoms. , (A) / (b) in a weight ratio of 8/2 to 2
2/8, the ratio of the components ((a) + (b)) / (c) is in the range of 7/3 to 3/7 by weight, and a 1% aqueous solution of the detergent composition. PH is in the range of 4 to 6.