JP2010047653A - Liquid detergent composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid detergent composition being excellent in flowability at a low temperature and having high detergency. <P>SOLUTION: The liquid detergent composition contains a specific PO-EO block addition type non-ionic surfactant represented by following general formula (1) in which an alkyl group is constituted by 5-95 mol% of a 11C or less saturated straight chain hydrocarbon group and 5-95 mol% of a 12C or more saturated straight chain hydrocarbon group. R-O-(PO)<SB>m</SB>-(EO)<SB>n</SB>-H (1) (wherein R represents a 6C-24C saturated straight chain hydrocarbon group, PO represents a propyleneoxy group, m is 0.1≤m≤15 in an average addition molar number, EO represents an ethyleneoxy group, and n is 0<n≤50 in an average addition molar number). <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a liquid detergent composition.

  As a liquid detergent composition, a higher alcohol ethoxylate in which ethylene oxide is added to a higher alcohol having a linear alkyl group is known, but at a low temperature, a liquid crystal structure is easily formed, resulting in poor fluidity and separation. Wake up.

  In order to overcome the above problems, higher alcohol ethoxylates having branched alkyl groups have been proposed, but they were inferior to linear alcohol ethoxylates in terms of detergency.

  Moreover, although the unsaturated alcohol ethoxylate which has an unsaturated bond in a hydrocarbon group is excellent in low-temperature fluidity | liquidity, since it has a double bond, its detergency and stability are inferior. Further, in Patent Document 1, attempts have been made to improve low-temperature fluidity by blending a solvent, but this is not preferable because it not only affects the performance of the surfactant itself but also contains a solvent that does not participate in cleaning.

Further, in Patent Document 2, a nonionic surfactant obtained by random addition of ethylene oxide and propylene oxide to a saturated linear higher alcohol was proposed, but this still has satisfactory fluidity and detergency. Not done.
JP 51-13394, JP-A-7-303825

  The subject of this invention is providing the liquid detergent composition which is excellent in the fluidity | liquidity in low temperature, and has high detergency.

The present invention is represented by the following general formula (1), and R is a saturated linear hydrocarbon group having 11 or less carbon atoms (hereinafter referred to as a short-chain alkyl group) of 5 to 95 mol% and having 12 or more carbon atoms. The present invention relates to a liquid detergent composition containing a nonionic surfactant (hereinafter referred to as component (a)) composed of 5 to 95 mol% of a saturated linear hydrocarbon group (hereinafter referred to as a long chain alkyl group). .
R—O— (PO) _m — (EO) _n —H (1)
(In the formula, R is a saturated linear hydrocarbon group having 6 to 24 carbon atoms, PO is a propyleneoxy group, m is an average addition mole number, 0.1 ≦ m ≦ 15, EO is an ethyleneoxy group, and n is an average addition. (0 <n ≦ 50 in terms of moles)

  The liquid detergent composition of the present invention is excellent in fluidity at low temperatures and has a high detergency.

<(A) component>
R in the general formula (1) of the component (a) preferably has 8 to 22 carbon atoms, more preferably 8 to 18 carbon atoms, and still more preferably 8 to 8 carbon atoms, because of the versatility and handling properties of the raw materials. 16. Examples of R include a linear alkyl group.

  The component (a) is composed of 10 to 90 mol% of short-chain alkyl groups and 10 to 90 mol% of long-chain alkyl groups, and further short-chain alkyl groups 20 in terms of performance such as low-temperature fluidity and detergency. It is preferably composed of ˜80 mol% and long chain alkyl group 20˜80 mol%, and further composed of short chain alkyl group 30˜70 mol% and long chain alkyl group 30˜70 mol%.

  Moreover, after satisfy | filling the said structural ratio, R of (a) component WHEREIN: The molar ratio of a short chain alkyl group and a long chain alkyl group is short chain alkyl group / long chain alkyl group = 1 / 9-9 / 1, Further, it is preferably 1/4 to 4/1, and more preferably 3/7 to 7/3.

In addition, the molar ratio of the saturated straight chain hydrocarbon group (R ₁₂ ) having ₁₂ carbon atoms and the saturated straight chain hydrocarbon group (R _A ) having 13 or more carbon atoms in the long chain alkyl group of component (a) is R _12. / R _A = 5/95 to 95/5 is preferable from the viewpoint of detergency, and R ₁₂ / R _A = 10/90 to 90/10, further 20/80 to 80/20, and further 30/70. ~ 70/30, more preferably 40 / 60-60 / 40.

  Moreover, as for (a) component, it is preferable that each ratio of the compound of the specific carbon number in R is 40 mol% or less, More preferably, it is 35 mol% or less. Therefore, the component (a) preferably contains three or more compounds having different carbon numbers as R.

  In general formula (1), the average added mole number of m PO is preferably 0.2 to 10, more preferably 0.5 to 5, from the viewpoint of performance such as detergency.

  In addition, in the general formula (1), the average added mole number of EO of n is preferably from 3 to 30, more preferably from 4 to 20, and still more preferably from 5 to 15 from the viewpoint of fluidity at low temperatures. .

  Further, m / n (ratio of average added mole number) is preferably 1/150 to 10/3, more preferably 1/40 to 5/4, and even more preferably 1/30 to 1/1.

  The component (a) can be obtained, for example, by adding propylene oxide to an aliphatic saturated linear alcohol and further adding ethylene oxide, and block addition in this order, and hydrocarbon group R However, it is essential that it is a mixture of a short-chain alkyl group having 11 or less carbon atoms and a long-chain alkyl group having 12 or more carbon atoms. Thereby, in the liquid cleaning composition of this invention, the favorable fluidity | liquidity in low temperature and high detergency can be implement | achieved.

  As the component (a), the distribution of the alkylene oxide adduct is broadened, and a more preferable compound is obtained for obtaining the effects of the present invention. Therefore, it is preferable to use an alkali catalyst in the alkylene oxide addition reaction. That is, the component (a) is preferably obtained by a production method including a step of adding an alkylene oxide to a raw material compound (aliphatic saturated linear alcohol and its propylene oxide adduct) in the presence of an alkali catalyst. Examples of the alkali catalyst include alkali metal hydroxides such as potassium hydroxide and sodium hydroxide, and amine compounds such as triethylamine. A more preferable amount of catalyst is within a range of 0.005 to 1.5% by weight (in terms of solid content), more preferably 0.02 to 1.2% by weight (in terms of solid content) per reaction crude product (total amount charged). is there.

  (A) Although the manufacturing conditions of a component are shown below, it is not limited to this.

  Heating, cooling operation, depressurization, pressurization operation are possible, and the above-listed reactors are equipped with a raw material inlet, a product outlet, an alkylene oxide and nitrogen inlet tube, a stirrer, a thermometer, and a pressure gauge. A predetermined amount of an aliphatic alcohol that can be suitably used in the invention is charged, and then solid potassium hydroxide or sodium hydroxide, or an aqueous solution thereof is charged, and then purged with nitrogen, and the pressure is reduced in a temperature range from room temperature to 110 ° C. Dehydrate. Next, a predetermined amount of alkylene oxide (propylene oxide and then ethylene oxide) is introduced and added at 80 to 180 ° C. In the alkylene oxide addition reaction operation, after introducing a predetermined amount of alkylene oxide, it is more preferable to perform an operation (aging operation) for continuing the reaction until the pressure decreases and becomes constant. Furthermore, the target (a) component can be obtained by adding an appropriate amount of a known acid to the obtained reaction crude product to neutralize the catalyst. In the neutralization operation, it is also possible to remove the catalyst using an alkali adsorbent.

That is, the component (a) of the present invention is an aliphatic saturated linear alcohol (short chain alkyl group and long chain) represented by the following general formula (1 ′) in the presence of an alkali catalyst, for example, according to the above method. Propylene oxide is added to an alkyl group that satisfies the conditions of the present invention to produce a compound represented by the following general formula (1 ″), and then ethylene oxide is added thereto. it can.
R-O-H (1 ')
(In the formula, R represents a saturated linear hydrocarbon group having 6 to 24 carbon atoms.)
R—O— (PO) _m —H (1 ″)
(In the formula, R is a saturated straight-chain hydrocarbon group having 6 to 24 carbon atoms, PO is a propyleneoxy group, and m is an average added mole number and 0.1 ≦ m ≦ 15.)

<Liquid cleaning composition>
The liquid detergent composition of the present invention preferably contains 2 to 80% by weight, more preferably 3 to 70% by weight, of the component (a). The balance is water. When setting it as the liquid cleaning composition for clothes, content of (a) component is 3-70 weight%, Furthermore, 5-60 weight% is preferable, and the pH in 20 degreeC is 4-13, Furthermore, 5-12 are preferable. Moreover, when it is set as the liquid detergent composition for hard surfaces, such as tableware, a plastic, and a metal, content of (a) component is 2 to 60 weight%, Furthermore, 3 to 50 weight% is preferable, and the pH in 20 degreeC is 3. -13 and 4-12 are more preferable. Furthermore, when setting it as the liquid cleaning composition for light clothings, such as a composition for washing clothes by hand, 4-11 are preferable and, as for pH, 5-9 are more preferable.

  The liquid detergent composition of the present invention includes, in addition to the above essential components, higher fatty acids, solvents, known chelating agents, and anti-staining agents such as polyethylene glycol, carboxy, and the like within the range not inhibiting the effects of the present invention. As an emulsion such as methylcellulose, for example, polyvinyl acetate, vinyl acetate styrene polymer, polystyrene or the like can be blended. Further, sodium hydroxide, potassium hydroxide, alkanolamine, sulfuric acid, hydrochloric acid or the like can be used to adjust the pH. In addition, known thickeners, bleaches, enzymes, preservatives and the like can be blended. Furthermore, in order to further improve the detergency and the like, it can be combined with a nonionic surfactant other than the component (a), an anionic surfactant, a cationic surfactant, an amphoteric surfactant and the like. In addition, when other nonionic surfactant is contained, the ratio of the component (a) in the total nonionic surfactant is preferably 1 to 100% by weight, more preferably 10 to 100% by weight, particularly 30 to 100% by weight. Is preferred. Further, in the total surfactant, the ratio of the component (a) is 1 to 95% by weight, more preferably 5 to 90% by weight, and particularly preferably 10 to 80% by weight.

  The liquid detergent composition of the present invention can be used for clothing, for hard surfaces such as tableware, plastics and metals, for the body (hands, hair, face washing, etc.), and for cosmetics and cosmetics.

  In the liquid detergent composition of the present invention, the viscosity at 5 ° C. is preferably 170 mPa · s or less, more preferably 120 mPa · s or less, still more preferably 50 mPa, from the viewpoint of handling properties at the time of transfer and blending. -S or less. This viscosity is measured by the method of Examples described later.

1. Synthesis of nonionic surfactant (1) Synthesis of the product of the present invention 158 g of saturated linear alcohol having 10 carbon atoms, 400 g of saturated linear alcohol having 12 carbon atoms, 390 g of saturated linear alcohol having 14 carbon atoms, saturation of 16 carbon atoms A mixed alcohol (molar ratio: 18.5: 39.8: 33.7: 8) of 105 g of linear alcohol and 3.0 g of KOH were charged into an autoclave equipped with a stirrer, a temperature controller, and an automatic introduction device. Dehydration was performed at 3 kPa for 30 minutes. After dehydration, nitrogen substitution was performed, and after raising the temperature to 120 ° C., 626 g of propylene oxide was charged. Addition reaction and aging were performed at 120 ° C. to obtain propoxylate. Next, 2376 g of ethylene oxide was charged at 120 ° C. Addition reaction and aging were performed at 120 ° C. Then, after cooling to 80 ° C., 3.3 g of acetic acid was added to the autoclave, and the mixture was stirred at 80 ° C. for 30 minutes, and then extracted to obtain the nonionic surfactant (1) [general formula (1) of the present invention. R: C10 / C12 / C14 / C16 = 18.5 / 39.8 / 33.7 / 8 (molar ratio, “Cn” means a saturated straight-chain hydrocarbon group having n carbon atoms, Similarly, m = 2, n = 10].

The following nonionic surfactant was synthesized in the same manner.
Nonionic surfactant (2): In the general formula (1), R: C8 / C10 / C12 / C14 / C16 / C18 = 7.4 / 18.1 / 39 / 24.1 / 7.9 / 3. 5, m = 1.5, n = 7 nonionic surfactant Nonionic surfactant (3); in general formula (1), R: C8 / C10 / C12 / C14 / C16 = 14/23/32 2 / 25.5 / 5.3, m = 2, n = 9 nonionic surfactant Nonionic surfactant (4); in general formula (1), R: C8 / C10 / C12 / C14 / C16 = 20.5 / 28.1 / 23.8 / 16.6 / 11, m = 1.5, n = 9 nonionic surfactant Nonionic surfactant (5); in the general formula (1) , R: C8 / C10 / C12 / C14 / C16 = 7 / 17.4 / 59 / 12.8 / 3.8, m = 1, n = 0 nonionic surfactant Nonionic surfactant (6); In the general formula (1), R: C8 / C10 / C12 / C14 / C16 = 14.2 / 11.7 / 49.7 / 12.9 /11.5, m = 1.5, n = 10 nonionic surfactant

(2) Synthesis of comparative product (2-1) Comparative synthesis example 1
930 g of a saturated linear alcohol having 12 carbon atoms and 2.8 g of KOH were charged into an autoclave equipped with a stirrer, a temperature controller and an automatic introduction device, and dehydrated at 110 ° C. and 1.3 kPa for 30 minutes. After dehydration, nitrogen substitution was performed, and after heating up to 120 ° C., 580 g of propylene oxide was charged. Addition reaction and aging were performed at 120 ° C. to obtain propoxylate. Next, 2200 g of ethylene oxide was charged at 120 ° C. Addition reaction and aging were performed at 120 ° C. Then, after cooling to 80 ° C., 3.0 g of acetic acid was added to the autoclave, and the mixture was stirred for 30 minutes at 80 ° C., and then extracted to obtain a nonionic surfactant (7) of Comparative Example. This nonionic surfactant (7) is a comparative product having a single alkyl group composition [m in general formula (1) is 2 and n is 10].

(2-2) Comparative synthesis example 2
Mixed alcohol (molar ratio 18.5: 39) of 79 g of saturated straight chain alcohol having 10 carbon atoms, 200 g of saturated straight chain alcohol having 12 carbon atoms, 195 g of saturated straight chain alcohol having 14 carbon atoms, and 53 g of saturated straight chain alcohol having 16 carbon atoms. 8: 33.7: 8) and 1.5 g of KOH were charged into an autoclave equipped with a stirrer, a temperature controller, and an automatic introduction device, and dehydrated at 110 ° C. and 1.3 kPa for 30 minutes. After dehydration, nitrogen substitution was performed, the temperature was raised to 120 ° C., and 3132 g of propylene oxide was charged. Addition reaction and aging were performed at 120 ° C. to obtain propoxylate. Next, 1188 g of ethylene oxide was charged at 120 ° C. Addition reaction and aging were performed at 120 ° C. Thereafter, after cooling to 80 ° C., 1.7 g of acetic acid was added to the autoclave, and after stirring at 80 ° C. for 30 minutes, extraction was performed to obtain a nonionic surfactant (8) of Comparative Example. This nonionic surfactant (8) is a comparative product in which m is 20 and n is 10 in the general formula (1).

(2-3) Comparative Synthesis Example 3
Mixed alcohol (molar ratio 18.5: 39) of 53 g of saturated straight chain alcohol having 10 carbon atoms, 133 g of saturated straight chain alcohol having 12 carbon atoms, 130 g of saturated straight chain alcohol having 14 carbon atoms, and 35 g of saturated straight chain alcohol having 16 carbon atoms. 8: 33.7: 8) and 1.0 g of KOH were charged into an autoclave equipped with a stirrer, a temperature controller, and an automatic introduction device, and dehydrated at 110 ° C. and 1.3 kPa for 30 minutes. After dehydration, nitrogen substitution was performed, and after raising the temperature to 120 ° C., 209 g of propylene oxide was charged. Addition reaction and aging were performed at 120 ° C. to obtain propoxylate. Next, 4752 g of ethylene oxide was charged at 120 ° C. Addition reaction and aging were performed at 120 ° C. Then, after cooling to 80 ° C., 1.1 g of acetic acid was added to the autoclave, and the mixture was stirred for 30 minutes at 80 ° C., and then extracted to obtain a nonionic surfactant (9) of Comparative Example. This nonionic surfactant (9) is a comparative product in which m is 2 and n is 60 in the general formula (1).

(2-4) Comparative Synthesis Example 4
158 g of saturated linear alcohol having 10 carbon atoms, 400 g of saturated linear alcohol having 12 carbon atoms, 390 g of saturated linear alcohol having 14 carbon atoms, and 105 g of saturated linear alcohol having 16 carbon atoms (molar ratio 18.5: 39 8: 33.7: 8) and 3.0 g of KOH were charged into an autoclave equipped with a stirrer, a temperature controller, and an automatic introduction device, and dehydrated at 110 ° C. and 1.3 kPa for 30 minutes. After dehydration, nitrogen substitution was performed, the temperature was raised to 120 ° C., and 2376 g of ethylene oxide was charged. Addition reaction and aging were performed at 120 ° C. Then, after cooling to 80 ° C., 3.3 g of acetic acid was added to the autoclave, and the mixture was stirred at 80 ° C. for 30 minutes and then extracted to obtain a nonionic surfactant (10) of Comparative Example. This nonionic surfactant (10) is a comparative product in which m is 0 and n is 10 in the general formula (1).

(2-5) Comparative Synthesis Example 5
194 g of synthetic alcohol (trade name: SAFOL23, manufactured by SASOL, having an alkyl group with 12 and 13 carbon atoms, 50% branching rate) and 0.5 g of KOH are charged into an autoclave equipped with a stirrer, temperature controller, and automatic introduction device. Dehydration was performed at 110 ° C. and 1.3 kPa for 30 minutes. After dehydration, nitrogen substitution was performed, the temperature was raised to 120 ° C., and then 440 g of ethylene oxide was charged. Addition reaction and aging were performed at 120 ° C. Then, after cooling to 80 ° C., 0.6 g of acetic acid was added to the autoclave, and after stirring at 80 ° C. for 30 minutes, extraction was performed to obtain a nonionic surfactant (11) of Comparative Example. In the nonionic surfactant (11), R in the general formula (1) includes a branched alkyl group and does not include a short chain alkyl group, and m in the general formula (1) is 0, n Is a comparative product of 10.

(2-6) Comparative Synthesis Example 6
Stirrer of 65 g of 2-ethylhexanol, synthetic alcohol (trade name: ISOFOL12, manufactured by SASOL, having an alkyl group with 12 carbon atoms, 100% branching rate) 93 g of mixed alcohol (molar ratio 50:50) and KOH 0.5 g Then, it was charged into an autoclave equipped with a temperature control device and an automatic introduction device, and dehydrated at 110 ° C. and 1.3 kPa for 30 minutes. After dehydration, nitrogen substitution was performed, the temperature was raised to 120 ° C., and 116 g of propylene oxide was charged. Addition reaction and aging were performed at 120 ° C. to obtain propoxylate. Next, 440 g of ethylene oxide was charged at 120 ° C. Addition reaction and aging were performed at 120 ° C. Then, after cooling to 80 ° C., 0.6 g of acetic acid was added to the autoclave, and after stirring at 80 ° C. for 30 minutes, extraction was performed to obtain a nonionic surfactant (12) of Comparative Example. This nonionic surfactant (12) is a comparative product in which R in the general formula (1) is only a branched alkyl group, and R represents a short chain alkyl group (C8), a long chain alkyl group (C12), and In the general formula (1), m is 2 and n is 10.

(2-7) Comparative Synthesis Example 7
158 g of saturated linear alcohol having 10 carbon atoms, 400 g of saturated linear alcohol having 12 carbon atoms, 390 g of saturated linear alcohol having 14 carbon atoms, and 105 g of saturated linear alcohol having 16 carbon atoms (molar ratio 18.5: 39 8: 33.7: 8) and 3.0 g of KOH were charged into an autoclave equipped with a stirrer, a temperature controller, and an automatic introduction device, and dehydrated at 110 ° C. and 1.3 kPa for 30 minutes. After dehydration, nitrogen substitution was performed, and after raising the temperature to 120 ° C., an alkylene oxide mixture in which 626 g of propylene oxide and 2376 g of ethylene oxide were mixed was charged. Addition reaction and aging were performed at 120 ° C. Then, after cooling to 80 ° C., 3.3 g of acetic acid was added to the autoclave, stirred at 80 ° C. for 30 minutes, and then extracted to obtain a nonionic surfactant (13) of Comparative Example. This nonionic surfactant (13) is a comparative product [PO average addition mole number 2 and EO average addition mole number 10] in which PO and EO in the general formula (1) are randomly arranged.

(2-8) Comparative Synthesis Example 8
158 g of saturated linear alcohol having 10 carbon atoms, 400 g of saturated linear alcohol having 12 carbon atoms, 390 g of saturated linear alcohol having 14 carbon atoms, and 105 g of saturated linear alcohol having 16 carbon atoms (molar ratio 18.5: 39 8: 33.7: 8) and 3.0 g of KOH were charged into an autoclave equipped with a stirrer, a temperature controller, and an automatic introduction device, and dehydrated at 110 ° C. and 1.3 kPa for 30 minutes. After dehydration, nitrogen substitution was performed, the temperature was raised to 120 ° C., and 2376 g of ethylene oxide was charged. Addition reaction and aging were performed at 120 ° C. to obtain an ethoxylate. Next, 626 g of propylene oxide was charged at 120 ° C. Addition reaction and aging were performed at 120 ° C. Thereafter, after cooling to 80 ° C., 3.3 g of acetic acid was added to the autoclave, and the mixture was stirred for 30 minutes at 80 ° C. and then extracted to obtain a nonionic surfactant (14) of Comparative Example. This nonionic surfactant (14) is a comparative product having a structure of R—O— (EO) _n — (PO) _m —H in which PO and EO in the general formula (1) are reversed in block arrangement [PO Average addition mole number 2, EO average addition mole 10].

2. Preparation and evaluation of liquid detergent composition Using the nonionic surfactant obtained above and each component shown in Table 1, a liquid detergent composition was prepared according to the formulation shown in Table 1, and in the following manner. Fluidity (viscosity) evaluation at low temperature and detergency evaluation were performed. The results are shown in Table 2. In addition, the composition shown in Table 1 is weight% based on solid content of a compounding component. Moreover, the liquid cleaning composition of Table 1 is suitable as a liquid cleaning composition for clothing.

* In the table, the pH adjusting agent is sodium hydroxide and / or sulfuric acid, and these were used in an amount (indicated in the table as the adjusted amount) that gives a pH of 8.

(1) Viscosity The viscosity of the liquid detergent composition is a B-type viscometer [manufactured by Tokyo Keiki Co., Ltd., VISCOMETER MODEL DVM-B], used rotors 1 to 4, rotation speed 30 r / min, measurement time 60 It measured at 5 degreeC on the conditions of second.

  In this evaluation, the viscosity of the liquid detergent composition is preferably 150 mPa · s or less, more preferably 100 mPa · s or less, and still more preferably 50 mPa · s or less, from the viewpoint of handling properties at the time of transfer and blending. is there.

(2) Detergency (Preparation of collar red cloth)
A collar covering described in JIS K3362: 1998 is prepared.
(Cleaning conditions and evaluation method)
The detergency of the liquid detergent compositions in Table 1 was compared according to the method for evaluating the detergency of a synthetic detergent for clothing described in JIS K3362: 1998. The use concentration of the liquid detergent composition in Table 1 was 1.33 g / L.

  Comparative Example 1 was used as a blank, and the state (whiteness) of the washed collar fabric was observed and evaluated according to the following criteria. Further, the uneven color of the collar coat after washing was also evaluated according to the following criteria.

(Whiteness)
I ... Brightness better than blank
II: Whiteness slightly better than blank
III ... Whiteness equivalent to blank
IV ... Whiteness is inferior to blank (color unevenness)
I ... No color unevenness
II ... Slight color unevenness (equivalent to blank)
III ... Color unevenness

Claims (3)

It is represented by the following general formula (1), and R is composed of 5 to 95 mol% of a saturated straight chain hydrocarbon group having 11 or less carbon atoms and 5 to 95 mol% of a saturated straight chain hydrocarbon group having 12 or more carbon atoms. A liquid detergent composition containing a nonionic surfactant.
R—O— (PO) _m — (EO) _n —H (1)
(In the formula, R is a saturated linear hydrocarbon group having 6 to 24 carbon atoms, PO is a propyleneoxy group, m is an average addition mole number, 0.1 ≦ m ≦ 15, EO is an ethyleneoxy group, and n is an average addition. (0 <n ≦ 50 in terms of moles) Among the saturated linear hydrocarbon group having 12 or more carbon atoms of the nonionic surfactant, a saturated linear hydrocarbon group having 12 carbon atoms (R ₁₂ ) and a saturated linear hydrocarbon group having 13 or more carbon atoms (R _A ). The liquid detergent composition according to claim 1, wherein the molar ratio of R ₁₂ / R _A is 5/95 to 95/5.   The liquid detergent composition according to claim 1 or 2, wherein the nonionic surfactant is obtained by a production method including a step of adding an alkylene oxide to a raw material compound in the presence of an alkali catalyst.