JP6666078B2 - Immersion cleaning composition for tableware and cleaning method - Google Patents

Description

  The present invention relates to a immersion cleaning composition for tableware and a cleaning method.

  When washing dishes in commercial facilities, hospitals, nursing homes, schools, business establishments, etc., a so-called commercial dishwasher suitable for washing a large amount of dishes in a short time is used. In washing dishes such as cooked rice using a commercial automatic dishwasher, the dishes are immersed in a solution obtained by diluting a dishwashing agent for hand washing, and then pre-washed with a sponge. Thereafter, washing is performed with a commercial automatic dishwasher.

Patent Document 1 discloses a liquid detergent composition containing dialkyl sulfosuccinates and amine oxides and having excellent detergency against oil and starch stains.
Patent Document 2 discloses a dishwashing composition for hand washing, containing a dialkyl sulfosuccinate, a fatty acid, a magnesium inorganic compound, an alkyl glycol alkyl ether and water.
Patent Document 3 discloses a dishwashing composition for hand washing containing a dialkyl sulfosuccinate, an anionic surfactant and an alkyl glyceryl ether.

JP 2008-507611 A JP 2012-140571 A JP 2011-2331311A

  The cleanliness of rice cooked and fixed on tableware differs depending on the state of its presence. In the state of solid particles, it can be washed by the physical force of the washing machine. However, when it becomes a slurry containing water and is dried, it becomes a starch thin film and remains on the tableware surface, making it difficult to remove. In addition, accumulation in the concave portions of the tableware due to aging makes it more difficult to wash. These starch stains are hard to confirm by visual observation after washing, and the remaining can be confirmed by spraying an iodine solution, but it is troublesome to perform this routinely. From the viewpoint of hygiene and the like, it is desired that invisible starch stains adhered to tableware can be reduced as much as possible by washing with a commercial automatic dishwasher.

  It is effective to clean the dried and fixed starch soil by contacting with water to swell the starch to reduce the affinity with the tableware. For example, if pre-soaking is carried out for a long time before washing, the dried and fixed starch stain can be easily removed. However, in many facilities, there is a strong demand to wash a large amount of tableware in a short time, and therefore, an immersion cleaning agent that shortens the immersion time as much as possible is desired.

  On the other hand, a composition containing a high concentration of dialkyl sulfosuccinate has disadvantages such as poor stability and poor usability due to poor viscosity and solubility. In each of Patent Documents 1 to 3, the concentration of dialkyl sulfosuccinate in the composition is not high. Therefore, in consideration of usability, transportation cost, and the like, a composition containing a high concentration of dialkyl sulfosuccinate and having improved low-temperature stability and solubility in hot water during use is desired.

  In general, for lunches and the like, plastic containers such as melamine, polycarbonate, and polyester are used. Although these containers are excellent in safety, they are affected by the solvent contained in the immersion cleaning agent, and their surface shapes change and deteriorate. For immersion cleaning of starch soil, a composition that does not adversely affect such containers is desired.

  The present invention improves the removability of cooked rice soil by washing in the automatic dishwasher by immersing the tableware to which the dried and adhered cooked rice soil adheres for a short time before washing in the automatic dishwasher. And, even if the surfactant concentration is high, the low-temperature stability is good, the solubility in hot water is excellent at the time of use, and the immersion detergent composition for tableware which does not deteriorate the tableware when used, and the use thereof The present invention relates to a method for cleaning dishes that have been washed.

  The present invention relates to (A) a dialkyl sulfosuccinate having two linear or branched alkyl groups having 8 or more and 18 or less carbon atoms or a salt thereof (hereinafter, referred to as a component (A)) of 55% by mass or more and 75% or more. The present invention relates to an immersion cleaning composition for tableware, which contains at most 0.5% by mass, (B) 0.5% by mass or more and 50% by mass or less of diethylene glycol monobutyl ether (hereinafter, referred to as component (B)) and water.

In addition, the present invention relates to a method for washing dishes, in which the following step 2 is performed after the following step 1 is completed.
Step 1: A cleaning liquid containing 0.0055% by mass or more and 3.75% by mass or less of the following (A) component, 0.00005% by mass or more and 2.5% by mass or less of the following (B) component, and water The step of immersing tableware.
(A) Component: dialkyl sulfosuccinate having two linear or branched alkyl groups having 8 or more and 18 or less carbon atoms or a salt thereof (B) Component: diethylene glycol monobutyl ether Step 2: Using an automatic dishwasher The step of washing dishes.

  In the present invention, the term “for tableware” includes both for tableware and cooking utensils. The tableware shall include a storage container for food.

  ADVANTAGE OF THE INVENTION According to this invention, before washing | cleaning with the automatic dishwasher, the tableware to which the dried and adhered rice soil adhered is immersed for a short time, and the removability of the cooked rice stain by the automatic dishwasher is improved. An improved immersion detergent composition for tableware which has improved and low-temperature stability during storage even when the surfactant concentration is high, has excellent solubility in hot water when used, and has no influence on tableware. The present invention provides a method for cleaning dishes using the same.

  The reason why the effects of the present invention are exhibited is not clear, but is presumed as follows. Starch soil swells upon contact with water and decreases in viscosity, thereby improving the ease of cleaning. In the usual immersion, a long immersion time was required because swelling occurred from outside the starch soil. On the other hand, the immersion detergent composition for tableware of the present invention improves the wettability from the boundary between the starch stain and the tableware to the internal voids by combining the component (A) and the component (B). It is considered that the swelling of the starch proceeds from both inside and outside of the soil. In addition, it is considered that the component (B) appropriately controls the thickening caused by mixing the component (A) with water, and suppresses the thickening. As a result, it is considered that starch dirt can be easily removed by immersion for a short time, and it is considered that the cleaning property of starch dirt by washing using an automatic dishwasher could be improved.

(Dishwashing detergent composition for dishes)
<(A) component>
The component (A) of the present invention is a dialkyl sulfosuccinate having two linear or branched alkyl groups having 8 to 18 carbon atoms or a salt thereof. Specific examples include dialkyl sulfosuccinates represented by the following general formula (I).

[In the formula, R ¹ and R ² each represent a linear or branched alkyl group having 8 or more and 18 or less carbon atoms. M is an inorganic or organic cation. ]

R ¹ and R ² in the general formula (I) may be the same or different. The number of carbon atoms of R ¹ and R ² is preferably 5 or more, more preferably 6 or more, still more preferably 7 or more, from the viewpoint of further improving the starch removing property, and 18 from the viewpoint of further improving the starch removing property. The following is preferable, 14 or less is more preferable, and 10 or less is still more preferable.
In the general formula (I), R ¹ and R ² are each specifically an n-octyl group, a nonyl group, a decyl group, a dodecyl group, a tridecyl group, a 2-ethylhexyl group, a sec-octyl group, an isopentyl group And an alkyl group selected from an isononyl group, an isodecyl group, and a cyclohexyl group, preferably a group selected from an n-octyl group, a sec-octyl group, a decyl group, an isodecyl group, and a 2-ethylhexyl group.
In the general formula (I), M is selected from an inorganic cation selected from hydrogen ion, sodium ion, potassium ion, lithium ion, magnesium ion and ammonium ion, monoethanolammonium ion, diethanolammonium ion and triethanolammonium ion. Organic cations, preferably cations selected from sodium ions, potassium ions, magnesium ions, and ammonium ions. Preferably, they are a sodium ion and a potassium ion, and a sodium ion is more preferable.

The method for preparing a compound having the same R ¹ and R ² in the general formula (I) is not particularly limited, but for example, refer to the method described in US Pat. No. 2,028,091. An asymmetric compound having different R ¹ and R ² can be produced, for example, by referring to the method described in JP-A-58-24555. When a commercially available compound is used, Toho Chemical Industry Co., Ltd. Airroll CT-1K (compound in which both R ¹ and R ² are 2-ethylhexyl groups), Sanyo Chemical Industries Co., Ltd. Sanmorin OT-70S (R ¹ , R ² is compound both 2-ethylhexyl group), manufactured by Kao Corp. PELEX ^{OT-P (R} 1, compound ^{R 2} are both 2-ethylhexyl group), the PELEX TR ^(R 1, ^{R 2} are both A compound that is a tridecyl group), Luensite A-BO (a compound in which both R ¹ and R ² are 2-ethylhexyl groups) manufactured by BASF, and aerosol A-196 (R ¹ , R ² ) available from Mitsui Cytec Co., Ltd. Are both cyclohexyl groups).

<(B) component>
The component (B) of the present invention is diethylene glycol monobutyl ether. The component (B) improves the low-temperature stability and the solubility in hot water during use with respect to the composition of the present invention containing the component (A) at a predetermined concentration. In addition, by using a predetermined amount of the component (B), damage to plastic tableware can be reduced.

<Water>
The dishwashing detergent composition of the present invention contains water. Water is used in an amount that will be the balance of the composition. The content of each component in the composition is% by mass based on the total amount of components including water, unless otherwise specified.

<Other ingredients>
The immersion detergent composition for tableware of the present invention preferably further contains propylene glycol as the component (C) from the viewpoint of further improving hot water solubility and low-temperature stability.

  The immersion detergent composition for tableware of the present invention preferably further contains ethanol as the component (D) from the viewpoint of further improving low-temperature stability.

  The dishwashing detergent composition of the present invention is a solvent, a hydrotrope, a dispersant, a pH adjuster, a thickener, a viscosity adjuster, a fragrance, a colorant, an antioxidant, as long as the object of the present invention is not impaired. Components such as preservatives, preservatives, foam inhibitors, bleaching agents, and bleaching activators (excluding components (A) to (D)) can be added.

<Composition etc.>
The dishwashing detergent composition of the present invention contains the component (A) in an amount of 55% by mass or more and 75% by mass or less. The dishwashing detergent composition for dishes according to the present invention comprises the component (A) in an amount of preferably at least 57% by mass, more preferably at least 60% by mass, from the viewpoint of further improving starch stain removal properties and low-temperature stability. From the viewpoint of further improving hot water solubility and low-temperature stability, the content is preferably 73% by mass or less, more preferably 70% by mass or less.

  The dishwashing detergent composition of the present invention contains the component (B) in an amount of 0.5% by mass or more and 50% by mass or less. The immersion detergent composition for tableware of the present invention contains the component (B) in an amount of preferably 1.0% by mass or more, more preferably 2% by mass or more, from the viewpoint of further improving low-temperature stability. From the viewpoint of damageability, the content is preferably 20% by mass or less, more preferably 10% by mass or less, further preferably 7% by mass or less, and still more preferably 5% by mass or less.

  In the immersion detergent composition for tableware of the present invention, the mass ratio (A) / (B) of the component (A) and the component (B) is preferably from the viewpoint of low-temperature stability and further improvement of non-damage to tableware. Is 1.1 or more, more preferably 2 or more, still more preferably 5.5 or more, and still more preferably 10 or more. Then, the mass ratio is preferably 130 or less, more preferably 100 or less, still more preferably 80 or less, still more preferably 50 or less, and still more preferably 25 or less, from the viewpoint of further improving the solubility in warm water.

  The dishwashing detergent composition of the present invention contains the component (C) in an amount of preferably 10% by mass or more, more preferably 11% by mass or more, and still more preferably 12% by mass or more, from the viewpoint of further improving hot water solubility. From the viewpoint of further improving low-temperature stability, the content is preferably 16% by mass or less, more preferably 15% by mass or less, and even more preferably 14% by mass or less.

  The dishwashing detergent composition of the present invention contains the component (D) in an amount of preferably 0.3% by mass or more, more preferably 0.5% by mass or more, from the viewpoint of further improving hot water solubility and low-temperature stability. From the viewpoint of further improving low-temperature stability, the content is preferably 8% by mass or less, more preferably 5% by mass or less, and further preferably 1% by mass or less.

  The dishwashing detergent composition of the present invention preferably contains water in an amount of 5% by mass or more, more preferably 10% by mass or more, still more preferably 15% by mass or more, and preferably 40% by mass or less, more preferably The content is 30% by mass or less, more preferably 25% by mass or less.

  The pH at 25 ° C. of the immersion detergent composition for tableware of the present invention is preferably 4 or more, more preferably 5 or more, from the viewpoint of further improving the removability of starch stains. From the viewpoint, it is preferably 12 or less, more preferably 10 or less, and still more preferably 8 or less. The pH can be measured according to JIS K 3362: 2008 8.3.

  The viscosity at 25 ° C. of the immersion detergent composition for tableware of the present invention is preferably 10 mPa · s or more, more preferably 30 mPa · s or more, and more preferably 30 mPa · s or more, from the viewpoint of further improving handleability and hot water solubility. Is 200 mPa · s or less, more preferably 180 mPa · s or less. The viscosity can be measured according to the description of JIS Z 8803: 2011. Specifically, the viscosity is measured using a B-type viscometer manufactured by TOKIMEC under the conditions of rotor: No. 1, rotation speed: 30 rpm. be able to.

<How to wash dishes>
The present invention relates to a dishwashing method for performing the following step 2 after completion of the following step 1.
Step 1: A cleaning liquid containing 0.0055% by mass or more and 3.75% by mass or less of the following (A) component, 0.00005% by mass or more and 2.5% by mass or less of the following (B) component, and water The step of immersing tableware.
(A) Component: dialkyl sulfosuccinate having two linear or branched alkyl groups having 8 or more and 18 or less carbon atoms or a salt thereof (B) Component: diethylene glycol monobutyl ether Step 2: Using an automatic dishwasher The step of washing dishes.

The content of the component (A) in the cleaning solution is preferably 0.057% by mass or more, more preferably 0.060% by mass or more, from the viewpoint of further improving the detergency of starch stains. From the viewpoint of improvement, it is preferably 0.75% by mass or less, more preferably 0.38% by mass or less, further preferably 0.15% by mass or less, still more preferably 0.1% by mass or less, and still more preferably 0% by mass or less. 0.08 mass% or less, more preferably 0.07 mass% or less.
In addition, the content of the component (B) in the cleaning solution is preferably 0.00005% by mass or more, more preferably 0.001% by mass or more, and still more preferably 0.002% by mass, from the viewpoint of further improving hot water solubility. % Or more, and preferably 0.5% by mass or less, more preferably 0.25% by mass or less, further preferably 0.1% by mass or less, and still more preferably 0% by mass or less, from the viewpoint of further improving the damageability to tableware. 0.05% by mass or less, more preferably 0.02% by mass or less, still more preferably 0.01% by mass or less, even more preferably 0.005% by mass or less.

  The components (A) and (B) used in the dishwashing method of the present invention are the components (A) and (B) described in the above-mentioned immersion detergent composition for dishes, and the preferred embodiments are also the same. It is.

The washing liquid used in the dishwashing washing method of the present invention preferably contains propylene glycol as the component (C).
Further, the washing liquid used in the washing method for washing dishes according to the present invention preferably contains ethanol as the component (D). The component (C) and the component (D) are the component (C) and the component (D) described in the above-mentioned dishwashing detergent composition, and the preferred embodiments are also the same.

  When the component (C) is contained, the concentration of the component (C) in the cleaning solution is preferably 0.001% by mass or more, more preferably 0.012% by mass or more, from the viewpoint of further improving hot water solubility. It is. From the viewpoint of further improving low-temperature stability, the content is preferably 0.8% by mass or less, more preferably 0.08% by mass or less.

  When the component (D) is contained, the concentration of the component (D) in the cleaning solution is preferably 0.00003% by mass or more, more preferably 0.0005% by mass or more, from the viewpoint of further improving low-temperature stability. It is. From the viewpoint of further improving low-temperature stability, the content is preferably 0.4% by mass or less, more preferably 0.04% by mass or less.

  The washing liquid used in the step 1 is preferably prepared from the dishwashing detergent composition of the present invention. More specifically, it is a cleaning solution obtained by diluting the dishwashing detergent composition of the present invention with water. It is preferred that the dishwashing detergent composition of the present invention is diluted with water so that the concentrations of the components (A) and (B) fall within the above ranges. Further, from the viewpoint of further improving the removability of starch stains, the dishwashing detergent composition of the present invention is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, further preferably 0.1% by mass or more, with water. It is used after being diluted to 1% by mass or more, preferably 5% by mass or less, more preferably 1% by mass or less, further preferably 0.5% by mass or less, and still more preferably 0.2% by mass or less.

  In step 1, from the viewpoint of further improving the removability of starch stains, the dishes are added to the washing liquid, preferably for 1 minute or more, more preferably 3 minutes or more, still more preferably 5 minutes or more, and from the same viewpoint, preferably The immersion is performed for 120 minutes or less, more preferably 90 minutes or less, further preferably 60 minutes or less, and still more preferably 30 minutes or less. In immersion, the dishes may be hand-washed with a sponge or the like.

  The temperature of the cleaning solution is preferably 20 ° C. or higher, more preferably 30 ° C. or higher, and still more preferably 40 ° C. or higher, from the viewpoint of further improving the detergency of starch soil, and is preferably from the viewpoint of economy and safety. Is 60 ° C. or less, more preferably 55 ° C. or less, and still more preferably 50 ° C. or less. The temperature of the cleaning liquid may be a temperature before the tableware is immersed. Preferably, the temperature is maintained during immersion.

  In addition, the pH of the cleaning solution is preferably 5 or more, more preferably 6 or more, from the viewpoint of further improving the detergency of starch stains, and is preferably 12 or less, more preferably 11 or less, from the viewpoint of safety. Preferably it is 9 or less. This pH may be a pH at a temperature at the time of immersion. This pH may be the pH at 20 ° C. of the cleaning solution.

Immersion of tableware can be performed using an immersion tank containing a cleaning liquid. What is generally called a sink can be used for the immersion tank. The volume of the sink used for business purposes varies depending on the size of the washing room in the kitchen. For example, a sink having a volume of 0.1 m ³ or more and 3 m ³ or less can be used. The dishes are preferably completely immersed in the cleaning solution. It is preferred to combine the immersion tank with the volume to completely immerse the tableware and the amount of the washing liquid.

<Step 2>
In step 2, the dishes that have been immersed in the cleaning liquid in step 1 are washed using an automatic dishwasher.
The tableware immersed in the cleaning solution in step 1 may not be rinsed with water or may be rinsed with water.
The automatic dishwasher used in step 2 may be any automatic dishwasher generally available on the market, and a home automatic dishwasher can also be used. Further, the washing conditions in the step 2 are not particularly limited, and the kind of the detergent, the washing temperature, the washing time and the like can be carried out according to known washing conditions by an automatic dishwasher. The automatic dishwasher used in step 2 is preferably a commercial automatic dishwasher.

<Method of preparing immersion detergent composition for tableware>
Dishwashing detergent compositions for dishes shown in Tables 1, 2 and 3 below were prepared as follows.
(1) The component (A) was heated and dissolved at 150 ° C. to 180 ° C. for 20 minutes.
(2) The component (C) was gradually added to and mixed with the dissolved component (A).
(3) After confirming that the mixture was uniformly dissolved, the mixture was gradually cooled to 70 ° C. or lower.
(4) Due to the high temperature, the dispersed (C) component was added and the preparation was performed, and then ion-exchanged water was gradually added and mixed.
(5) After confirming that the mixture was uniformly dissolved, the mixture was gradually cooled to 40 ° C. or lower, and then the component (B) was gradually added and mixed.
(6) After confirming that the mixture was uniformly dissolved, the component (D) was gradually added and mixed.
(7) It was confirmed that the mixture was uniformly dissolved, and a dishwashing detergent composition was obtained.
Here, with respect to the compositions of Comparative Examples 1-1 to 1-4 in Table 1, a immersion detergent composition for tableware was prepared using the compounds shown in Table 1 instead of the component (B).

Here, the components used are as follows.
Component (A): di-2-ethylhexyl sulfosuccinate sodium salt (manufactured by Tokyo Chemical Industry, reagent: 100% product)
-Component (B): diethylene glycol monobutyl ether (product name: BDG-NS (manufactured by Nippon Emulsifier Co., Ltd.))
-Component (C): propylene glycol (manufactured by Asahi Glass Co., Ltd.)
-Component (D): ethanol (first-class reagent)

<Evaluation method>
The following evaluation was performed using the obtained dishwashing detergent composition for dishes.
[I] Removability of starch dirt (1) Inside a melamine bowl with a diameter of 12 cm and a height of 4.5 cm and a semicircular shape from the side, cooked rice cooked with a rice cooker is viewed from a flat surface. A strip having a width of 3 cm and a length of 16 cm was overlapped with the diameter and rubbed so that rice grains did not remain. The temperature of the cooked rice was 40 ± 10 ° C.
(2) The melamine tea bowl rubbed with rice was left for 2 hours in a room adjusted to 25 ° C. ± 5 ° C., and it was confirmed by tentacles that the rubbed rice was dried and solidified.
(3) 800 mL of hot water at 45 ° C. was placed in a polypropylene vat having a length of 18.7 cm, a width of 12.8 cm, and a height of 6.0 cm, and 0.8 g of the dishwashing detergent composition described in the table was charged. Was prepared. The concentration of the dishwashing detergent composition in the washing solution was 0.1% by mass.
(4) The bowl was immersed in a cleaning solution for 5 minutes so that half of the area rubbed with cooked rice was immersed (Step 1), and then taken out.
(5) The removed bowl is set in a 1-door type dishwasher (SANYO DR53 manufactured by Sanyo Electric Co., Ltd.) within 1 minute, and the washing temperature is 50 ° C, the washing time is 40 seconds, the rinsing temperature is 80 ° C, and the rinsing is performed. Washing was performed for 10 seconds (step 2). The washing liquid tank (38 L) of the washing machine was prepared in advance with a commercial automatic dishwashing detergent (Axial New Star AN: manufactured by Kao Corporation) so that the concentration was 0.15% by mass. I have. Further, in this dishwasher, the concentration of the cleaning liquid contained in the cleaning liquid tank is controlled to be constant during the cleaning.
(6) After the washing was completed, the degree of coloring using the iodinated starch reaction was checked in order to check the washability of the cooked rice soil inside the removed bowl.
(7) An iodine solution (reagent: 0.01 N) was sprayed on the entire inside of the bowl, rinsed with warm water at 40 ° C. ± 5 ° C. for 10 seconds, and the degree of coloring of the immersed portion was visually determined. The evaluation of starch stain removability was evaluated according to the following five-level evaluation criteria.
5: Very slight coloring is observed in the immersed portion (very slightly starch stain remains).
4: Slight coloring is observed in the immersed portion.
3: Coloring is observed in the immersed part.
2: Many coloring is observed in the immersed part.
1: Very much coloring is observed in the immersed portion (equivalent to the case where the dishwashing detergent composition described in the table is not charged).

[II] Low-temperature stability The immersion detergent composition for tableware described in the table was put in a 100-ml glass container (Maruem Co., No. 8, 40 mm x 120 mm), 80 ml was sealed, and stored at -5 ° C for 14 days. The appearance of the liquid was evaluated according to the following five-level evaluation criteria.
5: Uniformly transparent (no turbidity is observed).
4: Turbidity is recognized very slightly.
3: Turbidity is slightly observed.
2: Turbidity is observed.
1: Turbidity is observed and two-layer separation is occurring.

[III] Hot water solubility 800 mL of hot water (45 ° C. ± 5 ° C.) was charged into a 1000 mL beaker. Then, 0.8 g of the dishwashing detergent composition described in the table was put therein, and the mixture was gently stirred 10 times in a circle with a polypropylene rod having a diameter of 10 mm and a length of 330 mm for 5 minutes. It was left still. After standing, sediment in the lower layer of the beaker was visually confirmed. Warm water solubility was evaluated according to the following five-level evaluation criteria.
5: No residual melting (dissolved by standing for 5 minutes).
4: Very little undissolved residue is observed (dissolved by standing for 10 minutes).
3: Slight undissolved part is observed (dissolved by standing for 20 minutes).
2: Residual melting is observed (dissolved by standing for 40 minutes).
1: Many undissolved residues are observed (dissolved by standing for 60 minutes).

[IV] Rate of mass change The immersion detergent composition for dishes described in the table was diluted with ion-exchanged water to a 1% by mass solution, and placed in a 100 ml glass container (No. 11, manufactured by AS ONE Corporation, diameter 40 mm × height 75 mm). 100 g was charged to obtain a washing liquid. A melamine resin test piece (30 mm × 80 mm × 3 mm), which had been measured in advance (significant digits up to the fourth decimal place), was immersed in the washing solution with an electronic balance CPA224S (manufactured by sartorius) and sealed. After storage at 50 ° C. for 10 days, the test piece was taken out, washed with water, dried at room temperature and weighed. The rate of change in mass due to immersion in the dishwashing detergent composition was determined according to the following equation and determined. In addition, the mass change rate of the test piece when performing the above-mentioned immersion evaluation in ion-exchanged water was 0%.
Mass change rate (%) = (initial mass-mass after storage) / initial mass The value of the mass change rate was evaluated according to the following five-level evaluation criteria.
5: 0% or more and less than 0.5% 4: 0.5% or more and less than 2% 3: 2% or more and less than 5% 2: 5% or more and less than 10% 1: 10% or more

Claims (5)

  (A) a dialkyl sulfosuccinate having two linear or branched alkyl groups having 8 or more and 18 or less carbon atoms or a salt thereof (hereinafter, referred to as a component (A)) of 55% by mass or more and 75% by mass or less; (B) Diethylene glycol monobutyl ether (hereinafter, referred to as component (B)) containing 0.5% by mass or more and 50% by mass or less, and water, and the mass ratio of component (A) to component (B) (A) / (B) 10 or more and 25 or less, the dishwashing detergent composition.   2. The dishwashing detergent composition according to claim 1, further comprising (C) propylene glycol.   The dishwashing detergent composition according to claim 1, further comprising (D) ethanol. A method for washing dishes, in which the following step 2 is performed after the following step 1 is completed.
Step 1: The following component (A) contains 0.0055% by mass or more and 3.75% by mass or less, the following component (B) contains 0.00005% by mass or more and 2.5% by mass or less, and water, A step of immersing the tableware in a cleaning liquid having a mass ratio (A) / (B) of the component (A) and the component (B) of 10 or more and 25 or less for 5 minutes or more and 30 minutes or less.
(A) Component: dialkyl sulfosuccinate having two linear or branched alkyl groups having 8 or more and 18 or less carbon atoms or a salt thereof (B) Component: diethylene glycol monobutyl ether Step 2: Using an automatic dishwasher The step of washing dishes. The dishwashing method according to claim 4 , wherein the washing liquid in step 1 is a washing liquid obtained by diluting the immersion dishwashing composition for dishes according to any one of claims 1 to 3 with water.