WO2017097913A1

WO2017097913A1 - Dishwashing detergent composition

Info

Publication number: WO2017097913A1
Application number: PCT/EP2016/080280
Authority: WO
Inventors: Susie PARK; Edgar Endlein
Original assignee: Werner & Mertz Gmbh
Priority date: 2015-12-11
Filing date: 2016-12-08
Publication date: 2017-06-15
Also published as: EP3387097A1

Abstract

The present invention provides a dishwashing detergent composition, including an alkyl sulfate having a branched chain, wherein a refractive index of the dishwashing detergent composition is 0.10 or more to0.30 or less; a viscosity of the dishwashing detergent composition is 800 mPa⋅s or more to1800 mPa⋅s or less; and the dishwashing detergent composition includes the alkyl sulfate in a content of 0.1% by mass or more to 4.0% by mass or less, based on the total amount of the dishwashing detergent composition.

Description

[Document Name] Specification

[Title of Invention] DISHWASHING DETERGENT COMPOSITION

[Filed of the Invention]

[0001]

The present invention relates to a dishwashing detergent composition.

[Description of the Related Art]

[0002]

There is a custom to determine cleanliness of dishes by making sure that no dirt remains on dishes by

generating squeaking sound or the like by rubbing surface of dishes with bare hands, during dishwashing.

Accordingly, many people wash dishes with bare hands even when they possess kitchen gloves. There is also a custom to wash dishes by using a sponge with an undiluted

solution of a detergent directly applied thereto, leading to a high possibility that a high concentration

surfactant composition included in the detergent is brought into contact with the wet hand skin. Accordingly, a dishwashing detergent is required to be low in

irritation to the hand skin, and additionally to have necessary detergency. [0003]

Recently, consumers taking account of environmental consideration have been increasing in number, and the reduction of domestic wastewater has been considered to be one aspect of environmental consideration. In a dishwashing detergent, for example, by increasing the bubble extinguishment rate during rinsing, kitchen wastewater can be reduced. Accordingly, high bubble extinguishment property is also an important property in a dishwashing detergent.

[0004]

Moreover, the indoor temperature tends to be low in winter; in particular, a kitchen is a place tending to be cooled in a house. Accordingly, a dishwashing detergent is required to have a low-temperature stability.

[0005]

With respect to low irritation, for example, Non Patent Literature 1 discloses that the increase of the transepidermal water loss can be suppressed and irritant property can be reduced by adding an amphoteric

surfactant such as a fatty acid amide alkyl betaine to polyoxyethylene alkyl ether sulfate, an anionic

surfactant generally used in dishwashing detergents.

Patent Literature 1 also discloses a detergent

composition having an excellent detergency and mildness wherein a polyoxyethylene alkyl ether sulfate and a fatty acid amide alkyl betaine are used in combination. Patent Literature 2 discloses that the viscosity increase problem of the detergent can be solved by adding an alcohol as a viscosity suppressing agent. In addition, Patent Literature 3 discloses that an alcohol can be mixed as a component imparting low-temperature stability, in addition to as a viscosity suppressing agent.

[Citation List]

[Patent Literature]

[0006]

Patent Literature 1: National Publication of

International Patent Application No. 1998-504049

Patent Literature 2: Japanese Patent No. 5041113 Patent Literature 3: Japanese Patent NO. 2540435

[Non Patent Literature]

[0007]

Non Patent Literature 1: A. Tegila and G. Sechi, "Minimizing the Cutaneous Effects of Anionic Detergents, " Cosmetics and Toiletries magazine, Vol. Ill, August 1996, p 61

[Summary of the Invention]

[Problems to be Solved by the Invention]

[0008]

However, such detergent compositions as described in Non Patent Literature 1 and Patent Literature 1 sometimes undergo excessive increase of the viscosity of the detergent when the proportion of the addition amount of the fatty acid amide alkyl betaine to the addition amount of the polyoxyethylene alkyl ether sulfate is increased. With the excessive increase of the viscosity of the detergent, when dishes and the like are washed by using a sponge with an undiluted solution of a detergent directly applied thereto, sometimes the detergent is hardly impregnated into the inside of the sponge at the time of applying the detergent to the sponge.

[0009]

With respect to this problem, as described in Patent Literature 2, the excessive increase of the viscosity of the composition can be suppressed by adding alcohols such as ethanol, but there is a problem that the reduction effect of the increase of the transepidermal water loss, due to the fatty acid amide alkyl betaine is cancelled.

[0010]

When in conventional detergent compositions, a fatty acid amide alkyl betaine is added to a polyoxyethylene alkyl ether sulfate, the increase of the transepidermal water loss of the hand skin after dishwashing can be suppressed, but there is a problem of the excessive increase of the viscosity. With respect to this problem, the excessive increase of the viscosity of the

composition can be suppressed by adding alcohols such as ethanol, but there is a problem that the reduction effect of the increase of the transepidermal water loss, due to the fatty acid amide alkyl betaine is cancelled.

[0011]

In detergent compositions in the field of cosmetics, irritation reduction by allowing cosmetics to be free from alcohols has been investigated; however,

conventional dishwashing detergent frequently encounter the cases where the surfactant concentration is required to be higher than the concentration of the cosmetics, and thus, the conventional dishwashing detergent compositions are required to include an alcohol (s) as a viscosity adjuster to suppress the occurrence of high viscosity. Accordingly, dishwashing detergent compositions free from alcohol have hitherto been little investigated.

[0012]

Accordingly, an object of the present invention is to provide a dishwashing detergent composition having a necessary detergency, being capable of suppressing the transepidermal water loss of the hand skin after

dishwashing, and having an excellent impregnation ability into a sponge and an excellent bubble extinguishment property .

[Means for Solving the Problems]

[0013]

The present inventors made a continuous diligent study in order to solve the above-described problems of the prior art, and consequently have perfected the dishwashing detergent composition according to the present invention, by discovering that a dishwashing detergent composition having a branched alkyl sulfate having a branched chain, wherein the refractive index of the composition, the viscosity of the composition and the content of the alkyl sulfate fall within specific ranges, respectively, has a necessary detergency, is capable of suppressing the transepidermal water loss of the hand skin after dishwashing, and has an excellent impregnation ability into a sponge and an excellent bubble

extinguishment property.

[0014]

Specifically, the present invention is as set forth below .

[1]

A dishwashing detergent composition including an alkyl sulfate having a branched chain,

wherein a refractive index of the dishwashing detergent composition is 0.10 or more to 0.30 or less; a viscosity of the dishwashing detergent composition is 800 mPa-s or more to 1800 mPa-s or less; and

the dishwashing detergent composition comprises the alkyl sulfate in a content of 0.1% by mass or more to 4.0% by mass or less, based on the total amount of the dishwashing detergent composition. [2]

The dishwashing detergent composition according to [1], further comprising an amino surfactant, an alkyl ether sulfate and water.

[3]

The dishwashing detergent composition according to [2], further including a nonionic surfactant,

wherein a total of a content of the amino surfactant and a content of the alkyl ether sulfate is 10.0% by mass or more to 20.0% by mass or less, based on the total amount of the dishwashing detergent composition; and

a content ratio of the amino surfactant to the alkyl ether sulfate is 0.3 or more to 1.0 or less.

[4]

The dishwashing detergent composition according to

[3] ,

wherein 2-ethylhexyl sulfate is used as the alkyl sulfate having a branched chain;

cocamidopropyl betaine is used as the amino

surfactant ;

polyoxyethylene alkyl ether sulfate is used as the alkyl ether sulfate; and

an alkyl glycoside is used as the nonionic

surfactant .

[5]

The dishwashing detergent composition according to any one of [1] to [4], wherein a content of an alcohol compound is 1.5% by mass or less, based on the total amount of the

dishwashing detergent composition.

[Advantageous Effects of Invention]

[0015]

The dishwashing detergent composition according to the present invention has a necessary detergency, is capable of suppressing the transepidermal water loss of the hand skin after dishwashing, and has an excellent impregnation ability into a sponge and an excellent bubble extinguishment property.

[Detailed Description of the Preferred Embodiments]

[0016]

Hereinafter, the mode for carrying out the present invention (hereinafter, simply referred to as the

"present embodiment") is described in detail. The following present embodiment is an exemplification for describing the present invention, and is not intended to limit the present invention to the following contents. The present invention can be implemented as appropriately modified within the scope of the gist thereof.

[0017]

(Dishwashing Detergent Composition)

The dishwashing detergent composition of the present embodiment (hereinafter, also simply referred to as the "detergent composition" or the "composition") includes an alkyl sulfate having a branched chain (hereinafter, also referred to as the "branched alkyl sulfate, " the

"branched alkyl sulfate (a) , " the "component (a) " or

"(a)") . In the detergent composition of the present embodiment, the refractive index is 0.10 or more to 0.30 or less, and the viscosity is 800 mPa-s or more to 1800 mPa-s or less. Additionally, the detergent composition of the present embodiment includes the alkyl sulfate in a content of 0.1% by mass or more to 4.0% by mass or less, based on the total amount (100% by mass) of the detergent composition. The dishwashing detergent composition of the present embodiment has a necessary detergency, is capable of suppressing the increase of the transepidermal water loss of the hand skin after dishwashing, and has an excellent impregnation ability into a sponge and an excellent bubble extinguishment property.

[0018]

The detergent composition also preferably further includes an amino surfactant (hereinafter, also referred to as the "amino surfactant (b) , " the "component (b) " or "(b)"), an alkyl ether sulfate (hereinafter, also

referred to as the "alkyl ether sulfate (c) , " the

"component (c) " or "(c)"), and water (hereinafter, also referred to as "water (d) , " the "component (d) " or "(d)"). The detergent composition may also further includes a nonionic surfactant (hereinafter, also referred to as the "nonionic surfactant (e) , " the "component (e) " or "(e)").

[0019]

When in the composition of the present embodiment, the component (e) is further included, the total (total content) of the content of the component (b) and the content of the component (c) is 10.0% by mass or more to 20.0% by mass or less, based on the total amount (100% by mass) of the composition of the present embodiment, and additionally the ratio (content ratio) of the content of the component (b) to the content of the component (c) is 0.3 or more to 1.0 or less, more preferably the

composition of the present embodiment has a necessary detergency and a viscosity falling within an appropriate range, and the increase of the transepidermal water loss of the hand skin after dishwashing tends to be able to be suppressed; the ratio of the content of the component (b) to the content of the component (c) is further preferably 0.5 or more to 1.0 or less.

[0020]

The refractive index of the composition is 0.10 or more to 0.30 or less. The refractive index can be an index capable of measuring the concentration and the uniformity of the surfactant in the detergent composition of the present embodiment. The refractive index of 0.10 or more allows the detergent composition of the present embodiment to maintain the necessary detergency even in the case where the concentration of the detergent

composition is diluted in the course of the washing. The refractive index of 0.30 or less allows the detergent composition to suppress the increase of the

transepidermal water loss of the hand skin after

dishwashing, and to have an excellent bubble

extinguishment property. The refractive index is 0.10 or more, and preferably 0.15 or more. The refractive index is 0.30 or less and preferably 0.25 or less.

[0021]

The refractive index can be measured according to JIS K 0062:1992. The refractive index can be measured by using a refractometer (Model Rx-7000i, manufactured by

Atago Co., Ltd.), under a condition of 20°C.

[0022]

The viscosity of the composition is 800 mPa-s or more to 1800 mPa-s or less. For example, in a

composition including the component (a) , the component

(b) and the component (c) , the viscosity of 800 mPa-s or more is attained by including the component (b) in a predetermined proportion or more, allows the increase of the transepidermal water loss of the hand skin after dishwashing to be suppressed, and allows the composition to stay on the sponge over a longer time when the

composition is used for the dishwashing sponge. The viscosity of 1800 mPa-s or less allows the impregnation rate of the detergent composition into the sponge to fall within an appropriate range, and allows the composition to be easily discharged from the container of the

composition. The viscosity is 800 mPa-s or more,

preferably 850 mPa-s or more and more preferably 900 mPa-s or more. The viscosity is also 1800 mPa-s or less, preferably 1700 mPa-s or less and more preferably 1600 mPa-s or less.

[0023]

The viscosity can be measured according to JIS Z 8803:2011 (9: a viscosity measurement method with a single cylinder rotation viscometer) . The viscosity can be measured by using the detergent composition as a sample, with a viscometer (B-type Viscometer DV-I Prime, manufactured by Brookfield, Inc., spindle type: LV-2), under a condition of 20°C.

[0024]

The above-described refractive index and viscosity of the composition can be regulated by the combination or the contents of the below-described various surfactants. Specifically, the refractive index can be regulated by the content of one of, or the contents of two or more of the component (b) , the component (c) and the below- described component (e) . The viscosity of the

composition can be regulated by the combination of the components (a) and (b) or the composition ratio between the components (a) and (b) . [0025]

The component (a) of the composition is an alkyl sulfate having a branched chain, and is for example a component represented by following general formula (I) .

The component (a) is also to function as a viscosity adj uster .

R₁-O-SO₃M ... (I)

In formula (I), Ri represents an alkyl group having a branched chain, and M represents a metal atom.

[0026]

The number of the carbon atoms in the main chain of the alkyl group Ri in formula (I) is preferably 4 or more to 12 or less. When the number of the carbon atoms in the main chain falls within such a range, the necessary detergency and the suppression of the increase of the transepidermal water loss of the hand skin after

dishwashing tend to be more effectively obtained. The number of the carbon atoms of the main chain is

preferably 4 or more and more preferably 6 or more. The number of the carbon atoms of the main chain is

preferably 12 or less and more preferably 10 or less.

[0027]

The number of the carbon atoms in the branched chain of the alkyl group Ri in formula (I) is preferably 1 or more to 4 or less except for the carbon atom at the position bonded to the main chain. When the number of the carbon atoms of the branched chain falls within such a range, the necessary detergency and the suppression of the increase of the transepidermal water loss of the hand skin after dishwashing tend to be more effectively obtained. The number of the carbon atoms of the branched chain is preferably one or more, and more preferably 2 or more. Additionally, the number of the carbon atoms of the branched chain is preferably 4 or less and more preferably 3 or less.

[ 0 02 8 ]

M in formula (I) preferably represents sodium or potassium, and more preferably represents sodium.

[ 0 02 9 ]

The component (a) represented by formula (I) is the component represented by following general formula (II) in the case where the number of the carbon atoms in the main chain of the alkyl group Ri in formula (I) is 6 , and the number of the carbon atoms in the side chain of the alkyl group is 2 .

CH₃ (CH₂)₃CH(CH₂CH₃)CH₂OS0₃M ... (II)

In formula (II), M is the same in meaning as M in formula (I), and represents a metal atom.

[ 0 030 ]

M in formula (II) also preferably represents sodium or potassium, and more preferably represents sodium. [0031]

Specific examples of the component (a) include, without being particularly limited to: sodium 2- ethylhexyl sulfate.

[0032]

The components (a) may be used each alone or in combinations of two or more thereof.

[0033]

The content of the component (a) in the composition is 0.1% by mass or more to 4.0% by mass or less, based on the total amount (100% by mass) of the composition. The content of the component (a) falling within such a range allows the composition to be regulated so as to have an appropriate viscosity, allows the composition to be excellent in low-temperature stability, and allows the increase of the transepidermal water loss of the hand skin after dishwashing to be suppressed. The content of the component (a) is preferably 0.3% by mass or more to 4.0% by mass or less, more preferably 0.5% by mass or more to 3.5% by mass or less and further preferably more than 1.0% by mass to 3.0% by mass or less.

[0034]

The component (b) of the composition is an amino surfactant, and is a component represented by following general formula (III) . The component (b) can be allowed to function as an amphoteric surfactant. R₂-CONH-A ... (Ill)

In formula (III), R₂ represents an alkyl group, and A has a carboxylic acid or a hydroxyl group. The specific A can be represented by, for example, formula (IV) or formula (V) .

(CH₂)_x-N⁺(CH₃)₂-CH₂-COO^" ... (IV)

(CH₂CH₂0)_y-H ... (V)

[0035]

The number of the carbon atoms of R₂ in formula (III) is preferably 8 or more to 20 or less. When the number of the carbon atoms of R₂ falls within such a range, the necessary detergency and the suppression of the increase of the transepidermal water loss of the hand skin after dishwashing tend to be obtained more

effectively. The number of the carbon atoms of R₂ in formula (III) is constituted with an even number, an odd number or a mixture of even and odd numbers. Among these numbers, for the purpose of displaying a more excellent biodegradability, the component having an odd number of carbon atoms preferably accounts for 90% by mass or more.

[0036]

R₂ in formula (III) is also used as a mixture having 8 or more to 20 or less carbon atoms.

[0037]

In formula (IV), x is the average value of the x values of the respective molecules of the component (b) having A represented by formula (IV); x is preferably 1.0 or more to 4.0 or less because with such a value of x, the increase of the transepidermal water loss of the hand skin after dishwashing can be more suppressed.

[0038]

In formula (V) , y is the average value of the y values of the respective molecules of the component (b) having A represented by formula (V); y is preferably 1.0 or more to 4.0 or less, more preferably 1.5 or more to 2.5 or less and further preferably 2.0 or more to 3.0 or less because with such a value of y, the biodegradability of the composition comes to be excellent.

[0039]

The component (b) represented by formula (III) can include a component represented by following general formula (VI) in which A in formula (III) is represented by formula (IV), and x in formula (IV) is 3.

R2-CONH- (CH₂) 3- ⁺ (CH₃) 2-CH2-COO^" ... (VI)

In formula (VI), R2 is the same in meaning as R2 in formula (III), and represents an alkyl group.

[0040]

Specific example of the component (b) include, without particularly limited to: cocamidopropyl betaine and a fatty acid amide polyethoxylate .

[0041]

The components (b) may be used each alone or in combinations of two or more thereof. [0042]

The content of the component (b) in the composition is preferably 3.0% by mass or more to 15.0% by mass or less, based on the total amount (100% by mass) of the composition; when the content of the component (b) falls within such a range, the necessary detergency and the excellent bubble extinguishment property can be displayed more effectively, the composition tends to be allowed to be easily regulated so as to have an appropriate

viscosity, and the increase of the transepidermal water loss of the hand skin after dishwashing tends to be allowed to be more suppressed. The content of the component (b) is more preferably 4.0% by mass or more, further preferably 5.0% by mass or more and furthermore preferably 6.0% by mass or more. The content of the component (b) is also more preferably 14.0% by mass or less, further preferably 13.0% by mass or less and furthermore preferably 10.0% by mass or less.

[0043]

The total (hereinafter, also referred to as the "total content," or "(b) + (c)") of the content of the component (b) and the content of the component (c) in the composition is preferably 10.0% by mass or more to 20.0% by mass or less, based on the total amount (100% by mass) of the composition. When (b) + (c) is 10.0% by mass or more, the detergent composition tends to be able to maintain over a longer term the concentration capable of displaying the necessary detergency, for example, even in the case where the concentration of the detergent

composition is diluted in the course of the washing; (b) + (c) is more preferably 11.0% by mass or more and

further preferably 12.0% by mass or more. When (b) + (c) is 20.0% by mass or less, the composition tends to be able to be regulated so as to have an appropriate

viscosity while the addition amount of the viscosity adjuster is being suppressed, and the increase of the transepidermal water loss of the hand skin after

dishwashing tends to be able to be suppressed; (b) + (c) is more preferably 19.0% by mass or less, and further preferably 18.0% by mass or less.

[0044]

The ratio (hereinafter, also referred to as

"(b) /(c)") of the content of the component (b) to the content of the component (c) is preferably 0.3 or more to 1.0 or less. When (b) / (c) is 0.3 or more, both of the necessary detergency and the suppression of the increase of the transepidermal water loss of the hand skin after dishwashing tend to be achieved; (b) / (c) is more

preferably 0.4 or more and further preferably 0.5 or more. When (b) / (c) is 1.0 or less, the composition tends to be able to be regulated so as to have an appropriate

viscosity with a suppressed addition amount of the

viscosity adjuster, while the increase of the transepidermal water loss of the hand skin after

dishwashing is being suppressed.

[0045]

The component (c) of the present embodiment is an alkyl ether sulfate, and is a component represented by following general formula (VII) . The component (c) can also be allowed to function as a negative ionic

surfactant (anionic surfactant) .

Ri-O- (CH₂CH₂0) _z-S0₃N ... (VII)

In formula (VII), Ri represents an alkyl group, and N represents a metal atom.

[0046]

The number of the carbon atoms in the alkyl group Ri in formula (VII) is preferably 10 or more to 18 or less. When the number of the carbon atoms of the alkyl group Ri falls within such a range, the necessary detergency and the suppression of the increase of the transepidermal water loss of the hand skin after dishwashing tend to be obtained more effectively. The number of the carbon atoms of the alkyl group Ri is preferably 10 or more and more preferably 12 or more. The number of the carbon atoms of the alkyl group Ri is preferably 18 or less, more preferably 16 or less and further preferably 14 or less. The number of the carbon atoms of the alkyl group Ri is constituted with an even number, an odd number or a mixture of even and odd numbers. Among these numbers, for the purpose of displaying a more excellent

biodegradability, the number of carbon atoms is

preferably constituted only with an even number.

[0047]

N in formula (VII) represents preferably sodium or potassium, and more preferably sodium.

[0048]

In formula (VII), z is the average value of the z values of the respective molecules of the component (c) ; z is preferably 1.0 or more to 3.0 or less, more

preferably 1.0 or more to 2.5 or less and further

preferably 1.5 or more to 2.5 or less because with such a value of z, the biodegradability of the composition comes to be excellent.

[0049]

Specific examples of the component (c) include, without being particularly limited to: sodium lauryl ether sulfate.

[0050]

The components (c) may be used each alone or in combinations of two or more thereof.

[0051]

The content of the component (c) in the composition is preferably 1.0% by mass or more to 20.0% by mass or less, based on the total amount (100% by mass) of the composition. When the content of the component (c) is 1.0% by mass or more, the necessary detergency tends to be able to be displayed, and the composition tends to be able to maintain over a longer term the concentration capable of displaying the necessary detergency, for example, even in the case where the concentration of the detergent composition is diluted in the course of the washing; the content of the component (c) is more

preferably 2.0% by mass or more, further preferably 4.0% by mass or more, furthermore preferably 6.0% by mass or more and still furthermore preferably 7.0% by mass or more. When the content of the component (c) is 20.0% by mass or less, the increase of the transepidermal water loss of the hand skin after dishwashing tends to be suppressed; the content of the component (c) is more preferably 17.0% by mass or less, further preferably 13.0% by mass or less, furthermore preferably 12.0% by mass or less and still furthermore preferably 11.0% by mass or less.

[0052]

<Water: Component (d) >

The component (d) of the present embodiment is not particularly limited as long as the component (d) is water .

[0053]

The content of the component (d) in the composition is preferably 60% by mass or more to 95% by mass or less and more preferably 70% by mass or more to 90% by mass or less, based on the total amount (100% by mass) of the composition .

[0054]

The composition may further include a nonionic surfactant (e) in addition to the above described

component (a) , component (b) , component (c) and component

(d) .

[0055]

Specific examples of the component (e) include, without being particularly limited to: polyoxyethylene alkylether and alkyl glycoside. In particular, alkyl glycoside is preferable.

[0056]

Alkyl glycoside is a component represented by, for example, following general formula (VIII).

R₃-(0-G)_y-OH ... (VIII)

In formula (VIII), R3 represents an alkyl group having 8 or more to 18 or less carbon atoms, and G represents a glycoside group.

[0057]

The number of the carbon atoms of R₃ in formula (VIII) is 8 or more to 18 or less, and preferably 10 or more to 16 or less. The number of the carbon atoms of R₃ falling within such a range provides the necessary detergency and the suppression of the increase of the transepidermal water loss of the hand skin after

dishwashing .

[0058]

In formula (VIII), y is 1 or more to 3 or less and preferably 1 or more to 2 or less. The value of y falling within such a range provides a necessary and sufficient detergency and the suppression of the increase of the transepidermal water loss of the hand skin after dishwashing .

[0059]

Specific examples of alkyl glycoside include, without being particularly limited to: lauryl glucoside.

[0060]

The components (e) may be used each alone or in combinations of two or more thereof.

[0061]

The content of the component (e) in the composition is preferably 0.1% by mass or more to 5.0% by mass or less, based on the total amount (100% by mass) of the composition; when the content of the component (e) falls within such a range, the composition tends to be able to be easily regulated so as to have an appropriate

viscosity, and the increment of the transepidermal water loss of the hand skin after dishwashing tends to be able to be more suppressed. [0062]

It is preferable from the viewpoint of more

certainly achieving the operation and effect of the present invention that in the composition of the present embodiment, 2-ethylhexyl sulfate is used as the component

(a) , cocamidopropyl betaine is used as the component (b) , polyoxyethylene alkyl ether sulfate is used as the component (c) and alkyl glycoside is used as the

component (e) .

[0063]

Preservative : Component (f)>

The composition of the present embodiment may further include a preservative (hereinafter, also

referred to as the "preservative (f) , " the "component

(f) " or "(f)") in addition to the above-described

component (a) , component (b) , component (c) and component

(d) .

[0064]

Examples of the preservative include, without being particularly limited to: sorbic acid, potassium sorbate, L-lactic acid, sodium chloride, butyl p-hydroxybenzoate, propyl p-hydroxybenzoate, sodium benzoate and sodium propionate .

[0065]

The preservatives may be used each alone or in combinations of two or more thereof. [0066]

The acute oral toxicity (the median lethal dose in a rat, LD50, unit: dose weight (mg) per body weight (kg) of a rat) of the preservative in the composition is

preferably 2000 mg/kg or more, more preferably 3000 mg/kg or more and further preferably 4000 mg/kg or more because such an acute oral toxicity results in an excellent biodegradability of the composition.

[0067]

In the present embodiment, as the oral toxicity (median lethal dose, LD50), the value found in Registry of Toxic Effects of Chemical Substances (RTECS) is used.

[0068]

In the composition of the present embodiment, the content of the alcohol compound is preferably 1.5% by mass or less, based on the total amount (100% by mass) of the composition.

[0069]

Examples of the above-described alcohol compound include any compound having a hydroxyl group (s), without being particularly limited, such as methanol, ethanol, propyl alcohol, isopropyl alcohol, butyl alcohol and phenoxyethanol . Among these, the content of ethanol is more preferably 1.5% by mass or less, further preferably 1.0% by mass or less, furthermore preferably 0.5% by mass or less, and may be less than the detection limit value. The content of the alcohol compound being 1.5% by mass or less results in a tendency for the increase of the transepidermal water loss of the hand skin after

dishwashing to be able to be more suppressed. The content of the alcohol compound can be measured by, for example, gas chromatography.

[0070]

The composition of the present embodiment may further include additives in addition to the above- described components. Examples of the additives include, without being particularly limited to: a perfume, a dye, an aid, a stabilizer (for example, sodium chloride) and a natural extract.

[0071]

The increment of the transepidermal water loss in the composition of the present embodiment is the

increment of the transepidermal water loss in a three- dimensional epidermal model, and is preferably 5.0 g/ (m²-h) or less, more preferably 4.0 g/ (m²-h) or less and further preferably 3.0 g/ (m²-h) or less.

[0072]

The increment of the transepidermal water loss can be measured by using the "VAPOSCAN" (trade name)

manufactured by Asahi Biomed Co., Ltd. in a constant temperature-constant humidity chamber (temperature: 23 to

28°C, relative humidity: 15 to 25%) . Specifically, the increment of the transepidermal water loss can be measured by the method described in below-described

Examples .

[0073]

The biodegradability of the composition of the present embodiment is the biodegradability defined in 301A of the OECD test guideline; from the viewpoint of easy biodegradability, it is preferable that it take less than 10 days from the day when the biodegradability exceeds 10% to the day when the biodegradability exceeds 70%. It takes more preferably 8 days or less and further preferably 7 days or less from the day when the

biodegradability exceeds 10% to the day when the

biodegradability exceeds 70%.

[0074]

The detergent composition of the present embodiment is prepared by uniformly mixing with a stirrer the raw materials of the respective components.

Examples

[0075]

Hereinafter, the present embodiment is described more specifically with reference to specific Examples and Comparative Examples; the present embodiment is not limited by these Examples and Comparative Examples as long as the present embodiment does not exceed the gist thereof. The compositions of below-described Examples and Comparative examples were prepared by mixing the raw materials of the respective components, by stirring the resulting mixtures with a stirrer at 100 to 1000 rpm for 10 to 120 minutes, to uniformly mix the mixtures. The physical properties and the evaluations of these

compositions were measured and evaluated by the following methods .

[0076]

(Physical Property 1) Refractive Index

The refractive index of a composition was measured according to JIS K 0062:1992. The refractive index of each of the below-described respective detergent

compositions as the samples was measured by using a refractometer (Model "Rx-7000i, " manufactured by Atago

Co., Ltd.) under the condition of 20°C.

[0077]

(Physical Property 2) viscosity

The viscosity of each of the compositions was measured according to JIS Z 8803:2011 (9: a viscosity measurement method with a single cylinder rotation viscometer) . The viscosity of each of the below- described detergent compositions as the samples was measured by using a viscometer (B-type Viscometer DV-I Prime, manufactured by Brookfield, Inc., spindle type: LV-2), under the conditions of the number of rotations of 12 rpm and 20°C. [0078]

(Evaluation 1) Detergency

On an earthenware plate (Tamabuchi 9-inch rim meat plate, diameter: 23 cm), 5 g of a model dirt (based on the total amount of 100% by mass, 19% by mass of beef tallow, 14% by mass of vegetable oil, 11% by mass of skim milk, 19% by mass of wheat flour and 37% by mass of water were mixed so as to be uniform, and 0.2% by mass of a color material was added, based on the total mass of the above-described components) was placed, to prepare a model dirty plate. A fresh commercially available sponge

(Scotch Brite Sponge Scrubber, manufactured by 3M Co.) was impregnated with 2 g of each of the below-described detergent compositions and 150 mL of water, and bubbles were formed in a stainless steel bowl (diameter: 45 cm) . In a state of the sponge with bubbles attached thereto, the surface of the model dirty plate was washed clockwise 10 times and counterclockwise 10 times.

[0079]

The washing of the model dirty plates was continued, and when the bubbles on the surface of the aqueous solution composed of the detergent composition and water in the stainless steel bowl disappeared, the number of the plates having been washed by that time was checked, and the detergency of the detergent composition was evaluated on the basis of the following standards. O: Five or more plates

Δ: Three to four plates

X : Two or less plates

[0080]

(Evaluation 2) Increment of Transepidermal Water Loss The irritation property of each of the detergent compositions was evaluated by using a three-dimensional epidermal model (trade name "EPI-MODEL 24," manufactured by Japan Tissue Engineering Co., Ltd.), according to the OECD evaluation method (TG439) . Specifically, first, the epidermal model was precultured for 20 to 24 hours in an environment of 37°C, a CO₂ concentration of 5 to 10% and a humidity of 90% or more. Next, each of the below- described detergent compositions was diluted with pure water to a concentration of 2.0% by mass; 50 μL of the diluted composition was applied to the surface of the epidermal model for 1 hour; then, the surface of the epidermal model was washed with 25 mL of PBS+ (trade name "D8662," manufactured by SIGMA ALDRICH Corp.). Then, the epidermal model was cultured for 24 hours in an

environment of 37°C, a CO₂ concentration of 5 to 10% and a humidity of 90% or more; then, the transepidermal water loss (TEWL) of the epidermal model was measured by using the "VAPOSCAN" (trade name) manufactured by Asahi Biomed Co., Ltd. in a constant temperature-constant humidity chamber (temperature: 23 to 28°C, relative humidity: 15 to 25%) . With reference to the blank (an epidermal model to which PBS+ (trade name "D8662," manufactured by SIGMA ALDRICH Corp.) was applied), the TEWL increment due to the detergent composition was calculated on the basis of the following formula:

Increment of TEWL = (Average value of three TEWL measurement values of composition) - (average value of three TEWL measurement values of blank)

[0081]

From the increment of the TEWL obtained by the above-described calculation, the increment of the transepidermal water loss of the detergent composition was evaluated on the basis of the following standards.

®: The increment of TEWL is less than 3.0 g/ (m²-h) .

O: The increment of TEWL is 3.0 g/ (m²-h) or more to less than 4.0 g/ (m²-h) .

Δ: The increment of TEWL is 4.0 g/ (m²-h) or more to less than 5.0 g/ (m²-h) .

X: The increment of TEWL is 5.0 g/ (m²-h) or more.

[0082]

(Evaluation 3) Bubble Extinguishment Property

A fresh commercially available sponge (Scotch Brite Sponge Scrubber, manufactured by 3M Co.) was impregnated with 0.5 g of each of the below-described detergent compositions and 9.5 g of water, and the sponge was alternately squeezed and relaxed 20 times while bubbles were allowed to drop into a plastic beaker so as to form a lump of bubbles. Next, with a flow of tap water having a flow rate of 3 L/min, the bubbles in the beaker and the sponge were rinsed while the sponge was being alternately squeezed and relaxed.

[0083]

The period of time elapsed from the start of the rinsing to the completion of bubble generation from the sponge was measured, and the bubble extinguishment property of the detergent composition was evaluated on the basis of the following standards.

O: The period of time elapsed from the start of the rinsing to the completion of bubble generation from the sponge is less than 27 seconds.

Δ : The period of time elapsed from the start of the rinsing to the completion of bubble generation from the sponge is 27 seconds or more to less than 30 seconds.

X : The period of time elapsed from the start of the rinsing to the completion of bubble generation from the sponge is 30 seconds or more.

[0084]

(Evaluation 4) Impregnation Rate into Sponge

First, the mass of a fresh commercially available sponge (Scotch Brite Sponge Scrubber, manufactured by 3M Co.) was measured. The sponge was wetted with tap water and then squeezed, and then the mass of the sponge was measured; the measured mass was compared with the mass before wetting and thus the water amount in the sponge was regulated to 10 g. On the surface of the above- described wetted sponge, 0.2 mL of each of the below- described detergent compositions was placed dropwise by metering with a 1-mL syringe. The impregnation of the dropwise-placed droplets into the sponge was observed by using a contact angle meter (DM501, manufactured by Kyowa Interface Science Co., Ltd.).

[0085]

The period of time elapsed from the formation of the droplets of the detergent on the surface of the sponge to the disappearance of the droplets from the surface of the sponge due to the impregnation of the droplets into the sponge was measured, and the impregnation rate of the detergent composition into the sponge was evaluated on the basis of the following standards.

O: The period of time elapsed to the completion of the impregnation of the detergent into the sponge is less than 15 seconds.

Δ: The period of time elapsed to the completion of the impregnation of the detergent into the sponge is 15 seconds or more to less than 30 seconds.

X : The period of time elapsed to the completion of the impregnation of the detergent into the sponge is 30 seconds or more. [0086]

(Evaluation 5) Low-Temperature Stability

A detergent composition was stored under a condition of -5°C for 1 day, then stored under a condition of 20°C for 1 hour, and then unfreezed. This process was

repeated five times.

[0087]

The state of the detergent composition after the above-described process was observed, and the low- temperature stability of the detergent composition was evaluated on the basis of the following standards.

O: The detergent composition is transparent, undergoes no state change, and neither partial turbidity nor precipitation occurs.

X: Partial turbidity or precipitation occurs.

[0088]

(Evaluation 6) Biodegradability

The biodegradability of each of the below-described detergent compositions as the samples was measured according to 301A of the OECD test guide line.

[0089]

From the biodegradability obtained as described above for each of the below-described detergent

compositions, the biodegradability of each of the detergent compositions was evaluated on the basis of the following standards.

®: The period of time elapsed from the day when the biodegradability exceeds 10% to the day when the

biodegradability exceeds 70% is 7 days or less.

O: The period of time elapsed from the day when the biodegradability exceeds 10% to the day when the

biodegradability exceeds 70% is more than 7 days to 8 days or less.

Δ: The period of time elapsed from the day when the biodegradability exceeds 10% to the day when the

biodegradability exceeds 70% is more than 8 days to 10 days or less.

X : The period of time elapsed from the day when the biodegradability exceeds 10% to the day when the

biodegradability exceeds 70% is more than 10 days.

[0090]

Hereinafter, the contents of the compositions shown in Table 1 and Table 2 are presented.

Branched alkyl sulfate (a-1) (trade name

" SULFETAM4105 , " manufactured by Zschimmer & Schwarz GmbH & Co KG, content of sodium 2-ethylhexyl sulfate: 42% by mass )

Amino surfactant (b-1) (trade name "TEGO BETAIN F50," manufactured by Evonik Japan Co., Ltd., content of cocamidopropyl betaine: 38% by mass) Amino surfactant (b-2) (trade name "AMIDET N, " manufactured by Kao Chemicals Europe, S.L., content of fatty acid amide polyethoxylate: 93% by mass)

Anionic surfactant (c-1) (trade name "TEXAPON N70," manufactured by BASF Japan Ltd., content of sodium lauryl ether sulfate: 70% by mass)

Nonionic surfactant (e) (trade name "GLUCOPON

CSUP600," manufactured by BASF Japan Ltd., content of lauryl glucoside: 50% by mass)

Preservative (f) (sodium benzoate manufactured by Kanto Chemical Co., Inc.)

Stabilizer (sodium chloride, manufactured by Kanto Chemical Co., Inc.)

Alcohol compound (ethanol, manufactured by Kanto Chemical Co., Inc.)

[0091]

[Examples 1 to 4 and Comparative Examples 1 to 6]

The detergent compositions of Examples 1 to 4 and Comparative Examples 1 to 6 were prepared according to the compositions shown in Table 1, and the above- described measurements and the above-described

evaluations were performed. The results thus obtained are also shown in Table 1.

[0092] [Table 1]

In Table 1, the contents in the respective

compositions of the detergent compositions were related to the addition amounts of the effective components.

[0093]

[Examples 5 to 8 and Comparative Examples 7 to 13]

The detergent compositions of Examples 5 to 8 and Comparative Examples 7 to 13 were prepared according to the compositions shown in Table 2, and the above- described measurements and the above-described

evaluations were performed. The results thus obtained are also shown in Table 2.

[0094]

[Table 2]

In Table 2, the contents in the respective

compositions of the detergent compositions are related to the addition amounts of the effective components.

[0095]

The present application is based on Japanese Patent Application (Japanese Patent Application No. 2015-242417) filed at Japan Patent Office on December 11, 2015, and Japanese Patent Application (Japanese Patent Application No. 2015-242423) filed at Japan Patent Office on December 11, 2015, and the contents thereof are incorporated herein by reference.

[Industrial Applicability]

[0096]

The dishwashing detergent composition according to the present invention can be suitably utilized in the field of dishwashing.

Claims

What is claimed is:

1. A dishwashing detergent composition comprising an alkyl sulfate having a branched chain,

the dishwashing detergent composition comprises the alkyl sulfate in a content of 0.1% by mass or more to 4.0% by mass or less %, based on a total amount of the dishwashing detergent composition.

2. The dishwashing detergent composition according to claim 1, further comprising an amino surfactant, an alkyl ether sulfate, and water.

3. The dishwashing detergent composition according to claim 2, further comprising a nonionic surfactant,

4. The dishwashing detergent composition according to claim 3, wherein 2-ethylhexyl sulfate is used as the alkyl sulfate having a branched chain;