JP2010047730A - Liquid detergent composition for dishwasher - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid detergent composition for a dishwasher, the composition having favorable cleaning power on protein stains or the like and preventing stains of pigments such as tea stains caused by repeated use. <P>SOLUTION: The liquid detergent composition for a dishwasher contains a polymer compound having a structural unit derived from a vinyl monomer having a cationic group and a structural unit derived from maleic acid or its salt in the molecule, with a proportion of the cationic group to the anionic group in the range of (cationic group)/(anionic group)=30/70 to 70/30 in terms of an equivalent ratio, having a weight-average molecular weight of 5,000 to 100,000 and containing no SO<SB>2</SB>group. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a detergent composition for a dishwasher.

  A dishwasher is a facility for washing dishes such as dirty dishes, glasses and cooking utensils, and is used in kitchens such as homes, restaurants and coffee shops. In general, dishwashing is performed in the order of washing process-rinsing process. In the washing process, a non-foaming or low-foaming dishwasher cleaner different from a dishwashing detergent for hand washing is used. In addition, a rinsing agent is used in the rinsing process for commercial dishwashers used in kitchens such as restaurants and coffee shops.

It is known that a detergent for a dishwasher is blended with a polymer compound for hydrophilizing the surface for the purpose of reducing water spots. For example, in Patent Documents 1 and 2, by using a polymer compound containing a structural unit derived from a cationic monomer and a nonionic surfactant in combination, it is possible to remove dirt without using a rinsing agent. It is disclosed that it is possible to provide a cleaning composition for a dishwasher that can accelerate drying, reduce water spots, and the like.
JP 2007-99811 A, JP 2007-119753 A

  However, tableware washed with a detergent for dishwashers containing a surface hydrophilized polymer compound, depending on the type of the polymer compound (molecular weight, constituent monomer, etc.) may be used repeatedly, such as tea astringent stains, It has been found that contamination may occur. Since the polymer compound used in Patent Documents 1 and 2 is a useful component such as a water spot can be reduced by using this, and a rinse agent is unnecessary, it is a system in which such a polymer compound is blended. It is desirable to be able to prevent the occurrence of pigment stains such as tea astringent stains that are manifested by repeated use. At that time, it is necessary that the detergency against other dirt such as protein dirt is also good.

  An object of the present invention is to provide a detergent composition for a dishwasher that has good detergency against protein stains and the like, and can prevent the occurrence of pigment stains such as tea astringent stains due to repeated use.

The present invention has a structural unit derived from a vinyl monomer having a cationic group and a structural unit derived from maleic acid or a salt thereof in the molecule, and the ratio of the cationic group to the anionic group is equivalent. Ratio of cationic group / anionic group = 30/70 to 70/30, weight average molecular weight of 5,000 to 100,000, and a detergent for dishwashers containing a polymer compound not containing SO ₂ groups Relates to the composition.

  ADVANTAGE OF THE INVENTION According to this invention, the washing | cleaning composition for tableware washing machines which can prevent generation | occurrence | production of pigment | dye stain | pollution | contamination, such as tea astringent stain | pollution | contamination by repeated use etc., is provided.

<(A) component>
The vinyl monomer having a cationic group constituting the component (A) (hereinafter referred to as a cationic monomer) is preferably a monomer having at least one group selected from an amino group and a quaternary ammonium group. Furthermore, a polymer compound having a structural unit derived from a cationic monomer represented by the following formula (I) and / or a cationic monomer represented by the following formula (II) is preferable.

[In formula, R < ¹ >, R < ² >, R < ³ >, R < ⁷ >, R <^8> , R <^9> is respectively independently a hydrogen atom, a hydroxyl group, or a C1-C3 alkyl group. X, Y are each independently an alkylene group having 1 to 12 carbon ^{atoms, -COOR 12 -, - CONHR 12} -, - OCOR 12 -, - a group selected from - R ¹³ -OCO-R ^12. Here, R ¹² and R ¹³ are each independently an alkylene group having 1 to 5 carbon atoms. R ⁴ is an alkyl group having 1 to 3 carbon atoms or a hydroxyalkyl group, or R ¹ R ² C═C (R ³ ) —X—. R ⁵ is an alkyl group having 1 to 3 carbon atoms, a hydroxyalkyl group, or a benzyl group, and R ⁶ is an alkyl group having 1 to 10 carbon atoms that may be substituted with a hydroxy group, a carboxyl group, a sulfonic acid group, or a sulfate group. When it is an alkyl group or a benzyl group, and R ⁶ is an alkyl group, a hydroxyalkyl group or a benzyl group, Z ⁻ represents an anion. When R ⁶ contains a carboxyl group, a sulfonic acid group, or a sulfate group, Z ⁻ does not exist and R ⁶
These groups inside become anions. Examples of the anion of Z ⁻ include a halogen ion, a sulfate ion, an alkyl sulfate ester ion having 1 to 3 carbon atoms, an aromatic sulfonate ion optionally substituted with an alkyl group having 1 to 3 carbon atoms, and a hydroxy ion. Can be mentioned. R ¹⁰ is a hydrogen atom, an alkyl group having 1 to 3 carbon atoms or a hydroxyalkyl group, or R ⁷ R ⁸ C═C (R ⁹ ) —Y—. R ¹¹ is a hydrogen atom, an alkyl group having 1 to 3 carbon atoms, or a hydroxyalkyl group. ]

  Specifically preferred as the compound of formula (I) are acryloyl (or methacryloyl) aminoalkyl (C1-5) -N, N, N-trialkyl (C1-3) quaternary ammonium salt, acryloyl ( Or methacryloyl) oxyalkyl (C1-5) -N, N, N-trialkyl (C1-3) quaternary ammonium salt, N- (ω-alkenyl (C2-10))-N, N, N-trialkyl (C1-3) quaternary ammonium salt, N, N-di (ω-alkenyl (C2-10))-N, N-dialkyl (C1-3) quaternary Ammonium salts are preferred, and diallyldimethylammonium salt is particularly preferred.

  Particularly preferred as the compound of formula (II) are acryloyl (or methacryloyl) aminoalkyl (C1-5) -N, N-dialkyl (C1-3) amine, acryloyl (or methacryloyl) oxyalkyl ( 1 to 5 carbon atoms-N, N-dialkyl (1 to 3 carbon atoms) amine, N- (ω-alkenyl (2 to 10 carbon atoms))-N, N-dialkyl (1 to 3 carbon atoms) amine, N, N-di (ω-alkenyl (2 to 10 carbon atoms))-N-alkyl (1 to 3 carbon atoms) amine, allylamine, diallylmethylamine, diallylamine are preferred, and in particular, allylamine, diallylmethylamine, Diallylamine, acryloyl (or methacryloyl) aminopropyl-N, N-dimethylamine, acryloyl (or methacryloyl) oxyethyl -N, N-dimethylamine is good.

  The structural unit derived from the formula (I) and / or the formula (II) is preferably contained in a proportion of 10 to 99 mol% with respect to the total monomer units. More preferably, it is contained in a proportion of 20 to 99 mol%, more preferably 30 to 90 mol%.

  The component (A) of the present invention has a structural unit derived from maleic acid or a salt thereof as a structural unit derived from an anionic monomer.

The component (A) of the present invention can contain a structural unit derived from an anionic monomer other than maleic acid or a salt thereof. In that case, a cationic monomer and an anionic monomer (maleic acid or a salt thereof and other The molar ratio of the sum of the anionic monomers) is preferably cationic monomer / anionic monomer = 10/90 to 90/10, more preferably 30/70 to 90/10, and particularly preferably 50/50 to 70/30. Examples of other anionic monomers include monomers selected from the following (i).

  (I) Acrylic acid or a salt thereof, methacrylic acid or a salt thereof, styrene sulfonate, 2-acrylamido-2-methylpropane sulfonate, allyl sulfonate, vinyl sulfonate, methallyl sulfonate, sulfopropyl Compounds selected from methacrylates and mono-ω-methacryloyloxyalkyl phosphates (having 1 to 12 carbon atoms)

  In the component (A) of the present invention, the ratio of the cationic group to the anionic group is equivalent ratio, and the cationic group / anionic group = 30/70 to 70/30, preferably 40/60 to 60 / 40, more preferably 45/55 to 55/45. In the component (A) of the present invention, the anionic monomer copolymerized with the cationic monomer is maleic acid or a salt thereof, and the charge density per unit weight is different. Compared to the case where other anionic monomers such as acrylic acid are used, it is assumed that an excellent effect is exhibited. From this viewpoint, it is considered that the component (A) has a cationic group / anionic group equivalent ratio closer to 50/50 in terms of the effect of the present invention. Examples of the anionic group include a carboxyl group derived from maleic acid or a salt thereof and a sulfonic acid group possessed by other anionic monomers. Here, the equivalent ratio of the cationic group / anionic group can be calculated from the charged amount of the raw material component when the component (A) is produced.

  Moreover, the component (A) of the present invention can also contain a structural unit derived from a nonionic monomer. Examples of the nonionic monomer include monomers selected from the following (ii) to (iv).

  (Ii) Acrylic (or methacrylic) amide, N, N-dimethylaminopropylacrylic acid (or methacrylic acid) amide, N, N-dimethylacrylic (or methacrylic) amide, N, N-dimethylaminoethylacrylic acid (or methacrylic) Acid) amide, N, N-dimethylaminomethylacrylic acid (or methacrylic acid) amide, N-vinyl-2-caprolactam, N-vinyl-2-pyrrolidone-containing compound

  (Iii) Acrylic acid (or methacrylic acid) alkyl (1 to 5 carbon atoms), acrylic acid (or methacrylic acid) 2-hydroxyethyl, acrylic acid (or methacrylic acid) -N, N-dimethylaminoalkyl (1 carbon atom) -5), ester group-containing compound selected from vinyl acetate

  (Iv) ethylene, propylene, n-butylene, isobutylene, n-pentene, isoprene, 2-methyl-1-butene, n-hexene, 2-methyl-1-pentene, 3-methyl-1-pentene, 4-methyl Olefin compounds selected from -1-pentene, 2-ethyl-1-butene, styrene, vinyltoluene, and α-methylstyrene

  Among these, the monomer unit derived from the monomer (i) or (ii) is particularly preferable from the viewpoint of finish, and the monomer unit derived from the monomer (i) is most preferable, and among these, acrylic acid or its sodium salt or potassium Preference is given to salts, methacrylic acid or its sodium or potassium salt, maleic acid or its sodium or potassium salt. Here, the counter ion of the monomer unit derived from the monomer (i) may be a cationic group portion of the polymer to be contained.

  The component (A) of the present invention preferably contains only a structural unit derived from a cationic monomer and a structural unit derived from maleic acid or a salt thereof as a structural unit. The molar ratio of the cationic monomer to maleic acid or a salt thereof is, from the viewpoint of surface adsorption power, cationic monomer / maleic acid or a salt thereof = 10/90 to 90/10, more preferably 30/70 to 90/10, and even more. 50 / 50-80 / 20, especially 50 / 50-70 / 30 are preferable.

  In addition, in the component (A) of the present invention, the total of the structural units derived from the cationic monomer and the structural units derived from maleic acid or a salt thereof is 50 to 80 mol%, more preferably 55 to 75 mol in all the structural units. %, And more preferably 60 to 70 mol%.

  The component (A) of the present invention has a weight average molecular weight of 5,000 to 100,000, preferably 8,000 to 60,000, more preferably 10,000 to 60,000, and particularly preferably 10,000 to 10,000, from the viewpoint of finishing properties and suppression of pigment stain generation. The weight average molecular weight is determined by gel permeation chromatography using polyethylene glycol as a standard substance with a mixed solvent of acetonitrile and water (phosphate buffer solution) as a developing solvent.

  In the component (A), a cationic monomer, maleic acid or a salt thereof, another anionic monomer, or a nonionic monomer may be present in either the main chain or the side chain in the polymer. These may be randomly polymerized, block polymerized, or graft polymerized.

  The component (A) of the present invention is preferably a polymer compound containing a structural unit derived from a cationic monomer represented by the formula (I), and more preferably a polymer compound having a structural unit derived from a diallyldimethylammonium salt. In particular, a copolymer polymer compound of diallyldimethylammonium salt and maleic acid or a salt thereof is preferable.

In addition, the component (A) of the present invention is a polymer compound that does not contain an SO ₂ group in the molecule. The SO ₂ group includes those incorporated into the main chain as —SO ₂ — and those present in the side chain.

<Cleaning composition for dishwasher>
In the detergent composition for a dishwasher of the present invention, the component (A) is preferably 0.5 to 4% by weight, more preferably 0.6 to 3% by weight, from the viewpoint of finish and suppression of pigment stains. %, More preferably 0.8 to 2.5% by weight, still more preferably 1 to 2% by weight.

  The detergent composition for a dishwasher according to the present invention has a pH of 10 to 13 and further 11 to 12 at 25 ° C. of a stock solution (in the case of a liquid composition) or a 1 wt% aqueous solution (in the case of a solid composition). Preferably there is. In the case of liquid compositions, the balance is usually water. In the case of a liquid composition, it is preferable that a 1% by weight aqueous solution also has a pH in the above range.

  The dishwasher cleaning composition of the present invention can contain a compound called a builder. As the action mechanism of the builder, a metal chelate action, an alkali buffer action, and a solid particle dispersion action are important.

  Examples of inorganic builders include phosphates, carbonates, silicates, and sulfates. Specifically, sodium pyrophosphate, potassium pyrophosphate, sodium tripolyphosphate, potassium tripolyphosphate, sodium orthophosphate, sodium hexametaphosphate, sodium carbonate, potassium carbonate, sodium bicarbonate, sodium sulfate, sodium silicate, potassium silicate, metasilicate Sodium etc. are mentioned. Moreover, alkali metal hydroxides such as sodium hydroxide and potassium hydroxide are also included.

  Examples of the organic builder include (a) ethane-1,1-diphosphonic acid, ethane-1,2-diphosphonic acid, ethane-1-hydroxy-1,1-diphosphonic acid and its derivatives, ethanehydroxy-1,1,2 -Phosphonic acid salts such as triphosphonic acid, ethane-1,2-dicarboxy-1,2-diphosphonic acid, methanehydroxyphosphonic acid, (b) 2-phosphonobutane-1,2-dicarboxylic acid, 1-phosphonobutane-2 , 3,4-tricarboxylic acid, salt of phosphonocarboxylic acid such as α-methylphosphonosuccinic acid, (c) salt of amino acid such as aspartic acid, glutamic acid, (d), nitrilotriacetic acid salt, ethylenediaminetetraacetic acid salt Aminopolyacetates such as (e) diglycolic acid, oxydisuccinic acid, carboxymethyloxysuccinic acid, cyclopentane-1, , 3,4-tetracarboxylic acid, tetrahydrofuran-1,2,3,4-tetracarboxylic acid, tetrahydrofuran-2,2,5,5-tetracarboxylic acid, citric acid, lactic acid, tartaric acid, oxalic acid, sulfosuccinic acid, Examples thereof include salts of organic acids such as malic acid and gluconic acid, (f) polyacrylic acid salt, polyacrylic acid / polymaleic acid copolymer polymer compound and salts thereof.

  From the viewpoint of detergency, ion sequesterability and anti-recontamination property, the total builder amount is preferably 5 to 99.9% by weight, more preferably 10 to 99%, based on the detergent composition for dishwashers of the present invention. % By weight, particularly preferably 15 to 99% by weight.

  In addition, an anionic surfactant, a nonionic surfactant, an amphoteric surfactant, an enzyme, a bleaching agent, an antifoaming agent, a rust preventive agent, a hydrotrope agent, a surface modifier, a fragrance and the like can be contained. The total amount of the surfactant may be 10% by weight or less, further 6% by weight or less in the composition.

  As the above components, those described in International Publication No. 99/58633 pamphlet can be referred to.

  In use, the detergent composition for a dishwasher of the present invention is preferably used as a cleaning solution diluted to an appropriate concentration with water or the like, and the concentration of the component (A) in the cleaning solution is the finish and From the viewpoint of suppressing the occurrence of pigment stain, it is preferably 2 to 50 ppm (weight ratio), more preferably 3 to 50 ppm, still more preferably 5 to 40 ppm, and particularly preferably 5 to 30 ppm.

  The present invention relates to a detergent composition for use in a dishwasher. In particular, the present invention relates to a detergent composition for use in a commercial dishwasher. The cleaning composition for a dishwasher according to the present invention reduces the water spot by accelerating the drying of dishes and glasses at the same time as removing dirt in the cleaning of tableware such as ceramics, glass and plastic without using a rinse agent. Enable. Moreover, even when the treated tableware is used repeatedly, no stains such as tea astringent stains occur, and a beautiful feeling of use can be maintained.

  In the case of washing with a commercial dishwasher using the detergent composition for a dishwasher of the present invention, the composition is arbitrarily transferred into a commercial dishwasher by a supply device, and the proper composition is transferred. The concentration of the cleaning solution is maintained. When the product form of the dishwasher detergent composition is liquid, the tube dedicated to the dishwasher for business use is directly inserted into a plastic container filled with the dishwasher detergent composition. Supplied. When the form of the detergent composition for a dishwasher is solid or powder, the plastic dish or the like container filled with the detergent composition for a dishwasher is placed in a predetermined direction. Set or transfer the dishwasher cleaning composition filled in a pouch container etc. to a commercial dishwasher hopper, spray water or warm water with a spray or shower, etc. The cleaning solution dissolved and sprayed is supplied to the inside of the commercial dishwasher.

  The dishwasher cleaning composition of the present invention is used at a concentration of 0.05 to 0.5% by weight in the cleaning liquid, but from the viewpoint of economy and cleaning properties, 0.05 to 0.3% by weight % Is preferable, and 0.05 to 0.2% by weight is more preferable. The washing time for tableware is preferably 10 seconds to 3 minutes, more preferably 20 seconds to 2 minutes, from the viewpoint of detergency. The cleaning temperature of the cleaning liquid is very important for improving the cleaning performance in a short time, and is preferably 40 ° C. or more, and particularly preferably 40 to 70 ° C. After the dishes have been washed, it is usually preferable to quickly rinse with warm water at 60 to 90 ° C. in the same commercial dishwasher. The cleaning composition for a dishwasher according to the present invention can accelerate drying of dishes and reduce water spots without using a rinse agent, so that rinsing should be performed only with hot water at 60 to 90 ° C. Can do.

  In a commercial dishwasher, when washing dishes continuously, the cleaning liquid is circulated with a pump and repeatedly used for washing.

  In the case of continuously washing dishes with a commercial dishwasher, the concentration of the washing liquid decreases with the number of washings due to carry-out of the washing liquid by tableware or carry-over of rinsing water to the washing tank. In order to maintain an appropriate concentration of the cleaning liquid, the dishwasher cleaning composition is supplied to an appropriate concentration by an automatic supply device.

  The automatic supply apparatus for the dishwasher cleaning composition is not particularly limited, but the product form of the dishwasher cleaning composition is liquid by sensing the concentration of the cleaning liquid and receiving a signal. If it is, if it is powder or solid, spray water or warm water on the detergent composition for the dishwasher in the form of a spray or shower to obtain the necessary amount of detergent for the dishwasher Supply the composition.

  This automatic supply device is preferably used for business use with a very large number of cleanings per day, and has the advantage that it saves a lot of time compared to manual feeding for each cleaning frequency. It becomes easy to maintain a proper concentration in the middle (during washing).

  A detergent composition for a dishwasher having the composition shown in Table 1 was prepared, and the tea astringent stain prevention property and detergency were evaluated by the following methods. The results are shown in Table 1.

[1] Tea astringent stain prevention / evaluation method 57g (0.15%) of the detergent composition for dishwashers was put into the washing tank (38L) of a commercial dishwasher [SANYO DR53 manufactured by Sanyo Electric Co., Ltd.] Control the concentration with a quantitative pump until the end of the test. Two cups made of tempered glass (84 mm in diameter) were set in a dedicated rack, washed with a cleaning solution at 60 ° C. for 40 seconds, and then rinsed with rinsing water at 80 ° C. for 10 seconds without using a rinse agent. After removing two tempered glass cups from the dedicated rack, pour the boiled black tea “Assam 2.5 g / hot water (90 ° C. or higher): 110 g” and leave it for 10 seconds, and then discard it. After this treatment was repeated 20 times, the adhesion state of tea astringent stains on the tempered glass cup was evaluated.

* Judgment criteria for adhesion of tea astringent stains ◎;
○: Slight coloring marks are observed.
Δ: Clearly colored marks are observed.
×: Colored marks are observed inside the cup, and more adherent.

[2] Detergency / Production of model dirt On the center of a new 20 cm diameter porcelain dish, 2 g of egg yolk was uniformly applied with a brush in a circular shape with a diameter of about 10 cm and placed in an electric dryer set at 80 ° C. After 30 minutes, the porcelain dish coated with egg yolk was taken out, and naturally cooled was used as a model soil for protein stains.
Evaluation method Dish 4 in which 57 g of neutral detergent composition for dishwasher was placed in a washing tank (38 L) of a commercial dishwasher [SANYO DR53 manufactured by Sanyo Electric Co., Ltd.] and model dirt was applied to a dedicated rack Sheets were set, and 4 dishes made of porcelain were washed for 40 seconds with a washing solution at 50 ° C. The porcelain dishes coated with protein stains were colored with a 1% by weight aqueous solution of erythrosine dye, and the detergency was evaluated according to the following criteria.

* Criteria for cleaning protein stains ◎: No color marks are observed, and the stains are completely removed ○: Slight color marks are observed, but most of the stains are removed △; Dirt remains ×; most of the color marks are observed and a lot of dirt remains.

In the table, the compounding amounts of the polymer compounds A to H are the numerical values of the active ingredients. The components in the table are as follows.
Polymer compound A: monomer unit (a) diallyldimethylammonium chloride, monomer unit (b) maleic acid [(a) / (b) = 66/34 (molar ratio)], copolymer having a weight average molecular weight of 15000 ( Cationic group / anionic group = 49/51 equivalent ratio, used as an aqueous solution with an effective content of 30% by weight)
Polymer compound B: monomer unit (a) diallyldimethylammonium chloride, monomer unit (b) maleic acid [(a) / (b) = 66/34 (molar ratio)], copolymer having a weight average molecular weight of 25000 ( Cationic group / anionic group = 49/51 equivalent ratio, used as an aqueous solution with an effective content of 30% by weight)
Polymer compound C: monomer unit (a) diallyldimethylammonium chloride, monomer unit (b) maleic acid [(a) / (b) = 66/34 (molar ratio)], copolymer having a weight average molecular weight of 40000 ( Cationic group / anionic group = 49/51 equivalent ratio, used as an aqueous solution with an effective content of 30% by weight)
Polymer compound D: monomer unit (a) diallyldimethylammonium chloride, monomer unit (b) acrylic acid [(a) / (b) = 70/30 (molar ratio)], copolymer having a weight average molecular weight of 17,000 ( Cationic group / anionic group = 70/30 equivalent ratio, used as an aqueous solution with an effective content of 36% by weight)
Polymer compound E: monomer unit (a) diallyldimethylammonium chloride, monomer unit (b) acrylic acid [(a) / (b) = 50/50 (molar ratio)], copolymer having a weight average molecular weight of 45500 ( Cationic group / anionic group = 50/50 equivalent ratio, used as an aqueous solution with an effective content of 35% by weight)
Polymer compound F: monomer unit (a) diallyldimethylammonium chloride, monomer unit (b) acrylic acid [(a) / (b) = 50/50 (molar ratio)], copolymer having a weight average molecular weight of 83,000 ( Cationic group / anionic group = 50/50 equivalent ratio, used as an aqueous solution with an effective content of 35% by weight)
Polymer compound G: monomer unit (a) diallyldimethylammonium chloride, monomer unit (b) acrylic acid [(a) / (b) = 64/36 (molar ratio)], copolymer having a weight average molecular weight of 450,000 ( Cationic group / anionic group = 64/36 equivalent ratio), Merquat 280 (manufactured by Calgon), used as an aqueous solution with an effective content of 40% by weight)
Polymer compound H: monomer unit (a) diallyldimethylammonium chloride, monomer unit (b) maleic acid, monomer unit (c) SO ₂ [(a) / (b) / (c) = 67/27/6 ( Molar ratio)], a copolymer having a weight average molecular weight of 23000 (cationic group / anionic group = 53/47 equivalent ratio, used as an aqueous solution having an effective content of 25% by weight)
・ Poly potassium acrylate: oligomer M3 (manufactured by Kao Corporation)
・ Acrylic acid / maleic acid copolymer, sodium salt: Sokalan CP5 Granules (BASF)

Claims (2)

The molecule has a structural unit derived from a vinyl monomer having a cationic group and a structural unit derived from maleic acid or a salt thereof, and the ratio of the cationic group to the anionic group is an equivalent ratio, A detergent composition for a dishwasher comprising a high molecular compound having a functional group / anionic group = 30/70 to 70/30, a weight average molecular weight of 5,000 to 100,000, and no SO ₂ group.   The detergent composition for a dishwasher according to claim 1, wherein the vinyl monomer having a cationic group constituting the polymer compound is a monomer having at least one group selected from an amino group and a quaternary ammonium group.