JPH108094A - Cleanser composition for dish washer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject composition containing an alkali metal hydroxide and a specific glycine diacetic acid derivative, excellent in biodegradability and washability and useful for automatic dish washers. SOLUTION: This cleanser composition for hard surfaces comprises (A) 1-60wt.% of an alkali metal hydroxide such as sodium hydroxide or potassium hydroxide and (B) 1-50wt.% of a glycine-N,N'-diacetic acid derivative of the formula (M is H, Na, K, NH4 ; R is a 1-18C alkyl, alkenyl) as essential components, preferably further (C) 1-90wt.% of a water-soluble carbonate or silicate and (D) 0.5-10wt.% of an anionic water-soluble polymer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning agent for hard surfaces, and more particularly to a cleaning agent for automatic dishwashers.

[0002]

2. Description of the Related Art In a site where a large amount of dishes are washed, such as a hotel, a restaurant, a lunch center, and an office lunch,
Since 1965, automatic dishwashing machines have been widely spread, and conveyor dishwasher type, door type, under counter type, etc. automatic dishwashing machines have been introduced. Although these devices have different appearances, basically, cleaning agents are sprayed from upper and lower spray nozzles to wash away food residues on tableware.

[0003] The detergents used in such dishwashers include an alkaline agent for promoting the decomposition and solubilization of oil and fat stains and protein stains, which are food residue on tableware, a polymer compound for dispersing stains, It is basically composed of a sequestering agent or the like that promotes dissolution and dispersion in an alkaline detergent solution by capturing metal ions therein.

[0004] Among these components, the sequestering agent is a substance for more effectively exhibiting the performance of the detergent, and is one of the important components.

[0005] In clothing detergents, phosphorus compounds such as tripolyphosphates were previously blended as sequestering agents. However, phosphorus compounds are considered as one of the causes of eutrophication of lakes and marshes. The detergent industry has been developing phosphate-free detergents. At present, aluminosilicate (zeolite) having a specific structure is used as a main component of a sequestering agent.

However, water-insoluble aluminosilicates (zeolites) are generally used as dishwashing detergents.
Can not be used due to equipment limitations, so phosphate-type sequestering agents such as tripolyphosphate and pyrophosphate, or ethylenediaminetetraacetate (EDTA) or nitrilotriacetate (NTA) Currently, aminoacetate-type sequestering agents and the like are used.

[0007] In recent years, from the viewpoint of impact on the environment, research and development of sequestering agents that do not contain phosphorus, have good biodegradability, and have excellent sequestering ability have been actively conducted. In particular, research in this field has been advanced in the field of detergents for clothing. For example, Japanese Patent Application Laid-Open No. 5-170714 discloses a specific sequestering agent obtained by the reaction of epoxysuccinic acid or maleic acid with aspartic acid, and A detergent composition containing the same is disclosed, and it is described that this sequestering agent is excellent in biodegradability and detergency. JP-A-6-248300 discloses a detergent composition containing a specific amount of a sequestering agent comprising hydroxyiminodisuccinate. Glycine-N, N'-diacetate derivative has good biodegradability from BASF,
It has been announced that it has excellent sequestering ability (N
ew Horizon's 95 Conference Lake George, New York,
September 19-22, 1995). In addition, Monsanto (Monsant
o) CMT (carboxymethyle tartronatronate) developed by
) And ether carboxylate such as CMOS (carboxymethyloxysuccinate) developed by Lever Brothers Co. are also known to have good biodegradability and excellent sequestering ability. [Haruhiko Okuyama, Motoki Minagawa: Encyclopedia of Detergents and Cleaning, Asakura Shoten (1990), pp. 78-71]. Also, Nitto Chemical Co., Ltd. describes that aminocarboxylic acids such as aspartic acid diacetate have good biodegradability, excellent sequestering ability, and can be used as a builder for detergents (JP-A-7-89913). No.)

[0008]

Although it is desirable to incorporate a builder excellent in biodegradability also in a dishwashing detergent composition, the above-mentioned sequestering agent is a builder technology relating to a detergent for clothing, The effects of dishwashing detergent compositions with different forms and types of soiling are not yet known. For example, in addition to having good detergency, an effect peculiar to a dishwashing detergent that does not generate spots called water spots on the surface of a dried dish after washing is required. The current automatic dishwashing detergent does not always have satisfactory washing performance from the viewpoint of washing, and further improvement in washing power is required.

[0009]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to achieve the above object, and as a result, glycine-N, N'-diacetate has been added to hydroxides of alkali metals as sequestering agents. It has been found that the use of the derivative in combination further improves the detergency of stains remaining on tableware, and the present invention has been completed.

That is, the present invention provides: (a) 1 to 60% by weight of an alkali metal hydroxide; (b) 1 to 50% by weight of a glycine-N, N'-diacetate derivative represented by the following general formula (I):

[0011]

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(Wherein M represents H or Na, K, or NH ₄ , and R represents an alkyl or alkenyl group having 1 to 18 carbon atoms) as an essential component. The present invention provides a mechanical cleaning composition. The detergent for an automatic dishwasher of the present invention exhibits excellent detergency even when used in the form of a liquid detergent, powder or solid detergent. Hereinafter, the cleaning composition for an automatic dishwasher of the present invention will be described in detail.

As the alkali metal hydroxide (a) used in the present invention, sodium hydroxide and potassium hydroxide are preferred. When the detergent for an automatic dishwasher of the present invention is used as a powder or a solid detergent, hydroxides of these alkali metals can be used in the form of powder, granules, flakes and pellets. The alkali metal hydroxide is incorporated in the composition of the present invention in an amount of 1 to 60% by weight, preferably 5 to 50% by weight. When the amount of the alkali metal hydroxide is less than 1% by weight, the alkali ability is insufficient, and the expected detergency cannot be exhibited. Also, 60% by weight
If it is larger, the cleaning effect is saturated and is not economical.

Next, (b) the above general formula used in the present invention
The glycine-N, N'-diacetate derivative represented by (I) is a sequestering agent excellent in biodegradability, and 1 to 50% by weight, preferably 2% by weight, in the detergent composition of the present invention. 4545% by weight. If the amount is less than 1% by weight, the cleaning performance is reduced. If the amount is more than 50% by weight, the cleaning performance is saturated.
Higher formulations are not economical. M in general formula (I)
The (counter ion) is generally hydrogen, sodium, potassium, or ammonium. The partially neutralized one has the highest sequestering ability of metal ions and the highest effect of improving detergency, but the completely neutralized one also shows a sufficient effect of improving detergency. The glycine-N, N'-diacetate derivative represented by the general formula (I) is excellent in biodegradability, and by adding such a compound, the detergency is improved, and the dish surface after washing is also improved. The occurrence of a water spot can be prevented.

The detergent for an automatic dishwasher of the present invention may further contain (c) a water-soluble carbonate or silicate as an alkali agent or an extender in an amount of 1 to 90% by weight. Examples of such carbonates or silicates include sodium carbonate, potassium carbonate, ammonium carbonate, sodium orthosilicate, sodium metasilicate, first sodium silicate, second sodium silicate, and third sodium silicate. The content of these carbonates or silicates in the dishwasher detergent is preferably 1 to 30% by weight for liquid detergents, and 5 to 90% by weight for powdery or solid detergents.

Further, the detergent for an automatic dishwasher of the present invention further comprises (d) an anionic water-soluble polymer such as polyacrylate, acrylic acid-maleic acid copolymer, carboxymethyl cellulose or the like. It is preferably used as a chelating agent. These anionic water-soluble polymers are incorporated in the detergent composition of the present invention in an amount of 0.5 to 10% by weight.

In addition to the components (a) to (d), the detergent for an automatic dishwasher according to the present invention includes a conventionally known tripolyphosphate, pyrophosphate, hexametaphosphate, carbonate, Inorganic builders such as percarbonate, silicate and sulfate, ethylenediaminetetraacetate, aminotrimethylenephosphonate, 1-hydroxy-1,1-diphosphonate, ethylenediaminetetramethylenephosphonate, diethylenetriaminepentamethylenephosphon Organic builders such as acid salts, citrates and gluconates, low-foaming nonionic surfactants, enzymes, chlorinated isocyanurates, and the like can also be appropriately blended.

[0018]

According to the present invention, a detergent for an automatic dishwasher with further improved detergency can be obtained by using a specific sequestering agent excellent in biodegradability in combination.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to examples, but the present invention is not limited to these examples.

Examples 1 to 14 and Comparative Examples 1 to 4 Detergent compositions shown in Tables 1 and 2 were prepared, and their detergency was evaluated by the improved method of the Leanuts test.・ Preparation of test pieces (1) Soil bath adjustment: 20 g of fat and oil, 0.25 g of monoolein, and oil red in which beef tallow and soybean oil were mixed at a volume ratio of 1: 1
0.1 g is dissolved in 60 ml of chloroform to prepare a dirty bath. (2) Preparation of model stain glass pieces: Model glass stain pieces are made using clean slide glass. The glass pieces are set as a set of six pieces, and the mass is measured up to 1 mg. 25 ± 1
Each slide glass is immersed in a dirt bath at a temperature of about 55 mm for 1 to 2 seconds until the dirt adheres, and then taken out.
The accumulation of dirt adhering to the lower part of the slide glass is sucked up using a cloth such as clean gauze or a filter paper, the adhesion of the dirt is made uniform, air-dried at 25 ± 1 ° C., and the mass is measured.
The model stained glass piece is used for the test within 1 hour or more and 2 hours or less. At this time, the amount of adhered stain per six model stained glass pieces should be 0.140 ± 0.010 g. Test operation (1) Washing: Put 6 sets of model stained glass pieces into 700 ml of a 0.15% aqueous solution of the detergent composition shown in Table 1 or 2 and use a Linatu improved washing tester at 60 ± 2 ° C. Wash for 1 minute. (2) Rinsing: After cleaning, 3.5 ° of glass stained on model
Rinse in 700 ml of DH hard water and rinse for 1 minute at 30 ± 1 ° C. using a Rinatsu improved washing tester. (3) Drying: The rinsed dirt glass pieces are air-dried all day and night, and then the detergency is measured. (4) Evaluation of detergency: Calculated from the weight of a model stained glass piece before and after cleaning. That is, the weight difference between before and after washing is determined, and the washing rate (%) is calculated by the following equation. Washing rate = (weight before washing-weight after washing) / Amount of stain x 10
0 The results are shown in Tables 1 and 2.

[0021]

[Table 1]

[0022]

[Table 2]

The symbols in the table indicate the following compounds (the same applies hereinafter). MGDA: Methylglycine-N, N'-diacetate 3Na salt EDTA: Ethylenediaminetetraacetic acid 4Na salt.

Examples 15 to 19 and Comparative Examples 5 and 6 Powdery detergent compositions shown in Table 3 were prepared and placed in a cartridge container for supplying detergent, and an automatic dishwasher DW- manufactured by Sanyo Electric Co., Ltd. was prepared. Installed at 230L. The cleaning composition was supplied from this supply machine, and the cleaning power was tested under the following conditions. Table 3 shows the results.・ Test conditions Washing temperature: 60 ± 2 ° C Washing time: 45 seconds Detergent concentration: 0.15% Rinsing time: 15 seconds Rinse temperature: 80 ± 2 ° C Washing object: Commercially dipped glass and air dried overnight Detergency was evaluated by visually judging residual water spots. The criteria are as follows. A: There is no water spot. ；: 1 to 5 water spots are observed. Δ: 6 to 19 water spots are observed. ×: 20 or more water spots were observed.

[0025]

[Table 3]

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[Procedure amendment]

[Submission date] November 21, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0022

[Correction method] Change

[Correction contents]

[0022]

[Table 2]

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Noboru Matsuo 1334 Minato, Wakayama City, Wakayama Prefecture Kao Corporation Research Center

Claims (3)

[Claims] (1) 1 to 60% by weight of an alkali metal hydroxide (b) 1 to 50% by weight of a glycine-N, N'-diacetate derivative represented by the following general formula (I): ] (Wherein M represents H or Na, K, or NH ₄ , and R represents an alkyl or alkenyl group having 1 to 18 carbon atoms) as an essential component. Composition. 2. The method according to claim 1, further comprising (c) a water-soluble carbonate or silicate.
The detergent composition for a dishwasher according to claim 1, wherein the composition comprises about 10% by weight. 3. The method according to claim 2, further comprising:
The detergent composition for a dishwasher according to claim 1, comprising 10% by weight.