JPH0841488A - Composition and method for deterging - Google Patents

Abstract

PURPOSE: To obtain a cleaning composition having a limited maximum pH and a relatively high alkali preparation and being suitable for domestic use, especially, a cleaning composition for removing baked-on soil from cooking containers and utensils and the surfaces of cooking places or other surfaces.

CONSTITUTION: There is provided a package containing a cleaning composition for pretreatment of baked-on soil, which composition contains (a) 2-50 wt.% surfactant selected among anionic, cationic, amphoteric, zwitterionic, and nonionic surfactants and mixture thereof, and (b) 0.01-5.00 wt.% metal- complexing agent, wherein the pH of the net composition is below 13.0, and the pH at an aqueous dilution of 1% is greater than 10, and the package comprises a means to produce a spray of the composition.

COPYRIGHT: (C)1996,JPO

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to cleaning compositions and, more particularly, to cleaning compositions for removing scorched soil from cooking vessels and other utensils and kitchens and other surfaces.

The present invention further relates to a method of cleaning such appliances and surfaces by treating them with the composition of the present invention.

[0003]

A well-known problem in the field of dishwashing is the removal of "stick". Such charring is formed by heating a composition containing one or more of protein, fat and carbohydrate,
It is formed by a series of reactions generally considered to produce a complex mixture of cross-linked products, carbon residues, colloidal sugar-like molecules and acrolein.

US Pat. No. 4065113 (Proct)
er & Gamble, 1976) disclose that charring can be removed by using a composition containing an anionic synthetic detergent and a phosphate builder, optionally in the presence of a free organic base. At least part of is derived from monoethanolamine.

British Patent No. 2224286 (Unile
Ver., 1989), certain alkaline cleaning compositions are known to be effective when used to "pre-treat" soiled pots, pans, plates and other dishes. There is. These cleaning compositions are applied to soiled dishes or the like and left on the dishes or the like for 5 minutes to about 1 hour. After this "pretreatment", the dishes can be removed by lightly washing the dishes and the like by a conventional dishwashing operation by hand or machine. It is known that such compositions are capable of removing burnt, dry or chilled food.

The pretreatment composition disclosed in GB 2224286 contains from 1 to 10% by weight of organic base. The base provides the source of alkalinity for the product and generally comprises monoethanolamine, n-butylamine, pyrrolidine or another nitrogen species. The compositions disclosed in that patent further include EDTA, NTA, citrate and aminophosphonates (eg Dequest 2000 and 2066).
It contains 0.1 to 10% of a zinc complexing agent selected from
Conventional surfactants are also incorporated into the compositions disclosed in British Patent No. 2224286.

Other compositions for removing charring are also known. U.S. Pat. No. 4,105,574 (Culmon
e) and 4372788 (Lancz) describe grills and oven cleaners based on monoethanolamine.

Despite the existence of products of the above composition,
There is a clear need for improvement in methods for removing charring. Although the use of strong acid and / or alkaline compositions can facilitate the removal of such soils, such compositions are irritating and corrosive, making them unsuitable for household use. is there.

The household composition must be environmentally acceptable and is preferably free of certain nitrogen-containing species. Further, the product should be physically stable enough, especially during temperature cycling between ambient and cold storage temperatures, so that it does not unnecessarily release the surfactant into the environment upon disposal by the user.

As mentioned above, pretreatment compositions are commonly used in processes which include at least two steps, a first step of treating a soiled article with the composition and a second step of cleaning the article in a conventional manner. ing.

The present inventors have found that when the composition containing another surfactant is used in the second stage, the material used in the first stage functions as the surfactant in these second stages. We have found that it is important not to interfere. In particular, it is important that the pretreatment composition does not change the foaming behavior of the second stage surfactant and should not cause excessive foaming or a reduction in detergency.

[0012]

SUMMARY OF THE INVENTION The inventors have improved if sufficient alkalinity is obtained, in part, from an alkaline reserve to maintain the pH of the composition at a significant dilution. It was discovered that it is possible to produce a hard surface cleaning composition. Suitably, these compositions are provided in a package suitable for delivering the composition in spray form to the surface of an article. Therefore, the composition can act in a concentrated form in the first stage of the washing operation. When the article is rinsed with water, the composition is diluted to form the solution used in the second stage of the washing operation.

Accordingly, a first aspect of the present invention is that a) at least 2% by weight of a surfactant selected from anionic, cationic, amphoteric, zwitterionic, nonionic surfactants and mixtures thereof, b) Metal complexing agent 0.01 to 5.0
Provided is a package comprising a cleaning composition for the pretreatment of charred soil containing 0% by weight, the pH of the pure composition being <13.
0, pH> 10 at 1% water dilution, the package comprises means for producing a spray of the composition.

According to another aspect of the invention, anionic,
A composition containing 2 to 50% by weight of a surfactant selected from cationic, amphoteric, zwitterionic, nonionic surfactants and mixtures thereof, and 0.01 to 5.00% by weight of a metal complexing agent. There is provided a method for cleaning scorched soil from a surface, comprising the step of treating the surface by spraying the surface with a pH of pure composition <13.0 and a pH> 10 at 1% water dilution. And spraying the composition in a substantially undiluted form to separate charring from the surface.

As mentioned above, the compositions of the invention are characterized by having a limited maximum pH and a relatively high alkaline reserve.

When applied as a neat liquid, the compositions of the present invention maintain a pH> 10 even after considerable dilution, such as by being absorbed by soil. On the other hand, the pure composition is not alkaline enough to be dangerously corrosive or overly irritating.

In use, the composition is applied to a tableware or the like which is soiled with a pure liquid or the surface thereof and left for a certain period of time. Ideally, this time should be 20 minutes or less, preferably less than 10 minutes. According to a preferred method aspect of the invention, no mechanical cleaning is required during the time period.

Subsequent washing operations may be carried out using conventional surfactant solutions known for hand or machine dishwashing, or may be carried out manually or in a dishwasher. However, it is preferable to use a solution obtained by diluting the pure composition of the present invention so that the total content of the surfactant is less than 2% by weight as the solution used in the latter-stage washing operation.

[0019] pH pH of the pure compositions of the present invention, it is important to not exceed 13.

Generally, the pH of the pure composition of the present invention is 11.
It is 0 to 12.9.

Certain alkali reserves are required to provide effective cleaning performance. As used herein, the alkali reserve measure is N per 100 g product when a 10% aqueous solution of the product is titrated from an initial pH to pH 10.
It is the number of grams of aOH.

Of course, the composition should be effective, but not corrosive or irritating to the user.

Although it is difficult to establish a strict limit as to what is considered dangerous corrosiveness or excessive irritation, one of the known criteria is to consider the sum of pH and part of the alkaline reserve. Is.

According to such a scale, the product is considered "corrosive" when the sum of pH and 1/12 of the alkaline reserve is> 14.5. According to the same scale,
The product is considered irritating when the sum of pH and 1/6 of the alkaline reserve is> 13.0. The preferred products of the present invention are, by this scale, non-irritating and non-corrosive, i.e., have a pH of 10.0 to 13.00 and the alkaline reserve is small enough to satisfy the above two conditions.

Another criterion is to take into account the compositional concentrations of materials that were considered irritating and corrosive. One such measure considers 1/20 of the percentage of "irritating" ingredients present, plus twice the percentage of "corrosive" ingredients present, to be <1. The preferred compositions of the present invention are non-irritating and non-corrosive by this criterion.

Preferred compositions have a pure pH of 11-12 and a pH of 10-11 at 1% water dilution.

The composition of the present invention generally contains an inorganic base.

We have found that excellent results are obtained when the composition contains an alkali metal carbonate, optimally sodium carbonate and optionally an alkali metal hydroxide, preferably sodium hydroxide. I found out. The preferred concentration of carbonate is 2-8% by weight. The preferred concentration of hydroxide is 0.1
~ 2% by weight.

The composition of the present invention generally comprises a polycarboxylic acid,
It preferably contains a di- or tricarboxylic acid. Tricarboxylic acids, especially citric acid, are preferred. A typical composition of the present invention contains 2-10% by weight citric acid or a salt thereof.

Surfactants Surfactants are an essential component of the compositions of the present invention. Although a single surfactant species may be used, it is more common to use a mixture of surfactant species of the same general type or different types.

Suitable surfactants contain one or more of the following surfactants:

(A) General formula: R ₁ . R ₂ . CH-SO ₃ X
(In the formula, R ₁ and R ₂ are the same or different and each is a linear or branched alkyl group containing at least one carbon atom, the alkyl chain length is 13 to 18, and X is a solubilizing cation. second alkane sulfonates containing a mixture of materials in which), (b) formula: RO-SO ₃ X (wherein, R C
_{8-18 is a} primary alkyl group and X is a solubilizing cation) and is derived from an alkylbenzene having a mixture of materials (c) a C ₈ -C ₁₆ primary or secondary alkyl group. An alkylbenzene sulphonate comprising a mixture of materials described, (d) the general formula: R- (O
_{CH 2 CH 2) n -OSO 3} X ( wherein, R is C ₁₀ -C ₁₈ alkyl, X is a solubilizing cation, n is the average degree of ethoxylation, material 1-5) An alkyl ether sulfate containing a mixture of (e) the general formula: R-
_{(OCH 2 CH 2) m -OH} ( wherein, R is a linear or branched C ₁₀ -C ₁₈ alkyl and the average degree of ethoxylation m is 1
14) ethoxylated alcohols.

Particularly suitable surfactants are anionic surfactants. The inventors have found that the compositions of the present invention containing significant amounts of nonionic surfactants are less effective than compositions without these surfactants.

The surfactant of choice is primary alcohol sulfate. These surfactants are considered environmentally preferred over other predetermined surfactant species.

In general, the use of excessively highly foaming surfactants and foam boosters (eg monoethanolamine) should be avoided, especially if the second washing step is carried out in a dishwasher. This way, you don't foam too much to overflow the dishwasher.

Generally, when the second washing step is carried out by hand washing, an antifoaming agent (eg terpine, mineral oil and silicone)
The use of should be avoided. In this way, the high foaming properties of the surfactants customary in hand-washing dishwashing compositions are not disturbed.

We use a primary alcohol sulfate as the bulk of the surfactant present and do not contain defoamers (eg mineral oils and silicones) or foam boosters (eg monoethanolamine). It has been found that the compositions of the invention meet these foam control criteria very well.

Metal Complexing Agent The composition of the present invention contains 0.01 to 5.00% by weight of a metal complexing agent.

Preferred metal complexing agents are dipicolinic acid, ethylenediaminetetraacetic acid (EDTA) and its salts, hydroxy-ethylidene diphosphonic acid (Dequest 201).
0, registered trademark), ethylenediaminetetra (methylenephosphonic acid) (Dequest 2040, registered trademark), diethylenetriaminepenta (methylenephosphonic acid) (D
request 2060/2066, registered trademark, aminotri (methylenephosphonic acid) (Dequest 20
00, registered trademark) and diethylenetriaminepentaacetic acid (“VERSENEX® 80”, registered trademark).

The metal-complexing agent of choice is aminophosphonic acid and its salts, which are commercially available under the name "Dequest", in particular diethylenetriaminepenta (methylenephosphonic acid).

A typical concentration of phosphorus-containing complexing agent is such that the composition contains 0.01 to 5.00% by weight metal aminophosphonate complexing agent. The phosphorus concentration of the composition of the present invention is preferably less than 1% of the product for environmental reasons.

Other metal complexing agents may also be included. Particularly, it is preferable to add citric acid or citrate. Citrate serves both as a component of the buffer system and as a metal complexing agent, and suitable concentrations of this component are discussed elsewhere herein.

Physical Stability The method of applying the product of the present invention is by spraying. In such coating methods, it is important that the composition does not phase separate during storage. In particular, the product is 5 ° C, more preferably 0 ° C.
It should not undergo irreversible physical changes during storage. In this regard, the careless disposal by the user of a product that does not exhibit the required stability may result in unnecessary release of surfactants or other components of the product into the environment, and thus phase stability Is considered important.

The inventors have determined that the selection of a particular type of surfactant improves the physical stability of the compositions of the invention during cold storage.

Preferably, the surfactant has the general formula: RO-
SO ₃ ^- X ⁺ (wherein, R C8～14, more preferably C
Primary alcohol sulphate (PAS) having an average chain length of 8 to C10).

We have found that compositions containing this surfactant are generally physically less at a lower temperature than compositions containing a longer average chain length primary alcohol sulfate and maintaining efficacy against charring. It was confirmed to be stable. The preferred primary alcohol sulfates are believed to have a low cloud point in the compositions of the present invention.

Minor ingredients Various non-essential ingredients may also be incorporated into the compositions of the present invention. Such ingredients include colorants, opacifiers, fragrances and solvents.

Preferred compositions of the invention include: a) the general formula: RO
-SO ₃ ^- X ⁺ (wherein, R has an average chain length of C8-C14) primary alcohol sulfate 2 to 15 wt% of
b) 0.01 to 5.00% by weight of aminophosphonic acid metal complexing agent, c) 2 to 8% by weight of alkali metal carbonate, d) 0.1 to 2% by weight of alkali metal hydroxide, and e) fragrance 0 .About.2% by weight, f) 0 to 2% by weight of preservative, and g) 1 to 10% by weight of polycarboxylic acid, and the pH of the pure composition is 1.
1.0-12.9, pH at 1% water dilution>
It is 10.

The compositions of the present invention are preferably substantially free of strong oxidants such as peroxygen compounds and hypohalites.

[0050]

The present invention will be further described below with reference to non-limiting examples.

The materials used are shown in Table 1 below.

[0052]

[Table 1]

Table 2 below shows examples of compositions of the present invention. Table 2
The tests and / or calculations therein have the following meanings.

"PH t.q." is the measured pH of a pure composition.

"PH 1% aq." Is the measured pH of a 1% aqueous solution of the composition.

"% S 20mins" is the% stain remaining after processing a test sample with a contact time of 20 minutes using the test method described below. According to a comparative example, a commercially available dishwashing solution for hand-washing (SVELTO: registered trademark) stains about 25.
%Remove.

"% S 5mins" is the% stain remaining after treatment of the test sample with a contact time of 5 minutes using the test method described below.

"Corrosion" is a value calculated as pH + 1/12 of alkali reserve, as described above. A product is considered corrosive if this number is> 14.5. Of the above materials, sodium hydroxide is considered corrosive.

"Irritation" is a value calculated as 1/12 of pH + alkaline reserve, as described above. A product is considered irritating if this number is> 13.0. Of the above ingredients, sodium carbonate and PAS are considered as irritating ingredients.

The "MICIP" rating is the sum of 1/20 of the percentage of "irritating" raw material present and twice the percentage of "corrosive" raw material present and should be <1.

"Low temperature stability" is a measure of the storage stability of the product at 5 and 0 ° C. The product is rated using the following scale. 1: stable at both 5 ° C and 0 ° C;
2: Stable at 5 ° C, but PAS crystallized slightly at 0 ° C.
Crystals were taken out after returning to room temperature; 3: Some crystals were taken out at both 5 ° C. and 0 ° C., and after returning to room temperature, crystals were taken out.

The stain removal test method was carried out as follows.
Stearic acid 5g, oleic acid 5g, "FRIOL"
A model soil was prepared from a mixture of 190 g.RTM. Oil, 200 g flour, 500 g cold deionized water and 1400 g boiling deionized water. The soil mixture was prepared by dissolving the fat in oil, suspending the flour in cold water, adding the resulting products and adding the remaining water. The mixture was boiled for 5 minutes, cooled and screened. By screen-printing a 9.5 × 9.5 cm patch on the surface of a 13 cm square enamel tile and heating the tile to 190 ° C. in the air for 1 hour to thermally decompose the stain,
A 1.2 g sample was deposited. 3 g of the test product was applied over the contaminated surface of the tile and the tile was left horizontal for a suitable time (5 or 20 minutes). After this time, 0.375
45 containing HDW solution diluted to an active ingredient concentration of g / l
The tile was immersed in water at 0 ° C for 2 minutes. The soiled surface was gently wiped with a damp sponge to remove detached soil and the results visually evaluated.

[0063]

[Table 2]

Footnotes to Table 2: * Examples 3, 4, 6 and 7 were repeated using PAS (2).

#PH was adjusted to a maximum of 12.85 by adding citric acid.

Numbers in parentheses are ratings of compositions using PAS (2).

As can be seen from the results in Table 2, the compositions of the present invention were all compared to conventional hand-washing dishwashing products and methods (removing about 25% scorching in the "% S 20 min" test above). Shows improved soil removal.

Also, the composition containing the nonionic surfactant performs poorer than the composition without this component (compare Examples 1 and 5).

All products which showed some visible phase instability at low temperature returned to room temperature when returned to room temperature, whereas short chain PAS
It will also be appreciated that the composition containing the surfactant has high low temperature storage stability (compare Examples 1 and 2, Example 3,
See 4, 6, and 7).

As can be seen from Table 2, all compositions have acceptable corrosive and irritant ratings and acceptable MICIP ratings. The highly irritating and corrosive products (see Examples 3 to 7) show improved performance over the less irritating and corrosive products (see Examples 1 and 2), but they are irritating and corrosive. Even the low product is significantly superior to the standard handwashing dishwashing composition used as a comparison.

It will also be appreciated that compositions containing colorants, fragrances and preservatives are sufficiently stable.

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Claims (10)

[Claims] 1. A) 2 to 50% by weight of a surfactant selected from anionic, cationic, amphoteric, zwitterionic, nonionic surfactants and mixtures thereof, and b) 0.01 metal complexing agent. A package comprising a cleaning composition for the pretreatment of non-sticky stains containing ~ 5.00% by weight, wherein the pH of the pure composition is <13.0 and pH> 1 at 1% water dilution.
0, the package comprising means for producing a spray of the composition. 2. The pH of the pure composition in the package is 11.
The package according to claim 1, which is 0 to 12.9. 3. The pH of the pure composition in the package is 11 to 10.
12 and the pH of the composition at 10% water dilution is 10-
11. The package according to claim 1, which is 11. 4. The pure composition in the package is 2 to 8% by weight.
The package of claim 1 containing the alkali metal carbonate of. 5. The package according to claim 1, wherein the pure composition in the package contains 0.1 to 2% by weight of alkali metal hydroxide. 6. The pure composition in the package has the general formula: RO.
—SO ₃ X (wherein R is a C _8-18 primary alkyl group,
X is a solubilizing cation). 7. The pure composition in the package has the general formula: RO.
-SO ₃ ^- X ⁺ (wherein, R has an average chain length of C8 to C10) package according to claim 6 containing a first alcohol sulphate (PAS). 8. The package of claim 1, wherein the neat composition in the package contains aminophosphonic acid. Pure compositions according to claim 9 in a package, a) the general ^{_{formula: RO-SO 3 - X +}} ( wherein, first alcohol sulfates of R has an average chain length of C8-C14) 2 to 15
% By weight, b) 0.01 aminophosphonic acid metal complexing agent
5.00% by weight, c) 2 to 8% by weight of alkali metal carbonate, d) 0.1 to 2% by weight of alkali metal hydroxide, e)
Perfume 0-2% by weight, f) preservative 0-2% by weight, and g)
Package according to claim 1 containing 1 to 10% by weight of polycarboxylic acid, the pH of the pure composition being 11.0 to 12.9 and having a pH> 10 at 1% water dilution. 10. 2 to 50% by weight of a surfactant selected from anionic, cationic, amphoteric, zwitterionic, nonionic surfactants and mixtures thereof, and a metal complexing agent 0.
A method of cleaning scorched soil from a surface, comprising the step of treating the surface by spraying the composition with 01-5.00% by weight, the pH of the pure composition being
<13.0, pH at 1% water dilution of the composition>
10. A method of spraying the composition in a substantially undiluted form.