EP1149143A1

EP1149143A1 - Agent for cleaning hard surfaces

Info

Publication number: EP1149143A1
Application number: EP99907471A
Authority: EP
Inventors: Karl-Heinz Rogmann; Birgit Skodell; Heiko Faubel
Original assignee: Ecolab GmbH and Co OHG; Henkel Ecolab GmbH and Co KG
Current assignee: Ecolab GmbH and Co OHG
Priority date: 1999-02-02
Filing date: 1999-02-02
Publication date: 2001-10-31
Anticipated expiration: 2019-02-02
Also published as: EP1149143B1; DK1149143T3; WO2000046327A1; DE59902606D1

Abstract

The invention relates to an aqueous agent which is provided for cleaning hard surfaces and which comprises a pH value of greater than 7. The inventive agent comprises: A) 5 to 45 wt. % of at least one polymer compound which is soluble in the alkaline medium, which is not cross-linked by metal ions, and which has a temperature of film formation ranging from 0 and 80 °C; and B) 2 to 90 wt. % of a surfactant combination comprised of a alkoxylated linear C8-C18 fatty alcohol with 1 to 10 ethylene oxide groups and 1 to 5 propylene oxide groups per molecule, whereby the free OH group can be closed by a C1-C4 alkyl group, and is comprised of at least one additional surfactant selected from the group comprised of alkoxylated branched-chain C8-C18 alcohols with 1 to 8 ethylene oxide units in the molecule, whereby the free OH groups can be closed by a C1-C4 alkyl group, C8-C18 fatty alcohol ethoxylates with 1 to 12 ethylene oxide units in the molecule and hydroxy mixed ethers corresponding to the following formula (I): R1O[CH2CH(CH3)O]x(CH2CHR2O)y[CH2CH(OH)]zR3 wherein R1 represents a linear, aliphatic hydrocarbon radical with an average of 4 to 18 hydrocarbon atoms in the molecule including the mixtures thereof, R2 represents a hydrogen atom or an alkyl group with 1 to 6 hydrocarbon atoms, and R3 represents a linear, aliphatic hydrocarbon radical with an average of 2 to 14 hydrocarbon atoms in the molecule including the mixtures thereof, x equals 0 or 1 to 5, y equals 1 to 30, and z equals 1 to 3.

Description

"Means for cleaning hard surfaces"

The present invention relates to an aqueous agent for cleaning hard surfaces, which contains a combination of polymer compounds soluble in alkaline medium and nonionic surfactants, and to the use of these agents for the mechanical cleaning of floors.

In the field of cleaning hard surfaces, in addition to the hygienic and aesthetic aspects, the materials of the surfaces to be cleaned as well as the type and intensity of the contamination and economic factors must be taken into account. The hard surfaces include, for example, natural stone coverings, tiles such as porcelain stoneware, but also elastic coverings such as linoleum and PVC. When cleaning hard surfaces in the commercial sector, it must also be taken into account that the surfaces have different structures and, at the same time, soiling of the most varied types has to be removed, possibly with simultaneous disinfection, depending on the application. For this reason, a large number of funds have been developed for this area.

In practice, the selection of the agents is essentially determined by whether the agents perform the cleaning task on the most varied of materials in the shortest possible time, regardless of the type of contamination. For economic reasons, machines are used for this in commercial cleaning. Floor cleaning generally uses scrubber driers (automatic cleaning machines) or scrubbing machines (single-disc or counter-rotating multi-disc machines or brush rolling machines). In the latter case, the cleaning agents are suctioned off in a second operation using a water suction device.

When cleaning floors with rough surfaces, such as stoneware or stoneware slabs as well as non-polished natural and artificial stones, there is the problem that dirt accumulates very quickly on these floors due to the large surface area. If only cleaning agents are used, the surfaces will become very dirty after a very short time. In order to delay the deposition of renewed soiling, cleaning is usually carried out in two steps, namely cleaning as such and subsequent preservation of the surface of the covering. Products that contain both cleaning and care products do not show sufficient cleaning performance, so that dirt builds up continuously.

Mixed products are known in the trade which show better cleaning performance, but these products foam so strongly that they are not suitable for machine use. In addition, the wiping agents often contain care components that form a strong care film, so that despite strong suction during machine cleaning, the surefootedness of porcelain stoneware tiles can be impaired. Further attempts to develop cleaning-reinforced combined products often lead to problems in machine use due to the unfavorable foaming behavior. In addition, a higher proportion of surfactant leads to sticky residues on the floors, which in turn result in more intensive soiling of the floor.

On the other hand, the solubility of film-forming substances is only limited, so that they do not dissolve completely and cannot be removed again or only incompletely during the next cleaning, so that a strong care film can build up. This in turn affects the sure-footedness and the visual appearance of the floor and requires special cleaning at certain intervals.

The present invention was therefore based on the object of improving the conventional cleaning agents and thereby developing cleaning agents for hard surfaces, in particular for the commercial sector, which show good cleaning performance and at the same time preserve the surface, so that cleaning in one operation and preferably can be carried out with automatic cleaning machines.

The present invention relates to an aqueous agent for cleaning hard surfaces with a pH above 7, which contains A) 5 to 45% by weight of at least one polymer compound which is soluble in the alkaline medium and not crosslinked via metal ions and has a film-forming temperature between 0 and 80 ° C., and

B) 2 to 90% by weight of a surfactant combination of alkoxylated linear C ₈ -C ₁₈ fatty alcohol with 1 to 10 ethylene oxide and 1 to 5 propylene oxide groups per molecule, it being possible for the free OH group to be closed by a CrOpalkyl group, and at least one further surfactant from the group consisting of alkoxylated branched-chain C ₈ -C ₁₈ alcohols with 1 to 8 ethylene oxide units in the molecule, it being possible for the free OH groups to be closed with a C 1 -C ₁₈ -alkyl group, C ₈ -C ₁₈ fatty alcohol ethoxylates with 1 up to 12 ethylene oxide units in the molecule and hydroxy mixed ether with the following formula I.

R ¹ O [CH ₂ CH (CH ₃ ) O] _x (CH ₂ CHR ² O) _y [CH ₂ CH (OH)] _z R ³ (I)

wherein R ^{1 is} a linear, aliphatic hydrocarbon radical with an average of 4 to 18 carbon atoms in the molecule including their mixtures, R ^{2 is} a hydrogen atom or an alkyl group with 1 to 6 carbon atoms and

R ^{3 represents} a linear, aliphatic hydrocarbon radical with an average of 2 to 14 carbon atoms in the molecule, including their mixtures, y represents 1 to 30 and z represents 1 to 3

It has proven to be particularly advantageous if components A and B are present in a ratio of 1 1 to 10 1, preferably 5 1 to 1 1

The agents according to the invention are preferably used in dilution with water, the application concentration usually being between 0.5 and 5% by weight, preferably between 2 and 5% by weight, based on the application solution. The application can be carried out manually or in conventional cleaning machines, for example by applying the cleaning solution and then mechanical scrubbing with scrubber driers or other scrubbing machines. The loosened dirt is well dispersed in the cleaner liquor so that it does not redeposit into the pores of the floor material before the liquor is suctioned off. After the scrubbing and suction process, the floor is not rinsed, the remaining moisture dries. A wafer-thin care film forms on the surface, which prevents or reduces dirt from adhering. This care film is completely dissolved again during the next cleaning process and forms again from the remaining moisture

The cleaning agent according to the invention is also characterized in particular by the fact that the surfactant combination removes a broad spectrum of oily and pigment-containing soiling.The cleaning performance is close to that of anionic cleaning agents which are particularly active in cleaning, but has the advantage that no excessive amounts of foam are formed when they are used impair the continuous operation of the cleaning machines.

When the cleaning agent according to the invention is used for cleaning surfaces, there is no build-up of the care film, since this is completely dissolved again when cleaned again. The low film thickness and the nature of the film also ensure that the tiles are sure-footed.

Suitable polymers according to the invention are generally all polymer compounds which are soluble in water in the alkaline range, provided that they are not metal-crosslinked. The film-forming temperature is preferably between 0 and 80 ° C. These are preferably (meth) acrylic acid (ester) copolymers. Solubility is generally achieved by carboxylic acid groups. Preferred polymers contain a (meth) acrylate copolymer of 1 to 30 parts by weight, based on the copolymer, carboxylic acid-containing monomers, 30 to 70 parts by weight, based on the copolymer, monomers, the homopolymers with gas transition temperatures form below 20 ° C, preferably d-Ce alkyl esters of acrylic acid and / or the C -C ₈ alkyl esters of methacrylic acid, and 30 to 70 parts by weight, based on the copolymer, of comonomers which form homopolymers with glass transition temperatures above room temperature, preferably C. ^ Cs-A ^ ylester of (meth) acrylic acid or styrene. Particularly suitable comonomers containing carboxylic acid groups are ethylenically unsaturated carboxylic acids, acrylic acid and methacrylic acid being preferred.

As comonomers with glass transition temperatures below 20 ° C, that is glass transition temperatures below room temperature (based in each case on the homopolymers of the monomers), -C-C ₃ -alkyl esters of (meth) acrylic acid are suitable, such as methyl methacrylate or ethyl methacrylate. A particularly preferred comonomer whose homopolymer has a glass transition temperature above room temperature is styrene.

Copolymers used with preference are those of acrylic acid and / or (meth) acrylic acid with styrene, acrylic acid esters and / or methacrylic acid esters. The copolymers of (meth) acrylic acid with (meth) acrylic acid esters and / or styrene, e.g. for example copolymers of methyl acrylate, ethyl acrylate, methacrylic acid and styrene.

The monomers are present in the copolymers in such proportions that the film-forming temperature of the finished copolymer dispersion is between 0 and 80.degree. The person skilled in the art is familiar with setting the quantitative ratios of comonomers in order to maintain this film-forming temperature. The film formation temperatures mentioned relate to plasticizer-free systems, i.e. on copolymers without further additives.

Polymers are preferably used which are water-soluble only in the alkaline range, while they are insoluble in the acidic range. Such products are commercially available and are offered in emulsified form.

In the composition according to the invention, the polymers of component A are present in an amount of 5 to 45% by weight, preferably 5 to 30% by weight and in particular 8 to 20% by weight, based on the finished composition and calculated as a pure polymer , contain.

The surfactants contained as component B are commercially available products which are present in an amount of 2 to 90% by weight, preferably 5 to 65% by weight, and in particular 5 to 35% by weight, based on the finished composition. The pH of the agents according to the invention is preferably between 8 and 10 in order to ensure the solubility of the polymer compounds of component A. Alkalizing agents which can be used are both volatile and solid alkalis, such as NaOH and KOH, alkali carbonates, ammonia, waterglass and / or amines, such as alkylamines and alkanolamines, ammonia or alkanolamines preferably being used. When considering the amount of the alkalizing agent, it should be taken into account that when using commercially available polymer emulsions as component A, these may already contain small amounts of alkalizing agents.

The agents according to the invention can contain anionic surfactants and other nonionic surfactants other than component B as cosurfactants, alkalizing agents, alkaline reacting complexing agents, water-miscible organic solvents, cleaning-active salts, solubilizing agents and other customary additives as further ingredients.

Alkylbenzenesulfonates, C ₈ -C ₂₂ alkyl sulfates, C ₈ -C ₂₂ -Fettsäurestersulfonate, C ₈ -C ₂₂ - - Suitable anionic co-surfactants, in particular C ₈ -C ₂₂ alkanesulfonates, C ₈ -C ₂₂ fatty alcohol may, fatty acid soaps or mixtures thereof become. Anionic cosurfactants can be added in an amount of up to 3% by weight, preferably from 0.5 to 1% by weight, based on the finished composition.

Examples of nonionic cosurfactants which can be mentioned are the adducts of 13 to 40 mol of ethylene oxide with C ₈ -C ₂₂ alcohols or from 1 to 40 mol of ethylene oxide with C ₈ -C ₂₂ alkylphenols and the alkylpolyglycosides. The nonionic cosurfactants can be used in an amount of up to 8% by weight, in particular up to 6% by weight and particularly preferably up to 2% by weight, based on the finished composition.

The cleaning agents according to the invention can be present as so-called normal products, as concentrates and as pastes, it being known to the person skilled in the art that the transitions between these products are fluid. Normal products are usually liquid and represent solutions of their ingredients. The so-called concentrates are solutions or emulsions of the ingredients and have a liquid to viscous consistency. In normal products, surfactants can usually be used in an amount of up to 35% by weight, in concentrates up to 65% by weight and in pastes in an amount up to 90% by weight. The third possible embodiment is the pastes, which can be dosed using suitable devices. The pastes contain the active ingredients in an amount of up to 95% by weight. Pastes preferably do not contain additives and solvents.

As further optional constituents, the agents according to the invention can contain complexing agents which are able to compensate for impairments caused by extreme water hardness when the agents are used. Pentasodium triphosphate, trisodium citrate, sodium gluconate, tetrasodium methylenediamine tetraacetate (EDTA-Na), products based on polyaspartic acid and trisodium nitriloria acetate (NTA-Na) are particularly suitable. NTA-Na and / or sodium gluconate are preferably used. The complexing agents can be used in an amount of up to 8% by weight, preferably 0.5 to 5% by weight, based on the finished agent. If the agent contains phosphates, the amount of complexing agents can be lower.

To increase the cleaning power, water-miscible organic solvents may be present, with liposoluble solvents being preferred. Examples of suitable solvents are mono- and dialcohols, ether alcohols and polyethers.

Typical representatives can be mentioned isopropanol, butyl glycol, ethylene glycol monophenyl ether, dimethyl diglycol and methyl pyrrolidone. Lower ether alcohols, for example mono- or diethylene monoalkyl ethers having 1 to 4 carbon atoms in the alkyl group, are preferably used. The solvent content is not more than 30% by weight, preferably not more than 20% by weight and in particular between 0.5 and 10% by weight, based on the finished composition.

In addition to the compounds mentioned as alkalizing agents, the performance of the agents according to the invention can be increased by adding further alkaline salts, such as. B. polyphosphates and pyrophosphates, especially sodium tripolyphosphate or tetrapotassium pyrophosphate. These salts are preferably used in an amount of 2 to 8% by weight, but at most 15% by weight, based on the finished agent. To stabilize the individual components in the cleaning agents according to the invention, these solubilizers, such as. B. cumene sulfonate, octyl sulfate, toluenesulfonate, xyloisulfonate or urea. The solubilizers can be contained in the agent according to the invention in amounts of up to 10% by weight, in particular 1 to 6% by weight, in each case based on the finished agent. Fatty acid soaps also have solubilizing properties. If the cleaning agent contains soap, the amount of solubilizer can usually be very small.

The agents according to the invention may also contain inorganic neutral salts, colorants and fragrances, thickeners and corrosion inhibitors and, if appropriate, disinfectants as further optional constituents. The amount of the additives is preferably not more than 5% by weight, preferably not more than 2% by weight and in particular from 0.05 to 1% by weight, based on the finished composition. Further auxiliaries customary in cleaning agents for commercial purposes can also be included, provided they do not impair the effect according to the invention.

In one possible embodiment of the present invention, the composition contains 5 to 30% by weight of a polymer of component A, 2 to 45% by weight of surfactants of component B, up to 6% by weight of further nonionic surfactants, up to 2% by weight % anionic surfactants, up to 30% by weight of alkalizing agent, up to 5% by weight of alkaline complexing agents, up to 30% by weight of water-miscible organic solvents and up to 8% by weight of further additives, such as Solubilizers, thickeners, dyes and fragrances.

The present invention further relates to the use of the agents described above for cleaning hard surfaces, in particular floors with a rough surface, preferably for machine cleaning floors.

Yet another object of the present invention relates to a method for the mechanical cleaning of hard surfaces, in which the surfaces are processed in a manner known per se using cleaning machines using an aqueous cleaning agent with a pH value above 7, characterized in that the cleaning agent contains : A) 5 to 45% by weight of at least one polymer compound which is soluble in the alkaline medium and is not crosslinked via metal ions and has a film-forming temperature between 0 and 80 ° C., and

B) 2 to 90 wt .-% of a surfactant combination of alkoxylated linear C ₈ -C ₁₈ - fatty alcohol with 1 to 10 ethylene oxide and 1 to 5 propylene oxide groups per molecule, the free OH group being closed with a C 1 -C ₄ -alkyl group and at least one further surfactant from the group consisting of alkoxylated branched chain C ₈ -C ₁₈ alcohols with 1 to 8 ethylene oxide units in the molecule, it being possible for the free OH groups to be sealed with a dO _t alkyl group, C ₈ -C ₁₈ fatty alcohol ethoxylates with 1 to 12 ethylene oxide units in the molecule and hydroxy mixed ether with the following formula I.

R ^{3 is} a linear, aliphatic hydrocarbon radical with an average of 2 to 14 carbon atoms in the molecule including their mixtures, x is 0 or 1 to 5, y is 1 to 30 and z is 1 to 3.

Examples

Tables 1 and 2 show the compositions of six formulations according to the invention and six comparison formulations. The quantities of the individual components are percentages by weight and relate to the finished product and anhydrous raw materials.

The following water-soluble polymers were used:

Polymer 1 Syntran® 1503, polyacrylate dispersion from Interpolymer Corp. Massachusetts Polymer 2 Ubatol® U 3920, polyacrylate dipersion from Cray Valley, Tönisvorst Polymer 3 Primat® 644 polymer dispersion from Rohm and Haas, Philadelphia Polymer 4 copolymer from 58% by weight methyl methacrylate, 30% by weight ethyl acrylate, 10% by weight % Acrylic acid, 2% by weight styrene

Table 1

Composition of the agent according to the invention

The degrees of alkoxylation given represent average ranges or values. Table 2

Composition of the agents according to the prior art

The degrees of alkoxylation given represent average ranges or values. Testing the cleaning effect

The cleaning effect of the wiping care products was determined with the aid of a Gardner washability and abrasion test device, as described in the quality standards of the Industrial Association of Cleaning and Care Products (Seife-Öle-Fette-Wwachs, 108, pages 526-528 (1982) ). In this method, a white PVC film is coated with soot and grease and is wiped under a machine with a sponge soaked in the cleaning agent under standardized conditions. The cleaning performance is measured by photoelectric determination of the reflectance.

Checking the effects of care

The care effect is shown, among other things, by the fact that a film from previous treatments with the same agent facilitates the detachment of subsequently applied soiling.

The test method specified above was therefore modified in such a way that the film was wiped with the wiping agent to be tested before the application of the same soiling and then dried. After applying the soiling, the test was then carried out like the cleaning performance:

Table 3 shows the results of the tests on all 12 means. They are given in percent light emission based on white = 100%. In all tests, the agents were used in water-diluted form with a concentration of 2 percent by weight.

It is clear from the results that the wiping agents 1 to 6 according to the invention have an excellent cleaning performance both with respect to non-pretreated and to pretreated film. Soiling is removed even more effectively from pretreated film than from the original film. The agents R1-R3 / P1-P3 used for comparison, on the other hand, show good cleaning performance either only on untreated film (6) or only on pretreated film. The agents according to the invention are in their care effect quite comparable to the agents according to the invention, but unlike these, after multiple use leads to a film addition which adversely affects the natural appearance and the sure-footedness of the treated surfaces.

Re-contamination check

To determine the re-soiling, fields from 0.5 to 1 running meter of porcelain stoneware tiles were wiped three times with 5% product solution with a saturated 15x15 cm textile. The surface was not wiped off.

After drying, the fields were exposed to natural inspection. The arrangement of the test fields was changed daily. The test fields were evaluated by means of a test with a test field that was not used.

The test duration was 5 days with daily sampling and subsequent cleaning with 5% product solution. The evaluation was based on the following key.

0 = like original

- = worse results

Surefootedness measurement

The measurement was carried out using the Floor Slide Control FSC 2000, Sellmaier Elektronic Vertrieb GmbH, Walsertalstr. 4, 81476 Munich.

The sliding friction was measured. It was measured with a neutral lubricant (standardized filter paper).

The sliding friction values listed in Table 3 represent an average of 10 measurements.

The sliding friction value of 0.650 represents the original covering. The lower the sliding friction value, the more slippery the surface.

Testing the foam behavior

Foam number / foam decay Method:

50 ml of a 1% solution were placed in a 250 ml shaking cylinder, which was then sealed with a stopper. Within 20 seconds the cylinder was tipped 10 times by 180 ° and erected again. The amount of foam was read off immediately after the last tilting movement. The shaking cylinder was then left to stand still and the amount of foam was read off again after 60 seconds. 50 ml for the given solution were subtracted from the readings.

The second value in the table shows the foam disintegration, values above 70/70 ml indicate problems with too much foam, which in practice means that the scrubber drier stops due to the foam padding and the capacity of the device is not fully used can be.

Testing the dispersibility

The dispersibility was determined using a standardized test dirt using the shaking method.

Method:

200 ml of a 2% detergent solution was placed in a shaking cylinder, 0.2 g of dirt was added to it and the cylinder was closed. The cylinder was tilted through 180 ° 10 times within 20 seconds and erected again. The cylinder was then switched off and the dirt-bearing capacity was determined as a function of time.

Rating:

The assessment was made visually immediately and after 30, 60 and 120 seconds according to the following scheme:

1 = very good dispersibility, the dirt particles are evenly distributed in the solution. = good dispersibility, some of the dirt particles separate from the

Surface. = medium dispersibility, the majority of the particles separate on the

Surface, but a small part is in the solution. = poor dispersibility, all particles deposit on the surface.

Table 3

Technical characteristics

1 = the higher the value, the better the result, max. 100

2 = +/- rating 1-5

3 = critical limit 70/70 ml - values above 70/70 not suitable

4 = original sliding friction value 0.650 the lower the value, the slippery the floor

5 = the lower the number, the better the result

Claims

claims

1. Aqueous cleaner for cleaning hard surfaces with a pH above 7 that contains

A) 5 to 45% by weight of at least one polymer compound which is soluble in the alkaline medium and is not crosslinked via metal ions and has a film-forming temperature between 0 and 80 ° C,

B) 2 to 90 wt .-% of a surfactant combination of alkoxylated linear C ₈ -C ₁₈ fatty alcohol with 1 to 10 ethylene oxide and 1 to 5 propylene oxide groups per molecule, the free OH group being closed by a C ₁ -C alkyl group and at least one other surfactant from the group consisting of alkoxylated branched chain C ₈ -C ₁₈ alcohols with 1 to 8 ethylene oxide units in the molecule, it being possible for the free OH groups to be closed with a C 1 -C ₄ alkyl group, C ₈ -C ₁₈ - fatty alcohol ethoxylates with 1 to 12 ethylene oxide units in the molecule and hydroxy mixed ether with the following formula I

wherein R ^{1 is} a linear, aliphatic hydrocarbon radical with an average of 4 to 18 carbon atoms in the molecule, including their mixtures,

R ^{2 is} a hydrogen atom or an alkyl group having 1 to 6 carbon atoms and

2. Composition according to claim 1, characterized in that components A and B are present in a ratio of 1: 1 to 10: 1, preferably from 5: 1 to 1: 1.

3. Composition according to claim 1 or 2, characterized in that contain as copolymers soluble in alkaline polymeric copolymers of (meth) acrylic acid with (meth) acrylic acid esters and / or styrene, preferably copolymers of methyl acrylate, ethyl acrylate, methacrylic acid and styrene are.

4. Composition according to one of claims 1 to 3, characterized in that the pH with an alkalizing agent selected from the group consisting of NaOH, KOH, ammonia, water glass, alkali carbonates and / or amines, preferably to values between 8 and 10, is set.

5. Composition according to one of claims 1 to 4, characterized in that anionic and nonionic cosurfactants, alkalizing agents, alkaline complexing agents, water-miscible organic solvents, cleaning salts, solubilizing agents and other conventional additives are included.

6. Composition according to one of claims 1 to 5, characterized in that anionic cosurfactants from the group C ₈ -C ₂₂ alkanesulfonates, C ₈ -C ₂₂ - alkylbenzenesulfonates, C ₈ -C ₂₂ alkyl sulfates, C ₈ -C ₂₂ - Fatty acid ester sulfonates, C ₈ -C ₂₂ fatty alcohol ether sulfates, fatty acid soaps and mixtures thereof are contained.

7. Composition according to one of claims 1 to 6, characterized in that nonionic cosurfactants from the group of adducts of 13 to 40 moles of ethylene oxide with C ₈ -C ₂₂ alcohols, adducts of 1 to 40 moles of ethylene oxide with C ₈ -C ₂₂ - Alkylphenols, alkylpolyglycosides and mixtures thereof are included.

8. Use of the cleaning agent according to one of claims 1 to 7, after dilution for cleaning hard surfaces, in particular floors with a rough surface.

9. Use according to claim 8 for the mechanical cleaning of floors.

0. Process for the mechanical cleaning of hard surfaces, in which the surfaces are processed in a manner known per se using cleaning machines using an aqueous cleaning solution, characterized in that the cleaning solution is prepared using an aqueous cleaning agent which contains the following constituents:

A) 5 to 45% by weight of at least one polymer compound which is soluble in the alkaline medium and is not crosslinked via metal ions and has a film-forming temperature between 0 and 80 ° C., and

B) 2 to 90 wt .-% of a surfactant combination of alkoxylated linear C ₈ -C ₁₈ fatty alcohol with 1 to 10 ethylene oxide and 1 to 5 propylene oxide groups per molecule, the free OH group having a C ₁ -C ₄ alkyl group can be closed, and at least one further surfactant from the group consisting of alkoxylated branched chain C ₈ -C ₁₈ alcohols with 1 to 8 ethylene oxide units in the molecule, it being possible for the free OH groups to be closed with a C _t ^ alkyl group, C ₈ -Cι ₈ - fatty alcohol ethoxylates with 1 to 12 ethylene oxide units in the molecule and hydroxy mixed ether with the following formula I.

R ^{2 is} a hydrogen atom or an alkyl group having 1 to 6 carbon atoms and