Efficient cleaning system for rollers for adhesives

Abstract

The present invention is in the field of water-based adhesives, in particular non-mechanical aspects of adhesives in general, more in particular in the field of cleaning rollers, coating applicators, and the like, which are used in processes for applying adhesives, such as for adhering larger objects together. A remaining adhesive typically needs to be removed when rollers or the like are left to rest for longer periods of time, in order to prevent the adhesive from drying and forming a difficult to remove film or the like.

Description

[0001] EFFICIENT CLEANING SYSTEM FOR ROLLERS FOR ADHESIVES

[0002] FIELD OF THE INVENTION

[0003] The present invention is in the field of water-based adhesives, in particular non-mechan- ical aspects of adhesives in general, more in particular in the field of cleaning rollers, coating applicators, and the like, which are used in processes for applying adhesives, such as for ad- hering larger objects together. A remaining adhesive typically needs to be removed when roll- ers or the like are left to rest for longer periods of time, in order to prevent the adhesive from drying and forming a difficult to remove film or the like.

[0004] BACKGROUND OF THE INVENTION

[0005] The present invention is in the field of an adhesive, in particular an adhesive that can be applied by spraying, brushing, rolling or the like, more in particular in the field of cleaning of appliances used for rolling adhesives.

[0006] An adhesive is a material that attaches two parts together. This method is different to using mechanical methods of holding parts together. Adhesives have many advantages and disadvantages compared to mechanical methods of attaching parts. There are natural and syn- thetic made adhesives available. Most products are either applied in a liquid or paste form which increases in bond strength as it dries. They are used in different applications including manufacturing, construction and repair.

[0007] General properties of adhesives are open time, built-up time, set time, dry time, (ini- tial) tack, applicability and adhesion to a diverse range of substrate surfaces, contactibility, flexibility of an adhesive film, temperature stability, storage stability, viscosity, and surface energy. An adhesive is often an aqueous solvent with therein dispersed polymeric particles. A dispersion is considered to be a physicochemical system in which distributed particles of one material are dispersed in a continuous phase of another material. The two phases may be in the same or different states of matter. Dispersions can be classified in a number of different ways, including how large the particles are in relation to an otherwise (semi-) continuous phase, including the particle size distribution of the dispersed material, whether or not precipi- tation occurs, and the presence of Brownian motion.

[0008] Adhesives may be for use in spray applications, in rollers or roll systems. These adhe- sives can be used in layered products characterised by the relation between layers, such as products comprising layers having different or the same physical, chemical or physicochemi- cal properties, such as in foam bonding industry. Currently rollers and the like are cleaned by emptying the roller system and cleaning the residual film that is present on the roller by hand. This residual film is either removed in a wet state or allowed to dry and removed in a dried state. The choice is depending on the used adhesive / coating. In the wet state the adhe- sive / coating can be removed directly after the production process, the dried state is when the adhesive / coating is allowed to dry, usually overnight. In the wet state the adhesive is cleaned by wiping away the residual adhesive film using wipes / tissue / paper / cloth / fabric and tap or demi water to dilute the film. This process is time consuming and generates a lot of waste wa- ter containing remainders of the adhesive or coating.

[0009] In the dry state the adhesive is cleaned by pulling of the dried adhesive / coating film. This is only possible when the adhesive / coating film that is left on the roller generates enough cohesion force. These cohesion forces are needed for the formed dry film to withstand the pulling forces to remove the adhesive / coating of the roller. The adhesion of the dried film to metal should be low otherwise too much force is needed to remove the film from the roller. A solution is being offered by the Wakol company as Intercoll D 4560. However, a use thereof results in a coagulated adhesive product, which coagulated product still needs to be removed from the rollers by scraping. This scraping is typically done while the rollers are rotating, as otherwise only a part of the rollers can be cleaned, which is an undesired and hazardous oper- ation.

[0010] Incidentally reference can be made to US 3,790,488 A. This document recites a cleaning composition comprising an aqueous medium 10 having dispersed therein a 7:3 to 3:7 weight ratio mixture of a polar high molecular weight substance and a rubber, the concentration of said mixture being in the range of 10 to 609o' by weight, based on the weight of the composi- tion, and said rubber being at least one species selected from the group consisting of natural rubber, polybutadiene rubber and styrene- butadiene rubber.

[0011] There is therefore a need for improved cleaning of such rollers and the like. It is an ob- ject of the present invention to provide a solution which overcomes one or more of the above disadvantages, without jeopardizing functionality and advantages.

[0012] SUMMARY OF THE INVENTION

[0013] A purpose of the present invention is to provide a method of cleaning, in particu- lar of a two roll adhesive or coating applicator, and a composition for cleaning. The cleaning process may involve either two or three steps, for obtaining the desired result. The inventors have found a cleaning composition that is able to improve cleaning, which can be used in the following processes: To clean the adhesive in the dried state a two-step process is developed. A major gain is the reduced time to clean the equipment. In the present method excess adhe- sive may be removed from the rollers as much as possible initially. The present cleaning com- position, which may be considered to relate to a purpose limited, further chemical use, such as the low ammonia natural latex or LATZ comprising composition, is added to the roller, in particular to a surface thereof. It is noted that such compositions per se could be used as adhe- sive per se. Typically this composition is allowed to be mixed into the residual adhesive film for a set amount of application time, typically for 15 seconds-15 minutes. The roller is then set in an idle mode, and the residual mixture is allowed to dry for a set amount of drying time; in this drying process a strong film will be formed. The strong adhesive film is removed, such as by pulling this off by hand. For this the film typically has a high cohesion strength, with limited adhesive bonding to the surface of the roller, that is, the internal cohesive strength of an adhesive film is larger than an adhesive strength between the adhesive and the surface of the roller, in particular the metal thereof. This will allow the film to be pulled of cleanly from the roller leaving a roller without residues. To clean the adhesive in a wet state a three-step cleaning protocol is developed. Initially excess adhesive may be removed from the rollers as much as possible, such as by letting it run of from the rollers. The present cleaning composi- tion is now added to the roller. This is allowed to be mixed into the residual adhesive film for a set amount of time (30-720 seconds). Then a cleaner activator, such as a coagulant, typically a multivalent salt or an acid, is added. The present cleaning composition, for use in the re- moval of an aqueous adhesive or the like from surface to which it is applied, such as a surface from a roller, that is, for use in the removal of said adhesive, comprises 5-100 wt.% of an aqueous dispersion, preferably 10-50 wt.%, more preferably 15-45 wt.%, even more in partic- ular 20-30% wt.%, wherein the dispersion comprises a natural or synthetic rubber, in particu- lar wherein the aqueous dispersion comprises 5-100 wt.% of at least one natural or synthetic rubber dispersion, preferably 10-50 wt.% of at least one natural or synthetic rubber, more preferably 15-45 wt.% of at least one natural or synthetic rubber, even more in particular 20- 30% wt.% of at least one natural or synthetic rubber, in particular wherein the rubber is se- lected from at least one natural latex rubber, more in particular at least one low ammonia latex concentrate, from at least one of polychloroprene, styrene butadiene (SB-)rubber, acrylate rubber, and poly urethane (PU)-rubber, in particular from either a rubber-like dispersion or a polymeric-like dispersion, the natural or synthetic rubber dispersion comprising 30-80 wt.% solids, in particular 45-70 wt.% solids, more in particular 55-65 wt.% solids, 0.1 -7 wt.% of a thickener, 0.1 -5 wt.% of a surfactant, 0-60 wt.% of a cleaning activator, in particular 2-30 wt.%, wherein the composition is provided as such or in parts, that is, with separate cleaning activator and aqueous dispersion, and a remainder being water, wherein all weight percent- ages are based on a total weight of the cleaning composition, wherein the optional cleaner ac- tivator may, if compatible, be mixed prior to addition of the then combined cleaning composi- tion on the roller. The cleaner activator is allowed to mix into the mixture of residual film and cleaning composition. This will form a film that separates itself from the roller. After the film is removed from the roller water may be used to rinse the roller to remove residual cleaner ac- tivator. The rinse water is so diluted that it may be discarded of without further measures, de- pending on local law. So a difference with the two-step approach is the addition of an extra coagulant that causes the film to form immediately and not after drying, so this process has an extra step but is much faster. Of importance is the non-adhesion to the roller surface and the strength of the film. A major gain is less waste and a reduction of cleaning time. So, surpris- ingly, the residue on the rollers was removed from the roller without the need to scrub / or manually clean the rollers. Also a strong reduction in the amount of water necessary for the cleaning of the roller system was achieved. It is noted that all adhesives / coatings can be cleaned with this method, as well as all non-coagulating films can be cleaned with this method, by using the natural or synthetic rubber, in particular the low ammonia natural latex (LATZ).

[0014] The present invention to some extend relates to a cleaning composition based on sus- tainable raw material resources, which is in particular suited for the cleaning of metal surfaces by removing an aqueous dispersion thereof. A raw material considered for the cleaning com- position is natural rubber latex, preferably in the form of a low ammonia latex concentrate, commonly known as LATZ. That is, most or all of the cleaning composition comprises the at least one natural or synthetic rubber, in particular at least one natural latex rubber, more in particular at least one low ammonia latex concentrate, the natural or synthetic rubber disper- sion comprising 30-80 wt.% solids, in particular 45-70 wt.% solids, more in particular 55-65 wt.% solids, preferably comprising no surfactant, and wherein the dispersion has a pH of 6- 12, in particular 8.5-11.5, more in particular 9.5-10.5, further comprising 0-10 wt.% antifoam, further comprising 0-10 wt.% antioxidant, further comprising 0-1 wt.% biocide, further com- prising 0-20 wt.% viscosity modifier, and preferably no plasticizer and / or oil, and preferably 0.001-3 wt.% of a colorant or dye or pigment, or combination thereof in particular 0.005-1 wt.%, wherein all weight percentages are based on a total weight of the cleaning composition. The colorant or the like provides good visibility in terms of mixing properties, in particular if the LATZ is well mixed before adding a coagulant, such as the salt comprising a multivalent cation, an acid, and a combination thereof. Further, the following ingredients may also be added to the present cleaning composition, each individually in the (further) amounts men- tioned: Antifoam: 0,1-10 wt.%, preferably 0,2-5 wt.%, like 0,3 wt.%; Antioxidant: 0,1-10 wt.%, preferably 0,2-5 wt.%, like 0,7 wt.%; Biocide, such as fungicide or bactericide: 0-0,5 wt.%, preferably 0-0,1 wt.% such as 0,06 wt.%; In particular a viscosity modifier is consid- ered, to adjust the viscosity to a desired value: 0-20 wt.%, preferably 0.1-10 wt.%, like 0.2-5 wt.%.

[0015] In a second aspect the present invention relates to a method of cleaning a roller as de- scribed above, and likewise of a roller system, or a roll coater.

[0016] Advantages of the present description are detailed throughout the description. The teachings and examples of the present invention may be combined into a further not specifi- cally disclosed exemplary embodiment.

[0017] DETAILED DESCRIPTION OF THE INVENTION

[0018] In a first aspect the invention relates to a cleaning composition. Therewith in particular any adhesive / coating can be cleaned without the use of extra water due to formation of a strong non-binding film to metal. Surprisingly, it was found that, in ana exemplary embodi- ment, the dried film with the cleaning composition was easily removed from the rollers as the film did not adhere to the rollers without leaving a residue and without the use of additional water.

[0019] In an exemplary embodiment the present cleaning composition comprises 0.1-10 wt.%, antifoam, preferably 0.15-5 wt.%, like 0.2-0.3 wt.%.

[0020] In an exemplary embodiment the present cleaning composition comprises .1-10 wt.% antioxidant, preferably 0.2-5 wt.%, like 0.9-1.3 wt.%.

[0021] In an exemplary embodiment the present cleaning composition comprises 0.005-1 wt.% biocide, such as fungicide or bactericide, preferably 0.01-0.1 wt.% such as 0.02-0.03 wt.%, and / or 0.001-5 wt.% viscosity modifier, preferably 0.01-2 wt.%, like 00.02-0.05 wt.%. In an exemplary embodiment the present cleaning composition comprises 0.0-5 wt.% second surfactant, preferably 0.1-3 wt.%, such as 0.3-1.5 wt.%, and 0-40 wt.% filler, prefera- bly 0.1-10 wt.%, such as 0.2-5 wt.%.

[0022] In an exemplary embodiment of the present cleaning composition the cleaning activator is selected from a salt comprising a multivalent cation, from acids, from a coagulant, and from combinations thereof. The salt or cleaning activator may typically be present in an amount of 2-25 wt.%, in particular 4-18 wt.%, such as 10-15 wt.%. Typically, the cleaning activator is provided in a solvent, such as water, and in particular wherein the cleaning activator com- prises 75-99 wt.% solvent and 1-25 wt.% cleaning activator.

[0023] In an exemplary embodiment of the present cleaning composition the multivalent salt comprises a cation selected from di-valent metals, in particular from Ca2+, Mg2+, Cu2+, Zn2+, Ba2+, Fe2+, Fe3+, Al3+, and Mn2+, and / or wherein the acid is selected from weak acids, such as carboxylic acids, such as acetic acid, citric acid, lactic acid, formic acid, and oxalic acid, phthalic acid, from amino acids, and from hypo-oxy-acids, such as sulphurous acid.

[0024] In an exemplary embodiment the present cleaning composition comprises 0.5 -25 wt.% of a cleaning activator, in particular 1-20 wt.%, more in particular 5-15 wt.%, such as 8-12 wt.%,.

[0025] In an exemplary embodiment the present cleaning composition comprises 0.006 -0.5 wt.% of a colorant and / or pigment, in particular 0.006-0.3 wt.%.

[0026] In an exemplary embodiment the present cleaning composition comprises 0.1 -7 wt.% of a thickener, in particular 1-5 wt.%.

[0027] In an exemplary embodiment the present cleaning composition comprises 0.1 -5 wt.% of a surfactant, in particular 1-3 wt.%.

[0028] In an exemplary embodiment the present cleaning composition comprises 0.1 -10 wt.% of a further additive, in particular 1-6 wt.%.

[0029] In an exemplary embodiment of the present cleaning composition the remainder water is 10-90 wt.%, in particular 20-85 wt.%, more in particular 35-80 wt.%, even more in particular 45-70 wt.%, such as 55-65 wt.%.

[0030] In a second aspect the present invention relates to a method of cleaning a roller compris- mg providing the roller, the roller comprising an aqueous dispersion, providing a cleaning composition according to the invention, applying the cleaning composition to the roller for a drying period, wherein during the drying period the aqueous dispersion and the cleaning composition interact, such as by coagu- lation, and by forming a film of dried adhesive, and removing the dried adhesive from the roller.

[0031] In an exemplary embodiment of the present method the roller is selected from a roller as such, from a roller in a roller system, and from a roll coater, in particular wherein the roller comprises a metal surface, a polymeric surface, or a coated surface, to which an aqueous dis- persion can be applied. In an exemplary embodiment of the present method the drying period, in case of appli- cation of a cleaning composition without cleaning activator, is from 2-20 hours, in particular from 3-12 hours, and in case of a cleaning composition with cleaning activator, is from 120 seconds-75 minutes, in particular from 10 minutes-60 minutes, more in particular from 30 minutes-50 minutes. A coagulation period is typically from 5-240 seconds, in particular from 10-60 seconds, more in particular from 20-30 seconds.

[0032] In an exemplary embodiment of the present method the to be removed aqueous disper- sion is selected from dispersions, coatings, 1 -component adhesives, two component adhe- sives, a bio-based adhesive, and combinations thereof, such as a film forming adhesive, wherein the film has a thickness of 100 iim-lO mm, such as a polychloroprene comprising ad- hesive. The present method and cleaning composition are applicable to most aqueous disper- sions, if not all.

[0033] In an exemplary embodiment of the present method the dried adhesive is a film, and wherein the film is removed by hand, or wherein the film separates itself from the roller.

[0034] In an exemplary embodiment of the present method 0.001-1 ml cleaning composition per 1 cm2is provided, in particular 0.005-0.1 ml cleaning composition per 1 cm2, such as 0.01-0.05 ml / cm2.

[0035] In an exemplary embodiment the present method is performed without providing addi- tional water or additional aqueous composition, or wherein excess adhesive is first removed, in particular by applying water.

[0036] In an exemplary embodiment of the present method the roller comprises a metal surface for applying the aqueous dispersion.

[0037] The invention is further detailed by the accompanying figures and examples, which are exemplary and explanatory of nature and are not limiting the scope of the invention. To the person skilled in the art it may be clear that many variants, being obvious or not, may be con- ceivable falling within the scope of protection, defined by the present claims.

[0038] Examples

[0039] Cleaning Composition

[0040] 100% dispersion comprising:

[0041] 5-100% NR dispersion, for example LATZ , in particular 50% - 100%, in an alternative with activator with LATZ of about 30%. Likewise, in an alternative, a synthetic rubber disper- sion is used, such as polychloroprene, SB-rubber, acrylate-rubber, and Pu-rubber.

[0042] A solid content in the dispersions is typically 40-60% (PU e.g. 40%, polychloroprene 55% etc.)

[0043] 0-60% of a cleaning composition activator (optimum without activator being 0%, with activator -30%)

[0044] Compositions used:

[0045] Composition 1: 100% LATZ

[0046] Composition 2: 100% polychloroprene dispersion with 55% solid content

[0047] Composition 3: 100% PUD with 40% solid content Example 1 : Lapshear test with RVS 316 as model for the RVS of a roller system

[0048] Metallic samples made of RVS 316, having a surface of 1 cm x 20 cm were glued to- gether over a length of 1cm x 8 cm to form a lapshear test sample. The amount of glue (adhe- sive) or glue and cleaning composition used was approximately 8mg which corresponds with an amount of approximately 100g / m2.

[0049] The samples were allowed to dry for 4 days at room temperature.

[0050] The first sample consisted of a commercial adhesive used in foam bonding, Sababond

[0051] 3676, supplied by SABA Dinxperlo BV of the Netherlands. The second sample was 5% of the same adhesive, blended with 95% of a cleaning composition of this invention.

[0052] The following results were obtained:

[0053] Sample Fmax (N / mm2) Failure

[0054] Sababond 3676 0,0544 Cohesive failure

[0055] 95% cleaning composition 1

[0056] + 5% Sababond 3676 0,0030 Adhesive failure

[0057] 95% cleaning composition 2

[0058] + 5% Sababond 3676 0,0108 Adhesive failure

[0059] 95% cleaning composition 3

[0060] + 5% Sababond 3676 0,0029 Adhesive failure

[0061] It can be seen that the original adhesive has a much higher strength (Fmax) compared to the mixed samples. More importantly, the combined samples have an adhesive failure, i.e. they come cleanly of the RVS, while the original adhesive has a cohesive failure, in other words the adhesive is, after failure, still on the RVS. This shows that the mixed adhesive and cleaning compositions have no or hardly no adhering force left for the RVS of a roller system and the film can be removed without leaving adhesive stains on the roller.

[0062] Example 2: Strength of dumbbells (ISO 37)

[0063] Dumbbells were made by casting the Sababond 3676 and the Sababond 3676 with 95% cleaning agent of this invention and allowing them to dry for 14 days. After this period they were elongated to break using a tensile tester as described in ISO 37.

[0064] The following results were obtained:

[0065] Sample Fmax Standard Elongation Standard Elongation Standard

[0066] (N / mm2) deviation max (%) deviation at Fmax (%) deviation

[0067] Sababond 3676 0,324 0,035 1611,3 199,4 994,8 34,8

[0068] 95% cleaning composition 1

[0069] +5% Sababond 3676 8,65 2, 14 1298,9 173,2 1298,9 173,2

[0070] 95% cleaning composition 2

[0071] +5% Sababond 3676 6,01 0,34 483,2 15,4 480,8 16,1

[0072] 95% cleaning composition 3

[0073] +5% Sababond 3676 10,4 2,73 452,6 125,2 387,4 125,2

[0074] From these results of the maximal elongation and the elongation at Fmax it can be seen that the adhesive film from the mixture of Sababond 3676 and the cleaning composition is still very flexible. However from the Fmax value it can be seen that the film made from the mixture is much stronger than the film of the pure Sababond 3676.

[0075] Combining the results of Example 1 and Example 2:

[0076] By combining these results it can be understood that the mixture of this invention form a much stronger film which will no longer adhere to RVS. In other words: a film may be formed that can easily be removed from a roller system as it is a strong film which does not adhere to RVS with any strong residual force.

[0077] SUMMARY OF THE FIGURES

[0078] Figs. 1-22 show details of the present invention. Figs. 3-11 show a two-step process, and figs. 12-22 a three-step process.

[0079] DETAILED DESCRIPTION OF THE FIGURES

[0080] Fig. 1 shows a lab-scale roller, with two adjacent rollers indicated with arrows. On the rollers an adhesive is present.

[0081] Fig. 2 shows emptied rollers.

[0082] Fig. 3 shows rollers with an adhesive film.

[0083] Fig. 4 shows running off the adhesive film from the rollers in as far as possible.

[0084] Fig. 5 shows addition of the present cleaning composition to the rollers.

[0085] Fig. 6 shows mixing of the cleaning composition and adhesive after a period of time.

[0086] Fig. 7 the film formed by the cleaning composition and the adhesive, both on the rollers and in a container underneath the rollers. It shows the rollers with the excess of glue and cleaning agent run off.

[0087] Fig. 8 shows the smooth film formed.

[0088] Figs. 9 and 10 show the removal of the film formed.

[0089] Fig. 11 shows the result, a beautifully cleaned roller system.

[0090] Fig. 12 shows the adhesive on the rollers, in a first photo of the present three-step pro- cess.

[0091] Fig. 13 shows running off the adhesive film from the rollers in as far as possible.

[0092] Fig. 14 shows addition of the present cleaning composition to the rollers.

[0093] Figs. 15-16 show mixing of the cleaning composition and adhesive after a period of time.

[0094] Fig. 17 shows the mixed in cleaning composition in the adhesive on the roller.

[0095] Fig. 18 shows the addition of the cleaning activator to the mixed in cleaning composi- tion and adhesive of the present cleaning activator.

[0096] Fig. 19 shows the effect of the activator. Clearly different shadings can be observed, in- dicative of the action of the activation on the combined adhesive and present cleaning compo- sition.

[0097] Fig. 20 shows the removal of the film formed.

[0098] Fig. 21 shows the cleaned roller, now nice and shiny, ready for further use. Some wip- ing of with a wet tissue is performed.

[0099] Fig. 22 shows the final result. It should be appreciated that for commercial application it may be preferable to use one or more variations of the present system, which would similar be to the ones disclosed in the present application.

Claims

AMENDED CLAIMS received by the International Bureau on 24 June 2024 (24.06.2024)1. A cleaning composition for use in removal of an aqueous adhesive or aqueous coating from a roller comprising(i) 5-100 wt.% of an aqueous dispersion, preferably 10-50 wt.%, more preferably 15-45 wt.%, even more in particular 20-30% wt.%, wherein the dispersion comprises (ia) a natural or synthetic rubber, in particular wherein the aqueous dispersion comprises 5-100 wt.% of at least one natural or synthetic rubber, preferably 10-50 wt.% of at least one natural or synthetic rubber, more preferably 15-45 wt.% of at least one natural or synthetic rubber, even more in particular 20-30% wt.% of at least one natural or synthetic rubber, in particular wherein the rubber is selected from at least one natural latex rubber, more in particular at least one low ammonia latex concentrate, from at least one of polychloroprene, styrene butadiene (SB-)rubber, acrylate rubber, and poly urethane (PU)-rubber, the (ia) natural or synthetic rub- ber dispersion comprising (iai) 30-80 wt.% solids, in particular 45-70 wt.% solids, more in particular 55-65 wt.% solids,(ii) 0 -60 wt.% of a cleaning activator, in particular 0.1-30 wt.%,(iii) 0.1 -7 wt.% of a thickener, and(iv) a remainder being water, wherein all weight percentages are based on a total weight of the cleaning composition.

2. The cleaning composition according to claim 1, wherein the cleaning activator is selected from a salt comprising a multivalent cation, from acids, from a coagulant, and from combina- tions thereof, in particular wherein the cleaning activator is provided in a solvent, such as wa- ter, and in particular wherein the cleaning activator comprises 75-99 wt.% solvent and 1-25 wt.% cleaning activator.

3. The cleaning composition according to claim 2, wherein the multivalent salt comprises a cation selected from di-valent metals, in particular from Ca2+, Mg2+, Cu2+, Zn2+, Ba2+, Fe2+, Fe3+, Al3+, and Mn2+, and / or wherein the acid is selected from weak acids, such as carboxylic acids, such as acetic acid, citric acid, lactic acid, formic acid, and oxalic acid, phthalic acid, from amino acids, and from hypo-oxy-acids, such as sulphurous acid,.

4. The cleaning composition according to any of claims 1-3, comprising 0.1 -5 wt.% of a cleaning activator, in particular 1-3 wt.%.

5. The cleaning composition according to any of claims 1-4, comprising 0.001 -3 wt.% of a colorant and / or pigment, in particular 0.002-0.3 wt.%, and / or 1-5 wt.% thickener, and / or0.1 -5 wt.% of a surfactant, in particular 1-3 wt.% surfactant, and / or0.1 -10 wt.% of a further additive, in particular 1-6 wt.%, and / or wherein the remainder water is 10-90 wt.%, in particular 20-85 wt.%, more in particular 35- 80 wt.%, even more in particular 45-70 wt.%, such as 55-65 wt.%.

6. Method for removal of an aqueous adhesive or aqueous coating on a roller comprising providing the roller, the roller comprising an aqueous dispersion,providing a cleaning composition according to any of claims 1-5, applying the cleaning composition to the roller for a drying period, and removing the dried dispersion from the roller.

7. Method according to claim 6, wherein the roller is selected from a roller as such, from a roller in a roller system, and from a roll coater, in particular wherein the roller comprises a metal surface a polymeric surface, or a coated surface, to which an aqueous dispersion can be applied.

8. Method according to any of claims 6-7, wherein the drying period in case of application of a cleaning composition without cleaning activator, is from 2-20 hours, in particular from 3-12 hours, and in case of a cleaning composition with cleaning activator, is from 10 seconds- 1 hour, in particular from 20 seconds- 10 minutes, more in particular from 30 seconds- 1 minute.

9. Method according to any of claims 6-8, wherein the to be removed aqueous dispersion is selected from dispersions, coatings, 1 -component adhesives, two component adhesives, a bio- based adhesive, and combinations thereof, such as a film forming adhesive, wherein the film has a thickness of 100 μm- 10 mm, in particular a poly chloroprene comprising adhesive.

10. Method according to any of claims 5-9, wherein the dried adhesive is a film, and wherein the film is removed by hand, or wherein the film separates itself from the roller.

11. Method according to any of claims 6-10, wherein 0.001-1 ml cleaning composition per 1 cm2is provided, in particular 0.005-0.1 ml cleaning composition per 1 cm2, such as 0.010-05 ml / cm2.

12. Method according to any of claims 6-11, wherein the method is performed without providing additional water or additional aqueous composition, or wherein excess adhesive is first removed, in particular by applying water.

13. Method according to any of claims 6-12, wherein the roller comprises a metal surface for applying the aqueous dispersion.

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