JPH1053731A - Coat which facilitates removal of adherent substance, method of using the same, and article provided with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an article improved in the removal of adherent substances by forming on the surface of a base a coat which facilitates removal of adherent substances and comprises a water-swellable resin ingredient and a water-soluble compound and from which substances adherent to its surface can be repeatedly removed easily and rapidly. SOLUTION: The coat comprises a water-swellable resin ingredient and a water-soluble compound. Substances adherent to the surface of this coat can be repeatedly removed. The method of using the coat comprises contacting the coat with water, an aqueous solution, or steam to swell the coat having the adherent substances thereon, removing the adherent substances, and then drying the coat for reuse. The article comprises a base and the coat formed on the surface thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an easy-to-deposit material provided on the surface of a base material, which can easily remove the debris with water and easily clean the surface repeatedly. The present invention relates to a removal coating, a method of using the same, and an article having the deposit easily removing coating.

The coating for easily removing deposits according to the present invention, by its nature, does not prevent the deposition of deposits, but permits the deposition, and the deposits are easily removed only by water treatment. Because of this, the coating of the present invention herein is referred to as a deposit-removable coating.

[0003]

2. Description of the Related Art Conventionally, it is not easy to remove extraneous matter. Even with a liquid oil, it is necessary to add a surfactant to water and wash it with a great deal of trouble, or it is difficult for humans and the environment. It must be dissolved using some organic solvent.

In particular, in the case of a wax or solid, surfactants often make it almost difficult, and use of an organic solvent or heavy labor such as mechanical scraping is required, so that it cannot be completely removed, Often, the deposits are damaged or even irremovable.

[0005] For this reason, a peelable or dissolvable coating is formed on the surface and, at the same time, deposits are removed. However, a new coating must be formed each time or an extra film is formed. It is not an essential solution, such as generating waste.

As a coating capable of repeatedly removing deposits, there is a fluororesin (for example, Teflon (registered trademark)) coating. However, the coating is expensive, the surface which can be coated is limited, and the transparency is low. The range of use was narrow because of problems, or because it was difficult to use the adhered substance such as prints because the adhered substance was easily removed.

Further, OA sheets, such as OHP films and OA paper, are often discarded in large quantities because ink such as toner, which is an attached matter, cannot be removed, resulting in environmental problems.

As a means for solving such a problem, the present inventors have already made a hydrophilic resin which is solid at room temperature in the air and which is hydrophilic and swells with water but does not disappear. It has been proposed to fix a coating for easily removing deposits consisting of a film on the surface of a substrate. (JP-A-6-22
2604)

[0009]

However, in this kind of easy-to-adhere removal coating, it is possible to easily remove the adherence without adversely affecting the human body and environment only by washing with water. Strongly baked toner
In particular, in the case of a substance having a strong adhesive force or a substance having a strong stickiness and easily re-adhering, it takes time to remove, and it is necessary to repeat the removing operation. It is necessary to improve removability.

[0010]

DISCLOSURE OF THE INVENTION The present invention has been made as a result of various studies in view of the present situation, and is directed to a coating containing a water-swellable resin component and a water-soluble compound, wherein the coating material is adhered to the coating surface. Is intended to improve the property of removing adhering matter by making it possible to easily and quickly remove the adhering matter by forming a coating capable of easily removing adhering matter.

In addition, the coating for easily removing deposits is brought into contact with water, an aqueous solution or water vapor so that the deposits can be removed,
After removing the deposits, the material is dried so that it can be used repeatedly, thereby saving resources and solving environmental problems.

Further, a coating containing a resin component swelling with water and a water-soluble compound, which is capable of repeatedly removing deposits on the coating surface, is provided on a sheet-like base material or the like. By doing so, it is possible to easily and quickly remove the deposits, and to obtain an article with easy-to-removal deposits having improved deposit removal characteristics.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The coating for easily removing deposits according to the present invention is a coating containing a resin component which swells with water, and the mechanism for removing deposits is considered to be an action due to this swelling. That is, by containing a resin component that swells in the coating, the adhesion of the attached matter is reduced due to the hydration of the resin chains, and the distortion between the resin and the attached matter due to expansion and softening is caused. It is thought that the deposits attached to the coating surface can be removed. In the present invention, the deposits adhere to the coating surface. However, since the coating swells with water, the deposits on the coating surface can be removed repeatedly. Here, the term “adhered matter” referred to in the present invention refers to a substance that can adhere to the surface layer of the coating, and includes, for example, many water-soluble substances, oily substances, and the like,
The effect is more exhibited when the deposit is an oily substance or the like.

Further, since the water-soluble compound is used together with the resin component which swells with water, there is a component which is not fixed in the coating, and the non-fixed component swells with water. Inhibits the entanglement and arrangement / orientation of the molecular chains of the resin components, which maintains the mobility of the molecular chains. As a result, voids and the like are formed in the coating, thereby facilitating the penetration of water into the coating-adherent interface and the interior of the coating, and hydration, expansion, and softening of the resin chains. It seems that the time will be shorter.

The coating of the present invention needs to contain a hydrophilic resin component that swells with water. Examples of such a resin include a resin having a polar functional group or a hydrophilic chain. Specific examples of polar functional groups or hydrophilic chains include carboxylic acid groups, hydroxyl groups, sulfonic acid groups,
Examples include an amide group, an amino group, a phosphate group or a salt thereof, and a polyethylene glycol chain.

Examples of the resin having a functional group or a hydrophilic chain include (meth) acrylic acid, 2- (meth) acryloyloxyethyl succinic acid, vinyl alcohol, hydroxyethyl (meth) acrylate, dihydroxypropyl (meth) ) Acrylate, (meth) acrylamide-2
-Methylpropanesulfonic acid, (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N-
(Meth) acrylylglycinamide, N-isopropyl (meth) acrylamide, N, N-dimethylaminopropyl (meth) acrylamide, vinylpyrrolidone,
N-dimethylaminoethyl (meth) acrylate, allylamine, vinyl alcohol, vinyl carbazole or salts thereof, quaternized amino groups thereof, (meth) acrylates having oligo or polyethylene glycol chains And celluloses such as methylcellulose, ethylcellulose, propylcellulose, hydroxyethylcellulose and hydroxypropylcellulose. Examples include compounds, polyethylene glycol, or a combination of polyethylene glycol and other monomers, but the present invention is not limited thereto.

The hydrophilicity of the resin can be evaluated by the receding contact angle with water. The receding contact angle with water is 40 ° or less, more preferably 20 ° or less, and even more preferably 10 ° or less. A hydrophilic resin is preferably used.

The receding contact angle with water is determined by forming a water drop on a resin film, sucking up the water with a syringe or the like, and measuring the angle at which the water comes into contact with the resin when the end of the water drop starts moving inward with a protractor or the like. You can ask. If a specific aqueous solution, such as an aqueous solution containing an electrolyte, is required to remove the deposits, and if the treatment changes the hydrophilicity of the coating, it is necessary to measure after dipping and drying in the aqueous solution. is there.

Further, the resin component of the present invention preferably has a weight swelling ratio of 1.5 times or more in order to remove adhering substances. The weight swelling ratio of the swelling resin component is determined by immersing it in water for 24 hours. Weight of the coating when allowed to swell and 24
From the weight of the coating when dried to a constant weight for a period of time or more, it can be determined by (swelling weight of coating) / (dry weight of coating after swelling).

The simplest method is to form the coating of the present invention on a Teflon sheet, peel off the coating and put it in a net-shaped container, and immerse the lower part of the container in water. The sample used for the swelling ratio measurement is often fixed to the substrate, but even with such a coating, the coating can be immersed in water with the substrate, or only the coating can be peeled off from the substrate by rapid cooling. Alternatively, the base material may be separated from the base material by shaving or the like, placed in a net-shaped container, and the lower part of the container may be immersed in water.

In the former case, in particular, the coating thickness of the dried sample after swelling is measured by cross-sectional observation with an electron microscope, or the coating is partially peeled off, and the step is measured by a stylus-type film thickness meter or a laser microscope. The dry weight of the coating alone after swelling may be calculated by determining the total thickness including the base material by the cross-sectional observation or micrometer, etc. The above equation is expressed by [(total swelling weight) − (total swelling dry weight)
+ (Dry weight of coating after swelling)] / (dry weight of coating after swelling).

As such a resin component which swells with water, it is effective to use a crosslinked resin. For example, a resin having a crosslinkable functional group is used as the resin component. Is reacted with a functional group of a crosslinking agent, or by reacting functional groups of a resin component with each other. It is also effective to perform physical crosslinking by hydrogen bonding, ionic bonding, hydrophobic interaction, or the like.

Here, as the resin having a crosslinkable functional group, a resin obtained by homopolymerizing or copolymerizing a monomer having a crosslinkable functional group or a monomer having a reactive functional group may be used.
And a resin in which a compound having a crosslinkable functional group is bonded to at least a part of the functional groups.

The functional group used for crosslinking, ie, the functional group introduced into the resin component or the crosslinking agent, includes an epoxy group, a carboxyl group, an isocyanate group, a double bond,
Examples include acids, acid chlorides, acid anhydrides, hydroxyl groups, amino groups, oxazolines and the like. Further, as the cross-linking agent, it is preferable to use a compound having two or more of these functional groups.

In order to introduce these functional groups into the components,
For example, a monomer exhibiting swelling properties in water, glycidyl (meth) acrylate, (meth) acrylic acid,
2- (meth) acryloyloxyethyl succinic acid, (meth) acryloyloxyethyl isocyanate, hydroxyethyl (meth) acrylate and the like may be copolymerized. Further, a double bond can be introduced by reacting (meth) acrylic acid with the introduced glycidyl group. Upon crosslinking, heating, ultraviolet light, or radiation irradiation may be performed depending on the functional group used.

When strong adhesion to the substrate is required, the surface of the substrate to be coated is treated, or a layer different from the substrate is provided on the surface of the substrate to be coated. Is also effective.

For example, in order to improve the adhesiveness, a treatment with parachlorophenol, trifluoroacetic acid, a silane coupling agent, a titanium coupling agent, an azide compound, various polymers or the like or a lower layer can be used. When the swelling ratio of the coating and the substrate to be coated are different, a lower layer having a medium swelling ratio can be used in order to absorb the strain generated therebetween.

As described above, the coating for easily removing deposits according to the present invention is a coating containing a resin component which swells with water, and is capable of repeatedly removing deposits on the surface of the coating. In this case, it takes a long time to remove, for example, a substance having a strong adhesive force or a substance having a strong stickiness and easily re-adhering, and it is necessary to repeat the removing action.

[0029] For this reason, a study was conducted to improve the removal property of the deposits by making it possible to remove the deposits easily and quickly, and it was apparent that this problem could be solved by using a water-soluble compound in the coating. It became.

That is, by adding a water-soluble compound to the coating, there are components that are not fixed in the coating, and the components that are not fixed are entangled in the molecular chains of the resin component or the arrangement of the resin component. Inhibits the orientation to maintain the ease of movement of the molecular chains, and also forms voids and the like in the coating by eluted by contact with water, such as micro-sites where small molecules where these components are gathered easily pass. This facilitates the penetration of water into the coating-adherent interface and the interior of the coating, and promotes hydration, expansion, and softening of the resin chains, which may reduce the adhering substance removal time.

Such water-soluble compounds are often eluted from the coating when removing the deposits with water, but even if they are eluted, the effect of the present invention is maintained for the above-mentioned reason, and there is no problem.

Further, such a water-soluble compound needs to coexist with a resin component which swells with water in a dry state at the time of production of a coating for easily removing deposits or use, and a substance having low volatility is preferably used. For example, a substance having a higher boiling point than water or a substance having a lower vapor pressure than water is preferably used.

Further, such a water-soluble compound can be used in a range where a resin component which swells with water can be formed at the time of production, or in a range where a coating can swell when added later. The optimum value of the amount used depends on the resin used, the cross-linking agent, the degree of cross-linking, the form of use, the attached matter to be treated, the method of removing the attached matter, and the like.
1% by weight or more, preferably 1% by weight or more and 90% by weight or less, most preferably 5% by weight or more and 70% by weight or less.

The water-soluble compound may be liquid or solid at room temperature or operating temperature. However, depending on the method of removing the deposit, the water-soluble compound below the place where the deposit is attached is eluted. It is difficult to be performed, and traces of the deposits may remain after the deposit removal processing. When it is not preferable to leave a trace, it is preferable to use a water-soluble component that is liquid at room temperature or use temperature.

Representative examples of such water-soluble compounds include ethylene glycol, diethylene glycol,
Low molecular weight compounds such as triethylene glycol, glycerin, trimethylolpropane, polyethylene glycol,
Examples include polypropylene glycol having a number average molecular weight of 5,000 or less, and oligomers or polymers obtained by homopolymerizing or copolymerizing various hydrophilic monomers. Examples of the hydrophilic monomer include monomers having a polar functional group represented by a resin component that swells with water on the surface of a substrate, and these can be used alone or in combination.

[0036] The coating for easily removing deposits may contain other various substances as necessary.
For example, inorganic or organic powders, antistatic agents, plasticizers,
A lubricant, a dye, a pigment, a dispersant, a resin other than the above-mentioned purpose, and the like may be included. In addition, under the coating for easy removal of deposits,
In addition to the layer for improving the adhesion, an antistatic layer,
A layer such as a colored layer may be provided.

As a method for producing the coating for easily removing deposits according to the present invention, a method in which a water-soluble compound is mixed in advance with a swelling resin component before film formation and then a coating is formed, and a water-soluble compound is added after film formation. Although any of the methods can be used, the former method is effective for forming the above structure.

The thickness of the coating for easily removing deposits in the present invention is preferably from 0.05 μm to 50 μm, more preferably from 0.1 μm to 30 μm. When it is thin, the number of times it can be used repeatedly decreases, and when it is thick, the coating that easily removes deposits tends to be damaged when removing deposits.

Further, the present invention needs to be capable of repeatedly removing adhered substances, so that if the entire coating flows out, it cannot be used repeatedly.
The gel fraction is preferably 5% by weight or more,
More preferably, it is at least 20% by weight.

The coating for easily removing deposits according to the present invention needs to be solid at room temperature in the air in order to maintain the shape or the coating. 6B in pencil scratch test
If it is above, it is often preferable, and 2B or more is more preferable. In addition, it is practically preferable that no sticking or adhesion occurs when the coatings for easily removing deposits are brought into contact with each other.

Further, the coating for easily removing deposits according to the present invention comprises:
Because of the coating, it is often preferable to have transparency depending on the application. In general, the transmittance of light having a wavelength of 550 nm is preferably 50% or more, and more preferably 70% or more, depending on the use.

Further, a substrate having a sheet-like material to be coated can be applied to a wide range of applications. For example, there is a case where a removable substance is ink. This is a typical example in which the present invention exhibits excellent effects. In particular, when the method of applying ink is copying, printing or printing, it is useful for solving the problem of paper dust generated in offices and the like. Very effective.

Above all, the amount of paper dust due to copying by a copying machine or printing or printing by a printer or a typewriter is remarkably increased. Therefore, the coating on the sheet-like base material has an affinity for the ink used for these. Having a copy,
It is printable or printable, and is very effective for use in removing these inks.

It is particularly effective to use toner inks used in electrophotographic copying or laser printers in view of the recent usage in offices.

It is of course also effective to correspond to inks used for printing or printing by other methods. Examples of such inks include ink-jet inks, heat-sensitive ribbon inks, impact inks, and typewriter ribbon inks. Can be

In these cases, it is preferable that the coating on the sheet-like substrate has heat resistance and mechanical properties which are not deteriorated before and after the step of applying ink by copying, printing or printing.

As the sheet-like base material, a resin film, paper, metal foil, a composite material or a laminated material thereof can be suitably used depending on the application, and copying, printing or printing is possible. It is preferable to have a high flexibility and thickness, and to maintain flatness before and after the ink attaching and removing steps. In other words, it is preferable to have heat resistance, water resistance, mechanical properties, or shape memory that can maintain flatness.

It is also preferable that the coating has a shrinkage or expansion ratio that can maintain flatness before and after the step of adhering ink by copying, printing or printing and removing the adhering ink. In the case where the coating is provided on both sides of the sheet, the influence of the shrinkage ratio and expansion ratio is offset on both surfaces, so that a coating having a relatively wide range of shrinkage ratio or expansion ratio can be used. The flatness that is maintained is that the floating width of the most raised portion when the sheet is placed on a flat surface is 20 m.
m is preferable.

In addition to the case where the method of adhering the ink is copying, printing or printing, it is generally preferable that the ink can be applied and removed by a writing instrument.

The resin component of the present invention is required to swell with water. However, in a specific application, for example, the adhesion of the ink, the swelling required for removing the adhering matter is limited only in a specific temperature range. It is more practical if it is obtained. That is, it is more preferable that the adhered matter adheres but is not easily removed during use, and that the adhered matter removing property is high only in a removing step using a temperature different from the use temperature. For example, when used at room temperature, if the above-removable temperature range is 28 ° C. or more, even in use,
It is also suitable for the design of the removal step. Also, depending on the removal method, the difference between the swelling ratio at the use temperature and the removal temperature is different.
When it is 1.5 times or more, the above-mentioned practical effect is easily obtained.

Examples of the resin having an effect only in such a specific temperature range include a resin having a nitrogen-containing group and / or an organic acid group or a combination of these resins.
Examples of the nitrogen-containing group and the organic acid group include an amide group, an amino group, and a carboxylic acid group. Resins having these functional groups or a combination of resins include (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N-
Homopolymers such as (meth) acrylylglycinamide, N-isopropyl (meth) acrylamide, N, N-dimethylaminopropyl (meth) acrylamide, vinylpyrrolidone and (meth) acrylic acid, copolymers, and other substances And a combination thereof.

Representative examples include combinations of polyacrylic acid and polyacrylamide, polyacrylic acid and polyacrylylglycinamide, and polyacrylic acid and polydimethylacrylamide.
Swelling at the molecular level in the presence of water at a temperature of 9 ° C. or higher has been academically proved [Hiroki Uenono et al., Edited by the Colloquium Symposium of Surface Colloquium, Surface, 30 , 32 (1992)].

The coating of the present invention makes it possible to easily remove deposits with water. If the step of removing deposits is performed with water, the coating has little adverse effect on the environment and is more effective. In addition, it is effective to use water having a high temperature of 30 ° C. or more, and it is possible to greatly improve the time for removing the deposits, and the same effect can be obtained even when the coating is brought into contact with water and then heated. When swelling is insufficient due to water alone and removal is difficult, or when it is desired to increase the swelling speed to increase the removal efficiency, it is often effective to use water containing an electrolyte, alcohol, or the like.

As an electrolyte, a salt,
A base or acid can be suitably used. Examples thereof include electrolytes such as baking soda, sodium chloride, acetic acid, potassium hydroxide, sodium hydroxide, hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid, disodium hydrogen phosphate, ethyl alcohol, isopropyl alcohol, methyl alcohol. And various commonly known buffers.

An aqueous solution containing a water-soluble compound may be used. In this case, it is effective for maintaining various properties of the coating, and is particularly effective when the water-soluble compound is added after the production.

It is also effective to include a surfactant or the like in water in order to increase the removal efficiency. Any of anionic, cationic, and nonionic surfactants can be used, and it is preferable to select and use a surfactant having a high effect depending on the type of the coating resin and the substance to be removed.

Further, water can be used as mist or steam. When the coating is brought into contact with the coating in such a state, the outflow of a water-soluble substance, or when a salt or a group capable of forming a salt is used as a polar functional group in the resin component or the water-soluble compound, the outflow of a counter ion, ion exchange or new ion exchange. It is often effective because it hardly produces a salt. In this case, it is effective to increase the temperature.

When the water used in the adhering matter removing step is directly discarded or when the water may come into direct contact with the human body, the substance contained in the water and the coating may be a substance having a small adverse effect on the environment. Preferably, it is a biodegradable substance.

Deposits are removed by the above-mentioned swelling with water or the like, but the coating can be dried to make it reusable. The drying temperature is determined in consideration of the properties of the base material, but is generally preferably from 5C to 150C.

The coating for easily removing deposits according to the present invention can be widely used for removing deposits, and can be used, for example, as follows.

For the purpose of removing inks, O
O such as HP sheets, paper or paper-like products, sheets for cel drawings, etc.
Can be used for A-sheet.

For the purpose of removing dirt such as oil, it can be used for building materials, furniture, ventilation fans, kerosene appliances, electric appliances, gas appliances, tools, tableware, and other various daily necessities. In particular, the present invention is effective for those used in places where dirt such as oil and paint easily occurs, such as around a kitchen, a work place using machines and the like, and a work place handling paint and the like.

Further, for the purpose of masking, it can be used for painting or creating graphics. In addition, it can be used as an anti-fogging film because of its excellent hydrophilic property of swelling in water.

It can be seen that such an application can be sufficiently handled.
In the following, an example of removing adhered matter which is particularly strongly adhered among adhered substances called toner ink printed in copying by a copying machine of an electrophotographic copying method will be described.

[0065]

Next, an embodiment of the present invention will be described. Example 1 Methacrylic acid 9 parts by weight Acrylic acid 1 〃 2-hydroxyethyl methacrylate 13 〃 Acrylamide 1 〃 N, N-dimethylaminoethyl methacrylate 1 〃 Azobisisobutyronitrile 0.38 イ ソ プ ロ ピ ル Isopropyl alcohol 142〃 This composition was placed in a flask equipped with a condenser and reacted at 70 to 80 ° C for 10 hours while stirring under a nitrogen stream to obtain a 15% by weight isopropyl alcohol of hydrophilic resin A.
Solution was obtained. Next, using the obtained 15% by weight isopropyl alcohol solution of the hydrophilic resin A,

Resin A 15% by weight isopropyl alcohol solution 10 parts by weight Sodium hydroxide 0.1 {Epoxy crosslinker [1,3-bis (N, N-diglycidylamide 0.075} nomethyl) cyclohexane] Polyethylene glycol # A composition of 200 (number average molecular weight: about 200) 0.30% was mixed and stirred at room temperature to obtain a resin solution.

Next, the obtained resin solution was coated with a thickness of 10
A 10 μm wet thickness is applied to a polyethylene terephthalate film which has been subjected to a 0 μm easy-adhesion treatment (polyurethane treatment), dried, and then subjected to a high-temperature treatment at 110 ° C. for 5 hours. Was prepared.

Example 2 The procedure of Example 1 was repeated except that the same amount of polyethylene glycol # 400 (number average molecular weight: about 400) was used instead of polyethylene glycol # 200 in the preparation of the resin solution in Example 1. In the same manner, a coating sheet for easily removing deposits was prepared.

Example 3 Example 1 was repeated except that the same amount of polyethylene glycol # 1000 (number average molecular weight: about 1000) was used in place of polyethylene glycol # 200 in the preparation of the resin solution in Example 1. In the same manner, a coating sheet for easily removing deposits was prepared.

Example 4 In the preparation of the resin solution in Example 1, polypropylene glycol # 200 was used instead of polyethylene glycol # 200.
The same procedure as in Example 1 was carried out except that the same amount of # 400 (number-average molecular weight: about 400) was used to prepare a coating sheet for easily removing deposits.

Example 5 In the preparation of the resin solution in Example 1, the same procedure as in Example 1 was repeated except that the same amount of ethylene glycol was used instead of polyethylene glycol # 200. -Was prepared.

Example 6 In the preparation of the resin solution in Example 1, the same procedure as in Example 1 was carried out except that the same amount of diethylene glycol was used instead of polyethylene glycol # 200. Was made.

Example 7 In the preparation of the resin solution in Example 1, the same procedure as in Example 1 was repeated except that the same amount of glycerin was used in place of polyethylene glycol # 200.
Was made.

Example 8 Easily removed deposits in the same manner as in Example 1 except that the amount of polyethylene glycol # 200 was changed from 0.30 parts by weight to 1.5 parts by weight in the preparation of the resin solution in Example 1. A coated sheet was prepared.

Example 9 In the preparation of the resin solution of Example 5, the amount of polyethylene glycol added was 0.015 parts by weight (1 part per coat).
% By weight), 0.075 parts by weight (5% by weight), 1.5 parts by weight (50% by weight), and 3.0 parts by weight (67% by weight) in the same manner as in Example 5, except that -Was prepared.

Comparative Example 1 A coated sheet for easily removing deposits was prepared in the same manner as in Example 1 except that polyethylene glycol # 200 was omitted in the preparation of the resin solution in Example 1.

Characters were copied by a copy machine of an electronic copying system onto the coated sheets obtained in Examples 1 to 8 and Comparative Example 1 so that toner ink was adhered thereto, and 1% by weight of sodium bicarbonate was added. The time required for the first ink removal by the aqueous solution and the time required for the ink removal when the toner ink was adhered and the toner ink was adhered again after removing the ink were examined. The copying machine is Xerox 5075, and the pattern to be copied is 1c.
Five solids of m-square were rubbed slowly with a cellulosic sponge for photography without applying force, and the time required to peel off all five solids was visually measured.

Further, the weight swelling ratio of the coating was determined. The weight swelling ratio of the coating was determined by separately forming the coatings of Examples and Comparative Examples on a Teflon sheet so as to have a thickness of 100 μm after drying. The weight of the coating when the lower part of the coating was swelled by immersion in water for 24 hours, and the coating when the coating was dried to a constant weight for 24 hours or more after swelling, ((swelling weight of coating) / (after swelling of coating) (Dry weight). Also, the gel fraction of the coating was determined. The gel fraction of the coating is obtained from the dry weight of the film before and after the above-mentioned weight swelling ratio measurement operation, (weight before immersing the coating in water) / (dry weight after swelling of the film) × 100 (unit%). It is a thing. Table 1 below
Is the result.

[0079]

FIG. 1 shows the results obtained by measuring the easily-adhered material removal characteristics of the easily-adhered material sheet obtained in Example 9 in the same manner as in Example 1. The solid line is the first time, and the dotted line is Is the second result. FIG. 1 also shows the first and second results obtained in Comparative Example 1 and Example 5.

[0081]

As is clear from Table 1 above, the coatings for easily removing deposits (Examples 1 to 8) obtained by the present invention are compared with the coatings of Comparative Example 1 which consist only of the resin component which swells with water. However, it can be seen that the time required for removing the toner ink is reduced, and that the toner has excellent removal characteristics even when used repeatedly. In addition, in the second removal of deposits, it is considered that the water-soluble compound was caused to flow out by the first water, but it can be seen that the effect of the coating of the present invention is maintained.

As shown in FIG. 1, by adding 1% by weight of ethylene glycol as a water-soluble compound,
It can be seen that the removal characteristics are improved and the removal characteristics are most excellent at around 20% by weight. As is clear from Table 1 and FIG. 1, among the deposits of baked toner, the deposits which adhered particularly strongly can be removed in a short time, so that it goes without saying that the same applies to other deposits. Absent.

Therefore, it can be seen that the coating for easily removing deposits obtained by the present invention can remove the deposits in a short time, and is effective for reuse, cleaning, masking and the like of the substrate.

[Brief description of the drawings]

FIG. 1 is a graph showing the relationship between the amount of ethylene glycol added and the copy pattern removal time of a sheet for easily removing deposits obtained in Example 5.

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Claims (13)

[Claims] 1. A coating containing a resin component swellable by water and a water-soluble compound, wherein the coating on the coating surface can be removed repeatedly. 2. The resin component swelling with water is a hydrophilic resin having a contact angle with water of 40 degrees or less.
Easily removable coating described 3. The coating according to claim 1, wherein the resin component swellable by water has a weight swelling ratio of 1.5 times or more. 4. The coating according to claim 1, wherein the water-soluble compound is a substance having a higher boiling point than water or a substance having a lower vapor pressure than water. 5. The water-soluble compound according to claim 1, wherein the water-soluble compound is at least one water-soluble compound selected from a compound obtained by homopolymerizing or copolymerizing polyol, polyoxylen, and a monomer having a polar functional group. Easily remove deposits 6. The method according to claim 1, wherein the polyol is polyethylene glycol.
, Polypropylene glycol, ethylene glycol,
6. The coating according to claim 5, which is at least one or more polyols selected from diethylene glycol and glycerin. 7. A method for coating a water-soluble compound in a coating for easily removing deposits.
The coating for easily removing deposits according to claim 1, wherein the coating is contained in an amount of 0.1% by weight or more. 8. A deposit obtained by contacting the easily removable coating according to any one of claims 1 to 7 with a component selected from the group consisting of water, an aqueous solution and steam, and then drying. Easy removal coating 9. A method for using a coating which contains a resin component and a water-soluble compound which swells with water and which is capable of repeatedly removing deposits on the coating surface, wherein the deposits adhere to the coating. A method for using a coating that easily removes deposits, wherein the coating is swelled in a state of being exposed to water, an aqueous solution, or steam to remove deposits, and then dried and reused. 10. The method according to claim 1, wherein a surface of the base material is provided.
An article having the coating for easily removing deposits according to any one of the above. 11. The substrate according to claim 10, wherein the substrate is a sheet-like substrate.
Article having the coating for easily removing deposits according to the above. 12. The article having an easily-removable deposit according to claim 11, wherein the article is an OA sheet. 13. An article having the coating for easily removing deposits according to claim 10 is brought into contact with a component selected from the group consisting of water, an aqueous solution, and steam, and then dried. Having a coating for easily removing deposits obtained by the method