JP2000284517A - Recyclable recording material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve drying property of a recording material while maintaining good paper feeding property and paper passing property in a printing device by forming a functional face different from a water swellable resin face on a non-printing face. SOLUTION: This material for recording consists of a substrate 1, a surface layer 3 laminated on the printing face of the substrate 1, and a functional face 5 different from a water-swellable resin face on the non-printing face. As for the substrate 1, a material having water resistance consisting of a transparent plastic film or a film converted into opaque by addition of inorganic fine particles is preferably used. The surface layer 3 formed on the printing face consists of a water-swellable resin and prepared by crosslinking a water-soluble resin. The water-soluble resin is modified with ions to improve the hydrophilicity and to increase the swelling rate of the surface layer 3. The functional face 5 different from the water-swellable resin face is formed on the non-printing face, and a friction controlling function is added to the face 5. By forming the plane having a function to control the coefficient of friction, the drying property can be improved while the good paper feeding property and paper pausing property in a printing device is maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording material capable of removing a printing material adhered to the recording material by forming an image with a copying machine, a printer or the like from the recording material, and reusing the recording material repeatedly. In particular, the present invention relates to a recording material suitable for a removing means by physical rubbing force such as a brushing method using an aqueous solvent such as water.

[0002]

2. Description of the Related Art Today, electrophotographic copying (so-called copying) techniques using toner have become widespread, and recording materials such as paper and OHP sheets have been used in large quantities.

[0003] Printing materials printed or copied on such a recording material cannot be easily removed, and since such technology has not been put into practical use, printed matter generated in large quantities in offices is unnecessary. The reality is that they are just discarded.

It is obvious that this is not preferable for environmental protection and resource protection. Therefore, techniques for regenerating or recycling the recording material to be discarded are being actively studied. For example, in JP-A-6-222604, a swelling layer swelling with water is formed on the surface of a recording material, and the swelling layer is wetted with water and swelled to record on the recording material. A method for removing an image is disclosed. The recording material of the publication is a resin film, paper,
A swelling layer swelling with water is provided on the surface of a base material such as a metal foil. However, when such a configuration is adopted, physical properties are different between the front surface (printing surface), that is, the surface provided with the swelling layer, and the back surface (non-printing surface), that is, the surface of only the base material, and various problems occur.

[0005] For example, the surface swelling surface and the substrate surface have different surface friction coefficients. In particular, since the surface of the base material is uniformly applied to the surface layer, a material having a high smoothness is often used, and the contact area becomes large when the sheets are overlapped, so that the material having a generally high friction coefficient is often used. . When a recording material having such a difference in physical properties is used, there is a problem of paper passing property in a printing device such as a copying machine or a printer.

[0006] Due to the characteristics of the product, various types of such recording materials (for example, all products sold by each manufacturer) are used.
It is required that printing can be performed by a printing device such as a copying machine or a printer. For example, when a recording material is set in a paper feed cassette by a copier or a printer, a large number of recording materials are stacked and left alone, making it difficult to separate and separate recording materials having a high coefficient of friction. Come. In such a state, a so-called double feed phenomenon occurs in which the recording materials cannot be fed one by one at the time of feeding, and a plurality of recording materials are fed simultaneously. This phenomenon does not occur when sheets are fed manually one by one.However, if they are left over and stored, the recording materials will still adhere to each other. It becomes difficult and there is a problem in handling.

For example, when a recording material is immersed in an aqueous solvent such as water, the coefficient of expansion, that is, the degree of swelling differs between the water-swellable surface and the substrate surface. In particular, since the base material surface uses a resin sheet, water-resistant paper, etc., there is almost no dimensional change due to water immersion, and only the surface layer expands due to water immersion, so there is a difference in dimensions between the front and back of the recording material. As a result, the recording material is curled as a result. Further, even when the recording material is dried after being immersed, curling or wrinkling may occur due to a difference in shrinkage. In particular, when the difference in dimensional change is large and sharp, this phenomenon is remarkable.

[0008] Such a recording material is one in which the steps of printing, deinking (immersion in water), and drying are repeatedly reused due to the characteristics of the product. If excessive curling occurs due to immersion or drying as described above, it becomes difficult to feed paper even if it is used in a printing device such as a copying machine or a printer for the next printing, and furthermore, poor paper passing, jamming, etc. Various problems will occur.

On the other hand, the present applicant has found a recyclable recording material in which a surface layer which is a functional layer is coated on both sides of a base material, and which can be used on both sides, and has reported this (Japanese Patent Application No. Hei 10 (1998) -108).
-182109).

However, when a water-swellable surface layer is provided on both sides as described above, it is necessary to sufficiently consider the drying property of the recording material. The recording material used in the application of the present invention requires a step of impregnating water or an aqueous solvent during the recycling step. In such a state of being impregnated with water or the like, printing cannot be performed by the printing apparatus. Therefore, a step of heating the water to evaporate water and drying the water is required. However, if a water-swellable surface layer is provided on both sides, the amount of water absorbed becomes twice as much, and the energy required for drying is twice as much.

There is also a point to be considered when a recyclable recording material used as an OHP film is prepared by using a transparent resin sheet such as a PET sheet and providing a water-swellable surface layer on both surfaces thereof. .

An OHP film is required to have a function of transmitting light. For example, in Japanese Patent Application Laid-Open No. H8-102395, the transmittance of all light or
Although a recyclable OHP film having 0% or more is disclosed, higher light transmittance is more preferable. The required value of the transmittance cannot be particularly defined here, but when the transmittance is low, the non-printed portion becomes dark on the screen, and the difference from the printed portion becomes unclear. Therefore, when producing a recyclable recording material to be used as an OHP film, the transmittance must be sufficiently considered.

[0013]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is directed to a recyclable recording material capable of satisfactorily removing a printing material such as toner.
While ensuring good paper feeding and paper passing properties in the printing device,
Another object of the present invention is to provide a recording material that does not impair the drying property.

Another object of the present invention is to provide a recyclable recording material having a transparent film as a base material which can be used as an OHP film and which ensures the above characteristics and does not impair the light transmittance. The purpose of.

[0015]

SUMMARY OF THE INVENTION The object of the present invention is to provide a recyclable recording material in which a water swelling property is applied to the back surface (non-printing side) of the back side with respect to the printing side provided with the water swelling resin. This is achieved by providing a functional surface different from the resin surface. The functional surface different from the water swellable resin surface is different from the water swellable resin provided on the printing surface side of the recording material, and has a function of adjusting a friction coefficient, curling reduction or both a friction coefficient adjustment and curl reduction. It is.

In the present invention, a water-swellable surface layer is not formed on the non-printed surface, and a functional surface different from such a water-swellable resin surface is provided.
The paper feeding property and the paper passing property can be improved, and the necessary light transmittance can be secured.

[0017]

FIG. 1 is a schematic sectional view of a recording medium according to an embodiment of the present invention. As shown in FIG. 1, this recording material has a surface layer 3 on one side (printing side) of a substrate 1 and a functional side 5 different from the water-swellable resin side on the other side (non-printing side). It was done. FIG. 1 shows a state where the printing material 4 is printed on the surface of the surface layer 3.

The substrate 1 is preferably a water-resistant (strength), transparent plastic film or an opaque plastic film by adding inorganic fine particles. Although the material of the plastic film is not particularly limited, polyester, polycarbonate, polyimide, polymethyl methacrylate and the like are preferable in consideration of heat resistance and the like. Further, in consideration of versatility, price, heat resistance, durability and the like, polyester, particularly polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and the like are desirable. It is also possible to use various sheets available as OHP. In addition, so-called synthetic paper such as paper made of plastic fiber such as PET fiber or paper based on plastic is also commercially available, and such synthetic paper is also useful as a base material. Besides this,
Metal foil, paper having improved water resistance, and composite materials such as resin, paper, and metal can also be used. In addition, flatness can be maintained through printing and removal of printing material,
Any material having water resistance and appropriate mechanical strength can be used.

The surface layer formed on one side (printing side) of the substrate is made of a water-swellable resin. Water swelling means swelling but not dissolving in water or an aqueous solvent. Water-swellable resins are made by crosslinking water-soluble resins.

As the water-soluble resin, a water-soluble resin having a functional group having an active hydrogen such as a hydroxyl group, an amino group, an amide group, a thiol group, a carboxyl group, a sulfonic acid group in a molecule,
For example, polyvinyl alcohol, methyl cellulose, polyacrylic acid, carboxymethyl cellulose, hydroxyethyl cellulose, polyvinyl pyrrolidone, polyacrylamide, diacetone acrylamide and the like can be used.
Preferably polyvinyl alcohol, methyl cellulose,
Polyacrylic acid is used, and among them, polyvinyl alcohol having many hydroxyl groups is preferable, and the degree of polymerization is 300 to 300.
0, preferably 500-2000, more preferably 50
It is preferably 0 to 1700. It is appropriate that such a water-soluble resin is used after being dissolved in 2 to 30 parts by weight, preferably 5 to 10 parts by weight, based on 100 parts by weight of the aqueous medium.

Further, ion-modified resin may be used as the water-soluble resin. Here, ionic modification refers to imparting ionicity to some of the above functional groups of the water-soluble resin. By ion-modifying the water-soluble resin in this way, it is possible to improve the hydrophilicity of the water-soluble resin, thereby improving the water absorption of the obtained surface layer, and increasing the swelling speed of the surface layer.

The functional group imparted with ionicity may be any one of an anionic functional group and a cationic functional group. The anionic functional group is not particularly limited as long as it is a functional group having an anionic property.For example, a carboxyl group or a sulfonic acid group in which active hydrogen is substituted with a metal,
Examples include those in which active hydrogen of the above functional group is substituted by a substituent having a terminal at the terminal of a carboxyl group or a sulfonic acid group in which active hydrogen has been substituted with a metal. The cationic functional group is not particularly limited as long as it has a cationic functional group,
For example, a quaternized amino group, one obtained by substituting active hydrogen of the above functional group with a substituent having a quaternized amino group at the terminal, and the like can be mentioned.

To crosslink the water-soluble resin, a crosslinking agent and, if necessary, an initiator may be added to the aqueous solution of the resin.
Any crosslinking agent may be used as long as it has reactivity with a functional group such as a hydroxyl group, an amide group or a carboxyl group present in the water-soluble resin molecule and can crosslink the water-soluble resin. For example, an epoxy compound, an isocyanate compound, a methylol compound, an aldehyde compound, an aziridine compound, a melamine resin, a dicarboxylic acid, a dihydrazide, and the like, and a compound having a double bond, for example, a diacrylate compound, a dimethacrylate compound, and the like can be given.

Examples of the epoxy compound include polyethylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, sorbitol polydiglycidyl ether, sorbitan polydiglycidyl ether,
And polyglycerol polyglycidyl ether. In addition to these, various epoxy compounds can be used.

As the isocyanate compound, those having two or more isocyanate groups in one molecule can be used. By using a compound having a plurality of isocyanate groups, the substrate and the surface layer surface can be more firmly bonded.

Examples of the isocyanate include 4,4′-diphenylmethane diisocyanate,
4'-methylenebiscyclohexyl isocyanate, tris (p-isocyanatophenyl) thiophosphate, tris (p-isocyanatophenyl) methane, trimethylolpropane tolylene diisocyanate triadduct, aliphatic poly- yl having a hydrophilic group in the molecule Isocyanates and the like can be used.

The isocyanate used in the present embodiment, including these compounds, may be protected with phenol, sulfurous acid and the like.

Examples of the methylol compound include methylolated melamine such as dimethylolmelamine and trimethylolmelamine, dimethylolated urea, and melamine-formaldehyde resin. In addition to these, various methylol compounds can be used, and those having a moderately high molecular weight and those having a moderately long molecular chain are preferable. From this viewpoint, among the methylol compounds exemplified above, melamine- Formaldehyde resins are preferred.

Examples of the aldehyde compound include glyoxal and glutaraldehyde. In addition to these, various aldehyde compounds can be used.

As the aziridine compound, for example, diphenylmethane-bis-4,4'-N, N'-diethylurea, 2,2-bishydroxymethylbutanol-tris- [3- (1-aziridinyl) propinate] is used. can do. Further, an oxazoline group-containing polymer can also be used.

When the above compound is added as a cross-linking agent, the amount of the cross-linking agent varies depending on the resin, the type of the cross-linking agent, the molecular weight, the reaction conditions and the like, but cannot be specified unconditionally. It is added in an amount of 0.5 to 50 parts by weight, preferably 1 to 40 parts by weight. If the addition amount is too small, insufficient film strength at the time of swelling may become a problem or the film may be dissolved. On the other hand, if the addition amount is too large, the restraint between the resin molecular chains increases, and sufficient swelling property cannot be obtained, so that sufficient image removing performance cannot be obtained.

The use of a water-soluble or hydrophilic cross-linking agent has the advantage that the surface layer can be formed using water. Therefore, it is possible to prevent the organic solvent from remaining on the surface layer while ensuring the safety at the time of application.

A surfactant may be added to the resin solution constituting the surface layer so as to improve the coating property (wetting property) and water permeability. As the surfactant, various surfactants such as anionic, cationic and nonionic can be used,
There are no particular restrictions. The amount of surfactant added is 10
0.1 to 20 parts by weight relative to 0 parts by weight, preferably 0.1 to 20 parts by weight.
5 to 10 parts by weight are preferred. The cationic surfactant has a function as an antistatic agent, and also contributes to improving paper passing properties. From the viewpoint of antistatic, it is also possible to use an antistatic agent other than the nonionic surfactant. When imparting antistatic properties in this manner, an antistatic agent may be included in the surface layer, but after forming the surface layer, a solution in which the antistatic agent is dissolved or dispersed in an appropriate solvent is applied to the surface layer. May be applied.

In order to improve the writability, inorganic fine particles such as silica, titanium oxide, alumina, zinc oxide and calcium carbonate may be added to the surface. When such inorganic fine particles are added, 0.5 to 0.5 parts by weight of the water-soluble resin is added.
To 200 parts by weight, preferably 3 to 30 parts by weight.

As a method for forming the surface layer, a solvent coating method can be used. Specifically, the above water-swellable resin material, that is, a water-soluble resin material, a crosslinking agent, and other additives as necessary are dissolved and dispersed in a suitable solvent such as water, a water / organic solvent mixture, or an organic solvent. The thickness after heating and drying on one side (printing side) of the substrate is 0.5 to 30 μm, preferably 5 to 30 μm.
What is necessary is just to apply so that it may be set to 20 micrometers.

In FIG. 1, the base material 1 and the surface layer 1 are clearly and clearly distinguished by a boundary line therebetween. However, when the base material is synthetic paper such as plastic fiber, the surface layer forming material is the base material. The boundary between the substrate and the surface layer cannot be clearly drawn because it is formed by penetrating from the surface. However, in the present invention, the term “surface layer” is used in the sense of including such a mode that the base fiber and the surface layer forming material are mixed. This means that there may be a similar form in the relationship between the intermediate adhesive layer or the functional surface different from the water-swellable resin surface, which will be described in detail later, and the base material. The term "functional surface different from that of the intermediate adhesive layer or the surface of the water-swellable resin" includes a mode in which a material of a functional surface different from the surface of the adhesive layer or the surface of the water-swellable resin is mixed.

A functional surface 5 different from the water-swellable resin surface is formed on the other surface (non-printing surface) of the substrate 1. Hereinafter, a functional surface different from the water-swellable resin surface will be described, taking as an example a case where a friction adjusting function is imparted to a functional surface different from the water-swellable resin surface. Hereinafter, the function surface for adjusting the friction coefficient is referred to as a “friction coefficient adjustment function surface”.

The friction coefficient adjusting surface may be made of any material as long as it hardly swells or dissolves in water or an aqueous solvent and can reduce the friction coefficient of the non-printing surface of the recording material. By providing such a friction coefficient adjusting function surface, it is possible to improve the drying property while securing good sheet feeding property and sheet passing property in the printing apparatus.

As a material constituting the friction coefficient adjusting surface, a water-insoluble resin is preferably used. Here, "water-insoluble" means that it hardly or not swells or dissolves in water or an aqueous solvent. For example, when a water-insoluble resin is immersed in water, the dissolution amount is 1% by weight or less, preferably 0.1% by weight.
5% by weight or less, and the swelling amount is 0.5% in terms of water absorption.
mg / cm ² or less, preferably 0.1 mg / cm ² or less. Examples of the water-insoluble resin include, for example, acrylic resin, styrene resin, polyester resin, polycarbonate resin, vinyl acetate resin, vinyl chloride resin, urethane resin, and the like, preferably, polymethyl methacrylate resin, polyester resin, polycarbonate resin, and vinyl chloride. Resins, urethane resins and the like. In addition, among the above-mentioned water-insoluble resins, it is preferable to use a resin that can secure the adhesiveness to the substrate in the recycling step, and examples of such a resin include a polycarbonate resin and a urethane resin. It is appropriate to use such a water-insoluble resin in an amount of 5 to 50 parts by weight, preferably 10 to 40 parts by weight, based on 100 parts by weight of the medium at the time of forming the layer.

The friction coefficient adjusting function surface may contain a reactive compound optionally contained in an intermediate adhesive layer described later. By including the reactive compound and having the same composition as that of the intermediate adhesive layer, simplicity in production such as application at a time during production is improved.

The friction coefficient adjusting surface may contain inorganic fine particles and / or organic fine particles. Examples of the inorganic fine particles include silica, titanium oxide, alumina, zinc oxide, and calcium carbonate. Examples of the organic fine particles include polyacrylic acid, polymethacrylic acid, polyethylene, and polyurethane. By including such fine particles, the friction coefficient of the non-printed surface can be further reduced, and the static friction coefficient can be controlled within the range described later. In particular, it has a remarkable effect in reducing the coefficient of friction in a high-temperature, high-humidity environment, and is more preferable because environmental stability is improved. The addition amount of such fine particles varies depending on the type and particle size of the fine particles, but cannot be unconditionally determined. However, 0.1 to 200 parts by weight relative to 100 parts by weight of the water-insoluble resin constituting the friction coefficient adjusting function surface. , Preferably 0.1 to 30 parts by weight.
If the value of the coefficient of static friction is within the range described later (along with the selection of the material and the like) from the beginning, it may not be added. Conversely, if the addition amount is too large, the dispersibility of the fine particles deteriorates, and uneven transferability and developability occur inside the sheet.

Further, from the viewpoint of the coating property when forming the friction coefficient adjusting function surface and the further improvement of the paper passing property of the obtained recording material, various surfactants similar to those on the surface layer are added to the friction coefficient adjusting function surface. Further, an antistatic agent may be added or applied. With respect to the addition amount of various surfactants and antistatic agents, the above ranges described in the description of the surface layer can be applied as the addition amounts per 100 parts by weight of the water-insoluble resin.

The friction coefficient adjusting surface composed of the water-insoluble resin and, if desired, a reactive compound and fine particles described below adjusts the friction coefficient of the non-printing surface of the recording material, more specifically, the static friction coefficient. Specifically, the non-printing surface of the recording material of the present invention on which the friction coefficient adjusting function surface is formed has a static friction coefficient of 0.2 to 0.7, preferably 0.1 to 0.7.
It is desirably 3 to 0.6. When the static friction coefficient of the non-printing surface exceeds 0.7, double feeding occurs in the printing device,
It is difficult to ensure good sheet feeding and sheet passing properties. On the other hand, if it is less than 0.2, the recording material cannot be sent out by the paper feed roller when feeding paper, and so-called misfeed occurs. Here, the static friction coefficient of the non-printed surface refers to a value measured according to JIS standard P8147 “Test method for friction coefficient of paper and paperboard”.

In the present invention, the static friction coefficient of the non-printed surface can be controlled within the above range by appropriately selecting the material of the friction coefficient adjusting function surface, that is, the type of resin and the type and amount of additive. it can. Further, in the present invention, the static friction coefficient of the non-printing surface can be controlled within the above range by changing the surface condition of the friction coefficient adjusting function surface. For details, generally when coated by a solvent coating method or a melt coating method as described below,
Since the unevenness occurs more than the surface state of the base material, the coefficient of friction is reduced. Although the details of the reason are unknown, it is considered to be caused by minute unevenness in application at the time of application and unevenness in evaporation of the solvent during drying and curing.

In order to coat the friction coefficient adjusting function surface 5 on the non-printing surface of the substrate, the water-insoluble resin and, if desired, the above-mentioned reactive compound and fine particles are coated with a suitable solvent such as tetrahydrofuran (THF), dioxane, acetone, or the like. It can be performed by a solvent coating method or a melt coating method of coating and drying a solution dissolved in ethyl acetate, methyl ethyl ketone (MEK) or the like. A solution in which a resin such as a water-soluble or hydrophilic polyurethane or polyester is dissolved or dispersed in water (which can be made water-insoluble by heating after coating and drying) can also be used. Such resin solutions and resin emulsions are commercially available, and when they are used,
There is an advantage that a coating film can be formed without using an organic solvent, especially a non-aqueous organic solvent. For this reason, safety at the time of manufacture can be improved. Further, it is possible to suppress a problem such as generation of gas of a residual solvent from the inside due to heating of the recording material due to paper passing through a copying machine or the like. When an aqueous solvent is used, the addition of a surfactant makes it easier to apply the friction coefficient adjusting surface. When the friction coefficient adjusting function surface and the surface layer are formed using an aqueous solvent, the recording material can be manufactured without using a non-aqueous organic solvent, and the safety and non-aqueous organic solvent in the recording material can be manufactured. The problem of the residual solvent can be prevented. By the solvent coating method or the melt coating method, a friction coefficient adjusting function surface is formed so that the film thickness is about 0.5 μm to 20 μm, preferably about 0.5 to 10 μm, and more preferably about 0.5 to 6 μm. . When the thickness is less than 0.5 μm, coating unevenness is likely to occur, and an uncoated portion tends to be formed. 2
If it exceeds 0 μm, problems may occur in the strength, heat resistance and the like of the recording material.

The reactive compound is a high molecular weight substance, has a film-forming property itself, has water-insolubility after drying, can reduce the coefficient of friction on the non-printed surface, and has an adhesive property with the substrate. As long as it is excellent, it can be formed by dissolving itself in a solvent or the like, coating and drying. Note that corona discharge treatment may be performed on the friction coefficient adjusting function surface.

In the recording material of the present invention, an intermediate adhesive layer may be formed between the substrate and the surface. The intermediate adhesive layer is provided for the purpose of bonding the surface layer more firmly to the substrate.
By providing the intermediate adhesive layer, the adhesiveness between the surface layer and the base material is improved, deterioration such as surface layer peeling can be suppressed, and the durability is improved.

FIG. 2 is a schematic sectional view of a recording material having an intermediate adhesive layer according to another embodiment of the present invention. 1 is a substrate, 2 is an intermediate adhesive layer, 3 is a surface layer, and 5 is a functional surface different from the water-swellable resin surface. FIG. 2 shows a configuration in which the printing material 4 is printed on the surface of the surface layer 3. The functional surface different from the base material, the surface layer, and the water-swellable resin surface is the same as that described with reference to FIG. 1, and only the intermediate adhesive layer will be described below. Hereinafter, a description will be given by taking a friction coefficient adjusting function surface as an example of a function surface different from the water swellable resin surface.

The intermediate adhesive layer 2 is made of a resin having a high adhesiveness. The intermediate adhesive layer contains a compound (reactive compound) having a functional group capable of chemically bonding to the resin constituting the surface layer, if desired. ing. By containing the reactive compound in this way, the adhesiveness and the bondability between the intermediate adhesive layer and the surface layer can be improved. Examples of the resin having high adhesiveness that forms the intermediate adhesive layer include the same resins as those described above as the water-insoluble resin that forms the friction coefficient adjusting function surface.

The reactive compound optionally contained in the intermediate adhesive layer is not particularly limited as long as it has a functional group capable of chemically bonding to the resin constituting the surface layer. Examples thereof include a methylol compound, an isocyanate compound and an aldehyde compound. , An epoxy compound, an aziridine compound and the like can be used. When the resin constituting the surface layer is a resin having a hydroxyl group such as polyvinyl alcohol or methyl cellulose, a methylol compound, an isocyanate compound,
Aldehyde compounds and epoxy compounds are preferred. When the resin constituting the surface layer is a resin having a carboxyl group such as polyacrylic acid, an isocyanate compound, an epoxy compound and an aziridine compound are preferred. In addition, as these compounds, the compounds exemplified as the crosslinking agent for the water-soluble resin constituting the surface layer surface can be exemplified in the same manner.

If desired, the reactive compound contained in the intermediate adhesive layer is preferably a solid or wax at room temperature or a viscous liquid at room temperature. If the reactive compound is solid or waxy at room temperature or a viscous liquid at room temperature, it does not evaporate due to drying during the formation of the intermediate adhesive layer, and after drying, the surface is not sticky, There is an advantage in that the handling of is easy. In addition, when a reactive compound that dissolves in water or has affinity for water is used, there is no need to use an organic solvent to apply and form the intermediate adhesive layer, and the organic solvent is contained in the intermediate adhesive layer. It can be prevented from remaining.

In the present invention, when the intermediate adhesive layer as described above is formed, it is preferable that the composition of the intermediate adhesive layer is the same as the composition of the friction coefficient adjusting function. This is because the necessity of preparing solutions for forming both layers is eliminated, thereby improving the manufacturability. Furthermore, when the composition of both layers is the same, the intermediate adhesive layer and the friction coefficient adjusting function surface can be simultaneously formed by immersing the base material in one coating solution, so that the productivity can be further improved. When a paper or fibrous base material is used, the base material is immersed in one coating solution, and the base material is impregnated with the coating solution. By filling the material that is the coefficient adjusting function surface material, the adhesiveness of the base material, the intermediate adhesive layer, and the friction coefficient adjusting function surface can be improved.

The intermediate adhesive layer 2 can be coated on the substrate 1 by a solvent coating method, a melt coating method, or the like, similarly to the method of forming the friction coefficient adjusting function surface. In the intermediate adhesive layer, as in the case of the friction coefficient adjusting function, a resin such as water-soluble or hydrophilic polyurethane or polyester dissolved or dispersed in water (to be made water-insoluble by heating after coating and drying) should be used. Can be. By using a resin solution or a resin emulsion using water as a solvent in this way, safety during manufacturing can be improved, and the recording material is heated from the inside by being heated when passing through a copying machine. Problems such as generation of residual solvent gas can be suppressed. When an aqueous solvent is used, the addition of a surfactant makes it easier to apply the intermediate adhesive layer. When the intermediate adhesive layer, the surface layer, and the friction coefficient adjusting surface are formed using an aqueous solvent, the recording material can be manufactured without using a non-aqueous organic solvent, and the recording medium can be used for safety and recording. The problem of the non-aqueous organic solvent remaining can be prevented. By the solvent coating method or the melt coating method, the film thickness is about 0.5 μm to 20 μm, preferably 0.5 to 10 μm.
The intermediate adhesive layer is formed to have a thickness of about μm, more preferably about 0.5 to 6 μm. When the thickness is less than 0.5 μm, coating unevenness is likely to occur, and an uncoated portion tends to be formed. If it exceeds 20 μm, problems may occur in the strength, heat resistance and the like of the recording material.

As long as the reactive compound contained in the intermediate adhesive layer is a high molecular weight substance, which itself has a film-forming property and is excellent in adhesiveness to a substrate, it is the same as in the friction coefficient adjusting function. Alternatively, it can be formed by dissolving itself in a solvent or the like, coating and drying. In the case of coating by adding to the resin solution, the amount of the reactive compound to be added depends on the amount of the resin 1 constituting the intermediate adhesive layer.
For example, 5 to 50 parts by weight with respect to 00 parts by weight.

The intermediate adhesive layer may be subjected to a corona discharge treatment.

Next, the curl prevention function will be described. Among the resins having a friction coefficient adjusting function surface configuration, a resin having a high hardness and a high elastic modulus is used, and a resin that is hard to curl, that is, a material that does not easily bend compared to the surface layer and the intermediate adhesive layer (particularly, the intermediate adhesive layer) is used. When the friction coefficient adjusting function surface is configured, the layer can also have a curl preventing function.

[0057] In particular, the friction coefficient adjustment function surface finally obtained, 300 kgf / cm ² or more as an elastic modulus, preferably 700 kgf / cm ² or more, more preferably 800
When it is configured to have a weight of not less than kgf / cm ^2, it can also have a curl prevention function. In this case, a functional surface different from the water-swellable resin surface may be referred to as a curl preventing functional surface. Having such characteristics is effective when an OHP sheet made of a polyethylene terephthalate resin which is currently commercially available is used as a base material.

Further, when the friction coefficient adjusting function surface is composed of a composition having a different elastic modulus from the intermediate adhesive layer,
It is preferable to form the friction coefficient adjusting function surface using a material having an elastic modulus higher than the elastic modulus of the film constituting the intermediate adhesive layer. By doing so, the friction coefficient adjusting function surface also functions as a surface for preventing curling (also referred to as a curl reducing function surface). Since it depends on the layer thickness, processing conditions, etc., it cannot be specified unconditionally, but as a guide,
The elastic modulus (100% modulus) of the friction coefficient adjusting function surface is about 50 to 5000 kgf / cm ² , preferably 10
0 to about 2000 kgf / cm ² , more preferably 3
It may be about 50 to 1000 kgf / cm ^{2 and} about 1 to 100 times, preferably 1 to 50 times, more preferably about 1 to 20 times the elastic modulus of the intermediate adhesive layer. However, the intermediate adhesive layer is configured to have an elastic modulus of at least about 20 kgf / cm ² . If the elastic modulus of the friction adjusting function layer is too small, it is difficult to achieve the effect of curl reduction. If the elastic modulus is too large, the flexibility of the recording material is lost, which is not preferable.

Further, not only the layer constituent material (composition) but also the film thickness is related to the curl reduction. The curl reducing effect is larger as the film thickness of the friction adjusting function layer is larger. Although it cannot be specified unconditionally, the friction adjusting functional layer has a thickness of 1 to 30 μm.
Degree, preferably 1 to 25 μm, more preferably 5 to 2 μm.
It may be about 0 μm, about 1 to 10 times, preferably about 1 to 3 times the intermediate adhesive layer. If the film thickness is too large, the flexibility of the recording material is lost, which is not preferable. On the other hand, if the film thickness is too thin, it is difficult to obtain the effect of curl reduction. It is important that the layer structure is formed such that the friction adjusting function layer is not easily deformed by itself and has an effect of suppressing curling of the recording material.

The recording material obtained as described above can be suitably used in a method for removing the recording material through a process of swelling the surface layer → physical rubbing by brushing or the like → drying process, and is recyclable. Further, the recording material of the present invention is excellent in paper feeding property and paper passing property, and also excellent in drying property. That is,
When a large number of recording materials of the present invention are set in a paper feed cassette by a copier / printer, or when they are left and stored in an overlapped state, the recording materials do not come into close contact with each other. It does not occur and there is no handling problem. Further, the recording material of the present invention can be dried with a small amount of energy.

Hereinafter, a method of removing a printing material from a recording material having a printing material such as toner printed on the surface thereof will be described. The method includes a step of supplying a recording material on which a printing material is printed to a solvent capable of swelling the surface layer, and scraping the recording material with a physical force from the swollen recording material surface. Hereinafter, a more detailed description will be given with reference to the drawings.

FIG. 3 is a process flow chart for explaining an example of a printing material removing method. In FIG. 3, the recording material 10
No. 0 has an intermediate adhesive layer and a surface layer formed on one surface (upper surface), and a functional surface different from the water-swellable resin surface is formed on the other surface (lower surface). Here, the intermediate adhesive layer and the surface layer are collectively denoted by 12, and the functional surface different from the water-swellable resin surface is denoted by 5. A printing material 4 such as toner is printed on the surface of the recording material. As the printing material, toner used in electrophotography is preferably used.In addition to these, thermal transfer methods, recording materials used in printing methods, and other recording materials such as oil-based paint agents A type that adheres to form a film-like image can be used. The recording material is conveyed from right to left in the drawing.

The recording material on which the printing material 4 has been printed is first supplied with a surface layer swelling solvent from the solvent supply device 11 to the surface layer. As the solvent capable of swelling the surface layer, various solvents such as an aqueous solvent, that is, water, a mixed solvent of water and a water-soluble organic solvent, or an aqueous organic solvent can be used. Also, a desired additive such as a surfactant may be added. As described above, the present embodiment has a great advantage in that the printing material can be removed using water. In the following description, the case where water is used will be described.

As shown in FIG. 3, the water may be supplied by showering water from the shower device 11 onto the surface layer, or immersed in water (not shown). It is preferable that the recording material is brought into contact with the water for about 15 seconds to about 150 seconds so that the water permeates into the surface layer. The longer the contact time, the more water can be permeated, but the longer the treatment. When water permeates the surface of the recording material, the surface swells (the swollen surface is shown as 13), and the adhesive force between the printing material 4 and the surface decreases. At this time, the water temperature is suitably about 15 ° C to 45 ° C. If the temperature is too high, the evaporation of water increases, and if the temperature is too low, a sufficient cleaning effect may not be obtained.

After the water has sufficiently penetrated into the surface layer of the recording material, the recording material is further transported to the printing material removal area, and the brush 1
Called 4 The brush 14 is rotating, and the printing material 4 on the recording material 100 is removed by the brush. In addition to the brush, a means of applying a physical or mechanical force to the surface to rub or scrape the surface, such as a blade or a cloth, may be employed. In FIG.
Although the brush 14 is arranged outside the liquid, it may be arranged in the liquid. The length of the bristles of the brush 14 can be about 5 to 20 mm, and the thickness can be about 10 to 60 μm. The material is not particularly limited, but nylon or the like is suitable.

The paper passing speed, that is, the recording material is the brush 14
May be determined in consideration of the balance between the processing time and the cleaning performance, for example, 0.5 cm /
Seconds to 5 cm / sec. The rotation speed of the brush is preferably 5 times or more, more preferably 10 times or more the transport speed.

After the printing material 4 is removed, the recording material is conveyed to a shower area, and a cleaning shower 15 is applied to the surface of the recording material to wash away the printing material remaining on the surface of the recording material. As the liquid used for the shower 15, the same aqueous solvent as used for swelling the surface layer can be used. The same solvent as used to swell the surface may be used. It is particularly preferred to use water.

After the shower 15 is applied, the recording material is further conveyed to a drying area and dried by the dryer 16.
The drying method may be a contact type such as a heat roller or a non-contact type such as a far-infrared lamp. The heating temperature is suitably about 70 to 150 ° C.

FIG. 4 is a diagram showing an embodiment of a cleaning device to which the above-described cleaning method can be applied.
The apparatus shown in FIG. 4 includes a cleaning tank 22 for storing a liquid 30 for swelling a recording material in a casing 23. The cleaning tank 22 is connected to a pump 20 having a filter for removing printing material in the liquid in the tank, and the pump 20 is further provided with a swelling shower 11 and a rinsing shower 15 via a pipe 31. It is connected.

The liquid in the cleaning tank 22 is
After being purified by the internal filter, it is sent to showers 11 and 15 through a pipe 31, and is used as a liquid for swelling the recording material in the shower 11 and as a rinsing liquid in the shower 15.

The recording material is introduced into the apparatus by a paper feed roller 21, and is sprayed with a swelling liquid by a shower 11, then passes through a guide 26 and a transport roller 24 and is immersed in a liquid 30 in a cleaning tank 22. You. And
After standing still for a predetermined time, the conveying roller 24 and the guide 28
Is sent to the opposite portion of the brush 14 to remove the printing material.

Thereafter, the recording material passes through the guide 29, the transport roller 25, and the guide 27, is sprayed with a rinsing liquid by the shower 15, is finally dried by the drying roller 17, and is discharged out of the apparatus.

Hereinafter, the present invention will be described with reference to examples. First, examples and comparative examples in which a functional surface different from the water-swellable resin surface is improved and evaluated from the viewpoint of a friction coefficient adjusting function will be described.

[0074]

Example 1 Base material: A polyethylene terephthalate (PET) sheet having a thickness of 100 μm was used as a base material. -Intermediate adhesive layer and friction coefficient adjusting function surface: 100 g of water-dispersible urethane resin solution (HUX-232, manufactured by Asahi Denka Co., Ltd.)
5 g of a melamine-formaldehyde resin (Sumiraze 613: manufactured by Sumitomo Chemical Co., Ltd.) and 0.1 g of polyoxyethylene nonyl phenyl ether were added to (solid content 30%).
The mixed solution was stirred for 5 minutes to obtain a resin solution 1 for forming the intermediate adhesive layer and the friction coefficient adjusting function surface. The above resin solution was applied to both surfaces of the substrate with a bar coater, dried at 120 ° C. for 5 minutes, and further subjected to corona discharge treatment to a thickness of 5 μm.
To obtain an intermediate adhesive layer (printing surface) and a friction coefficient adjusting function surface (non-printing surface). Surface layer: 16 g of anion-modified polyvinyl alcohol KL-318 (manufactured by Kuraray Co., Ltd.) as water-soluble resin and 184 of water
g) to prepare a resin solution. An epoxy-based crosslinking agent (Denacol EX-313, manufactured by Nagase Kasei Co., Ltd.) is added to the resin solution.
3.2 g, polyoxyethylene nonyl phenyl ether 0.4 g, and silica fine particles (Sylysia 450, manufactured by Fuji Silysia Ltd.) 1 g were added and stirred for 15 minutes to obtain a resin solution 2 for a surface layer. The obtained liquid was applied only on the printing surface (on the intermediate adhesive layer) with a bar coater, and heated at 120 ° C. for 2 hours to obtain a surface layer having a thickness of 9 μm. The sheet thus obtained was named sheet 1. The coefficient of static friction of the non-printed surface was 0.58.

Example 2 Substrate: A polyethylene terephthalate (PET) sheet having a thickness of 100 μm was used as the substrate. -Friction coefficient adjusting function; water-dispersible urethane resin solution (H
UX-232, manufactured by Asahi Denka Co., Ltd.) 100 g (solid content 30%)
Melamine-formaldehyde resin (SUMIREZ 61
3: Sumitomo Chemical Co., Ltd.) and 0.1 g of polyoxyethylene nonylphenyl ether. The mixture was stirred for 5 minutes to obtain a resin solution 1 having a friction coefficient adjusting function. The above-mentioned resin solution is applied to one surface of the substrate with a bar coater, dried at 120 ° C. for 5 minutes, and further subjected to a corona discharge treatment to obtain a 5 μm-thick friction coefficient adjusting surface (non-printing surface). ) Got. Surface: Resin solution 2 for the surface was obtained in exactly the same manner as in Example 1. The obtained liquid was applied only to the printing surface (on the base material) using a bar coater, and heated at 120 ° C. for 2 hours to obtain a thickness of 9 μm.
m was obtained. The sheet thus obtained was designated as sheet 2. The coefficient of static friction of the non-printed surface was 0.58 as in Example 1.

Example 3 Substrate: A polyethylene terephthalate (PET) sheet having a thickness of 100 μm was used as a substrate. Intermediate adhesive layer and friction coefficient adjusting function surface: The intermediate adhesive layer was formed using the resin solution 1 for forming the intermediate adhesive layer used in Example 1 as it was. For the friction coefficient adjusting function, a resin solution was prepared by dissolving 14 g of a polycarbonate resin in 86 g of 1,4-dioxane. To the resin solution was added 1 g of a melamine-formaldehyde resin (Sumilez 613: manufactured by Sumitomo Chemical Co., Ltd.), and the mixture was stirred to obtain a resin solution 3 for constituting a friction coefficient adjusting function surface. The above resin solution 1 and resin solution 3
Is applied to the substrate one side at a time using a bar coater.
Heat for 5 minutes, and then perform corona discharge treatment to a thickness of 5μ.
Thus, an intermediate adhesive layer (printed surface) and a friction coefficient adjusting function surface (non-printed surface) were obtained. Surface layer: 16 g of anion-modified polyvinyl alcohol KL-318 (manufactured by Kuraray Co., Ltd.) as water-soluble resin and 184 of water
g) to prepare a resin solution. An epoxy-based crosslinking agent (Denacol EX-313, manufactured by Nagase Kasei Co., Ltd.) is added to the resin solution.
0.8 g, 0.4 g of polyoxyethylene nonylphenyl ether, and 1 g of silica fine particles (Sylysia 450, manufactured by Fuji Silysia Ltd.) were added thereto, followed by stirring for 15 minutes to obtain a resin solution 4 for a surface layer. The obtained liquid was applied only on the printing surface (on the intermediate adhesive layer) with a bar coater, and heated at 120 ° C. for 2 hours to obtain a surface layer having a thickness of 9 μm. The sheet thus obtained was named sheet 3. The coefficient of static friction of the non-printed surface was 0.62.

Example 4 100 g of a water-dispersible urethane resin solution (HUX-232, manufactured by Asahi Denka Co., Ltd.), 5 g of a melamine-formaldehyde resin (Sumirase 613: manufactured by Sumitomo Chemical Co., Ltd.), 0.1 g of polyoxyethylene nonylphenyl ether, and 0.1 g of polyoxyethylene nonylphenyl ether 0.2 g of silica fine particles (Sylysia 450, manufactured by Fuji Silysia)
Was added. The mixed solution was stirred for 5 minutes to obtain a resin solution 5 for constituting a friction coefficient adjusting function surface. A sheet was prepared in the same manner as in Example 1 except that the resin solution 5 was applied to one surface (non-printing surface) of the base material to obtain a surface having a function of adjusting a friction coefficient. And The coefficient of static friction of the non-printed surface was 0.49.

Comparative Example 1 A sheet 5 was obtained in exactly the same composition and method as in Example 1 except that a sheet was prepared without applying the friction coefficient adjusting function surface. The coefficient of static friction of the non-printed surface was 0.82.

Comparative Example 2 The steps up to the formation of the intermediate adhesive layer and the friction coefficient adjusting function surface were made by the exactly same composition and method as in Example 1.
The surface layer was coated on both sides with a bar coater using the resin solution 2 and heated at 120 ° C. for 2 hours to obtain a surface layer having a surface thickness of 9 μm. The sheet thus obtained was used as sheet 6. The coefficient of static friction of the non-printed surface was 0.61.

Evaluation Evaluation of paper feedability Commercial full-color copying machine (CF900; manufactured by Minolta)
, And 100 sheets were set on a paper feed stacker to form an image. The process was continued until all sheets were used, and the number of double feeds that occurred until the end was counted.
◎ No double feed occurred once, 5 double feeds
The sample that was less than the number of times was evaluated as ○, and the sample that was double-fed 5 times or more was evaluated as ×, and 以上 or more was evaluated as acceptable.

Evaluation of Drying Property Each of the sheets 1 to 6 was subjected to the same step as the image removing step using the apparatus shown in FIG. 4 to sufficiently impregnate each sheet with water. Thereafter, the sheet was passed through the drying roller 17 as usual. The temperature of the drying roller was set at 110 ° C,
The paper passing speed was 1 cm / sec. The amount of water remaining after drying was measured for each sheet, and 0.15 mg
/ Cm ² /0.15 mg / cm ² or more.
Those with less than 3 mg / cm ² were rated as ○, those with 0.3 mg / cm ² or more as ×, and those with 以上 or more were accepted. The water content was determined as in the following equation. Moisture content (mg / cm ² ) = (weight of sheet after passing through drying roller−dry weight of sheet) / surface area of sheet The “dry weight of sheet” means that each sheet was left in a dryer at 100 ° C. for 3 minutes. The latter weight was adopted.

Evaluation of light transmittance The parallel transmittance of each of the sheets 1 to 6 was measured using a turbidimeter (cloudiness meter) ND.
It measured using H2000 TURBIDIMETER (made by Nippon Denshoku Industries Co., Ltd.). The parallel transmittance is defined as a value obtained by subtracting a component reflected on the front surface, a component absorbed inside, and a component transmitted but scattered on the back surface from all rays when a light beam is applied to the sheet. %, The higher the transparency of the sheet, the better the properties as an OHP sheet. The parallel transmittance of polyethylene terephthalate alone as a substrate used for reference was 85.75%.

[0083]

[Table 1]

Next, Examples and Comparative Examples in which a functional surface different from the water-swellable resin surface is evaluated for improvement from the viewpoint of the curl prevention function will be described.

Example 5 Substrate: A polyethylene terephthalate (PET) sheet having a thickness of 100 μm was used as a substrate. -Intermediate adhesive layer; water-dispersible urethane resin solution (HUX-2
To 100 g of 90H, manufactured by Asahi Denka Co., Ltd., 20 g of melamine-formaldehyde resin (HUX-11W, manufactured by Asahi Denka Co., Ltd.) and 2 g of polyoxyethylene nonylphenyl ether were added. The mixed solution was stirred for 5 minutes to obtain a resin solution 6 for forming an intermediate layer. The resin solution described above was applied to the printing surface of the base material using a bar coater, and dried at 150 ° C. for 15 minutes to obtain an intermediate adhesive layer having a thickness of 8 μm.・ Curl reducing layer; water-dispersible urethane resin solution (HUX-
232, manufactured by Asahi Denka Co., Ltd.) and 5 g of melamine-formaldehyde resin (SUMIREZ 613: manufactured by Sumitomo Chemical Co., Ltd.) and 2 g of polyoxyethylene nonylphenyl ether were added. The mixed solution was stirred for 5 minutes to obtain a resin solution 7 for forming a curl reduction layer. The curl-reducing layer resin solution described above was applied to the non-printed surface of the substrate with a bar coater and dried at 120 ° C. for 5 minutes to obtain a curl reducing layer having a thickness of 14 μm. Surface: 16 g of anion-modified polyvinyl alcohol KL-318 (manufactured by Kuraray) as a water-soluble resin and 184 g of water
To prepare a resin solution. An epoxy-based crosslinking agent (Denacol EX-313, manufactured by Nagase Kasei Co., Ltd.) is added to the resin solution.
3.2 g, polyoxyethylene nonylphenyl ether 0.4 g, and silica fine particles (Sylysia 450, manufactured by Fuji Silysia Ltd.) 1 g were added and stirred for 15 minutes to obtain a resin solution 8 for a surface layer. The obtained liquid was applied only to the printing surface (on the intermediate adhesive layer) with a bar coater, and heated at 120 ° C. for 2 hours to obtain a surface layer having a thickness of 9 μm. The sheet thus obtained was used as sheet 7.

Example 6 Substrate: A polyethylene terephthalate (PET) sheet having a thickness of 100 μm was used as a substrate. -Intermediate adhesive layer; water-dispersible urethane resin solution (HUX-2
90H, manufactured by Asahi Denka Co., Ltd.) and 2 g of polyoxyethylene nonylphenyl ether were added to 100 g. The mixed solution was stirred for 5 minutes to obtain a resin solution 9 for forming an intermediate layer. The above resin solution was applied to the printing surface of the substrate with a bar coater,
C. for 15 minutes to obtain an intermediate adhesive layer having a thickness of 16 .mu.m. Curl reduction layer: A curl reduction layer was formed using the resin solution 6 for forming the intermediate adhesive layer used in Example 5 as it was.
The resin solution described above was applied to the non-printing surface of the substrate with a bar coater and dried at 150 ° C. for 15 minutes to obtain a curl reducing layer having a thickness of 16 μm. Surface layer: Resin solution 8 for surface layer in exactly the same manner as in Example 5.
I got The obtained liquid was applied only to the printing surface (on the intermediate adhesive layer) with a bar coater, and heated at 120 ° C. for 2 hours to obtain a thickness of 9
A μm surface layer was obtained. The sheet thus obtained was designated as sheet 8.

Example 7 Substrate: A polyethylene terephthalate (PET) sheet having a thickness of 100 μm was used as a substrate. The printed surface was subjected to a corona discharge treatment for the purpose of improving the adhesion to the surface layer. Curl reduction layer: A curl reduction layer was formed using the resin solution 7 for forming the curl reduction layer used in Example 5 as it was. The resin solution described above was applied to the non-printing surface of the substrate with a bar coater, and dried at 120 ° C. for 5 minutes to obtain a curl reducing layer having a thickness of 5 μm. Surface: 16 g of anion-modified polyvinyl alcohol KL-318 (manufactured by Kuraray) as a water-soluble resin and 184 g of water
To prepare a resin solution. An epoxy-based crosslinking agent (Denacol EX-313, manufactured by Nagase Kasei Co., Ltd.) is added to the resin solution.
0.8 g, 0.4 g of polyoxyethylene nonylphenyl ether, and 1 g of silica fine particles (Sylysia 450, manufactured by Fuji Silysia Ltd.) were added thereto, followed by stirring for 15 minutes to obtain a resin solution 10 for a surface layer. The obtained liquid was applied only to the printing surface with a bar coater,
C. for 2 hours to obtain a surface layer having a thickness of 9 .mu.m. The sheet thus obtained was designated as sheet 9.

Example 8 Substrate: A polyethylene terephthalate (PET) sheet having a thickness of 100 μm was used as a substrate. Intermediate adhesive layer and curl reducing layer: The intermediate adhesive layer and curl reducing layer were formed using the resin solution 6 for forming the intermediate adhesive layer used in Example 5 as it was. The above resin solution was applied to the printing surface of the substrate with a bar coater,
After drying for 15 minutes, an intermediate adhesive layer having a thickness of 8 μm was obtained. Similarly, a non-printed surface of the substrate is coated with a bar coater,
C. for 15 minutes to obtain an intermediate adhesive layer having a thickness of 20 .mu.m. Surface layer: Resin solution 8 for surface layer in exactly the same manner as in Example 5.
I got The obtained liquid was applied only to the printing surface (intermediate adhesive layer) with a bar coater, and heated at 120 ° C. for 2 hours to obtain a surface layer having a thickness of 9 μm. The sheet thus obtained was named sheet 10.

Comparative Example 3 Substrate: A polyethylene terephthalate (PET) sheet having a thickness of 100 μm was used as the substrate. Intermediate adhesive layer and curl reducing layer: The intermediate adhesive layer and curl reducing layer were formed using the resin solution 6 for forming the intermediate adhesive layer used in Example 5 as it was. The above resin solution was applied to both sides of the substrate with a bar coater,
After drying for 5 minutes, an intermediate adhesive layer and a curl reducing layer having a thickness of 8 μm were obtained. Surface layer: Resin solution 8 for surface layer in exactly the same manner as in Example 5.
I got The obtained liquid was applied only to the printing surface (intermediate adhesive layer) with a bar coater, and heated at 120 ° C. for 2 hours to obtain a surface layer having a thickness of 9 μm. The sheet thus obtained was used as sheet 11.

Comparative Example 4 Substrate: A polyethylene terephthalate (PET) sheet having a thickness of 100 μm was used as a substrate. Intermediate adhesive layer: An intermediate adhesive layer was formed using the resin solution 7 for forming the curl reducing layer used in Example 5 as it was. The above resin solution was applied to the printing surface of the base material using a bar coater, and dried at 120 ° C. for 5 minutes to obtain an intermediate adhesive layer having a thickness of 14 μm. Curl reduction layer: A curl reduction layer was formed using the resin solution 6 for forming the intermediate adhesive layer used in Example 5 as it was.
The above-mentioned resin solution was applied to the non-printing surface of the substrate with a bar coater, and dried at 150 ° C. for 15 minutes to obtain a curl reducing layer having a thickness of 8 μm. Surface layer: Resin solution 8 for surface layer in exactly the same manner as in Example 5.
I got The obtained liquid was applied only to the printing surface (intermediate adhesive layer) with a bar coater, and heated at 120 ° C. for 2 hours to obtain a surface layer having a thickness of 9 μm. The sheet thus obtained was designated as sheet 12.

Comparative Example 5 A surface layer and an intermediate layer were formed in exactly the same manner as in Example 5 except that the curl reducing layer was not provided. The sheet thus obtained was used as sheet 13.

Comparative Example 6 In the same manner as in Example 5, a surface layer and an intermediate layer were formed exactly on both surfaces of the substrate. The sheet thus obtained was designated as sheet 14.

Table 2 shows the thickness and the elastic modulus of the intermediate layer and the curl reducing layer of the obtained sheet. The thickness of each layer was calculated from the difference in weight before and after coating (assuming the specific gravity was 1).

Evaluation Evaluation of Paper Passability Each sheet was subjected to the same steps as the image removing step using the apparatus shown in FIG. 3, and each sheet was sufficiently impregnated with water. Thereafter, the sheet was passed through the drying roller 17 as usual.
In addition, the temperature of the drying roller was set to 110 ° C., and the paper passing speed was 1 cm / sec. Using a commercially available full-color copying machine (CF900; manufactured by Minolta Co., Ltd.), 100 dried sheets were set on a paper feed stacker to form an image. The process was continued until all sheets were used, and the number of misfeeds that occurred until the end was counted. A sample in which no misfeed occurred at all was evaluated as ◎, a sample in which the number of misfeeds was less than 5 times was evaluated as ○, and a sample in which misfeed was performed 5 times or more was evaluated as ×, and 以上 or more was evaluated as acceptable.

Evaluation of Drying Property Each sheet was subjected to the same steps as the image removing step using the apparatus shown in FIG. 3, and each sheet was sufficiently impregnated with water. Thereafter, the sheet was passed through the drying roller 17 as usual.
In addition, the temperature of the drying roller was set to 110 ° C., and the paper passing speed was 1 cm / sec. The amount of water remaining after drying in each sheet was measured, and those having less than 0.15 mg / cm ² were evaluated as ◎, and 0.15 mg / cm ² or more and 0.3 mg / cm ^2.
Less than O was evaluated as O, 0.3 mg / cm ² or more as X, and O or more was accepted. The water content was determined as in the following equation. Moisture content (mg / cm ² ) = (weight of sheet after passing through drying roller−dry weight of sheet) / surface area of sheet The dry weight of the sheet is obtained by leaving each sheet in a dryer at 100 ° C. for 3 minutes. Adopted weight.

Measurement of Elastic Modulus The elastic moduli of the intermediate layer and the curl reducing layer used in each of the examples and comparative examples were measured and are shown in the table. The resin solution constituting each layer is applied and dried on a sheet having good releasability such as a fluororesin in the same manner and thickness as in the embodiment, and then the layer is peeled off to form a thin film composed of a single substance. Was prepared and measured. The elastic modulus was measured using a sheet-shaped sample having a length of 20 mm and a width of 10 mm and applying a tensile strain using a viscoelasticity measuring device DMS6100 (manufactured by Seiko Instruments Inc.). The measurement conditions were as follows: at 25 ° C., a forced strain of 1 Hz and a strain of 10 μm was applied, and the value of the storage elastic modulus E ′ at that time (unit:
MPa).

There are various methods for measuring the elastic modulus.
The value may slightly change depending on the method, but in the present invention, it is sufficient if the magnitude relationship between the printed surface and the non-printed surface becomes clear, and the method is not particularly limited.
For example, the reference document “Evaluation method and control of stiffness of coated paper” (Paper Engineering Co., Ltd., 51 (4): 635-644 (1997)) states that Young's A method is disclosed in which a material whose modulus is to be measured is applied to prepare a sample, the Clark stiffness is measured, and the Young's modulus of the coating layer is converted. In the above method, the Young's modulus of the coating layer, that is, the intermediate layer and the curl reduction layer, can be measured without peeling the layers. Even when the evaluation is performed using the elastic modulus measured by such a method, this magnitude relationship does not change and can be used as a physical property value for achieving the effect of the present invention.

Curling Measurement Each sheet was subjected to the same steps as the image removing step using the apparatus shown in FIG. 3, and each sheet was sufficiently impregnated with water. Thereafter, the sheet was passed through the drying roller 17 as usual.
In addition, the temperature of the drying roller was set to 110 ° C., and the paper passing speed was 1 cm / sec. Place each of the obtained sheets on a horizontal, highly flat desk or the like with the four corners of the sheet floating, that is, with the lower part protruding, and use a ruler to determine how much each of the four corners is floating from the surface of the desk. Measure.
The measurements at these four points were averaged, the unit was expressed as mm, and the degree of curl was defined.

The results are shown in Table 2.

[Table 2]

[0100]

According to the recording material of the present invention, by providing a non-printing surface with a functional surface different from the water-swellable resin surface,
It is possible to obtain an excellent effect that it is possible to improve the drying property of the recording material while securing a good paper feeding property and a good paper passing property in the printing apparatus. Also, compared to a recording material having a surface layer on both sides (Comparative Example 2), the recording material proposed in the present invention has a higher parallel transmittance value and has more preferable characteristics as an OHP sheet. You can see that.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an embodiment of a recording material.

FIG. 2 is a schematic sectional view showing another embodiment of the recording material.

FIG. 3 is a process flow chart for explaining a method for removing a recording material.

FIG. 4 is a diagram illustrating an example of a cleaning device.

[Description of Signs] 1: Base material, 2: Intermediate adhesive layer, 3: Surface layer, 4: Printing material, 5: Functional surface different from water swellable resin surface, 11: Shower device, 12: Intermediate adhesive layer + Surface layer, 13: swollen surface layer, 14: brush, 15: cleaning shower,
16: dryer, 100: recording material.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Naoki Yoshie 2-3-113 Azuchicho, Chuo-ku, Osaka-shi, Osaka Inside the Osaka International Building Minolta Co., Ltd.

Claims (7)

[Claims] Claims: 1. A substrate having a water-swellable resin surface on the surface side of a substrate,
A recyclable recording material having a functional surface different from the water-swellable resin surface on the back side of the substrate. 2. The recording material according to claim 1, wherein the functional surface different from the water-swellable resin surface is a surface for adjusting a friction coefficient. 3. The recording material according to claim 2, wherein an intermediate adhesive layer is provided between the base material and the water-swellable resin. 4. The recording material according to claim 3, wherein the functional surface different from the water-swellable resin surface has the same composition as the intermediate adhesive layer. 5. The recording material according to claim 1, wherein the functional surface different from the water-swellable resin surface is a surface for reducing curling of the recording material. 6. The recording material according to claim 5, wherein an intermediate adhesive layer is provided between the substrate and the water-swellable resin. 7. The recording material according to claim 6, wherein the elastic modulus of the functional surface different from the water-swellable resin surface is higher than the elastic modulus of the intermediate adhesive layer.