JP2001109383A - Image recording tacky adhesive sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image recording tacky adhesive sheet which is commonly usable for many kinds of recording systems including an electrophotographic system, ink jet system and heat transfer system, etc., prevents double feeding and idle feeding, suppresses curling and allows recording of bright images on its surface. SOLUTION: This tacky adhesive sheet is formed by successively laminating a paper base material, a tacky adhesive layer and a release material, specifying the loading material pigments in the paper base material to 10 to 30 wt.%, applying a surface treating agent containing a quaternary ammonium salt on its surface or impregnating the surface with the agent to regulate its smoothness to 30 to 200 seconds and specifying the air permeability of the release material to 500 to 20,000 seconds.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image recording pressure-sensitive adhesive sheet capable of recording an image on its surface by any of various recording methods such as an electrophotographic method, an ink jet method and a thermal transfer method.

[0002]

2. Description of the Related Art In recent years, various types of recording systems have been put into practical use, and the use of them to record images on the surface of an image recording adhesive sheet has been increasing. For example, a large number of address labels printed by an electrophotographic method, adhesive sheets on which an original color image is recorded by any of an electrophotographic method, an ink jet method, and a thermal transfer method are produced. Conventionally, as a pressure-sensitive adhesive sheet for image recording, a paper base material, a pressure-sensitive adhesive layer and a release material are laminated in order, and those having different configurations according to the recording method are used. No one that can handle the recording method has been obtained. For example, an image recording adhesive sheet used in an electrophotographic system such as a copying machine or a laser printer may have an unstable curl under environmental conditions before recording, or may have a curl due to a heat treatment performed to fix the toner. If it occurs and the degree of curl is large, a so-called paper jam may occur in the machine. As a means to eliminate curl,
It has been proposed to reduce the curl of adhesive paper by using the same base paper as the base paper used for the paper base and the base paper used for the release paper, or by adjusting the dimensional change (Japanese Utility Model Publication No. 60-26105, Japanese Patent Publication No. 3-52509) has a problem that it is not sufficiently practical when used for other recording methods. In recording methods such as the ink jet method and the thermal transfer method, there are problems such as ink bleeding in the ink jet method and blurring of printing in the heat transfer method.To solve these problems, in order to improve printability on a paper base material, It has been practiced to apply a print receiving coat. When an adhesive sheet having this print receiving coat is used in an electrophotographic printer, a problem of double feeding in which two sheets are fed together in the printer due to a change in the friction coefficient of the surface due to the coat, and a paper feed rubber roll However, there is a problem that the paper slips due to slippage and the like, causing troubles such as idle feeding in which paper feeding cannot be performed, and curling resistance is reduced. Under such circumstances, there has been a demand for an adhesive sheet for image recording which is excellent in practicality and can be shared by various types of recording systems. ,

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the state of the prior art described above,
To provide an image recording pressure-sensitive adhesive sheet that can be used in many types of recording methods such as an ink jet method and a thermal transfer method, can prevent double feed and empty feed, suppress curl, and record a clear image on the surface. Aim.

[0004]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, a filler was contained in a paper base material in an amount of 10 to 30% by weight, and the surface thereof was quaternary ammonium. Coating or impregnating with a surface treatment solution containing salt to make the smoothness 30 to 200 seconds and the air permeability of the release material 500 to 20
2,000 seconds can reduce the curl of the adhesive sheet in each environment in the electrophotographic method and the curl of the adhesive sheet when heated in the printer, and can reduce the blur of printing in the ink jet method and reduce the heat transfer. It has been found that the ink ribbon transfer failure in the system can be reduced, troubles in double feeding and empty feeding can be reduced, and that the present invention can be applied to various types of recording systems. Based on this finding, the present invention has been completed.

That is, according to the present invention, a paper base material, an adhesive layer and a release material are laminated in this order, and the paper base material contains one filler.
0 to 30% by weight, the surface of which is coated or impregnated with a surface treatment liquid containing a quaternary ammonium salt to have a smoothness of 3%.
0-200 seconds, the air permeability of the release material is 500-
An object of the present invention is to provide a pressure-sensitive adhesive sheet for image recording, wherein the time is 20,000 seconds. The present invention also provides the pressure-sensitive adhesive sheet for image recording, wherein the release material is provided with a sealing layer having a thickness of 3 μm or less on the surface of the release material base paper, and further provided with a release agent layer on the surface. It is intended to provide an adhesive sheet for image recording. Hereinafter, the present invention will be described in detail.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, as a pulp as a raw material constituting a paper base material, generally used LBK is used.
Virgin pulp such as P and NBKP, recovered high-quality used paper, used newspaper, and the like can be used, but those containing used paper are preferable from the viewpoint of recycling. Paper base material is 10 ~
It consists of paper containing 30% by weight, preferably 15 to 25% by weight. If the amount of the filler exceeds 30% by weight, it is not preferable because the coefficient of friction of the surface is reduced, the filler is dropped off during letterpress printing or offset printing using the UV curable ink and migrates into the ink, causing poor printing. 10% by weight
If the amount is less than the above, good printing suitability in the ink jet system or the thermal transfer system cannot be obtained. Examples of the filler include various inorganic fillers such as talc, clay, calcium carbonate, silica, and zeolite (natural or synthetic zeolite). Calcium carbonate, zeolite, and silica are preferred in terms of inkjet printability (ink absorption). preferable. More preferably, in a thermal transfer printing method using calcium carbonate or zeolite as a printing method, the transferability of the recording material ribbon is effective, and good image quality can be obtained. These two types of fillers are also particularly preferable in terms of a coefficient of friction with a paper feeding member in an electrophotographic printer.

[0007] As a preferred method for producing a paper base material, pulp is charged, the beating degree is preferably adjusted in the range of 20 to 50 ° SR with a shopper / Rigler freeness, and a filler and various papermaking chemicals are added. Using this paper stock, a paper machine preferably has a rice tsubo of 30 to 150 g / m ² , a thickness of preferably 30 to 180 μm, a water content of preferably 3 to 7 wt%, and a Beck smoothness of preferably 30 to 150 g / m ² . There is a method of manufacturing so as to be 200 seconds. The sizing agent can be added either internally or externally as needed.

The surface of the paper substrate is coated or impregnated with a surface treatment liquid containing a quaternary ammonium salt, and has a smoothness of 30 to 200 seconds, preferably 50 to 150 seconds.
If the smoothness is less than 30 seconds, the ink ribbon cannot be sufficiently transferred during thermal transfer printing, and printing defects such as white spots are likely to occur. On the other hand, if the smoothness exceeds 200 seconds, depending on the printer, a slip occurs on a paper feed roll or the like, which causes a paper feed failure. Smoothness is 50 ~
In the preferable range of 150 seconds, both the thermal transfer printing property and the paper feeding property of the printer are the most excellent. Examples of the quaternary ammonium salt include various quaternary ammonium salts,
For example, a quaternary comprising a combination of an alkyl group having 5 to 25 carbon atoms, an alkenyl group or an alkylamidoalkyl group, an alkyl group having 1 to 4 carbon atoms, an aromatic group having 6 to 10 carbon atoms, or an aromatic alkyl group. Ammonium salts, one of an alkyl group, an alkenyl group or an alkylamidoalkyl group having 5 to 25 carbon atoms;
A quaternary ammonium salt having two or more alkyl groups of 4 to 4 is preferable. The atom or atomic group of the anion constituting the salt of the quaternary ammonium salt is not particularly limited, and examples thereof include a chlorine atom and a sulfate group. Suitable specific examples of the quaternary ammonium salt include, for example, lauryltrimethylammonium chloride, lauryldimethyl (benzyl) ammonium (meth) sulfate, and a sapamin-type quaternary ammonium salt.

The surface treatment solution containing a quaternary ammonium salt can be contained in a binder, and a common water-soluble binder such as polyvinyl alcohol or starch can be used as the binder. The amount of the quaternary ammonium salt applied or impregnated can exert its effect even in a very small amount, but is preferably in the range of 0.01 to 3 g / m ^{2 by} weight after drying. The application or impregnation with the surface treatment liquid containing a quaternary ammonium salt can be performed on one side (opposite the side on which the adhesive layer is laminated) or both sides of the paper substrate. In addition, the coating or impregnation with a surface treatment solution containing a quaternary ammonium salt is performed by using a coater on a size press or a paper machine in the above-described paper base manufacturing process, or after paper making, separately applying a paper coater or the like to the paper base. Performed on the surface.

The release material used in the present invention has a release material layer provided on the surface of a release material base paper. The release material used in the present invention has an air permeability of 500 to 20,000 seconds, preferably 1,000 to 18,000 seconds, and more preferably 3,000 to 10,000 seconds. If the air permeability of the release material is less than 500 seconds, penetration of the coated release agent is rapid, resulting in strike-through, dirt of the coating machine, change in the friction coefficient on the back surface, and the performance of releasing the pressure-sensitive adhesive as a release material is reduced. .
On the other hand, when the air permeability exceeds 20,000 seconds, the coating property of the release agent and the release property of the pressure-sensitive adhesive are good, but the curl due to the heat for fixing the print increases. In addition, the wear coefficient is reduced, and depending on the printer, slippage occurs with the sheet feeding member, causing many problems such as paper jam in the printer. The release material base paper uses the same pulp as the paper base material and has a beating degree of 35.
It is preferably adjusted to a range of 45 ° SR, and the difference from the beating degree of the paper substrate is preferably 15 ° SR or less, and more preferably 10 ° SR or less from the viewpoint of preventing curling as an adhesive sheet. More preferred. Further, the release material base paper preferably has a rice tsubo of 30 to 150 g / m ² , and the surface of the release material preferably has a smoothness of 30 to 200 seconds. The release material base paper can be manufactured by making paper in the same manner as the paper base material. A filler can also be included in the release material base paper. As the filler, it is preferable to add various inorganic fillers similar to the filler contained in the above-mentioned paper base material in a content of 10% by weight or less. If it exceeds 10% by weight, the air permeability of the release material is 50%.
It easily takes less than 0 seconds, which adversely affects the suitability for release agent coating.

The release material is preferably prepared by providing a filler layer having a thickness of 3 μm or less, preferably 2 μm or less on a release material base paper, and treating the surface of the filler layer with a release agent. If the filling layer exceeds 3 μm, curling properties, particularly curling due to fixing heat at the time of printing, increase, which is not preferable. In order to provide a filler layer on the release material base paper, a filler can be applied to the surface of the release material base paper by means such as coating. The filler is made of a water-soluble polymer such as polyvinyl alcohol or starch, or a resin such as styrene butadiene rubber resin, acrylic resin, polyester resin, or polyethylene resin, and if necessary, a filler such as clay or talc. For example, polyvinyl alcohol, starch and the like, which can be easily disintegrated, are preferable from the viewpoint of converting the release material into recycled paper and having a sealing effect. The filler layer can be provided on one side (the side on which the release agent layer is formed) or on both sides of the release material base paper. Various release agents can be used as the release agent used in the release agent layer, and a silicone resin-based release agent is preferable. The release agent layer can be formed by a known surface treatment method such as Meyer bar coating or gravure printing, and can be cured by heat drying or UV irradiation. The applied amount of the release agent after drying is preferably 0.05 to ² g / m ² . The type of the silicone resin may be a solvent-based addition type or a condensation type, or a silicone resin containing no solvent or a UV-curable type. The release material preferably has a water content of 3 to 7% by weight.

As the pressure-sensitive adhesive used in the pressure-sensitive adhesive layer of the present invention, various pressure-sensitive adhesives such as acrylic, rubber-based, silicone-based, and polyester-based pressure-sensitive adhesives can be used, and acrylic pressure-sensitive adhesives are particularly preferable. is there. The acrylic pressure-sensitive adhesive referred to herein is a pressure-sensitive adhesive containing an acrylic ester copolymer. Monomers constituting the acrylate copolymer include butyl (meth) acrylate, hexyl (meth) acrylate, octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, and (meth) acryl. Lauryl acid, ethyl acrylate, methyl acrylate,
At least one kind such as vinyl acetate is exemplified. Examples of the other copolymerizable monomers include at least one kind of unsaturated carboxylic acid-containing monomer such as acrylic acid, methacrylic acid, maleic acid, crotonic acid, and itaconic acid. Preferably, the monomers are copolymerized. In addition to these monomers, at least one of (meth) acrylamide, glycidyl (meth) acrylate, etc.
The species is also copolymerizable.

The pressure-sensitive adhesive can be produced by a polymerization method such as solution polymerization or emulsion polymerization of the above-mentioned monomers, but an emulsion-type pressure-sensitive adhesive obtained by emulsion polymerization is particularly preferable from the viewpoint of safety. The adhesive includes, as necessary, a tackifier, a dispersant, a thickener, an antifoaming agent, a leveling agent, a wetting agent,
Additives such as a curing agent and an antistatic agent can be appropriately added. As a method of providing the pressure-sensitive adhesive layer, the pressure-sensitive adhesive is applied to one side of the paper substrate or the release agent layer side of the release material, and dried,
After forming the pressure-sensitive adhesive layer, a method of bonding to a release material or a paper substrate is preferable. As a method of applying the adhesive, a roll coater, a reverse coater, a roll knife coater,
Gravure coater, air knife coater, die coater, spray coater and the like can be mentioned. The application amount of the pressure-sensitive adhesive layer is preferably adjusted in the range of 5 to 50 g / m ² , and particularly preferably in the range of 10 to 30 g / m ² , based on the solid weight of the pressure-sensitive adhesive. In the step of applying a pressure-sensitive adhesive to form a pressure-sensitive adhesive layer and bonding the paper base material and the release material, or in a subsequent step, an air knife, a rotor damping, a paper base by a water imparting method such as spray damping,
The curl of the pressure-sensitive adhesive sheet for image recording can be adjusted by adjusting the water content of the release material. The pressure-sensitive adhesive sheet for image recording is wound into a roll shape, and then cut by a slitter to form a roll or a plain sheet of an appropriate size. The image recorded on the pressure-sensitive adhesive sheet for image recording of the present invention is not particularly limited, characters,
Symbols, graphics, pictures, photographs, and one of these same or different types
Various images such as combinations of more than one kind can be obtained.

[0014]

Next, the present invention will be described more specifically with reference to examples. The present invention is not limited by these examples. (Production Example 1) Preparation of Paper Base 1 70% by weight of LBKP, 20% by weight of NBKP, and 10% by weight of deinked pulp obtained as used paper as pulp were mixed, and the shopper beating degree was set to 30 ° SR. After adjustment, calcium carbonate was added as a filler to a content of 15% by weight after papermaking, and a sizing agent, a paper strength enhancer, and the like were added. Using this stock, papermaking is carried out with a fourdrinier paper machine, and a 5% by weight aqueous solution of starch containing 2% by weight of a quaternary ammonium salt (lauryltrimethylammonium chloride) is used as a base paper by a size press on the paper machine. After drying on both sides, the quaternary ammonium salt was applied so that the application amount was 1.0 g / m ² . Then, a calendering treatment was performed to obtain a paper substrate 1 having a surface area of 50 g / m ² , a thickness of 60 μm, and a smoothness of 80 seconds for the surface to be a printing surface. (Production Example 2) Preparation of Paper Base 2 In Production Example 1, except that the content of calcium carbonate was changed to 7% by weight after papermaking,
Paper substrate 2 was obtained.

(Preparation Example 3) Preparation of paper base material 3 Paper base material 3 was obtained in the same manner as in Preparation Example 1, except that the content of calcium carbonate was changed to 35% by weight after papermaking. Was. (Production Example 4) Preparation of Paper Base Material 4 A paper base material 4 was obtained in the same manner as in Production Example 1 except that the starch solution excluding the quaternary ammonium salt was applied to the paper substrate. . (Production Example 5) Preparation of Paper Base Material 5 A paper base material 5 was obtained in the same manner as in Production Example 1, except that the calender treatment was not performed and the smoothness of the paper substrate was adjusted to 20 seconds. Was. (Production Example 6) Preparation of Paper Base 6 In Production Example 1, a paper base 6 was prepared in the same manner as in Production Example 1 except that the calendering treatment was performed intensely and the smoothness of the paper base was adjusted to 300 seconds. Obtained.

(Example 1) NB was used as pulp of a release material base paper.
40% by weight of KP, 50% by weight of LBKP, and 10% by weight of deinked waste paper pulp are mixed and the beating degree is 40 ° S.
R, talc was added as a filler to a content of 5% by weight after papermaking, papermaking was carried out with a fourdrinier paper machine, and a polyvinyl alcohol was used as a filling layer with a size press on the paper machine. (PVA) is applied to both sides of the base paper so that the thickness after drying becomes 1 μm, smoothness is 70 seconds by calendering, and air permeability is 500 as a release paper after applying a release agent.
A release material having 0 seconds was obtained. The silicone resin as a release agent is prepared by applying a solvent-based, addition-type silicone-based release agent (KS830, manufactured by Shin-Etsu Chemical Co., Ltd.) to one side of the base paper for the release material at 130 ° C.
After the heat drying, a coating was formed to a coating amount of 0.8 g / m ² . Next, an acrylic pressure-sensitive adhesive (Olivine BPW5176-1) was applied to the release agent layer surface of the release material using a reverse coater, dried at 110 ° C., and applied at a coating amount of 20 g / m 2.
No. ² pressure-sensitive adhesive layer was provided. After drying, the paper base 1 was laminated with a laminator and wound up. Thereafter, the water content of both the paper base material and the release material was adjusted by roller damping, and the water content of the paper base material was 5% by weight, and the water content of the release material base paper was 5.7.
The water content was adjusted to be% by weight. After being kept in a roll state for 3 days, it was cut into an A4 size plain sheet with a sheet cutter to obtain a sample of an adhesive sheet for image recording.

Example 2 Example 2 was repeated except that polyvinyl alcohol was applied to both sides of the release material base paper of Example 1 so as to have a coating thickness of 2 μm after drying to form a filling layer. In the same manner as in Example 1, a sample of an image recording pressure-sensitive adhesive sheet was obtained. In addition, the air permeability of the release material after applying the release agent is 59.
00 seconds. (Example 3) A sample of the pressure-sensitive adhesive sheet for image recording was obtained in the same manner as in Example 1 except that the release material base paper of Example 1 was not provided with a filling layer of polyvinyl alcohol. The air permeability of the release material after the release agent was applied was 4,300 seconds.

(Comparative Example 1) Example 1 was repeated except that the beating degree of the release material base paper of Example 1 was adjusted to 30 ° SR and polyvinyl alcohol as a sealing layer was not applied.
A sample was prepared in the same manner as described above. The obtained release material had a gas permeability of 300 seconds as a release material after application of the release agent. (Comparative Example 2) The beating degree of the release material base paper of Example 1 was 50 ° S.
A sample was prepared in the same manner as in Example 1, except that the sample was adjusted to R and changed so that polyvinyl alcohol as a sealing layer was not applied. The obtained release material had an air permeability of 23,000 seconds as a release material after the release agent was applied.

Comparative Example 3 A sample was prepared in the same manner as in Example 1 except that the beating degree of the release material base paper of Example 1 was adjusted to 50 ° SR, and polyvinyl alcohol as a sealing layer was applied to a thickness of 2 μm. It was created. The obtained release material had an air permeability of 25,000 seconds as a release material after the release agent was applied.

Comparative Example 4 A sample was prepared in the same manner as in Example 1 except that the beating degree of the release material base paper of Example 1 was adjusted to 50 ° SR, and polyvinyl alcohol as a sealing layer was applied to a thickness of 5 μm. It was created. The obtained release material had an air permeability of 29000 seconds as a release material after the release agent was applied. (Comparative Example 5) A sample was prepared in the same manner as in Example 1, except that the paper substrate 2 was used instead of the paper substrate 1. (Comparative Example 6) A sample was prepared in the same manner as in Example 1 except that the paper substrate 3 was used instead of the paper substrate 1.

(Comparative Example 7) In Example 1, the paper substrate 1
A sample was prepared in the same manner as in Example 1 except that the paper substrate 4 was used instead of the above. (Comparative Example 8) A sample was prepared in the same manner as in Example 1, except that the paper substrate 5 was used instead of the paper substrate 1. (Comparative Example 9) A sample was prepared in the same manner as in Example 1, except that the paper substrate 6 was used instead of the paper substrate 1.

The physical properties of the samples obtained in the above Examples and Comparative Examples were measured by the following measuring methods.
3 is shown. (1) Beating degree: Measured according to JIS P-8121 (Shopper type). (2) Filler layer thickness: Calculated from cross-sectional photography using an electron microscope. (3) Air permeability: Measured according to JIS P-8117. (4) Smoothness: Measured in accordance with JIS P-8119 (Beck method). (5) Measurement of curl of adhesive paper: sample at 10 ° C., 20% RH
The curl height (maximum value) at the four corners of the sample after leaving the paper substrate side of the pressure-sensitive adhesive sheet facing upward in two kinds of environments of 23 ° C. and 65% RH was measured. (6) Curl measurement immediately after printing: Printing with laser printer LP-8200 manufactured by Seiko Epson Corporation, and ejection 5
Two seconds later, the pressure-sensitive adhesive sheet was placed on a table with the paper substrate side facing upward, and the curl height at four corners was measured. And in the table have the following meanings. : 10 ° C, 20% RH: 23 ° C, 65% RH

(7) Printer runnability: 100 samples of each sample were printed with a laser printer LP-8200 manufactured by Seiko Epson Corporation, and the presence or absence of a paper jam due to double feed or idle feed at that time was confirmed. (8) Suitability of release agent coating: The degree to which the release agent penetrated the release material base paper during the release agent processing (through-through) was visually checked, and the peelability of the pressure-sensitive adhesive sheet was evaluated according to the following criteria. 〇: No strikethrough was observed, and the releasability was good (light). : No strikethrough was observed, but the releasability was poor (heavy). C: Penetration was confirmed, and the releasability was particularly poor (very heavy). (9) Laser printer printing performance: laser printer
Printing was performed using LP-8200 manufactured by Seiko Epson Corporation, and the printed image was evaluated according to the following criteria. The image contains JIS X
The S-6 image of -9201 (1995) was used. 〇: Printing over 90% is possible, including low density gradations. : 80% to 90% can be printed, including a low density gradation portion. X: Less than 80% can be printed, including a low-density gradation part.

(10) Inkjet printing performance: inkjet printer PM-70 manufactured by Seiko Epson Corporation
Printing was performed at 0C, and the printed image was evaluated according to the following criteria.
The image contains S-6 of JIS X-9201 (1995).
Images were used. 〇: Printing over 90% is possible, including low density gradations. : 80% to 90% can be printed, including a low density gradation portion. X: Less than 80% can be printed, including a low-density gradation part. (11) Thermal transfer printing performance: Thermal transfer A ruled line was printed with a word processor, Reporter JW95KV2 manufactured by Toshiba, and the degree of blur was evaluated according to the following criteria. 〇: Normally printed without breaks in ruled lines. : A part of the ruled line is broken, and the thickness of the line is uneven. ×: There are many broken lines in the ruled lines, making it difficult to recognize the ruled lines and characters.

[0025]

[Table 1]

[0026]

[Table 2]

[0027]

[Table 3]

[0028]

The pressure-sensitive adhesive sheet for image recording of the present invention can prevent double feed and empty feed, suppress curl, record clear images on the surface, and use electrophotographic, ink-jet and thermal transfer systems. Can be used for many types of recording methods.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) G03G 7/00 B41M 5/26 HF term (reference) 2H086 BA21 BA24 BA32 BA41 BA44 2H111 AA01 CA02 CA05 CA14 CA23 CA29 CA44 4J004 AA05 AA10 AA11 AA15 AB01 CA02 CA07 CB02 CC02 DA01 DA02 DA03 DB02 FA01 4L055 AC06 AC09 AG11 AG12 AG26 AG35 AG64 AG71 AG86 AH01 AH50 AJ02 AJ03 BE08 BE10 EA08 EA12 FA18 GA09 GA11 GA13 GA42

Claims (2)

[Claims] 1. A surface treatment liquid comprising a paper base material, an adhesive layer and a release material laminated in this order, the paper base material containing 10 to 30% by weight of a filler and the surface containing a quaternary ammonium salt. Is applied or impregnated to have a smoothness of 30 to 200 seconds, and the release material has an air permeability of 500 to 20,000 seconds. 2. The adhesive for image recording according to claim 1, wherein the release material is provided with a filler layer having a thickness of 3 μm or less on the surface of the release material base paper, and further provided with a release agent layer on the surface. Sheet.