JP2003221560A - Heat-sensitive adhesive sheet and information recording product using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat-sensitive adhesive sheet having high heat-sensitive adhesivity to a recording material and enabling a postcard to be given more transmitted information without destructing recorded information, and to provide an information recording product having good unsealability and functioning as a confidential postcard with good information legibility. <P>SOLUTION: This heat-sensitive adhesive sheet for use in the heat-sensitive bonding between the information recording surfaces of respective recording materials is such one that heat-sensitive adhesive layers preferably 60-85°C in melt flow temperature (MFT) are formed on both sides of a substrate having on one side a release layer ≥350% in elongation at break, respectively; wherein the 180° peel strength at the interface between the substrate and the release layer is 20-150 g/50 mm at a peel rate of 500 mm/min at 23°C and 50% RH. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-sensitive adhesive sheet capable of heat-sensitively adhering information recording surfaces of a recording material to each other and an information recording body using the heat-sensitive adhesive sheet, which can hide information. The present invention relates to a heat-sensitive adhesive sheet used for cards, postcards, etc., and particularly for transmitting more information at the same postage rate as a postcard, and an information recording body using the same.

[0002]

2. Description of the Related Art In recent years, various types of payment notifications such as social insurance agencies, banks, securities companies, post offices, electric power companies, etc., such as payment notifications, receipts, and notifications relating to personal information such as maturity notifications and direct mail have been conventionally used. However, in the case of a sealed letter, the mailing fee is higher than that of a postcard, and when a large number of sealed letters are mailed, the mailing cost must be enormous.

In order to solve such a problem, in recent years, the information recording surfaces of two recording materials on which transmission information such as characters and pictures are recorded are pseudo-bonded to each other through a heat-sensitive adhesive sheet to transfer the transmission information. Practical application of various proposals in which the amount of information can be increased to the level of a sealed letter and the recipient can peel off one of the recording materials to keep the information secret until the information recorded inside is read. Has been done.

Examples of these proposals include a postcard in which a heat-sensitive adhesive capable of recording information on the surface is formed on one side of a paper support. (Actual Kaihei 1-14
8371 publication). This envelope postcard is folded in half to have a postcard size, and the heat-sensitive adhesives are pressure-bonded under heating so as to have a peelable adhesive strength.
However, this postcard has a problem in that the recorded content is transferred to the other surface because information is recorded on the peeling surface which is the surface of the heat-sensitive adhesive layer. In addition, since it is difficult to adjust the adhesive strength of the heat-sensitive adhesive layer, peeling curl occurs, which makes it difficult to read information.

Further, a heat-sensitive adhesive sheet and an information recording body using the same, in which information can be pseudo-bonded to each other after recording information on two postcard-sized recording materials on which information is recorded Has also been proposed (JP-A-4-126).
298). However, in the case of an information recording body using this heat-sensitive adhesive sheet, a coating film (coating film + recording information or coating film + recording information) at the peeling trigger portion was printed when the information recording surface was peeled and developed. There is a problem that the surface layer of the information recording medium is torn and the torn coating film is transferred to the other transmitted information surface, making it difficult to read the information. Also, when heat-sensitive adhesive is sandwiched between the information recording surfaces of two postcard-sized recording materials for heat-sensitive adhesion, the heat-melted synthetic resin coating layer protrudes from the edge of the recording medium, and the support and synthetic resin coating layer are applied. Since the peeling interface with the work layer is covered with the resin, there is a problem that unsealing is likely to occur. Further, there is a problem that the heat-sensitive adhesiveness to the recording material printed with the UV heat resistant ink is poor.

The above-mentioned problems are caused by the fact that one side of the support is provided with a thermoplastic resin layer having a constant Vicat softening temperature on both sides of the support so that it can be easily peeled off but does not spontaneously peel off. A heat-sensitive adhesive sheet having a four-layer structure in which a heat-sensitive adhesive layer having a constant glass transition temperature or a Vicat softening temperature is formed, and a 180-degree peel strength at the interface between the support and the thermoplastic resin layer is specified. It was improved by a confidential postcard using a heat-sensitive adhesive sheet (Japanese Patent Laid-Open No. 07-17166). However, in recent years, papers with different properties may be used for various invoices, statements, and confidential postcards such as direct mail. In such a case,
It was found that even if the above heat-sensitive adhesive sheet is used, the resin coating layer may slightly protrude at the time of heat-sensitive adhesion, and unsealing failure may occur by covering the peeling interface between the support and the thermoplastic resin. did.

[0007]

SUMMARY OF THE INVENTION Therefore, the first object of the present invention is to use a heat-sensitive adhesive property with a recording material, which is used for heat-sensitively adhering the information recording surfaces of the recording material in a peelable manner. Another object of the present invention is to provide a heat-sensitive adhesive sheet that can hold more recorded information that is not destroyed. A second object of the present invention is to provide an information recording material which is excellent in unsealing property and information legibility and which is useful as a confidential postcard.

The above objects of the present invention are to provide a heat-sensitive adhesive sheet for heat-sensitively adhering information recording surfaces of a recording material having information recording surfaces, wherein the heat-sensitive adhesive sheet has elongation at break on one surface of the support. Is a heat-sensitive adhesive sheet formed by forming heat-sensitive adhesive layers on both sides of a support having a release layer of 350% or more, the 180-degree peel strength of the interface between the support and the release layer is 23 ° C. , 50% RH environment, peeling speed 50
It is 20 to 150 g / 50 mm at 0 mm / min, and
The 180-degree peel strength of the interface between the heat-sensitive adhesive layer and the information recording surface when sandwiched between the information recording surfaces of the recording material and heat-sensitively bonded is 23 ° C. in an environment of 50% RH, and a peeling speed of 5
The heat-sensitive adhesive sheet is characterized in that it is 300 g / 50 mm or more at 00 mm / min, and the heat-sensitive adhesive sheet has two or more information recording surfaces between each information recording surface of two recording materials. Sandwiched between the information recording surfaces of the recording material,
This is achieved by an information recording body which is heated and integrated. The confidential postcard obtained by using the heat-sensitive adhesive sheet of the present invention having the above-mentioned constitution, the heat-sensitive adhesiveness with a recording material and no coating film breakage at the time of peeling development, and the unsealing rate is remarkably improved. Has a unique effect. Hereinafter, the present invention will be described in more detail.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The support used in the present invention includes a plastic film such as polyethylene terephthalate, polypropylene, polyethylene, polyvinyl chloride, polystyrene, polycarbonate and triacetate,
Alternatively, sheets such as impregnated paper and glassine paper can be used, but polyethylene terephthalate is particularly preferable from the viewpoint of heat resistance, transparency, dimensional stability, and cost. The thickness of the support in the present invention is not particularly limited, but is preferably 12 to 150 μm.

The release layer provided on one side of the support is
Elongation at break of coating film is 350% (Elongation at break is measured by JI
It is necessary that the formation layer is adjusted so as to be equal to or higher than SK-6760). Elongation at break is 350
When it is less than%, when a heat-sensitive adhesive sheet is sandwiched between the information recording surfaces and the information recording body integrated by heat-sensitive adhesion is peeled and developed, the coating film at the peeling start point (release layer separated by peeling development + heat-sensitive adhesion The agent layer) may be torn and transferred to the other surface, deteriorating the readability of the recorded information.

While the release layer is in close contact with the heat-sensitive adhesive layer formed thereon, the release layer should be peeled off smoothly at the interface between the support and the release layer when the information recording medium is opened. The peeling-off part coating film is not torn, and the 180 ° peel strength at the interface between the support and the release layer is 23 ° C. and 50% RH, and the peeling speed is 500.
It is necessary to be 20 to 150 g / 50 mm in mm / min (peeling strength measurement is based on JIS Z-0237), and particularly preferably 20 to 100 g / 50 mm. Peel strength between support and release layer is 20g / 50m
If it is less than m, spontaneous peeling is likely to occur and the postcard may open during mailing. Also, peel strength is 150g / 50mm
If it exceeds, there is a problem that peeling curl occurs, and when a recording material having a weak surface strength is used, the surface of the recording material is peeled off at the time of opening and the readability of information is deteriorated.

Examples of the polymer resin used for the release layer include polyethylene resin, ethylene / methacrylic acid copolymer resin, ionomer resin, ethylene / ethyl acrylate copolymer resin, or a mixture thereof. . In the present invention, especially a mixture system of polyethylene resin and ionomer resin (mixing ratio = 95/5 to 30)
/ 70) is preferable because it is excellent in peeling stability. The thickness of the release layer formed is preferably 1 to 10 μm, and particularly preferably 1 to 7 μm. Further, an inorganic or organic pigment may be added to the release layer for the purpose of improving the running property during production of the heat-sensitive adhesive sheet of the present invention and preventing blocking of the winding sheet. The amount of the pigment added is within a range of 5% by weight or less without deteriorating the peelability from the support, the adhesion to the heat-sensitive adhesive layer, the coating film elongation and the readability (transparency) of the recorded information. It is preferable. Further, it is possible to add a fragrance, an antistatic agent, a leveling agent, a coloring agent and the like.

The heat-sensitive adhesive layer, which is a constituent element of the heat-sensitive adhesive sheet of the present invention, sufficiently adheres to the release layer, but at the same time, has a low temperature sealing property with the recording material on which information is recorded and preservation of winding of the heat-sensitive adhesive sheet. Excellent in properties (no occurrence of blocking) and MFT of the resin forming the heat-sensitive adhesive layer is 60-
85 ° C (MFT is measured according to ASTM D 2354-65
It is preferably a forming layer formed by using a resin (according to T), and particularly preferably 60 to 75 ° C.
When a resin having an MFT of less than 60 ° C. is used, there is a problem that blocking of the roll-up sheet is likely to occur during production of the heat-sensitive adhesive sheet. Further, when the information recording body is continuously manufactured by sandwiching the heat-sensitive adhesive sheet between two information recording surfaces, misalignment is caused due to poor insertion (sliding) of the heat-sensitive adhesive sheet to the information recording surface. However, there is a problem in that the heat-sensitive adhesive sheet is likely to be integrated with the heat-sensitive adhesive sheet in a form protruding from the information recording surface. Further, when a resin having an MFT of more than 85 ° C. is used, the heat-sensitive adhesive property between the information recording surface and the heat-sensitive adhesive sheet is deteriorated, and it is difficult to obtain a normally integrated information recording body, and the information recording surface Due to poor adhesion between the heat-sensitive adhesive layer and the heat-sensitive adhesive layer, there is a problem that the interface between the support and the release layer, which should originally be peeled off when the information recording body is peeled and developed, is not peeled off and the information recording surface is destroyed. . According to many results of experiments conducted by us, the value of this MFT is determined by sandwiching the heat-sensitive adhesive sheet between the information recording surfaces and heat-pressing the heat-sensitive adhesive sheet to produce an integrated information recording body. It matches the temperature to be applied to the agent layer surface. In other words, the temperature applied to satisfy the heat-sensitive adhesiveness between the information recording surface and the heat-sensitive adhesive layer surface of the heat-sensitive adhesive sheet is equal to the MFT value.

As the polymer resin used in the heat-sensitive adhesive layer, ethylene / vinyl acetate copolymer resin, polyester resin, ethylene / acrylic acid copolymer resin, ethylene / ethyl acrylate copolymer resin, polyurethane resin, polyamide resin. It is desirable to use at least one resin selected from among vinyl acetate resins and the like. Particularly, it is preferable to use a single substance of ethylene / vinyl acetate copolymer resin or a mixture of a plurality thereof. Further, by adding an inorganic or organic pigment to the heat-sensitive adhesive layer to form a matte, when the heat-sensitive adhesive sheet of the present invention is sandwiched between the recording materials to produce a recording medium, the molten resin is Not only can it be prevented from protruding from the gap, but also blocking of the roll-up sheet at the time of producing the heat-sensitive adhesive sheet of the present invention can be prevented. The amount of the pigment added is preferably 0.5 to 10% by weight, and particularly preferably 0.5 to 7% by weight, based on 100% by weight of the heat-sensitive adhesive layer.
When the pigment addition ratio is less than 0.5% by weight, blocking of winding of the heat-sensitive adhesive sheet is likely to occur, and the resin melted during the production of the information recording body tends to stick out from between the recording materials, and the unsealing property is likely to be deteriorated. Not good for Further, if the addition amount exceeds 10% by weight, the heat-sensitive adhesion to the information recording surface may be poor, which is not preferable. Further, it is possible to add a fragrance, an antistatic agent, a leveling agent, a coloring agent and the like.

The recording material used in the information recording medium of the present invention is
It can be appropriately selected and used from known materials such as paper and computer printing paper used for ordinary postcards. The information recording body of the present invention is obtained by sandwiching the heat-sensitive adhesive sheet of the present invention between the information recording surfaces of a recording material and heat-sensitively adhering it to integrate it into a postcard size. In this case, if the size and weight of the information recording medium satisfy the requirements for postcards, they are handled as postcards that can be mailed.

The information recording medium of the present invention is shown in FIG.
As described above, the information recording surfaces of the two postcard-sized recording materials can be integrated by heat-sensitively adhering them, or the recording materials printed on three sides simultaneously on a computer printing paper or the like can be S-folded or Z-shaped.
It is also possible to fold the mold and integrate the opposing information recording surfaces. Therefore, in the latter case, the postcard can be provided with four information recording surfaces, so that the postcard can have a larger amount of information. Of course, instead of using it as a postcard, it can also be used as an information recording body to be mailed in a sealed letter.

[0017]

The heat-sensitive adhesive sheet of the present invention has a peeling layer whose peeling force is highly accurately adjusted within a certain range. Therefore, the information recording medium of the present invention using the adhesive sheet of the present invention is not only excellent in opening property, but also recorded information is not destroyed, and is extremely effective as a postcard.

[0018]

EXAMPLES The present invention will be described in more detail below with reference to examples, but the present invention is not limited thereto. All "parts" in the examples represent parts by weight.

[0019] Example 1. <Release layer forming liquid> Polyethylene resin (elongation at break 900%) 16.0 parts   (Chemipearl A-200: trade name manufactured by Mitsui Chemicals, Inc.) Ionomer resin, elongation at break 400% 4.0 parts   (Chemipearl S-200: trade name of Mitsui Chemicals, Inc.) Water 40.0 parts Methanol 40.0 parts

[0020] <Thermal adhesive layer forming liquid> Ethylene / vinyl acetate copolymer resin (MFT 60 ° C) 19.9 parts   (Aquatex EC-1200: trade name of Chuo Rika Kogyo Co., Ltd.) Silica (Sylysia 445: trade name of Fuji Silysia Chemical Ltd.) 0.1 part Water 40.0 parts Methanol 40.0 parts

A polyethylene terephthalate film having a thickness of 16 μm is used as a plastic film support, and the release layer forming liquid described above is applied to one surface of the film using a roll coater and dried at 100 ° C. for 1 minute to obtain a film having a thickness of about 5 μm. A release layer was formed. The surface different from the release layer is coated with the heat-sensitive adhesive layer forming liquid by a roll coater,
It was dried at 0 ° C. for 1 minute to form a heat-sensitive adhesive layer having a thickness of about 6 μm. Similarly, the heat-sensitive adhesive layer-forming liquid was applied onto the release layer and dried to form a heat-sensitive adhesive layer having a thickness of about 6 μm, to prepare the heat-sensitive adhesive sheet of the present invention.

Next, coated paper having a basis weight of 93.7 g / m ² was used as a recording material, UV heat-resistant ink (ultraviolet curing ink) was used, and a character such as a postal code frame and a postal code "postal code" was provided on one side. Printed. Next, after the transmission information is printed on the other two surfaces of the respective recording materials, the information recording surfaces are joined together by a Gemitz machine (manufactured by Duplo Seiko Co., Ltd.) capable of continuously producing information recording bodies. The recording material is folded in two so that they overlap each other, the heat-sensitive adhesive sheet obtained above is sandwiched, and then passed through two rolls whose surface temperature is adjusted to 140 ° C. to form an integrated information recording medium. I made a postcard.

The postcard prepared as described above showed good openability without spontaneous peeling at the interface between the release layer and the heat-sensitive adhesive layer. Further, peeling curl did not occur, and when peeling a postcard, the coating film at the peeling start part was not torn and transferred to the other surface, and the readability of the recorded information was good. The 180 ° peel strength of this information recording body was 23 ° C.
When measured at a peeling speed of 500 mm / min in an environment of 50% RH, it was 99 g / 50 mm. Then, as a result of winding this heat-sensitive adhesive sheet and storing it in an environment of 40 ° C. for 1 month, it was confirmed that blocking did not occur and the long-term storage property was excellent. In addition, it was confirmed that the total weight of the postcard was within the standards of the Postal Law and that it could be used as a postcard.

Example 2. The same procedure as in Example 1 was carried out except that the heat-sensitive adhesive layer forming liquid shown below was used in place of the heat-sensitive adhesive layer forming liquid used in Example 1. <Heat-sensitive adhesive layer forming liquid> Ethylene / vinyl acetate copolymer resin (MFT 73 ° C) 19.9 parts (Aquatex EC-C0186: product name of Central Rika Kogyo Co., Ltd.) Silica (Sylysia 445: Fuji Silysia Chemical Product name: 0.1 part Water 40.0 parts Methanol 40.0 parts The postcards produced show good openability without spontaneous peeling at the interface between the release layer and the heat-sensitive adhesive layer. It was Further, peeling curl did not occur, and when peeling a postcard, the coating film at the peeling start part was not torn and transferred to the other surface, and the readability of the recorded information was good. The 180 ° peel strength of this information recording medium was measured under the environment of 23 ° C. and 50% RH.
When measured at a peeling speed of 500 mm / min, it was 93 g / 5.
It was 0 mm. Then, as a result of winding this heat-sensitive adhesive sheet and storing it in an environment of 40 ° C. for 1 month, it was confirmed that blocking did not occur and the long-term storage property was excellent. In addition, it was confirmed that the total weight of the postcard was within the standards of the Postal Law and that it could be used as a postcard.

Example 3. The same procedure as in Example 1 was carried out except that the release layer forming liquid shown below was used instead of the release layer forming liquid used in Example 1. <Release forming liquid> Ionomer resin (elongation at break 350%) 20.0 parts (Chemipearl S-100: trade name of Mitsui Chemicals, Inc.) water 40.0 parts methanol 40.0 parts In addition, there was no spontaneous peeling at the interface between the release layer and the heat-sensitive adhesive layer, and good openability was exhibited. It showed a good opening property. Further, peeling curl did not occur, and when peeling a postcard, the coating film at the peeling start part was not torn and transferred to the other surface, and the readability of the recorded information was good. The 180 ° peel strength of this information recording body was 23 ° C.
When measured at a peeling speed of 500 mm / min in an environment of 50% RH, it was 23 g / 50 mm. Then, as a result of winding this heat-sensitive adhesive sheet and storing it in an environment of 40 ° C. for 1 month, it was confirmed that blocking did not occur and the long-term storage property was excellent. In addition, it was confirmed that the total weight of the postcard was within the standards of the Postal Law and that it could be used as a postcard.

Example 4. The same procedure as in Example 3 was performed except that the heat-sensitive adhesive layer forming liquid shown below was used instead of the heat-sensitive adhesive layer forming liquid used in Example 3. <Thermal adhesive layer forming liquid> Ethylene / vinyl acetate copolymer resin (MFT 73 ° C) 18.0 parts (Aquatex EC-C0186: trade name of Chuo Rika Kogyo Co., Ltd.) Silica (Sylysia 445: Fuji Silysia Chemical Brand name manufactured by Co., Ltd. 2.0 parts Water 40.0 parts Methanol 40.0 parts The prepared postcard does not have spontaneous peeling at the interface between the release layer and the heat-sensitive adhesive layer, and shows good openability. It was Further, peeling curl did not occur, and when peeling a postcard, the coating film at the peeling start part was not torn and transferred to the other surface, and the readability of the recorded information was good. The 180 ° peel strength of this information recording medium was measured under the environment of 23 ° C. and 50% RH.
25 g / 5 when measured at a peeling speed of 500 mm / min
It was 0 mm. The other performances were exactly the same as those of the postcard obtained in Example 3.

Example 5. The same procedure as in Example 1 was carried out except that the heat-sensitive adhesive layer forming liquid shown below was used in place of the heat-sensitive adhesive layer forming liquid used in Example 1. <Heat-sensitive adhesive layer forming liquid> Ethylene / vinyl acetate copolymer resin (MFT 85 ° C) 18.0 parts (Aquatex MC-4400: trade name of Central Rika Kogyo Co., Ltd.) Silica (Sylysia 445: Fuji Silysia Chemical Product name: 2.0 parts Water 40.0 parts Methanol 40.0 parts The postcards produced are free from spontaneous peeling at the interface between the release layer and the heat-sensitive adhesive layer, and the postcards are almost opened successfully. It was sex.
Further, the peeling curl did not occur, and when the postcard was peeled off, the coating film at the peeling start part was not torn and transferred to the other surface, and the readability of the recorded information was almost good.
The 180 ° peel strength of this information recording material is 23 ° C, 50%
When measured at a peeling rate of 500 mm / min in an RH environment, it was 95 g / 50 mm. For other performance,
It was exactly the same as the postcard obtained in Example 1.

Comparative Example 1. The same procedure as in Example 1 was carried out except that the release layer forming liquid shown below was used in place of the release layer forming liquid used in Example 1. <Release Layer Forming Liquid> Ionomer resin (elongation at break 240%) 20.0 parts (Chemipearl S-75N: trade name of Mitsui Chemicals, Inc.) Water 40.0 parts Methanol 40.0 parts Obtained In the postcard, there was no spontaneous peeling at the interface between the release layer and the heat-sensitive adhesive layer, and peeling at the interface between the support and the release layer was possible. There is a problem that the information is easy to be transferred and the information of the transferred part cannot be read. Also, the 180 degree peel strength of postcards is 23
When measured at 500 mm / min in an environment of ° C and 50% RH, it was 22 g / 50 mm. The other performances were exactly the same as the postcard obtained in Example 1.

Comparative Example 2. The same procedure as in Example 1 was carried out except that the release layer forming liquid shown below was used in place of the release layer forming liquid used in Example 1. <Release layer forming liquid> Ethylene / vinyl acetate copolymer resin (elongation at break: 600%) 20.0 parts (Chemipearl V-200: trade name of Mitsui Chemicals, Inc.) Water 40.0 parts Methanol 40 Although the postcard prepared by 0.0 part did not have spontaneous peeling at the interface between the release layer and the heat-sensitive adhesive layer, there was a problem that the coat layer on the surface of the recording material was peeled off, and few were able to be opened normally. It was In addition, the 180 degree peel strength of this recording material is set to 2
When measured at a peeling speed of 500 mm / min in an environment of 3 ° C. and 50% RH, it was 160 g / 50 mm. The other performances were the same as those of the postcard obtained in Example 1.

[0030]

[Table 1]

The peel strength, post-coating transfer, opening rate, blocking, and legibility of information in postcards in the table were evaluated as follows. a) Peel strength: A postcard is cut into a size of 50 mm × 140 mm, and 23 ° C. 50% according to JIS Z-0237.
The peel resistance was measured under a RH environment at a peel speed of 500 mm / min. b) Transfer of coating film: The information recording material was peeled and developed, and the presence or absence of transfer to the other surface of the coating film at the peeling start portion was visually observed. No: No coating film transfer, Yes: Coating film transfer c) Opening rate: 2000 sheets of postcards were subjected to an opening test and calculated by the following formula. Opening rate (%) = (number of postcards that have been normally peeled off / total number of postcards) x 100 d) Blocking of the winding sheet: After winding the winding of the heat-sensitive adhesive sheet for one month in an environment of 40 ° C, The presence or absence of blocking of winding was visually confirmed. ◯: No blocking occurred, ×: Blocking occurred e) Readability of information Whether or not the recorded information was legible when there was no transfer to the other surface of the coating film at the peeling start part when the information recording medium was peeled and developed. It was visually confirmed. ⊚: All read good, ○: Almost read, ×: Poor read

As is apparent from Table 1, the heat-sensitive adhesive sheet of the present invention is suitable for peelably heat-sensitively adhering the information recording surfaces of the information recording material on which information is recorded, and the heat-sensitive adhesive sheet of the present invention. It was demonstrated that the unsealing property of the information recording material using was extremely excellent.

[Brief description of drawings]

FIG. 1 is a cross-sectional configuration diagram of an information recording medium of the present invention when the heat-sensitive adhesive sheet of the present invention is used.

[Explanation of symbols]

A: support B: Release layer C: Heat-sensitive adhesive layer C ': heat-sensitive adhesive layer D: Heat-sensitive adhesive sheet E: Information recording material Ea: Information recording surface Eb: Information recording surface

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Naohiro Omote             1551 Todaira, Higashimatsuyama City, Saitama Japan Paper Co., Ltd.             Ceremony company Higashimatsuyama office F-term (reference) 2C005 WA03                 4J004 AA07 AA09 AA10 AA14 AA15                       AA16 AB03 CA03 CB03 CC02                       FA10                 4J040 DA051 DA061 DA071 DA081                       DE001 ED001 EF001 EG001                       JA09 JB01 LA06 NA21

Claims (4)

[Claims] 1. A heat-sensitive adhesive sheet used for heat-sensitively adhering information recording surfaces of a recording material having an information recording surface, wherein the heat-sensitive adhesive sheet has a breaking elongation of 350% or more on one surface of a support. A heat-sensitive adhesive sheet obtained by forming heat-sensitive adhesive layers on both sides of a support having a mold layer, wherein the 180 ° peel strength at the interface between the support and the release layer is 23 ° C.
20% at a peeling speed of 500 mm / min in an environment of 50% RH
In addition to 150 g / 50 mm, the 180-degree peel strength at the interface between the heat-sensitive adhesive layer and the information recording surface was 23 ° C. when sandwiched between the information recording surfaces of the recording material for heat-sensitive adhesion.
300 g at a peeling speed of 500 mm / min in an environment of 50% RH
/ 50 mm or more, a heat-sensitive adhesive sheet. 2. The MF of a resin forming the heat-sensitive adhesive layer
The heat-sensitive adhesive sheet according to claim 1, wherein T is 60 to 85 ° C. 3. The resin forming the heat-sensitive adhesive layer is ethylene / vinyl acetate copolymer resin, polyester resin, ethylene / acrylic acid copolymer resin, ethylene / ethyl acrylate copolymer resin, polyurethane resin, polyamide resin,
The heat-sensitive adhesive sheet according to claim 1 or 2, which is a resin composed of a single resin or a mixture selected from vinyl acetate resins. 4. The heat-sensitive adhesive sheet according to claim 1, wherein the information of a recording material having two or more information recording surfaces, or information recording surfaces of at least two information recording surfaces. An information recording body characterized by being sandwiched between recording surfaces and being heated to be integrated.