JP2001131498A - Adhesive sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adhesive sheet which does not curl and is suitable for litho printing. SOLUTION: In the adhesive sheet comprising laminating a surface base, an adhesive layer and a release base, the adhesive sheet is characterized in that, according to a shear adhesive power test (JIS Z 0237 reference column 3), a sheet that the release base is removed from the adhesive sheet is used as a test piece, and the removed release base is used as a test board, when the test piece is stretched at a rate of 0.5 mm/sec by a tensile strength tester, a slide occurs between the adhesive and the release base.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure-sensitive adhesive sheet using films and papers as a surface substrate, and more particularly to a pressure-sensitive adhesive sheet which is free of curl and suitable for plain printing.

[0002]

2. Description of the Related Art Conventionally, adhesive sheets have been used for labels, seals,
It is used for a wide range of applications such as commercial use, office use, and home use, such as stickers, patches, and overlamps. This pressure-sensitive adhesive sheet is generally formed by laminating a surface substrate, a pressure-sensitive adhesive, and release paper. Adhesives include rubber-based, acrylic, vinyl ether-based solvent-based adhesives,
Emulsion type adhesives, hot melt type adhesives and the like are used.

Examples of the surface substrate include general papers such as high quality paper, kraft paper, art paper, coated paper, cast coated paper, etc., thermal recording materials, thermal transfer image receiving sheets, recording sheets such as ink jet recording sheets, and aluminum foil. Lami paper, aluminum evaporated paper,
Special papers such as resin-impregnated paper and synthetic paper, and films such as PET, polypropylene, and polyvinyl chloride are used.
Among them, films are used for adhesive sheets for overlaminating or outdoor use because they have higher durability than papers for other surface base materials, and also have extremely high gloss and high-grade feel. Posters and stickers for lighting
Used for pressure-sensitive adhesive sheets for printing such as L labels.

As a release substrate, polyethylene laminated paper, glassine paper, clay-coated paper, water-based resin-coated paper or a film such as PET or polypropylene is used as a release base paper, and a silicone compound or a fluorine compound is provided on the side in contact with the adhesive. It is used by applying a release agent such as

Usually, when producing a pressure-sensitive adhesive sheet, the above-mentioned surface base material and pressure-sensitive adhesive are selected according to the intended use, and the combination of the surface base material and the pressure-sensitive adhesive and the printing process, labeling work, etc. A release base paper and a release agent are selected according to the workability in the process, and the adhesive sheet is manufactured so as to be an adhesive sheet having excellent workability. Therefore, in many cases, the pressure-sensitive adhesive sheet is formed by laminating two types of materials having different properties, such as a surface substrate and a release substrate. Such a pressure-sensitive adhesive sheet often curls after a certain period of time has passed after production. When curling occurs in the pressure-sensitive adhesive sheet, workability such as post-processing, for example, a printing process and a label attaching operation, is significantly reduced.

As a cause of such curling, two kinds of sheets made of different materials are laminated, so that the temperature,
Due to the bimetallic action caused by environmental changes such as humidity, or the change in tension in the lamination process between the surface substrate and the release substrate during processing of the adhesive sheet, the winding habit generated when winding after processing, or these phenomena Many are due to combined effects.

Conventionally, in order to prevent such curling, a method has been adopted in which the characteristics of the materials to be bonded to each other with respect to temperature, humidity, and the like are made the same. In addition, as for the correction of curl due to a change in tension at the time of manufacturing, Japanese Patent Publication No. 1-3226
As disclosed in Japanese Patent Application Laid-Open No. 8 (1996) -1994, it has been proposed to once peel off the surface substrate and the release substrate and re-bond them. However, even this method does not solve the curl due to the bimetal action caused by environmental changes such as temperature and humidity.

[0008] In particular, in the case of performing plain-format printing, if there is a curl, workability is remarkably deteriorated. In the case of a pressure-sensitive adhesive sheet using a film or synthetic paper as a surface substrate for plain printing, polyethylene laminated paper is generally used as a release base paper in order to reduce the bimetal effect described above. That is, when the surface substrate is a film or a synthetic paper, dimensional change hardly occurs with a change in humidity, while paper made of pulp has a large dimensional change with a change in humidity. For this reason, a pressure-sensitive adhesive sheet laminated with a release substrate consisting of films and paper causes a dimensional difference between the front and back due to a change in humidity, which causes curling.However, humidity changes due to curling due to humidity changes as much as possible As a result, polyethylene laminated paper is selected as the release base paper having a small dimensional change. However, despite the polyethylene laminated paper, the dimensional change due to the change in humidity is not eliminated, but the speed of the dimensional change is merely reduced. Therefore, if left for a long time in an environment of different humidity, dimensional changes gradually occur, and as a result, curling due to the bimetal effect may occur.

Further, when the surface substrate is a film or synthetic paper, the dimensional change due to a temperature change is greater than that of paper.
It also causes curling due to the bimetal effect. In particular, in the winter period, printing troubles often occur due to curling caused by shrinkage of the surface base material in a plain adhesive sheet using a film or synthetic paper as the surface base material. Therefore, when printing a pressure-sensitive adhesive sheet using a film or synthetic paper on the surface substrate, not only using a release substrate using polyethylene laminated paper as the release base paper, but also storing it in an environment with little temperature and humidity changes However, there is no effective solution other than performing printing under a certain environment.

[0010]

SUMMARY OF THE INVENTION An object of the present invention is to provide a pressure-sensitive adhesive sheet suitable for plain-format printing which does not cause curl due to environmental changes.

[0011]

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, have caused a shift between the release surface of the release substrate and the pressure-sensitive adhesive layer. Even if there is a dimensional difference between the surface substrate and the release substrate due to the above, the deviation between the surface substrate and the release substrate is reduced to reduce the dimensional difference and prevent the occurrence of curl due to environmental change The inventors have found that the present invention can be performed, and have completed the present invention.

(1) That is, the present invention provides a pressure-sensitive adhesive sheet having a surface substrate, a pressure-sensitive adhesive layer, and a release substrate laminated thereon, as a test piece according to a shear adhesion test (3 in the reference column of JIS Z 0237). When the test piece was pulled at a rate of 0.5 mm / min with a tensile tester using a sheet from which the release base material of the pressure-sensitive adhesive sheet was removed, and using the release base material removed as a test plate, the adhesive and the release base were removed. A pressure-sensitive adhesive sheet characterized by slippage between materials.

(2) Further, the present invention provides a pressure-sensitive adhesive sheet having a surface substrate, a pressure-sensitive adhesive layer, and a release substrate laminated thereon, as a test piece according to a shear adhesion test (3 in Reference column of JIS Z 0237). Using the sheet from which the release base material of the adhesive sheet was removed, and using the release base material removed as a test plate, the test piece was pulled at a rate of 0.5 mm per minute by a tensile tester, and represented by the following formula. Shear adhesive strength (S) is 0.
A pressure-sensitive adhesive sheet having a pressure of 5 to 2.5 N / cm ² . S = P / A In the formula, S: shear adhesive force (N / cm ² ) P: maximum load (N) A: shear area of test piece (cm ² )

(3) The present invention further provides a pressure-sensitive adhesive sheet having a surface substrate, a pressure-sensitive adhesive layer, and a release substrate laminated thereon, wherein the release substrate is removed from the pressure-sensitive adhesive sheet, and the release substrate is used for shearing. A test piece (according to the description in section 8.2 of JIS K6833) was prepared, and the shear test piece was suspended and fixed.
A pressure-sensitive adhesive sheet characterized in that a shift occurs between the pressure-sensitive adhesive and the release substrate when a constant load of 0.15 N is applied to a shear area of 1 cm ² in an environment of 23 ° C. and 50% RH. It is.

(4) The present invention further provides a pressure-sensitive adhesive sheet having a surface substrate, a pressure-sensitive adhesive layer, and a release substrate laminated thereon, wherein the release substrate of the pressure-sensitive adhesive sheet is removed, and the release substrate is used. A shear test piece (according to the description in section 8.2 of JIS K6833) was prepared, the shear test piece was suspended and fixed, and the shear area was 1 cm in an environment of 23 ° C. and 50% RH.
^When a constant load of 0.15N was applied to 2 and left for 1 hour, the displacement between the adhesive and the release substrate was 0.05
A pressure-sensitive adhesive sheet characterized in that the pressure-sensitive adhesive sheet has a thickness of about 0.5 mm.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention provides the above (1), (2),
By satisfying at least one of (3) and (4), it is possible to cause a shift between the release surface of the release substrate and the pressure-sensitive adhesive layer, and to reduce the difference between the surface substrate and the release substrate due to environmental changes. The pressure-sensitive adhesive sheet is characterized in that curling due to environmental change is prevented by relaxing the dimensional difference.

In general, when a dimensional change occurs in either the surface substrate or the release substrate of the pressure-sensitive adhesive sheet due to an environmental change, or when a dimensional change of a different amount occurs in both, the pressure-sensitive adhesive sheet Curls. If the dimensional change is reversible, the curl due to such bimetal action can be eliminated by returning to the original environment, but it is difficult to return to the original environment due to climate, weather, etc. There are many. If the dimensional change is irreversible, it is difficult to eliminate the curl even if the environment is restored.

(1) In the first invention, in the pressure-sensitive adhesive sheet, reference is made to JIS Z 0237 (Testing method for pressure-sensitive adhesive tape / pressure-sensitive adhesive sheet), 3 in the column of “Reference (supplement on the definition of main body)”
According to the method of the shear adhesion test described in the above, using a sheet from which the release substrate of the pressure-sensitive adhesive sheet was removed as a test piece, and using the release substrate removed as a test plate, using a tensile tester, this test piece When slippage occurs between the pressure-sensitive adhesive and the release substrate when pulled at an extremely low speed of 0.5 mm per minute, in the pressure-sensitive adhesive sheet, even if the pressure-sensitive adhesive sheet curls, it takes several minutes to several hours. The dimensional difference between the surface substrate and the release substrate is reduced, and the curl disappears.

(2) The second invention relates to a pressure-sensitive adhesive sheet, which is described in JIS Z 0237 (Testing method for pressure-sensitive adhesive tape / pressure-sensitive adhesive sheet).
According to the method of the shear adhesion test described in the above, using a sheet from which the release substrate of the pressure-sensitive adhesive sheet was removed as a test piece, and using the release substrate removed as a test plate, using a tensile tester, this test piece When the shear adhesive force S represented by the following formula is in the range of 0.5 to 2.5 N / cm ² when pulled at an extremely low speed of 0.5 mm per minute, the adhesive sheet curls. Even in a few minutes to several hours, the dimensional difference between the surface substrate and the release substrate is reduced, and the curl disappears. S = P / A In the formula, S: shear adhesive strength (N / cm ² ) P: maximum load (N) A: shear area (cm ² ) of test piece Incidentally, shear adhesive strength S is 0.5 N / cm ^2. If less than this, when an unintended force is applied, the surface base material and the release base material may easily shift to cause trouble. On the other hand, if the shear adhesive strength S exceeds ^2.5 N / cm ² , the desired effect may not be obtained.

(3) In the third invention, a shear test piece described in 8.2 (softening temperature) of JIS K 6833 (General Test Method for Adhesives) is prepared on an adhesive sheet. Using the sheet from which the release substrate of the adhesive sheet has been removed and the release substrate from which the release has been removed, a part of the sheets is overlapped to form a straight test piece, and a shear test piece is prepared (FIG. 4 of JIS K6833). Fix this hanging up,
A constant load of 0.15 N is applied to a shear area of 1 cm ² in an environment of 23 ° C. and 50% RH (JIS K683).
3 FIG. 8). At this time, in the pressure-sensitive adhesive sheet in which a gap between the pressure-sensitive adhesive and the release substrate occurs, even if the pressure-sensitive adhesive sheet is curled, the dimensional difference between the surface substrate and the release substrate is reduced in several minutes to several hours, and the curl disappears. .

(4) The fourth invention provides a pressure-sensitive adhesive sheet with a shear test piece (JIS K) as in the third invention.
6833), a shear test specimen was suspended and fixed, and a constant load of 0.15 N was applied to a shear area of 1 cm ² in an environment of 23 ° C. and 50% RH. When the pressure-sensitive adhesive and the release substrate are displaced from each other by 0.05 to 0.5 mm when left for 1 hour, even if the pressure-sensitive adhesive sheet is curled, the surface substrate and the release substrate And the curl disappears. Incidentally, if the deviation is less than 0.05 mm, the desired effect may not be obtained. On the other hand, when the deviation exceeds 0.5 mm, when an unintended force is applied, the surface substrate and the release substrate may easily shift to cause a trouble.

In order to cause a shift between the pressure-sensitive adhesive and the release substrate, it is necessary to satisfy at least one of the above (1), (2), (3) and (4). Can be solved by selecting an adhesive and a release substrate. Among them, it was found that the influence of the release substrate was larger than that of the adhesive.

The release base material used in the present invention includes a kinetic friction coefficient (rubber is viscoelasticity) measured at a movement speed of 0.5 to 1.0 mm / min with respect to a release surface and a rubber having a Shore A hardness of 65 ± 5 °. , The frictional force has a speed dependency) is preferably in the range of 0.01 to 0.2.
When the coefficient of kinetic friction is less than 0.01, when an unintended force is applied, the surface base material and the release base material may easily shift to cause trouble. On the other hand, the coefficient of kinetic friction is 0.2
If the number exceeds, the desired effect may not be obtained.

As the release base paper used in the present invention, polyethylene laminated paper, glassine paper, clay coated paper,
Water-based resin-coated paper and films such as PET and polypropylene can be used. The release agent is not particularly limited as long as the kinetic friction coefficient after application of the release agent to the release base paper is within the above range, and may be an emulsion type, a solvent type, or a solventless type silicone compound or a fluorine compound. Can be used. These release agents may be used alone, but a lubricant such as silicone oil may be added so that the kinetic friction coefficient falls within the above range.

Usually, the amount of the release agent applied to the release base paper varies depending on the type of the release agent, but it is necessary to apply the kinetic friction coefficient in the above range. Usually, it is applied in the range of 0.1 to 10 g / m ² in terms of solid content weight. 0.
If the amount is less than 1 g / m ² , the desired effect may not be obtained. If the amount exceeds 10 g / m ² , the surface substrate and the release substrate are easily displaced when an unintended force is applied. In some cases, the effect may be saturated and uneconomical. When a lubricant is added, it depends on the type of lubricant. For example, in the case of silicone oil, it is preferable to add about 0.01 to 1.0 part by weight to 100 parts by weight of the solid content of the release agent.

With respect to the pressure-sensitive adhesive used in the present invention, when combined with a release substrate, the pressure-sensitive adhesive described in (1), (2),
There is no particular limitation as long as at least one of (3) and (4) is satisfied. For example, an acrylic pressure-sensitive adhesive obtained by copolymerizing acrylic acid, methacrylic acid, acrylamide, vinyl acetate, styrene, etc. mainly with an acrylate ester And natural rubber, synthetic rubber, recycled rubber silicone type, styrene-butadiene copolymer, styrene-isoprene block copolymer, and other adhesives. These adhesives are solvent-based, aqueous emulsion-based, hot melt-based, A liquid curable type or the like can be used, but the composition and form of the pressure-sensitive adhesive are not particularly limited. In the case where a slight displacement hardly occurs with only the release base material, it is preferable to use a two-component curable adhesive. In addition,
In the pressure-sensitive adhesive layer, the above (1), (2), (3), (4)
As long as at least one of the above is satisfied, an auxiliary agent such as a tackifier, a cross-linking agent, a pigment, a colorant, an ultraviolet absorber, or an antistatic agent may be blended.

The surface substrate used in the present invention may be a high quality paper,
General papers such as kraft paper, art paper, coated paper, cast-coated paper, special papers such as resin-impregnated paper and synthetic paper, films such as polyester (eg PET), polyolefin (eg polypropylene), polyvinyl chloride, etc. Non-woven fabrics and the like, laminates of these, and thermal recording media having a recording layer formed on these base materials, thermal transfer image receiving sheets, recording sheets such as ink jet recording sheets, etc., metallized aluminum-deposited paper, aluminum-deposited films Metal-deposited sheets, such as metal foil-laminated paper (for example, aluminum foil-laminated paper), etc. can be used, and although not specified, the effects of the present invention can be applied to films or synthetic paper whose dimensional changes are remarkable due to temperature changes. Is big.

[0028]

The present invention will be described in more detail with reference to the following Examples, but it should be understood that the present invention is by no means restricted thereto. In each example, "part" and "%"
Means "part by weight of solid content" and "% by weight of solid content", respectively, unless otherwise specified.

Example 1 [Production of release substrate] A silicone solution having the following composition was prepared. -4.5 parts of addition reaction type silicone (trade name: SD7220, manufactured by Toray)-0.5 parts of platinum catalyst (trade name: SRX212, manufactured by Toray)-95 parts of toluene-Silicone oil (trade name: KF96, Shin-Etsu) 0.03 parts The obtained solution was applied to one side of a high-quality paper of 110 g / m ² polyethylene-laminated on both sides with a Meyer bar so that the weight after drying was 4.0 g / m ^2. Work was performed to obtain a release substrate. Release surface of obtained release substrate and Shore A
The coefficient of kinetic friction measured at a moving speed of 1.0 mm / min against a rubber having a hardness of 65 ° was 0.04.

[Production of pressure-sensitive adhesive sheet] An acrylic solvent-type pressure-sensitive adhesive (trade name: Nissetsu KP-195) is applied to the release substrate.
4, 100 parts by Nippon Carbide Co., Ltd., curing agent (trade name:
(Nissetsu D-201) 1.5 parts was coated and dried with a reverse roll coater at a line speed of 50 m / min and a coating amount of 25 g / m ² . Then, a synthetic paper (trade name: YUPO SGS80, manufactured by Oji Yuka Synthetic Paper Co., Ltd.) was attached as a surface base material to obtain an adhesive sheet.

Example 2 The same procedure as in Example 1 was carried out except that the addition amount of the silicone oil was 0.0005 parts and the coating amount of the release agent was 0.5 g / m ² , An adhesive sheet was obtained.
At this time, the coefficient of kinetic friction measured at a movement speed of 1.0 mm / min between the peeled surface of the peeled substrate and rubber having a Shore A hardness of 65 ° was 0.18.

Comparative Example 1 The addition reaction type silicone of Example 1 (trade name: SD722)
0, manufactured by Toray Industries, Inc. with addition reaction type silicone (trade name: SD)
7223, manufactured by Toray Industries Inc.), and a release substrate and an adhesive sheet were obtained in the same manner as in Example 1 except that no silicone oil was further added. At this time, the coefficient of kinetic friction measured at a movement speed of 1.0 mm / min between the peeled surface of the peeled substrate and rubber having a Shore A hardness of 65 ° was 0.10.

[Evaluation] [Measurement of slip and shear adhesion in low-speed tension]
The pressure-sensitive adhesive sheets obtained in Examples 1 and 2 and Comparative Example 1 were JIS
Z 0237 (Testing method for adhesive tape / adhesive sheet)
The following measurement was carried out according to the method of the shear adhesion test described in 3 of Reference (Supplement on the definition of the main body). As a test piece, a sheet obtained by removing a release base material from an adhesive sheet was used, and the removed release base material was used in place of a test plate. This was set in a tensile tester (RTC-1210, manufactured by Orientec), and was set to 0 / min. It was measured whether or not slippage occurred between the pressure-sensitive adhesive and the release substrate when the film was pulled at a speed of 0.5 mm, and the shear adhesive force at that time was measured.

[Curl due to environmental change]
The pressure-sensitive adhesive sheet obtained in Comparative Example 1 was 200 mm × 200 m
m, cut into 100 sheets, wrapped in 100 sheets each with moisture-proof paper, left in an environment of 23 ° C / 50% RH for 24 hours, and then left in an environment of 5 ° C / 20% RH for 1 hour. The package was opened and the degree of curl was evaluated according to the following criteria. (Curl evaluation method and evaluation criteria) 200 mm × 20
Place the above treated sample of 0 mm size on a flat sample base with the curled side up, measure how much the four corners of the sample float from the sample base, determine the average value, and determine the average Was evaluated. ◎: 0 mm ○: More than 0 mm and 5 mm or less △: More than 5 mm and 10 mm or less ×: More than 10 mm

[0035]

[Table 1]

As is clear from the results in Table 1, when slippage occurs between the pressure-sensitive adhesive and the release base material, even if the base material shrinks by changing the environment, the slippage is alleviated by the slippage, so that curling due to the bimetal action does not occur. . On the other hand, in the case where no slippage occurs between the pressure-sensitive adhesive and the release base material as in the comparative example, the base material shrinks in accordance with an environmental change, and the expansion and contraction cannot be alleviated due to a shift, thereby causing curling.

Example 3 The addition reaction type silicone of Example 1 (trade name: SD722)
0, manufactured by Toray Industries, Inc. with addition reaction type silicone (trade name: SD)
7223, manufactured by Toray Industries, Inc.), and a release substrate and a pressure-sensitive adhesive sheet were obtained in the same manner as in Example 1 except that the addition amount of the silicone oil was changed to 0.04 part. At this time, the coefficient of kinetic friction measured at a movement speed of 1.0 mm / min between the peeled surface of the peeled substrate and the rubber having a Shore A hardness of 65 ° was 0.
42.

Example 4 The same procedures as in Example 3 were carried out except that the addition amount of the silicone oil was 0.001 part and the coating amount of the release agent was 6 g / m ² , and the release base material and the release agent were used. Thus, an adhesive sheet was obtained.
At this time, the coefficient of kinetic friction measured at a movement speed of 1.0 mm / min between the peeled surface of the peeled substrate and rubber having a Shore A hardness of 65 ° was 0.18.

Comparative Example 2 The addition reaction type silicone of Example 3 was used (trade name: SD72).
23, manufactured by Toray Industries Co., Ltd.
D7330, manufactured by Toray Industries Inc.), and a release substrate and a pressure-sensitive adhesive sheet were obtained in the same manner as in Example 3 except that no silicone oil was further added. At this time, the coefficient of kinetic friction measured at a movement speed of 1.0 mm / min between the peeled surface of the peeled substrate and rubber having a Shore A hardness of 65 ° was 0.45.

[Evaluation] [Shift after 1 hour due to constant load] The pressure-sensitive adhesive sheets obtained in Examples 3 and 4 and Comparative Example 2 were used. A sheet from which the release substrate was removed from the pressure-sensitive adhesive sheet and a shear test piece (according to JIS K6833, section 8.2) were prepared from the removed release substrate. Using a thermal expansion tester (TMA8310, manufactured by Rigaku Corporation), the shear test piece was suspended and fixed.
In an environment of 50 ° C. and 50% RH, if a constant load of 0.15 N is applied to a shearing area of 1 cm ² and then left for 1 hour, a shift occurs between the adhesive and the release substrate. And the width of the deviation at that time were measured.

[Curl due to Environmental Change]
The pressure-sensitive adhesive sheet obtained in Comparative Example 2 was 200 mm × 200 m
m, cut into 100 sheets, wrapped in 100 sheets each with moisture-proof paper, left in an environment of 23 ° C / 50% RH for 24 hours, and then left in an environment of 5 ° C / 20% RH for 1 hour. The package was opened and the degree of curl was evaluated according to the following criteria. (Curl evaluation method and evaluation criteria) 200 mm × 20
Place the above treated sample of 0 mm size on a flat sample base with the curled side up, measure how much the four corners of the sample float from the sample base, determine the average value, and determine the average Was evaluated. ◎: 0 mm ○: More than 0 mm and 5 mm or less △: More than 5 mm and 10 mm or less ×: More than 10 mm

[0042]

[Table 2]

As is clear from the results in Table 2, if the pressure-sensitive adhesive and the release base material are displaced, even if the base material shrinks by changing the environment, the displacement is mitigated by the dislocation, so that the curl due to the bimetal action does not occur. . On the other hand, in the case where no displacement occurs between the pressure-sensitive adhesive and the release substrate as in the comparative example, the substrate shrinks in response to an environmental change, and the expansion and contraction cannot be alleviated due to the displacement, thereby causing curl.

[0044]

As described above, the present invention is an excellent pressure-sensitive adhesive sheet which is free from curling due to shrinkage of a film or synthetic paper which is a surface substrate frequently occurring in winter. Further, it is an excellent pressure-sensitive adhesive sheet in which curling due to shrinkage of a film or synthetic paper due to heat during printing or recording does not occur.

Claims (4)

[Claims] A pressure-sensitive adhesive sheet having a surface substrate, a pressure-sensitive adhesive layer, and a release substrate laminated thereon is subjected to a shear adhesion test (JIS Z).
According to 3) in Reference column of 0237, a sheet from which the release base material of the pressure-sensitive adhesive sheet was removed was used as a test piece, and the release base material that was removed as a test plate was used. A pressure-sensitive adhesive sheet characterized in that a slip occurs between the pressure-sensitive adhesive and the release substrate when pulled at a speed of 0.5 mm. 2. A shear adhesive strength test (JIS Z) for an adhesive sheet in which a surface substrate, an adhesive layer and a release substrate are laminated.
According to 3) in Reference column of 0237, a sheet from which the release base material of the pressure-sensitive adhesive sheet was removed was used as a test piece, and the release base material that was removed as a test plate was used. An adhesive sheet characterized by having a shear adhesive force (S) expressed by the following formula when it is pulled at a speed of 0.5 mm, from 0.5 to 2.5 N / cm ² . S = P / A In the formula, S: shear adhesive force (N / cm ² ) P: maximum load (N) A: shear area of test piece (cm ² ) 3. A pressure-sensitive adhesive sheet in which a surface substrate, a pressure-sensitive adhesive layer and a release substrate are laminated, and a sheet obtained by removing the release substrate from the pressure-sensitive adhesive sheet, and a shear test piece (JI
SK6833), a shear test piece was suspended and fixed, and a constant load of 0.15 N was applied to a shear area of 1 cm ² in an environment of 23 ° C. and 50% RH. A pressure-sensitive adhesive sheet characterized in that a shift occurs between the pressure-sensitive adhesive and the release substrate when applied. 4. A pressure-sensitive adhesive sheet having a surface substrate, a pressure-sensitive adhesive layer and a release substrate laminated thereon, and a sheet obtained by removing the release substrate from the pressure-sensitive adhesive sheet and a shear test piece (JI
SK6833), a shear test piece was suspended and fixed, and a constant load of 0.15 N was applied to a shear area of 1 cm ² in an environment of 23 ° C. and 50% RH. A pressure-sensitive adhesive sheet characterized in that, when left for 1 hour, a deviation of 0.05 to 0.5 mm occurs between the pressure-sensitive adhesive and the release substrate.