JP2010100715A - Adhesive sheet for screen printing, screen-printed adhesive sheet and method for producing screen-printed adhesive sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an adhesive sheet for screen printing using a polyolefin resin film as a base material and excellent in curling resistance, to provide a screen-printed adhesive sheet with a small amount of curl and a method for producing the same. <P>SOLUTION: The adhesive sheet 1 is obtained by stacking the base material 2, an adhesive layer 3 and a release material 4, wherein the base material 2 includes a polyolefin resin film as a principal layer and the product of a tensile modulus of elasticity E (MPa) of the base material 2 at 23°C and an average coefficient of linear expansion α (/°C) of the base material 2 obtained in a temperature range of 25-64°C when the ambient temperature of the base material 2 is raised at a rate of 5°C/min: E×α is 0-2.5×10<SP>-1</SP>(MPa/°C). <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a pressure-sensitive adhesive sheet for screen printing, a pressure-sensitive adhesive sheet formed by screen printing, and a method for producing the same.

  Adhesive sheets with screen printing (marking sheets affixed to vehicles such as automobiles and motorcycles, advertisement stickers affixed to signs, show windows, etc., signs, guidance displays, display labels used for warning displays, etc.) Screen printed adhesive sheets) are often used.

  Conventionally, as a base material for an adhesive sheet for screen printing (adhesive sheet for screen printing), a polychlorinated material having adhesion of screen ink, weather resistance, flexibility, and curling resistance at the time of heat drying after printing. Vinyl (PVC) resin films have been used.

  However, PVC resin films may be thermally decomposed during incineration to generate harmful gases such as hydrogen chloride.

In order to solve the above problems, various polyolefin resin films have been proposed (Patent Documents 1 to 5). Such a polyolefin resin film does not generate harmful gases such as hydrogen chloride when incinerated.
JP-A-8-157780 JP 2000-326408 A JP 2002-370328 A JP 2003-103725 A JP 2003-119442 A

  However, the conventional polyolefin resin film has a problem that the curl amount during heat drying after screen printing is large. In screen printing, where printing and drying are performed on a sheet, if the curl amount during heat drying is large, the printed layer comes into contact with the top plate of the drying rack, and the printed layer is peeled off. Also, alignment is difficult in multicolor printing. Such as becoming a problem.

  The present invention has been made in view of such a situation, and uses a polyolefin resin film as a base material and has excellent curling resistance, and a screen printing adhesive sheet with a small curl amount. And it aims at providing the manufacturing method.

In order to achieve the above object, first, the present invention is a pressure-sensitive adhesive sheet for screen printing comprising at least a base material, a pressure-sensitive adhesive layer, and a release material, wherein the base material is a polyolefin resin film. And the tensile modulus E (MPa) of the substrate at 23 ° C. and the ambient temperature of the substrate at 5 ° C./min. A product with an average linear expansion coefficient α (/ ° C.) obtained in the temperature region: E × α is 0 to 2.5 × 10 ⁻¹ (MPa / ° C.) (Invention 1)

  In this specification, “sheet” includes the concept of film, and “film” includes the concept of sheet.

  The pressure-sensitive adhesive sheet for screen printing according to the invention (Invention 1) has a curl amount small and excellent curl resistance even when the substrate is subjected to screen printing and heat-dried by satisfying the above conditions.

  In the said invention (invention 1), when the expansion-contraction of the said base material by the temperature change is restrained at the time of temperature rising or temperature falling of the said adhesive sheet for screen printing, the thermal stress (sigma) (MPa) which arises in the said base material Is preferably 9.8 or less (Invention 2).

  In the said invention (invention 1 and 2), it is preferable that the said base material is a lamination sheet by which an easily bonding layer is provided in the single side | surface or both surfaces of the polyolefin resin film (invention 3).

  In the said invention (invention 1-3), it is preferable that the polyolefin resin film of the said base material is a laminated | multilayer film which has a 3 layer structure (invention 4).

  In the said invention (invention 4), the intermediate | middle layer of the laminated | multilayer film which has the said 3 layer structure may contain a coloring agent (invention 5).

  In the said invention (invention 1-5), it is preferable that the polyolefin resin film of the said base material has a propylene component as a main component (invention 6).

  In the said invention (invention 1-6), it is preferable that the said peeling material is a release paper by which the resin layer was laminated | stacked on both surfaces of fine paper, and the peeling process was made | formed on the surface which touches the said adhesive layer (invention 7). .

In the above invention (Invention 7), the release paper has a basis weight of 130 g / m ² or more, a thickness of 140 μm or more, a moisture content of 3.0 to 7.0%, and a curl amount of 20 mm or less. The release paper is preferably (Invention 8).

  Secondly, the present invention provides a screen-printed pressure-sensitive adhesive sheet obtained by subjecting the substrate surface of the screen-printed pressure-sensitive adhesive sheet (Inventions 1 to 8) to screen printing (Invention 9).

  Thirdly, the present invention provides a method for producing a screen-printed pressure-sensitive adhesive sheet, wherein the substrate surface of the screen-printed pressure-sensitive adhesive sheet (Inventions 1 to 8) is subjected to screen printing and dried at 50 to 80 ° C. (Invention 10)

  The pressure-sensitive adhesive sheet for screen printing of the present invention has a small curl amount and excellent curl resistance even when screen-printed and heat-dried. Further, the screen-printed pressure-sensitive adhesive sheet of the present invention uses a polyolefin resin film as a substrate, but has a small curl amount. Furthermore, according to the manufacturing method of the screen printing adhesive sheet of this invention, a screen printing adhesive sheet with a small curl amount is obtained.

Hereinafter, embodiments of the present invention will be described.
FIG. 1 is a cross-sectional view of an adhesive sheet for screen printing (hereinafter simply referred to as “adhesive sheet”) 1 according to an embodiment of the present invention. As shown in FIG. 1, the pressure-sensitive adhesive sheet 1 according to this embodiment is formed by laminating a base material 2, a pressure-sensitive adhesive layer 3, and a release material 4. The release material 4 is peeled off when the pressure-sensitive adhesive sheet 1 is used.

The base material 2 has a tensile elastic modulus E (MPa) at 23 ° C. of the base material 2 and an atmospheric temperature of the base material 2 of 5 ° C./min. Product with average linear expansion coefficient α (/ ° C.) determined in the temperature range: E × α is 0 to 2.5 × 10 ⁻¹ (MPa / ° C.), preferably 0 to 1.0 × 10 ⁻¹ (MPa / ° C). In addition, the measuring method of the tensile elasticity modulus E and average linear expansion coefficient (alpha) is shown by the Example mentioned later.

When E × α of the base material 2 is 2.5 × 10 ⁻¹ (MPa / ° C.) or less, the base material 2 has a small amount of curl even if it is screen-printed and heat-dried. Thereby, the adhesive sheet 1 becomes excellent in curling resistance. The inventor of the present application has found that the curl resistance of the pressure-sensitive adhesive sheet 1 depends on E × α of the base material 2, and normally, the parameter of E × α is used for the physical properties of the pressure-sensitive adhesive sheet. Absent.

  In addition, the “curl amount” in the present specification refers to the maximum amount of floating amount at the four corners when a rectangular sheet is placed on a flat surface.

  When the expansion and contraction of the base material 2 due to a temperature change is restrained when the pressure-sensitive adhesive sheet 1 is heated or cooled, the thermal stress σ (MPa) generated inside the base material 2 is preferably 9.8 or less, particularly It is preferably 9.0 or less. The thermal stress σ (MPa) is expressed by E (MPa) × α (/ ° C.) × temperature difference ΔT (° C.). Further, “when the expansion and contraction of the base material 2 due to temperature change is restrained when the pressure-sensitive adhesive sheet 1 is heated or lowered” includes, for example, when the pressure-sensitive adhesive sheet 1 is subjected to screen printing and heat-dried. At this time, the base material 2 tends to expand and contract, but is restrained by the release material 4 via the pressure-sensitive adhesive layer 3, so that a thermal stress σ is generated inside the base material 2.

  Since the thermal stress σ generated inside the base material 2 is 9.8 or less, even if the temperature difference is large, the value of E × α is small, so the curl amount of the base material 2 is small, and the adhesive The excellent curl resistance of the sheet 1 is maintained.

  The base material 2 has a polyolefin resin film as a main layer, and may be composed of only a polyolefin resin film, or may be one in which another layer is laminated on a polyolefin resin film. Moreover, the laminated film in which the easily bonding layer (primer layer) for ink or adhesive adhesion | attachment may be provided in the single side | surface or both surfaces of the polyolefin-type resin film may be sufficient. Further, one or both surfaces of the polyolefin resin film may be subjected to surface treatment such as corona treatment or plasma treatment.

  The polyolefin-based resin film may be a single layer film or a multi-layer laminated film. The laminated film composed of a plurality of layers is preferably a co-extruded laminated film.

  When the polyolefin resin film is composed of a plurality of layers, each layer may be composed of the same material or different materials. The number of layers is preferably an odd number, and particularly preferably 3 layers. When the number of layers is an odd number, the physical properties of the polyolefin resin film are likely to be symmetrical in the thickness direction (vertical symmetry in FIG. 1), and curling is difficult to occur.

  As shown in FIG. 2, when the polyolefin resin film 20 has a three-layer structure, the polyolefin resin film 20 includes an outer layer 21 on the surface side of the pressure-sensitive adhesive sheet 1, an inner layer 23 on the pressure-sensitive adhesive layer 3 side, and an outer layer. 21 and an intermediate layer 22 sandwiched between the inner layer 23. When coloring the polyolefin resin film 20, it is preferable to add a colorant to the intermediate layer 22. By adopting such a configuration, the physical properties of the polyolefin-based resin film 20 are likely to be symmetrical in the thickness direction (vertically symmetrical in FIG. 2), and curling is unlikely to occur.

  The material constituting the polyolefin-based resin film is not particularly limited as long as E × α is a polyolefin-based resin (including a resin composition) that satisfies the above numerical range, but in the case of polyethylene or polypropylene alone, usually Does not meet the above numerical range. Usable polyolefin resins include, for example, homopolymers of olefins such as polyethylene and polypropylene; ethylene-propylene copolymers (ethylene component ≧ propylene component), propylene-ethylene copolymers (propylene component> ethylene component), etc. And a resin composition containing two or more components selected from ethylene-based thermoplastic elastomers and olefin-based thermoplastic elastomers such as propylene-based thermoplastic elastomers. The copolymer is preferably a random copolymer.

  Among the resin compositions, preferably, a mixture of 10 to 90 parts by mass of an ethylene-propylene copolymer and 90 to 10 parts by mass of a propylene-ethylene copolymer, 5 to 60 parts by mass of polypropylene, and a propylene-ethylene copolymer. A mixture of 5 to 90 parts by mass of the polymer and 5 to 90 parts by mass of the propylene-based thermoplastic elastomer can be used. These resin compositions have a propylene component as a main component. In the polypropylene resin having a propylene component as a main component, E × α and thermal stress σ easily satisfy the above numerical range.

  Although it does not specifically limit as a material of an easily bonding layer, For example, a polyester-type resin, a urethane type resin, a polyester urethane type resin, an acrylic resin etc. can be used. The thickness of the easily bonding layer is usually 0.005 to 10 μm, preferably about 0.01 to 5 μm.

  The thickness of the substrate 2 is preferably 20 to 300 μm, and particularly preferably 30 to 250 μm. When the thickness of the base material 2 is within such a range, the curl resistance effect by limiting the numerical value of E × α becomes more effective.

  The type of pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 3 is not particularly limited, and examples thereof include acrylic pressure-sensitive adhesives, polyester-based pressure-sensitive adhesives, polyurethane-based pressure-sensitive adhesives, rubber-based pressure-sensitive adhesives, and silicone-based pressure-sensitive adhesives. Can be mentioned. The pressure-sensitive adhesive may be any of an emulsion type, a solvent type, and a solventless type.

  The thickness of the pressure-sensitive adhesive layer 3 is usually 1 to 300 μm, preferably about 5 to 100 μm, but can be appropriately changed according to the application of the pressure-sensitive adhesive sheet 1. In addition, since the tensile elastic modulus E etc. are remarkably small compared with the base material 2, the adhesive layer 3 has little influence on the curl resistance of the adhesive sheet 1. FIG.

  The material of the release material 4 is, for example, a resin film made of a resin such as polyester such as polyethylene terephthalate, polypropylene, polyolefin such as polyethylene, or a release resin such as silicone resin, fluororesin, or long-chain alkyl group-containing carbamate. A release paper obtained by release treatment of paper such as glassine paper, clay-coated paper, and laminate paper with the above release agent can be used.

  Among them, a release paper (laminate paper) in which a resin layer made of polyethylene or the like is laminated on both surfaces of paper, particularly high-quality paper, and a release treatment is performed on the surface in contact with the pressure-sensitive adhesive layer 3 is used as the release material 4. Is preferred. The release paper is less likely to generate static electricity than the release paper that has been subjected to the release treatment, and has an advantage that it can be easily positioned when the pressure-sensitive adhesive sheet 1 is applied. In addition, by laminating the resin layers on both sides of the paper as described above, the physical properties of the release material 4 are likely to be symmetrical in the thickness direction (vertical symmetry in FIG. 1), and curling occurs in the release material 4 itself. It becomes difficult to do. Furthermore, since moisture in the paper is difficult to move to the outside, curling of the release material 4 due to a change in water content can be prevented.

The release paper has a paper weighing of 130 g / m ² or more, particularly 135 g / m ² or more, a paper thickness of 140 μm or more, particularly 145 μm or more, and a moisture content of the paper of 3.0 to 7.0. %, Particularly 3.5 to 6.5%, and the curl amount of the release paper is preferably 20 mm or less, particularly preferably 15 mm or less. When the release paper satisfies the above conditions, the excellent curl resistance of the pressure-sensitive adhesive sheet 1 is maintained.

  The thickness of the release material 4 is usually about 10 to 250 μm, preferably about 20 to 200 μm.

  The pressure-sensitive adhesive sheet 1 may be manufactured by a conventional method. For example, after the pressure-sensitive adhesive layer 3 is formed on the release surface (surface having peelability) of the release material 4, the base material 2 is formed on the surface of the pressure-sensitive adhesive layer 3. What is necessary is just to crimp. The pressure-sensitive adhesive layer 3 is prepared by preparing a coating agent containing a pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 3 and, if desired, a solvent, a roll coater, a knife coater, a roll knife coater, an air knife coater, a die coater, a bar coater, It can form by apply | coating to the peeling surface of the peeling material 4 with coating machines, such as a gravure coater and a curtain coater, and drying.

  Screen printing pressure sensitive adhesive sheet 5 as shown in Drawing 3 is obtained by performing screen printing on the surface of substrate 2 of pressure sensitive adhesive sheet 1 explained above, and drying by heating, preferably 50-80 ° C. This screen-printed pressure-sensitive adhesive sheet 5 is obtained by forming a screen-printed layer 6 on the surface of the base material 2 of the pressure-sensitive adhesive sheet 1. Screen printing may be performed by a conventional method.

As described above, since the adhesive sheet 1 has excellent curl resistance when E × α of the substrate 2 is 2.5 × 10 ⁻¹ (MPa / ° C.) or less, the adhesive sheet 1 The curl amount is small even when screen-printed and heat-dried as described above. Therefore, the obtained screen-printed adhesive sheet 5 has a small curl amount and a high flatness.

  The curl amount of the screen printing adhesive sheet 5 is preferably 15 mm or less, and particularly preferably 10 mm or less. When the curl amount exceeds 15 mm, it becomes difficult for the screen printing adhesive sheet 5 to be stuck at an accurate position. When the screen printing adhesive sheet 5 is stored in a rack for heating and drying, the screen printing layer 6 is not attached to the top plate. There is a risk that the screen printing layer 6 may peel off or collapse.

  In the said adhesive sheet 1, since the base material 2 makes a polyolefin-type resin film a main layer, unlike what consists of a PVC-type resin film, harmful gas, such as hydrogen chloride, does not generate | occur | produce when incinerated.

  The obtained screen printing adhesive sheet 5 is, for example, a marking sheet affixed to a vehicle such as an automobile or a motorcycle, an advertising sticker affixed to a signboard, a show window, a display label used for a sign, a guidance display, a warning display, etc. Can be used as such.

  EXAMPLES Hereinafter, although an Example etc. demonstrate this invention further more concretely, the scope of the present invention is not limited to these Examples etc.

[Example 1]
50 parts by mass of a propylene-ethylene random copolymer (random polypropylene) having a melting point of 138 ° C. and a flexural modulus of 700 MPa, and 50 parts by mass of an ethylene-propylene copolymer (multistage polymerization type polyolefin) having a melting point of 140 ° C. and a flexural modulus of 200 MPa, A resin composition was prepared by mixing 0.1 part by mass of a hindered amine light stabilizer (Ciba Specialty Chemicals, Kimasorb 944).

  Using the resin composition as a raw material, a transparent polyolefin-based resin film composed of a three-layer laminate having a thickness of 80 μm (layer thickness ratio: inner layer: intermediate layer: outer layer = 1: 6: 1) is obtained using a T-die extruder. Produced.

  After both sides of the obtained polyolefin resin film are corona-treated, a polyester urethane resin (X-2011, manufactured by Lintec Co., Ltd.) is applied to one surface with a Meyer bar so that the thickness after drying becomes 0.2 μm. And dried at 80 ° C. for 1.5 minutes to form an easy adhesion layer. The laminate thus obtained was used as a base material for a pressure-sensitive adhesive sheet for screen printing.

Release paper in which polyethylene layers are laminated on both sides of high-quality paper and one side is release-treated with a silicone resin release agent (manufactured by Oji Specialty Paper Co., Ltd., 12HL, weighing: 162 g / m ² , thickness: 174 μm, moisture content: 5 .2%, curl amount: 1 mm) on the release surface, an acrylic solvent-type adhesive (manufactured by Lintec Corporation, SK-1) was applied by a knife coater so that the thickness after drying was 35 μm, at 90 ° C. Dry for 1 minute.

  The base material was pressure-bonded to the pressure-sensitive adhesive layer thus formed, and this was used as a pressure-sensitive adhesive sheet for screen printing.

[Example 2]
In Example 1, a titanium oxide pigment was blended only in the intermediate layer of the polyolefin resin film (blending amount: 15 parts by mass) to obtain a white film having a concealment ratio of 90%. A pressure-sensitive adhesive sheet for screen printing was produced in the same manner as in Example 1 except that the obtained white polyolefin-based resin film was used as a base material.

Example 3
20 parts by mass of homopolypropylene having a melting point of 160 ° C. and a flexural modulus of 1400 MPa, 50 parts by mass of a propylene-ethylene random copolymer (random polypropylene) having a melting point of 138 ° C. and a flexural modulus of 700 MPa, and a low crystalline propylene having a melting point of 160 ° C. 30 parts by mass of a polymer (polyolefin-based thermoplastic elastomer, heat of crystal fusion ΔH: 50 g / J, flexural modulus: 500 MPa), hindered amine light stabilizer (manufactured by Ciba Specialty Chemicals, Kimasorb 944) 0.1 A resin composition mixed with parts by mass was prepared.

  Using the resin composition as a raw material, a polyolefin resin film composed of a three-layer laminate having a thickness of 100 μm (layer thickness ratio: inner layer: intermediate layer: outer layer = 1: 8: 1) was produced by a T-die extrusion molding machine. . At this time, a carbon black pigment was blended only in the intermediate layer (blending amount: 1.5 parts by mass), and the polyolefin resin film was black.

  After corona treatment on both sides of the resulting black polyolefin resin film, a Meyer bar is applied so that the polyester urethane resin (X-2011, manufactured by Lintec Co., Ltd.) is dried on one side to a thickness of 0.15 μm. And dried at 80 ° C. for 1.5 minutes to form an easy adhesion layer.

  A pressure-sensitive adhesive sheet for screen printing was produced in the same manner as in Example 1 except that the substrate thus obtained was used.

[Comparative Example 1]
A screen-printing pressure-sensitive adhesive sheet was prepared in the same manner as in Example 1 except that a white polyethylene resin film (manufactured by J Film Co., Ltd., PE Wadanyu Haku 70LF3 Chi 2PT, thickness: 70 μm) was used as the substrate.

[Comparative Example 2]
A screen printing adhesive sheet was prepared in the same manner as in Example 1 except that a transparent polypropylene resin film (manufactured by Oji Specialty Paper Co., Ltd., Alphan SD-101, thickness: 40 μm) was used as the substrate.

[Test example]
(1) Measurement of tensile modulus E MD (Machine Direction; flow direction when film is formed) and CD (Cross Direction; width direction when film is formed) of base materials used in Examples and Comparative Examples ), The tensile modulus E (MPa) at 23 ° C. was measured in accordance with JIS K7161 using a universal testing machine Tensilon. The sample size was 15 mm in width, 100 mm in length (= chuck distance), and the tensile speed was 200 mm / min. The results are shown in Table 1.

(2) Measurement of average linear expansion coefficient α For the MD and CD of the base material used in Examples and Comparative Examples, a thermomechanical analyzer (manufactured by Mac Science, TMA4000S) was used in accordance with JIS K7197. The average linear expansion coefficient α (/ ° C.) was measured as follows. The sample size is 4.5 mm wide and 15 mm long (= chuck distance), the sample is set in a thermomechanical analyzer, and it is lifted while applying a constant load of -2 gf (load of 2 gf in the tensile direction). The temperature was raised from 23 ° C. to 70 ° C. (as the ambient temperature) at a temperature rate of 5 ° C./min and held for 30 minutes. At this time, an average linear expansion coefficient α (1 / ° C.) obtained in a temperature range of 25 ° C. to 64 ° C. (as sample temperature) was measured. The results are shown in Table 1.

(3) Calculation of E × α and thermal stress σ Based on the measurement results of (1) and (2) above, E × α (MPa / ° C.) and thermal stress σ (MPa) were calculated. In addition, although thermal stress (sigma) is calculated | required by type | formula: Ex (alpha) x (DELTA) T, (DELTA) T was calculated as 39 degreeC (64 degreeC-25 degreeC).

(4) Measurement of curl amount The adhesive sheet for screen printing produced in Examples and Comparative Examples was cut into 210 mm × 297 mm, and this sample was set in a rack for screen printing drying so that the release paper was on the lower side. And left for 30 minutes under heat drying at 60 ° C.

  Thereafter, the sample was taken out of the rack and left at room temperature (23 ° C.) for 60 minutes with the release paper facing down. Next, the sample was transferred to a flat table with the release paper facing down, and the maximum lift (curl amount) from the table surface at the four corners of the sample was measured. The results are shown in Table 1.

  In addition, since the screen printing layer hardly affects the curl amount of the pressure-sensitive adhesive sheet, in this measurement, the pressure-sensitive adhesive sheet in a state where screen printing was not performed was used as a measurement target.

As can be seen from Table 1, the pressure-sensitive adhesive sheet for screen printing using a substrate having E × α of 2.5 × 10 ⁻¹ or less (and thermal stress σ of 9.8 or less) has a curl amount of 5 mm. It was as small as below.

  The pressure-sensitive adhesive sheet for screen printing of the present invention is preferably used for screen printing applications that have troubles in printing and drying when the curl during heat drying is large.

It is sectional drawing of the adhesive sheet for screen printing which concerns on one Embodiment of this invention. It is sectional drawing of the polyolefin-type resin film which has a 3 layer structure. It is sectional drawing of the screen printing adhesive sheet which concerns on one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Screen-printing adhesive sheet 2 ... Base material 20 ... Polyolefin resin film 21 ... Outer layer 22 ... Intermediate layer 23 ... Inner layer 3 ... Adhesive layer 4 ... Release material 5 ... Screen-printing adhesive sheet 6 ... Screen-printing layer

Claims (10)

At least a pressure-sensitive adhesive sheet for screen printing comprising a substrate, a pressure-sensitive adhesive layer, and a release material,
The base material has a polyolefin resin film as a main layer, and when the base material is heated at a tensile elastic modulus E (MPa) at 23 ° C. and an atmospheric temperature of the base material at 5 ° C./min, Product with average linear expansion coefficient α (/ ° C.) obtained in the temperature range of 25 ° C. to 64 ° C. of the substrate: E × α is 0 to 2.5 × 10 ⁻¹ (MPa / ° C.) An adhesive sheet for screen printing.   The thermal stress σ (MPa) generated inside the base material when the expansion and contraction of the base material due to temperature change is restrained when the temperature of the pressure sensitive adhesive sheet for screen printing is raised or lowered is 9.8 or less. The pressure-sensitive adhesive sheet for screen printing according to claim 1.   The pressure-sensitive adhesive sheet for screen printing according to claim 1 or 2, wherein the base material is a laminated sheet in which an easy-adhesion layer is provided on one side or both sides of a polyolefin resin film.   The pressure-sensitive adhesive sheet for screen printing according to any one of claims 1 to 3, wherein the polyolefin-based resin film of the base material is a laminated film having a three-layer structure.   The pressure-sensitive adhesive sheet for screen printing according to claim 4, wherein the intermediate layer of the laminated film having the three-layer structure contains a colorant.   The pressure-sensitive adhesive sheet for screen printing according to claim 1, wherein the polyolefin-based resin film of the base material contains a propylene component as a main component.   The screen according to any one of claims 1 to 6, wherein the release material is a release paper in which a resin layer is laminated on both surfaces of a high-quality paper and a release treatment is performed on a surface in contact with the pressure-sensitive adhesive layer. Printing adhesive sheet. The release paper is a release paper having a basis weight of 130 g / m ² or more, a thickness of 140 μm or more, a moisture content of 3.0 to 7.0%, and a curl amount of 20 mm or less. The pressure-sensitive adhesive sheet for screen printing according to claim 7.   A screen-printed pressure-sensitive adhesive sheet obtained by subjecting the substrate surface of the screen-printed pressure-sensitive adhesive sheet according to claim 1 to screen printing.   A method for producing a screen-printed pressure-sensitive adhesive sheet, comprising subjecting the surface of the pressure-sensitive adhesive sheet for screen printing according to any one of claims 1 to 8 to screen printing and drying at 50 to 80 ° C.

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