JP2008239681A - Adhesive sheet and adhesive sheet with face sheet - Google Patents

Abstract

The present invention provides an adhesive sheet in which powder-off of an adhesive layer is prevented. Moreover, the adhesive sheet with a surface sheet in which an adhesive bond layer has desired adhesiveness is provided.
An adhesive sheet 1a of the present invention has an adhesive substrate 10 and a release substrate 20, and the adhesive substrate 10 is one of an adhesive substrate support 11 and an adhesive substrate support 11. A pressure-sensitive adhesive layer 12 provided on the surface and containing an adhesive force control agent; and a pressure-sensitive adhesive layer 13 provided on the other surface of the adhesive substrate support 11 and adjacent to the release substrate 20. The release substrate 20 is impregnated or coated with a treatment liquid containing an antistatic agent on the surface opposite to the adhesive substrate 10 side. The adhesive sheet 1 with a surface sheet of the present invention includes the above-described adhesive sheet 1a and a surface sheet 1b that is detachably bonded to a part or all of the pressure-sensitive adhesive layer 12 of the adhesive sheet 1a.
[Selection] Figure 3

Description

  The present invention relates to an adhesive sheet used for a delivery slip sticker and the like, and an adhesive sheet with a surface sheet used for a delivery slip.

In general, parcels and postal items (hereinafter referred to as “packages”) are delivered by pasting a delivery slip on which delivery address information, delivery information such as name, sender information, and product name are printed. . As a delivery slip, Patent Document 1 includes a delivery slip that is releasably adhered to a sticker slip, and the sticker slip includes a base structure and an adhesive layer for sticking the delivery slip to a package or the like. It is disclosed.
When delivering a package or the like using this delivery slip, delivery destination information is printed on the front surface of the delivery slip, and the back surface of the base structure is attached to the package or the like with an adhesive layer. The delivery person delivers the package to the delivery destination based on the delivery destination information printed on the delivery slip, and after receiving the receipt confirmation or signature on the delivery slip at the delivery destination, the delivery slip is removed from the base structure. And collect.

The delivery slip is manufactured as follows, for example. That is, first, an adhesive layer is provided on one side of a base structure such as paper so that the delivery slip can be peeled off, and an adhesive layer is provided on the other side for attaching to a package or the like. An adhesive substrate is prepared. Here, as the adhesive constituting the adhesive layer, for example, a pseudo-adhesive or a pressure-sensitive adhesive containing an adhesive force control agent is used. Subsequently, a peeling base material is bonded together to the adhesive layer of an adhesive base material, and a sticker is produced. In addition, a delivery slip is produced by printing on a substrate such as paper. Then, a delivery slip is obtained by pasting the delivery slip on the adhesive layer of the sticker slip.
JP 2003-13016 A

By the way, in the delivery slip manufacturing method, the place where the sticker is prepared may be different from the place where the sticker and the delivery slip are pasted. Therefore, the sticker may be wound while laminating an adhesive layer on a release substrate, and may be stored and transported in the form of a roll-shaped raw fabric.
However, when a pressure-sensitive adhesive is used for the adhesive layer, a part of the adhesive layer remains attached to the release substrate when the sticker is fed out of the original fabric to bond the delivery slip. In some cases, the adhesive layer peeled off. Further, when the pasted sticker slip comes into contact with the traveling roll, a part of the adhesive layer may peel off and adhere to the traveling roll. When powder falling, which is a phenomenon in which a part of the adhesive layer is peeled off, the adhesive layer becomes difficult to exhibit a desired adhesive property, and the traveling roll is contaminated. Therefore, prevention of powder falling has been demanded.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an adhesive sheet that prevents powder from falling off an adhesive layer and can be suitably used for applications such as stickers. It is another object of the present invention to provide an adhesive sheet with a surface sheet that has an adhesive layer having a desired adhesive property and can be suitably used for applications such as delivery slips.

As a result of examining the cause of powder falling by the present inventors, it was found that powder dropping occurs because the adhesive layer peels and charges when the sticker is fed out from the original fabric. And based on the knowledge, it further examined and invented the following adhesive sheets and adhesive sheets with surface sheets.
[1] An adhesive sheet having an adhesive substrate and a release substrate,
The adhesive substrate is provided on one surface of the adhesive substrate support, the adhesive substrate support, the pressure-sensitive adhesive layer containing the adhesive force control agent, and the other of the adhesive substrate support. An adhesive layer provided on the surface and adjacent to the release substrate;
An adhesive sheet, wherein the release substrate is impregnated or coated with a treatment liquid containing an antistatic agent on the surface opposite to the adhesive substrate side.
[2] The adhesive sheet according to [1], wherein the antistatic agent is sodium hydrogen carbonate or sodium chloride.
[3] The adhesive sheet according to [1] or [2], wherein the treatment liquid further contains a lubricant.
[4] The adhesive sheet according to [3], wherein the lubricant is a polyolefin wax.
[5] The adhesive sheet according to [4], wherein the polyolefin wax is polyethylene wax.
[6] The adhesive sheet according to any one of [1] to [5], wherein the treatment liquid further contains a water retention agent.
[7] The adhesive sheet according to any one of [1] to [6], and a surface sheet that is detachably bonded to a part or all of the pressure-sensitive adhesive layer of the adhesive sheet. Adhesive sheet with surface sheet.

In the adhesive sheet of the present invention, powdering of the adhesive layer is prevented. Therefore, desired adhesiveness can be easily exerted, and contamination of the traveling roll can be prevented.
As for the adhesive sheet with a surface sheet of this invention, an adhesive bond layer has desired adhesiveness.

"Adhesive sheet"
An embodiment of the adhesive sheet of the present invention will be described.
In FIG. 1, the adhesive sheet of this embodiment is shown. This adhesive sheet 1a has an adhesive substrate 10 and a release substrate 20.

<Adhesive substrate>
The adhesive substrate 10 includes an adhesive substrate support 11, a pressure-sensitive adhesive layer 12 provided on one surface of the adhesive substrate support 11, and the other surface of the adhesive substrate support 11. And an adhesive layer 13 provided. Moreover, in the adhesive base material 10 in this embodiment, the binder resin layer 14 is provided between the support 11 for adhesive base materials and the pressure sensitive adhesive layer 12. FIG. The pressure-sensitive adhesive layer 13 is adjacent to the peeling substrate 20.

(Support for adhesive substrate)
As the support 11 for an adhesive substrate, paper or films are used.
Examples of the paper include cast coated paper, art paper, coated paper, high quality paper, craft paper, and glassine paper. Examples of the plastic film include various polymer films such as polypropylene, polyethylene, polyester such as polyethylene terephthalate and polybutylene terephthalate, and polyvinyl chloride. Also, vapor-deposited paper, synthetic paper, cloth, non-woven fabric, metal foil and the like can be used. Furthermore, these laminated bodies etc. can also be employ | adopted suitably.
Among these, paper is preferable from the viewpoints of handleability and price.
Printing may be performed on one side or both sides of the support 11 for the adhesive substrate.

  The thickness of the adhesive substrate support 11 is preferably 10 to 200 μm. If the thickness of the support 11 for adhesion base material is 10 micrometers or more, sufficient intensity | strength can be ensured, and if it is 200 micrometers or less, flexibility can be improved.

(Pressure sensitive adhesive layer)
The pressure-sensitive adhesive layer 12 is a layer having a pressure-sensitive adhesive property by containing an adhesive force control agent and a pressure-sensitive adhesive main component as essential components and a pigment as an optional component.
Examples of the pressure-sensitive adhesive main agent contained in the pressure-sensitive adhesive layer 12 include adhesive resins such as rubber elastomers, acrylic resins, polyurethanes, polyesters, and silicone resins.
The surface of the pressure sensitive adhesive layer 12 can be printed. In the present embodiment, as shown in FIG. 2, the inquiry address or notice of the delivery company is printed on the half surface 12a of the pressure-sensitive adhesive layer 12, and the delivery destination information and shipper information are printed on the other side 12b. A frame line 12c for forming a column for printing the product name is printed. By printing in this way, the adhesive sheet 1a can be used as a sticker for a delivery slip.

[Adhesive strength control agent]
The adhesive force control agent controls the adhesive force by forming irregularities on the surface of the pressure-sensitive adhesive layer 12.
As an adhesive force control agent, Preferably the average particle diameter is 4-30 micrometers, More preferably, 5-20 micrometers fine particle is mentioned. The average particle diameter in the present invention is a 50% volume average particle diameter measured by a laser diffraction particle size distribution analyzer. If the average particle diameter of the adhesive force control agent is 4 μm or more, the adhesive force can be reliably controlled, and if it is 30 μm or less, the adhesive force of the pressure-sensitive adhesive layer 12 can be sufficiently secured.

Further, the adhesive force controlling agent may be an inorganic compound or an organic compound. Specific adhesive force control agents include, for example, zinc oxide, titanium oxide, zeolite, calcium carbonate, clay, aluminum oxide, wheat starch (not gelatinized), pulp powder (cellulose derivative, etc.), silica, alumina, Examples thereof include γ-alumina, colloidal silica, plastic pigment, polyethylene, polypropylene, and fluorine resin. Among these, wheat starch is preferable because the adhesive force can be easily controlled.
Moreover, an adhesive force control agent may be used individually by 1 type, and may use 2 or more types together.

  The content of the adhesive force control agent in the pressure-sensitive adhesive layer 12 is preferably 20 to 300% by mass. If the content of the adhesive strength control agent is 20% by mass or more, the pressure-sensitive adhesiveness is higher, and if it is 300% by mass or less, a decrease in the adhesive strength can be prevented.

[Pigment]
The pressure-sensitive adhesive layer 12 preferably contains a pigment in addition to the adhesive force control agent. If the pressure sensitive adhesive layer 12 contains a pigment, the ink absorbability can be increased and the printability can be improved. In addition, the adhesive force can be controlled auxiliary.
The pigment is fine particles having an average particle diameter of 0.01 to 4 μm. When the average particle size is 0.1 μm or more, practical particles are obtained, and when the average particle size is 4 μm or less, ink absorbability can be sufficiently ensured.

  Specific examples of the pigment include silica, calcium carbonate, and the like. Silica is preferable because it has a large specific surface area and oil absorption and higher ink absorbability.

  The average particle diameter of silica is preferably 0.1 to 3.0 μm. When the average particle diameter of the silica is 3.0 μm or less, the surface strength of the pressure-sensitive adhesive layer 12 becomes higher and the printability is excellent. If the average particle diameter of silica is 0.1 μm or more, it can be prevented from falling off from the pressure-sensitive adhesive layer.

Preferably the specific surface area of silica is 40~600m ² / g, more preferably 40~500m ² / g. When the specific surface area of silica is 40 m ² / g or more, the contact area with the ink is increased, the absorption rate into the silica can be increased, and the ink absorbability can be further increased. On the other hand, when the specific surface area of silica exceeds 600 m ² / g, absorption of a solvent in a pressure-sensitive adhesive coating solution containing silica and a pressure-sensitive adhesive can be suppressed, and an increase in viscosity can be prevented.

  The oil absorption of silica is preferably 100 to 250 ml / 100 g. If the oil absorption amount of silica is 100 ml / 100 g or more, the ink can be sufficiently absorbed by silica, and the drying speed becomes faster. Therefore, since the ink quickly penetrates into the pressure-sensitive adhesive layer 12, water resistance can be ensured. Moreover, if the oil absorption amount of a silica is 250 ml / 100g or less, the absorption of the solvent in the pressure sensitive adhesive coating liquid containing a silica and a pressure sensitive adhesive can be suppressed, and an increase in viscosity can be prevented.

  The pigment content in the pressure-sensitive adhesive layer 12 is preferably 25 to 85% by mass in terms of solid content. When the pigment content is 25% by mass or more, the ink absorptivity becomes higher. On the other hand, if the content of the pigment is 85% by mass or less, it is possible to prevent the adhesive force from being lowered and to sufficiently secure the adhesion strength of the pressure-sensitive adhesive layer 12 to the adhesive substrate support 11.

Further, other auxiliary agents may be added to the pressure-sensitive adhesive layer 12 as necessary.
Examples of other auxiliaries include thickeners, pH adjusters, crosslinking agents, antifoaming agents, antiseptic / antifungal agents, stabilizers, wetting agents, wetting agents and the like. Among them, the wetting agent is considered to affect the adhesive force of the pressure-sensitive adhesive layer, and an effect excellent in powder removal can be obtained by the combined use with the antistatic agent.
As the wetting agent, for example, one or more can be appropriately selected from known ones such as an anionic surfactant, a cationic surfactant, and a nonionic surfactant. Among the wetting agents, those having high hydrophilicity are preferable.

Examples of the anionic surfactant include fatty acid type, sulfonic acid type, phosphoric acid type, succinic acid type, sulfosuccinic acid type, carboxylic acid type, and polycarboxylic acid type.
Examples of the cationic surfactant include alkylamine salt type, benzylamine salt type, and polyamine.
Nonionic surfactants include ethers, alkylphenols, esters, alkylolamides, glycerols, glycerol esters, sorbitan ethers, sorbitan esters, sorbitan ester ethers, ethylene oxides, propylene oxides. Etc. Among them, a highly hydrophilic material having a HLB (hydrophilic / lipophilic balance) value in the range of 8 to 18 is preferable.

  The content of the surfactant in the pressure-sensitive adhesive layer 12 is preferably 2 to 15% by mass, and more preferably 6 to 12% by mass from the viewpoint of proper coating. If the surfactant content is less than 2% by mass, there will be no effect in suppressing the deterioration of the adhesive performance during long-term storage, and if it exceeds 15% by mass, the coating liquid will be significantly foamed, making it inappropriate for coating. In some cases, so-called “coating liquid shock” may occur, or the entire coating liquid may aggregate, making the coating impossible.

(Adhesive layer)
The pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 13 is not particularly limited, and for example, natural rubber-based pressure-sensitive adhesives, synthetic rubber-based pressure-sensitive adhesives, acrylic pressure-sensitive adhesives, urethane-based pressure-sensitive adhesives, silicone-based pressure-sensitive adhesives and the like are used. Moreover, any of solvent system, emulsion system, and water system may be sufficient.
Other auxiliary agents may be added to the adhesive as necessary. Other auxiliaries include thickeners, pH adjusters, tackifiers, crosslinkers, adhesive fine particles, antifoaming agents, antiseptic / antifungal agents, pigments, inorganic fillers, stabilizers, wetting agents, wetting agents, etc. Can be mentioned.

(Binder resin layer)
The binder resin layer 14 is for improving the adhesion between the adhesive substrate support 11 and the pressure-sensitive adhesive layer 12 and for increasing the surface strength when printing on the surface of the pressure-sensitive adhesive layer 12. It is the layer provided in.
Examples of the binder resin included in the binder resin layer 14 include a styrene-butadiene copolymer, a styrene-butadiene-acrylic acid ester copolymer, an acrylic acid ester copolymer, an ethylene-vinyl acetate copolymer, and oxidized starch. And starches (gelatinized). Among these, since the surface strength of the pressure-sensitive adhesive layer 12 becomes higher, a styrene-butadiene copolymer, an acrylate ester copolymer, and an ethylene-vinyl acetate copolymer are preferable.

<Peeling substrate>
The peeling substrate 20 has a treatment liquid on a surface 20a opposite to the adhesive substrate 10 side (hereinafter, the surface 20a opposite to the bonding substrate 10 side of the peeling substrate 20 may be referred to as a back surface 20a). Is impregnated or coated. In the present specification, impregnation or coating of the treatment liquid on the back surface 20a of the release substrate 20 is referred to as back surface treatment.
Moreover, the peeling base material 20 in this embodiment was provided on the adhesive base material 10 side of the peeling base material support 21 with the treatment liquid impregnated or coated on the back surface 20a and the peeling base material support 21. And a release agent layer 22.

(Processing liquid)
The treatment liquid is a liquid containing an antistatic agent as an essential component. The treatment liquid preferably further contains a lubricant and / or a water retention agent in addition to the antistatic agent. If the back surface treatment is performed using a treatment liquid further containing a lubricant and / or a water retention agent, powder falling can be further prevented.

[Antistatic agent]
The antistatic agent may be an inorganic compound or an organic compound. For example, inorganic compounds such as sodium sulfate, sodium carbonate, lithium carbonate, sodium metasilicate, sodium tripolyphosphate, sodium metaphosphate, anionic surfactants such as sulfonate, sulfate, carboxylate, phosphate, Examples include cationic surfactants, nonionic surfactants such as polyethylene glycol, glycerin, and sorbit, amphoteric surfactants, polymer electrolytes, and conductive resins.
As the antistatic agent for the inorganic compound, sodium hydrogen carbonate or sodium chloride is preferable, and sodium hydrogen carbonate is preferable from the viewpoint of durability of the antistatic effect.
Among the organic compound antistatic agents, examples of the cationic surfactant include quaternary ammonium chloride, quaternary ammonium nitrate, and quaternary ammonium sulfate. Examples of amphoteric surfactants include alkyl betaine type, alkyl imidazoline type, and alkyl alanine type compounds. Examples of the conductive resin include polyvinyl benzyl type cations and polyacrylic acid type cations.

  The content of the antistatic agent in the total solid content contained in the treatment liquid is preferably 0.01 to 20% by mass. If the content of the antistatic agent in the total solid content is 0.01% by mass or more, powder falling can be reliably prevented.

[Lubricant]
A lubricant improves slipperiness. If the slipperiness of the back surface 20a of the peeling substrate 20 is increased, powder falling off when the adhesive sheet 1a is fed out from the original fabric can be further prevented.
Examples of the lubricant include hydrocarbons (liquid paraffin, natural paraffin, synthetic paraffin, micro wax, polyolefin wax (polyethylene wax, etc.), chlorinated hydrocarbon, fluorocarbon, etc.), fatty acid (higher fatty acid, oxy fatty acid (stearin). Acid, hydroxystearic acid, etc.)), fatty acid amide (fatty acid amide, alkylene bis fatty acid amide (stearic amide, ethylene bisstearamide, etc.)), fatty acid ester (fatty acid lower alcohol ester, fatty acid polyhydric alcohol ester, fatty acid) Polyglycol esters (butyl stearate, ester wax, etc.), alcohols (fatty acid alcohol, polyhydric alcohol, polyglycol, polyglycerol (stearyl alcohol, cetyl alcohol, etc.)), metal鹸系 (Ca fatty acid non-alkali metal salt (stearic acid, Mg, Ba salt, etc.)) can be mentioned those. One lubricant may be used alone, or two or more lubricants may be used in combination.

Among the above-mentioned lubricants, hydrocarbon-based ones are preferable because slipperiness becomes higher, and polyolefin-based waxes or modified products thereof are particularly preferable.
As the polyolefin wax, any of a polyolefin wax obtained by polymerizing ethylene, propylene or a mixture of ethylene and propylene under a high temperature and a high pressure with a radical polymerization catalyst, or a polyolefin wax polymerized under a low pressure with a Ziegler catalyst can be used.

Examples of modified polyolefin waxes include compounds obtained by partial oxidation or oxidative decomposition of polyolefin waxes using air, oxygen, ozone, or other various oxidizing agents. Moreover, the copolymer of ethylene, propylene, or its mixture, and ethylenically unsaturated carboxylic acid is mentioned. Examples of the ethylenically unsaturated carboxylic acid include ethylenic monocarboxylic acid or dicarboxylic acid such as (meth) acrylic acid, maleic acid, fumaric acid, and itaconic acid.
Further, the modified polyolefin wax includes a hydrolyzed copolymer of ethylene, propylene or a mixture thereof and an unsaturated monomer having a functional group that can be derived into a carboxy group by hydrolysis. . Examples of the unsaturated monomer having a functional group that can be derived into a carboxyl group by hydrolysis include acid anhydrides (maleic anhydride, itaconic anhydride, etc.), alkyl esters of ethylenically unsaturated carboxylic acids ((meth)) Methyl acrylate, ethyl (meth) acrylate), nitrile group-containing unsaturated monomers ((meth) acrylonitrile), and the like.

  The modified polyolefin wax may be in the form of a salt or a partial salt. Counter ions for forming a salt include amine compounds such as ammonia, alkylamines (monoethylamine, monobutylamine, triethylamine, etc.), alkanolamines (monoethanolamine, diethanolamine, triethanolamine, etc.), and periodic table 1 And ions of group metals (lithium, sodium, potassium, etc.) and group 2 metals (magnesium, calcium, zinc, etc.) of the periodic table. Among these ions, ammonia, diethanolamine, triethanolamine, sodium, potassium, magnesium, calcium, and zinc ions are preferable.

  Among these lubricants, polyolefin wax, a partial oxide or oxidative decomposition product of polyolefin wax, and a copolymer of ethylene, propylene or a mixture thereof and ethylenic carboxylic acid are preferable because slip properties are particularly high. Furthermore, polyolefin wax, a partial oxide or oxidative decomposition product of polyolefin wax, a copolymer of ethylene, propylene or a mixture thereof and (meth) acrylic acid, maleic acid, maleic anhydride is more preferable. Particularly preferred are polyethylene wax, polypropylene wax and partial oxides or oxidative decomposition products thereof, and copolymers of ethylene, propylene and (meth) acrylic acid or maleic anhydride.

The lubricant is particulate, and the average particle size is preferably 5 to 100 μm, more preferably 10 to 50 μm, and particularly preferably 15 to 30 μm.
If the average particle diameter of the lubricant is 5 μm or more, sufficient slipperiness can be obtained, and if it is 100 μm or less, the smoothness of the back surface 20a can be prevented from being lowered, and the occurrence of streaks can be suppressed.

  The content of the lubricant in the total solid content contained in the treatment liquid is preferably 0.01 to 10% by mass. If the content of the lubricant is 0.01% by mass or more, powder falling can be further prevented. However, if it exceeds 10% by mass, the effect of the antistatic agent becomes small, so that the effect of preventing powder falling tends to be low.

[Water retention agent]
A water retention agent is for improving water retention. If the back surface treatment is performed with a treatment liquid containing a water retention agent, the antistatic effect of the adhesive sheet 1a is enhanced, so that powder falling can be further prevented.
As the water retention agent, for example, a water-soluble plasticizer is used. Examples of the water-soluble plasticizer include polyhydric alcohols such as ethylene glycol, glycerin, trimethylolpropane, diethylene glycol, triethylene glycol, dipropylene glycol, pentaerythritol, sorbit, sorbitan, and sucrose, and polyethylene glycols having various polymerization degrees. And polyalkylene glycols such as polypropylene glycol.
Among these, glycerin, trimethylolpropane, diethylene glycol, triethylene glycol, and dipropylene glycol are preferable because powdering can be further prevented.
A water retention agent may be used individually by 1 type, and may be used together 2 or more types.

  The content of the water retention agent in the total solid content contained in the treatment liquid is preferably 0.1 to 50% by mass. If content of a water retention agent is 0.1 mass% or more, powder fall-off can be prevented more. However, if it exceeds 50% by mass, the effect of the antistatic agent is reduced, and therefore the effect of preventing powder falling tends to be reduced.

  As the support 21 for peeling base materials, the thing similar to the support 11 for adhesion base materials is mentioned. The thickness of the release substrate support 21 is also preferably 30 to 150 μm, like the adhesive substrate support 11.

As the release agent constituting the release agent layer 22, for example, a general-purpose addition-type or condensation-type silicone-type release agent or a long-chain alkyl group-containing compound is used. In particular, an addition type silicone release agent having high reactivity is preferably used.
Specific examples of silicone release agents include BY24-4527 and SD-7220 manufactured by Toray Dow Corning Silicone, KS-3600, KS-774, and X62-2600 manufactured by Shin-Etsu Chemical Co., Ltd. Is mentioned. Further, the silicone-based release agent may contain a silicone resin that is an organosilicon compound having a SiO ₂ unit and (CH ₃ ) ₃ SiO _1/2 unit or CH ₂ ═CH (CH ₃ ) SiO _1/2 unit. preferable. Specific examples of the silicone resin include BY24-843, SD-7292, SHR-1404, etc. manufactured by Toray Dow Corning Silicone, KS-3800, X92-183, manufactured by Shin-Etsu Chemical Co., Ltd., and the like.

<Manufacturing method>
An embodiment of the method for producing the adhesive sheet 1a will be described.
An antistatic agent and water or an organic solvent are included as essential components on the back surface 20a of the release substrate 20 provided with a release agent layer 22 on one side of the release substrate support 21, and a lubricant, a water retention agent and the like are optional components. Impregnation or coating with a treatment solution containing as a backside treatment.
The treatment on the back surface 20a of the release substrate 20 may be performed either before or after being processed into the adhesive paper. Further, the release agent layer 22 treatment step, the adhesive layer 13 application step, and the bonding step. It can also be processed in any step.
Examples of the treatment liquid coating or impregnation method include known methods such as a blade coater, an air knife coater, a roll coater, a gravure coater, a bar coater, and a size press coater.

  The solid concentration of the treatment liquid is preferably 1 to 50% by mass, and more preferably 10 to 30% by mass. If the solid content concentration of the treatment liquid is 1 mass or more, powder falling can be sufficiently prevented even with a small number of backside treatments, and if it is 50 mass% or less, the treatment liquid can be easily prepared.

The dry coating amount or dry impregnation amount of the treatment liquid is preferably 0.1 to 5 g / m ² . If the dry coating amount or dry impregnation amount of the treatment liquid is 0.1 g / m ² or more, powder falling can be further prevented. However, even if it exceeds 5 g / m < ² >, the increase in the powder fall-off preventing effect corresponding to the increase is not observed, and only the cost is increased.
In particular, the dry coating amount or dry impregnation amount of the antistatic agent is preferably 0.001 to 1 g / m ² . If the dry coating amount or dry impregnation amount of the antistatic agent is 0.001 g / m ² or more, powder falling can be further prevented. However, even if it exceeds 1 g / m < ² >, the increase in the powder fall-off prevention effect corresponding to the increment is not observed, and only the cost is increased.

A pressure-sensitive adhesive coating solution containing a pressure-sensitive adhesive and water or an organic solvent is applied to the surface of the release agent layer 22 of the release substrate 20 and dried to provide the pressure-sensitive adhesive layer 13.
The dry coating amount of the pressure-sensitive adhesive coating solution is preferably 10 to 40 g / m ² . If the dry coating amount of the pressure-sensitive adhesive coating solution is 10 g / m ² or more, sufficient adhesiveness can be secured. However, even if it exceeds 40 g / m ² , no increase in the tackiness according to the increase is observed, which only increases the cost.

The method for applying the adhesive coating solution can be appropriately selected from knife coaters, micro bar coaters, air knife coaters, reverse roll coaters, reverse gravure coaters, vario gravure coaters, die coaters, curtain coaters and the like.
As a drying method, for example, hot air drying, infrared drying, vacuum drying, or the like can be applied.

Also, a binder resin coating solution containing a binder resin and water or an organic solvent is applied to one side of the support 11 for the adhesive base material and dried to provide the binder resin layer 14.
The dry coating amount of the binder resin coating liquid is preferably 1 to ²⁰ g / m ² . If the dry coating amount of the binder resin coating liquid is 1 g / m ² or more, the adhesion between the adhesive substrate support 11 and the pressure-sensitive adhesive layer 12 can be increased, and the pressure-sensitive adhesive layer 12 Printability can be increased. However, even if it exceeds 20 g / m < ² >, the adhesiveness and printability according to the increase are not increased, and only the cost is increased.

  Next, a pressure-sensitive adhesive coating liquid containing an adhesive force control agent, a pressure-sensitive adhesive main agent, water or an organic solvent, and a pigment as an optional component on the surface of the support 11 for the adhesive base material of the binder resin layer 14. Is applied and dried to provide the pressure-sensitive adhesive layer 12. The coating method and drying method of the pressure-sensitive adhesive coating solution are the same as the coating method and drying method of the pressure-sensitive adhesive coating solution.

The dry coating amount of the pressure sensitive adhesive coating solution is preferably ² to ²⁰ g / m ² . When the dry coating amount of the pressure-sensitive adhesive coating solution is 2 g / m ² or more, the adhesion between the adhesive substrate support 11 and the pressure-sensitive adhesive layer 12 can be increased, and the pressure-sensitive adhesive layer 12 printability can be made higher. However, even if it exceeds 20 g / m < ² >, the adhesiveness and printability according to the increase are not increased, and only the cost is increased.

  Next, the adhesive layer 1 provided on one side of the release substrate 20 is bonded to the surface of the adhesive substrate support 11 on which the pressure-sensitive adhesive layer 12 is not provided to obtain the adhesive sheet 1a.

<How to use>
The adhesive sheet 1a can be used, for example, as a sticker for a delivery slip. When the adhesive sheet 1a is used as a sticker, a delivery slip can be obtained by adhering the surface sheet to be a delivery slip to the pressure sensitive adhesive layer 12 in a peelable manner.
The process of adhering the surface sheet to the adhesive sheet 1a may be performed at a place different from the manufacturing process of the adhesive sheet 1a. Therefore, the adhesive sheet 1a is wound while laminating the surface of the pressure-sensitive adhesive layer 12 on the back surface of the release substrate 20, and may be stored and transported in the form of a roll-shaped raw fabric. When the adhesive sheet 1a is in the form of an original fabric, the adhesive sheet 1a is fed out from the original fabric in the step of adhering the topsheet.

As a result of investigations by the present inventors, in the adhesive sheet 1a in which the release substrate 20 was subjected to the back surface treatment, a part of the pressure-sensitive adhesive layer 12 adhered to the release substrate 20 when it was drawn out from the original fabric. It was found that the pressure sensitive adhesive layer 12 can be prevented from peeling off. This seems to be because the pressure-sensitive adhesive layer 12 is less likely to be peeled and charged in the adhesive sheet 1a in which the back surface treatment is performed on the peeling substrate 20.
Further, it has been found that the adhesive sheet 1a can prevent the pressure-sensitive adhesive layer 12 from adhering to the traveling roll even if the pressure-sensitive adhesive layer 12 contacts the traveling roll. This seems to be because the pressure-sensitive adhesive layer 12 is less likely to be peeled and charged, and electrostatic adhesion between the pressure-sensitive adhesive layer 12 and the running roll can be suppressed.
As described above, the adhesive sheet 1a can prevent the pressure-sensitive adhesive layer 12 from falling off.

In addition, the adhesive sheet of this invention is not limited to embodiment mentioned above. For example, the adhesive sheet may not include the binder resin layer. The pressure-sensitive adhesive layer cannot be smoothed by applying pressure, but if a binder resin layer is provided, the pressure-sensitive adhesive layer can be smoothed without applying pressure. Therefore, it is preferable to provide a binder resin layer.
Moreover, the binder resin layer may be provided between the support body for adhesion base materials, and the adhesive layer.
Further, when the support for release substrate is a material having high releasability, the release agent layer is unnecessary.

"Adhesive sheet with surface sheet"
One Embodiment of the adhesive sheet with a surface sheet of this invention is described.
In FIG. 3, the adhesive sheet with a surface sheet of this embodiment is shown. The adhesive sheet 1 with a surface sheet of the present embodiment includes the above-described adhesive sheet 1a and a surface sheet 1b that is detachably bonded to the half surface 12a of the pressure-sensitive adhesive layer 12 of the adhesive sheet 1a. That is, in the adhesive sheet 1 with the topsheet, the surface 12b (see FIG. 2) of the pressure-sensitive adhesive layer 12 on which the frame line 12c is printed is exposed.

<Surface sheet>
The surface sheet 1b includes a surface substrate 30 and an adhesion suppression layer 40 provided on the surface sheet 30 on the adhesive sheet 1a side.
(Surface substrate)
As the surface base material 30, the thing similar to the support body 11 for adhesion base materials can be used. The thickness of the surface base material 30 is also preferably 10 to 200 μm, like the support 11 for the adhesive base material.
On the surface opposite to the adhesion suppressing layer 40 side of the surface substrate 30 (hereinafter, the surface opposite to the adhesion suppressing layer 40 side of the surface substrate 30 may be referred to as the surface 30a), printing is appropriately performed. Can be applied. When the front sheet 1b is used as a delivery slip of a delivery slip, a frame for forming a field for printing, for example, a delivery destination address, delivery destination information such as name, sender information, product name, etc. on the front surface 30a. Lines etc. are printed.

(Adhesion suppression layer)
The adhesion suppression layer 40 is a layer that is in contact with the pressure-sensitive adhesive layer 12 and suppresses the adhesive force of the pressure-sensitive adhesive layer 12 so as to be peelable. The adhesion suppression layer 40 includes, for example, a film forming component, an ink component, a pigment, a release agent, and the like.
Examples of film forming components include casein, polyvinyl alcohol, ethylene-maleic anhydride copolymer, styrene-maleic anhydride copolymer, ethyl cellulose, ethyl hydroxyethyl cellulose, acetyl cellulose, cellulose acetate propionate, cellulose acetate butyrate. Examples thereof include rate, nitrocellulose, polyvinyl butyral, polyvinyl chloride, and polystyrene.
Examples of the ink component include ionizing radiation curable substances such as trimethylolpropane triacrylate, pentaerythritol triacrylate, and hexanediol diacrylate. When an ionizing radiation curable substance is included, it is preferable to contain a photopolymerization initiator.

As a method for forming the adhesion suppressing layer 40, for example, an ink for forming an adhesion suppressing layer containing a film forming component, an ink component, a pigment, a release agent, etc. is prepared, and the ink is used, for example, letterpress printing or offset printing. A method of printing on one side of the surface substrate 30 by a printing method such as flexographic printing so that the formation amount of the adhesion suppression layer 40 is 0.1 to 5 g / m ² can be mentioned.

<Manufacturing method>
As a method for producing the adhesive sheet 1 with the topsheet, for example, the adhesive sheet 1a is fed out from the original fabric, and the adhesion suppressing layer 40 of the topsheet 1b is stacked on the half surface 12a of the pressure-sensitive adhesive layer 12 of the adhesive sheet 1a. For example, a method of pasting together. Since the pressure-sensitive adhesive layer 12 contains an adhesive force control agent and has pressure-sensitive adhesiveness, in order to bond the surface sheet 1b, the adhesive sheet 1a and the surface sheet 1b are stacked and then pressure-bonded. It is preferable.

<How to use>
The adhesive sheet 1 with a front sheet is used as a delivery slip, for example, by printing a frame line for forming a column for printing delivery destination information, sender information, and product name on the front surface 30a of the front sheet 1b.
Examples of the usage method as a delivery slip include the following methods. First, the adhesive sheet 1 with a front sheet is supplied to a non-impact printer or the like, and delivery destination information, shipper information, product name, etc. are printed on the surface 12b of the pressure-sensitive adhesive layer 12 of the adhesive sheet 1a and the surface 30a of the front sheet 1b. To do. Next, the peeling base material 20 is peeled off to expose the pressure-sensitive adhesive layer 13, and the adhesive base material 10 with the surface sheet 1 b is attached to the luggage or the like by the exposed pressure-sensitive adhesive layer 13. Then, the delivery person delivers the package etc. to the delivery destination based on the delivery destination information printed on the surface of the adhesive sheet 1a and the surface of the top sheet 1b, and the delivery destination receives the receipt confirmation mark or signature on the top sheet 1b. After that, the top sheet 1b is peeled off from the adhesive substrate 10 and collected.

  In the adhesive sheet 1 with a surface sheet described above, the adhesive sheet 1a in which the powder is prevented from being dropped is used, and the pressure-sensitive adhesive layer 12 is prevented from being powdered, so that desired adhesiveness can be exhibited. it can.

In addition, the adhesive sheet with a surface sheet of the present invention is not limited to the above-described embodiment. For example, the surface sheet may not include an adhesion suppression layer. However, it is preferable to provide an adhesion suppression layer in that the adhesiveness of the pressure-sensitive adhesive layer can be further controlled.
Moreover, the surface sheet may be adhered to the entire surface of the pressure-sensitive adhesive layer.

Example 1
Prepare a release substrate provided with a release agent layer on one side of the release substrate support, and place sodium bicarbonate (Tosoh) on the side of the release substrate support on which the release agent layer is not provided. A treatment liquid consisting of an aqueous solution containing 0.9 mass% of the product was applied by a roll coater, and the back surface treatment was performed.
Also, an emulsion-type acrylic pressure-sensitive adhesive coating solution (“Nicazole L-501” manufactured by Nippon Carbide Co., Ltd.) was applied on the release agent layer and dried with hot air at 130 ° C. to form a pressure-sensitive adhesive layer. . Thereby, the laminated body which consists of a peeling base material and an adhesive layer was obtained.
Also, 20 parts by weight of wheat starch (AS-225 manufactured by Chiba Starch), 100 parts by weight of the pressure-sensitive adhesive main agent, and 10% by weight of a wetting agent (Emulgen 707, manufactured by Kao Corporation) are mixed with the pressure-sensitive adhesive. Thus, a pressure-sensitive adhesive coating solution was prepared. Next, the pressure-sensitive adhesive coating solution was applied to one side of paper, which is a support for an adhesive substrate, by a bar coater and dried with hot air at 120 ° C. to form a pressure-sensitive adhesive layer. This obtained the laminated body of the support body for adhesion base materials, and a pressure sensitive adhesive layer.
Next, the laminate composed of the release substrate and the pressure-sensitive adhesive layer obtained as described above, and the laminate of the support for adhesive substrate and the pressure-sensitive adhesive layer are combined with the pressure-sensitive adhesive layer and the adhesive substrate. The adhesive sheet was obtained by bonding so that the support for contact was in contact.

(Example 2)
Pressure sensitive adhesive coating liquid, 20 parts by mass (in terms of solid content) of pulp powder (crystalline cellulose, Abecel PH-M06 manufactured by Asahi Kasei), 80 parts by mass of synthetic silica (manufactured by Tokuyama), Adhesive sheet in the same manner as in Example 1, except that 100 parts by mass of the pressure-sensitive adhesive main agent and 10% by mass of a wetting agent (Emulgen 707, manufactured by Kao Corporation) were mixed with the pressure-sensitive adhesive. Got.

(Example 3)
An adhesive sheet was obtained in the same manner as in Example 1 except that a treatment liquid containing 0.9% by mass of sodium chloride was used.

Example 4
An adhesive sheet was obtained in the same manner as in Example 1 except that a treatment liquid containing 20% by mass of glycerin (manufactured by NOF Corporation) in addition to sodium hydrogen carbonate was used.

(Example 5)
Pressure sensitive adhesive coating liquid, 20 parts by mass (in terms of solid content) of pulp powder (crystalline cellulose, Abecel PH-M06 manufactured by Asahi Kasei), 80 parts by mass of synthetic silica (manufactured by Tokuyama), Adhesive sheet in the same manner as in Example 4 except that 100 parts by mass of the pressure-sensitive adhesive main agent and 10% by mass of a wetting agent (Emulgen 707, manufactured by Kao Corporation) were mixed with the pressure-sensitive adhesive. Got.

(Example 6)
The same treatment as in Example 1 was carried out except that a treatment liquid containing 0.9% by mass of a double-sided surfactant (Kao Electro Stripper) and 0.1% by mass of paraffin wax (Nippon Seiki EMUSTAR) was used. Thus, an adhesive sheet was obtained.

(Example 7)
Pressure sensitive adhesive coating liquid, 20 parts by mass (in terms of solid content) of pulp powder (crystalline cellulose, Abecel PH-M06 manufactured by Asahi Kasei), 80 parts by mass of synthetic silica (manufactured by Tokuyama), Adhesive sheet in the same manner as in Example 6 except that 100 parts by mass of the pressure-sensitive adhesive main agent and 10% by mass of a wetting agent (Emulgen 707, manufactured by Kao Corporation) were mixed with the pressure-sensitive adhesive. Got.

(Example 8)
In the same manner as in Example 1 except that, in addition to sodium hydrogen carbonate, a treatment liquid containing 0.1% by mass of polyethylene wax (manufactured by Mitsui Chemicals) and 20% by mass of glycerin (manufactured by NOF Corporation) was used. Thus, an adhesive sheet was obtained.

Example 9
Pressure sensitive adhesive coating liquid, 20 parts by mass (in terms of solid content) of pulp powder (crystalline cellulose, Abecel PH-M06 manufactured by Asahi Kasei), 80 parts by mass of synthetic silica (manufactured by Tokuyama), Adhesive sheet in the same manner as in Example 8, except that 100 parts by mass of the pressure-sensitive adhesive main agent and 10% by mass of a wetting agent (Emulgen 707, manufactured by Kao Corporation) were mixed with the pressure-sensitive adhesive. Got.

(Example 10)
The pressure-sensitive adhesive coating solution was mixed with 50 parts by mass of synthetic silica (manufactured by Tokuyama), 50 parts by mass of wheat starch (AS-225 made of Chiba starch), 100 parts by mass of the pressure-sensitive adhesive main agent, and pressure-sensitive adhesive. On the other hand, an adhesive sheet was obtained in the same manner as in Example 8 except that it was prepared by mixing 10% by mass of a wetting agent (manufactured by Kao Corporation, Emulgen 707).

(Example 11)
The pressure-sensitive adhesive coating solution was prepared by adding 20 parts by weight of wheat starch (AS-225 manufactured by Chiba Starch), 100 parts by weight of a pressure-sensitive adhesive main agent, and a wetting agent (Emulgen 707, manufactured by Kao Corporation). ) An adhesive sheet was obtained in the same manner as in Example 1 except that it was prepared by mixing 1% by mass.

(Comparative Example 1)
An adhesive sheet was obtained in the same manner as in Example 1 except that the back surface treatment was not performed on the release substrate support.

(Comparative Example 2)
The same treatment as in Example 1 was performed except that the treatment liquid did not contain an antistatic agent and contained 0.1% by mass of polyethylene wax (Nopcomal made by San Nopco) and 20% by mass of glycerin (made by Nippon Oil & Fats). Thus, an adhesive sheet was obtained.

The powder fall and adhesiveness of the adhesive sheets of Examples 1 to 11 and Comparative Examples 1 and 2 were evaluated as follows. The evaluation results are shown in Table 1.
(Powder falling)
The powder fall was evaluated by visually observing the adhesion of the powder to the traveling roll contacting the adhesive sheet, based on the following criteria.
○: No powder adhered to the traveling roll.
(Triangle | delta): Although powder | flour adhered a little on the driving | running | working roll, it was in the practical range.
X: The powder adhered to the traveling roll violently.

(Adhesiveness)
Using a dry sealer, the pressure-sensitive adhesive layer 12 and the high-quality paper were overlapped, passed through a press roll having a roll gap of 150 μm and pressed, and then peeled again by T-type peeling. The peeled state at this time was observed, and the adhesiveness was evaluated according to the following criteria.
○: Adhesive strength that can be re-peeled cleanly.
(Triangle | delta): Although adhesive strength was weak or base-material destruction occurred in one part, it was in the practical range.
X: Adhesive strength was weak or peeled or the substrate was broken.

The adhesive sheets of Examples 1 to 11 obtained by performing the back surface treatment with a treatment agent containing sodium hydrogen carbonate or sodium chloride as an antistatic agent are prevented from falling off and have sufficient adhesion. It was. In particular, the adhesive sheet of Examples 4 and 5 obtained by performing the back surface treatment with a treatment agent containing sodium hydrogen carbonate and glycerin as a water retention agent, a double-sided surfactant as an antistatic agent, and a paraffin wax as a lubricant. The adhesive sheets of Examples 6 and 7 obtained by performing the back surface treatment with the treating agent, and the adhesive sheets of Examples 8 to 10 obtained by performing the back surface treatment with the treating agent containing sodium hydrogen carbonate, polyethylene wax and glycerin. , Powder fall was more prevented.
The adhesive sheet of Comparative Example 1 obtained without performing the back surface treatment was not prevented from falling off.
Although the antistatic agent was not included, the adhesive sheet of Comparative Example 2 obtained by subjecting the back surface treatment to a processing agent containing polyethylene wax as a lubricant and glycerin as a water retention agent also did not prevent powder falling.

It is sectional drawing which shows one Embodiment of the adhesive sheet of this invention. It is a top view which shows the surface of the pressure sensitive adhesive layer of the adhesive sheet of FIG. It is sectional drawing which shows one Embodiment of the adhesive sheet with a surface sheet of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Adhesive sheet with a surface sheet 1a Adhesive sheet 1b Surface sheet 10 Adhesive substrate 11 Adhesive substrate support 12 Pressure sensitive adhesive layer 13 Adhesive layer 14 Binder resin layer 20 Release substrate 20a Back surface 21 Release substrate support 22 Release agent layer 30 Surface substrate 30a Surface 40 Adhesion suppression layer

Claims (7)

An adhesive sheet having an adhesive substrate and a release substrate,
The adhesive substrate is provided on one surface of the adhesive substrate support, the adhesive substrate support, the pressure-sensitive adhesive layer containing the adhesive force control agent, and the other of the adhesive substrate support. An adhesive layer provided on the surface and adjacent to the release substrate;
An adhesive sheet, wherein the release substrate is impregnated or coated with a treatment liquid containing an antistatic agent on the surface opposite to the adhesive substrate side.   The adhesive sheet according to claim 1, wherein the antistatic agent is sodium hydrogen carbonate or sodium chloride.   The adhesive sheet according to claim 1 or 2, wherein the treatment liquid further contains a lubricant.   The adhesive sheet according to claim 3, wherein the lubricant is a polyolefin-based wax.   The adhesive sheet according to claim 4, wherein the polyolefin wax is polyethylene wax.   The adhesive sheet according to any one of claims 1 to 5, wherein the treatment liquid further contains a water retention agent.   An adhesive with a surface sheet comprising the adhesive sheet according to any one of claims 1 to 6 and a surface sheet that is detachably bonded to a part or all of the pressure-sensitive adhesive layer of the adhesive sheet. Sheet.

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