JP2008007172A - Interleaving paper for glass plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide interleaving paper for a glass plate capable of preventing scratches on a glass plate surface, reducing the quality deterioration of the glass plate, and reducing breakage caused by the scratch. <P>SOLUTION: A coating layer including foam microcapsules is formed at at least one side of a sheet object. It is preferable that an amount of a foam-microcapsule coating is 0.05-2 g/m<SP>2</SP>. It is preferable that the coating layer includes an antistatic agent, or the coating layer including the antistatic agent is provided. Furthermore, air-permeable resistance is preferably 20,000 seconds or smaller. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a slip sheet sandwiched between glass plates during transportation and storage of the glass plates. More specifically, the present invention relates to a slip sheet for a glass plate that prevents damage to the surface of the glass plate and is excellent in workability in the process of laminating and storing a plurality of glass plates.

  Conventionally, when a glass plate is transported or stored, a sheet-like material called a slip sheet is sandwiched between the glass plates. The purpose of this interleaving paper is to prevent the glass plates from coming into direct contact with each other during transportation and storage, or to generate minute foreign matter attached to the glass plate surface by rubbing with the glass plate. It is to prevent scratches.

  Recently, a large-screen flat panel display using liquid crystal and plasma technology has made remarkable progress. However, in the case of the flat panel display glass plate used here, the area of the glass plate is steadily expanding. In connection with this, when conveying the glass plate for flat panels and displays, protecting the surface has become an important subject. In particular, scratches caused by foreign matter adhered to the surface of the glass plate not only impair the performance of the glass plate for flat panels and displays, but also in the case of large flat panel and display glass plates. There is a risk that it becomes damaged.

  Patent Documents 1, 2, and 3 propose slip sheets using wood fibers as slip sheets for glass plates for flat panels and displays. However, these interleaving papers have not been devised with respect to the scratches on the surface of the glass plate, and a serious problem is that the glass plate is scratched.

  On the other hand, Patent Documents 4 and 5 propose using foamed polyethylene as a slip sheet. When a sheet having a very low density and cushioning properties such as foamed polyethylene is used, the scratches on the glass plate are reduced. This is presumed to be because minute foreign matter adhering to the surface of the glass plate, which causes scratches, is wrapped in a cushioning sheet. In other words, when there is no interleaving paper or when interleaving paper such as paper is used that has little cushioning properties, minute foreign matter forms protrusions on the glass plate that is in contact with it and causes scratches. When the sheet is used, it is considered that the foreign matter itself is buried in the sheet and does not become a protrusion and a scratch is not generated on the glass plate. In addition, since the resin sheet such as foamed polyethylene has very high adhesion to the glass plate, the glass plate and the resin sheet are less likely to slip, and as a result, the effect of less rubbing during transportation and storage is also expected. It is. For this reason, even if there is a foreign object between the glass plate and the slip sheet, it is considered that the generation of scratches is reduced.

  However, resin sheets such as foamed polyethylene have some major problems as described below. One of them is that it does not absorb moisture at all. The temperature of the glass plate may change during transportation and storage, and this change in temperature may cause water vapor contained in the air to condense and adhere to the surface of the glass plate, thereby significantly reducing the cleanliness of the glass plate. . A sheet that does not absorb moisture at all, such as a resin sheet, cannot prevent this dew condensation, which is a serious problem. In addition, when moving the laminated glass plates, it was possible to suck and convey the glass plate through the sheet with a breathable sheet such as a slip sheet using wood fibers, but this was not possible with a resin sheet without breathability. There was a problem that I couldn't.

  In addition, a resin sheet such as foamed polyethylene has a problem that a large burden is placed on the environment upon disposal. That is, if these sheets are discarded by incineration, the incinerator may be damaged due to high combustion calories, and further raising the black smoke becomes a pollutant, causing air pollution. On the other hand, even when discarded by landfill treatment, there is a problem that it remains in the soil as it is because it is difficult to decompose both biologically and chemically and is bulky. In terms of environmental resources, the main raw material for resin sheets is fossil fuel, so the use of limited fossil fuels should be minimized. For this reason, there has been a strong demand for slip sheets using renewable resources, such as slip sheets using wood fibers.

JP 59-212269 A JP 2003-41498 A JP 2005-248409 A JP 09-132263 A JP-A-2005-75366

  It is an object of the present invention to provide a slip sheet for a glass plate that can prevent scratches on the surface of the glass plate and can reduce damage caused by deterioration of the quality of the glass plate and scratches.

  That is, the invention according to claim 1 of the present invention is a glass sheet interleaving paper characterized in that a coating layer containing foamable microcapsules is provided on at least one surface of a sheet-like material.

The invention according to claim 2 of the present invention is the interleaving paper for glass plate according to claim 1, wherein the coating amount of the foamable microcapsule is 0.05 g / m ² to ² g / m ^2. .

  The invention according to claim 3 of the present invention is the interleaving paper for a glass plate according to any one of claims 1 and 2, wherein the coating layer contains an antistatic agent.

  The invention according to claim 4 of the present invention is characterized in that a coating layer containing an antistatic agent is further provided on the surface of the coating layer containing foamable microcapsules. It is a paper for glass plates as described in an item.

  The invention according to claim 5 of the present invention is characterized in that the air permeation resistance specified in JIS P-8117 is 20000 seconds or less. Paper.

  According to the present invention, it is possible to obtain a slip sheet for a glass plate that has an excellent effect of preventing scratches on the glass plate and is excellent in workability. The interleaving paper for glass plate according to the present invention can be suitably used particularly for glass plates for flat panel displays such as liquid crystal panel displays, plasma displays, electroluminescence displays and field emission displays.

  In the interleaving paper for glass plate of the present invention, it is necessary to provide a coating layer containing foamable microcapsules on at least one side of the sheet-like material. By containing the foamable microcapsules in the coating layer, the ability to prevent scratches on the glass plate is dramatically improved. This is due to the shape and properties of the coating layer containing the foamable microcapsules. The coating layer containing the foamable microcapsules has a shape in which the foamed microcapsules are bonded to the substrate. For this reason, when it uses as a glass board interleaving paper, a gap | interval arises between a sheet-like material and the interleaving paper for glass boards by this foamed microcapsule. This gap can be adjusted by the particle size and expansion ratio of the foamable microcapsules. Since foreign substances that cause scratches can be taken into this gap, the occurrence of scratches can be suppressed. In other words, since the foreign matter is taken into the gap, even if the slip sheet and the glass plate are rubbed, the foreign matter is not rubbed against the glass plate with a strong pressure, so that scratches are less likely to occur. That is, it is considered that the foamable microcapsule plays a role of a so-called spacer. According to the present invention, in addition to the effect of the shape of the foamed microcapsules, there is also an effect of making the glass plate and the slip sheet difficult to slip. For this reason, by providing a foamable microcapsule on the surface of the sheet-like material, the static friction coefficient and the dynamic friction coefficient between the glass plate and the interleaf can be dramatically increased. As a result, it is greatly reduced that the foreign material is rubbed between the glass plate and the interleaf paper, so that there is an effect that generation of a scratch is suppressed.

  The foamable microcapsule used in the present invention is a microcapsule having a property that the particle diameter increases by heating. Generally, a thermoplastic polymer is used for the shell and the hydrocarbon is included. By applying heat to this, the softening of the shell occurs, and at the same time, the encapsulated hydrocarbon starts to gasify and the internal pressure increases, and the microcapsules foam. Examples of the encapsulated hydrocarbon include, but are not limited to, low-boiling hydrocarbons such as n-butane, pentane, and neopentane. As the shell, there are those using a thermoplastic polymer whose main component is a (meth) acrylic acid ester such as vinylidene chloride, acrylonitrile, methyl methacrylate, an aromatic vinyl compound such as styrene, an acrylic copolymer or the like. It is not limited to this. Expandable microcapsules are commercially available, for example, under the trade names “Expansel WU”, “Expansel DU”, “Expansel DE”, etc. from Expansel. In addition, Matsumoto Yushi Seiyaku Co., Ltd. sells products corresponding to various foaming temperatures under the trade name “Matsumoto Microsphere F”. Of course, the foamable microcapsule used in the present invention is not limited to this.

  In the present invention, the foaming microcapsules are contained in the coating layer by a method in which the microcapsules before foaming are contained in a paint and applied to a sheet-like material. In this case, it can be made to foam by heating after application. Alternatively, as another method, there is a method in which a foamed microcapsule is contained in a paint and applied to a sheet. Any method may be used in the present invention. Examples of the foamed microcapsules include “Matsumoto Microsphere F-30E”, “Matsumoto Microsphere F-50E”, “Matsumoto Microsphere F-80E”, etc., manufactured by Matsumoto Yushi Seiyaku Co., Ltd. A microcapsule that has already been foamed has a low specific gravity, and when applied, the microcapsule floats, resulting in poor coating stability. Therefore, a method using a microcapsule before foaming is preferred.

  When the foamable microcapsules themselves do not have adhesiveness to the sheet-like material, it is necessary to adhere the foamable microcapsules to the sheet-like material using a binder. As the binder, commonly used binders can be used. For example, various modified starch, polyvinyl alcohol, polyacrylic acid, polyvinyl pyrrolidone, polyacrylamide, maleic acid copolymer, gelatin, carboxymethyl cellulose derivative, sodium alginate, gum arabic, casein, soybean protein, styrene-butadiene latex, acrylonitrile Examples thereof include, but are not limited to, butadiene latex, methyl methacrylate-butadiene latex, acrylic latex, vinyl acetate latex, urethane latex, nitrile-butadiene latex, vinyl chloride latex, and acrylic resin. Two or more of these binders may be mixed and used as necessary.

The foamable microcapsule is preferably provided at 0.05 to ² g / m ² as a solid content on at least one surface of the substrate. If it is less than 0.05 g / m ² , a sufficient effect of preventing scratches cannot be ensured. Further, not only the effect is unchanged cost disadvantage be provided more than 2 g / m ^2, the machine workability may be deteriorated. Although a coating layer can also be provided on both surfaces of a base material as needed, as for the coating amount in this case, the lower limit of the single-sided coating amount in a double-sided coating layer does not become less than 0.05 g / m < ² >. Care is taken so that the total of the upper limit values is within 2 g / m ² .

In the present invention, the surface resistivity can be adjusted by applying an antistatic agent to the coating layer. The surface specific resistance value is preferably adjusted to 1 × 10 ⁶ to 1 × 10 ¹⁴ Ω. When manufacturing a glass plate, there is a step of peeling the slip sheet from the glass plate. However, if the surface resistivity of the glass slip sheet is too higher than 1 × 10 ¹⁴ Ω, peeling may become difficult and productivity may deteriorate. This is not preferable. Moreover, if it is less than 1 × 10 ⁶ Ω, there is a risk that the paper may be peeled off or displaced even in a step other than the step of peeling.

  As the antistatic agent used in the present invention, generally used antistatic agents can be used. For example, anionic low molecular weight antistatic agents such as carboxylic acids, sulfonates, sulfates, etc. Cationic low molecular weight antistatic agents such as quaternary ammonium salts, phosphonium salts, sulfonium salts, polyhydric alcohol derivatives, polyalkylene oxide derivatives, etc. Nonionic low-molecular antistatic agents, amphoteric antistatic agents, boron compounds, nitrogen-containing compounds, sulfur-containing compounds, antistatic agents such as guanidine salts, complex compound-based antistatic agents, aliphatic compounds, aromatic compounds, etc. Antistatic plasticizer, polyethylene oxide, quaternary ammonium base-containing (meth) acrylate copolymer, sodium polystyrene sulfonate, carbobetaine graft copolymer, polymer charge transfer binder, etc. , Non-ionic interfaces such as glycerin fatty acid ester and polyoxyethylene alkyl ether Antistatic agent, anionic surfactant type antistatic agent such as alkyl sulfonate and alkylbenzene sulfonate, cationic surfactant type antistatic agent such as tetraalkylammonium salt and trialkylbenzylammonium salt, Amphoteric surfactant type antistatic agent such as alkylbetaine, alkylimidazolium betaine, conductive polymer such as polyacetylene, polyparaphenylene, polypyrrole, polythiophene, polyaniline, polyphenylene vinylene, metal filler such as aluminum, copper, nickel, iron , Carbon, conductive whisker, and the like, but are not limited thereto. These antistatic agents may be used as a mixture of two or more if necessary.

  As a method for applying the antistatic agent, the antistatic agent may be mixed with the paint or applied, or a coating layer including an antistatic layer may be provided separately. There is no particular limitation as to where the antistatic layer is provided. You may provide in the upper surface of the coating layer containing a foamable microcapsule, and may provide in a lower layer. However, since it is more effective if the antistatic agent is present on the surface, it is advantageous to adjust the surface resistivity by providing an antistatic layer on the surface layer provided with a coating layer containing microcapsules.

  Although there is no limitation in particular regarding the sheet-like material used by this invention, the sheet-like material which has a vegetable fiber as a main component from the point of air permeability resistance is preferable. As plant fibers used for the sheet-like material, softwood bleached kraft pulp (NBKP), hardwood bleached kraft pulp (LBKP), softwood bleached sulfite pulp (NBSP), thermomechanical pulp (TMP), groundwood pulp (GP) And other non-wood pulps such as straw, bamboo, kenaf, bagasse, cotton and linter can be used alone or in combination as appropriate. Furthermore, synthetic pulp, synthetic fiber, semi-synthetic fiber, inorganic fiber and the like can be used in appropriate combination as required.

  As a papermaking auxiliary material used for papermaking, any of those generally used as a papermaking auxiliary material can be used as necessary. For example, starch, modified starch, polyvinyl alcohol, polyacrylamide, guar gum, modified guar gum, acrylic resin, styrene / maleic acid resin, polyamide epoxy resin, melamine resin, polyamide / epichlorohydrin resin, polyamine / epichlorohydrin resin, modified polyacrylamide resin, Paper strength enhancer such as polyvinylamine / polyamide epoxy resin, acrylamide / acrylic acid resin, rosin sizing agent, alkyl ketene dimer sizing agent, alkenyl succinic acid sizing agent, styrene sizing agent, olefin sizing agent, Styrene / acrylic sizing agent, higher fatty acid sizing agent, styrene / maleic acid sizing agent, styrene / olefin sizing agent, acrylate / olefin sizing agent, acrylate sizing agent In addition to sizing agents, acrylic / fatty acid sizing agents, silicone sizing agents, etc., kaolin, clay, talc, calcium carbonate, titanium oxide, zinc oxide, silica, magnesium carbonate, magnesium hydroxide, aluminum hydroxide, etc. Organic fillers such as inorganic fillers, styrene / acrylic copolymers, styrene copolymers, acrylic copolymers, various dyes, pigments, fluorescent dyes, antifoaming agents, yield improvers, drainage improvers, formation improvers, Examples include antiseptics and antifungal agents.

  As a method for providing a coating layer on a substrate in the present invention, a size press coater, a gate roll coater, a shim sizer, a bill blade coater, a rod and blade metering coater, an air knife coater, a roll coater, a reverse roll coater, a bar coater, Various coaters such as a rod coater, a blade coater, a curtain coater, a gravure coater, a die slot coater, and a short dwell coater, a dipping machine, and various printing machines can be used, but the present invention is not limited thereto.

  In the present invention, the air resistance of the interleaving paper for glass plate is preferably 20000 seconds or less. If the air permeability resistance exceeds 20000 seconds, it is not preferable because suction conveyance becomes difficult.

  In the present invention, general papermaking chemicals can be used for the coating layer as long as the performance is not impaired. For example, surface sizing agents, antifoaming agents, surface paper strength agents, leveling agents, water resistance agents, inorganic fillers such as titanium oxide, talc, kaolin and calcium carbonate, organic fillers such as plastic pigments, anti-slip agents, dispersants, viscosity A regulator or the like can be added to the coating layer as an additional component. Also, if necessary, chemicals that reduce the phenomenon of coloring the glass surface called paper burn, such as sodium chloride, sodium tripolyphosphate, zeolite, sodium tetraborate, polyhydric alcohol, alkylene oxide adduct of polyhydric alcohol, etc. These chemicals can be added in the same way. Addition of water-soluble polymers such as starch, modified starch, polyvinyl alcohol, carboxymethyl cellulose, polyacrylic acid, polyacrylamide, and polyethylene oxide makes it easier to remove dirt adhering to the glass. Since molecules are generally easy to absorb water, they are effective in preventing condensation, and therefore can be preferably used. The chemicals described above can be applied as a new coating layer in addition to being used for the coating layer containing the foamable microcapsules.

EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited by these.
[Example 1]
As wood pulp, 50% by mass of hardwood bleached kraft pulp and 50% by mass of softwood bleached kraft pulp were used. This was beaten with a double disc refiner to prepare a raw pulp slurry having a beating degree of 500 ml according to Canadian Standard Freeness. An epichlorohydrin-based wet paper strength enhancer (trade name “Polyfix 259”, manufactured by Showa Polymer Co., Ltd.) is added to the raw pulp slurry at a solid concentration of 0.5% by mass with respect to the pulp mass, and a rosin sizing agent (trade name) “Sizing agent AL1203” (manufactured by Seiko PMC) was added at a solid content concentration of 0.5 mass% with respect to the pulp mass, and 3 mass% of aluminum sulfate was added to prepare a raw slurry. The raw material slurry was paper-made by a conventional method using a long paper machine to a basis weight of 40 g / m ² to obtain a paper substrate. Next, an acrylic resin binder (trade name “NACRILIC 125-4280” manufactured by Nippon SC Co., Ltd.) and foaming microcapsules before foaming (trade name “Matsumoto Microsphere F-30”, Matsumoto Yushi Seiyaku Co., Ltd. )) Is added to the solid content of the acrylic resin binder so that the solid content concentration is 10% by mass and mixed to prepare a foamable microcapsule in the coating layer by this coating liquid. The solid content is 1.0 g / m ^{2 on} both sides of the sheet (0.5 g / m ^{2 on} one side) and is applied by hand using a Mayer bar to the paper substrate obtained above. 50 g / m ² of interleaf paper for a glass plate was obtained. In addition, when applying and drying a coating liquid on a sheet-like thing, it dried by making dry conditions into 140 degreeC 1 minute so that a foamable microcapsule might fully foam.

[Example 2]
A glass plate having a basis weight of 50 g / m ^{2 in} the same manner as in Example 1 except that polyvinyl alcohol (trade name “GOHSENOL N-300” manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) was used instead of the acrylic resin binder. A slip was obtained.

[Example 3]
A basis weight of 50 g / m ² was obtained in the same manner as in Example 1 except that a styrene-butadiene latex (trade name “Smartex SN-309” manufactured by Nippon A & L Co., Ltd.) was used instead of the acrylic resin binder. A slip sheet for glass plate was obtained.

[Example 4]
A glass plate having a basis weight of 50 g / m ^{2 in} the same manner as in Example 1 except that modified starch (trade name “Petrosize L-2B” manufactured by Nissho Chemical Co., Ltd.) was used instead of the acrylic resin binder. A slip was obtained.

[Example 5]
In the same manner as in Example 1, except that an antistatic agent (trade name “Chemist SA-9” manufactured by San Nopco Co., Ltd.) was added to the foaming microcapsule in an amount of 1% by mass in the solid content of the coating liquid. A slip sheet for glass plate having an amount of 50 g / m ² was obtained.

[Example 6]
An antistatic agent layer in which the antistatic agent used in Example 5 was 0.1 g / m ² in terms of solid mass was provided by hand coating on the glass interleaving paper obtained in Example 1, and the basis weight was 50.1 g. A glass sheet for glass plate of / m ² was obtained.

[Example 7]
45 g / m ² glass plate in the same manner as in Example 1 except that the foamable microcapsule solid content in the coating layer is 0.5 g / m ² on one side and the coating layer is provided only on one side. A slip was obtained.

[Example 8]
40.5 g / m ² of glass in the same manner as in Example 1 except that the solid content mass of the foamable microcapsule in the coating layer was 0.05 g / m ² on one side and the coating layer was provided only on one side. A board slip was obtained.

[Example 9]
60 g / m ² interleaving paper for glass plates is obtained in the same manner as in Example 1 except that the foamable microcapsule solid content in the coating layer is 2 g / m ^{2 on} both sides (1 g / m ^{2 on} one side). It was.

[Comparative Example 1]
A coating liquid containing only an acrylic resin binder (trade name “Nacrylic 125-4280” manufactured by Nippon SC Co., Ltd.) was applied to the paper substrate obtained in Example 1 at 10 g / m ^{2 on} both sides (5 g / m on one side). m ² ) to obtain a slip sheet for glass plate having a basis weight of 50 g / m ² .

[Comparative Example 2]
Except that expandable microcapsule solids of coating layer is only 0.01 g / m ² on one surface in the same manner as in Example 1, to obtain a glass plate for slip sheet having a basis weight of 40.1 g / m ² It was.

[Comparative Example 3]
In the same manner as in Example 1 except that the foamable microcapsule solid content in the coating layer was 0.06 g / m ^{2 on} both sides, and the coating layer on one side was 0.03 g / m ² , A slip sheet for a glass plate having an amount of 40.6 g / m ² was obtained.

[Comparative Example 4]
For comparison, a commercially available foamed polyethylene resin sheet (trade name “Miramat A” manufactured by JSP Corporation) was tested in the same manner.

  Table 1 shows the performance evaluation results of the glass sheet slip sheets obtained in Examples 1 to 9 and Comparative Examples 1 to 4. The performance evaluation was performed by the following methods for the dew condensation state, the scratch resistance, and the air resistance. Those having a pass level or higher in all of the dew condensation state and scuffing prevention performance were evaluated as acceptable as the glass sheet for the present invention. Air permeability resistance is an item that is not necessarily required, and was measured as a reference value. A material having a low air resistance can be sucked and conveyed and is advantageous for preventing condensation.

<Condensation state>
A glass plate for a liquid crystal display panel (thickness 0.7 mm, length and width 100 mm × 100 mm) at 25 degrees 80% R.D. H. For 4 hours, and in that environment, the glass plate and the interleaving paper for glass plate (110 mm × 110 mm) obtained in the examples and comparative examples are alternately stacked one by one, and the laminated glass plate and glass interleaving paper A body was obtained (10 sheets of glass plate, 11 sheets of glass interleaving paper, and the uppermost and lowermost sheets were interleaving paper for glass sheet). Thereafter, the laminate was tied and fixed with a rubber string, placed in a plastic bag, sealed, and left in an atmosphere of 17 degrees for 3 hours. Thereafter, the rubber string was unwound and the state of condensation on the surface of the glass plate was judged visually. The evaluation criteria for the state of dew condensation were as follows, and Δ or higher was regarded as acceptable.
○: No condensation is observed.
Δ: Condensation is observed on less than 3 out of 10 glass plates.
X: Condensation is observed on 3 or more of 10 glass plates.

<Abrasion prevention performance>
Glass plates for liquid crystal display panels (thickness 0.7 mm, vertical and horizontal 100 mm × 200 mm) and glass sheets for glass plates (vertical and horizontal 110 mm × 110 mm) obtained in Examples and Comparative Examples are alternately stacked one by one. A laminate of sheet interleaving paper was obtained (10 sheets of glass plate, 11 sheets of interleaving sheet for glass sheet, and the uppermost and the lowermost were interleaving sheets for glass sheet). The laminate was tied and fixed with a rubber string, and vibration was applied for 8 hours with a shaker (trade name “Lab Shaker” manufactured by ASONE Co., Ltd.). Thereafter, the rubber string was unwound and fine scratches on the glass surface were confirmed using a microscope. The evaluation criteria for the state of occurrence of scratches were as follows, and Δ or higher was regarded as acceptable.
○: The occurrence of scratches cannot be confirmed.
Δ: 1 or less occurrence of scratches in 10 glass plates ×: 2 or more occurrences of scratches in 10 glass plates

<Air permeability resistance>
The air resistance of Examples and Comparative Examples of the glass sheet interleaving paper was measured according to JIS P-8117 and shown in Table 1. The air permeability resistance was 20000 seconds or less, and the air resistance resistance was more than 20000 seconds.

<Table 1>

The slip sheet for glass plate according to the present invention can prevent scratches on the surface of the glass plate, and can reduce damage due to degradation of the quality of the glass plate and scratches. Therefore, the slip sheet for glass plates, particularly liquid crystal panel displays and plasmas. It can be suitably used as a glass sheet for flat panel displays such as displays, electroluminescence displays, field emission displays and the like.

Claims (5)

An interleaving paper for a glass plate, wherein a coating layer containing foamable microcapsules is provided on at least one surface of a sheet-like material. The glass sheet interleaving paper according to claim 1, wherein the coating amount of the foamable microcapsule is 0.05 g / m ² to ² g / m ² . The slip sheet for a glass plate according to any one of claims 1 to 2, wherein the coating layer contains an antistatic agent. The interleaving paper for glass plates according to any one of claims 1 to 3, wherein a coating layer containing an antistatic agent is further provided on the surface of the coating layer containing foamable microcapsules. 5. The glass sheet interleaving paper according to claim 1, wherein the air permeation resistance defined in JIS P-8117 is 20000 seconds or less.