JP2017066576A - Glass interleaving paper, glass plate laminated body, and glass plate package body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide: glass interleaving paper which is interposed between a plurality of glass plates when laminating the glass plates and is suppressed from transferring foreign matter derived from the glass interleaving paper to the plass plates; a glass plate laminated body suppressed from causing occurrence of defects in devices when using the glass plates after transportation, storage, and the like, the defects being due to foreign matter derived from the glass interleaving paper; and a glass package body having the glass plate laminated body packed.SOLUTION: Provided are: glass interleaving paper interposed between glass plates when laminating a plurality of glass plates, comprising substrate paper and a coating layer formed on at least one principal surface of the substrate paper, the coating layer containing a water-soluble cationic polymer having cationic groups and an average molecular weight of 2 million to 1 million; a glass plate laminated body formed by laminating a plurality of glass plates so that the glass interleaving paper is interposed between the plass plates; and a glass plate package body having a packaging container and the glass plate laminated body accommodated in the container.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a glass interleaving paper, a glass plate laminate, and a glass plate package.

  In recent years, there has been a growing need for larger glass plates used for electronic devices such as flat panel displays such as glass substrates for liquid crystal displays and glass substrates for plasma displays, organic EL lighting, and solar cells.

  Such a glass plate is processed into a plate shape, and is usually laminated with glass interleaving paper sandwiched between glass plates for the purpose of protecting the surface of the glass plate from generation of scratches and contamination with foreign substances. Transported or stored at the factory where it is processed. Here, “glass interleaving paper” refers to paper sandwiched between glass plates.

  However, in the method of interposing glass interleaving paper between the glass plates, the foreign matter in the glass interleaving paper is transferred to the glass plate, and a defect due to the foreign matter occurs when a device is formed on the glass plate. It was. Therefore, Patent Document 1 describes a method of providing a coating agent layer by coating an organic acid salt such as an alginate on a glass interleaving paper in order to suppress transfer of a metal foreign substance among foreign substances.

JP 2014-118663 A

  In the method described in Patent Document 1, the transfer of foreign matter, particularly metal foreign matter, from the glass interleaf to the glass plate can be suppressed by providing the coating agent layer, but it is not always sufficient. In particular, it has been difficult to say that the transfer of foreign matter is sufficiently suppressed in a glass plate used for display panels that have recently been improved in definition. Furthermore, in Patent Document 1, the coating agent itself is weakly bonded to the glass slip sheet, and the coating agent itself may be transferred to the glass plate, and it is necessary to sufficiently wash the glass plate in order to remove the coating agent. was there.

  The present invention has been made in order to solve the above-described problem, and in a glass interleaving paper interposed between glass plates when laminating a plurality of glass plates, a foreign matter resulting from the glass interleaving onto the glass plate A glass interleaving paper in which the transfer of the ink is sufficiently suppressed is provided. In addition, in a glass plate laminate in which a plurality of glass plates are laminated with glass interleaving paper interposed between the glass plates, the device of the foreign material caused by the glass interleaving paper at the time of use of the glass plate after being transported, stored, etc. It aims at providing the glass plate laminated body by which generation | occurrence | production of the defect was suppressed, and the glass plate package by which this glass plate laminated body was packed.

  The glass interleaving paper of the present invention is a glass interleaving paper interposed between glass plates when laminating a plurality of glass plates, and is formed on at least one main surface of the base paper and the base paper. And a coating layer containing a water-soluble cationic polymer having a cationic group and an average molecular weight of 2 to 1,000,000.

The glass plate laminate of the present invention is formed by laminating a plurality of glass plates so that the glass interleaving paper of the present invention is interposed between the glass plates.
The glass plate package of the present invention has a packaging container and the glass plate laminate of the present invention housed in the container.

  According to the present invention, in the glass interleaving paper interposed between the glass plates when laminating a plurality of glass plates, the glass interleaving paper in which transfer of foreign matters due to the glass interleaving onto the glass plate is sufficiently suppressed is provided. Can be provided. In addition, in a glass plate laminate in which a plurality of glass plates are laminated with glass interleaving paper interposed between the glass plates, the device of the foreign material caused by the glass interleaving paper at the time of use of the glass plate after being transported, stored, etc. It is possible to provide a glass plate laminate in which the occurrence of defects is suppressed and a glass plate package in which the glass plate laminate is packed.

It is sectional drawing which shows schematic structure of an example of the glass interleaving paper of embodiment of this invention. It is sectional drawing which shows schematic structure of an example of the glass plate laminated body using the glass interleaving paper of embodiment of this invention. It is a figure which shows notionally a part of example of a glass interleaf manufacturing apparatus. It is a side view which shows schematic structure of an example of the glass plate package of embodiment of this invention. It is a side view which shows schematic structure of another example of the glass plate package of embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, this invention is not limited to the following embodiment.

[Glass interleaving paper]
FIG. 1 is a cross-sectional view illustrating a schematic configuration of an example of a glass slip sheet according to an embodiment of the present invention. A glass interleaving paper 1 shown in FIG. 1 includes a base paper 3 and a coating layer 2 containing a water-soluble cationic polymer having a cationic group and an average molecular weight of 2 to 1,000,000 formed on one main surface 3a thereof. Consists of. The water-soluble cationic polymer having a cationic group and having an average molecular weight of 2 to 1,000,000 is hereinafter also referred to as “cationic polymer (A)”. FIG. 2 is a cross-sectional view showing a schematic configuration of an example in which the glass interleaving paper according to the embodiment of the present invention is used for a glass laminate. The glass plate laminate 10 shown in FIG. 2 has a configuration in which five pieces of glass interleaving paper 1 and glass plates 4 are alternately laminated.

  In the glass interleaving paper 1 shown in FIG. 1, the coat layer 2 is formed on one main surface 3 a of the base paper 3. In the glass interleaving paper of the present invention, the coating layer may be formed on both main surfaces of the base paper as necessary, or may be formed on the entire surface including the side surfaces. The glass interleaving paper of the present invention has a coat layer containing the cationic polymer (A), and thus sufficiently suppresses transfer of foreign matters resulting from the glass interleaving paper to the glass plate when a glass plate laminate is formed. Is possible. Further, since the coating layer 2 is firmly formed on the base paper 3 so that the components are not easily dropped off, the amount of the coating layer component itself transferred to the glass plate is suppressed to a level with no problem. Further, even when the coating layer component is transferred to the glass plate, it can be easily washed by washing with water or a low-concentration alkaline solution.

  As for the glass interleaving paper 1 which has the coating layer 2 in the one main surface 3a of the base paper 3, the glass plate in which the glass interleaving paper of this invention is used is a glass plate for electronic devices, for example, and one main surface is It is preferably used for a glass plate in which an element such as a wiring or an electrode is formed on the main surface, and the other main surface is an element non-formation surface. In this case, the glass plate and the glass interleaving paper 1 are laminated so that the coating layer 2 of the glass interleaving paper 1 is in contact with the element forming surface of the glass plate. In this case, the principal surface 3b of the base paper 3 of the glass interleaving paper 1 that does not have the coat layer 2 is in contact with the element non-forming surface of the glass plate.

  In addition, when the suppression of transfer of foreign matter is required at a high level for both of the main surfaces of the glass plate, coat layers were formed on both main surfaces of the base paper among the glass interleaving papers of the present invention. Glass interleaving paper may be used.

  For example, in the glass plate laminate 10 shown in FIG. 2, the lower main surface 4 b of the glass plate 4 is an element forming surface and the upper main surface 4 a is an element non-forming surface. When the glass interleaving paper 1 in which the coating layer 2 is formed on one main surface 3a of the glass interleaving paper 1 is used, the glass interleaving paper 1 is disposed with the coating layer 2 facing upward. In this case, in the glass plate laminate 10, all the five glass interleaving papers 1 are arranged with the coat layer 2 facing upward, and all the five glass plates 4 are arranged with the element formation surface facing downward. .

  In the glass plate laminate 10, the shape and size of the main surface of the glass interleaving paper 1 may be at least as large as the main surfaces 4 a and 4 b of the glass plate 4. Normally, as shown in FIG. 2, the shape and size of the main surface of the glass interleaving paper 1 are such that the entire outer periphery is located outside the outer periphery of the main surface of the glass plate 4. From the viewpoint of suppressing the transfer of foreign matter from the glass interleaving paper to the element forming surface of the glass plate, the formation region of the coat layer 2 on the main surface 3a of the base paper 3 in the glass interleaving paper 1 is at least an area in contact with the glass plate 4 Should be included. However, in consideration of workability when laminating the glass interleaving paper 1 and the glass plate 4 and the productivity of the glass interleaving paper 1, in the glass interleaving paper 1, the coat layer 2 is formed on one main surface 3 a of the base paper 3. It is preferable to form the entire region.

  In the glass interleaving paper 1, the interface between the coat layer 2 and the base paper 3 is the position of the main surface 3 a of the base paper 3 before forming the coat layer 2. In the glass interleaving paper 1, the coat layer 2 is a layer containing the cationic polymer (A). Specifically, the coating layer 2 is formed using a composition for forming a coat layer described later containing the cationic polymer (A). It is a layer consisting of a solid content. Usually, the coat layer 2 is formed by applying the composition for forming a coat layer to the main surface 3a of the base paper 3 and drying it.

  In forming the coat layer 2, a part of the composition for forming the coat layer may be impregnated in the surface layer portion from the coated surface (main surface 3 a) of the base paper 3. And in the obtained glass interleaving paper 1, while having the coating layer 2 on the main surface 3a of the base paper 3, the surface layer part by the side of the coating layer 2 of the base paper 3 is between the paper fibers which comprise the base paper 3. In some cases, the base paper in which the constituent components of the coat layer 2 are filled and the mixed layer of the coat layer components are used. Further, the mixed layer may extend not only to the surface layer portion on the coat layer 2 side but also to the entire base paper 3. In the glass interleaving paper of the present invention, if the base paper and at least one main surface thereof have a coat layer containing the cationic polymer (A), the base paper includes the above-mentioned mixed layer in its category. .

(Base paper)
As the base paper 3 in the glass interleaving paper 1, papers of known materials and forms generally used as glass interleaving paper can be used without particular limitation. Examples of the shape and size of the base paper 3 include the same shape and size as those of the glass interleaving paper 1 in the glass laminate 10 described above. Specifically, for example, when used for a glass plate of the eighth generation size, it is the same size and shape (2200 mm × 2500 mm) as the glass plate, or the entire outer periphery of the main surface of the base paper is the main glass plate. Paper having a shape and size that is located outside the outer periphery of the surface can be used. The thickness of the base paper 3 can be about 0.01 to 0.2 mm, for example.

  The paper used as the base paper is obtained, for example, by papermaking a raw material mainly composed of pulp. The pulp used as the raw material of the base paper is chemical pulp such as kraft pulp (KP), sulfite pulp (SP), soda pulp (AP), semi-chemical pulp (SCP), semi-chemical pulp (CGP), etc. Chemical pulp, groundwood pulp (GP), thermomechanical pulp (TMP, BCTMP), refiner Grandwood pulp (RGP) and other mechanical pulp, non-wood fiber pulp, synthetic pulp, etc. Is mentioned.

  Pulp may be used alone or in combination of two or more, or may contain cellulose or the like. These raw materials may be used paper, virgin pulp, or a mixture of used paper and virgin pulp. Among these, virgin pulp is preferable.

The properties of the base paper are the same as those of ordinary glass interleaving paper obtained by a usual method, for example, a weighed value of about 1 to 60 g / m ² , a smoothness of about 1 to 40 sec, and an air permeability of 1. About 0 to 100 sec and pH of about 3 to 7 are preferable.

(Coat layer)
The coat layer 2 in the glass interleaving paper 1 contains a cationic polymer (A), that is, a water-soluble cationic polymer having an average molecular weight of 2 to 1,000,000. In the present specification, the average molecular weight means a weight average molecular weight (MW) in terms of polystyrene by gel permeation chromatography unless otherwise specified. Moreover, in this specification, water-soluble means the property which melt | dissolves a test substance 1 mass% or more with respect to the pure water of normal temperature (25 degreeC) (turbidity is not recognized as a solution).

  The coating layer 2 in the glass interleaving paper 1 is preferably composed only of the cationic polymer (A), but may contain components other than the cationic polymer (A) as necessary within a range not impairing the effects of the present invention. .

  The cationic polymer (A) preferably has a plurality of cationic groups in the molecule and substantially has no anionic group. Specific examples of the cationic group in the cationic polymer (A) include an amino group and a quaternary ammonium group. When the cationic polymer (A) has these cationic groups, it becomes easy to be electrically bonded to the surface of the base paper. The cationic polymer (A) does not substantially have an anionic group, for example, an anionic group except for an amount in which an anionic group contained in a raw material compound, a polymerization initiator or the like remains slightly. It means not containing.

  The surface of the base paper used for glass interleaving paper is usually negatively charged. When a coat layer is formed on the surface of such a base paper using the cationic polymer (A), the cationic group of the cationic polymer (A) is electrically bonded to the surface of the base paper, so that the surface of the base paper is A glass interleaving paper having a firmly fixed coating layer is obtained. The number of cationic groups in the cationic polymer (A) is such that the cationic group of the cationic polymer (A) is electrically bonded to the base paper, so that the coating layer containing the cationic polymer (A) can be easily removed from the base paper. A number that results in a structure that does not peel off is preferred. The number of cationic groups contained in the cationic polymer (A) is usually represented by the average number of cationic groups per 1000 molecular weight.

  Hereinafter, the average number of cationic groups that the cationic polymer (A) has per 1000 molecular weight is referred to as “cationic group density”, and the unit is represented by [eq / MW1000]. Specifically, the cationic group density in the cationic polymer (A) is preferably 3 to 40 [eq / MW1000].

  If the cationic group density is 40 [eq / MW1000] or less, even if the cationic polymer (A) is transferred to a glass plate, it can be easily removed by washing. If it is 3 [eq / MW1000] or more, the cationic polymer (A) is easily electrically coupled to the surface of the base paper. The cationic group density is more preferably 30 [eq / MW1000] or less. The cationic group density is more preferably 3.5 [eq / MW1000] or more, and further preferably 5 [eq / MW1000] or more.

  The cationic polymer (A) may be a network polymer (A1) having a three-dimensional network structure or a chain polymer (A2). The chain polymer (A2) may have a side chain. The preferable average molecular weight and the number of cationic groups of the cationic polymer (A) largely depend on the molecular structure of the cationic polymer (A). Hereinafter, the cationic polymer (A) will be described according to the classification of the network polymer (A1) and the chain polymer (A2).

  When the cationic polymer (A) is the network polymer (A1), the cationic group is usually present on the surface and inside of the network polymer (A1). And in the glass interleaving paper 1 which has the coating layer 2 obtained using a network polymer (A1), the electrical coupling | bonding of the coating layer 2 and the base paper 3 in the interface 3a with the base paper 3 is a network polymer (A1). ) Is considered to be a bond formed by involving a cationic group on the surface. Therefore, when the network polymer (A1) is used, the network polymer (A1) having a relatively high cationic group density, specifically, 10 to 30 [eq / MW1000] is preferable, and 15 to 30 [eq / MW1000] is more preferable. In addition, when cationic polymer (A) is network polymer (A1), the network polymer (A1) which comprises a coating layer may be the 1 type (s) or 2 or more types.

  The average molecular weight of the network polymer (A1) is preferably 200 to 100,000, more preferably 200 to 10,000, and particularly preferably 200 to 2000. In the network polymer (A1), when the cationic group density is the same, the smaller the average molecular weight, the larger the specific surface area per molecule, and the cationic groups present on the surface with respect to the number of cationic groups present inside. The average molecular weight is preferably within the above range because the ratio of the number of the above becomes high.

  That is, in the network polymer (A1), when the cationic group density is the same, the obtained coat layer is more firmly fixed to the surface of the base paper when the average molecular weight is smaller. In addition, since the network polymer (A1) is water-soluble as described above, the network polymer (A1) can be easily removed from the glass plate even when the network polymer (A1) is transferred to the glass plate. It can be done. Specific examples of the removal method include scrub cleaning with pure water or a low-concentration alkaline solution.

  Specific examples of the network polymer (A1) include polyethyleneimine containing a 1,2, tertiary amine. A commercially available product may be used as the polyethyleneimine. As commercial products, for example, Epomin SP-003 (average molecular weight; about 300, cationic group density; 23.2 [eq / MW1000]), Epomin SP-006 (average) as trade names manufactured by Nippon Shokubai Co., Ltd. Molecular weight: about 600, cationic group density: 23.2 [eq / MW1000]) and the like.

  When the coat layer is composed of the network polymer (A1), the film thickness may be substantially equal to the molecular diameter. In that case, specifically, the thickness of the coat layer made of the network polymer (A1) is approximately 0.5 to 2.5 nm.

  When the cationic polymer (A) is a chain polymer (A2), the cationic group may be present in the main chain or in the side chain. In any case, the chain polymer (A2) is assumed to constitute the coat layer 2 by folding the main chain so that a part of the cationic group exists at the interface 3a with the base paper 3 of the coat layer 2. The

  When the chain polymer (A2) has a cationic group in the side chain, the degree of freedom is higher than in the case where the main chain has a cationic group at the position where the cationic group is present. Since it is difficult to control the position of the cationic group on the side chain, the chain polymer (A2) preferably has a cationic group in the main chain. The chain polymer (A2) having a cationic group in the main chain may have a side chain that does not have a cationic group. When the cationic polymer (A) is a chain polymer (A2), the chain polymer (A2) constituting the coat layer may be one kind or two or more kinds. Furthermore, you may comprise a coat layer combining 1 or more types of chain polymer (A2), and 1 or more types of network polymer (A1).

  When the chain polymer (A2) is used, the average molecular weight is preferably 1,000 to 1,000,000, and more preferably 10,000 to 100,000. The number of cationic groups present on the surface of the chain polymer (A2) can be increased as the average molecular weight increases. However, if the average molecular weight is too large, the main chain becomes long and the molecule tends to bend or fold, so the number of cationic groups present on the surface tends to decrease. If the average molecular weight is in the above range, the number of cationic groups present on the surface can be increased, which is preferable.

  When the chain polymer (A2) is used, the cationic group density is preferably 3 to 30 [eq / MW1000], more preferably 3.5 [eq / MW1000] or more, and 5 [eq / MW1000] or more. Further preferred. If the cationic group density is 30 [eq / MW1000] or less, even if the cationic polymer (A) is transferred to a glass plate, it can be easily removed by washing. If it is 3 [eq / MW1000] or more, the cationic polymer (A) is easily electrically coupled to the surface of the base paper.

  The chain polymer (A2) is also water-soluble like the network polymer (A1), so that the chain polymer (A2) is transferred from the glass plate even when the chain polymer (A2) is transferred to the glass plate. The polymer (A2) can be easily removed. Specific examples of the removal method include scrub cleaning with pure water or a low-concentration alkaline solution.

  Specific examples of the chain polymer (A2) include a chain polymer (A2) having a cationic group in the main chain, such as polydiallyldimethylammonium chloride, polydiallylamine, dimethylamine-epichlorohydrin condensate salt, dimethylamine. -Ammonia-epichlorohydrin condensate salt, dicyandiamide-formalin condensate salt, dicyandiamide-diethylenetriamine condensate salt and the like.

  Specific examples of the chain polymer (A2) having a cationic group in the side chain include poly (dimethylaminoethyl acrylate methyl chloride quaternary salt), poly (dimethylaminoethyl methacrylate methyl chloride quaternary salt), trimethylammonium. Examples include alkyl acrylamide polymer salts, polyallylamine, and polyvinylamidine.

  Commercial products may be used as these chain polymers (A2). As a commercial item, for example, polydiallyldimethylammonium chloride (PDAC or PDADMAC; an abbreviation of a compound in front of parentheses; the same applies hereinafter), FPA100L (trade name, manufactured by Senka Co., Ltd., average molecular weight: 20,000, Cationic group density: 6.2 [eq / MW1000]), as dimethylamine-epichlorohydrin condensate salt (DE), KHE104L (trade name, manufactured by Senka Corporation, average molecular weight: 100,000, cationic group density: 7.3 [Eq / MW1000]), as dimethylamine-ammonia-epichlorohydrin condensate salt (DNE), KHE100L (trade name, manufactured by Senka, average molecular weight; 100,000, cationic group density: 8.1 [eq / MW1000]) , Poly (dimethylaminoethyl methacrylate methyl chloride quaternary salt) ( As QEM), FPV1000L (trade name, Senka Co. Ltd., average molecular weight: unknown cationic group density; 3.7 [eq / MW1000]), and the like.

  When the coat layer is composed of the chain polymer (A2), the main chain of the molecule is folded so that a part of the cationic group exists at the interface with the base paper as described above, thereby constituting the coat layer. The film thickness can be appropriately adjusted by molecular design such as molecular chain length and cationic group density.

  By the way, when the glass interleaving paper has a coating layer on the base paper and at least one main surface thereof, the coating layer may provide a difference in film thickness depending on the location on the surface of the base paper to be formed. . For example, the coat layer may be an embossed surface as a whole. As another example, a thick portion may be provided in a linear shape so as to form a lattice shape as a whole in a plan view from the thickness direction of the coat layer. As another example, the coat layer may have a thin region and a thick region in an irregular positional relationship. Note that the film thickness of the coat layer at the boundary between these regions may change in a transitional manner or may change gradually.

  In this way, by providing a difference in the film thickness of the coat layer, the glass interleaving paper is on the coat layer side, a portion that easily contacts the glass plate (a portion that receives a large pressing force when contacted), and a glass plate And a portion that is difficult to contact (a portion that receives a small pressing force when contacted). Thereby, the part from which the foreign material from a glass interleaving paper is easy to transcribe | transfer and the part to which the foreign material from glass interleaving paper is difficult to transfer can be produced intentionally. And in the glass plate after laminating the glass plate and the glass interleaving paper and removing the glass interleaving paper, it is possible to efficiently deal with such as intensively washing the portion where the foreign matter transfer from the glass interleaving paper is easy. .

  Moreover, since the base paper and the coat layer are integrated in the glass interleaving paper, the base paper and the coat layer can be simultaneously removed by a single glass interleaf removal operation. Even if the coat layer is thin, the transfer of foreign matter from the glass interleaf to the glass plate is suppressed compared to the glass interleaf without the coat layer. In the portion where the film thickness is thick, the transfer of foreign matter from the glass interleaving paper is further suppressed.

  As described above, in the glass interleaving paper having the base paper and the coating layer and having a difference in the film thickness of the coating layer within the formation surface on the base paper, the coating layer has a cationic group. It does not have to be. The coat layer may be water-soluble or not water-soluble. When the coat layer has a cationic group and / or is water-soluble, it is preferable because the above-described effects can be further obtained.

  That is, when the coating layer contains the cationic polymer (A) as in the glass interleaving paper according to the embodiment of the present invention, specifically, the glass interleaving paper having the coating layer constituted by the network polymer (A1), In any case of the glass interleaving paper of the coating layer constituted by the chain polymer (A2), it is possible to adopt a configuration in which the film thickness of the coating layer is different within the formation surface on the base paper. In that case, in addition to the effect of using the cationic polymer (A), both the effect of providing a film thickness difference are obtained, which is preferable.

  In addition, the magnitude | size of the film thickness of a coat layer can be formed by adjusting the quantity etc. which apply | coat the composition for coat layer formation. In the case of glass interleaving paper having a film thickness difference in the coating layer, for example, in the case of a coating layer composed of the network polymer (A1), the maximum film thickness of the coating layer is preferably 2.0 nm to 2.5 nm, and the minimum film thickness Is preferably 0.5 nm to 1.0 nm. Similarly, when the coat layer has a different configuration, the relationship between the maximum film thickness and the minimum film thickness is adjusted as appropriate.

  Specifically, the maximum film thickness of the coat layer is preferably 1.2 times or more and 5 times or less, more preferably 1.5 times or more and 4 times or less, and further preferably 2.0 times or more and 3 times the minimum film thickness. The following. Thereby, it can suppress that a glass plate deform | transforms excessively, etc., giving the difference of an appropriate pressing force. In addition, the minimum film thickness and the maximum film thickness are evaluated by values obtained by randomly selecting 20 points on the glass interleaving paper and measuring the film thickness of the coat layer.

  The cationic polymer (A) contained in the coating layer in the glass interleaf of the present invention is preferably a network polymer (A1), and particularly preferably polyethyleneimine. Structurally, the network polymer (A1) tends to have a higher cationic density than the chain polymer (A2), and a coating layer is easily formed. In addition, since it is not necessary to consider the influence of molecular folding or folding, the cationic density can be easily controlled. In particular, polyethyleneimine is suitably used as the cationic polymer (A) because it has the highest cationic density.

Such a glass interleaving paper of an embodiment of the present invention can be manufactured by a method including the following steps (1) to (3), for example.
(1) A step of preparing a liquid coating layer forming composition containing a base paper and a cationic polymer (A).
(2) An application step of applying a coating layer forming composition to a main surface on which a coating layer of a base paper is formed to form a coating film.
(3) A drying step of drying the coating film to obtain a coat layer.

  In the above production method, the liquid coating layer forming composition containing the cationic polymer (A) prepared in the step (1) has a cationic polymer (A) and an optional component as a solute, and a solvent capable of dissolving them. The solution-like composition produced by using is preferable. The composition for forming a coat layer is preferably composed of a cationic polymer (A) and a solvent.

  The solvent is not particularly limited as long as it dissolves the cationic polymer (A) and does not react with these and the base paper. Specific examples of the solvent include one or more water-soluble organic solvents such as water, ethanol, and isopropyl alcohol. Among these, water or a mixture of water-soluble organic solvent such as ethanol and water is preferable.

  The content of the cationic polymer (A) in the composition for forming a coat layer is preferably adjusted to be in the range of 0.01 meq / L to 100 meq / L as the concentration (equivalent) of the cationic group. The concentration (equivalent) of the cationic group in the cationic polymer (A) is more preferably 0.1 meq / L to 10 meq / L in order to prevent the excess while covering the surface of the base paper appropriately. In addition, when 1 mol of a cationic group is contained in 1 L of the composition for forming a coat layer, the concentration is expressed as 1 equivalent and expressed as 1 eq / L.

  About pH of the said composition for coat layer formation, it can adjust suitably in the range of acidic to alkaline, for example, about pH 3-12. The pH of the composition for forming a coat layer is preferably 6 to 12 in that the adhesion amount of the cationic polymer (A) can be increased while further strengthening the electric bonding force by negatively charging the surface of the base paper, 10-11 are more preferable.

  The pH of the coating layer forming composition is adjusted using an acid or an alkali. Ammonia, sulfuric acid, and the like are preferable from the viewpoints that the equipment is not easily corroded and that the residue after washing is small.

  (1) The base paper prepared in the process may be in the form of being used as a glass interleaving paper sandwiched between glass plates, and may be cut into a roll shape before cutting. It may be. The following coating process (2) and drying process (3) are performed according to the form of the prepared base paper. In the case of a base paper cut to the size at the time of use, batch type and continuous type processing is possible, and in the case of a base paper wound in a roll shape, continuous type processing is preferable.

  Next, the coating step (2) is performed. That is, the coating layer forming composition prepared as described above is applied to the surface of the base paper on which the coating layer is formed. Examples of the coating method include coating methods used in known film forming methods such as dip coating, spray coating, spin coating, squeegee coating, and sponge coating. Coating equipment includes knife coaters, blade coaters, rod coaters, air knife coaters, squeeze coaters, reverse roll coaters, transfer roll coaters, gravure coaters, kiss coaters, cast coaters, spray coating, slot orifice fountain coaters, curtain coaters, calendar coaters, etc. Illustrated.

  In the coating operation, the cationic polymer (A) contained in the coating layer forming composition can be obtained by simply bringing the prepared coating layer forming composition into contact with the surface of the base paper. Molecules are arranged so that the part is located on the surface of the base paper, and a coating film containing a solvent is formed. This is because the surface of the base paper tends to be negatively charged, so that a part of the cationic group of the positively charged cationic polymer (A) is electrostatically attracted to the surface of the base paper simply by contact. Because.

  Next, the drying step (3) is performed. The coating film obtained by the coating operation is a layer of the coating layer forming composition containing a solvent. After the coating operation, with the cationic polymer (A) molecules aligned on the surface of the base paper as described above, a uniform coating layer can be easily formed by removing the solvent in the coating film by drying. it can.

As a drying method, a drying method such as heating or air blow, which is usually used for solvent removal, can be applied without any particular limitation. When performing heat drying, it is preferable to heat to 50-80 degreeC, and it is preferable to blow 15-30 degreeC air by an air blow.
Thus, the glass interleaving paper of embodiment of this invention is obtained by the process of said (1)-(3).

  Here, the glass interleaving paper of the present invention includes, for example, the coating step (2) and the drying step (3) in a part of the base paper manufacturing process such as papermaking of a raw material mainly composed of pulp. May be manufactured. In addition, the composition for forming a coat layer used in the step (2) can be the same as the composition for forming a coat layer prepared in the step (1).

  FIG. 3 illustrates an example of a general glass slip sheet manufacturing apparatus 20 showing a conceptual diagram. First, a paper raw material liquid (liquid obtained by diluting pulp with water) is supplied in a sheet form from the head box 21 onto the lower wire 23 installed in the wire part 22. Next, the paper raw material liquid supplied to the lower wire 23 is sandwiched between the lower wire 23 and the upper wire 24 to be spread to a uniform thickness and dehydrated to become wet paper (paper).

  The wet paper formed by the wire part 22 is conveyed to a press part 25 having a press roller pair and the like, where further dewatering and pressing are performed simultaneously. The wet paper that has passed through the press part 25 is conveyed to a dryer part 26 composed of a plurality of rollers, and is dried in an atmosphere of, for example, about 120 ° C. while passing through the dryer part 26. The dried paper is conveyed to the calendar part 27 and subjected to calendar processing by nipping and conveying with a calendar roll, etc., and the front and back surfaces are smoothed. The paper that has been subjected to the calendering process is wound up on a reel 28 as a glass interleaving paper and is rolled 29.

  The general glass interleaving paper thus obtained is prepared and used as a base paper in (1) in the above production method. However, in the case of incorporating the coating step (2) and the drying step (3) into a part of the base paper manufacturing process, for example, in the base paper manufacturing process shown in FIG. The coating step (2) and the drying step (3) can be performed by providing a coater part between the dryer part 26 and the calendar part 27.

  Although not shown in the manufacturing apparatus 20 shown in FIG. 3, such a coater part manufactures paper for the purpose of supplying various coating liquids necessary for the type of paper to be manufactured onto the paper surface. What the device usually has. When manufacturing the glass interleaving paper of the present invention, for example, if a device having a coater part between the dryer part 26 and the calendar part 27 is used in the manufacturing apparatus 20 shown in FIG. 3, without preparing a special apparatus, It can be easily manufactured.

  In such a paper manufacturing apparatus, the width of the obtained paper roll is larger than the size when the glass interleaving paper is used. Therefore, for example, the paper roll is cut into a width according to the product, wound up, and shipped as a roll in which a long glass interleaf having a predetermined length of about 8000 to 10,000 m is wound. And it is cut | disconnected by the cut sheet shape (rectangular shape) of the size according to the glass plate to laminate | stack at the shipping destination, and it interposes between the laminated glass plates.

  As mentioned above, although embodiment of the manufacturing method of the glass interleaving paper and glass interleaving paper of this invention was described, this invention is not limited to these. As long as it does not contradict the spirit of the present invention, the configuration can be changed as necessary.

[Glass plate laminate]
The glass plate laminate of the present invention is a glass plate laminate formed by laminating a plurality of glass plates with the glass interleaving paper of the present invention interposed between the glass plates. The usage example of the glass interleaving paper of this invention was demonstrated above using the glass plate laminated body 10 shown in FIG. Below, the glass plate laminated body of this invention is demonstrated similarly using FIG.

  The glass plate laminate 10 shown in FIG. 2 has a configuration in which five pieces of glass interleaving paper 1 and glass plates 4 are alternately laminated. The glass interleaving paper 1 is the glass interleaving paper of the present invention and is as described above. The glass plate 4 is not particularly limited as long as it has a shape, size, thickness and the like that can be stored and transported by laminating two or more of them, such as a plate shape or a substantially plate shape.

  From the viewpoint that the effect of the glass interleaving paper of the present invention can be exhibited more, the glass plate 4 is a glass plate used in connection with the manufacture of a semiconductor product that is required to keep the surface of the glass plate highly clean, For example, glass plates applied to flat panel displays such as glass substrates for liquid crystal displays and glass substrates for plasma displays, organic EL lighting, and electronic devices such as solar cells are preferable.

  The glass plate 4 used in the present embodiment is appropriately selected in material, shape, etc. according to its application. Examples of the material of the glass plate include ordinary soda lime glass, aluminosilicate glass, borosilicate glass, alkali-free borosilicate glass, and quartz glass. As the glass plate, a glass plate made of glass or tempered glass that absorbs ultraviolet rays or infrared rays can be used.

  The shape of the glass plate 4 may be a flat plate like the glass plate shown in FIG. 2, or the entire surface or a part thereof may have a curvature. The thickness of the glass plate can be appropriately selected depending on the use of the laminated glass plate. Generally, it is preferable that it is 0.3-3.0 mm. The glass plate may be a laminated glass in which a plurality of glass plates are bonded with an intermediate film interposed therebetween.

  When used as a display substrate such as a liquid crystal display or a photomask substrate, it is formed into a predetermined thickness by a known press method, downdraw method, float method, etc., and after slow cooling, processing such as grinding and polishing To make a glass plate of a predetermined size and shape.

  Here, the glass plate may have, for example, a size of about the eighth generation (2200 mm × 2500 mm) developed in recent years. In this case, the thickness of the glass plate is preferably 0.3 to 0.8 mm from the viewpoint of securing strength, and more preferably about 0.4 to 0.7 mm.

Moreover, the glass plate which can be used here may have a functional thin film on the glass plate surface. Specific examples of functional thin films include conductive films (tin-doped indium oxide (ITO), zinc oxide (ZnO), tin oxide (SnO ₂ ), Ag, films having a Cr / Cu / Cr structure, etc.) and heat ray shielding. Film (oxide (eg, zinc oxide, titanium oxide, ITO, etc.) / Ag / layer having an oxide structure, etc.). Here, the zinc oxide may be doped with Al, Ga, hydrogen or the like. Further, the tin oxide may be doped with F or Sb. Further, Ag may be doped with Pd or Au.

  In addition, when a glass plate has a functional thin film on the surface, it is preferable to comprise a glass plate laminated body so that the coating layer of glass interleaving paper may contact the functional thin film of a glass plate.

  The relationship between the size of the main surface of the glass plate 4 and the size of the main surface of the glass interleaving paper 1 is as described above. For example, for the glass plate 4 whose main surface has a rectangular shape and a size of 2200 mm × 2500 mm, the main surface of the glass interleaving paper 1 preferably has a rectangular shape of about 2280 mm × 2580 mm. When the glass plate 4 is rectangular, the length of each side of the glass interleaving paper 1 is preferably 1.02 to 1.05 times the length of the side of the corresponding glass plate 4.

  The number of laminated glass plates and glass slip sheets is usually either the same number of glass plates and glass slip sheets, or the number of glass slip sheets is one more than the number of glass plates. The number of glass plates constituting the glass plate laminate may be two or more. Depending on the size (including thickness) and specific gravity of the glass plate, the number of laminated glass plates can be approximately 300. Usually, it laminates | stacks so that it may become 2000 kg or less as the total mass of a glass plate laminated body.

[Glass plate package]
When transporting or storing the glass plate, the glass plate and the interleaving paper are alternately laminated as described above to form a glass laminate, which is then packed in a packaging container to form a glass plate package. . The glass plate package includes a horizontal type in which glass plates are laminated horizontally and a vertical product type in which glass plates are laminated in an inclined state, and the present invention can be applied to any type. FIG. 4 shows a schematic configuration of an example of a vertically stacked glass plate package according to an embodiment of the present invention. FIG. 5 shows a schematic configuration of an example of a horizontally placed glass plate package according to an embodiment of the present invention.

  A glass plate package 30 shown in FIG. 4 is a glass plate laminate in which a plurality of (n) glass plates 41 to 4n are laminated on a packing container 31 with glass interleaving papers 12 to 1n interposed between the glass plates. 10 is packaged. In addition, the glass interleaving paper 11 is arrange | positioned between the packaging container and the glass plate. The packaging container 31 is a known vertical packaging glass container for packaging glass plates, and is placed on the base 33, the inclined base 32 erected on the upper surface of the base 33, and the upper surface of the base 33. Mounting table 34.

  One surface in the vertical direction of the tilting table 32 (contact surface with the glass plate laminate 10 = back surface) is inclined with respect to the vertical direction (hereinafter also referred to as an inclined surface). The angle of the inclined surface (indicated by α in FIG. 4) may be an angle at which the laminated glass plate laminate 10 can be stably stacked, stored and transported, and is generally 85 ° with respect to the horizontal direction. For example, it is 85 ° to 70 °.

  Further, the upper surface of the mounting table 34 is inclined so as to descend toward the inclined table 32 with respect to the horizontal direction. In the illustrated example, as an example, the upper surface of the mounting table 34 is configured to be 90 ° with respect to the inclined surface of the inclined table 32.

  In the packing container 31, the glass plate 41 is placed on the upper surface of the mounting table 34 and stacked in a state of leaning on the inclined surface of the inclined table 32. The n (n is an integer of 2 or more) glass plates are glass plates 41, 42,. Moreover, the glass interleaving paper 12-1n of the said invention is interposed between the glass plates 41-4n. In addition, in FIG. 4, the glass interleaving paper 11 of this invention is similarly interposed between the laminated | stacked glass plate 41 and the inclination stand 32. FIG. The glass interleaving paper which the glass laminated body 10 has is the same number of n sheets as the glass plate, and is the glass interleaving papers 11, 12,.

  For example, the glass plate laminate 10 shown in FIG. 4 has a glass plate 41, 42,..., 4n whose lower principal surface is an element formation surface and whose upper principal surface is an element non-formation surface. The interleaving papers 11, 12,..., 1n are examples in which glass interleaving paper having a coating layer formed on one main surface of the base paper is disposed with the coating layer facing upward. Here, the lower side refers to the inclined surface side of the tilt table, and the upper side refers to the opposite side.

  The glass interleaving papers 11 to 1n are larger in size than the glass plates 41 to 4n, and between the glass plates 41 to 4n or between the glass plates 41 and the tilt table 32 so as to cover the entire surface of the glass plates 41 to 4n. Intervening in between. Here, the surface of the frontmost glass plate 4n may be similarly covered with the glass interleaving paper of the present invention.

  The glass plate package 50 shown in FIG. 5 is a glass plate laminate in which a plurality (n) of glass plates 41 to 4n are laminated on a packing container 51 with glass interleaving papers 12 to 1n interposed between the glass plates. 10 is packaged. In addition, the glass interleaving paper 11 is arrange | positioned between the packaging container and the glass plate. The packaging container 51 is a well-known packaging container for horizontally placed glass plates, and includes a base 53, a mounting base 54 placed on the top surface of the base 53, and a corner of the top surface of the base 53, for example, If the upper surface of the base 53 is rectangular, it has the support | pillar 52 for laminating | stacking the packing container 51 in at least four corners.

  The glass plate laminate 10 in FIG. 5 is the same as the glass laminate 10 shown in FIG. 2 except that the number of glass plates and glass slip sheets is n. The n glass plates (n is an integer of 2 or more) are glass plates 41, 42,..., 4n in order from the mounting table 54 side. Moreover, the glass interleaving paper which the glass laminated body 10 has is the same number of n sheets as a glass plate, and is the glass interleaving paper 11, 12, ..., 1n in order from the mounting base 54 side.

Here, in any case of the vertically stacked glass plate package 30 shown in FIG. 4 and the horizontally placed glass plate package 50 shown in FIG. 5, the lowermost glass plate 41 of the glass plate laminate 10 is used. The most surface pressure is applied. If the glass interleaving paper of the present invention is used, the surface pressure applied to the lower principal surface of the lowermost glass plate is 10 g / cm ² or more in the case of a glass plate laminate and further a glass plate package. However, there is little transfer of foreign matter from the glass interleaving paper interposed between the glass plates, and storage and transportation are possible while maintaining the cleanliness of the glass plates before lamination. In the glass interleaving paper of the present invention, it is preferable that the same effect as described above is obtained even when the surface pressure is 20 g / cm ² or more.

If the glass interleaving paper of the present invention is used, the surface pressure applied to the lower main surface of the lowermost glass plate is approximately 50 g / cm ² , and the glass plate after being stacked, stored and transported Can be ensured to the extent that there is no problem in use. In general, in a horizontally mounted glass plate package, the surface pressure applied to the lowermost glass plate is larger than that of a vertically stacked glass plate package. Therefore, the glass plate package of the present invention can exhibit a particularly remarkable effect in a horizontally placed glass plate package that is laminated so that the principal surfaces of a plurality of glass plates are horizontal.

  Further, in the glass plate laminate and the glass plate package of the present invention using the glass interleaving paper of the present invention, when a part of the coat layer is transferred to the surface of the glass plate after being stored and transported Even so, the cationic polymer (A) constituting the coating layer is water-soluble, so the cationic polymer (A) adhering to the surface can be easily removed by washing the glass plate with water or an alkaline detergent. can do. Therefore, according to the present invention, the occurrence rate of malfunction of a liquid crystal display or the like manufactured using a glass plate can be significantly reduced as compared with the conventional case. Furthermore, even if it is a case of a large sized glass plate, it has the effect.

Hereinafter, the present invention will be described in more detail based on examples and comparative examples.
<Preparation of Composition 1 for Forming Coat Layer>
Polyethylenimine (Epomin SP-003 (average molecular weight: about 300, cationic group density: 23.2 [eq / MW1000]) manufactured by Nippon Shokubai Co., Ltd., which is a network polymer (A1) as the cationic polymer (A), hereinafter referred to as “PEI-300 Is dissolved in pure water so as to have a concentration of 1 meq / L to prepare a coating layer forming composition 1. The pH of this solution is about 10.5.

<Preparation of Composition 2 for Forming Coat Layer>
Polyethyleneimine (PEI; Nippon Shokubai Co., Ltd. Epomin SP-006 (average molecular weight of about 600), cationic group density; 23.2 [eq / MW1000], hereinafter referred to as “PEI” as the cationic polymer (A) -600 ") was dissolved in pure water so as to have a concentration of 1 meq / L to prepare a coating layer forming composition 2. The pH of this solution is about 10.5.

(Example 1)
As a base paper, an FPD (flat panel display) slip sheet (special type Tokai Paper Co., Ltd., trade name: Kirari, thickness: 80 μm) cut to 400 mm × 500 mm, which is the size of a test glass slip sheet. Four sheets were prepared. On one main surface of the base paper, 30 mL of the coating layer forming composition 1 obtained above was applied by spraying to one main surface. Thereafter, the surface of the coating film of the coating layer forming composition 1 is dried to some extent by applying warm air with a drier, then naturally dried to remove moisture, and a glass having the same structure as shown in FIG. Four sheets of interleaving paper A were obtained.

(Example 2)
Four glass interleaving papers B were obtained in the same manner as in Example 1, except that the coating layer forming composition 2 was used instead of the coating layer forming composition 1.

(Example 3)
In the same manner as in Example 1, except that pure water was used instead of the composition 1 for forming a coat layer, four sheets of glass interleaving paper C washed with pure water and having no coat layer were obtained.

(Evaluation)
After laminating the glass plate, the glass interleaving papers A to C obtained above and the interleaving paper for FPD as the base paper, which has not been processed by the following method, the glass interleaving paper on the surface of the glass plate The transfer state of the foreign matter (particles) from was measured and evaluated.

(Production of glass plate laminate)
Eighteen glass plates made of alkali-free borosilicate glass having a surface of 470 mm × 370 mm × 0.7 mm in thickness were prepared. A test glass plate laminate in which 18 sheets of glass plates and 16 sheets of glass interleaving paper were alternately laminated was obtained. The glass plate laminate for testing had substantially the same configuration as that in FIG. 5 except for the packing container (however, the glass interleaving paper 11 was not used).

  That is, when the 18 glass plates are laminated in order of the glass plates 41, 42,..., 418 in order from the bottom, 16 sheets of the glass interleaving paper are arranged in the order of the glass interleaving papers 12, 13,. Laminated. The glass plates 41 to 418 are all the same glass plate, and the types of the glass slip sheets 12 to 117 are shown in Table 1. In Table 1, the glass interleaving paper A, the glass interleaving paper B, and the glass interleaving paper C are indicated by “A”, “B”, and “C”, respectively. An FPD slip sheet as a base paper is indicated by “Ref”. In addition, the glass interleaving paper 11 shown in FIG. 5 was not used. Each glass interleaving paper was laminated so that the coat layer or the pure water cleaning surface was on the upper side.

(Particle measurement)
On the upper surface of the glass plate laminate obtained above, an aluminum plate having a weight of 400 mm × 500 mm and a thickness of 3.0 mm is weighted on the entire upper surface so that the weight is 40 kg (glass interleaving papers A to C and FPD). 24 in a constant temperature and humidity chamber (temperature 80 ° C., humidity 40%) in a state in which the surface pressure of the glass plate in contact with each of the four sheets of paper is weighted so that the average of the four sheets is 20.6 g / cm ^2. After storage for a period of time, the glass slip sheet was removed from the glass plate laminate, and 18 glass plates 41 to 418 were taken out. Of the 18 glass plates taken out, the number of particles on the lower main surface of 16 glass plates 42 to 417 was measured. In addition, the particle measurement was implemented using Toray Engineering Co., Ltd. FPD foreign material inspection apparatus HS830e.

  Here, in the evaluation, particle measurement was performed on the lower principal surface of the glass plate located on the upper side of the glass slip sheet, and the result of the glass slip sheet was obtained. For example, the glass interleaving paper 12 with a stacking position of 12 is made of the glass interleaving paper A and is sandwiched between the glass plate 41 and the glass plate 42, but the coat layer is on the main surface on the upper side, that is, the lower side of the glass plate 42. The above evaluation method was adopted because of being laminated.

The average value of the number of particles transferred to the glass plate from each of the four glass interleaving papers A to C and FPD interleaving paper thus obtained was calculated. The results are shown in Table 2 (in the “after lamination” column) as the number and total number of particles (S, M, L) for each particle size. The particle size is such that S is a particle diameter of less than 1 μm, M is a particle diameter of 1 μm or more and less than 3 μm, and L is a particle diameter of 3 μm or more and less than 5 μm. The number of particles is the number of particles per unit area on the glass plate surface after lamination (number / 0.17 m ² ) to the number of particles per unit area on the glass plate surface before lamination (number / 0.17 m ² ). It was obtained by subtracting.

  Further, after preparing a glass laminate in the same manner as described above and storing it in a constant temperature and humidity chamber, the glass plate taken out was scrubbed with 1% alkaline detergent (using a rotating PVA brush) and then the same as above. The number of particles was measured. The results for the glass interleaving papers A to C are shown in the “after washing” column of Table 2 as an average value of four sheets.

From Table 2, the glass interleaving papers A and B on which the coating layer was formed were able to reduce the number of particles from Ref both after lamination and after washing.
On the other hand, the glass interleaving paper C which did not have a coating layer and was subjected only to pure water cleaning had a tendency that the number of particles was higher than Ref after cleaning although the number of particles was lower than Ref after lamination. When only pure water was applied to the base paper, it was considered that the cleanability deteriorated, and it was found that the final number of particles could not be reduced with pure water alone.

DESCRIPTION OF SYMBOLS 1 ... Glass interleaving paper, 2 ... Coat layer, 3 ... Base paper, 4 ... Glass plate, 10 ... Glass plate laminated body, 20 ... Glass interleaving paper manufacturing apparatus, 21 ... Head box, 22 ... Wire part, 23 ... Lower wire 24 ... Upper wire, 25 ... Press part, 26 ... Dryer part, 27 ... Calendar part, 28 ... Reel, 29 ... Roll 30, 50 ... Glass plate package, 31, 51 ... Packing container, 32 ... Inclined stand, 33 , 53 ... Base, 34, 54 ... Mounting table, 52 ... Post

Claims (10)

When laminating a plurality of glass plates, glass interleaving paper interposed between the glass plates,
A glass interleaving paper comprising a base paper and a coating layer comprising a water-soluble cationic polymer having a cationic group and an average molecular weight of 2 to 1,000,000 formed on at least one main surface of the base paper.   The glass interleaving paper according to claim 1, wherein the cationic polymer has a cationic group density of 3 to 40 [eq / MW1000] per 1000 molecular weight.   The glass interleaving paper according to claim 1 or 2, wherein the cationic group is an amino group or a quaternary ammonium group.   The glass interleaving paper according to any one of claims 1 to 3, wherein the cationic polymer is a network polymer having an average molecular weight of 200 to 2,000.   The glass interleaving paper according to any one of claims 1 to 4, wherein the cationic polymer is polyethyleneimine.   The glass interleaving paper according to any one of claims 1 to 3, wherein the cationic polymer is a chain polymer having the cationic group in the main chain and having an average molecular weight of 1,000 to 1,000,000.   The glass plate laminated body formed by laminating | stacking several glass plates so that the glass interleaving paper of any one of Claims 1-6 may interpose between the said glass plates.   The glass plate package which has a packaging container and the glass plate laminated body of Claim 7 accommodated in the said container. The glass plate package according to claim 8, wherein a surface pressure applied to a lower main surface of the lowermost glass plate of the glass plate laminate is 10 g / cm ² or more.   The said glass plate laminated body is a glass plate package of Claim 8 or 9 laminated | stacked so that the main surface of the said several glass plate might become horizontal.

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