WO2007007530A1

WO2007007530A1 - Interleaving paper for glass

Info

Publication number: WO2007007530A1
Application number: PCT/JP2006/312655
Authority: WO
Inventors: Satoshi Takeda; Atsuyoshi Takenaka; Kazuhiro Aoki; Ken Ebihara
Original assignee: Asahi Glass Company, Limited
Priority date: 2005-07-13
Filing date: 2006-06-23
Publication date: 2007-01-18
Also published as: TW200718828A; JPWO2007007530A1

Abstract

A treatment for producing an interleaving paper for glass which can protect glass sheets from flawing more effectively and makes it possible, when the components of the paper stick to the surfaces of glass sheets, to removal them easily by water washing, the wastewater of which washing can be easily treated by virtue of its being free from environmental loading substances, and which can exert its effects even when applied to large-sized glass sheets; an interleaving paper for glass, finished with the treatment; glass laminates with the interleaving paper between glass sheets; a method for packaging glass sheets by placing the interleaving paper between the glass sheets; and a method for protecting glass sheets from flawing. Specifically, a treatment for the interleaving paper to be placed between glass sheets, which contains a water-soluble organic acid salt; and an interleaving paper for glass, obtained by forming a layer containing the treatment on paper.

Description

Specification

Glass slip paper

Technical field

[0001] The present invention relates to a processing agent for processing paper sandwiched between glass plates, a glass interleaving paper obtained by processing using the same, a glass laminate interposing it between glass plates, and The present invention relates to a method for packing a glass plate and a method for preventing the generation of scratches on the glass plate, which are interposed between glass plates.

Background art

[0002] Various glass products such as plate glass, bottle glass, glass for display, glass for optical parts, glass for electronic parts, and the like are easily contaminated on the surface during production, storage and transportation, and are prone to product defects. In particular, when used as a glass substrate that incorporates an electric circuit on its surface, such as a non-alkali glass plate for liquid crystal displays, disconnection and patterning defects may occur even if there is a strong scratch on the surface. Therefore, extremely high surface characteristics are required.

[0003] Scratches on the surface of such a glass plate may occur, for example, when the glass plates are stacked and transported, causing a shift between adjacent glass plates.

In addition, contamination of the glass plate surface may occur when organic substances in the storage and transport atmosphere are adsorbed on the glass plate surface. This organic matter (contaminant) is difficult to remove from the glass plate surface only by washing with water. For example, it is necessary to wash with an acid or alkali. However, in this case, the working environment during cleaning deteriorates, and cleaning and waste liquid treatment costs also increase. Furthermore, even if such cleaning is performed, it is difficult to completely remove organic substances from the surface of the glass plate.

[0004] As a method for preventing such scratches during storage and transportation, there is a method of interposing a so-called interleaf paper in which paper is sandwiched between laminated glass plates and the surfaces of adjacent glass plates are separated. Are known.

However, in such a method of sandwiching paper, since the paper is in direct contact with the glass plate surface, the problem is that the oil component of the paper is transferred to the glass plate surface and contaminates the glass plate surface. The

[0005] Therefore, in order to avoid this, currently, a method such as using paper with a low content of the slag component is used.

However, it is practically extremely difficult to precisely control the transfer amount of the oil component of the paper strength, and such paper is a factor that increases the price and costs compared to plain paper.

[0006] Therefore, a glass slip sheet as exemplified below has been proposed.

For example, Patent Document 1 describes a glass interleaving paper containing 0.1% by weight or more of sodium tripolyphosphate. Further, it is described that by using this slip sheet, it is possible to obtain effects such as water repellency on the glass surface and avoiding a paper attraction without strictly controlling the property of the slip sheet as in the past. And

[0007] Further, Patent Document 2 describes a slip sheet for glass that is sandwiched between glass plates and contains 50 mgZm ² or more of sodium tetraborate. The traces of the paper skin appearing on the glass surface due to adhesion of water vapor and the like are presumed to be due to transfer unevenness such as the fat content of the interleaf paper or the fatty acid sodium of the hydrolyzate. This paper is described as having a wrinkle effect if the water-repellent source is easily removed by washing.

Patent Document 1: Japanese Patent Laid-Open No. 6-316432

Patent Document 2: Japanese Patent Laid-Open No. 7-101483

Disclosure of the invention

Problems to be solved by the invention

[0008] However, even when conventional slip sheets as described in Patent Documents 1 and 2 are applied to store and transport the glass plate, slight scratches may occur on the surface of the glass plate.

In addition, components such as sodium tripolyphosphate and sodium tetraborate described in Patent Documents 1 and 2 described above adhere to the surface of the glass plate and become contaminants, and are difficult to remove by subsequent water washing. There was a case. In addition, the wastewater generated at the time of washing with water contains environmentally hazardous substances such as phosphoric acid and boric acid, which requires time and effort for wastewater treatment and increases costs. In addition, wastewater is usually circulated and used again as washing water, When a glass plate is washed with washing water contaminated with sodium, it is difficult to completely eliminate sodium, and there is a problem that sodium contamination remains on the glass plate.

[0009] When such a glass plate with a slight amount of contaminants attached thereto is used as a glass substrate in which an electric circuit or the like is incorporated on the surface, such as a liquid crystal display, the electric circuit or the like is disconnected or patterned. Defects may occur and malfunctions may occur in manufactured liquid crystal displays.

Furthermore, the paper used for the slip paper usually contains carbon such as a resin component, and when the carbon is transferred to a glass plate, it is difficult to remove it by simple cleaning. May malfunction.

[0010] Furthermore, in recent years, the size of glass plates has increased, and the surface of the glass plates has been scratched due to reasons such as being forced to be stacked during storage and transportation. It is in a state where it tends to adhere firmly.

[0011] Therefore, the present invention can be easily washed away with water even if a component of the slip sheet having a higher ability to prevent scratches is attached to the surface of the glass plate, and does not contain environmentally hazardous substances. Therefore, the treatment agent for treating the paper sandwiched between the glass plates, which can easily exert the effect even when applied to a large glass plate, is easy for waste water treatment at the time of washing with water, Glass interleaving paper obtained by processing using the same, a glass laminate in which it is interposed between glass plates, and a glass plate packing method and a method for preventing generation of glass plate scratches in which it is interposed between glass plates Is to provide.

Means for solving the problem

[0012] The present inventor examined the causes such as the occurrence of scratches as described above and the difficulty of removing the deposits on the surface of the glass plate with water.

The cause lies in the type of substance applied to the paper sandwiched between the glass plates, and it has been found that such problems can be solved if a specific material is used.

[0013] The present invention is based on the above findings, and has the following (1) to (22).

(1) A treating agent for treating paper sandwiched between glass plates, comprising a water-soluble organic acid salt. (2) The treating agent does not contain an alkali component! The treating agent according to (1) above.

(3) The treating agent according to (1) or (2), wherein the water-soluble organic acid salt is a carboxylic acid salt of a saccharide.

(4) Carboxylate power of the saccharide The treating agent according to the above (3), which is a carboxylic acid salt of a polysaccharide.

(5) The treating agent according to (4), wherein the polysaccharide is a carboxylate of alginate.

(6) The treating agent according to any one of the above (1) to (5), wherein the treating agent has a viscosity of 350 to 500 mPa's at 20 ° C.

(7) The treatment agent according to any one of (1) to (6), wherein the content of the water-soluble organic acid salt is 0.01 to 90% by mass in the treatment agent.

(8) The treatment agent contains a water-soluble organic acid salt and a water-soluble film-forming component, and the ratio of the water-soluble organic acid salt is the total amount of the water-soluble organic acid salt and the water-soluble film-forming component. The treatment agent according to any one of (1) to (7), which is 50% by mass or more based on

(9) A slip sheet for glass formed by applying the treatment agent according to any one of (1) to (8) above on paper.

(10) Glass interleaving paper having a treatment agent-containing film containing a water-soluble organic acid salt.

(11) The glass interleaf according to (10), wherein the treating agent-containing film does not contain an alkali component.

(12) The interleaving paper for glass according to the above (10) or (11), wherein the water-soluble organic acid salt is a carboxylic acid salt of a saccharide.

(13) Carboxylate power of the saccharide The glass interleaving paper according to the above (12), which is a carboxylic acid salt of a polysaccharide.

(14) The glass interleaving paper as described in (13) above, wherein the polysaccharide is a carboxylate of alginate.

(15) The treating agent-containing film contains a water-soluble organic acid salt and a water-soluble film-forming component, and the ratio of the water-soluble organic acid salt is a ratio between the water-soluble organic acid salt and the water-soluble film-forming component. The interleaving paper for glass according to any one of the above (10) to (14), which is 50% by mass or more based on the total amount. (16) The glass interleaving paper according to any one of (9) to (15), wherein the glass interleaving paper is for alkali-free glass.

(17) The glass interleaving paper according to any one of (9) to (16), wherein the glass interleaving paper is for glass having a size of 1500 mm × 1800 mm or more.

(18) A glass laminate in which at least two glass plates are laminated,

A glass laminate in which the interleaf paper for glass according to any one of (9) to (17) is interposed between at least some of the glass plates.

(19) The glass laminate The glass laminate according to (18), which is an alkali-free glass plate.

(20) A glass plate packing method in which at least two or more glass plates are stacked and packed, and between at least some of the glass plates, the glass according to any one of (9) to (17) above Glass plate packing method with interleaving paper.

(21) The glass plate packing method according to (20), wherein at least one of the glass plates has a functional thin film on the surface of the glass plate.

(22) A method for preventing the generation of scratches on a glass plate, wherein the glass interleaving paper according to any one of (9) to (17) above is interposed between a plurality of glass plates to prevent the generation of scratches on the glass plate. .

The invention's effect

[0014] According to the present invention as described above, the components of the paper sandwiched between the glass plates, which have a higher ability to prevent scratches, do not adhere to the glass plate surface, and the cleanliness of the glass is maintained. In addition, even when the film adheres to the glass surface, it can be easily removed by washing with water, the waste water treatment at the time of washing with water is simple, and even when applied to a large glass plate, it has the effect. .

Brief Description of Drawings

[0015] FIG. 1 is a side sectional view showing a glass interleaving paper according to one embodiment of the present invention.

Explanation of symbols

[0016] 1 ... Glass slip

10 · "Paper

20 ... Processing agent-containing membrane

BEST MODE FOR CARRYING OUT THE INVENTION [0017] The present invention is a processing agent for processing paper sandwiched between glass plates, and includes a water-soluble organic acid salt. Here, “treating” means forming a film on the paper or impregnating the paper itself with a treating agent.

That is, the present invention is a processing agent used for coating on the surface of paper sandwiched between glass plates, and includes a water-soluble organic acid salt in the solution. Hereinafter, such a treating agent is also referred to as “the treating agent of the present invention”.

The paper treated with the treatment agent of the present invention is used as a slip sheet for protecting the glass plate surface or preventing contact between the glass plates.

Here, the paper sandwiched between the glass plates does not necessarily have to be sandwiched between a plurality of glass plates, and one side of the paper covers at least a part of the surface of the glass plate, It only needs to be protected. The same applies to the following glass slip sheet of the present invention, the glass laminate of the present invention, the packaging method of the present invention, and the method for preventing flaws of the present invention.

[0019] The present invention is also a glass interleaving paper having a treating agent-containing film containing a water-soluble organic acid salt, which can be obtained by treating with the treating agent of the present invention. Hereinafter, the “treatment agent-containing film containing a water-soluble organic acid salt” is also referred to as “the treatment agent-containing film of the present invention”. In the following, such glass slip sheet is also referred to as “glass slip sheet of the present invention”.

[0020] Further, the present invention is a glass laminate in which at least two or more glass plates are laminated, wherein the glass laminate of the present invention is interposed between at least some of the glass plates. Is the body. Hereinafter, such a glass laminate is also referred to as a “glass laminate of the present invention”.

[0021] Further, the present invention is a glass plate packing method in which at least two or more glass plates are laminated and packed, and the glass interleaving paper of the present invention is interposed between at least some of the glass plates. It is a glass plate packing method to wear. Hereinafter, such a glass plate packing method is also referred to as a “packing method of the present invention”.

[0022] Furthermore, the present invention is a method for preventing the occurrence of scratches on a glass plate, for example, by interposing the interleaving paper for glass of the present invention between a plurality of glass plates to prevent the occurrence of scratches on the glass plate. Hereinafter, such a method for preventing scratches on glass plates from being stained is also referred to as the “scratch prevention method of the present invention”.

[0023] First, the treatment agent of the present invention will be described.

The treatment agent of the present invention contains a water-soluble organic acid salt in the solution. Here, "organic acid" means organic Among compounds, the compound is acidic and is an organic compound having a carboxyl group, a sulfonic acid group, and a phosphoric acid group. “Organic acid salt” refers to an organic compound having a structure in which a part or all of hydrogen atoms such as carboxyl group and sulfonic acid group are substituted with a strong cation (ammonium ion, metal ion), etc. It is.

[0024] Further, "water-soluble" in the water-soluble organic acid salt means that the glass plate is laminated with the glass interleaf of the present invention, stored, transported, etc., and then washed with water. It means that the water-soluble organic acid salt adhering to the surface of the glass plate is so soluble that it can be washed away with water.

Here, “can be removed by washing” means that “the contact angle between water and the glass plate surface is 15 degrees or less” by “rinsing treatment” and X-ray photoelectron spectroscopy. When the surface analysis by (XPS) is performed, it means that the residual ratio of the water-soluble organic acid salt is so low that the component of the glass interleaf of the present invention is below the lower limit of detection (less than 0.3 latomic%). Flat panel displays such as liquid crystal, PDP, organic EL, inorganic EL, field emission display, and fluorescent display tube are required to have very high cleanliness in order to ensure their performance. In this respect, it is effective to use a slip sheet coated with a treatment agent that can be removed by washing with water.

[0025] Here, "washing treatment" refers to a water-soluble organic acid salt adhering to a glass plate in a normal manner (for example, water at a temperature of 20 ° C for 30 minutes at 3 liters Z minutes for 30 minutes). It means washing with water using a shower with water pressure on a glass plate. In the following, this type of water washing treatment is also referred to as “water washing treatment A”.

[0026] Further, here, "the contact angle between water and the glass plate surface is 15 degrees or less" means that the contact angle measured by applying the dropping method in JIS-R3257 (199 9) is 15 degrees or less. Say. Such a contact angle measurement method is hereinafter also referred to as “contact angle measurement method A”. In the present invention, the contact angle is simply a contact angle measured by this method. The contact angle is preferably 10 degrees or less, particularly preferably 5 degrees or less. In particular, unlike a simple glass sheet used for a window glass or the like, a liquid crystal display or the like requires such very high cleanliness.

[0027] As described above, since the treatment agent of the present invention is water-soluble, a glass plate that has been stored, transported, etc. by applying an interleaving paper coated with this is used after removing the interleaving paper. The treatment agent Even if it remains on the surface of the steel plate, it can be easily removed by simple water washing.

[0028] Such a treatment agent of the present invention preferably contains no alkali component. Here, “not containing an alkali component” means substantially not containing an alkali component, and means that the alkali component content power S in the treatment agent of the present invention is lOOOOppm or less in the solution. .

Here, the alkali component content of the treating agent of the present invention is preferably 5000 ppm or less, more preferably lOOOppm or less.

[0029] The term "alkali" as used herein means an alkali metal element (lithium, sodium, potassium, rubidium, cesium, francium). The same applies to the “non-alkali glass” described later.

[0030] It should be noted that this alkali component content is determined by performing wet decomposition using concentrated nitric acid and concentrated sulfuric acid after drying the treatment agent of the present invention, and diluting the obtained liquid as appropriate for ICP emission analysis. This is the measured value.

[0031] A liquid crystal display or the like produced using a glass plate that has been stored, transported, etc. by applying a slip sheet that does not contain such an alkali component and that has been coated with the treatment agent of the present invention has been disclosed in the related art. The occurrence rate of malfunctions is much lower than when using slip sheets. The reason for this is presumed that when the treatment agent does not contain an alkaline component, the alkali component is not transferred to the glass, and as a result, the glass substrate can be kept clean. For the above reasons, the water-soluble organic acid salt is also preferably alkali-free, that is, does not contain an alkali component.

[0032] In the treatment agent of the present invention, the water-soluble organic acid salt as described above is preferably a sugar carboxylate, acetate, palmitate, phthalate or the like. Particularly preferred is a saccharide carboxylate. The reason is that when the treatment agent of the present invention is applied to paper, a uniform film can be formed more easily, and since it is a salt, the glass plate has a higher dissolution rate in water than acid. It is also a force that can be easily removed by washing with water. The molecular weight of the water-soluble organic acid salt is preferably large. The large molecular weight is preferable in that the resin can be uniformly coated with the resin and the desired effect can be exhibited. Specifically, when the concentration of the aqueous solution of the treatment agent is 1% by mass, the viscosity is 20 ° C., preferably 350 to 5 OO mPa · s, particularly preferably 400 to 450 mPa · s. It is preferable that is there.

Here, saccharides are the following monosaccharides, oligosaccharides, and polysaccharides. The treatment agent of the present invention adhering to the surface of the glass plate containing these saccharides can be easily removed by washing with water. That is, when the above-described washing treatment A is performed, the measurement result by the contact angle measurement method A is 15 degrees or less, and when the surface analysis is performed by XPS, the constituent components of the treatment agent of the present invention are below the detection lower limit.

[0034] Examples of the monosaccharide include glucose, fructose, galactose and the like. Examples of the “monosaccharide carboxylic acid” include uronic acid (eg, galataturonic acid, glucuronic acid, iduronic acid) and the like. In addition, “monosaccharide carboxylate” means that, for example, a part or all of the carboxyl group of uronic acid is substituted with a cation (ammonium ion, metal ion (Ca, Mg, etc.), etc.) Things.

[0035] Examples of oligosaccharides include sucrose, maltose, and lactose.

[0036] The carboxylate of the saccharide is preferably a polysaccharide carboxylate. The reason is that when the treatment agent of the present invention is applied to paper, a uniform film can be formed more easily, and since it is a salt, the glass plate has a higher dissolution rate in water than acid. This is because it can be easily removed by washing with water.

Here, the polysaccharide may be a homopolysaccharide or a heteropolysaccharide. Specific examples of the homopolysaccharide include starch, glycogen, cellulose, inulin, and mannan. Examples of the heteropolysaccharide include dalcomannan and agar.

Examples of the “polysaccharide carboxylic acid” include alginic acid, hyaluronic acid, chondroitin, and henolin.

Sarakuko, “polysaccharide carboxylate” means, for example, that some or all of the carboxyl groups such as alginic acid, hyaluronic acid, chondroitin, heparin are cations (ammonium ions, metal ions, etc.). ) And the like.

[0038] Further, the polysaccharide carboxylate is preferably ammonium alginate. When applying the treatment agent of the present invention to paper, a uniform film can be formed more easily, and because it is a salt, it adheres to a glass plate that has a higher dissolution rate in water than acid. This is because it can be easily removed by washing with water. In addition, because the material cost is low and biodegradability is high, it is an environmentally friendly material and suitable for industrial applications.

The reason why alginate can be easily removed by washing with water is that (1) the amount of alcoholic OH in the molecule is small and the interaction with the glass surface is small, and it is difficult for adsorption to remain on the surface. (3) Since crystalline salts crystallize, grain boundaries are created during the crystallization, creating microscopic gaps, so the surface is completely at the molecular level. However, it is presumed that alginate is an ionic polymer and is non-crystalline, so there are no grain boundaries, and it can be coated uniformly on the surface.

[0039] Here, the viscosity of the treating agent of the present invention is preferably 350 to 500 mPa's at 20 ° C. If the viscosity is within this range, it is possible to wash and remove the force on the glass plate more easily and completely when adhering to the glass plate, and it is not dissolved by condensation that occurs during storage and transportation. The slip sheet for glass of the present invention can be easily produced. Viscosity of the treatment agent is ί or preferably ί or 350 ~ 500mPa's, 400 ~ 4500111 & '5' is particularly preferred 1kg. In addition, it is preferable that the treatment agent of the present invention is not gelled in terms of excellent cleanability of the glass plate after washing with water.

[0040] The treatment agent of the present invention may contain two or more of the water-soluble organic acid salts as described above. Even that case is within the scope of the present invention.

[0041] Such a treatment agent of the present invention comprises a water-soluble organic acid salt as described above in a solution (a solvent, a water-soluble organic acid salt, a water-soluble film constituent described later, and other components). (Total) in any ratio that produces the effect! The content of the water-soluble organic acid salt in the treatment agent of the present invention is preferably 0.01 to 90% by mass, and more preferably 0.05 to 5% by mass. Most preferably, it is 1-3 mass%. With such a concentration, when it adheres to the glass plate, it is possible to more easily and completely remove the force on the glass plate with water, and the interleaf strength also has a barrier on the movement of the alkali component to the glass plate surface. This is preferable from the viewpoint of cost and waste liquid treatment.

The concentration of 0.1 to 3% by mass appears to be very thin. However, the present invention When used as a treatment agent for such slip paper, it is preferable that the formed film is not transferred to the paper. Then, the present inventors have found that it is more important to apply at a lower concentration than in the case of forming a normal film.

[0042] Here, the solvent that dissolves the water-soluble organic acid salt as described above is preferably distilled water or ion-exchanged water that is substantially free of an alkali component. More preferably, it is water that does not substantially contain an alkali component. In the case of water, the waste liquid generated when the paper sandwiched between the glass plates is subjected to a treatment such as coating is simple, and this is an industrially advantageous force.

[0043] The treatment agent of the present invention contains water or the like as described above and contains the above-mentioned water-soluble organic acid salt. However, the treatment agent of the present invention is water-soluble as long as the effect thereof is not impaired. It may contain a functional film constituent component and other components.

[0044] Here, the water-soluble film constituent component is a substance other than the above-mentioned water-soluble organic acid salt, and is a component that forms a film and has a certain degree of water solubility when applied to paper, etc. Specifically, at least one selected from a water-soluble polymer, a water-soluble organic salt, and a water-soluble inorganic salt is preferable. Even if this water-soluble film constituent is contained in the treatment agent of the present invention, the treatment agent of the present invention is preferably alkali-free. When the water-soluble organic acid salt and the water-soluble film are mixed in the treatment agent of the present invention! /, The ratio of the water-soluble organic acid salt is determined by the ratio of the water-soluble organic acid salt and the water-soluble film. It is preferably 50% by mass or more, particularly preferably 80% by mass or more, and more preferably 100% by mass with respect to the total amount with the constituent components. The ratio of the water-soluble organic acid salt is the same in the treatment agent-containing film of the present invention. In other words, the content of the water-soluble film constituent is less than 50% by mass, particularly less than 20% by mass, and it is preferable that it is not included! /.

Examples of the water-soluble inorganic salts include carbonates, nitrates, sulfates, phosphates, silicates, borates and the like. Specifically, ammonium carbonates, ammonium nitrates, ammonium sulfates. Salt, ammonium phosphate, ammonium silicate, ammonium borate and the like.

[0045] As other components, for example, a surfactant, a dispersant, an antifoaming agent, an antistatic agent and the like can be contained. Among these, the one containing substantially no alkali component Is preferred.

Examples of the surfactant that does not substantially contain an alkali component include polyoxyethylene oleyl ether, polyoxyethylene lauryl ether, and polyoxyethylene naphthyl ether.

If such a surfactant is contained in the treatment agent of the present invention, it is preferable that the treatment agent of the present invention can be more uniformly contained in the paper when the paper is treated with the treatment agent of the present invention.

[0046] The treatment agent of the present invention preferably contains 0.001 to 1% by mass in the solution of such other components as long as the effects of the present invention are not impaired. More preferably, it is 0.005 to 0.5% by mass, and most preferably 0.01 to 0.1% by mass.

[0047] By using such a treatment agent of the present invention, paper described later can be processed to produce the glass interleaving paper of the present invention. The glass interleaving paper of the present invention can be manufactured by coating the paper with the treatment agent of the present invention. Further, the treatment agent-containing film of the present invention is formed by treating the surface of paper with the treatment agent of the present invention containing the water-soluble organic acid salt, but in addition to those having a film on paper, Also included are those containing the water-soluble organic acid salt inside (for example, those impregnated).

Next, the manufacturing method of this glass interleaving paper of this invention is illustrated.

[0048] When the paper described below is processed using the processing agent of the present invention, the processing method can be any method without particular limitation. For example, an internal addition method in which a processing agent of the present invention is added to a pipe slurry during paper making to make paper, a method of spraying the processing agent of the present invention on wet paper, a size press on paper, etc. Examples of the external addition method impregnated with the treating agent of the invention and the method of applying with a Myr one rod. Known methods such as bar coating, dipping, spraying, and coating (brush coating) can also be applied. Others, knife coater, blade coater 1, rod coater, air knife coater, squeeze coater, reno-ku slo-no-recoater, transferron no-recoater, gravure coater, kiss coater, cast coater, spray ¹ ~~ co ¹ ~~ tink Examples of the slot orifice fountain lever ¹ ~~~~~~, force `~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~, Moreover, you may use the processing agent of this invention for some paper manufacturing processes, such as a paper basket. Here, it is not necessary to apply it to the entire paper. It may be formed only on the parts that need to prevent the adhesion of organic matter (pollutants). For example, it may be applied only on one main surface of paper, or may be applied on both sides. Even when it is applied on one main surface, the object of the present invention is sufficiently achieved.

[0049] After applying the treatment agent of the present invention by such a method, the paper is dried. Various drying methods such as natural drying and rapid drying using a jet stream can be applied.

[0050] When such a drying operation is performed, a solvent such as water is dried and substantially removed from the paper. Therefore, the treating agent-containing film of the present invention includes the water-soluble organic acid salt, if necessary. It will contain the added water-soluble membrane constituents and other components.

[0051] The treating agent-containing film of the present invention is formed by treating a paper described later by the method as described above. The treatment agent-containing film of the present invention contains the water-soluble organic acid salt as an essential component, and is 50% by mass or more, particularly 70% by mass or more, and further 100% by mass of the total mass of the treatment agent-containing film of the present invention. % Is preferably the water-soluble organic acid salt. In addition, as the water-soluble organic acid salt, the water-soluble organic acid salt contained in the treatment agent of the present invention described above can be applied as it is.

Further, the treatment agent-containing film of the present invention preferably contains substantially no alkali component, that is, is alkali-free. The alkali component content of the treatment agent-containing film of the present invention is preferably 30 OOOppm or less, more preferably lOOOOppm or less. As described above, it is possible to prevent the alkali component from diffusing into the glass plate by not containing the alkali component in the treatment agent-containing film of the present invention.

[0052] The alkali component content of the treatment agent-containing film of the present invention is determined by subjecting part of the treatment agent-containing film of the present invention to wet decomposition with concentrated nitric acid and concentrated sulfuric acid, and appropriately diluting the resulting liquid. The value measured by ICP emission analysis.

[0053] The glass sheet that has been stored, transported, etc. by applying the interleaving paper having the treating agent-containing film of the present invention (the interleaving paper for glass of the present invention) is removed from the glass sheet and then treated according to the present invention. Even when the agent remains on the surface of the glass plate, it can be easily removed by simple water washing.

[0054] In addition, the glass plate that has been stored, transported, etc. by applying the glass interleaving paper of the present invention has a low rate of scratches. The reason for this is estimated by the present inventor as follows. is doing.

[0055] The treatment agent of the present invention contains the water-soluble organic acid salt as described above. The surface of the treated slip (glass slip sheet of the present invention) has elasticity. Elasticity reduces the coefficient of friction, which reduces friction with the contact glass (reducing contact resistance).

). On the other hand, the slip sheets described in Patent Documents 1 and 2 contain inorganic substances such as sodium tripolyphosphate and sodium tetraborate, and therefore have much lower elasticity than the slip sheet for glass of the present invention. Therefore, it is considered that generation of scratches on the surface of the glass plate is further suppressed when the glass interleaf of the present invention is used.

[0056] In addition, a liquid crystal display or the like manufactured using a glass plate that has been stored, transported, etc. by applying a slip sheet having a treatment agent-containing film of the present invention that does not contain an alkali component is a conventional slip sheet. Compared with the case of application, the malfunction occurrence rate is much lower.

[0057] As described above, the present inventor presumes the reason why the occurrence rate of malfunction of a liquid crystal display or the like is much lower than that in the past, as follows.

When an interleaving paper containing an alkali component is treated with a treating agent to be sandwiched between glass plates to form a glass laminate, from the interleaving paper to the surface of the glass plate due to some chemical or physical action. It is thought that the alkali component moves. A liquid crystal display manufactured using a glass plate having an alkali component on its surface is considered to malfunction.

On the other hand, when the treatment agent of the present invention that does not contain an alkali component is used, the movement of the alkali component is blocked, so that a malfunction of a liquid crystal display or the like caused by this does not occur. In addition, even if the alkali component is contained a little, the movement of the alkali is substantially barriered due to the characteristics of the film.

[0058] Further, as already described, the ratio of the remaining of the conventional treatment agent or the like on the surface of the glass plate after washing, and the rate of malfunction of the liquid crystal display or the like are increasing with the increase in the size of the glass plate in recent years. However, the inventor presumes the cause of this as follows.

When storing and transporting large areas of glass plates for liquid crystal displays, such as those of the 6th generation or more developed in recent years, it is difficult to place glass sheets diagonally, unlike when transporting small areas of glass plates. They must be stacked and transported. For this reason, the adhesion rate between the glass plate and the conventional slip sheet increases, and the load on the slip sheet also increases. As a result, the alkali component in the slip sheet is transferred to the glass plate by some chemical or physical action as described above. It is considered that the residual rate after movement and washing is further increased.

On the other hand, according to the treatment agent of the present invention, even in a large glass plate, the remaining ratio of the water-soluble organic acid salt on the surface of the glass plate after washing is low, and the malfunction rate of a liquid crystal display or the like is also low.

[0059] Fig. 1 is a side sectional view showing a glass interleaf of the present invention. The glass interleaving paper 1 of the present invention is a glass interleaving paper having a treating agent-containing film 20 containing a water-soluble organic acid salt on the paper 10. The paper 10 can be produced by treating the paper 10 with the treatment agent of the present invention by the method as described above, but the paper 10 coated with the treatment agent of the present invention is The properties, size, thickness, etc. are not particularly limited, and those usually used can be used. Further, it is possible to avoid the normal use for the lamination of glass and to use even interleaf paper with a high content of rosin. Normally, if slip paper with a high slag content is used, the slip content (mainly carbon) is transferred to the surface of the slip sheet glass plate and contaminates the glass plate surface. However, if treated with the treating agent of the present invention, the resin is difficult to transfer to the surface of the interleaf paper glass plate of the present invention.

Thus, when using paper as interleaving paper, it is often necessary to use special paper that does not contain grease or is very small even if it is V There was a problem with the cost of slipping paper. However, by using the glass interleaving paper of the present invention in which the processing agent-containing film of the present invention is formed on paper, it is possible to use ordinary paper containing a large amount of sorghum, which is excellent in terms of cost.

[0060] Specifically, for example, when used for a glass plate of the sixth generation size, paper having a size equal to or larger than the size of the glass plate (1500 mm x 1800 mm) can be used. The For example, a thickness of about 0.01 to 0.2 mm can be used.

[0061] Further, the raw material of the paper may be waste paper, virgin norp, or a mixture thereof. In addition, raw materials containing cellulose and the like may be used.

In addition, if the paper contains a sachet as a sizing agent, strength is imparted to the paper. For example, a slip sheet containing about 0.01 to 0.2% by mass of polyethylene rosin and the like can be mentioned. Also, the properties of the paper are not particularly limited. For example, the weight is about 1 to 60 gZm ² , the smoothness is about 1 to 40 sec, the air permeability is about 1.0 to 30 sec, and the pH is about 3 to 7 Paper It can be preferably used.

The glass interleaving paper 1 of the present invention can be produced by applying the treatment agent of the present invention to such paper 10 by the method as described above.

That is, the glass interleaving paper 1 of the present invention is a glass interleaving paper having a treatment agent-containing film 20 containing a water-soluble organic acid salt on the paper 10. “Water-soluble” and “organic acid salt” are as described above.

In the interleaving paper for glass 1 of the present invention, it is preferable that the treatment agent-containing film 20 does not contain an alkali component. This is because when the treatment agent-containing film 20 is alkali-free, that is, does not contain an alkali component, the malfunction occurrence rate of the liquid crystal is remarkably reduced. “Contains no alkali component” means that it contains substantially no alkali component, and means that the alkali component content in the treatment agent-containing film of the present invention is 30000 ppm or less. Furthermore, it is preferable that the alkali component content of the treatment agent-containing film of the present invention is lOOOOppm or less.

Further, the water-soluble organic acid salt is preferably a saccharide carboxylate. The reason is that when the treatment agent of the present invention is applied to paper, a uniform film can be formed more easily, and since it is a salt, the glass plate has a higher dissolution rate in water than acid. If it adheres, it can be easily removed by washing with water. The types of sugars are as described above. In addition, the treatment agent-containing film of the present invention may contain two or more of the water-soluble organic acid salts as described above. Even that case is within the scope of the present invention.

Further, the carboxylate power of the saccharide is preferably a carboxylate of the polysaccharide. Further, it is preferable that the polysaccharide is a carboxylate strength alginate ammonium. The reason why ammonium alginate is preferable is as described above.

The reason why water-soluble organic acid salts such as those described above are preferred is that, when the treatment agent of the present invention is applied to paper or the like, a uniform film can be formed more easily, and since it is a salt, it can be used in acid. This is because the rate of dissolution in water is higher. Moreover, even when a part of the film adheres to the glass plate when used as a slip sheet, it is also a force that can be easily washed away with water. In addition, because the material cost is low and biodegradability is high, it is an environmentally friendly material and suitable for industrial use. The treatment agent-containing film of the present invention contains a water-soluble organic acid salt, but the treatment agent-containing film of the present invention contains a water-soluble film constituent component and other components as long as the effects thereof are not impaired. May be. The water-soluble film constituent components are as described above. In addition, when the water-soluble organic acid salt and the water-soluble film component are mixed in the processing agent-containing film of the present invention! It is preferably 50% by mass or more, particularly preferably 80% by mass or more, and more preferably 100% by mass with respect to the total amount of the acid salt and the water-soluble film constituent component.

The treatment agent-containing film of the present invention can contain other components such as a surfactant, a dispersant, an antifoaming agent, and an antistatic agent as long as the effects of the present invention are not impaired. The content of the other component is preferably 0.001 to 1% by mass in the treatment agent-containing film, more preferably 0.005 to 0.5% by mass. 0.1% by mass is most preferred.

[0063] By using such a glass interleaving paper of the present invention and packaging a glass plate by the packaging method of the present invention, it can be stored and transported without causing scratches.

In addition, the glass sheet of the present invention can be used for storage and transportation without causing scratches by the scratch prevention method of the present invention that prevents the scratches of the glass plate from occurring. .

Further, in the packing method of the present invention and the scratch generation preventing method of the present invention, even if the components of the slip sheet adhere to the surface of the glass plate, they can be easily removed by washing with water and contain no environmentally hazardous substances. Even when applied to a large glass plate, the wastewater treatment at the time is simple and has the effect.

[0064] There are no particular limitations on the glass plate to which the glass interleaving paper of the present invention can be applied, and the shape and size can be stored and transported by laminating two or more of them, such as a plate shape or a substantially plate shape. Any thickness, thickness, etc. may be used.

For example, the glass plate may be not only a thin flat glass such as a liquid crystal glass plate but also a car front glass or a glass having a curved surface instead of a horizontal surface. Such glass is also a glass plate referred to in the present invention.

The glass slip sheet of the present invention is used as a slip sheet for protecting a portion called “kurosera” that is coated and baked with black ceramic material around the edge of the windshield glass on the car. If it is, the durability of Crocera can be maintained. In addition, when a slip sheet containing an acid component is used, the cloth may change to white, which can be suppressed.

[0065] In addition, the glass plate that can be used here may have a functional thin film on the surface of the glass plate. Specifically, functional thin films include conductive films (such as indium oxide (ITO), zinc oxide (ZnO), tin oxide (SnO), Ag, Cr, Cu, Cr structures), and heat ray shielding.

2

A shielding film (an oxide (for example, zinc oxide, titanium oxide, ITO, etc.), a layer having a ZAgZ oxide structure, etc.). Here, the zinc oxide may be doped with Al, Ga, hydrogen or the like. Tin oxide may be doped with F or Sb. Furthermore, Ag is doped with Pd or Au! /

[0066] When the glass interleaf of the present invention is used for an alkali-free glass plate used for a liquid crystal display or the like, it is preferable to use the glass interleaf of the present invention without containing an alkali component.

In this case, it is preferable because the occurrence rate of error motion of a liquid crystal display or the like manufactured using this alkali-free glass plate is significantly lower than that in the past.

In addition, if the glass interleaving paper of the present invention is applied to alkali-free glass used in liquid crystal displays, surface contamination and scratches that can cause malfunction of liquid crystal devices can be suppressed, and the percentage of defects can be reduced. It becomes possible to do. In addition, if the frequency of cracks during glass transportation or handling can be reduced, it will have a positive effect.

Here, the alkali-free glass plate means a glass plate having an alkali component content of 0.1% by mass or less with respect to its total mass.

Here, the “alkali” is an alkali metal element shown in the treatment agent of the present invention.

[0068] Further, the composition of the "alkali-free glass" other than alkali is, for example, 68% ≤SiO≤80%,

2

^{0% ≤A1 O <12 0/} 0, 0% <Β Ο Ku 7%, 0% ≤MgO≤12%, 0% ≤CaO≤15%,

2 3 2 3

0% ≤SrO≤4%, 0% ≤BaO≤l%. Here,% means mass%.

[0069] The method for producing the alkali-free glass is not particularly limited, and various production methods can be employed. For example, normally used raw materials are prepared so as to have the above composition, and this is heated and melted in a melting furnace at 1600 ° C to 1650 ° C. Bubbling is performed by homogenizing the glass by adding clarifiers or stirring. Display substrates such as liquid crystal displays and photos When used as a mask substrate, it is molded to a specified plate thickness by a known press method, downdraw method, float method, etc., and after slow cooling, processing such as polishing ij and polishing is performed to a predetermined size. The substrate is shaped.

Here, the alkali-free glass plate has a size of, for example, about the sixth generation (1500 mm × 180 Omm) developed recently. Further, the thickness of the glass plate is preferably 0.3 to 0.8 mm, and the preferred thickness is about 0.5 to 0.7 mm from the viewpoint of securing the strength.

[0071] When such a glass plate is stored and transported, it is a glass laminate in which at least two glass plates are laminated, and at least a part of the glass plate is used for the glass of the present invention. It is preferable to use a glass laminate with interleaf.

Such a glass laminate is also referred to as a glass laminate of the present invention.

[0072] If the glass laminate of the present invention is obtained by laminating two or more of the glass plates and interposing the glass interleaving paper of the present invention between at least some of the glass plates, the size, etc. Is not particularly limited.

For example, in the case of the glass laminate of the present invention in which about 500 glass substrates of the sixth generation size are laminated and the glass interleaving paper of the present invention is sandwiched between all the glass substrates, 1500 mm X 1800 mm The size is about X 386mm. This glass laminate is usually fixed and transported in a framework called a stack.

[0073] After the glass laminate of the present invention as described above is stored and transported, it is used at the production site of electronic circuits such as liquid crystal displays. It can also be used for various displays such as FED and photomask substrates as well as liquid crystal displays.

Then, the glass plate is washed with water, and at least a part, preferably all, of the treatment agent of the present invention attached to the surface is removed from the main surface of the glass plate. Thus, the glass plate from which the treatment agent of the present invention has been removed has less scratches and dirt even after storage and transportation compared to the conventional case. In addition, the incidence of malfunctions of liquid crystal displays manufactured using this is much lower than before. Furthermore, even in the case of a large glass substrate, it has the effect.

Example

<Examples 1-8> Eight types of paper (A to H) described below were prepared. These sizes were all 650 mm X 550 mm.

Then, 1.8% by mass of an aqueous solution of ammonium alginate (using pure water) was uniformly applied on one main surface of each paper by brushing. The alkali content in the treatment agent was 240 ppm or less. Further, the alkali content in the formed treating agent-containing film was 5000 ppm. The alkali content was measured by instrumental analysis after ashing the paper with film and extracting it with acid.

Paper C and D have the same force vine surface and a rough surface. In the case of paper C, an alginate aqueous solution of alginate was applied to the vine surface.

[0075] Next, after drying this using a nitrogen blower, the mass of the paper was accurately measured. Then, it was confirmed that the alginate ammonium was uniformly applied.

The presence and amount of ammonium alginate in the slip paper can be estimated from the presence of XPS Cls spectrum.

[0076] The eight types of paper are as follows.

Paper A: Product name: waste paper, manufactured by Tokai Pulp

Paper B: Product name: Pulp 100%, manufactured by Tokai Pulp

Paper C, D: Product name: Sensen paper, manufactured by Nagara Paper Co., Ltd.

Paper E: Product name: KSP paper, manufactured by Zhengzhou Paper Company

Paper F: Product name: Kirari S, manufactured by Daifuku Paper Co., Ltd.

Paper G: Product name: Kirari D, manufactured by Daifuku Paper Co., Ltd.

Paper H: Product name: HIP paper, manufactured by Toyonen Paper Co., Ltd.

[0077] Next, 16 alkali-free glass plates for liquid crystal display with a size of 650 X 550 X 0.7 mm were prepared, and each piece of glass was immersed in 0.01 mol Z liter NaOH aqueous solution for 30 seconds. Thereafter, it was washed with water and dried by blowing a nitrogen blower. No alkali remained on the surface of the glass plate.

The contact angle of the glass plate surface obtained here with water was measured by the above contact angle measurement method A. As a result, it was 8 degrees for all glass plates.

[0078] Next, the 16 glass plates were divided into 8 groups of 2 sheets, and each of the 16 glass plates Each of the papers A to H subjected to the above treatment was sandwiched and placed flat on a transport pallet. In this state, it was kept for 10 days in a constant temperature and humidity atmosphere of 20 ° C. and 80% RH.

[0079] Next, of each pair of glass plates, the glass plate that was in contact with the paper surface coated with the aqueous solution of alginate alginate was selected and cut into 10 x 10 cm squares. . Then, this was washed with a shower for 30 seconds under flowing pure water (3 liters Z min.) At 20 ° C. and then dried with a nitrogen blower. No film was visually observed on the surface of the glass plate that was in contact with the paper.

[0080] Next, a contact angle measurement between the glass plate after water washing obtained by the above operation and water and a peak intensity ratio (Cls / Si2p) of XPS (X-ray photoelectron spectroscopy) were performed. Here, the Cls peak was 284.6 eV, the Si2p peak was 103.4 eV, and the intensity ratio of ClsZSi2p was determined. The results are shown in Table 1. The strength ratio of ClsZSi2p is preferably 1.5 or less, particularly 1.0 or less, and more preferably 0.5 or less for practical use. The larger the intensity ratio of ClsZSi2p, the more C (carbon) remaining on the glass surface.

The contact angle was measured by «JIS-R3257 (contact angle meter: CA-A, manufactured by Kyowa Interface Science Co., Ltd.).

[0081] <Comparative Examples 1 to 8>

The same paper as the eight types of paper (A to H) used in Examples 1 to 8 above was prepared, and the same measurement was performed except that the alginate ammonia was not applied. The results are shown in Table 1.

[0082] From Table 1, when the papers of Comparative Examples 1 to 8 that were not coated with ammonium alginate were used, the contact angle with water on the glass plate surface increased (the glass plate surface was hydrophobic). It means having sex). In addition, it is easily estimated that the glass plate surface where the ClsZSi2p peak intensity ratio is large was contaminated with a resin component contained in the paper. In contrast, when the papers of Examples 1 to 8 coated with ammonium alginate were used, the contact angle with water on the glass plate surface after washing with water was as small as 10 ° or less (the glass plate surface became hydrophilic). Means). Furthermore, the ClsZSi2p peak intensity ratio is small, indicating that the glass plate surface is highly clean.

In addition, since the same results were obtained for all the papers of Examples 1 to 8, the treatment of the present invention. If the agent is used, it is possible to obtain the cleanliness of the glass plate surface regardless of the paper type and properties (oil and fat content, water absorption, surface smoothness, etc.). It was estimated that there was.

In Examples 1 to 8, the force of the test in which each of the papers A to H coated with ammonium alginate was sandwiched between two glass plates In Examples 9 to 16, 119 points between 120 glass plates Each of the papers A to H coated with ammonium alginate was sandwiched between them and subjected to AST MD 4728-95. Note that ASTM D 4728-95 [Glass plate after being subjected to the test specified here can be regarded as the same as the glass plate after truck transportation.

And after cutting out the glass plate to the same magnitude | size as Examples 1-8, and wash | cleaning and drying similarly, the presence or absence of the damage | wound was investigated under the high-intensity light source. As a result, no scratch was observed in any of the test pieces according to Examples 9 to 16. “No scratches are observed” means that no scratches were observed even when visually observed under a high-intensity light source.

[0084] <Comparative Examples 9 to 16>

Comparative Examples 9 to 16 were all subjected to the same tests and measurements as Examples 9 to 16 except that the alginate ammonium was not applied.

As a result, the test pieces according to Comparative Examples 9 to 16 were all found to have scratches.

[0085] From the results of these Examples and Comparative Examples, the paper surface-treated with the treatment agent of the present invention (the glass slip sheet of the present invention) is applied to the paper strength glass plate surface during storage and transportation. It can be seen that contamination transfer can be prevented. In addition, even when an external force is applied during transportation, the glass plate surface is prevented from being scratched due to direct friction between the glass plate and paper. Furthermore, it can be seen that this effect appears regardless of the type of paper and its properties (oil content, water absorption, surface smoothness, etc.). In addition, the liquid crystal displays manufactured using the glass plates obtained in Examples 1 to 16 have almost no malfunction, whereas they were manufactured using the glass plates obtained in Comparative Examples 1 to 16. Liquid crystal displays are found to malfunction.

[0086] [Table 1] Depends on J m PS

¾tt ^ / degree Cls / Si2 ratio of water

Example 1 A 8 0.2

Shelf 2 B 7 0. 1

誦 3 C 6 0. 1

辦 J4 D 6 0. 1

麵 5 E 7 0. 1

辦 F 10 0. 2

Example 7 G 5 0. 1

辦 H 5 0. 1

删 1 A 25 3. 0

Himon B 23 2. 8

腳 J3 C 27 3.1

4D 23 2. 8

腳 J 5 E 25 3. 0

t 麵 6 F 24 2. 9

Leg J7 G 18 2. 0

1: 薩 8 H 19 2. 0 Industrial Applicability

[0087] The interleaving paper for glass of the present invention is useful for liquid crystal displays and the like because it can prevent generation of scratches.

[0088] It should be noted that the entire contents of the specification, claims, drawings and abstract of Japanese Patent Application No. 2005-204433, filed on July 13, 2005, are incorporated herein by reference. It is incorporated as a disclosure of.

Claims

The scope of the claims

[I] A processing agent for processing paper sandwiched between glass plates, comprising a water-soluble organic acid salt.

[2] The treatment agent according to claim 1, wherein the treatment agent does not contain an alkali component.

[3] The treatment agent according to claim 1 or 2, wherein the water-soluble organic acid salt is a carboxylic acid salt of a saccharide.

[4] The treating agent according to [3], which is a carboxylate of a polysaccharide.

5. The treating agent according to claim 4, wherein the polysaccharide is a carboxylate strength of alginate.

6. The treating agent according to any one of claims 1 to 5, wherein the treating agent has a viscosity of 350 to 500 mPa's at 20 ° C.

[7] The content of the water-soluble organic acid salt is 0.01 to 90% by mass in the treatment agent.

6. The treatment agent according to item 1 above.

[8] The treatment agent contains a water-soluble organic acid salt and a water-soluble film-forming component, and the ratio of the water-soluble organic acid salt is the total amount of the water-soluble organic acid salt and the water-soluble film-forming component. The treatment agent according to any one of claims 1 to 7, which is 50% by mass or more based on.

[9] A slip sheet for glass formed by applying the treatment agent according to any one of claims 1 to 8 on paper.

10. The glass interleaving paper according to claim 9, wherein the glass interleaving paper is for non-alkali glass.

[II] The glass interleaving paper according to claim 9 or 10, wherein the glass interleaving paper is for glass having a size of 1500 mm X 1800 mm or more.

[12] A glass laminate in which at least two glass plates are laminated, wherein the glass interleaving paper according to any one of claims 9 to 11 is interposed between at least some of the glass plates. Glass laminate.

[13] The glass laminate according to [12], which is an alkali-free glass plate.

[14] A glass plate packing method for stacking and packing at least two or more glass plates, wherein at least a portion of the glass plates is a glass composite according to any one of claims 9 to 11. Paper Glass plate packing method to interpose.

[15] The glass plate packing method according to claim 14, wherein at least one of the glass plates has a functional thin film on the surface of the glass plate.

[16] A glass plate flaw prevention method for preventing the flaw of the glass plate by interposing the interleaving paper for glass according to any one of claims 9 to 11 between a plurality of glass plates.