JP2008208478A - Insertion paper for display glass and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an insertion paper used to be inserted between the glass plates for a display, preventing the deposition of paper dust caused by electrostatic charge and the generation of the damage and stain of the glass plate and also usable for a glass substrate having a functional membrane, and to provide a method for producing the insertion paper. <P>SOLUTION: The insertion paper for display glass plates has ≥50 mass% of bleached chemical pulp and contains a compound selected from 2-6C polyhydric alcohols, addition products obtained by adding 2-4C alkylene oxides to 2-6C polyhydric alcohols, addition products obtained by adding 2-4C alkylene oxides to 1-4C monohydric alcohols, and water-soluble polyether-modified silicones having a polyoxyalkylene skeleton and an HLB of ≥8. There is further provided a method for producing the insertion paper for display glass plates including the addition and deposition of the above compound during the paper-making process or to the produced paper. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an interleaf for display glass and a method for producing the same. More specifically, the present invention is used by sandwiching between glass plates for storage and transportation of displays such as liquid crystal displays, plasma displays, and organic EL displays. The present invention relates to a display glass interleaving paper and a method for producing the same, which can prevent adhesion and the generation of scratches and dirt on a glass plate.

Conventionally, multiple glass plates for liquid crystal displays, plasma displays, organic EL displays, etc. are stacked and stored, and in the distribution process of transporting by truck, etc., scratches and contamination on the glass surface are prevented and smooth. In order to easily take out individual glass plates and clean, cut, process, etc., a slip sheet is sandwiched between the glass plates.
When interleaving paper is interposed in this way, paper marks, water-repellent traces and paper burns are generated on the glass surface due to trace amounts of lignin and internal additives contained in the paper. The cleanliness is impeded, and before the process of sandwiching the interleaving paper, when removing the interleaving paper and performing processing such as cleaning, cutting, processing, etc., the working environment such as chips generated by cutting, paper dust, Scratches, dirt, etc., were sometimes caused by the adhering of dust generated by static electricity.
Various techniques have been developed to prevent the occurrence of such scratches and dirt. For example, a glass containing 0.1% by weight or more of sodium tripolyphosphate as a glass interleaving paper that can avoid water repellency and paper attraction on the glass surface and facilitates a cleaning process performed before using the glass. A slip sheet has been proposed (Patent Document 1). In addition, for glass containing 50 mg / m ² or more of sodium tetraborate as a glass interleaving paper from which the resin from the interleaving paper adhered to the glass surface can be easily removed by washing even after long-term storage A slip sheet has been proposed (Patent Document 2). However, these interleaving papers for glass are intended to make it possible to easily clean and remove the stain generated by the slip sheet, and do not prevent the occurrence of the stain itself.
In addition to preventing paper burns, as a slip-free interleaving paper, it is for glass made by applying water-soluble resin on both sides of dust-free paper composed of natural pulp and resin binder, without filler, and drying A slip sheet has been proposed (Patent Document 3). However, if this glass interleaving paper is stored and transported by laminating a plurality of glass plates, contamination by the resin binder in a high-temperature and high-humidity environment may occur, and it may be difficult to remove the contaminants by washing. There is a problem that it becomes difficult for the glass plates to be separated by being bonded with a resin binder. Furthermore, as an interleaving paper for glass that is easy to impart a high degree of cleanliness and can exhibit good workability, an average fiber length of 1.6 to 2.5 mm and a fiber length of 0.3 mm or less. A glass interleaving paper obtained by beating a natural pulp having a short fiber content of 7.0% by weight or less until a Canadian standard freeness (CSF) of 600 to 750 mL and making a paper is proposed. (Patent Document 4). However, this slip sheet for glass has a problem that the surface of the glass is damaged due to adhesion of chips due to static electricity.
The applicants of the present application, even if the laminated glass plate is stored for a long period of time, the surface of the glass plate that comes into contact with the glass interleaving paper causes a change in appearance such as a paper skin pattern or a discoloration that impairs the appearance. As a glass interleaving paper that does not have water repellency and can be processed without any hindrance such as vapor deposition on a glass plate surface, metal film treatment, and silver plating, For glass in which a compound selected from the group consisting of an alkylene oxide adduct obtained by adding 1 to 20 molecules of an alkylene oxide having 2 to 3 carbon atoms to one or all of the hydroxyl groups of a polyhydric alcohol per hydroxyl group is contained in paper. A slip sheet was proposed (Patent Document 5).
In recent years, glass plates used as substrates for electronic devices such as liquid crystal displays, plasma displays, and organic EL displays are formed on the glass plate through various metal film deposition and circuit printing processes. In order to reduce defects during these processes, they are handled in a clean room. Thus, in a glass plate, since high precision and high quality are requested | required, in order for the said problem to become the cause of the defect in various process processing, The requirements are also strict, and dust generation is inevitable when using conventional slip paper for glass, so it is difficult to suppress the contamination of the glass plate material production environment to the required level. For this reason, the above-mentioned slip sheet for glass is used for transportation and storage of a “glass substrate” formed with a functional film such as an ITO (indium tin oxide) film or a metal film for a matrix supplied to display processors. Is not used, but only used for a “glass base plate” used to form a functional film to form a glass substrate.
For such problems, as a packaging aid and packaging body that eliminates the need to touch the entire glass plate surface when using glass slip paper, thin and brittle plate-like bodies are spaced apart. It is for stacking, storing, transporting, etc., and is a narrow frame-like sheet-like material made of a rigid material, and a packaging aid having the shape of the periphery of the plate-like body, and There has been proposed a packaging body in which a necessary number of the plate-like bodies are superposed on the packaging aid via the packaging aid, the whole is fixed by a fixing means, and the whole is sealed and packaged ( Patent Document 6). However, this packaging aid and package are effective in reducing dust generation and contamination, but only a small number of glass-like plate materials can be transported and stored at one time, and logistics and storage costs are low. There is a problem that causes an increase. In recent years, since the required glassy plate materials are becoming larger and larger, the glassy plate materials are bent at the time of transportation in this packaging aid and package, and contact between the glassy plate materials is a big problem. It has become.
Therefore, a glass slip sheet that can be used for a glass substrate on which a functional film is formed has been demanded.
JP-A-6-316432 Japanese Patent Laid-Open No. 7-101483 JP-A-9-170198 JP 2005-248409 A JP 7-316998 A JP 2000-142873 A

  The present invention is used by being sandwiched between glass plates when storing and transporting glass plates for displays such as liquid crystal displays, plasma displays, and organic EL displays. A display / glass interleaving paper having excellent performance that can be used not only on a glass base plate but also on a glass substrate on which a functional film is formed, and preventing the occurrence of adhesion and scratches and dirt on the glass plate, and a method for producing the same It was made for the purpose of providing.

As a result of intensive studies to solve the above-mentioned problems, the inventors of the present invention are made of pulp containing 50% by mass of exposed chemical pulp, comprising 2 to 6 polyhydric alcohols and 2 to 6 carbons. An alkylene oxide adduct obtained by adding a C2-4 alkylene oxide to a monohydric alcohol, an alkylene oxide adduct obtained by adding a C2-4 alkylene oxide to a monohydric alcohol having 1 to 4 carbon atoms, or a polyoxyalkylene Glass interleaving paper containing a water-soluble polyether-modified silicone having a skeleton and an HLB average value of 8 or more prevents glass and paper dust from adhering to the glass plate for display due to the generation of static electricity. It has been found that generation of scratches and dirt on the plate can be prevented, and the present invention has been completed based on this finding.
That is, the present invention
(1) Paper which consists of pulp containing 50 mass% or more of bleached chemical pulp, Comprising: C2-C6 polyhydric alcohol, C2-C6 polyhydric alcohol, C2-C4 alkylene oxide An added alkylene oxide adduct, an alkylene oxide adduct obtained by adding a C2-C4 alkylene oxide to a C1-C4 monohydric alcohol, and a polyoxyalkylene skeleton, with an average HLB value of 8 or more And at least one compound selected from the group consisting of water-soluble polyether-modified silicones, and a display glass interleaving paper, and
(2) In a method for producing paper obtained by papermaking pulp containing 50% by weight or more of bleached chemical pulp, a polyhydric alcohol having 2 to 6 carbon atoms, a polyhydric alcohol having 2 to 6 carbon atoms and 2 to 2 carbon atoms An alkylene oxide adduct obtained by adding 4 alkylene oxides, an alkylene oxide adduct obtained by adding 2 to 4 carbon atoms to a monohydric alcohol having 1 to 4 carbon atoms, a polyoxyalkylene skeleton, and an HLB At least one compound selected from the group consisting of water-soluble polyether-modified silicones having an average value of 8 or more is added to and adhered to the paper during the paper making process or paper made. Paper manufacturing method,
Is to provide.

  The display / glass slip sheet of the present invention prevents adhesion of chips and paper dust due to the generation of static electricity on the glass plate for display, and can prevent the scratches and dirt on the glass plate from being generated. It can also be used for a glass substrate coated with a film. According to the method for producing a display glass slip sheet of the present invention, a display glass slip sheet having excellent performance that can be used not only on a glass base plate but also on a glass substrate coated with a functional film. Can be manufactured.

The interleaving paper for display glass of the present invention is a paper made of pulp containing 50% by mass or more of exposed chemical pulp, which is a C2-C6 polyhydric alcohol, a C2-C6 polyhydric alcohol and carbon. An alkylene oxide adduct obtained by adding an alkylene oxide having 2 to 4 carbon atoms, an alkylene oxide adduct obtained by adding an alkylene oxide having 2 to 4 carbon atoms to a monohydric alcohol having 1 to 4 carbon atoms, and a polyoxyalkylene skeleton And at least one compound selected from the group consisting of water-soluble polyether-modified silicones having an average HLB value of 8 or more.
In the manufacturing method of the display glass interleaving paper of the present invention, in the manufacturing method of paper obtained by making a pulp containing 50% by mass or more of exposed chemical pulp, a polyhydric alcohol having 2 to 6 carbon atoms, carbon number An alkylene oxide adduct obtained by adding an alkylene oxide having 2 to 4 carbon atoms to a polyhydric alcohol having 2 to 6 carbon atoms, an alkylene oxide adduct obtained by adding an alkylene oxide having 2 to 4 carbon atoms to a monohydric alcohol having 1 to 4 carbon atoms, And at least one compound selected from the group consisting of water-soluble polyether-modified silicones having a polyoxyalkylene skeleton and an HLB average value of 8 or more is added to the paper-making process or to the paper-made paper Adhere.

The bleached chemical pulp used in the present invention is a pulp in which lignin in the intermediate layer of the wood structure is chemically decomposed and eluted to isolate fibers, and the colored components are removed by bleaching. As raw materials for bleached chemical pulp, for example, conifers such as fir, tsuga, silabe, spruce, todomatsu, red pine, douglas fir, hemlock, white fur, spruce, beech, acacia, eucalyptus, mangrove, silver Examples include broad-leaved trees such as beach and lauan, mulberry, mitsumata, gambi, flax, cannabis, kenaf, manila hemp, abaca, sisal hemp, straw, sugarcane bagasse, bamboo, esparto, cotton and linter.
Examples of the chemical used for cooking the exposed chemical pulp include sulfite, bisulfite, caustic soda, sodium sulfide and the like. In cooking, oxygen, anthraquinone and the like can be used in combination. Examples of bleaching methods for bleaching chemical pulp include chlorination, alkali extraction, hypochlorite treatment, chlorine dioxide treatment, oxygen treatment, and hydrogen peroxide treatment. These treatment methods can be combined in an appropriate combination for multistage bleaching. The bleached chemical pulp used in the present invention preferably has an ISO whiteness measured according to JIS P 8148: 2001 of 70% or more, more preferably 85% or more, and even more preferably 90% or more.

Examples of the bleached chemical pulp used in the present invention include softwood bleached kraft pulp (NBKP), hardwood bleached kraft pulp (LBKP), softwood bleached sulfite pulp (NBSP), and hardwood bleached sulfite pulp (LBSP). The content of the bleached chemical pulp in the display glass interleaving paper of the present invention is 50% by mass or more, preferably 70% by mass or more, and more preferably 85% by mass or more. If the content of the exposed chemical pulp is less than 50% by mass, the glass substrate on which the functional film is formed may be damaged or stained.
In the present invention, the pulp of less than 50% by weight other than the bleached chemical pulp contained in the display glass interleaving paper, for example, softwood unbleached kraft pulp (NUKP), hardwood unbleached kraft pulp (LUKP), etc. Examples thereof include unbleached pulp, ground pulp (GP) obtained by mechanically treating wood and other plants, deinked pulp (DIP) obtained by regenerating a newspaper, paperboard, and the like.

  Examples of the carbon 2-6 polyhydric alcohol used in the present invention include ethylene glycol, propylene glycol, trimethylene glycol, 1,2-butylene glycol, 2,3-butylene glycol, 1,4-butylene glycol, neo and the like. Pentyl glycol, hexamethylene glycol, glycerin, trimethylolpropane, erythritol, threitol, pentaerythritol, diglycerin, sorbitan, arabitol, xylitol, ribitol, quecitolitol, sorbitol, mannitol, galactitol, allitol, allitolitol, iditol, inositol, quercitol , Conditol, mytilitol and the like. Among these, ethylene glycol, propylene glycol, butylene glycols, neopentyl glycol, hexamethylene glycol, glycerin, trimethylolpropane, diglycerin, xylitol, and sorbitol are effective in adhering chips and paper powder due to generation of static electricity. Therefore, it can be preferably used. When the number of carbon atoms of the polyhydric alcohol exceeds 6, the melting point becomes high or the solubility in water is lowered and handling becomes difficult, and there is a possibility that dirt and discoloration due to adhesion to the glass plate may occur.

Examples of the monohydric alcohol having 1 to 4 carbon atoms used in the present invention include methanol, ethanol, propanol, isopropanol, n-butanol, and isobutanol. When the number of carbon atoms of the monohydric alcohol exceeds 4, the hydrophobicity of the alkylene oxide adduct increases, so that the solubility in water is lowered, and there is a possibility that stain or discoloration due to adhesion to the glass plate occurs.
Examples of the alkylene oxide having 2 to 4 carbon atoms used in the present invention include ethylene oxide, propylene oxide, trimethylene oxide, tetrahydrofuran, 1,2-butylene oxide, 2,3-butylene oxide, and isobutylene oxide. it can. Among these, ethylene oxide, propylene oxide and trimethylene oxide can be suitably used because they can effectively prevent adhesion of chips and paper powder due to generation of static electricity. It can be particularly preferably used.
In this invention, there is no restriction | limiting in particular in the addition form of the alkylene oxide to a C2-C6 polyhydric alcohol or a C1-C4 monohydric alcohol, Single addition of 1 type of alkylene oxide, 2 or more types of alkylene Any of the addition of oxides can be used. When two or more types of alkylene oxide are added, the addition form can be appropriately selected from mixed addition (random addition), sequential addition (block addition), and the like. Among these, a combination of ethylene oxide single addition, mixed addition (random addition) or sequential addition (block addition) of ethylene oxide and propylene oxide or trimethylene oxide can be suitably used.

In the present invention, the amount of addition of alkylene oxide to polyhydric alcohol or monohydric alcohol is not particularly limited, but in the case of addition of alkylene oxide alone, it is 1 to 20 mol with respect to 1 mol of polyhydric alcohol or monohydric alcohol. It is preferable. When the amount of alkylene oxide added to the polyhydric alcohol or monohydric alcohol is 1 to 20 mol times, it effectively prevents the adhesion of chips and paper powder due to the generation of static electricity, and the generation of scratches and dirt on the glass plate Can be prevented. In addition, in the case of mixed addition (random addition) or sequential addition (block addition) of ethylene oxide and propylene oxide or trimethylene oxide, the amount of alkylene oxide is 2 to 30 mol per mol of polyhydric alcohol or monohydric alcohol. The amount of ethylene oxide is preferably 50% by mass or more based on the total alkylene oxide. When the addition amount of the mixed addition or sequential addition of the alkylene oxide to the polyhydric alcohol or the monohydric alcohol is 2 to 30 mol times, the solubility in water of the alkylene oxide adduct is not lowered, and the handling becomes easy and the effect In particular, adhesion of chips and paper powder due to generation of static electricity can be prevented, and scratches and dirt on the glass plate can be prevented.
Examples of the alkylene oxide having 2 to 4 carbon atoms used in the alkylene oxide adduct include ethylene oxide, trimethylene oxide, propylene oxide, tetrahydrofuran, 1,2-butylene oxide, 2,3-butylene oxide, isobutylene oxide, and the like. Can be mentioned. Among these, ethylene oxide, propylene oxide and trimethylene oxide can be suitably used because they can effectively prevent adhesion of chips and paper powder due to generation of static electricity. It can be particularly preferably used.

The polyether-modified silicone used in the present invention has a polyoxyalkylene skeleton and has an HLB average value of 8 or more and is water-soluble. More preferably, the HLB average value is 10 to 16 and is water-soluble. It is what has. Polyether-modified silicone having an HLB average value of 10 to 16 and water solubility effectively prevents adhesion of chips and paper dust due to generation of static electricity, and can prevent scratches and dirt on the glass plate. Can be used particularly preferably. Here, HLB (hydrophilic / lipophilic balance) is HLB according to the Griffin equation, and water-soluble means that it can be dissolved in water of 25 ° C. in an amount of 0.1% by mass or more.
In the present invention, as the polyether-modified silicone, one having an HLB of 8 or more and water-soluble can be used alone, or two or more can be used in combination. Moreover, if the average HLB value of the polyether-modified silicone is 8 or more and water-soluble, a water-soluble polyether-modified silicone having an HLB of less than 8 may be included. If the average value of the HLB of the polyether-modified silicone is less than 8, there is a possibility that adhesion of chips or paper powder due to generation of static electricity may occur. Furthermore, if the polyether-modified silicone is not water-soluble, there is a risk that chips and paper powder will adhere due to the generation of static electricity and the glass plate will become dirty.
The polyoxyalkylene skeleton of the polyether-modified silicone used in the present invention is not particularly limited, and examples thereof include a polyoxyethylene skeleton, a polyoxypropylene skeleton, a polyoxytrimethylene skeleton, a polyoxybutylene skeleton, and a polyoxytetramethylene skeleton. be able to. Examples of these skeletons include a single skeleton of one type of polyoxyalkylene, a mixed skeleton (random) of two or more types of polyoxyalkylene, and a sequential skeleton (block). You may introduce | transduce into the terminal, the side chain of silicone, or the principal chain. Among these, the polyoxyethylene skeleton, the mixed skeleton of the polyoxyethylene skeleton and the polyoxypropylene skeleton, or the sequential skeleton effectively prevents the adhesion of chips and paper powder due to the generation of static electricity, Since dirt can be prevented, it can be used particularly preferably.

As such a polyether-modified silicone, for example, methyl obtained by reacting an alcohol having a double bond such as allyl alcohol with an alkylene oxide and a silicone having an active hydrogen group such as methyl hydrogen silicone. Examples thereof include a side chain polyoxyalkylene type of hydrogen silicone and a methyl hydrogen silicone / polyoxyalkylene polymerization type. Examples of the alkylene oxide used for addition of an alkylene oxide to an alcohol having a double bond include ethylene oxide, propylene oxide, trimethylene oxide, tetrahydrofuran, 1,2-butylene oxide, 2,3-butylene oxide, isobutylene oxide, and the like. Can be mentioned.
Among the above compounds, a polyhydric alcohol having 2 to 6 carbon atoms, an alkylene oxide adduct obtained by adding an alkylene oxide having 2 to 4 carbon atoms to a polyhydric alcohol having 2 to 6 carbon atoms, 1 having 1 to 4 carbon atoms An alkylene oxide adduct obtained by adding an alkylene oxide having 2 to 4 carbon atoms to a monohydric alcohol effectively prevents adhesion of chips and paper powder due to generation of static electricity, and can prevent scratches and dirt on the glass plate. Therefore, it is preferable to use a polyhydric alcohol having 2 to 6 carbon atoms and an alkylene oxide adduct obtained by adding an alkylene oxide having 2 to 4 carbon atoms to a polyhydric alcohol having 2 to 6 carbon atoms. it can.

The interleaving paper for display glass of the present invention preferably has a water absorption of 20 to 60 mm for 10 minutes measured at 20 ° C. according to JIS P 8141: 2004. When the water absorption for 10 minutes is from 20 to 60 mm, it is possible to improve the prevention of stains on the glass plate.
In the method for producing a display glass interleaving paper of the present invention, it is preferable to beat exposed chemical pulp so that the Canadian standard freeness (CSF) is 400 to 800 mL, and beaten to be 550 to 750 mL. It is more preferable. When the Canadian standard freeness of bleached chemical pulp is 400 to 800 mL, it is effective in combination with polyhydric alcohol, polyhydric alcohol alkylene oxide adduct, monohydric alcohol alkylene oxide adduct or polyether-modified silicone. In addition, it is possible to improve the prevention of scratches and dirt on the glass plate. The Canadian standard freeness (CSF) can be measured using a Canadian standard freeness tester according to JIS P 8121: 1995.

In the method of the present invention, a polyhydric alcohol, an alkylene oxide adduct of a polyhydric alcohol, an alkylene oxide adduct of a monohydric alcohol, or water is used during the paper making process of the pulp containing 50% by mass or more of the exposed chemical pulp. There is no particular limitation on the method of adding and attaching the soluble polyether-modified silicone. When adding and attaching the soluble polyether-modified silicone during the papermaking process, for example, the above compound is used as it is, or water, methanol, ethanol, isopropyl alcohol, etc. It can be diluted or dissolved in a lower alcohol and added and adhered immediately after the disaggregation step, before and after beating, before and after preparation of a paper stock to which chemicals are added, before paper making, and before and after recycling of used paper. In addition, when adhering to paper made by adding paper, for example, the above compound is used as it is or diluted or dissolved in water or lower alcohol such as methanol, ethanol, isopropyl alcohol, impregnation, size press, calendar It can be applied by impregnation or application using a coater, gate roll coater, spray or the like. The adhesion amount to which the above compound is added and adhered is preferably 0.05 to 5.0% by mass, more preferably 0.2 to 4.0% by mass with respect to the paper. When the adhesion amount of the above-mentioned compound to the paper is 0.05 to 5.0% by mass, it is possible to effectively prevent the adhesion of the paper powder due to the generation of static electricity and the generation of scratches and dirt on the glass plate. Among these methods of adding and adhering to the above compounds, the method of adding to and adhering to paper-made paper is more effective for the adhesion of paper dust due to the generation of static electricity and the generation of scratches and dirt on the glass plate. Since it can prevent, it uses especially suitably. In the present invention, the paper-made paper is not limited to a product wound on a reel, including wet paper sent to a press part, a dryer part, etc. after leaving the wire part.
In the present invention, other chemicals can be used in combination as long as they do not impair the prevention of adhesion of chips and paper dust due to the generation of static electricity and the prevention of scratches and dirt on the glass plate. Other agents include, for example, surfactants, solvents, wet paper strength agents, dry paper strength agents, paper strength agents such as starch and polyvinyl alcohol, dryer release agents, pitch control agents, slime control agents, sizing agents, paper quality Examples include improvers, fillers, pigments, dyes, and antifoaming agents.

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.
In Examples and Comparative Examples, evaluation of display / glass interleaving paper was performed by the following method. Moreover, the glass base plate for liquid crystals and the glass substrate for ITO thin film formation liquid crystal were used as display glass.
(1) Water Absorption The water absorption by the Krem method of the display / glass interleaving paper was measured as the water absorption height rising to the test piece for 10 minutes at 20 ° C. according to JIS P 8141: 2004.
(2) Surface resistance value After leaving the display / glass interleaving paper in an atmosphere of 20 ° C. and 40% RH for 24 hours, the surface resistance value of the display / glass interleaving paper was measured using a surface resistance meter [Toa Denpa Kogyo ( , SUPER MEGOHMMETER SM-5E].
(3) Adhesiveness between glass plate and glass interleaving paper Adhesion between display glass interleaving paper and display glass is allowed to stand in an atmosphere of 20 ° C. and 40% RH for 24 hours. The degree of sticking when the glass interleaving paper was peeled was evaluated based on the following four evaluation criteria.
4: No sticking (no resistance when peeled off).
3: There is a little sticking (a little resistance is felt when peeling).
2: There is sticking (feels resistance when peeling).
1: Sticking is large (a large resistance is felt when peeling).
(4) Scratch Using a surface property measuring instrument [Shinto Kagaku Co., Ltd., Type 14S], a display glass slip sheet (63.5 × 100 mm) is attached to the upper part, and a display glass (100 × 200 mm) is attached to the lower part. Attached. On the surface of the lower display glass, 0.05 g of sea sand [Showa Chemical Co., Ltd., particle size 200-300 mesh] 0.05 g as a glass swarf is uniformly placed and brought into contact with the upper display glass interleaving paper. A load of 2N was applied to the upper part, and the lower display glass was moved at a speed of 20 mm / min for 10 seconds. Next, the surface of the display glass was visually observed at a magnification of 100 using a microscope, and evaluated based on the following four evaluation criteria.
4: No scratch.
3: There are some scratches.
2: There is a wound.
1: Many scratches.
(5) Dirt Adhesive paper for display glass (100 × 200 mm) and display glass (100 × 200 mm) are closely attached and left in an atmosphere of 50 ° C. and 90% RH for 100 hours. The glass interleaving paper was peeled off, and the degree of contamination on the glass surface was visually determined by the cloudiness when the breath was blown on the glass surface. Judgment was evaluated based on the following four evaluation criteria. The more dirt is seen, the more fogging occurs.
4: No cloudiness.
3: About 1/4 or less of the glass plate is clouded.
2: About 1/4 to 1/2 of the glass plate is clouded.
1: About 1/2 or more of the glass plate is clouded.

Example 1
Exposed kraft pulp (LBKP / NBKP = 20/80 (mass ratio) CSF = 700 mL) Using 5% by mass of pulp slurry, a square sheet machine [Kumaya Riki Kogyo Co., Ltd.] with a basis weight of 40 g / m ² The paper was made in such a way that it was pressed at 0.7 MPa for 5 minutes with a press [Kumagaya Riki Kogyo Co., Ltd.] and then dried at 105 ° C. for 3 minutes with a Yankee dryer [Kumagaya Riki Kogyo Co., Ltd.]. I got paper.
Next, using ethylene glycol as an additive and using a treatment solution dissolved in water so that the additive is contained in an amount of 3.0% by mass, the amount of the additive adhered to the sample paper is 3.0% by mass. It was impregnated so as to be, and dried at 105 ° C. for 3 minutes with a Yankee dryer [Kumaya Riki Kogyo Co., Ltd.] to obtain a display glass interleaving paper.
The obtained display glass slip sheet had a water absorption of 37 mm and a surface resistance of 6.1 × 10 ¹¹ Ω. In the sticking property test, there was no sticking to the glass base plate, but there was some sticking to the glass substrate. In the scratch test, no scratch was observed on the glass base plate and the glass substrate. In the stain test, no stain was observed on both the glass base plate and the glass substrate.
Examples 2 to 25, Comparative Examples 1 to 5
Display glass interleaving paper was produced and evaluated in the same manner as in Example 1 using the additives and pulp shown in Table 1.
The additives and pulps used in Examples 1 to 25 and Comparative Examples 1 to 5 are shown in Table 1, and the evaluation results of the obtained display glass slip sheets are shown in Table 2.

[Note] EO: Ethylene oxide, PO: Propylene oxide, LBKP: Hardwood bleached kraft pulp, NBKP: Softwood bleached kraft pulp, LBSP: Hardwood bleached sulfite pulp, NBSP: Softwood bleached sulfite pulp, LUKP: Hardwood unbleached kraft pulp, LBKP : Unexposed kraft pulp of conifers, GP: ground pulp, DIP: deinked pulp.

  As can be seen in Table 2, in the display glass interleaving paper obtained in Examples 1 to 25, the water absorption is large, the surface resistance value is small, and the display glass and glass interleaving paper are stuck. There are few scratches and dirt on the display glass. In particular, in Examples 1 to 18 containing a polyhydric alcohol or an alkylene oxide adduct of a polyhydric alcohol, almost no adhesion between the display glass and the glass interleaf, or scratches or stains on the display glass are observed. On the other hand, in Comparative Example 2 using paper obtained by making pulp containing 40% by mass of exposed chemical pulp, the water absorption of the interleaving paper for glass is small, and scratches and dirt are generated on the display glass. is doing. Further, Comparative Examples 3 to 4 containing an alkylene oxide adduct of a polyhydric alcohol having 10 carbon atoms or a monohydric alcohol having 6 carbon atoms and a polyether-modified silicone having a polyoxyalkylene skeleton of HLB 6.9 are contained. In Comparative Example 5, the water absorption of the glass slip sheet is small, the display glass and the glass slip sheet are adhered, and scratches and dirt on the display glass are also seen.

Example 26
Using a 5% by weight pulp slurry of bleached kraft pulp (LBKP / NBKP = 20/80, CSF = 700 mL), a basis weight of 40 g / m ² is obtained with a square sheet machine [Kumaya Riki Kogyo Co., Ltd.]. And press for 5 minutes at 0.7 MPa with a press [Kumagaya Riki Kogyo Co., Ltd.], then dry with a Yankee dryer [Kumagaya Riki Kogyo Co., Ltd.] for 3 minutes at 105 ° C. Obtained.
Next, using ethylene glycol as an additive and using a treatment solution dissolved in water so that the additive is contained in an amount of 2.0% by mass, the adhering amount of the additive is 2.0% by mass with respect to the sample paper. It was spray-treated so as to be, and dried at 105 ° C. for 3 minutes with a Yankee dryer [Kumaya Riki Kogyo Co., Ltd.] to obtain a display glass interleaving paper.
The obtained display glass slip sheet had a water absorption of 36 mm and a surface resistance of 6.4 × 10 ¹¹ Ω. In the sticking property test, there was no sticking to the glass base plate, but there was some sticking to the glass substrate. In the scratch test, no scratch was observed on the glass base plate and the glass substrate. In the stain test, no stain was observed on both the glass base plate and the glass substrate.
Examples 27-50, Comparative Examples 6-10
Display glass interleaving paper was produced and evaluated in the same manner as in Example 26 using the additives and pulp shown in Table 3.
The additives and pulps used in Examples 26 to 50 and Comparative Examples 6 to 10 are shown in Table 3, and the evaluation results of the obtained display glass slip sheets are shown in Table 4.

[Note] EO: Ethylene oxide, PO: Propylene oxide, LBKP: Hardwood bleached kraft pulp, NBKP: Softwood bleached kraft pulp, LBSP: Hardwood bleached sulfite pulp, NBSP: Softwood bleached sulfite pulp, LUKP: Hardwood unbleached kraft pulp, LBKP : Unexposed kraft pulp of conifers, GP: ground pulp, DIP: deinked pulp.

  As can be seen in Table 4, in the display glass slip sheets obtained in Examples 26 to 50, the water absorption is large, the surface resistance value is small, and the display glass and the glass slip sheet are stuck. There are few scratches and dirt on the display glass. Particularly in Examples 26 to 43 containing a polyhydric alcohol or an alkylene oxide adduct of polyhydric alcohol, almost no adhesion between the display glass and the interleaving paper for glass, and scratches or dirt on the display glass were observed. On the other hand, in Comparative Example 7 using paper obtained by making pulp containing 40% by mass of exposed chemical pulp, the water absorption of the interleaving paper for glass is small, and scratches and dirt are generated on the display glass. is doing. Further, Comparative Examples 8 to 9 containing an alkylene oxide adduct of a polyhydric alcohol having 10 carbon atoms or a monohydric alcohol having 6 carbon atoms, and a polyether-modified silicone having a polyoxyalkylene skeleton having an HLB of 6.9 In Comparative Example 10 contained, the water absorption of the glass slip sheet is small, the display glass and the glass slip sheet are adhered, and scratches and dirt on the display glass are also seen.

  The display glass slip sheet of the present invention is used by being sandwiched between glass plates for displays such as liquid crystal displays, plasma displays, organic EL displays, etc., and prevents adhesion of chips and paper dust due to the generation of static electricity. Generation | occurrence | production of the damage | wound and stain | pollution | contamination of a board can be prevented, and it can be used not only for a glass base plate but for a glass substrate coated with a functional film. According to the method for producing a display glass slip sheet of the present invention, a display glass slip sheet having excellent performance that can be used not only on a glass base plate but also on a glass substrate coated with a functional film. Can be manufactured.

Claims (2)

  Exposed chemical pulp made of pulp containing 50% by mass or more, alkylene having 2 to 4 carbon atoms and polyhydric alcohol having 2 to 6 carbon atoms added with alkylene oxide having 2 to 4 carbon atoms Oxide adducts, alkylene oxide adducts obtained by adding alkylene oxides having 2 to 4 carbon atoms to monohydric alcohols having 1 to 4 carbon atoms, and water-soluble compounds having a polyoxyalkylene skeleton and an average value of HLB of 8 or more A display glass interleaving paper comprising at least one compound selected from the group consisting of polyether-modified silicones.   In a method for producing paper obtained by papermaking pulp containing 50% by mass or more of exposed chemical pulp, polyhydric alcohol having 2 to 6 carbon atoms, polyhydric alcohol having 2 to 6 carbon atoms and alkylene having 2 to 4 carbon atoms An alkylene oxide adduct obtained by adding an oxide, an alkylene oxide adduct obtained by adding an alkylene oxide having 2 to 4 carbon atoms to a monohydric alcohol having 1 to 4 carbon atoms, and a polyoxyalkylene skeleton, and the average value of HLB is Manufacture of interleaving paper for display glass characterized in that at least one compound selected from the group consisting of 8 or more water-soluble polyether-modified silicones is added to and adhered to the paper during the paper making process or paper Method.