JP2016190667A - Slip paper foe glass plate and manufacturing method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slip paper for glass plates used as a substrate material for a flat panel display which requires high cleanness and flaw quality, and which can reduce pollution on a surface of the glass to a practically problem-free level.SOLUTION: A slip paper for a glass plate made from wood pulp as a raw material is applied with a coloring agent or a color developer on a surface.SELECTED DRAWING: None

Description

  In the process of laminating and storing and transporting a plurality of glass plates for flat panel displays such as liquid crystal displays, plasma displays, organic electroluminescence (organic EL) displays, etc., the paper for packaging the glass plates, and The present invention relates to a paper sandwiched between glass plates and a method for producing these papers.

  In general, in the process of laminating and storing a plurality of glass plates for flat panel display, the distribution process of transporting by a truck etc., the glass plates are impacted and contacted to generate scratches, In order to prevent the glass surface from being contaminated, paper called interleaving paper is sandwiched between glass plates.

  Glass plates for flat panel displays are used for high-definition displays compared to general architectural window glass plates, vehicle window glass plates, etc., so impurities on the glass surface are as much as possible on the glass surface. It is required to have a clean surface, and to have excellent flatness for high-speed response and widening of the viewing angle.

  Several slip sheets used for such applications have already been proposed as slip sheets that can prevent breakage of the glass plate and scratches on the surface, and slip sheets that do not contaminate the glass surface. For example, Patent Document 1 discloses a technique for forming a fluorine coating film on the surface of a slip sheet. Further, Patent Document 2 includes a paper sheet in which a polyethylene resin foam sheet and a polyethylene resin film are bonded, and Patent Document 3 includes a paper made of pulp containing 50 mass% or more of exposed chemical pulp. In addition, there is a paper for glass containing a specific alkylene oxide adduct and water-soluble polyether-modified silicone, and Patent Document 4 defines the amount of resin in the paper and considers contamination of the glass surface. A glass sheet plywood using the prepared raw materials is disclosed.

  However, these slip sheets do not completely prevent contamination of the glass plate surface for flat panel displays. In some cases, the glass plate surface contamination for some reason increases the defect rate of the glass plate. There is a real situation.

  In recent years, in particular, from the viewpoint of profitability, a high yield is required in the manufacturing process of flat panel displays and the like, and it is important how to prevent contamination of the surface of glass plates used for flat panel displays.

  Therefore, Patent Document 5 describes that the amount of silicone contained in the interleaf paper for glass plate is limited.

JP 2012-188785 A JP 2010-242057 A JP 2008-208478 A JP 2006-44674 A International Publication No. 2014/104187

  The present invention can reduce the contamination of the glass surface to a practically no problem level for glass plates used as substrate materials for flat panel displays that require high cleanliness and scratch quality. It is an object to provide a slip sheet and a method for manufacturing the slip sheet.

  For example, it is known that when a glass plate surface is contaminated during the production of a color filter substrate in an array process, which is one of the manufacturing processes of a TFT liquid crystal display, problems such as disconnection occur. The color filter substrate is made by forming a thin film such as a semiconductor film, ITO film (transparent conductive film), insulating film, aluminum metal film, etc. on a glass plate by sputtering or vacuum evaporation, but it is a contaminant on the glass plate surface. This is because a circuit pattern formed from a thin film is disconnected or a short circuit occurs due to a defect in the insulating film. In the production of a color filter substrate, a photolithography pattern is formed on a glass plate. If contaminants are present on the glass plate surface during resist coating in this process, pinholes are generated in the resist film after exposure and development. As a result, disconnection or short circuit occurs. Similar problems have been confirmed in the manufacture of organic EL displays. An organic EL display is manufactured by forming a thin film such as an ITO anode, an organic light emitting layer, or a cathode on a glass substrate by sputtering, vapor deposition, printing, etc., and therefore does not emit light when a foreign substance that obstructs the thin film exists on the glass substrate surface Problems arise.

  The cause of contamination of such a glass plate has been difficult to identify, but it has been proved by the present inventors that the cause is a hydrophobic substance such as silicone contained in the slip sheet for glass plate.

  Therefore, it is conceivable that the total amount of the hydrophobic substance in the glass sheet interleaf (hereinafter, also referred to as “glass sheet interleaf”) is kept below a certain level. However, it is sometimes difficult to reduce the contamination of the glass plate surface derived from the hydrophobic substance to a practically no problem level only by limiting the total amount of the hydrophobic substance.

  As a result of further intensive studies, the present inventors have found that the above problem can be solved by visualizing the state of the hydrophobic substance present on the surface of the interleaf paper for glass plate, and have completed the present invention.

  Since a hydrophobic substance repels a colorant or color former, when a colorant or color former is applied to a slip sheet for glass plate, the hydrophobic substance present on the surface of the slip sheet repels the colorant or color former, and the hydrophobic substance The area where the active substance is present is not colored or colored. Therefore, in this invention, the hydrophobic substance scattered on the surface of the glass sheet interleaving paper can be identified based on the presence or absence of coloring or coloring on the surface.

  And in this invention, the contamination of the surface of the said slip sheet is grasped | ascertained by presence of the hydrophobic substance of the surface of the slip sheet for glass plates identified as mentioned above, for example, there is no contamination or there is little contamination degree By selecting and using the interleaving paper, it is possible to reduce the contamination of the surface of the glass plate derived from the hydrophobic substance to a level at which there is no practical problem.

  The first aspect of the present invention relates to a glass sheet slip sheet made from wood pulp, wherein the colorant or color former is applied to the surface.

  The colorant can be an aqueous dye.

  The colorant may be a pigment.

  The color former is preferably one that develops color when irradiated with electromagnetic waves.

  It is preferable that the colorant or color former is applied for detection of a non-colored or non-colorable discontinuous region present on the surface.

In the slip sheet for glass plate of the present invention, it is preferable that non-colored or non-coloring discontinuous regions having a minimum diameter of 30 μm or more existing on the surface are 15/1000 m ² or less.

  The discontinuous region may include a hydrophobic material. The hydrophobic material may include silicone. The silicone is preferably silicone oil. The silicone oil is preferably dimethylpolysiloxane.

  The glass plate is preferably used for a display, and in particular, the display is preferably a TFT liquid crystal display or an organic EL display.

The second aspect of the present invention is a method for producing a glass sheet interleaving paper made of wood pulp,
The present invention relates to a production method including a step of applying a colorant or a color former to a glass sheet interleaving paper for detection of a non-colored or non-coloring discontinuous region present on the surface of the glass sheet interleaving paper.

  Moreover, this invention is a laminated body with the said glass plate interleaving paper and glass plate of the 1st aspect of this invention, and the said glass plate interleaving paper of the 1st aspect of this invention between several glass plates. The present invention also relates to a method for protecting a glass plate including an inserting step.

  The slip sheet for glass plate of the present invention can easily identify hydrophobic substances scattered on the surface of the slip sheet for glass plate based on the presence or absence of coloring or coloring on the surface. The identification can be easily performed visually.

  In the present invention, a region made of a hydrophobic substance present on the surface of a glass sheet slip sheet can be easily identified as a non-colored or non-colored region present on the surface. For example, the number of the regions is measured. By doing this, the wood pulp for glass board interleaving paper or the glass board interleaving paper which met the selection criteria can be easily selected. This makes it possible to select and use slip sheets that are free of contamination or have a low degree of contamination, and reduce contamination of the glass plate surface derived from the hydrophobic material to a level that is practically free of problems. it can.

Furthermore, when the ratio of non-colored or non-coloring discontinuous regions having a minimum diameter of 30 μm or more present on the surface of the glass sheet interleaf of the present invention is 15/1000 m ² or less, Rather than keeping the total amount of hydrophobic substance below a certain level, the number of problematic hydrophobic substance regions that are locally present on the surface of the slip sheet for glass sheets is kept below a certain level, so transfer to the glass sheet. Potential spots of hydrophobic material can be controlled at an individual level, making it easier to reduce contamination of the glass plate surface from the hydrophobic material to a practically no problem level.

  Therefore, by using the present invention, transfer of a hydrophobic substance such as silicone to a glass plate can be suppressed or avoided. Thus, by suppressing or avoiding the transfer of the hydrophobic substance to the glass plate, it becomes possible to prevent the circuit breakage of the color film or the like in the manufacturing process of the TFT liquid crystal display or the like.

  The present invention relates to a slip sheet for glass plate made of wood pulp as a raw material, wherein the colorant or color former is applied to the surface.

  The colorant is not particularly limited as long as it can color wood pulp or slip paper, and for example, dyes, pigments, and mixtures thereof can be used.

  Any dye can be used. The dye is preferably hydrophilic and more preferably an aqueous dye.

  In the present invention, the mode of dyeing (coloring) with an aqueous dye is not particularly limited. Aqueous dyes are hydrophilic and can be dissolved in water. Any water-based dye can be used, and examples thereof include acid dyes, direct dyes, and basic dyes. Specific examples of the aqueous dye include C.I. I. (Color index) Direct black 9, 17, 19, 22, 32, 38, 51, 56, 62, 69, 71, 77, 80, 91, 94, 97, 105, 108, 112, 113, 114, 117, 118, 121, 122, 125, 132, 146, 154, 166, 168, 173, 199, C.I. I. Direct violet 7, 9, 47, 48, 51, 66, 90, 93, 94, 95, 98, 100, 101, C.I. I. Direct Red 23, 83, 227, C.I. I. Direct yellow 8, 9, 11, 12, 27, 28, 29, 33, 35, 39, 41, 44, 50, 53, 58, 59, 68, 86, 87, 93, 95, 96, 98, 100, 106, 108, 109, 110, 130, 132, 144, 161, 163, C.I. I. Direct Blue 1, 10, 15, 22, 25, 55, 67, 68, 71, 76, 77, 78, 80, 84, 86, 87, 90, 98, 106, 108, 199, 201, 202, 236, 237, 244, 251, 280, C.I. I. Acid Black 7, 24, 29, 31, 48, 52, 94, C.I. I. Acid Violet 5, 34, 43, 47, 48, 90, 103, C.I. I. Acid Red 87, 186, 254, 289, C.I. I. Acid Yellow 17, 19, 23, 25, 39, 40, 42, 44, 49, 50, 61, 110, 174, 218, C.I. I. Acid Blue 9, 25, 40, 41, 62, 72, 76, 78, 80, 82, 106, 112, 120, 205, 230, 234, 271, 280 and the like.

  Any pigment can be used. As the pigment, inorganic pigments, organic pigments, and mixtures thereof can be used. The pigment is preferably hydrophilic and more preferably water-dispersible.

  Examples of inorganic pigments include titanium dioxide, zinc white (zinc oxide), iron oxide, chromium oxide, iron black, cobalt blue, alumina white, iron oxide yellow, viridian, zinc sulfide, lithopone, vermilion, cadmium red, yellow Lead, molybdate orange, zinc chromate, strontium chromate, white carbon, cray, talc, ultramarine, precipitated barium sulfate, barite powder, calcium carbonate, lead white, ferrocyanide (bituminous), phosphate (manganese violet), Examples thereof include carbon black.

  Examples of organic pigments include rhodamine lake, methyl violet lake, quinoline yellow lake, malachite green lake, alizarin lake, carmine 6B, lake red C, disazo yellow, lake red 4R, chromophthal yellow 3G, chromophthalscarlet RN, nickel. Azo Yellow, Permanent Orange HL, Phthalocyanine Blue, Phthalocyanine Green, Flavanthrone Yellow, Thioindigo Bordeaux, Perrin Red, Dioxadone Violet, Quinacridone Red, Naphthol Yellow S, Pigrant Green B, Lumogen Yellow, Signal Red, Alkaline Blue, Aniline Black etc. are mentioned.

  The color former is not particularly limited as long as it has a property of coloring by stimulation such as electromagnetic wave irradiation and can color wood pulp or interleaf. For example, a color former or chemical substance that develops color by electromagnetic wave irradiation. A color former that develops color when contacted with it and a mixture thereof can be used.

  Any color former that develops color when irradiated with electromagnetic waves can be used. A fluorescent color former that develops fluorescence by irradiation with ultraviolet rays, infrared rays, or the like is preferable. As the fluorescent color former, for example, the following can be used.

(Ultraviolet fluorescent color former) Inorganic compounds such as Ca ₂ B ₅ O ₃ Cl: Eu ²⁺ , CaWO ₄ , ZnO: Zn ₂ SiO ₄ : Mn, Y ₂ O ₂ S: Eu, ZnS: Ag, YVO ₄ : Eu, Alternatively, diaminostilbene-based C.I. I. 40600 Fluorescent Brightening Agent 30, C.I. I. 40620 Fluorescent Brightening Agent 32, C.I. I. 40605 FBA 34, C.I. I. 40630 FBA1, thiazole C.I. I. Organic compounds such as 49015 FBA 41.

(Infrared fluorescent color former) YF ₃ : YB, Er, ZnS: CuCo, LiNd _0.9 Yb _0.1 P ₄ O ₁₂ , LiBi _0.2 Nd _0.7 Yb _0.1 P ₄ O ₁₂ , Nd _{0. 9} Inorganic compounds such as Yb _0.1 Nd ₅ (MoO ₄ ) ₄ .

  Any color former that develops color upon contact with a chemical substance can be used. For example, 3,3-bis (p-dimethylaminophenyl) -6-dimethylaminophthalide (common name crystal violet lactone), 3,3-bis (p-dimethylaminophenyl) -6-diethylaminophthalide, 3, 3-bis (p-dimethylaminophenyl) -6-chlorophthalide, 3,3-bis (p-diethylaminophenyl) -6-diethylaminophthalide, 3,3-bis (p-dibutylaminophenyl) phthalide, 3,3 -Bis (p-dimethylaminophenyl) -6-diethylaminoazaphthalide, 3-diethylamino-6-methyl-7-anilinofluorane, 3- (Np-tolyl-N-ethylamino) -6-methyl -7-anilinofluorane, 3-N-methyl-N-amylamino-6-methyl-7-anilinofluorane, 3-diethylamino-7 (O-chloroanilino) fluorane, 3-dibutylamino-7- (o-chloroanilino) fluorane, 3-diethylamino-6-methyl-7-anilinofluorane, 6'-bromo-3'-methoxy-benzoindolino- Pyrrospirane, 3- (2′-hydroxy-4′-dimethylaminophenyl) -3- (2′-methoxy-5′-chlorophenyl) phthalide, and the like are ethyl p-hydroxybenzoate, butyl p-hydroxybenzoate, benzyl p-hydroxybenzoate, 4,4-isopropylidenediphenol, 4,4-isopropylidenebis (2-chlorophenol), 4,4-isopropylidenebis (2-methylphenol), 4,4-isopropylidene Bis (2,6-dimethylphenol), 4-hydroxyphenyl-2'-hydroxy Enylsulfone, catechol, resorcin, thymol, fluorocricin, phloroglysin carboxylic acid, N, N-diphenylthiourea, Np-butylphenyl-N'-phenylthiourea, benzoic acid, 4-hydroxy-4'-chlorodiphenyl Since color is developed by reaction with a developer such as sulfone, bis (4-hydroxyphenyl) sulfide, o-sulfophthalimide, 5-octyl-o-sulfophthalimide, etc., it can be used as a color former in the present invention.

  The application of the colorant or the color former can be carried out, for example, by applying a composition such as a solution or a dispersion containing the colorant or the color former on the interleaf paper for glass plate. Alternatively, the glass sheet interleaving paper may be immersed in a composition such as a solution or a dispersion containing a colorant or a color former. It is preferable to apply an aqueous solution of an aqueous dye to a glass sheet interleaf. It is preferable to dry the glass sheet interleaf after the application or immersion. The concentration of the colorant or color former in the composition is not particularly limited, but is preferably 0.001 to 20% by weight, more preferably 0.01 to 10% by weight, and 0.1 to 1% by weight. Is even more preferred.

  The colorant or color former used in the present invention preferably lacks affinity with a hydrophobic substance such as silicone. Therefore, the colorant or color former is preferably hydrophilic.

  Moreover, in this invention, it is preferable that a coloring agent or a color former is applied for the detection of the non-colored or non-color-forming discontinuous area | region which exists on the surface of the paper for glass plates.

  By the application, the colorant or color former is fixed on the surface of the interleaving paper for glass plate. However, when a hydrophobic substance is present on the surface of the interleaf paper, the hydrophobic substance repels the colorant or color former. A region where the hydrophobic substance exists is not colored and becomes a “non-colored discontinuous region”, or a region where the hydrophobic substance exists does not develop color and becomes a “non-colored discontinuous region”. Therefore, in the present invention, the hydrophobic substance scattered on the surface of the slip sheet for glass plate can be identified by the non-colored or non-colored region on the surface of the slip sheet. The identification can be made visually and is easy.

  In the present invention, “non-colored discontinuous region” and “non-coloring discontinuous region” (also referred to as “non-colored or non-coloring discontinuous region”) are regions that are not colored even when a colorant is applied, Further, it means that the region does not develop color even when a color former is applied, and that a certain non-colored or non-colored region is separated from other non-colored or non-colored regions. Therefore, there can be a plurality of non-colored or non-coloring discontinuous regions, and specifically, they can be scattered in the form of dots (dots) or spots (spots).

  The hydrophobic substance is not particularly limited as long as it repels a colorant or a color former. The hydrophobic substance is preferably non-volatile, and includes aliphatic hydrocarbons, vegetable oils, animal oils, synthetic glycerides, fatty alcohols, fatty acids, fatty alcohols and / or esters of fatty acids, resins (except silicone), and More preferably, it is selected from the group consisting of silicones, and in particular, it is even more preferred that it contains or is silicone.

  Aliphatic hydrocarbons include, for example, linear or branched hydrocarbons, especially mineral oil (liquid paraffin, etc.), paraffin, petrolatum, ie petrolatum, naphthalene, etc .; hydrogenated polyisobutene, isoeicosane, polydecene, pearl reamer And polyisobutenes and decene / butene copolymers; and mixtures thereof.

As examples of other aliphatic hydrocarbons, mention may also be made of linear, branched or optionally cyclic C ₆ -C ₁₆ lower alkanes. Examples that may be mentioned include hexane, undecane, dodecane, tridecane and isoparaffins such as isohexadecane and isodecane.

  Examples of vegetable oils include, for example, linseed oil, camellia oil, macadamia nut oil, sunflower oil, apricot oil, soybean oil, arara oil, hazelnut oil, corn oil, mink oil, olive oil, avocado oil, southern oil, castor oil , Safflower oil, jojoba oil, sunflower oil, almond oil, grape seed oil, sesame oil, soybean oil, peanut oil, and mixtures thereof.

  Examples of animal oils include, for example, squalene, perhydrosqualene, and squalane.

  Examples of synthetic glycerides include caprylic / capric triglycerides.

  Fatty acids should be in acidic form (ie not in salt form to avoid soaping) and may be saturated or unsaturated and have 6 to 30 carbon atoms, especially 9 to 30 carbons. Contains atoms and is optionally substituted, in particular with one or more hydroxyl groups (especially 1 to 4). When the fatty acid is unsaturated, the compound can contain 1 to 3 conjugated or non-conjugated carbon-carbon double bonds. The fatty acid is selected from, for example, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, linoleic acid, linolenic acid and isostearic acid.

The term “aliphatic alcohol” as used herein means any saturated, linear or branched C ₈ -C ₃₀ alcohol, optionally, especially one or more hydroxyl groups ( In particular, 1 to 4) are substituted.

Among the aliphatic alcohols, C _{12 to} C ₂₂ aliphatic alcohols are preferable, and C _{16 to} C ₁₈ saturated aliphatic alcohols are more preferable. Among these, lauryl alcohol, cetyl alcohol, stearyl alcohol, isostearyl alcohol, oleyl alcohol, behenyl alcohol, undecyl alcohol, myristyl alcohol, and mixtures thereof can be mentioned.

Examples of esters of fatty acids and / or fatty alcohols are saturated or unsaturated, linear or branched C ₁ -C ₂₆ aliphatic mono- or polyacid esters, and saturated or unsaturated, linear Jo or branched C ₁ -C ₂₆ monohydric alcohol or polyhydric alcohol esters of aliphatic can particularly mention, the total number of carbon atoms in the ester is preferably 10 or more.

  The resin (excluding silicone) is not particularly limited as long as it is hydrophobic. Examples of the resin include thermoplastic resins such as polyolefin, polystyrene, poly (meth) acrylate, polyacrylamide, polyvinyl chloride, polyvinylidene chloride, polyacrylonitrile, polyester, polycarbonate, polyamide, polyimide, polyurethane, melamine resin, and urea resin. And the like, and a mixture thereof.

Silicone includes silicone oil. Silicone oil is hydrophobic and its molecular structure may be cyclic, linear or branched. Kinematic viscosity at 25 ° C. of the silicone oil is usually in the range of 0.65~100,000mm ² / s, it may be in the range of ^{0.65~10,000mm} 2 / s.

  Examples of silicone oils include linear organopolysiloxanes, cyclic organopolysiloxanes, and branched organopolysiloxanes.

Ｒ^１ _{（４−ｃ）}Ｓｉ（ＯＳｉＲ^１ _３）_ｃ （３）

（式中、
Ｒ^１は、それぞれ独立して、水素原子、水酸基、或いは、置換若しくは非置換の一価炭化水素基、アルコキシ基で示される基から選択される基であり、
ａは、０〜１０００の整数であり、
ｂは３〜１００の整数であり、
ｃは１〜４の整数、好ましくは２〜４の整数である）
で表されるオルガノポリシロキサンが挙げられる。 Examples of the linear organopolysiloxane, cyclic organopolysiloxane, and branched organopolysiloxane include the following general formulas (1), (2), and (3):

R ¹ ₃ SiO— (R ¹ ₂ SiO) _a —SiR ¹ ₃ (1)

R ¹ _(4-c) Si (OSiR ¹ ₃ ) _c (3)

(Where
Each R ¹ is independently a hydrogen atom, a hydroxyl group, or a group selected from a group represented by a substituted or unsubstituted monovalent hydrocarbon group or an alkoxy group;
a is an integer of 0 to 1000;
b is an integer of 3 to 100;
c is an integer of 1 to 4, preferably an integer of 2 to 4)
The organopolysiloxane represented by these is mentioned.

  A substituted or unsubstituted monovalent hydrocarbon group is typically a substituted or unsubstituted one having 1 to 30 carbon atoms, preferably 1 to 10 carbon atoms, more preferably 1 to 4 carbon atoms. Valent saturated hydrocarbon group; substituted or unsubstituted monovalent unsaturated hydrocarbon group having 2 to 30 carbon atoms, preferably 2 to 10 carbon atoms, more preferably 2 to 6 carbon atoms; carbon atom A monovalent aromatic hydrocarbon group having a number of 6 to 30, more preferably 6 to 12 carbon atoms.

  Examples of the monovalent saturated hydrocarbon group having 1 to 30 carbon atoms include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a sec-butyl group, and a tert-butyl group. A linear or branched alkyl group such as a pentyl group, a hexyl group, a heptyl group, an octyl group, a nonyl group and a decyl group, and a cycloalkyl group such as a cyclopentyl group, a cyclohexyl group, a cycloheptyl group and a cyclooctyl group. Can be mentioned.

  Examples of the monovalent unsaturated hydrocarbon group having 2 to 30 carbon atoms include a vinyl group, 1-propenyl group, allyl group, isopropenyl group, 1-butenyl, 2-butenyl group, pentenyl group, hexenyl group and the like. A linear or branched alkenyl group; a cycloalkenyl group such as a cyclopentenyl group and a cyclohexenyl group; a cycloalkenylalkyl group such as a cyclopentenylethyl group, a cyclohexenylethyl group and a cyclohexenylpropyl group; and an ethynyl group and a propargyl group And alkynyl groups such as groups.

  Examples of the monovalent aromatic hydrocarbon group having 6 to 30 carbon atoms include aryl groups such as a phenyl group, a tolyl group, a xylyl group, and a mesityl group. A phenyl group is preferred. In addition, in this specification, the aromatic hydrocarbon group includes a group in which an aromatic hydrocarbon and an aliphatic saturated hydrocarbon are combined in addition to a group consisting of only an aromatic hydrocarbon. Examples of the group in which an aromatic hydrocarbon and a saturated hydrocarbon are combined include an aralkyl group such as a benzyl group or a phenethyl group.

  The hydrogen atom on the monovalent hydrocarbon group may be substituted with one or more substituents, and examples of the substituent include a halogen atom (a fluorine atom, a chlorine atom, a bromine atom and an iodine atom), a hydroxyl group , Carbinol group, epoxy group, glycidyl group, acyl group, carboxyl group, amino group, methacryl group, mercapto group, amide group, oxyalkylene group and the like. Specifically, 3,3,3-trifluoropropyl group, 3-chloropropyl group, 3-hydroxypropyl group, 3- (2-hydroxyethoxy) propyl group, 3-carboxypropyl group, 10-carboxydecyl group , 3-isocyanatopropyl group and the like.

  Examples of the alkoxy group include a methoxy group, an ethoxy group, and a propoxy group, but a methoxy group or an ethoxy group is preferable, and a methoxy group is more preferable.

  More specifically, the linear organopolysiloxane may be a trimethylsiloxy group-blocked dimethylpolysiloxane having a molecular chain at both ends (a low-viscosity dimethylsilicone such as 2 mPa · s or 6 mPa · s to a high-viscosity dimethylsilicone such as 1 million mPa · s). ), Organohydrogenpolysiloxane, trimethylsiloxy group-capped methylphenyl polysiloxane with both molecular chains, trimethylsiloxy group-capped dimethylsiloxane / methylphenylsiloxane copolymer with both molecular chains, trimethylsiloxy group-capped diphenylpolysiloxane with both molecular chains , Trimethylsiloxy group-blocked dimethylsiloxane / diphenylsiloxane copolymer, both ends of molecular chain, Trimethylpentaphenyltrisiloxane, Phenyl (trimethylsiloxy) siloxane, Trimethylsiloxy group-blocked methyl at both ends of molecular chain Alkylpolysiloxane, trimethylsiloxy group-capped dimethylpolysiloxane / methylalkylsiloxane copolymer with both ends of molecular chain, trimethylsiloxy group-capped dimethylsiloxane / methyl (3,3,3-trifluoropropyl) siloxane copolymer with molecular chain at both ends , Α, ω-dihydroxypolydimethylsiloxane, α, ω-diethoxypolydimethylsiloxane, 1,1,1,3,5,5,5-heptamethyl-3-octyltrisiloxane, 1,1,1,3 5,5,5-heptamethyl-3-dodecyltrisiloxane, 1,1,1,3,5,5,5-heptamethyl-3-hexadecyltrisiloxane, tristrimethylsiloxymethylsilane, tristrimethylsiloxyalkylsilane, tetrakis Trimethylsiloxysilane, tetramethyl-1,3- Examples include hydroxydisiloxane, octamethyl-1,7-dihydroxytetrasiloxane, hexamethyl-1,5-diethoxytrisiloxane, hexamethyldisiloxane, octamethyltrisiloxane, higher alkoxy-modified silicone, higher fatty acid-modified silicone, and dimethiconol. The

  Examples of cyclic organopolysiloxanes include hexamethylcyclotrisiloxane (D3), octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5), dodecamethylcyclohexasiloxane (D6), and 1,1-diethylhexamethyl. Cyclotetrasiloxane, phenylheptamethylcyclotetrasiloxane, 1,1-diphenylhexamethylcyclotetrasiloxane, 1,3,5,7-tetravinyltetramethylcyclotetrasiloxane, 1,3,5,7-tetramethylcyclotetra Siloxane, 1,3,5,7-tetracyclohexyltetramethylcyclotetrasiloxane, tris (3,3,3-trifluoropropyl) trimethylcyclotrisiloxane, 1,3,5,7-tetra (3-methacryloxypro L) Tetramethylcyclotetrasiloxane, 1,3,5,7-tetra (3-acryloxypropyl) tetramethylcyclotetrasiloxane, 1,3,5,7-tetra (3-carboxypropyl) tetramethylcyclotetrasiloxane 1,3,5,7-tetra (3-vinyloxypropyl) tetramethylcyclotetrasiloxane, 1,3,5,7-tetra (p-vinylphenyl) tetramethylcyclotetrasiloxane, 1,3,5, 7-tetra [3- (p-vinylphenyl) propyl] tetramethylcyclotetrasiloxane, 1,3,5,7-tetra (N-acryloyl-N-methyl-3-aminopropyl) tetramethylcyclotetrasiloxane, 1 , 3,5,7-tetra (N, N-bis (lauroyl) -3-aminopropyl) tetramethyl An example is rotetrasiloxane.

  Examples of the branched organopolysiloxane include methyltristrimethylsiloxysilane, ethyltristrimethylsiloxysilane, propyltristrimethylsiloxysilane, tetrakistrimethylsiloxysilane, and phenyltristrimethylsiloxysilane.

  As the silicone oil in the present invention, dimethylpolysiloxane, diethylpolysiloxane, methylphenylpolysiloxane, polydimethyl-polydiphenylsiloxane copolymer, polymethyl-3,3,3-trifluoropropylsiloxane and the like are preferable. As the silicone in the present invention, dimethylpolysiloxane is typical.

  The silicone oil in the present invention may be a modified silicone oil. Examples of the modified silicone oil include polyoxyalkylene-modified silicone oil.

  The polyoxyalkylene-modified silicone oil is a silicone oil having a polyoxyalkylene group bonded to the molecule via a silicon-carbon bond, and preferably exhibits water solubility at room temperature, specifically at 25 ° C. More preferably, it is a nonionic one.

Specifically, the polyoxyalkylene-modified silicone oil is, for example, a copolymer of a silicone oil made of linear or branched siloxane and a polyoxyalkylene, and there are various types. ) Is preferred.

R ² ₃ SiO— (R ¹ ₂ SiO) _d — (R ¹ ASiO) _e —SiR ² ₃ (4)

(Where
R ¹ is independently the same as above,
Each R ² is independently R ¹ or A;
A is each independently a group represented by R ³ G, R ³ is a substituted or unsubstituted divalent hydrocarbon group, and G is a carbon number of 2 to 5 such as ethylene oxide and propylene oxide. A polyoxyalkylene group comprising at least one alkylene oxide of
d represents an integer of 1 to 500;
e represents an integer of 1 to 50).

  Examples of the substituted or unsubstituted divalent hydrocarbon group include a linear or branched divalent hydrocarbon group having 1 to 30 carbon atoms, and specifically include a methylene group, a dimethylene group, and trimethylene. A linear or branched alkylene group having 1 to 30 carbon atoms such as a group, a tetramethylene group, a pentamethylene group, a hexamethylene group, a heptamethylene group, an octamethylene group; a vinylene group, an arylene group, a butenylene group, Alkenylene groups having 2 to 30 carbon atoms such as hexenylene group and octenylene group; arylene groups having 6 to 30 carbon atoms such as phenylene group and diphenylene group; alkylene arylene groups having 7 to 30 carbon atoms such as dimethylenephenylene group And hydrogen atoms bonded to carbon atoms of these groups are at least partially halogen atoms such as fluorine, hydroxyl groups, , Carbinol group, epoxy group, a glycidyl group, an acyl group, a carboxyl group, an amino group, a methacryl group, a mercapto group, an amide group, and substituted groups in the organic group containing an oxyalkylene group or the like. The divalent hydrocarbon group is preferably an alkylene group having 1 to 30 carbon atoms, preferably an alkylene group having 1 to 6 carbon atoms, and more preferably an alkylene group having 3 to 5 carbon atoms.

（式中、
ｘは２０〜１６０、ｙは１〜２５であり、ｘ／ｙの値は５０〜２であり、
Ａは、例えば−（ＣＨ_２）_３Ｏ−（ＣＨ_２ＣＨ_２Ｏ）_ｍ−（ＣＨ_２ＣＨ_２ＣＨ_２Ｏ）_ｎ−Ｒ^４であり、ｍは７〜４０、ｎは０〜４０、ｍ＋ｎの値は少なくとも１であり、グラフト重合されたものでもランダム重合されたものでもよく、Ｒ^４は水素原子又は上記置換若しくは非置換の一価炭化水素基を表す。好適には、ｍは７〜３０、ｎは０〜３０である） For example, specific examples of the polyoxyalkylene-modified silicone oil include the following.

(Where
x is 20 to 160, y is 1 to 25, and the value of x / y is 50 to 2,
A is, for example, — (CH ₂ ) ₃ O— (CH ₂ CH ₂ O) _m — (CH ₂ CH ₂ CH ₂ O) _n —R ⁴ , where m is 7 to 40, n is 0 to 40, m + n The value of is at least 1 and may be graft polymerized or randomly polymerized, and R ⁴ represents a hydrogen atom or the above substituted or unsubstituted monovalent hydrocarbon group. Preferably, m is 7-30 and n is 0-30)

  Examples of the modified silicone oil include aminoalkyl-modified silicone oil.

  The aminoalkyl-modified silicone oil is a silicone oil having an aminoalkyl group bonded to the molecule through a silicon-carbon bond, and preferably has a viscosity of 10 to 100,000 cs at room temperature, specifically at 25 ° C. It is.

As the aminoalkyl silicone oil, in the above formula (4), G is represented by the formula: — (NR ⁴ CH ₂ CH ₂ ) _z NR ⁴ ₂ (wherein R ⁴ is independently as defined above, z Is a number of 0 ≦ z ≦ 4).

When interleaving paper is used on a glass plate, hydrophobic substances such as silicone in the interleaving paper tend to be transferred to the glass plate, and in particular, the number of hydrophobic substance regions having a minimum diameter of 30 μm or more present on the surface is 15 It has now been clarified that the use of slip sheets exceeding 1000 pieces / 1000 m ² increases the amount of hydrophobic substances transferred to the glass plate, and as a result, the tendency to cause problems during panel formation increases.

Accordingly, the interleaving paper for glass plate of the present invention preferably has 15 non-colored or non-coloring discontinuous regions having a minimum diameter of 30 μm or more present on the surface thereof, of 15/1000 m ² or less.

The number of non-colored or non-coloring discontinuous regions in the glass sheet interleaf is more preferably 12 pieces / 1000 m ² or less, still more preferably 10 pieces / 1000 m ² or less, and 8 pieces / 1000 m ^2. preferably even more or less, it is preferably more than that five / 1000 m ² or less, preferably more than that three / 1000 m ² or less, particularly preferably 1/1000 m ² or less. Further, the number of the non-colored or non-colored discontinuous regions is preferably 4/10 kg or less, more preferably 3/10 kg or less, more preferably 2 / kg per weight of the glass sheet interleaf. More preferably, it is 10 kg or less, even more preferably 1/10 kg or less, even more preferably 0.5 / 10 kg or less, and particularly preferably 0.1 / 10 kg or less. preferable. The weight here refers to the weight of the slip sheet containing 10% by weight of moisture.

  The form of the non-colored or non-coloring discontinuous region is arbitrary, and may be various shapes such as a circle, an ellipse, and a square, but is preferably a circle or an ellipse.

  The minimum diameter of the non-colored or non-coloring discontinuous region is preferably 25 μm or more, more preferably 20 μm or more, still more preferably 15 μm or more, still more preferably 10 μm or more, still more preferably 5 μm or more, and even more preferably 1 μm or more. 0.5 μm or more is particularly preferable. For example, when the non-colored or non-coloring discontinuous region is elliptical, the major axis is preferably 25 μm or more, more preferably 20 μm or more, still more preferably 15 μm or more, still more preferably 10 μm or more, and even more preferably 5 μm or more. Preferably, 1 μm or more is even more preferable, and 0.5 μm or more is particularly preferable. When the non-colored or non-coloring discontinuous region is non-circular or non-elliptical, the equivalent area circle diameter is preferably 25 μm or more, preferably 20 μm or more, more preferably 15 μm or more, and even more preferably 10 μm or more, 5 μm or more is even more preferable, 1 μm or more is even more preferable, and 0.55 m or more is particularly preferable.

  The maximum diameter of the non-colored or non-coloring discontinuous region is preferably 10 mm or less, more preferably 5 mm or less, still more preferably 3 mm or less, still more preferably 1 mm or less, still more preferably 500 μm or less, and even more preferably 100 μm or less. The thickness is preferably 50 μm or less. For example, when the non-colored or non-coloring discontinuous region is oval, the major axis is preferably 10 mm or less, more preferably 5 mm or less, still more preferably 3 mm or less, and even more preferably 1 mm or less. 500 μm or less is even more preferable, 100 μm or less is even more preferable, and 50 μm or less is particularly preferable. When the non-colored or non-coloring discontinuous region is non-circular or non-elliptical, the equivalent area circle diameter is preferably 10 mm or less, preferably 5 mm or less, more preferably 3 mm or less, even more preferably 1 mm or less, 500 μm or less is even more preferable, 100 μm or less is even more preferable, and 50 μm or less is particularly preferable.

  It is preferable that a non-colored or non-coloring discontinuous region having a maximum diameter of more than 10 mm does not exist on the surface of the glass sheet interleaf of the present invention.

  The amount of silicone contained in the wood pulp of the present invention or the wood pulp used as the raw material of the glass plate of the present invention is 0.5 ppm or less with respect to the absolute dry mass of the slip paper or wood pulp. Preferably, it is 0.4 ppm or less, more preferably 0.3 ppm or less, even more preferably 0.2 ppm or less, and particularly preferably 0.1 ppm or less. When there is more than 0.5ppm of silicone, color film breaks caused by a small amount of silicone transferred to the glass in high-definition scenes such as mobile devices that require a very high-definition display are highly detailed. This is because there is an increased risk of being conspicuous and being judged as a quality defect. In the present invention, “absolutely dry” means a state in which moisture is not substantially present in an object to be dried by drying. For example, at the room temperature (25 ° C.) of an object in an “absolutely dry” state. The weight change per hour is 1% or less, preferably 0.5% or less, more preferably 0.1% or less.

  In general, wood pulp often contains silicone. This is because silicone-based antifoaming agents are frequently used as antifoaming agents used to prevent deterioration in cleaning performance due to foam generation in the wood pulp manufacturing process, particularly in the washing step. The agent-derived silicone remains in the pulp. The silicone-based antifoaming agent is produced, for example, by mixing a modified silicone, a surfactant or the like with a mixture of silicone oil and hydrophobic silica.

Therefore, in order to obtain a glass sheet interleaf having no silicone or a low silicone content, the minimum diameter of 30 μm or more present on the surface of the glass sheet interleaf of the present invention after application of the colorant or color former is particularly preferred. In order to make the non-colored or non-coloring discontinuous region of 15/1000 m ² or less, it is important that the wood pulp used as the raw material of the interleaf does not contain much silicone. The means for reducing the silicone content in the wood pulp that is the raw material of the slip paper is not particularly limited, but it is preferable to use a non-silicone-based antifoaming agent as an antifoaming agent used during wood pulp production. .

  Examples of non-silicone-based antifoaming agents include mineral oil-based antifoaming agents, higher alcohol-based antifoaming agents, fatty acid-based antifoaming agents, fatty acid ester-based antifoaming agents, amide-based antifoaming agents, and amine-based antifoaming agents. , Phosphate ester defoamers, metal soap defoamers, sulfonate ester defoamers, polyether defoamers and vegetable oil defoamers.

  The mineral oil-based antifoaming agent includes, for example, mineral oil such as hydrocarbon oil, mineral wax, and the like.

  The higher alcohol antifoaming agent includes, for example, octyl alcohol, hexadecyl alcohol and the like.

  The fatty acid-based antifoaming agent includes, for example, palmitic acid, oleic acid, stearic acid and the like.

  The fatty acid ester antifoaming agent includes, for example, isoamyl stearate, glycerin monoricinolate, sorbitol monolaurate, soliitol trioleate and the like.

  The amide antifoaming agent includes, for example, acrylate polyamine.

  The amine-based antifoaming agent includes, for example, diallylamine.

  The phosphate ester antifoaming agent includes, for example, tributyl phosphate, sodium octyl phosphate and the like.

  The metal soap type antifoaming agent includes, for example, aluminum stearate, calcium stearate, potassium oleate and the like.

  The sulfonate ester antifoaming agent includes, for example, sodium lauryl sulfonate, sodium dodecyl sulfonate, and the like.

  Polyether-based antifoaming agents include, for example, polyoxyalkylenes such as (poly) oxyethylene (poly) oxypropylene adducts; diethylene glycol heptyl ether, polyoxyethylene oleyl ether, polyoxypropylene butyl ether, polyoxyethylene polyoxypropylene (Poly) oxyalkylene alkyl ethers such as 2-ethylhexyl ether, higher alcohols having 8 or more carbon atoms and secondary alcohols having 12 to 14 carbon atoms such as oxyethyleneoxypropylene adducts; polyoxypropylene phenyl ether, polyoxy (Poly) oxyalkylene (alkyl) aryl ethers such as ethylene nonylphenyl ether; 2,4,7,9-tetramethyl-5-decyne-4,7-diol, 2,5-dimethyl-3-hex Acetylene ethers obtained by addition polymerization of alkylene oxide to acetylene alcohols such as 2-methyl-2-butanol, 3-methyl-1-butyn-3-ol; diethylene glycol oleate, diethylene glycol laurate, ethylene glycol distearate (Poly) oxyalkylene fatty acid esters such as polyoxyethylene sorbitan monolaurate, (poly) oxyalkylene sorbitan fatty acid esters such as polyoxyethylene sorbitan trioleate; polyoxypropylene methyl ether sodium sulfate, polyoxyethylene (Poly) oxyalkylene alkyl (aryl) ether sulfate esters such as sodium dodecylphenol ether sulfate; (poly) oxyethylene Stearylphosphate esters of (poly) oxyalkylene alkyl phosphoric acid esters; polyoxyethylene such as polyoxyethylene lauryl amine (poly) oxyalkylene alkyl amines; containing polyoxyalkylene amide.

  The vegetable oil-based antifoaming agent includes, for example, vegetable oils such as soybean oil, corn oil, coconut oil, linseed oil, rapeseed oil, cottonseed oil, sesame oil, castor oil and the like.

  The non-silicone antifoaming agent can contain inorganic particles such as hydrophobic silica. As the hydrophobic silica, it is preferable to use silica hydrophobized by substituting silanol groups of hydrophilic silica with alkyl groups such as methyl groups.

  The non-silicone antifoaming agent can also contain a surfactant or the like as necessary. Accordingly, the non-silicone antifoaming agent may be an emulsion type.

The wood pulp used for the production of the glass board interleaving paper of the present invention is the hand pulp after application of the colorant or color former to the hand paper prepared by the method according to JIS P 8222 using the wood pulp. The number of non-colored discontinuous regions having a minimum diameter of 30 μm or more present on the surface of the paper is preferably 50/1000 m ² or less. Thereby, it becomes easy to set the number of regions having a minimum diameter of 30 μm or more of a hydrophobic substance such as silicone existing on the surface of the glass sheet interleaf of the present invention to 15/1000 m ² or less.

  The thickness of the handsheet is preferably 0.01 to 2 mm, more preferably 0.05 to 1 mm, and still more preferably 0.1 to 0.5 mm.

The basis weight of the handsheets is preferably 20 to 80 g / ^{m 2,} more preferably from 25~70g / ^{m 2,} and still more preferably from a 30 to 60 g / ^{m 2.}

 Wood pulp usable in the present invention includes softwood bleached kraft pulp (NBKP), hardwood bleached kraft pulp (LBKP), softwood bleached sulfite pulp (NBSP), hardwood bleached sulfite pulp (LBSP), and thermomechanical pulp (TMP). These are wood pulps such as single or mixed. Softwood bleached kraft pulp (NBKP) and softwood bleached sulfite pulp (NBSP) are preferred. This wood pulp is the main component, non-wood pulp such as hemp, bamboo, cocoon, kenaf, cocoon, cocoon, cotton etc., modified pulp such as cationized pulp, mercerized pulp, rayon, vinylon, nylon, etc. Synthetic fibers such as acrylic and polyester, chemical fibers, or microfibrillated pulp can be used alone or in combination. However, if the pulp contains a large amount of resin, the resin may contaminate the glass plate surface. Therefore, chemical pulp with as little resin as possible, for example, softwood bleached kraft pulp, is used alone. It is preferable to do. Also, high yield pulp such as groundwood pulp is not preferred because it contains a large amount of resin. In addition, mixing synthetic fibers and chemical fibers improves cutting performance and improves workability when making interleaf paper flat, but care must be taken because recyclability deteriorates in terms of waste disposal. is there.

 In addition, in the range not impairing the performance of the present invention, for the papermaking fiber mainly composed of the above-described wood pulp, if necessary, an adhesive, an antifungal agent, various papermaking fillers, a wet paper strength enhancer, Add dry paper strength enhancer, sizing agent, colorant, fixing agent, yield improver, slime control agent, etc., then known and existing long net paper machine, circular net paper machine, short net paper machine, long net It can be obtained by paper making with a circular net combination paper machine. In addition, when adding these chemicals, extreme caution is required so that insects and dust do not enter.

 When the wood pulp for the glass board interleaving paper of the present invention is produced, the effect of increasing the paper interlayer strength can be expected by beating the wood pulp. However, if the fine fibers in the wood pulp increase as the beating progresses, paper dust may be generated during use as a slip sheet, so it is not preferable to advance the beating degree more than necessary. Therefore, a preferable beating degree in the present invention is 300 to 650 mlc. s. f. It is.

  By using the above-described wood pulp, the glass sheet slip sheet of the present invention can be obtained by a usual method. Note that calendering, super calendering, soft nip calendering, embossing, and the like may be performed during and / or after production of the glass sheet interleaf. Surface properties and thickness can be adjusted by processing.

  The thickness of the interleaf paper for glass plate of the present invention is preferably 0.01 to 2 mm, more preferably 0.05 to 1 mm, and still more preferably 0.1 to 0.5 mm.

The basis weight of the glass plate for inserting paper of the present invention is preferably 20 to 80 g / ^{m 2,} more preferably from 25~70g / ^{m 2,} still to be 30 to 60 g / ^{m 2} from preferable.

  The glass plate interleaving paper of the present invention is used by being inserted between glass plates. For example, the glass sheet interleaving paper is typically inserted one by one between a plurality of glass sheets to form a laminated body as a whole, and the laminated body is a target for storage and transportation. Moreover, you may package a glass plate single-piece | unit or the said laminated body using the glass plate interleaf of this invention. In this way, the glass plate interleaf of the present invention can be inserted between a plurality of glass plates to protect the glass plate.

  Although it does not specifically limit as a glass plate, It is preferable that it is a glass plate for flat panel displays, such as a plasma display panel, a liquid crystal display panel (especially TFT liquid crystal display panel), and an organic electroluminescent display panel. Fine electrodes, partition walls, etc. are formed on the surface of the glass plate for flat panel display, but transfer of hydrophobic substances such as silicone to the glass plate is possible by using the glass plate interleaf of the present invention. Since it is suppressed or avoided, inconvenience due to silicone can be suppressed or avoided even if fine electrodes, partition walls, etc. are formed on the surface of the glass plate, and as a result, display defects can be suppressed or avoided. it can.

  In particular, as the size of the display increases, the size and weight of the glass plate for flat panel displays has increased, but the glass plate interleaf of the present invention has a good surface for such a large or heavy glass plate. Can be protected. In particular, the glass sheet interleaving paper of the present invention can extremely reduce the number of dispersed hydrophobic substances such as silicone, so that the hydrophobic substance such as silicone is transferred to the glass plate even when pressed by a large glass sheet. This can be suppressed or avoided. Therefore, the glass plate interleaving paper of the present invention can be suitably used for a glass plate for a flat panel display where surface cleanliness is particularly required.

  The present invention also relates to a method for producing a glass sheet slip sheet. The method for producing a glass sheet slip sheet according to the present invention applies a colorant or a colorant to a glass sheet slip sheet in order to detect a non-colored or non-coloring discontinuous region present on the surface of the glass sheet slip sheet. The process of carrying out is included.

  As described above, the application of the colorant or the color former can be carried out, for example, by applying a composition such as a solution or a dispersion containing the colorant or the color former on the glass sheet. Alternatively, the glass sheet interleaving paper may be immersed in a composition such as a solution or a dispersion containing a colorant or a color former. It is preferable to apply an aqueous solution of an aqueous dye to a glass sheet interleaf. It is preferable to dry the glass sheet interleaf after the application or immersion. The concentration of the colorant or color former in the composition is not particularly limited, but is preferably 0.001 to 20% by weight, more preferably 0.01 to 10% by weight, and 0.1 to 1% by weight. Is even more preferred.

  The method for producing a glass sheet slip sheet of the present invention can easily provide a glass sheet slip sheet capable of visually confirming the presence of a hydrophobic substance such as silicone present on the surface.

  EXAMPLES Hereinafter, although this invention is demonstrated more concretely using an Example and a comparative example, the scope of the present invention is not limited to an Example.

[Example 1]
In a conifer bleached kraft pulp manufacturing apparatus consisting of a cooking process, a washing process, an oxygen delignification reaction process, and a multistage bleaching bleaching process with chlorine dioxide and hydrogen peroxide, An appropriate amount of a stock solution of a mineral oil-based antifoaming agent “Pronal A5044” (manufactured by Toho Chemical Co., Ltd.), which is a non-silicone-based antifoaming agent, was continuously added as an antifoaming agent used in the cleaning liquid. Similarly, an appropriate amount of “Pronal A5044” was added as an antifoaming agent added to the wash press in the press washing step. In the washing step, washing with a mixed solvent of toluene and methanol and washing with solvent were repeated five times. As mentioned above, the softwood bleached kraft pulp A which used the non-silicone type | system | group antifoamer in the manufacturing process was obtained. Dissolve 100 parts by mass of this softwood bleached kraft pulp A to give a beating degree of 520 mlc. s. f. 0.5 parts by weight of polyacrylamide (trade name: Polystron 1250, manufactured by Arakawa Chemical Industries, Ltd.) as a paper strength enhancer was added to the prepared slurry, and a pulp slurry having a concentration of 0.4% by weight. Was prepared. This paper is made using a long paper machine, and a 1% by weight aqueous solution of the cationic direct dye “Levacel First Black G” (Blanco For Japan Co., Ltd.) is applied to the paper surface by a size press during the paper making process. Thus, a glass plate interleaving paper having a basis weight of 50 g / m ² was obtained. A non-colored discontinuous region derived from a hydrophobic substance on the surface of the glass plate interleaf paper could be visually confirmed. The existence ratio of non-colored discontinuous regions was 4/1000 m ² .

[Comparative Example 1]
In the process of producing the softwood bleached kraft pulp of Example 1, a silicone-based antifoaming agent “SN Deformer 551K” (manufactured by San Nopco) is used as an antifoaming agent, and the same as above except that the solvent washing is not performed. As a result, softwood bleached kraft pulp B was obtained. A glass plate interleaving paper having a basis weight of 50 g / m ² was obtained in the same manner as in Example 1 except that 100 parts by mass of this softwood bleached kraft pulp B was used and dyeing by size press was omitted. The presence of a hydrophobic substance on the surface of the glass plate interleaf paper could not be confirmed visually.

Claims (15)

It is a slip sheet for glass plate made from wood pulp,
A slip sheet for glass plate in which a colorant or color former is applied to the surface.   The slip sheet for glass plates according to claim 1, wherein the colorant is an aqueous dye.   The paper for glass plates according to claim 1, wherein the colorant is a pigment.   The slip sheet for glass plates according to claim 1, wherein the color former develops color upon irradiation with electromagnetic waves.   The slip sheet for a glass plate according to any one of claims 1 to 4, wherein the colorant or color former is applied for detection of a non-colored or non-colorable discontinuous region present on the surface. 6. The interleaving paper for glass plate according to claim 5, wherein the non-colored or non-coloring discontinuous regions having a minimum diameter of 30 μm or more present on the surface are 15/1000 m ² or less.   The slip sheet for glass plates according to any one of claims 1 to 6, wherein the discontinuous region contains a hydrophobic substance.   The slip sheet for glass plates according to claim 7, wherein the hydrophobic substance contains silicone.   The slip sheet for glass plate according to claim 8, wherein the silicone is silicone oil.   The slip sheet for glass plates according to claim 9, wherein the silicone oil is dimethylpolysiloxane.   The glass sheet slip sheet according to any one of claims 1 to 10, wherein the glass sheet is used for a display.   The slip sheet for glass plates according to claim 11, wherein the display is a TFT liquid crystal display or an organic EL display.   The laminated body which consists of the paper for glass plates in any one of Claims 1 thru | or 12, and a glass plate.   The protection method of a glass plate including the process of inserting the interleaving paper for glass plates in any one of Claims 1 thru | or 12 between several glass plates. A method for producing a glass sheet interleaving paper made of wood pulp,
A production method comprising a step of applying a colorant or a color former to a glass sheet interleaving paper for detection of a non-colored or non-coloring discontinuous region present on the surface of the glass sheet interleaving paper.