JP2016125146A - Wood pulp for glass plate inserting paper, and glass plate inserting paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide inserting paper for a glass plate which is used as a substrate material for a flat panel display which requires high cleanness and scratch purity, capable of reducing contamination on a surface of the glass to a level in which there is no problem actually, and a wood pulp for the inserting paper.SOLUTION: The invention relates to a wood pulp for glass plate inserting paper, in which, a ratio of talc existing on a surface of hand-made paper which is made by a method according to JIS P 8222, is 10 pieces/100 mor lower, and the glass plate inserting paper which is formed of a wood pulp as a raw material, in which, a ratio of talc existing on a surface is 3 pieces/100 mor lower.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 paper sandwiched between glass plates and wood pulp used in the production of 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. Patent Document 5 proposes the use of cellulose pulp having specific physical properties as a raw material for glass interleaving paper.

  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 6 describes that the amount of silicone contained in the slip sheet for glass plate is limited.

JP 2012-188785 A JP 2010-242057 A JP 2008-208478 A JP 2006-44674 A JP 2007-131965 A International Publication No. 2014/104187

  However, it may be difficult to reduce the contamination of the glass plate surface derived from silicone to a practically no problem level only by limiting the total amount of silicone contained in the glass plate interleaving paper.

  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. An object of the present invention is to provide a slip sheet and wood pulp for 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.

  Accordingly, the total amount of hydrophobic substances in the wood pulp used for the production of glass sheet interleaf (hereinafter also referred to as “glass sheet interleaf”) should be kept below a certain level, and the glass sheet interleaf It is conceivable that the total amount of the hydrophobic substance 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.

  Therefore, as a result of further intensive studies, the present inventors have found that a hydrophobic substance that appears on the surface of the glass sheet interleaf or contained in the wood pulp used for the production of the glass sheet interleaving paper can be a problem. We found for the first time that it can be combined with talc. And the present inventors finally reduced the amount of talc that appears on the surface of the glass sheet interleaf or contained in the wood pulp used for the production of the glass sheet interleaving paper, and finally the glass sheet The present inventors have found that the above-mentioned problems can be solved by reducing the hydrophobic substances that appear on the surface of the interleaving paper, which can be problematic.

  In the first place, talc is widely used in order to detack sticky substances such as pitch contained in wood during the production of wood pulp and to prevent troubles caused by the sticky substance in the papermaking process. In addition, when used paper is used as a raw material for paper, it is widely used for detackifying adhesive materials such as resin in the used paper.

  Up to now, talc has been actively applied to the slip sheets for glass plates used as substrate materials for flat panel displays, which require high cleanliness and scratch quality, in order to eliminate adhesive substances that can cause problems. It was thought that it should be blended. For example, in Patent Document 5 (Japanese Patent Application Laid-Open No. 2007-131965) (see [0009], [0017], [0032], etc.), an adhesive substance contained in a glass sheet interleaf should be detackified with talc. This is disclosed.

  Therefore, rather than actively using talc, contamination of the glass surface for glass plates used as substrate materials for flat panel displays that require high cleanliness and scratch quality is a practical problem. It is a surprising finding that the level can be reduced to a level that is not, and the technical significance of the present invention based on the finding is remarkable in the technical field.

  In the present invention, by limiting the ratio of talc present, the ratio of the hydrophobic substance that can be a problem is reduced, and the contamination of the glass plate surface derived from the hydrophobic substance is practically not problematic. Can be reduced.

The first aspect of the present invention is wood pulp for glass board interleaving paper, and the ratio of talc present on the surface of handsheets prepared by a method according to JIS P 8222 using the wood pulp is 10 pieces. It is related with the wood pulp for glass board plywood which is / 100m < ² > or less.

  The average particle size of the talc is preferably 1 to 10 μm.

  The talc may be complexed with a hydrophobic substance. In the form in which the talc and the hydrophobic substance are combined, the average particle size is preferably 30 μm or more. 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.

A second aspect of the present invention relates to a glass sheet slip sheet made from wood pulp, and the ratio of talc present on the surface is 3 pieces / 100 m ² or less.

  The average particle size of the talc is preferably 1 to 10 μm.

  The talc may be complexed with a hydrophobic substance. In the form in which the talc and the hydrophobic substance are combined, the average particle size is preferably 30 μm or more. 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.

  Further, the present invention provides a glass plate interleaf made of the wood pulp of the first aspect of the present invention and / or the glass sheet interleaf of the second aspect of the present invention, and a laminate with the glass plate. Also related to things.

  Furthermore, the present invention also relates to the use of the wood pulp of the first aspect of the invention for the production of glass board interleaving paper, in particular the glass board interleaving paper of the second aspect of the invention.

  In the present invention, by reducing the amount of talc that can be combined with a hydrophobic substance such as silicone, the hydrophobic substance is combined with talc and grows to a level that can cause a problem. Therefore, it is possible to avoid or reduce contamination of the surface of a glass plate used as a substrate material for flat panel displays.

  The glass plate interleaf made of wood pulp of the present invention and the glass plate interleaf of the present invention can suppress or avoid transfer of hydrophobic substances such as silicone to the glass plate. 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.

  In the present invention, the total amount of the hydrophobic substance in the wood pulp used for the production of the glass sheet interleaf, or the total amount of the hydrophobic substance in the glass sheet interleaf, not less than a certain amount, Hydrophobic substances that can be transferred to the glass plate because the number of talc that can be present in the wood pulp or locally on the surface of the slip sheet for glass plates and that can constitute a problematic hydrophobic material is kept below a certain level. These spots can be controlled at an individual level, and the contamination of the glass plate surface derived from the hydrophobic substance can be reduced to a practically no problem level.

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 talc present on the surface exceeds 10/100 m ² If a slip sheet made of wood pulp that can be prepared, or a slip sheet with a talc number of more than 3/100 m ² on the surface is used for the glass plate, there is a hydrophobic substance that can be transferred to the glass plate. As a result, it causes a problem in forming the panel.

Therefore, the wood pulp for glass board interleaving paper of the present invention has a talc existing ratio of 10 pieces / 100 m ² or less on the surface of the handsheet prepared by the method according to JIS P 8222 using the wood pulp. is there. Moreover, the interleaving paper for glass plates of the present invention is interleaving paper for glass made of wood pulp, and the ratio of talc present on the surface is 3/100 m ² or less. As a result, the number of regions that can be a substantial problem of hydrophobic substances such as silicone existing on the surface of the glass board interleaf paper made of the wood pulp of the present invention or the glass interleaf paper of the present invention is reduced to a problem-free level. can do.

The number of talc present on the surface of the handsheet is preferably 8 pieces / 100 m ² or less, more preferably 6 pieces / 100 m ² or less, and even more preferably 4 pieces / 100 m ² or less. preferably, it is preferred even more that two / 100m ² or less, preferably more than that one / 100m ² or less, and particularly preferably 0.5 or / ^{m 2} or less.

Preferably talc number present on the surface of the glass plate for slip sheet is two / 100m ² or less, more preferably 1 / 100m ² or less, 0.8 or / 100m ² or less More preferably, it is still more preferably 0.6 pieces / 100 m ² or less, still more preferably 0.4 pieces / 100 m ² or less, and 0.2 pieces / 100 m ² or less. Is particularly preferred.

  By the way, an organic substance that can be extracted from pulp with an organic solvent is referred to as “pitch”. The pitch is mainly composed of fatty acids such as palmitic acid and stearic acid, and resin acids such as abietic acid and pimaric acid, and also includes other ester compounds. In the case of waste paper pulp, there are components derived from sizing agents, hot melt resins, inks, and the like. If these pitches are included in the paper, it may cause inconveniences in the paper break or the like. The pitch control agent has a function of suppressing the pitch. For example, it reduces the adhesiveness of the pitch, prevents its aggregation and growth, and allows the pitch to stay in the paper in a harmless manner.

  That is, the pitch control agent is an additive used for detackifying an adhesive substance such as pitch in the papermaking process. The pitch control agent is also used, for example, to suppress a pitch adhesion trouble during a papermaking process caused by a resin component (pitch) contained in wood or used paper as a raw material of paper. In the pulp manufacturing process, the pitch control agent is used in an unbleached cleaning process, a bleaching process, a selective process, a deinking process, and the like.

  Since talc is relatively inexpensive, it is widely used as a pitch control agent. In addition, talc is used not only as a pitch control agent but also as a filler and a pigment for paper coating, and exhibits the effect of improving the whiteness of paper and improving printing characteristics.

The talc in the present invention is not particularly limited. Talc is called “hydrous magnesium silicate”, and the chemical formula can be represented by 4SiO ₂ .3MgO.H ₂ O. The chemical composition differs somewhat depending on the place of production, and the theoretical values are weight ratios of SiO ₂ 64.4%, MgO 31.8%, ignition loss (water) 4.7%. Talc is also called talc.

  Talc has a relatively lipophilic surface and can be combined with a hydrophobic substance by adsorbing a hydrophobic substance such as silicone in the pulp slurry. Therefore, even if talc is in water, it can adsorb hydrophobic substances such as silicone and reduce its adhesiveness. The form of complexing talc with a hydrophobic substance, particularly silicone, is not particularly limited, but at least a part of talc may be covered with a hydrophobic substance, or at least a part of talc is covered with a hydrophobic substance. It may penetrate.

  The average particle diameter of the talc is not particularly limited, but is preferably 1 to 10 μm, more preferably 1 to 8 μm, still more preferably 1 to 6 μm, and particularly preferably 1 to 4 μm. The average particle diameter may be a volume average particle diameter and can be measured, for example, by a laser diffraction / scattering method.

The surface area of the talc is not particularly limited, but the specific surface area by the BET method is preferably 1 m ² / g or more, more preferably 10 m ² / g or more, and still more preferably 20 m ² / g or more.

  The density of the talc is not particularly limited, but the apparent density based on JIS K5101 is preferably 1 g / ml or less, more preferably 0.8 g / ml or less, still more preferably 0.6 g / ml or less, and even more preferably 0.4 g / ml. Even more preferably, it is even more preferably 0.2 g / ml or less.

The ratio of talc present on the surface of the handsheet prepared by the method according to JIS P 8222 using the wood for the glass sheet interleaf of the present invention is 10/100 m ² or less, and the glass plate of the present invention There is no particular limitation on the means for setting the ratio of talc present on the surface of the interleaving paper to 3 pieces / 100 m ² or less, but other than talc is used as the pitch control agent used in the papermaking process. It is preferable to do.

  Examples of non-talc pitch control agents include surfactants, cationic polymers, and sulfuric acid bands.

  As the surfactant, various anionic, cationic, amphoteric and nonionic surfactants can be used. Nonionic surfactants such as polyoxyethylene alkyl ether and polyoxyethylene alkylphenyl ether Anionic surfactants such as sodium dialkylsulfosuccinate and sodium alkylbenzenesulfonate are preferred.

で表される単位を含むジアリル第４級アンモニウムポリマー、下記一般式（２）：

で表される単位を含むキトサン、下記一般式（３）：

（式中、Ｒ_１は水素原子又はメチル基を表し；Ｒ_２及びＲ_３はそれぞれ独立してＣ_１−４アルキル基を表す）で表される単位又はその第４級塩（塩酸塩、硫酸塩等）の形態を含む、ジアルキルアミノ（メタ）アクリレート系ポリマー、下記一般式（４）：

（式中、Ｒ_１及びＲ_２はそれぞれ独立して水素原子又はＣ_１−４アルキル基を表す）で表される単位を含むエピクロルヒドリンアルキルアミン付加型ポリマー、下記一般式（５）：

で表される単位を含むビニルイミダゾリン系ポリマー等が挙げられる。 Various types of cationic polymers can be used. For example, the following general formula (1):

A diallyl quaternary ammonium polymer containing a unit represented by the following general formula (2):

Chitosan containing a unit represented by the following general formula (3):

(Wherein R ₁ represents a hydrogen atom or a methyl group; R ₂ and R ₃ each independently represents a C _1-4 alkyl group) or a quaternary salt thereof (hydrochloride, sulfuric acid) Dialkylamino (meth) acrylate-based polymers including the form of salts and the like, the following general formula (4):

(Wherein R ₁ and R ₂ each independently represents a hydrogen atom or a C _1-4 alkyl group), an epichlorohydrin alkylamine addition-type polymer containing a unit represented by the following general formula (5):

And vinyl imidazoline polymers containing units represented by the formula:

  The form of the region of the hydrophobic substance such as silicone existing on the surface of the glass board interleaf made of the wood pulp of the present invention is arbitrary, and may be various shapes such as a circle, an ellipse, a square, etc. Or it is preferable that it is elliptical.

The wood pulp for glass board interleaving paper of the present invention has 50/1000 m hydrophobic substance regions having a minimum diameter of 30 μm or more present on the surface of handsheet prepared by the method according to JIS P 8222 using the wood pulp. It is preferable to have a quality of ² or less. In addition, the glass sheet interleaf of the present invention is a glass interleaf made of wood pulp, and the number of hydrophobic substance regions having a minimum diameter of 30 μm or more present on the surface is preferably 15/1000 m ² or less.

The number of the hydrophobic substance regions of the handsheet is preferably 30 pieces / 1000 m ² or less, more preferably 20 pieces / 1000 m ² or less, and even more preferably 10 pieces / 1000 m ² or less. More preferably, 5 pieces / 1000 m ² or less, still more preferably 3 pieces / 1000 m ² or less, and particularly preferably 1 piece / 1000 m ² or less. The number of the hydrophobic substance regions is preferably 10 pieces / 10 kg or less, more preferably 6 pieces / 10 kg or less, and more preferably 4 pieces / 10 kg or less per weight of the wood pulp for glass board interleaving paper. Is more preferably 3/10 kg or less, even more preferably 2/10 kg or less, and particularly preferably 1/10 kg or less. The weight here refers to the weight of the air-dried pulp.

The number of the hydrophobic substance regions in the glass sheet interleaf is preferably 12 pieces / 1000 m ² or less, more preferably 10 pieces / 1000 m ² or less, and 8 pieces / 1000 m ² or less. Further more preferably, 5 pieces / 1000 m ² or less, still more preferably 3 pieces / 1000 m ² or less, and particularly preferably 1 piece / 1000 m ² or less. Further, the number of the hydrophobic substance regions is preferably 4/10 kg or less, more preferably 3/10 kg or less, and more preferably 2/10 kg or less per weight of the glass sheet interleaf. Is 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. The weight here refers to the weight of the slip sheet containing 10% by weight of moisture.

  The minimum diameter of the hydrophobic substance region is preferably 25 μm or more, more preferably 20 μm or more, even 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. 5 μm or more is particularly preferable. For example, when the hydrophobic substance 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, still more preferably 5 μm or more, and even more preferably 1 μm or more. Is more preferable, and 0.5 μm or more is particularly preferable. When the hydrophobic substance region is non-circular or non-elliptical, the equivalent circle diameter is preferably 25 μm or more, preferably 20 μm or more, more preferably 15 μm or more, still more preferably 10 μm or more, and further preferably 5 μm or more. 1 μm or more is even more preferable, and 0.55 m or more is particularly preferable.

  The maximum diameter of the hydrophobic substance 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, still more preferably 100 μm or less, and even more preferably 50 μm or less. Is particularly preferred. For example, when the hydrophobic substance 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, still more preferably 1 mm or less, and more preferably 500 μm or less. Even more preferred is 100 μm or less, even more preferred is 50 μm or less. When the hydrophobic substance 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, still more preferably 1 mm or less, and further preferably 500 μm or less. More preferably, 100 μm or less, even more preferably 50 μm or less.

  It is preferable that a hydrophobic substance region having a maximum diameter of more than 10 mm does not exist on the surfaces of the wood pulp for glass plate interleaving paper of the present invention and the glass sheet interleaving paper of the present invention.

  The hydrophobic substance is not particularly limited. 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).

  In the present invention, it is preferable that the amount of silicone contained in the wood pulp, and hence the glass board interleaf made of the wood pulp, is 0.5 ppm or less with respect to the absolute dry mass of the wood pulp or interleaf. More preferably, it is 0.4 ppm or less, still more preferably 0.3 ppm or less, still 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 reduce the hydrophobic substance area having a minimum diameter of 30 μm or more present on the surface of the interleaf paper for glass plate of the present invention to 15/1000 m ² or less, wood pulp as a raw material for interleaf is particularly rich in silicone. It is important not to include it. In the first aspect of the present invention, the means for reducing the silicone content in the wood pulp used as the raw material for the slip paper is not particularly limited, but the non-silicone type is used as an antifoaming agent used in the production of the wood pulp. It is preferable to use an antifoaming agent.

  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 for glass board interleaving paper of the present invention is a glass board in which the ratio of talc present on the surface of handsheets prepared by a method according to JIS P 8222 using the wood pulp is 10 pieces / 100 m ² or less. Wood pulp for interleaving paper. Thereby, for example, 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 board interleaf made of the wood pulp of the present invention can be set to 15/1000 m ² or less, for example. .

 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. 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 interleaving paper into a lithographic plate. However, care must be taken because recyclability deteriorates in terms of waste disposal. .

 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 of the present invention is produced, if the beating of the wood pulp is advanced, an effect of increasing the paper interlayer strength can be expected. 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.

  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.}

  By using the wood pulp of the present invention, a glass plate interleaving paper, particularly the glass plate interleaving paper of the present invention, can be obtained by an ordinary 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 glass interleaving paper preferably has a thickness of 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.

In the slip sheet for glass plate of the present invention, the ratio of talc present on the surface is 3 pieces / 100 m ² or less. Thereby, the glass board interleaf of this invention can make the number of area | regions 30 micrometers or more of minimum diameters of hydrophobic substances, such as silicone which exist in the surface, into 15 pieces / 1000m < ² > or less, for example.

  The interleaving paper obtained from the wood pulp of the present invention, particularly the glass plate interleaving paper of the present invention, is used by being inserted between the 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 slip paper which consists of the wood pulp of this invention, especially the glass plate slip paper of this invention.

  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 by using the glass plate interleaf made of the wood pulp of the present invention, particularly the glass plate interleaf of the present invention. Since the transfer of hydrophobic substances such as silicone to the glass plate is suppressed or avoided, even if fine electrodes, partition walls, etc. are formed on the surface of the glass plate, it is possible to suppress or avoid problems caused by silicone, As a result, display defects can be suppressed or avoided.

  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 made of the wood pulp of the present invention, particularly the glass plate interleaf of the present invention, The surface of such a large or heavy glass plate can be well protected. In particular, the glass board interleaf made of the wood pulp of the present invention, particularly the glass board interleaf of the present invention, has a very small number of scattered hydrophobic substances such as silicone. It is possible to suppress or avoid transfer of a hydrophobic substance such as a glass plate to a glass plate. Therefore, the glass plate interleaf made of the wood pulp of the present invention, particularly the glass plate interleaf of the present invention, can be suitably used for a glass plate for a flat panel display in which surface cleanliness is particularly required.

  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.

[Transfer test method to glass plate (transport test)]
Aluminum foam is placed on the glass mounting surface on the L-shaped gantry at an angle of 75 degrees, and the mounting surface for mounting the glass plate vertically, and the rear end of the mounting surface Insert 120 sheets of glass plate of size 680mm x 880mm x 0.7mm and each glass plate into the backrest surface extending in the vertical direction, and lean it so that it is parallel to the backrest surface and fix it to the gantry The belt-shaped belt thus formed was stretched over the entire circumference from the rear end portion to the backrest surface, and the glass plate was fixed. The gantry set as described above was entirely covered with a packaging material in order to prevent dust and dirt from entering from the outside. After that, a truck transportation test was conducted. The transportation test was conducted at a transportation distance of 1000 km (stored for 5 days in an environment of 40 ° C. × 95% RH during transportation).

[Example 1] (Production of wood pulp)
Interface as a pitch control agent used during washing process in conifer bleached kraft pulp manufacturing equipment consisting of cooking process, washing process, oxygen delignification reaction process, and multi-stage bleaching bleaching process with chlorine dioxide and hydrogen peroxide The active agent “Miracle Pichicon 500” (manufactured by Katayama Narco) was used. As mentioned above, the softwood bleached kraft pulp A which used the non-talc pitch control agent in the pulp manufacturing process was obtained. Handsheets were produced by a method based on JIS P 8222 using this softwood bleached kraft pulp A as a raw material. When this handsheet was analyzed with a microscope, the ratio of talc present on the surface of the handsheet was 2/100 m ² .

[Comparative Example 1] (Manufacture of wood pulp)
Moreover, the softwood bleached kraft pulp B was obtained like Example 1 except having used the talc type | system | group antifoamer "MISSTRON VAPOR" (made by Nippon Mystron) as a pitch control agent. Handsheets were produced by a method based on JIS P 8222 using this softwood bleached kraft pulp B as a raw material. As a result of microscopic analysis of the handsheet, the ratio of talc present on the surface of the handsheet was 12/100 m ² .

[Example 2] (Production of glass interleaving paper)
100 parts by weight of softwood bleached kraft pulp A was prepared as a wood pulp, and this was disaggregated to give a beating degree of 520 mlc. s. f. 0.4 parts by mass 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 0.4% concentration pulp slurry was added. Prepared. Using this, a paper web for glass plate having a basis weight of 50 g / m ² was obtained using a long paper machine. When this glass board interleaving paper was microscopically analyzed, the ratio of talc existing on the surface of the interleaving paper for glass was 1 piece / 100 m ² .

[Comparative Example 2] (Production of glass interleaving paper)
A glass sheet interleaf having a basis weight of 50 g / m ² was obtained in the same manner as in Example 2 except that softwood bleached kraft pulp B was used as the wood pulp. When this glass board interleaving paper was microscopically analyzed, the ratio of talc present on the surface of the interleaving paper for glass was 4/100 m ² .

  When the transfer of the glass plate interleaving paper obtained in Example 2 and Comparative Example 2 to the glass plate was confirmed by a transportation test, an array of a liquid crystal panel using the glass plate using the interleaving paper of Example 2 was formed. No disconnection of the color film was observed. On the other hand, when forming an array of a liquid crystal panel using a glass plate using the interleaving paper of Comparative Example 2, disconnection of the color film was observed.

Claims (21)

Wood pulp for glass board interleaving paper,
Wood pulp for glass board plywood in which the ratio of talc present on the surface of handsheet prepared by the method according to JIS P 8222 using the wood pulp is 10 pieces / 100 m ² or less.   The wood pulp for glass board plywood according to claim 1, wherein the talc has an average particle size of 1 to 10 µm.   The wood pulp for glass board plywood according to claim 1 or 2, wherein the talc is combined with a hydrophobic substance.   The wood pulp for glass board plywood according to claim 3, wherein an average particle diameter of the composite form of the talc and the hydrophobic substance is 30 µm or more.   The wood pulp for glass board plywood according to claim 3 or 4, wherein the hydrophobic substance contains silicone.   The wood pulp for glass board plywood according to claim 5, wherein the silicone is silicone oil.   The wood pulp for glass board plywood according to claim 6, wherein the silicone oil is dimethylpolysiloxane.   The wood pulp for glass plate interleaving paper according to any one of claims 1 to 7, wherein the glass plate is for display.   The wood pulp for glass board interleaving paper according to claim 8, wherein the display is a TFT liquid crystal display or an organic EL display.   The glass board interleaving paper which consists of the wood pulp for glass board interleaving paper in any one of Claims 1 thru | or 9.   Use of the wood pulp according to any one of claims 1 to 9 for the production of glass board interleaving paper. It is a slip sheet for glass plate made from wood pulp,
Interleaving paper for glass plate in which the ratio of talc present on the surface is 3 pieces / 100 m ² or less.   The slip sheet for glass plates of Claim 12 whose average particle diameter of the said talc is 1-10 micrometers.   14. The glass sheet interleaf paper according to claim 12 or 13, wherein the talc is combined with a hydrophobic substance.   The interleaf paper for glass plates according to claim 14, wherein an average particle diameter of the composite form of the talc and the hydrophobic substance is 30 µm or more.   The glass sheet slip sheet according to claim 14 or 15, wherein the hydrophobic substance contains silicone.   The slip sheet for glass plate according to claim 16, wherein the silicone is silicone oil.   The glass sheet interleaf according to claim 17, wherein the silicone oil is dimethylpolysiloxane.   The slip sheet for a glass plate according to any one of claims 12 to 18, wherein the glass plate is used for a display.   The glass sheet interleaving paper according to claim 19, 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 12 thru | or 20, and a glass plate.