Pulp for glass interleaving paper and glass interleaving paper

Abstract

To provide a pulp for a glass interleaving paper with reduced generation of aggregates containing a silicone oil as the main constituent and that can be manufactured while suppressing foam formation in a pulp manufacturing step, and a glass interleaving paper wherein contamination of a surface of a glass substrate due to aggregates containing a silicone oil as the main constituent is reduced.SOLUTION: A pulp for a glass interleaving paper contains a silicone-based antifoamer containing a hydrophilic modified silicone oil. A glass interleaving paper uses the pulp for glass interleaving paper as the main component and has a basis weight of 10-100 g / m2.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to pulp for glass interleaving paper and glass interleaving paper. [Background technology]

[0002] As glass substrates become more versatile, the quality requirements for glass interleaving paper are becoming stricter. For example, glass substrates used in flat panel displays such as liquid crystal displays, organic electroluminescent displays, touch panels, and plasma displays have fine electronic components formed on the surface of the glass substrate, and even slight scratches or contamination on the surface can cause defects such as broken wires, resulting in product defects. Therefore, a high level of clarity is required for the glass substrate surface. In particular, extremely high clarity is required for the glass substrate surface used in liquid crystal displays for TFTs and color filters, and organic electroluminescent displays.

[0003] To improve the efficiency of glass substrate transport, glass substrates are often stacked and transported using glass interleaving paper. When glass substrates are stacked, their weight increases the contact pressure between the glass interleaving paper and the glass substrates, increasing the likelihood that trace components or foreign matter in the glass interleaving paper will cause defects in the glass substrates. Meanwhile, as glass substrates are processed with high precision, higher levels of clarity are required for the glass substrate surface. Due to these circumstances, the quality requirements for glass interleaving paper are becoming increasingly stringent.

[0004] Foreign matter and contaminants generated during the raw pulp manufacturing process and during the process of making glass interleaving paper from raw pulp often end up in the glass interleaving paper. These foreign matter and contaminants are transferred (contaminated) to the surface of the glass substrate during storage or transportation, causing defects in the glass substrate.

[0005] Glass substrates, particularly those used for flat panel displays, undergo a process of cleaning the surface of the glass substrate using a water-based medium before shipping or before mounting electronic components, etc. This process washes away most of the foreign matter, such as paper dust, adhering to the surface of the glass substrate, but some foreign matter and contaminants may still adhere to the surface of the glass substrate after cleaning.

[0006] These foreign matter and contaminants include organic, water-insoluble substances derived from natural resins, gums, and additives liberated from wood, pulp, and paper. Silicone oil, contained in the defoaming agent used in pulp production, has a strong affinity with glass and is difficult to remove even when cleaning the glass substrate with a brush or cleaning solution, generating hydrophobic aggregates on the glass substrate surface. This can result in problems such as broken wires during the assembly process of electronic components.

[0007] Therefore, for example, Patent Document 1 discloses the use of wood pulp for glass plate interleaving in which the silicone content in the wood pulp is 0.5 ppm or less based on the bone dry mass of the pulp. Also, Patent Document 2 discloses that the wood pulp for glass plate interleaving is a wood pulp for glass plate interleaving, and that when a handmade paper is prepared using the wood pulp in accordance with JIS P 8222, the number of discontinuous regions on the surface of the handmade paper in which the fluorescent X-ray intensity of silicon is 1 cps or more is 50 / 1000 m. 2 The following wood pulp for glass plate interleaving is disclosed. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] International Publication No. 2014 / 104187 [Patent Document 2] Japanese Patent Application Laid-Open No. 2016-98468 Summary of the Invention [Problem to be solved by the invention]

[0009] In Patent Document 1, when the silicone content in the pulp is to be 0.5 ppm or less, the addition rate of the antifoaming agent must be reduced, which may result in insufficient measures against foaming in the pulp production process.To obtain the pulp described in Patent Document 2, it is necessary to repeat solvent washing in a washing process, which involves washing with a solvent mixture of toluene and methanol and filtering, which requires the installation of solvent-compatible equipment on a regular pulp production line, which is costly and time-consuming.

[0010] The present invention has been made in view of the above-mentioned circumstances. That is, an object of the present invention is to provide a pulp for glass interleaving paper that can be produced by suppressing foaming in the pulp production process and that reduces the generation of agglomerates mainly composed of silicone oil. Another object of the present invention is to provide a glass interleaving paper that reduces contamination of the glass substrate surface caused by agglomerates mainly composed of silicone oil. [Means for solving the problem]

[0011] The inventors have studied defoaming agents that are added to suppress foaming in the pulp manufacturing process. As a result, they have found that by using a specific type of defoaming agent, it is possible to simultaneously suppress foaming in the pulp manufacturing process and reduce contamination of the glass substrate surface caused by silicone oil aggregates, and have thus invented the present invention. That is, the present invention has the following configuration.

[0012] (1) Pulp for glass interleaving paper, characterized by containing a silicone-based defoaming agent containing hydrophilic modified silicone oil.

[0013] (2) The pulp for glass interleaving paper according to (1) above, characterized in that the content of talc added as a pitch control agent is less than 0.1% by mass.

[0014] (3) A glass interleaving paper having a basis weight of 10 to 100 g / m2, the main component of which is the pulp for glass interleaving paper according to (1) or (2). 2A glass interleaving paper characterized by:

[0015] (4) The glass interleaving paper according to (2) above, characterized in that the content of talc added as a pitch control agent is less than 0.1% by mass. [Effects of the Invention]

[0016] The pulp for glass interleaving paper of the present invention can be produced by suppressing foaming during the pulp production process, and can reduce the generation of aggregates mainly composed of silicone oil. Furthermore, the glass interleaving paper of the present invention can reduce contamination of the glass substrate surface caused by aggregates mainly composed of silicone oil. DETAILED DESCRIPTION OF THE INVENTION

[0017] The present invention will be described in detail below. The embodiments shown below are merely examples, and the present invention should not be construed as being limited to these embodiments.

[0018] The present inventors have conducted an analysis of foreign matter (contamination) adhering to the surface of a glass substrate, which can cause defects in electronic components formed on the surface of the glass substrate. As a result, it has been discovered that the foreign matter remaining on the surface of the glass substrate even after the water washing process is an aggregate containing silicone oil, and may have a size of several microns or more.

[0019] In the pulp manufacturing process, the use of a defoamer is essential in the pulp washing process and pulp bleaching process to reduce the harmful effects of foaming. Silicone oil is widely used as a defoamer in the pulp manufacturing process. Therefore, the present inventor has studied the defoamers used in the pulp manufacturing process.

[0020] Typical defoamers include mineral oil-based defoamers and silicone-based defoamers. Mineral oil-based defoamers are composed of mineral oil, hydrophobic silica, silicone oil, spreading solvent, emulsifier, water, etc. Silicone-based defoamers are available in oil-based emulsion types (W / O type: water-in-oil type) and self-emulsifying water-based emulsion types (O / W type: oil-in-water type), both of which are composed of silicone oil, spreading solvent, emulsifier, water, etc. Thus, the defoamers used in the pulp manufacturing process, whether mineral oil-based or silicone-based, contain silicone oil.

[0021] Silicone oil is a linear polymer in which dimethylsiloxane is the main monomer unit and is connected by siloxane bonds. The main chain can contain a portion of methylphenylsiloxane or methylhydroxysiloxane. Silicone oils that have been modified by introducing various functional groups into the ends or side chains are called modified silicone oils (see below).

[0022] Silicone-based defoamers have a stronger defoaming effect than mineral oil-based defoamers, so the amount needed can be reduced to 1 / 5 to 1 / 10 of that of mineral oil-based defoamers. For this reason, silicone-based defoamers are often used.

[0023] Silicone oil has a high affinity with pulp fibers and is usually homogeneously adsorbed onto the surface of the pulp fibers. In such cases, defects such as broken wires are unlikely to occur during the assembly process of electronic components. However, because silicone oil is hydrophobic and insoluble in water, it exists as an oily substance in water. Therefore, silicone oil is prone to coagulating with hydrophobic substances in water, forming large aggregates. If silicone oil coagulates and coarses to form foreign particles, for example, larger than several micrometers in size, the aggregates or some of the silicone oil-based components in the aggregates will transfer (contaminate) to the surface of the glass substrate, causing defects.

[0024] Natural resins (colloidal pitch) and gum substances liberated during the pulp manufacturing process are water-insoluble hydrophobic substances. Talc, which is used as a pitch control agent during the pulp manufacturing process, is also a hydrophobic substance. Hydrophobic talc adsorbs the same hydrophobic natural resins and gum substances, forming agglomerates. Similarly, hydrophobic silicone oil adsorbs the natural resins, gum substances, and talc, forming agglomerates.

[0025] Among defoaming agents, when mineral oil-based defoaming agents or oil-based emulsion type (W / O type: water-in-oil type) silicone-based defoaming agents are used, there is a high concern that the silicone oil contained in the defoaming agent will combine with organic, water-insoluble substances derived from natural resins and gum substances liberated during the pulp manufacturing process, as well as talc used as a pitch control agent in the pulp manufacturing process, to form coarse aggregates.

[0026] As mentioned above, silicone-based antifoaming agents are classified into oil-based emulsion types (water-in-oil type: W / O type) and self-emulsifying water-based emulsion types (oil-in-water type: O / W type). Of these, oil-in-water type silicone-based antifoaming agents have high water dispersibility.

[0027] In recent years, various modified silicone oils have been developed to enhance the functionality of silicone oils. Modified silicone oils have a structure in which some of the methyl groups in polydimethylsiloxane are replaced with organic functional groups. Modified silicone oils include amino-modified, epoxy-modified, carboxyl-modified, and polyether-modified types.

[0028] Polyether-modified silicone oils, which have polyether groups introduced as organic functional groups, have polyethylene glycol, polypropylene glycol, polyethylene glycol-polypropylene glycol copolymers, etc. By changing the ratio of organic functional groups or the ethylene oxide (EO) / propylene oxide (PO) ratio in the polyether-modified silicone oil, the solubility in water or alcohol can be changed, and a hydrophilic (water-soluble) modified silicone oil can be obtained.

[0029] Therefore, the present inventors have focused on a self-emulsifying water-based emulsion type (O / W type: oil-in-water type) silicone defoaming agent containing a hydrophilic (water-soluble) modified silicone oil. An example of a hydrophilic (water-soluble) modified silicone oil is San Nopco's product name "SN Deformer 503K."

[0030] The inventors have discovered that self-emulsifying water-based emulsion-type (O / W type: oil-in-water type) silicone defoamers containing hydrophilic (water-soluble) modified silicone oils have poor affinity with hydrophobic natural resins, gum substances, and talc, making them less likely to form aggregates. As a result, they have found that the occurrence of large aggregates that cause problems such as broken wires during the mounting process of electronic components, etc., is greatly reduced.

[0031] The defoaming agent used in the pulp manufacturing process is an auxiliary agent required in the cooking and bleaching processes of wood chips, but is usually unnecessary in the refined pulp after washing. Therefore, it is preferable that the defoaming agent does not remain in the refined pulp. Furthermore, it is also preferable that the defoaming agent does not remain in the papermaking process of glass interleaving paper using the pulp.

[0032] Therefore, the present inventors used a silicone-based defoaming agent containing hydrophilic (water-soluble) modified silicone oil in the pulp manufacturing process, and found that the defoaming agent was easily broken down into fine particles in water due to the shear force during washing in the pulp manufacturing process and the subsequent papermaking process, and was also easily washed away, resulting in a significant reduction in the amount remaining in the glass interleaving paper compared to the amount added to the pulp during pulp manufacturing.

[0033] Furthermore, glass substrates, particularly those used for flat panel displays, require a process of cleaning the surface of the glass substrate using a water-based medium before shipping or before mounting electronic components, etc. This cleaning process also removes any hydrophilic (water-soluble) modified silicone oil that remains in the glass interleaving paper in trace amounts and is transferred to the glass substrate.

[0034] The present inventors actually produced glass interleaving paper using various amounts of an oil-in-water type silicone antifoaming agent containing a hydrophilic (water-soluble) modified silicone oil (hereinafter simply referred to as a "silicone antifoaming agent containing a hydrophilic (water-soluble) modified silicone oil") added in a pulp manufacturing process. Furthermore, the present inventors conducted a transportation test of glass substrates using the glass interleaving paper to check the state of disconnection of wiring formed on the glass substrates.

[0035] As a result, when a silicone-based antifoaming agent containing hydrophilic (water-soluble) modified silicone oil is added to pulp in the pulp production process and the content of the hydrophilic (water-soluble) modified silicone oil in the finished pulp after pulp production is 0.5 to 2 mg / kg in terms of silicone content, it is possible to produce pulp with suppressed foaming in the pulp production process, reduce the generation of aggregates mainly composed of silicone oil, and suppress the occurrence of wire breakage.It is more preferable that the addition rate of the silicone-based antifoaming agent containing hydrophilic (water-soluble) modified silicone oil to pulp is 0.6 to 1.5 mg / kg in terms of silicone content.

[0036] The silicone content is the percentage of silicone extracted from pulp or glass interleaving paper by Soxhlet extraction using hexane. 1 The value was determined by measuring the H-NMR spectrum and expressing the mass content of dimethylsiloxane units (described later).

[0037] Similarly, when the content of hydrophilic (water-soluble) modified silicone oil in the pulp for glass interleaving is 0.5 to 2 mg / kg in terms of silicone content, the occurrence of agglomerates mainly composed of silicone oil can be reduced, and the occurrence of wire breakage can be suppressed.

[0038] Furthermore, a silicone-based defoamer containing hydrophilic (water-soluble) modified silicone oil was added to the pulp for glass interleaving paper, and when the content of the hydrophilic (water-soluble) modified silicone oil relative to the finished pulp after pulp production was 0.5 to 2 mg / kg in terms of silicone content, the content of the hydrophilic (water-soluble) modified silicone oil in the resulting glass interleaving paper was measured. As a result, when the content of the hydrophilic (water-soluble) modified silicone oil relative to the pulp for glass interleaving paper was 0.01 to 0.3 mg / kg in terms of silicone content, the generation of silicone oil-based aggregates was reduced and the occurrence of wire breakage was suppressed. Glass interleaving paper with a silicone content of 0.01 to 0.3 mg / kg is preferred.

[0039] Furthermore, the inventors also investigated the upper limit of the content of talc added as a pitch control agent during the production of pulp or glass interleaving paper. As a result, they found that in order to reduce the formation of silicone oil aggregates and suppress the occurrence of wire breakage, the talc content in pulp or glass interleaving paper is preferably less than 0.1% by mass. The talc content in pulp or glass interleaving paper is more preferably less than 0.01% by mass.

[0040] (pulp) Glass interleaving paper is primarily composed of cellulose pulp with a low content of wood-derived adhesive natural resin (pitch). Chemical pulp is preferred as the cellulose pulp, with kraft pulp (KP) being more preferred. Here, "based on cellulose pulp" means that the cellulose pulp content exceeds 50% by mass relative to the mass of the glass interleaving paper. The cellulose pulp content is preferably 70% by mass or more, more preferably 90% by mass or more, relative to the mass of the glass interleaving paper. Examples of chemical pulps other than kraft pulp include sulfite pulp (SP) and soda pulp (AP).

[0041] The beating degree of the pulp is preferably 200 to 700 mlcsf. Here, the beating degree refers to the Canadian standard freeness according to JIS P8121. By setting the beating degree of the pulp in the range of 200 to 700 mlcsf, the glass interleaving paper can have the mechanical strength and processability required. If the beating degree of the pulp is less than 200 mlcsf, the density of the glass interleaving paper tends to be high and the cushioning property tends to be low, which may make the glass substrate surface more susceptible to scratches. On the other hand, if the beating degree of the pulp is higher than 700 mlcsf, the paper strength is weakened and there is a risk of breakage during distribution or manufacturing. The beating degree of the pulp is more preferably 350 to 600 mlcsf. Known methods can be used to beat the pulp.

[0042] Various known papermaking chemicals can be used when making glass interleaving paper, as long as they do not contaminate the glass surface. Examples of papermaking chemicals include paper strength agents such as polyacrylamide, water-resistant agents such as polyamidepolyamine epichlorohydrin, softeners, antistatic agents, antifoaming agents, slime control agents, fillers, dyes, etc. Since all of these papermaking chemicals have the potential to contaminate the glass substrate, even when they are added, it is preferable to limit their total amount to 0.1% by mass or less.

[0043] (Glass interleaving paper manufacturing method) There are no particular limitations on the method for producing the glass interleaving paper, and it can be produced using various paper machines by selecting appropriate paper-making conditions. Specific examples of paper machines include Fourdrinier formers, twin-wire formers, cylinder formers, and inclined formers. The layer structure of the glass interleaving paper may be single-layered or multi-layered.

[0044] (glass interleaving paper) The smaller the basis weight of the glass interleaving paper, the less weight it will have during transportation, which is preferable, but if it is too small, it will not be able to provide sufficient cushioning for the glass substrate. On the other hand, a relatively large basis weight of the glass interleaving paper is preferable in terms of cushioning function, but if it is too large, the weight will increase during transportation, which is not preferable. Considering the balance between cushioning function and weight and the intended use, the basis weight of the glass interleaving paper is 10 to 100 g / m 2 The more preferable basis weight of the glass interleaving paper is 30 to 80 g / m 2 is.

[0045] The thickness of the glass interleaving paper is preferably 25 to 250 μm from the viewpoint of cushioning properties and workability. The density of the glass interleaving paper is preferably 0.4 to 1.2 g / cm. 3 It is preferable that:

[0046] The glass interleaving paper of this embodiment is suitable for protecting glass substrates when stacking and storing or transporting multiple glass substrates for flat panel displays such as liquid crystal displays, organic electroluminescent displays, touch panels, and plasma displays. In particular, it is suitable for use in liquid crystal displays (for TFTs and color filters) and organic electroluminescent displays, which require extremely high clarity. [Example]

[0047] The present invention will be described in detail below with reference to examples, but the present invention is not limited to these. The numerical values ​​indicating the composition are based on the mass of the solid content or active ingredient (mass %). Unless otherwise specified, the paper produced was treated in accordance with JIS P8111 and then subjected to measurement and evaluation tests.

[0048] <Silicone content in pulp or glass interleaving paper> The pulp was cut into pieces of approximately 1 cm square. The glass interleaving paper was also cut into pieces of approximately 1 cm square. Soxhlet extraction was performed using hexane as a solvent for approximately 3 hours and 30 minutes to extract components from the pulp or glass interleaving paper. The resulting extract was concentrated to dryness using a rotary evaporator and redissolved in 1 mL of deuterated chloroform to prepare a measurement sample. A nuclear magnetic resonance analyzer (AVANCE500 model, manufactured by Bruker Biospin) was used as the measurement device. 1 H-NMR spectra were measured to quantify the dimethylsiloxane units. A calibration curve was created using a polydimethylsiloxane solution in deuterated chloroform as the standard, and quantification was performed using the multi-point calibration curve method.

[0049] <Talc content in pulp or glass interleaving paper> Pulp or glass interleaving paper was ashed according to JIS P8251. Next, the talc content (mass%) in the resulting ash was determined using a fluorescent X-ray diffractometer (Rigaku Corporation, RINT-Ultima III) with a calibration curve prepared in advance using glass interleaving paper containing a predetermined amount of talc. The talc content m in the glass interleaving paper was calculated using the following formula (1): m = (b / a) × c × 100 (1) Where m: talc content (mass%) a: Mass of glass interleaving paper (g) b: Ash mass (g) c: Talc content in ash (mass%)

[0050] <Glass plate transportation test> A urethane foam sheet was laid on the glass support surface of an aluminum L-shaped stand at a 75-degree angle. 120 glass sheets measuring 680mm x 880mm x 0.7mm were stacked on the support surface for vertically placing the glass sheets, and on the backrest surface extending vertically from the rear edge of the support surface. Glass interleaving paper was inserted between each glass sheet and the stacked sheets were placed parallel to the backrest surface. A belt attached to the stand was draped around the entire circumference from the rear edge to the backrest surface to secure the glass sheets. The stand, once set up as described above, was completely covered with packaging material to prevent the intrusion of external dust and other particles. The units were then transported by truck over a distance of 1,100km (including five days of storage at 40°C and 95% RH during transport).

[0051] <Performance evaluation> After the transportation test, linear wiring with a width of 5 μm was formed at intervals of 80 μm on the surfaces of 120 glass plates using an existing method. Next, the disconnection status of the formed wiring was checked. Performance evaluation was carried out as follows. ○: No breaks in the wiring on any of the glass plates. ×: There was a break in the wiring of multiple glass plates.

[0052] [Example 1] The raw pulp used was commercially available NBKP (softwood bleached kraft pulp) A, which does not contain any added talc. An oil-in-water (O / W) silicone antifoaming agent, primarily composed of hydrophilic (water-soluble) modified silicone oil, was used in the pulp washing and bleaching processes during the pulp manufacturing process. A pulp slurry with a beating degree of 450 ml csf was prepared, yielding a pulp with a silicone content of 1.3 mg / kg and a talc content of 0% by mass. This pulp was then used to make paper on a Fourdrinier paper machine without the addition of any papermaking chemicals. After papermaking, the paper was dried to a basis weight of 50 g / m. 2 Thus, glass interleaving paper having a silicone content of 0.2 mg / kg and a talc content of 0 mass % was obtained.

[0053] [Example 2] The raw pulp used was commercially available NBKP (softwood bleached kraft pulp) B, which does not contain any talc. An oil-in-water (O / W) silicone antifoaming agent, primarily composed of hydrophilic (water-soluble) modified silicone oil, was used in the pulp washing and bleaching processes during the pulp manufacturing process. A pulp slurry with a beating degree of 450 mlcsf was prepared, yielding a pulp with a silicone content of 0.7 mg / kg and a talc content of 0% by mass. The remaining conditions were the same as in Example 1, and the pulp was then spun to a basis weight of 50 g / m. 2 Thus, glass interleaving paper having a silicone content of 0.1 mg / kg and a talc content of 0 mass % was obtained.

[0054] [Comparative Example 1] The raw pulp used was commercially available NBKP (softwood bleached kraft pulp) C, which does not contain any added talc. A water-in-oil (W / O) silicone antifoaming agent, primarily composed of unmodified silicone oil, was used in the pulp washing and bleaching processes during the pulp manufacturing process. A pulp slurry with a beating degree of 450 mlcsf was prepared, yielding a pulp with a silicone content of 1.1 mg / kg and a talc content of 0% by mass. The remaining conditions were the same as in Example 1, and the pulp was then spun to a basis weight of 50 g / m. 2 Thus, glass interleaving paper having a silicone content of 0.8 mg / kg and a talc content of 0 mass % was obtained.

[0055] Comparative Example 2 The raw pulp used was commercially available NBKP (softwood bleached kraft pulp) D, to which talc had been added. A water-in-oil (W / O) silicone antifoaming agent, primarily composed of unmodified silicone oil, was used in the pulp washing and bleaching processes during the pulp manufacturing process. A pulp slurry with a beating degree of 450 mlcsf was prepared, yielding a pulp with a silicone content of 1.2 mg / kg and a talc content of 0.7% by mass. The remaining conditions were the same as in Example 1, and the pulp was then mixed to a basis weight of 50 g / m. 2 As a result, glass interleaving paper with a silicone content of 0.9 mg / kg and a talc content of 0.3 mass % was obtained.

[0056] Comparative Example 3 The raw pulp used was commercially available NBKP (softwood bleached kraft pulp) E, which does not contain any talc. A non-emulsion mineral oil-based antifoaming agent was used in the pulp washing and bleaching processes during the pulp production process. A pulp slurry with a beating degree of 450 mlcsf was prepared, yielding a pulp with a silicone content of 3.5 mg / kg and a talc content of 0% by mass. The remaining conditions were the same as in Example 1, and the pulp was then mixed to a basis weight of 50 g / m. 2 As a result, glass interleaving paper with a silicone content of 1.8 mg / kg and a talc content of 0 mass % was obtained.

[0057] [Table 1]

[0058] Table 1 shows the evaluation results for Examples 1 and 2 and Comparative Examples 1 to 3. As a result, for the glass plates laminated using the glass interleaving paper of Examples 1 and 2, no breaks in the wiring were observed in any of the glass plates. In contrast, for the glass plates laminated using the glass interleaving paper of Comparative Examples 1 to 3, several glass plates were found to have breaks in the wiring. From these results, it became clear that the glass interleaving paper of the present invention is effective in suppressing defects such as breaks caused by contamination.

Claims

1. A pulp for glass interleaving paper, characterized by containing a silicone-based defoaming agent containing hydrophilic modified silicone oil.

2. 2. The pulp for glass interleaving paper according to claim 1, wherein the content of talc added as a pitch control agent is less than 0.1% by mass.

3. A glass interleaving paper having a basis weight of 10 to 100 g / m2, which is mainly composed of the pulp for glass interleaving paper according to claim 1 or claim 2. ２ A glass interleaving paper characterized by:

4. 4. The glass interleaving paper according to claim 3, wherein the content of talc added as a pitch control agent is less than 0.1% by mass.

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