JP6611196B2 - Insert paper - Google Patents

Description

  The present invention relates to an insertion sheet used for surface protection of materials.

  When transporting and storing a metal plate, a circuit board made of a composite material such as resin or glass fiber, a glass plate, or the like, paper that is inserted in order to protect the surface is generally referred to as insertion paper. Various materials are selected for the interleaving paper according to its use, but in many cases where cost is important, paper using waste paper raw materials is used. However, book back paste, hot melt adhesive, and adhesive tape are likely to be mixed into the waste paper raw material. Among them, acrylic resin adhesives used for adhesive tapes are unlikely to undergo chemical changes, so they tend to remain in the paper products that use the used paper raw materials together with the used paper raw materials. Often mixed as a raw material. When this acrylic resin adhesive is contained in the interleaf paper, there is a problem that the plate-like material to be protected is soiled or scratched. For example, if there is an adhesive on the surface of the insertion sheet, it will adhere to the object to be protected, and when the insertion sheet is peeled off from the object, the insertion sheet may be torn, or adhesive marks or paper fragments may remain on the object to be protected Happens.

  In addition, the interleaving paper is required to have close contact with an object to be inserted at the time of use. For this reason, the interleaf paper or its object is often charged and the two are brought into close contact with each other using static electricity generated at that time. For example, when sandwiching an insertion sheet in a flat product, it may be used in close contact with the product one by one, and a process of storing the product tilted 70 to 80 degrees with respect to the horizontal plane may be employed. If the interleaf is less likely to be charged, it will easily fall off from the plate due to its own weight from the protective surface, but due to the appropriate charging property, the interposer will tend to adhere to the product on the flat plate. Improved handling.

  As a proposal for detackifying an adhesive substance contained in glass interleaving paper, Patent Document 1 describes the use of a detackifying agent selected from a surfactant, a water-soluble polymer, and talc. However, when a surfactant or a water-soluble polymer is used, the conductivity of the slip sheet is increased, and electrostatic adhesion becomes difficult. Therefore, handling properties in the process of inserting the slip sheet into the glass plate are remarkably deteriorated. This has the same problem because the conductivity of the interleaf paper is improved even if the object is not a glass plate. Further, when talc is used as a non-adhesive agent, there is a problem that a hydrophobic substance and talc contained in paper are combined to contaminate a glass plate (see Patent Document 2).

JP 2007-131965 A Japanese Patent Application No. 2014-264218

  An object of this invention is to solve the said problem which generate | occur | produces by including the adhesive of an insertion sheet, and the handleability in the scene which uses an insertion sheet.

  As a result of various studies on the interleaving paper, the present inventors have found that by using esterase, the adhesive can be made non-adhesive without increasing the conductivity of the interleaving paper.

That is, the present invention is an interleaving paper containing a papermaking raw material and esterase and having a surface specific resistance value of 1 × 10 ¹² Ω / □ or more.

  It is preferable that the interleaving paper includes a waste paper raw material in a papermaking raw material. Moreover, it is preferable that the said waste paper raw material contains an adhesive.

  It is preferable that the insertion sheet is used as a slip sheet. In particular, interleaf paper for metal plates, interleaf paper for circuit boards, interleaf paper for printing plates, or interleaf paper for glass plates is preferable.

  Furthermore, the present invention relates to a method for producing an interleaving paper containing a papermaking raw material, wherein esterase is added during the production process.

  Since the interleaving paper of the present invention has both adhesiveness and surface chargeability, the problem of adhesive material contacting or transferring to the surface of the plate-like material laminated with the interleaving paper is solved, and It is possible to improve the efficiency of electrostatic adhesion during lamination.

  The interleaving paper of the present invention contains a papermaking raw material and esterase.

  As a preferable example of the papermaking raw material, natural fibers usually used in the wet papermaking method can be mentioned. The interleaving paper of the present invention is mainly composed of fibers, and the fibers may include papermaking raw materials (natural fibers) and fibers other than papermaking raw materials (chemical fibers). The fiber content in the interleaving paper of the present invention is preferably 80% by mass or more, more preferably 90% by mass or more, based on the total mass of the interleaving paper.

  The interleaving paper of the present invention is a paper mainly composed of fibers, and includes a papermaking raw material as the fibers. As the papermaking raw material, those generally used can be used without particular limitation. For example, as natural fibers, softwood bleached kraft pulp (NBKP), hardwood bleached kraft pulp (LBKP), softwood bleached sulfite pulp (NBSP), Thermomechanical pulp (TMP), wood pulp such as recycled pulp made from waste paper; other non-wood pulp such as hemp, bamboo, straw, kenaf, sanaf, straw, cotton, etc .; modification of cationized pulp, mercerized pulp, etc. Pulp etc. are mentioned, These 1 type can be used individually or in combination of 2 or more types. In particular, waste paper raw materials are preferable because they are easy to procure, are inexpensive, and resources can be reused. In particular, waste paper materials containing pressure-sensitive adhesives are readily available and very inexpensive. According to the present invention, waste paper materials containing such an adhesive can be used without any problem.

When the beating of the papermaking raw material is advanced, an effect of increasing the paper interlayer strength of the interleaving paper can be expected, for example, the beating degree is 300 to 650 mlc. s. f. It is preferable that The degree of beating here is JIS
It means Canadian standard freeness specified in P8121. Freeness is a value that indicates the degree of beating of fibers (a process of mechanically beating and grinding fibers in the presence of water). Usually, the smaller the freeness value, the stronger the degree of beating. The damage of this is great and fibrillation is progressing. The adjustment of the freeness, that is, the adjustment of the beating degree of the fiber can be performed by appropriately adjusting the type of the beating apparatus and the processing conditions (fiber concentration, temperature, pressure, rotation speed, blade shape, processing frequency, etc.). A well-known thing can be used as a beating apparatus.

The papermaking raw material (natural fiber) is preferably 50% by mass or more, more preferably 80% by mass or more, and still more preferably 90% by mass or more, based on the entire fibers in the interleaving paper. As fibers (chemical fibers) other than papermaking raw materials, synthetic fibers such as rayon, vinylon, nylon, acrylic and polyester, chemical fibers, microfibrillated pulps such as polyolefins, or inorganic fibers such as metal fibers and carbon fibers alone are used. Alternatively, they can be mixed and used together with the papermaking raw material.

  The interstitial paper of the present invention is a fiber that contains the above-mentioned papermaking raw material, and is made by a known long web paper machine, circular net paper machine, short net paper machine, long net and circular net combination paper machine, etc. It can be obtained by an ordinary method (wet paper making method). The interleaving paper of the present invention may be composed of a plurality of layers, but is preferably a single layer.

  The interleaving paper of the present invention contains esterase. When the esterase acts on the adhesive, the adhesiveness can be reduced.

  The “adhesive” is a substance (adhesive-containing component) that can be unintentionally contained in the insertion paper of the present invention, and the insertion paper of the present invention is used in contact with the surface of the object to be protected. In addition, it is a substance that adheres to the surface and causes problems. The interleaf paper of the present invention is characterized in that the stickiness of the sticky product is lowered, preferably non-tacky, by an esterase which is an essential component. The adhesive (adhesive component) includes natural resins and fatty acids contained in paper raw materials such as wood pulp, adhesive substances such as adhesives and latex mixed from waste paper, and additive chemicals used in the papermaking process It is a water-insoluble substance mainly composed of organic substances generated by the like, and is also called pitch, sticky, etc. In general, such an adhesive is colloidally dispersed in the slurry of the papermaking process in the production of the interleaving paper of the present invention, but there is some kind of shearing force, rapid pH change, addition of an ionic drug, etc. It is thought that the colloidal state is destroyed by external action, and is agglomerated and coarsened.

  The esterase is not particularly limited as long as it has a catalytic action to hydrolyze an ester bond, and a general-purpose one can be used. Examples include acetylesterase, acetylcholinesterase, carboxylesterase, allylesterase, triacylglycerol lipase, phospholipase, lysophospholipase, butyrylcholinesterase, tropine esterase, and pectinesterase, and one or more of these are used in combination. In the present invention, the esterase itself may be denatured after the esterase detackifies the adhesive. That is, the interleaf paper of the present invention is either the same as the esterase as a raw material blended at the time of production thereof, or a modified esterase that is in a form after the esterase has developed the adhesive expression action of the adhesive. One or both can be included.

  The esterase can be used, for example, during the manufacturing process of the papermaking raw material, the preparation process, or the papermaking process of the interleaf paper. The addition amount and treatment time are not particularly limited, and may be so long as the pressure-sensitive adhesive (adhesive-containing component) is sufficiently non-adhesive by esterase. However, it is necessary to consider the environment from the addition of the esterase to the treatment, and it is preferable that the temperature and pH are within a range where the activity is sufficiently performed without inactivating the esterase. For example, the temperature is preferably 15 ° C to 70 ° C, more preferably 20 ° C to 60 ° C. The pH is preferably 4-8, more preferably 4-6.

  The process for producing the papermaking raw material is typically a pulp production process, and is a process for obtaining a pulp sheet through cooking / bleaching of wood chips or disaggregation / deinking of used paper. The preparation step is a step of producing a paper stock (slurry) containing fibers after the pulp sheet is disaggregated and beaten. The paper making process is a process of forming wet paper by making fibers from the stock.

The esterase may be used in any form, but it is preferable to use a pharmaceutical type or a mixture with papermaking chemicals. The former formulation type is typically a solid substance consisting of esterase alone. The latter mixing type is a mixture of esterase and papermaking chemicals, and includes solids and liquids. Specific examples of the papermaking chemicals in this mixed type will be described later. In particular, when a mixture of esterase and papermaking chemicals is used, an effect of suppressing the cohesive action of the adhesive can be obtained. As such an example, trade name “OPTIMYZE 525” manufactured by Bachman Laboratories Co., Ltd. may be mentioned. When the esterase is a formulation type, depending on the content, it is preferable to add 0.01 parts by mass or more, and more preferable to add 0.02 parts by mass or more with respect to 100 parts by mass of the papermaking raw material.

  The interleaving paper of the present invention may contain components other than those described above as long as the performance is not affected. For example, paper strength enhancers or fixing agents such as starch, polyacrylamide, polyamine polyamide epichlorohydrin, sizing agents, fillers, drainage retention improvers, water resistance agents, fixing agents, antifoaming agents, slime control agents, pitch control agents, etc. These may be used alone or in combination of two or more. These other components are generally used as papermaking chemicals. These other components (papermaking chemicals) can be used as components to be mixed with the esterase in the above-mentioned mixed type esterase.

The basis weight of the insertion sheet of the present invention is not particularly limited, and may be adjusted as appropriate according to the object to be protected. For example, when using the interleaving paper as a slip sheet for glass, the basis weight is preferably 30 to 100 g / m ² , more preferably 30 to 50 g / m ² .

The interstitial paper of the present invention has a surface resistivity of 1 × 10 ¹² Ω / □ or more. In general, the insertion sheet is used during transportation and storage of the object to be protected. When the insertion sheet is brought into contact with the object to be protected, an effect of making it difficult to fall off due to generation of static electricity can be obtained. After use, remove the interleaving paper from the object to be protected. At the time of this removal, a strong electrostatic force that is difficult to remove from the object to be protected even when static electricity is generated does not occur in the “paper category”. Then, the effect which makes it difficult to fall off from a protection target object moderately is acquired by making an interleaf sheet into the said surface specific resistance value. On the other hand, if it is less than 1 × 10 ¹² Ω / □, the interleaving paper tends to fall off from the object to be protected, and therefore handling is bad in the manufacturing process of the flat object to be protected. The range of the surface specific resistance value is preferably 1 × 10 ^{12 to} 5 × 10 ¹³ Ω / □, and more preferably 5 × 10 ¹² to 4 × 10 ¹³ Ω / □. As an example of the interleaving paper included in the “paper category”, the ratio of the mass of the papermaking raw material (natural fiber) to the mass of all fibers in the interleaving paper (natural fiber occupancy) is 50% by mass or more. Insert paper.

  When a non-tackifying treatment agent such as the above-mentioned surfactant or water-soluble polymer that is usually used to detackify an adhesive (adhesive-containing component) that can be contained in an adhesive or interleaving paper, The resistance value tends to decrease excessively. Thus, in the present invention, by using the esterase, non-adhesion can be realized while keeping the surface resistivity within a certain range.

  In addition, as long as the surface specific resistance value can be controlled within the above range, a non-tackifying treatment agent other than esterase (an agent that can reduce the adhesiveness of the adhesive-containing component in the interleaf paper) may be used in combination. For example, the method of using a pitch control agent together is mentioned.

  As another non-tackifying treatment agent that can be used in combination with esterase in the interleaving paper of the present invention, a non-tackifying treatment agent containing a phenolic resin (hereinafter, also referred to as “phenolic non-tackifying treatment agent”) can be mentioned. In the present specification, “non-adhesive” means that the stickiness of an adhesive (adhesive-containing component) that can be included in the interleaving paper is difficult to adhere to the surface of the protection object of the interleaving paper. This means that the ultimate state of “non-adhesion” is the state of zero tackiness.

Phenol-based non-tackifying treatment agents are capable of non-tacking isoprene rubber, which has been difficult to detackify with this type of conventional non-tackifying treatment agent. Isoprene rubber is often mixed from the waste paper raw material, and therefore, when the waste paper raw material is used as the raw material for the interleaving paper, it is preferable to use a phenol-based non-tackifying agent in combination. In general, waste paper raw materials containing isoprene rubber are of low quality and low price, so the active use of the waste paper raw materials in the interleaving paper contributes to the reduction of the manufacturing cost of the interleaving paper, It can also lead to a reduction in environmental load. In addition, when this type of conventional non-tackifying agent is contained in paper, the inherent conductivity of the paper increases (that is, the chargeability decreases). As a result, electrostatic adhesion of the paper to the surface to be protected is prevented. For this reason, even if the paper is brought into contact with the surface to be protected, there is a risk that the paper will fall off from the surface to be protected due to its own weight, and handling properties will be reduced. In contrast, phenolic non-tackifying treatment agents, like esterases, do not substantially affect the conductivity or chargeability of the paper in which they are blended, so the paper surface resistivity is kept within a certain range. However, non-adhesion can be realized. That is, the interstitial paper containing the phenol-based non-tackifying treatment agent may have a surface specific resistance value of 1 × 10 ¹² Ω / □ or more.

  The content of the phenolic non-tackifying treatment agent in the interleaf paper of the present invention is the phenolic resin contained in the phenolic non-tackifying treatment agent (specifically, for example, each phenol of the following (A) to (D)) The content of (resin) is preferably 0.001 to 0.05 mass%, more preferably 0.003 to 0.03 mass%, based on the total mass of the sheet. If the content of the phenol-based non-tackifying agent is too small, it is not meaningful to use this, and if it is too large, the object to be protected may be contaminated or the other performance of the interleaf paper may be adversely affected.

  Hereinafter, the phenol non-tackifying treatment agent used in the present invention will be described. The phenolic non-tackifying treatment agent used in the present invention contains a phenolic resin.

  The phenolic resin contained in the phenolic non-tackifying treatment agent used in the present invention includes (A) a novolak type phenolic resin and its modified phenolic resin, (B) a resol type phenolic resin and its modified phenolic resin, and (C). What carried out the secondary reaction process to the said (A) or (B) can be used, These 1 type can be used individually or in combination of 2 or more types.

The (A) novolac-type phenol resin is a phenol resin obtained by reacting phenols and aldehydes in the presence of an acidic catalyst.
The resol type phenol resin (B) is a phenol resin obtained by reacting phenols and aldehydes in the presence of a basic catalyst.
Examples of the product subjected to the secondary reaction treatment (C) include resins whose molecular weight is controlled by adding aldehydes to an alkaline solution of a phenol resin and reacting with the phenol resin.
Examples of the modified phenolic resins (A) and (B) include Mannich reaction products obtained by reacting phenols and / or phenol resins, amines and aldehydes.

  The weight average molecular weights of the phenol resins and modified phenol resins of (A) to (C) are not particularly limited, but the effects and effects of the phenol-based non-tackifying treatment agent containing them (adhesive-containing component contained in the interleaf paper) From the viewpoint of the balance between the production efficiency when the interleaf paper is produced by the wet papermaking method, preferably from 500 to 60,000, more preferably from 1,000 to 60,000, more preferably. Is in the range of 1,000 to 30,000.

The phenols used in the production of the (A) novolac type phenol resin and the (B) resol type phenol resin are not particularly limited, and examples thereof include phenol, cresol isomers, ethylphenol isomers, and xylenol. Polyisomers such as isomers, alkylphenols such as butylphenol, unsaturated alkylphenols such as cardanol, polyaromatic phenols such as α and β naphthol, bisphenol A, bisphenol F, bisphenol S, pyrogallol, resorcin, and catechol Examples thereof include phenols and hydroquinone, and one of these can be used alone or in combination of two or more.

  The aldehydes used in the production of the (A) novolac type phenol resin and the (B) resol type phenol resin are not particularly limited, and examples thereof include formaldehyde, paraformaldehyde, acetaldehyde, propylaldehyde, benzaldehyde, and salicyl. Examples include aldehydes and glyoxal, and one of these can be used alone or two or more can be used in combination.

  In the production of the modified phenolic resins (A) and (B), the amines used in the Mannich reaction are not particularly limited, and examples thereof include isophorone diamine, metaxylene diamine, diethylene triamine, diethanol amine, and N-methyl ethanol amine. These may be used, and one of these may be used alone or in combination of two or more. Examples of the aldehydes used in the Mannich reaction include the same aldehydes that can be used for the production of the (A) novolac type phenol resin and the (B) resol type phenol resin.

  As the phenolic resin contained in the phenolic non-tackifying treatment agent used in the present invention, in addition to the above (A) to (C), (D) the ortho-ortho bond ratio of the methylene group to the phenolic hydroxyl group is 40%. The above-described phenol resin (hereinafter, also referred to as “high-ortho-type phenol resin”) can be used.

The above-mentioned “ortho-ortho bond ratio of methylene group to phenolic hydroxyl group” (hereinafter, also simply referred to as “ortho-ortho bond ratio”) refers to methylene that bonds two consecutive benzene skeletons forming part of a phenol resin. A methylene group whose position is ortho to each of the phenolic hydroxyl groups bonded to the two benzene skeletons (hereinafter, the carbon related to the methylene group is referred to as an “o, o′-bond”). (Referred to as “carbon”) relative to the total methylene groups present in the phenolic resin.
Similarly, a methylene group that binds two consecutive benzene skeletons that form part of a phenol resin, one of which is ortho-positioned to each phenolic hydroxyl group that binds to the two benzene skeletons The carbon related to the methylene group in which the other is in the para position is referred to as “o, p-bonded carbon”.
And a methylene group that bonds two consecutive benzene skeletons forming a part of the phenolic resin, each of which is in the para position with respect to the respective phenolic hydroxyl groups bonded to the two benzene skeletons. Carbon related to a certain methylene group is referred to as “p, p′-bonded carbon”.
A phenol resin having a methylene group ortho-ortho bond ratio of less than 40% with respect to a phenolic hydroxyl group may be hereinafter referred to as a “random phenol resin”.

  The ortho-ortho bond ratio of the high ortho type phenol resin (D) is preferably 50% or more, more preferably 55% or more, more preferably 60% or more, and most preferably 100%. The ortho-ortho bond rate of the phenol resin is measured by the following method.

<Method for measuring ortho-ortho bond ratio>
The sample (phenol resin) was subjected to 13C-NMR spectrum analysis using nuclear magnetic resonance spectroscopy (NMR, manufactured by JEOL Ltd., JNM-LA400). From the obtained results, o, o′-bonded carbon, It calculates from following formula (1) using the integrated value of o, p-bonded carbon and p, p'-bonded carbon. As measurement conditions, the sample is dissolved in deuterated methanol, and the integration is performed 5000 times.
Ortho-ortho bond rate (%) = [o, o′−integral value of bond carbon / (o, o′−integral value of bond carbon + o, p−integral value of bond carbon + p, p′−integral of bond carbon) Value)] × 100 (1)

The (D) high-ortho-type phenolic resin generally includes phenol and phenol as described in JP-A-55-90523, JP-A-59-80418, JP-A-62-230815, and the like. Using an aldehyde and a divalent metal salt such as zinc acetate, lead acetate, or zinc naphthenate as a catalyst, after an addition condensation reaction under weak acidity, the condensation reaction proceeds while dehydrating, and if necessary, an unreacted monomer is removed. It can manufacture by removing. In addition, the high ortho type phenol resin manufactured in this way may be partially modified as long as the effects of the present invention are not impaired.
The high ortho type phenol resin (D) may be a novolak phenol resin or a resol phenol resin. The novolak phenol resin is an acid catalyst used in the condensation reaction of phenol and formaldehyde, and the resol phenol resin is an alkaline catalyst used in the reaction.

  The weight-average molecular weight of the (D) high-ortho-type phenol resin is not particularly limited, but the effects and effects of the phenol-based non-tackifying agent containing this (such as the adhesive-reducing action of the adhesive-containing component contained in the insert) ) And the production efficiency when the interleaving paper is produced by a wet papermaking method, preferably 500 to 10,000, more preferably 1,000 to 10,000, more preferably 1,000 to 8. , 000.

  There is no particular limitation on the method of including the phenolic non-tackifying agent in the interleaf paper. Since the interleaf paper of the present invention is typically produced according to a known wet papermaking method, for example, in the same manner as the esterase, phenol can be used in any step of the interleaf paper production method by the wet papermaking method. A system non-tackifying treatment agent can be added. Specifically, for example, the phenol-based non-tackifying treatment agent is used in various chests in the papermaking raw material production process (pulp production process), the preparation process, the papermaking process, or the white water (drainage from the papermaking process) recovery process. And / or can be added to the piping or added to the shower for cleaning.

  In the method of manufacturing the interleaf paper by the wet papermaking method, when the phenol-based non-tackifying agent is added in a predetermined step, the phenol-based non-tackifying agent is dissolved in an alkaline solution or an acid solution. It is preferable to add (phenolic non-tackifying agent solution). The phenol resins (A) to (C) may be dissolved in either an alkali solution or an acid solution, but the high ortho phenol resin (D) is preferably dissolved in an alkali solution.

Regarding the phenolic resins (A) to (C), the total content of the phenolic resin and / or modified phenolic resin and alkali or acid in the phenolic non-tackifying agent solution is the predetermined content of the present invention described above. From the viewpoint of ensuring the effect, the content is preferably at least 80% by mass, more preferably 90% by mass or more, and may be 100% by mass. The phenol-based non-tackifying agent solution may contain other optional components such as other resins as long as the object of the present invention is not impaired.
In addition, regarding the high ortho type phenol resin of (D), the content of the high ortho type phenol resin in the phenol non-tackifying agent solution (alkaline solution) more reliably exhibits the predetermined effect of the present invention described above. From the viewpoint of making it to occur, it is preferably 5 to 50% by mass, and more preferably 10 to 40% by mass.

The alkali solution is preferably an alkali metal hydroxide solution from the viewpoint of sufficiently dissolving the phenol resin and / or the modified phenol resin. As the alkali metal hydroxide, sodium hydroxide, potassium hydroxide, lithium hydroxide and the like are preferable, and sodium hydroxide is more preferable.
Examples of the acid solution include an inorganic acid solution and an organic acid solution. From the viewpoint of sufficiently dissolving the phenol resin and / or the modified phenol resin, an inorganic acid solution is preferable. As the inorganic acid solution, hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid solution and the like are preferable, hydrochloric acid, sulfuric acid or nitric acid is more preferable, and hydrochloric acid is more preferable.

  As the solvent for the alkaline solution or acid solution, water is preferably used, but may contain other solvents. The content of water in the solvent is 80% by mass or more, preferably 90% by mass or more, more preferably 95% by mass or more, still more preferably 99% by mass or more, and still more preferably 100%. % By mass. Other solvents include, but are not limited to, ketones such as acetone, esters such as ethyl acetate, water-soluble organic solvents such as alcohols such as methanol, amines, and the like.

  The description in JP-A No. 2014-141774 is appropriately applied to the phenol resins of (A) to (C), and JP-A No. 2014-14201 is described for the high-ortho-type phenol resin of (D). The description in the publication is applied as appropriate.

  The insertion sheet of the present invention can be used for surface protection of an object to be protected with which the insertion sheet can be electrostatically adhered, and can be said to be a surface protection sheet. Examples of the material for forming such an object to be protected include glass, metal, and synthetic resin, and a composite material containing two or more of these may be used. Further, the shape of the object to be protected protected by the insertion sheet of the present invention is typically a flat plate shape, but is not limited thereto. In addition, the interleaving paper of the present invention is typically used as a slip sheet, that is, used in a laminate in which a plurality of objects to be protected are laminated and disposed between the layers of the laminate, In addition to such use as an interleaving paper (arrangement between layers of a laminate), it can be used in close contact with the surface of one object to be protected (for example, one glass plate).

  The interleaving paper of the present invention is preferably used as a slip sheet. The surface of the interleaf paper is the object to be protected, the circuit board of a composite material such as resin or glass fiber, the printing plate (there is a photosensitive image-forming layer on the substrate), the surface of or between the glass plates It is used by contacting or laminating. In order to protect the surfaces of these metal plates, circuit boards, printing plates, and glass plates, the interleaving paper of the present invention is used as a slip sheet. Therefore, the interleaving paper of the present invention is preferably a metal sheet interleaf, a circuit board interleaf, a printing plate interleaf, or a glass sheet interleaf.

  Since the interleaf paper of the present invention has low adhesiveness, it hardly contaminates the object to be protected. Therefore, for example, there is an effect that cleaning using a chemical for removing the adhesive foreign matter of the protection target is not required. The interleaving paper of the present invention can be used for general surface protection applications of products having specular gloss such as metal plates, circuit boards made of composite materials such as resin and glass fiber, and the surface of glass plates. One is also a method for protecting the glass plate and the like.

  EXAMPLES Hereinafter, examples are given to specifically describe the present invention, but the present invention is not limited to the following examples.

[Example 1]
Prepare raw paper materials from newspapers and magazines and beat the raw materials to 300 mlc. s. f. 0.03 parts by mass of an esterase-containing enzyme preparation (pig liver esterase, manufactured by Wako Pure Chemical Industries, Ltd.) with respect to 100 parts by mass of the waste paper raw material was added to the slurry prepared at pH 5.5 and 30 ° C. After 4 hours of treatment, 0.4% strength pulp slurry was obtained. This was used to obtain an interleaving paper having a basis weight of 45 g / m ² using a long paper machine.

[Example 2]
In the same manner as in Example 1 except that 400 ppm of a pitch control agent (trade name “OPTIMYZE 525”, manufactured by Bachman Laboratories, Inc.) containing esterase is added instead of the esterase, an insertion space having a basis weight of 45 g / m ² I got paper. The pitch control agent used here is not the phenol-based non-tackifying agent.

Example 3
In addition to the esterase, the same procedure as in Example 1 was conducted except that 300 ppm of the phenol-based non-tackifying agent (trade name “Span Plus 520”, manufactured by Kurita Kogyo Co., Ltd.) as a non-tackifying agent was used simultaneously with the esterase. Thus, a paper having a basis weight of 45 g / m ² was obtained.

[Comparative Example 1]
A paper having a basis weight of 45 g / m ² was obtained in the same manner as in Example 1 except that the esterase was not used.

[Comparative Example 2]
A paper having a basis weight of 45 g / m ² was obtained in the same manner as in Example 1 except that 1000 ppm of a surfactant (trade name Peremin AO-15, Miyoshi Oil & Fat Co., Ltd.) was added instead of the esterase.

[Comparative Example 3]
A paper having a basis weight of 45 g / m ² was obtained in the same manner as in Example 1 except that 1000 ppm of a water-soluble polymer pitch control agent (trade name: Detac DC3970, manufactured by Yuka Kogyo Co., Ltd.) was added instead of the esterase. The pitch control agent used here is a non-phenolic compound and not the phenolic non-tackifying agent.

[Evaluation]
About the insertion sheet of each Example and the comparative example, the performance was evaluated by the following method. The results are shown in Table 1 below. In addition, each sheet | seat of evaluation object processed for according to JISP-8111 before evaluation, and used for evaluation.

<Evaluation method of surface resistivity>
The surface resistivity was measured according to JIS K6911. Super insulation resistance meter 432 for measurement
9A (manufactured by Yokogawa HEWLET-PACKARD) was used, and measurement was performed at an overload voltage of 1000V.

<Evaluation method for ease of attachment to protected objects>
An insertion sheet of the same size is sandwiched between two acrylic plates of 150 mm × 150 mm thickness 3 mm and left to stand for 1 hour. After 1 hour, stand upright with respect to the horizontal plane, and when one sheet is removed, the insertion sheet remains on the other sheet of paper that stands upright on the insertion sheet attachment surface. A state where a gap is formed between the acrylic plate and the acrylic plate was marked with ◯, and a state where the acrylic plate dropped off was marked with x.

<Evaluation method for adhesion marks>
Seven sheets of interleaving paper to be evaluated were prepared, and the seven sheets and eleven crown glass plates (S9111 made by Matsunami Glass) having the same shape and dimensions as those of the sheet in the thickness direction. The laminate was placed on a flat floor with the thickness direction (lamination direction) coincided with the vertical direction, and left in an environment of a temperature of 23 ° C. and a humidity of 50% RH for 16 hours. . After that, except for the top 11 of the 11 objects to be protected, the surface of each of the remaining 10 objects to be protected (contact surface with the insertion sheet) was visually observed, and all of these surfaces were observed. The case where the trace of the adhered foreign substance could not be confirmed was ◎, the trace which could be visually confirmed only at one or two places could be confirmed, but the case where it could be removed by running water washing was marked as ◯, and the case other than that was marked as x.

  As shown in Table 1, each Example was easy to adhere to the object to be protected, and the problem of sticking marks did not occur. On the other hand, since the esterase was not used for the comparative example 1, adhesiveness was not reduced and the problem of the adhesion trace occurred. In Comparative Example 2, the surfactant was used in place of esterase, and as a result, the surface resistivity of the interleaf paper was lowered and dropped from the protection target. In Comparative Example 3 as well, the surface resistivity of the interleaving paper was lowered and dropped from the protection target.

Claims (7)

An interleaving paper containing a papermaking raw material and esterase and having a surface resistivity of 1 × 10 ¹² Ω / □ or more.   The interleaf paper according to claim 1, wherein the papermaking raw material includes a used paper raw material.   The interleaf paper according to claim 2, wherein the waste paper raw material contains an adhesive.   Furthermore, the non-adhesive processing agent which reduces the adhesiveness of the adhesive content component in the said insertion sheet | seat is included, and this non-adhesive processing agent contains a phenol-type resin. Insert paper.   The insertion sheet according to any one of claims 1 to 4, which is a slip sheet.   The interleaving paper according to claim 5, which is an interleaf paper for a metal plate, an interleaf paper for a circuit board, an interleaf paper for a printing plate, or an interleaf paper for a glass plate.   A method for producing an interleaf paper comprising a papermaking raw material, wherein esterase is added during the production process.