Correction adhesive tape

Abstract

To provide an adhesive tape for correction which has good writing property to a surface of an adherend such as a document containing the adhesive tape for correction after having been stuck to the adherend, and prevents blocking without using a separator covering an adhesive surface when being formed into a pancake so as to be stored in an adhesive tape sticking device for correction.SOLUTION: An adhesive tape for correction is used while being stuck to an adherend, wherein a white concealing layer and a release layer are stacked in this order from a base material side on one surface of the base material, an adhesive layer is provided on the other surface of the base material, the release layer does not contain a silicone resin, the thickness of the release layer is 0.1 μm or more and 2.0 μm or less, and the adhesive force of the adhesive layer measured by a specific measurement method is 0.2 N / 25 mm or more and 1.0 N / 25 mm or less.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an adhesive correction tape for correcting characters such as those on documents with written text, etc., which is attached to an adherent such as a document. Specifically, it relates to an adhesive correction tape that can write characters on its own surface after being attached to a document or the like.

Background Art

[0002] Conventionally, various tapes have been proposed as such adhesive correction tapes. For example, in Patent Document 1, a correction tape is proposed, which is characterized in that a correction tape body (l) is composed of a paper base material sheet (2) made of paper and an adhesive resin layer (3) coated with an adhesive resin on the back surface of the paper base material sheet (2). The correction tape of Patent Document 1 realizes writing properties similar to those of paper by making the correction tape itself made of paper.

[0003] Also, conventionally, as an applicator for such an adhesive correction tape, an applicator for an adhesive correction tape such as Patent Document 2 has been proposed. In an applicator for an adhesive correction tape such as that of Patent Document 2, since it is necessary to continuously feed out the adhesive correction tape to the attachment portion for attaching the adhesive correction tape to an adherent such as a document, it is necessary to store a long adhesive correction tape in the applicator so that it can be fed out. For this reason, in an applicator for an adhesive correction tape such as Patent Document 2, the adhesive correction tape is in the form of a pancake (roll) wound around a core (spool).

[0004] Also, in the applicator for the adhesive correction tape of Patent Document 2, a separator for covering the adhesive layer, which is a layer for attaching to an adherent, is not used. Using a separator would require a mechanism for peeling the separator from the adhesive layer in the applicator for the adhesive correction tape and a mechanism for discharging or storing the separator after peeling, which would make the applicator for the adhesive correction tape unduly large, so it is not preferable. Also, since the separator itself becomes waste after use, it is preferable not to use a separator.

[0005] However, if a correction tape like the one in Patent Document 1 is made into a pancake shape without using a separator in order to be stored in a correction tape applicator, the correction tape must be wound around the core with the paper base sheet (2) and the adhesive resin layer (3) facing each other. In this way, when the correction tape of Patent Document 1 is made into a pancake shape without using a separator, the paper surface and the adhesive resin layer (3) face each other, causing the adhesive resin layer (3) to stick to the paper surface. Therefore, when trying to unwind the correction tape from the pancake, there was a risk that the correction tape would not be able to be unwound from the pancake. Furthermore, even if the correction tape could be unwound from the pancake, there was a risk that the adhesive resin layer would be peeled off towards the paper surface, preventing the correction tape from sticking to the transfer surface, or that the paper surface would be peeled off towards the adhesive resin layer, causing the paper surface to tear (hereinafter, these phenomena will be referred to as blocking), thus rendering the correction tape unusable in a satisfactory state. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2005-103757 [Patent Document 2] Japanese Patent Publication No. 2015-142981 [Overview of the project] [Problems that the invention aims to solve]

[0007] The present invention has been made in view of the above circumstances, and the problem that the present invention aims to solve is to provide a correction adhesive tape that has good writability on the surface of the adherend including the correction adhesive tape after being attached to the adherend such as a document, and that does not cause blocking even when a separator is used to cover the adhesive surface when it is made into a pancake shape for storage in a correction adhesive tape applicator. [Means for solving the problem]

[0008] The first invention relates to a correction adhesive tape used by being attached to a substrate, wherein a white opaque layer and a release layer are laminated in this order from the substrate side on one surface of the substrate, and an adhesive layer is provided on the other surface of the substrate. The substrate is a PET film with a thickness of 10 μm or more and 15 μm or less, the white opacity layer contains a binder resin, a white pigment, a white extender pigment and / or silica, the total content of the white pigment, the white extender pigment and the silica in the solid content of the white opacity layer is 60 to 80% by weight, and the thickness of the white opacity layer is 20 μm or more and 25 μm or less, The release layer does not contain silicone resin. It consists of long-chain alkyl pendant-type polymers. The thickness of the release layer is 0.5μm or more and 1.5μm or less And, The adhesive layer is made of an acrylic adhesive, and the thickness of the adhesive layer is 2.0 μm or more and 6.0 μm or less. This is a repair adhesive tape characterized in that the adhesive strength of the adhesive layer, as measured by the measurement method described below, is 0.2 N / 25 mm or more and 1.0 N / 25 mm or less. (Adhesive force measurement method) A film in which only the adhesive layer is laminated on a 12 μm thick PET (polyethylene terephthalate) film is cut to a width of 25 mm and a length of 300 mm to prepare an adhesive strength test piece. Then, the adhesive layer side of the test piece is bonded to a specified stainless steel test plate as defined in JIS Z 0237, and the adhesive strength is measured by peeling it off at 180° in accordance with JIS Z 0237. [Effects of the Invention]

[0009] In this invention, a correction adhesive tape for use by attaching it to a substrate is provided, in which a white opaque layer and a release layer are laminated in this order from the substrate side on one surface of the substrate, and an adhesive layer is provided on the other surface of the substrate, the release layer is a silicone resin-free layer with a thickness of 0.1 μm to 2.0 μm, and the adhesive strength of the adhesive layer measured by a specific method is 0.2 N / 25 mm to 1.0 N / 25 mm, thereby ensuring good writing performance on the surface of the substrate including the correction adhesive tape after it has been attached to a substrate such as a document, and also providing a correction adhesive tape that does not block even when it is in a pancake shape without using a separator to cover the adhesive surface for storage in a correction adhesive tape applicator. [Brief explanation of the drawing]

[0010] [Figure 1] This figure shows the layer structure of repair adhesive tape A, which is an example of the repair adhesive tape of the present invention. [Modes for carrying out the invention]

[0011] The adhesive tape for correction according to the present invention will be described in more detail below.

[0012] As shown in Figure 1, the adhesive repair tape of the present invention is a repair tape in which at least a white opaque layer (2) and a release layer (3) are laminated on one surface of a base material (1) in this order from the base material (1) side, and an adhesive layer (4) is laminated on the other surface of the base material (1). The adhesive repair tape of the present invention may also have anchor layers, etc., between the white opaque layer (2) and the base material (1), and between the adhesive layer (4) and the base material (1), and the white opaque layer (2), release layer (3), and adhesive layer (4) may be laminated in multiple layers.

[0013] (base material) As the base material for the correction adhesive tape of the present invention, various plastic films commonly used as base materials for this type of adhesive tape can be used, including polyester films such as polyethylene terephthalate film and polyethylene naphthalate film, polycarbonate film, polyamide film, aramid film, and others. High-density thin paper such as condenser paper can also be used. When the correction adhesive tape of the present invention is applied to an object, it is preferable that there is little difference in height between the tape and the surface of the object, and the overall thickness of the correction adhesive tape is preferably thin. For this reason, among these exemplified materials, polyester film is preferred because sufficient mechanical strength can be obtained even when it is thin, and among polyester films, polyethylene terephthalate film (PET) is more preferred. The thickness of the base material is usually preferably 5.0 μm to 40.0 μm, and more preferably 10.0 μm to 15.0 μm. If the thickness of the base material is less than 5.0 μm, wrinkles are likely to occur when the correction adhesive tape is applied. On the other hand, when the substrate thickness exceeds 40.0 μm, the difference in height between the surface of the correction adhesive tape attached to the substrate and the surface of the transfer target becomes large, resulting in reduced writing performance.

[0014] (White opaque layer) In the correction adhesive tape of the present invention, it is preferable to have the release layer described later as the outermost layer after application to the adherend, and to provide a white opaque layer between the release layer and the substrate as a layer that is in direct contact with the release layer. Since the ink written on the release layer is absorbed and fixed by the white opaque layer, the writability of the correction adhesive tape can be improved by providing the release layer and the white opaque layer in direct contact.

[0015] The white opacity layer consists of at least a binder resin, a white pigment, and a white extender pigment. Silica may be used in conjunction with the white extender pigment, or in place of the white extender pigment, in the white opacity layer. As the binder resin used in the white opacity layer, urethane-based, vinyl-based, olefin-based, rubber-based resins, etc., can be used individually or in combination of two or more. In particular, a combination of a rubber-like resin and a glass-like resin is preferable because it provides a good balance of flexibility in the white opacity layer coating. As for the rubber-like resin, it is preferable to have flexibility even if it contains only a small amount of plasticizer. Examples include styrene-butadiene-styrene block copolymer (SBS), styrene-ethylene-butylene-styrene block copolymer (SEBS), styrene-butadiene rubber (SBR), styrene-isoprene-styrene block copolymer (SIS), urethane rubber, acrylonitrile-butadiene rubber, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, chlorosulfonated polyethylene, cyclized rubber, and other ordinary synthetic rubbers or elastomers, among which styrene-ethylene-butylene-styrene block copolymer (SEBS) or styrene-butadiene rubber (SBR) are preferred. Preferably, the glassy resin has low elongation, a melting or softening point of 100°C or higher, and high hardness. Examples include saturated or unsaturated alicyclic hydrocarbon resins or aliphatic hydrocarbon resins, styrene-acrylic copolymer resins, ketone resins, rosin, rosin derivatives, maleic acid derivatives, acrylic acid derivatives and other carboxyl group-containing resins, and polyolefin resins such as polyethylene and polypropylene. Among these, saturated or unsaturated alicyclic hydrocarbon resins or aliphatic hydrocarbon resins are preferred.

[0016] The content of the binder resin in the white hiding layer in the solid content of the white hiding layer is preferably 20 to 30% by weight, more preferably 23 to 28% by weight.

[0017] When a glassy resin and a rubbery resin are used in combination as the binder resin of the white hiding layer, the weight ratio is not particularly limited. However, with respect to 1 part by weight of the glassy resin, preferably 1.0 to 1.5 parts by weight, more preferably 1.1 to 1.3 parts by weight of the rubbery resin.

[0018] The white hiding layer contains a white pigment. The white pigment is not particularly limited as long as it is a white pigment capable of ensuring the hiding power required for the white hiding layer, and any of them can be used. Examples include titanium oxide, zinc oxide, etc. Among them, titanium oxide is preferable in that the whiteness of the tape can be increased with a small amount of addition. These may be used alone or in combination of two or more.

[0019] The particle size of the white pigment is not particularly limited, but for example, 0.2 to 0.3 μm, preferably 0.23 to 0.27 μm, in terms of the white hiding layer having good hiding power.

[0020] The white hiding layer in the present invention preferably contains a white extender pigment and / or silica in addition to the above white pigment. By using the white pigment and the white extender pigment and / or silica in combination, fine voids can be provided throughout the white hiding layer. Since fine voids are provided throughout the white hiding layer, the ink permeability when writing on the release layer with a writing instrument is improved. The white extender pigment is not particularly limited and any of them can be used. Examples include calcium carbonate, magnesium carbonate, barium carbonate, aluminum oxide, silica, celite, talc, clay, etc. Among them, calcium carbonate and magnesium carbonate are preferable. These may be used alone or in combination of two or more. Wet silica is preferable as the silica. The white extender pigment and silica can also be used in combination.

[0021] In the present invention, the total content of the white pigment, the white extender pigment and / or silica in the white hiding layer is 60 to 80% by weight, preferably 65 to 75% by weight. If it is less than 60% by weight, there is a risk that the hiding power will be insufficient or the appearance will be impaired. If it exceeds 80% by weight, the amount of the binder resin will be reduced and the strength cannot be maintained, and there is a risk that the white hiding layer will break during writing.

[0022] In addition to the binder resin, the white pigment, and the white extender pigment (and / or silica), the white hiding layer Within a range that does not inhibit various functions required for the white hiding layer, various additives may be contained. Examples of the additives include plasticizers, defoamers, surfactants, antioxidants, dispersants, tackifiers, and the like. For example, as the dispersant, any material that can disperse a white pigment such as titanium oxide in an organic solvent is not particularly limited, and known materials can be appropriately used. Further, as other additives, for example, for the purpose of improving the permeability of the aqueous ink when writing with a writing instrument using the aqueous ink after hiding or correcting typos, polyethylene glycol, polypropylene glycol, polyethylene glycol polypropylene glycol random copolymer, or polyethylene glycol polypropylene glycol block copolymer can be selected. The content of these other components is not particularly limited and may be appropriately designed according to the purpose.

[0023] The thickness of the white hiding layer is preferably 15 μm or more and 30 μm or less, more preferably 20 μm or more and 25 μm or less. If it is less than 15 μm, there is a risk that the hiding power will be insufficient. If it exceeds 30 μm, the overall thickness of the correction adhesive tape will increase, resulting in a large step between the end of the correction adhesive tape that hides and corrects typos and the surrounding area. When writing on the writing surface including the hidden and corrected part with the correction adhesive tape, there is a risk that the tip of the writing instrument will catch on the step, or when copying, the step will appear as a shadow.

[0024] The white opacity layer can be formed by dispersing or dissolving the above material in a suitable solvent to make a coating solution, applying it to a substrate by known means such as the roll coating method, reverse roll coating method, gravure coating method, reverse gravure coating method, bar coating method, and rod coating method to form a coating film, and then drying it.

[0025] (Release layer) In the correction adhesive tape of the present invention, a release layer is provided on a white opaque layer. The release layer of the present invention is a layer composed of a material that does not contain silicone resin. By providing a release layer that does not contain silicone resin, it is possible to prevent the adhesive layer from blocking the release layer and to achieve good writability on the release layer, which becomes the surface layer after it has been applied to the adhesive surface. Among materials that do not contain silicone resin, it is preferable to use a long-chain alkyl pendant type polymer as the main component of the release layer. By using a long-chain alkyl pendant type polymer as the main component of the release layer, it is possible to achieve both better prevention of the adhesive layer from blocking the release layer and better writability on the release layer, which becomes the surface layer after it has been applied to the adhesive surface.

[0026] Long-chain alkyl pendant polymers are polymers in which long-chain alkyl groups are present as pendant-like side chains in a main chain polymer. Examples include homopolymers of vinyl monomers or (meth)acrylate monomers having long-chain alkyl groups, copolymers with other copolymerizable vinyl monomers, and reaction products obtained by reacting active hydrogen polymers such as vinyl alcohol, ethylene-vinyl alcohol copolymers, polyethyleneimine, and hydroxyl group-containing cellulose derivatives with monofunctional isocyanates having long-chain alkyl groups.

[0027] The long-chain alkyl group in the long-chain alkyl pendant polymer is preferably linear, and the number of carbon atoms in the long-chain alkyl group is preferably in the range of 14 to 22, and more preferably in the range of 14 to 18. If the number of carbon atoms in the long-chain alkyl group is within the above range, it is possible to more reliably achieve both the prevention of blocking of the adhesive layer to the release layer and good writability on the release layer, which becomes the surface layer after application to the adhesive surface.

[0028] The weight-average molecular weight (Mw) of the long-chain alkyl pendant-type polymer is preferably in the range of 120,000 to 300,000, and more preferably in the range of 150,000 to 250,000. When the weight-average molecular weight (Mw) is within this range, the film strength of the release layer increases, and blocking can be reliably prevented. Furthermore, when the weight-average molecular weight (Mw) is within this range, solubility in the coating solution can be ensured, and productivity is also good. Note that the weight-average molecular weight (Mw) is the polystyrene equivalent value measured by gel permeation chromatography (GPC).

[0029] The thickness of the release layer is preferably 0.1 μm to 2.0 μm, and more preferably 0.5 μm to 1.5 μm. If the thickness of the release layer is less than 0.1 μm, the blocking prevention performance of the release layer against the adhesive layer decreases, and the adhesive layer may block the release layer. On the other hand, if the thickness of the release layer exceeds 2.0 μm, the writeability on the release layer deteriorates, and sufficient writeability cannot be ensured.

[0030] The release layer can be formed by dispersing or dissolving the above material in a suitable solvent to make a coating solution, and applying it to the substrate or a lower layer by known means such as the roll coating method, reverse roll coating method, gravure coating method, reverse gravure coating method, bar coating method, and rod coating method to form a coating film, and then drying it.

[0031] The release layer may contain various additives, as long as they do not impair the various functions required of the release layer. Examples of such additives include plasticizers, defoamers, surfactants, antioxidants, and dispersants.

[0032] (Adhesive layer) The adhesive repair tape of the present invention has an adhesive layer on the other side of a substrate that has a white opaque layer and a release layer. The adhesive layer is a layer that adheres to the substrate when the repair tape is applied to the substrate, thereby bonding the repair tape to the substrate.

[0033] The adhesive layer of the present invention is an adhesive layer having an adhesive strength in the range of 0.2 N / 25 mm to 1.0 N / 25 mm. In the present invention, the adhesive strength is measured by preparing an adhesive strength test piece by cutting a film, on which only the adhesive layer is laminated on a 12 μm thick PET film, to a width of 25 mm and a length of 300 mm, and then attaching the adhesive layer side of the test piece to a predetermined stainless steel test plate and measuring the adhesive strength by peeling it off at 180° in accordance with JIS Z 0237. If the adhesive strength of the adhesive layer is less than 0.2 N / 25 mm, sufficient adhesion to the substrate cannot be obtained, and there is a risk that the correction adhesive tape may lift off or peel off the substrate after being attached to the substrate. On the other hand, if the adhesive strength of the adhesive layer exceeds 1.0 N / 25 mm, there is a risk that the adhesive layer will block against the release layer.

[0034] As the adhesive used in the adhesive layer of the present invention, for example, acrylic resin-based, rosin-based, rubber-based, vinyl ether resin-based, and polyisobutylene-based adhesives can be used, but among these, acrylic resin-based adhesives are preferred because they allow for easy adjustment of the adhesive strength of the adhesive layer. Furthermore, among acrylic adhesives, re-peelable acrylic adhesives are preferred. Re-peelability means that after adhering to a substrate, it can be easily peeled off with almost no adhesive residue left on the substrate, and even if some adhesive residue remains on the substrate after peeling, it can be peeled off with only a small amount of adhesive remaining on the substrate so that the peeled adhesive layer can be reliably reattached to the substrate.

[0035] By using a repositionable acrylic adhesive, it is easy to achieve both good adhesion to the substrate surface and resistance to blocking. Furthermore, by using a repositionable acrylic adhesive, it is possible to easily peel it off the substrate immediately after application and reattach it, thus easily correcting application errors. Moreover, by using a repositionable acrylic adhesive, the adhesive strength of the adhesive layer to the substrate increases over time after application, ensuring sufficient adhesion to the substrate. Examples of repositionable acrylic adhesives include adhesives whose main component is an emulsion obtained by emulsion polymerization of monomer components containing acrylic monomers, but the adhesive is not limited to this. Any repositionable acrylic adhesive with an adhesive strength in the range of 0.2 N / 25 mm to 1.0 N / 25 mm can be suitably used as the adhesive layer.

[0036] When using an emulsion obtained by emulsion polymerization of a monomer component containing an acrylic monomer in the adhesive layer of the present invention, it is preferable that the polymer in the emulsion be a homopolymer of an acrylic monomer or a copolymer of an acrylic monomer and another copolymerizable monomer.

[0037] For producing the emulsion, alkyl acrylates, alkoxyalkyl acrylates, and the like can be used as acrylic monomers, and these monomers can be used individually or in combination of two or more. Examples of alkyl acrylates include methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, octyl acrylate, and isononyl acrylate, while examples of alkoxyalkyl acrylates include 2-methoxyethyl acrylate, 2-ethoxyethyl acrylate, and 2-butoxyethyl acrylate. These acrylic monomers can be used individually or in combination of two or more.

[0038] Furthermore, in addition to the acrylic monomers described above, monomers copolymerizable with the acrylic monomers can also be used as monomer components, if necessary. By using monomers copolymerizable with acrylic monomers, it is possible to adjust the Tg of the resin component and improve the static stability and mechanical stability of the emulsion.

[0039] The thickness of the adhesive layer after drying is preferably between 2.0 μm and 6.0 μm. If the thickness of the adhesive layer after drying is less than 2.0 μm, sufficient adhesive strength to the substrate will not be obtained, and there is a risk that the correction adhesive tape may lift off or peel off the substrate after application. On the other hand, if the thickness of the adhesive layer after drying exceeds 6.0 μm, the adhesive strength of the adhesive layer will increase excessively, and there is a risk that the adhesive layer will block against the release layer.

[0040] The adhesive layer can be formed by applying and drying an organic solvent solution, organic solvent dispersion, aqueous solution, or aqueous dispersion (including emulsion) of the adhesive directly to the substrate or via another layer. In the case of an aqueous solution or aqueous dispersion, a wetting agent or surfactant may be added.

[0041] The adhesive layer can be formed by applying and drying an organic solvent solution, organic solvent dispersion, aqueous solution, or aqueous dispersion (including emulsion) of a resin to a predetermined thickness using conventional coating methods such as roll coating, bar coating, gravure coating, air knife coating, or reverse coating.

[0042] The adhesive layer may contain various additives, as long as they do not interfere with the various functions required of the adhesive layer. Examples of such additives include plasticizers, defoamers, surfactants, antioxidants, dispersants, tackifiers, and inorganic / organic fine particles.

[0043] (Examples) The present invention is illustrated in the following examples. Reference example,The present invention will be explained in more detail using comparative examples. However, the present invention is not limited by these examples. Hereinafter, when the proportions of each material are indicated as parts, unless otherwise specified, this refers to parts by weight.

[0044] ( Reference example 1 ) (White opaque layer) A white opacity coating liquid, prepared by mixing the materials according to the following formulation, was applied to a 12.0 μm thick PET film used as a substrate, and dried to produce a white opacity layer with a drying thickness of 22.0 μm. (Coating liquid for white opacity layer) Hydrocarbon resin (alicyclic type) (100% solids content) 4.57 parts by weight Styrene-butadiene copolymer (100% solids) 5.55 parts by weight Dispersant (40% solids content) 2.01 parts by weight Titanium dioxide (average particle size 0.23 μm, 100% solids) 20.73 parts by weight Wet-processed silica (average particle size 1.5 μm, 100% solids content) 8.25 parts by weight Toluene 58.86 parts by weight

[0045] (Release layer) A release layer was prepared by kneading the materials according to the following formulation, and then applying the release layer coating liquid 1 onto a white opacity layer to a thickness of 0.1 μm after drying, and drying it to create a release layer. (Long-chain alkyl pendant polymer 1) As the long-chain alkyl pendant polymer 1, an emulsion solution of a long-chain alkyl pendant polymer (weight-average molecular weight 250,000), which is the reaction product of an ethylene-vinyl alcohol copolymer with an ethylene content of 45 mol% and a long-chain alkyl isocyanate having a linear alkyl group with 18 carbon atoms, was prepared. This emulsion solution was then dispersed in a solution containing water and IPA in the proportions shown in the following formulation to prepare a release layer coating solution 1. (Release layer coating liquid 1) Emulsion solution of long-chain alkyl pendant polymer 1 (solids content 15%) 3.33 parts by weight Water 47.50 parts by weight IPA 47.50 parts by weight

[0046] (Adhesive layer) The adhesive layer coating liquid A, prepared by mixing the materials according to the following formulation, is dried to a thickness of 4.0 μm to create an adhesive layer. Reference example 1 We manufactured a raw material sheet for the adhesive tape used for repairs. (Coating liquid A for adhesive layer) Licabond AP-620 (manufactured by Japan Coating Resin Co., Ltd.) 50.00 parts by weight Water 50.00 parts by weight

[0047] Reference example 1 The raw sheet of the repair adhesive tape is cut into 12mm wide strips, and with a tension of 40mN / mm width applied along the longitudinal direction of the raw sheet of repair adhesive tape, 20m of the tape is wound onto a 17mm outer diameter plastic core with the adhesive layer facing inward. Reference example 1 I obtained adhesive tape for repair.

[0048] (Example 2) Except for changing the post-drying thickness of the release layer to 1.0 μm, Reference example 1 The repair adhesive tape of Example 2 was obtained using the same method as the repair adhesive tape of Example 1.

[0049] ( Reference example 3 ) Except for changing the post-drying thickness of the release layer to 2.0 μm, Reference example 1 In the same way as with the adhesive tape used for repairs, Reference example 3 I obtained adhesive tape for repair.

[0050] (Example 4) Except for using the release layer coating liquid 2 described below as the release layer coating liquid and changing the thickness of the release layer after drying to 0.5 μm, Reference example 1 Using a similar method, the corrective adhesive tape of Example 4 was obtained. (Long-chain alkyl pendant polymer 2) As the long-chain alkyl pendant polymer 2, a solution was prepared by dispersing a long-chain alkyl pendant polymer (weight-average molecular weight of 200,000), which is a copolymer of octadecyl acrylate and vinyl acetate (octadecyl acrylate content of 50 mol%), in an organic solvent. Then, a release layer coating solution 2 was prepared by dispersing the long-chain alkyl pendant polymer in a solution to which toluene was added in the proportions shown in the following formulation. (Release layer coating liquid 2) Long-chain alkyl pendant polymer solution (18% solids): 50.00 parts by weight Toluene 50.00 parts by weight

[0051] (Example 5) The repair adhesive tape of Example 5 was obtained in the same manner as the repair adhesive tape of Example 4, except that the thickness of the release layer after drying was changed to 1.0 μm.

[0052] ( Reference example 6 ) Except for changing the thickness of the release layer after drying to 2.0 μm, the method was the same as for the adhesive tape for correction in Example 4. Reference example 6 I obtained adhesive tape for repair.

[0053] (Example 7) Except for changing the post-drying thickness of the release layer to 0.5 μm and the post-drying thickness of the adhesive layer to 2.0 μm, Reference example 1 The repair adhesive tape of Example 7 was obtained using the same method as the repair adhesive tape of Example 1.

[0054] (Example 8) Except for changing the post-drying thickness of the release layer to 0.5 μm and the post-drying thickness of the adhesive layer to 6.0 μm, Reference example 1 The repair adhesive tape of Example 8 was obtained using the same method as the repair adhesive tape of Example 1.

[0055] ( Reference example 9 ) A PET film with a thickness of 6.0 μm was used as the base material, and the thickness of the release layer after drying was changed to 0.5 μm. Reference example 1 In the same way as with the adhesive tape used for repairs, Reference example 9I obtained adhesive tape for repair.

[0056] ( Reference example 10 ) A PET film with a thickness of 19.0 μm was used as the base material, and the thickness of the release layer after drying was changed to 0.5 μm. Reference example 1 In the same way as with the adhesive tape used for repairs, Reference example 10 I obtained adhesive tape for repair.

[0057] ( Reference example 11 ) A PET film with a thickness of 25.0 μm was used as the base material, and the thickness of the release layer after drying was changed to 0.5 μm. Reference example 1 In the same way as with the adhesive tape used for repairs, Reference example 11 I obtained adhesive tape for repair.

[0058] ( Reference example 12 ) A PET film with a thickness of 38.0 μm was used as the base material, and the thickness of the release layer after drying was changed to 0.5 μm. Reference example 1 In the same way as with the adhesive tape used for repairs, Reference example 12 I obtained adhesive tape for repair.

[0059] (Comparative Example 1) Except for changing the post-drying thickness of the release layer to 0.05 μm, Reference example 1 A correction adhesive tape for Comparative Example 1 was obtained using the same method as for the correction adhesive tape described above.

[0060] (Comparative Example 2) Except for changing the post-drying thickness of the release layer to 3.0 μm, Reference example 1 A correction adhesive tape for Comparative Example 2 was obtained using the same method as for the correction adhesive tape for Comparative Example 1.

[0061] (Comparative Example 3) The adhesive tape for Comparative Example 3 was obtained in the same manner as the adhesive tape for correction in Example 4, except that the thickness of the release layer after drying was changed to 0.05 μm.

[0062] (Comparative Example 4) The corrective adhesive tape of Comparative Example 4 was obtained in the same manner as the corrective adhesive tape of Example 4, except that the thickness of the release layer after drying was changed to 3.0 μm.

[0063] (Comparative Example 5) Except for the fact that the release layer coating liquid 3, prepared by kneading the materials of the following formulation, was applied to the white opacity layer and dried to a thickness of 0.2 μm after drying, a release layer was prepared, Reference example 1 A correction adhesive tape for Comparative Example 5 was obtained using the same method as for the correction adhesive tape mentioned earlier. (Release layer coating liquid 3) Silicone resin (30% solids content) 20.00 parts by weight Platinum catalyst (solid content 2%) 0.20 parts by weight Toluene 80.00 parts by weight

[0064] (Comparative Example 6) Except for the fact that the release layer coating liquid 4, prepared by kneading the materials of the following formulation, was applied to the white opacity layer and dried to a thickness of 0.1 μm after drying, a release layer was prepared, Reference example 1 A correction adhesive tape for Comparative Example 6 was obtained using the same method as for the correction adhesive tape described above. (Release layer coating liquid 4) Fluorosilicone resin (30% solids content) 20.00 parts by weight Platinum catalyst (solid content 2%) 0.20 parts by weight Toluene 80.00 parts by weight

[0065] (Comparative Example 7) Except for changing the post-drying thickness of the release layer to 0.5 μm and the post-drying thickness of the adhesive layer to 1.0 μm, Reference example 1 A correction adhesive tape for Comparative Example 7 was obtained using the same method as for the correction adhesive tape described above.

[0066] (Comparative Example 8) Except for changing the post-drying thickness of the release layer to 0.5 μm and the post-drying thickness of the adhesive layer to 7.0 μm, Reference example 1 A correction adhesive tape for Comparative Example 8 was obtained using the same method as for the correction adhesive tape described above.

[0067] (Comparative Example 9) Except for changing the post-drying thickness of the release layer to 0.5 μm and using adhesive coating liquid B prepared by kneading the materials according to the following formulation to create an adhesive layer with a post-drying thickness of 6.0 μm, Reference example 1 A correction adhesive tape for Comparative Example 9 was obtained using the same method as for the correction adhesive tape described above. (Coating liquid for adhesive layer B) Olivine BPW6560 (manufactured by Toyo Chem Co., Ltd.) 50.00 parts by weight Water 50.00 parts by weight

[0068] (Comparative Example 10) Except for changing the post-drying thickness of the release layer to 0.5 μm and using adhesive coating liquid C prepared by kneading the materials according to the following formulation to create an adhesive layer with a post-drying thickness of 2.0 μm, Reference example 1 A correction adhesive tape for Comparative Example 10 was obtained using the same method as for the correction adhesive tape mentioned earlier. (Coating liquid for adhesive layer C) Nikazol TS-1979 (manufactured by Nippon Carbide Industries Co., Ltd.) 50.00 parts by weight Water 50.00 parts by weight

[0069] (evaluation) Each embodiment, Reference example, The correction adhesive tape prepared in the comparative example was evaluated as follows. (1) Writability evaluation 1 (ink absorption) First, each example, Reference example, A piece of correction tape from the comparative example was cut to a length of 200 mm. The adhesive side of the correction tape was placed on top of a sheet of PPC paper, and a load of 1000 gf was applied for 10 seconds to adhere the correction tape to the PPC paper. Three spirals were drawn on the release layer of the attached correction tape using a water-based ballpoint pen (PILOT Vcorn) with a tip ball diameter of 0.5 mm, with a writing load of 160 gf. Five seconds after writing, the lines were traced over with a finger. The condition of the drawn lines after tracing was visually observed and evaluated according to the following criteria. The evaluation results are shown in Tables 1 and 2. Inferior ×-○-◎ Excellent ○ and above are in the practical realm. ◎: The ink has been absorbed, and there is no smudge on the spiral. ○: A small amount of unabsorbed ink remains, and slight staining is visible on the spiral. ×: A large amount of unabsorbed ink remains, making the spiral visibly dirty.

[0070] (2) Writability evaluation 2 (leveling) First, each example, Reference example, A 200mm length of correction tape was cut from the comparative example. The adhesive side of the correction tape was placed on top of a sheet of PPC paper, and a load of 1000gf was applied for 10 seconds to adhere the correction tape to the PPC paper. The side of the PPC paper with the correction tape attached was copied using a Canon C5240 office multifunction printer. The settings of the office multifunction printer for copying were: Color selection: Automatic (color / black and white), Magnification: 1:1, Density: Center (standard), Document type: Text / Photo. PPC paper was also used for copying. The condition of the area corresponding to the edge of the correction tape on the copied paper was visually observed and evaluated according to the following criteria. Visual observation was performed in a room with a three-wavelength fluorescent lamp, with an illuminance of 650-850 lux on the PPC paper surface, and observed from a distance of 0.2m from the PPC paper. The evaluation results are shown in Tables 1 and 2. Inferior ×-○-◎ Excellent ○ and above are in the practical realm. ◎: The end portion of the correction adhesive tape cannot be identified. ○: A small portion corresponding to the end of the correction adhesive tape can be seen, but the thickest part is visible. When viewed with a magnifying glass with a 10x magnification and a minimum measurement scale of 0.1 mm, the The width is less than 0.2 mm. ×: The portion corresponding to the end of the correction adhesive tape is clearly a line. Cut.

[0071] (3) Writability rating: 3 (wrinkles, tears) Each embodiment, Reference example,A 200mm length of correction tape was cut, and the adhesive side of the correction tape was placed on top of a sheet of PPC paper. A load of 1000gf was applied for 10 seconds to adhere the correction tape to the PPC paper. Using a Mitsubishi Pencil JET STREAM φ0.50 oil-based ballpoint pen, a load of 500gf was applied to the pen tip, and spiral writing was performed in an area extending beyond both ends of the correction tape in the width direction (an area wider than the width of the correction tape). During spiral writing, the presence or absence of wrinkles and tears in the correction tape caused by the tip of the oil-based ballpoint pen catching on the ends of the correction tape was visually observed and evaluated according to the following criteria. The evaluation results are shown in Tables 1 and 2. Inferior ×-○-◎ Excellent ○ and above are in the practical realm. ◎: No wrinkles or tears were found in the correction tape. ○: Slight wrinkles appear on the correction adhesive tape. ×: Wrinkles and / or tears may occur in the correction adhesive tape.

[0072] (4)Removability Each embodiment, Reference example, A roll of correction tape for the comparative example was prepared. The correction tape was cut from the roll to a width of 16 mm and a length of 50 mm. The adhesive side of the correction tape was then placed on top of the PPC paper, and a load of 1000 gf was applied for 10 seconds to press the correction tape to the PPC paper. Immediately after pressing, 10 mm of the correction tape was peeled off from the longitudinal end to create a tab. The tab was grasped, and the correction tape was peeled off the PPC paper longitudinally at a speed of 50 cm / sec. The condition of the PPC paper after peeling was visually observed and evaluated according to the following criteria. The evaluation results are shown in Tables 1 and 2. Inferior ×-○-◎ Excellent ○ and above are in the practical realm. ◎: The correction tape peeled off without leaving any adhesive residue on the PPC paper. ○: Although an adhesive layer remains on the PPC paper, the correction tape peels off without damaging the paper, and the peeled correction tape can be reattached to the PPC paper without lifting. ×: The PPC paper peeled off.

[0073] (5) Adhesion to paper Each embodiment, Reference example, A raw sheet of the correction adhesive tape for the comparative example was prepared. The correction adhesive tape was cut from the raw sheet to a width of 16 mm and a length of 50 mm. The adhesive side of the correction adhesive tape was then placed on a 100 mm (vertical) x 100 mm (horizontal) piece of PPC paper, and a load of 1000 gf was applied for 10 seconds to press the correction adhesive tape to the PPC paper. The position where the correction adhesive tape was pressed (attached) was such that one end of the correction adhesive tape was aligned with the center of the vertical and horizontal sides of the PPC paper, and the correction adhesive tape was attached along the vertical center of the PPC paper. Immediately after pressing, the correction adhesive tape was peeled 10 mm from the edge of the PPC paper to create a tab. The tab was grasped and lifted 50 cm in the opposite direction of gravity at a speed of 50 mm / sec. The adhesion state of the correction adhesive tape to the PPC paper was visually checked and evaluated according to the following criteria. The evaluation results are shown in Tables 1 and 2. Inferior ×-○-◎ Excellent ○ and above are in the practical realm. ◎: The adhesive tape for corrections does not peel off the PPC paper, and the PPC paper does not peel off. It is possible to do so. ○: Although peeling occurs at the point where the correction adhesive tape and the PPC paper are attached, the PPC paper can still be lifted. ×: Unable to lift the PPC paper to the specified height.

[0074] (6) Long-term fixation to paper Each embodiment, Reference example, A raw sheet of the comparative example correction adhesive tape was prepared. The correction adhesive tape was cut from the raw sheet to a width of 16 mm and a length of 50 mm. The adhesive layer side of the correction adhesive tape was placed on top of the PPC paper, and a load of 1000 gf was applied for 10 seconds to press the correction adhesive tape to the PPC paper. After pressing, it was left for one week, and then 10 mm of the correction adhesive tape was peeled off from the longitudinal end to create a tab. The tab was grasped, and the correction adhesive tape was peeled off from the PPC paper in the longitudinal direction at a speed of 50 cm / sec. The condition of the PPC paper after peeling was visually observed and evaluated according to the following criteria. The evaluation results are shown in Tables 1 and 2. Inferior ×-○-◎ Excellent ○ and above are in the practical realm. ◎: The PPC paper tore. ○: The PPC paper peeled off. ×: The PPC paper did not peel off, but the correction adhesive tape detached.

[0075] (7) Blocking resistance evaluation Each embodiment, Reference example, The comparative example's repair adhesive tape was stored in an environment of 45°C and 85% RH for 4 days. After being left at room temperature and humidity for 24 hours, the repair adhesive tape was pulled out from the plastic core at a speed of 6 m / min in the tangential direction of the outer circumference of the roll-shaped portion of the repair adhesive tape, without applying brake torque to the core. After pulling out the full length of 20 m of repair adhesive tape, both the adhesive layer and the release layer were observed visually and tactilely along the entire length of the repair adhesive tape and evaluated according to the following criteria. The evaluation results are shown in Tables 1 and 2. Inferior ×-○-◎ Excellent ○ and above are in the practical realm. ◎: Blocking of the adhesive layer to the release layer could not be confirmed. ○: Blocking of the adhesive layer to the release layer could not be confirmed, but there were some rough areas on the release layer. ×: Blocking of the adhesive layer against the release layer was visually confirmed.

[0076] (8) Adhesive layer adhesive strength To confirm the difference in adhesive strength due to differences in adhesive type and adhesive layer thickness, seven types of test specimens shown in Table 3 were prepared. The test specimens were made by laminating only the adhesive layer onto a 12 μm thick PET film and cutting it to a width of 25 mm and a length of 300 mm. For adhesive strength measurement, the adhesive layer side of each test specimen was bonded to a specified stainless steel test plate as defined in JIS Z 0237, and the adhesive strength was measured by peeling it off at 180° in accordance with JIS Z 0237. The evaluation results are shown in Table 3.

[0077] (Table 1) TIFF0007905167000001.tif83140

[0078] (Table 2) TIFF0007905167000002.tif83146

[0079] (Table 3) TIFF0007905167000003.tif104143 [Explanation of symbols]

[0080] 1...Base material 2…White opaque layer 3…Release layer 4…adhesive layer A... Correction adhesive tape

Claims

[Claim 1] In a correction adhesive tape used by being attached to a substrate, a white opaque layer and a release layer are laminated in this order from the substrate side on one surface of the substrate, and an adhesive layer is provided on the other surface of the substrate, the substrate is a PET film with a thickness of 10 μm or more and 15 μm or less, and the white opaque layer is A correction adhesive tape characterized by containing a binder resin, a white pigment, a white extender pigment and / or silica, wherein the total content of the white pigment, the white extender pigment and the silica in the white opaque layer solids is 60 to 80% by weight, the thickness of the white opaque layer is 20 μm or more and 25 μm or less, the release layer does not contain silicone resin and is made of a long-chain alkyl pendant type polymer and the thickness of the release layer is 0.5 μm or more and 1.5 μm or less, the adhesive layer is made of an acrylic adhesive and the thickness of the adhesive layer is 2.0 μm or more and 6.0 μm or less, and the adhesive strength of the adhesive layer measured by the following measurement method is 0.2 N / 25 mm or more and 1.0 N / 25 mm or less. (Adhesive force measurement method) A film in which only the adhesive layer is laminated on a 12 μm thick PET (polyethylene terephthalate) film is cut to a width of 25 mm x length of 300 mm to prepare an adhesive strength test piece. Then, the adhesive layer side of the test piece is bonded to a predetermined stainless steel test plate specified in JIS Z 0237, and the adhesive strength is measured by peeling it off at 180° in accordance with JIS Z 0237.

Images