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, 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, and is re-peelable even with the lapse of time.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, the adhesive layer is composed of a silicone-based adhesive, 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

[0005] ,

[0004] , , , , ,

[0003]

[0001] The present invention relates to an adhesive tape for correction that is attached to an adherent such as a document to correct characters or the like on the document or the like. Specifically, the present invention relates to an adhesive tape for correction that can write characters on its own surface after being attached to a document or the like and has re-peelability over time.

Background Art

[0002] Conventionally, various tapes have been proposed as such adhesive tapes for correction. For example, in Patent Document 1, a correction tape is proposed that is characterized in that a correction tape main body (1) is composed of a paper-based paper substrate sheet (2) and an adhesive resin layer (3) coated with an adhesive resin on the back surface of the paper substrate sheet (2). The correction tape of Patent Document 1 realizes the same writing property as paper by making the correction tape itself made of paper.

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

[0004] Also, in the applicator for an adhesive tape for correction of Patent Document 2, a separator that covers the adhesive layer, which is the layer for attaching to the adherent, is not used. Using a separator requires a mechanism for peeling the separator from the adhesive layer in the applicator for the adhesive tape for correction and a mechanism for discharging or storing the separator after peeling, which makes the applicator for the adhesive tape for correction larger than necessary, 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.

[0006] Furthermore, with conventional correction adhesive tapes, the adhesive strength of the adhesive layer against the substrate increases over time after application. If you notice a mistake in application and try to correct it, it is possible to reapply the tape immediately after application, but if time has passed since application, the adhesive strength increases, making reapplication impossible. [Prior art documents] [Patent Documents]

[0007] [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]

[0008] 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 can be re-peeled over time without blocking occurring, 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]

[0009] 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 to 15 μm, 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 white opacity layer is 60 to 80% by weight, and the thickness of the white opacity layer is 20 μm to 25 μm. The aforementioned release layer does not contain silicone resin, It consists 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. Furthermore, the adhesive layer is made of a silicone-based adhesive. The thickness of the adhesive layer is 2.0 μm or more and 20 μm or less. A correction adhesive tape characterized in that the adhesive strength of the adhesive layer, measured by the measurement method described below, is 0.2 N / 25 mm or more and 1.0 N / 25 mm or less. That is . (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]

[0010] 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 layer is a layer made of a silicone-based adhesive with an adhesive strength of 0.2 N / 25 mm to 1.0 N / 25 mm as measured by a specific method, thereby ensuring good writing properties on the surface of the substrate including the correction adhesive tape after it has been attached to a substrate such as a document, and providing a correction adhesive tape that can be re-peeled over time without blocking occurring 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]

[0011] [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]

[0012] The adhesive tape for correction according to the present invention will be described in more detail below.

[0013] 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.

[0014] (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 material being transferred becomes large, resulting in reduced writing performance.

[0015] (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.

[0016] 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.

[0017] The content of the binder resin in the white opacity layer's solid content is preferably 20-30% by weight, more preferably 23-28% by weight.

[0018] 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, but 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.

[0019] 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.

[0020] 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.

[0021] The white hiding layer in the present invention preferably contains, in addition to the above white pigment, a white extender pigment and / or silica. 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.

[0022] In the present invention, the total content of white pigment, white extender pigment, and / or silica in the white opacity layer solids is 60 to 80% by weight, preferably 65 to 75% by weight. If it is less than 60% by weight, the opacity may be insufficient or the appearance may be impaired, and if it exceeds 80% by weight, the amount of binder resin will be insufficient, making it difficult to maintain strength, and the white opacity layer may tear when writing.

[0023] The white opacity layer may contain various additives in addition to the binder resin, white pigment, and white extender pigment (and / or silica), as long as they do not hinder the various functions required of the white opacity layer. Examples of such additives include plasticizers, defoamers, surfactants, antioxidants, dispersants, and tackifiers. For example, the dispersant is not particularly limited as long as it can disperse white pigments such as titanium dioxide in an organic solvent, and known dispersants can be used as appropriate. Other additives that can be selected include, for example, polyethylene glycol, polypropylene glycol, polyethylene glycol polypropylene glycol random copolymer, or polyethylene glycol polypropylene glycol block copolymer, for the purpose of concealing typographical errors and improving the penetration of water-based ink when writing with a writing instrument that uses water-based ink after correction. The content of these other components is not particularly limited and can be appropriately designed according to the purpose.

[0024] The thickness of the white opacity layer is preferably 15 μm to 30 μm, and more preferably 20 μm to 25 μm. If it is less than 15 μm, the opacity may be insufficient, and if it exceeds 30 μm, the overall thickness of the correction adhesive tape will increase, resulting in a larger step between the edge of the correction adhesive tape that has concealed and corrected the typographical error and the surrounding area. This may cause problems such as the tip of the writing instrument catching on the step when writing on a writing surface that includes the concealed and corrected part of the correction adhesive tape, or the step appearing as a shadow when a copy is made.

[0025] 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.

[0026] (Release layer) The correction adhesive tape of the present invention has a release layer 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 polymer as the main component of the release layer. By using a long-chain alkyl pendant 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 good writability on the release layer, which becomes the surface layer after it has been applied to the adhesive surface.

[0027] 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.

[0028] 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.

[0029] 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).

[0030] 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.

[0031] 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.

[0032] 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.

[0033] (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.

[0034] The adhesive layer of the present invention is made of a silicone-based adhesive and has an adhesive strength in the range of 0.2 N / 25 mm to 1.0 N / 25 mm. The adhesive strength in the present invention is measured by preparing an adhesive strength test piece by laminating only the adhesive layer on a 12 μm thick PET film, cutting the film to a width of 25 mm and a length of 300 mm, and then bonding 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 applied 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.

[0035] Silicone-based adhesives having the aforementioned range of adhesive strength exhibit excellent re-peelability, and even after time has passed since application to the substrate, the adhesive strength of the adhesive layer to the substrate does not easily increase, thus maintaining re-peelability. Re-peelability refers to the property of being able to be easily peeled off the substrate with little to no adhesive residue after initial adhesion. Even if some adhesive residue remains on the substrate after peeling, it is possible to peel it off with only a small amount of adhesive residue remaining, so that the peeled adhesive layer can be reliably reattached to the substrate.

[0036] By using a silicone-based adhesive with excellent repositioning properties, it is easy to achieve both good adhesion to the substrate surface and resistance to blocking. Furthermore, even after time has passed since application to the substrate, the adhesive strength of the adhesive layer does not easily increase, making it easy to correct application errors. As a repositionable silicone-based adhesive, an addition-curing type silicone-based adhesive that can be cured at a relatively low temperature of around 80°C to 130°C is preferred, but it is not limited to this. Any silicone-based adhesive with an adhesive strength in the range of 0.2 N / 25 mm to 1.0 N / 25 mm can be used for the adhesive layer.

[0037] When using an addition-curing silicone adhesive in the adhesive layer of the present invention, there are no particular restrictions on the addition-curing silicone adhesive. For example, an addition-curing silicone adhesive can be appropriately selected from conventionally known addition-curing silicone adhesives, such as one containing a silicone rubber or silicone resin mainly composed of organopolysiloxane, to which a hydrosilyl group (SiH group) crosslinking agent and a curing catalyst used as needed are added.

[0038] Examples of addition-curing silicone adhesives include KR-3700, KR-3701, X-40-3237, X-40-3240, X-40-3291-1, KR-3704, X-40-3323, X-40-3270-1, X-40-3306, etc. from Shin-Etsu Chemical Co., Ltd., and SD4580PSA, SD4584PSA, SD4585PSA, SD4587LPSA, SD4560PSA, SD4570PSA, SD4600FCAdhesive, 7646Adhesive, LTC755Coating, etc. from Dow Toray Industries, Inc. These can be mixed in combination to adjust the adhesive strength of the adhesive layer to the appropriate level.

[0039] As the curing catalyst for the aforementioned addition-curing silicone adhesive, platinum-based catalysts can be suitably used. Examples include chloroplatinic acid, an alcoholic solution of chloroplatinic acid, a reaction product of chloroplatinic acid and an alcoholic solution, a reaction product of chloroplatinic acid and an olefin compound, a reaction product of chloroplatinic acid and a vinyl group-containing siloxane compound, platinum-olefin complexes, platinum-vinyl group-containing siloxane complexes, and platinum-phosphorus complexes. Examples include PL-50T manufactured by Shin-Etsu Chemical Co., Ltd. and SRX-212 manufactured by Dow-Toray Industries, Inc.

[0040] The thickness of the adhesive layer after heat drying is preferably 2.0 μm or more and 20.0 μm or less. If the thickness of the adhesive layer after heat drying is less than 2.0 μm, sufficient adhesive strength to the substrate cannot be obtained, and there is a risk that the correction tape may lift away from the substrate or peel off after being applied to the substrate. On the other hand, if the thickness of the adhesive layer after heat drying exceeds 20.0 μm, the overall thickness of the correction tape becomes thicker, which increases the step between the edge of the correction tape used to conceal or correct errors and the surrounding area. This may cause problems such as the tip of the writing instrument catching on the step when writing on a writing surface that includes the concealed or corrected area, or the step appearing as a shadow when a copy is made.

[0041] The adhesive layer can be formed by applying an organic solvent solution or dispersion of the adhesive to the substrate directly or via another layer, followed by heating and drying.

[0042] The adhesive layer can be formed by applying an organic solvent solution or dispersion of an adhesive to a predetermined thickness using conventional coating methods such as roll coating, bar coating, gravure coating, air knife coating, or reverse coating, followed by heat drying.

[0043] 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, and tackifiers.

[0044] (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.

[0045] ( 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 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) (100% solids) 4.57 parts Styrene-butadiene copolymer (100% solids) 5.55 parts Dispersant (40% solids content) 2.01 parts Titanium dioxide (average particle size 0.23 μm, solid content 100%) 20.73 parts Wet-processed silica (average particle size 1.5 μm, 100% solids content) 8.25 parts Toluene 58.86 parts

[0046] (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 copies Water 47.50 parts IPA 47.50 copies

[0047] (Adhesive layer) The adhesive layer coating liquid A, prepared by kneading the materials according to the following formulation, is heated and dried to a thickness of 4.0 μm after drying 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) SD4580PSA (manufactured by Dow Toray Industries, Inc.) 50.00 copies SRX-212 (manufactured by Dow Toray Industries, Inc.) 0.50 units Toluene 50.00 units

[0048] Reference example 1 The raw sheet of the repair adhesive tape is cut into strips 12 mm wide, and with a tension of 40 mN / mm width applied along the longitudinal direction of the raw sheet of repair adhesive tape, 20 m of tape is wound onto a plastic core with an outer diameter of 17 mm, with the adhesive layer facing inward. Reference example 1 I obtained adhesive tape for repair.

[0049] ( Reference example 2 ) Except for changing the thickness of the adhesive layer after heat drying to 15 μm, Reference example 1 In the same way as with the adhesive tape used for repairs, Reference example 2 I obtained adhesive tape for repair.

[0050] ( Reference example 3 ) Except for preparing an adhesive layer using coating liquid B prepared by kneading the materials in the following formulation, the adhesive layer was prepared so that its thickness after heat drying was 20 μm. Reference example 1 Using a similar method, Reference example 3 I obtained adhesive tape for repair. (Coating liquid for adhesive layer B) SD4585PSA (manufactured by Dow Toray Industries, Inc.) 50.00 copies SRX-212 (manufactured by Dow Toray Industries, Inc.) 0.50 units Toluene 50.00 units

[0051] ( Reference example 4 ) Except for the fact that an adhesive layer was prepared using adhesive coating liquid C, which was made by kneading the materials of the following formulation, so that the thickness after heat drying was 2.0 μm, Reference example 1 Using a similar method, Reference example 4 I obtained adhesive tape for repair. (Coating liquid for adhesive layer C) SD4584PSA (manufactured by Dow Toray Industries, Inc.) 50.00 copies SRX-212 (manufactured by Dow Toray Industries, Inc.) 0.50 units Toluene 50.00 units

[0052] (Example 5) Except for changing the post-drying thickness of the release layer to 0.5 μm, Reference example 1 The repair adhesive tape of Example 5 was obtained using the same method as the repair adhesive tape of Example 1.

[0053] (Example 6) Except for changing the post-drying thickness of the release layer to 1.5 μm, Reference example 1 The repair adhesive tape of Example 6 was obtained using the same method as the repair adhesive tape of Example 1.

[0054] ( Reference example 7 ) 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 7 I obtained adhesive tape for repair.

[0055] ( Reference example 8 ) 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 8 I obtained adhesive tape for repair.

[0056] ( Reference example 9 ) A PET film with a thickness of 19 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 9 I obtained adhesive tape for repair.

[0057] (Comparative Example 1) Except for using adhesive coating liquid C to prepare the adhesive layer so that its thickness after heat drying was 1.0 μm, Reference example 1 Using a similar method, the correction adhesive tape for Comparative Example 1 was obtained.

[0058] (Comparative Example 2) Except for preparing the adhesive layer using adhesive coating liquid B so that its thickness after heat drying was 25 μm, Reference example 1 Using a similar method, the correction adhesive tape for Comparative Example 2 was obtained.

[0059] (Comparative Example 3) 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 3 was obtained using the same method as for the correction adhesive tape described above.

[0060] (Comparative Example 4) 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 4 was obtained using the same method as for the correction adhesive tape described above.

[0061] (Comparative Example 5) Except for changing the post-drying thickness of the release layer to 0.5 μm and changing the adhesive layer coating liquid to adhesive layer coating liquid D prepared by kneading the materials in the following formulation, Reference example 1 Using a similar method, the correction adhesive tape for Comparative Example 5 was obtained. (Coating liquid for adhesive layer D) Licabond AP-620 (manufactured by Japan Coating Resin Co., Ltd.) 50.00 units Water 50.00 parts

[0062] (Comparative Example 6) Except for changing the post-drying thickness of the release layer to 0.5 μm and using adhesive coating liquid E prepared by kneading the materials according to the following formulation to create an adhesive layer with a thickness of 6.0 μm after heat drying, Reference example 1 Using a similar method, the correction adhesive tape of Comparative Example 6 was obtained. (Coating liquid for adhesive layer E) Olivine BPW6560 (manufactured by Toyo Chem Co., Ltd.) 50.00 copies Water 50.00 parts

[0063] (Comparative Example 7) Except for changing the post-drying thickness of the release layer to 0.5 μm and using the adhesive coating liquid F prepared by kneading the materials according to the following formulation to create an adhesive layer with a thickness of 2.0 μm after heat drying, Reference example 1 Using a similar method, Comparative Example 7 I obtained adhesive tape for repair. (Coating liquid F for adhesive layer) Nikazol TS-1979 (manufactured by Nippon Carbide Industries, Ltd.) 50.00 units Water 50.00 parts

[0064] (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.

[0065] (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 examined with a magnifying glass with a 10x magnification and a minimum measurement scale of 0.1 mm, its width is less than 0.2 mm. ×: The portion corresponding to the end of the correction adhesive tape is clearly a line. Cut.

[0066] (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.

[0067] (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.

[0068] (5) Re-peelability over time 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 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.

[0069] (6) 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.

[0070] (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.

[0071] (8) Adhesive layer adhesive strength Each embodiment, Reference example, A comparative example test specimen was prepared. The test specimen consisted of a PET film with a thickness of 12 μm on which only the adhesive layer was laminated, and then cut to a size of 25 mm in width and 300 mm in length. To measure the adhesive strength, the adhesive layer side of each test specimen was bonded to a designated stainless steel test plate as specified 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 Tables 1 and 2.

[0072] (Table 1) TIFF0007905168000001.tif125133

[0073] (Table 2) TIFF0007905168000002.tif125125 [Explanation of Symbols]

[0074] 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 opacity 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 to 15 μm, the white opacity layer contains a binder resin, a white pigment, a white extender pigment and / or silica, and the total content of the white pigment, the white extender pigment and the silica in the white opacity layer solid content is 60 to 80 A correction adhesive tape characterized in that the weight is %, 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 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 a silicone-based adhesive and the thickness of the adhesive layer is 2.0 μm or more and 20 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