CN106661389B - Adhesive sheet - Google Patents
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- CN106661389B CN106661389B CN201580044870.1A CN201580044870A CN106661389B CN 106661389 B CN106661389 B CN 106661389B CN 201580044870 A CN201580044870 A CN 201580044870A CN 106661389 B CN106661389 B CN 106661389B
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- adhesive sheet
- adhesive
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- sheet
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/10—Adhesives in the form of films or foils without carriers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J109/00—Adhesives based on homopolymers or copolymers of conjugated diene hydrocarbons
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J153/00—Adhesives based on block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
- C09J153/02—Vinyl aromatic monomers and conjugated dienes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J201/00—Adhesives based on unspecified macromolecular compounds
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Adhesive Tapes (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
Abstract
The invention provides an adhesive sheet with adhesive removing performance, which is characterized in that: elongation at break of 500% or more and stress at break of 1.0N/mm2And the adhesive force to the acrylic adhesive surface is 15N/25mm or more.
Description
Technical Field
The present invention relates to an adhesive sheet. More specifically, the present invention relates to an adhesive sheet for removing an adhesive layer adhered to glass or the like.
The present application claims priority based on Japanese patent application No. 2014-171671 filed on 26/8/2014 and Japanese patent application No. 2014-224907 filed on 5/11/2014, the contents of which are incorporated herein by reference.
Background
In recent years, electronic devices such as mobile phones, portable game machines, and digital cameras have rapidly spread. An adhesive sheet is generally used for fixing components constituting electronic devices and various apparatuses. As an adhesive sheet used for fixing a component, an adhesive sheet having an adhesive layer provided on one surface or both surfaces of a substrate is commonly used (patent document 1).
In addition, Flat Panel Displays (FPDs) such as liquid crystal displays (L CDs) are widely used as display devices, and in such display devices, various optical members such as an antireflection film for preventing reflection from an external light source and a protective film (protection film) for preventing damage to the surface of the display device are generally used depending on the application, and an adhesive sheet is also used for bonding the optical members of these display devices (patent document 2).
In many cases, acrylic polymers are used in the adhesive layer of the adhesive sheet disclosed in patent documents 1 and 2, and the adhesive layer is provided on one side or both sides of a support (substrate).
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open No. 2012-140605
Patent document 2: japanese patent laid-open No. 2003-238915
Disclosure of Invention
Technical problem to be solved by the invention
In the adhesive sheet used for such applications, when members are bonded to each other to exhibit excellent adhesiveness and re-bonding is necessary, there is an increasing demand for reworking (re-peeling). In particular, when a defect such as dirt biting occurs when the liquid crystal display device is attached to another member (for example, a touch panel module) or when the cover glass is attached to the scattering prevention film, there is a high demand for reworking in order to reuse the liquid crystal display device or the cover glass, which is relatively expensive.
However, the adhesive sheets described in patent documents 1 and 2 have a problem that reworkability is insufficient and the adhesive remains on the adherend during reworking. The adhesive remaining on the adherend needs to be wiped with a solvent or washed with a solvent, and there is a problem that the rework operation takes much labor and time.
In order to solve the problems of the prior art, the inventors of the present invention have made studies with an object to provide an adhesive sheet which can be attached to a surface of an adhesive to be removed and can easily remove the adhesive attached to an adherend by peeling. Further, the present inventors have studied for the purpose of providing an adhesive sheet having sufficient adhesive force and exhibiting excellent reworkability.
Means for solving the problems
As a result of extensive studies to solve the above problems, the inventors of the present invention have found that an adhesive sheet having excellent adhesive removal performance can be obtained by setting the elongation at break, the stress at break, and the adhesive force to the acrylic adhesive surface of the adhesive sheet to a certain value or more. Further, the present inventors have found that such an adhesive sheet has sufficient adhesive force to an adherend and exhibits excellent reworkability, and have completed the present invention.
Specifically, the present invention has the following configuration.
[1]An adhesive sheet characterized by: elongation at break of 500% or more and stress at break of 1.0N/mm2And the adhesive force to the acrylic adhesive surface is 15N/25mm or more.
[2] The pressure-sensitive adhesive sheet according to [1], wherein the rubber-based resin is used as a main component.
[3] The pressure-sensitive adhesive sheet according to [2], wherein the rubber-based resin is a styrene-based copolymer.
[4] The pressure-sensitive adhesive sheet according to [2] or [3], wherein the rubber-based resin is a styrene-based block copolymer, and the styrene-based block copolymer contains a block obtained by polymerizing styrene and a block obtained by polymerizing at least one selected from the group consisting of ethylene, propylene and butylene.
[5] The pressure-sensitive adhesive sheet according to [4], wherein the content of the block obtained by polymerizing styrene is 10 to 50% by mass based on the styrene block copolymer.
[6] The adhesive sheet according to any one of [2] to [5], wherein the rubber-based resin is an A-B-A type triblock copolymer, A is a block obtained by polymerizing styrene, and B is a block obtained by polymerizing at least one selected from ethylene, propylene and butylene.
[7] The adhesive sheet according to any one of [1] to [6], wherein the adhesive sheet comprises a rubber-based resin, a tackifier, and a plasticizer, the tackifier is contained in an amount of 10 to 90 parts by mass per 100 parts by mass of the rubber-based resin, and the plasticizer is contained in an amount of 10 to 80 parts by mass per 100 parts by mass of the rubber-based resin.
[8] The adhesive sheet according to any one of [1] to [7], wherein the adhesive sheet is a double-sided adhesive sheet.
[9] The adhesive sheet according to any one of [1] to [8], which has a thickness of 80 μm or more.
[10] The adhesive sheet according to any one of [1] to [9], which is used for bonding to an optical member.
[11] The adhesive sheet according to [10], wherein the optical member is a liquid crystal cell or a touch panel.
[12] The adhesive sheet according to any one of [1] to [11], which is a single layer without a support.
[13] An adhesive sheet with a release sheet, wherein the release sheet is laminated on at least one surface of the adhesive sheet according to any one of [1] to [12 ].
[14] An adhesive sheet with a release sheet, wherein the release sheet is laminated on both surfaces of the adhesive sheet according to any one of [1] to [12 ].
Effects of the invention
According to the present invention, an adhesive sheet having excellent adhesive removing performance can be obtained. Further, the pressure-sensitive adhesive sheet of the present invention has sufficient adhesive force to an adherend and can exhibit excellent reworkability.
Drawings
FIG. 1 is a sectional view showing an adhesive sheet of the present invention.
FIG. 2 is a sectional view showing the pressure-sensitive adhesive sheet with a release sheet of the present invention.
Detailed Description
The present invention will be described in detail below. The following description of the constituent elements is based on a representative embodiment or a specific example, but the present invention is not limited to this embodiment. In the present specification, the numerical range expressed by the term "to" means a range in which the numerical values before and after the term "to" are included as the lower limit value and the upper limit value.
(adhesive sheet)
The invention relates to a steel wire rope with elongation at break of more than 500% and stress at break of 1.0N/mm2And an adhesive sheet having an adhesive force to an acrylic adhesive surface of 15N/25mm or more. The adhesive sheet of the present invention has the following features: when the elongation at break and the stress at break are set to the above values or more, the adhesive sheet is easily elongated in response to the peeling force applied to the adhesive sheet during the rework operation, and the adhesive sheet is hard to break. In addition, the pressure-sensitive adhesive sheet of the present invention can exhibit excellent adhesiveness to a pressure-sensitive adhesive remaining on an adherend by setting the adhesive force to the acrylic pressure-sensitive adhesive surface to the value described above or more. Therefore, by attaching the pressure-sensitive adhesive sheet of the present invention to an adherend having a pressure-sensitive adhesive remaining thereon to be removed and peeling the sheet, the pressure-sensitive adhesive remaining on the adherend can be easily removed. That is, the pressure-sensitive adhesive sheet of the present invention exhibits excellent pressure-sensitive adhesive properties to an adherend and a residual pressure-sensitive adhesive and also exhibits excellent pressure-sensitive adhesive removal performance.
The pressure-sensitive adhesive sheet of the present invention has sufficient adhesive force to an adherend, and therefore can be used for bonding various members. In this case, the adhesive sheet of the present invention can exhibit excellent reworkability. Here, the reworkability means a property that a part of the adhesive sheet does not remain on the adherend when peeled off after the attachment and the adhesive sheet does not break during the reworking operation.
The elongation at break and the stress at break were measured in accordance with JIS K6251 using a tensile tester. The measurement can be made by the initial distance between the jaws: 50mm, drawing speed: the sample (adhesive sheet) was kneaded under tension at 1000 mm/min into a rod-like shape having a diameter of 5mm and a length of 70mm, and the measurement was carried out. Further, the tensile test was carried out at 23 ℃ under an atmosphere of 50% relative humidity. The elongation at break indicates the elongation immediately before break between defined points of a test piece (adhesive sheet) in a tensile test. The breaking stress is a value obtained by dividing a tensile force at a breaking point at the time of breaking in a tensile test by an initial cross-sectional area of the test piece. The tensile test is a test in which the elongation at break and the stress at break in the longitudinal direction of the adhesive sheet are measured.
The adhesive sheet may have an elongation at break of 500% or more, preferably 600% or more, more preferably 800% or more, and still more preferably 1000% or more. The breaking stress of the adhesive sheet is only 1.0N/mm2Above, preferably 1.5N/mm2Above, more preferably 2.0N/mm2Above, more preferably 3.0N/mm2The above.
The pressure-sensitive adhesive sheet may have an adhesive force to the acrylic pressure-sensitive adhesive surface of 15N/25mm or more, preferably 20N/25mm or more, and more preferably 25N/25mm or more. In the measurement of the adhesive force to the acrylic pressure-sensitive adhesive surface, as the adherend for measuring the adhesive force of the pressure-sensitive adhesive sheet of the present invention, a pressure-sensitive adhesive surface from which a release film of an acrylic pressure-sensitive adhesive sheet (manufactured by shinkoku chemical company (NEW TAC KASEI), CPETT75HNA/DP/T7) was peeled off was used as the adherend. The measurement of the adhesive force can be carried out in accordance with JIS Z0237.
When the elongation at break of the adhesive sheet is represented by A and the breaking stress is represented by B, the elongation at break is preferably 100 < A/B < 1000, and more preferably 200 < A/B < 800. By setting the relationship between the elongation at break and the stress at break within the above range, the adhesive sheet can be easily elongated in response to the peeling force applied to the adhesive sheet, and the breakage of the adhesive sheet can be suppressed.
The pressure-sensitive adhesive sheet of the present invention preferably contains a rubber-based resin as a main component. Examples of the rubber-based resin include natural rubber-based resins and synthetic rubber-based resins. The rubber-based resin as the main component is a rubber-based resin that is contained in an amount of 30 mass% or more, preferably 35 mass% or more, and more preferably 45 mass% or more, based on the total mass of the pressure-sensitive adhesive sheet.
The rubber-based resin is preferably a synthetic rubber-based resin, and examples of the synthetic rubber-based resin include a styrene-isoprene-styrene block copolymer (SIS), a styrene-butadiene-styrene block copolymer (SBS), a hydrogenated product of a styrene-based block copolymer, a styrene-butadiene rubber (SBR), a polyisoprene rubber (IR), Polyisobutylene (PIB), a butyl rubber (IIR), and the like. These synthetic rubbers may be used alone, or in combination of 2 or more.
Among them, the rubber-based resin is preferably a styrene-based copolymer, and more preferably a styrene-based block copolymer. The styrene-based block copolymer preferably contains a block obtained by polymerizing styrene and a block obtained by polymerizing at least one selected from the group consisting of ethylene, propylene and butylene. The block obtained by polymerizing at least one selected from the group consisting of ethylene, propylene and butene may be a block obtained by polymerizing a hydride of these substances.
The block to be polymerized with styrene may contain other components such as ethylene as long as it is a block containing styrene as a main component. The block to be polymerized with styrene preferably contains 90% by mass or more of a component derived from styrene, and more preferably contains 95% by mass or more. Further, the block obtained by polymerizing at least one selected from the group consisting of ethylene, propylene and butene may similarly contain other constituent components.
The block obtained by polymerizing at least one selected from the group consisting of ethylene, propylene and butene is preferably a block containing a polymer containing ethylene and butene. Such a block may be a block copolymer comprising a block of ethylene and a block of butene, or may be a random copolymer of ethylene and butene.
The styrene-polymerizable block content in the styrene-based block copolymer is preferably 10 to 50% by mass, more preferably 10 to 40% by mass, and still more preferably 10 to 35% by mass, based on the styrene-based block copolymer. The content of the styrene-polymerizable block is different from the content of styrene contained in the entire adhesive sheet, because the content of the styrene-polymerizable block contained in the styrene-based block copolymer is different from the content of styrene contained in the entire adhesive sheet. In the present invention, when the content of the styrene-polymerizable block contained in the styrene-based block copolymer is within the above range, the adhesive force to the acrylic pressure-sensitive adhesive surface can be within a desired range, and therefore, the acrylic pressure-sensitive adhesive sheet can be preferably used as an acrylic pressure-sensitive adhesive removing sheet. Further, by setting the content of the block obtained by polymerizing styrene to the above range, tackiness (instantaneous adhesive force) of the pressure-sensitive adhesive sheet other than the acrylic pressure-sensitive adhesive surface can be suppressed, and handling properties as an acrylic pressure-sensitive adhesive removing pressure-sensitive adhesive sheet can be improved.
Further, the rubber-based resin is preferably an A-B-A type triblock copolymer. Wherein A of the A-B-A type triblock copolymer is a block obtained by polymerizing styrene, and B is a block obtained by polymerizing at least one selected from ethylene, propylene and butene. Further, B may be a block of a random copolymer of 2 or more selected from ethylene, propylene and butene, and even when B is a random copolymer, the copolymer is classified as an a-B-a type triblock copolymer. Further, B may be a block copolymer of 2 or more selected from ethylene, propylene and butene, and even when 2 blocks are contained as such, the copolymer is classified as an a-B-a type triblock copolymer.
Examples of the a-B-a type triblock copolymer include a styrene-based block copolymer (styrene-hydrogenated isoprene-styrene triblock copolymer) represented by the following formula (1), a styrene-based block copolymer (styrene- (ethylene/butylene) -styrene triblock copolymer) represented by the following formula (2), and a styrene-based block copolymer (styrene- (hydrogenated ethylene/isoprene) -styrene triblock copolymer) represented by the following formula (3).
In the formula (1), m represents the degree of polymerization, and PS represents a block in which styrene is polymerized. m can be calculated from the molecular weight of the styrenic block copolymer.
In the formula (2), m and n each represent a polymerization degree, and PS represents a block in which styrene is polymerized. m and n can be calculated from the molecular weight of the styrenic block copolymer.
In the formula (3), m represents the degree of polymerization, and PS represents a block in which styrene is polymerized. m can be calculated from the molecular weight of the styrenic block copolymer.
It is also preferable that in the A-B-A type triblock copolymer, A is a block obtained by polymerizing styrene and B is a block obtained by polymerizing hydrogenated isoprene.
The weight average molecular weight (Mw) of the rubber resin is preferably 10000 to 1000000, more preferably 50000 to 800000, and further preferably 80000 to 500000. The weight average molecular weight (Mw) was measured by Gel Permeation Chromatography (GPC) and calculated based on a calibration curve prepared using polystyrene standard substances.
(additives)
The pressure-sensitive adhesive sheet of the present invention contains a rubber-based resin as a main component. Further, the adhesive sheet of the present invention preferably contains a tackifier and a plasticizer. Examples of the thickener include petroleum resins such as styrene resins, terpene resins, rosin resins, C5 resins, C9 resins, and C5/C9 resins. Among them, styrene-based resins (styrene-based tackifiers) can be preferably used.
The content of the tackifier is preferably 10 to 90 parts by mass, more preferably 10 to 80 parts by mass, and still more preferably 20 to 80 parts by mass, per 100 parts by mass of the rubber-based resin. When the content of the tackifier is within the above range, the adhesive remaining on the adherend can be effectively removed. Further, by setting the content of the tackifier within the above range, an adhesive sheet can be obtained which improves the adhesiveness of the adhesive sheet and exhibits excellent reworkability.
As the tackifier resin, a tackifier resin having a softening point of 100 ℃ or lower and a tackifier resin having a softening point of 120 ℃ or higher may be used together in order to exhibit adhesive force at low temperature and cohesive force at high temperature. The adhesive sheet containing such a tackifier resin can be favorably used in a wide range of temperature environments.
As the plasticizer, oil components, phthalate esters, and the like can be used, and oil components are particularly preferable in terms of environmental aspects and safety. The oil component exerts an effect of controlling the elongation at break and the stress at break of the adhesive sheet. The oil component is preferably a paraffinic or naphthenic system oil, and a paraffinic system oil is more preferably used for the reason that deterioration of rubber is less likely to occur. The content of the plasticizer varies depending on the molecular weight of the rubber resin used, and is preferably 10 to 90 parts by mass, more preferably 10 to 80 parts by mass, still more preferably 10 to 70 parts by mass, and most preferably 20 to 70 parts by mass, relative to 100 parts by mass of the rubber resin.
Further, additives such as a softening agent, a crosslinking agent, and a pigment may be added to the adhesive sheet as needed.
The anti-aging agent may be, for example, a general phenol type antioxidant, a phosphorus type antioxidant, an ultraviolet resistant agent, a hindered amine type stabilizer (HA L S), etc. the amount of the anti-aging agent added is preferably 0.05 to 5 parts by mass, more preferably 0.1 to 3 parts by mass, per 100 parts by mass of the rubber resin.
(constitution of pressure-sensitive adhesive sheet)
The adhesive sheet of the present invention may be a laminated adhesive sheet in which an adhesive sheet is laminated on at least one surface of a support (substrate), and is preferably a single-layer double-sided adhesive sheet 10 as shown in fig. 1. That is, the pressure-sensitive adhesive sheet of the present invention is preferably a single layer without a support (substrate). The pressure-sensitive adhesive sheet of the present invention has less tackiness (instantaneous adhesive force) to the surface other than the acrylic pressure-sensitive adhesive surface, and therefore has less sticky feeling. Therefore, the pressure-sensitive adhesive sheet of the present invention has excellent handling properties even without a support (substrate). The pressure-sensitive adhesive sheet is a single-layer pressure-sensitive adhesive sheet having no support (substrate), and has a tensile strength at break of 500% or more and a tensile strength at break of 1.0N/mm in the entire thickness region2The adhesive sheet is composed of the adhesive layer having an adhesive force to the acrylic adhesive surface of 15N/25mm or more.
When the pressure-sensitive adhesive sheet has a support (base material), the support (base material) preferably also has an elongation at break of 500% or more. That is, the support (substrate) preferably has the same elongation as that of the adhesive layer constituting the adhesive sheet. When the elongation at break of the adhesive sheet is P and the elongation at break of the support (base material) is Q, the ratio P/Q is preferably 0.3 to 3.0.
Specifically, as the support (substrate), a substrate having good adhesion to a rubber adhesive and a large elongation at break is preferably used. Specific examples thereof include urethane sheets and flexible polyvinyl chloride sheets.
The thickness of the adhesive sheet is preferably 80 μm or more, more preferably 100 μm or more. The adhesive sheet of the present invention has a thickness of at least a certain value, and thus can easily remove the adhesive remaining on the adherend. Further, the reworkability of the adhesive sheet can be further improved.
(adhesive sheet with Release sheet)
The release sheet is preferably laminated on at least one side of the adhesive sheet, and the adhesive sheet of the present invention is preferably an adhesive sheet with a release sheet. The release sheet is preferably laminated on at least one side of the adhesive sheet, and more preferably laminated on both sides as shown in fig. 2. The release sheet may be one in which a release agent layer is provided on a polymer film. As shown in fig. 2, when the release sheets are laminated on both sides of the adhesive sheet 10, it is preferable that 2 release sheets (the first release sheet 20 and the second release sheet 30) have different release forces, and specifically, it is preferable to use different release agents. By laminating the release sheets having different release forces as described above, the adhesion separation phenomenon in which the adhesive sheet floats from the release sheet on the heavy release force side can be suppressed when the release sheet on the light release force side is peeled. The peeling force of the peeling sheet on the heavy peeling force side is preferably 0.08 to 0.80N/50mm, and the peeling force of the peeling sheet on the light peeling force side is preferably 0.01 to 0.20N/50 mm. Further, the peeling force R on the heavy peeling force sideHPeeling force R from the sheet on the light peeling force sideLRatio (R)H/RL) Preferably 1.5 or more.
In the form in which release sheets are laminated on both sides of an adhesive sheet, when a difference in the release force between the two release sheets can be maintained, the adhesive coating liquid may be applied to the second release sheet, and then the first release sheet may be bonded and pressure bonded. The adhesive sheet may be in the form of a sheet or a roll.
The adhesive sheet of the present invention is also characterized by excellent shape retention. In general, a single-layer double-sided adhesive sheet is difficult to maintain its shape in a state where a release sheet is peeled. For example, in adhesive sheetsAnd the case where one part is adhered to another part, or wrinkled. In this case, the projected area of the adhesive sheet after peeling off the double-sided release sheet is smaller than the area of the adhesive sheet before peeling off the release sheet, and the adhesive surface is smaller, so that the adhesive removal area is reduced, and the workability is remarkably deteriorated. However, since the adhesive sheet of the present invention has excellent shape retention properties, it is suitable as an adhesive sheet for removing an adhesive even in a single layer, and has excellent handling properties. Specifically, in the adhesive sheet of the present invention, the area (cm) of the adhesive sheet before the peeling of the release sheet2) S, the projected area (cm) of the adhesive sheet from which the double-sided release sheet was peeled off2) When T is used, T/S is preferably > 0.9, and T/S > 0.95 is more preferred. The projected area T of the adhesive sheet after peeling off the double-sided release sheet is the projected area of the adhesive surface of the single-layer adhesive sheet after peeling off the release sheet with only 1 corner of the adhesive sheet.
(method for producing adhesive sheet)
The adhesive sheet of the present invention is formed into a sheet by coating an adhesive for adhesive sheets. The pressure-sensitive adhesive for pressure-sensitive adhesive sheets is preferably obtained by uniformly mixing a rubber-based resin, a tackifier and an oil component. Examples of the method for producing the pressure-sensitive adhesive for pressure-sensitive adhesive sheets include a method in which a commercially available granular rubber-based resin is dissolved in a solvent such as toluene, and a thickener, an oil component, and the like are mixed; or a method in which a granular rubber is heated and softened, and a thickener or an oil component is kneaded by a kneader.
The adhesive for adhesive sheets produced in the above manner can be applied by an existing method to form sheets. When an adhesive prepared by dissolving in a solvent is used, the adhesive is applied by a blade coater or the like, and then the solvent is dried in a drying furnace to form a sheet. On the other hand, when an adhesive produced by a kneading method using heating is used, a hot melt coater that softens the adhesive by heating in advance is used, whereby the adhesive can be formed into a sheet.
The adhesive sheet is preferably formed on the first release sheet, and the second release sheet is preferably laminated on the first release sheet after the adhesive sheet is formed by the above-described method. In this manner, a release sheet-attached adhesive sheet can be produced in which release sheets are laminated on both sides of the adhesive sheet.
(adhesive sheet for removing adhesive)
The adhesive sheet of the present invention is useful as an adhesive sheet for removing an adhesive. Specifically, the adhesive sheet of the present invention is attached to the surface of the adhesive remaining on the adherend, and then the adhesive sheet is peeled off, whereby the remaining adhesive adhering to the adherend can be removed. The adhesive sheet of the present invention can exhibit excellent adhesive removing performance particularly against residual acrylic adhesives, and can be preferably used as an adhesive sheet for acrylic adhesive removal.
(pressure-sensitive adhesive sheet for optical Member)
The adhesive sheet of the present invention can be preferably used for bonding various members. The application of the bonding is not limited, and it is preferably used for bonding to an optical member. Examples of the optical member include a liquid crystal cell and a touch panel.
(image display apparatus)
The present invention may also relate to an image display apparatus including the adhesive sheet for an optical member. The image display apparatus can be manufactured by attaching the adhesive sheet of the present invention to an optical member and incorporating the optical member with the adhesive sheet into an image display apparatus.
Examples
The features of the present invention will be described in more detail below with reference to examples and comparative examples. The materials, the amounts used, the ratios, the contents of the treatments, the procedures of the treatments and the like shown in the following examples can be appropriately changed without departing from the gist of the present invention. Therefore, the scope of the present invention should not be construed as being limited to the specific examples shown below.
(example 1)
[ production of adhesive for adhesive sheet ]
100 parts by mass of a styrene-based block copolymer (styrene-hydrogenated isoprene-styrene triblock copolymer) (Septon 2063, manufactured by Coli corporation), 70 parts by mass of a styrene-based tackifier (FTR 8100, manufactured by Mitsui chemical corporation), and 50 parts by mass of a paraffin Oil (Diana Process Oil PW-90, manufactured by shin-Kogyo corporation) were dissolved in toluene and stirred until uniform, to obtain a toluene solution of an adhesive having a solid content of 45 mass%. The weight average molecular weight (Mw) of the styrene-based block copolymer was 120000 in terms of polystyrene standard substance as measured by Gel Permeation Chromatography (GPC). The solid content means a rubber component, a thickener, and an oil component.
[ preparation of adhesive sheet ]
The pressure-sensitive adhesive sheet for pressure-sensitive adhesive sheet prepared as described above was applied to a release sheet on the heavy release force side (R L-07 (2)) by a blade coater so that the thickness of the sheet was 100 μm after drying, and then dried at 100 ℃ for 3 minutes to dry the toluene solvent, thereby obtaining a double-sided pressure-sensitive adhesive sheet.
(example 2)
In the production process of the adhesive for adhesive sheets, adhesive sheets with release sheets were obtained in the same manner as in example 1, except that the amount of styrene-based tackifier added was changed to 30 parts by mass and the amount of paraffin-based oil produced by glazer company was changed to 25 parts by mass.
(example 3)
An adhesive sheet with a release sheet was obtained in the same manner as in example 1 except that a triblock copolymer of styrene- (ethylene/butylene) -styrene (manufactured by clony, Septon 8007L) was used as the styrene-based block copolymer, and the weight average molecular weight (Mw) of the styrene-based block copolymer was converted to 100000 by Gel Permeation Chromatography (GPC) measurement using a polystyrene standard substance.
(example 4)
An adhesive sheet with a release sheet was obtained in the same manner as in example 1, except that a styrene- (hydrogenated ethylene/isoprene) -styrene triblock copolymer (manufactured by clony, HYBRAR 7311) was used as the styrene block copolymer. The polystyrene block copolymer was converted to a weight average molecular weight (Mw) of 160000 as measured by Gel Permeation Chromatography (GPC) using a polystyrene standard.
Comparative example 1
An adhesive sheet with a release sheet was obtained in the same manner as in example 1, except that NA084 (manufactured by New Tac Kasei co., L td, OCA/acrylic) was used as the double-sided adhesive sheet.
Comparative example 2
An adhesive sheet with a release sheet was obtained in the same manner as in example 1, except that SA114 (manufactured by New Tac Kasei co., L td, OCA/acrylic) was used as the double-sided adhesive sheet.
Comparative example 3
In the production process of the adhesive for adhesive sheets, adhesive sheets with release sheets were obtained in the same manner as in example 1, except that the amount of styrene-based tackifier added was changed to 100 parts by mass and the amount of paraffin-based oil added was changed to 100 parts by mass.
(evaluation)
(method of measuring elongation at break and stress at break)
The adhesive sheet kneaded into a rod shape having a diameter of 5mm and a length of 70mm was attached to a tensile tester, and the adhesive sheet was stretched at a stretching speed of 1000 mm/min at an inter-chuck distance of 50mm, whereby the elongation at break and the stress at break were measured.
(adhesive force to acrylic pressure-sensitive adhesive surface)
The double-sided adhesive sheet of each of the examples and comparative examples was peeled off from the light-peeling-force side, and the peel sheet was laminated with a 100 μm polyethylene terephthalate (PET) film (COSMOSHINEA 4300, manufactured by toyoyo textile corporation) to prepare an adhesive film sheet, and then the remaining heavy-peeling-force side peel sheet was peeled off to measure the adhesive force of the adhesive film sheet, and at this time, as an adherend for measuring the adhesive force, the adhesive force was measured in accordance with JIS Z0237, except that the peeled adhesive surface of a release film of CPETT75HNA/DP/T7 (manufactured by New Tac Kasei co., L td) was used as the adherend.
(evaluation of adhesive removing Property)
The release film on the light peeling force side of the double-sided adhesive tape without a base material (hereinafter referred to as OCA/New Tac Kasei co., L td, SA032 manufactured by SA032) was peeled off and attached to glass, autoclave treatment (0.5MPa, 40 ℃, 30 minutes) was performed, the release film on the heavy peeling force side was peeled off, the double-sided adhesive sheets of examples and comparative examples were attached to the exposed adhesive surface, and then the laminate of the double-sided adhesive tape and the double-sided adhesive sheet was peeled from the glass.
○ the laminate was easily and thoroughly peeled from the glass, and no adhesive from the double-sided adhesive tape (OCA) or adhesive sheet remained on the glass.
△, the laminate was peeled from the glass, but the adhesive sheet was broken at the middle of the peeling, making the peeling difficult.
× the double-sided adhesive sheet immediately broke or peeling occurred on the surface of the double-sided adhesive sheet and the double-sided adhesive tape (OCA), and the laminate or the double-sided adhesive tape (OCA) was not peeled from the glass.
(evaluation of reworkability)
The double-sided adhesive sheets of examples and comparative examples were cut so as to have a size of 5cm × 5cm, the release film on the light peeling force side was peeled off and bonded to soda glass, and then the release film on the heavy peeling force side was removed by treatment at 40 ℃ under 0.5MPa in an autoclave for 30 minutes.
○ the double-sided adhesive sheet was easily and thoroughly peeled from the glass, leaving no adhesive residue.
△, although the double-sided adhesive sheet peeled from the glass, the adhesive sheet broke in the middle and was difficult to peel.
× the double-sided adhesive sheet immediately broke and was not peeled from the glass.
[ Table 1]
It is understood that example 1 has higher adhesive force to the acrylic pressure-sensitive adhesive surface and excellent pressure-sensitive adhesive removing performance than comparative examples. In addition, the adhesive sheets of the examples were also excellent in reworkability.
Description of the reference numerals
10 is an adhesive sheet; 20 is a first release sheet; and 30 is a second release sheet.
Claims (10)
1. Use of an adhesive sheet for removing an acrylic adhesive, characterized in that:
the adhesive sheet comprises a rubber resin, a tackifier and a plasticizer,
the content of the tackifier is 20-80 parts by mass relative to 100 parts by mass of the rubber resin,
the content of the plasticizer is 10 to 80 parts by mass relative to 100 parts by mass of the rubber resin,
the rubber resin is a styrene-based block copolymer containing a block obtained by polymerizing styrene and a block obtained by polymerizing at least one selected from the group consisting of ethylene, propylene and butylene,
the tackifier is styrene resin, and the tackifier is styrene resin,
the plasticizer is one or more oil components selected from the group consisting of paraffin-based oils and naphthene-based oils,
elongation at break of 500% or more and stress at break of 1.0N/mm2And the adhesive force to the acrylic adhesive surface is 15N/25mm or more.
2. The use according to claim 1, wherein the styrene-polymerizable block content is 10 to 50% by mass relative to the styrene-based block copolymer.
3. Use according to claim 1 or 2, wherein the rubber-based resin is a triblock copolymer of the a-B-a type, and
a is a block obtained by polymerizing styrene, and B is a block obtained by polymerizing at least one selected from the group consisting of ethylene, propylene and butene.
4. Use according to claim 1 or 2, wherein the adhesive sheet is a double-sided adhesive sheet.
5. The use according to claim 1 or 2, wherein the adhesive sheet has a thickness of 80 μm or more.
6. Use according to claim 1 or 2, the adhesive sheet being for application to an optical member.
7. The use according to claim 6, wherein the optical member is a liquid crystal cell or a touch panel.
8. The use according to claim 1 or 2, the adhesive sheet having no support and being a single layer.
9. The use according to claim 1 or 2, wherein a release sheet is laminated on at least one side of the adhesive sheet.
10. The use according to claim 1 or 2, wherein a release sheet is laminated on both sides of the adhesive sheet.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014171671 | 2014-08-26 | ||
| JP2014-171671 | 2014-08-26 | ||
| JP2014224907A JP6417863B2 (en) | 2014-08-26 | 2014-11-05 | Adhesive sheet |
| JP2014-224907 | 2014-11-05 | ||
| PCT/IB2015/001432 WO2016030737A1 (en) | 2014-08-26 | 2015-08-25 | Adhesive sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106661389A CN106661389A (en) | 2017-05-10 |
| CN106661389B true CN106661389B (en) | 2020-08-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201580044870.1A Active CN106661389B (en) | 2014-08-26 | 2015-08-25 | Adhesive sheet |
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| Country | Link |
|---|---|
| JP (1) | JP6417863B2 (en) |
| KR (1) | KR101894741B1 (en) |
| CN (1) | CN106661389B (en) |
| TW (1) | TWI568828B (en) |
| WO (1) | WO2016030737A1 (en) |
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| KR101785380B1 (en) * | 2016-04-12 | 2017-10-16 | 주식회사 테이팩스 | Adhesive Film |
| TWI804497B (en) * | 2017-06-26 | 2023-06-11 | 日商迪愛生股份有限公司 | Adhesive tape and method for peeling adhesive tape from adherend |
| JP7020907B2 (en) * | 2017-12-28 | 2022-02-16 | 積水化学工業株式会社 | Double-sided adhesive tape |
| WO2019167922A1 (en) * | 2018-03-01 | 2019-09-06 | Dic株式会社 | Pressure-sensitive adhesive tape |
| JP7001000B2 (en) * | 2018-06-15 | 2022-01-19 | 王子ホールディングス株式会社 | Adhesive layer and laminate |
| JP7227608B2 (en) * | 2019-04-16 | 2023-02-22 | 北川工業株式会社 | Adhered body holding member |
| WO2022024668A1 (en) * | 2020-07-29 | 2022-02-03 | 日東電工株式会社 | Method for removing attachment adhesive, structure, and pressure-sensitive adhesive sheet |
| KR102645165B1 (en) * | 2022-04-06 | 2024-04-02 | 주식회사모아글로벌 | Adhesive Film For Removing Acrylic Adhesives |
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| JP2007169421A (en) * | 2005-12-21 | 2007-07-05 | Three M Innovative Properties Co | Removable pressure-sensitive adhesive tape and article-mounting kit |
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-
2014
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2015
- 2015-08-25 KR KR1020177004619A patent/KR101894741B1/en active IP Right Grant
- 2015-08-25 WO PCT/IB2015/001432 patent/WO2016030737A1/en active Application Filing
- 2015-08-25 CN CN201580044870.1A patent/CN106661389B/en active Active
- 2015-08-26 TW TW104127892A patent/TWI568828B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| TW201610085A (en) | 2016-03-16 |
| KR20170033387A (en) | 2017-03-24 |
| JP2016047904A (en) | 2016-04-07 |
| WO2016030737A1 (en) | 2016-03-03 |
| TWI568828B (en) | 2017-02-01 |
| JP6417863B2 (en) | 2018-11-07 |
| CN106661389A (en) | 2017-05-10 |
| KR101894741B1 (en) | 2018-09-04 |
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