WO2018190138A1

WO2018190138A1 - Article production method

Info

Publication number: WO2018190138A1
Application number: PCT/JP2018/013160
Authority: WO
Inventors: 誠二秋山; 森野　彰規
Original assignee: Dic株式会社
Priority date: 2017-04-12
Filing date: 2018-03-29
Publication date: 2018-10-18
Also published as: JPWO2018190138A1; JP6607425B2

Abstract

The problem to be solved by this invention is to provide an article production method with which, when affixing an adhesive sheet which does not contain toluene to a body to be covered at a predetermined position, it is possible to perform reaffixing work without causing deformation, cracking or the like in the body to be covered, and with which it is less likely to cause misalignment between the body to be covered and the adhesive sheet after reaffixing, thereby ensuring excellent provisional fixing properties, and which, after definitive adhesion, is not susceptible to peeling over time. This invention is a production method for an article configured in such a manner that an adhesive sheet is affixed to a body to be covered, and comprises a step [1] in which the body to be covered and the adhesive sheet are attached to one another by applying pressure at a load of 0.1N/cm2 to 7N/cm2, and a step [2] in which the body to be covered and the adhesive sheet are attached to one another by applying pressure at 10 N/cm2 to 200 N/cm2. The adhesive sheet used does not contain toluene in the adhesive.

Description

Manufacturing method of article

The present invention relates to a manufacturing method that can be used in the manufacturing scenes of various articles such as electronic devices.

Adhesive sheets are being considered for use in various electronic devices such as copiers and multifunction machines equipped with various displays, copy functions and scan functions.

As the adhesive sheet, for example, a double-sided adhesive sheet in which a pressure-sensitive adhesive layer is formed on both sides of a nonwoven fabric substrate, the interlayer fracture area ratio of the double-sided adhesive sheet is 10% or less, and the double-sided adhesive sheet is pulled. A double-sided adhesive sheet characterized in that the strength is 20 N / 10 mm or more in both the MD direction (longitudinal direction) and the TD direction (lateral direction) is known (see, for example, Patent Document 1).

On the other hand, with the recent enhancement of functionality and precision of the electronic device, in the manufacturing scene, it is required to attach two or more adherends to a precisely specified position without slight deviation. There is.

The pasting operation is usually performed manually. When performing the above-mentioned pasting by hand, it is difficult to fix the adherend at a precise position by a single pasting operation. Therefore, the adherend is usually only in a predetermined position by performing the pasting operation a plurality of times. It is possible to affix.

However, the conventional adhesive sheet is designed to exhibit very good adhesive strength to prevent parts from falling off from the final product, so when attaching the adhesive sheet to the adherend In addition, when a certain amount of load is applied, when the re-sticking operation is performed, an excellent adhesive strength is already exhibited, and the re-sticking operation may not be performed efficiently.

Further, if the load is reduced in order to improve the re-working efficiency, the adherend and the adhesive sheet are likely to be displaced or peeled off, and they may not be temporarily fixed at an appropriate position. there were.

On the other hand, in recent years, reduction of volatile organic chemical substances (VOCs) has been demanded from the viewpoint of social problems of chemical substance hypersensitivity (sick house syndrome) and environmental considerations. Among them, toluene is considered to be a causative substance of sick house syndrome, but it is still used in large quantities as a solvent for solvent-type adhesives. When toluene is used for the adhesive, toluene remains even after drying at the time of production of the adhesive sheet, and when this adhesive sheet is used, the residual toluene volatilizes in the living space and affects the onset of sick house syndrome. There is a possibility, and an adhesive sheet that does not use toluene in the sheet manufacturing process is desired.

JP 2001-152111 A

The problem to be solved by the present invention is that when an adhesive sheet containing no toluene is used and the adhesive sheet is applied to a predetermined position of the adherend, it is reapplied without causing deformation or cracking of the adherend. A method for producing an article that can be worked, has excellent temporary fixing because it hardly causes displacement between the adherend and the adhesive sheet after the re-attachment, and does not easily cause peeling over time after the main adhesion. Is to provide.

The present inventor has found that the above-mentioned problems can be solved by applying the adherend and the adhesive sheet with two different loads and using an adhesive sheet that does not contain toluene in the adhesive.

That is, the present invention provides a method of making an article having a structure that the adhesive sheet to the adherend is affixed, load the and the adherend and the adhesive sheet of ^{0.1N / cm 2 ~ 7N / cm} 2 A step [1] of crimping with an adhesive, and a step [2] of crimping the adherend and the adhesive sheet with a load of 10 N / cm ² to 200 N / cm ² , and the adhesive does not contain toluene. The present invention relates to a method for manufacturing an article using an adhesive sheet.

In the method for producing an article of the present invention, the adherend and the adhesive sheet are deformed even if the adherend is a thin member (aluminum plate, glass, etc.) that is likely to cause deformation or cracking. It can be re-applied multiple times without causing cracks, cracks, etc., so it should be used suitably for applications where two or more adherends are affixed to a strictly specified position without any slight deviation In addition, since the adhesive sheet does not contain toluene, it is environmentally friendly and can be suitably used for fixing a member in an enclosed space such as an automobile or a house without affecting sick house syndrome.

It is a conceptual diagram which shows the measuring method of surface adhesive strength. It is a conceptual diagram which shows the evaluation method of temporary fixability. It is a conceptual diagram which shows the evaluation method of re-pasting aptitude.

The method for producing an article of the present invention is a method for producing an article having a configuration in which an adhesive sheet is attached to an adherend, and the adherend and the adhesive sheet are bonded to each other at 0.1 N / cm ² to 7 N / cm. A step [1] of pressure bonding with a load in a range of ² and a step [2] of pressure bonding the adherend and the adhesive sheet with a load of 10 N / cm ² to 200 N / cm ^2. In this method, an adhesive sheet containing no toluene is used.

In the manufacturing method of the article, it is preferable to perform the steps [1] and [2] in order, before the step [1], between the steps [1] and [2], and after the step [2]. In addition to the steps [1] and [2], another step may be included as necessary.

The step [1] is a step of temporarily fixing the adhesive sheet to the adherend. More specifically, in the step [1], for example, when it is required to attach the adhesive sheet to a strictly specified position of the adherend, the adhesive layer between the adherend and the adhesive sheet contacting the door, a step of loading in the range of ^{0.1N / cm 2 ~ 7N / cm} 2. If the load is within the above range, the adhesive sheet can be applied without causing adhesive residue or deformation of the adherend even if it is difficult to fix the adherend in a precise position with a single application operation. The repairing operation can be performed a plurality of times, and a temporary fixing property at a level that does not cause displacement or peeling between the adherend and the adhesive sheet after the reattachment can be provided.

The load in the step [1] is preferably 0.2 N / cm ² to 6 N / cm ² , and more preferably 0.3 N / cm ² to 5 N / cm ² , It is more preferable to achieve both re-paste workability.

In addition, the load said by this invention points out the force concerning the interface of a to-be-adhered body and an adhesive sheet. More specifically, when the adherend and the adhesive sheet are pressure-bonded by a press machine, the force applied to the adherend and the adhesive sheet by the press machine is indicated. In addition, since the load resulting from the weight of an adhesive sheet is 0.01 N / cm < ² > or less normally and is very small, it was set as the value which is not considered when calculating the load said by this invention. On the other hand, when two adherends are bonded with an adhesive sheet and are bonded by a press or the like, a laminate is usually obtained by sufficiently bonding one adherend and the adhesive sheet in advance. Is mounted on the surface of the other adherend, and is crimped by, for example, a press machine. In this case, the load refers to the sum of the force applied to them by the press and the force derived from the mass of the adherend constituting the laminate. Even in this case, since the load due to the weight of the adhesive sheet is usually 0.01 N / cm ² or less and extremely small, the value is not considered when calculating the load in the present invention.

The step [1] can be performed in an arbitrary temperature environment, but it is not necessary to perform heating or the like as in a conventional thermoplastic adhesive sheet, and is preferably performed within a range of an assumed working environment temperature. Is preferably carried out in the range of −5 ° C. to 40 ° C., more preferably in the range of 0 ° C. to 35 ° C.

In the step [1], the time for pressure-bonding the adherend and the adhesive sheet with the load in the above range may be arbitrarily set in the work step, but the load should be applied for 1 second or longer in order to temporarily fix the article. Is preferred. On the other hand, in order to improve the production efficiency of the article, it is preferable that the loading time is not too long. Therefore, the pressing time is preferably 1 second to 30 seconds, and more preferably 3 seconds to 25 seconds. More preferably, it is 5 seconds to 20 seconds.

In the step [1], examples of the method for pressure-bonding the adherend and the adhesive sheet with the load in the above range include a method using a commercially available press, a finger pressure, a pressure roller, and a weight with a predetermined load. Here, when using a comparatively thin rigid body (thin glass etc.) as a to-be-adhered body, it is preferable to use the said press. On the other hand, when sticking an adhesive sheet on the curved surface portion of the adherend, it is preferable to employ a method of pressure bonding with a finger.

Next, the step [2] will be described.

The step [2] in the previous section is a step of firmly bonding (main fixing) the adherend and the adhesive sheet so as not to cause peeling over time. More specifically, in the step [2], for example, the adhesive sheet is temporarily fixed at a strictly specified position of the adherend, and then loaded in a range of 10 N / cm ² to 200 N / cm ^2. It is. If the load is within the above range, the adherend and the adhesive sheet can be firmly bonded, and as a result, peeling over time can be effectively prevented, and the adherend is subjected to the load. Can be effectively prevented from being deformed or damaged.

The load in the step [2] is preferably in the range of 10 N / cm ² to 150 N / cm ² , more preferably in the range of 11 N / cm ² to 125 N / cm ² , and 12 N / cm ² to 100 N. / Cm ² can firmly adhere the adherend and the adhesive sheet, and as a result, can effectively prevent peeling over time, and can be covered during loading. It is further preferable because deformation and damage of the wearing body can be effectively prevented.

The step [2] can be performed in an arbitrary temperature environment, but it is not necessary to perform heating or the like as in the case of a conventional thermoplastic adhesive sheet, and is preferably performed within a range of an assumed working environment temperature. Is preferably carried out in the range of −5 ° C. to 40 ° C., more preferably in the range of 0 ° C. to 35 ° C.

In the step [2], the time for pressure-bonding the adherend and the adhesive sheet with the load in the above range may be arbitrarily set in the work step, but the load is applied for 1 second or longer in order to temporarily fix the article. Is preferred. On the other hand, in order to improve the production efficiency of the article, it is preferable that the loading time is not too long. Therefore, the pressing time is preferably 1 second to 30 seconds, and more preferably 3 seconds to 25 seconds. More preferably, it is 5 seconds to 20 seconds.

In the step [2], as a method of pressure-bonding the adherend and the adhesive sheet with the load in the above range, a commercially available press machine, a finger pressure, a pressure roller, a weight of a predetermined load can be used to attach the adhesive sheet or the upper part of the adherend. The method of mounting to is mentioned. Here, when using a comparatively thin rigid body (thin glass etc.) as a to-be-adhered body, it is preferable to use the said press. On the other hand, when sticking an adhesive sheet on the curved surface portion of the adherend, it is preferable to employ a method of pressure bonding with a finger.

Next, the adhesive sheet used in the method for producing an article of the present invention will be described.

The adhesive sheet used in the method for producing an article of the present invention is characterized in that the adhesive layer does not contain toluene. If toluene is not contained in the adhesive layer, the adhesive is not particularly limited, and an adhesive resin dissolved in an organic solvent other than toluene may be used. Preferred organic solvents other than toluene include cyclohexane and methylcyclohexane, and at least one of these is preferably used as the solvent.
In addition, the adhesive resin may be coated by hot-melt coating without using an organic solvent, and an emulsion-type adhesive in which the adhesive resin is dispersed in water instead of an organic solvent is used. May be.

In the present invention, not containing toluene means that the amount of toluene diffused from the adhesive sheet is less than 100 μg / 100 cm ² . Toluene emission is measured using the headspace method of gas chromatography. That is, an adhesive sheet is sealed in a vial and heated at 100 ° C. for 30 minutes, and then a heated gas is injected and measured by gas chromatography (FID detector). If the amount of toluene emission is less than 100 μg / 100 cm ² , the adhesive sheet is processed by the customer, incorporated in parts and products, and the amount of toluene emission derived from the adhesive sheet when distributed to the market is reduced. Environmental impact can be reduced. The amount of toluene emission is more preferably less than 50 μg / 100 cm ² , and even more preferably less than 25 μg / 100 cm ² .

As an adhesive sheet used in the method for producing an article of the present invention, a so-called substrate-less adhesive sheet constituted by a single-layer adhesive layer, either directly or via another layer, on one or both sides of a support An adhesive sheet having a layer can be used. As the adhesive sheet, it is preferable to use an adhesive sheet having the adhesive layer on both sides of the support directly or via another layer.

The configuration of the adhesive sheet used in the method for producing an article of the present invention is not particularly limited as long as it exhibits temporary fixing, re-sticking property, and main fixing property by the pressure-bonding step, and does not contain toluene in the adhesive sheet.

The configuration of the adhesive sheet is not particularly limited as long as the adhesive sheet does not contain toluene and can be temporarily fixed, re-attached, and permanently fixed under the pressure conditions described above. For example, the surface of the adhesive layer is bonded to the surface of the adhesive layer and a part of the adhesive layer surface is provided with a non-adhesive or fine adhesive part, or a particle such as a bead is laminated on a part of the adhesive layer surface. If the surface of the adhesive layer is uneven, and a highly elastic adhesive is used for the adhesive layer, only the convex part is attached to the adherend during low pressure bonding. Examples include a structure that does not adhere. Among them, a sheet configuration in which irregularities are formed on the surface of the adhesive layer itself and a highly elastic adhesive is used for the adhesive layer is preferable because the number of manufacturing steps of the tape is small and it is possible to manufacture an adhesive sheet at a low cost. .

The adhesive layer in the adhesive sheet used in the method of making an article of the present invention, those storage modulus _{G 23} at frequency 1Hz and 23 ° C. is in the range of ^{1.0 × 10 4 Pa ~ 5.0 ×} 10 6 Pa It is preferable to use those having a range of 7.0 × 10 ⁴ Pa to 3.0 × 10 ⁶ Pa, and more preferably 1.0 × 10 ⁵ Pa to 3.0 × 10 ⁶ Pa. It is more preferable to use those in the range of 2.3 × 10 ⁵ Pa to 2.5 × 10 ⁶ Pa, and it is more preferable to use those in the range of 3.8 × 10 ⁵ Pa to 2. It is more preferable to use those having a range of 3 × 10 ⁶ Pa, and it is preferable to use those having a range of 7.0 × 10 ⁵ Pa to 2.3 × 10 ⁶ Pa. When attaching the adhesive sheet to the adherend While it is possible to perform re-reduction relatively easily, it is difficult to cause peeling or misalignment from the adherend (can be temporarily fixed). By performing the step [2], the surface of the adhesive layer, the adherend, This is particularly preferable because the adhesiveness can be further improved and a very excellent adhesive strength can be expressed.

Further, as the adhesive layer, the center line average surface roughness Ra of the surface in contact with the adherend is preferably 0.3 μm to 3.0 μm, more preferably 0.5 μm to 2.8 μm, The range of 0.7 μm to 2.5 μm is more preferable, the range of 1.0 μm to 2.3 μm is still more preferable, and the range of 1.5 μm to 2.2 μm is more preferable. ], The adhesive sheet and the adherend can be reattached relatively easily, while being difficult to cause peeling or misalignment from the adherend (can be temporarily fixed), the step [2]. Is particularly preferable because the adhesion between the surface of the adhesive layer and the adherend can be further improved and a very excellent adhesive strength can be expressed.

In addition, the center line surface average roughness Ra of the adhesive layer is “Color 3D Laser Microscope / VK-9500” manufactured by KEYENCE for any three locations on the surface of the adhesive layer (each in a range of 50 μm × 50 μm square) ( The average value of the centerline average surface roughness measured by performing surface measurement three times using a lens magnification of 50 times, measurement mode: ultra-depth, pitch: 0.05 μm, and optical zoom: 1.0 times) The center line average surface roughness Ra of the surface in contact with the layer adherend was determined.

As described above, the adhesive sheet having a center line average surface roughness Ra and the storage elastic modulus G ₂₃ in a given 23 ° C., in after obtaining a light load process of the step [1], the surface of the adherend And the convex portion of the concave-convex shape of the adhesive layer can be maintained, so that the above-described adhesive sheet can be efficiently re-attached, and the adhesion from the adherend can be increased by the adhesive force of the adhesive portion. Less likely to cause peeling or misalignment.

On the other hand, in the case of the above-mentioned adhesive sheet, since the uneven shape of the adhesive layer is deformed after the heavy load step of the step [2] and the entire surface is adhered to the adherend, very excellent adhesive force. Can be expressed.

As the adhesive layer, for example, an adhesive layer having so-called pressure-sensitive adhesiveness (adhesiveness) at room temperature (approximately 25 ° C. or less) can be used.

As the adhesive layer, an adhesive component of a resin having a so-called pressure-sensitive adhesive property (adhesiveness) or a tackifying resin that can be used as needed, even at room temperature (approximately 25 ° C. or less), and if necessary It is preferable to use those containing other additives that can be used.

Examples of the adhesive component constituting the adhesive layer include natural rubber polymers, synthetic rubber polymers, acrylic polymers, silicone polymers, urethane polymers, vinyl ether polymers, and the like.

Among these, as the adhesive component, it is preferable to use a synthetic rubber polymer or an acrylic polymer.

As the synthetic rubber-based polymer, it is preferable to use a styrene-based block copolymer. The styrenic block copolymer refers to a triblock copolymer, a diblock copolymer, or a mixture thereof having a polystyrene unit (a1) and a polyolefin unit (a2).

Examples of the styrenic block copolymer include polystyrene-poly (isopropylene) block copolymer, polystyrene-poly (isopropylene) block-polystyrene copolymer, polystyrene-poly (butadiene) block copolymer, polystyrene. -Poly (butadiene) block-polystyrene copolymer, polystyrene-poly (butadiene / butylene) block copolymer, polystyrene-poly (butadiene / butylene) block-polystyrene copolymer, polystyrene-poly (ethylene / propylene) block copolymer Polymer, polystyrene-poly (ethylene / propylene) block-polystyrene copolymer, polystyrene-poly (ethylene / butylene) block copolymer, polystyrene-poly (ethylene / butylene) block-poly Styrene copolymer, polystyrene - poly (ethylene - ethylene / propylene) block copolymer, polystyrene - poly (ethylene - ethylene / propylene) block - can be used polystyrene copolymer. Among these, as the styrenic block copolymer, a block copolymer having a polystyrene unit (a1) and a polyisoprene unit (a2) is preferably used, and a polystyrene-poly (isopropylene) block copolymer is preferably used. More preferably, a polymer, a polystyrene-poly (butadiene) block copolymer, or a polystyrene-poly (butadiene) block-polystyrene copolymer is used.

As the acrylic polymer, a polymer of an acrylic monomer can be used. As the acrylic monomer, (meth) acrylic acid, (meth) acrylic acid alkyl esters such as (meth) acrylic acid 2-ethylhexyl, (meth) acrylic acid n-butyl, and the like can be used.

As the tackifying resin, for the purpose of adjusting the strong adhesion of the adhesive layer, for example, rosin-based tackifying resin, polymerized rosin-based tackifying resin, polymerized rosin ester-based tackifying resin, rosin phenol-based tackifying resin Stabilized rosin ester tackifier resins, disproportionated rosin ester tackifier resins, terpene tackifier resins, terpene phenol tackifier resins, petroleum resin tackifier resins, and the like.

Among the above-described tackifying resins, it is preferable to use a terpene phenol-based tackifying resin. As the terpene phenol tackifying resin, it is possible to select and use a conventionally known terpene monomer / phenol copolymer having a softening point of 100 ° C. to 125 ° C. It is preferable for improving the compatibility with the resin and the like, and as a result, imparting excellent adhesiveness.

The terpene phenol-based tackifying resin is preferably used in an amount of 30 to 120 parts by weight with respect to a total of 100 parts by weight of the synthetic rubber polymer or acrylic polymer as the adhesive component, and 40 parts by weight. It is more preferable to use in the range of 100 parts by mass to 100 parts by mass in order to give even better adhesiveness.

As the adhesive component, in addition to the adhesive component, those containing a cross-linking agent, other additives and the like can be used as necessary.

As the crosslinking agent, for the purpose of improving the cohesive force of the adhesive layer, a known isocyanate crosslinking agent, epoxy crosslinking agent, aziridine crosslinking agent, polyvalent metal salt crosslinking agent, metal chelate crosslinking agent, A keto-hydrazide crosslinking agent, an oxazoline crosslinking agent, a carbodiimide crosslinking agent, a silane crosslinking agent, a glycidyl (alkoxy) epoxysilane crosslinking agent, or the like can be used.

As the adhesive layer, in addition to the above-described components, a foaming agent, a thermally expandable balloon, an antioxidant, a plasticizer, a filler, a pigment, an ultraviolet absorber, an ultraviolet stabilizer, a flame retardant, a difficult agent, if necessary. A flame retardant etc. can be used in the range which does not impair the effect of this invention.

Examples of the support include polyester resins such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate, polyamide resins such as polycarbonate, polyarylate, polyurethane, polyamide, and polyetheramide, polyimide, polyetherimide, and polyamideimide. Polyimide resins such as polysulfone, polysulfone resins such as polyethersulfone, polyetherketone resins such as polyetherketone and polyetheretherketone, organic resin films such as polyphenylene sulfide and modified polyphenylene oxide, cellulose fiber, polyester Weaves containing organic fibers such as fibers, aramid fibers, and liquid crystal polymer fibers, or inorganic fibers such as glass fibers, metal fibers, and carbon fibers Or nonwoven substrate, a glass plate, a film of an inorganic material such as a metal foil, sheet or plate, and the like laminates thereof.

Further, as the support, a composite such as glass fiber reinforced plastic (GFRP) can be used.

In addition, as the support, for example, as a base material, a woven or non-woven base material containing glass fiber, a glass base material including a glass fiber composite, a glass plate, a polyamide resin film, or a polyimide base material A resin film can be used.

It is preferable to use a support having a corona treatment on the surface or a support provided with a primer layer because the adhesion between the support and the adhesive layer can be improved.

Further, as the support, a support having a communication port can be used. As the support having a communication port, various types of conventionally known supports can be used. For example, paper, nonwoven fabric, porous film including the plastic film, metal mesh, punching film, etc. Can be used. The communication port means one or more openings that are spatially continuous and connect the first surface and the second surface of the support.

As the support, one having a thickness of 1 μm to 200 μm is preferably used, and one having a thickness of 12 μm to 50 μm is more preferable.

As the adhesive sheet, for example, it is preferable to use a sheet having a thickness of 25 μm or more, more preferably a sheet having a thickness of 50 μm to 120 μm, provided on one side of the support, It is more preferable to use one having a thickness of 60 μm to 120 μm in order to obtain an adhesive sheet that has excellent cohesive strength and exhibits excellent adhesive strength when pressed with a predetermined load.

As the adhesive sheet, for example, it is preferable to use a sheet having a total thickness of 50 μm or more, more preferably in the range of 50 μm to 300 μm, provided on both sides of the support. The range of 100 μm to 250 μm is more preferable, and the range of 100 μm to 210 μm is more preferable for obtaining an adhesive sheet that exhibits excellent cohesive strength and exhibits excellent adhesive strength when pressed with a predetermined load. preferable.
More preferable.

The adhesive sheet previously forms a bonding layer by applying a coating liquid (adhesive) containing the adhesive component on the surface of the release liner using a roll coater or the like, and drying. The adhesive layer can be produced by a transfer method in which the adhesive layer is bonded to one side or both sides of the support.

The form of the coating liquid (adhesive) is not particularly limited as long as it does not contain toluene in the coating liquid, and is a solvent system of an organic solvent dilution-type adhesive, an emulsion-type adhesive, and a water-soluble adhesive. And water-based adhesives such as hot melt adhesives, UV curable adhesives, and EB curable adhesives.

In the case of an organic solvent-type pressure-sensitive adhesive, examples of the diluent solvent include cyclohexane, methylcyclohexane, cyclohexanone, ethyl acetate, normal hexane, methyl ethyl ketone, methyl isobutyl ketone, acetone and the like as toluene substitute solvents.

In the case where a rubber copolymer is used as the adhesive component, it is preferable to use at least one of cyclohexane, methylcyclohexane, and cyclohexanone among the above because the solubility of the rubber copolymer is excellent. It is particularly preferred to use cyclohexane.

As a method for imparting a predetermined centerline average surface roughness Ra to the surface of the adhesive layer in contact with the adherend, the center average surface roughness of the release treatment surface of the release liner is preferably 0.00. 2 μm to 6.0 μm, more preferably 0.5 μm to 2.8 μm, more preferably 0.7 μm to 2.5 μm, more preferably 1.0 μm to 2.3 μm, still more preferably 1.5 μm to 2.2 μm. The method using the release liner which is the range is mentioned. Specifically, the coating liquid (adhesive) is applied to a release treatment surface of a release liner having a center average surface roughness in the above range, and dried to form an adhesive layer. A method of attaching to the surface of the support as necessary and removing the release liner may be mentioned.

By the above method, a centerline surface roughness that is the same as, approximately the same as, or slightly larger than the center average surface roughness of the release treatment surface is transferred to the surface of the adhesive layer.

Examples of the release liner include resin films such as polyethylene terephthalate, polyethylene, polypropylene, and ethylene-propylene copolymer, foam films, paper such as Japanese paper, western paper, and glassine paper, nonwoven fabrics, metal foils, and combinations thereof Among the laminated films, a film having a release treatment surface having a center line average surface roughness in the above range can be used.

The shape of the release treatment surface of the release liner can be imparted by sandblasting the surface of the film. Moreover, the shape etc. of the mold release process surface of the said release liner can use the film etc. which were obtained by shape | molding the mixture of the said resin and mat materials into a film form.

In addition, the method for producing an article of the present invention includes a method for producing an article having a configuration in which two or more adherends are bonded with an adhesive sheet. Specifically, an adhesive sheet is attached to one adherend. A step of attaching and pressure-bonding with a load of ² N / cm ² or more to manufacture a laminated body, a surface on the adhesive sheet side of the laminated body, and the other adherend are 0.1 N / cm ² to 7 N / cm ^2. And a step [3] of crimping with a load in the range of [3] and a step [4] of crimping the laminate and the other adherend with a load of 10 N / cm ² to 200 N / cm ^2. A method for manufacturing an article is included.

In the step of pressure-bonding one adherend and the adhesive sheet to produce a laminated body, it is preferable to pressure-bond them with a load of ² N / cm ² or more, and pressure bonding in the range of ² N / cm ² to 80 N / cm ^2. It is preferable.

The step [3] and the step [4] for pressure-bonding the laminate and the other adherend can be performed in the same manner as the above-described steps [1] and [2], respectively. In the step [4], the laminate may be placed and pressure-bonded on the surface (upper side) of the other adherend, and the laminate is placed with the surface on the adhesive sheet side facing up. The other adherend may be placed and pressure-bonded on the surface, but it is preferable to place the laminate on the surface (upper side) of the other adherend and press-fit.

The method for producing an article of the present invention can efficiently perform the re-sticking operation when the step [1] is performed, but has a very excellent adhesion when the step [2] is performed. Since the strength is developed, the adherend is thin and can be suitably used for reattaching and fixing the member that easily causes deformation or cracking.

As the surface adhesive strength obtained by the method of manufacturing an article of the present invention, for example, the adhesive sheet is cut into a square shape with a side (outside) length of 14 mm and a width of 2 mm, and the cut adhesive sheet is , 15 mm long, 15 mm wide, 5 mm thick, and attached to a transparent acrylic plate having a weight of 1.3 g, then 20 mm long, 50 mm wide and 1 mm thick with a 10 mm diameter hole in the center. After attaching the stainless steel plate (SUS304) and the surface of the test piece on the side of the adhesive sheet so that their centers coincide with each other, and performing the pressure bonding in the pressure bonding step [3] and the pressure bonding step [4], Using a tensile tester (A & D Tensilon RTA-100, compression mode) equipped with a stainless steel probe having a diameter of 8 mm, the probe made a hole in the stainless steel plate (SUS304). To, when a force is applied to the acrylic plate at 10 mm / min push rate is preferably strength when peeled from the stainless steel plate is 25 N / cm ² or more, that is 30 N / cm ² or more More preferably, it is more preferably 40 N / cm ² or more, and particularly preferably 50 N / cm ² or more in order to firmly adhere the adherend and prevent peeling over time.

Examples of the adherend include metals such as glass and aluminum, and plastics made of a resin such as acrylic and polycarbonate.

The article obtained by the manufacturing method of the present invention is suitably used in a sealed space such as a car or a bus, or a building such as a building or a house. For example, vehicle-mounted displays such as an in-vehicle display in which a decorative panel made of polycarbonate is bonded to an image display device, furniture in which a decorative sheet is bonded, furniture such as an underfloor material in which a flooring material is bonded, and building materials.

Hereinafter, specific examples will be described.

<Adhesive adjustment>
(Preparation Example 1) Adhesive (a-1)
Styrene-isoprene block copolymer Y having a weight average molecular weight of 300,000 (a mixture of a triblock copolymer and a diblock copolymer. The ratio of the diblock copolymer to the total amount of the mixture is 20% by mass. The mass proportion of polystyrene units in the total of styrene-isoprene block copolymer Y is 20 mass%, the mass proportion of polyisoprene units is 80 mass%), 100 mass parts, C5 petroleum-based tackifying resin (softening point 100 ° C, number An adhesive (a-1) was obtained by dissolving 40 parts by mass of average molecular weight 885) in 210 parts by mass of cyclohexane.

(Preparation Example 2) Adhesive (a-2)
Styrene-butadiene block copolymer X having a weight average molecular weight of 300,000 (mixture of triblock copolymer and diblock copolymer. The ratio of the diblock copolymer to the total amount of the mixture is 50% by mass. The mass proportion of polystyrene units in the whole styrene-butadiene block copolymer is 30 mass%, the mass proportion of polybutadiene units is 70 mass%), 100 mass parts, terpene phenol-based tackifier resin (softening point 115 ° C, number average molecular weight) 1000) A mixture of 100 parts by mass was dissolved in 300 parts by mass of cyclohexane to obtain an adhesive (a-2).

(Preparation Example 3) Adhesive (a-3)
Styrene-butadiene block copolymer X having a weight average molecular weight of 300,000 (mixture of triblock copolymer and diblock copolymer. The ratio of the diblock copolymer to the total amount of the mixture is 50% by mass. The mass proportion of polystyrene units in the whole styrene-butadiene block copolymer is 30 mass%, the mass proportion of polybutadiene units is 70 mass%), 100 mass parts, terpene phenol-based tackifier resin (softening point 115 ° C, number average molecular weight) 1000) A mixture of 80 parts by mass was dissolved in 270 parts by mass of cyclohexane to obtain an adhesive (a-3).

(Preparation Example 4) Adhesive (a-4)
Styrene-butadiene block copolymer X having a weight average molecular weight of 300,000 (mixture of triblock copolymer and diblock copolymer. The ratio of the diblock copolymer to the total amount of the mixture is 50% by mass. The mass proportion of polystyrene units in the whole styrene-butadiene block copolymer is 30 mass%, the mass proportion of polybutadiene units is 70 mass%), 100 mass parts, terpene phenol-based tackifier resin (softening point 115 ° C, number average molecular weight) 1000) A mixture of 65 parts by mass was dissolved in 248 parts by mass of cyclohexane to obtain an adhesive (a-4).

(Preparation Example 5) Adhesive (a-5)
Styrene-butadiene block copolymer X having a weight average molecular weight of 300,000 (mixture of triblock copolymer and diblock copolymer. The ratio of the diblock copolymer to the total amount of the mixture is 50% by mass. The mass proportion of polystyrene units in the whole styrene-butadiene block copolymer is 30 mass%, the mass proportion of polybutadiene units is 70 mass%), 100 mass parts, terpene phenol-based tackifier resin (softening point 115 ° C, number average molecular weight) 1000) A mixture of 40 parts by mass was dissolved in 210 parts by mass of cyclohexane to obtain an adhesive (a-5).

(Preparation Example 6) Adhesive (a-6)
Styrene-butadiene block copolymer X having a weight average molecular weight of 300,000 (mixture of triblock copolymer and diblock copolymer. The ratio of the diblock copolymer to the total amount of the mixture is 50% by mass. The mass proportion of polystyrene units in the whole styrene-butadiene block copolymer is 30 mass%, the mass proportion of polybutadiene units is 70 mass%), 100 mass parts, terpene phenol-based tackifier resin (softening point 115 ° C, number average molecular weight) 1000) A mixture of 65 parts by mass was dissolved in 248 parts by mass of methylcyclohexane to obtain an adhesive (a-6).

(Preparation Example 7) Adhesive (a-7)
Styrene-butadiene block copolymer X having a weight average molecular weight of 300,000 (mixture of triblock copolymer and diblock copolymer. The ratio of the diblock copolymer to the total amount of the mixture is 50% by mass. The mass proportion of polystyrene units in the whole styrene-butadiene block copolymer is 30 mass%, the mass proportion of polybutadiene units is 70 mass%), 100 mass parts, terpene phenol-based tackifier resin (softening point 115 ° C, number average molecular weight) 1000) A mixture of 80 parts by mass was dissolved in 270 parts by mass of toluene to obtain an adhesive (a-7).

(Preparation Example 8) Adhesive (a-8)
Styrene-butadiene block copolymer X having a weight average molecular weight of 300,000 (mixture of triblock copolymer and diblock copolymer. The ratio of the diblock copolymer to the total amount of the mixture is 50% by mass. The mass proportion of polystyrene units in the whole styrene-butadiene block copolymer is 30 mass%, the mass proportion of polybutadiene units is 70 mass%), 100 mass parts, terpene phenol-based tackifier resin (softening point 115 ° C, number average molecular weight) 1000) A mixture of 65 parts by mass was dissolved in 248 parts by mass of toluene to obtain an adhesive (a-8).

(Preparation Example 9) Adhesive (a-9)
Styrene-butadiene block copolymer X having a weight average molecular weight of 300,000 (mixture of triblock copolymer and diblock copolymer. The ratio of the diblock copolymer to the total amount of the mixture is 50% by mass. The mass proportion of polystyrene units in the whole styrene-butadiene block copolymer is 30 mass%, the mass proportion of polybutadiene units is 70 mass%), 100 mass parts, terpene phenol-based tackifier resin (softening point 115 ° C, number average molecular weight) 1000) A mixture of 40 parts by mass was dissolved in 210 parts by mass of toluene to obtain an adhesive (a-9).

<Preparation of adhesive sheet>
(Production Example 1)
The adhesive (a-1) was applied to the surface of a release liner having a center line average surface roughness Ra of 1.63 μm using an applicator so that the thickness after drying was 88 μm, and at 85 ° C. An adhesive layer was formed by drying for 5 minutes. After the adhesive layer was bonded to both sides of a 25 μm thick polyethylene terephthalate film, the adhesive sheet 1 was obtained by pressing and laminating at 40 N / cm ² .

(Production Example 2)
The adhesive (a-2) was applied to the surface of a release liner having a center line average surface roughness Ra of 1.63 μm using an applicator so that the thickness after drying would be 88 μm, and at 85 ° C. An adhesive layer was formed by drying for 5 minutes. The adhesive layer was bonded to a polyethylene terephthalate film surfaces of thickness 25 [mu] m, by pressurizing the laminate at 40N / cm ^2, to obtain an adhesive sheet 2.

(Production Example 3)
The adhesive (a-3) was applied to the surface of a release liner having a center line average surface roughness Ra of 1.63 μm so that the thickness after drying was 88 μm using an applicator, and at 85 ° C. An adhesive layer was formed by drying for 5 minutes. The adhesive layer was bonded to both sides of a 25 μm-thick polyethylene terephthalate film, and then pressed and laminated at 40 N / cm ² to obtain an adhesive sheet 3.

(Production Example 4)
The adhesive (a-4) was applied to the surface of a release liner having a center line average surface roughness Ra of 1.63 μm so that the thickness after drying was 88 μm using an applicator, An adhesive layer was formed by drying for 5 minutes. The adhesive layer was bonded to both sides of a 25 μm thick polyethylene terephthalate film, and then pressed and laminated at 40 N / cm ² to obtain an adhesive sheet 4.

(Production Example 5)
The adhesive (a-5) was applied to the surface of a release liner having a center line average surface roughness Ra of 1.63 μm using an applicator so that the thickness after drying was 88 μm, at 85 ° C. An adhesive layer was formed by drying for 5 minutes. The adhesive layer was bonded to both sides of a 25 μm-thick polyethylene terephthalate film, and then pressed and laminated at 40 N / cm ² to obtain an adhesive sheet 5.

(Production Example 6)
The adhesive (a-6) was applied to the surface of a release liner having a center line average surface roughness Ra of 1.63 μm using an applicator so that the thickness after drying was 88 μm, at 85 ° C. An adhesive layer was formed by drying for 5 minutes. After bonding the adhesive layer on both sides of a polyethylene terephthalate film having a thickness of 25 μm, the adhesive sheet 6 was obtained by pressurizing and laminating at 40 N / cm ² .

(Production Example 7)
The adhesive (a-7) was applied to the surface of a release liner having a center line average surface roughness Ra of 1.63 μm using an applicator so that the thickness after drying was 88 μm, An adhesive layer was formed by drying for 5 minutes. The adhesive layer was bonded to both sides of a 25 μm thick polyethylene terephthalate film, and then pressed and laminated at 40 N / cm ² to obtain an adhesive sheet 7.

(Production Example 8)
The adhesive (a-8) was applied to the surface of a release liner having a center line average surface roughness Ra of 1.63 μm using an applicator so that the thickness after drying was 88 μm, and at 85 ° C. An adhesive layer was formed by drying for 5 minutes. The adhesive layer was bonded to both sides of a 25 μm thick polyethylene terephthalate film, and then pressed and laminated at 40 N / cm ² to obtain an adhesive sheet 8.

(Production Example 9)
The adhesive (a-9) was applied to the surface of a release liner having a center line average surface roughness Ra of 1.63 μm so that the thickness after drying was 88 μm using an applicator, An adhesive layer was formed by drying for 5 minutes. The adhesive layer 9 was obtained by laminating the adhesive layer on both sides of a polyethylene terephthalate film having a thickness of 25 μm by pressing at 40 N / cm ² and laminating.

Example 1
Under an environment of 23 ° C., the adhesive sheet 1 was cut into a frame shape having a square with a side (outer shape) length of 14 mm and a width of 2 mm.
The release liner on one side of the cut adhesive sheet is peeled off, and the transparent acrylic plate, which is a rectangular parallelepiped having a length of 15 mm, a width of 15 mm, a thickness of 5 mm, and a weight of 1.3 g, and the adhesive sheet are applied with a press machine at 50 N / After applying and applying a cm ² load for 10 seconds, the pressurized state was released. At that time, after making one side of the cut adhesive sheet correspond to one side 15 mm of the transparent acrylic plate, the other release liner was peeled off.

Next, in an environment of 23 ° C., a stainless plate (SUS304) having a length of 30 mm, a width of 65 mm and a thickness of 5 mm having a hole having a diameter of 10 mm in the center portion and a weight of 90 g, The surfaces on the adhesive sheet side are overlapped so that their centers coincide with each other, and they are loaded with a press machine for 10 seconds with a force such that the load applied to the adhesive sheet is 1.0 N / cm ² (crimping step). [3]).
After releasing the loaded state, they were loaded with a press machine for 10 seconds with a force of 15 N / cm ² applied to the adhesive sheet (crimping step [4]). Thereafter, an article was obtained by solving the loaded state.

(Example 2)
An article was obtained in the same manner as in Example 1 except that the adhesive sheet 2 was used in place of the adhesive sheet 1.

(Example 3)
An article was obtained in the same manner as in Example 1 except that the adhesive sheet 3 was used in place of the adhesive sheet 1.

Example 4
An article was obtained in the same manner as in Example 1 except that the adhesive sheet 4 was used in place of the adhesive sheet 1 and the load in the crimping step [4] was 25 N / cm ² .

(Example 5)
An article was obtained in the same manner as in Example 1 except that the adhesive sheet 5 was used in place of the adhesive sheet 1 and the load in the crimping step [4] was 150 N / cm ² .

(Example 6)
An article was obtained in the same manner as in Example 1 except that the adhesive sheet 6 was used in place of the adhesive sheet 1 and the load in the crimping step [4] was 25 N / cm ² .

(Comparative Example 1)
Articles were produced in the same manner as in Example 2 except that the load in the crimping step [4] was 2.0 N / cm ² .

(Comparative Example 2)
Articles were produced in the same manner as in Example 4 except that the load in the crimping step [4] was 2.0 N / cm ² .

(Comparative Example 3)
Articles were produced in the same manner as in Example 4 except that the load in the crimping step [3] was 25 N / cm ² .

(Comparative Example 4)
An article was obtained in the same manner as in Example 1 except that the adhesive sheet 7 was used in place of the adhesive sheet 1 and the load in the crimping step [4] was 25 N / cm ² .

(Comparative Example 5)
An article was obtained in the same manner as in Example 1 except that the adhesive sheet 8 was used in place of the adhesive sheet 1 and the load in the crimping step [4] was 25 N / cm ² .

(Comparative Example 6)
An article was obtained in the same manner as in Example 1 except that the adhesive sheet 9 was used in place of the adhesive sheet 1 and the load in the crimping step [4] was 50 N / cm ² .

[Measurement of toluene emission in adhesive sheet]
The amount of toluene emitted from the adhesive sheet was measured using a head space method of gas chromatography. The adhesive sheet was sealed in a vial and heated at 100 ° C. for 30 minutes, and then heated gas was injected and measured by gas chromatography (FID detector).

(Measurement of dynamic viscoelasticity of adhesive layer)
By applying the adhesive used in the production of the adhesive sheet obtained in the production example to the surface of the release liner using an applicator so that the thickness after drying becomes 100 μm, and drying at 85 ° C. for 5 minutes. A plurality of adhesive layers each having a thickness of 100 μm were formed.

Each of the test pieces made of an adhesive layer having a thickness of 2 mm was prepared by superimposing the adhesive layers obtained above.

A parallel plate having a diameter of 7.9 mm was attached to a viscoelasticity tester (ARES 2kSTD) manufactured by TA Instruments Japan. The test piece is sandwiched between the parallel plates with a compression load of 40 to 60 g, and a storage elastic modulus G at 23 ° C. under the conditions of a frequency of 1 Hz, a temperature range of −60 to 150 ° C., and a heating rate of 2 ° C./min. ₂₃ was measured.

[Temporary fixability after crimping step [3]]
The article after the crimping step [3] described in the examples and comparative examples is placed on a flat surface so that the stainless steel plate faces down, the acrylic board is pinched with the thumb and middle finger, and the article is vertically oriented. Lifted and held in air for 10 seconds. It was visually confirmed whether or not the acrylic plate had dropped from the stainless steel plate during the 10 seconds (see FIG. 2).

The temporary fixability test was conducted 10 times and evaluated according to the following criteria.
A: The stainless steel plate did not fall during all 10 tests.
B: The stainless steel plate dropped 1-2 times during 10 tests.
C: The stainless steel plate dropped 3 to 5 times during 10 tests.
D: The stainless plate dropped 6 to 10 times during 10 tests.

[Adequacy of re-attachment after crimping step [3]]
The article after the crimping step [3] described in the examples and comparative examples is placed on a flat table so that the stainless steel plate faces down, the acrylic plate is pinched with the thumb and middle finger, and the stainless steel plate is held with the other hand. It was confirmed whether or not the acrylic plate could be peeled off from the stainless steel plate when the acrylic plate was pulled in the vertical direction at a speed of about 30 m / min while being pressed.

The re-paste aptitude test was conducted 10 times and evaluated according to the following criteria.
A: The acrylic board was able to be peeled off in all 10 tests.
B: The acrylic plate could be peeled 8 to 9 times during 10 tests.
C: The acrylic plate could be peeled off 3 to 7 times during 10 tests.
D: The acrylic board was peeled off twice or less during 10 tests.

[Surface bond strength after crimping step [2]]
The article after the crimping step [4] described in Examples and Comparative Examples was set in a tensile testing machine (A & D Tensilon RTA-100, compression mode) equipped with a stainless steel probe having a diameter of 8 mm. When the probe applies a force to the acrylic plate constituting the article through the hole of the stainless steel plate (SUS304) constituting the article, the strength when the acrylic board is peeled off from the stainless steel plate (N / Cm ² ) at 23 ° C. The speed at which the probe pushes the acrylic plate was set to 10 mm / min.

As described above, in Examples 1 to 6, the temporary fixing property and the reattachability are excellent, the adhesiveness after the main adhesion is excellent, and the toluene emission amount from the adhesive sheet is less than 100 μg / cm ^2. Thus, it can be seen that two or more adherends can be accurately attached to a specific position while reducing the load on the environment and the human body. On the other hand, in Comparative Examples 1 and 2 in which the load in the crimping step [4] ([2]) is smaller than a predetermined value, the surface adhesion strength after the main bonding is inferior, and the load in the crimping step [3] ([1]) is predetermined. In Comparative Example 3, which is larger than the value, the result of inferior suitability for reattachment was obtained. Further, in Comparative Examples 4 to 6 in which toluene was contained in the adhesive layer of the adhesive sheet, the amount of toluene emitted from the adhesive sheet was large, and there was concern about the burden on the environment and the human body.

1 transparent acrylic plate 2 cut adhesive sheet 3 stainless steel plate (SUS304)
4 Probe 5 Plane stand

Claims

A method of making an article having a structure that the adhesive sheet to the adherend is affixed, wherein the step of crimping the the adherend and the adhesive sheet under a load of 0.1N / cm 2 ~ 7N / cm 2 [ 1], and a step [2] of pressure-bonding the adherend and the adhesive sheet with a load of 10 N / cm 2 to 200 N / cm 2 , and an article that does not contain toluene in the adhesive layer of the adhesive sheet Production method.
The manufacturing method of the article according to claim 1, wherein the step [2] is performed after the step [1].
The method for manufacturing an article according to claim 1 or 2, wherein the step [1] is performed twice or more.
The pressure bonding method of step [1] is a method of pressure bonding for 1 second to 30 seconds in a temperature environment of −5 ° C. to 40 ° C., and the pressure bonding method of step [2] is a temperature of −5 ° C. to 40 ° C. The method for producing an article according to any one of claims 1 to 3, wherein the article is pressure-bonded in an environment for 1 to 30 seconds.
The method for producing an article according to any one of claims 1 to 4, wherein a center line average surface roughness Ra of a surface of the adhesive layer in contact with the adherend is in a range of 0.2 µm to 5.0 µm.
A method for manufacturing an article having a configuration in which two or more adherends are bonded by an adhesive sheet, the step of manufacturing a laminate by applying an adhesive sheet to one adherend and pressing the laminate, a step of crimping the surface of the adhesive sheet side and the other adherend at a load of 0.1N / cm 2 ~ 7N / cm 2 [3], and said laminate and the other adherend 10 N / cm A method for producing an article comprising the step [4] of pressure bonding with a load of 2 to 200 N / cm 2 and containing no toluene in the adhesive layer of the adhesive sheet.
The method for manufacturing an article according to claim 6, wherein the step [4] is performed after the step [3].
The method for manufacturing an article according to claim 6 or 7, wherein the step [3] is performed twice or more.
The method for producing an article according to any one of claims 1 to 8, wherein a storage elastic modulus of the adhesive layer of the adhesive sheet at 23 ° C is 1 × 10 4 Pa to 5 × 10 6 Pa.
The article method according to any one of claims 1 to 9, wherein an amount of toluene diffused from the adhesive sheet is less than 100 μg / 100 cm 2 .