TWI812660B - Manufacturing method of article using adhesive tape - Google Patents

Abstract

The problem to be solved by the present invention is to provide a manufacturing method of an article that prevents wrinkles or gaps from occurring when attaching an adhesive tape to components of various shapes such as flat surfaces, curved surfaces, and 3D shapes to ensure high waterproofness. The present invention relates to a method of manufacturing an article, which is a method of manufacturing an article that is adhered through an expansion material of an adhesive tape. The method of manufacturing an article is characterized by including: step [1], making an adhesive with expandability The ends of two or more adhesive tapes of layer (A) are arranged close to each other, and one surface side of the adhesive tape is attached to the portion (c1-1) constituting the adherend (C1); step [2 ], attach the other side of the adhesive tape to another adherend (C2); step [3], provide stimulation to the expandable adhesive layer (A); and step [4], because The swelling adhesive layer (A) expands due to the stimulation to form the swelling adhesive layer (A1).

Description

Method of manufacturing articles using adhesive tape

The present invention relates to an article manufacturing method that can be used in the production of various articles represented by, for example, electronic equipment.

In general, adhesive tapes are preferably used when fixing one adherend to a flat or curved surface of another adherent, for example, in the manufacture of various products such as automotive components or electrical equipment. widely used in situations. For example, regarding electronic equipment, in mobile electronic equipment such as smartphones, mobile phones, personal handyphone systems (PHS), digital cameras, music players, e-books, notebook personal computers, etc., the information display unit is The bonding between the display panel and the frame is represented by the use of adhesive tapes in the fixation of various components or modules. When joining the display panel and the frame, the adhesive tape is cut into a window frame shape along the peripheral edge of the display panel, and the window frame-shaped adhesive tape is attached to the peripheral edge of the display panel or the frame. After that, the display panel and the frame are brought together and fixed. As the adhesive tape used at this time, in order to ensure followability to the joint surface of the frame, waterproofness between the display panel and the frame, and to absorb impact when dropped, etc., a foam base material was used. A double-sided adhesive tape with adhesive layers on both sides (Patent Document 1).

On the other hand, in recent years, in automobile parts, electronic equipment, etc., curved surfaces or three-dimensional (three-dimensional, 3D) shapes are increasing, and the adhesive tape cut into a window frame shape is difficult to adhere to curved surfaces or 3D-shaped components, or wrinkles or gaps may occur during attachment, so it becomes difficult to ensure that the Described performance.

[Prior art documents]

[Patent Document]

[Patent Document 1] Japanese Patent Application Laid-Open No. 2009-108314

The problem to be solved by the present invention is to provide a manufacturing method of an article that prevents wrinkles or gaps and ensures high waterproofness when attaching an adhesive tape to components of various shapes such as flat surfaces, curved surfaces, and 3D shapes.

The present invention relates to a method of manufacturing an article having a structure in which an adhesive tape is attached to a body to be adhered. The method of manufacturing the article is characterized by: step [1], making the article have expandability. The ends of two or more adhesive tapes of the adhesive layer (A) are arranged close to each other, and one surface side of the adhesive tape is attached to the portion constituting the adherend (C1) (c1-1); step [2], attach the other side of the adhesive tape to another adherend (C2); step [3], stimulate the expandable adhesive layer (A); and step [4] , due to the stimulation, the expandable adhesive layer (A) expands to form an expandable adhesive layer (A1).

According to the manufacturing method of the article of the present invention, the adhesive tape can be attached to It prevents wrinkles and gaps from forming on components of various shapes such as flat surfaces, curved surfaces, and 3D shapes to ensure high waterproofness.

1: Then bring A

2: Then bring B

3: The connected body

4: Polycarbonate board 1

5: Polycarbonate board 2

6: Then bring 1

7: Then bring 2

8: Polycarbonate board 3

9: Step difference part

Figure 1 is a diagram of two bonding tapes (A and B) having an expandable adhesive layer (A) arranged on the body to be bonded in step [1] of the present invention so that their ends are in contact with each other. Sectional view.

2 is a cross-sectional view of the two bonding tapes (A and B) having the expandable adhesive layer (A) so that their ends overlap with each other on the adherend in step [1] of the present invention.

FIG. 3 is a view of FIG. 1 and FIG. 2 viewed from above.

4 is a cross-sectional view of an article before expansion related to the manufacturing method of the present invention in Example 1.

5 is a cross-sectional view of an article before expansion related to the manufacturing method of the present invention in Example 4.

The manufacturing method of an article of the present invention is a manufacturing method of an article having a structure in which an adhesive tape is attached to a body to be adhered. The manufacturing method of the article is characterized by: step [1], applying an expandable adhesive layer (A ), the ends of two or more bonding tapes are arranged close to each other, and one surface side of the bonding tape is attached to the portion (c1-1) constituting the adherend (C1); step [2], The other side of the bonding tape is attached to another adherend (C2); step [3], adjust the expandability The adhesive layer (A) is stimulated; and step [4] causes the expandable adhesive layer (A) to expand due to the stimulation to form an expanded adhesive layer (A1).

The step [1] is a step of attaching the tape carefully to the person being attached. Specifically, the step [1] is to arrange the ends of two or more adhesive tapes having the expandable adhesive layer (A) to overlap or be close to each other, and attach one of the surface sides of the adhesive tapes. The step is performed on the part (c1-1) constituting the body to be adhered (C1).

In the step [1], the ends of two or more adhesive tapes having the expandable adhesive layer (A) are arranged close to each other, and one of the surface sides of the adhesive tapes is attached to the body constituting the adherend. In the step of (c1-1) of (C1), when two or more bonding tapes are arranged so that their ends are close to each other, it is preferable that there is no gap, but it is also preferable that there is a gap between the ends. It is 100 μm or less, preferably 75 μm or less. If it is 50 μm or less, in the step [4], when the expandable adhesive layer (A) expands to form the expandable adhesive layer (A1), it can be buried The above-mentioned fixation is performed by leaving a gap between the ends of the tape, so it is more preferable.

The surface of the adhesive tape to be attached to the object to be adhered in step [1] is not particularly specified. For example, if the tape has the expandable adhesive layer (A) on one side and the other side, In the case of an adhesive tape having an adhesive layer (B) described later, when the adhesive layer (A) is attached to the adherend in the step [1], the other side of the adhesive tape It is better because the other side is more firmly bonded to other bonded objects (C2).

Preferably, in the step [1], one of the surface sides of the bonding tape is press-bonded to the portion (c1-1) constituting the adherend (C1) with a load of 0.1 N/cm ² or more, and more preferably When pressure bonding is performed with a load of 0.5 N/cm ² or more, and if pressure bonding is performed with a load of 1 N/cm ² or more, the bonding force of the bonding tape to the portion (c1-1) constituting the adherend (C1) is improved. , it is preferable because it can suppress the deviation between the bonding tape and the adhered body (C1).

When crimping one of the surface sides of the adhesive tape to the portion (c1-1) constituting the adherend (C1), you can use equipment such as a punch or a roller if necessary, or you can press them with your fingers. .

The step [2] is to attach the other surface side of the adhesive tape attached to the portion (c1-1) constituting the adherend (C1) in the step [1] to another adherent. Follow the steps of body (C2). When the other side of the adhesive tape is attached to another adherent body (C2), the connection between the adherend body (C2) and the adhesive tape can be made through the adherend body (C2). A load is applied to the interface, and pressure bonding can be performed optionally.

The step [3] is a step of stimulating the expandable adhesive layer (A). Examples of the stimulus include heat or light. As the stimulus, in terms of being applicable to light-impermeable members, heating is preferred. In addition, the heating temperature is preferably 60°C to 145°C. If it is 70°C to 140°C, the stability during storage is excellent and the adherend with low heat resistance can be used without damaging it. The adhesive tape is preferably fully expanded and can obtain excellent adhesive force after expansion.

Examples of the heating method include a method in which the article is put into a heating device such as an oven or a heating furnace and the entire article is heated, or a method in which a heat source is brought into contact with the article. Or a method of heating the expandable adhesive layer (A) close to the expandable adhesive layer (A), the adhesive tape, or the adherend.

As the heat source, for example, a halogen lamp, a laser irradiation device, an electromagnetic induction heating device, a hot stamp, a hot plate, a soldering iron, etc. can be used. As a heating method, you can choose it according to the size of the item.

The step [4] is a step in which the expandable adhesive layer (A) forms the expandable adhesive layer (A1).

In the steps [3] and [4], it is preferable that in the process of stimulating the adhesive tape to expand the expandable adhesive layer (A) to form the expandable adhesive layer (A1), The adhesive tape applies a load of 50 N/cm ² or less, preferably 25 N/cm ² or less. If a load of 10 N/cm ² or less is applied, it can be preferably buried so that two or more adhesive tapes having the above-mentioned It is preferable because the gap is created when the ends of the adhesive tape of the expandable adhesive layer (A) are close to each other.

As a method of manufacturing the article, if the steps [1], [2], [3] and [4] are performed in this order, before stimulation is given to form the expanded adhesive layer (A1) It is preferred that it has excellent adhesion, can expand by stimulation, and also exhibits excellent adhesion after expansion. Especially when the surface of the adherend (C1) or the adherend (C2) is a rough surface, it is effective in exhibiting good adhesive force.

In the present invention, by the force generated by expanding the expandable adhesive layer (A), the adhesive layer (A1) or the adhesive layer (B) and the adherend ( C1) other parts (c1-2) or other connected body (C2) press catch. Therefore, for example, when the adherend (C1) has a gap or there is a gap between the adherend (C1) and the adherend (C2), there is no need to use a punch or the like to apply pressure. Furthermore, the adhesive tape and the adherend are in close contact with each other due to the force generated by the expansion. Therefore, even if a person with an uneven surface (a rough surface) is used as the adherend, the tape will not be easily adhered. A gap is formed between the bonded body and the bonded body.

Examples of the adherend (C1) and the adherend (C2) include glass, metals such as aluminum, and plastics including resins such as acrylic and polycarbonate. As the adherend body (C1) and the adherend body (C2), those having the same material or shape may be used, or those having different materials or shapes may be used.

As the adherend (C1) and the adherend (C2), the surface in contact with the expandable adhesive layer (A) or the adhesive layer (B) may be a rough surface.

The shapes of the adherends (C1) and the adherends (C2) are not particularly limited. Examples thereof include: two-dimensional shapes, three-dimensional shapes (curved surfaces, etc.), shapes with surface irregularities, and fitting shapes. shape etc. A combination of the above shapes is also possible.

The adherend may have, for example, minute irregularities of 1 μm or less on the surface of the adherend, or irregularities of 1 μm or more such as embossing or printing steps, or the adherend itself may have warping or deformation. . The unevenness is preferably 500 μm or less, more preferably 400 μm or less, and still more preferably 300 μm or less. The warpage or deformation of the adherend is preferably for bonding the adhesive tape to the adherend. If the difference between the highest point and the lowest point is 500 μm or less, it is more preferably 400 μm or less. If it is 300 μm or less, it is easy to make the above Then there is a gap when the ends of the tape are arranged close to each other, or the adherend (C1) has a gap, or there is a gap between the adherend (C1) and the adherend (C2), and the height of the gap ( When the adhesive tape is thicker, it is more preferable because it can be fully adhered when the adhesive tape is stimulated to expand.

Furthermore, the adherend may be a combination of curved surfaces, and the curved surfaces may have the same curvature radius or may have different curvature radii. If the curvature radius is in the range of 0.1 mm to 10 mm, a load of 50 N/cm ² or less can be applied to the bonding tape on one or two adherends that are in contact with the bonding tape. When expanded, good adhesion is obtained. In addition, when the curvature radii of the adherends are different from each other, it is preferably a gap from the surface of the adhesive tape to the other adherend of the adherend to which the adhesive tape is attached. It is 500 μm or less, more preferably 400 μm or less. If it is 300 μm or less, there is a gap even when the ends of the bonding tape are arranged close to each other, or the adherend (C1) has a gap, or there is a gap in the adherend. When there is a gap between (C1) and the adherend (C2), and the height (thickness) of the gap is large, sufficient adhesion can be achieved when the adhesive tape is stimulated to expand, so it is further preferable. .

The adhesive tape used in the present invention can be expanded by applying heat to the thermoplastic heat-expandable adhesive layer (A) or the entire adhesive tape.

The adhesive tape used in the present invention has an expandable adhesive layer (A) that expands due to stimulation. The expandable adhesive layer (A) may be one type or two or more types, or may be a single layer or two layers. layer or above. Furthermore, the adhesive tape may include only the The expandable adhesive layer (A) may also include the expandable adhesive layer (A) and an adhesive layer that is not easily expanded (such as the adhesive layer (B) described below). If it includes the expandable adhesive layer (A), The adhesive layer (A) and the adhesive tape of the adhesive layer that is not easily expanded are used to create gaps between the adherend (C1) or the adherend (C1) and the adherend by the expansion of the adhesive tape. It is preferred that the gaps between the bodies (C2) are filled and firmly bonded.

As an adhesive tape including the expandable adhesive layer (A) and an adhesive layer that is not easily expanded, specifically, it is preferable to use an adhesive tape having an adhesive layer described below on at least one side of the expandable adhesive layer (A). Agent layer (B). As the adhesive tape, if the expandable adhesive layer (A) is attached to the adherend in advance before the expansion, the expanded adhesive layer (A1) after maintaining the expansion will be It is preferable in terms of excellent adhesion between the adherends.

(Expansive adhesive layer (A))

The expandable adhesive layer (A) is a layer capable of expanding due to stimulation. Examples of the stimulus include heat and/or light, and heat is preferred. As the expandable adhesive layer (A), it is preferable to use the expansion ratio in the thickness direction of the expandable adhesive layer (A) [thickness of the expandable adhesive layer (A) after heating and standing/ The thickness of the expandable adhesive layer (A) before standing is 120% or more × 100. The expansion rate is preferably above 150%, and more preferably between 200% and 1000%. In the case of the bonding tape, even when the ends of the bonding tape are arranged close to each other, there is a gap, or the body to be adhered (C1) has a gap, or there is a gap between the body to be bonded (C1) and the body to be bonded (C2). ), and the height (thickness) of the gap is large, By expanding the adhesive tape, another adherend can be preferably fixed in the gap or the adhesive tape can be filled in the gap. Moreover, with the adhesive tape, even if the surface of the adherend is a rough surface, another adherend can be preferably fixed to the rough surface.

In addition, the expansion rate refers to the expansion caused by the expansion of the expandable adhesive layer (A) due to the expansion of the adhesive tape at a temperature of 50°C to 150°C for 30 minutes. The ratio of the thickness of the adhesive layer (A1) to the thickness of the expandable adhesive layer (A) before being left (before expansion) is preferably between 60°C and 145°C, more preferably between 70°C and 145°C. at a temperature of 140°C.

As the expandable adhesive layer (A), in terms of imparting a level of adhesiveness that can be temporarily attached to the adherend even before heating, it is preferable to use an adhesive layer in a 180-degree direction at a speed of 300 mm/minute. The adhesive force during peeling is 0.5N/20mm or more, more preferably 1N/20mm or more, more preferably 2N/20mm or more, and if 3N/20mm or more is used, it will prevent the adhesive tape from being It is further advantageous in terms of peeling off or positional deviation of the subsequent body.

The thickness of the expandable adhesive layer (A) before expansion is preferably in the range of 10 μm to 300 μm, more preferably in the range of 20 μm to 250 μm. If it is in the range of 30 μm to 200 μm, it is easy to make the adhesive tape There is a gap when the ends are arranged close to each other, or the body to be connected (C1) has a gap, or there is a gap between the body to be connected (C1) and the body to be connected (C2), and the height (thickness) of the gap is large In the case of , it is also possible to better fix another adherend in the gap by expanding the adhesive tape or to fill the gap with the adhesive tape, so Better.

On the other hand, the thickness of the expanded adhesive layer (A1) formed by expansion of the expandable adhesive layer (A) is preferably in the range of 20 μm to 3000 μm. If it is in the range of 40 μm to 2500 μm, then the thickness of the expanded adhesive layer (A1) is obtained. It is better in terms of better adhesion. Furthermore, the expanded adhesive layer (A1) preferably has a porous structure.

Furthermore, as the adhesive tape, it is preferable to use one whose thickness of the expandable adhesive layer (A) is 10% or more relative to the total thickness of the adhesive tape. If it is 30% or more, it is easier to use the adhesive tape. It is better to fix another adherend in the gap or to fill the gap with the bonding tape.

As the expandable adhesive layer (A), an adhesive force capable of being adhered to the object to be adhered in advance as described above and an adhesive force that can be generated by expansion of the expandable adhesive layer (A) is used. Pressure is used to fill and connect the gaps in the adherend (C1) or the gaps between the adherend (C1) and the adherend (C2).

The expandable adhesive layer (A) can be produced by applying an adhesive composition (a) described below on a support such as a release liner or an adhesive tape and drying it.

The expandable adhesive layer (A) can be formed using an adhesive composition (a) containing a thermoplastic resin, for example. The content of the thermoplastic resin is preferably 50 mass% or more, more preferably 75 mass% or more, and still more preferably 90 mass% or more with respect to the total solid content of the adhesive composition (a).

As the thermoplastic resin, one that can easily expand by heating can be used.

The thermoplastic resin preferably has a storage elastic modulus G23 in the range of 1.0×10 ³ Pa to 5.0×10 ⁷ Pa measured by a dynamic viscoelastic spectrum (spectrum) at 1 Hz and 23° C., and is relatively It is preferable to use a storage elastic modulus G70 in the range of 1.0×10 ² Pa to 1.0×10 ⁷ Pa measured by dynamic viscoelasticity spectroscopy at 1 Hz and 70°C, and if using dynamic viscoelasticity at 1 Hz and 120°C, If the storage elastic modulus G120 measured by the elastic spectrum is in the range of 1.0×10 ² Pa to 1.0×10 ⁶ Pa, the adhesive tape can be prevented from peeling off or positional deviation from the adherend even before heating, and , it is particularly preferable to use an adhesive tape that can expand to a level that can fully fill the gaps.

The adhesive tape in the state before expansion of the thermoplastic heat-expandable adhesive layer (A) can prevent the adhesive tape from peeling off or positional deviation from the adherend even before heating, and can suppress shrinkage in a normal temperature environment after expansion. In terms of other aspects, the storage elastic modulus G23 measured by dynamic viscoelastic spectrum at 1 Hz and 23°C can be used. The storage elastic modulus G23 is preferably 1.0×10 ³ Pa~5.0×10 ⁷ Pa, and more preferably 5.0×10 ³ Pa~ 1.0×10 ⁷ Pa, preferably a thermoplastic resin of 5.0×10 ³ Pa to 5.0×10 ⁶ Pa.

Furthermore, in terms of suppressing expansion in the planar direction (flow direction or width direction) of the adhesive tape and allowing expansion in the thickness direction of the adhesive tape, it is preferable to use a thermoplastic resin having a temperature range of 1 Hz and 1 Hz within the above range. The storage elastic modulus measured by the dynamic viscoelastic spectrum at 23°C is G23 and the storage elastic modulus measured by the dynamic viscoelastic spectrum at 1 Hz in the range of 70°C to 120°C is 1.0×10 ² Pa to 1.0×10 ⁷ Pa. range person.

As the thermoplastic resin, the storage elastic modulus G70 measured by dynamic viscoelasticity spectrum at 1 Hz and 70° C. is preferably 1.0×10 ² Pa to 1.0×10 ⁷ Pa, more preferably 5.0×10 ² Pa to 5.0×10 ⁶ Pa, preferably 5.0×10 ² Pa~1.0×10 ⁶ Pa.

Furthermore, as the thermoplastic resin, the storage elastic modulus G70 measured by dynamic viscoelasticity spectrum at 1 Hz and 70° C. is preferably 1.0×10 ² Pa to 1.0×10 ⁷ Pa, more preferably 5.0×10 ² Pa~5.0×10 ⁶ Pa, preferably 5.0×10 ² Pa~1.0×10 ⁶ Pa.

Moreover, the storage elastic modulus G120 of the thermoplastic resin measured using the dynamic viscoelastic spectrum at 1 Hz and 120°C is preferably 1.0×10 ² Pa~1.0×10 ⁶ Pa, and more preferably 5.0×10 ² Pa~5.0 ×10 ⁶ Pa, more preferably 5.0×10 ² Pa to 2.0×10 ⁵ Pa.

The storage elastic modulus G120 of the thermoplastic resin is preferably smaller than the storage elastic modulus G70, and the storage elastic modulus G70 is preferably smaller than the storage elastic modulus G23.

In addition, the storage elastic modulus G23, the storage elastic modulus G70, and the storage elastic modulus G120 were measured using a commercially available viscoelasticity testing machine using the method described in the Examples described below. As a test piece for the measurement, one obtained by heating the thermoplastic resin (expanding agent-free) contained in the thermoplastic heat-expandable adhesive layer (A), applying it to a release liner, and cooling it was used. A test piece with a thickness of 2 mm.

As the thermoplastic resin, for example, it is preferable to use one that has excellent adhesion before expansion, softens at the expansion start temperature of the expansion agent, makes the expansion agent easy to expand, and exhibits excellent adhesion after expansion.

Examples of the thermoplastic resin include polyurethane Urethane resins such as (polyurethane, PU) and thermoplastic polyurethane (TPU); polycarbonate (PC); polyvinyl chloride (PVC), vinyl chloride- Vinyl chloride resins such as vinyl acetate copolymer resin; acrylic resins such as polyacrylic acid, polymethacrylic acid, polymethyl acrylate, poly(methyl methacrylate) (PMMA), polyethyl methacrylate, etc. ; Polyethylene terephthalate (PET), polybutylene terephthalate, polytrimethylene terephthalate (polytrimethylene terephthalate), polyethylene naphthalate, polynaphthalate Polyester resins such as butylene glycol ester; polyamide resins such as nylon (registered trademark); polystyrene (PS), imide modified polystyrene, and acrylonitrile. Butadiene. Styrene (Acrylonitrile Butadiene Styrene, ABS) resin, imide modified ABS resin, styrene. Acrylonitrile copolymer (Styrene Acrylonitrile, SAN) resin, acrylonitrile. Ethylene-propylene-diene. Polystyrene resins such as styrene (acrylonitrile.ethylene-propylene-diene.styrene, AES) resin, polyethylene (polythelyne, PE) resin, polypropylene (polypropylene, PP) resin, cyclic olefin resin and other olefin resins; nitrocellulose Cellulose-based resins such as nitrocellulose and cellulose acetate; silicone-based resins; thermoplastic resins such as fluorine-based resins, styrene-based thermoplastic elastomers, olefin-based thermoplastic elastomers, vinyl chloride-based thermoplastic elastomers, and urethane Thermoplastic elastomers such as ester thermoplastic elastomer, ester thermoplastic elastomer, and amide thermoplastic elastomer.

As the thermoplastic resin, among these, styrenic thermoplastic resin is particularly preferred. Plastic elastomers, olefin-based thermoplastic elastomers, vinyl chloride-based thermoplastic elastomers, ester-based thermoplastic elastomers, urethane-based thermoplastic elastomers, amide-based thermoplastic elastomers, or acrylic resins, etc., especially those using benzene Ethylene thermoplastic elastomer or acrylic resin.

Examples of the styrenic thermoplastic elastomer include styrene-based AB diblock copolymers such as styrene-ethylene-butylene (SEB); styrene-butylene Ethylene-styrene copolymer (styrene-butylene-styrene, SBS), hydrogenation product of SBS (styrene-ethylene-butylene-styrene copolymer (styrene-ethylene-butylene-styrene, SEBS)), styrene-iso- Pentadiene-styrene copolymer (styrene-isoprene-styrene, SIS), hydrogenation product of SIS (styrene-ethylene-propylene-styrene copolymer (SEPS)), styrene- Styrene-based ABA-type triblock copolymers such as isobutylene-styrene copolymer (styrene-isbutylene-styrene, SIBS); styrene-butadiene-styrene-butadiene (SBSB) ) and other styrene-based ABAB-type tetrablock copolymers; styrene-based ABABA-type pentablock copolymers such as styrene-butadiene-styrene-butadiene-styrene (styrene-butadiene-styrene-butadiene-styrene, SBSBS) Segment copolymer; styrenic multi-block copolymer having these or more AB repeating units; ethylenic double bonds of styrene-based random copolymers such as styrene-butadiene rubber (SBR) Hydrogenation products obtained by hydrogenation, etc. As the styrenic thermoplastic elastomer, commercially available products can be used.

As the acrylic resin, for example, one obtained by polymerizing a monomer containing alkyl (meth)acrylate can be used.

As the (meth)acrylic acid alkyl ester, it is preferable to use a (meth)acrylate having an alkyl group having 4 to 12 carbon atoms. Specifically, it is preferable to use butyl (meth)acrylate, Isooctyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, etc., more preferably, butyl acrylate and 2-ethylhexyl acrylate are used alone or in combination.

Furthermore, as the monomer, in addition to the above-mentioned monomers, acrylonitrile, (meth)acrylic acid, maleic anhydride, acrylamide, itaconic acid, styrene, vinyl acetate, etc. can also be used.

Moreover, the said expandable adhesive layer (A) can be formed using the adhesive composition (a) containing a thermosetting resin, for example. The content of the thermosetting resin is preferably 50 mass% or more, more preferably 75 mass% or more, and still more preferably 90 mass% or more with respect to the total solid content of the adhesive composition (a).

As the thermosetting resin, urethane resin, phenol resin, unsaturated polyester resin, epoxy resin, acrylic resin, etc. can be used. Among them, for example, two or more bisphenol A-type epoxy resins, bisphenol F-type epoxy resins, bisphenol S-type epoxy resins, hydantoin-type epoxy resins, and biphenyl can be used alone or in combination. type epoxy resin, alicyclic epoxy resin, triphenylmethane type epoxy resin, phenol novolak type epoxy resin, cresol novolac type epoxy resin, naphthol novolac type epoxy resin, dicyclopentadienyl Olefin/phenol epoxy resin, alicyclic amine epoxy resin, aliphatic amine epoxy resin, and CTBN modified (carboxyl-terminated butadiene nitrile (carboxyl-terminated butadiene nitrile) modified) or halogen modified epoxy resin oxygen Resin etc.

The adhesive composition (a) may contain a swelling agent. As the expansion agent, it is preferable to use one that can form a porous structure as the expanded thermoplastic thermal expansion adhesive layer (A1). For example, inorganic compounds such as ammonium carbonate, ammonium bicarbonate, ammonium nitrite, ammonium borohydride, and azide can be used. Compounds, fluorinated alkanes such as trichlorofluoromethane, azo compounds such as azobisisobutyronitrile, hydrazine compounds such as p-Toluenesulfonyl Hydrazide, p-Toluenesulfonyl Semicarbazide and other semi-trap compounds, triazole compounds such as 5-morpholino-1,2,3,4-thitriazole, N-nitroso compounds such as N,N'-dinitrosoterephthalamide and other .

Furthermore, the expansion agent is preferably a thermal expansion agent that expands by heat, and for example, expandable capsules such as thermally expandable capsules obtained by microencapsulating a hydrocarbon solvent can be used. As the thermal expansion agent, one capable of generating gas and expanding at temperatures around the softening point of the thermoplastic resin or the thermosetting resin is preferably used. The expansion start temperature of the thermal expansion agent is preferably 50°C or higher, more preferably 60°C or higher. If it is 70°C or higher, the stability during storage will be excellent and the adherend with low heat resistance will not be damaged. It is preferable to fully expand the adhesive tape so that excellent adhesive force can be obtained after expansion.

As the expansion agent, among the above, if a thermally expandable capsule obtained by microencapsulating a hydrocarbon solvent is used, it is useful in preventing, for example, deterioration of the expandable adhesive layer (A) due to the influence of heat, etc. Even better. The expansion agent may be used alone or in combination of two or more.

Examples of commercially available heat-expandable capsules include Expa Expancel (manufactured by Japan Fillite Co., Ltd.), Matsumoto microsphere (Matsumoto Oils and Fats Pharmaceutical Co., Ltd.), microspheres (manufactured by Kureha Co., Ltd.), etc.

As the heat-expandable capsule, Matsumoto microspheres F-30, F-36, F-36D, F-36LV, F-48, F-48D, F- manufactured by Matsumoto Oils & Fats Pharmaceutical Co., Ltd. 50. FN-80GS, F-65; Expancel 053-40, 007-40, 031-40, etc. manufactured by Japan Fillite Co., Ltd., due to the softening of the thermoplastic resin It expands before and after temperature, so it is preferable to suppress the expansion in the plane direction (flow direction or width direction) of the adhesive tape and to more effectively expand in the thickness direction.

As the thermally expandable capsule, it is preferable to use one whose volume after expansion (volume expansion rate) is 8 to 60 times the volume of the capsule before expansion.

The usage amount of the expansion agent is preferably in the range of 0.3 to 30 parts by mass relative to 100 parts by mass of the solid content of the total component of the layer (A). , more preferably in the range of 1 to 20 parts by mass, and even more preferably in the range of 3 to 17 parts by mass. If it is in the range of 5 to 15 parts by mass, it can fully expand to the adherend. It is better because it can fill the gaps it has and obtain better adhesion.

As the adhesive composition (a), in addition to the ones described above, those containing a tackifier, a cross-linking agent, a hardener, a hardening accelerator, etc. may be used as needed.

(Adhesive layer (B))

Furthermore, as the adhesive tape used in the present invention, as mentioned above, it is preferable to use Use the one with adhesive layer (B).

The adhesive layer (B) constituting the adhesive tape can be formed using an adhesive composition (b) capable of forming a layer having adhesiveness or adhesiveness.

As the adhesive layer (B), the expansion coefficient in the thickness direction of the adhesive layer (B) [thickness of the adhesive layer (B) after heating/the thickness of the adhesive layer (B) after being left) can be used. The thickness of the agent layer (B)×100 is 120% or less. The expansion ratio of the adhesive layer (B) is preferably 115% or less, more preferably 110% or less. The adhesive tape described above can maintain excellent adhesive force to the adherend even after the expandable adhesive layer (A) expands. In addition, the expansion rate of the adhesive layer (B) refers to the thickness of the adhesive layer after the adhesive tape is left in an environment of 100° C. for 30 minutes relative to the thickness of the adhesive layer after the adhesive tape is left. The ratio of the thickness of the previous adhesive layer (B).

The thickness of the adhesive layer (B) is preferably in the range of 1 μm to 300 μm. If it is in the range of 5 μm to 200 μm, the expandable adhesive layer (A) constituting the adhesive tape will expand and damage the adherend (C1). ) or the gap between the adherend (C1) and the adherend (C2), it can exhibit excellent performance when the adhesive layer (B) is attached to the adherend (C2). It has great staying power, so it’s better.

As mentioned above, the adhesive layer (B) preferably has a low expansion coefficient and therefore preferably does not substantially contain the expansion agent exemplified as one that can be used when forming the expandable adhesive layer (A).

As the adhesive layer (B), it is preferable to use a resin containing, for example, a thermosetting resin or a thermoplastic resin, and the content of the expansion agent is small or free. The adhesive composition (b) of the expansion agent.

As the resin that can be used in the adhesive composition (b), a conventionally known resin can be selected and used. Among them, as the resin, in terms of improving the production efficiency of the adhesive tape of the present invention, it is preferable to use, for example, an adhesive composition that can be used in the formation of the expandable adhesive layer (A). (a) The thermoplastic resin or thermosetting resin contained in (a) is the same as that shown in the examples.

As the adhesive composition (b), for example, one containing a resin such as the thermoplastic resin and optional tackifier resin, a cross-linking agent, other additives, etc. can be used.

As the tackifying resin, for the purpose of adjusting the strong adhesiveness of the adhesive layer (B), for example, rosin-based tackifying resin, polymerized rosin-based tackifying resin, polymerized rosin ester-based tackifying resin, rosin phenol-based tackifying resin can be used. Tackifying resin, stabilized rosin ester-based tackifying resin, disproportionated rosin ester-based tackifying resin, terpene-based tackifying resin, terpene phenol-based tackifying resin, petroleum resin-based tackifying resin, etc.

As the cross-linking agent, for the purpose of improving the cohesion of the adhesive layer (B), known isocyanate-based cross-linking agents, epoxy-based cross-linking agents, aziridine-based cross-linking agents, and polyvalent metal salts can be used. Cross-linking agent, metal chelate cross-linking agent, ketone. Hydrazine cross-linking agents, oxazoline cross-linking agents, carbodiimide cross-linking agents, silane cross-linking agents, glycidyl (alkoxy) epoxy silane cross-linking agents, etc.

As the additives, alkali (ammonia, etc.) or acid for adjusting pH, foaming agent, plasticizer, softener, antioxidant, glass or plastic may be used as necessary within the range that does not hinder the desired effect of the present invention. Fillers, pigments, dyes, etc. in the form of fibers, balloons, beads, metal powders, etc. Agents, pH adjusters, film-forming auxiliaries, leveling agents, thickeners, water-repellent agents, defoaming agents and the like are well known.

As the adhesive composition (b), one containing a solvent can be used from the viewpoint of maintaining good coating workability and the like. As the solvent, for example, toluene, xylene, ethyl acetate, butyl acetate, acetone, methyl ethyl ketone, hexane, etc. can be used. Moreover, when a water-based adhesive composition is used as the adhesive composition (b), water or an aqueous solvent containing water as the main component can be used as the solvent.

The adhesive tape used in the present invention can be produced by, for example, step [I] of applying the adhesive composition (a) on a release liner and drying it. The step of forming the expandable adhesive layer (A).

In the adhesive tape used in the present invention, the adhesive tape composed of the expandable adhesive layer (A) and the adhesive layer (B) can be formed by passing through the steps [I], [II] and The step [II] is different from the step [I] in that the adhesive composition (b) is applied to the release liner and dried to form an adhesive. layer (B), the step [III] is a step of transferring the adhesive layer (B) to one side of the expandable adhesive layer (A) and pressing them together.

In addition, it is preferable that the expandable adhesive layer (A) does not substantially expand during the manufacturing process of the adhesive tape.

Furthermore, as the adhesive tape used in the present invention, if necessary, a layer including a nonwoven fabric layer, a resin film layer, or a metal may be used between the expandable adhesive layer (A) and the adhesive layer (B). Z). The adhesive tape has good rigidity, Therefore, the attaching workability is excellent.

As the layer (Z), for example, if it is a non-woven fabric, the material preferably includes pulp, rayon, Musa textilis, acrylonitrile, nylon, polyester, etc., in order to To meet the tensile strength of non-woven fabrics, polyamide can also be added in the papermaking step as needed, and then a one-step impregnation treatment of coating can be performed after drying, or viscose or thermoplastic resin can be used for bonding. 2-step impregnation treatment of binder, etc. Examples of the resin film include resin film layers formed using plastic films such as polyester films, polyethylene films, polypropylene films, polyvinyl chloride films, and polyimide films. Examples of the layer containing metal include aluminum, Copper and other metal layers.

As the layer (Z), it is preferable to use one having a thickness of 1 μm to 200 μm.

The adhesive tape having the layer (Z) can be manufactured, for example, by passing through steps [I], step [II], step [IV] and step [V]. The step [I] is by combining the adhesive tape. The step [II] is different from the step [I] in that the agent composition (a) is coated on the release liner and dried to form an expandable adhesive layer (A). The adhesive composition (b) is coated on the release liner and dried to form the adhesive layer (B). The step [IV] is to apply the adhesive composition (b) to one side of the expandable adhesive layer (A). The step of laminating the layer (Z), and the step (V) is a step of transferring the adhesive layer (B) to the surface including the layer (Z) and press-bonding them.

[Example]

(Preparation Example 1)

<Preparation of adhesive composition (a-1)>

By mixing 100 parts by mass of the styrene-butadiene block copolymer S (a mixture of a triblock copolymer and a diblock copolymer) with a weight average molecular weight of 300,000; relative to the total amount of the mixture, The diblock copolymer accounts for 50% by mass. In the entire styrene-butadiene block copolymer, the polyethylene unit accounts for 30% by mass, and the polybutadiene unit accounts for 30% by mass. The mass ratio of 70% by mass) and 100 parts by mass of terpene phenol-based tackifying resin (softening point 115°C, molecular weight 1000) was dissolved in toluene to obtain adhesive composition (a-1) .

(Preparation Example 2)

<Preparation of adhesive composition (a-2)>

Obtained by the same method as Preparation Example 1 except that the usage amount of the terpene phenol-based thickening resin (softening point 115° C., molecular weight 1000) used in Preparation Example 1 was changed from 100 parts by mass to 65 parts by mass. The adhesive composition (a-2) was obtained.

(Preparation Example 3)

<Preparation of adhesive composition (a-3)>

In a reaction vessel equipped with a stirrer, a reflux cooler, a thermometer, a dropping funnel, and a nitrogen inlet, 44.9 parts by mass of butyl acrylate, 50 parts by mass of 2-ethylhexyl acrylate, 2 parts by mass of acrylic acid, and vinyl acetate 3 parts by mass, 0.1 part by mass of 4-hydroxybutylacrylate, and 0.1 part by mass of 2,2'-azobisisobutyronitrile as a polymerization initiator were dissolved in 100 parts by mass of ethyl acetate, and the process was carried out at 70°C for 10 By polymerizing for 1 hour, an acrylic copolymer Z solution with a weight average molecular weight of 800,000 was obtained.

Next, with respect to 100 parts by mass of acrylic copolymer Z, poly 30 parts by mass of synthetic rosin ester-based tackifying resin D-135 (manufactured by Arakawa Chemical Industry Co., Ltd.) was added to ethyl acetate and mixed, and then "Coronaline" manufactured by Nippon Polyurethane Industry Co., Ltd. 1.1 parts by mass of "Coronate" L-45" (isocyanate cross-linking agent, solid content 45% by mass), and stirred for 15 minutes to obtain an adhesive (a-2).

<Preparation of next tape>

(Creation example 1)

Using a rod-shaped metal applicator, 10 parts by mass of expansion agent F-36D (manufactured by Matsumoto Oils & Fats Pharmaceutical Co., Ltd., thermal expansion agent) was mixed with respect to 100 parts by mass of the total solid content of the adhesive composition (a-1). The microcapsules (initial particle size 10 μm ~ 16 μm, expansion start temperature 70°C ~ 80°C) and stirred for 10 minutes are coated so that the thickness after drying becomes 90 μm. Both sides of the high-quality paper have polyethylene layers, and An expandable adhesive layer ( A-1). The expandable adhesive layer (A-1) was laminated on a release paper different from the above-mentioned release paper, and a 2kg hand roller was used to reciprocate once on the upper surface of the sticker. , thereby obtaining an adhesive tape including the expandable adhesive layer (A-1).

Next, use a rod-shaped metal applicator to apply the adhesive composition (a-1) so that the thickness after drying becomes 90 μm, so that both sides of the fine paper have polyethylene layers, and one side of the polyethylene layer is Cover the surface of a release paper with a silicone-based release treatment agent layer with a thickness of 130 μm, and use a dryer set at 65°C for 10 minutes. By drying, an adhesive layer (B-1) was produced.

The expandable adhesive layer (A-1) was attached to the adhesive layer (B-1) obtained above, and then laminated under pressure at 4 kgf/cm ² to obtain a laminated expandable adhesive layer. Adhesion tape 1 of layer (A-1) and adhesive layer (B-1).

(Creation example 2)

An expandable adhesive layer (A-1) and an adhesive layer (B-1) were produced in the same manner as in Example 1, and the expandable adhesive layer (A-1) was attached to a nonwoven fabric with a thickness of 35 μm. One side, and the adhesive layer (B-1) obtained above was attached to the other side, and then lamination was performed under pressure at 80°C and 4kgf/ ^cm2 , thereby obtaining an expandable adhesive layered on the nonwoven fabric. Adhesive tape 2 for layer (A-1) and adhesive layer (B-1).

(Creation example 3)

Except using the adhesive composition (a-2) instead of the adhesive composition (a-1), in the same manner as in Example 1, an expandable adhesive layer (A-2) and a Adhesive tape for the adhesive layer (B-2). The expandable adhesive layer (A-1) is attached to one side of a non-woven fabric with a thickness of 35 μm, and the adhesive layer (B-1) obtained above is attached to the other side. /cm ² to obtain an adhesive tape 3 in which the expandable adhesive layer (A-1) and the adhesive layer (B-1) were laminated on the nonwoven fabric by pressure lamination.

(Creation Example 4)

The adhesive layer (B-1) was prepared in the same manner as in Example 1, and the adhesive layer (B-1) was attached to one side of a non-woven fabric with a thickness of 35 μm, and the aforementioned obtained layer was attached to the other side. The adhesive layer (B-1) was then pressurized and laminated at 80° C. and 4 kgf/cm ² to obtain an adhesive tape 4 in which the adhesive layer (B-1) was laminated on the nonwoven fabric.

(Creation Example 5)

Except that the adhesive composition (a-3) was used instead of the adhesive composition (a-1), two pieces including the adhesive layer (B-3) were produced in the same manner as in Example 1. Then take it. The adhesive layer (B-3) is attached to one side of a polyethylene foam base material with a thickness of 100 μm, and the adhesive layer (B-3) obtained above is attached to the other side, and then, The adhesive tape 5 in which the adhesive layer (B-3) was laminated|stacked on the foam was obtained by performing pressure lamination at 4kgf/ ^cm2 .

[Manufacturing of items]

(Example 1)

The adhesive tape 1 was cut into a strip shape with a length of 64 mm and a width of 1 mm and a length of 43 mm and a width of 1 mm. The surface side of (A-1) constituting the adhesive tape was attached to a polycarbonate plate 1 having a long side of 65 mm, a short side of 45 mm, and a thickness of 2 mm. At this time, an adhesive tape cut to a length of 64 mm was attached to the long side at a position 1 mm away from the outside of the polycarbonate plate 1, and an adhesive tape cut to a length of 43 mm was attached to the short side to form a frame shape. Then, the adhesive tape cut into a strip shape is attached so that the ends thereof overlap each other. The polycarbonate plate 1 having the adhesive tape and the polycarbonate plate 2 having a long side of 65 mm x a short side of 45 mm x a thickness of 2 mm were laminated, and the polycarbonate plate 1 and the polycarbonate plate 2 were produced by The above frame-shaped test strip is connected to the test piece (Fig. 4). Next, a weight was placed on the entire surface of the adhesive tape attached to the test piece so that the total weight of the polycarbonate plate 1 became 210 g, and a load of 1 N/cm ² was applied to the adhesive tape. , heated in a heating furnace at 100° C. for 30 minutes to expand (A-1), and then left to cool until the test piece cooled to room temperature, thereby obtaining an article.

(Example 2)

An article was obtained in the same manner as in Example 1 except that the adhesive tape 2 was used instead of the adhesive tape 1 .

(Example 3)

An article was obtained in the same manner as in Example 1 except that the adhesive tape 3 was used instead of the adhesive tape 1 .

(Example 4)

The adhesive tape 2 was cut into a strip shape with a length of 64 mm and a width of 1 mm and a length of 43 mm and a width of 1 mm. The surface side of (A-1) constituting the adhesive tape was attached to a polycarbonate plate 1 having a long side of 65 mm, a short side of 45 mm, and a thickness of 2 mm. At this time, an adhesive tape cut to a length of 64 mm was attached to the long side at a position 1 mm away from the outside of the polycarbonate plate 1, and an adhesive tape cut to a length of 43 mm was attached to the short side to form a frame shape. Then, the adhesive tape cut into a strip shape is attached so that the ends thereof overlap each other.

Next, a polycarbonate plate 3 having a size of 65 mm in length x 45 mm in width x 2 mm in thickness and having two wedge-shaped recessed portions (step portions) of 65 mm in length x 5 mm in width and 30 μm in depth on the surface was prepared. The polycarbonate plate 1 and the polycarbonate plate 3 having the test tape are attached so that the two recessed portions overlap the frame of the adhesive tape attached to the polycarbonate plate 1 The polycarbonate plate 1 and the polycarbonate plate 3 were laminated and joined together via the frame-shaped test strip to produce a test piece (Fig. 5). Next, the entire surface of the adhesive tape attached to the test piece is weighed by the total weight of the polycarbonate plate 1. Place a weight so that it becomes 210g, and with a load of 1N applied to the unit area of the adhesive tape, heat it in a heating furnace at 100° C. for 30 minutes to expand (A-1), and then leave it to cool until the test. The piece was cooled to room temperature and the item was obtained.

(Comparative example 1)

An article was obtained in the same manner as in Example 1 except that the adhesive tape 4 was used instead of the adhesive tape 1 .

(Comparative example 2)

An article was obtained in the same manner as in Example 1 except that the adhesive tape 5 was used instead of the adhesive tape 1 .

(Comparative example 4)

An article was obtained in the same manner as in Example 5 except that the adhesive tape 5 was used instead of the adhesive tape 1 .

[Evaluation of waterproofness]

The articles obtained in the Examples and Comparative Examples were left to stand still in a water depth of 1 m for 30 minutes (in compliance with IPX7 of JISC0920). After leaving to stand, the test piece was visually observed and evaluated based on the following evaluation criteria.

○: Water has not penetrated into the inside of the test piece and surrounded by the frame-shaped band (the center part of the test piece).

×: Water penetrated into the inside of the test piece and surrounded by the frame-shaped band (the center part of the test piece).

[Table 1]

1‧‧‧Then bring A

2‧‧‧Then bring B

3‧‧‧The body to be connected

Claims (7)

A method of manufacturing an article that is adhered via an expansion material of an adhesive tape, the method of manufacturing an article being characterized by including: step [1] of making an adhesive layer having an expandable adhesive layer (A) The ends of two or more bonding tapes are arranged to overlap or be close to each other, and one of the surface sides of the bonding tapes is attached to the portion (c1-1) constituting the adherend (C1); step [2], The other side of the adhesive tape is attached to another adherend (C2); step [3], stimulating the expandable adhesive layer (A); and step [4], due to the stimulation , the expandable adhesive layer (A) expands to form the expandable adhesive layer (A1). In the step [3] and the step [4], stimulation is given to the adhesive tape, so that the adhesive tape is When the expandable adhesive layer (A) expands to form the expandable adhesive layer (A1), a load of 1 N/cm ² or more and 50 N/cm ² or less is applied to the adhesive tape. The agent layer (A) contains a thermoplastic resin having a storage elastic modulus of 1.0×10 ² Pa to 1.0×10 ⁷ Pa measured by dynamic viscoelasticity spectroscopy at 1 Hz in the range of 70°C to 120°C. Scope. The method for manufacturing an article as described in claim 1, wherein the expansion ratio in the thickness direction of the expandable adhesive layer (A) [thickness of the thermoplastic thermally expandable adhesive layer (A1) after heating/before heating The thickness of the thermoplastic heat-expandable adhesive layer (A) × 100 is 150% or more. The method for manufacturing an article as described in Item 1 or Item 2 of the patent application, wherein at least one of the face sides of the expandable adhesive layer (A) has a contact For the adhesive layer (B), the expansion coefficient in the thickness direction of the adhesive layer (B) [thickness of the adhesive layer (B1) after heating/thickness of the adhesive layer (B) before heating] × 100 is 120 %the following. The method for manufacturing an article according to claim 1 or 2, wherein the expandable adhesive layer (A) has an adhesive force of 0.5N/20mm or more. The method for manufacturing an article as described in Item 1 or Item 2 of the patent application, wherein the stimulus in step [3] is heat. The manufacturing method of articles described in Item 1 or 2 of the patent application, wherein the expandable adhesive layer (A) contains the thermoplastic resin and the expansion start temperature is in the range of 70°C to 120°C. Layers of thermally expandable capsules. The method for manufacturing an article as described in Item 1 or Item 2 of the patent application, wherein the step [1] includes applying 0.1N/cm ² to the part (c1-1) constituting the adherend (C1). A step of press-bonding the expandable adhesive layer (A) of the adhesive tape with the above force.