WO2014034100A1 - 粘着剤組成物及びレーザー接合用粘着テープ - Google Patents
粘着剤組成物及びレーザー接合用粘着テープ Download PDFInfo
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- WO2014034100A1 WO2014034100A1 PCT/JP2013/005057 JP2013005057W WO2014034100A1 WO 2014034100 A1 WO2014034100 A1 WO 2014034100A1 JP 2013005057 W JP2013005057 W JP 2013005057W WO 2014034100 A1 WO2014034100 A1 WO 2014034100A1
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- Prior art keywords
- pressure
- sensitive adhesive
- adhesive composition
- styrene
- weight
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J153/00—Adhesives based on block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
- C09J153/02—Vinyl aromatic monomers and conjugated dienes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J109/00—Adhesives based on homopolymers or copolymers of conjugated diene hydrocarbons
- C09J109/06—Copolymers with styrene
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
- C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
- C09J2301/416—Additional features of adhesives in the form of films or foils characterized by the presence of essential components use of irradiation
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2453/00—Presence of block copolymer
Definitions
- the present invention relates to a pressure-sensitive adhesive composition and a pressure-sensitive adhesive tape for laser bonding that are used when a predetermined member is bonded using the heat of laser light irradiation.
- LCD TVs mobile phones, smartphones, tablet terminals, digital cameras, portable game machines, etc. have become widespread in recent years, and are indispensable for living.
- These devices are provided with a transparent panel such as a glass plate or an acrylic plate used for a display screen in addition to a housing for accommodating a substrate and the like.
- Black and white printed portions, so-called frame portions, are formed on the peripheral portion of the back surface of the transparent panel so as to hide the peripheral terminals and the like from the front side of the transparent panel.
- the transparent panel on which the frame portion is formed as described above and the casing are generally bonded in many cases, and in this case, an adhesive tape having a width smaller than that of the frame portion is used.
- the total thickness is 500 ⁇ m or less, providing a double-sided pressure-sensitive adhesive tape having a thin total thickness and having a foam layer and excellent removability.
- a double-sided pressure-sensitive adhesive tape formed from a pressure-sensitive adhesive composition containing an acrylic polymer composed of an acid alkyl ester as an essential monomer component, a tackifier resin, and a crosslinking agent is disclosed.
- patent document 2 when making the design layer of a transparent panel visible from the front side, it can be joined using a laser beam without melting or decomposing the design layer, thereby improving the appearance appearance.
- an adhesive tape for laser bonding is provided adjacent to the design layer having laser light impermeability, and the design layer is moved toward the design layer until a predetermined temperature not exceeding the melting or decomposition temperature of the design layer is reached.
- the bonding portion between the transparent panel and the casing has a high level of bonding reliability (impact resistance, cold resistance, waterproofness). Desired.
- the width of the frame portion of the transparent panel is becoming narrower (narrowing the frame). If the width of the frame portion of the transparent panel is reduced, the width of the adhesive tape must be reduced accordingly.
- the width of the adhesive tape is reduced, the effective adhesive area is reduced, so in general, the adhesive strength is reduced and the adhesive reliability is also reduced, and the above-mentioned impact resistance, cold resistance and waterproofness are sufficiently satisfied. Can not be.
- the transparent panel after bonding the transparent panel and the housing with adhesive tape, for example, if a defect is found in the transparent panel or substrate after product inspection, or if the bonding operation fails, the transparent panel is mounted on the housing. Sometimes it can be peeled off from the body and reused, but if the adhesive tape remains on the transparent panel or casing at this time, it becomes an obstacle to reuse. There is a problem that the adhesive tape must be gradually peeled off.
- the base material of the adhesive tape is a foam layer
- the tensile strength is weak.
- the adhesive layer of the adhesive tape can be easily peeled off from the transparent panel, the adhesive tape has a Part may remain. Even if you pull the remaining adhesive tape to pull it, it will break immediately. is there.
- Patent Document 2 the design layer adjacent to the adhesive tape is irradiated with laser light to generate heat, and the heat is used to soften the adhesive layer. Although reliability increases to a certain extent, there is a concern that the adhesive strength and waterproofness may decrease due to the narrow frame.
- the present invention has been made in view of the above points, and its object is to provide sufficient impact resistance, cold resistance and waterproofness even when the effective adhesion area becomes narrow, for example, as a narrow frame.
- the adhesive reliability is improved, and the adhesive layer made of the adhesive composition is hardly broken when the bonded member is peeled off, and the adhesive layer can be easily peeled off from the member.
- the 1st invention is arrange
- the pressure-sensitive adhesive composition is heated by the irradiation heat of the laser light applied to the design layer of the first member,
- the temperature of the pressure-sensitive adhesive composition is 25 ° C.
- the 180-degree peeling adhesive strength from the stainless steel plate is 20 N / 25 mm or more
- the destructive phenomenon of the pressure-sensitive adhesive composition is interfacial peeling.
- the temperature of the pressure-sensitive adhesive composition is 100 ° C.
- the 180-degree peeling adhesive strength from the stainless steel plate is 10 N / 25 mm or less, and the destructive phenomenon of the pressure-sensitive adhesive composition is interfacial peeling. To do.
- a laser is applied to the design layer of the first member with the pressure-sensitive adhesive composition disposed between the first member and the second member.
- laser light is absorbed by the design layer to generate heat, and this heat is transmitted to the pressure-sensitive adhesive composition, and the pressure-sensitive adhesive composition is heated and softened.
- the adhesive surface of the first member or the second member has irregularities or steps, the pressure-sensitive adhesive composition is easily deformed so as to conform to the shape of the irregularities or steps by the softening of the pressure-sensitive adhesive composition, and adheres without gaps. Thereby, it becomes possible to obtain high waterproofness between the first member and the second member.
- the adhesive strength is as high as 20 N / 25 mm or more when peeled off from the stainless steel plate, so that sufficient adhesive strength is ensured even if the temperature is lowered. It is possible to obtain high cold resistance and impact resistance.
- the design layer is again irradiated with laser light.
- the adhesive composition is softened as described above.
- the 180-degree peeling adhesive strength from the stainless steel plate is 10 N / 25 mm or less, and exhibits the phenomenon of interfacial debonding, so the first member is the second member.
- the pressure-sensitive adhesive composition remains in the first member, for example, when the temperature of the pressure-sensitive adhesive composition is 25 ° C., the phenomenon of interfacial peeling is exhibited.
- the pressure-sensitive adhesive layer made of the pressure-sensitive adhesive composition is peeled from the first member without breaking. Therefore, it is possible to easily peel off all of the remaining pressure-sensitive adhesive composition without using a solvent or applying heat.
- the tensile strength of the dumbbell-shaped No. 3 having a thickness of 100 ⁇ m formed by the pressure-sensitive adhesive composition is 5 MPa or more and the elongation is 800% or more.
- the pressure-sensitive adhesive composition is stretched and peeled off from the member. It is characterized by.
- a fourth invention in the first invention, It contains a styrene / butadiene / styrene copolymer and a terpene tackifier.
- the content of the terpene tackifier is 60 parts by weight or less of the styrene / butadiene / styrene copolymer.
- the adhesive strength becomes insufficient and the adhesion reliability is lowered. By doing so, it becomes possible to obtain sufficient adhesive strength.
- the diblock component in the styrene / butadiene / styrene copolymer is 40 parts by weight or more and less than 60 parts by weight.
- This configuration makes it possible to further increase the adhesive strength.
- the seventh invention is a pressure-sensitive adhesive tape for laser bonding, characterized in that the pressure-sensitive adhesive composition according to any one of the first to sixth inventions is used.
- the first invention even when the effective bonding area becomes narrow, sufficient impact resistance, cold resistance, and waterproofing are obtained to improve the adhesion reliability, and when the first member is peeled off from the second member.
- the pressure-sensitive adhesive layer made of the pressure-sensitive adhesive composition is difficult to break and can be easily peeled off.
- the second invention sufficient strength can be ensured even after the pressure-sensitive adhesive composition has been cooled, so that the pressure-sensitive adhesive composition can be easily peeled off from the first member or the second member.
- the pressure-sensitive adhesive composition when a tensile force is applied to a part of the pressure-sensitive adhesive composition sandwiched between the first member and the second member and adhered to both members, the pressure-sensitive adhesive composition is stretched. Since the interface peels from the member, it can be peeled cleanly with a simple operation.
- the adhesion reliability can be further improved.
- a laser that has high adhesion reliability and can easily peel the first member from the second member. It can be set as the adhesive tape for joining.
- the pressure-sensitive adhesive composition according to the embodiment of the present invention is disposed between the first member and the second member having translucency, and is heated by the irradiation heat of the laser light applied to the design layer of the first member. It is an adhesive composition that is softened.
- the first member is, for example, a transparent panel made of a glass plate or an acrylic plate used for a display screen of a liquid crystal television, a mobile phone, a smartphone, a tablet terminal, a digital camera, a portable game machine, etc. It may be.
- the transparent panel has a laser beam transmission property that allows the laser beam to pass therethrough.
- the laser light transmission includes not only the case of transmitting all of the irradiated laser light but also the case of slightly absorbing the irradiated laser light.
- a black or white printed portion is provided as a frame portion on the periphery of the transparent panel.
- This printed portion is composed of a design layer having laser beam impermeability that does not transmit laser light.
- the laser beam non-transmission includes not only the case of absorbing all of the irradiated laser beam but also the case of slightly transmitting the irradiated laser beam.
- the second member is a housing that accommodates, for example, the substrate of the device.
- the housing may have a laser beam transparency, or may have a laser beam opaqueness.
- the 180-degree peeling adhesive strength from the stainless steel plate is 20 N / 25 mm or more, and the destructive phenomenon of the pressure-sensitive adhesive composition is interfacial peeling.
- the temperature of the pressure-sensitive adhesive composition is 100 ° C.
- the 180-degree peeling adhesive strength from the stainless steel plate is 10 N / 25 mm or less, and the destructive phenomenon of the pressure-sensitive adhesive composition is interfacial peeling.
- the component is set to the content and the content is set.
- the temperature of the pressure-sensitive adhesive composition is 25 ° C., it is preferably 30 N / 25 mm or more as the 180-degree peeling adhesive strength from the stainless steel plate. If it is more than this level, a transparent panel and a housing
- the test method for obtaining 180 degree peeling adhesive strength is as follows. A test piece having a width of 25 mm is attached to a stainless steel SUS304BA steel sheet in accordance with JIS Z 0237, and 180 degree at a peeling speed of 300 mm / min at temperatures of 25 ° C and 100 ° C. The peel resistance value when peeling in the direction was measured (unit: N / 25 mm).
- the pressure-sensitive adhesive composition has its constituents set such that the tensile strength of the 100 ⁇ m-thick dumbbell-shaped No. 3 formed by the pressure-sensitive adhesive composition is 5 MPa or more and the elongation is 800% or more, The amount is set.
- This tensile strength is preferably 7 MPa or more.
- the pressure is less than 5 MPa, the tensile strength of the pressure-sensitive adhesive layer constituted by the pressure-sensitive adhesive composition is insufficient.
- the pressure-sensitive adhesive layer is pulled with a finger, there is a high possibility of breakage.
- the transparent panel has a narrow frame, the bondable width is narrowed and the frame is easily broken.
- the elongation is preferably 1000% or more. If the elongation is less than 800%, the pressure-sensitive adhesive layer made of the pressure-sensitive adhesive composition is hardened, so that the impact resistance and low-temperature characteristics (cold resistance) are reduced, and the transparent panel is encased when the device falls at low temperatures. Since there is a possibility of peeling from the body, it is not preferable.
- Tensile strength and elongation were tested by measuring strength and elongation when a dumbbell-shaped No. 3 test piece having a thickness of 100 ⁇ m was pulled at a temperature of 20 ° C. and a pulling speed of 500 mm / min in accordance with JIS K 6251.
- the pressure-sensitive adhesive composition contains styrene / butadiene / styrene copolymer and a terpene-based tackifier as essential components.
- the main adhesive component is a styrene / isoprene / styrene copolymer used as the main component of hot melt
- the main adhesive component is styrene / butadiene / styrene copolymer when compared with the 180 degree peeling adhesive strength. Smaller than the one used. Therefore, the main adhesive component is preferably a styrene / butadiene / styrene copolymer.
- a reactive hot melt adhesive it may be possible to use a UV curable acrylic hot melt as a main component, but this is not preferable for the following reason.
- a UV curable acrylic hot melt it is necessary to directly irradiate the sheet or tape with ultraviolet rays in order to develop adhesiveness.
- the transparent panel or the case is bonded. In this case, it is difficult to irradiate ultraviolet rays from the transparent panel side or the housing side.
- the softening point is often high, and the temperature of 100 ° C. or more is required to melt and solidify the hot-melt. This is not suitable because it is necessary to increase the temperature until a high temperature is reached, and it may adversely affect other components (liquid crystal display device, touch panel sensor) due to heat.
- the main component is a polyethylene-based hot melt adhesive or a polypropylene-based hot melt adhesive
- the adhesiveness at high temperature is deteriorated, and further, it becomes brittle at low temperature, so the usable temperature range is narrow and not suitable.
- a tackifier so-called tackifier, is added to the pressure-sensitive adhesive composition in order to impart tackiness and flexibility.
- the peeling adhesive strength is 32 N / 25 mm (YShara Chemical Co., Ltd. YS Polystar T-115), but even with a natural type tackifier.
- Special rosin ester that is not a terpene resin (Arakawa Chemical Industry Co., Ltd., Super Ester A-115) has the same 28N / 25mm, and aliphatic hydrocarbon resin (Tonen Petrochemical Co., Ltd.
- Escolez 1304) has the same 3N / 25mm, fat
- the cyclic hydrocarbon resin (Arakawa Chemical Industries, Ltd., Alcon M115) has 10N / 25mm and 180 degree peeling adhesive strength that can be obtained with any terpene resin no matter which terpene resin is used. Cann't get.
- the content of the terpene resin is 60 parts by weight or less of the styrene / butadiene / styrene copolymer.
- the diblock component in the styrene / butadiene / styrene copolymer is 40 parts by weight or more and less than 60 parts by weight.
- the terpene resin has the effect of reducing the viscoelasticity in the normal temperature region and imparting tackiness. However, when more terpene resin is added than 60 parts by weight of the styrene / butadiene / styrene copolymer, Then, the glass transition point is raised. That is, when the pressure-sensitive adhesive composition becomes hard in a low temperature region, cold resistance is lowered.
- the pressure-sensitive adhesive composition becomes hard and the wettability is deteriorated, so that the adhesive strength in the normal temperature region is lowered.
- the pressure-sensitive adhesive composition becomes hard, it becomes weak against impact in a low temperature region.
- the adhesive layer becomes soft and the cohesive force at room temperature is reduced, so that the adhesive strength is reduced by peeling 180 degrees.
- the pressure-sensitive adhesive composition has an appropriate cohesive force in the room temperature region while ensuring the softness of the pressure-sensitive adhesive composition in the low temperature region. It can be a composition.
- a light stabilizer For the purpose of enhancing the stability of the obtained pressure-sensitive adhesive composition, it is possible to add a light stabilizer, an antioxidant, and a heat stabilizer within a general range.
- light stabilizers include benzotriazole ultraviolet absorbers and hindered amine light stabilizers.
- antioxidant include phenol-based, phosphorus-based, and amine-based agents.
- a dye or pigment may be added for coloring to the extent that the physical properties of the pressure-sensitive adhesive composition are not hindered.
- fillers may be blended so as not to affect the physical properties.
- At least one selected from the group consisting of a conductive agent, a flame retardant, an antistatic agent, a crosslinking agent, and a plasticizer can be mixed.
- the pressure-sensitive adhesive composition may be used as it is, or the pressure-sensitive adhesive composition may be used for laser bonding pressure-sensitive adhesive tape. This laser bonding adhesive tape can be used.
- the adhesive composition When the adhesive composition is disposed between the transparent panel and the housing and the design layer of the transparent panel is irradiated with laser light, the laser light is absorbed by the design layer and heat is generated.
- the pressure-sensitive adhesive composition is heated and softened by being transmitted to the pressure-sensitive adhesive composition.
- the transparent panel or the housing has irregularities or steps, the pressure-sensitive adhesive composition is easily deformed so as to conform to the shapes of the irregularities or steps by the softening of the pressure-sensitive adhesive composition. This makes it possible to obtain high waterproofness between the transparent panel and the housing.
- the adhesive strength is as high as 20 N / 25 mm or more when peeled off from the stainless steel plate, so that sufficient adhesive strength is ensured even if the temperature is lowered. It is possible to obtain high cold resistance and impact resistance.
- the design layer is irradiated again with the laser beam.
- the adhesive composition is softened as described above. Specifically, heating is performed until the temperature of the pressure-sensitive adhesive composition reaches 100 ° C. or higher, but the upper limit temperature is set so as not to affect the internal substrate and the liquid crystal display device.
- the temperature of the pressure-sensitive adhesive composition is 100 ° C.
- the 180 ° peel-off adhesive strength from the stainless steel plate is 10 N / 25 mm or less, and the phenomenon of interfacial debonding is exhibited. It can be peeled off.
- the pressure-sensitive adhesive composition remains on the transparent panel, for example, when the temperature of the pressure-sensitive adhesive composition is 25 ° C., the phenomenon of interfacial delamination is exhibited.
- the pressure-sensitive adhesive layer made of the pressure-sensitive adhesive composition is peeled off from the transparent panel without breaking. Therefore, it is possible to easily peel off all of the remaining pressure-sensitive adhesive composition without using a solvent or applying heat.
- a tensile force may be applied by picking a part of the adhesive composition.
- the pressure-sensitive adhesive composition is peeled off from the transparent panel or casing without stretching and tearing from where the tensile force is applied, and eventually all the pressure-sensitive adhesive composition is peeled off from the transparent panel or casing.
- the pressure-sensitive adhesive composition is configured as described above. Accordingly, when the pressure-sensitive adhesive composition is pulled and peeled from the transparent panel or casing, a part of the pressure-sensitive adhesive composition does not remain on the transparent panel or casing, and it is not necessary to use a solvent or the like.
- the pressure-sensitive adhesive composition according to the present embodiment even when the effective bonding area is narrowed, sufficient impact resistance, cold resistance, and waterproofing are obtained to increase the bonding reliability, and the transparent panel is encased.
- the pressure-sensitive adhesive layer made of the pressure-sensitive adhesive composition is not easily broken and can be easily peeled off.
- styrene / butadiene / styrene copolymer having 78% diblock component so-called SBS (D-1118 manufactured by Kraton) and 44 parts by weight of styrene / butadiene / styrene copolymer having 15% diblock component (TR2601 manufactured by JSR Corporation)
- SBS SBS
- styrene / butadiene / styrene copolymer having 15% diblock component TR2601 manufactured by JSR Corporation
- a tackifier 50 parts by weight of terpene phenol resin (YS Polystar T-115 manufactured by Yasuhara Chemical Co., Ltd.), 10 parts by weight of oil (LBR-305 manufactured by Kuraray Co., Ltd.), antioxidant (Irganox 1010 manufactured by Ciba Japan Co., Ltd.) 1 part by weight was dissolved in toluene to prepare a pressure-sensitive adhesive solution having a solid content of 40 parts by weight.
- an adhesive layer having a thickness of 100 ⁇ m was prepared by applying and drying the release PET film so that the dry film had a thickness of 100 ⁇ m.
- the pressure-sensitive adhesive composition having a thickness of 100 ⁇ m obtained as described above is disposed between two polycarbonate plates having a thickness of 2 mm, and a pressure-bonding force is applied to the polycarbonate plates to thereby remove the polycarbonate plates with the pressure-sensitive adhesive composition. Glued. At this time, a part of the pressure-sensitive adhesive composition is taken out from between two polycarbonate plates. In this state, even if force was applied by hand to peel off one polycarbonate plate from the other polycarbonate plate, it could not be peeled off.
- the pressure-sensitive adhesive composition stretches and comes out between the two polycarbonate plates and breaks in the middle. Without being partly left on the polycarbonate plate, all the pressure-sensitive adhesive compositions were peeled while being integrated. As a result, the two polycarbonate plates could be easily separated.
- Example 2 As in Example 1, an adhesive solution having a solid content of 40 parts by weight was prepared.
- a diblock component 78% styrene / butadiene / styrene copolymer (D-1118 manufactured by Kraton) 40 parts by weight
- a diblock component 15% styrene / butadiene / styrene copolymer (TR2601 manufactured by JSR Corporation) 60 parts by weight.
- the diblock component of the styrene / butadiene / styrene copolymer is 40 parts by weight.
- Example 2 As in Example 1, an adhesive layer having a thickness of 100 ⁇ m was prepared.
- Example 2 As in Example 1, an adhesive solution having a solid content of 40 parts by weight was prepared.
- a diblock component of 78% styrene / butadiene / styrene copolymer (D-1118 manufactured by Kraton) 71 parts by weight, a diblock component 15% styrene / butadiene / styrene copolymer (TR2601 manufactured by JSR Corporation), 29 parts by weight.
- the diblock component of the styrene / butadiene / styrene copolymer is 60 parts by weight.
- Example 2 As in Example 1, an adhesive layer having a thickness of 100 ⁇ m was prepared.
- the tack was slightly reduced but it was usable.
- Example 2 As in Example 1, an adhesive solution having a solid content of 40 parts by weight was prepared.
- the tackifier was changed to 60 parts by weight of terpene phenol resin (YS Polystar T-115 manufactured by Yasuhara Chemical Co., Ltd.).
- Example 2 As in Example 1, an adhesive layer having a thickness of 100 ⁇ m was prepared.
- the tack was slightly reduced but it was usable.
- Example 2 As in Example 1, an adhesive solution having a solid content of 40 parts by weight was prepared.
- the styrene / butadiene / styrene copolymer was only 100 parts by weight of the diblock component 0% (TR2827 manufactured by JSR Corporation).
- Example 2 As in Example 1, an adhesive layer having a thickness of 100 ⁇ m was prepared.
- Example 2 As in Example 1, an adhesive solution having a solid content of 40 parts by weight was prepared.
- the styrene / butadiene / styrene copolymer was only 100 parts by weight of 78% diblock component (D-1118 manufactured by Kraton).
- Example 2 As in Example 1, an adhesive layer having a thickness of 100 ⁇ m was prepared.
- Example 2 As in Example 1, an adhesive solution having a solid content of 40 parts by weight was prepared.
- the tackifier was changed to 50 parts by weight of a special rosin ester (Arakawa Chemical Industries, Ltd., Super Ester A-115).
- Example 2 As in Example 1, an adhesive layer having a thickness of 100 ⁇ m was prepared.
- Example 2 As in Example 1, an adhesive solution having a solid content of 40 parts by weight was prepared.
- the tackifier was changed to 50 parts by weight of an aliphatic hydrocarbon resin (Tokoro Petrochemical Co., Ltd. Escollets 1304).
- An adhesive layer having a thickness of 100 ⁇ m was prepared in the same manner as in Example 1. Tack, holding power, and low-temperature characteristics were insufficient and could not be used.
- Example 2 As in Example 1, an adhesive solution having a solid content of 40 parts by weight was prepared.
- the tackifier was changed to 50 parts by weight of an alicyclic hydrocarbon resin (Arakawa Chemical Industries, Ltd., Alcon M115).
- Example 2 As in Example 1, an adhesive layer having a thickness of 100 ⁇ m was prepared.
- Example 2 As in Example 1, an adhesive solution having a solid content of 40 parts by weight was prepared.
- SIS SIS5200, manufactured by JSR Corporation.
- Example 2 As in Example 1, an adhesive layer having a thickness of 100 ⁇ m was prepared.
- Example 2 As in Example 1, an adhesive solution having a solid content of 40 parts by weight was prepared.
- Example 2 As in Example 1, an adhesive layer having a thickness of 100 ⁇ m was prepared.
- the 180 degree peeling adhesive strength at 100 ° C. was high, and the tensile strength was small and it was not usable.
- Example 2 As in Example 1, an adhesive solution having a solid content of 40 parts by weight was prepared.
- Example 2 As in Example 1, an adhesive layer having a thickness of 100 ⁇ m was prepared.
- the present invention can be used, for example, when bonding a panel of various electronic devices or electrical products and a housing.
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Abstract
Description
上記第1部材が有する意匠層に照射されたレーザー光の照射熱により加熱される粘着剤組成物であって、
上記粘着剤組成物の温度が25℃であるとき、ステンレス板からの180度引き剥がし粘着力が20N/25mm以上で、かつ、当該粘着剤組成物の破壊現象が界面剥離であり、
上記粘着剤組成物の温度が100℃であるとき、ステンレス板からの180度引き剥がし粘着力が10N/25mm以下で、かつ、当該粘着剤組成物の破壊現象が界面剥離であることを特徴とするものである。
上記粘着剤組成物によって形成した厚み100μmのダンベル状3号形による引っ張り強度が5MPa以上で、かつ、伸びが800%以上であることを特徴とするものである。
上記第1部材と上記第2部材とで挟まれて両部材に粘着した粘着剤組成物の一部に引っ張り力を加えた際に該粘着剤組成物が延伸して該部材から界面剥離することを特徴とする。
スチレン・ブタジェン・スチレン共重合物とテルペン系粘着付与剤を含むことを特徴とするものである。
テルペン系粘着付与剤の含有量は、スチレン・ブタジェン・スチレン共重合物の60重量部以下であることを特徴とするものである。
スチレン・ブタジェン・スチレン共重合物の中のジブロック成分が40重量部以上60重量部未満であることを特徴とするものである。
実施例1と同様に厚さ100μmの粘着層を作製した。
タック、保持力、低温特性とも不足しており使用できないレベルであった。
Claims (7)
- 透光性を有する第1部材と第2部材との間に配置され、
上記第1部材が有する意匠層に照射されたレーザー光の照射熱により加熱されて軟化する粘着剤組成物であって、
上記粘着剤組成物の温度が25℃であるとき、ステンレス板からの180度引き剥がし粘着力が20N/25mm以上で、かつ、当該粘着剤組成物の破壊現象が界面剥離であり、
上記粘着剤組成物の温度が100℃であるとき、ステンレス板からの180度引き剥がし粘着力が10N/25mm以下で、かつ、当該粘着剤組成物の破壊現象が界面剥離であることを特徴とする粘着剤組成物。 - 請求項1に記載の粘着剤組成物において、
上記粘着剤組成物によって形成した厚み100μmのダンベル状3号形による引っ張り強度が5MPa以上で、かつ、伸びが800%以上であることを特徴とする粘着剤組成物。 - 請求項1に記載の粘着剤組成物において、
上記第1部材と上記第2部材とで挟まれて両部材に粘着した粘着剤組成物の一部に引っ張り力を加えた際に該粘着剤組成物が延伸して該部材から界面剥離することを特徴とする粘着剤組成物。 - 請求項1に記載の粘着剤組成物において、
スチレン・ブタジェン・スチレン共重合物とテルペン系粘着付与剤を含むことを特徴とする粘着剤組成物。 - 請求項1に記載の粘着剤組成物において、
テルペン系粘着付与剤の含有量は、スチレン・ブタジェン・スチレン共重合物の60重量部以下であることを特徴とする粘着剤組成物。 - 請求項1に記載の粘着剤組成物において、
スチレン・ブタジェン・スチレン共重合物の中のジブロック成分が40重量部以上60重量部未満であることを特徴とする粘着剤組成物。 - 請求項1から請求項6のいずれか1つに記載されている粘着剤組成物を使用したことを特徴とするレーザー接合用粘着テープ。
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CN111286278A (zh) * | 2020-02-19 | 2020-06-16 | 闻泰通讯股份有限公司 | 一种柔性屏粘接方法及电子设备 |
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WO2017038307A1 (ja) * | 2015-08-31 | 2017-03-09 | 日東電工株式会社 | 粘着シート |
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