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WO2013035792A1 - Procédé de fabrication d'une feuille adhésive transparente pour des applications optiques, feuille adhésive transparente pour des applications optiques et dispositif d'affichage l'utilisant - Google Patents

Procédé de fabrication d'une feuille adhésive transparente pour des applications optiques, feuille adhésive transparente pour des applications optiques et dispositif d'affichage l'utilisant Download PDF

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Publication number
WO2013035792A1
WO2013035792A1 PCT/JP2012/072762 JP2012072762W WO2013035792A1 WO 2013035792 A1 WO2013035792 A1 WO 2013035792A1 JP 2012072762 W JP2012072762 W JP 2012072762W WO 2013035792 A1 WO2013035792 A1 WO 2013035792A1
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WIPO (PCT)
Prior art keywords
adhesive sheet
transparent adhesive
optical
treatment
producing
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Ceased
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PCT/JP2012/072762
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English (en)
Japanese (ja)
Inventor
洋介 小野
達也 布川
名塚　正範
股木　宏至
宣弘 笹澤
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Taica Corp
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Taica Corp
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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
    • C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
    • C09J5/02—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers involving pretreatment of the surfaces to be joined
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/10—Adhesives in the form of films or foils without carriers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/22—Plastics; Metallised plastics
    • 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
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
    • C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
    • 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
    • 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
    • C09J2483/00—Presence of polysiloxane

Definitions

  • the present invention relates to a method for producing an optical transparent adhesive sheet, an optical transparent adhesive sheet, and a display device using the same, and more specifically, a method for producing an optical transparent adhesive sheet capable of achieving both adhesion and reworkability, and optical transparency.
  • the present invention relates to an adhesive sheet and a display device using the same.
  • Patent Document 4 discloses a surface protective film comprising a base material layer and an adhesive layer, the adhesive layer comprising a copolymer of specific ethylene and ⁇ -olefin, and the surface of the adhesive layer having a corona discharge.
  • An activation treatment such as treatment or plasma treatment is performed, and from the viewpoint of adhesive strength, a surface protective film having a surface wetting index of 36 dyn / cm or more, preferably 40 dyn / cm or more is disclosed.
  • a surface protective film having a surface wetting index of 36 dyn / cm or more, preferably 40 dyn / cm or more is disclosed.
  • the adhesion improving effect and stability by the plasma treatment are different, and it is not always universal.
  • silicone adhesives that are attracting attention as optical materials due to their excellent transparency and heat resistance, the surface treatment effect is deactivated in a short time, so it is difficult to improve the adhesion by the surface activation treatment.
  • refer nonpatent literature 1. for silicone adhesives that are attracting attention as optical materials due to their excellent transparency and heat resistance.
  • Hydrophobic recovery (hydrophobic recovery) of this rapid hydrophobization is due to the fact that low molecular weight siloxane diffuses from the inside to the surface, and the methyl group component whose concentration has decreased due to the formation of hydrophilic groups on the surface is due to molecular motion.
  • the re-orientation is caused by coming out on the surface, etc., and usually returns to the original hydrophobic state within about 24 hours after the plasma treatment. For this reason, various attempts have been made to suppress the restoration of hydrophobicity and to maintain stable hydrophilicity, but at present, no fundamental solution has been reached.
  • the present applicant has also proposed a silicone-based pressure-sensitive adhesive sheet that has both reworkability and adhesion (see Patent Document 7), but in ensuring the adhesion that can pass the point pressure test described above.
  • Patent Document 7 a silicone-based pressure-sensitive adhesive sheet that has both reworkability and adhesion
  • there is still room for improvement In particular, with a low-hardness silicone gel, it is difficult to ensure adhesion, and technical hurdles for improving the adhesion are high.
  • An object of the present invention is to provide an optical transparent pressure-sensitive adhesive sheet that can achieve both adhesion and reworkability, and a method for producing the same, in view of the above-described problems of the prior art.
  • the inventors of the present invention are initially low-adhesiveness capable of reworking the adherend, and after sticking, as means for increasing the adhesive force over time.
  • (A) By applying a specific plasma treatment to the adhesive surface, it has an appropriate adhesive force when bonded to an adherend, and is excellent in workability (including reworkability).
  • the ability to produce a transparent adhesive sheet for silicone-based optics that increases the adhesiveness to the adherend and (B) the effect of increasing the adhesiveness to the adherend over time is the specific peelable surface By laminating a layer (in other words, an active sustaining layer), I found.
  • the present invention has been completed based on these findings.
  • a method for producing a transparent adhesive sheet for silicone-based optics for assembling optical components The surface of the pressure-sensitive adhesive surface that is in contact with the adherend of the optical transparent pressure-sensitive adhesive sheet is subjected to surface activation treatment, and the peel strength after bonding to the adherend is compared with the peel strength before bonding.
  • a method for producing an optical transparent pressure-sensitive adhesive sheet characterized by forming a surface activation-treated surface that increases with time.
  • the method for producing an optical transparent adhesive sheet according to the first aspect wherein the surface activation treatment is a corona discharge treatment or an atmospheric pressure plasma treatment.
  • the surface activation treatment is an atmospheric pressure plasma treatment, and the treatment is performed using a plasma derived from corona discharge.
  • a method for producing an adhesive sheet is provided.
  • the surface activation treatment is an atmospheric pressure plasma treatment, and the treatment is performed by an afterglow of plasma generated by corona discharge.
  • the peel strength (B) after 24 hours of bonding to the adherend is relative to the peel strength (A) at the initial stage of bonding.
  • the increase in peel strength (BA) is 1 N / 20 mm or more in a 90-degree peeling mode of an adhesive strength test according to JIS Z0237.
  • the method for producing an optical transparent pressure-sensitive adhesive sheet according to the first aspect further comprising laminating an activity maintaining layer on the surface activation treatment surface.
  • the activity maintaining layer is an alkyd resin-based or aliphatic amide-based release film.
  • a method is provided.
  • an optical transparent pressure-sensitive adhesive sheet obtained from the production method according to any one of the first to seventh aspects.
  • a protective panel, a polarizing plate, a phase difference, and a surface active treatment surface of the optical transparent adhesive sheet obtained from the manufacturing method according to any one of the first to fifth aspects are provided.
  • a method for producing a laminate comprising bonding an adherend comprising an optical component selected from a plate, a diffusion film, or a liquid crystal display device.
  • a laminate characterized in that it is obtained from the manufacturing method according to the ninth aspect.
  • an optical component using the optical transparent adhesive sheet or laminate according to the eighth or tenth aspect there is provided an optical transparent pressure-sensitive adhesive sheet manufacturing apparatus used in the method for manufacturing an optical transparent pressure-sensitive adhesive sheet according to any one of the first to seventh aspects of the invention. Is done.
  • the present invention relates to a method for producing a silicone-based transparent adhesive sheet for optical use for assembling optical components, and preferred embodiments thereof include the following.
  • the transparent adhesive sheet for silicone-based optics has an Asker C hardness of 0 to 30 according to SRIS 0101 standard, or a penetration according to JIS K2207 “Petroleum Asphalt” (25 A method for producing a transparent optical adhesive sheet, characterized by comprising a silicone gel having a temperature of 20 to 200 ° C.).
  • an apparatus for producing a transparent optical adhesive sheet comprising a surface activation treatment apparatus.
  • the obtained silicone-based optical transparent pressure-sensitive adhesive sheet for assembling optical components has an appropriate pressure-sensitive adhesive force when bonded to an adherend.
  • the productivity and cost of the combined work are improved, and after bonding, the adhesion with the adherend increases with time, so that problems such as peeling are prevented and stable quality can be realized.
  • the surface activation treatment effect such as plasma treatment effect, which has been considered difficult in the past, is maintained, and the peel strength increases over time. Therefore, it is excellent in storage property and can realize stable bonding.
  • the surface of the silicone-based cured body is subjected to surface activation treatment such as plasma treatment, thereby continuously producing an optical transparent adhesive sheet having improved adhesion (adhesiveness) to an adherend. Further, it has a remarkable effect that high adhesion (adhesiveness) can be stably obtained. Furthermore, the present invention can be applied not only to optical applications but also to silicone-based pressure-sensitive adhesive sheets that are not transparent, and can be used for a wider range of applications.
  • FIG. 1 is a schematic diagram for explaining a configuration example of the optically transparent adhesive sheet laminate of the present invention.
  • FIG. 2 is a schematic view of a method of processing by an afterglow of plasma generated by a corona discharge generated by an alternating electric field applied between two coaxial cylindrical electrodes.
  • FIG. 3 is a schematic view for explaining the method for producing the optical transparent adhesive sheet of the present invention.
  • FIG. 4 is a schematic diagram for explaining another embodiment of the method for producing an optical transparent adhesive sheet of the present invention.
  • FIG. 5 is a schematic diagram for explaining another embodiment of the method for producing the optical transparent pressure-sensitive adhesive sheet of the present invention.
  • FIG. 6 is a graph showing the relationship between the peel strength and the irradiation distance in the examples of the method for producing the optical transparent adhesive sheet of the present invention.
  • FIG. 7 is a graph showing the relationship between peel strength and processing output in an example of the method for producing an optical transparent adhesive sheet of the present invention.
  • FIG. 8 is a graph showing the change over time of the increase in peel strength with respect to the pasting time after pasting to the adherend in the example of the method for producing the optical transparent adhesive sheet of the present invention.
  • FIG. 9 is a graph showing the change over time in the amount of increase in peel strength with respect to the pasting time for the case of coating with the surface activity maintaining layer in the example of the method for producing the optical transparent adhesive sheet of the present invention.
  • FIG. 10 is a graph showing the relationship between the storage elapsed time in the state covered with the surface activity maintaining layer and the peel strength from the adherend after storage in the example of the method for producing the transparent optical adhesive sheet of the present invention. It is.
  • FIG. 11 is a schematic diagram illustrating the configuration and test mode of a sample for a peel force test.
  • the method for producing a silicone-based optical transparent adhesive sheet for assembling an optical component according to the present invention comprises subjecting at least a part of or the entire adhesive surface in contact with the adherend of the optical transparent adhesive sheet to surface activation treatment, It is a method for producing a transparent adhesive sheet for optics, characterized in that the surface activation treatment surface is formed such that the peel strength after bonding to an adherend increases with time compared to the peel strength before bonding. .
  • the method for producing a silicone-based transparent optical adhesive sheet for assembling an optical component according to the present invention is characterized in that an active maintenance layer is further laminated on the surface activation-treated surface. It is a manufacturing method of the transparent adhesive sheet for optics to do.
  • each item will be described.
  • the optically transparent pressure-sensitive adhesive sheet according to the present invention has, as a pressure-sensitive adhesive, a transparent silicone gel, acrylic gel, polyolefin gel, polyurethane gel, butadiene gel, isoprene gel, A transparent adhesive composed of at least one transparent gel selected from butyl gel, styrene butadiene gel, ethylene vinyl acetate copolymer gel, ethylene-propylene-diene terpolymer gel or fluorine gel is used. Is preferred.
  • silicone type gel what is formed from the addition reaction type silicone gel which has adhesiveness is preferable.
  • the hardness of the silicone-based gel the Asker C hardness of SRIS 0101 standard is preferably 0 to 30, or the penetration (25 ° C.) according to JIS K2207 “Petroleum Asphalt” is preferably 20 to 200.
  • the term “transparent” means colorless transparent, colored transparent, and translucent.
  • the transparent silicone gel used in the present invention has a total light transmittance (JIS) of visible light having a wavelength of 380 to 780 nm.
  • JIS total light transmittance
  • K7105 “Testing method for optical properties of plastic”) is preferably 80% or more, more preferably 85% or more, and particularly preferably 90% or more.
  • the transmittance is an index of the transparency of the transparent member. When the transmittance is less than 80%, for example, light emitted from the screen is difficult to transmit through the transparent member, and thus visibility is deteriorated.
  • the transmittance is a value measured using a spectrophotometer or the like.
  • the group bonded to the silicon atom is not particularly limited, for example, an alkyl group such as a methyl group, an ethyl group, or a propyl group, a cycloalkyl group such as a cyclopentyl group or a cyclohexyl group, a vinyl group, an allyl group, or the like.
  • aryl groups such as alkenyl groups, phenyl groups, and tolyl groups, those in which the hydrogen atoms of these groups are partially substituted with other atoms or bonding groups.
  • silicone gel material trade name: CF-5106 (penetration 150) manufactured by Toray Dow Corning Co., Ltd. is preferable, and this silicone gel material is a silicone as a raw material.
  • the resin is divided into A liquid and B liquid. By mixing and heating both liquids at a predetermined ratio, a silicone gel material having a desired penetration can be obtained.
  • the production method of the addition reaction type (or cross-linked) silicone gel used in the present invention is not particularly limited. Usually, however, an organohydrodiene polysiloxane and an alkenyl polysiloxane, which will be described later, are used as raw materials, and both are hydrolyzed in the presence of a catalyst. It can be obtained by a silylation reaction (addition reaction).
  • the silicone gel has adhesiveness derived from the non-crosslinked functional group on the surface.
  • the silicone gel is formulated with an MQ resin-type tackifier component, the addition of a non-reactive adhesive component, the non-crosslinked functional group What applied the well-known tackiness imparting methods, such as expressing the adhesiveness by adjusting the length of a side chain, the kind of terminal functional group, etc. can also be used.
  • the manufacturing method of the optical transparent adhesive sheet of this invention is characterized by further laminating an activity maintenance layer on the surface activation treatment surface.
  • an activity maintenance layer By laminating the activity maintaining layer on the surface activation treatment surface, it is possible to suppress a decrease in the surface activation treatment effect.
  • the mechanism is unknown at present.
  • the activity maintaining layer is required to be peelable from the surface activation treatment surface in addition to being laminated on the surface activation treatment surface to suppress a decrease in the surface activation treatment effect. Therefore, since the activity maintaining layer also functions as a release film (also referred to as a release liner), a known release film can be used as the activity maintaining layer.
  • release films include polyethersulfone resins, cellulose acetate resins, polyimide resins, polyester resins, polyether resins, epoxy resins, phenol resins, polyamide resins, polyolefin (eg polypropylene), and other organic resins; these organic resins Is a film formed by laminating with another peelable organic resin, or a film in which these organic resins cover the surface of a peelable substrate film.
  • the film is used as an activity maintaining layer. Since the release film is peeled and removed when laminated on the adherend, an alkyd resin release film and an aliphatic amide release film that are excellent in peelability are preferable.
  • the method for manufacturing an optical transparent pressure-sensitive adhesive sheet according to the present invention comprises subjecting at least a part or the entire surface of the pressure-sensitive adhesive surface in contact with the adherend to a surface activation treatment.
  • the surface activation treatment surface is formed such that the peel strength after bonding to the adherend increases with time as compared to the peel strength before bonding.
  • the method for producing an optical transparent pressure-sensitive adhesive sheet of the present invention is characterized in that surface activation treatment is performed on at least a part or the entire surface of the pressure-sensitive adhesive surface in contact with the adherend of the optical transparent pressure-sensitive adhesive sheet.
  • the surface activation treatment it is possible to form a surface activation treatment surface in which the peel strength after bonding to the adherend increases with time compared to the peel strength before bonding.
  • the surface activation treatment is a known method such as corona discharge treatment (in air, nitrogen, carbon dioxide, etc.), plasma treatment (high pressure, low pressure), alkali metal solution treatment, high-frequency sputtering etching treatment. Chemical surface treatment methods such as these are preferable, and corona discharge treatment or plasma treatment is preferred, plasma treatment is more preferred, and atmospheric pressure plasma treatment is even more preferred.
  • atmospheric pressure plasma treatment is roughly classified into, for example, thermal equilibrium plasma typified by arc discharge and non-thermal equilibrium plasma typified by corona discharge and dielectric barrier discharge.
  • Atmospheric pressure plasma is preferred.
  • Corona discharge that generates atmospheric pressure plasma is known to take various discharge modes depending on the type of atmospheric gas, voltage application method (direct current, alternating current, pulse) and the magnitude of the applied voltage.
  • a method of treating with a plasma afterglow generated by a corona discharge generated by an alternating electric field applied between two coaxial cylindrical electrodes can be adopted. (See FIG. 2) is more preferable.
  • the plasma afterglow treatment is performed in an environment where the plasma energy is low as compared with the plasma treatment method (plasma treatment) in which the plasma is directly treated, the effects of the present invention are exhibited.
  • a plasma energy environment as low as the afterglow of the plasma is effective.
  • a method of treating with a plasma afterglow generated by a corona discharge generated by an alternating electric field applied between the two coaxial cylindrical electrodes is not constant at present.
  • the treatment conditions and the like will be specifically exemplified by taking the surface treatment of the silicone adhesive as an example.
  • Type of gas examples include nitrogen, oxygen, hydrogen, carbon dioxide, etc.
  • the effect varies depending on the gas type.
  • the time-dependent change width of the adhesive force after pasting can be adjusted.
  • the time-varying width contributes to reworkability and adhesion after lamination to the adherend, and the larger the width, the more advantageous.
  • the above gas species is, for example, an adhesive when PMMA is used as an adherend.
  • the magnitude of the force UP effect is in the order of O 2 > H 2 > CO 2
  • the magnitude of the temporal change width is O 2 > H 2 ⁇ CO 2 .
  • the active maintenance layer is required to have low adhesion (high peelability).
  • the gas type The dependence of is small.
  • oxygen gas is preferable from the viewpoint of the balance between the improvement of adhesiveness and the light release property of the release film.
  • the effect of gas concentration is small compared to the effect of gas type.
  • Plasma irradiation conditions As plasma irradiation conditions, irradiation distance and output are typical factor conditions. When processing is performed by a plasma afterglow generated by a corona discharge generated by an alternating electric field applied between two coaxial cylindrical electrodes, the irradiation distance has a peak in adhesive strength in a small region regardless of the gas type. Specifically, the adhesive force changes when the irradiation distance is in the range of 5 to 20 mm, and has a peak near the center of the range. Further, the output tends to increase the adhesive force as the output increases, but the contribution to the adhesive force is small compared to the irradiation distance.
  • the surface once activated may be further treated with a different surface activation treatment method and / or different surface activation treatment conditions (for example, different gas types).
  • a different surface activation treatment method and / or different surface activation treatment conditions for example, different gas types.
  • the mechanism (mechanism) for improving the adhesive force of the pressure-sensitive adhesive layer different from the conventional one by surface activation treatment such as corona discharge treatment or plasma treatment and its maintenance is not clear at present, As a result of the roughening of the surface of the pressure-sensitive adhesive layer by the activation treatment, the pressure-sensitive adhesive easily enters the slits on the surface of the adherend, and the pressure-sensitive adhesive that has penetrated into the slits lowers the wrinkles.
  • a composite effect is that the anchoring effect that exhibits strong adhesive force occurs, or that the adhesive force is improved by the occurrence of carbonyl groups, carboxyl groups, etc. on the adhesive surface and the surface being polarized. Is considered.
  • the above-mentioned activity maintaining layer on the surface activation treatment surface.
  • the silicone gel treatment surface is covered with a release film (sheet-like or roll-like), rework is possible. Adhesive strength is maintained, and after bonding to the adherend, the adhesive strength improves over time, and the adhesion is ensured.
  • the manufacturing method of the optical transparent adhesive sheet of this invention consists of the formation process and surface activation processing process of the optical transparent adhesive sheet which carry out surface activation processing, and surface activation processing process Is a step of performing a surface activation treatment on a portion that is desired to be surface activated by a surface treatment apparatus, while a known method can be applied to the step of forming the optical transparent adhesive sheet.
  • surface activation processing process Is a step of performing a surface activation treatment on a portion that is desired to be surface activated by a surface treatment apparatus, while a known method can be applied to the step of forming the optical transparent adhesive sheet.
  • FIG. 3 is a schematic diagram of a continuous optical transparent adhesive sheet manufacturing apparatus.
  • an uncured pressure-sensitive adhesive composition is applied to a predetermined thickness on a release film, and the optically transparent pressure-sensitive adhesive sheet discharged from the curing zone is cured by curing in the curing zone while leaving the coated surface open.
  • the surface is surface activated with a surface activation processing apparatus, and then a release film to be an activity maintaining layer is laminated to obtain an optical transparent adhesive sheet having the configuration of FIG. .
  • an uncured pressure-sensitive adhesive composition is applied to a predetermined thickness on a release film that has been subjected to a release treatment on both sides, and the application surface is left open as it is in a curing zone.
  • the surface of the transparent adhesive sheet for optics discharged from the curing zone is activated by a surface activation treatment device, and the surface of the transparent adhesive sheet for optics discharged from the curing zone is activated.
  • a surface activation treatment device the surface of the transparent adhesive sheet for optics discharged from the curing zone is activated.
  • the transparent adhesive sheet for optics before the surface activation process formed by the method of FIG. 3 and FIG. Since it can be set in advance before the re-treatment, it is useful because the degree of freedom in designing the front-back different adhesion can be expanded without relying only on the surface activation treatment for the front-back different adhesion required for the peeling selectivity at the time of rework. Also in the method of FIG. 5, by adjusting the type of base material surface to be brought into contact with both surfaces of the uncured pressure-sensitive adhesive composition to a different kind of combination, the same adjustment of front and back different tackiness as in FIGS. 3 and 4 can be achieved. Is possible.
  • optical transparent adhesive sheet obtained by the method for producing the optical transparent adhesive sheet of the present invention is applied to the adherend on at least a part of or the entire adhesive surface in contact with the adherend.
  • the peel strength after pasting has a surface activation treatment surface that increases with time, so it has moderate adhesive strength when pasting to the adherend. Therefore, productivity and cost of bonding work are improved, and after bonding, adhesiveness with the adherend increases with time, so troubles such as peeling are prevented and stable quality is realized. it can. That is, the optical transparent pressure-sensitive adhesive sheet of the present invention can achieve both adhesion and reworkability.
  • the adhesion may increase over time depending on the temperature, compatibility with the adherend, etc., but the present invention significantly accelerates the increase in adhesion over time due to the surface activation treatment.
  • the amount of increase in adhesion over time can be adjusted according to the surface activation treatment conditions.
  • the surface activation treatment surface of the optical transparent pressure-sensitive adhesive sheet of the present invention is an increase in peel strength (B) after 24 hours with respect to the peel strength (A) at the initial adhesion when bonded to an adherend ( B-A) is characterized in that it is 1 N / 20 mm or more in the 90-degree peeling mode of the adhesive strength test according to JIS Z0237.
  • attachment initial stage is 20 minutes after surface activation process (including the bonding operation
  • optical transparent pressure-sensitive adhesive sheet laminate production method thereof
  • the optical transparent pressure-sensitive adhesive sheet laminate of the present invention is obtained by closely laminating optical components on the surface activation-treated surface of the optical transparent pressure-sensitive adhesive sheet,
  • a protective panel, a polarizing plate, a retardation plate, a diffusion film, a liquid crystal display device, a light guide plate, a touch panel element, a planar light emitting device, and the like can be applied depending on applications and purposes.
  • a display device unit Used as a touch panel unit, lighting unit, or a component thereof.
  • optical components are laminated on both sides.
  • the optical transparent adhesive sheet laminate may be laminated to an optical component on the optical transparent adhesive sheet immediately after the surface activation treatment, or using an optical transparent adhesive sheet in which an activity maintaining layer is laminated, You may laminate on the surface activation treatment surface which peeled.
  • lamination stacking of the transparent adhesive sheet for optics and an optical component will not be specifically limited if it can be bonded so that a bubble may not be caught, A roller bonding method, a vacuum bonding method, etc. are applicable. If the transparent adhesive sheet for optics is bonded to an optical component within a certain period of time, it can be re-attached (reworked). A transparent adhesive sheet laminate for optics is obtained in which the transparent adhesive sheet and the optical component are firmly adhered in a state where no peeling or bubbles are generated in the point pressure test.
  • optical transparent adhesive sheet laminate was produced by the following procedure. (I) Supplying an uncured liquid viscoelastic material onto the release film (B) and setting the thickness; (ii) Opening and heating curing without attaching the release film (A) after molding And (iii) forming a transparent adhesive sheet for optics through a cooling step for cooling the cured sheet obtained in the heat curing step, and (iv) on the surface cured by heating in the heating step.
  • a release film attachment step of attaching a release film (A) as an active maintenance layer to the surface activation treatment surface An optical transparent adhesive sheet laminate having a penetration of 100 and a hardness of 200 mm ⁇ 200 mm ⁇ thickness 0.5 mm was obtained, in which the release film (A), the optical transparent adhesive body, and the release film (B) were laminated in this order.
  • the uncured liquid silicone gel raw material is a two-component addition reaction type silicone gel (model: SLJ3363, total light transmittance in air of 90%) manufactured by Asahi Kasei Wacker Silicone Co., Ltd., liquid A (main agent + crosslinking catalyst) / Liquid B (main agent + crosslinking agent) blended at 55 parts by weight / 45 parts by weight was used.
  • the release film (A) is an alkyd resin release film (model: T-9, film thickness: 0.1 mm) manufactured by Panac Co., Ltd., and the release film (B) is fluorosilicone manufactured by Unitika Ltd.
  • a system release film (model: FZ, film thickness: 0.1 mm) was used.
  • the thickness setting in the molding step (i) is carried out by placing the release film (B) on the flat glass substrate with the release action surface facing upward, and further, aluminum on the release film (B). Place a frame-shaped spacer with an inner dimension of 200 mm ⁇ 200 mm ⁇ thickness 0.5 mm and pour the uncured silicone gel raw material into the mold, and then squeeze it along the upper surface of the mold with a squeegee plate. The method was performed by removing the cured silicone gel raw material. The curing of (ii) was performed by heating and curing in a hot air oven at 75 ° C. for 1 hour, and the cooling of (iii) was naturally cooled on a wooden board at room temperature (25 ° C.).
  • the surface activation treatment of (iv) is performed by an atmospheric pressure plasma apparatus (ULD manufactured by AcXys Technologies, ULD) that performs treatment with a plasma after glow generated by a corona discharge generated by an alternating electric field applied between two coaxial cylindrical electrodes. -120) was carried out at a transfer speed of 4 m / min under the conditions of gas type, irradiation distance, and output shown in Table 1.
  • ULD atmospheric pressure plasma apparatus
  • Peel strength The 90-degree peeling adhesive strength in an adhesive strength test in accordance with JIS Z0237 “Testing method for adhesive tape / adhesive sheet” was measured with a 90-degree peel tester at a pulling speed of 300 mm / min.
  • the test sample for evaluation was obtained by bonding the adherend to the surface activation-treated surface of the optical transparent adhesive sheet with the release film (B) prepared in each Example and Comparative Example, and then the release film (B).
  • a resin film (PET, emblet made by Unitika Co., Ltd.) is pasted on the surface from which the release film (B) is peeled, via a primer (Primer A made by Shin-Etsu Chemical Co., Ltd.)
  • a test sample for evaluation of peel strength was produced with the configuration schematically shown in FIGS. 11 (a) and 11 (b), and the test was performed.
  • the pasting condition was one round trip at a speed of 300 mm / min with a 2 kg roller, and then left at 23 ° C. for 20 to 40 minutes.
  • the adherend was an acrylic plate (Mitsubishi Rayon Co., Ltd., MR-200) having a thickness of 1 mm and a glass plate (Hiraoka Glass Co., Ltd., soda glass).
  • Table 2 shows the results of comparative evaluation of the optical transparent adhesive sheets of Examples 1 and 13 and the optical transparent adhesive sheet of Comparative Example 1 with respect to the adhesiveness with time after bonding, which is a feature of the present invention. Furthermore, about the relationship between the increase amount (difference) of the peeling strength with respect to the peeling strength at the initial stage of bonding in Table 2 and the pasting elapsed time, it is applied to a PMMA plate, a glass plate, and a release film (active maintenance layer) The combined cases are shown in FIGS. 8 (a), 8 (b) and 9, respectively. In FIGS. 8A and 8B, the black plots and the bold underline notation in Table 2 indicate that the optical transparent adhesive sheet has been destroyed. From the result of FIG.
  • the optical transparent adhesive sheet of Example 13 in which the glass plate was used as an adherend, the optical transparent adhesive sheet of Example 13 was subjected to no surface activation treatment as shown in FIG. Compared with the optical transparent adhesive sheet of Comparative Example 1, it can be seen that the adhesiveness over time is promoted. In addition, in the case of the transparent adhesive sheet for optics of Example 1, it is the adhesiveness of the state which destroys a material from the initial stage of bonding, and measurement of peeling strength with time is impossible (only the material breaking strength of the transparent adhesive sheet for optics is measured) It was because it was not possible. Furthermore, although not described in FIG. 8 (a), FIG.
  • optical transparent adhesive sheets of Examples 1 and 13 were able to be peeled off from the PMMA and glass as adherends. In this way, there is a difference in the behavior of adhesiveness over time depending on the type of adherend and surface treatment result treatment conditions, but in any case, the adhesion over time is promoted by the surface activation treatment, and bonding It can be seen that rework is possible within the range of pasting time that can be peeled later. Furthermore, it can be seen that by adjusting the surface treatment result processing conditions, it is possible to adjust the adhesiveness over time according to the type of adherend and the desired rework time.
  • the surface activated surface is coated with the release film (A) that is the active maintenance layer, and the optically transparent adhesive laminate that has been stored is peeled and removed from the time and the release film (A) that has been coated and stored with the active maintenance layer.
  • Table 3 shows the relationship between the peel strength and the adherend (PMMA and glass). Further, in Table 3, the relationship between the storage elapsed time and the change in peel strength when the adherend is PMMA is shown in FIG.
  • the amount of change in Table 3 is a value obtained by subtracting the peel strength at the storage elapsed time of 0 hr from the peel strength at each storage elapsed time. Moreover, the bold underline notation in Table 3 represents that the optical transparent adhesive sheet was destroyed. From this result, the peel strength from the adherend hardly changes with the time of coating and storing with the active maintenance layer, and the surface activation treatment effect is maintained by coating (lamination) with the active maintenance layer. You can see that
  • the optical transparent adhesive sheet obtained by the method for producing an optical transparent adhesive sheet of the present invention can achieve both adhesion and reworkability, a display device such as a mobile phone, a liquid crystal monitor, and a liquid crystal television, indoors or It can be used for outdoor signs, advertisements, lighting signs for posting, lighting fixtures, tail lamps, vehicle optical parts such as interior lighting, and the like. Moreover, it can be applied not only to optical applications but also to silicone-based pressure-sensitive adhesive sheets that are not transparent, and can be used for a wider range of applications.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Adhesive Tapes (AREA)
  • Laminated Bodies (AREA)
  • Polarising Elements (AREA)

Abstract

L'invention a pour but de proposer une feuille adhésive transparente pour des applications optiques, qui est apte à avoir un bon équilibre entre le caractère adhésif et une aptitude aisée à la séparation, compte tenu des problèmes mentionnés ci-dessus de l'état de la technique ; et un procédé de fabrication de la feuille adhésive transparente pour des applications optiques. A cet effet, l'invention concerne un procédé de fabrication d'une feuille adhésive transparente à base de silicone pour des applications optiques, spécifiquement pour l'assemblage d'éléments optiques, qui est caractérisé par le fait qu'au moins une partie ou la totalité d'une surface adhésive de la feuille adhésive transparente pour des applications optiques, ladite surface adhésive devant être en contact avec un objet auquel la feuille adhésive transparente pour des applications optiques est liée, est soumise à un traitement d'activation de surface tel qu'un traitement de décharge corona ou un traitement par plasma à pression atmosphérique de façon à former une surface activée dans laquelle la résistance au pelage après liaison à l'objet est accrue au cours du temps par comparaison avec la résistance de pelage avant la liaison ; et une feuille adhésive transparente pour des applications optiques, qui est obtenue par le procédé de fabrication.
PCT/JP2012/072762 2011-09-09 2012-09-06 Procédé de fabrication d'une feuille adhésive transparente pour des applications optiques, feuille adhésive transparente pour des applications optiques et dispositif d'affichage l'utilisant Ceased WO2013035792A1 (fr)

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JP2015158552A (ja) * 2014-02-24 2015-09-03 信越ポリマー株式会社 表示パネル用部材及び表示パネル用部材の製造方法
JP2015193739A (ja) * 2014-03-31 2015-11-05 積水化成品工業株式会社 光学フィルム
CN105579076A (zh) * 2013-09-24 2016-05-11 左迪阿克涂料 用于医疗用途的粘合材料的生产方法
JP2016153455A (ja) * 2015-02-20 2016-08-25 住友化学株式会社 樹脂フィルム付光学部材の製造方法
JP2017120313A (ja) * 2015-12-28 2017-07-06 住友化学株式会社 樹脂フィルム付光学部材の製造方法
CN108713049A (zh) * 2016-03-02 2018-10-26 德莎欧洲股份公司 通过选择性等离子体预处理增加剥离力
WO2019235562A1 (fr) * 2018-06-08 2019-12-12 日立化成株式会社 Procédé de fabrication d'une feuille adhésive, procédé de fabrication d'un ruban de découpage en puces/fixage de puces, procédé de fabrication d'un dispositif à semi-conducteur, procédé de traitement d'un adhésif, procédé d'immobilisation d'une partie adhérée et procédé de décollage d'une partie adhérée
TWI900880B (zh) 2018-06-08 2025-10-11 日商力森諾科股份有限公司 切晶-黏晶一體型帶的製造方法、及半導體裝置的製造方法

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JP2002363527A (ja) * 2001-06-11 2002-12-18 Konishi Co Ltd 経時硬化型粘接着剤組成物
JP2004196991A (ja) * 2002-12-19 2004-07-15 Shin Etsu Polymer Co Ltd 光学表示体用透明シリコーン粘着部材及び透明積層体
JP2009086452A (ja) * 2007-10-01 2009-04-23 Nitto Denko Corp 粘着型光学フィルムの製造方法、粘着型光学フィルムおよび画像表示装置
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JP2015158552A (ja) * 2014-02-24 2015-09-03 信越ポリマー株式会社 表示パネル用部材及び表示パネル用部材の製造方法
JP2015193739A (ja) * 2014-03-31 2015-11-05 積水化成品工業株式会社 光学フィルム
CN105907316B (zh) * 2015-02-20 2021-08-10 住友化学株式会社 带树脂膜的光学部件的制造方法
JP2016153455A (ja) * 2015-02-20 2016-08-25 住友化学株式会社 樹脂フィルム付光学部材の製造方法
KR20160102341A (ko) * 2015-02-20 2016-08-30 스미또모 가가꾸 가부시키가이샤 수지 필름 부착 광학 부재의 제조 방법
CN105907316A (zh) * 2015-02-20 2016-08-31 住友化学株式会社 带树脂膜的光学部件的制造方法
KR102565137B1 (ko) * 2015-02-20 2023-08-08 스미또모 가가꾸 가부시키가이샤 수지 필름 부착 광학 부재의 제조 방법
JP2017120313A (ja) * 2015-12-28 2017-07-06 住友化学株式会社 樹脂フィルム付光学部材の製造方法
CN108713049A (zh) * 2016-03-02 2018-10-26 德莎欧洲股份公司 通过选择性等离子体预处理增加剥离力
JP2019512033A (ja) * 2016-03-02 2019-05-09 テーザ・ソシエタス・ヨーロピア 選択的プラズマ前処理による剥離力の増加
CN112272691A (zh) * 2018-06-08 2021-01-26 昭和电工材料株式会社 压敏胶片的制造方法、切晶粘晶一体型带的制造方法、半导体装置的制造方法、压敏胶黏剂的处理方法、被粘附体的固定化方法及被粘附体的剥离方法
JPWO2019235562A1 (ja) * 2018-06-08 2021-06-24 昭和電工マテリアルズ株式会社 粘着シートの製造方法、ダイシング・ダイボンディング一体型テープの製造方法、半導体装置の製造方法、粘着剤の処理方法、被着体の固定化方法、及び被着体の剥離方法
KR20210020042A (ko) * 2018-06-08 2021-02-23 쇼와덴코머티리얼즈가부시끼가이샤 점착 시트의 제조 방법, 다이싱·다이본딩 일체형 테이프의 제조 방법, 반도체 장치의 제조 방법, 점착제의 처리 방법, 피착체의 고정화 방법, 및 피착체의 박리 방법
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JP7283472B2 (ja) 2018-06-08 2023-05-30 株式会社レゾナック 粘着シートの製造方法、ダイシング・ダイボンディング一体型テープの製造方法、半導体装置の製造方法、粘着剤の処理方法、被着体の固定化方法、及び被着体の剥離方法
WO2019235562A1 (fr) * 2018-06-08 2019-12-12 日立化成株式会社 Procédé de fabrication d'une feuille adhésive, procédé de fabrication d'un ruban de découpage en puces/fixage de puces, procédé de fabrication d'un dispositif à semi-conducteur, procédé de traitement d'un adhésif, procédé d'immobilisation d'une partie adhérée et procédé de décollage d'une partie adhérée
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