WO2016063405A1 - 粘着剤、粘着シートおよび表示体 - Google Patents
粘着剤、粘着シートおよび表示体 Download PDFInfo
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- WO2016063405A1 WO2016063405A1 PCT/JP2014/078270 JP2014078270W WO2016063405A1 WO 2016063405 A1 WO2016063405 A1 WO 2016063405A1 JP 2014078270 W JP2014078270 W JP 2014078270W WO 2016063405 A1 WO2016063405 A1 WO 2016063405A1
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- pressure
- sensitive adhesive
- meth
- adhesive layer
- active energy
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/10—Adhesives in the form of films or foils without carriers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
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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
- C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
- C09J4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09J159/00 - C09J187/00
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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
-
- 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
- C09J7/40—Adhesives in the form of films or foils characterised by release liners
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
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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
Definitions
- the present invention relates to a pressure-sensitive adhesive and a pressure-sensitive adhesive sheet for bonding display-body constituent members, and a display body obtained by using a pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet.
- Various mobile electronic devices such as mobile phones and tablet terminals in recent years include a display body (display) using a display body module having a liquid crystal element, a light emitting diode (LED element), an organic electroluminescence (organic EL) element, and the like. Yes.
- a protective panel is usually provided on the surface side of the display module.
- a gap is provided between the protection panel and the display module so that the deformed protection panel does not hit the display module even when the protection panel is deformed by an external force.
- a frame-like printed layer may exist as a step on the display module side of the protective panel. If the pressure-sensitive adhesive layer does not follow the step, the pressure-sensitive adhesive layer floats in the vicinity of the step, thereby causing light reflection loss. For this reason, the pressure-sensitive adhesive layer is required to have a step following ability.
- Patent Document 1 discloses that the shear storage elastic modulus (G ′) at 25 ° C. and 1 Hz is 1.0 as an adhesive layer that fills the gap between the protective panel and the display module.
- ⁇ is at 10 5 Pa or less
- a gel fraction discloses a pressure-sensitive adhesive layer is 40% or more.
- Patent Document 1 an attempt is made to improve the step following property by lowering the storage elastic modulus at normal temperature in the pressure-sensitive adhesive layer.
- the storage elastic modulus and the gel fraction are lowered as described above, the coating strength of the pressure-sensitive adhesive layer is lowered, and the workability is deteriorated. For example, when the pressure sensitive adhesive sheet is punched out, a problem arises in that the pressure sensitive adhesive adheres to the blade and a part of the pressure sensitive adhesive layer is lost.
- the present invention has been made in view of such a situation, and provides a pressure-sensitive adhesive and a pressure-sensitive adhesive sheet that are excellent in step followability and exhibit high film strength, and a display body obtained using the pressure-sensitive adhesive sheet. For the purpose.
- the present invention is a pressure-sensitive adhesive for bonding one display member constituting member having a step on at least the surface to be bonded and another display member constituting member.
- the pressure-sensitive adhesive comprises a (meth) acrylic acid ester polymer (A) containing a reactive functional group-containing monomer as a monomer unit constituting the polymer, and a bifunctional or higher active energy ray-curable component (B ) And a thermally crosslinkable crosslinking agent (C) are thermally crosslinked and active energy ray cured, and the active energy ray curable component (B) in the adhesive composition
- the gel fraction of the pressure-sensitive adhesive obtained by thermally crosslinking the pressure-sensitive adhesive composition obtained by removing the active energy ray-curable component (B) from the pressure-sensitive adhesive composition.
- the rate (G2) is an amount that is substantially the same.
- the pressure-sensitive adhesive layer has a thickness of 600 ⁇ m and a width of 10 mm, the maximum stress when stretched to the breaking elongation at a measurement length of 20 mm and a tensile speed of 200 mm / min in an environment of 23 ° C. and 50% RH is Provided is a pressure-sensitive adhesive characterized by being 2.8 N or more (Invention 1).
- the pressure-sensitive adhesive according to the above invention (Invention 1) satisfies the above-described conditions, thereby being excellent in step following ability and exhibiting high film strength.
- the gel fraction (G1) is preferably 40 to 80% (Invention 2).
- the (meth) acrylic acid ester polymer (A) preferably has a weight average molecular weight of 200,000 to 1,000,000 (Invention 4).
- the (meth) acrylic acid ester polymer (A) may contain 5 to 30% by mass of the reactive functional group-containing monomer as a monomer unit constituting the polymer. Preferred (Invention 5).
- the reactive functional group of the reactive functional group-containing monomer is a carboxyl group and / or a hydroxyl group
- the crosslinking agent (C) is an isocyanate-based crosslinking agent and / or an epoxy.
- a cross-linking agent is preferable (Invention 6).
- the present invention provides a pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer composed of the pressure-sensitive adhesive (Inventions 1 to 6) (Invention 7).
- the thickness of the pressure-sensitive adhesive layer is preferably 10 to 400 ⁇ m (Invention 8).
- the pressure-sensitive adhesive sheet includes two release sheets, and the pressure-sensitive adhesive layer is sandwiched between the release sheets so as to be in contact with the release surfaces of the two release sheets.
- this invention is the one display body structural member which has a level
- the step may have a frame shape in plan view (Invention 11).
- the pressure-sensitive adhesive according to the present invention and the pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet are excellent in step following ability and exhibit high film strength.
- the adhesive layer follows the step, and even after the endurance condition, the step and the adhesive It is difficult to form voids or bubbles between them, and the pressure-sensitive adhesive layer can maintain a state where the step is filled.
- the pressure-sensitive adhesive according to the present embodiment is a pressure-sensitive adhesive for bonding at least one display member constituting member having a step on the surface to be bonded and another display member forming member.
- a display body and a display body structural member are mentioned later.
- the pressure-sensitive adhesive includes a (meth) acrylic acid ester polymer (A) containing a reactive functional group-containing monomer as a monomer unit constituting the polymer, and a bifunctional or higher functional energy ray-curable component (B). ) And a heat-crosslinkable crosslinking agent (C) (hereinafter, sometimes referred to as “adhesive composition P”) are thermally crosslinked and active energy ray cured.
- the (meth) acrylic acid ester polymer (A) is crosslinked by a crosslinking agent (C) to form a three-dimensional network structure, and the active energy ray-curable components (B) are polymerized with each other.
- (meth) acrylic acid means both acrylic acid and methacrylic acid.
- (meth) acrylic acid means both acrylic acid and methacrylic acid.
- polymer includes the concept of “copolymer”.
- the content of the active energy ray-curable component (B) in the adhesive composition P includes the gel fraction (G1) of the adhesive according to the present embodiment and the active energy ray-curable component from the adhesive composition P.
- the gel fraction (G2) of the pressure-sensitive adhesive obtained by thermally crosslinking the pressure-sensitive adhesive composition excluding (B) (hereinafter sometimes referred to as “pressure-sensitive adhesive H”) is an amount that is substantially the same. .
- substantially the same means that the gel fraction change rate shown below is at a level of 15% or less.
- the gel fraction change rate is obtained by thermally crosslinking a pressure-sensitive adhesive composition obtained by removing the active energy ray-curable component (B) from the pressure-sensitive adhesive composition P by G1 (%).
- G2 (%) When the gel fraction of the pressure-sensitive adhesive H is expressed as G2 (%), it is represented by the following formula.
- Gel fraction change rate (%) ⁇ (G1-G2) / G2 ⁇ ⁇ 100
- the pressure-sensitive adhesive according to this embodiment preferably has a gel fraction change rate of 0 to 15%, particularly preferably 0 to 10%, and more preferably 0 to 4%.
- the measuring method of a gel fraction is as showing to the test example mentioned later.
- the adhesive according to the present embodiment has a breaking elongation at a measurement length of 20 mm and a tensile speed of 200 mm / min in an environment of 23 ° C. and 50% RH when the adhesive layer has a thickness of 600 ⁇ m and a width of 10 mm. It is necessary that the maximum stress when it is extended to 2.8 N or more. Thereby, the film intensity
- the upper limit of the maximum stress is not particularly limited, but is preferably 7N or less, and particularly preferably 6N or less from the viewpoint of not deteriorating the step following rate.
- the specific method of this tensile test is as showing to the test example mentioned later. Such maximum stress is achieved when the adhesive composition P contains a predetermined amount of the active energy ray-curable component (B).
- the (meth) acrylic acid ester polymer is obtained by thermally crosslinking and curing the active energy ray of the pressure-sensitive adhesive composition P containing the active energy ray-curable component (B) in the above amount. It is presumed that the three-dimensional network structure formed by (A) and the crosslinking agent (C) forms a structure X in which the polymerized active energy ray-curable component (B) is entangled to such an extent that the gel fraction is not substantially changed. The With this structure X, the pressure-sensitive adhesive according to the present embodiment exhibits excellent stress relaxation properties and excellent step-following properties.
- the adhesive according to the present embodiment satisfactorily follows the steps when bonding one display body constituent member having a step on the surface to be pasted and another display body constituent member.
- a predetermined durability condition it is difficult to form a gap or a bubble between the step and the pressure-sensitive adhesive, and the pressure-sensitive adhesive layer can maintain a state in which the level difference is filled (hereinafter, after the predetermined durability condition).
- the step following ability may be simply referred to as “step following ability”.
- the pressure-sensitive adhesive according to the present embodiment exhibits high film strength. Therefore, for example, when the pressure-sensitive adhesive sheet is punched out, it is possible to suppress the occurrence of problems such as adhesion of the pressure-sensitive adhesive to the blade and a lack of a part of the pressure-sensitive adhesive layer.
- the (meth) acrylic acid ester polymer (A) contains a reactive functional group-containing monomer as a monomer unit constituting the polymer.
- the reactive functional group derived from the reactive functional group-containing monomer reacts with the crosslinking agent (C) to form a crosslinked structure.
- the reactive functional group-containing monomer contained in the (meth) acrylic acid ester polymer (A) as a monomer unit constituting the polymer includes a monomer having a hydroxyl group in the molecule (hydroxyl group-containing monomer) and a carboxyl in the molecule.
- Preferred examples include a monomer having a group (carboxyl group-containing monomer) and a monomer having an amino group in the molecule (amino group-containing monomer).
- a hydroxyl group-containing monomer and a carboxyl group-containing monomer excellent in reactivity with an isocyanate-based crosslinking agent or an epoxy-based crosslinking agent are preferable.
- hydroxyl group-containing monomer examples include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, (meth And (meth) acrylic acid hydroxyalkyl esters such as 3-hydroxybutyl acrylate and 4-hydroxybutyl (meth) acrylate.
- 2-hydroxyethyl (meth) acrylate is preferred from the viewpoint of the reactivity of the resulting (meth) acrylic acid ester polymer (A) with the crosslinking agent (C) of the hydroxyl group and the copolymerizability with other monomers.
- 4-hydroxybutyl (meth) acrylate is preferable. These may be used alone or in combination of two or more.
- carboxyl group-containing monomer examples include ethylenically unsaturated carboxylic acids such as acrylic acid, methacrylic acid, crotonic acid, maleic acid, itaconic acid, and citraconic acid.
- carboxylic acids such as acrylic acid, methacrylic acid, crotonic acid, maleic acid, itaconic acid, and citraconic acid.
- acrylic acid is preferred from the viewpoint of the reactivity of the resulting (meth) acrylic acid ester polymer (A) with the crosslinking agent (C) of the carboxyl group and the copolymerizability with other monomers.
- acrylic acid is preferred from the viewpoint of the reactivity of the resulting (meth) acrylic acid ester polymer (A) with the crosslinking agent (C) of the carboxyl group and the copolymerizability with other monomers.
- amino group-containing monomer examples include aminoethyl (meth) acrylate, n-butylaminoethyl (meth) acrylate, and the like. These may be used alone or in combination of two or more.
- the (meth) acrylic acid ester polymer (A) preferably contains 5 to 30% by mass of a reactive functional group-containing monomer as a monomer unit constituting the polymer, particularly 7 to 25% by mass.
- the content is preferably 10 to 20% by mass.
- the content of the reactive functional group-containing monomer is 5% by mass or more, a crosslinking point can be secured and the structure X can be favorably formed.
- desired adhesiveness is easy to be acquired as content of a reactive functional group containing monomer is 30 mass% or less.
- the (meth) acrylic acid ester polymer (A) contains a hydroxyl group-containing monomer as a reactive functional group-containing monomer constituting the polymer
- its content is preferably 10 to 25% by mass, In particular, the content is preferably 15 to 20% by mass.
- the content thereof is 8 to 25% by mass. It is particularly preferable that the content is 10 to 15% by mass.
- the (meth) acrylic acid ester polymer (A) preferably contains a (meth) acrylic acid alkyl ester having an alkyl group having 1 to 20 carbon atoms as a monomer unit constituting the polymer.
- the obtained adhesive can express preferable adhesiveness.
- the below-mentioned hard monomer is removed from the (meth) acrylic acid alkyl ester.
- alkyl ester having 1 to 20 carbon atoms in the alkyl group examples include methyl acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, n-butyl (meth) acrylate, ( N-pentyl (meth) acrylate, n-hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate, n-decyl (meth) acrylate, n-dodecyl (meth) acrylate , Myristyl (meth) acrylate, palmityl (meth) acrylate, stearyl (meth) acrylate, and the like.
- (meth) acrylic acid esters having an alkyl group having 1 to 8 carbon atoms are preferable, and n-butyl (meth) acrylate and 2-ethylhexyl (meth) acrylate are particularly preferable. . These may be used alone or in combination of two or more.
- the (meth) acrylic acid ester polymer (A) contains 40 to 95% by mass of (meth) acrylic acid alkyl ester having an alkyl group having 1 to 20 carbon atoms as a monomer unit constituting the polymer.
- the content is preferably 50 to 93% by mass, more preferably 55 to 90% by mass.
- the (meth) acrylic acid ester polymer (A) may contain a hard monomer having a glass transition temperature (Tg) of 70 ° C. or more as a homopolymer as a monomer unit constituting the polymer. preferable.
- Tg glass transition temperature
- a homopolymer having a low glass transition temperature (Tg) such as 2-ethylhexyl (meth) acrylate (for example, Tg is preferably ⁇ 30)
- Tg glass transition temperature
- the main component is one having a temperature of °C or less, particularly preferably -60 ° C or less, it is preferable to use the hard monomer because the cohesion tends to be low.
- the glass transition temperature (Tg) of the hard monomer as a homopolymer is preferably 75 to 200 ° C., particularly preferably 80 to 180 ° C.
- Examples of the hard monomer include methyl methacrylate (Tg 105 ° C.), isobornyl acrylate (Tg 94 ° C.), isobornyl methacrylate (Tg 180 ° C.), acryloylmorpholine (Tg 145 ° C.), adamantyl acrylate (Tg 115 ° C.), and adamantyl methacrylate. (Tg 141 ° C.), dimethylacrylamide (Tg 89 ° C.), acrylamide (Tg 165 ° C.) and the like. These may be used alone or in combination of two or more.
- methyl methacrylate, isobornyl acrylate and acryloyl morpholine are more preferable from the viewpoint of exerting the performance of the hard monomer while preventing adverse effects on other properties such as adhesiveness and transparency, and follow the step. From the viewpoint of further reducing the decrease in properties, isobornyl acrylate and acryloylmorpholine are particularly preferable.
- the (meth) acrylic acid ester polymer (A) preferably contains 10 to 45% by mass, and particularly preferably 15 to 30% by mass of the hard monomer as a monomer unit constituting the polymer.
- the hard monomer in an amount of 10% by mass or more, an effect of improving blister resistance by the monomer unit can be expected.
- the hard monomer content is set to 45% by mass or less, the relative shortage of other monomer units in the (meth) acrylic acid ester polymer (A) is prevented, and the pressure-sensitive adhesive obtained The adhesiveness and the step following ability can be made excellent.
- the (meth) acrylic acid ester polymer (A) may contain other monomers as a monomer unit constituting the polymer, if desired.
- the other monomer is preferably a monomer that does not contain a reactive functional group so as not to interfere with the action of the reactive functional group-containing monomer.
- Such other monomers include, for example, (meth) acrylic acid alkoxyalkyl esters such as methoxyethyl (meth) acrylate and ethoxyethyl (meth) acrylate, and aliphatic rings such as cyclohexyl (meth) acrylate (meta ) Acrylic acid ester, (meth) acrylic acid N, N-dimethylaminoethyl, (meth) acrylic acid N, N-dimethylaminopropyl, etc. (meth) acrylic acid ester having acetic acid tertiary amino group, acetic acid Examples include vinyl and styrene. These may be used alone or in combination of two or more.
- the polymerization mode of the (meth) acrylic acid ester polymer (A) may be a random copolymer or a block copolymer.
- the weight average molecular weight of the (meth) acrylic acid ester polymer (A) is preferably 200,000 to 1,000,000, particularly preferably 300,000 to 900,000, and more preferably 400,000 to 700,000. .
- the weight average molecular weight in this specification is the value of standard polystyrene conversion measured by the gel permeation chromatography (GPC) method.
- the weight average molecular weight of the (meth) acrylic acid ester polymer (A) is within a relatively low range as described above, a pressure sensitive adhesive having better step following ability can be obtained. If the weight average molecular weight of the (meth) acrylic acid ester polymer (A) exceeds 1,000,000, the step following ability may be inferior. On the other hand, when the weight average molecular weight of the (meth) acrylic acid ester polymer (A) is less than 200,000, the pressure-sensitive adhesive may be inferior in durability.
- the (meth) acrylic acid ester polymer (A) may be used alone or in combination of two or more.
- the active energy ray-curable component (B) is not particularly limited as long as it is a component that is cured by irradiation with active energy rays without impeding the effects of the present invention, and may be any of a monomer, an oligomer, or a polymer. Or a mixture thereof. Among them, a polyfunctional acrylate monomer having a molecular weight of less than 1000 that is excellent in compatibility with the (meth) acrylic acid ester polymer (A) and the like can be preferably exemplified.
- Examples of the polyfunctional acrylate monomer having a molecular weight of less than 1000 include 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, and polyethylene glycol diester.
- an active energy ray-curable acrylate oligomer can also be used.
- the acrylate oligomer preferably has a weight average molecular weight of 50,000 or less.
- examples of such acrylate oligomers include polyester acrylate, epoxy acrylate, urethane acrylate, polyether acrylate, polybutadiene acrylate, and silicone acrylate.
- the weight average molecular weight of the acrylate oligomer is preferably 50,000 or less, particularly preferably 500 to 50,000, and more preferably 3,000 to 40,000. These acrylate oligomers may be used alone or in combination of two or more.
- an adduct acrylate polymer in which a group having a (meth) acryloyl group is introduced into the side chain can also be used.
- Such an adduct acrylate-based polymer uses a copolymer of (meth) acrylic acid ester and a monomer having a crosslinkable functional group in the molecule, and a part of the crosslinkable functional group of the copolymer.
- a (meth) acryloyl group and a compound having a group that reacts with a crosslinkable functional group can be reacted.
- the weight average molecular weight of the adduct acrylate polymer is preferably about 50,000 to 900,000, and more preferably about 100,000 to 500,000.
- the active energy ray-curable component (B) can be used by selecting one from among the above-mentioned polyfunctional acrylate monomers, acrylate oligomers and adduct acrylate polymers, or a combination of two or more. It can also be used in combination with other active energy ray-curable components.
- the content of the active energy ray-curable component (B) in the adhesive composition P is as described above. Specifically, from the viewpoint of obtaining appropriate film strength, a (meth) acrylic acid ester polymer is used. (A) It is preferable that it is 0.1 mass part or more with respect to 100 mass parts, It is especially preferable that it is 0.5 mass part or more, Furthermore, it is preferable that it is 1 mass part or more.
- the gel fraction (G1) of the pressure-sensitive adhesive according to the present embodiment and the pressure-sensitive adhesive H obtained by thermally crosslinking the pressure-sensitive adhesive composition obtained by removing the active energy ray-curable component (B) from the pressure-sensitive adhesive composition P.
- the content of the active energy ray-curable component (B) is (meth) acrylic acid ester polymer (A) 100. It is preferably 4 parts by mass or less, more preferably 3 parts by mass or less, particularly preferably 2.5 parts by mass or less, and less than 2.0 parts by mass with respect to parts by mass. Most preferred.
- the pressure-sensitive adhesive composition P contains a heat-crosslinkable cross-linking agent (C), and crosslinks the (meth) acrylic acid ester polymer (A) by heating to form a three-dimensional network structure. It improves the cohesive strength of the agent and imparts durability to the pressure-sensitive adhesive.
- crosslinking agent (C) what is necessary is just to react with the reactive functional group which (meth) acrylic acid ester polymer (A) has, for example, isocyanate type crosslinking agent, epoxy type crosslinking agent, amine type crosslinking Agent, melamine-based crosslinking agent, aziridine-based crosslinking agent, hydrazine-based crosslinking agent, aldehyde-based crosslinking agent, oxazoline-based crosslinking agent, metal alkoxide-based crosslinking agent, metal chelate-based crosslinking agent, metal salt-based crosslinking agent, ammonium salt-based crosslinking agent Etc.
- isocyanate type crosslinking agent epoxy type crosslinking agent
- amine type crosslinking Agent melamine-based crosslinking agent
- aziridine-based crosslinking agent hydrazine-based crosslinking agent
- aldehyde-based crosslinking agent aldehyde-based crosslinking agent
- the reactive functional group of the (meth) acrylic acid ester polymer (A) is a hydroxyl group
- an isocyanate-based crosslinking agent that is excellent in reactivity with the hydroxyl group
- (meth) acrylic acid when the reactive functional group which the ester polymer (A) has is a carboxyl group, it is preferable to use an epoxy-based crosslinking agent having excellent reactivity with the carboxyl group.
- a crosslinking agent (C) can be used individually by 1 type or in combination of 2 or more types.
- the isocyanate-based crosslinking agent contains at least a polyisocyanate compound.
- the polyisocyanate compound include aromatic polyisocyanates such as tolylene diisocyanate, diphenylmethane diisocyanate and xylylene diisocyanate, aliphatic polyisocyanates such as hexamethylene diisocyanate, alicyclic polyisocyanates such as isophorone diisocyanate and hydrogenated diphenylmethane diisocyanate, and the like.
- biuret bodies, isocyanurate bodies, and adduct bodies that are a reaction product with low molecular active hydrogen-containing compounds such as ethylene glycol, propylene glycol, neopentyl glycol, trimethylolpropane, and castor oil.
- low molecular active hydrogen-containing compounds such as ethylene glycol, propylene glycol, neopentyl glycol, trimethylolpropane, and castor oil.
- trimethylolpropane-modified aromatic polyisocyanate particularly trimethylolpropane-modified tolylene diisocyanate and trimethylolpropane-modified xylylene diisocyanate are preferable from the viewpoint of reactivity with hydroxyl groups.
- epoxy-based crosslinking agent examples include 1,3-bis (N, N′-diglycidylaminomethyl) cyclohexane, N, N, N ′, N′-tetraglycidyl-m-xylylenediamine, ethylene glycol diglycidyl.
- examples include ether, 1,6-hexanediol diglycidyl ether, trimethylolpropane diglycidyl ether, diglycidyl aniline, diglycidyl amine and the like.
- the content of the crosslinking agent (C) in the pressure-sensitive adhesive composition P is preferably 0.001 to 2 parts by mass, particularly 0 to 100 parts by mass of the (meth) acrylic acid ester polymer (A).
- the amount is preferably 0.01 to 1 part by mass, more preferably 0.02 to 0.3 part by mass.
- the content of the cross-linking agent (C) is 0.001 part by mass or more, a durability improving effect can be imparted to the obtained pressure-sensitive adhesive.
- the content of the cross-linking agent (C) is 2 parts by mass or less, the degree of cross-linking can be made moderate, and the step following property of the obtained pressure-sensitive adhesive can be ensured satisfactorily.
- additives usually used in acrylic adhesives such as silane coupling agents, photopolymerization initiators, antistatic agents, tackifiers, Antioxidants, ultraviolet absorbers, light stabilizers, softeners, fillers, refractive index adjusters, and the like can be added.
- the silane coupling agent is preferably an organosilicon compound having at least one alkoxysilyl group in the molecule and having good compatibility with the (meth) acrylic acid ester polymer (A). Moreover, when an adhesive is an optical use, the silane coupling agent which has a light transmittance is suitable.
- silane coupling agents include polymerizable unsaturated group-containing silicon compounds such as vinyltrimethoxysilane, vinyltriethoxysilane, and methacryloxypropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 2- ( 3,4-epoxycyclohexyl) silicon compounds having an epoxy structure such as ethyltrimethoxysilane, mercapto group-containing silicon compounds such as 3-mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, and 3-mercaptopropyldimethoxymethylsilane Amino group-containing compounds such as 3-aminopropyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane, etc.
- silicon compounds such as
- the addition amount of the silane coupling agent is preferably 0.01 to 1.0 part by weight, particularly 0.05 to 0.5 part by weight, based on 100 parts by weight of the (meth) acrylic acid ester polymer (A). Part.
- the adhesive composition P when ultraviolet rays are used as the active energy ray irradiated to the adhesive composition P, the adhesive composition P preferably further contains a photopolymerization initiator.
- the active energy ray-curable component (B) can be efficiently cured, and the polymerization curing time and the amount of active energy ray irradiation can be reduced.
- photopolymerization initiator examples include benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin-n-butyl ether, benzoin isobutyl ether, acetophenone, dimethylaminoacetophenone, 2,2-dimethoxy-2- Phenylacetophenone, 2,2-diethoxy-2-phenylacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- [4- (methylthio) Phenyl] -2-morpholino-propan-1-one, 4- (2-hydroxyethoxy) phenyl-2- (hydroxy-2-propyl) ketone, benzophenone, p-phenylbenzophenone, 4,4′- Ethylaminobenzophenone, dichlorobenzophenone, 2-methylanthraquinone, 2-e
- the photopolymerization initiator is preferably used in an amount of 2 to 15 parts by mass, particularly 4 to 12 parts by mass with respect to 100 parts by mass of the active energy ray-curable component (B).
- the adhesive composition P manufactured the (meth) acrylic acid ester polymer (A), the obtained (meth) acrylic acid ester polymer (A), and an active energy ray. While mixing a sclerosing
- the (meth) acrylic acid ester polymer (A) can be produced by polymerizing a mixture of monomers constituting the polymer by an ordinary radical polymerization method.
- the polymerization of the (meth) acrylic acid ester polymer (A) can be performed by a solution polymerization method or the like using a polymerization initiator as desired.
- the polymerization solvent include ethyl acetate, n-butyl acetate, isobutyl acetate, toluene, acetone, hexane, methyl ethyl ketone and the like, and two or more kinds may be used in combination.
- Examples of the polymerization initiator include azo compounds and organic peroxides, and two or more kinds may be used in combination.
- Examples of the azo compound include 2,2′-azobisisobutyronitrile, 2,2′-azobis (2-methylbutyronitrile), 1,1′-azobis (cyclohexane 1-carbonitrile), 2 2,2'-azobis (2,4-dimethylvaleronitrile), 2,2'-azobis (2,4-dimethyl-4-methoxyvaleronitrile), dimethyl 2,2'-azobis (2-methylpropionate) 4,4′-azobis (4-cyanovaleric acid), 2,2′-azobis (2-hydroxymethylpropionitrile), 2,2′-azobis [2- (2-imidazolin-2-yl) Propane] and the like.
- organic peroxides examples include benzoyl peroxide, t-butyl perbenzoate, cumene hydroperoxide, diisopropyl peroxydicarbonate, di-n-propyl peroxydicarbonate, and di (2-ethoxyethyl) peroxy.
- organic peroxides include benzoyl peroxide, t-butyl perbenzoate, cumene hydroperoxide, diisopropyl peroxydicarbonate, di-n-propyl peroxydicarbonate, and di (2-ethoxyethyl) peroxy.
- examples thereof include dicarbonate, t-butyl peroxyneodecanoate, t-butyl peroxybivalate, (3,5,5-trimethylhexanoyl) peroxide, dipropionyl peroxide, diacetyl peroxide and the like.
- the weight average molecular weight of the resulting polymer can be adjusted by adding a chain transfer agent such as 2-mercaptoethanol.
- the solution of the (meth) acrylic acid ester polymer (A) is added to the active energy ray-curable component (B), the crosslinking agent (C), and, if desired.
- An adhesive composition P is obtained by adding an additive and mixing well.
- the thermal crosslinking of the adhesive composition P can be performed by a heat treatment.
- This heat treatment can also serve as a drying treatment after the application of the adhesive composition P.
- the heating temperature of the heat treatment is preferably 50 to 150 ° C., particularly preferably 70 to 120 ° C.
- the heating time is preferably 10 seconds to 10 minutes, particularly preferably 50 seconds to 2 minutes.
- the active energy ray means an electromagnetic wave or a charged particle beam having an energy quantum, and specifically includes ultraviolet rays, electron beams, and the like.
- ultraviolet rays that are easy to handle are particularly preferable.
- Irradiation with ultraviolet rays can be performed by a high-pressure mercury lamp, a fusion H lamp, a xenon lamp, or the like, and the irradiation amount of ultraviolet rays is preferably about 50 to 1000 mW / cm 2 in illuminance. Further, the light amount is preferably 50 ⁇ 10000mJ / cm 2, more preferably 80 ⁇ 5000mJ / cm 2, and particularly preferably 200 ⁇ 2000mJ / cm 2.
- the electron beam irradiation can be performed by an electron beam accelerator or the like, and the electron beam irradiation amount is preferably about 10 to 1000 krad.
- the (meth) acrylate polymer (A) reacts with the crosslinking agent (C) to form a crosslinked structure, that is, a three-dimensional network structure.
- an active energy ray is irradiated with respect to the adhesive composition P, an active energy ray hardening component (B) will superpose
- the pressure-sensitive adhesive according to this embodiment obtained in this manner is excellent in step following ability and exhibits high film strength.
- the adhesive which concerns on this embodiment, after performing a heat processing, you may perform an active energy ray irradiation and may perform both processes simultaneously. It is also preferable to provide a curing period of about 1 to 2 weeks at normal temperature (for example, 23 ° C., 50% RH) after heat treatment or irradiation with active energy rays.
- the gel fraction (G1) of the pressure-sensitive adhesive according to this embodiment is preferably 40 to 80%, particularly preferably 45 to 70%, and more preferably 50 to 65%. Preferably there is.
- the gel fraction (G1) is 40% or more, the coating strength of the pressure-sensitive adhesive can be ensured satisfactorily. Further, when the gel fraction (G1) is 80% or less, the step following performance of the pressure-sensitive adhesive can be ensured satisfactorily.
- the pressure-sensitive adhesive according to this embodiment has a measurement length of 20 mm and a tensile speed of 200 mm / min in an environment of 23 ° C. and 50% RH when the pressure-sensitive adhesive layer has a thickness of 600 ⁇ m and a width of 10 mm.
- the elongation at break when stretched at is preferably 1000% or more, particularly preferably 1100 to 4000%, and more preferably 1200 to 2500%.
- the specific method of this tensile test is as showing to the test example mentioned later.
- the pressure-sensitive adhesive according to the present embodiment can achieve the above-described elongation at break by thermal crosslinking and active energy ray curing of the above-described pressure-sensitive adhesive composition P.
- the pressure-sensitive adhesive is more excellent in step following ability.
- step difference tracking rate is as showing to the test example mentioned later.
- the pressure-sensitive adhesive according to the present embodiment can achieve a large step following rate as described above by thermal crosslinking and active energy ray curing of the above-described pressure-sensitive adhesive composition P.
- the pressure-sensitive adhesive sheet 1 As shown in FIG. 1, the pressure-sensitive adhesive sheet 1 according to this embodiment includes two release sheets 12a and 12b and the two release sheets 12a so as to be in contact with the release surfaces of the two release sheets 12a and 12b. , 12b and an adhesive layer 11 sandwiched between the two layers.
- the release surface of the release sheet in this specification refers to a surface having peelability in the release sheet, and includes both a surface that has been subjected to a release treatment and a surface that exhibits peelability without being subjected to a release treatment. .
- the pressure-sensitive adhesive layer 11 in the pressure-sensitive adhesive sheet 1 is composed of the above-described pressure-sensitive adhesive, that is, a pressure-sensitive adhesive formed by thermal crosslinking and active energy ray curing of the pressure-sensitive adhesive composition P.
- the thickness of the pressure-sensitive adhesive layer 11 is preferably 10 to 1000 ⁇ m, more preferably 30 to 400 ⁇ m, and particularly preferably 50 to 300 ⁇ m.
- the pressure-sensitive adhesive layer 11 may be formed as a single layer or may be formed by laminating a plurality of layers.
- the thickness of the pressure-sensitive adhesive layer 11 is less than 10 ⁇ m, sufficient step followability may not be obtained. On the other hand, workability will become favorable in the thickness of the adhesive layer 11 being 1000 micrometers or less.
- release sheet examples of the release sheets 12a and 12b include polyethylene film, polypropylene film, polybutene film, polybutadiene film, polymethylpentene film, polyvinyl chloride film, vinyl chloride copolymer film, polyethylene terephthalate film, polyethylene naphthalate. Phthalate film, polybutylene terephthalate film, polyurethane film, ethylene vinyl acetate film, ionomer resin film, ethylene / (meth) acrylic acid copolymer film, ethylene / (meth) acrylic acid ester copolymer film, polystyrene film, polycarbonate film A polyimide film, a fluororesin film, or the like is used. These crosslinked films are also used. Furthermore, these laminated films may be sufficient.
- the release surface of the release sheets 12a and 12b (particularly the surface in contact with the pressure-sensitive adhesive layer 11) is preferably subjected to a release treatment.
- the release agent used for the release treatment include alkyd, silicone, fluorine, unsaturated polyester, polyolefin, and wax release agents.
- one release sheet is preferably a heavy release release sheet having a high release force
- the other release sheet is preferably a light release release sheet having a low release force.
- the thickness of the release sheets 12a and 12b is not particularly limited, but is usually about 20 to 150 ⁇ m.
- the coating liquid of the said adhesive composition P is apply
- the adhesive layer P is formed by performing heat treatment on the coating layer to thermally crosslink the adhesive composition P and irradiating active energy rays to cure the adhesive composition P.
- the release surface of the other release sheet 12b (or 12a) is superimposed on the pressure-sensitive adhesive layer 11 formed as described above, and this is used as the pressure-sensitive adhesive sheet 1.
- the pressure-sensitive adhesive composition P is prepared by applying a coating liquid of the pressure-sensitive adhesive composition P to the release surface of one release sheet 12 a and subjecting the coating layer to heat treatment. Are thermally crosslinked and irradiated with active energy rays to cure the pressure-sensitive adhesive composition P to form a first pressure-sensitive adhesive layer.
- the adhesive liquid P is applied to the release surface of the other release sheet 12b, and the adhesive layer P is thermally cross-linked by applying heat treatment to the coating layer. Is applied to cure the pressure-sensitive adhesive composition P to form a second pressure-sensitive adhesive layer.
- the peeling sheet 12a with the 1st adhesive layer and the peeling sheet 12b with the 2nd adhesive layer are bonded together so that both adhesive layers may mutually contact, and let this be the adhesive sheet 1.
- FIG. instead of obtaining the pressure-sensitive adhesive sheet 1 after forming the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer individually, the respective application layers are brought into contact with each other at the stage of thermal crosslinking, and then summarized.
- the adhesive sheet 1 may be obtained by irradiating active energy rays.
- a method of applying the coating liquid of the above-mentioned adhesive composition P for example, a bar coating method, a knife coating method, a roll coating method, a blade coating method, a die coating method, a gravure coating method, or the like can be used.
- the heat treatment conditions for the applied adhesive composition P are as described above.
- the pressure-sensitive adhesive layer 11 is excellent in level-step following property, even when the pressure-sensitive adhesive layer 11 is applied to a display member having a level difference and then exposed to predetermined durability conditions, the level difference and the pressure-sensitive adhesive layer 11 are present. It is difficult for voids or bubbles to be formed between them, and the pressure-sensitive adhesive layer 11 can fill the steps. Further, since the pressure-sensitive adhesive layer 11 has high film strength, for example, when the pressure-sensitive adhesive sheet 1 is punched, there is a problem that the pressure-sensitive adhesive adheres to the blade and a part of the pressure-sensitive adhesive layer 11 is lost. Is suppressed.
- the pressure-sensitive adhesive layer 11 in the present embodiment preferably has a haze value (measured according to JIS K7136: 2000) of 3% or less, particularly preferably 2% or less. Further, it is preferably 1% or less. When the haze value is 3% or less, the transparency is very high, which is suitable for optical applications.
- the adhesive sheet 1 in the present embodiment has an adhesive strength (measured according to JIS Z0237: 2009) of 5 N / 25 mm or more in order to exhibit excellent step following ability even after durability conditions. It is preferably 10N / 25mm or more, particularly preferably 25N / 25mm or more. Moreover, from the viewpoint of imparting reworkability to the pressure-sensitive adhesive sheet 1, the pressure-sensitive adhesive force is preferably 50 N / 25 mm or less, more preferably 40 N / 25 mm or less, and particularly preferably 35 N / 25 mm or less. . The details of the adhesive strength test method are as described in the test examples.
- the display body 2 includes a first display body constituent member 21 (one display body constituent member) having a step on at least a surface to be bonded, and a second display body.
- the display body constituent member 22 other display body constituent member
- the first display body constituting member 21 has a step on the surface on the pressure-sensitive adhesive layer 11 side, and specifically has a step due to the printing layer 3. .
- Examples of the display body 2 include a liquid crystal (LCD) display, a light emitting diode (LED) display, an organic electroluminescence (organic EL) display, electronic paper, and the like, and may be a touch panel.
- LCD liquid crystal
- LED light emitting diode
- organic EL organic electroluminescence
- the first display member constituting member 21 is preferably a protective plate made of a laminated body including a glass plate, a plastic plate, or the like.
- the printing layer 3 is generally formed in a frame shape on the pressure-sensitive adhesive layer 11 side in the first display member constituting member 21.
- the second display member constituting member 22 includes a display module (for example, a liquid crystal (LCD) module, a light emitting diode (LED) module, an organic electroluminescence (organic EL) module, etc.) or a part thereof (for example, a polarizing plate).
- a display module for example, a liquid crystal (LCD) module, a light emitting diode (LED) module, an organic electroluminescence (organic EL) module, etc.
- a part thereof for example, a polarizing plate.
- An optical member is preferable.
- the glass plate is not particularly limited. For example, chemically tempered glass, alkali-free glass, quartz glass, soda lime glass, barium / strontium-containing glass, aluminosilicate glass, lead glass, borosilicate glass, barium borosilicate Glass etc. are mentioned.
- the thickness of the glass plate is not particularly limited, but is usually 0.1 to 5 mm, preferably 0.2 to 2 mm.
- the plastic plate is not particularly limited, and examples thereof include an acrylic plate and a polycarbonate plate.
- the thickness of the plastic plate is not particularly limited, but is usually 0.2 to 5 mm, preferably 0.4 to 3 mm.
- Various functional layers may be provided on one or both surfaces of the glass plate or plastic plate, or an optical member. May be laminated. Moreover, the transparent conductive film and the metal layer may be patterned.
- optical member examples include a polarizing plate (polarizing film), a polarizer, a retardation plate (retarding film), a viewing angle compensation film, a brightness enhancement film, a contrast enhancement film, a liquid crystal polymer film, a diffusion film, and a hard coat film. And a semi-transmissive reflective film.
- the material constituting the printing layer 3 is not particularly limited, and a known material for printing is used.
- the thickness of the printing layer 3, that is, the height of the step, is preferably 3 to 45 ⁇ m, particularly preferably 5 to 35 ⁇ m, more preferably 7 to 25 ⁇ m, and 7 to 15 ⁇ m. Is most preferred.
- the adhesive sheet 1 is cut into a size corresponding to the first display body constituent member 21 and the second display body constituent member 22.
- the entire thickness direction of the pressure-sensitive adhesive sheet 1 may be cut, or the other release sheet 12b of the pressure-sensitive adhesive sheet 1 may not be cut, and the pressure-sensitive adhesive layer 11 and the one release sheet 12a may be half-cut.
- the coating strength of the pressure-sensitive adhesive layer 11 is high, it is suppressed that the pressure-sensitive adhesive adheres to the blade and a part of the pressure-sensitive adhesive layer 11 is lost.
- one release sheet 12a of the pressure-sensitive adhesive sheet 1 is peeled off, and the pressure-sensitive adhesive layer 11 exposed from the pressure-sensitive adhesive sheet 1 is bonded to the surface of the first display member constituting member 21 on the side where the printed layer 3 exists.
- the other peeling sheet 12b is peeled from the pressure-sensitive adhesive layer 11 of the pressure-sensitive adhesive sheet 1, and the pressure-sensitive adhesive layer 11 exposed from the pressure-sensitive adhesive sheet 1 and the second display member constituting member 22 are bonded together.
- the pressure-sensitive adhesive layer 11 When the pressure-sensitive adhesive layer 11 and the first display member constituting member 21 are bonded together in the above process, the pressure-sensitive adhesive layer 11 is excellent in level-step following capability, so that the level difference between the printed layer 3 and the pressure-sensitive adhesive layer even after a predetermined durability condition. It is difficult to form a gap between the pressure-sensitive adhesive layer 11 and the pressure-sensitive adhesive layer 11 can fill the step.
- the first display member constituting member 21 may have a step other than the printing layer 3 or may not have a step.
- the 2nd display body structural member 22 may also have a level
- Example 1 Preparation of (meth) acrylic acid ester polymer 90 parts by weight of n-butyl acrylate and 10 parts by weight of acrylic acid were copolymerized to prepare a (meth) acrylic acid ester polymer (A). When the molecular weight of this (meth) acrylic acid ester polymer (A) was measured by the method described later, it was a weight average molecular weight (Mw) of 400,000.
- the product name “Irgacure 184” manufactured by the company is added at a mass equivalent to 10% by mass of the component (B), sufficiently stirred, and diluted with methyl ethyl ketone to give an adhesive composition having a solid content concentration of 37% by mass. A coating solution of the product was obtained.
- Table 1 shows the composition of the adhesive composition. Details of the abbreviations and the like described in Table 1 are as follows.
- [(Meth) acrylic acid ester polymer] BA: n-butyl acrylate AA: acrylic acid 2EHA: 2-ethylhexyl acrylate MMA: methyl methacrylate HEA: 2-hydroxyethyl acrylate IBXA: isobornyl acrylate
- ACMO acryloylmorpholine
- VAc vinyl acetate
- M-315 Tris (acryloxyethyl) isocyanurate (manufactured by Toa Gosei Co., Ltd., product name “M-315”)
- A-400 Polyethylene glycol diacrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., product name “A-400”, molecular weight of polyethylene glycol: 400)
- A-TMM-3 Pentaerythritol triacrylate (manufactured
- UV irradiation conditions ⁇
- Light source High-pressure mercury lamp ⁇
- Light quantity 500 mJ / cm 2
- Illuminance 200 mW / cm 2 The illuminance and light intensity were confirmed by a UV illuminance / light meter “UVPF-36” manufactured by Eye Graphics.
- a release treatment of a light release type release sheet (product name “SP-PET382120” manufactured by Lintec Co., Ltd.) in which one side of a polyethylene terephthalate film was release-treated with a silicone-based release agent was applied to the obtained adhesive composition coating solution
- the surface was coated with a knife coater. And after heat-processing with respect to an application layer for 2 minutes at 100 degreeC, it irradiated with the ultraviolet-ray similarly to the above, and formed the 25-micrometer-thick 2nd adhesive layer.
- both the pressure-sensitive adhesive release sheet with the first pressure-sensitive adhesive layer obtained above and the light release-type release sheet with the second pressure-sensitive adhesive layer obtained above are in contact with each other.
- a pressure-sensitive adhesive sheet having a configuration of heavy release type release sheet / pressure-sensitive adhesive layer (thickness: 50 ⁇ m) / light release type release sheet was produced.
- the thickness of the pressure-sensitive adhesive layer is a value measured using a constant pressure thickness measuring instrument (manufactured by Teclock, product name “PG-02”) in accordance with JIS K7130.
- Examples 2 to 17, Comparative Examples 1 to 4 The ratio of each monomer constituting the (meth) acrylic acid ester polymer (A), the weight average molecular weight of the (meth) acrylic acid ester polymer (A), the type and blending amount of the active energy ray-curable component (B), A pressure-sensitive adhesive sheet was produced in the same manner as in Example 1 except that the type and amount of the crosslinking agent (C) and the amount of the silane coupling agent were changed as shown in Table 1. In Comparative Examples 1 and 4, the ultraviolet irradiation treatment was not performed.
- the above-mentioned weight average molecular weight (Mw) is a polystyrene-reduced weight average molecular weight measured under the following conditions (GPC measurement) using gel permeation chromatography (GPC).
- GPC measurement device manufactured by Tosoh Corporation, HLC-8020 GPC column (passed in the following order): TSK guard column HXL-H manufactured by Tosoh Corporation TSK gel GMHXL ( ⁇ 2) TSK gel G2000HXL ⁇ Measurement solvent: Tetrahydrofuran ⁇ Measurement temperature: 40 ° C.
- the pressure-sensitive adhesive wrapped in the polyester mesh was immersed in ethyl acetate at room temperature (23 ° C.) for 24 hours. Thereafter, the pressure-sensitive adhesive was taken out, air-dried for 24 hours in an environment of a temperature of 23 ° C. and a relative humidity of 50%, and further dried in an oven at 80 ° C. for 12 hours. After drying, the mass was weighed with a precision balance, and the mass of the pressure sensitive adhesive alone was calculated by subtracting the mass of the mesh alone. The mass at this time is M2.
- the gel fraction (G1;%) is represented by (M2 / M1) ⁇ 100. The results are shown in Table 2.
- Test Example 5 (Tensile test) After laminating a plurality of pressure-sensitive adhesive layers of the pressure-sensitive adhesive sheets obtained in Examples and Comparative Examples so as to have a total thickness of 600 ⁇ m, a 10 mm wide ⁇ 75 mm long sample was cut out. The sample is set in a tensile tester (product name “Tensilon”, manufactured by Orientec Co., Ltd.) so that the sample measurement site is 10 mm wide ⁇ 20 mm long (extension direction), and the measurement is performed in an environment of 23 ° C. and 50% RH. The sample was stretched at a tensile speed of 200 mm / min using a tensile tester, and the elongation at break (%) was measured. Moreover, the sample was extended to the breaking elongation and the maximum stress (N) was measured. The results are shown in Table 2.
- the obtained laminate was autoclaved for 30 minutes under the conditions of 50 ° C. and 0.5 MPa, and then allowed to stand at normal pressure, 23 ° C. and 50% RH for 15 hours. Subsequently, it was stored for 72 hours under 85 ° C. and 85% RH durability conditions. Thereafter, it was visually confirmed whether or not the pressure-sensitive adhesive layer had bubbles, floating or peeling, and blister resistance was evaluated according to the following criteria. The results are shown in Table 2. A: There were no bubbles, no floating, and no peeling. ⁇ : Only bubbles with a diameter of 0.1 mm or less were generated. X: Bubbles with a diameter of more than 0.1 mm, floating or peeling occurred.
- a stepped glass plate having a thickness of any one of 5 ⁇ m, 10 ⁇ m, 15 ⁇ m, and 20 ⁇ m was produced.
- the light release type release sheet was peeled off from the pressure sensitive adhesive sheets obtained in Examples and Comparative Examples, and the exposed pressure sensitive adhesive layer was replaced with a polyethylene terephthalate film having an easy adhesion layer (product name “PET A4300” manufactured by Toyobo Co., Ltd., thickness: 100 ⁇ m) easy adhesion layer.
- PET A4300 polyethylene terephthalate film having an easy adhesion layer manufactured by Toyobo Co., Ltd., thickness: 100 ⁇ m
- the heavy release type release sheet was peeled off to expose the pressure-sensitive adhesive layer.
- a laminator product name “LPD3214”, manufactured by Fuji Plastics Co., Ltd.
- the laminate is laminated on each stepped glass plate so that the adhesive layer covers the entire frame-like print, and this is used as an evaluation sample. did.
- Step followability is determined by whether or not the printing step is completely filled with the adhesive layer. If gaps or bubbles are observed at the interface between the printing step and the adhesive layer, it can follow the printing step. It is judged that there was not.
- the pressure-sensitive adhesive layers obtained in the examples were excellent in step following ability and high in film strength.
- the pressure-sensitive adhesive sheet of the present invention can be suitably used for bonding, for example, a display module and a protective plate having a step.
Abstract
Description
〔粘着剤〕
本実施形態に係る粘着剤は、少なくとも貼合される側の面に段差を有する一の表示体構成部材と、他の表示体構成部材とを貼合するための粘着剤である。表示体および表示体構成部材については、後述する。
ゲル分率変化率(%)={(G1-G2)/G2}×100
(メタ)アクリル酸エステル重合体(A)は、当該重合体を構成するモノマー単位として反応性官能基含有モノマーを含む。この反応性官能基含有モノマー由来の反応性官能基が架橋剤(C)と反応して、架橋構造が形成される。
粘着性組成物Pが前述した配合量で2官能以上の活性エネルギー線硬化性成分(B)を含有することにより、当該粘着性組成物Pを硬化して得られる粘着剤は、段差追従性に優れるとともに、高い被膜強度を示すものとなる。
粘着性組成物Pは、熱架橋性の架橋剤(C)を含有することで、加熱により(メタ)アクリル酸エステル重合体(A)を架橋して三次元網目構造を形成し、得られる粘着剤の凝集力を向上させ、また、当該粘着剤に耐久性を付与する。
粘着性組成物Pには、所望により、アクリル系粘着剤に通常使用されている各種添加剤、例えばシランカップリング剤、光重合開始剤、帯電防止剤、粘着付与剤、酸化防止剤、紫外線吸収剤、光安定剤、軟化剤、充填剤、屈折率調整剤などを添加することができる。
粘着性組成物Pは、(メタ)アクリル酸エステル重合体(A)を製造し、得られた(メタ)アクリル酸エステル重合体(A)と、活性エネルギー線硬化性成分(B)と、架橋剤(C)とを混合するとともに、所望により添加剤を加えることで製造することができる。
以上の粘着性組成物Pを、所望の対象物に塗布した後、熱架橋するとともに、活性エネルギー線の照射により硬化(活性エネルギー線硬化)することにより、本実施形態に係る粘着剤が得られる。
本実施形態に係る粘着剤のゲル分率(G1)は、40~80%であることが好ましく、特に45~70%であることが好ましく、さらには50~65%であることが好ましい。ゲル分率(G1)が40%以上であると、粘着剤の被膜強度を良好に確保することができる。また、ゲル分率(G1)が80%以下であると、粘着剤の段差追従性能を良好に確保することができる。
本実施形態に係る粘着剤は、厚さ600μm、幅10mmの粘着剤層とした場合に、23℃、50%RHの環境下で、測定長20mm、引張速度200mm/分で伸長したときの破断伸度が1000%以上であることが好ましく、特に1100~4000%であることが好ましく、さらには1200~2500%であることが好ましい。なお、この引張試験の具体的な方法は、後述する試験例に示す通りである。
本実施形態に係る粘着剤は、下記の式で示される段差追従率(%)が、20%以上であることが好ましく、特に25~80%であることが好ましく、さらには30~70%であることが好ましい。
段差追従率(%)={(所定耐久試験後、隙間や気泡無く埋められた状態が維持された段差の高さ(μm))/(粘着剤層の厚み)}×100
なお、段差追従率の試験方法は、後述する試験例に示す通りである。
図1に示すように、本実施形態に係る粘着シート1は、2枚の剥離シート12a,12bと、それら2枚の剥離シート12a,12bの剥離面と接するように当該2枚の剥離シート12a,12bに挟持された粘着剤層11とから構成される。なお、本明細書における剥離シートの剥離面とは、剥離シートにおいて剥離性を有する面をいい、剥離処理を施した面および剥離処理を施さなくても剥離性を示す面のいずれをも含むものである。
粘着シート1における粘着剤層11は、前述した粘着剤から構成され、すなわち、粘着性組成物Pを熱架橋および活性エネルギー線硬化してなる粘着剤から構成される。
剥離シート12a,12bとしては、例えば、ポリエチレンフィルム、ポリプロピレンフィルム、ポリブテンフィルム、ポリブタジエンフィルム、ポリメチルペンテンフィルム、ポリ塩化ビニルフィルム、塩化ビニル共重合体フィルム、ポリエチレンテレフタレートフィルム、ポリエチレンナフタレートフィルム、ポリブチレンテレフタレートフィルム、ポリウレタンフィルム、エチレン酢酸ビニルフィルム、アイオノマー樹脂フィルム、エチレン・(メタ)アクリル酸共重合体フィルム、エチレン・(メタ)アクリル酸エステル共重合体フィルム、ポリスチレンフィルム、ポリカーボネートフィルム、ポリイミドフィルム、フッ素樹脂フィルム等が用いられる。また、これらの架橋フィルムも用いられる。さらに、これらの積層フィルムであってもよい。
粘着シート1の一製造例としては、一方の剥離シート12a(または12b)の剥離面に、上記粘着性組成物Pの塗布液を塗布する。そして、塗布層に対して、加熱処理を行って粘着性組成物Pを熱架橋するとともに、活性エネルギー線を照射して粘着性組成物Pを硬化させ、粘着剤層11を形成する。そのように形成した粘着剤層11に他方の剥離シート12b(または12a)の剥離面を重ね合わせ、これを粘着シート1とする。なお、上記活性エネルギー線の照射は、粘着性組成物Pの塗布層を熱架橋し、当該塗布層に他方の剥離シート12b(または12a)の剥離面を重ね合せた後に行ってもよい。
本実施形態における粘着剤層11は、ヘイズ値(JIS K7136:2000に準じて測定した値)が、3%以下であることが好ましく、特に2%以下であることが好ましく、さらには1%以下であることが好ましい。ヘイズ値が3%以下であると、透明性が非常に高く、光学用途として好適なものとなる。
本実施形態における粘着シート1は、耐久条件後にも優れた段差追従性を発揮するために、粘着力(JIS Z0237:2009に準じて測定した値)が、5N/25mm以上であることが好ましく、10N/25mm以上であることがより好ましく、25N/25mm以上であることが特に好ましい。また、粘着シート1にリワーク性を付与する観点から、上記粘着力は、50N/25mm以下であることが好ましく、40N/25mm以下であることがより好ましく、35N/25mm以下であることが特に好ましい。なお、粘着力の試験方法の詳細は、試験例に記載するとおりである。
図2に示すように、本実施形態に係る表示体2は、少なくとも貼合される側の面に段差を有する第1の表示体構成部材21(一の表示体構成部材)と、第2の表示体構成部材22(他の表示体構成部材)と、それらの間に位置し、第1の表示体構成部材21および第2の表示体構成部材22を互いに貼合する粘着剤層11とを備えて構成される。本実施形態に係る表示体2では、第1の表示体構成部材21は、粘着剤層11側の面に段差を有しており、具体的には、印刷層3による段差を有している。
1.(メタ)アクリル酸エステル重合体の調製
アクリル酸n-ブチル90質量部およびアクリル酸10質量部を共重合させて、(メタ)アクリル酸エステル重合体(A)を調製した。この(メタ)アクリル酸エステル重合体(A)の分子量を後述する方法で測定したところ、重量平均分子量(Mw)40万であった。
上記工程(1)で得られた(メタ)アクリル酸エステル重合体(A)100質量部(固形分換算値;以下同じ)と、活性エネルギー線硬化性成分(B)としてのトリス(アクリロキシエチル)イソシアヌレート(東亜合成社製,製品名「M-315」)0.1質量部と、エポキシ系の架橋剤(C)としての1,3-ビス(N,N-ジグリシジルアミノメチル)シクロヘキサン(三菱ガス化学社製,製品名「TETRAD-C」,固形分濃度:100質量%)0.05質量部と、シランカップリング剤としての3-グリシドキシプロピルトリメトキシシラン(信越化学工業社製,製品名「KBM-403」)0.2質量部とを混合し、さらに、光重合開始剤としての1-ヒドロキシシクロヘキシルフェニルケトン(BASF社製,製品名「イルガキュア184」)を(B)成分の10質量%相当分の質量で添加し、十分に撹拌して、メチルエチルケトンで希釈することにより、固形分濃度37質量%の粘着性組成物の塗布溶液を得た。
[(メタ)アクリル酸エステル重合体]
BA:アクリル酸n-ブチル
AA:アクリル酸
2EHA:アクリル酸2-エチルヘキシル
MMA:メタクリル酸メチル
HEA:アクリル酸2-ヒドロキシエチル
IBXA:アクリル酸イソボルニル
ACMO:アクリロイルモルホリン
VAc:酢酸ビニル
[活性エネルギー線硬化性成分]
M-315:トリス(アクリロキシエチル)イソシアヌレート(東亜合成社製,製品名「M-315」)
A-400:ポリエチレングリコールジアクリレート(新中村化学工業社製,製品名「A-400」,ポリエチレングリコールの分子量:400)
A-TMM-3:ペンタエリスリトールトリアクリレート(新中村化学工業社製,製品名「A-TMM-3」)
A-DPH:ジペンタエリスリトールヘキサアクリレート(新中村化学工業社製,製品名「A-DPH」)
[架橋剤]
エポキシ-1:1,3-ビス(N,N’-ジグリシジルアミノメチル)シクロヘキサン(三菱ガス化学社製,製品名「TETRAD-C」)
エポキシ-2:N,N,N’,N’-テトラグリシジル-m-キシレンジアミン(三菱ガス化学社製,製品名「TETRAD-X」)
イソシアネート:トリメチロールプロパン変性トリレンジイソシアネート(綜研化学社製,製品名「L-45」)
得られた粘着性組成物の塗布溶液を、ポリエチレンテレフタレートフィルムの片面をシリコーン系剥離剤で剥離処理した重剥離型剥離シート(リンテック社製,製品名「SP-PET752150」)の剥離処理面に、ナイフコーターで塗布した。そして、塗布層に対し、100℃で2分間加熱処理した後、下記の条件で紫外線を照射して、厚さ25μmの第1の粘着剤層を形成した。
[紫外線照射条件]
・光源:高圧水銀灯
・光量:500mJ/cm2
・照度:200mW/cm2
なお、照度および光量は、アイグラフィックス社製のUV照度・光量計「UVPF-36」により確認した。
(メタ)アクリル酸エステル重合体(A)を構成する各モノマーの割合、(メタ)アクリル酸エステル重合体(A)の重量平均分子量、活性エネルギー線硬化性成分(B)の種類および配合量、架橋剤(C)の種類および配合量、ならびにシランカップリング剤の配合量を表1に示すように変更する以外、実施例1と同様にして粘着シートを製造した。なお、比較例1および4については、紫外線照射処理は行わなかった。
<測定条件>
・GPC測定装置:東ソー社製,HLC-8020
・GPCカラム(以下の順に通過):東ソー社製
TSK guard column HXL-H
TSK gel GMHXL(×2)
TSK gel G2000HXL
・測定溶媒:テトラヒドロフラン
・測定温度:40℃
実施例および比較例で得られた粘着シートから軽剥離型剥離シートを剥がし、露出した粘着剤層を、易接着層を有するポリエチレンテレフタレートフィルム(東洋紡社製,PET A4300,厚さ:100μm)の易接着層に貼合した。その積層体を、幅25mm、長さ100mmに裁断し、これをサンプルとした。当該サンプルから重剥離型剥離シートを剥がし、露出した粘着剤層を、ソーダライムガラス(日本板硝子社製)に貼付した。
実施例および比較例で得られた粘着シートの粘着剤層について、JIS K7361-1:1997に準じて、ヘイズメーター(日本電色工業社製,製品名「NDH-2000」)を用いてヘイズ値(%)を測定した。結果を表2に示す。
実施例および比較例で得られた粘着シートを80mm×80mmのサイズに裁断して、その粘着剤層をポリエステル製メッシュ(メッシュサイズ200)に包み、その質量を精密天秤にて秤量し、上記メッシュ単独の質量を差し引くことにより、粘着剤のみの質量を算出した。このときの質量をM1とする。
実施例および比較例において、活性エネルギー線硬化性成分(B)を添加しない以外、上記と同様にして粘着性組成物を調製した。その粘着性組成物を使用し、紫外線照射処理を行わない以外、上記と同様にして粘着シートを作製した。得られた粘着シートの粘着剤層について、試験例3と同様にしてゲル分率(G2;%)を測定した。このゲル分率をG2とし、試験例3で測定したゲル分率をG1としたときに、以下の式で示されるゲル分率変化率(%)を算出した。結果を表2に示す。
ゲル分率変化率(%)={(G1-G2)/G2}×100
実施例および比較例で得られた粘着シートの粘着剤層を、合計厚さが600μmとなるように複数層積層した後、10mm幅×75mm長のサンプルを切り出した。サンプル測定部位が10mm幅×20mm長(伸長方向)になるように上記サンプルを引張試験機(オリエンテック社製,製品名「テンシロン」)にセットし、23℃、50%RHの環境下で当該引張試験機を用いて引張速度200mm/分で伸長させ、破断伸度(%)を測定した。また、サンプルを破断伸度まで伸長させ、最大応力(N)を測定した。結果を表2に示す。
実施例および比較例で得られた粘着シートの粘着剤層を、片面にスズドープ酸化インジウム(ITO)からなる透明導電膜が設けられたポリエチレンテレフタレートフィルム(尾池工業社製,ITOフィルム,厚さ:125μm)の透明導電膜と、ポリカーボネート(PC)板(三菱ガス化学社製,製品名「ユーピロン・シート MR58」,厚さ:1mm)またはポリメチルメタクリレート(PMMA)からなるアクリル板(三菱ガス化学社製,製品名「ユーピロン・シート MR200」,厚さ:1mm)とで挟み、積層体を得た。
◎…気泡、浮きおよび剥がれが全くなかった。
○…直径0.1mm以下の気泡のみが発生した。
×…直径0.1mm超の気泡、浮きまたは剥がれが発生した。
実施例および比較例で得られた粘着シートの粘着剤層を、合計厚さが1mmとなるように複数層積層し、その積層体を裁断装置(荻野製作所社製,製品名「スーパーカッター PN1-600」)によって裁断した。裁断後における粘着剤層の裁断面(長さ:100mm)を目視にて確認し、以下の基準により被膜強度を評価した。結果を表2に示す。
○:裁断面に粘着剤層の欠けなし(被膜強度高い)
×:裁断面に粘着剤層の欠けあり(被膜強度低い)
ガラス板(NSGプレシジョン社製,製品名「コーニングガラス イーグルXG」,縦90mm×横50mm×厚み0.5mm)の表面に、紫外線硬化型インク(帝国インキ社製,製品名「POS-911墨」)を塗布厚が5μm、10μm、15μm及び20μmのいずれか1つとなるように額縁状(外形:縦90mm×横50mm,幅5mm)にスクリーン印刷した。次いで、紫外線を照射(80W/cm2,メタルハライドランプ2灯,ランプ高さ15cm,ベルトスピード10~15m/分)して、印刷した上記紫外線硬化型インクを硬化させ、印刷による段差(段差の高さ:5μm、10μm、15μm及び20μmのいずれか1つ)を有する段差付ガラス板を作製した。
段差追従率(%)={(耐久試験後、隙間や気泡無く埋められた状態が維持された段差の高さ(μm))/(粘着剤層の厚み:50μm)}×100
11…粘着剤層
12a,12b…剥離シート
2…表示体
21…第1の表示体構成部材
22…第2の表示体構成部材
3…印刷層
Claims (11)
- 少なくとも貼合される側の面に段差を有する一の表示体構成部材と、他の表示体構成部材とを貼合するための粘着剤であって、
前記粘着剤は、
重合体を構成するモノマー単位として反応性官能基含有モノマーを含む(メタ)アクリル酸エステル重合体(A)と、
2官能以上の活性エネルギー線硬化性成分(B)と、
熱架橋性の架橋剤(C)と
を含有する粘着性組成物を熱架橋および活性エネルギー線硬化してなり、
前記粘着性組成物中における前記活性エネルギー線硬化性成分(B)の含有量が、前記粘着剤のゲル分率(G1)と、前記粘着性組成物から前記活性エネルギー線硬化性成分(B)を除いた粘着性組成物を熱架橋してなる粘着剤のゲル分率(G2)とが、実質的に同一になる量であり、かつ
厚さ600μm、幅10mmの粘着剤層とした場合に、23℃、50%RHの環境下で、測定長20mm、引張速度200mm/分で破断伸度まで伸長したときの最大応力が、2.8N以上である
ことを特徴とする粘着剤。 - 前記ゲル分率(G1)が40~80%であることを特徴とする請求項1に記載の粘着剤。
- 厚さ600μm、幅10mmの粘着剤層とした場合に、23℃、50%RHの環境下で、測定長20mm、引張速度200mm/分で伸長したときの破断伸度が、1000%以上であることを特徴とする請求項1または2に記載の粘着剤。
- 前記(メタ)アクリル酸エステル重合体(A)の重量平均分子量は、20万~100万であることを特徴とする請求項1~3のいずれか一項に記載の粘着剤。
- 前記(メタ)アクリル酸エステル重合体(A)は、当該重合体を構成するモノマー単位として前記反応性官能基含有モノマーを5~30質量%含有することを特徴とする請求項1~4のいずれか一項に記載の粘着剤。
- 前記反応性官能基含有モノマーの反応性官能基が、カルボキシル基および/または水酸基であり、
前記架橋剤(C)が、イソシアネート系架橋剤および/またはエポキシ系架橋剤である
ことを特徴とする請求項1~5のいずれか一項に記載の粘着剤。 - 請求項1~6のいずれか一項に記載の粘着剤からなる粘着剤層を有する粘着シート。
- 前記粘着剤層の厚さは、10~400μmであることを特徴とする請求項7に記載の粘着シート。
- 前記粘着シートは、2枚の剥離シートを備えており、
前記粘着剤層は、前記2枚の剥離シートの剥離面と接するように前記剥離シートに挟持されている
ことを特徴とする請求項7または8に記載の粘着シート。 - 少なくとも貼合される側の面に段差を有する一の表示体構成部材と、
他の表示体構成部材と、
前記一の表示体構成部材と前記他の表示体構成部材とを互いに貼合する粘着剤層と
を備えた表示体であって、
前記粘着剤層は、請求項7~9のいずれか一項に記載の粘着シートの粘着剤層である
ことを特徴とする表示体。 - 前記段差は、平面視額縁状になっていることを特徴とする請求項10に記載の表示体。
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JP2018028040A (ja) * | 2016-08-19 | 2018-02-22 | リンテック株式会社 | 粘着シート、表示体およびそれらの製造方法 |
JP2018044134A (ja) * | 2016-09-16 | 2018-03-22 | リンテック株式会社 | 粘着シート、表示体およびそれらの製造方法 |
JP2018127561A (ja) * | 2017-02-09 | 2018-08-16 | リンテック株式会社 | 粘着シート |
JP2019035061A (ja) * | 2017-08-21 | 2019-03-07 | リンテック株式会社 | 粘着シートおよび表示体 |
WO2023189284A1 (ja) * | 2022-03-31 | 2023-10-05 | 王子ホールディングス株式会社 | 粘着剤組成物及び粘着シート |
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2014
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- 2014-10-23 CN CN201480082732.8A patent/CN107077801B/zh active Active
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CN108300385A (zh) * | 2016-08-19 | 2018-07-20 | 琳得科株式会社 | 粘接片材、显示体以及它们的制造方法 |
KR20180020869A (ko) * | 2016-08-19 | 2018-02-28 | 린텍 가부시키가이샤 | 점착 시트, 표시체 및 그들의 제조 방법 |
CN108300385B (zh) * | 2016-08-19 | 2022-02-15 | 琳得科株式会社 | 粘接片材、显示体以及它们的制造方法 |
KR102318106B1 (ko) * | 2016-08-19 | 2021-10-28 | 린텍 가부시키가이샤 | 점착 시트, 표시체 및 그들의 제조 방법 |
JP2018028040A (ja) * | 2016-08-19 | 2018-02-22 | リンテック株式会社 | 粘着シート、表示体およびそれらの製造方法 |
KR102271568B1 (ko) * | 2016-09-16 | 2021-07-02 | 린텍 가부시키가이샤 | 점착 시트, 표시체 및 그들의 제조 방법 |
CN108300361A (zh) * | 2016-09-16 | 2018-07-20 | 琳得科株式会社 | 粘着片、显示体及其制造方法 |
KR20180030748A (ko) * | 2016-09-16 | 2018-03-26 | 린텍 가부시키가이샤 | 점착 시트, 표시체 및 그들의 제조 방법 |
CN108300361B (zh) * | 2016-09-16 | 2021-11-09 | 琳得科株式会社 | 粘着片、显示体及其制造方法 |
JP2018044134A (ja) * | 2016-09-16 | 2018-03-22 | リンテック株式会社 | 粘着シート、表示体およびそれらの製造方法 |
JP2018127561A (ja) * | 2017-02-09 | 2018-08-16 | リンテック株式会社 | 粘着シート |
CN108410374A (zh) * | 2017-02-09 | 2018-08-17 | 琳得科株式会社 | 压敏粘合片 |
JP2019035061A (ja) * | 2017-08-21 | 2019-03-07 | リンテック株式会社 | 粘着シートおよび表示体 |
JP7170387B2 (ja) | 2017-08-21 | 2022-11-14 | リンテック株式会社 | 粘着シートおよび表示体 |
WO2023189284A1 (ja) * | 2022-03-31 | 2023-10-05 | 王子ホールディングス株式会社 | 粘着剤組成物及び粘着シート |
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JP6251293B6 (ja) | 2018-06-27 |
JP6251293B2 (ja) | 2017-12-20 |
TWI677546B (zh) | 2019-11-21 |
TW201623521A (zh) | 2016-07-01 |
KR20170072198A (ko) | 2017-06-26 |
JPWO2016063405A1 (ja) | 2017-04-27 |
CN107077801A (zh) | 2017-08-18 |
CN107077801B (zh) | 2019-10-15 |
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