KR102706292B1 - Pressure-sensitive adhesive composition, pressure-sensitive adhesive member, optical member and electronic member - Google Patents

Abstract

Provided are an adhesive composition forming an adhesive layer having excellent stress dissipation properties, an adhesive member having an adhesive layer formed by the adhesive composition, and an optical member or electronic member having the adhesive member.
The adhesive composition of the present invention is an adhesive composition comprising a polymer (A) having a monomer unit derived from a (meth)acrylic acid alkyl ester, and the loss tangent tanδ of an adhesive layer formed by curing the adhesive composition in the entire temperature range of -40°C to 150°C is 0.10 or more.

Description

{PRESSURE-SENSITIVE ADHESIVE COMPOSITION, PRESSURE-SENSITIVE ADHESIVE MEMBER, OPTICAL MEMBER AND ELECTRONIC MEMBER}

The present invention relates to an adhesive composition, an adhesive member having an adhesive layer formed from the adhesive composition, and an optical member or electronic member having the adhesive member.

In order to provide rigidity or shock resistance to optical or electronic components such as touch panels using LCDs, lens sections of cameras, and electronic devices, an adhesive film is sometimes adhered to the exposed surface side (e.g., Patent Document 1). Such an adhesive film usually has a substrate layer and an adhesive layer.

In the case of the optical or electronic components as described above, there are cases where a load due to a pressing force is applied in various situations such as during assembly, processing, transportation, and use, and a problem occurs in which the optical or electronic components are damaged due to such a load.

Japanese Patent Publication No. 2014-234460

With a view to employing a stress-dispersing film having excellent stress dispersing properties as an adhesive film, a study was conducted on the forming material of an adhesive layer installed in such a stress-dispersing film.

The object of the present invention is to provide an adhesive composition forming an adhesive layer having excellent stress dissipation properties, an adhesive member having an adhesive layer formed from the adhesive composition, and an optical member or electronic member having the adhesive member.

The adhesive composition of the present invention comprises:

An adhesive composition comprising a polymer (A) having a monomer unit derived from (meth)acrylic acid alkyl ester,

The loss tangent tanδ of the adhesive layer formed by curing the adhesive composition is 0.10 or more in the entire temperature range of -40°C to 150°C.

In one embodiment, the monomer unit derived from the (meth)acrylic acid alkyl ester is a monomer unit (I) derived from the (meth)acrylic acid alkyl ester having an alkyl group having 1 to 20 carbon atoms as an alkyl ester moiety.

In one embodiment, the polymer (A) has a monomer unit (II) derived from a (meth)acrylic acid ester having an OH group and/or a COOH group in the molecule.

In one embodiment, the adhesive composition of the present invention comprises a bifunctional or higher organic polyisocyanate crosslinking agent and/or an epoxy crosslinking agent.

In one embodiment, an adhesive composition comprises a polymer having a monomer unit (I) derived from a (meth)acrylic acid alkyl ester having an alkyl group having 1 to 20 carbon atoms as an alkyl ester moiety and a monomer unit (II) derived from a (meth)acrylic acid ester having an OH group and/or a COOH group in the molecule, and a bifunctional or higher organic polyisocyanate crosslinking agent and/or an epoxy crosslinking agent, wherein when the molar content ratio of NCO groups in the adhesive composition is [NCO], the molar content ratio of epoxy groups in the adhesive composition is [epoxy], the molar content ratio of OH groups in the adhesive composition is [OH], and the molar content ratio of COOH groups in the adhesive composition is [COOH], 0<([NCO]+[epoxy])/([OH]+[COOH])<0.05.

In one embodiment, the adhesive composition of the present invention comprises a polymer (B) having a weight average molecular weight of 1,000 or more and less than 30,000 and having a monomer unit derived from a (meth)acrylic acid ester containing an alicyclic structure represented by the chemical formula 1.

(In chemical formula 1, R ¹ is a hydrogen atom or a methyl group, and R ² is a hydrocarbon group having an alicyclic structure.)

The adhesive member of the present invention has an adhesive layer formed from the adhesive composition.

The optical member of the present invention comprises the adhesive member.

The electronic member of the present invention comprises the adhesive member.

According to the present invention, it is possible to provide an adhesive composition forming an adhesive layer having excellent stress dissipation properties, an adhesive member having an adhesive layer formed from the adhesive composition, and an optical member or electronic member having the adhesive member.

Figure 1 is a schematic cross-sectional view of an adhesive member according to one embodiment of the present invention.

In this specification, when the expression "(meth)acrylic" appears, it means "acrylic and/or methacrylic", and when the expression "(meth)acrylate" appears, it means "acrylate and/or methacrylate". In addition, when the expression "weight" appears in this specification, it may be read as "mass", which is commonly used as an SI unit indicating weight.

In cases where there is an expression such as “monomer unit (A) derived from (a)” in the present specification, the monomer unit (A) is a structural unit formed by cleavage of the unsaturated double bond of the monomer (a) by polymerization. In addition, the structural unit formed by cleavage of the unsaturated double bond by polymerization is a structural unit of “-RpRqC-CRrRs-” formed by cleavage of the unsaturated double bond “C=C” of the structure “RpRqC=CRrRs” (Rp, Rq, Rr, Rs are any appropriate groups bonded to a carbon atom by a single bond) by polymerization.

In this specification, the content ratio of the monomer unit in the polymer can be known, for example, by various structural analyses (for example, NMR, etc.) of the polymer. In addition, even without performing various structural analyses as described above, the content ratio of the monomer unit derived from each monomer used when producing the polymer may be used as the content ratio of the monomer unit in the polymer, calculated based on the usage amounts of each monomer used when producing the polymer. That is, the content ratio of a certain monomer (m) among the total monomer components used when producing the polymer may be treated as the content ratio of the monomer unit derived from the monomer (m) in the polymer.

≪≪A. Adhesive composition≫≫

The adhesive composition of the present invention comprises a polymer (A) having a monomer unit derived from a (meth)acrylic acid alkyl ester.

The content ratio of the polymer (A) in the pressure-sensitive adhesive composition of the present invention is preferably 80 wt% to 100 wt%, more preferably 85 wt% to 100 wt%, even more preferably 90 wt% to 100 wt%, particularly preferably 92.5 wt% to 100 wt%, and most preferably 95 wt% to 100 wt%. When the content ratio of the polymer (A) in the pressure-sensitive adhesive composition of the present invention is within the above range, it is possible to provide an adhesive composition that forms an adhesive layer having better stress dispersibility.

The adhesive composition of the present invention has a loss tangent tanδ of an adhesive layer formed by curing the adhesive composition in the entire temperature range of -40°C to 150°C of 0.10 or more. By having the loss tangent tanδ of 0.10 or more in the entire temperature range of -40°C to 150°C, an adhesive composition forming an adhesive layer having excellent stress dispersibility can be provided. In addition, a method for measuring the loss tangent tanδ will be described later.

The adhesive composition of the present invention has an upper limit of the loss tangent tanδ of an adhesive layer formed by curing the adhesive composition in the entire temperature range of -40°C to 150°C, preferably 2.40 or less, more preferably 2.20 or less, even more preferably 2.00 or less, and particularly preferably 1.80 or less. When the upper limit of the loss tangent tanδ is within the above range, an adhesive composition forming an adhesive layer having better stress dispersibility can be provided.

The lower limit of the loss tangent tanδ of the adhesive layer formed by curing the adhesive composition in the entire temperature range of -40°C to 150°C is preferably 0.12 or more, more preferably 0.14 or more, even more preferably 0.16 or more, and particularly preferably 0.18 or more. When the lower limit of the loss tangent tanδ is within the above range, an adhesive composition forming an adhesive layer having better stress dispersibility can be provided.

Polymer (A) has a monomer unit derived from a (meth)acrylic acid alkyl ester. In polymer (A), the monomer unit derived from a (meth)acrylic acid alkyl ester may be one type or two or more types.

The content ratio of the monomer unit derived from the (meth)acrylic acid alkyl ester in the polymer (A) is preferably 90 wt% to 99.5 wt%, more preferably 91 wt% to 99 wt%, even more preferably 92 wt% to 98.5 wt%, particularly preferably 93 wt% to 98.2 wt%, and most preferably 94 wt% to 98 wt%. When the content ratio of the monomer unit derived from the (meth)acrylic acid alkyl ester in the polymer (A) is within the above range, an adhesive composition forming an adhesive layer having better stress dispersibility can be provided.

The monomer unit derived from the above (meth)acrylic acid alkyl ester can employ any appropriate monomer unit derived from the (meth)acrylic acid alkyl ester, as long as it does not impair the effects of the present invention. As such a monomer unit, from the viewpoint of better demonstrating the effects of the present invention, a monomer unit (I) derived from the (meth)acrylic acid alkyl ester having an alkyl group having 1 to 20 carbon atoms as the alkyl ester moiety is preferable.

As (meth)acrylic acid alkyl esters having an alkyl group having 1 to 20 carbon atoms as an alkyl ester moiety, for example, methyl (meth)acrylate, ethyl (meth)acrylate, n-butyl (meth)acrylate, s-butyl (meth)acrylate, t-butyl (meth)acrylate, isobutyl (meth)acrylate, hexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, n-octyl (meth)acrylate, isooctyl (meth)acrylate, n-nonyl (meth)acrylate, isononyl (meth)acrylate, n-decyl (meth)acrylate, isodecyl (meth)acrylate, n-dodecyl (meth)acrylate, n-tridecyl (meth)acrylate, n-tetradecyl (meth)acrylate, etc. You can hear it.

The polymer (A) preferably has a monomer unit (II) derived from a (meth)acrylic acid ester having an OH group and/or a COOH group in the molecule. The number of monomer units (II) derived from a (meth)acrylic acid ester having an OH group and/or a COOH group in the molecule in the polymer (A) may be only one type or may be two or more types. When the polymer (A) has a monomer unit (II) derived from a (meth)acrylic acid ester having an OH group and/or a COOH group in the molecule, an adhesive composition forming an adhesive layer having better stress dispersibility can be provided.

The content ratio of the monomer unit (II) derived from a (meth)acrylic acid ester having an OH group and/or a COOH group in the molecule in the polymer (A) is preferably 0.5 to 10 wt%, more preferably 1 to 9 wt%, still more preferably 1.5 to 8 wt%, particularly preferably 1.8 to 7 wt%, and most preferably 2 to 6 wt%. When the content ratio of the monomer unit (II) derived from a (meth)acrylic acid ester having an OH group and/or a COOH group in the molecule in the polymer (A) is within the above range, an adhesive composition which forms an adhesive layer having better stress dispersibility can be provided.

Examples of (meth)acrylic acid esters having an OH group in the molecule include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, 8-hydroxyoctyl (meth)acrylate, 10-hydroxydecyl (meth)acrylate, 12-hydroxylauryl (meth)acrylate, (4-hydroxymethylcyclohexyl)methyl acrylate, N-methylol (meth)acrylamide, vinyl alcohol, allyl alcohol, 2-hydroxyethyl vinyl ether, 4-hydroxybutyl vinyl ether, diethylene glycol monovinyl ether, and the like.

Examples of (meth)acrylic acid esters having a COOH group in the molecule include (meth)acrylic acid, carboxyethyl (meth)acrylate, carboxypentyl (meth)acrylate, itaconic acid, maleic acid, fumaric acid, crotonic acid, and isocrotonic acid.

The polymer (A) may have a monomer unit (III) derived from another monomer. In the polymer (A), the monomer unit (III) derived from another monomer may be one type or two or more types.

Examples of other monomers include a cyano group-containing monomer, a vinyl ester monomer, an aromatic vinyl monomer, an amide group-containing monomer, an imide group-containing monomer, an amino group-containing monomer, an epoxy group-containing monomer, a vinyl ether monomer, N-acryloylmorpholine, a sulfo group-containing monomer, a phosphoric acid group-containing monomer, and an acid anhydride group-containing monomer.

The adhesive composition of the present invention preferably contains a bifunctional or higher organic polyisocyanate crosslinking agent and/or an epoxy crosslinking agent. The bifunctional or higher organic polyisocyanate crosslinking agent and/or the epoxy crosslinking agent that can be included in the adhesive composition of the present invention may be one type or two or more types.

In the adhesive composition of the present invention, the total content of the bifunctional or higher organic polyisocyanate crosslinking agent and the epoxy crosslinking agent is preferably 0.001 part by weight to 0.4 part by weight, more preferably 0.0025 part by weight to 0.3 part by weight, even more preferably 0.005 part by weight to 0.2 part by weight, particularly preferably 0.0075 part by weight to 0.15 part by weight, and most preferably 0.01 part by weight to 0.1 part by weight, relative to 100 parts by weight of the polymer (A). When the total content of the bifunctional or higher organic polyisocyanate crosslinking agent and the epoxy crosslinking agent in the adhesive composition of the present invention is within the above range relative to 100 parts by weight of the polymer (A), an adhesive composition forming an adhesive layer having better stress dispersibility can be provided.

Examples of the bifunctional or higher organic polyisocyanate crosslinking agent include lower aliphatic polyisocyanates such as butylene diisocyanate and hexamethylene diisocyanate; alicyclic isocyanates such as cyclopentylene diisocyanate, cyclohexylene diisocyanate and isophorone diisocyanate; aromatic isocyanates such as 2,4-tolylene diisocyanate, 4,4'-diphenylmethane diisocyanate and xylylene diisocyanate; Isocyanate adducts such as trimethylolpropane/tolylene diisocyanate trimer adduct (e.g., manufactured by Nippon Polyurethane Kogyo Co., Ltd., trade name “Coronate L”), trimethylolpropane/hexamethylene diisocyanate trimer adduct (e.g., manufactured by Nippon Polyurethane Kogyo Co., Ltd., trade name “Coronate HL”), and isocyanurate forms of hexamethylene diisocyanate (e.g., manufactured by Nippon Polyurethane Kogyo Co., Ltd., trade name “Coronate HX”); etc.

Examples of the epoxy crosslinking agent include bisphenol A, epichlorohydrin type epoxy resin, ethylene glycidyl ether, polyethylene glycol diglycidyl ether, glycerin diglycidyl ether, glycerin triglycidyl ether, 1,6-hexanediol glycidyl ether, trimethylolpropane triglycidyl ether, diglycidyl aniline, diamine glycidyl amine, N,N,N',N'-tetraglycidyl-m-xylenediamine (e.g., manufactured by Mitsubishi Gas Chemical Co., Ltd., trade name "TETRAD-X"), 1,3-bis(N,N-diglycidylaminomethyl)cyclohexane (e.g., manufactured by Mitsubishi Gas Chemical Co., Ltd., trade name "TETRAD-C").

The adhesive composition of the present invention is preferably an adhesive composition comprising a polymer having a monomer unit (I) derived from a (meth)acrylic acid alkyl ester having an alkyl group having 1 to 20 carbon atoms as an alkyl ester moiety and a monomer unit (II) derived from a (meth)acrylic acid ester having an OH group and/or a COOH group in the molecule, and a bifunctional or higher organic polyisocyanate-based crosslinking agent and/or an epoxy-based crosslinking agent, wherein when the molar content ratio of an NCO group in the adhesive composition is [NCO], the molar content ratio of an epoxy group in the adhesive composition is [epoxy], the molar content ratio of an OH group in the adhesive composition is [OH], and the molar content ratio of a COOH group in the adhesive composition is [COOH], 0<([NCO]+[epoxy])/([OH]+[COOH])<0.05. By having ([NCO]+[epoxy])/([OH]+[COOH]) within the above range, an adhesive composition forming an adhesive layer having superior stress dissipation properties can be provided.

The adhesive composition of the present invention may contain a polymer (B) having a weight average molecular weight of 1,000 or more and less than 30,000 and having a monomer unit derived from a (meth)acrylic acid ester containing an alicyclic structure represented by the chemical formula 1.

<Chemical Formula 1>

(In chemical formula 1, R ¹ is a hydrogen atom or a methyl group, and R ² is a hydrocarbon group having an alicyclic structure.)

There may be only one type of polymer (B) or two or more types.

The weight average molecular weight of the polymer (B) is preferably 1000 to 30000, more preferably 1250 to 25000, even more preferably 1500 to 20000, particularly preferably 1750 to 15000, and most preferably 2000 to 10000. When the weight average molecular weight of the polymer (B) is within the above range, even if the amount of the crosslinking agent is increased, an adhesive composition forming an adhesive layer having better stress dispersibility can be provided.

The content ratio of the polymer (B) in the adhesive composition of the present invention is preferably 0.5 to 50 parts by weight relative to 100 parts by weight of the polymer (A), more preferably 1 to 45 parts by weight, even more preferably 2 to 40 parts by weight, particularly preferably 3 to 35 parts by weight, and most preferably 4 to 30 parts by weight. Since the content ratio of the polymer (B) in the adhesive composition of the present invention is within the above range relative to 100 parts by weight of the polymer (A), even if the amount of the crosslinking agent is increased, an adhesive composition which forms an adhesive layer having better stress dispersibility can be provided.

The content ratio of the monomer unit derived from the (meth)acrylic acid ester containing an alicyclic structure represented by the chemical formula 1 in the polymer (B) is preferably 40 wt% to 99.5 wt%, more preferably 42.5 wt% to 99 wt%, still more preferably 45 wt% to 98.5 wt%, particularly preferably 47.5 wt% to 98 wt%, and most preferably 50 wt% to 97.5 wt%. Since the content ratio of the monomer unit derived from the (meth)acrylic acid ester containing an alicyclic structure represented by the chemical formula 1 in the polymer (B) is within the above range, even if the amount of the crosslinking agent is increased, an adhesive composition which forms an adhesive layer having better stress dispersing properties can be provided.

As the alicyclic structure-containing (meth)acrylic acid ester represented by the above chemical formula 1, examples thereof include cyclohexyl (meth)acrylate, dicyclopentanyl (meth)acrylate, dicyclopentanyloxyethyl methacrylate, dicyclopentanyloxyethyl acrylate, tricyclopentanyl methacrylate, tricyclopentanyl acrylate, 1-adamantyl methacrylate, 1-adamantyl acrylate, 2-methyl-2-adamantyl methacrylate, 2-methyl-2-adamantyl acrylate, 2-ethyl-2-adamantyl methacrylate, 2-ethyl-2-adamantyl acrylate, and the like.

The polymer (B) may have monomer units (IV) derived from other monomers. In the polymer (B), the monomer units (IV) derived from other monomers may be one type or two or more types.

Other monomers that may be included in the polymer (B) include, for example, methyl (meth)acrylate, ethyl (meth)acrylate, n-butyl (meth)acrylate, s-butyl (meth)acrylate, t-butyl (meth)acrylate, isobutyl (meth)acrylate, hexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, n-octyl (meth)acrylate, isooctyl (meth)acrylate, n-nonyl (meth)acrylate, isononyl (meth)acrylate, n-decyl (meth)acrylate, isodecyl (meth)acrylate, n-dodecyl (meth)acrylate, n-tridecyl (meth)acrylate, n-tetradecyl (meth)acrylate, acrylic acid, methacrylic acid, carboxyethyl acrylate, Examples include carboxypentyl acrylate, itaconic acid, maleic acid, fumaric acid, crotonic acid, and isocrotonic acid.

Polymer (A) and polymer (B) can be produced by any appropriate method as long as the effects of the present invention are not impaired. Examples of such production methods include solution polymerization, emulsion polymerization, bulk polymerization, suspension polymerization, photopolymerization (active energy ray polymerization), etc. Among these production methods, solution polymerization is preferable from the viewpoints of cost and productivity. The obtained polymer (A) may be any of a random copolymer, a block copolymer, an alternating copolymer, a graft copolymer, etc. The obtained polymer (B) may be any of a random copolymer, a block copolymer, an alternating copolymer, a graft copolymer, etc.

Examples of methods for solution polymerization include a method of dissolving monomer components or polymerization initiators in a solvent, heating, and polymerizing to obtain a polymer solution.

In solution polymerization, the heating temperature when polymerizing by heating may be, for example, 50°C to 90°C. The heating time in solution polymerization may be, for example, 1 hour to 24 hours.

Any appropriate solvent can be used as a solvent used in solution polymerization, as long as it does not impair the effects of the present invention. Examples of such solvents include aromatic hydrocarbons such as toluene, benzene, and xylene; esters such as ethyl acetate and n-butyl acetate; aliphatic hydrocarbons such as n-hexane and n-heptane; alicyclic hydrocarbons such as cyclohexane and methylcyclohexane; ketones such as methyl ethyl ketone and methyl isobutyl ketone; and organic solvents such as the like. The solvent may be one type only or two or more types.

In the production of polymer (A) and polymer (B), a polymerization initiator can be used. Such polymerization initiators may be used alone or in combination of two or more. Examples of such polymerization initiators include azo initiators such as 2,2'-azobisisobutyronitrile, 2,2'-azobis(2-amidinopropane)dihydrochloride, 2,2'-azobis[2-(5-methyl-2-imidazolin-2-yl)propane]dihydrochloride, 2,2'-azobis(2-methylpropionamidine)disulfate, 2,2'-azobis(N,N'-dimethyleneisobutylamidine), and 2,2'-azobis[N-(2-carboxyethyl)-2-methylpropionamidine]hydrate (manufactured by Wako Pure Chemical Industries, Ltd., VA-057); Persulfates such as potassium persulfate and ammonium persulfate; peroxide initiators such as di(2-ethylhexyl)peroxydicarbonate, di(4-t-butylcyclohexyl)peroxydicarbonate, di-sec-butylperoxydicarbonate, t-butylperoxyneodecanoate, t-hexylperoxypivalate, t-butylperoxypivalate, dilauroyl peroxide, di-n-octanoyl peroxide, 1,1,3,3-tetramethylbutylperoxy-2-ethylhexanoate, di(4-methylbenzoyl)peroxide, dibenzoyl peroxide, t-butylperoxyisobutyrate, 1,1-di(t-hexylperoxy)cyclohexane, t-butyl hydroperoxide, and hydrogen peroxide; Examples thereof include redox initiators combining peroxides and reducing agents, such as combinations of persulfate and sodium bisulfite, combinations of peroxide and sodium ascorbate, etc.

Any appropriate amount of the polymerization initiator may be used as long as it does not impair the effects of the present invention. For example, the amount is preferably 0.01 to 5 parts by weight per 100 parts by weight of the monomer component.

In the production of polymer (A) and polymer (B), a chain transfer agent can be used. This chain transfer agent may be one type or two or more types. Examples of this chain transfer agent include lauryl mercaptan, glycidyl mercaptan, mercaptoacetic acid, 2-mercaptoethanol, thioglycolic acid, methyl thioglycolate, 2-ethylhexyl thioglycolate, 2,3-dimercapto-1-propanol, and the like.

Any appropriate amount of the chain transfer agent can be used as long as it does not impair the effects of the present invention. For example, the amount is preferably 0.01 to 5 parts by weight per 100 parts by weight of the monomer component.

In the production of polymer (A) and polymer (B), any other appropriate additive that can generally be used in a polymerization reaction can be used.

The adhesive composition of the present invention may contain a crosslinking catalyst. Any appropriate crosslinking catalyst may be employed as the crosslinking catalyst within a range that does not impair the effects of the present invention. Examples of such crosslinking catalysts include metal-based crosslinking catalysts (particularly tin-based crosslinking catalysts) such as tetra-n-butyl titanate, tetraisopropyl titanate, ferric nasem, butyltin oxide, and dioctyltin dilaurate. The crosslinking catalyst may be one type or two or more types.

Any appropriate amount of the crosslinking catalyst may be used within a range that does not impair the effects of the present invention. For example, the amount is preferably 0.001 to 0.05 parts by weight per 100 parts by weight of the monomer component.

The adhesive composition of the present invention may contain any other appropriate additives as long as the effects of the present invention are not impaired. Examples of such other additives include powders such as silane coupling agents, crosslinking retarders, emulsifiers, colorants, pigments, dyes, surfactants, plasticizers, tackifiers, surface lubricants, leveling agents, softeners, antioxidants, anti-aging agents, light stabilizers, ultraviolet absorbers, polymerization inhibitors, inorganic fillers, organic fillers, metal powders, particles, thin films, etc. These other additives may be used alone or in combination of two or more.

≪≪B. Absence of Adhesion≫≫

The adhesive member of the present invention has an adhesive layer formed from the adhesive composition of the present invention.

The adhesive member of the present invention may include only an adhesive layer, or may include an adhesive layer and another member.

In the adhesive member of the present invention, in the case where the adhesive layer is exposed as the outermost layer, any appropriate separator (release sheet) may be installed on the exposed surface side. The separator (release sheet) may also include the substrate described below.

The adhesive layer is formed by the adhesive composition of the present invention. For example, the adhesive composition of the present invention is applied onto any suitable substrate, dried if necessary, to form an adhesive layer on the substrate. Thereafter, when the substrate is peeled off, the adhesive member of the present invention consisting only of the adhesive layer is obtained. In addition, for example, by applying the adhesive composition of the present invention onto any suitable substrate, drying if necessary, to form an adhesive layer on the substrate, and leaving the substrate as it is, an adhesive member including the adhesive layer and the substrate is obtained. In addition, for example, by applying the adhesive composition of the present invention onto any suitable substrate, drying if necessary, to form an adhesive layer on the substrate, and peeling the substrate, the adhesive layer obtained is placed on another member (for example, another substrate), an adhesive member including the adhesive layer and the substrate is obtained. In addition, for example, by applying the adhesive composition of the present invention onto any appropriate substrate, drying as necessary to form an adhesive layer on the substrate, and transferring the adhesive layer formed on the substrate to another member (e.g., another substrate), an adhesive member including an adhesive layer and a substrate is obtained.

Examples of methods for applying the adhesive composition include roll coating, gravure coating, reverse coating, roll brush, spray coating, air knife coating, extrusion coating using a die coater, etc.

The substrate may be composed of a single layer or multiple layers. The substrate may also be stretched.

The thickness of the substrate can be set to any appropriate thickness depending on the intended use. From the viewpoint of sufficiently expressing the effects of the present invention, the thickness of the substrate is preferably 4 µm to 500 µm, more preferably 10 µm to 400 µm, even more preferably 15 µm to 350 µm, and particularly preferably 20 µm to 300 µm.

As the material of the substrate, any appropriate material can be adopted depending on the intended use. Examples of such materials include plastic, paper, metal film, non-woven fabric, etc. Among these materials, plastic is preferable in that it can better express the effects of the present invention.

Examples of the above plastics include polyester resins, polyolefin resins, polyamide resins, and polyimide resins. Examples of the polyester resins include polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate. Examples of the polyolefin resins include homopolymers of olefin monomers, copolymers of olefin monomers, and the like. Specific examples of the polyolefin resins include homopolypropylene; propylene copolymers having an ethylene component as a copolymerization component, such as a block type, a random type, and a graft type; reactor TPO; ethylene polymers having a low density, a high density, a linear low density, and an ultra-low density; Ethylene copolymers such as ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-butyl acrylate copolymer, ethylene-methacrylic acid copolymer, and ethylene-methyl methacrylate copolymer; etc. In terms of further expressing the effects of the present invention, among these, the plastic is preferably a polyester resin, and more preferably polyethylene terephthalate.

The substrate may contain any appropriate additives as needed. Examples of additives that may be contained in the substrate include antioxidants, ultraviolet absorbers, light stabilizers, antistatic agents, fillers, pigments, etc. The type, number, and amount of additives that may be contained in the substrate may be appropriately set depending on the purpose.

Fig. 1 is a schematic cross-sectional view of an adhesive member according to one embodiment of the present invention. In Fig. 1, the adhesive member (100) of the present invention includes a substrate (10), an adhesive layer (20), and a separator (30).

≪≪C. Optical Absence, Electronic Absence≫≫

The adhesive member of the present invention has an adhesive layer having excellent stress dissipation properties. Therefore, it can be suitably used as a protective material for the purpose of protecting an optical member or an electronic member from external impact. That is, the optical member of the present invention comprises the adhesive member of the present invention. Furthermore, the electronic member of the present invention comprises the adhesive member of the present invention.

[Example]

Hereinafter, the present invention will be specifically described by examples, but the present invention is not limited to these examples at all. In addition, the test and evaluation methods in the examples, etc. are as follows. In addition, when "part" is described, it means "part by weight" unless otherwise specified, and when "%" is described, it means "weight%" unless otherwise specified.

<Measurement of weight average molecular weight>

The weight average molecular weight (Mw) of the polymer was measured using a GPC apparatus (HLC-8220GPC) manufactured by Tosoh Kabushikikaisha. In addition, the weight average molecular weight (Mw) was obtained as a polystyrene conversion value.

The measurement conditions are as follows.

Sample concentration: 0.2 wt% (THF solution)

Sample injection volume: 10μl eluent

THF flow rate: 0.6ml/min

Measurement temperature: 40℃

Sample column: TSKguardcolumn SuperHZ-H (1 pc) + TSKgel SuperHZM-H (2 pcs)

Reference column: TSKgel SuperH-RC (1 piece)

Detector: Differential refractometer (RI)

<Production of adhesive sheets>

The obtained pressure-sensitive adhesive composition was applied to the release-treated surface of a 38 µm thick polyester film (trade name: MRF, manufactured by Mitsubishi Chemical Corporation) whose single side was peeled with silicone, so that the thickness after drying with a fountain roll became 50 µm, and the film was cured and dried under the conditions of a drying temperature of 130°C and a drying time of 3 minutes. In this way, an adhesive layer was produced on a substrate. Subsequently, a 38 µm thick polyester film (trade name: MRF, manufactured by Mitsubishi Chemical Corporation) whose single side was peeled with silicone was covered on the surface of the adhesive layer so that the release-treated surface of the film became the adhesive layer side. In this way, an adhesive sheet was produced.

<Measurement of glass transition temperature (Tg), storage modulus, loss modulus, and tanδ (loss tangent)>

The dynamic viscoelasticity was measured using a dynamic viscoelasticity measuring device (ARES, manufactured by Rheometrics Inc.) using the following method.

From the obtained adhesive sheet, only the adhesive layer was taken out, laminated to a thickness of about 2 mm, and this was punched to φ 7.9 mm to produce a cylindrical pellet, which was used as a measurement sample. The measurement sample was fixed to a jig of a φ 7.9 mm parallel plate, and the temperature dependence of the storage elastic modulus G' and the loss elastic modulus G" was measured by the dynamic viscoelasticity measuring device, and tnaδ was calculated as tanδ = G" / G'. In addition, the temperature at which the obtained tanδ curve becomes a maximum was defined as the glass transition temperature (Tg) (℃).

The measurement conditions are as follows.

Measurement: Shear mode,

Temperature range: -70℃ to 150℃

Heating rate: 5℃/min

Frequency: 1Hz

〔Manufacturing Example 1〕: (Meth)acrylic polymer (1)

In a four-necked flask equipped with a stirring blade, a thermometer, a nitrogen gas introduction tube, and a condenser, 100 parts by weight of 2-ethylhexyl acrylate (manufactured by Nippon Shokubai Co., Ltd.), 4 parts by weight of 2-hydroxyethyl acrylate (manufactured by Toagosei Co., Ltd.), 0.2 parts by weight of 2,2'-azobisisobutyronitrile as a polymerization initiator (manufactured by Wako Pure Chemical Industries, Ltd.), and 156 parts by weight of ethyl acetate were charged, and while slowly stirring, nitrogen gas was introduced, and the liquid temperature inside the flask was maintained at around 65°C, and a polymerization reaction was performed for 6 hours, to prepare a solution (40 wt%) of a (meth)acrylic polymer (1) having a weight average molecular weight of 550,000.

〔Manufacturing Example 2〕: (Meth)acrylic polymer (2)

In a four-necked flask equipped with a stirring blade, a thermometer, a nitrogen gas introduction tube, and a condenser, 100 parts by weight of 2-ethylhexyl acrylate (manufactured by Nippon Shokubai Co., Ltd.), 10 parts by weight of 4-hydroxybutylacrylate (manufactured by Osaka Yuki Kagaku Kogyo Co., Ltd.), 0.02 parts by weight of acrylic acid (manufactured by Toagosei Co., Ltd.), 0.2 parts by weight of 2,2'-azobisisobutyronitrile as a polymerization initiator (manufactured by Wako Pure Chemical Industries, Ltd.), and 156 parts by weight of ethyl acetate were charged, and while slowly stirring, nitrogen gas was introduced, and the liquid temperature inside the flask was maintained at around 65°C, a polymerization reaction was performed for 6 hours, to prepare a solution (40% by weight) of a (meth)acrylic polymer (2) having a weight average molecular weight of 540,000.

〔Manufacturing Example 3〕: (Meth)acrylic polymer (3)

In a four-necked flask equipped with a stirring blade, a thermometer, a nitrogen gas introduction tube, and a condenser, 99 parts by weight of butylacrylate (manufactured by Nippon Shokubai Co., Ltd.), 1 part by weight of 4-hydroxybutylacrylate (manufactured by Osaka Yuki Kagaku Kogyo Co., Ltd.), 1 part by weight of 2,2'-azobisisobutyronitrile as a polymerization initiator (manufactured by Wako Pure Chemical Industries, Ltd.), and 156 parts by weight of ethyl acetate were charged, and while slowly stirring, nitrogen gas was introduced, and the liquid temperature inside the flask was maintained at around 60°C to perform a polymerization reaction for 7 hours, thereby preparing a solution (39 wt%) of a (meth)acrylic polymer (3) having a weight average molecular weight of 1,600,000.

〔Manufacturing Example 4〕: (Meth)acrylic polymer (4)

In a four-necked flask equipped with a stirring blade, a thermometer, a nitrogen gas introduction tube, and a condenser, 92 parts by weight of butylacrylate (manufactured by Nippon Shokubai Co., Ltd.), 5 parts by weight of N-acryloylmorpholine (manufactured by Kojin Co., Ltd.), 2.9 parts by weight of acrylic acid (manufactured by Toa Gosei Co., Ltd.), 0.1 part by weight of 2,2'-azobisisobutyronitrile as a polymerization initiator (manufactured by Wako Pure Chemical Industries, Ltd.), and 200 parts by weight of ethyl acetate were charged, and while slowly stirring, nitrogen gas was introduced, and the liquid temperature inside the flask was maintained at around 55°C, a polymerization reaction was performed for 8 hours, to prepare a solution (33 wt%) of a (meth)acrylic polymer (4) having a weight average molecular weight of 1,800,000.

〔Manufacturing Example 5〕: (Meth)acrylic polymer (5)

In a four-necked flask equipped with a stirring blade, a thermometer, a nitrogen gas introduction tube, and a condenser, 95 parts by weight of butylacrylate (manufactured by Nippon Shokubai Co., Ltd.), 5 parts by weight of acrylic acid (manufactured by Toagosei Co., Ltd.), 0.2 parts by weight of 2,2'-azobisisobutyronitrile as a polymerization initiator (manufactured by Wako Pure Chemical Industries, Ltd.), and 156 parts by weight of ethyl acetate were charged, and while slowly stirring, nitrogen gas was introduced, and the liquid temperature inside the flask was maintained at around 63°C, a polymerization reaction was performed for 10 hours, to prepare a solution (40 wt%) of a (meth)acrylic polymer (5) having a weight average molecular weight of 700,000.

〔Manufacturing Example 6〕: Alicyclic Structure-Containing (Meth)Acrylic Polymer (6)

As a monomer component, cyclohexyl methacrylate [glass transition temperature of homopolymer (poly cyclohexyl methacrylate): 66°C]: 95 parts by weight, acrylic acid: 5 parts by weight, 2-mercaptoethanol: 3 parts by weight as a chain transfer agent, 2,2'-azobisisobutyronitrile: 0.2 parts by weight as a polymerization initiator, and toluene: 103.2 parts by weight as a polymerization solvent were charged into a separable flask and stirred for 1 hour while introducing nitrogen gas. After removing oxygen in the polymerization system in this way, the temperature was increased to 70°C and reacted for 3 hours, and further reacted at 75°C for 2 hours to obtain a solution (50 wt%) of a (meth)acrylic polymer (6) having a weight average molecular weight of 4000.

〔Manufacturing Example 6〕: (Meth)acrylic polymer containing an alicyclic structure (7)

In a four-necked flask equipped with a stirring blade, a thermometer, a nitrogen gas introduction tube, a condenser, and a dropping funnel, toluene: 100 parts by weight, dicyclopentanyl methacrylate (DCPMA) (trade name: FA-513M, manufactured by Hitachi Kasei Kogyo Co., Ltd.): 60 parts by weight, methyl methacrylate (MMA): 40 parts by weight, and methyl thioglycolate: 3.5 parts by weight as a chain transfer agent were charged. Then, after stirring at 70°C for 1 hour under a nitrogen atmosphere, 2,2'-azobisisobutyronitrile: 0.2 parts by weight as a polymerization initiator was charged, and the mixture was reacted at 70°C for 2 hours, continuously reacted at 80°C for 4 hours, and then reacted at 90°C for 1 hour to obtain a solution (51 wt%) of a (meth)acrylic polymer (7) having a weight average molecular weight of 4000.

〔Example 1〕

A solution of (meth)acrylic polymer (1) was diluted with ethyl acetate so that the total solid content became 25 wt% based on 100 wt% of the solid content of the solution of (meth)acrylic polymer (1), and stirred with a disper to obtain an adhesive composition (1) including an acrylic resin. The results are shown in Table 1.

〔Example 2〕

To a solution of (meth)acrylic polymer (1), 0.01 part by weight of Coronate L (manufactured by Nippon Polyurethane Kogyo Co., Ltd.) as a crosslinking agent in terms of solid content and 0.005 part by weight of Ferric Nasem (manufactured by Nippon Kagaku Sangyo Co., Ltd.) as a crosslinking catalyst in terms of solid content were added based on 100 parts by weight of the solid content of the solution of (meth)acrylic polymer (1), the mixture was diluted with ethyl acetate so that the total solid content became 25% by weight, and stirred with a disper to obtain an adhesive composition (2) including an acrylic resin. The results are shown in Table 1.

〔Example 3〕

To a solution of (meth)acrylic polymer (1), 0.1 part by weight of Coronate L (manufactured by Nippon Polyurethane Industries, Ltd.) as a crosslinking agent in terms of solid content and 0.005 part by weight of Ferric Nasem (manufactured by Nippon Kagaku Sangyo Co., Ltd.) as a crosslinking catalyst in terms of solid content were added based on 100 parts by weight of the solid content of the solution of (meth)acrylic polymer (1), the mixture was diluted with ethyl acetate so that the total solid content became 25% by weight, and stirred with a disper to obtain an adhesive composition (3) including an acrylic resin. The results are shown in Table 1.

〔Example 4〕

To a solution of (meth)acrylic polymer (1), 0.05 parts by weight of Coronate L (manufactured by Nippon Polyurethane Industries, Ltd.) as a crosslinking agent (calculated in solid content) per 100 parts by weight of the solid content of the solution of (meth)acrylic polymer (1), 0.005 parts by weight of Ferric Nasem (manufactured by Nippon Kagaku Sangyo Co., Ltd.) as a crosslinking catalyst (calculated in solid content), and 5 parts by weight of a solution of (meth)acrylic polymer (6) were added, diluted with ethyl acetate so that the total solid content would be 25% by weight, and stirred with a disper, to obtain an adhesive composition (4) including an acrylic resin. The results are shown in Table 1.

〔Example 5〕

To a solution of (meth)acrylic polymer (1), 0.1 part by weight of Coronate L (manufactured by Nippon Polyurethane Industries, Ltd.) as a crosslinking agent (calculated in solid content) per 100 parts by weight of the solid content of the solution of (meth)acrylic polymer (1), 0.005 part by weight of Ferric Nasem (manufactured by Nippon Kagaku Sangyo Co., Ltd.) as a crosslinking catalyst (calculated in solid content), and 5 parts by weight of a solution of (meth)acrylic polymer (6) were added, and the mixture was diluted with ethyl acetate so that the total solid content became 25% by weight, and stirred with a disper to obtain an adhesive composition (5) including an acrylic resin. The results are shown in Table 1.

〔Example 6〕

To a solution of (meth)acrylic polymer (1), 0.3 parts by weight of Coronate L (manufactured by Nippon Polyurethane Industries, Ltd.) as a crosslinking agent (calculated in solid content) per 100 parts by weight of the solid content of the solution of (meth)acrylic polymer (1), 0.005 parts by weight of Ferric Nasem (manufactured by Nippon Kagaku Sangyo Co., Ltd.) as a crosslinking catalyst (calculated in solid content) and 5 parts by weight of a solution of (meth)acrylic polymer (6) were added, diluted with ethyl acetate so that the total solid content would be 25% by weight, and stirred with a disper to obtain an adhesive composition (6) including an acrylic resin. The results are shown in Table 1.

〔Example 7〕

To a solution of (meth)acrylic polymer (1), 0.1 part by weight of Coronate L (manufactured by Nippon Polyurethane Industries, Ltd.) as a crosslinking agent (calculated in solid content) per 100 parts by weight of the solid content of the solution of (meth)acrylic polymer (1), 0.005 part by weight of Ferric Nasem (manufactured by Nippon Kagaku Sangyo Co., Ltd.) as a crosslinking catalyst (calculated in solid content), and 5 parts by weight of a solution of (meth)acrylic polymer (7) were added, and the mixture was diluted with ethyl acetate so that the total solid content became 25% by weight, and stirred with a disper to obtain an adhesive composition (7) including an acrylic resin. The results are shown in Table 1.

〔Example 8〕

To a solution of (meth)acrylic polymer (1), 0.3 parts by weight of Coronate L (manufactured by Nippon Polyurethane Industries, Ltd.) as a crosslinking agent (calculated in solid content) per 100 parts by weight of the solid content of the solution of (meth)acrylic polymer (1), 0.005 parts by weight of Ferric Nasem (manufactured by Nippon Kagaku Sangyo Co., Ltd.) as a crosslinking catalyst (calculated in solid content), and 5 parts by weight of a solution of (meth)acrylic polymer (7) were added, diluted with ethyl acetate so that the total solid content would be 25% by weight, and stirred with a disper to obtain an adhesive composition (8) including an acrylic resin. The results are shown in Table 1.

〔Example 9〕

A solution of (meth)acrylic polymer (2) was diluted with ethyl acetate so that the total solid content became 25 wt% based on 100 wt% of the solid content of the solution of (meth)acrylic polymer (2), and stirred with a disper to obtain an adhesive composition (9) including an acrylic resin. The results are shown in Table 1.

〔Example 10〕

To a solution of (meth)acrylic polymer (2), 0.1 part by weight of Coronate L (manufactured by Nippon Polyurethane Industries, Ltd.) as a crosslinking agent in terms of solid content, 0.05 part by weight of TETRAD-C (manufactured by Mitsubishi Gas Chemical Co., Ltd.) in terms of solid content, and 0.005 part by weight of Ferric Nasem (manufactured by Nippon Kagaku Sangyo Co., Ltd.) in terms of solid content were added based on 100 parts by weight of the solid content of the solution of (meth)acrylic polymer (2), and the mixture was diluted with ethyl acetate so that the total solid content became 25% by weight, and stirred with a disper to obtain an adhesive composition (10) including an acrylic resin. The results are shown in Table 1.

〔Example 11〕

To a solution of (meth)acrylic polymer (3), 0.02 part by weight of Coronate L (manufactured by Nippon Polyurethane Kogyo Co., Ltd.) as a crosslinking agent in terms of solid content and 0.005 part by weight of Ferric Nasem (manufactured by Nippon Kagaku Sangyo Co., Ltd.) as a crosslinking catalyst in terms of solid content were added based on 100 parts by weight of the solid content of the solution of (meth)acrylic polymer (3), the mixture was diluted with ethyl acetate so that the total solid content became 25% by weight, and stirred with a disper to obtain an adhesive composition (11) including an acrylic resin. The results are shown in Table 1.

〔Example 12〕

To a solution of (meth)acrylic polymer (4), 0.3 part by weight of Coronate L (manufactured by Nippon Polyurethane Kogyo Co., Ltd.) as a crosslinking agent in terms of solid content and 0.005 part by weight of Ferric Nasem (manufactured by Nippon Kagaku Sangyo Co., Ltd.) as a crosslinking catalyst in terms of solid content were added based on 100 parts by weight of the solid content of the solution of (meth)acrylic polymer (4), the mixture was diluted with ethyl acetate so that the total solid content became 25% by weight, and stirred with a disper to obtain an adhesive composition (12) including an acrylic resin. The results are shown in Table 1.

〔Example 13〕

To a solution of (meth)acrylic polymer (5), 0.075 parts by weight of TETRAD-C (manufactured by Mitsubishi Gas Chemical Co., Ltd.) as a crosslinking agent in terms of solid content and 0.005 parts by weight of ferric Nasem (manufactured by Nippon Kagaku Sangyo Co., Ltd.) as a crosslinking catalyst in terms of solid content were added based on 100 parts by weight of the solid content of the solution of (meth)acrylic polymer (5), the mixture was diluted with ethyl acetate so that the total solid content became 25% by weight, and stirred with a disper to obtain an adhesive composition (13) including an acrylic resin. The results are shown in Table 1.

〔Example 14〕

To a solution of (meth)acrylic polymer (5), 0.075 parts by weight of TETRAD-C (manufactured by Mitsubishi Gas Chemical Co., Ltd.) as a crosslinking agent (in terms of solid content) per 100 parts by weight of the solid content of the solution of (meth)acrylic polymer (5), 0.005 parts by weight of ferric nasem (manufactured by Nippon Kagaku Sangyo Co., Ltd.) as a crosslinking catalyst (in terms of solid content), and 20 parts by weight of a solution of (meth)acrylic polymer (6) were added, diluted with ethyl acetate so that the total solid content would be 25% by weight, and stirred with a disper, thereby obtaining an adhesive composition (14) including an acrylic resin. The results are shown in Table 1.

〔Comparative Example 1〕

To a solution of (meth)acrylic polymer (1), 0.5 part by weight of Coronate L (manufactured by Nippon Polyurethane Industries, Ltd.) as a crosslinking agent in terms of solid content and 0.005 part by weight of Ferric Nasem (manufactured by Nippon Kagaku Sangyo Co., Ltd.) as a crosslinking catalyst in terms of solid content were added based on 100 parts by weight of the solid content of the solution of (meth)acrylic polymer (1), the mixture was diluted with ethyl acetate so that the total solid content became 25% by weight, and stirred with a disper to obtain an adhesive composition (C1) including an acrylic resin. The results are shown in Table 1.

〔Comparative Example 2〕

To a solution of (meth)acrylic polymer (2), 0.45 parts by weight of Coronate L (manufactured by Nippon Polyurethane Industries, Ltd.) as a crosslinking agent in terms of solid content, 0.3 parts by weight of TETRAD-C (manufactured by Mitsubishi Gas Chemical Co., Ltd.) in terms of solid content, and 0.005 parts by weight of Ferric Nasem (manufactured by Nippon Kagaku Sangyo Co., Ltd.) in terms of solid content were added per 100 parts by weight of the solid content of the solution of (meth)acrylic polymer (2), and the mixture was diluted with ethyl acetate so that the total solid content would be 25% by weight, and stirred with a disper to obtain an adhesive composition (C2) including an acrylic resin. The results are shown in Table 1.

〔Example 15〕

A polyester film was peeled from one side of an adhesive sheet obtained from the adhesive composition (1) obtained in Example 1, and adhered to a polarizing plate (manufactured by Nitto Denko Co., Ltd., product name “TEG1465DUHC”), which is an optical member, to obtain an optical member to which the adhesive sheet was adhered.

〔Example 16〕

A polyester film was peeled from one side of an adhesive sheet obtained from the adhesive composition (2) obtained in Example 2, and adhered to a polarizing plate (manufactured by Nitto Denko Co., Ltd., product name “TEG1465DUHC”), which is an optical member, to obtain an optical member to which the adhesive sheet was adhered.

〔Example 17〕

A polyester film was peeled from one side of an adhesive sheet obtained from the adhesive composition (4) obtained in Example 4, and adhered to a polarizing plate (manufactured by Nitto Denko Co., Ltd., trade name “TEG1465DUHC”), which is an optical member, to obtain an optical member to which the adhesive sheet was adhered.

〔Example 18〕

A polyester film was peeled from one side of an adhesive sheet obtained from the adhesive composition (7) obtained in Example 7, and adhered to a polarizing plate (manufactured by Nitto Denko Co., Ltd., product name “TEG1465DUHC”), which is an optical member, to obtain an optical member to which the adhesive sheet was adhered.

〔Example 19〕

A polyester film was peeled from one side of an adhesive sheet obtained from the adhesive composition (9) obtained in Example 9, and adhered to a polarizing plate (manufactured by Nitto Denko Co., Ltd., product name “TEG1465DUHC”), which is an optical member, to obtain an optical member to which the adhesive sheet was adhered.

〔Example 20〕

A polyester film was peeled from one side of an adhesive sheet obtained from the adhesive composition (10) obtained in Example 10, and adhered to a polarizing plate (manufactured by Nitto Denko Co., Ltd., trade name “TEG1465DUHC”), which is an optical member, to obtain an optical member to which the adhesive sheet was adhered.

〔Example 21〕

A polyester film was peeled from one side of an adhesive sheet obtained from the adhesive composition (11) obtained in Example 11, and adhered to a polarizing plate (manufactured by Nitto Denko Co., Ltd., product name “TEG1465DUHC”), which is an optical member, to obtain an optical member to which the adhesive sheet was adhered.

〔Example 22〕

A polyester film was peeled from one side of an adhesive sheet obtained from the adhesive composition (12) obtained in Example 12, and adhered to a polarizing plate (manufactured by Nitto Denko Co., Ltd., trade name “TEG1465DUHC”), which is an optical member, to obtain an optical member to which the adhesive sheet was adhered.

〔Example 23〕

A polyester film was peeled from one side of an adhesive sheet obtained from the adhesive composition (13) obtained in Example 13, and adhered to a polarizing plate (manufactured by Nitto Denko Co., Ltd., trade name “TEG1465DUHC”), which is an optical member, to obtain an optical member to which the adhesive sheet was adhered.

〔Example 24〕

A polyester film was peeled from one side of an adhesive sheet obtained from the adhesive composition (14) obtained in Example 14, and adhered to a polarizing plate (manufactured by Nitto Denko Co., Ltd., product name “TEG1465DUHC”), which is an optical member, to obtain an optical member to which the adhesive sheet was adhered.

〔Example 25〕

A polyester film was peeled from one side of an adhesive sheet obtained from the adhesive composition (1) obtained in Example 1, and adhered to a conductive film (manufactured by Nitto Denko Co., Ltd., trade name “Elecrista V270L-TFMP”), which is an electronic member, to obtain an electronic member to which the adhesive sheet was adhered.

〔Example 26〕

A polyester film was peeled from one side of an adhesive sheet obtained from the adhesive composition (2) obtained in Example 2, and adhered to a conductive film (manufactured by Nitto Denko Co., Ltd., trade name “Elecrista V270L-TFMP”), which is an electronic member, to obtain an electronic member to which the adhesive sheet was adhered.

〔Example 27〕

A polyester film was peeled from one side of an adhesive sheet obtained from the adhesive composition (4) obtained in Example 4, and adhered to a conductive film (manufactured by Nitto Denko Co., Ltd., trade name “Elecrista V270L-TFMP”), which is an electronic member, to obtain an electronic member to which the adhesive sheet was adhered.

〔Example 28〕

A polyester film was peeled from one side of an adhesive sheet obtained from the adhesive composition (7) obtained in Example 7, and adhered to a conductive film (manufactured by Nitto Denko Co., Ltd., trade name “Elecrista V270L-TFMP”), which is an electronic member, to obtain an electronic member to which the adhesive sheet was adhered.

〔Example 29〕

A polyester film was peeled from one side of an adhesive sheet obtained from the adhesive composition (9) obtained in Example 9, and adhered to a conductive film (manufactured by Nitto Denko Co., Ltd., trade name “Elecrista V270L-TFMP”), which is an electronic member, to obtain an electronic member to which the adhesive sheet was adhered.

〔Example 30〕

A polyester film was peeled from one side of an adhesive sheet obtained from the adhesive composition (10) obtained in Example 10, and adhered to a conductive film (manufactured by Nitto Denko Co., Ltd., trade name “Elecrista V270L-TFMP”), which is an electronic member, to obtain an electronic member to which the adhesive sheet was adhered.

〔Example 31〕

A polyester film was peeled from one side of an adhesive sheet obtained from the adhesive composition (11) obtained in Example 11, and adhered to a conductive film (manufactured by Nitto Denko Co., Ltd., trade name “Elecrista V270L-TFMP”), which is an electronic member, to obtain an electronic member to which the adhesive sheet was adhered.

〔Example 32〕

A polyester film was peeled from one side of an adhesive sheet obtained from the adhesive composition (12) obtained in Example 12, and adhered to a conductive film (manufactured by Nitto Denko Co., Ltd., trade name “Elecrista V270L-TFMP”), which is an electronic member, to obtain an electronic member to which the adhesive sheet was adhered.

〔Example 33〕

A polyester film was peeled from one side of an adhesive sheet obtained from the adhesive composition (13) obtained in Example 13, and adhered to a conductive film (manufactured by Nitto Denko Co., Ltd., trade name “Elecrista V270L-TFMP”), which is an electronic member, to obtain an electronic member to which the adhesive sheet was adhered.

〔Example 34〕

A polyester film was peeled from one side of an adhesive sheet obtained from the adhesive composition (14) obtained in Example 14, and adhered to a conductive film (manufactured by Nitto Denko Co., Ltd., trade name “Elecrista V270L-TFMP”), which is an electronic member, to obtain an electronic member to which the adhesive sheet was adhered.

An adhesive member having an adhesive layer formed from the adhesive composition of the present invention can be suitably used as a protective material for the purpose of protecting, for example, an optical member or an electronic member from external impact.

10: Description
20: Adhesive layer
30: Separator
100: Absence of adhesive

Claims (9)

An adhesive composition comprising a polymer (A) having a monomer unit derived from (meth)acrylic acid alkyl ester,
The content ratio of the polymer (A) in the adhesive composition is 80 to 100 wt%,
The above (meth)acrylic acid alkyl ester-derived monomer unit is a (meth)acrylic acid alkyl ester-derived monomer unit (I) having an alkyl group having 1 to 20 carbon atoms as an alkyl ester moiety,
The above polymer (A) has a monomer unit derived from (meth)acrylic acid ester having an OH group in the molecule,
Containing a bifunctional or higher organic polyisocyanate crosslinking agent and/or an epoxy crosslinking agent,
- The loss tangent tanδ of the adhesive layer formed by the adhesive composition is 0.10 or more in the entire temperature range of -40℃ to 150℃.
Adhesive composition. An adhesive member having an adhesive layer formed from the adhesive composition described in claim 1. An optical member comprising the adhesive member described in claim 2. An electronic component having the adhesive component described in claim 2. delete delete delete delete delete

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