KR101888341B1 - Stress distributing film, optical member, and electronic member - Google Patents

Abstract

Disclosed is a stress distribution film having excellent stress dispersibility. An optical member and an electronic member provided with such a stress-dispersive film are also provided. The stress-dispersion film of the present invention is a stress-dispersion film comprising a laminate of a plastic film and a pressure-sensitive adhesive layer, and the press-in energy when a load is applied to the laminate from the plastic film side of the laminate in a direction perpendicular thereto is not less than 260 μJ .

Description

STRESS DISTRIBUTING FILM, OPTICAL MEMBER, AND ELECTRONIC MEMBER}

TECHNICAL FIELD The present invention relates to a stress dispersion film, an optical member having the stress dispersion film, and an electronic member.

In order to impart rigidity and impact resistance to an optical member or an electronic member such as a touch panel using an LCD, a lens unit of a camera, and electronic equipment, an adhesive film may be adhered to the exposed surface side (see, for example, One). Such a pressure-sensitive adhesive film usually has a base layer and a pressure-sensitive adhesive layer.

Such an optical member or an electronic member may be subjected to a load due to pressure input in various situations such as during assembly, processing, transportation, and use, and the optical member and the electron member are damaged by such a load A problem arises.

Japanese Patent Application Laid-Open No. 2014-234460

A problem of the present invention is to provide a stress dispersive film having excellent stress dispersibility. Another object of the present invention is to provide an optical member and an electronic member provided with such a stress dispersion film.

The stress-dispersive film of the present invention,

A stress-dispersion film comprising a laminate of a plastic film and a pressure-sensitive adhesive layer,

The indentation energy when a load is applied in the direction perpendicular to the stacked body from the plastic film side of the stacked body is 260 占 이상 or more.

In one embodiment, the plastic film has a thickness of 4 탆 to 500 탆.

In one embodiment, the thickness of the pressure-sensitive adhesive layer is 1 m to 300 m.

In one embodiment, the pressure-sensitive adhesive layer is formed of a pressure-sensitive adhesive composition, and the pressure-sensitive adhesive composition comprises a monomer unit (I) derived from a (meth) acrylic acid alkyl ester having an alkyl group of 1 to 20 carbon atoms as an alkyl ester portion, (A) having a monomer unit (II) derived from a (meth) acrylate ester having a COOH group and / or a COOH group.

In one embodiment, the molar content ratio of the NCO groups in the pressure-sensitive adhesive composition is set to [NCO], the molar content ratio of the epoxy group in the pressure-sensitive adhesive composition is set to [epoxy] ([OH] + [COOH]) < 0.05 when the molar ratio of the COOH group in the pressure-sensitive adhesive composition is [COOH].

In one embodiment, the pressure-sensitive adhesive composition includes an organic polyisocyanate-based crosslinking agent and / or an epoxy-based crosslinking agent having two or more functional groups.

In one embodiment, the pressure-sensitive adhesive composition includes a polymer (B) having a weight average molecular weight of 1,000 or more and less than 30,000, having a monomer unit derived from a (meth) acrylate ester having an alicyclic structure represented by the formula (1).

CH ₂ = C (R ¹ ) COOR ² ... (One)

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

In one embodiment, the loss tangent tan? Of the pressure-sensitive adhesive layer in the entire temperature range of -40 占 폚 to 150 占 폚 is 0.10 or more.

The optical member of the present invention comprises the stress-dispersion film.

The electronic member of the present invention comprises the stress-dispersion film.

According to the present invention, it is possible to provide a stress dispersive film having excellent stress dispersibility. Further, it is possible to provide an optical member and an electronic member provided with such a stress dispersion film.

1 is a schematic sectional view of a stress dispersion film according to one embodiment of the present invention.
2 is a schematic cross-sectional view of a stress dispersion film according to another embodiment of the present invention.

In the present specification, the term "(meth) acrylic" means "acrylic and / or methacrylic", and when there is a term "(meth) acrylate", "acrylate and / Quot; rate &quot;. In the present specification, when there is the expression &quot; weight &quot;, it may be replaced with &quot; mass &quot;

In the present specification, when the term "(a) derived monomer unit (A)" is present, the monomer unit (A) is a structural unit formed by cleavage of the unsaturated double bond of the monomer (a) by polymerization. The structural unit in which the unsaturated double bond is formed by cleavage by polymerization means an unsaturated double bond of the structure &quot; RpRqC = CRrRs &quot; (Rp, Rq, Rr and Rs represent any suitable group bonded to the carbon atom by a single bond) Is a structural unit of "-RpRqC-CRrRs-" in which the bond "C = C" is formed by cleavage by polymerization.

In the present specification, the content ratio of the monomer unit in the polymer can be found, for example, by various structural analyzes (for example, NMR, etc.) of the polymer. The content ratio of the monomer units derived from various monomers calculated on the basis of the amounts of the various monomers used in the production of the polymer may be the content ratio of the monomer units in the polymer. That is, the content ratio of a certain monomer (m) in the total monomer components used in the production of the polymer may be treated as the content ratio of the monomer units derived from the monomer (m) in the polymer.

«A. Stress Dispersive Film »»

The stress dispersion film of the present invention includes a laminate of a plastic film and a pressure-sensitive adhesive layer. The plastic film may be a single layer or two or more layers. The pressure-sensitive adhesive layer may be a single layer or two or more layers.

1 is a schematic cross-sectional view of a stress dispersion film according to one embodiment of the present invention. 1, the stress dispersion film 100 of the present invention is formed of a laminate of a plastic film 10 and a pressure-sensitive adhesive layer 20. Although not shown in Fig. 1, any suitable strong adhesive layer may be provided on the surface of the pressure-sensitive adhesive layer 20. [

2 is a schematic cross-sectional view of a stress dispersion film according to another embodiment of the present invention. 2, the stress dispersive film 100 of the present invention comprises a pressure-sensitive adhesive layer 20, a plastic film 10, and a pressure-sensitive adhesive layer 20. The pressure-sensitive adhesive layer 20, the plastic film 10, (20) in this order. 2, the stress dispersive film 100 of the present invention is composed of a laminate of a pressure-sensitive adhesive layer 20, a plastic film 10 and a pressure-sensitive adhesive layer 20. Although not shown in Fig. 2, any appropriate strong adhesive layer may be provided on the surface of the pressure-sensitive adhesive layer 20 on one side or both sides.

In the case where the pressure-sensitive adhesive layer is exposed as the outermost layer, any suitable separator (release sheet) may be provided on the exposed surface side.

The stress dispersion film of the present invention has a push-in energy of 260 占 J or more when a load is applied in the direction perpendicular to the laminate from the plastic film side of the laminate of the plastic film and the pressure-sensitive adhesive layer. A method of measuring the above-mentioned indentation energy will be described later. The indentation energy is preferably from 260 μJ to 10000 μJ, more preferably from 270 μJ to 9000 μJ, still more preferably from 280 μJ to 8000 μJ, particularly preferably from 290 μJ to 7000 μJ. When the above-mentioned indentation energy is within the above range, it is possible to provide a stress dispersion film having excellent stress dispersibility.

The thickness of the plastic film is preferably 4 占 퐉 to 500 占 퐉, more preferably 10 占 퐉 to 400 占 퐉, still more preferably 15 占 퐉 to 350 占 퐉, and particularly preferably 20 占 퐉 to 300 占 퐉. When the thickness of the plastic film is within the above-mentioned range, it is possible to provide a stress-dispersion film having more excellent stress dispersibility.

The thickness of the pressure-sensitive adhesive layer is preferably 1 m to 300 m, more preferably 2 m to 250 m, further preferably 4 m to 200 m, and particularly preferably 5 m to 150 m. When the thickness of the pressure-sensitive adhesive layer is within the above-mentioned range, it is possible to provide a stress-dispersion film having more excellent stress dispersibility.

As the plastic film, any suitable plastic film can be employed as long as the effect of the present invention is not impaired. These plastic films are, for example, its compressive strength in ASTM D695, preferably 100Kg / cm ² to about 3000Kg / cm ^2, preferably in the 200Kg / cm ² to about 2900Kg / cm ² more, and more preferably Cm ² to 2800 kg / cm ² , particularly preferably 400 kg / cm ² to 2700 kg / cm ² . Specific examples of such plastic films include polyester resins, polyolefin resins, polyamide resins, polyimide resins, and the like. Examples of the polyester-based resin include polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate. Examples of the polyolefin-based resin include homopolymers of olefin monomers and copolymers of olefin monomers. Specific examples of the polyolefin-based resin include homopolypropylene; Propylene-based copolymers such as a block system, a random system and a graft system having an ethylene component as a copolymerization component; Reactor TPO; Ethylene polymers such as low density, high density, linear low density and ultra low density; Ethylene / propylene copolymer, ethylene / vinyl acetate copolymer, ethylene / methyl acrylate copolymer, ethylene · ethyl acrylate copolymer, ethylene · butyl acrylate copolymer, ethylene · methacrylic acid copolymer, ethylene · methyl methacrylate copolymer And the like; And the like.

The plastic film may contain any suitable additives as required. Examples of additives that can be contained in the plastic film include antioxidants, ultraviolet absorbers, light stabilizers, antistatic agents, fillers, pigments and the like. The kind, quantity, and amount of additives that can be contained in the plastic film may be appropriately set according to the purpose.

As the pressure-sensitive adhesive layer, any appropriate pressure-sensitive adhesive layer can be employed as long as the effect of the present invention is not impaired. Examples of such a pressure-sensitive adhesive layer include a pressure-sensitive adhesive layer formed of an acrylic pressure-sensitive adhesive, a pressure-sensitive adhesive layer formed of a rubber-based pressure-sensitive adhesive, a pressure-sensitive adhesive layer formed of a silicone-based pressure-sensitive adhesive, and a pressure-sensitive adhesive layer formed of a urethane-

The pressure-sensitive adhesive layer is preferably formed of a pressure-sensitive adhesive composition.

As the pressure-sensitive adhesive layer, for example, a pressure-sensitive adhesive composition is applied on any suitable substrate and dried as necessary to form a pressure-sensitive adhesive layer on the substrate. Thereafter, the substrate is peeled off to obtain a pressure-sensitive adhesive layer. Further, for example, the pressure-sensitive adhesive composition may be coated on any appropriate plastic film, and if necessary, dried to form a pressure-sensitive adhesive layer on the plastic film, leaving the plastic film as it is, A dispersion film is obtained. Further, for example, a pressure-sensitive adhesive layer may be formed by applying a pressure-sensitive adhesive composition on any suitable substrate, drying it if necessary, forming a pressure-sensitive adhesive layer on the substrate, A stress dispersing film containing a film is obtained. Further, for example, a pressure-sensitive adhesive composition may be coated on any suitable substrate and dried as required to form a pressure-sensitive adhesive layer on the substrate, and the pressure-sensitive adhesive layer formed on the substrate is transferred to a plastic film, Is obtained.

Examples of the application method of the pressure-sensitive adhesive composition include roll coats, gravure coats, reverse coats, roll brushes, spray coats, air knife coatings, extrusion coats with die coaters and the like.

Such a pressure-sensitive adhesive composition preferably comprises a monomer unit (I) derived from a (meth) acrylic acid alkyl ester having an alkyl group of 1 to 20 carbon atoms as an alkyl ester moiety and a (meth) acrylic acid ester derived from a (meth) acrylate having an OH group and / Of the polymer (A) having the monomer unit (II).

The content of the polymer (A) in the pressure-sensitive adhesive composition is preferably 80% by weight to 100% by weight, more preferably 85% by weight to 100% by weight, still more preferably 90% by weight to 100% , Particularly preferably 92.5% by weight to 100% by weight, and most preferably 95% by weight to 100% by weight. When the content of the polymer (A) in the pressure-sensitive adhesive composition is within the above range, it is possible to provide a stress-dispersion film having more excellent stress dispersibility.

The polymer (A) has a monomer unit (I) derived from a (meth) acrylic acid alkyl ester having an alkyl group having from 1 to 20 carbon atoms as an alkyl ester moiety. The monomer unit (I) derived from the (meth) acrylic acid alkyl ester having an alkyl group having from 1 to 20 carbon atoms as the alkyl ester portion in the polymer (A) may be either one type alone or two or more types.

The content of the monomer unit (I) derived from the (meth) acrylic acid alkyl ester having an alkyl group of 1 to 20 carbon atoms as the alkyl ester portion in the polymer (A) is preferably 90% by weight to 99.5% by weight, By weight, more preferably 92% by weight to 98.5% by weight, particularly preferably 93% by weight to 98.2% by weight, and most preferably 94% by weight to 98% by weight. When the content ratio of the monomer unit (I) derived from the (meth) acrylic acid alkyl ester having an alkyl group having from 1 to 20 carbon atoms in the polymer (A) is within the above range, the stress dispersion A film can be provided.

Examples of the (meth) acrylic acid alkyl ester having an alkyl group of 1 to 20 carbon atoms as an alkyl ester portion include methyl (meth) acrylate, ethyl (meth) acrylate, n- butyl (meth) acrylate, (Meth) acrylate, isobutyl (meth) acrylate, hexyl (meth) acrylate, 2-ethylhexyl (meth) (Meth) acrylate, n-decyl (meth) acrylate, n-nonyl (meth) acrylate, isononyl (meth) n-tridecyl (meth) acrylate, and n-tetradecyl (meth) acrylate.

The polymer (A) has a monomer unit (II) derived from a (meth) acrylate ester having an OH group and / or a COOH group in the molecule. The monomer unit (II) derived from the (meth) acrylate ester having an OH group and / or a COOH group in the molecule in the polymer (A) may be either one kind alone or two or more kinds. The polymer (A) has a monomer unit (II) derived from a (meth) acrylate ester having an OH group and / or a COOH group in the molecule, thereby providing a stress dispersive film having more excellent stress dispersibility.

The content of the monomer unit (II) derived from the (meth) acrylate ester having an OH group and / or a COOH group in the molecule in the polymer (A) is preferably 0.5% by weight to 10% by weight, more preferably 1% By weight, more preferably from 1.5% by weight to 8% by weight, particularly preferably from 1.8% by weight to 7% by weight, and most preferably from 2% by weight to 6% by weight. The content of the monomer unit (II) derived from the (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, thereby providing a stress-dispersive film having more excellent stress- can do.

Examples of the (meth) acrylic esters having an OH group in the molecule include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) (Meth) acrylate, 2-hydroxybutyl (meth) acrylate, hydroxyhexyl (meth) acrylate, 8-hydroxyoctyl Hexyl) methyl acrylate, N-methylol (meth) acrylamide, vinyl alcohol, allyl alcohol, 2-hydroxyethyl vinyl ether, 4-hydroxybutyl vinyl ether and diethylene glycol monovinyl ether.

Examples of the (meth) acrylic esters having COOH groups in the molecule include (meth) acrylic acid, carboxyethyl (meth) acrylate, carboxypentyl (meth) acrylate, itaconic acid, maleic acid, fumaric acid, And the like.

The polymer (A) may have another monomer-derived monomer unit (III). The monomer unit (III) derived from the other monomers in the polymer (A) may be one kind or two or more kinds.

As other monomers, there can be mentioned, for example, monomers containing a cyano group, 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- , Sulfonic group-containing monomers, phosphoric acid group-containing monomers, and acid anhydride group-containing monomers.

The pressure-sensitive adhesive composition is characterized in that the molar content ratio of NCO groups in the pressure-sensitive adhesive composition is defined as [NCO], the molar content ratio of epoxy groups in the pressure-sensitive adhesive composition is [epoxy], and the molar proportion of OH groups in the pressure- ([NCO] + [epoxy]) / (OH) + [COOH] <0.05, where [COOH] represents the molar content of the COOH group in the pressure-sensitive adhesive composition. ([NCO] + [epoxy]) / ([OH] + [COOH]) falls within the above range, it is possible to provide a stress dispersion film having more excellent stress dispersibility. [NCO] = 0 when no NCO group is present in the pressure-sensitive adhesive composition, and [epoxy] = 0 when no epoxy group is present in the pressure-sensitive adhesive composition. That is, the lower limit of ([NCO] + [epoxy]) / ([OH] + [COOH]) is zero.

The pressure-sensitive adhesive composition preferably contains an organic polyisocyanate-based crosslinking agent and / or an epoxy-based crosslinking agent. The bifunctional or higher functional polyisocyanate crosslinking agent and / or epoxy crosslinking agent that may be contained in the pressure-sensitive adhesive composition of the present invention may be one kind or two or more kinds.

The total content of the bifunctional or higher functional polyisocyanate crosslinking agent and the epoxy crosslinking agent in the pressure-sensitive adhesive composition is preferably 0.001 part by mass to 0.4 part by mass, more preferably 0.0025 part by mass (based on 100 parts by mass of the polymer (A) 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. When the total content of the bifunctional or higher functional polyisocyanate crosslinking agent and the epoxy crosslinking agent in the pressure-sensitive adhesive composition of the present invention is within the above range with respect to 100 parts by weight of the polymer (A), a stress- .

Examples of the bifunctional or higher organic polyisocyanate crosslinking agent include lower aliphatic polyisocyanates such as butylene diisocyanate and hexamethylene diisocyanate; Cycloaliphatic 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; Trimethylolpropane / tolylene diisocyanate trimer adduct (for example, trade name "Coronate L" manufactured by Nippon Polyurethane Industry Co., Ltd.), trimethylolpropane / hexamethylene diisocyanate trimer adduct (for example, Isocyanurate adducts of hexamethylene diisocyanate (e.g., trade name &quot; Coronate HX &quot;, manufactured by Nippon Polyurethane Industry Co., Ltd.); And the like.

Examples of the epoxy cross-linking agent include bisphenol A, epichlorohydrin type epoxy resin, ethylene glycidyl ether, polyethylene glycol diglycidyl ether, glycerin diglycidyl ether, glycerin triglycidyl ether, Hexanediol glycidyl ether, trimethylolpropane triglycidyl ether, diglycidyl aniline, diamine glycidyl amine, N, N, N ', N'-tetraglycidyl-m-xylenediamine (Trade name: TETRAD-X manufactured by Mitsubishi Gas Chemical Company, trade name: TETRAD-X), 1,3-bis (N, N-diglycidylaminomethyl) cyclohexane (manufactured by Mitsubishi Gas Chemical Company, &Quot; TETRAD-C &quot;).

The pressure-sensitive adhesive composition may include a polymer (B) having a monomer unit derived from a (meth) acrylic acid ester containing an alicyclic structure represented by the formula (1) and having a weight average molecular weight of 1,000 to less than 30,000.

CH ₂ = C (R ¹ ) COOR ² ... (One)

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

The polymer (B) may be only one kind, or two or more kinds.

The weight average molecular weight of the polymer (B) is preferably 1000 to 30000, more preferably 1250 to 25000, still more preferably 1500 to 20,000, 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, it is possible to provide a stress-dispersive film having more excellent stress dispersibility even when the amount of the crosslinking agent is increased.

The content of the polymer (B) in the pressure-sensitive adhesive composition is preferably 0.5 to 50 parts by weight, more preferably 1 to 45 parts by weight, per 100 parts by weight of the polymer (A) 2 parts by weight to 40 parts by weight, particularly preferably 3 parts by weight to 35 parts by weight, and most preferably 4 parts by weight to 30 parts by weight. When the content of the polymer (B) in the pressure-sensitive adhesive composition is within the above range with respect to 100 parts by weight of the polymer (A), a stress-dispersive film having more excellent stress dispersibility can be provided even when the amount of the crosslinking agent is increased.

The content of the monomer unit derived from the (meth) acrylic ester containing an alicyclic structure represented by the formula (1) in the polymer (B) is preferably 40% by weight to 99.5% by weight, more preferably 42.5% by weight, To 99% by weight, more preferably 45% by weight to 98.5% by weight, particularly preferably 47.5% by weight to 98% by weight, and most preferably 50% by weight to 97.5% by weight. When the content ratio of the monomer unit derived from the (meth) acrylic acid ester containing an alicyclic structure represented by the formula (1) in the polymer (B) is within the above range, even when the amount of the crosslinking agent is increased, A stress dispersion film can be provided.

Examples of the (meth) acrylic acid ester having an alicyclic structure represented by the above formula (1) include cyclohexyl (meth) acrylate, dicyclopentanyl (meth) acrylate, dicyclopentanyloxyethyl methacrylate, Adamantyl methacrylate, 2-methyl-2-adamantyl methacrylate, 2-adamantyl methacrylate, 2-methyl-2-adamantyl methacrylate, -Methyl-2-adamantyl acrylate, 2-ethyl-2-adamantyl methacrylate and 2-ethyl-2-adamantyl acrylate.

The polymer (B) may have another monomer-derived monomer unit (IV). The monomer units (IV) derived from other monomers in the polymer (B) may be either one type alone or two or more types.

Examples of other monomers that may be contained in the polymer (B) include methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, (Meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, n-butyl (meth) acrylate, (Meth) acrylate, n-decyl (meth) acrylate, n-decyl (meth) acrylate, isononyl Acrylate, n-tetradecyl (meth) acrylate, acrylic acid, methacrylic acid, carboxyethyl acrylate, carboxypentyl acrylate, itaconic acid, maleic acid, fumaric acid, crotonic acid and isocrotonic acid.

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

Examples of the solution polymerization method include a method of dissolving a monomer component or a polymerization initiator in a solvent and heating to polymerize to obtain a polymer solution.

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

As the solvent to be used for the solution polymerization, any appropriate solvent may be used as long as the effect of the present invention is not impaired. Examples of such a solvent 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 the like. The solvent may be one kind or two or more kinds.

In the production of the polymer (A) and the polymer (B), a polymerization initiator can be used. These polymerization initiators may be used alone or in combination of two or more. Examples of such a polymerization initiator include azo compounds such as 2,2'-azobisisobutyronitrile, 2,2'-azobis (2-amidinopropane) dihydrochloride, 2,2'-azobis [2- (2-methyl-2-imidazolin-2-yl) propane] dihydrochloride, 2,2'-azobis Azo initiators such as 2,2'-azobis [N- (2-carboxyethyl) -2-methylpropionamidine] hydrate (Wako Pure Chemical Industries, VA-057); Persulfates such as potassium persulfate and ammonium persulfate; Di (4-t-butylcyclohexyl) peroxydicarbonate, di-sec-butylperoxydicarbonate, t-butylperoxyneodecanoate, t-butylperoxy pivalate, di-lauroyl peroxide, di-n-octanoyl peroxide, 1,1,3,3-tetramethylbutylperoxy-2-ethylhexa Butyl peroxy isobutyrate, 1,1-di (t-hexyl peroxy) cyclohexane, t-butyl hydroperoxide, hydrogen peroxide, etc. Peroxide initiator; Redox initiators in combination with peroxides and reducing agents, such as a combination of persulfate and sodium hydrogen sulfite, a combination of peroxide and sodium ascorbate; And the like.

The amount of the polymerization initiator to be used may be any appropriate amount as long as the effect of the present invention is not impaired. The amount to be used is, for example, preferably 0.01 to 5 parts by weight based on 100 parts by weight of the monomer component.

In the production of the polymer (A) and the polymer (B), a chain transfer agent can be used. These chain transfer agents may be one kind or two or more kinds. Examples of such a chain transfer agent include lauryl mercaptan, glycidyl mercaptan, mercaptoacetic acid, 2-mercaptoethanol, thioglycolic acid, methyl thioglycolate, 2-ethylhexyl thioglycolate, 1-propanol, and the like.

The amount of the chain transfer agent to be used may be any appropriate amount as long as the effect of the present invention is not impaired. The amount to be used is, for example, preferably 0.01 to 5 parts by weight based on 100 parts by weight of the monomer component.

In the production of the polymer (A) and the polymer (B), any other suitable additives generally usable for the polymerization reaction can be used.

The pressure-sensitive adhesive composition of the present invention may contain a crosslinking catalyst. As the crosslinking catalyst, any appropriate crosslinking catalyst may be employed within the range not to impair the effect of the present invention. Examples of such a cross-linking catalyst include metal-based cross-linking catalysts such as tetra-n-butyl titanate, tetraisopropyl titanate, ferric silicic acid, . The crosslinking catalyst may be one kind or two or more kinds.

The amount of the crosslinking catalyst to be used may be any appropriate amount as long as the effect of the present invention is not impaired. The amount to be used is preferably 0.001 part by weight to 0.05 part by weight, for example, based on 100 parts by weight of the monomer component.

The pressure-sensitive adhesive composition may contain any other suitable additives insofar as the effect of the present invention is not impaired. Examples of such other additives include powders such as silane coupling agents, crosslinking retarders, emulsifiers, colorants and pigments, dyes, surfactants, plasticizers, tackifiers, surface lubricants, leveling agents, softeners, antioxidants, , A light stabilizer, an ultraviolet absorber, a polymerization inhibitor, an inorganic filler, an organic filler, a metal powder, a particulate, and a foil. These other additives may be one kind alone, or two or more kinds.

The pressure-sensitive adhesive layer has a loss tangent tan? In the entire temperature range of -40 占 폚 to 150 占 폚, preferably 0.10 or more. When the loss tangent tan delta in the entire temperature range of -40 DEG C to 150 DEG C of the pressure-sensitive adhesive layer is 0.10 or more, it is possible to provide a stress-dispersion film having more excellent stress dispersibility. The method of measuring the loss tangent tan? Will be described later.

The upper limit of the loss tangent tan? In the entire temperature range of -40 to 150 占 폚 of the pressure-sensitive adhesive layer is preferably 2.40 or less, more preferably 2.20 or less, still more preferably 2.00 or less, 1.80 or less. When the upper limit of the loss tangent tan? Is within the above range, it is possible to provide a stress dispersion film having more excellent stress dispersibility.

The lower limit of the loss tangent tan delta in the entire temperature range of -40 DEG C to 150 DEG C of the pressure-sensitive adhesive layer is preferably 0.12 or more, more preferably 0.14 or more, still more preferably 0.16 or more, 0.18 or more. When the lower limit of the loss tangent tan delta is within the above range, it is possible to provide a stress dispersion film having more excellent stress dispersibility.

«<C. Optical member, electronic member »»

The stress dispersion film of the present invention has excellent stress dispersibility. Therefore, it can be suitably used as a protective material for the purpose of protecting the optical member and the electron member from impact from the outside. That is, the optical member of the present invention comprises the stress-dispersion film of the present invention. Further, the electronic member of the present invention comprises the stress-dispersion film of the present invention.

Example

Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited to these examples at all. The test and evaluation methods in Examples and the like are as follows. Unless otherwise noted, the term "part" means "part by weight" unless otherwise specified, and "%" means "% by weight" unless otherwise specified.

&Lt; 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 Corporation. The weight average molecular weight (Mw) was determined as a polystyrene reduced value.

The measurement conditions are as follows.

Sample concentration: 0.2 wt% (THF solution)

Sample injection volume: 10 μl Eluent

THF flow rate: 0.6 ml / min

Measuring temperature: 40 ° C

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

Reference column: TSKgel SuperH-RC (1)

Detector: Differential refractometer (RI)

&Lt; Production of pressure-sensitive adhesive sheet (A)

(Examples 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 26, Comparative Examples 1, 3, 5,

The pressure-sensitive adhesive composition thus obtained was coated on a base material &quot; Lumirror S10 &quot; (thickness: 50 mu m, manufactured by Doraisha) made of a polyester resin so as to have a thickness of 10 mu m after drying with a fountain roll, And dried. Thus, a pressure-sensitive adhesive layer was formed on the substrate. Subsequently, on the surface of the pressure-sensitive adhesive layer, a silicone-treated surface of a base material containing a polyester resin having a thickness of 25 占 퐉, which had been subjected to silicone treatment on one side thereof, was bonded to obtain a pressure-sensitive adhesive sheet (A).

(Examples 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, Comparative Examples 2, 4, 6,

The pressure-sensitive adhesive composition thus obtained was coated on a base material &quot; Lumirror S10 &quot; (thickness 38 mu m, manufactured by Doraisha) made of a polyester resin so as to have a thickness of 22 mu m after drying with a fountain roll, And dried. Thus, a pressure-sensitive adhesive layer was formed on the substrate. Subsequently, on the surface of the pressure-sensitive adhesive layer, a silicone-treated surface of a base material containing a polyester resin having a thickness of 25 占 퐉, which had been subjected to silicone treatment on one side thereof, was bonded to obtain a pressure-sensitive adhesive sheet (A).

&Lt; Measurement of indentation energy &

The press-fitting energy was calculated by the following procedure using "SAICAS DN-20 type" manufactured by Daiwabintei Teshima at a measurement temperature of 25 ° C and a press-in speed of 5 탆 / sec.

(Procedure 1)

The pressure-sensitive adhesive sheet side of the obtained pressure-sensitive adhesive sheet (A) was attached to a flat indenter (load detection side), and the base side of the pressure-sensitive adhesive sheet (A) adhered to the flat indenters was pressed into the spherical indenter. And the indentation depth (占 퐉) was calculated.

(Procedure 2)

The pressure-sensitive adhesive layer side of the obtained pressure-sensitive adhesive sheet (A) was attached to a slide glass, and the pressure-sensitive adhesive sheet was pressed from the base side (load detection side) of the pressure-sensitive adhesive sheet (A) attached to the above slide glass with a spherical indenter, Respectively.

(? J) until the pressure-sensitive adhesive layer side of the pressure-sensitive adhesive sheet A is subjected to 20 N when the vertical load y applied to the spherical indenter is y = f (x) (x: indentation depth) (R is the indentation depth when a load of 20 N is applied to the pressure-sensitive adhesive layer side of the pressure-sensitive adhesive sheet (A)).

&Lt; Preparation of pressure-sensitive adhesive sheet (B)

The pressure-sensitive adhesive composition thus obtained was coated on a release surface of a polyester film (trade name: MRF, Mitsubishi Chemical Industries, Ltd.) having a thickness of 38 탆 with one side of which had been exfoliated with silicone so as to have a thickness of 50 占 퐉 after drying with a fountain roll And cured under the conditions of a drying temperature of 130 ° C and a drying time of 3 minutes. Thus, a pressure-sensitive adhesive layer was formed on the substrate. Subsequently, a polyester film (trade name: MRF, manufactured by Mitsubishi Chemical Polyester Co., Ltd.) having a thickness of 38 탆 and one side of which was subjected to a release treatment on the surface of the pressure-sensitive adhesive layer was peeled off from the pressure- Respectively. Thus, a pressure-sensitive adhesive sheet (B) was prepared.

&Lt; Measurement of glass transition temperature (Tg), storage elastic modulus, loss elastic modulus, and tan? (Loss tangent)

Using a dynamic viscoelasticity measuring apparatus (ARES, manufactured by Rheometrics Co., Ltd.).

Only the pressure-sensitive adhesive layer was taken out from the obtained pressure-sensitive adhesive sheet (B) and laminated to give a thickness of about 2 mm. The pellet was punched to a diameter of 7.9 mm to prepare a cylindrical pellet. The measurement sample was fixed to a jig of a 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 to calculate tan? = G" / G' , Tna? Was calculated. The temperature at which the obtained tan? Curve became the maximum was defined as a glass transition temperature (Tg) (占 폚).

The measurement conditions are as follows.

Measurement: Shear mode,

Temperature range: -70 ° C to 150 ° C

Heating rate: 5 ° C / min

Frequency: 1Hz

[Production Example 1] (meth) acrylic polymer (1)

100 parts by weight of 2-ethylhexyl acrylate (manufactured by Nippon Shokubai Co., Ltd.), 2 parts by weight of 2-hydroxyethyl acrylate (manufactured by Toagosei Co., Ltd.) were added to a four-necked flask equipped with a stirrer, a thermometer, , 0.2 part by weight of 2,2'-azobisisobutyronitrile (manufactured by Wako Pure Chemical Industries, Ltd.) as a polymerization initiator, and 156 parts by weight of ethyl acetate were fed into a flask, and nitrogen gas was introduced with gentle stirring , And a polymerization reaction was carried out for 6 hours while maintaining the liquid temperature in the flask at around 65 캜 to prepare a solution (40% by weight) of the (meth) acrylic polymer (1) having a weight average molecular weight of 550,000.

[Production Example 2]: (Meth) acrylic polymer (2)

100 parts by weight of 2-ethylhexyl acrylate (manufactured by Nippon Shokubai Co., Ltd.), 4 parts by weight of 4-hydroxybutyl acrylate (manufactured by Osaka Kiku Kagaku Kogyo Co., Ltd.) were added to a four-necked flask equipped with a stirrer, a thermometer, 10 parts by weight of acrylic acid (manufactured by Toagosei Co., Ltd.), 0.22 parts by weight of 2,2'-azobisisobutyronitrile (manufactured by Wako Pure Chemical Industries, Ltd.) as a polymerization initiator, (Meth) acrylic polymer (2) solution (40) having a weight average molecular weight of 54,000, and the solution temperature was maintained at about 65 캜 for 6 hours by introducing nitrogen gas while gently stirring the solution. Weight%).

[Production Example 3] (meth) acrylic polymer (3)

99 parts by weight of butyl acrylate (manufactured by Nippon Shokubai Co., Ltd.), 4 parts by weight of 4-hydroxybutyl acrylate (manufactured by Osaka Yuki Kagaku Kogyo Co., Ltd.) were added to a four-necked flask equipped with a stirrer, a thermometer, , 1 part by weight of 2,2'-azobisisobutyronitrile (produced by Wako Pure Chemical Industries, Ltd.) as a polymerization initiator, and 156 parts by weight of ethyl acetate were introduced, and nitrogen gas was introduced with gentle stirring , And a polymerization reaction was carried out for 7 hours while maintaining the liquid temperature in the flask at around 60 ° C to prepare a solution (39% by weight) of the (meth) acrylic polymer (3) having a weight average molecular weight of 1.6 million.

[Production Example 4] (meth) acryl-based polymer (4)

92 parts by weight of butyl acrylate (manufactured by Nippon Shokubai Co., Ltd.) and 5 parts by weight of N-acryloylmorpholine (manufactured by GoJin Co.) were added to a four-necked flask equipped with a stirrer, a thermometer, , 2.9 parts by weight of acrylic acid (manufactured by Toagosei Co., Ltd.), 0.1 part by weight of 2,2'-azobisisobutyronitrile (manufactured by Wako Pure Chemical Industries, Ltd.) as a polymerization initiator, and 200 parts by weight of ethyl acetate, (33 wt%) of a (meth) acrylic polymer (4) having a weight average molecular weight of 180,000 was prepared by introducing a nitrogen gas while stirring and maintaining the liquid temperature in the flask at about 55 ° C for 8 hours.

[Production Example 5] (Meth) acrylic polymer (5)

95 parts by weight of butyl acrylate (manufactured by Nippon Shokubai Co., Ltd.), 5 parts by weight of acrylic acid (manufactured by Toagosei Co., Ltd.), and 2 parts by weight of a polymerization initiator were added to a four-necked flask equipped with a stirrer, a thermometer, , 0.2 parts by weight of 2'-azobisisobutyronitrile (manufactured by Wako Pure Chemical Industries, Ltd.) and 156 parts by weight of ethyl acetate were fed into a flask and nitrogen gas was introduced with gentle stirring to adjust the liquid temperature in the flask to about 63 ° C And a polymerization reaction was carried out for 10 hours to prepare a solution (40% by weight) of a (meth) acrylic polymer (5) having a weight average molecular weight of 700,000.

[Production Example 6] (Meth) acrylic polymer (6) containing an alicyclic structure [

95 parts by weight, acrylic acid: 5 parts by weight, 2-mercaptoethanol as a chain transfer agent: 3 parts by weight (as a chain transfer agent) , 0.2 part by weight of 2,2'-azobisisobutyronitrile as a polymerization initiator, and 103.2 parts by weight of toluene as a polymerization solvent were charged into a separable flask and stirred for 1 hour while introducing nitrogen gas. After the oxygen in the polymerization system was removed in this manner, the temperature was elevated to 70 캜, and the reaction was carried out for 3 hours at 75 캜 for 2 hours to obtain a solution of the (meth) acrylic polymer 6 having a weight average molecular weight of 4000 %).

[Production Example 6] (Meth) acrylic polymer (7) containing an alicyclic structure [

100 parts by weight of toluene, dicyclopentanyl methacrylate (DCPMA) (trade name: FA-513M, manufactured by Hitachi Kasei Corporation) was added to a four-necked flask equipped with a stirrer, a thermometer, a nitrogen gas introducing tube, a condenser and a dropping funnel. : 60 parts by weight, methyl methacrylate (MMA): 40 parts by weight, and chain transfer agent: methyl thioglycolate: 3.5 parts by weight. Then, the mixture was stirred at 70 ° C for 1 hour in a nitrogen atmosphere, and then 0.2 parts by weight of 2,2'-azobisisobutyronitrile as a polymerization initiator was added thereto. The resultant mixture was reacted at 70 ° C for 2 hours, After the reaction, the reaction was carried out at 90 ° C for 1 hour to obtain a solution (51% by weight) of the (meth) acrylic polymer (7) having a weight average molecular weight of 4000.

[Examples 1 and 2]

(1) was diluted with ethyl acetate so as to have a total solid content of 25% by weight based on 100 parts by weight of the solid content of the solution of the (meth) acrylic polymer (1), and stirred with a disperser To obtain a pressure-sensitive adhesive composition (1) containing an acrylic resin. The results are shown in Table 1.

[Examples 3 and 4]

(Manufactured by NIPPON POLYURETHANE CO., LTD.) As a crosslinking agent in an amount of 0.01 part by weight in terms of solids, relative to 100 parts by weight of the solid content of the solution of the (meth) acrylic polymer (1) And 0.005 parts by weight in terms of solid content of dibasic iron (manufactured by Nihon Kagaku Co., Ltd.) as a crosslinking catalyst were added, diluted with ethyl acetate so that the total solid content was 25% by weight, and stirred with a disperser to obtain an acrylic resin To obtain a pressure-sensitive adhesive composition (2). The results are shown in Table 1.

[Examples 5 and 6]

0.1 part by weight of Coronate L (manufactured by Nippon Polyurethane Industry Co., Ltd.) as a crosslinking agent in terms of solid content was added to a solution of the (meth) acrylic polymer (1) in 100 parts by weight of the solid content of the solution of the (meth) And 0.005 parts by weight in terms of solid content of dibasic iron (manufactured by Nihon Kagaku Co., Ltd.) as a crosslinking catalyst were added, diluted with ethyl acetate so that the total solid content was 25% by weight, and stirred with a disperser to obtain an acrylic resin To obtain a pressure-sensitive adhesive composition (3). The results are shown in Table 1.

[Examples 7, 8]

(Manufactured by NIPPON POLYURETHANE CO., LTD.) As a crosslinking agent in an amount of 0.05 part by weight in terms of solid matter, relative to 100 parts by weight of the solid content of the solution of the (meth) acrylic polymer (1) , 0.005 part by weight of nematic ferric oxide (manufactured by Nihon Kagaku Co., Ltd.) in terms of solid content as a crosslinking catalyst, and 5 parts by weight of a solution of the (meth) acrylic polymer (6) in terms of solid content were added, %, And the mixture was stirred with a disper to obtain a pressure-sensitive adhesive composition (4) containing an acrylic resin. The results are shown in Table 1.

[Examples 9 and 10]

0.1 part by weight of Coronate L (manufactured by Nippon Polyurethane Industry Co., Ltd.) as a crosslinking agent in terms of solid content was added to a solution of the (meth) acrylic polymer (1) in 100 parts by weight of the solid content of the solution of the (meth) , 0.005 part by weight of nematic ferric oxide (manufactured by Nihon Kagaku Co., Ltd.) in terms of solid content as a crosslinking catalyst, and 5 parts by weight of a solution of the (meth) acrylic polymer (6) in terms of solid content were added, %, And the mixture was stirred with a disper to obtain a pressure-sensitive adhesive composition (5) containing an acrylic resin. The results are shown in Table 1.

[Examples 11 and 12]

0.3 part by weight in terms of solid content of Coronate L (manufactured by Nippon Polyurethane Industry Co., Ltd.) as a cross-linking agent was added to a solution of the (meth) acrylic polymer (1) in 100 parts by weight of the solid content of the solution of the (meth) , 0.005 part by weight of nematic ferric oxide (manufactured by Nihon Kagaku Co., Ltd.) in terms of solid content as a crosslinking catalyst, and 5 parts by weight of a solution of the (meth) acrylic polymer (6) in terms of solid content were added, %, And the mixture was stirred with a disper to obtain a pressure-sensitive adhesive composition (6) containing an acrylic resin. The results are shown in Table 1.

[Examples 13, 14]

0.1 part by weight of Coronate L (manufactured by Nippon Polyurethane Industry Co., Ltd.) as a crosslinking agent in terms of solid content was added to a solution of the (meth) acrylic polymer (1) in 100 parts by weight of the solid content of the solution of the (meth) , 0.005 part by weight of nematic ferric oxide (manufactured by Nihon Kagaku Co., Ltd.) in terms of solid content as a crosslinking catalyst, and 5 parts by weight of a solution of the (meth) acrylic polymer (7) in terms of solid content were added, %, And the mixture was stirred with a disper to obtain a pressure-sensitive adhesive composition (7) containing an acrylic resin. The results are shown in Table 1.

[Examples 15 and 16]

0.3 part by weight in terms of solid content of Coronate L (manufactured by Nippon Polyurethane Industry Co., Ltd.) as a cross-linking agent was added to a solution of the (meth) acrylic polymer (1) in 100 parts by weight of the solid content of the solution of the (meth) , 0.005 part by weight of nematic ferric oxide (manufactured by Nihon Kagaku Co., Ltd.) in terms of solid content as a crosslinking catalyst, and 5 parts by weight of a solution of the (meth) acrylic polymer (7) in terms of solid content were added, %, And the mixture was stirred with a disper to obtain a pressure-sensitive adhesive composition (8) containing an acrylic resin. The results are shown in Table 1.

[Examples 17, 18]

(Meth) acryl-based polymer (2) was diluted with ethyl acetate so that the total solid content was 25% by weight based on 100 parts by weight of the solid content of the solution of the (meth) acrylic polymer (2) To obtain a pressure-sensitive adhesive composition (9) containing an acrylic resin. The results are shown in Table 2.

[Examples 19, 20]

0.1 part by weight of Coronate L (manufactured by Nippon Polyurethane Industry Co., Ltd.) in terms of solid content as a crosslinking agent was added to a solution of the (meth) acrylic polymer (2) in 100 parts by weight of the solid content of the solution of the (meth) , 0.05 part by weight of TETRAD-C (manufactured by Mitsubishi Gas Chemical Company) as solid content, and 0.005 part by weight of nashematic iron (manufactured by Nihon Kagaku Co., Ltd.) as a crosslinking catalyst in terms of solid content were added to obtain a total solid content of 25 Diluted with ethyl acetate so as to be in a weight percentage, and stirred with a disper to obtain a pressure-sensitive adhesive composition (10) comprising an acrylic resin. The results are shown in Table 2.

[Examples 21 and 22]

0.02 part by weight of Coronate L (manufactured by Nippon Polyurethane Industry Co., Ltd.) as a crosslinking agent in terms of solid content was added to a solution of the (meth) acrylic polymer (3) in 100 parts by weight of the solid content of the solution of the (meth) And 0.005 parts by weight in terms of solid content of dibasic iron (manufactured by Nihon Kagaku Co., Ltd.) as a crosslinking catalyst were added, diluted with ethyl acetate so that the total solid content was 25% by weight, and stirred with a disperser to obtain an acrylic resin To obtain a pressure-sensitive adhesive composition (11). The results are shown in Table 2.

[Examples 23, 24]

0.075 part by weight of TETRAD-C (manufactured by Mitsubishi Gas Chemical Company) as a crosslinking agent in terms of solid content was added to a solution of the (meth) acrylic polymer (5) in 100 parts by weight of the solid content of the solution of the (meth) And 0.005 parts by weight in terms of solid content of dibasic iron (manufactured by Nihon Kagaku Co., Ltd.) as a crosslinking catalyst were added, diluted with ethyl acetate so that the total solid content was 25% by weight, and stirred with a disperser to obtain an acrylic resin To obtain a pressure-sensitive adhesive composition (12). The results are shown in Table 2.

[Example 25]

100 parts by weight of Hiabra 5125 (Kuraray Co., Ltd.) was diluted with toluene so that the total solid content was 25% by weight to obtain a pressure-sensitive adhesive composition (13) comprising a rubber-based resin. The results are shown in Table 2.

[Example 26]

100 parts by weight of Hiabra 5127 (Kuraray Co., Ltd.) was diluted with toluene so that the total solid content was 25% by weight to obtain a pressure-sensitive adhesive composition (14) comprising a rubber-based resin. The results are shown in Table 2.

[Comparative Examples 1 and 2]

0.5 part by weight in terms of solid content of Coronate L (manufactured by Nippon Polyurethane Industry Co., Ltd.) as a crosslinking agent was added to a solution of the (meth) acrylic polymer (1) in 100 parts by weight of the solid content of the solution of the (meth) And 0.005 parts by weight in terms of solid content of dibasic iron (manufactured by Nihon Kagaku Co., Ltd.) as a crosslinking catalyst were added, diluted with ethyl acetate so that the total solid content was 25% by weight, and stirred with a disperser to obtain an acrylic resin To obtain a pressure-sensitive adhesive composition (C1). The results are shown in Table 2.

[Comparative Examples 3 and 4]

0.45 parts by weight of Coronate L (manufactured by Nippon Polyurethane Industry Co., Ltd.) as a crosslinking agent in terms of solid content was added to a solution of the (meth) acrylic polymer (2) in 100 parts by weight of the solid content of the solution of the (meth) , 0.3 parts by weight of TETRAD-C (manufactured by Mitsubishi Gas Chemical Company) as solid content, and 0.005 parts by weight of nashematic iron (manufactured by Nihon Kagaku Co., Ltd.) as a crosslinking catalyst in terms of solid content as a crosslinking catalyst were added, Diluted with ethyl acetate so as to have a weight%, and stirred with a disper to obtain a pressure-sensitive adhesive composition (C2) containing an acrylic resin. The results are shown in Table 2.

[Comparative Examples 5 and 6]

0.3 part by weight of Coronate L (manufactured by Nippon Polyurethane Industry Co., Ltd.) as a crosslinking agent in terms of solid content was added to a solution of the (meth) acrylic polymer (4) in 100 parts by weight of the solid content of the solution of the (meth) And 0.005 parts by weight in terms of solid content of dibasic iron (manufactured by Nihon Kagaku Co., Ltd.) as a crosslinking catalyst were added, diluted with ethyl acetate so that the total solid content was 25% by weight, and stirred with a disperser to obtain an acrylic resin To obtain a pressure-sensitive adhesive composition (C3). The results are shown in Table 2.

[Comparative Examples 7 and 8]

0.075 part by weight of TETRAD-C (manufactured by Mitsubishi Gas Chemical Company) as a crosslinking agent in terms of solid content was added to a solution of the (meth) acrylic polymer (5) in 100 parts by weight of the solid content of the solution of the (meth) , 0.005 parts by weight of nematic ferric oxide (manufactured by Nihon Kagaku Co., Ltd.) as a crosslinking catalyst in terms of solid content, and 20 parts by weight of a solution of the (meth) acrylic polymer (6) in terms of solid content were added, %, And the mixture was stirred with a disper to obtain a pressure-sensitive adhesive composition (C4) containing an acrylic resin. The results are shown in Table 2.

[Example 27]

The polyester film was peeled from one side of each of the pressure-sensitive adhesive sheet (A) and the pressure-sensitive adhesive sheet (B) obtained from the pressure-sensitive adhesive composition (1) obtained in Examples 1 and 2, and a polarizing plate (manufactured by Nitto Denka Co., , Trade name &quot; TEG1465DUHC &quot;) to obtain an optical member to which a pressure-sensitive adhesive sheet was adhered.

[Example 28]

A polyester film was peeled from one side of each of the pressure-sensitive adhesive sheet (A) and the pressure-sensitive adhesive sheet (B) obtained from the pressure-sensitive adhesive composition (2) obtained in Examples 3 and 4, and a polarizing plate (manufactured by Nitto Denko Co., , Trade name &quot; TEG1465DUHC &quot;) to obtain an optical member to which a pressure-sensitive adhesive sheet was adhered.

[Example 29]

A polyester film was peeled from one side of each of the pressure-sensitive adhesive sheet (A) and the pressure-sensitive adhesive sheet (B) obtained from the pressure-sensitive adhesive composition (4) obtained in Examples 7 and 8 and a polarizing plate (manufactured by Nitto Denka Co., , Trade name &quot; TEG1465DUHC &quot;) to obtain an optical member to which a pressure-sensitive adhesive sheet was adhered.

[Example 30]

A polyester film was peeled from one side of the pressure-sensitive adhesive sheet (A) and the pressure-sensitive adhesive sheet (B) obtained from the pressure-sensitive adhesive composition (7) obtained in Examples 13 and 14, and a polarizing plate (manufactured by Nitto Denka Co., , Trade name &quot; TEG1465DUHC &quot;) to obtain an optical member to which a pressure-sensitive adhesive sheet was adhered.

[Example 31]

The polyester film was peeled from one side of each of the pressure-sensitive adhesive sheet (A) and the pressure-sensitive adhesive sheet (B) obtained from the pressure-sensitive adhesive composition (9) obtained in Examples 17 and 18, and a polarizing plate (manufactured by Nitto Denko Co., , Trade name &quot; TEG1465DUHC &quot;) to obtain an optical member to which a pressure-sensitive adhesive sheet was adhered.

[Example 32]

A polyester film was peeled from one side of each of the pressure-sensitive adhesive sheet (A) and pressure-sensitive adhesive sheet (B) obtained from the pressure-sensitive adhesive composition (10) obtained in Examples 19 and 20 and a polarizing plate (manufactured by Nitto Denko Co., , Trade name &quot; TEG1465DUHC &quot;) to obtain an optical member to which a pressure-sensitive adhesive sheet was adhered.

[Example 33]

A polyester film was peeled from one side of each of the pressure-sensitive adhesive sheet (A) and the pressure-sensitive adhesive sheet (B) obtained from the pressure-sensitive adhesive composition (11) obtained in Examples 21 and 22 and a polarizing plate (manufactured by Nitto Denko Co., , Trade name &quot; TEG1465DUHC &quot;) to obtain an optical member to which a pressure-sensitive adhesive sheet was adhered.

[Example 34]

The polyester film was peeled from one side of each of the pressure-sensitive adhesive sheet (A) and the pressure-sensitive adhesive sheet (B) obtained from the pressure-sensitive adhesive composition (12) obtained in Examples 23 and 24, and a polarizing plate (manufactured by Nitto Denko Co., , Trade name &quot; TEG1465DUHC &quot;) to obtain an optical member to which a pressure-sensitive adhesive sheet was adhered.

[Example 35]

A polyester film was peeled off from one side of each of the pressure-sensitive adhesive sheet (A) and the pressure-sensitive adhesive sheet (B) obtained from the pressure-sensitive adhesive composition (13) obtained in Example 25 and a polarizing plate (manufactured by Nitto Denko Co., Quot; TEG1465DUHC &quot;) to obtain an optical member to which a pressure-sensitive adhesive sheet was adhered.

[Example 36]

A polyester film was peeled from one side of each of the pressure-sensitive adhesive sheet (A) and the pressure-sensitive adhesive sheet (B) obtained from the pressure-sensitive adhesive composition (14) obtained in Example 26 and a polarizing plate (manufactured by Nitto Denko Co., Quot; TEG1465DUHC &quot;) to obtain an optical member to which a pressure-sensitive adhesive sheet was adhered.

[Example 37]

A polyester film was peeled from one side of each of the pressure-sensitive adhesive sheet (A) and the pressure-sensitive adhesive sheet (B) obtained from the pressure-sensitive adhesive composition (1) obtained in Examples 1 and 2 and a conductive film (Nitto Denko Co., Manufactured by Nissan Chemical Industries, Ltd. under the trade name of "ELECORA V270L-TFMP") to obtain an electronic member to which a pressure-sensitive adhesive sheet was adhered.

[Example 38]

A polyester film was peeled from one side of each of the pressure-sensitive adhesive sheet (A) and the pressure-sensitive adhesive sheet (B) obtained from the pressure-sensitive adhesive composition (2) obtained in Examples 3 and 4 and a conductive film (Nitto Denko Co., Manufactured by Nissan Chemical Industries, Ltd. under the trade name of "ELECORA V270L-TFMP") to obtain an electronic member to which a pressure-sensitive adhesive sheet was adhered.

[Example 39]

A polyester film was peeled from one side of each of the pressure-sensitive adhesive sheet (A) and the pressure-sensitive adhesive sheet (B) obtained from the pressure-sensitive adhesive composition (4) obtained in Examples 7 and 8 and a conductive film (Nitto Denko Co., Manufactured by Nissan Chemical Industries, Ltd. under the trade name of "ELECORA V270L-TFMP") to obtain an electronic member to which a pressure-sensitive adhesive sheet was adhered.

[Example 40]

A polyester film was peeled from one side of each of the pressure-sensitive adhesive sheet (A) and the pressure-sensitive adhesive sheet (B) obtained from the pressure-sensitive adhesive composition (7) obtained in Examples 13 and 14 and a conductive film (Nitto Denko Co., Manufactured by Nissan Chemical Industries, Ltd. under the trade name of "ELECORA V270L-TFMP") to obtain an electronic member to which a pressure-sensitive adhesive sheet was adhered.

[Example 41]

A polyester film was peeled from one side of each of the pressure-sensitive adhesive sheet (A) and the pressure-sensitive adhesive sheet (B) obtained from the pressure-sensitive adhesive composition (9) obtained in Examples 17 and 18 and a conductive film (Nitto Denko Co., Manufactured by Nissan Chemical Industries, Ltd. under the trade name of "ELECORA V270L-TFMP") to obtain an electronic member to which a pressure-sensitive adhesive sheet was adhered.

[Example 42]

A polyester film was peeled off from one side of each of the pressure-sensitive adhesive sheet (A) and the pressure-sensitive adhesive sheet (B) obtained from the pressure-sensitive adhesive composition (10) obtained in Examples 19 and 20 and a conductive film (Nitto Denko Co., Manufactured by Nissan Chemical Industries, Ltd. under the trade name of "ELECORA V270L-TFMP") to obtain an electronic member to which a pressure-sensitive adhesive sheet was adhered.

[Example 43]

A polyester film was peeled off from one side of each of the pressure-sensitive adhesive sheet (A) and the pressure-sensitive adhesive sheet (B) obtained from the pressure-sensitive adhesive composition (11) obtained in Examples 21 and 22 and a conductive film (Nitto Denko Co., Manufactured by Nissan Chemical Industries, Ltd. under the trade name of "ELECORA V270L-TFMP") to obtain an electronic member to which a pressure-sensitive adhesive sheet was adhered.

[Example 44]

A polyester film was peeled from one side of each of the pressure-sensitive adhesive sheet (A) and the pressure-sensitive adhesive sheet (B) obtained from the pressure-sensitive adhesive composition (12) obtained in Examples 23 and 24 and a conductive film (Nitto Denko Co., Manufactured by Nissan Chemical Industries, Ltd. under the trade name of "ELECORA V270L-TFMP") to obtain an electronic member to which a pressure-sensitive adhesive sheet was adhered.

[Example 45]

A polyester film was peeled from one side of each of the pressure-sensitive adhesive sheet (A) and the pressure-sensitive adhesive sheet (B) obtained from the pressure-sensitive adhesive composition (13) obtained in Example 25, and a conductive film (manufactured by Nitto Denko Co., Product name &quot; ELECORA V270L-TFMP &quot;) to obtain an electronic member to which a pressure-sensitive adhesive sheet was adhered.

[Example 46]

A polyester film was peeled from one side of each of the pressure-sensitive adhesive sheet (A) and the pressure-sensitive adhesive sheet (B) obtained from the pressure-sensitive adhesive composition (14) obtained in Example 26 and a conductive film (manufactured by Nitto Denko Co., Product name &quot; ELECORA V270L-TFMP &quot;) to obtain an electronic member to which a pressure-sensitive adhesive sheet was adhered.

The stress dispersion film of the present invention can be suitably used as a protective material for the purpose of, for example, protecting an optical member or an electron member from impact from the outside.

10: Plastic film
20: pressure-sensitive adhesive layer
100: Stress dispersion film

Claims (8)

A stress dispersion film comprising a laminate of a plastic film and a pressure-sensitive adhesive layer,
Wherein the plastic film has a thickness of 15 탆 to 500 탆,
Wherein the pressure-sensitive adhesive layer is formed from a pressure-sensitive adhesive composition, and the pressure-sensitive adhesive composition comprises a monomer unit (I) derived from a (meth) acrylic acid alkyl ester having an alkyl group having an alkyl group of 1 to 20 carbon atoms as an alkyl ester portion and an OH group and / (A) having a monomer unit (II) derived from a (meth) acrylic acid ester,
Wherein the pressure-sensitive adhesive composition comprises a polymer (B) having a weight average molecular weight of 1,000 or more and less than 30,000, having a monomer unit derived from a (meth) acrylic acid ester containing an alicyclic structure represented by the formula (1)
And a press-in energy of 260 占 J or more and 10000 占 때 or less when a load is applied in a direction perpendicular to the laminate from the plastic film side of the laminate.
CH ₂ = C (R ¹ ) COOR ² ... (One)
(In the formula (1), R ¹ is a hydrogen atom or a methyl group, and R ² is a hydrocarbon group having an alicyclic structure) The stress distribution film according to claim 1, wherein the plastic film has a thickness of 20 to 300 占 퐉. The stress dispersion film according to claim 1 or 2, wherein the thickness of the pressure-sensitive adhesive layer is 1 to 300 mu m. The pressure-sensitive adhesive composition according to claim 1 or 2, wherein the molar content ratio of NCO groups in the pressure-sensitive adhesive composition is defined as [NCO], the molar content ratio of epoxy groups in the pressure-sensitive adhesive composition is [epoxy] ([NCO] + [epoxy]) / ([OH] + [COOH]) < COOH &quot;, where the molar content ratio is [OH] and the molar content ratio of COOH groups in the pressure- 0.05. The stress-dispersive film according to claim 1 or 2, wherein the pressure-sensitive adhesive composition comprises an organic polyisocyanate-based crosslinking agent and / or an epoxy-based crosslinking agent. The stress dispersion film according to any one of claims 1 to 3, wherein the loss tangent tan? Of the pressure-sensitive adhesive layer in the entire temperature range of -40 占 폚 to 150 占 폚 is 0.10 or more and 2.40 or less. An optical member comprising the stress-dispersion film according to any one of claims 1 to 5. An electronic member comprising the stress-dispersion film according to any one of claims 1 to 5.

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