WO2015033654A1 - 水分散型粘着剤組成物、粘着剤層、粘着型光学フィルム、及び、画像表示装置 - Google Patents
水分散型粘着剤組成物、粘着剤層、粘着型光学フィルム、及び、画像表示装置 Download PDFInfo
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- WO2015033654A1 WO2015033654A1 PCT/JP2014/067677 JP2014067677W WO2015033654A1 WO 2015033654 A1 WO2015033654 A1 WO 2015033654A1 JP 2014067677 W JP2014067677 W JP 2014067677W WO 2015033654 A1 WO2015033654 A1 WO 2015033654A1
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J151/00—Adhesives based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
- C09J151/003—Adhesives based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/12—Polymerisation in non-solvents
- C08F2/16—Aqueous medium
- C08F2/22—Emulsion polymerisation
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/14—Methyl esters, e.g. methyl (meth)acrylate
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- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
- C08F220/1804—C4-(meth)acrylate, e.g. butyl (meth)acrylate, isobutyl (meth)acrylate or tert-butyl (meth)acrylate
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F265/00—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00
- C08F265/04—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00 on to polymers of esters
- C08F265/06—Polymerisation of acrylate or methacrylate esters on to polymers thereof
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
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- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09J133/08—Homopolymers or copolymers of acrylic acid esters
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09J133/10—Homopolymers or copolymers of methacrylic acid esters
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J151/00—Adhesives based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
- C09J151/06—Adhesives based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2255/00—Coating on the layer surface
- B32B2255/26—Polymeric coating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
- B32B2264/02—Synthetic macromolecular particles
- B32B2264/0214—Particles made of materials belonging to B32B27/00
- B32B2264/025—Acrylic resin particles, e.g. polymethyl methacrylate or ethylene-acrylate copolymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2457/00—Electrical equipment
- B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2457/00—Electrical equipment
- B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
- B32B2457/202—LCD, i.e. liquid crystal displays
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
- C08F220/1806—C6-(meth)acrylate, e.g. (cyclo)hexyl (meth)acrylate or phenyl (meth)acrylate
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
Definitions
- the present invention relates to a water-dispersed pressure-sensitive adhesive composition, a pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive composition, a pressure-sensitive adhesive optical film in which the pressure-sensitive adhesive layer is provided on at least one surface of the optical film, and the pressure-sensitive adhesive mold
- the present invention relates to a liquid crystal display device using an optical film, an organic EL display device, an image display device such as a CRT and a PDP.
- Image display devices such as liquid crystal display devices (LCD) and organic EL display devices are indispensable to dispose polarizing elements on both sides of a liquid crystal cell, for example, in liquid crystal display devices because of their image forming methods. Is attached with a polarizing plate.
- various optical elements have been used for display panels such as liquid crystal panels and organic EL panels in order to improve the display quality of displays.
- a front plate is used to protect an image display device such as a liquid crystal display device, an organic EL display device, a CRT, or a PDP, to give a high-class feeling, or to differentiate a design.
- a viewing angle widening film For members used together with image display devices such as liquid crystal display devices and organic EL display devices, and front display plates, for example, retardation plates for preventing coloration, and for improving the viewing angle of liquid crystal displays
- a viewing angle widening film a brightness enhancement film for increasing the contrast of a display, a hard coat film used for imparting scratch resistance to the surface, an anti-glare treatment film for preventing reflection on an image display device,
- Surface treatment films such as antireflection films such as reflective films and low reflective films are used. These films are collectively called optical films.
- an adhesive is usually used.
- the adhesion between the optical film and the display panel such as the liquid crystal cell and the organic EL panel, or the front plate, or the optical film is usually in close contact with each other using an adhesive to reduce the loss of light.
- an adhesive optical film provided in advance as an adhesive layer on one side of the optical film is generally used because it has the merit that a drying step is not required to fix the optical film. It is done.
- the adhesive optical film When the adhesive optical film is bonded to a display panel such as a liquid crystal cell and an organic EL panel, or to the front plate, if the bonding position is incorrect or a foreign object is caught in the bonding surface, the optical film is removed from the liquid crystal cell. In some cases, it may be peeled off and reused. When peeling, the gap of the liquid crystal cell is changed, the function of the organic EL panel is lowered, the optical film is not broken, that is, the releasability (reworkability) that can easily peel off the adhesive optical film. Desired.
- image display devices tend to be thinner, and the display panel constituting the image display device and the adhesive optical films attached to the display panel also tend to be thinned.
- the glass plate constituting the display panel is thinned, the glass plate is liable to be destroyed when the attached adhesive optical film is peeled off, while the optical film (support) constituting the adhesive optical film.
- the thickness of the adhesive film is reduced, there is a problem that the optical film is easily broken when the adhesive optical film is peeled off. Furthermore, such destruction became more remarkable as the size of the pressure-sensitive adhesive optical film was increased.
- a method for increasing the removability generally, a method for increasing the elastic modulus of the pressure-sensitive adhesive is known.
- a pressure-sensitive adhesive that can be freely attached to an adherend and can be re-peeled.
- a sheet is disclosed (for example, see Patent Document 1).
- the pressure-sensitive adhesive sheet of Patent Document 1 is used for a fastening system such as a disposable diaper, and is not sufficient from the viewpoint of adhesion reliability. Moreover, since the adhesive used for formation of the adhesive tape of patent document 1 contains an elastomer, its transparency is low, for example, it was not suitable for the field
- the peeling is achieved at a higher speed from the viewpoint of productivity improvement.
- the peeling speed when peeling the pressure-sensitive adhesive sheet is increased, the peeling force is generally increased.
- the conventional pressure-sensitive adhesive layer has a problem that high-speed peeling is difficult.
- the present invention provides a water-dispersed pressure-sensitive adhesive composition capable of forming a pressure-sensitive adhesive layer that satisfies removability and sufficient adhesion reliability, and a pressure-sensitive adhesive formed from the water-dispersed pressure-sensitive adhesive composition.
- the purpose is to provide a layer.
- another object of the present invention is to provide an adhesive optical film in which the adhesive layer is laminated on at least one surface of the optical film, and an image display device including the adhesive optical film.
- the present invention relates to emulsion particles having a core-shell structure in which (meth) acrylic copolymer (A) is present as a core layer and (meth) acrylic copolymer (B) is present as a shell layer in the same emulsion particle.
- a water-dispersed pressure-sensitive adhesive composition containing The glass transition temperature of the (meth) acrylic copolymer (B) is from ⁇ 10 ° C. to 20 ° C.
- the water-dispersed pressure-sensitive adhesive composition of the present invention is useful for optical film applications.
- the glass transition temperature of the emulsion particles is preferably -25 to 15 ° C.
- the glass transition temperature of the (meth) acrylic copolymer (A) is preferably less than 0 ° C.
- the glass transition temperature of the (meth) acrylic copolymer (A) is lower than the glass transition temperature of the (meth) acrylic copolymer (B).
- Both the (meth) acrylic copolymer (A) and the (meth) acrylic copolymer (B) are emulsion-polymerized monomer components containing a (meth) acrylic acid alkyl ester and a carboxyl group-containing monomer. It is preferable that the proportion of the carboxyl group-containing monomer is 0.1 to 8% by weight with respect to the monomer component.
- the present invention also relates to a pressure-sensitive adhesive layer formed from the water-dispersed pressure-sensitive adhesive composition.
- the pressure-sensitive adhesive layer of the present invention is useful for optical film applications.
- the peeling force when peeling at a peeling speed of 0.5 m / min, 1.5 m / min, and 2.5 m / min in a 180 ° direction under an atmosphere of 23 ° C it is preferable that the peeling force is equal to or less than the peeling force when peeling at a peeling speed of 0.005 m / min in a 180 ° direction in an atmosphere of 23 ° C.
- the peeling force when peeling at a peeling speed of 0.5 m / min, 1.5 m / min, and 2.5 m / min in a 180 ° direction under an atmosphere of 23 ° C. Both are preferably 5 N / 25 mm or less.
- the present invention also relates to an adhesive optical film, wherein the adhesive layer is laminated on at least one surface of the optical film, and an image display device comprising the adhesive optical film.
- this invention it is possible to provide a water-dispersed pressure-sensitive adhesive composition capable of forming a pressure-sensitive adhesive layer that satisfies removability and sufficient adhesion reliability. Moreover, this invention can provide the adhesive layer formed from the said water-dispersed adhesive composition, the adhesive optical film, and an image display apparatus.
- the (meth) acrylic copolymer (A) is present as a core layer and the (meth) acrylic copolymer (B) is present as a shell layer in the same emulsion particle. , Containing core-shell structured emulsion particles,
- the (meth) acrylic copolymer (B) has a glass transition temperature (Tg) of ⁇ 10 ° C. or higher and 20 ° C. or lower.
- the glass transition temperature of the (meth) acrylic copolymer (B) forming the shell layer is ⁇ 10 ° C. or higher and 20 ° C. or lower.
- the glass transition temperature is preferably higher than ⁇ 10 ° C., more preferably ⁇ 5 ° C. or higher, further preferably higher than ⁇ 5 ° C., further preferably ⁇ 3 ° C. or higher, and 0 ° C. or higher. Is more preferable, and it is particularly preferable to exceed 0 ° C.
- the said glass transition temperature is less than 20 degreeC, and it is more preferable that it is 18 degrees C or less.
- the removability and sufficient are achieved by controlling the glass transition temperature of the (meth) acrylic copolymer (B) constituting the shell layer expected to be in direct contact with the adherend within the above range. It is possible to achieve both excellent bonding reliability.
- the glass transition temperature of the (meth) acrylic copolymer (A) forming the core layer is not particularly limited and can be appropriately set.
- the glass transition temperature is from ⁇ 60 ° C. to 100 ° C.
- a range of ⁇ 60 ° C. to 80 ° C. is more preferable, and a range of ⁇ 55 ° C. to less than 0 ° C. is more preferable.
- the (meth) acrylic copolymer constituting the core layer is used in order to control the glass transition temperature of the (meth) acrylic copolymer (B) constituting the shell layer of the core-shell structure to be high. It is preferable to appropriately adjust the glass transition temperature of the combined body (A) to maintain the function of the entire pressure-sensitive adhesive.
- the glass transition temperature of the emulsion particles having a core-shell structure in which the (meth) acrylic copolymer (A) is present as the core layer and the (meth) acrylic copolymer (B) is present as the shell layer is not particularly limited.
- the temperature is preferably ⁇ 25 to 15 ° C., more preferably ⁇ 25 to 10 ° C.
- the glass transition temperature of the (meth) acrylic copolymer (A) is preferably lower than the glass transition temperature of the (meth) acrylic copolymer (B), and the (meth) acrylic copolymer (
- the difference between the glass transition temperature of A) and the glass transition temperature of the (meth) acrylic copolymer (B) ((B)-(A)) is not particularly limited, but is preferably greater than 0 ° C., It is more preferably 10 ° C. or higher, further preferably 40 ° C. or higher, and particularly preferably 50 ° C. or higher.
- the glass transition temperature of the (meth) acrylic copolymer (A) and the (meth) acrylic copolymer (B) is determined by the following FOX formula from the monomer units constituting each polymer and the ratio thereof. It is a calculated theoretical value.
- FOX formula (Tg: Glass transition temperature (K) of polymer, Tg 1 , Tg 2 ,..., Tg n : Glass transition temperature (K) of homopolymer of each monomer, W 1 , W 2 ,. n : weight fraction of each monomer)
- the glass transition temperature of the (meth) acrylic copolymer (A) and the (meth) acrylic copolymer (B) is calculated based on the monofunctional monomer. That is, even in the case where each polymer contains a polyfunctional monomer as a constituent monomer unit, the amount of the polyfunctional monomer used is small, and the glass transition temperature of the copolymer is small. Not included in temperature calculation. Moreover, since the alkoxysilyl group-containing monomer is recognized as a polyfunctional monomer, it is not included in the calculation of the glass transition temperature.
- the theoretical glass transition temperature obtained from the FOX equation is in good agreement with the measured glass transition temperature obtained by differential scanning calorimetry (DSC) or dynamic viscoelasticity.
- the type and composition of the monomer units are not particularly limited, but the alkyl (meth) acrylate is not limited. It is preferably obtained by emulsion polymerization of a monomer component containing an ester, more preferably obtained by emulsion polymerization of a monomer component containing a (meth) acrylic acid alkyl ester and a carboxyl group-containing monomer. preferable.
- the (meth) acrylic acid alkyl ester refers to an acrylic acid alkyl ester and / or a methacrylic acid alkyl ester, and has the same meaning as (meth) in the present invention.
- the (meth) acrylic acid alkyl ester preferably has a water solubility within a certain range from the viewpoint of emulsion polymerization reactivity, and has an alkyl group having 1 to 1 carbon atoms because the glass transition temperature can be easily controlled. Eighteen (meth) acrylic acid alkyl esters are preferred.
- (meth) acrylic acid alkyl esters include methyl acrylate, ethyl acrylate, propyl acrylate, n-butyl acrylate, t-butyl acrylate, n-hexyl acrylate, cyclohexyl acrylate, acrylic acid 2 -Ethylhexyl, n-octyl acrylate, lauryl acrylate, tridecyl acrylate, stearyl acrylate, alkyl acrylates, methyl methacrylate, ethyl methacrylate, propyl methacrylate, n-butyl methacrylate, t-butyl methacrylate , N-hexyl methacrylate, cyclohexyl methacrylate, 2-ethylhexyl methacrylate, n-octyl methacrylate, lauryl methacrylate, tridecyl methacrylate, steary
- the alkyl acrylate is preferably contained in an amount of 60 to 99.9% by weight, preferably 70 to 99.9% by weight, based on all monomers constituting the (meth) acrylic copolymer (B). Is more preferably 80 to 99.9% by weight, and particularly preferably 80 to 95% by weight.
- the acrylic acid alkyl ester constituting the (meth) acrylic copolymer (B) is preferably 30 to 95% by weight with respect to all monomers constituting the whole particle.
- the monomer component constituting the (meth) acrylic copolymer (B) contains a carboxyl group-containing monomer from the viewpoint of improving the adhesiveness of the pressure-sensitive adhesive and imparting stability to the emulsion.
- the carboxyl group-containing monomer include those having a radical polymerizable unsaturated double bond such as a carboxyl group and a (meth) acryloyl group, a vinyl group, such as (meth) acrylic acid, itaconic acid, maleic acid, Examples include fumaric acid, crotonic acid, carboxyethyl acrylate, and carboxypentyl acrylate.
- the carboxyl group-containing monomer is preferably contained in an amount of 0.1 to 8% by weight, and preferably 0.5 to 7% by weight, based on all monomers constituting the (meth) acrylic copolymer (B). More preferably, the content is 1 to 5% by weight.
- the monomer component constituting the (meth) acrylic copolymer (B) includes stabilization of an aqueous dispersion, an optical film of an adhesive layer, and the like.
- the monomer component constituting the (meth) acrylic copolymer (B) includes stabilization of an aqueous dispersion, an optical film of an adhesive layer, and the like.
- it has a polymerizable functional group related to an unsaturated double bond such as a (meth) acryloyl group or a vinyl group.
- One or more copolymerization monomers can be added.
- Examples of the copolymerization monomer include alkoxysilyl group-containing monomers.
- the alkoxysilyl group-containing monomer is a silane coupling agent-based unsaturated monomer having at least one unsaturated double bond such as a (meth) acryloyl group or a vinyl group and having an alkoxysilyl group.
- the alkoxysilyl group-containing monomer is preferable for imparting a crosslinked structure to the (meth) acrylic copolymer (B) and improving the adhesion to glass.
- alkoxysilyl group-containing monomer examples include alkoxysilyl group-containing (meth) acrylate monomers and alkoxysilyl group-containing vinyl monomers.
- alkoxysilyl group-containing (meth) acrylate monomer examples include (meth) acryloyloxymethyl-trimethoxysilane, (meth) acryloyloxymethyl-triethoxysilane, 2- (meth) acryloyloxyethyl-trimethoxysilane, 2 -(Meth) acryloyloxyethyl-triethoxysilane, 3- (meth) acryloyloxypropyl-trimethoxysilane, 3- (meth) acryloyloxypropyl-triethoxysilane, 3- (meth) acryloyloxypropyl-tripropoxysilane , (Meth) acryloyloxyalkyl-trialkoxysilanes such as 3- (meth) acryloyloxypropyl-triisopropoxysilane, 3- (meth) acryloyloxypropyl-tributoxysilane; For example, (me
- alkoxysilyl group-containing vinyl monomer examples include vinyltrialkoxysilanes such as vinyltrimethoxysilane, vinyltriethoxysilane, vinyltripropoxysilane, vinyltriisopropoxysilane, vinyltributoxysilane, and vinyl corresponding to these.
- Alkyldialkoxysilanes and vinyldialkylalkoxysilanes such as vinylmethyltrimethoxysilane, vinylmethyltriethoxysilane, ⁇ -vinylethyltrimethoxysilane, ⁇ -vinylethyltriethoxysilane, ⁇ -vinylpropyltrimethoxysilane, ⁇ -Vinyl amines such as vinylpropyltriethoxysilane, ⁇ -vinylpropyltripropoxysilane, ⁇ -vinylpropyltriisopropoxysilane, and ⁇ -vinylpropyltributoxysilane
- Other quilt trialkoxysilane correspond and (vinyl) alkyl dialkoxy silanes, and the like (vinyl alkyl) dialkyl (mono) alkoxysilanes.
- the proportion of the alkoxysilyl group-containing monomer is preferably 1% by weight or less, and preferably 0.001 to 1% by weight, based on all monomers constituting the (meth) acrylic copolymer (B). More preferably, it is 0.01 to 0.5% by weight, further preferably 0.03 to 0.1% by weight. If it is less than 0.001% by weight, the effect of using an alkoxysilyl group-containing monomer (addition of a crosslinked structure, adhesion to glass) tends not to be obtained sufficiently. There is a possibility that the degree of cross-linking of the layer becomes too high and cracking of the pressure-sensitive adhesive layer over time occurs.
- examples of the copolymerization monomer include a phosphate group-containing monomer.
- the phosphate group-containing monomer has an effect of improving the adhesion to glass.
- Examples of the phosphate group-containing monomer include the following general formula (1): (Wherein R 1 represents a hydrogen atom or a methyl group, R 2 represents an alkylene group having 1 to 4 carbon atoms, m represents an integer of 2 or more, and M 1 and M 2 each independently represent a hydrogen atom. Or a phosphate group-containing monomer represented by a cation).
- m represents the degree of polymerization of the oxyalkylene group (—O—R 2 —), and is an integer of 2 or more, preferably an integer of 4 or more. 40 or less.
- the polyoxyalkylene group include a polyoxyethylene group and a polyoxypropylene group, and these polyoxyalkylene groups may be random, block or graft units.
- the cation related to the phosphate group salt is not particularly limited, and for example, an alkali metal such as sodium or potassium, an inorganic cation such as an alkaline earth metal such as calcium or magnesium, for example, a quaternary amine or the like. Organic cations.
- the proportion of the phosphate group-containing monomer is preferably 20% by weight or less, and preferably 0.1 to 20% by weight, based on the total monomers constituting the (meth) acrylic copolymer (B). More preferred. When the phosphate group-containing monomer exceeds 20% by weight, it is not preferable from the viewpoint of polymerization stability.
- the copolymerizable monomer other than the alkoxysilyl group-containing monomer and the phosphate group-containing monomer include, for example, acid anhydride group-containing monomers such as maleic anhydride and itaconic anhydride; for example, phenyl (meth) acrylate (Meth) acrylic acid aryl esters, for example, vinyl esters such as vinyl acetate and vinyl propionate; for example, styrenic monomers such as styrene; for example, glycidyl (meth) acrylate, methyl glycidyl (meth) acrylate, etc.
- acid anhydride group-containing monomers such as maleic anhydride and itaconic anhydride
- phenyl (meth) acrylate (Meth) acrylic acid aryl esters for example, vinyl esters such as vinyl acetate and vinyl propionate
- styrenic monomers such as styrene
- Epoxy group-containing monomers for example, hydroxyl group-containing monomers such as 2-hydroxyethyl acrylate and 2-hydroxypropyl acrylate; for example, (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N, N-diethyl ( (Meth) acrylamide, N Isopropyl (meth) acrylamide, N-butyl (meth) acrylamide, N-methylol (meth) acrylamide, N-methylolpropane (meth) acrylamide, (meth) acryloylmorpholine, aminoethyl (meth) acrylate, (meth) acrylic acid Nitrogen atom-containing monomers such as N, N-dimethylaminoethyl and t-butylaminoethyl (meth) acrylate; for example, alkoxy group-containing monomers such as methoxyethyl (meth) acrylate and ethoxyethyl (me
- copolymerizable monomers include maleimide monomers such as N-cyclohexylmaleimide, N-isopropylmaleimide, N-laurylmaleimide, and N-phenylmaleimide; for example, N-methylitaconimide, N-ethylitaconimide, N Itaconimide monomers such as butyl itaconimide, N-octyl itaconimide, N-2-ethylhexylitaconimide, N-cyclohexyl itaconimide, N-lauryl itaconimide; N- (meth) acryloyloxymethylene succinimide, N- Succinimide monomers such as (meth) acryloyl-6-oxyhexamethylene succinimide and N- (meth) acryloyl-8-oxyoctamethylene succinimide; for example, styrene sulfonic acid Examples include sulfonic acid group
- glycol-based acrylic ester monomers such as polyethylene glycol (meth) acrylate, polypropylene glycol (meth) acrylate, methoxyethylene glycol (meth) acrylate, and methoxypolypropylene glycol (meth) acrylate
- examples include, for example, tetrahydrofurfuryl (meth) acrylate, a heterocyclic ring such as fluorine (meth) acrylate, and an acrylate monomer containing a halogen atom.
- a polyfunctional monomer other than the alkoxysilyl group-containing monomer can be used for adjusting the gel fraction of the water-dispersed pressure-sensitive adhesive composition.
- the polyfunctional monomer include compounds having two or more unsaturated double bonds such as a (meth) acryloyl group and a vinyl group.
- alkylene glycol di (meth) acrylates such as ethylene glycol di (meth) acrylate and (mono or poly) propylene glycol di (meth) acrylate such as propylene glycol di (meth) acrylate, neopentyl glycol Di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, pentaerythritol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, pen Esterified products of (meth) acrylic acid and polyhydric alcohols such as erythritol tri (meth) acrylate and dipentaerythritol hexa (meth) acrylate; polyfunctional vinyl compounds such as divinylbenzene; diacetone acrylamide; allyl (meth) acrylate And compounds having unsaturated double bonds with different reactivity, such as vinyl (mono or poly) alkylene glycol di (meth
- polyester (meta) having two or more unsaturated double bonds such as (meth) acryloyl group and vinyl group as functional groups similar to the monomer component is added to a skeleton such as polyester, epoxy, and urethane.
- a skeleton such as polyester, epoxy, and urethane.
- Acrylate, epoxy (meth) acrylate, urethane (meth) acrylate, and the like can also be used.
- the proportion of the monomer does not increase the viscosity of the emulsion.
- It is preferably 20% by weight or less, more preferably 10% by weight or less, and particularly preferably 5% by weight or less, based on all monomers constituting the acrylic copolymer (B).
- the copolymerizable monomer is a polyfunctional monomer, the proportion thereof is 5% by weight or less based on the total monomers constituting the (meth) acrylic copolymer (B) from the viewpoint of emulsion stability. More preferred is 3% by weight or less, and particularly preferred is 1% by weight or less.
- the (meth) acrylic copolymer (A) forming the core layer is not particularly limited as described above, but is obtained by emulsion polymerization of a monomer component containing a (meth) acrylic acid alkyl ester. It is preferable that it is obtained by emulsion polymerization of a monomer component containing a (meth) acrylic acid alkyl ester and a carboxyl group-containing monomer.
- the (meth) acrylic acid alkyl ester used in the (meth) acrylic copolymer (A) preferably has a water solubility within a certain range from the viewpoint of emulsion polymerization reactivity.
- the main component is preferably a (meth) acrylic acid alkyl ester having 1 to 18 carbon atoms as exemplified in the polymer (B).
- Specific examples of the (meth) acrylic acid alkyl ester include those similar to the above. Of these, alkyl acrylates having an alkyl group with 3 to 9 carbon atoms are preferred, and n-butyl acrylate and 2-ethylhexyl acrylate are more preferred.
- the (meth) acrylic acid alkyl ester is preferably contained in an amount of 60 to 99.9% by weight, more preferably 70 to 99.9% by weight, based on all monomers constituting the (meth) acrylic copolymer (A). More preferably, it is 80 to 99% by weight, further preferably 80 to 98% by weight.
- the acrylic acid alkyl ester constituting the (meth) acrylic copolymer (A) is preferably 3 to 50% by weight, and preferably 3 to 40% by weight with respect to all monomers constituting the whole particle. More preferably.
- the monomer component constituting the (meth) acrylic copolymer (A) contains a carboxyl group-containing monomer.
- the carboxyl group-containing monomer include the same ones as exemplified for the (meth) acrylic copolymer (B).
- the carboxyl group-containing monomer is preferably contained in an amount of 0.1 to 8% by weight, preferably 0.5 to 7% by weight, based on all monomers constituting the (meth) acrylic copolymer (A). More preferably, the content is 1 to 5% by weight.
- the (meth) acrylic copolymer (A) can contain the copolymerization monomers exemplified as the (meth) acrylic copolymer (B) as monomer units.
- the copolymerization monomer include an alkoxysilyl group-containing monomer, a phosphate group-containing monomer, a polyfunctional monomer, and other monomers. These copolymerization monomers are (meth) acrylic copolymers (B). It can be used at a ratio similar to the ratio in.
- the (meth) acrylic copolymer (A) and the (meth) acrylic copolymer (B) preferably contain (meth) acrylic acid alkyl ester as a monomer unit.
- the type and composition of the components, and the monomers can be combined as appropriate.
- the presence of the (meth) acrylic copolymer (B) as a shell layer may increase the adhesive force when the peeling rate in the rework operation is increased as in the prior art.
- the adhesive force decreases, and even at a high peeling speed, a low adhesive force can be realized and rework can be easily performed.
- it has high adhesive reliability. .
- the (meth) acrylic copolymer (A) and the (meth) acrylic copolymer (B) it is possible to suppress a decrease in cohesive force while ensuring adhesiveness of the pressure-sensitive adhesive. This tends to be possible and is preferable. That is, 50 to 95% by weight of (meth) acrylic copolymer (B) is contained as a shell layer so that the total of the respective copolymers is 100% by weight, whereas as a core layer ( The meth) acrylic copolymer (A) is contained in an amount of 5 to 50% by weight.
- the (meth) acrylic copolymer (B) is preferably 60% by weight or more, and more preferably 70% by weight or more.
- the (meth) acrylic copolymer (B) is 95% by weight or less, more preferably 90% by weight or less. If the (meth) acrylic copolymer (B) is 95% by weight or less, the effect is good even if it has no monomer units other than the (meth) acrylic acid alkyl ester and the carboxyl group-containing monomer. When the (meth) acrylic copolymer (B) exceeds 95% by weight, the cohesive force of the pressure-sensitive adhesive is reduced, and peeling with time tends to occur.
- the core-shell structure emulsion particles are obtained by multi-stage emulsion polymerization in which the core layer copolymer is formed by emulsion polymerization, and then the shell layer copolymer is emulsion polymerized in the presence of the core layer copolymer.
- the monomer component constituting the copolymer of the core layer or the shell layer is polymerized in water in the presence of a surfactant (emulsifier) and a radical polymerization initiator, whereby the core layer or the shell layer.
- a copolymer can be formed.
- the emulsion polymerization of the monomer component can be performed by a conventional method.
- a surfactant (emulsifier), a radical polymerization initiator, and a chain transfer agent are appropriately blended together with the monomer components described above.
- a known emulsion polymerization method such as a batch charging method (batch polymerization method), a monomer dropping method, or a monomer emulsion dropping method can be employed.
- a monomer dropping method continuous dropping or divided dropping is appropriately selected. These methods can be appropriately combined. Reaction conditions and the like are selected as appropriate, but the polymerization temperature is preferably about 40 to 95 ° C., for example, and the polymerization time is preferably about 30 minutes to 24 hours.
- the surfactant (emulsifier) used for emulsion polymerization is not particularly limited, and various surfactants usually used for emulsion polymerization are used.
- As the surfactant for example, an anionic surfactant or a nonionic surfactant is used.
- anionic surfactants include higher fatty acid salts such as sodium oleate; alkyl aryl sulfonates such as sodium dodecylbenzene sulfonate; alkyl sulfate salts such as sodium lauryl sulfate and ammonium lauryl sulfate; polyoxyethylene lauryl Polyoxyethylene alkyl ether sulfate salts such as sodium ether sulfate; Polyoxyethylene alkyl aryl ether sulfate salts such as polyoxyethylene nonylphenyl ether sodium sulfate; Sodium monooctylsulfosuccinate, sodium dioctylsulfosuccinate, polyoxyethylene laurylsulfosuccinate Alkylsulfosuccinic acid ester salts such as sodium acid salt and derivatives thereof; polyoxyethylene distyrenated phenyl Ether can be exemplified sulfuric acid ester salts such as
- nonionic surfactants include polyoxyethylene alkyl ethers such as polyoxyethylene lauryl ether and polyoxyethylene stearyl ether; polyoxyethylene alkyl such as polyoxyethylene octyl phenyl ether and polyoxyethylene nonyl phenyl ether Sorbitan monolaurate, sorbitan monostearate, sorbitan higher fatty acid esters such as sorbitan trioleate; polyoxyethylene sorbitan higher fatty acid esters such as polyoxyethylene sorbitan monolaurate; polyoxyethylene monolaurate; Polyoxyethylene higher fatty acid esters such as polyoxyethylene monostearate; oleic acid monoglyceride, stearic acid monoglyceride, etc. Can be exemplified polyoxyethylene-polyoxypropylene block copolymers, polyoxyethylene distyrenated phenyl ether; glycerol higher fatty acid esters.
- a reactive surfactant having a radical polymerizable functional group related to an ethylenically unsaturated double bond can be used as the surfactant.
- a radical polymerizable surfactant obtained by introducing a radical polymerizable functional group (radical reactive group) such as propenyl group or allyl ether group into the anionic surfactant or nonionic surfactant. Agents and the like. These surfactants are appropriately used alone or in combination.
- a radical polymerizable surfactant having a radical polymerizable functional group is preferably used from the viewpoint of the stability of the aqueous dispersion and the durability of the pressure-sensitive adhesive layer.
- anionic reactive surfactant examples include alkyl ethers (commercially available products such as Aqualon KH-05, KH-10, KH-20, manufactured by Daiichi Kogyo Seiyaku Co., Ltd., Asahi Denka Kogyo Co., Ltd.) Adekaria soap SR-10N, SR-20N manufactured by Kao Co., Ltd.
- Latemul PD-104, etc. Sulfosuccinic acid ester type (commercially available products include Latmul S-120, S-120A manufactured by Kao Corporation) , S-180P, S-180A, Sanyo Chemical Co., Ltd., Eleminol JS-20, etc.); alkylphenyl ethers or alkylphenyl esters (commercially available products include, for example, Aqualon H-manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) 2855A, H-3855B, H-3855C, H-3856, HS-05, HS-10, HS-20, HS-30, BC-05, B -10, BC-20, Adeka Soap SDX-222, SDX-223, SDX-232, SDX-233, SDX-259, SE-10N, SE-20N manufactured by Asahi Denka Kogyo Co., Ltd .; (meth) acrylate Sulfate ester type (
- Nonionic reactive surfactants include, for example, alkyl ethers (commercially available products include, for example, Adeka Soap ER-10, ER-20, ER-30, ER-40, Kao (manufactured by Asahi Denka Kogyo Co., Ltd.) Laterum PD-420, PD-430, PD-450, etc.); alkyl phenyl ethers or alkyl phenyl esters (commercially available products include, for example, Aqualon RN-10, RN- manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) 20, RN-30, RN-50, Adeka Soap NE-10, NE-20, NE-30, NE-40, etc.
- alkyl ethers commercially available products include, for example, Adeka Soap ER-10, ER-20, ER-30, ER-40, Kao (manufactured by Asahi Denka Kogyo Co., Ltd.) Laterum
- the blending ratio of the surfactant is from 0.3 to 100 parts by weight based on 100 parts by weight of the monomer component forming the (meth) acrylic copolymer (A) and the (meth) acrylic copolymer (B).
- the amount is preferably 10 parts by weight.
- adhesion characteristics, polymerization stability, mechanical stability, and the like can be improved.
- the radical polymerization initiator is not particularly limited, and a known radical polymerization initiator usually used for emulsion polymerization is used.
- a known radical polymerization initiator usually used for emulsion polymerization is used.
- 2,2′-azobisisobutyronitrile, 2,2′-azobis (2-methylpropionamidine) disulfate, 2,2′-azobis (2-methylpropionamidine) dihydrochloride, 2, Azo initiators such as 2′-azobis (2-amidinopropane) dihydrochloride, 2,2′-azobis [2- (2-imidazolin-2-yl) propane] dihydrochloride; for example, potassium persulfate, Persulfate initiators such as ammonium persulfate; peroxide initiators such as benzoyl peroxide, t-butyl hydroperoxide, hydrogen peroxide; substituted ethane initiators such as phenyl substituted ethane; And carbonyl-
- polymerization initiators are suitably used alone or in combination. Moreover, when performing emulsion polymerization, it can be set as the redox-type initiator which uses a reducing agent together with a polymerization initiator depending on necessity. Thereby, it becomes easy to accelerate the emulsion polymerization rate or to perform the emulsion polymerization at a low temperature.
- reducing agents include reducing organic compounds such as metal salts such as ascorbic acid, ersorbic acid, tartaric acid, citric acid, glucose, formaldehyde sulfoxylate; sodium thiosulfate, sodium sulfite, sodium bisulfite, meta
- metal salts such as ascorbic acid, ersorbic acid, tartaric acid, citric acid, glucose, formaldehyde sulfoxylate
- sodium thiosulfate sodium sulfite, sodium bisulfite
- meta include reducing inorganic compounds such as sodium bisulfite; ferrous chloride, Rongalite, thiourea dioxide, and the like.
- the blending ratio of the radical polymerization initiator is appropriately selected, and is, for example, about 0.02 to 1 part by weight, preferably 0.02 to 0.5 part by weight, based on 100 parts by weight of the monomer component. More preferably, it is 0.05 to 0.3 parts by weight. If it is less than 0.02 part by weight, the effect as a radical polymerization initiator may be reduced. If it exceeds 1 part by weight, a (meth) acrylic copolymer (A) related to an aqueous dispersion (polymer emulsion) (A ) Or (meth) acrylic copolymer (B) may have a reduced molecular weight, which may reduce the durability of the water-dispersed pressure-sensitive adhesive.
- the reducing agent is preferably used in the range of 0.01 to 1 part by weight with respect to 100 parts by weight of the total amount of monomer components.
- the chain transfer agent adjusts the molecular weight of the water-dispersed (meth) acrylic polymer, and a chain transfer agent usually used for emulsion polymerization can be used as necessary.
- a chain transfer agent usually used for emulsion polymerization examples thereof include mercaptans such as 1-dodecanethiol, mercaptoacetic acid, 2-mercaptoethanol, 2-ethylhexyl thioglycolate, 2,3-dimethylcapto-1-propanol, and mercaptopropionic acid esters.
- These chain transfer agents are appropriately used alone or in combination.
- the blending ratio of the chain transfer agent is, for example, 0.3 parts by weight or less, and preferably 0.001 to 0.3 parts by weight with respect to 100 parts by weight of the monomer component.
- the (meth) acrylic copolymer (A) or the (meth) acrylic copolymer (B) usually has a weight average molecular weight of preferably 1,000,000 or more, and particularly preferably has a weight average molecular weight of 1,000,000 to 4,000,000. Those are preferred.
- the pressure-sensitive adhesive obtained by emulsion polymerization is preferable because its molecular weight becomes very high due to its polymerization mechanism.
- the pressure-sensitive adhesive obtained by emulsion polymerization generally has a large gel content and cannot be measured by GPC (gel permeation chromatography), it is often difficult to support the actual measurement regarding molecular weight.
- the water-dispersed pressure-sensitive adhesive composition contains core-shell structure emulsion particles as a main component, but the preparation of the core-shell structure emulsion particles did not participate in the core-shell structure.
- An emulsion of the polymer (A) and an emulsion of the (meth) acrylic copolymer (B) may be generated.
- the water-dispersed pressure-sensitive adhesive composition contains an emulsion of (meth) acrylic copolymer (A) and an emulsion of (meth) acrylic copolymer (B) in addition to the core-shell structured emulsion particles. May be.
- the water-dispersed pressure-sensitive adhesive composition of the present invention includes core-shell structure emulsion particles, (meth) acrylic copolymer (A) emulsion particles, and (meth) acrylic copolymer (B) emulsion particles.
- a crosslinking agent can be contained as needed.
- the crosslinking agent generally used ones such as an isocyanate crosslinking agent, an epoxy crosslinking agent, an oxazoline crosslinking agent, an aziridine crosslinking agent, a carbodiimide crosslinking agent, and a metal chelate crosslinking agent can be used.
- these (meth) acrylic copolymers have a functional group
- these crosslinking agents have an effect of reacting with the functional group to crosslink.
- the blending ratio of the crosslinking agent is not particularly limited, but is usually blended at a ratio of about 10 parts by weight or less of the crosslinking agent (solid content) with respect to 100 parts by weight of the total solid content of the water-dispersed pressure-sensitive adhesive composition. It is preferable.
- a cohesive force can be provided to an adhesive layer with a crosslinking agent, when a crosslinking agent is used, there exists a tendency for adhesiveness to worsen.
- the water-dispersed pressure-sensitive adhesive composition of the present invention includes a viscosity modifier, a release modifier, a tackifier, a plasticizer, a softener, glass fiber, glass beads, metal powder, and other inorganic materials as necessary. Fillers made of powder, pigments, colorants (pigments, dyes, etc.), pH adjusters (acids or bases), antioxidants, ultraviolet absorbers, silane coupling agents, etc. do not depart from the purpose of the present invention. Various additives can be appropriately used within a range. Moreover, it is good also as an adhesive layer etc. which contain microparticles
- the number average particle diameter of the emulsion particles of the water-dispersed pressure-sensitive adhesive composition of the present invention is preferably 50 to 150 nm, more preferably 50 to 130 nm, and even more preferably 50 to 120 nm.
- the pressure-sensitive adhesive layer of the present invention is formed from the water-dispersed pressure-sensitive adhesive composition.
- the pressure-sensitive adhesive layer can be formed by applying the water-dispersed pressure-sensitive adhesive composition to a support substrate (optical film or release film) and then drying it.
- Various methods are used for the application process of the water-dispersed pressure-sensitive adhesive composition. Specifically, for example, roll coat, kiss roll coat, gravure coat, reverse coat, roll brush, spray coat, dip roll coat, bar coat, knife coat, air knife coat, curtain coat, lip coat, die coater, etc. Examples thereof include an extrusion coating method.
- the coating amount is controlled so that the formed pressure-sensitive adhesive layer has a predetermined thickness (thickness after drying).
- the thickness of the pressure-sensitive adhesive layer is usually set in the range of about 1 to 100 ⁇ m, preferably 5 to 50 ⁇ m, more preferably 10 to 40 ⁇ m.
- the applied water-dispersed pressure-sensitive adhesive composition is dried.
- the drying temperature is preferably 80 ° C. or more higher than the glass transition temperature (FOX theoretical value) of the water-dispersed pressure-sensitive adhesive composition, and more preferably 100 ° C. or more.
- the upper limit of drying temperature is not specifically limited, It is preferable that it is less than the temperature 170 degreeC higher than a glass transition temperature.
- the drying temperature within the above range is preferable because the residual moisture content of the pressure-sensitive adhesive layer is reduced, the rate of change in the refractive index at the particle interface due to water is reduced, and the depolarization property can be reduced. If the drying temperature is less than 80 ° C.
- the drying time is about 0.3 to 30 minutes, preferably 0.3 to 10 minutes.
- the water content of the obtained pressure-sensitive adhesive layer is preferably 1.0% by weight or less based on the total weight of the pressure-sensitive adhesive layer.
- the moisture content of the pressure-sensitive adhesive layer is preferably as small as possible and is preferably 0% by weight. However, it is difficult to completely remove water, and usually about 0.1% by weight remains.
- the pressure-sensitive adhesive layer of the present invention preferably has a haze value of 2% or less, more preferably 0 to 1% when the pressure-sensitive adhesive layer has a thickness of 25 ⁇ m. If the haze is 2% or less, the transparency required when the pressure-sensitive adhesive layer is used in an optical member can be satisfied. If the haze value exceeds 2%, white turbidity occurs, which is not preferable for optical applications.
- the haze value can be measured by the method described in the examples.
- the pressure-sensitive adhesive layer of the present invention is bonded to glass and then peeled when peeled in a 180 ° direction at a peeling rate of 0.5 to 2.5 m / min in an atmosphere of 23 ° C. (particularly, a peeling rate of 0 .5m / min, 1.5m / min, peeling force when peeling at 2.5m / min) is preferably below the peeling force when peeling at a peeling speed of 0.005m / min under the same conditions. .
- the peeling force is within the above range, it is possible to satisfy the high peeling force at the time of low-speed peeling, which means practical adhesion reliability, and the low peeling force at the time of actual peeling.
- the pressure-sensitive adhesive layer of the present invention is peeled off at a peeling rate of 0.5 to 2.5 m / min in a 180 ° direction in an atmosphere of 23 ° C.
- the peeling force when peeling at a speed of 0.5 m / min, 1.5 m / min, and 2.5 m / min) is 0.5 of the peeling force when peeling at a peeling speed of 0.005 m / min under the same conditions. It is preferably less than or equal to twice, more preferably 0.05 to 0.4 times.
- the peeling force is within the above range, it is possible to satisfy the high peeling force at the time of low-speed peeling, which means practical adhesion reliability, and the low peeling force at the time of actual peeling.
- a peeling force (especially, a peeling speed of 0.5 m / min) is peeled at a peeling speed of 0.5 to 2.5 m / min in a 180 ° direction in an atmosphere of 23 ° C. Min, 1.5 m / min, peeling force when peeling at 2.5 m / min) is preferably 5 N / 25 mm or less, more preferably 0.1 to 5 N / 25 mm.
- the peeling force when peeling at a peeling speed of 0.5 m / min is 0.1 to 5 N / 25 mm, and the peeling force when peeling at a peeling speed of 1.5 m / min and 2.5 m / min is Particularly preferred is 0.1 to 2 N / 25 mm.
- the constituent material of the release film examples include plastic films such as polyethylene, polypropylene, polyethylene terephthalate, and polyester films, porous materials such as paper, cloth, and nonwoven fabric, nets, foamed sheets, metal foils, and laminates thereof.
- plastic films such as polyethylene, polypropylene, polyethylene terephthalate, and polyester films
- porous materials such as paper, cloth, and nonwoven fabric, nets, foamed sheets, metal foils, and laminates thereof.
- a plastic film is preferably used from the viewpoint of excellent surface smoothness.
- the plastic film is not particularly limited as long as it can protect the pressure-sensitive adhesive layer.
- a polyethylene film, a polypropylene film, a polybutene film, a polybutadiene film, a polymethylpentene film, a polyvinyl chloride film, and a vinyl chloride film are used.
- examples thereof include a polymer film, a polyethylene terephthalate film, a polybutylene terephthalate film, a polyurethane film, and an ethylene-vinyl acetate copolymer film.
- the thickness of the release film is usually about 5 to 200 ⁇ m, preferably about 5 to 100 ⁇ m.
- release and antifouling treatment with a silicone-based, fluorine-based, long-chain alkyl-based or fatty acid amide-based release agent, silica powder, etc., coating type, kneading type, An antistatic treatment such as a vapor deposition type can also be performed.
- the release property from the pressure-sensitive adhesive layer can be further improved by appropriately performing a release treatment such as silicone treatment, long-chain alkyl treatment, or fluorine treatment on the surface of the release film.
- the pressure-sensitive adhesive layer When the pressure-sensitive adhesive layer is exposed, the pressure-sensitive adhesive layer may be protected with a release film until practical use.
- said release film can be used as a release film of an adhesive optical film as it is, and the process surface can be simplified.
- the water-dispersed pressure-sensitive adhesive composition and pressure-sensitive adhesive layer of the present invention for example, it is preferable to use an optical film as described later, but besides that, various types such as an optical protective tape and a transparent double-sided pressure-sensitive adhesive tape Can be used for applications.
- the pressure-sensitive adhesive optical film of the present invention is obtained by laminating the pressure-sensitive adhesive layer on one side or both sides of an optical film.
- the pressure-sensitive adhesive optical film of the present invention is formed by applying a water-dispersed pressure-sensitive adhesive composition to an optical film or a release film and drying it by the method described above. When the pressure-sensitive adhesive layer is formed on the release film, the pressure-sensitive adhesive layer is attached to the optical film and transferred.
- an anchor layer is formed, or various pressure-sensitive adhesive treatments such as corona treatment and plasma treatment are performed, and then the pressure-sensitive adhesive layer is formed. can do. Moreover, you may perform an easily bonding process on the surface of an adhesive layer.
- an anchor agent selected from polyurethane, polyester, polymers containing an amino group in the molecule and polymers containing an oxazolinyl group is preferably used, and an amino group in the molecule is particularly preferably used. And polymers containing an oxazolinyl group. Polymers containing an amino group in the molecule and polymers containing an oxazolinyl group are good because the amino group or oxazolinyl group in the molecule shows an interaction such as a reaction or ionic interaction with the carboxyl group in the adhesive. Secure adhesion.
- polymers containing an amino group in the molecule include polymers of amino-containing group-containing monomers such as polyethyleneimine, polyallylamine, polyvinylamine, polyvinylpyridine, polyvinylpyrrolidine, and dimethylaminoethyl acrylate.
- the optical film one used for forming an image display device such as a liquid crystal display device is used, and the type thereof is not particularly limited.
- a polarizing plate is mentioned as an optical film.
- the polarizing plate one having a transparent protective film on one side or both sides of a polarizer is generally used.
- the polarizer is not particularly limited, and various types can be used.
- polarizers include dichroic iodine and dichroic dyes on hydrophilic polymer films such as polyvinyl alcohol films, partially formalized polyvinyl alcohol films, and ethylene / vinyl acetate copolymer partially saponified films.
- hydrophilic polymer films such as polyvinyl alcohol films, partially formalized polyvinyl alcohol films, and ethylene / vinyl acetate copolymer partially saponified films.
- examples thereof include polyene-based oriented films such as those obtained by adsorbing substances and uniaxially stretched, polyvinyl alcohol dehydrated products and polyvinyl chloride dehydrochlorinated products.
- a polarizer composed of a polyvinyl alcohol film and a dichroic material such as iodine is preferable.
- the thickness of these polarizers is not particularly limited, but is generally about 5 to 80 ⁇ m.
- a polarizer obtained by dyeing a polyvinyl alcohol film with iodine and uniaxially stretching it can be produced, for example, by dyeing polyvinyl alcohol in an aqueous iodine solution and stretching it 3 to 7 times the original length. If necessary, it can be immersed in an aqueous solution such as potassium iodide which may contain boric acid, zinc sulfate, zinc chloride or the like. Further, if necessary, the polyvinyl alcohol film may be immersed in water and washed before dyeing.
- Stretching may be performed after dyeing with iodine, may be performed while dyeing, or may be dyed with iodine after stretching.
- the film can be stretched even in an aqueous solution such as boric acid or potassium iodide or in a water bath.
- thermoplastic resin excellent in transparency, mechanical strength, thermal stability, moisture barrier property, isotropy and the like is used.
- thermoplastic resins include cellulose resins such as triacetyl cellulose, polyester resins, polyethersulfone resins, polysulfone resins, polycarbonate resins, polyamide resins, polyimide resins, polyolefin resins, (meth) acrylic resins, cyclic Examples thereof include polyolefin resins (norbornene resins), polyarylate resins, polystyrene resins, polyvinyl alcohol resins, and mixtures thereof.
- a transparent protective film is bonded to one side of the polarizer by an adhesive layer.
- thermosetting resin such as a system or an ultraviolet curable resin
- a thermosetting resin such as a system or an ultraviolet curable resin
- the additive include an ultraviolet absorber, an antioxidant, a lubricant, a plasticizer, a mold release agent, an anti-coloring agent, a flame retardant, a nucleating agent, an antistatic agent, a pigment, and a coloring agent.
- the content of the thermoplastic resin in the transparent protective film is preferably 50 to 100% by weight, more preferably 50 to 99% by weight, still more preferably 60 to 98% by weight, and particularly preferably 70 to 97% by weight. .
- content of the said thermoplastic resin in a transparent protective film is 50 weight% or less, there exists a possibility that the high transparency etc. which a thermoplastic resin originally has cannot fully be expressed.
- optical film examples include liquid crystal display devices such as a reflection plate, an anti-transmission plate, a retardation plate (including wavelength plates such as 1/2 and 1/4), a visual compensation film, a brightness enhancement film, and a surface treatment film. What becomes an optical layer which may be used for formation of etc. is mentioned. These can be used alone as an optical film, or can be laminated on the polarizing plate for practical use, and one or more layers can be used.
- the surface treatment film is also provided by bonding to the front plate.
- Anti-reflective films such as hard coat films used to impart surface scratch resistance, anti-glare treated films to prevent reflection on image display devices, anti-reflective films, low-reflective films, etc. Is mentioned.
- the front plate is attached to the surface of the image display device in order to protect the image display device such as a liquid crystal display device, an organic EL display device, a CRT, or a PDP, to give a high-class feeling, or to differentiate by design. It is provided together.
- the front plate is used as a support for a ⁇ / 4 plate in 3D-TV. For example, in a liquid crystal display device, it is provided above the polarizing plate on the viewing side.
- the pressure-sensitive adhesive layer of the present invention is used, the same effect as that of the glass substrate can be exhibited not only on the glass substrate but also on a plastic substrate such as a polycarbonate substrate and a polymethylmethacrylate substrate. .
- An optical film in which the optical layer is laminated on a polarizing plate can be formed by a method of sequentially laminating separately in the manufacturing process of a liquid crystal display device or the like.
- an appropriate adhesive means such as an adhesive layer can be used for the lamination.
- the pressure-sensitive adhesive optical film of the present invention can be preferably used for forming various image display devices such as a liquid crystal display device.
- the liquid crystal display device can be formed according to the conventional method. That is, the liquid crystal display device is generally formed by appropriately assembling components such as a liquid crystal cell, an adhesive optical film, and an illumination system as necessary, and incorporating a drive circuit. There is no limitation in particular except the point which uses the adhesion type optical film by this invention, and it can apply according to the former.
- the liquid crystal cell any type such as a TN type, STN type, ⁇ type, VA type, IPS type, or the like can be used.
- Appropriate liquid crystal display devices such as a liquid crystal display device in which an adhesive optical film is disposed on one side or both sides of a display panel such as a liquid crystal cell, and a lighting system using a backlight or a reflecting plate can be formed.
- the optical film by this invention can be installed in the one side or both sides of display panels, such as a liquid crystal cell.
- optical films When optical films are provided on both sides, they may be the same or different.
- a single layer or a suitable part such as a diffusing plate, an antiglare layer, an antireflection film, a protective plate, a prism array, a lens array sheet, a light diffusing plate, a backlight, etc. Two or more layers can be arranged.
- organic electroluminescence device organic EL display device: OLED
- a transparent electrode, an organic light emitting layer, and a metal electrode are sequentially laminated on a transparent substrate to form a light emitter (organic electroluminescent light emitter).
- the organic light emitting layer is a laminate of various organic thin films, for example, a laminate of a hole injection layer made of a triphenylamine derivative and the like and a light emitting layer made of a fluorescent organic solid such as anthracene, Alternatively, a structure having various combinations such as a laminate of such a light-emitting layer and an electron injection layer made of a perylene derivative, or a stack of these hole injection layer, light-emitting layer, and electron injection layer is known. It has been.
- holes and electrons are injected into the organic light-emitting layer by applying a voltage to the transparent electrode and the metal electrode, and the energy generated by recombination of these holes and electrons excites the phosphor material. Then, light is emitted on the principle that the excited fluorescent material emits light when returning to the ground state.
- the mechanism of recombination in the middle is the same as that of a general diode, and as can be predicted from this, the current and the emission intensity show strong nonlinearity with rectification with respect to the applied voltage.
- an organic EL display device in order to extract light emitted from the organic light emitting layer, at least one of the electrodes must be transparent, and a transparent electrode usually formed of a transparent conductor such as indium tin oxide (ITO) is used as an anode. It is used as.
- ITO indium tin oxide
- metal electrodes such as Mg—Ag and Al—Li are used.
- the organic light emitting layer is formed of a very thin film having a thickness of about 10 nm. For this reason, the organic light emitting layer transmits light almost completely like the transparent electrode. As a result, light that is incident from the surface of the transparent substrate at the time of non-light emission, passes through the transparent electrode and the organic light emitting layer, and is reflected by the metal electrode is again emitted to the surface side of the transparent substrate.
- the display surface of the organic EL display device looks like a mirror surface.
- an organic EL display device comprising an organic electroluminescent light emitting device comprising a transparent electrode on the surface side of an organic light emitting layer that emits light upon application of a voltage and a metal electrode on the back side of the organic light emitting layer, the surface of the transparent electrode While providing a polarizing plate on the side, a retardation plate can be provided between the transparent electrode and the polarizing plate.
- the retardation plate and the polarizing plate have a function of polarizing light incident from the outside and reflected by the metal electrode, there is an effect that the mirror surface of the metal electrode is not visually recognized by the polarization action.
- the mirror surface of the metal electrode can be completely shielded by configuring the retardation plate with a quarter-wave plate and adjusting the angle formed by the polarization direction of the polarizing plate and the retardation plate to ⁇ / 4. .
- linearly polarized light becomes generally elliptically polarized light by the phase difference plate, but becomes circularly polarized light particularly when the phase difference plate is a quarter wavelength plate and the angle formed by the polarization direction of the polarizing plate and the phase difference plate is ⁇ / 4. .
- This circularly polarized light is transmitted through the transparent substrate, the transparent electrode, and the organic thin film, reflected by the metal electrode, is again transmitted through the organic thin film, the transparent electrode, and the transparent substrate, and becomes linearly polarized light again on the retardation plate. And since this linearly polarized light is orthogonal to the polarization direction of a polarizing plate, it cannot permeate
- Example 1 Preparation of water-dispersed pressure-sensitive adhesive composition
- 180 parts of butyl acrylate and 10 parts of cyclohexyl methacrylate were added and mixed to obtain a monomer mixture.
- a mixture of 10 parts of acrylic acid, 20 parts of a reactive surfactant, Aqualon HS-10 (Daiichi Kogyo Seiyaku Co., Ltd.) and 780 parts of ion-exchanged water was prepared and added to the monomer mixture.
- the monomer emulsion (A) was prepared by stirring at 6000 rpm for 5 minutes using a homomixer (made by Tokushu Kika Kogyo Co., Ltd.).
- the entire amount of the monomer emulsion (A) prepared above was charged into a reaction vessel equipped with a cooling tube, a nitrogen introduction tube, a thermometer, dripping equipment, and a stirring blade, and the reaction vessel was sufficiently substituted with nitrogen while stirring. Thereafter, the temperature of the reaction solution was raised to 65 ° C., 0.1 part of ammonium persulfate was added, and polymerization was carried out for 1 hour while maintaining 65 ° C. to obtain a copolymer to be a core layer.
- the monomer emulsion (B) is dropped over 3 hours, and then polymerized for 3 hours to form a shell layer, with a solid content of 39 %
- Aqueous dispersion containing core-shell structured polymer emulsion particles was obtained.
- 65 parts of 10% ammonia water is added to adjust the pH to 7.5, and the solid-shell concentration is 38%.
- a water-dispersed pressure-sensitive adhesive composition containing the following emulsion particles was obtained.
- the number average particle diameter of the obtained polymer emulsion particles was 110 nm.
- the number average particle diameter is a value measured by the following method. ⁇ Number average particle diameter> The number average particle size of the polymer emulsion particles was measured by diluting the prepared water-dispersed pressure-sensitive adhesive composition with distilled water so that the solid content concentration was 0.5% by weight or less, using the following apparatus. Apparatus: Laser diffraction scattering particle size distribution measuring apparatus (LS13 320 PIDS mode, manufactured by Beckman Coulter) Dispersoid refractive index: 1.48 (uses poly-n-butyl acrylate) Refractive index of dispersion medium: 1.333
- the above water-dispersed pressure-sensitive adhesive composition was applied to a release film (polyethylene terephthalate base, trade name: Diafoil MRF-38, manufactured by Mitsubishi Chemical Polyester Co., Ltd.) so that the thickness after drying was 25 ⁇ m. After coating with a coater, it was dried at 120 ° C. for 2 minutes to form an adhesive layer. When measuring the peel force, for the sake of convenience, it was transferred to a 38 ⁇ m thick polyethylene terephthalate substrate (PET # 38) that had been subjected to an easy adhesion treatment in advance, and used as an adhesive sheet (adhesive layer).
- PET # 38 polyethylene terephthalate substrate
- the pressure-sensitive adhesive layer formed on the release film is a polarizing plate (a protective film made of an acrylic resin having a thickness of 60 ⁇ m / a polarizer having a thickness of 20 ⁇ m / a protective film made of an acrylic resin having a thickness of 40 ⁇ m) of 40 ⁇ m.
- a polarizing plate a protective film made of an acrylic resin having a thickness of 60 ⁇ m / a polarizer having a thickness of 20 ⁇ m / a protective film made of an acrylic resin having a thickness of 40 ⁇ m
- Comparative Examples 1 to 6 A water-dispersed pressure-sensitive adhesive composition, a pressure-sensitive adhesive sheet (pressure-sensitive adhesive layer), and a pressure-sensitive adhesive optical film were prepared in the same manner as in Example 1 except that the compositions of the core layer and shell layer were changed to the compositions shown in Table 1.
- PEG500 polyethylene glycol, molecular weight: 500
- Comparative Example 3 the oxazoline group-containing polymer (trade name: EPOCROSS WS700, Japan Co., Ltd.) is 2% by weight based on the total solid content of the polymer emulsion particles contained in the obtained water-dispersed pressure-sensitive adhesive composition. Catalyst) was added.
- composition (wt%) of the core layer in Table 1 indicates the blending ratio with respect to all monomer components constituting the core layer
- the composition (wt%) of the shell layer represents the total monomer constituting the shell layer. The compounding ratio with respect to a component is shown.
- the glass transition temperature of the (meth) acrylic copolymer constituting the core layer and the shell layer obtained in Examples and Comparative Examples is also described.
- the glass transition temperature is a theoretical value calculated by the following method.
- the glass transition temperature of the (meth) acrylic copolymer constituting the core layer and the shell layer of the emulsion particles contained in the water-dispersed pressure-sensitive adhesive composition obtained in each example is the homopolymer of each monomer shown below.
- the glass transition temperature Tg (K) was used to calculate the following FOX equation.
- ⁇ Peeling force> The adhesive layer (25 ⁇ m) on the release film obtained in each Example and Comparative Example was applied to a 38 ⁇ m-thick polyethylene terephthalate (PET) substrate that had been subjected to an easy adhesion treatment in advance, and an adhesive sheet for measuring peel force (Peeling film / adhesive layer / PET substrate) was prepared. The obtained adhesive sheet was cut into a width of 25 mm and a length of 180 mm to prepare a sample for measuring peel force.
- PET polyethylene terephthalate
- the release film was peeled off from the sample, and the pressure-sensitive adhesive layer of the sample was pressure-bonded to a non-alkali glass plate (Corning Eagle XG, manufactured by Corning Co., Ltd.) in one reciprocation of a 2 kg roller, and further 15 It was autoclaved (50 ° C., 0.5 MPa) for 5 minutes, and then allowed to stand at 23 ° C. for 30 minutes. Thereafter, using a peeling tester, the sample was removed at 23 ° C., at a peeling angle of 180 °, and at a peeling speed (0.005 m / min, 0.5 m / min, 1.5 m / min, 2.5 m / min).
- the peeling force (N / 25 mm) at the time of peeling was measured.
- a high-speed peeling tester manufactured by Koken Co., Ltd.
- FIG. 1 shows the relationship between the peeling speed and the peeling force.
- the pressure-sensitive adhesive optical film obtained by laminating the pressure-sensitive adhesive layers obtained in each Example and Comparative Example was cut into a 15-inch size, which was attached to a non-alkali glass (EAGLE XG) having a thickness of 0.7 mm, and 50 ° C. And left in a 0.5 MPa autoclave for 15 minutes. Thereafter, after treatment in an environment of 60 ° C. and 90% RH for 500 hours, immediately after taking out to room temperature conditions (23 ° C., 55% RH), the peeling between the treated pressure-sensitive adhesive optical film and the non-alkali glass is removed. The degree was visually confirmed and evaluated according to the following criteria. 5: No peeling occurred.
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Abstract
Description
前記(メタ)アクリル系共重合体(B)のガラス転移温度が-10℃以上20℃以下であることを特徴とする水分散型粘着剤組成物に関する。本発明の水分散型粘着剤組成物は、光学フィルム用途に有用である。
前記(メタ)アクリル系共重合体(B)のガラス転移温度(Tg)が-10℃以上20℃以下であることを特徴とするものである。
FOXの式:
容器に原料として、アクリル酸ブチル180部、メタクリル酸シクロヘキシル10部を加えて混合したモノマー混合物を得た。次いで、アクリル酸10部、反応性界面活性剤であるアクアロンHS-10(第一工業製薬(株)製)20部、イオン交換水780部の混合物を作製し、前記モノマー混合物に加えた後、ホモミキサー(特殊機化工業(株)製)を用いて5分間、6000rpmで撹拌し、モノマーエマルション(A)を調整した。
<数平均粒子径>
ポリマーエマルション粒子の数平均粒子径は、調製した水分散型粘着剤組成物を蒸留水により固形分濃度が0.5重量%以下となるように希釈して下記装置にて測定した。
装置:レーザー回折散乱法粒度分布測定装置(ベックマンコールター製 LS13 320 PIDSモード)
分散質の屈折率:1.48(ポリ-n-アクリル酸ブチルを使用)
分散媒の屈折率:1.333
上記水分散型粘着剤組成物を、乾燥後の厚みが25μmとなるように、離型フィルム(ポリエチレンテレフタレート基材、商品名:ダイアホイルMRF-38、三菱化学ポリエステル(株)製)上にダイコーターにより塗布した後、120℃で2分間乾燥して粘着剤層を形成した。なお、剥離力測定の際は便宜上、予め易接着処理を施した厚さ38μmのポリエチレンテレフタレート基材(PET#38)に転写し、粘着シート(粘着剤層)とした。
上記離型フィルムに形成した粘着剤層を、偏光板(厚さ60μmのアクリル系樹脂からなる保護フィルム/厚さ20μmの偏光子/厚さ40μmのアクリル系樹脂からなる保護フィルム)の厚さ40μmのアクリル系樹脂からなる保護フィルム上に、貼り合わせて、粘着型光学フィルムを作製した。
コア層、シェル層の組成を表1に示す組成にした以外は、実施例1と同様にして、水分散型粘着剤組成物、粘着シート(粘着剤層)及び粘着型光学フィルムを作製した。なお、比較例2においては、得られた水分散型粘着剤組成物に含まれるポリマーエマルション粒子の固形分全量に対して5重量%となるようにPEG500(ポリエチレングリコール、分子量:500)を添加し、比較例3においては、得られた水分散型粘着剤組成物に含まれるポリマーエマルション粒子の固形分全量に対して2重量%となるオキサゾリン基含有ポリマー(商品名:エポクロスWS700、(株)日本触媒製)を添加した。
各実施例で得られた水分散型粘着剤組成物に含まれるエマルション粒子のコア層、シェル層を構成する(メタ)アクリル系共重合体のガラス転移温度は、以下に示す各モノマーのホモポリマーのガラス転移温度Tg(K)を用い、下記FOXの式で算出した。
BA:アクリル酸ブチル=228.15K
AA:アクリル酸=379.15K
2EHA:アクリル酸2-エチルヘキシル=218.15K
CHMA:メタクリル酸シクロヘキシル=339.15K
MMA:メタクリル酸メチル=378.15K
FOXの式:
各実施例及び比較例で得られた剥離フィルム上の粘着剤層(25μm)に、予め易接着処理を施した厚さ38μmのポリエチレンテレフタレート(PET)基材に貼付し、剥離力測定用粘着シート(剥離フィルム/粘着剤層/PET基材)を作製した。得られた粘着シートを、幅25mm、長さ180mmに切断し、剥離力測定用サンプルを作製した。前記サンプルから、剥離フィルムを剥がし、23℃の雰囲気下で、前記サンプルの粘着剤層を無アルカリガラス板(コーニングイーグルXG、コーニング(株)製)に2kgローラーの1往復で圧着し、さらに15分間オートクレーブ処理(50℃、0.5MPa)を行い、その後23℃で30分放置した。その後、剥離試験機を用いて、23℃下、剥離角度180°、剥離速度(0.005m/分、0.5m/分、1.5m/分、2.5m/分)にて、サンプルを剥離する際の剥離力(N/25mm)を測定した。なお、剥離速が1.5m/分以上の場合には、剥離試験機として試験機高速剥離試験器((株)工研製の高低温ハクリ試験機)を用いた。また、図1に、剥離速度と剥離力の関係を示す。
各実施例及び比較例で得られた離型フィルムに設けた厚さ25μmの粘着剤層を、50mm×50mmに切断した後、粘着剤層を離型フィルムから剥離して、23℃の雰囲気下で(株)村上色彩技術研究所製の「HAZEMETER HM-150型」を用いて、JIS K-7136に準じて、ヘイズ値(%)を測定した。
各実施例及び比較例で得られた粘着剤層を積層した粘着型光学フィルムを15インチサイズに切断し、これを厚さ0.7mmの無アルカリ硝子(EAGLE XG)に貼着し、50℃、0.5MPaのオートクレーブ中に15分間放置した。その後、60℃、90%RHの環境下に500時間処理した後、室温条件(23℃、55%RH)に取出した直後に、処理された粘着型光学フィルムと無アルカリ硝子の間のハガレの度合いを目視で確認し、下記基準で評価した。
5:ハガレの発生なし
4:粘着型光学フィルムの端部から0.5mm以内の箇所までハガレが発生している。
3:粘着型光学フィルムの端部から1.0mm以内の箇所までハガレが発生している。
2:粘着型光学フィルムの端部から3.0mm以内の箇所までハガレが発生している。
1:粘着型光学フィルムの端部から3.0mmを超える箇所までハガレが発生している。
Claims (10)
- 同一エマルション粒子内に、(メタ)アクリル系共重合体(A)がコア層、(メタ)アクリル系共重合体(B)がシェル層として存在する、コアシェル構造のエマルション粒子を含有する水分散型粘着剤組成物であって、
前記(メタ)アクリル系共重合体(B)のガラス転移温度が-10℃以上20℃以下であることを特徴とする水分散型粘着剤組成物。 - 前記エマルション粒子のガラス転移温度が、-25~15℃であることを特徴とする請求項1に記載の水分散型粘着剤組成物。
- 前記(メタ)アクリル系共重合体(A)のガラス転移温度が、0℃未満であることを特徴とする、請求項1又は2に記載の水分散型粘着剤組成物。
- 前記(メタ)アクリル系共重合体(A)のガラス転移温度が、(メタ)アクリル系共重合体(B)のガラス転移温度よりも低いことを特徴とする、請求項1~3のいずれかに記載の水分散型粘着剤組成物。
- 前記(メタ)アクリル系共重合体(A)及び(メタ)アクリル系共重合体(B)のいずれもが、(メタ)アクリル酸アルキルエステル及びカルボキシル基含有モノマーを含むモノマー成分を乳化重合することにより得られるものであり、前記カルボキシル基含有モノマーの配合割合が前記モノマー成分に対して0.1~8重量%であることを特徴とする請求項1~4のいずれかに記載の水分散型粘着剤組成物。
- 請求項1~5のいずれかに記載の水分散型粘着剤組成物から形成されることを特徴とする粘着剤層。
- 前記粘着剤層をガラスに貼り合わせた後、23℃の雰囲気下、180°方向に、剥離速度0.5m/分、1.5m/分、2.5m/分で剥離する際の剥離力が、いずれも、23℃の雰囲気下、180°方向に、剥離速度0.005m/分で剥離する際の剥離力以下であることを特徴とする請求項6に記載の粘着剤層。
- 前記粘着剤層をガラスに貼り合わせた後、23℃の雰囲気下、180°方向に、剥離速度0.5m/分、1.5m/分、2.5m/分で剥離する際の剥離力が、いずれも、5N/25mm以下であることを特徴とする請求項6又は7に記載の粘着剤層。
- 光学フィルムの少なくとも片面に、請求項6~8のいずれかに記載の粘着剤層が積層されていることを特徴とする粘着型光学フィルム。
- 請求項9に記載の粘着型光学フィルムを備えることを特徴とする画像表示装置。
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JP6850093B2 (ja) * | 2016-09-05 | 2021-03-31 | 日東電工株式会社 | 加圧接着型粘着部材 |
KR102373703B1 (ko) * | 2020-06-30 | 2022-03-11 | 최소영 | 수용성 점착제의 제조방법 |
JP2022042364A (ja) * | 2020-09-02 | 2022-03-14 | 富士フイルムビジネスイノベーション株式会社 | 圧力応答性粒子、カートリッジ、印刷物の製造装置、印刷物の製造方法、印刷物、印刷物製造用シート、及び印刷物製造用シートの製造方法 |
KR102671572B1 (ko) * | 2022-06-29 | 2024-06-04 | 주식회사 켐코 | 저탄소 배출 공정을 이용하여 제조되는 친환경 점착제 수지, 이를 포함하는 점착제 조성물 및 이를 이용하여 형성된 점착제층 |
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CN105518097A (zh) | 2016-04-20 |
JP2015052060A (ja) | 2015-03-19 |
US20160215182A1 (en) | 2016-07-28 |
KR20160052535A (ko) | 2016-05-12 |
TW201512354A (zh) | 2015-04-01 |
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