WO2018043624A1 - 水分散液型アクリル系粘着剤組成物 - Google Patents
水分散液型アクリル系粘着剤組成物 Download PDFInfo
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- WO2018043624A1 WO2018043624A1 PCT/JP2017/031289 JP2017031289W WO2018043624A1 WO 2018043624 A1 WO2018043624 A1 WO 2018043624A1 JP 2017031289 W JP2017031289 W JP 2017031289W WO 2018043624 A1 WO2018043624 A1 WO 2018043624A1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- 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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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- 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
- C09J133/12—Homopolymers or copolymers of methyl methacrylate
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
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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
- C08F20/00—Homopolymers and 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
- C08F20/02—Monocarboxylic acids having less than ten carbon atoms, Derivatives thereof
- C08F20/10—Esters
- C08F20/12—Esters of monohydric alcohols or phenols
- C08F20/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F20/18—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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- 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
- C08F2500/00—Characteristics or properties of obtained polyolefins; Use thereof
- C08F2500/24—Polymer with special particle form or size
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
- C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/40—Adhesives in the form of films or foils characterised by release liners
Definitions
- the present invention relates to an aqueous dispersion type acrylic pressure-sensitive adhesive composition and a pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive composition.
- a pressure-sensitive adhesive is in the form of a soft solid (viscoelastic body) in a temperature range near room temperature and has a property of easily adhering to an adherend by pressure.
- the pressure-sensitive adhesive is widely used in various fields, for example, in the form of a pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer formed in a film shape.
- a typical method for forming the pressure-sensitive adhesive layer a method in which a pressure-sensitive adhesive composition containing a pressure-sensitive adhesive component in a liquid medium is applied to an appropriate surface and dried is exemplified.
- an aqueous dispersion-type pressure-sensitive adhesive composition in which pressure-sensitive adhesive particles are dispersed in an aqueous medium is preferred compared to a solvent-type pressure-sensitive adhesive composition in which a pressure-sensitive adhesive component is dissolved in an organic solvent.
- aqueous dispersion-type pressure-sensitive adhesive composition for example, an aqueous dispersion-type pressure-sensitive adhesive in which core-shell (meth) acrylic copolymer particles comprising a core layer and a shell layer covering the core layer are dispersed in an aqueous medium.
- Compositions are known (Patent Documents 1 and 2).
- acrylic adhesives have a strong tack, so that once they touch the adherend, a high adhesive force is expressed. For this reason, the pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer formed of an acrylic pressure-sensitive adhesive can be aligned with the adherend and reattached (reworked) while in contact with the adherend. It was difficult.
- an acrylic pressure-sensitive adhesive has a higher adhesion to a metal such as stainless steel (SUS) having a higher polarity than plastics such as acrylic resin and polypropylene (PP).
- an adherend is selectively adhered to a plastic part of a metal and plastic composite material such as SUS (that is, a material having a metal region (part) such as SUS and a plastic region (part) on the surface). It was difficult.
- Another object of the present invention is to provide a novel acrylic pressure-sensitive adhesive composition capable of forming a pressure-sensitive adhesive layer (pressure-sensitive adhesive sheet) that can be re-applied (reworked) to an adherend.
- Another object of the present invention is to provide a novel acrylic pressure-sensitive adhesive composition that can selectively adhere to a plastic region (part) to an adherend composed of a composite material of a metal such as SUS and plastic.
- a core-shell structure acrylic copolymer is used in an aqueous dispersion type acrylic pressure-sensitive adhesive composition containing core-shell structure acrylic copolymer particles as a dispersoid.
- a core-shell structure acrylic copolymer is used.
- the pressure-sensitive adhesive layer made of a solidified dispersion-type acrylic pressure-sensitive adhesive composition has a weak tack, makes it difficult to develop an adhesive force by simply touching the adherend, and SUS or the like by applying pressure.
- the present inventors have found that the metal can be bonded to a plastic with a higher adhesive force than other metals, and have further advanced research based on the knowledge, thereby completing the present invention. That is, the features of the present invention are as follows.
- a dispersion type acrylic pressure-sensitive adhesive composition The glass transition temperature of the acrylic polymer (B) is 30 ° C. or higher, and the glass transition temperature of the acrylic polymer (A) is lower than the glass transition temperature of the acrylic polymer (B).
- An aqueous dispersion-type acrylic pressure-sensitive adhesive composition characterized by the above.
- the content ratio ((A) / (B)) of the acrylic polymer (A) to the acrylic polymer (B) in the core-shell structure acrylic copolymer particles is 50/50 to 90/10 (
- the content ratio ((A) / (B)) of the acrylic polymer (A) to the acrylic polymer (B) in the core-shell structure acrylic copolymer particles is 60/40 to 80/20 (weight)
- the pressure-sensitive adhesive layer (pressure-sensitive adhesive sheet) formed from the aqueous dispersion type acrylic pressure-sensitive adhesive composition of the present invention does not exhibit high adhesive force to the adherend simply by touching the adherend, and the adherend It exhibits low friction that can be moved even when in contact with the surface. For this reason, it can be easily moved even in a state of being in contact with the adherend, and can be aligned with the adherend in a state of being in contact with the adherend. Moreover, since high adhesive force is not expressed with respect to a to-be-adhered body only by touching a to-be-adhered body, it can re-apply (rework) on an to-be-adhered body.
- the pressure-sensitive adhesive layer (pressure-sensitive adhesive sheet) formed from the aqueous dispersion type acrylic pressure-sensitive adhesive composition of the present invention has a plastic region (partial) on an adherend composed of a composite material of a metal material such as SUS and plastic. ) Can be selectively bonded with high adhesive strength.
- the numerical range defined using the symbol “ ⁇ ” includes the numerical values at both ends (upper limit and lower limit) of “ ⁇ ”.
- “0.01 to 5” represents 0.01 or more and 5 or less.
- “(meth) acryl” means both “acryl” and “methacryl”
- “(meth) acrylate” means both “acrylate” and “methacrylate”.
- the “aqueous dispersion” means a dispersion in which the dispersion medium is an aqueous medium.
- C xy represents a range of carbon numbers, and means that the number of carbons is x or more and y or less.
- (meth) acrylic acid C xy alkyl ester” means “(meth) acrylic acid alkyl ester in which the alkyl group has from xy to carbon atoms”.
- the aqueous dispersion type acrylic pressure-sensitive adhesive composition of the present invention (hereinafter sometimes simply referred to as “pressure-sensitive adhesive composition”) has a core layer (A) containing an acrylic polymer (A) and a shell layer ( B) is an aqueous dispersion type acrylic pressure-sensitive adhesive composition in which core-shell structure acrylic copolymer particles containing an acrylic polymer (B) are dispersed in an aqueous medium, and the glass transition of the acrylic polymer (B).
- the main characteristics are that the temperature is 30 ° C. or higher, and the glass transition temperature of the acrylic polymer (A) is lower than the glass transition temperature of the acrylic polymer (B).
- Acrylic copolymer (B1) that is methyl acid is preferable. Specifically, acrylic copolymer (B1-1) containing methyl methacrylate and a carboxy group-containing monomer as monomer units, methyl methacrylate, carboxy And an acrylic copolymer (B1-2) containing a group-containing monomer and a (meth) acrylic acid C 2-14 alkyl ester as monomer units.
- the carboxy group-containing monomer is not particularly limited, and examples thereof include (meth) acrylic acid, carboxyethyl (meth) acrylate, carboxypentyl (meth) acrylate, itaconic acid, maleic acid, fumaric acid, and crotonic acid. .
- acrylic acid and / or methacrylic acid are preferable, and more preferably acrylic acid and methacrylic acid are used in combination.
- the quantity ratio is although it does not specifically limit, It is preferable that it is substantially the same quantity.
- a carboxy group containing monomer can use 1 type (s) or 2 or more types.
- the alkyl group having 2 to 14 carbon atoms may be linear or branched.
- methyl (meth) acrylate Ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, s-butyl (meth) acrylate, (meth) T-butyl acrylate, pentyl (meth) acrylate, isopentyl (meth) acrylate, hexyl (meth) acrylate, heptyl (meth) acrylate, octyl (meth) acrylate, cyclohexyl (meth) acrylate, (meth ) 2-ethylhexyl acrylate, isooctyl (meth) acrylate,
- the acrylic copolymer (B1) preferably contains 50 to 99% by weight, more preferably 60 to 90% by weight, and more preferably 60 to 70% by weight of methyl methacrylate in all monomer units. Is particularly preferred.
- the composition of the acrylic copolymer (B1-1) containing methyl methacrylate and a carboxy group-containing monomer as a monomer unit is preferably 80 to 99:20 to 1 in terms of methyl methacrylate: carboxy group-containing monomer (weight ratio). 80 to 95:20 to 5 is more preferable, and 85 to 95:15 to 5 is particularly preferable.
- the composition of the acrylic copolymer (B1-2) containing methyl methacrylate, a carboxy group-containing monomer and (meth) acrylic acid C 2-14 alkyl ester as a monomer unit is methyl methacrylate: carboxy group-containing monomer.
- (Meth) acrylic acid C 2-14 alkyl ester (weight ratio) is preferably 50 to 98: 1 to 20: 1 to 30 (provided that the total weight of the three components is 100), and 60 to 90: 5 to 20 : 5 to 20 (however, the total weight of the three components is 100) is more preferable.
- Acrylic copolymers (B1) and (B1-1) each contain a methacrylic acid C 2-18 alkyl ester or a hydroxy group-containing monomer as a monomer unit within a range of 10% by weight or less of the total monomer units. It can contain as.
- the acrylic copolymer (B1-2) can contain a methacrylic acid C 15-18 alkyl ester or a hydroxy group-containing monomer as a monomer unit within a range of 10% by weight or less based on the total monomer units. .
- hydroxy group-containing monomer examples include hydroxyethyl (meth) acrylate, hydroxybutyl (meth) acrylate, hydroxyhexyl (meth) acrylate, hydroxyoctyl (meth) acrylate, hydroxydecyl (meth) acrylate, ( Examples thereof include hydroxy lauryl methacrylate and (4-hydroxymethylcyclohexyl) methyl methacrylate.
- the glass transition temperature (° C.) of the acrylic polymer (B) having a glass transition temperature of 30 ° C. or higher is calculated from the following FOX formula from the monomer units constituting the acrylic polymer (B) and the ratio thereof.
- the theoretical glass transition temperature (K) calculated by the above equation is converted to a Celsius temperature (° C.).
- the theoretical glass transition temperature (converted to Celsius temperature (° C.)) 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 acrylic polymer (B) forming the shell layer (B) of the core-shell structure acrylic copolymer particles has a glass transition temperature of 30 ° C. or higher, so that a solidified product of the aqueous dispersion type acrylic pressure-sensitive adhesive composition is obtained.
- the tackiness of the (adhesive layer) is weak, and it is difficult to develop an adhesive force only by lightly touching the adherend.
- the glass transition temperature of the acrylic polymer (B) is preferably 35 ° C. or higher, more preferably 38 ° C. or higher, and particularly preferably 55 ° C. or higher.
- the upper limit of the glass transition temperature of the acrylic polymer (B) is not particularly limited, but if the glass transition temperature is too high, an adherend of the solidified product (adhesive layer) of the aqueous dispersion type acrylic adhesive composition Therefore, the glass transition temperature of the acrylic polymer (B) is preferably 110 ° C. or lower, more preferably 80 ° C. or lower, and particularly preferably 60 ° C. or lower.
- the acrylic polymer (A) that forms the core layer (A) of the core-shell structure acrylic copolymer particles is an acrylic polymer whose glass transition temperature is lower than the glass transition temperature of the acrylic polymer (B). is there.
- the “glass transition temperature of the acrylic polymer (A)” referred to here is the theoretical glass transition temperature (K) calculated from the monomer unit constituting the acrylic polymer (A) and the ratio thereof by the FOX equation. ) Converted to Celsius temperature (° C.).
- Such an acrylic polymer (A) preferably contains, for example, one or more selected from (meth) acrylic acid C 1-14 alkyl ester as a main monomer unit, and the above FOX formula Examples thereof include homopolymers or copolymers in which the glass transition temperature (converted to Celsius temperature (° C.)) calculated from the above is lower than the glass transition temperature of the acrylic polymer (B).
- Examples of (meth) acrylic acid C 1-14 alkyl esters include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, and (meth) acrylic acid n.
- the (meth) acrylic acid C 1-14 alkyl ester is preferably an acrylic acid C 1-14 alkyl ester, more preferably an acrylic acid C 1-10 alkyl ester, and an acrylic acid C 2-8 alkyl ester. It is even more preferred that C 4-8 alkyl ester of acrylic acid is particularly preferred.
- the homopolymer or copolymer in which the main monomer unit is composed of one or more selected from (meth) acrylic acid C 1-14 alkyl ester has a glass transition temperature of glass of acrylic polymer (B) As long as it becomes lower than the transition temperature, it may be a copolymer further containing a carboxy group-containing monomer or a hydroxy group-containing monomer as a monomer unit.
- Specific examples of the “carboxy group-containing monomer” and “hydroxy group-containing monomer” herein include those exemplified as the monomer unit of the above-mentioned acrylic polymer (B).
- the glass transition temperature of the acrylic polymer (A) forming the core layer (A) is preferably less than 0 ° C, more preferably -50 ° C or less.
- the acrylic resin or polypropylene of the solidified product (adhesive layer) of the aqueous dispersion type acrylic adhesive composition Adhesive strength to plastic such as (PP) is improved.
- the lower limit of the glass transition temperature of the acrylic polymer (A) is not particularly limited, but the glass transition temperature of the acrylic polymer (A) is a monomer unit in order to favorably proceed the polymerization in an aqueous medium. It is preferable that the temperature is ⁇ 80 ° C. or higher, including a polymer containing acrylic acid C 1-10 alkyl ester.
- acrylic polymer (A) examples include n-butyl acrylate (BA) homopolymer, n-hexyl acrylate (HA) homopolymer, 2-ethylhexyl acrylate (2HEA) homopolymer. , Copolymers having two or more selected from BA, HA and 2EHA as monomer units.
- BA n-butyl acrylate
- HA n-hexyl acrylate
- 2HEA 2-ethylhexyl acrylate
- the content ratio ((A) / (B)) of the acrylic polymer (A) to the acrylic polymer (B) in the core-shell structure acrylic copolymer particles is 50/50 to 90/10 (weight ratio). It is preferably 60/40 to 90/10, particularly preferably 70/30 to 85/15.
- the content ratio ((A) / (B)) of the acrylic polymer (A) and the acrylic polymer (B) exceeds the preferable range, the amount of the acrylic polymer (A) is large.
- the solidified product of the aqueous dispersion type acrylic pressure-sensitive adhesive composition Tends to increase the frictional force against the adherend.
- the ratio of the acrylic polymer (B) is large, the friction force against the adherend of the solidified product (adhesive layer) of the aqueous dispersion type acrylic adhesive composition tends to decrease. Adhesiveness to adherends of various materials other than plastic tends to decrease.
- the number average particle diameter of the core-shell structure acrylic polymer particles as the dispersoid is preferably 100 to 400 nm, and more preferably 140 to 320 nm.
- the number average particle size is less than 100 nm, the amount of surfactant used is usually increased, resulting in a decrease in the adhesive strength of the solidified product (adhesive layer) of the aqueous dispersion type acrylic adhesive composition.
- the number average particle diameter exceeds 400 nm, the number of particles in which the shell layer cannot cover the core layer increases, so the solidified product (adhesive layer) of the aqueous dispersion type acrylic adhesive composition is deposited. In addition to a tendency to increase the frictional force against the body, the selective adhesion to plastic tends to decrease.
- the target adherend in contact with the adherend is desired. It is possible to more stably obtain a pressure-sensitive adhesive layer that can be aligned and reattached to the adherend (rework), and a pressure-sensitive adhesive layer that is excellent in selective adhesion to plastic.
- the particle diameter distribution of the core-shell structure acrylic polymer particles referred to here means that the number of peaks in the particle diameter distribution is one.
- the core-shell structure acrylic copolymer particles preferably have a sol weight average molecular weight (Mw) of 1.0 ⁇ 10 4 to 8.0 ⁇ 10 5 , and 1.0 ⁇ 10 5 to 5.0 ⁇ 10 5. More preferred is 1.9 ⁇ 10 5 to 3.0 ⁇ 10 5 .
- Mw sol weight average molecular weight
- the sol weight average molecular weight (Mw) is less than 1.0 ⁇ 10 4 , the frictional force is increased, and adhesive residue at the time of peeling tends to be generated, and the weight average molecular weight (Mw) is 8.0 ⁇ . If it exceeds 10 5 , even if pressure is applied, it tends to be difficult to develop adhesiveness.
- the sol weight average molecular weight (Mw) is the weight average molecular weight (Mw) of the sol part in the core-shell structure acrylic copolymer particles, and the measurement is soluble in the ethyl acetate of the core-shell structure acrylic polymer particles.
- the minute is obtained by polystyrene conversion by GPC (Gel Permeation Chromatography) method. Specifically, two “TSKgelGMH-H (20)” columns are connected to a liquid chromatograph “HPLC8020” manufactured by Tosoh Corporation and measured with a tetrahydrofuran solvent at a flow rate of 0.5 ml / min. Is done.
- the aqueous dispersion-type acrylic pressure-sensitive adhesive composition of the present invention performs emulsion polymerization to produce a core polymer of core-shell structure acrylic copolymer particles, and in the presence of the produced core polymer. It can be obtained by performing multi-stage emulsion polymerization, in which emulsion polymerization is performed to form a shell polymer. Each emulsion polymerization can be performed by a conventional method.
- an emulsifier (surfactant), a radical polymerization initiator, and a chain transfer agent are appropriately blended together with a monomer that is a monomer unit of a polymer serving as a core, and a batch charging method (batch polymerization method), monomer Emulsion polymerization is performed by a known emulsion polymerization method such as a dropping method or a monomer emulsion dropping method, and then an emulsifier (surfactant), a radical polymerization initiator, and a monomer that becomes a monomer unit of a polymer that becomes a shell, if necessary.
- a known emulsion polymerization method such as a dropping method or a monomer emulsion dropping method
- a chain transfer agent or the like is appropriately blended, and emulsion polymerization is performed by a known emulsion polymerization method such as a batch charging method (batch polymerization method), a monomer dropping method, a monomer emulsion dropping method or the like.
- a known emulsion polymerization method such as a batch charging method (batch polymerization method), a monomer dropping method, a monomer emulsion dropping method or the like.
- the monomer dropping method continuous dropping or divided dropping is appropriately selected.
- the reaction conditions for emulsion polymerization for obtaining a core polymer and the reaction conditions for emulsion polymerization for obtaining a shell polymer are each appropriately selected.
- the polymerization temperature is For example, the temperature is preferably about 40 to 95 ° C., and the polymerization time is preferably about 30 minutes to 24 hours.
- non-reactive surfactants usually used for emulsion polymerization
- non-reactive surfactant for example, an anionic non-reactive surfactant and a nonionic non-reactive surfactant are used.
- anionic non-reactive surfactants include higher fatty acid salts such as sodium oleate; alkyl aryl sulfonates such as sodium dodecylbenzene sulfonate; alkyl sulfate esters such as sodium lauryl sulfate and ammonium lauryl sulfate; Polyoxyethylene alkyl ether sulfates such as sodium ethylene lauryl ether sulfate; Polyoxyethylene alkyl aryl ether sulfates such as sodium polyoxyethylene nonylphenyl ether sulfate; Sodium monooctyl sulfosuccinate, sodium dioctyl sulfosuccinate, polyoxy Alkylsulfosuccinic acid ester salts such as sodium ethylene lauryl sulfosuccinate and derivatives thereof; polyoxyethylene distyre It can be exemplified phenyl ether sulfate ester such
- nonionic non-reactive surfactants include polyoxyethylene alkyl ethers such as polyoxyethylene lauryl ether and polyoxyethylene stearyl ether; polyoxyethylene octyl phenyl ether, polyoxyethylene nonyl phenyl ether and other polyoxyethylene alkyl ethers.
- a reactive surfactant having an ethylenically unsaturated double bond can be used as the surfactant.
- the reactive surfactant include an anionic reactive surfactant obtained by introducing a radical polymerizable functional group such as a propenyl group or an allyl ether group into the anionic non-reactive surfactant, and the nonionic non-reactive interface.
- Nonionic reactive surfactants in which radical polymerizable functional groups such as propenyl groups and allyl ether groups are introduced into the activator are listed.
- anionic reactive surfactants include alkyl ethers (commercially available products include, for example, Aqualon KH-05, KH-10, KH-20, manufactured by Daiichi Kogyo Seiyaku Co., Ltd., and ADEKA rear manufactured by ADEKA Corporation. Soap SR-10N, SR-20N, LATEMUL PD-104, etc.
- sulfosuccinic acid ester type for example, LATEMUL S-120, S-120A, S-180P, S, manufactured by Kao Corporation
- alkylphenyl ethers or alkylphenyl esters commercially available products include, for example, Aqualon H-2855A, H-3855B, H- 3855C, H-3856, HS-05, HS-10, HS-20, HS-30, HS 1025, BC-05, BC-10, BC-20, Adeka Soap SDX-222, SDX-223, SDX-232, SDX-233, SDX-259, SE-10N, SE-20N manufactured by ADEAKA); (Meth) acrylate sulfate ester (commercially available products include, for example, Antox MS-60, MS-2N manufactured by Nippon Emulsifier Co., Ltd., Eleminol
- Nonionic reactive surfactants include, for example, alkyl ethers (commercially available products include, for example, Adeka Soap ER-10, ER-20, ER-30, ER-40, manufactured by ADEAKA, LATEMUL manufactured by Kao Corporation, etc. PD-420, PD-430, PD-450, etc.); alkyl phenyl ethers or alkyl phenyl esters (commercially available products include, for example, Aqualon RN-10, RN-20, RN-30 manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.) , RN-50, Adeka Soap NE-10, NE-20, NE-30, NE-40, etc. manufactured by ADEAKA Corporation; (meth) acrylate sulfate ester (commercially available products include, for example, Nippon Emulsifier Co., Ltd. RMA-564, RMA-568, RMA-1114, etc.).
- the emulsifier is preferably a reactive surfactant, more preferably an anionic reactive surfactant, and particularly preferably an alkylphenyl ether-based or alkylphenyl ester-based reactive surfactant.
- Emulsifiers can be used alone or in combination of two or more.
- 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 (AIBN) 2,2′-azobis (2-methylpropionamidine) disulfate
- Azo initiators such as 2,2′-azobis (2-amidinopropane) dihydrochloride, 2,2′-azobis [2- (2-imidazolin-2-yl) propane] dihydrochloride
- Persulfate initiators such as potassium sulfate and ammonium persulfate
- peroxide initiators such as benzoyl peroxide, t-butyl hydroperoxide and hydrogen peroxide
- substituted ethane initiators such as phenyl substituted ethane Agents
- 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 composition of the monomer emulsion in the emulsion polymerization for obtaining the aqueous dispersion type acrylic pressure-sensitive adhesive composition of the present invention is 0.1 to 10 parts by weight (preferably 1 to 5 parts by weight) of the surfactant per 100 parts by weight of the monomer. Part), and a composition containing 100 to 400 parts by weight (preferably 100 to 300 parts by weight) of water is preferable.
- the amounts of “surfactant” and “water” referred to here are the total of the monomer emulsion to be dropped and the one charged in the polymerization reaction vessel, respectively, when the emulsion polymerization is a monomer emulsion dropping method. Amount.
- the aqueous dispersion type acrylic pressure-sensitive adhesive composition obtained by emulsion polymerization is dispersed in water when an aqueous dispersion type acrylic pressure-sensitive adhesive composition is applied (coated) to a substrate to form a pressure-sensitive adhesive layer.
- the aqueous dispersion type acrylic pressure-sensitive adhesive composition may include a general crosslinking agent such as a carbodiimide crosslinking agent, a hydrazine crosslinking agent, an epoxy crosslinking agent, an isocyanate crosslinking agent, or an oxazoline crosslinking agent, if necessary.
- a general crosslinking agent such as a carbodiimide crosslinking agent, a hydrazine crosslinking agent, an epoxy crosslinking agent, an isocyanate crosslinking agent, or an oxazoline crosslinking agent, if necessary.
- tackifiers examples include rosin resins, rosin derivative resins (polymerized rosin esters, etc.), petroleum resins, terpene resins, phenol resins, ketone resins, and the like.
- the aqueous dispersion type acrylic pressure-sensitive adhesive composition of the present invention is a composition which does not substantially contain a crosslinking agent.
- the present invention also provides a pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer formed from the aqueous dispersion type acrylic pressure-sensitive adhesive composition. It may be a pressure-sensitive adhesive sheet with a base material having a pressure-sensitive adhesive layer on one side or both sides of the support, or may be a base-less pressure-sensitive adhesive sheet in a form in which the pressure-sensitive adhesive layer is held by a release liner.
- the concept of the pressure-sensitive adhesive sheet herein may include what are called pressure-sensitive adhesive tapes, pressure-sensitive adhesive labels, pressure-sensitive adhesive films and the like.
- the pressure-sensitive adhesive layer is typically formed continuously, but is not limited to such a form.
- the pressure-sensitive adhesive layer is formed in a regular or random pattern such as a dot shape or a stripe shape. It may be.
- the pressure-sensitive adhesive sheet provided by the present invention may be in the form of a roll or a single sheet. Or the adhesive sheet of the form processed into various shapes may be sufficient.
- the pressure-sensitive adhesive sheet disclosed herein may have, for example, a cross-sectional structure schematically shown in FIGS.
- FIG. 1 FIG. 2 is a structural example of the adhesive sheet with a base material of a double-sided adhesive type.
- the pressure-sensitive adhesive sheet 1 shown in FIG. 1 is provided with pressure-sensitive adhesive layers 21 and 22 on each surface of the support 10 (both non-peelable), and these pressure-sensitive adhesive layers are at least on the pressure-sensitive adhesive layer side. It has the structure protected by the release liners 31 and 32 respectively.
- pressure-sensitive adhesive sheet 2 is provided with pressure-sensitive adhesive layers 21 and 22 on each surface of the support 10 (both are non-peelable), and one of the pressure-sensitive adhesive layers 21 has a release surface on both sides. It has a configuration protected by the release liner 31.
- This type of pressure-sensitive adhesive sheet 2 has a configuration in which the pressure-sensitive adhesive layer 22 is also protected by the release liner 31 by winding the pressure-sensitive adhesive sheet and bringing the other pressure-sensitive adhesive layer 22 into contact with the back surface of the release liner 31. be able to.
- the pressure-sensitive adhesive sheet 3 shown in FIG. 3 has a configuration in which both surfaces 21A and 21B of a base material-less pressure-sensitive adhesive layer 21 are protected by release liners 31 and 32 having at least a pressure-sensitive adhesive layer side, respectively.
- the pressure-sensitive adhesive sheet 4 shown in FIG. 4 has a structure in which one surface (adhesive surface) 21A of the base material-less pressure-sensitive adhesive layer 21 is protected by a release liner 31 whose both surfaces are release surfaces. When wound, the other surface (adhesive surface) 21B of the pressure-sensitive adhesive layer 21 is brought into contact with the back surface of the release liner 31 so that the other surface 21B is also protected by the release liner 31.
- the pressure-sensitive adhesive sheet 5 shown in FIG. 5 is provided with a pressure-sensitive adhesive layer 21 on one surface 10A (non-peelable) of the support 10, and at least the surface (pressure-sensitive adhesive surface) 21A of the pressure-sensitive adhesive layer 21 is peeled off at the pressure-sensitive adhesive layer side. It has the structure protected with the release liner 31 used as the surface.
- the pressure-sensitive adhesive sheet 6 shown in FIG. 6 has a configuration in which a pressure-sensitive adhesive layer 21 is provided on one surface 10A (non-peelable) of the support 10.
- the other surface 10B of the support 10 is a release surface. When the pressure-sensitive adhesive sheet 6 is wound, the pressure-sensitive adhesive layer 21 comes into contact with the other surface 10B, and the surface (pressure-sensitive adhesive surface) 21B of the pressure-sensitive adhesive layer is the support. It is protected by the other surface 10B.
- resin film in a single-sided adhesive type or double-sided adhesive type adhesive sheet with a substrate, as a support for supporting (lining) the adhesive layer, resin film, paper, cloth, rubber sheet, foam sheet, metal foil, and composites thereof Etc.
- resin films include polyolefin films such as polyethylene (PE), polypropylene (PP), and ethylene / propylene copolymers; polyester films such as polyethylene terephthalate (PET); vinyl chloride resin films; vinyl acetate resin films; Resin film; polyamide resin film; fluororesin film; cellophane and the like.
- PET polyethylene terephthalate
- vinyl chloride resin films vinyl acetate resin films
- Resin film polyamide resin film
- fluororesin film cellophane and the like.
- paper include Japanese paper, kraft paper, glassine paper, high quality paper, synthetic paper, top coat paper, and the like.
- the fabric examples include woven fabrics and non-woven fabrics made of various fibrous substances alone or by blending.
- the resin film here is typically a non-porous resin sheet, and is a concept that is distinguished from, for example, a nonwoven fabric (that is, does not include a nonwoven fabric).
- the resin film may be an unstretched film, a uniaxially stretched film, or a biaxially stretched film.
- the surface of the support on which the pressure-sensitive adhesive layer is provided may be subjected to a surface treatment such as application of a primer, corona discharge treatment, or plasma treatment.
- the thickness of the support is not particularly limited and can be appropriately selected depending on the purpose, but is generally 10 to 500 ⁇ m, preferably 10 to 200 ⁇ m. From the viewpoint of repulsion resistance, for example, a support having a thickness of 10 to 50 ⁇ m can be preferably used.
- the thickness of the pressure-sensitive adhesive layer is not particularly limited and can be appropriately selected according to the purpose. From the viewpoint of film formability and appearance, it is preferably 5 ⁇ m or more, more preferably 10 ⁇ m or more, preferably 200 ⁇ m or less, and more preferably 100 ⁇ m or less.
- the thickness of the pressure-sensitive adhesive layer means the thickness of each pressure-sensitive adhesive layer provided on both surfaces of the support in the case of a double-sided pressure-sensitive adhesive sheet with a substrate.
- the method for forming the pressure-sensitive adhesive layer is not particularly limited, and a known or conventional method can be used.
- a method of directly applying an aqueous dispersion type acrylic pressure-sensitive adhesive composition to a peelable or non-peelable substrate and drying by heating (direct method); an aqueous dispersion type acrylic pressure-sensitive adhesive on a surface having peelability
- direct method a method of directly applying an aqueous dispersion type acrylic pressure-sensitive adhesive composition to a peelable or non-peelable substrate and drying by heating
- direct method an aqueous dispersion type acrylic pressure-sensitive adhesive on a surface having peelability
- a method of forming a pressure-sensitive adhesive layer on the surface by applying and drying the composition and then transferring the pressure-sensitive adhesive layer to a non-peelable substrate can do.
- the aqueous dispersion type acrylic pressure-sensitive adhesive composition is applied using a conventional coater such as a gravure roll coater, reverse roll coater, kiss roll coater, dip roll coater, bar coater, knife coater, spray coater, etc. Can do.
- the heating and drying temperature is preferably 40 ° C to 200 ° C, more preferably 50 ° C to 180 ° C, and particularly preferably 70 ° C to 120 ° C.
- an appropriate time can be adopted as appropriate.
- the drying time is preferably 5 seconds to 20 minutes, more preferably 5 seconds to 10 minutes, and particularly preferably 10 seconds to 5 minutes.
- a conventional release paper or the like can be used and is not particularly limited.
- a release liner having a release treatment layer on the surface of a substrate such as a plastic film or paper, or a low adhesive material such as a fluorine-based polymer (polytetrafluoroethylene, etc.) or a polyolefin-based resin (polyethylene, polypropylene, etc.)
- a release liner or the like can be used.
- the release treatment layer may be formed, for example, by surface-treating the substrate with a release agent such as silicone, long chain alkyl, fluorine, or molybdenum sulfide.
- an organic solvent is usually used for the coating liquid containing a release agent used when providing the release treatment layer in order to improve the coatability.
- the organic solvent is not particularly limited, and examples thereof include aliphatic or alicyclic hydrocarbon solvents such as cyclohexane, hexane, and heptane; aromatic hydrocarbon solvents such as toluene and xylene; ethyl acetate, methyl acetate, and the like. Ester solvents; ketone solvents such as acetone and methyl ethyl ketone; alcohol solvents such as methanol, ethanol and butanol can be used. These organic solvents may be used alone or in combination of two or more.
- the thickness of the release treatment layer is preferably 0.001 to 10 ⁇ m, more preferably 0.03 to 5 ⁇ m, and particularly preferably 0.1 to 1 ⁇ m from the viewpoint of excellent releasability and suppression of thickness unevenness.
- Example 1 Preparation of monomer emulsion (A)
- 2EHA 2-ethylhexyl acrylate
- Aqualon HS-1025 anionic reactive surfactant Aqualon HS-1025 (Daiichi Kogyo Seiyaku Co., Ltd.) 1.5 parts by weight (solid content)
- a monomer emulsion (A) was prepared by adding 82 parts by weight of ion-exchanged water and stirring at 6000 rpm for 5 minutes in a nitrogen atmosphere using a homomixer (manufactured by Tokushu Kika Kogyo Co., Ltd.).
- MMA methyl methacrylate
- acrylic acid AA
- methacrylic acid MAA
- Aqualon HS-1025 which is an anionic reactive surfactant (first Kogyo Seiyaku Co., Ltd.) 1.5 parts by weight (solid content) and ion-exchanged water 82 parts by weight, and using a homomixer (Special Machine Industries Co., Ltd.) for 5 minutes under a nitrogen atmosphere, 6000 rpm And a monomer emulsion (B) was prepared.
- water-soluble azo polymerization initiator VA-057 (manufactured by Wako Pure Chemical Industries, Ltd., compound name: 2,2′-azobis [N- (2-carboxyl Ethyl) -2-methylpropionamidine] hydrate) is added in an amount of 0.05 parts by weight, and after 10 minutes, 150.6 parts by weight of the monomer emulsion (A) is added dropwise over 2.5 hours to form the core layer (A) A copolymer was obtained.
- the aqueous dispersion type acrylic pressure-sensitive adhesive composition is applied to a PET film (PET base material, trade name: Diafoil T-100, manufactured by Mitsubishi Plastics) so that the thickness after drying is 20 ⁇ m. After coating with a coater and drying at 100 ° C. for 3 minutes to form a pressure-sensitive adhesive layer, a release film (polyethylene terephthalate substrate, trade name: Diamond MRF-38, manufactured by Mitsubishi Chemical Polyester Co., Ltd.) is covered. An adhesive sheet was prepared.
- PET film PET base material, trade name: Diafoil T-100, manufactured by Mitsubishi Plastics
- a release film polyethylene terephthalate substrate, trade name: Diamond MRF-38, manufactured by Mitsubishi Chemical Polyester Co., Ltd.
- Table 1 below shows the blending ratio (solid content ratio) of the monomer and the anionic reactive surfactant (Aqualon HS-1025) in the monomer emulsion (A) used for polymer formation of the core layer (A), shell layer
- the blending ratio (solid content ratio) of the monomer and the reactive surfactant (AQUALON HS-1025) in the monomer emulsion (B) used for polymer formation of (B) is shown.
- the “initial charge” of the reactive surfactant (AQUALON HS-1025) in the table refers to the surfactant charged into the reaction vessel before polymerization.
- Examples 2 to 10, Comparative Examples 1 to 4 Core-shell structure acrylic copolymer particles in the same manner as in Example 1 except that the amounts of the monomer and the reactive surfactant in the monomer emulsion (A) and the monomer emulsion (B) were changed to the amounts shown in Table 1. , Preparation of an aqueous dispersion type acrylic pressure-sensitive adhesive composition, and manufacture of a pressure-sensitive adhesive sheet.
- dispersion of core-shell structure acrylic copolymer particles dispersed in an aqueous medium (dispersion medium) after emulsion polymerization was performed at the time of preparing the aqueous dispersion type acrylic pressure-sensitive adhesive composition.
- BA is an abbreviation for butyl acrylate
- 2EHA is an abbreviation for 2-ethylhexyl acrylate
- MMA is an abbreviation for methyl methacrylate
- AA is an abbreviation for acrylic acid
- MAA is an abbreviation for methacrylic acid.
- Table 2 below describes the physical properties of the core-shell structure copolymer particles (core layer (A)) in the aqueous dispersion type acrylic pressure-sensitive adhesive compositions obtained in Examples 1 to 10 and Comparative Examples 1 to 4.
- the glass transition temperature, number average particle size, adhesive force and friction force were determined by the following methods.
- the glass transition temperature of the copolymer constituting the core layer (A) and the shell layer (B) of the core-shell structure copolymer particles is as follows using the glass transition temperature Tg (K) of the homopolymer of each monomer shown below.
- the theoretical glass transition temperature (K) calculated by the FOX equation was converted to Celsius temperature (° C.).
- Tg glass transition temperature of the polymer (K)
- Tg 1, Tg 2, ⁇ , Tg n glass transition temperature of the homopolymer of each monomer (K)
- W 1, W 2, ⁇ ⁇ , W n weight fraction of each monomer
- ⁇ Adhesive strength> The adhesive tape obtained in each Example and Comparative Example was cut into a width of 20 mm and a length of 150 mm to produce a sample for measuring peel force.
- the release film was peeled off from the sample, and the pressure-sensitive adhesive layer of the sample was pressure-bonded to the various adherends with one reciprocation of a 2 kg roller under an atmosphere of 23 ° C. and cured at room temperature for 30 minutes, and then peeled off using a peeling tester.
- the peeling force at the time of peeling a sample was measured at a peeling angle of 180 ° and a peeling speed of 300 mm / min at °C.
- FIG. 7 is a conceptual diagram of this frictional force measurement test.
- the adhesive tapes obtained in the respective examples and comparative examples were cut into a width of 30 mm and a length of 50 mm to produce a sample 51 for measuring frictional force.
- 51a is a PET base material and 51b is an adhesive layer.
- the PP plate was cut into a width of 40 mm and a length of 80 mm to produce a frictional force measurement base 52.
- the release film was peeled off.
- a 20 mm ⁇ 20 mm adherend 54 with a guide 56 and a 30 g weight 55 are placed on the adhesive layer 51b of the measurement sample 51, and the adherend 54 and the weight 55 are integrally formed in a horizontal direction at 300 mm / mm.
- the sample was pulled in min and the stress applied at that time was measured.
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Abstract
Description
前記アクリル系重合体(B)のガラス転移温度が30℃以上であり、且つ、前記アクリル系重合体(A)のガラス転移温度が、前記アクリル系重合体(B)のガラス転移温度よりも低いことを特徴とする水分散液型アクリル系粘着剤組成物。
[2] 前記アクリル系重合体(A)のガラス転移温度が0℃未満であることを特徴とする上記[1]に記載の水分散液型アクリル系粘着剤組成物。
[3] 前記アクリル系重合体(B)のガラス転移温度が35℃以上である、上記[1]または[2]に記載の水分散液型アクリル系粘着剤組成物。
[4] 前記アクリル系重合体(A)のガラス転移温度が-55℃以下である、上記[1]~[3]のいずれか1つに記載の水分散液型アクリル系粘着剤組成物。
[5] 前記コアシェル構造アクリル系共重合体粒子におけるアクリル系重合体(A)とアクリル系重合体(B)の含有量比((A)/(B))が50/50~90/10(重量比)の範囲内である、上記[1]~[4]のいずれか1つに記載の水分散液型アクリル系粘着剤組成物。
[6] 前記コアシェル構造アクリル系共重合体粒子におけるアクリル系重合体(A)とアクリル系重合体(B)の含有比((A)/(B))が60/40~80/20(重量比)の範囲内である、上記[1]~[4]のいずれか1つに記載の水分散液型アクリル系粘着剤組成物。
[7] 前記コアシェル構造アクリル系重合体粒子の個数平均粒子径が100~400nmであり、且つ、粒子径分布が単峰性である、上記[1]~[6]のいずれか1つに記載の水分散液型アクリル系粘着剤組成物。
[8] 前記アクリル系重合体(B)がモノマーユニットとしてメタクリル酸メチルを含有する、上記[1]~[7]のいずれか一つに記載の水分散液型アクリル系粘着剤組成物。
[9] 前記アクリル系重合体(B)がモノマーユニットとしてカルボキシ基含有モノマーを含有する、上記[8]記載の水分散液型アクリル系粘着剤組成物。
[10] 前記アクリル系重合体(A)がモノマーユニットとしてアクリル酸C1-10アルキルエステルを含有する、上記[1]~[9]のいずれか一つに記載の水分散液型アクリル系粘着剤組成物。
[11] 当該水分散液型アクリル系粘着剤組成物が、反応性界面活性剤を使用した乳化重合によって得られたコアシェル構造アクリル系共重合体粒子が該乳化重合における水系媒体に分散した分散液である、上記[1]~[10]のいずれか一つに記載の水分散液型アクリル系粘着剤組成物。
[12] 上記[1]~[11]のいずれか1つに記載の水分散液型アクリル系粘着剤組成物により形成された粘着剤層を有する粘着シート。
なお、本明細書において記号「~」を用いて規定された数値範囲は「~」の両端(上限および下限)の数値を含むものとする。例えば「0.01~5」は0.01以上5以下を表す。また、本明細書中、「(メタ)アクリル」は「アクリル」と「メタクリル」の両方を意味し、「(メタ)アクリレート」は「アクリレート」と「メタクリレート」の両方を意味する。また、「水分散液」とは、分散媒が水系媒体の分散液を意味する。また、「Cx-y」は炭素数の範囲を表し、炭素数がx個以上、y個以下を意味する。また、「(メタ)アクリル酸Cx-yアルキルエステル」は「アルキル基の炭素原子数がx~yの(メタ)アクリル酸アルキルエステル」を意味する。
本発明の水分散液型アクリル系粘着剤組成物(以下、単に「粘着剤組成物」ということがある。)は、コア層(A)がアクリル系重合体(A)を含み、シェル層(B)がアクリル系重合体(B)を含む、コアシェル構造アクリル系共重合体粒子が水系媒体に分散した水分散液型アクリル系粘着剤組成物であり、アクリル系重合体(B)のガラス転移温度が30℃以上であり、且つ、アクリル系重合体(A)のガラス転移温度が、アクリル系重合体(B)のガラス転移温度よりも低いことが主たる特徴である。
(Tg:重合体のガラス転移温度(K)、Tg1、Tg2、・・・、Tgn:各モノマーのホモポリマーのガラス転移温度(K)、W1、W2、・・・、Wn:各モノマーの重量分率)
本発明は、上記の水分散液型アクリル系粘着剤組成物から形成された粘着剤層を有する粘着シートも提供する。粘着剤層を支持体の片面または両面に有する形態の基材付き粘着シートであってもよく、粘着剤層が剥離ライナーに保持された形態等の基材レスの粘着シートであってもよい。ここでいう粘着シートの概念には、粘着テープ、粘着ラベル、粘着フィルム等と称されるものが包含され得る。なお、上記粘着剤層は典型的には連続的に形成されるが、かかる形態に限定されるものではなく、例えば点状、ストライプ状等の規則的あるいはランダムなパターンに形成された粘着剤層であってもよい。また、本発明により提供される粘着シートは、ロール状であってもよく、枚葉状であってもよい。あるいは、さらに種々の形状に加工された形態の粘着シートであってもよい。
(モノマーエマルション(A)の調製)
容器に、原料として、2-エチルヘキシルアクリレート(2EHA)100重量部、アニオン系反応性界面活性剤であるアクアロンHS-1025(第一工業製薬(株)製)1.5重量部(固形分)、イオン交換水82重量部を入れ、ホモミキサー(特殊機化工業(株)製)を用いて、窒素雰囲気下で5分間、6000rpmで撹拌し、モノマーエマルション(A)を調製した。
容器に、原料として、メタクリル酸メチル(MMA)90重量部、アクリル酸(AA)5重量部、メタクリル酸(MAA)5重量部、アニオン系反応性界面活性剤であるアクアロンHS-1025(第一工業製薬(株)製)1.5重量部(固形分)、イオン交換水82重量部を入れ、ホモミキサー(特殊機化工業(株)製)を用いて、窒素雰囲気下で5分間、6000rpmで撹拌し、モノマーエマルション(B)を調製した。
冷却管、窒素導入管、温度計、滴下設備、及び撹拌羽根を備えた反応容器に、アニオン系反応性界面活性剤であるアクアロンHS-1025(第一工業製薬(株)製)0.5重量部(固形分)、イオン交換水76.8重量部を入れ、撹拌しながら十分に窒素置換した後、反応液を60℃まで昇温した。60℃で一定になったことを確認した後、水溶性アゾ重合開始剤であるVA-057(和光純薬工業(株)製、化合物名:2,2’-アゾビス[N-(2-カルボキシエチル)-2-メチルプロピオンアミジン]ハイドレート)0.05重量部を添加し、10分後にモノマーエマルション(A)150.6重量部を2時間半かけて滴下し、コア層(A)となる共重合体を得た。次いで、VA-057を0.05重量部更に添加し、10分後、モノマーエマルション(B)37.6重量部を45分かけて滴下し、シェル層(B)となる共重合体を形成して、コアシェル構造アクリル系共重合体粒子を製造した。得られたコアシェル構造共重合体粒子の個数平均粒子径は160nmであった。
上記で得られた、コアシェル構造アクリル系共重合体粒子が乳化重合後の水系媒体に分散した分散液100重量部に対し、濃度10%のアンモニア水を0.18重量部添加してpH7.5にし、固形分濃度38%のコアシェル構造共重合体粒子を含有する水分散液型粘着剤組成物を得た。
上記水分散液型アクリル系粘着剤組成物を、乾燥後の厚みが20μmとなるように、PETフィルム(PET基材、商品名:ダイアホイルT-100、三菱樹脂(株)製)上にダイコーターにより塗布した後、100℃で3分間乾燥して粘着剤層を形成した後、離型フィルム(ポリエチレンテレフタレート基材、商品名:ダイアホルムMRF-38、三菱化学ポリエステル(株)製)を被せ、粘着シートを作製した。
モノマーエマルション(A)及びモノマーエマルション(B)におけるモノマーと反応性界面活性剤の配合量を表1に示す量に変更した以外は、実施例1と同様にして、コアシェル構造アクリル系共重合体粒子の製造、水分散液型アクリル系粘着剤組成物の調製、及び粘着シートの製造を行った。なお、実施例5~7及び比較例2では、水分散液型アクリル系粘着剤組成物の調製時、コアシェル構造アクリル系共重合体粒子が乳化重合後の水系媒体(分散媒)に分散した分散液中のコアシェル構造アクリル系共重合体粒子(固形分)100重量部当たり重合ロジンエステル系粘着付与剤(荒川化学工業(株)製の「スーパーエステルE-865-NT」)を10重量部(固形分)添加した。
コアシェル構造共重合体粒子のコア層(A)、シェル層(B)を構成する共重合体のガラス転移温度は、下記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の式により算出される理論ガラス転移温度(K)を、摂氏温度(℃)に換算した。
2EHA:2-エチルヘキシルアクリレート=203K
MMA:メタクリル酸メチル=378K
AA:アクリル酸=379K
MAA:メタクリル酸=403K
[式中、Tg:重合体のガラス転移温度(K)、Tg1、Tg2、・・・、Tgn:各モノマーのホモポリマーのガラス転移温度(K)、W1、W2、・・・、Wn:各モノマーの重量分率]
コアシェル構造共重合体粒子の個数平均粒子径は、水分散液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。また、測定された粒子径分布から山頂の数が1つ(単)か複数(多)かを判断した。
装置:レーザ回折・散乱法粒子径分布測定装置(ベックマンコールター(株)製LS13 320 PIDSモード)
分散質の屈折率:1.48(ポリ(アクリル酸n-ブチル)を使用)
分散媒の屈折率:1.33
各実施例及び比較例で得られた粘着テープを幅20mm、長さ150mmに切断し、剥離力測定用サンプルを作製した。該サンプルから、剥離フィルムを剥がし、23℃の雰囲気下で該サンプルの粘着剤層を各種被着体に2kgローラー1往復で圧着し、室温で30分間養生した後、剥離試験機を用いて23℃下、剥離角度180°、剥離速度300mm/minにてサンプルを剥離する際の剥離力を測定した。
図7はこの摩擦力の測定試験の概念図である。各実施例及び比較例で得られた粘着テープを幅30mm、長さ50mmに切断し、摩擦力測定用サンプル51を作製した。51aはPET基材、51bは粘着剤層である。PP板を幅40mm、長さ80mmに切断し、摩擦力測定用土台52を作製した。この測定用土台52に対し、両面粘着テープ(日東電工(株)製、No.5000NSリョウメンテープ)53を介して測定用サンプル51のPET面(PET基材51aの表面)を貼り付けた後、剥離フィルムを剥がした。次いで、測定用サンプル51の粘着剤層51b上に、導き56を付けた20mm×20mmの被着体54および30gの錘55を載せ、被着体54と錘55を一体で水平方向に300mm/minで引張り、その時にかかる応力を測定した。
10 基材
21、22 粘着剤層
31、32 剥離ライナー
51 摩擦力測定用サンプル
51a PET基材
51b 粘着剤層
52 摩擦力測定用土台
53 両面粘着テープ
54 被着体
55 錘
56 導き
Claims (6)
- コア層(A)がアクリル系重合体(A)を含み、シェル層(B)がアクリル系重合体(B)を含む、コアシェル構造アクリル系共重合体粒子が水系媒体に分散してなる水分散液型アクリル系粘着剤組成物であって、
前記アクリル系重合体(B)のガラス転移温度が30℃以上であり、且つ、前記アクリル系重合体(A)のガラス転移温度が、前記アクリル系重合体(B)のガラス転移温度よりも低いことを特徴とする水分散液型アクリル系粘着剤組成物。 - 前記アクリル系重合体(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に記載の水分散液型アクリル系粘着剤組成物。
- 前記コアシェル構造アクリル系共重合体粒子におけるアクリル系重合体(A)とアクリル系重合体(B)の含有量比((A)/(B))が50/50~90/10(重量比)の範囲内である、請求項1または2記載の水分散液型アクリル系粘着剤組成物。
- 前記コアシェル構造アクリル系重合体粒子の個数平均粒子径が100~400nmであり、且つ、粒子径分布が単峰性である、請求項1~3のいずれか1項に記載の水分散液型アクリル系粘着剤組成物。
- 前記アクリル系重合体(B)がモノマーユニットとしてメタクリル酸メチルを含有する、請求項1~4のいずれか1項に記載の水分散液型アクリル系粘着剤組成物。
- 請求項1~5のいずれか1項に記載の水分散液型アクリル系粘着剤組成物により形成された粘着剤層を有する粘着シート。
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EP17846628.0A EP3508542A4 (en) | 2016-09-01 | 2017-08-31 | WATER DISPERSED ACRYLIC ADHESIVE COMPOSITION |
US16/329,952 US20190194507A1 (en) | 2016-09-01 | 2017-08-31 | Water-dispersed acrylic adhesive composition |
CN201780053616.7A CN109642135A (zh) | 2016-09-01 | 2017-08-31 | 水分散液型丙烯酸类粘合剂组合物 |
KR1020197008916A KR20190045257A (ko) | 2016-09-01 | 2017-08-31 | 수 분산액형 아크릴계 점착제 조성물 |
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KR102176891B1 (ko) * | 2019-05-29 | 2020-11-11 | 주식회사 대양포리졸 | 접착제 조성물 및 이의 제조방법 |
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2017
- 2017-08-31 KR KR1020197008916A patent/KR20190045257A/ko not_active Application Discontinuation
- 2017-08-31 CN CN201780053616.7A patent/CN109642135A/zh active Pending
- 2017-08-31 WO PCT/JP2017/031289 patent/WO2018043624A1/ja unknown
- 2017-08-31 JP JP2018537380A patent/JP7068174B2/ja active Active
- 2017-08-31 EP EP17846628.0A patent/EP3508542A4/en not_active Withdrawn
- 2017-08-31 US US16/329,952 patent/US20190194507A1/en not_active Abandoned
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KR20190045257A (ko) | 2019-05-02 |
JPWO2018043624A1 (ja) | 2019-06-24 |
EP3508542A1 (en) | 2019-07-10 |
CN109642135A (zh) | 2019-04-16 |
US20190194507A1 (en) | 2019-06-27 |
JP7068174B2 (ja) | 2022-05-16 |
EP3508542A4 (en) | 2020-04-08 |
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