WO2022250106A1 - 粘着剤用主剤、粘着剤組成物及び粘着フィルム - Google Patents
粘着剤用主剤、粘着剤組成物及び粘着フィルム Download PDFInfo
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- WO2022250106A1 WO2022250106A1 PCT/JP2022/021510 JP2022021510W WO2022250106A1 WO 2022250106 A1 WO2022250106 A1 WO 2022250106A1 JP 2022021510 W JP2022021510 W JP 2022021510W WO 2022250106 A1 WO2022250106 A1 WO 2022250106A1
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- Prior art keywords
- adhesive
- copolymer
- acrylate
- meth
- film
- Prior art date
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Classifications
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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
- C08F220/14—Methyl esters, e.g. methyl (meth)acrylate
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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
- C08F220/20—Esters of polyhydric alcohols or phenols, e.g. 2-hydroxyethyl (meth)acrylate or glycerol mono-(meth)acrylate
-
- 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
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/56—Acrylamide; Methacrylamide
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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
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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
- C09J133/24—Homopolymers or copolymers of amides or imides
- C09J133/26—Homopolymers or copolymers of acrylamide or methacrylamide
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
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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
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
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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
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
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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
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
- C09J2301/416—Additional features of adhesives in the form of films or foils characterized by the presence of essential components use of irradiation
Definitions
- the present disclosure relates to an adhesive base agent, an adhesive composition, and an adhesive film.
- Patent Document 1 a (co)polymer having a specific alkyl (meth)acrylate as an essential structural unit has been developed (for example, Patent Document 1).
- the present disclosure provides an adhesive main agent for producing an adhesive film having excellent adhesiveness in a wide temperature range, an adhesive composition containing this adhesive main agent, and an adhesive film produced from this adhesive composition. intended to provide
- the adhesive main agent (B) includes an alkyl acrylate (a1) having an alkyl group having 4 to 8 carbon atoms, a (meth)acrylate (a2) having a hydroxyl group, and each carbon It contains a copolymer (A) containing a dialkyl (meth)acrylamide (a3) having two alkyl groups of 1 to 2 as structural units.
- a pressure-sensitive adhesive composition according to one aspect of the present disclosure contains the main agent for pressure-sensitive adhesive (B) and a polyfunctional (meth)acrylate (C).
- a pressure-sensitive adhesive film according to one aspect of the present disclosure has a cured layer made of a cured product of the pressure-sensitive adhesive composition.
- acrylic adhesives are known as adhesives for adhesive tapes or adhesive sheets.
- acrylic pressure-sensitive adhesive a (co)polymer having a specific alkyl (meth)acrylate as an essential structural unit has been developed (for example, JP-A-2004-143420).
- Patent Document 1 Even the technique of Patent Document 1 was not sufficiently satisfactory in terms of adhesiveness in a wide temperature range.
- the inventor conducted studies to provide an adhesive base agent for producing an adhesive film with excellent adhesiveness in a wide temperature range, and as a result, arrived at the present disclosure.
- the adhesive main agent (B) comprises a residue of an alkyl acrylate (a1) having an alkyl group having 4 to 8 carbon atoms and a residue of a (meth)acrylate (a2) having a hydroxyl group. and a residue of dialkyl(meth)acrylamide (a3) having two alkyl groups each having 1 to 2 carbon atoms as structural units.
- the pressure-sensitive adhesive film having a cured layer comprising a cured product of the pressure-sensitive adhesive composition (X) containing the main ingredient (B) for pressure-sensitive adhesives of the present embodiment exhibits the following effects.
- a high-temperature atmosphere for example, in an atmosphere of 40° C., the adhesive strength can be increased when the adhesive film is attached to an object, and when the adhesive film is peeled off from the object, adhesive residue is less likely to occur.
- glue residue refers to a phenomenon in which the cured layer is damaged and part of it remains on the object.
- the alkyl acrylate (a1) (hereinafter also referred to as component (a1)) in the present embodiment has an alkyl group having 4 to 8 carbon atoms, as described above.
- Component (a1) contains, for example, at least one selected from the group consisting of n-butyl acrylate, neopentyl acrylate, n-octyl acrylate, and 2-ethylhexyl acrylate.
- component (a1) preferably contains at least one of 2-ethylhexyl acrylate and n-butyl acrylate, more preferably 2-ethylhexyl acrylate, 2-ethylhexyl acrylate and n-butyl acrylate. and at least one of the combination, particularly preferably 2-ethylhexyl acrylate.
- the (meth)acrylate (a2) having a hydroxyl group (hereinafter also referred to as the (a2) component) in the present disclosure is a (meth)acrylic acid ester having a hydroxyl group and excluding the above component (a1).
- the (a2) component is, for example, a (meth)acrylate (a21) having a primary hydroxyl group (hereinafter also referred to as the (a21) component), a (meth)acrylate (a22) having a secondary hydroxyl group (hereinafter also referred to as the (a22) component and (meth)acrylate (a23) having a primary hydroxyl group and a secondary hydroxyl group (hereinafter also referred to as component (a23)).
- (Meth)acrylate means at least one of methacrylate and acrylate
- (meth)acrylic means at least one of methacrylic and acrylic.
- Component (a21) is, for example, 2-hydroxyethyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 2-hydroxy-1-methylethyl (meth)acrylate, 6- It contains at least one selected from the group consisting of hydroxyhexyl (meth)acrylate, 8-hydroxyoctyl (meth)acrylate, 10-hydroxydecyl (meth)acrylate and 12-hydroxylauryl (meth)acrylate.
- the (a22) component contains, for example, at least one selected from the group consisting of 2-hydroxypropyl (meth)acrylate and 2-hydroxybutyl (meth)acrylate.
- the (a23) component contains, for example, glycerin mono(meth)acrylate.
- the (a2) component preferably contains a (meth)acrylate having at least a secondary hydroxyl group. That is, the (a2) component preferably contains, for example, at least one of the (a22) component and the (a23) component. More preferably, the (a2) component contains the (a22) component, the (a23) component, or the (a21) component and the (a22) component. It is particularly preferred that the (a2) component contains the (a23) component, or the (a21) component and the (a22) component.
- Dialkyl (meth)acrylamide (a3) contains, for example, at least one selected from the group consisting of dimethyl(meth)acrylamide and diethyl(meth)acrylamide.
- component (a3) preferably contains at least one of dimethyl acrylate and diethyl acrylamide, and more preferably contains both dimethyl acrylate and diethyl acrylate.
- the copolymer (A) in the present disclosure contains component (a1), component (a2) and component (a3) as constituent monomers.
- a constituent monomer is a monomer that constitutes the copolymer (A) by polymerizing. That is, the copolymer (A) is a polymer of constituent monomers containing components (a1), (a2) and (a3).
- the copolymer (A) contains, as constituent units, the residue of the component (a1), the residue of the component (a2), and the residue of the component (a3).
- the constituent monomers of the copolymer (A) may contain only components (a1), (a2) and (a3), or may further contain monomers other than these.
- Constituent monomers include, as monomers other than components (a1), (a2), and (a3), for example, a monomer (a4) having a carboxy group (hereinafter also referred to as component (a4)) and a monomer (a5) other than components (a1), (a2), (a3) and (a4) (hereinafter also referred to as component (a5)).
- the copolymer (A) may contain only the residue of the component (a1), the residue of the component (a2), and the residue of the component (a3) as constituent units, and the residue of the component (a1), In addition to the residue of the component (a2) and the residue of the component (a3), at least one of the residue of the component (a4) and the residue of the component (a5) may be further included as a structural unit. .
- Component (a4) includes, for example, monobasic acids such as (meth)acrylic acid and crotonic acid, polybasic acids such as maleic acid, itaconic acid and fumaric acid or their acid anhydrides, and monoalkyls of these polybasic acids. It contains at least one selected from the group consisting of esters. Component (a4) preferably contains at least one selected from the group consisting of acrylic acid, methacrylic acid, maleic anhydride and itaconic acid, more preferably acrylic acid.
- Component (a5) includes, for example, vinyl esters such as vinyl acetate, vinyl propionate and vinyl butyrate, methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, neopentyl methacrylate, n-octylmethacrylate, It contains at least one selected from the group consisting of (meth)acrylates such as acrylate, nonyl (meth)acrylate, 2-ethylhexyl methacrylate, decyl (meth)acrylate, and lauryl (meth)acrylate.
- the (a5) component preferably contains vinyl acetate from the viewpoint of adhesiveness.
- the copolymer (A) in the present embodiment is prepared by polymerizing constituent monomers including components (a1), (a2) and (a3) by a known polymerization method such as bulk polymerization, solution polymerization, emulsion polymerization, or It can be synthesized by polymerization such as suspension polymerization.
- known polymerization initiators for example azo polymerization initiators such as azobisisobutyronitrile and azobisisovaleronitrile, or peroxides such as benzoyl peroxide, di-t-butyl peroxide, lauryl peroxide
- the constituent monomers can be polymerized in the presence of such as a system polymerization initiator.
- solvent (S) contains at least one selected from the group consisting of, for example, acetone and ethyl acetate.
- a mixture of the solvent (S) and the copolymer (A) is obtained by this solution polymerization.
- the solvent (S) and the copolymer (A) in this mixture can be separated to obtain only the copolymer (A).
- the mixture of the solvent (S) and the copolymer (A) can be used as it is as the main agent (B) for pressure-sensitive adhesives, which will be described later.
- the main agent (B) for pressure-sensitive adhesives can be prepared by adjusting the content of the solvent (S) in the mixture, if necessary, and adding appropriate additives to the mixture, if necessary.
- the glass transition temperature (Tg) of the copolymer (A) is preferably -50°C or higher and -30°C or lower, more preferably -40°C or higher and -30°C or lower, from the viewpoint of the balance between bending resistance and adhesiveness. be.
- the glass transition temperature (Tg) is the loss factor (tan ⁇ ) was taken as the temperature showing the peak value.
- Jig ⁇ 8mm parallel plate.
- Sample thickness 1 mm.
- Distortion 1%.
- Frequency 1 Hz.
- Heating rate 5°C/min.
- Temperature range -50°C to 180°C.
- the above Tg can be appropriately adjusted by selecting the type of each monomer in the constituent monomers of the copolymer (A) and adjusting the weight ratio. For example, the higher the weight ratio of component (a1) in the total constituent monomers, the lower the Tg, and the higher the weight ratio of components (a2) and (a3), the higher the Tg.
- the weight-average molecular weight (Mw, polystyrene equivalent) of the copolymer (A) obtained by gel permeation chromatography (GPC) is preferably 300,000 or more from the viewpoint of improving adhesiveness and improving handleability. 1,200,000 or less, more preferably 400,000 or more and 1,000,000 or less, particularly preferably 500,000 or more and 900,000 or less.
- Measurement conditions for gel permeation chromatography (GPC) in this embodiment are as follows.
- - Apparatus "HLC-8120GPC” [manufactured by Tosoh Corporation].
- -Column "Guardcolumn HXL-H” (one column) and “TSKgelGMHXL” (two columns) [both manufactured by Tosoh Corporation].
- Sample solution 0.25% by weight tetrahydrofuran solution.
- Solution injection volume 100 ⁇ l.
- Flow rate 1 ml/min.
- Measurement temperature 40°C.
- Detection device refractive index detector.
- Reference material standard polystyrene.
- the hydroxyl group concentration of the copolymer (A) is preferably 0.01 mol/kg or more and 1.0 mol/kg or less, more preferably 0, from the viewpoint of the balance between suppression of deterioration of adhesive strength over time and adhesiveness. 0.1 mol/kg or more and 0.9 mol/kg or less, particularly preferably 0.2 mol/kg or more and 0.8 mol/kg or less.
- the hydroxyl group concentration of the copolymer (A) is the number of moles of hydroxyl groups possessed by the copolymer (A) per unit weight of the copolymer (A).
- the hydroxyl group concentration can be calculated from the result of measuring the hydroxyl value (KOHmg/g) of the copolymer (A) according to JIS K0070.
- the molar ratio [primary hydroxyl group/secondary hydroxyl group] ( ⁇ ) of the primary hydroxyl group to the secondary hydroxyl group of the copolymer (A) is preferable from the viewpoint of the balance between the suppression of adhesive residue and the improvement of adhesiveness. is 0/100 or more and 90/10 or less, more preferably 10/90 or more and 70/30 or less, and particularly preferably 15/85 or more and 50/50 or less.
- This molar ratio ( ⁇ ) can be determined, for example, from the spectrum obtained by measuring the copolymer (A) by 1 H-NMR (nuclear magnetic resonance spectroscopy).
- the hydroxyl group concentration and molar ratio ( ⁇ ) of the copolymer (A) can be adjusted, for example, by selecting the type of component (a2) in the constituent monomers of the copolymer (A) and adjusting the weight ratio.
- the amide group concentration of the copolymer (A) is preferably 0.01 mol/kg or more and 0.5 mol/kg or less, more preferably 0.1 mol/kg, from the viewpoint of the balance between bending resistance and adhesiveness. kg or more and 0.45 mol/kg or less, particularly preferably 0.2 mol/kg or more and 0.4 mol/kg or less.
- the amide group concentration of the copolymer (A) is the number of moles of amide groups possessed by the copolymer (A) per unit weight of the copolymer (A).
- the amide groups possessed by the copolymer (A) are derived from the component (a3).
- the amide group concentration is calculated from the type and weight of the component (a3) based on the total weight of the constituent monomers of the copolymer (A) by measuring the protons of the alkyl groups bonded to the amide group by 1 H-MNR. can.
- the amide group concentration of the copolymer (A) can be adjusted, for example, by selecting the type of component (a3) in the constituent monomers of the copolymer (A) and adjusting the weight ratio.
- the carboxyl group concentration of the copolymer (A) is preferably 0 mol/kg or more and 0.35 mol/kg or less, more preferably 0 mol/kg or more and 0.17 mol or more, from the viewpoint of adhesiveness and deterioration suppression. /kg or less, particularly preferably 0.01 mol/kg or more and 0.09 mol/kg or less.
- the carboxy group concentration of the copolymer (A) is the number of moles of carboxy groups possessed by the copolymer (A) per unit weight of the copolymer (A).
- the carboxy group concentration can be calculated from the result of measuring the acid value (KOHmg/g) of the copolymer (A) according to JIS K0070, for example.
- the carboxy group concentration of the copolymer (A) can be adjusted, for example, by selecting the type of component (a4) in the constituent monomers of the copolymer (A) and adjusting the weight ratio.
- the ratio of the total weight of component (a1), component (a2) and component (a3) to the total weight of the constituent monomers of copolymer (A) is preferably 70% by weight or more and 100% by weight or less, and further It is preferably 80% by weight or more and 98% by weight or less, and particularly preferably 85% by weight or more and 95% by weight or less.
- the proportion of component (a1) is preferably 75% by weight or more with respect to the total weight of component (a1), component (a2) and component (a3) in the constituent monomers of copolymer (A). 97% by weight or less, more preferably 80% by weight or more and 95% by weight or less, and the proportion of component (a2) is preferably 0.5% by weight or more and 15% by weight or less, more preferably 1% by weight or more and 12% by weight or less. and the proportion of component (a3) is preferably 1% by weight or more and 10% by weight or less, more preferably 2% by weight or more and 8% by weight or less.
- the main agent (B) for adhesives of this embodiment contains the copolymer (A).
- the main agent for pressure-sensitive adhesive (B) is suitable as a main agent for the pressure-sensitive adhesive composition (X) described below.
- the base agent for adhesive (B) consists of, for example, copolymer (A) only.
- the main agent for pressure-sensitive adhesives (B) may contain the copolymer (A) and the solvent (S).
- Solvent (S) contains, for example, at least one selected from the group consisting of acetone and ethyl acetate, but is not limited thereto.
- the proportion of the solvent (S) is preferably 50% by weight or more and 80% by weight or less, more preferably 60% by weight or more and 70% by weight or less, relative to the weight of the main agent for adhesive (B).
- the adhesive main agent (B) may contain appropriate additives other than the copolymer (A) and the adhesive agent main agent (B), if necessary. Moreover, it is preferable that the main agent for pressure-sensitive adhesive (B) does not contain a component having reaction curability.
- the polyfunctional (meth)acrylate (C) (hereinafter also referred to as component (C)) in the present embodiment is a compound having multiple (meth)acryloyl groups in the molecule.
- a (meth)acryloyl group is one or both of an acryloyl group and a methacryloyl group.
- Component (C) includes, for example, a bifunctional (meth)acrylate having one hydroxyl group (C1), a tri- to penta-functional (meth)acrylate having one hydroxyl group (C2), and a tri- to hexa-functional (C2) having no hydroxyl group ( It contains at least one selected from the group consisting of meth)acrylates (C3).
- a bifunctional (meth)acrylate (C1) having one hydroxyl group (hereinafter also referred to as the (C1) component) has one hydroxyl group and two (meth)acryloyl groups in the molecule.
- the (C1) component contains, for example, at least one selected from the group consisting of glycerin di(meth)acrylate, trimethylolpropane di(meth)acrylate and trimethylolethane di(meth)acrylate.
- a tri- to penta-functional (meth)acrylate (C2) having one hydroxyl group (hereinafter also referred to as the (C2) component) has one hydroxyl group and three to five (meth)acryloyl groups in the molecule.
- Component (C2) is, for example, selected from the group consisting of pentaerythritol tri(meth)acrylate, dipentaerythritol penta(meth)acrylate, sorbitol penta(meth)acrylate, and ditrimethylolpropane tri(meth)acrylate. Contains at least one.
- Tri- to hexa-functional (meth)acrylate (C3) having no hydroxyl group (hereinafter also referred to as (C3) component) has no hydroxyl group in the molecule and has 3 to 6 (meth)acryloyl groups .
- Component (C3) is, for example, glycerin tri(meth)acrylate, trimethylolpropane tri(meth)acrylate, trimethylolethane tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol hexa(meth) It contains at least one selected from the group consisting of acrylates, sorbitol hexa(meth)acrylate, and ditrimethylolpropane tetra(meth)acrylate.
- Component (C) preferably contains component (C3), component (C1) and component (C3), or component (C2) and component (C3), from the viewpoint of adhesiveness and adhesive residue. It is preferred to contain a component.
- Component (C) more preferably contains component (C3), and particularly preferably contains trimethylolpropane tri(meth)acrylate.
- the pressure-sensitive adhesive composition (X) of the present embodiment contains a main component (B) for pressure-sensitive adhesive containing the copolymer (A), and the component (C).
- the ratio of the copolymer (A) is 75% by weight or more and 99.9% by weight or less with respect to the total weight of the copolymer (A) and the (C) component in the pressure-sensitive adhesive composition (X), and the proportion of component (C) is 0.1% by weight or more and 25% by weight or less, more preferably the proportion of copolymer (A) is 85% by weight or more and 99.7% by weight or less, and the proportion of component (C) is The ratio is 0.3% by weight or more and 15% by weight or less, and particularly preferably the ratio of copolymer (A) is 95% by weight or more and 99.5% by weight or less, and the ratio of component (C) is 0.5% by weight. % or more and 5% by weight or less.
- the adhesive composition (X) of the present embodiment can be produced, for example, by mixing the adhesive main agent (B) containing the copolymer (A) and the component (C).
- the pressure-sensitive adhesive composition (X) of the present embodiment may further contain additives as necessary within a range that does not impair the effects of the present disclosure.
- Additives are selected from the group consisting of tackifiers (N) such as terpene resins and rosin resins, photopolymerization initiators (D), plasticizers, fillers, pigments, UV absorbers, antioxidants, and the like. can contain at least one tackifiers (N) such as terpene resins and rosin resins, photopolymerization initiators (D), plasticizers, fillers, pigments, UV absorbers, antioxidants, and the like. can contain at least one
- the pressure-sensitive adhesive film of this embodiment has a cured layer made of a cured product of the pressure-sensitive adhesive composition (X).
- the thickness of the cured layer is preferably 10 ⁇ m or more and 200 ⁇ m or less, more preferably 20 ⁇ m or more and 100 ⁇ m or less.
- the adhesive film consists of, for example, only a cured layer.
- the adhesive film may also include a film-like base material and a cured layer overlaid on this base material.
- the cured product is obtained by curing the component (C) in the adhesive composition (X) by reacting it.
- the adhesive composition (X) contains the solvent (S)
- the cured product of the adhesive composition (X) may not contain the solvent (S).
- a cured product can be obtained by volatilizing the solvent (S) in the pressure-sensitive adhesive composition (X) and then reacting and curing the component (C).
- the pressure-sensitive adhesive film of the present embodiment is obtained by directly applying the pressure-sensitive adhesive composition (X) to at least part of at least one side of the substrate using various coating devices, and then applying the pressure-sensitive adhesive composition (X).
- a preferred form is to apply the adhesive composition (X) and then cure the adhesive composition (X) with active energy rays. That is, the pressure-sensitive adhesive composition (X) can also be said to be an active energy ray-curable pressure-sensitive adhesive composition.
- the base material is, for example, film-like or sheet-like.
- Substrates are, for example, plastic films, plastic sheets, plastic foams, flat yarns, paper, metal plates, metal foils, woven fabrics, non-woven fabrics, or wood.
- the plastic includes at least one selected from the group consisting of polyolefins such as polyethylene and polypropylene, polyurethane, polyethylene terephthalate, polyvinyl chloride, rayon and polyamide.
- the paper is, for example, Japanese paper or crepe paper.
- the pressure-sensitive adhesive film having a cured layer made of the cured product of the pressure-sensitive adhesive composition (X) containing the pressure-sensitive adhesive main agent (B) of the present embodiment has excellent adhesiveness in a wide temperature range, and is therefore suitable for packaging (frozen food packaging, binding of vegetables, etc.), marking (automobile moldings, emblems, marks, etc.), masking (glass sealing, architectural curing, etc.), surface protection (painted surface protection, etc.), medical use (adhesive bandages, etc.) ) and various uses such as office use.
- the adhesive film of the present embodiment can suppress deterioration of metal (oxide) films, particularly ITO (indium tin oxide) films, it can be suitably used for protecting electronic substrates. Furthermore, since the pressure-sensitive adhesive film of the present embodiment is excellent in bending resistance, it is also useful for protecting flexible displays, for example.
- Example 1 A reaction vessel equipped with a stirrer, a thermometer, a reflux condenser, a dropping funnel and a nitrogen gas introduction tube was charged with 100 parts by weight of acetone as a solvent and heated to 57°C.
- composition of monomer mixture 2-ethylhexyl acrylate (a1-1) 88 parts by weight, 2-hydroxypropyl acrylate (a22-3) 6.8 parts by weight, 2-hydroxy-1-methylethyl acrylate (a21-2) 2 .3 parts by weight, 1.5 parts by weight of dimethylacrylamide (a3-1), and 1.5 parts by weight of diethylacrylamide (a3-2).
- composition of initiator solution 1 0.07 parts by weight of 2,2'-azobis(2,4-dimethylvaleronitrile) [hereinafter sometimes abbreviated as V-65] and 20 parts by weight of acetone.
- the initiator solution 2 having the following composition was continuously added to the reaction vessel over 1 hour using a dropping funnel while stirring the liquid in the reaction vessel while maintaining the inside of the reaction vessel at 57°C. dripped into. Furthermore, the polymerization reaction was allowed to continue for 1 hour in the reaction vessel under reflux of the solvent. As a result, a main adhesive agent (B-1) containing the copolymer (A-1) was prepared in the reaction vessel. This adhesive main agent (B-1) was taken out from the reaction vessel.
- composition of initiator solution 2 0.10 parts by weight of 2,2'-azobis(2,4-dimethylvaleronitrile) and 10 parts by weight of acetone.
- the copolymer (A-1) has a weight average molecular weight (Mw) of 900,000, a glass transition temperature of ⁇ 35° C., a hydroxyl group concentration of 0.7 mol/kg, an amide group concentration of 0.3 mol/kg, The molar ratio ( ⁇ ) was 25/75 and the carboxy group concentration was 0 mol/kg.
- Each of the pressure-sensitive adhesive compositions (X-1) to (X-11) is applied at an environmental temperature of 23 ° C. to a 25 ⁇ m thick polyester film [manufactured by Toray Industries, Inc., product name: Lumirror Type T, polyethylene terephthalate (PET) film].
- a coating film was prepared by coating the surface with a coating amount of 30 g/m 2 using a slot coater and drying at 100° C. for 1 minute with a circulating air dryer.
- This coating film was irradiated with UV rays using a UV irradiation device [manufactured by Ushio Inc., model number UVC-02516S1AA01], using a metal halide lamp as the light source, and under the conditions of an integrated light intensity of 1000 mJ/cm 2 , thereby irradiating the coating film. It was cured to produce a cured layer with a thickness of 30 ⁇ m. As a result, an adhesive film (Y ⁇ ) comprising a polyester film and a cured layer overlaid thereon was obtained.
- each of the pressure-sensitive adhesive compositions (X-1) to (X-11) was subjected to a release treatment of a polyester film (polyethylene terephthalate film) having a thickness of 50 ⁇ m and having one side subjected to a release treatment (silicone treatment).
- a coating film was prepared by coating the surface of the substrate so that the film thickness after drying was 30 ⁇ m and drying with hot air at 100° C. for 2 minutes.
- a release-treated side of a polyester film having a thickness of 50 ⁇ m and one side of which was subjected to release treatment (silicone treatment) was superimposed.
- the coating film was cured by irradiating the coating film with ultraviolet rays under the condition of an integrated light amount of 1000 mJ/cm 2 in the same manner as in the case of producing the adhesive film (Y ⁇ ), thereby producing a cured layer with a thickness of 50 ⁇ m.
- a pressure-sensitive adhesive film (Y ⁇ ) was obtained in which a release film made of a polyester film was laminated on both sides.
- Adhesive strength at low temperature An adhesive film test piece having a planar view size of 100 mm x 25 mm was cut out from the adhesive film (Y ⁇ ). A polyethylene terephthalate film having a thickness of 0.18 mm and having an ITO (indium tin oxide) film laminated on one side was also prepared. Under an atmosphere of 5° C., an adhesive film test piece and a polyethylene terephthalate film were superimposed so that the cured layer and the ITO film were in contact with each other, based on the "adhesive tape, adhesive sheet test method" specified in JIS Z0237-2000. .
- This laminated film was allowed to stand for 1 day under conditions of a temperature of 5°C and a relative humidity of 90%. , and a tensile speed of 300 mm/min. The results were evaluated according to the following evaluation criteria.
- AA Greater than 9N/25mm.
- A More than 7N/25mm and 9N/25mm or less.
- B greater than 5N/25mm and less than or equal to 7N/25mm.
- C 5 N/25 mm or less.
- This laminated film is left for 14 days under conditions of a temperature of 5 ° C. and a relative humidity of 90%, and then an adhesive film test for polyethylene terephthalate film in an atmosphere of 25 ° C. in the same manner as in ⁇ 1> above. The 180° peel strength of the strips was measured.
- AA greater than 1N/25mm and less than or equal to 2N/25mm.
- ITO layer deterioration test 1 After peeling off the adhesive film test piece from the polyethylene terephthalate film by the test ⁇ 2>, the electrical resistance value (R5) of the ITO film in the polyethylene terephthalate film was measured. Before the test ⁇ 2>, the electrical resistance value (R0) of the ITO film in the polyethylene terephthalate film was measured in advance. Based on these, the change rate of the electrical resistance value of the ITO film was calculated by the following formula, and the results were evaluated according to the following evaluation criteria.
- Rate of change (%) [(R5) - (R0)] x 100/(R0) ⁇ Evaluation Criteria> AA: Less than 5% change.
- Adhesive strength at high temperature From the adhesive film (Y ⁇ ) obtained above, an adhesive film test piece having a planar view size of 100 mm ⁇ 25 mm was cut out. A polyethylene terephthalate film having a thickness of 0.18 mm and having an ITO (indium tin oxide) film laminated on one side was also prepared. In an atmosphere of 40° C., an adhesive film test piece and a polyethylene terephthalate film were superimposed so that the cured layer and the ITO film were in contact with each other, based on the "adhesive tape, adhesive sheet test method" specified in JIS Z0237-2000. .
- This laminated film was allowed to stand for 1 day under conditions of a temperature of 60°C and a relative humidity of 90%, and then under an atmosphere of 25°C, the 180° peeling strength of the adhesive film test piece against the polyethylene terephthalate film was measured with a width of 25 mm. , and a tensile speed of 300 mm/min. The results were evaluated according to the following evaluation criteria.
- AA Greater than 9N/25mm.
- A More than 7N/25mm and 9N/25mm or less.
- B greater than 5N/25mm and less than or equal to 7N/25mm.
- C 5 N/25 mm or less.
- This laminated film is left for 14 days under conditions of a temperature of 60 ° C. and a relative humidity of 90%, and then under an atmosphere of 25 ° C., the same method as in ⁇ 5> above is used to test the adhesive film on the polyethylene terephthalate film. The 180° peel strength of the strips was measured.
- AA greater than 1N/25mm and less than or equal to 2N/25mm.
- ITO layer deterioration test 2 After peeling off the adhesive film test piece from the polyethylene terephthalate film by the test ⁇ 6>, the electrical resistance value (R40) of the ITO film in the polyethylene terephthalate film was measured. Before the test ⁇ 2>, the electrical resistance value (R0) of the ITO film in the polyethylene terephthalate film was measured in advance. Based on these, the change rate of the electrical resistance value of the ITO film was calculated by the following formula, and the results were evaluated according to the following evaluation criteria.
- Rate of change (%) [(R40) - (R0)] x 100/(R0) ⁇ Evaluation Criteria> AA: Less than 5% change.
- This laminated film was tested under the following conditions using a bending tester (planar body no-load U-shaped stretching tester manufactured by Yuasa System Co., Ltd.). - Bending radius: 3 mm. - Number of times of bending: 10,000 times. - Test temperature: 20°C.
- AA There is no bend mark, cloudiness, peeling, or lifting.
- A Slight flex marks, but no white turbidity, peeling, or lifting.
- B Bending marks and white turbidity are present, but neither peeling nor lifting is observed.
- C Bending marks, cloudiness, peeling and floating can be confirmed.
- polyfunctional (meth)acrylates and initiators in Tables 3 and 4 are as follows.
- - Polyfunctional (meth)acrylate (C-1) trimethylolpropane tri(meth)acrylate.
- C-2 dipentaerythritol pentaacrylate.
- D-1 trade name "Omnilad 184", IGM Resins B.V. V. 1-hydroxycyclohexyl phenyl ketone manufactured by Co., Ltd.;
- the adhesive films of Examples 11 to 17 have higher adhesiveness at low temperature (5 ° C.) lamination and high temperature (40 ° C.) lamination than the adhesive films of Comparative Examples 11 to 14. It can be seen that the adhesiveness of the film is excellent, the deterioration of the metal (oxide) film, particularly the ITO (indium tin oxide) film can be suppressed, and the bending resistance is excellent.
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Abstract
Description
(1)低温雰囲気下、例えば5℃雰囲気下で、粘着フィルムを適宜の対象物に貼り合せた場合の粘着力を高めることができ、かつ対象物から粘着フィルムを剥がした場合にのり残りが生じにくい。
(2)高温雰囲気下、例えば40℃雰囲気下で、粘着フィルムを対象物に貼り合せた場合の粘着力を高めることができ、かつ対象物から粘着フィルムを剥がした場合にのり残りが生じにくい。
(3)粘着フィルムを、金属又は金属酸化物からなる膜、特にITO(酸化インジウムスズ)からなる膜、を有する対象物の前記膜に貼り合せた後、この膜から粘着フィルムを剥がした場合の、膜の劣化を抑制できる。
(4)粘着フィルムは耐折り曲げ性に優れる。
本実施形態におけるアルキルアクリレート(a1)(以下、(a1)成分ともいう)は、上述のとおり、炭素数が4~8であるアルキル基を有する。(a1)成分は、例えば、n-ブチルアクリレート、ネオペンチルアクリレート、n-オクチルアクリレート、及び2-エチルヘキシルアクリレートよりなる群から選択される少なくとも一種を含有する。粘着性の観点から、(a1)成分は、好ましくは2-エチルヘキシルアクリレートとn-ブチルアクリレートとのうち少なくとも一方を含み、更に好ましくは2-エチルヘキシルアクリレートと、2-エチルヘキシルアクリレート及びn-ブチルアクリレートの組み合わせとのうち、少なくとも一方を含み、特に好ましくは2-エチルヘキシルアクリレートを含む。
本開示における水酸基を有する(メタ)アクリレート(a2)(以下、(a2)成分ともいう)は、水酸基を有し、かつ上記の(a1)成分を除く、(メタ)アクリル酸エステルである。(a2)成分は、例えば1級水酸基を有する(メタ)アクリレート(a21)(以下、(a21)成分ともいう)、2級水酸基を有する(メタ)アクリレート(a22)(以下、(a22)成分ともいう)、及び1級水酸基と2級水酸基とを有する(メタ)アクリレート(a23)(以下、(a23)成分ともいう)よりなる群から選択される少なくとも一種を含有する。
本開示におけるジアルキル(メタ)アクリルアミド(a3)(以下、(a3)成分ともいう)は、例えば、ジメチル(メタ)アクリルアミド及びジエチル(メタ)アクリルアミドよりなる群から選択される少なくとも一種を含有する。
本開示における共重合体(A)は、(a1)成分と(a2)成分と(a3)成分とを構成単量体として含む。構成単量体とは、重合することで共重合体(A)を構成する単量体である。すなわち、共重合体(A)は(a1)成分と(a2)成分と(a3)成分とを含む構成単量体の重合体である。換言すると、共重合体(A)は、(a1)成分の残基と、(a2)成分の残基と、(a3)成分の残基とを、構成単位として含む。
-治具:φ8mmパラレルプレート。
-試料厚さ:1mm。
-歪み:1%。
-周波数:1Hz。
-昇温速度:5℃/min。
-温度範囲:-50℃から180℃まで。
-装置:「HLC-8120GPC」[東ソー株式会社製]。
-カラム:「GuardcolumnHXL-H」(1本)及び「TSKgelGMHXL」(2本)[いずれも東ソー株式会社製]。
-試料溶液:0.25重量%のテトラヒドロフラン溶液。
-溶液注入量:100μl。
-流量:1ml/分。
-測定温度:40℃。
-検出装置:屈折率検出器。
-基準物質:標準ポリスチレン。
本実施形態の粘着剤用主剤(B)は、共重合体(A)を含有する。粘着剤用主剤(B)は、後述の粘着剤組成物(X)用の主剤として好適である。
本実施形態における多官能(メタ)アクリレート(C)(以下、(C)成分ともいう)は、分子中に複数の(メタ)アクリロイル基を有する化合物である。(メタ)アクリロイル基とは、アクリロイル基とメタクリロイル基とのうち一方又は両方のことである。(C)成分は、例えば、水酸基を1個有する2官能(メタ)アクリレート(C1)、水酸基を1個有する3~5官能(メタ)アクリレート(C2)及び水酸基を有さない3~6官能(メタ)アクリレート(C3)よりなる群から選択される少なくとも一種を含有する。
本実施形態の粘着剤組成物(X)は、共重合体(A)を含有する粘着剤用主剤(B)と、(C)成分とを、含有する。
本実施形態の粘着フィルムは、粘着剤組成物(X)の硬化物からなる硬化層を有する。硬化層の厚みは、好ましくは10μm以上200μm以下、更に好ましくは20μm以上100μm以下である。粘着フィルムは、例えば硬化層のみからなる。また粘着フィルムは、フィルム状の基材と、この基材に重なる硬化層とを備えてもよい。
撹拌機、温度計、還流冷却管、滴下ロート及び窒素ガス導入管を備えた反応容器に、溶剤としてのアセトン100重量部を仕込み57℃に昇温した。
モノマー配合液、開始剤溶液1及び開始剤溶液2の組成を、表1及び表2に示すとおりに変更し、それ以外は、実施例1と同様にして、共重合体(A-2)から(A-11)をそれぞれ含有する粘着剤用主剤(B-2)から(B-11)を得た。共重合体(A-2)から(A-11)の各々の重量平均分子量、グラス転移温度、水酸基濃度、アミド基濃度、モル比(β)及びカルボキシ基濃度を、表1及び表2に示す。
表3及び表4の「配合組成」に示す配合成分を、メカニカルスターラを利用して、15分間混合した。これにより、粘着剤組成物(X-1)から(X-11)を得た。
粘着フィルム(Yα)から、平面視寸法100mm×25mmの粘着フィルム試験片を切り出した。また、片面にITO(酸化インジウムスズ)膜が重ねられている厚み0.18mmのポリエチレンテレフタレートフィルムを用意した。5℃の雰囲気下で、JIS Z0237-2000に規定される「粘着テープ、粘着シート試験方法」に基づき、粘着フィルム試験片とポリエチレンテレフタレートフィルムとを硬化層とITO膜とが接触するように重ねた。続いて、粘着フィルム(Yα)の上にローラーで2kgの荷重をかけながら、このローラーを粘着フィルム(Yα)の上で1往復移動させた。これにより、粘着フィルム試験片とポリエチレンテレフタレートフィルムとを貼り合わせて積層フィルムを得た。
AA:9N/25mmより大きい。
A:7N/25mmより大きく、9N/25mm以下。
B:5N/25mmより大きく、7N/25mm以下。
C:5N/25mm以下。
上記<1>での場合と同じ方法で、積層フィルムを作製した。
<評価基準>
AA:1N/25mmより大きく、2N/25mm以下。
A:0.5N/25mmより大きく、1N/25mm以下。
B:0N/25mmより大きく、0.5N/25mm以下。
C:0N/25mm以下。
上記<2>の試験によってポリエチレンテレフタレートフィルムから粘着フィルム試験片を引き剥がした後、ポリエチレンテレフタレートフィルムにおけるITO膜の表面を目視で観察してのり残りの有無を確認し、その結果を以下の評価基準で評価した。
AA:のり残りが全くない。
A:のり残りがほとんどない。
B:のり残りがわずかにある。
C:のり残りがある。
上記<2>の試験によってポリエチレンテレフタレートフィルムから粘着フィルム試験片を引き剥がした後、ポリエチレンテレフタレートフィルムにおけるITO膜の電気抵抗値(R5)を測定した。また、上記<2>の試験の前に、予めポリエチレンテレフタレートフィルムにおけるITO膜の電気抵抗値(R0)を測定しておいた。これらに基づき、下記の式により、ITO膜の電気抵抗値の変化率を算出し、その結果を下記評価基準で評価した。
<評価基準>
AA:変化率5%未満。
A:変化率5%以上、10%未満。
B:変化率10%以上、20%未満。
C:変化率20%以上。
上記で得られた粘着フィルム(Yα)から、平面視寸法100mm×25mmの粘着フィルム試験片を切り出した。また、片面にITO(酸化インジウムスズ)膜が重ねられている厚み0.18mmのポリエチレンテレフタレートフィルムを用意した。40℃の雰囲気下で、JIS Z0237-2000に規定される「粘着テープ、粘着シート試験方法」に基づき、粘着フィルム試験片とポリエチレンテレフタレートフィルムとを硬化層とITO膜とが接触するように重ねた。続いて、粘着フィルム(Yα)の上にローラーで2kgの荷重をかけながら、このローラーを粘着フィルム(Yα)の上で1往復移動させた。これにより、粘着フィルム試験片とポリエチレンテレフタレートフィルムとを貼り合わせて積層フィルムを得た。
AA:9N/25mmより大きい。
A:7N/25mmより大きく、9N/25mm以下。
B:5N/25mmより大きく、7N/25mm以下。
C:5N/25mm以下。
上記<5>での場合と同じ方法で、積層フィルムを作製した。
<評価基準>
AA:1N/25mmより大きく、2N/25mm以下。
A:0.5N/25mmより大きく、1N/25mm以下。
B:0N/25mmより大きく、0.5N/25mm以下。
C:0N/25mm以下。
上記<6>の試験によってポリエチレンテレフタレートフィルムから粘着フィルム試験片を引き剥がした後、ポリエチレンテレフタレートフィルムにおけるITO膜の表面を目視で観察してのり残りの有無を確認し、その結果を以下の評価基準で評価した。
AA:のり残りが全くない。
A:のり残りがほとんどない。
B:のり残りがわずかにある。
C:のり残りがある。
上記<6>の試験によってポリエチレンテレフタレートフィルムから粘着フィルム試験片を引き剥がした後、ポリエチレンテレフタレートフィルムにおけるITO膜の電気抵抗値(R40)を測定した。また、上記<2>の試験の前に、予めポリエチレンテレフタレートフィルムにおけるITO膜の電気抵抗値(R0)を測定しておいた。これらに基づき、下記の式により、ITO膜の電気抵抗値の変化率を算出し、その結果を下記評価基準で評価した。
<評価基準>
AA:変化率5%未満。
A:変化率5%以上、10%未満。
B:変化率10%以上、20%未満。
C:変化率20%以上。
上記で得られた両面に剥離フィルムが重ねられた粘着フィルム(Yβ)から、一方の剥離フィルムを剥離した。次に、25℃の雰囲気下、粘着フィルム(Yβ)を厚み50μmのポリイミドフィルムに重ねた。続いて、粘着フィルム(Yβ)の上にローラーで2kgの荷重をかけながら、このローラーを粘着フィルム(Yβ)の上で1往復移動させた。これにより、粘着フィルム(Yβ)とポリイミドフィルムとを貼り合わせた。続いて、もう一方の剥離フィルムを粘着フィルム(Yβ)から剥離した。これにより、粘着フィルム(Yβ)とポリイミドフィルムが積層した積層フィルムを得た。
-折り曲げ時半径:3mm。
-折屈曲回数:1万回。
-試験温度:20℃。
AA:屈曲痕、白濁、剥がれ、及び浮きが全くない。
A:屈曲痕はわずかにあるが、白濁、剥がれ及び浮きはない。
B:屈曲痕及び白濁はあるが、剥がれ及び浮きはない。
C:屈曲痕、白濁、剥がれ及び浮きが確認できる。
-多官能(メタ)アクリレート(C-1):トリメチロールプロパントリ(メタ)アクリレート。
-多官能(メタ)アクリレート(C-2):ジペンタエリスリトールペンタアクリレート。
-開始剤(D-1):商品名「オムニラッド184」、IGM Resins B.V.社製、1-ヒドロキシシクロヘキシルフェニルケトン。
Claims (10)
- 炭素数が4~8であるアルキル基を有するアルキルアクリレート(a1)と、水酸基を有する(メタ)アクリレート(a2)と、各々の炭素数が1~2である二つのアルキル基を有するジアルキル(メタ)アクリルアミド(a3)とを構成単量体として含む共重合体(A)を含有する、
粘着剤用主剤。 - 前記共重合体(A)の水酸基濃度が、0.01モル/kg以上1.0モル/kg以下である、
請求項1記載の粘着剤用主剤。 - 前記共重合体(A)の有する2級水酸基に対する1級水酸基のモル比が0/100から90/10までである、
請求項1記載の粘着剤用主剤。 - 前記共重合体(A)のアミド基濃度が、0.01モル/kg以上0.5モル/kg以下である、
請求項1記載の粘着剤用主剤。 - 前記共重合体(A)のカルボキシ基濃度が、0モル/kg以上0.35モル/kg以下である、
請求項1記載の粘着剤用主剤。 - 前記共重合体(A)のガラス転移温度が-50℃以上-30℃以下である、
請求項1記載の粘着剤用主剤。 - 前記共重合体(A)の重量平均分子量が、300,000以上1,200,000以下である、
請求項1記載の粘着剤用主剤。 - 請求項1~7のいずれか一項に記載の粘着剤用主剤と、
多官能(メタ)アクリレート(C)とを含有する、
粘着剤組成物。 - 前記共重合体(A)と前記多官能(メタ)アクリレート(C)との合計重量に対して、前記共重合体(A)の割合が75重量%以上99.9重量%以下、かつ前記多官能(メタ)アクリレート(C)の割合が0.1重量%以上25重量%以下である、
請求項8に記載の粘着剤組成物。 - 請求項8に記載の粘着剤組成物の硬化物からなる硬化層を有する、
粘着フィルム。
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JP2017203100A (ja) * | 2016-05-11 | 2017-11-16 | 昭和電工株式会社 | 粘着シート用硬化性組成物、及びそれを用いた粘着シート |
CN110467890A (zh) * | 2019-07-16 | 2019-11-19 | 广州慧谷工程材料有限公司 | 压敏胶带及其制备方法、用于制备压敏胶带的树脂组合物 |
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JP2016183276A (ja) * | 2015-03-26 | 2016-10-20 | 積水化学工業株式会社 | 粘着剤組成物及び粘着テープ |
JP2017106000A (ja) * | 2015-11-30 | 2017-06-15 | 積水化学工業株式会社 | 粘着剤組成物及び粘着シート |
JP2017203100A (ja) * | 2016-05-11 | 2017-11-16 | 昭和電工株式会社 | 粘着シート用硬化性組成物、及びそれを用いた粘着シート |
CN110467890A (zh) * | 2019-07-16 | 2019-11-19 | 广州慧谷工程材料有限公司 | 压敏胶带及其制备方法、用于制备压敏胶带的树脂组合物 |
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