WO2011115224A1 - Composition d'adhésif autocollant pour éléments optiques et ruban adhésif autocollant pour éléments optiques - Google Patents

Composition d'adhésif autocollant pour éléments optiques et ruban adhésif autocollant pour éléments optiques Download PDF

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Publication number
WO2011115224A1
WO2011115224A1 PCT/JP2011/056467 JP2011056467W WO2011115224A1 WO 2011115224 A1 WO2011115224 A1 WO 2011115224A1 JP 2011056467 W JP2011056467 W JP 2011056467W WO 2011115224 A1 WO2011115224 A1 WO 2011115224A1
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WIPO (PCT)
Prior art keywords
sensitive adhesive
pressure
weight
monomer
adhesive composition
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PCT/JP2011/056467
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English (en)
Japanese (ja)
Inventor
耕平 丸尾
智基 戸田
康晴 永井
拓道 杉原
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積水化学工業株式会社
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Application filed by 積水化学工業株式会社 filed Critical 積水化学工業株式会社
Priority to CN201180013744.1A priority Critical patent/CN102791817B/zh
Priority to KR1020127026981A priority patent/KR101938894B1/ko
Priority to JP2011513787A priority patent/JP5727371B2/ja
Publication of WO2011115224A1 publication Critical patent/WO2011115224A1/fr

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Classifications

    • 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
    • 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
    • C09J133/14—Homopolymers or copolymers of esters of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen
    • 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
    • C09J139/00—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 a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen; Adhesives based on derivatives of such polymers
    • C09J139/04—Homopolymers or copolymers of monomers containing heterocyclic rings having nitrogen as ring member
    • C09J139/06—Homopolymers or copolymers of N-vinyl-pyrrolidones
    • 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
    • C09J7/10—Adhesives in the form of films or foils without carriers
    • 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]
    • C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • C09J7/385—Acrylic polymers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • 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

Definitions

  • the present invention relates to a pressure-sensitive adhesive composition for an optical member that can suppress whitening that occurs under high temperature and high humidity and realize high reliability. Moreover, this invention relates to the adhesive tape for optical members manufactured using this adhesive composition for optical members.
  • Display panels are used in various fields, and particularly in mobile phones, personal digital assistants, etc., they are used not only for image display devices but also for input devices.
  • the display panel is bonded to a protective plate, a touch panel, an optical filter, or the like that protects the surface with a highly transparent adhesive such as an acrylic adhesive or an adhesive tape. .
  • Patent Document 1 discloses an acrylic transparent pressure-sensitive adhesive composition obtained by polymer blending an ABA triblock copolymer composed of an acrylic ester and a methacrylic ester and a resin having a hydroxyl group. It is disclosed.
  • the acrylic transparent pressure-sensitive adhesive composition described in the same document has transparency without whitening even when exposed to an environment such as a high-temperature and high-humidity environment, a hot-water immersion environment, or a boiling environment for a long time. It is stated that it can be maintained.
  • the acrylic transparent pressure-sensitive adhesive composition described in Patent Document 1 has a low molecular weight resin having a hydroxyl group to be blended, and therefore has such properties as pressure-sensitive adhesive properties and heat resistance that are originally required for a pressure-sensitive adhesive or pressure-sensitive adhesive tape. It ’s not enough. Accordingly, there is a need for a new pressure-sensitive adhesive or pressure-sensitive adhesive tape that can simultaneously suppress whitening that occurs under high temperature and high humidity without reducing the reliability of the pressure-sensitive adhesive or pressure-sensitive adhesive tape.
  • An object of this invention is to provide the adhesive composition for optical members which can suppress the whitening which arises under high temperature, high humidity, and can implement
  • the present invention is an adhesive composition for an optical member containing an acrylic copolymer, the acrylic copolymer comprising 1 to 25% by weight of 2-hydroxyethyl acrylate, 1 to 25% by weight of N-vinylpyrrolidone, 0.5 to 30% by weight of a monomer having a structure represented by the following general formula (1-1), or 0.1 to 30% by weight of a monomer having a structure represented by the following general formula (1-2) It is the adhesive composition for optical members obtained by superposing
  • R 1 represents a hydrogen atom or a methyl group
  • R 2 represents a hydrogen atom or an alkyl group having less than 3 carbon atoms
  • n represents an integer of 8 to 45.
  • R 3 represents a hydrogen atom or a methyl group
  • R 4 represents an alkyl group having 3 to 30 carbon atoms
  • m represents an integer of 8 to 45.
  • the present inventors use a highly hydrophilic monomer as a monomer constituting the acrylic copolymer, so that it is exposed to room temperature after being exposed to high temperature and high humidity. It was found that water was finely dispersed when it was returned to, and as a result, whitening could be suppressed.
  • the present inventors have found that many of the highly hydrophilic monomers increase the glass transition temperature (Tg) of the acrylic copolymer more than necessary and are not suitable for the pressure-sensitive adhesive composition, whereas 2-hydroxyethyl acrylate, By using N-vinylpyrrolidone or a specific monomer having a polyethylene oxide chain at a predetermined ratio, whitening that occurs under high temperature and high humidity can be suppressed, and high reliability can be realized. It discovered that the adhesive composition for members was obtained, and came to complete this invention.
  • the pressure-sensitive adhesive composition for optical members of the present invention contains an acrylic copolymer.
  • the acrylic copolymer is composed of 1 to 25% by weight of 2-hydroxyethyl acrylate, 1 to 25% by weight of N-vinylpyrrolidone, and 0.5 to 30% by weight of a monomer having a structure represented by the following general formula (1-1) %, Or a mixed monomer containing 0.1 to 30% by weight of a monomer having a structure represented by the following general formula (1-2).
  • R 1 represents a hydrogen atom or a methyl group
  • R 2 represents a hydrogen atom or an alkyl group having less than 3 carbon atoms
  • n represents an integer of 8 to 45.
  • R 3 represents a hydrogen atom or a methyl group
  • R 4 represents an alkyl group having 3 to 30 carbon atoms
  • m represents an integer of 8 to 45.
  • 2-hydroxyethyl acrylate, N-vinylpyrrolidone, a monomer having a structure represented by the general formula (1-1), and a monomer having a structure represented by the general formula (1-2) are hydrophilic groups. And has high hydrophilicity. Therefore, when the above-mentioned mixed monomer contains these monomers in a proportion within the above range, the pressure-sensitive adhesive composition for an optical member of the present invention can absorb water when it is returned to room temperature after being exposed to high temperature and high humidity. Fine dispersion is achieved, and as a result, whitening can be suppressed.
  • the monomer is also referred to as “monomer having a hydrophilic group”. Further, the monomer having a hydrophilic group does not unnecessarily increase the glass transition temperature (Tg) of the acrylic copolymer, and adversely affects the reliability of the pressure-sensitive adhesive composition for optical members of the present invention. There is nothing.
  • the adhesive composition for optical members of the present invention contains a monomer having a whitening that occurs under high temperature and high humidity even when a metal thin film containing a metal or metal oxide such as ITO is used as an adherend. Can be suppressed.
  • a highly hydrophilic monomer that has an effect of suppressing whitening and does not adversely affect reliability
  • a highly hydrophilic monomer that has an effect of suppressing whitening and does not adversely affect reliability
  • 4-hydroxybutyl acrylate (4- HBA) 3-hydroxypropyl acrylate (3-HPA)
  • 6-hydroxyhexyl acrylate (6-HHA) and the like for example, 4-hydroxybutyl acrylate (4- HBA), 3-hydroxypropyl acrylate (3-HPA), 6-hydroxyhexyl acrylate (6-HHA) and the like.
  • the mixed monomer may contain these highly hydrophilic monomers.
  • a pressure-sensitive adhesive composition for an optical member having high initial adhesiveness and capable of maintaining high adhesiveness even after time has been obtained, and further, a metal such as ITO or a metal A monomer having a structure represented by the above general formula (1-1) can be more effectively suppressed whitening that occurs under high temperature and high humidity when a metal thin film containing an oxide is used as an adherend.
  • a monomer having a structure represented by the general formula (1-2) is preferable.
  • the monomer having the hydrophilic group is 2-hydroxyethyl acrylate or N-vinylpyrrolidone.
  • the monomer having a hydrophilic group is a monomer having a structure represented by the general formula (1-1) or a monomer having a structure represented by the general formula (1-2). Therefore, it is possible to prevent the gelation of the pressure-sensitive adhesive composition for optical members from proceeding rapidly depending on the type or amount of the crosslinking agent, and the type and amount of the crosslinking agent can be easily controlled.
  • the number of ethylene oxide repeats is 8 for the lower limit and 8 for the upper limit. 45.
  • the number of ethylene oxide repeats is less than 8
  • the resulting pressure-sensitive adhesive composition for optical members cannot sufficiently suppress whitening that occurs under high temperature and high humidity.
  • the number of ethylene oxide repeats exceeds 45, the resulting pressure-sensitive adhesive composition for optical members cannot sufficiently suppress whitening that occurs under high temperature and high humidity.
  • the ethylene oxide repeat number exceeds 45, a monomer having a structure represented by the general formula (1-1) or a monomer having a structure represented by the general formula (1-2) Compatibility with other main components such as monomers decreases, and the resulting pressure-sensitive adhesive composition for optical members has reduced adhesive strength. Since the repetition number of the ethylene oxide can more effectively suppress whitening that occurs under high temperature and high humidity, the preferable lower limit is 13 and the preferable upper limit is 40. The number of ethylene oxide repeats is particularly preferably 30. The repeating number of ethylene oxide is represented by n in the general formula (1-1) and represented by m in the general formula (1-2).
  • the terminal group of the polyethylene oxide chain is a hydrogen atom or an alkyl group having less than 3 carbon atoms. Especially, since the adhesive composition for optical members which can suppress whitening also on conditions of higher temperature and humidity is obtained, an alkyl group with less than 3 carbon atoms is preferable.
  • the terminal group of the polyethylene oxide chain is represented by R 2 in the general formula (1-1).
  • the end group of the polyethylene oxide chain is an alkyl group having 3 to 30 carbon atoms.
  • the terminal group of the polyethylene oxide chain is preferably an alkyl group having 18 carbon atoms because a pressure-sensitive adhesive composition for an optical member that can suppress whitening even under conditions of higher temperature and higher humidity is obtained.
  • the end group of the polyethylene oxide chain is represented by R 4 in the general formula (1-2).
  • the obtained pressure-sensitive adhesive composition for optical members cannot sufficiently suppress whitening that occurs under high temperature and high humidity.
  • the ratio of the monomer having the hydrophilic group in the mixed monomer is too large, the pressure-sensitive adhesive layer made of the obtained pressure-sensitive adhesive composition for optical members has reduced initial wettability, and adhesion to an adherend. Lower and less reliable.
  • the proportion of 2-hydroxyethyl acrylate or N-vinylpyrrolidone in the mixed monomer is preferably 5% by weight, more preferably 8% by weight, more preferably 20% by weight, and still more preferably 15% by weight. is there.
  • the proportion of the monomer having the structure represented by the general formula (1-1) in the mixed monomer or the monomer having the structure represented by the general formula (1-2) is preferably 1% by weight as a lower limit.
  • a more preferred lower limit is 2% by weight, a preferred upper limit is 20% by weight, and a more preferred upper limit is 15% by weight.
  • the mixed monomer preferably contains 10 to 60% by weight of a monomer having a bicyclo ring structure and one olefinic double bond.
  • the pressure-sensitive adhesive composition for an optical member obtained has dramatically improved adhesive strength to an adherend. Such an improvement in adhesive strength exhibits a particularly excellent effect when the adherend is a polycarbonate plate or an acrylic plate.
  • the polycarbonate plate and the acrylic plate easily absorb moisture, and the moisture is vaporized under high temperature conditions to generate outgas. Therefore, when the adherend is a polycarbonate plate or an acrylic plate, bubbles grow due to the gas pressure of the outgas under high temperature conditions, and the interface between the polycarbonate plate or the acrylic plate and the pressure-sensitive adhesive layer tends to float off.
  • the mixed monomer contains a monomer having the bicyclo ring structure and one olefinic double bond
  • the resulting pressure-sensitive adhesive composition for an optical member has dramatically improved adhesion to an adherend, Even when the adherend is a polycarbonate plate or an acrylic plate, it is possible to suppress the floating peeling that occurs at the interface between the adherend and the pressure-sensitive adhesive layer.
  • the polycarbonate plate and the acrylic plate are used for, for example, a touch panel of an input device such as a mobile phone or a portable information terminal.
  • the bicyclo ring structure is not particularly limited, and examples of the functional group having the bicyclo ring structure include a bicyclo [1.1.0] butyl group, a bicyclo [1.1.1] pentyl group, and a bicyclo [2.1.
  • the said substitution may be one place and may be multiple places.
  • a functional group which has the said bicyclo ring structure a norbornyl group and an isobornyl group are preferable and an isobornyl group is especially preferable.
  • the olefinic double bond is not particularly limited, and examples of the functional group having the olefinic double bond include a (meth) acryloyl group, a vinyl group, and an allyl group. Of these, a (meth) acryloyl group is preferred as the functional group having the olefinic double bond.
  • the monomer having the bicyclo ring structure and one olefinic double bond for example, isobornyl (meth) acrylate having an isobornyl group and a (meth) acryloyl group is preferable.
  • the resulting pressure-sensitive adhesive composition for optical members has a reduced adhesive force to the adherend.
  • reliability may be reduced.
  • the ratio of the monomer having the bicyclo ring structure and one olefinic double bond in the mixed monomer exceeds 60% by weight, the glass transition temperature of the resulting acrylic copolymer may increase.
  • the pressure-sensitive adhesive layer made of the pressure-sensitive adhesive composition for optical members containing such an acrylic copolymer the adhesiveness to the adherend is lowered, and the reliability may be lowered.
  • the ratio of the monomer having the bicyclo ring structure and one olefinic double bond in the mixed monomer is more preferably a lower limit of 15% by weight, a still more preferable lower limit of 25% by weight, and a more preferable upper limit of 55% by weight, still more preferable.
  • the upper limit is 40% by weight.
  • the mixed monomer preferably contains 30 to 80% by weight of a (meth) acrylic acid ester monomer having a structure represented by the following general formula (2).
  • the (meth) acrylic acid ester monomer having a structure represented by the following general formula (2) is also simply referred to as “(meth) acrylic acid ester monomer”.
  • R 5 represents a hydrogen atom or a methyl group
  • R 6 represents an alkyl group having 3 to 14 carbon atoms.
  • the hydrogen atom of the alkyl group of R 6 may be substituted with a cycloalkyl group.
  • the glass transition temperature of the resulting acrylic copolymer may be increased.
  • the pressure-sensitive adhesive layer made of the pressure-sensitive adhesive composition for an optical member containing such an acrylic copolymer may deteriorate in reliability due to a decrease in adhesion to an adherend.
  • the alkyl group of R 6 preferably has 4 to 12 carbon atoms.
  • the hydrogen atom of the alkyl group of R 6 may be substituted with a cycloalkyl group.
  • the cycloalkyl group is not particularly limited, and examples thereof include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, and a cyclooctyl group.
  • the (meth) acrylic acid ester monomer is not particularly limited.
  • the pressure-sensitive adhesive layer made of the obtained pressure-sensitive adhesive composition for optical members is improved in cohesive force, initial adhesiveness, adhesion and the like.
  • the (meth) acrylic acid ester monomer includes 2-ethylhexyl (meth) acrylate, octyl (meth) acrylate and butyl ( It is preferable to contain at least one (meth) acrylic acid ester monomer selected from the group consisting of (meth) acrylates.
  • the resulting pressure-sensitive adhesive layer made of the pressure-sensitive adhesive composition for optical members has a high low-temperature elastic modulus and initial wettability. May decrease, adhesion to an adherend may decrease, and reliability may decrease.
  • the proportion of the (meth) acrylic acid ester monomer in the mixed monomer exceeds 80% by weight, the pressure-sensitive adhesive layer made of the resulting pressure-sensitive adhesive composition for optical members has reduced cohesive force and processability.
  • a more preferable lower limit is 40% by weight, and a more preferable upper limit is 65% by weight.
  • the mixed monomer may contain a monomer having a carboxyl group and one olefinic double bond.
  • the mixed monomer contains a monomer having the carboxyl group and one olefinic double bond
  • the resulting acrylic copolymer has an increased intermolecular interaction.
  • the pressure-sensitive adhesive layer made of the pressure-sensitive adhesive composition for optical members containing such an acrylic copolymer has improved cohesive strength.
  • the said mixed monomer does not need to contain the monomer which has the said carboxyl group and one olefinic double bond.
  • the monomer which has the said carboxyl group and one olefinic double bond is not specifically limited, For example, (meth) acrylic acid, (meth) acryloyl acetic acid, (meth) acryloyl propionic acid, (meth) acryloyl butyric acid, (meth ) Unsaturated monocarboxylic acids such as acryloylpentanoic acid and crotonic acid, and unsaturated dicarboxylic acids such as maleic acid, fumaric acid, citraconic acid, mesaconic acid and itaconic acid.
  • the ratio of the monomer having the carboxyl group and one olefinic double bond in the mixed monomer is not particularly limited, but is preferably 2% by weight or less. When the ratio of the monomer having the carboxyl group and one olefinic double bond exceeds 2% by weight, the resulting pressure-sensitive adhesive composition for an optical member is obtained from a metal thin film containing a metal such as ITO or a metal oxide. In the case of an adherend, the metal thin film may be easily deteriorated.
  • the ratio of the monomer having the carboxyl group and one olefinic double bond in the mixed monomer is more preferably 1% by weight or less, and further preferably 0.5% by weight or less.
  • the method for producing the acrylic copolymer is not particularly limited.
  • the monomer having the hydrophilic group and the monomer having the bicyclo ring structure and one olefinic double bond to be blended as necessary.
  • a method of radical polymerization of a mixed monomer containing other monomers in the presence of a polymerization initiator is not particularly limited.
  • the said polymerization method is not specifically limited, For example, conventionally well-known polymerization methods, such as solution polymerization, emulsion polymerization, suspension polymerization, block polymerization, are mentioned.
  • the solvent used for the solution polymerization is not particularly limited, and examples thereof include ethyl acetate, toluene, dimethyl sulfoxide, ethanol, acetone, diethyl ether and the like.
  • the compounding quantity of the solvent used for the said solution polymerization is not specifically limited,
  • the preferable minimum with respect to 100 weight part of said mixed monomers is 25 weight part, and a preferable upper limit is 300 weight part.
  • the blending amount of the solvent is less than 25 parts by weight, the molecular weight distribution of the resulting acrylic copolymer may be broadened.
  • the pressure-sensitive adhesive layer made of the pressure-sensitive adhesive composition for an optical member containing such an acrylic copolymer may reduce the adhesive force and cohesive force with respect to the adherend, thereby reducing the reliability.
  • the amount of the solvent exceeds 300 parts by weight, it is necessary to remove the solvent when preparing the pressure-sensitive adhesive composition for an optical member using the resulting acrylic copolymer and forming the pressure-sensitive adhesive layer. May be.
  • the said polymerization initiator is not specifically limited, For example, a persulfate, an organic peroxide, an azo compound etc. are mentioned. Among these, an azo compound is preferable in consideration of the influence on the metal thin film when a metal thin film containing a metal such as ITO or a metal oxide is used as an adherend.
  • the persulfate is not particularly limited, and examples thereof include potassium persulfate, sodium persulfate, and ammonium persulfate.
  • the organic peroxide is not particularly limited.
  • the azo compound is not particularly limited.
  • These polymerization initiators may be used alone or in combination of two or more.
  • the preferable minimum with respect to 100 weight part of said mixed monomers is 0.02 weight part, and a preferable upper limit is 0.5 weight part.
  • a preferable upper limit is 0.5 weight part.
  • the blending amount of the polymerization initiator is less than 0.02 parts by weight, the polymerization reaction may be insufficient, or the polymerization reaction may take a long time.
  • the blending amount of the polymerization initiator exceeds 0.5 parts by weight, the weight average molecular weight of the resulting acrylic copolymer may become too low or the molecular weight distribution may become too wide.
  • the pressure-sensitive adhesive layer made of the pressure-sensitive adhesive composition for an optical member containing such an acrylic copolymer may reduce the adhesive force and cohesive force with respect to the adherend, thereby reducing the reliability.
  • a preferable lower limit is 200,000 and a preferable upper limit is 1,500,000.
  • the pressure-sensitive adhesive layer made of the obtained pressure-sensitive adhesive composition for optical members may have a reduced high-temperature elastic modulus and a reduced reliability.
  • the weight average molecular weight of the acrylic copolymer exceeds 1,500,000, the fluidity of the acrylic copolymer may be lowered.
  • the adhesiveness to the adherend is lowered, and the reliability may be lowered.
  • the more preferable lower limit of the weight average molecular weight of the acrylic copolymer is 300,000, the still more preferable lower limit is 400,000, the still more preferable lower limit is 500,000, the more preferable upper limit is 1,200,000, and the still more preferable upper limit is 900,000.
  • a preferable upper limit is 650,000.
  • a weight average molecular weight means the value measured by gel permeation chromatography (GPC) method and calculated
  • GPC gel permeation chromatography
  • the diluted solution obtained by diluting the acrylic copolymer 100 times with tetrahydrofuran (THF) is filtered through a filter, and the obtained filtrate is filtered with a column (for example, a product name manufactured by Waters).
  • the weight average molecular weight can be determined by polystyrene conversion using a “2690 Separations Model” or the like.
  • the solution containing the acrylic copolymer is a low viscosity solution. Therefore, when forming the pressure-sensitive adhesive layer using the pressure-sensitive adhesive composition for optical members containing the acrylic copolymer, the amount of the solvent required for coating is small, and the handleability is excellent. Moreover, it is easy to produce a thick adhesive layer, and the adhesive force of the adhesive layer to the adherend can be increased.
  • the viscosity of the pressure-sensitive adhesive composition solution for an optical member containing the acrylic copolymer is not particularly limited, but a B-type viscometer (“B8U-type viscometer”, manufactured by Tokyo Keiki Co., Ltd.) is used at a temperature of 25 ° C.
  • the preferable lower limit of the measured viscosity is 500 mPa ⁇ s, and the preferable upper limit is 100,000 mPa ⁇ s.
  • the pressure-sensitive adhesive composition for an optical member of the present invention may contain a crosslinking agent in addition to the acrylic copolymer.
  • a crosslinked structure can be formed in the acrylic copolymer.
  • the gel fraction of the adhesive layer which consists of an adhesive composition for optical members obtained by adjusting the kind or quantity of the said crosslinking agent suitably can be adjusted.
  • the said crosslinking agent is not specifically limited, For example, an isocyanate type crosslinking agent, an aziridine type crosslinking agent, an epoxy-type crosslinking agent, a metal chelate type crosslinking agent etc. are mentioned.
  • the adhesive composition for optical members of this invention is at least 1 bridge
  • an aliphatic isocyanate type crosslinking agent is preferable.
  • examples of commercially available products include Coronate HX (manufactured by Nippon Polyurethane Co., Ltd.).
  • examples of commercially available products include Coronate HX (manufactured by Nippon Polyurethane Co., Ltd.).
  • examples of commercially available products include Denacol EX212 and Denacol EX214 (both manufactured by Nagase ChemteX Corporation).
  • the preferable minimum with respect to 100 weight part of said acrylic copolymers is 0.1 weight part, and a preferable upper limit is 10 weight part.
  • the blending amount of the crosslinking agent is less than 0.1 parts by weight, the acrylic copolymer is insufficiently crosslinked, and the pressure-sensitive adhesive layer made of the resulting pressure-sensitive adhesive composition for optical members has reduced cohesive force. As a result, workability may be reduced.
  • the blending amount of the crosslinking agent exceeds 10 parts by weight, the pressure-sensitive adhesive layer made of the pressure-sensitive adhesive composition for optical members is deteriorated in the adhesive strength and initial adhesiveness to the adherend, and the reliability is lowered.
  • the more preferable minimum with respect to 100 weight part of said acrylic copolymers is 0.3 weight part, and a more preferable upper limit is 3.0 weight part.
  • the pressure-sensitive adhesive composition for optical members of the present invention may further contain a tackifier resin.
  • the tackifying resin is not particularly limited, and examples thereof include a xylene resin, a phenol resin, a rosin resin, and a terpene resin. These tackifier resins may be used alone or in combination of two or more. Of these, a xylene resin is preferable, and an alkylphenol reaction product of the xylene resin is more preferable.
  • a hydrogenated resin is preferable. By using such a hydrogenated resin, the pressure-sensitive adhesive composition for an optical member obtained has increased transparency.
  • the pressure-sensitive adhesive composition for optical members of the present invention may further contain a silane coupling agent.
  • a silane coupling agent By containing the said silane coupling agent, the adhesive layer which consists of an adhesive composition for optical members obtained improves the adhesiveness with respect to a to-be-adhered body.
  • the silane coupling agent is not particularly limited.
  • the pressure-sensitive adhesive composition for an optical member of the present invention may further contain a conventionally known additive as necessary within the range not impairing the effects of the present invention.
  • the said additive is not specifically limited, For example, a filler, anti-aging agent, etc. are mentioned.
  • the method for producing the pressure-sensitive adhesive composition for optical members of the present invention is not particularly limited.
  • the acrylic copolymer, and, if necessary, the crosslinking agent, the tackifying resin, the silane coupling agent, The method of mixing and stirring the said additive is mentioned.
  • the application of the pressure-sensitive adhesive composition for optical members of the present invention is not particularly limited, and can be applied to various optical members.
  • the adhesive tape for optical members which has an adhesive layer which consists of an adhesive composition for optical members of this invention is also one of this invention.
  • the gel fraction of the said adhesive layer is not specifically limited, although it can adjust suitably according to the use of the adhesive tape for optical members, a preferable minimum is 30 weight% and a preferable upper limit is 95 weight%.
  • a preferable minimum is 30 weight% and a preferable upper limit is 95 weight%.
  • the gel fraction of the pressure-sensitive adhesive layer is less than 30% by weight, the processability of the pressure-sensitive adhesive tape for optical members may be lowered.
  • the gel fraction of the pressure-sensitive adhesive layer exceeds 95% by weight, the initial wettability of the pressure-sensitive adhesive layer is lowered, the adhesion to the adherend is lowered, and the reliability may be lowered.
  • the minimum with a more preferable gel fraction of the said adhesive layer is 40 weight%, and a more preferable upper limit is 90 weight%.
  • the gel fraction can be measured by the following method. First, the pressure-sensitive adhesive tape for optical members of the present invention is cut into a flat rectangular shape of 50 mm ⁇ 25 mm to produce a test piece. The pressure-sensitive adhesive layer of the obtained test piece was scraped with a spoon to prepare a pressure-sensitive adhesive lump. After the pressure-sensitive adhesive lump was immersed in ethyl acetate at 23 ° C. for 24 hours, a 200-mesh stainless mesh was The mass of the pressure-sensitive adhesive is taken out from the ethyl acetate and dried at 110 ° C. for 1 hour. And the weight of the lump of the adhesive after drying is measured, and a gel fraction is computed using following formula (1).
  • the thickness of the said adhesive layer is not specifically limited, A preferable minimum is 5 micrometers and a preferable upper limit is 1 mm.
  • a more preferable lower limit of the thickness of the pressure-sensitive adhesive layer is 10 ⁇ m, a further preferable lower limit is 20 ⁇ m, a more preferable upper limit is 500 ⁇ m, and a further preferable upper limit is 300 ⁇ m.
  • the pressure-sensitive adhesive tape for optical members of the present invention may be a non-support type that does not have a base material, or may be a support type in which pressure-sensitive adhesive layers are formed on both surfaces of the base material.
  • the base material is not particularly limited as long as it is a transparent base material.
  • the base material is made of a transparent resin such as acrylic, olefin, polycarbonate, vinyl chloride, ABS, polyethylene terephthalate (PET), nylon, urethane, and polyimide. Examples thereof include a sheet, a sheet having a network structure, and a sheet having holes.
  • the thickness of the said base material is not specifically limited, A preferable minimum is 2 micrometers and a preferable upper limit is 200 micrometers.
  • a preferable minimum is 2 micrometers and a preferable upper limit is 200 micrometers.
  • the thickness of the base material is less than 2 ⁇ m, the strength of the obtained pressure-sensitive adhesive tape for optical members is insufficient, and it may be torn or difficult to handle.
  • the thickness of the base material exceeds 200 ⁇ m, the base material is too strong, and the followability to the step of the obtained pressure-sensitive adhesive tape for optical members may be deteriorated.
  • a more preferable lower limit of the thickness of the substrate is 5 ⁇ m, and a more preferable upper limit is 100 ⁇ m.
  • the method for producing the pressure-sensitive adhesive tape for optical members of the present invention is not particularly limited.
  • the pressure-sensitive adhesive layer is formed by coating the pressure-sensitive adhesive composition for optical members of the present invention on the release paper or release film of the release film. Then, on the obtained pressure-sensitive adhesive layer, a newly prepared release paper or release film with a release treatment surface in contact with the pressure-sensitive adhesive layer was overlaid to obtain a laminate, and then the obtained laminate Examples include a method of pressing the body with a rubber roller or the like.
  • the monomer having the hydrophilic group, the monomer having the bicyclo ring structure and one olefinic double bond, which are blended as necessary, etc. A method in which a mixed monomer containing other monomers is radically polymerized by bulk polymerization to produce the above acrylic copolymer and at the same time to tape formation at a stretch is suitably used.
  • the bulk polymerization is preferably photopolymerization because the heat of polymerization is easily removed and the reaction is easily controlled.
  • a monomer composition containing the above-mentioned mixed monomer, photopolymerization initiator, and, if necessary, an additive and the like and containing no solvent After forming the monomer layer by coating on the release treatment surface of the transparent synthetic resin film whose surface was release-treated, another transparent composition with one surface being release-treated on this monomer layer A method in which the mixed monomer is radically polymerized by superimposing the release treatment surfaces of the resin film and irradiating the monomer layer with light such as ultraviolet irradiation through the synthetic resin film is preferably used.
  • the pressure-sensitive adhesive tape for optical members of the present invention is produced by photopolymerization, a cross-linked structure can be formed simultaneously with the polymerization, so the mixed monomer is a polyfunctional (meth) acrylate having two or more polymerizable functional groups. It is preferable to contain.
  • the polyfunctional (meth) acrylate is not particularly limited.
  • examples include di (meth) acrylate, trimethylolpropane triacrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, polyurethane di (meth) acrylate, and polyester di (meth) acrylate.
  • 1,6-hexanediol diacrylate, polypropylene glycol diacrylate, hydrogenated polybutadiene diacrylate, polyurethane diacrylate, and polyester diacrylate are preferred because the pressure dispersion of the resulting pressure-sensitive adhesive layer is small and excellent in adhesive performance. Is preferred.
  • the compounding quantity of the said polyfunctional (meth) acrylate is not specifically limited, The preferable minimum in the said mixed monomer is 0.02 weight%, A preferable upper limit is 5 % By weight.
  • the blending amount of the polyfunctional (meth) acrylate is less than 0.02% by weight, the acrylic copolymer is insufficiently cross-linked, and the resulting pressure-sensitive adhesive layer has reduced cohesion and processability. There are things to do.
  • the blending amount of the polyfunctional (meth) acrylate is more than 5% by weight, the pressure-sensitive adhesive layer obtained may have reduced adhesive strength and initial adhesiveness to the adherend, resulting in reduced reliability.
  • the compounding quantity of the said polyfunctional (meth) acrylate the more preferable minimum in the said mixed monomer is 0.05 weight%, and a more preferable upper limit is 3 weight%.
  • the photopolymerization initiator is not particularly limited, and examples thereof include ketone photopolymerization such as 4- (2-hydroxyethoxy) phenyl (2-hydroxy-2-propyl) ketone (trade name “Darocur 2959” manufactured by Merck).
  • Initiator ⁇ -hydroxy- ⁇ , ⁇ '-dimethyl-acetophenone (Merck, trade name “Darocur 1173”), methoxyacetophene, 2,2-dimethoxy-2-phenylacetophene (Ciba Geigy, trade name) "Irgacure 651”), 2-hydroxy-2-cyclohexyl acetophenone (product name "Irgacure 184" manufactured by Ciba Geigy Co., Ltd.), etc., ketal photopolymerization initiators such as benzyldimethyl ketal, halogenated ketones , Acyl phosphinoxide, acyl phosphonate and the like.
  • the preferable minimum with respect to 100 weight part of said mixed monomers is 0.01 weight part, and a preferable upper limit is 5 weight part.
  • a preferable upper limit is 5 weight part.
  • the blending amount of the photopolymerization initiator is less than 0.01 parts by weight, the polymerization of the mixed monomer becomes incomplete, and the obtained pressure-sensitive adhesive layer has the necessary physical properties due to a decrease in cohesive force. It may not be possible. If the blending amount of the photopolymerization initiator exceeds 5 parts by weight, the amount of radicals generated during light irradiation increases, the number average molecular weight of the resulting acrylic copolymer decreases, or the gel fraction of the pressure-sensitive adhesive layer decreases.
  • the more preferable minimum with respect to 100 weight part of said mixed monomers is 0.03 weight part, and a more preferable upper limit is 1 weight part.
  • the said transparent synthetic resin film is not specifically limited, For example, a polyethylene terephthalate film etc. are mentioned.
  • the lamp used for the light irradiation is not particularly limited, and examples thereof include a lamp having a light emission distribution at a wavelength of 400 nm or less.
  • Examples of the lamp having a light emission distribution at a wavelength of 400 nm or less include a low-pressure mercury lamp, a medium-pressure mercury lamp, a high-pressure mercury lamp, an ultrahigh-pressure mercury lamp, a chemical lamp, a black light lamp, a microwave-excited mercury lamp, and a metal halide lamp. It is done. Among these, the light in the active wavelength region of the photopolymerization initiator is efficiently emitted, and there is little light absorption of components other than the photopolymerization initiator contained in the monomer layer, so that light can enter the monomer layer.
  • a chemical lamp is preferred because it can sufficiently reach and effectively polymerize the mixed monomer.
  • the light irradiation intensity in the above light irradiation is not particularly limited, and is a factor that affects the degree of polymerization of the resulting acrylic copolymer, so that it matches the degree of polymerization of the target acrylic copolymer or the performance of the pressure-sensitive adhesive layer. And adjusted as appropriate.
  • the light irradiation intensity in the wavelength region effective for photolysis of the acetophenone photopolymerization initiator is 0.1 to 100 mW / cm 2 . It is preferable.
  • the wavelength range effective for the photodecomposition of the acetophenone-based photopolymerization initiator is usually about 365 nm to 420 nm, although it varies depending on the photopolymerization initiator.
  • the application of the pressure-sensitive adhesive tape for optical members of the present invention is not particularly limited, and can be applied to various optical members.
  • the pressure-sensitive adhesive tape for optical members of the present invention is used in the manufacture of image display devices such as mobile phones and portable information terminals. Used to attach a protective plate for protecting the surface and a display panel, or when manufacturing an input device such as a mobile phone or a portable information terminal, a polycarbonate plate or an acrylic plate of a touch panel, and a display panel It is preferable to use for bonding together.
  • the whitening which arises under high temperature and high humidity can be suppressed, and the adhesive composition for optical members which can implement
  • the adhesive tape for optical members manufactured using this adhesive composition for optical members can be provided.
  • Example 1-1 Production of acrylic copolymer In a reactor equipped with a thermometer, a stirrer, and a cooling tube, 44.5 parts by weight of 2-ethylhexyl acrylate, 30 parts by weight of isobornyl acrylate, and 0.5 parts by weight of acrylic acid Then, 25 parts by weight of 2-hydroxyethyl acrylate, and 100 parts by weight of ethyl acetate with respect to 100 parts by weight of these monomers were replaced with nitrogen, and then the reactor was heated to start refluxing.
  • Examples 1-2 to 1-5 Comparative Examples 1-1 to 1-3
  • the mold release was carried out in the same manner as in Example 1-1, except that the acrylic copolymer having the proportion (% by weight) shown in Table 1 was obtained by changing the monomer composition of the acrylic copolymer.
  • a double-sided pressure-sensitive adhesive tape for an optical member having a polyethylene terephthalate film attached on both sides was obtained.
  • Example 2-1 Production of acrylic copolymer In a reactor equipped with a thermometer, a stirrer, and a cooling tube, 59.5 parts by weight of 2-ethylhexyl acrylate, 15 parts by weight of isobornyl acrylate, and 0.5 parts by weight of acrylic acid And 25 parts by weight of N-vinylpyrrolidone and 100 parts by weight of ethyl acetate with respect to 100 parts by weight of these monomers were substituted by nitrogen bubbling, and then the reactor was brought to 70 ° C. under a nitrogen flow.
  • 0.2 parts by weight of t-hexylperoxypivalate as a polymerization initiator is diluted with 5 parts by weight of ethyl acetate with respect to 100 parts by weight of the monomer, and the resulting polymerization initiator solution is diluted with the above reactor.
  • the solution was added dropwise over 2 hours.
  • the temperature was controlled by heating and cooling so that the reaction temperature was maintained at 70 ° C.
  • the reaction was carried out at 70 ° C. for 8 hours from the start of the addition of the polymerization initiator, and then the reaction was terminated by cooling to obtain an acrylic copolymer solution having a solid content of 50%.
  • Examples 2-2 to 2-8 Comparative Examples 2-1 to 2-3
  • the acrylic copolymer having the proportion (% by weight) of the structural units and the weight average molecular weight shown in Table 2 was obtained.
  • a double-sided pressure-sensitive adhesive tape for an optical member having a release polyethylene terephthalate film attached on both sides was obtained.
  • the weight average molecular weight by polystyrene conversion was measured by GPC method using "2690 Separations Model" made from Waters as a column.
  • the obtained weight average molecular weight is shown in Table 3.
  • Examples 3-2 to 3-9 Comparative Examples 3-1 to 3-5
  • the acrylic copolymer having the weight average molecular weight shown in Table 3 or 4 was obtained by changing the monomer composition of the acrylic copolymer as shown in Table 3 or 4.
  • a double-sided pressure-sensitive adhesive tape for optical members having a release polyethylene terephthalate film attached on both sides was obtained.
  • a monomer composition from which dissolved oxygen was removed was produced by uniformly purging with a product name “Irgacure 651” manufactured by the company, and then purging with nitrogen.
  • the obtained monomer composition was sandwiched between two silicon release polyethylene terephthalate films having a thickness of 38 ⁇ m through two spacers having a thickness of 100 ⁇ m so that the thickness would be 100 ⁇ m so that each release treatment surface was in contact with the monomer composition. It is.
  • a double-sided pressure-sensitive adhesive tape for an optical member having a release polyethylene terephthalate film attached to both sides is obtained by polymerizing the monomer by irradiating the monomer composition with 2 mW ultraviolet rays for 5 minutes using a fluorescent lamp having a dominant wavelength of 365 nm. Obtained.
  • Examples 3-11 to 3-18, Comparative Examples 3-6 to 3-10) A release polyethylene terephthalate film was applied to both sides in the same manner as in Example 3-10, except that the acrylic copolymer was obtained by changing the monomer composition of the acrylic copolymer as shown in Table 5 or 6. The obtained double-sided pressure-sensitive adhesive tape for optical members was obtained.
  • the weight average molecular weight by polystyrene conversion was measured by GPC method using "2690 Separations Model" made from Waters as a column.
  • the obtained weight average molecular weight is shown in Table 7.
  • Examples 4-2 to 4-9 Comparative Example 4-1
  • the acrylic copolymer having the weight average molecular weight shown in Table 7 was obtained by changing the monomer composition of the acrylic copolymer as shown in Table 7.
  • a double-sided pressure-sensitive adhesive tape for optical members having a polyethylene terephthalate film attached on both sides was obtained.
  • a monomer composition from which dissolved oxygen was removed was produced by uniformly purging with a product name “Irgacure 651” manufactured by the company, and then purging with nitrogen.
  • the obtained monomer composition was sandwiched between two silicon release polyethylene terephthalate films having a thickness of 38 ⁇ m through two spacers having a thickness of 100 ⁇ m so that the thickness would be 100 ⁇ m so that each release treatment surface was in contact with the monomer composition. It is.
  • a double-sided pressure-sensitive adhesive tape for an optical member having a release polyethylene terephthalate film attached to both sides is obtained by polymerizing the monomer by irradiating the monomer composition with 2 mW ultraviolet rays for 5 minutes using a fluorescent lamp having a dominant wavelength of 365 nm. Obtained.
  • Example 4-11 to 4-18 Comparative Example 4-2
  • a release polyethylene terephthalate film was attached to both sides in the same manner as in Example 4-10, except that the acrylic copolymer was obtained by changing the monomer composition of the acrylic copolymer as shown in Table 8.
  • a double-sided pressure-sensitive adhesive tape for optical members was obtained.
  • ⁇ haze value ⁇ haze value of test piece after standing for 24 hours (%) ⁇ ⁇ ⁇ haze value immediately after preparation of test piece (%) ⁇ (2)
  • the obtained double-sided adhesive tape for optical members was cut so as to have a planar shape of 25 mm ⁇ 100 mm.
  • One release polyethylene terephthalate film of the cut double-sided pressure-sensitive adhesive tape for optical members was peeled, and the exposed surface of the double-sided pressure-sensitive adhesive tape for optical members was bonded onto the polyethylene terephthalate film.
  • the other release polyethylene terephthalate film of the double-sided pressure-sensitive adhesive tape for optical members is peeled off, and the exposed surface of the double-sided pressure-sensitive adhesive tape for optical members is bonded onto the polycarbonate plate (PC plate), whereby a polycarbonate plate (PC plate) )
  • PC plate polycarbonate plate
  • a 2.0 kg rubber roller is placed on the polyethylene terephthalate film of the obtained laminated sample, and the rubber roller is reciprocated once at a speed of 300 mm / min. And left at 23 ° C. for 20 minutes to prepare a test sample.
  • the obtained test sample was subjected to a tensile test in the 180 ° direction at a peeling speed of 300 mm / min according to JIS Z0237, and the initial adhesive strength (N / 25 mm) was measured.
  • the obtained test sample was allowed to stand at 23 ° C. for 24 hours, and then subjected to a tensile test in the 180 ° direction at a peeling rate of 300 mm / min according to JIS Z0237, and the adhesive strength (N / 25 mm) after 24 hours was measured. It was measured.
  • the obtained double-sided pressure-sensitive adhesive tape for optical members was cut so as to have a flat shape of 45 mm ⁇ 60 mm.
  • One release polyethylene terephthalate film of the cut double-sided pressure-sensitive adhesive tape for optical members was peeled, and the exposed surface of the double-sided pressure-sensitive adhesive tape for optical members was bonded onto a polyethylene terephthalate film having a thickness of 0.5 mm.
  • the other release polyethylene terephthalate film of the double-sided pressure-sensitive adhesive tape for optical members is peeled, and the exposed surface of the double-sided pressure-sensitive adhesive tape for optical members is placed on a polycarbonate plate (PC plate) having a planar shape with a thickness of 2.0 mm.
  • PC plate polycarbonate plate
  • a laminated sample in which a double-sided pressure-sensitive adhesive tape for optical members and a polyethylene terephthalate film were laminated in this order on a polycarbonate plate (PC plate) was obtained. Thereafter, the obtained laminated sample was allowed to stand for 24 hours under the condition of a temperature of 85 ° C. or a temperature of 60 ° C. and a relative humidity (RH) of 90% to obtain a test sample.
  • the bubble generation state in the adhesion interface of the obtained test sample was visually observed. “ ⁇ ” indicates that no bubbles having a size of 0.01 mm or more were observed, and “ ⁇ ” indicates that 1 to 5 bubbles having a size of 0.01 mm or more were observed per test sample.
  • the bubble generation state was evaluated by setting “x” when 6 or more bubbles having a size of 0.01 mm or more were observed per test sample.
  • the obtained double-sided pressure-sensitive adhesive tape for optical members was cut so as to have a planar shape of length 40 mm ⁇ width 60 mm. Further, two corners adjacent in the width direction were cut into a planar shape having a length of 10 mm from the corner and a width of 10 mm from the corner to obtain a convex tape sheet.
  • One release polyethylene terephthalate film of the convex tape sheet was peeled off, and the exposed surface of the convex tape sheet was bonded onto polyethylene terephthalate.
  • the other release polyethylene terephthalate film of the convex tape sheet is peeled off, and the exposed surface of the convex tape sheet is pasted on the ITO film surface of the ITO film having a planar shape of length 40 mm ⁇ width 60 mm.
  • the conductive film laminated body by which the double-sided adhesive tape for optical members and the polyethylene terephthalate were laminated
  • Resistance value change rate (%) (R 1 ⁇ R 0 ) / R 0 ⁇ 100 (3)
  • R 0 represents an initial resistance value
  • R 1 represents a resistance value after being left for 100 hours under high temperature and high humidity.
  • the resistance value change rate is preferably 20% or less, and more preferably 15% or less. If the resistance value change rate exceeds 20%, an erroneous electric signal may be input to the recognition part of the touch panel having the ITO film, which may cause a bad response.
  • the whitening which arises under high temperature and high humidity can be suppressed, and the adhesive composition for optical members which can implement
  • the adhesive tape for optical members manufactured using this adhesive composition for optical members can be provided.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Adhesive Tapes (AREA)

Abstract

L'invention porte sur une composition d'adhésif autocollant pour des éléments optiques qui est protégée du blanchissement dans des conditions de haute température et d'humidité élevée et qui permet de garantir une fiabilité élevée. L'invention porte également sur un ruban adhésif autocollant pour des éléments optiques, qui est produit à l'aide de la composition d'adhésif autocollant. La composition d'adhésif autocollant pour des éléments optiques comprend un copolymère acrylique obtenu par polymérisation d'un monomère mélangé qui contient 1 à 25 % en poids d'acrylate de 2-hydroxyéthyle, 1 à 25 % en poids de N-vinylpyrrolidone, 0,5 à 30 % en poids d'un monomère ayant une structure représentée par la formule générale (1-1), ou 0,1 à 30 % en poids d'un monomère ayant une structure représentée par la formule générale (1-2). Dans la formule générale (1-1), R1 représente hydrogène ou méthyle ; R2 représente hydrogène ou alkyle ayant moins de 3 atomes de carbone ; et n représente un entier de 8 à 45. Dans la formule générale (1-2), R3 représente hydrogène ou méthyle ; R4 représente alkyle ayant 3 à 30 atomes de carbone ; et m représente un entier de 8 à 45.
PCT/JP2011/056467 2010-03-18 2011-03-17 Composition d'adhésif autocollant pour éléments optiques et ruban adhésif autocollant pour éléments optiques WO2011115224A1 (fr)

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KR1020127026981A KR101938894B1 (ko) 2010-03-18 2011-03-17 광학 부재용 점착제 조성물 및 광학 부재용 점착 테이프
JP2011513787A JP5727371B2 (ja) 2010-03-18 2011-03-17 光学部材用粘着剤組成物及び光学部材用粘着テープ

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WO2013047210A1 (fr) * 2011-09-30 2013-04-04 日東電工株式会社 Adhésif, couche adhésive et feuille adhésive
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WO2013122144A1 (fr) * 2012-02-17 2013-08-22 株式会社スリーボンド Composition adhésive de type feuille photodurcissable pour utilisation optique
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JP2015508431A (ja) * 2011-12-21 2015-03-19 エルジー・ケム・リミテッド 粘着剤組成物
WO2016027787A1 (fr) * 2014-08-18 2016-02-25 日本合成化学工業株式会社 Composition d'adhésif, adhésif constitué par réticulation de celle-ci, adhésif pour film masque, adhésif pour film adhésif résistant à la chaleur, et film adhésif résistant à la chaleur pour masque ainsi que procédé de mise en œuvre de celui-ci
JP2016094616A (ja) * 2013-12-27 2016-05-26 積水化学工業株式会社 光学用粘着剤、光学用粘着テープ及び積層体
JP2016156021A (ja) * 2016-03-17 2016-09-01 藤森工業株式会社 電気絶縁用粘着剤層、電気絶縁用粘着フィルム、及びそれが貼合された光学部材
WO2016148208A1 (fr) * 2015-03-17 2016-09-22 日立化成株式会社 Feuille adhésive pour dispositif d'affichage d'image, corps stratifié adhésif pour dispositif d'affichage d'image, et dispositif d'affichage d'image
JP2016535319A (ja) * 2013-09-30 2016-11-10 エルジー・ケム・リミテッド 偏光板
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JP2018062674A (ja) * 2018-01-24 2018-04-19 藤森工業株式会社 電気絶縁用粘着剤層、電気絶縁用粘着フィルム、及びそれが貼合された光学部材
JP2019143153A (ja) * 2019-04-10 2019-08-29 藤森工業株式会社 電気絶縁用粘着剤層、電気絶縁用粘着フィルム、及びそれが貼合された光学部材
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