WO2015079728A1 - 光硬化性光学接着剤組成物、その硬化物、及び液晶表示装置 - Google Patents
光硬化性光学接着剤組成物、その硬化物、及び液晶表示装置 Download PDFInfo
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- WO2015079728A1 WO2015079728A1 PCT/JP2014/065981 JP2014065981W WO2015079728A1 WO 2015079728 A1 WO2015079728 A1 WO 2015079728A1 JP 2014065981 W JP2014065981 W JP 2014065981W WO 2015079728 A1 WO2015079728 A1 WO 2015079728A1
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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
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
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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
- C08F2/00—Processes of polymerisation
- C08F2/46—Polymerisation initiated by wave energy or particle radiation
- C08F2/48—Polymerisation initiated by wave energy or particle radiation by ultraviolet or visible light
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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
- C08F290/00—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups
- C08F290/02—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups on to polymers modified by introduction of unsaturated end groups
- C08F290/06—Polymers provided for in subclass C08G
- C08F290/067—Polyurethanes; Polyureas
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4825—Polyethers containing two hydroxy groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/75—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic
- C08G18/751—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring
- C08G18/752—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group
- C08G18/753—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group
- C08G18/755—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/75—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic
- C08G18/758—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing two or more cycloaliphatic rings
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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
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
- C09J175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
-
- 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
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
- C09J175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
- C09J175/16—Polyurethanes having carbon-to-carbon unsaturated bonds having terminal carbon-to-carbon unsaturated bonds
-
- 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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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2202/00—Materials and properties
- G02F2202/28—Adhesive materials or arrangements
Definitions
- the present invention relates to a photocurable optical adhesive used for bonding optical lens members, bonding a liquid crystal panel and a cover glass in a liquid crystal display device, bonding a liquid crystal panel and a touch panel substrate, or bonding a touch panel substrate and a cover glass.
- the present invention relates to a composition and a liquid crystal display device using the adhesive composition.
- the liquid crystal display device has a structure in which an LCD module composed of a liquid crystal cell, a polarizing plate, an optical film and various protective films and a cover glass are laminated, and in the touch panel type, the LCD module, the transparent electrode substrate, and the cover glass. It has a laminated structure.
- a method of laminating the above parts with a so-called OCA transparent resin adhesive tape is generally used. There was a difficulty that it was difficult to match the unevenness (step following).
- liquid OCA which is superior to OCA in terms of level difference tracking, has been growing in the market scale. Since such L-OCA is used for bonding a cover glass or an ITO film, the cured product is required to have a flexibility capable of absorbing an impact from the outside.
- aliphatic urethane acrylate, phenoxyethyl A monofunctional monomer selected from the group consisting of acrylate and trimethylolpropane formal acrylate, a photopolymerization initiator, a plasticizer selected from the group consisting of dibutoxyethoxyethyl adipate and dibutoxyethoxyethyl formal, and a chain transfer agent A LOCA material is known (for example, see Patent Document 1).
- such a LOCA material has a flexible structure in the polymer structure and can be blended with a plasticizer to develop fluidity and elongation in the cured product, but the refractive index of the cured product is located on the outermost layer. It was lower than the glass cover, and as a result, the light transmission was reduced.
- the problem to be solved by the present invention is a photocurable optical adhesive composition that exhibits excellent flexibility in a cured product and exhibits a refractive index close to that of glass, its cured product, and is strong in impact and brightness.
- the object is to provide an excellent liquid crystal display device.
- the present inventors have used a urethane resin having a flexible structure as a resin used in a photocurable optical adhesive composition, and has a specific chemical structure as a plasticizer. When using this, it was found that both flexibility and high refractive index in the cured product can be achieved, and the present invention has been completed.
- the present invention relates to urethane acrylate (A) having a flexible structure, other radical polymerizable monomer (B), the following structural formula (1)
- a photocurable optical adhesive composition characterized by comprising a compound (C) represented by formula (I) and a photopolymerization initiator (D) as essential components.
- the present invention further provides a cured product obtained by curing the photocurable optical adhesive composition.
- the photo-curable optical adhesive composition is further applied or filled on an LCD module or a transparent electrode substrate in a liquid crystal display device, and further, a cover glass or a transparent electrode substrate is bonded together, and then irradiated with light.
- a liquid crystal display device characterized by being cured is provided.
- a photocurable optical adhesive composition that exhibits excellent flexibility in a cured product and exhibits a refractive index close to that of glass, a cured product thereof, and a liquid crystal display device that is strong in impact and excellent in luminance. Can be provided.
- FIG. 1 is a cross-sectional view of a liquid crystal display device having an out-cell type touch panel according to the present invention.
- FIG. 2 is a cross-sectional view of a liquid crystal display device having the resistive film type touch panel of the present invention.
- FIG. 3 is a cross-sectional view of a liquid crystal display device having an in-cell / on-cell touch panel according to the present invention.
- the flexible urethane acrylate (A) used in the present invention is a urethane (meth) acrylate resin having a flexible structure in the resin structure.
- the flexible structure include an alkylene structure, a polyoxyalkylene structure, Examples thereof include an aliphatic polyester structure and an aliphatic polycarbonate structure.
- the alkylene structure has a linear, branched or cyclic structure such as ethylene, propylene, isopropylene, butylene, isobutylene, cyclohexane-1,4-diyl, cyclohexane-1,4-dimethyl, etc.
- Examples thereof include aliphatic hydrocarbon groups having 2 to 8 carbon atoms.
- examples of the polyoxyalkylene structure include those having 2 to 4 carbon atoms in the alkylene portion such as polyoxyethylene, polyoxypropylene, polyoxy-1,2-propylene, polyoxybutylene and the like. Further, the number of repeating units of the polyoxyalkylene structure is preferably in the range of 20 to 200 from the viewpoint of excellent flexibility in the cured product of the finally obtained adhesive.
- examples of the aliphatic polyester structure include a polyester structure having a linear or branched alkylene group having 2 to 12 carbon atoms as an aliphatic hydrocarbon moiety.
- examples of the aliphatic polycarbonate structure include an aliphatic carbonate structure having a linear or branched alkylene group having 2 to 8 carbon atoms as an aliphatic hydrocarbon moiety.
- an alkylene structure or a polyoxyalkylene structure is preferable from the viewpoint of excellent flexibility and elongation when a cured product is used.
- the urethane acrylate (A) having the flexible structure described above is obtained by reacting the diisocyanate compound (a), the aliphatic diol (b), and the hydroxyl group-containing (meth) acrylate compound (c) as essential raw material components.
- Those having a structure obtained, or those having a structure in which a cyclic ester compound (b ′) is reacted with a hydroxyl group-containing (meth) acrylate compound (c) and then reacted with a diisocyanate compound (a), etc. Can be mentioned.
- diisocyanate compound (a) used here examples include 1,3-phenylene diisocyanate, 1,4-phenylene diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 2,2′-diphenylmethane diisocyanate, Aromatic diisocyanates such as 2,4'-diphenylmethane diisocyanate, 4,4'-diphenylmethane diisocyanate; isophorone diisocyanate, 2,2'-dicyclohexylmethane diisocyanate, 2,4'-dicyclohexylmethane diisocyanate, 4,4'-dicyclohexylmethane Aliphatic diisocyanates such as diisocyanates are mentioned. In the present invention, among these, aliphatic diisocyanate is particularly preferable from the viewpoint of transparency.
- the aliphatic diol (b) is a raw material for introducing a flexible structure into the urethane acrylate (A), and examples thereof include alkylene glycol, polyalkylene glycol, and aliphatic polycarbonate diol.
- examples of the alkylene glycol include ethylene glycol, 1,3-propylene glycol, 1,2-propylene glycol, tetramethylene glycol, 1,4-cyclohexynesandiol, 1,4-cyclohexanedimethanol and the like.
- Polyalkylene glycols include polyethylene glycol, poly-1,3-propylene glycol, poly-1,2-propylene glycol, polybutylene glycol and the like.
- aliphatic polycarbonate diol for example, any one obtained by reacting an alkylene carbonate and an alkylene diol can be used.
- the alkylene carbonate used here specifically includes ethylene carbonate, trimethylene carbonate, 1,2-propylene carbonate, 1,2-butylene carbonate, 1,3-butylene carbonate, 1,2-pentylene carbonate, and the like. Examples include alkylene carbonate.
- alkylene diol examples include ethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,7-heptanediol, 1,8 -Octanediol, 2-methyl-1,8-octanediol, neopentyl glycol, 2-ethyl-1,6-hexanediol, 2-methyl-1,3-propanediol, 3-methyl-1,5-pentane
- Examples thereof include branched diols such as diol, 2,4-dimethyl-1,5-pentanediol, and 2,4-diethyl-1,5-pentanediol.
- examples of the cyclic ester compound (b ′) include ⁇ -butyrolactone, ⁇ -valerolactone, ⁇ -valerolactone, ⁇ -caprolactone, ⁇ -methylcaprolactone, ⁇ -ethylcaprolactone, ⁇ -propylcaprolactone, Examples include 3-pentene-4-olide, 12-dodecanolide, and ⁇ -dodecanolactone.
- alkylene glycol or polyalkylene glycol is preferable from the viewpoint of excellent flexibility and elongation when cured.
- the number of repeating units of the oxyalkylene structure of such polyalkylene glycol is in the range of 50 to 200 because the flexibility of the cured product is better.
- polyethylene glycol or polypropylene glycol is particularly preferable from the viewpoint of the flexibility of the cured product.
- the hydroxyl group-containing (meth) acrylate compound (c) specifically includes 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, neopentyl glycol.
- Mono (meth) acrylate 4-hydroxycyclohexyl (meth) acrylate, 1,6-hexanediol mono (meth) acrylate, glycerin di (meth) acrylate, trimethylolpropane di (meth) acrylate, pentaerythritol tri (meth) acrylate, Aliphatic (meth) acrylate compounds such as dipentaerythritol penta (meth) acrylate;
- cyclic ester compound for example, ⁇ -butyrolactone, ⁇ -valerolactone, ⁇ -valerolactone, ⁇ -caprolactone, ⁇ -methylcaprolactone, ⁇ -ethylcaprolactone, ⁇ -propylcaprolactone, 3-pentene-4- Orido, 12-dodecanolide, ⁇ -dodecanolactone and the like.
- a compound obtained by adding a cyclic ester compound to a hydroxyl group-containing acryloyl group-containing compound it is appropriate that 2 to 4 mol of the cyclic ester compound is added to 1 mol of the hydroxyl group-containing acryloyl group-containing compound. It is preferable from the viewpoint of obtaining flexibility.
- 2-hydroxyethyl (meth) acrylate or an ⁇ -caprolactone adduct thereof is preferable from the viewpoint of excellent flexibility of the cured product particularly when used as an adhesive.
- 2-hydroxyethyl (meta) ) It is preferable that 2 or 3 mol of ⁇ -caprolactone adduct is added to 1 mol of acrylate.
- the method of reacting the diisocyanate compound (a), alkylene glycol or polyalkylene glycol (b), and hydroxyl group-containing (meth) acrylate compound (c) described in detail above can be obtained by reacting the diisocyanate compound (a) with alkylene glycol or polyalkylene glycol ( b), the molar ratio [(OH) / (NCO)] of the hydroxyl group of the alkylene glycol or polyalkylene glycol (b) to the isocyanate group of the diisocyanate compound (a) is 1 / 0.5 to 1 /2.0, in a temperature range of 20 to 120 ° C., if necessary, using a known and conventional urethanization catalyst to obtain an isocyanate group-containing intermediate as a reaction product, Next, a hydroxyl group-containing (meth) acrylate compound in the intermediate structure and the molecular structure c), the molar ratio [(OH) / (NCO)] of the hydroxyl group of
- urethane (meth) acrylate (A) having the alkylene structure or polyoxyalkylene structure described above include, for example, a diisocyanate compound (a), an alkylene glycol or a polyalkylene glycol (b), and a hydroxyl group-containing (meta )
- the urethane (meth) acrylate (A) having the alkylene structure or polyoxyalkylene structure thus obtained is a composition having a lower viscosity, and the polymerizable diluent is contained in an amount of 30 to 50% by mass.
- the viscosity at 25 ° C. is in the range of 10 to 500 Pa ⁇ s.
- the polymerizable diluent (B) used in the photocurable resin composition of the present invention includes, for example, phenylbenzyl (meth) acrylate (PBA), phenylthioethyl (meth) acrylate (PTEA), o-phenylphenoxy High refractive index monofunctional (meth) acrylate compounds such as ethyl (meth) acrylate (OPPEA) and naphthylthioethyl (meth) acrylate (NTEA); other n-butyl (meth) acrylate, isobutyl (meth) acrylate, tert-butyl (Meth) acrylate, n-pentyl (meth) acrylate, n-hexyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, 2-ethylhexyl (meth)
- monofunctional (meth) acryloyl group-containing compounds such as monofunctional (meth) acrylates and monofunctional acrylamides are preferred from the viewpoint of the flexibility of the cured product, and isobornyl (meth) acrylate is heat-resistant yellowing.
- isobornyl (meth) acrylate is heat-resistant yellowing.
- morpholine (meth) acrylate and dimethylacrylamide are preferred from the viewpoint of excellent heat and moisture resistance.
- the blending amount of the polymerizable diluent (B) is 10 to 80% by mass with respect to the synthetic mass with the urethane (meth) acrylate resin (A), so that the effect of improving the refractive index and reducing the viscosity can be obtained. It is preferable from the point which becomes remarkable. Further, it is particularly preferably 20 to 60% by mass.
- the compound (C) used in the present invention has the following structural formula (1).
- R 1 is a linear or branched aliphatic hydrocarbon group having 2 to 9 carbon atoms
- R 2 is a hydrogen atom, an alkyl group having 1 to 3 carbon atoms
- R 3 is a hydrogen atom, 1 carbon atom. Represents an alkyl group of ⁇ 3, and n is an integer of 0 to 5.
- It functions as a plasticizer in the adhesive composition of the present invention.
- the plasticizer which has such a chemical structure is used, while being excellent in a softness
- R 1 is a linear or branched aliphatic hydrocarbon group having 2 to 9 carbon atoms, specifically, an ethylene group, an n-propylene group, an i-propylene group, And a butylene group.
- N is a repeating unit and is an integer of 0 to 5, but is preferably 0 or 1 from the viewpoint of excellent balance between flexibility and refractive index.
- R 2 is specifically a hydrogen atom, a methyl group, or an n-propyl group, and particularly preferably a hydrogen atom from the viewpoint of refractive index.
- R 3 is specifically a hydrogen atom, a methyl group, or an n-propyl group, but is particularly preferably a hydrogen atom from the viewpoint of refractive index.
- Such a compound (C) is specifically, propylene glycol dibenzoate, diethylene glycol dibenzoate, dipropylene glycol dibenzoate, ethylene glycol dibenzoate, 1,3-propanediol dibenzoate, 1,5-pentaneol dibenzoate.
- Examples include 1,6-hexanediol dibenzoate, 1,9-nonanediol dibenzoate, neopentyl glycol dibenzoate, butylethylpropanediol dibenzoate, and trilolpropane dibenzoate.
- propylene glycol dibenzoate, diethylene glycol dibenzoate, dipropylene glycol dibenzoate, and ethylene glycol dibenzoate are particularly preferable from the viewpoint of refractive index.
- the compounding ratio of the compound (C) is preferably 1 to 50% by mass in the composition.
- Examples of the photopolymerization initiator (D) used in the present invention include 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, and 1- [4- (2-hydroxyethoxy).
- photopolymerization initiators (D) are used in an amount of 0.1 to 25 masses with respect to 100 mass parts in total of the photopolymerizable substances having a (meth) acryloyl group in the composition in order to develop sufficient curability. It is preferable to blend in the range of 1 part by weight, more preferably in the range of 1 to 5 parts by weight.
- a benzophenone photopolymerization initiator having an aromatic nucleus as a substituent such as 4-phenylbenzophenone and 4- (4-methylphenylthio) benzophenone is used.
- a photopolymerization initiator having photosensitivity in a long wavelength region of 380 nm to 600 nm such as 2,4,6-trimethylbenzoyldiphenylphosphine oxide, 1-hydroxycyclohexyl phenyl ketone, 2,2-dimethoxy-
- a material having photosensitivity in a short wavelength region of 200 nm to 380 nm, such as 1,2-diphenylethane-1-one is preferable from the viewpoint of excellent transparency.
- a benzophenone photopolymerization initiator having an aromatic nucleus as a substituent such as 4-phenylbenzophenone and 4- (4-methylphenylthio) benzophenone is used.
- those having photosensitivity in a short wavelength region of 200 nm to 380 nm such as 1-hydroxycyclohexyl phenyl ketone and 2,2-dimethoxy-1,2-diphenylethane-1-one, This is preferable from the viewpoint of excellent curability.
- the photopolymerization initiator having photosensitivity in the long wavelength region and the photopolymerization initiator having photosensitivity in the short wavelength region are used in combination because the curability is further improved. .
- the photocurable optical adhesive composition of the present invention may contain various photosensitizers in addition to the photopolymerization initiator (D).
- the photosensitizer include amines, ureas, sulfur-containing compounds, phosphorus-containing compounds, chlorine-containing compounds, nitriles or other nitrogen-containing compounds, and these can be used alone or in two types. You may use the above together.
- the amount of these photosensitizers added is preferably in the range of 0.01 to 25 parts by mass with respect to 100 parts by mass of the urethane (meth) acrylate resin (A).
- the photo-curable optical adhesive composition described in detail above is suitably used as an adhesive used for laminating optical lens members or a so-called LOCA for bonding various substrates in a liquid crystal display device.
- LOCA especially from the point which is excellent in the softness
- the liquid crystal display device is composed of a liquid crystal panel composed of a liquid crystal cell, a polarizing plate, and various optical films, a touch panel substrate if necessary, a cover glass, etc.
- the photocurable optical adhesive composition of the present invention is It can be used as an adhesive between these various substrates. Specifically, it can be suitably used for bonding an LCD module and a cover glass in a liquid crystal display device, bonding a liquid crystal panel and a touch panel substrate, bonding a touch panel substrate and a cover glass, or the like.
- the liquid crystal display device When used in a liquid crystal display device having a touch panel structure, the liquid crystal display device may be any of an out-cell type, a cover glass integrated type, an in-cell type, and an on-cell type.
- the out-cell type a liquid crystal panel and a touch panel substrate It can be used for adhesion between the touch panel substrate and the cover glass.
- the cover glass integrated type it is used for adhesion between the substrate in which the electrode of the capacitive touch sensor is formed on the cover glass and the liquid crystal panel. be able to.
- the in-cell type and on-cell type can be used for adhesion between the liquid crystal panel and the cover glass.
- decorative printing may be performed on the back surface of the cover glass.
- a step may be generated between the cover glass and the decorative printing part. Since the photocurable optical adhesive composition of the present invention is liquid before curing, such a step is provided. Excellent trackability is expressed.
- the photocurable resin composition of the present invention can be cured by irradiation with ultraviolet rays or visible light.
- the amount of ultraviolet light exposure is preferably in the range of 0.1 to 3000 mJ / cm 2 .
- the method for producing the liquid crystal display device of the present invention from the photocurable optical adhesive composition described in detail above is applied or filled on a liquid crystal panel or a touch panel plate, and further bonded to a cover glass or a touch panel substrate.
- the method of irradiating and hardening is mentioned.
- Examples 1 to 7 and Comparative Examples 1 to 3 Each component was blended according to the composition ratio described in Table 1 to prepare a photocurable resin composition. In addition, the composition ratio in Table 1 is based on mass. Using this, the refractive index, color tone, and cured product elongation were evaluated by the following evaluation methods.
- Refractive index A test piece obtained by curing the photocurable resin composition obtained in each Example and Comparative Example into a sheet was measured with an Abbe refractometer (“NAR-3T” manufactured by Atago Co., Ltd., 25 ° C.).
- [Color tone] The photocurable resin composition prepared in each Example and Comparative Example was sandwiched between glass plates to prepare a cured sample having a thickness of 200 ⁇ m.
- each compounding component in Table 1 is as follows.
- Urethane acrylate A Polyether urethane acrylate (PPG10000 / IPDI / HEA)
- Urethane acrylate B Polyether urethane acrylate (PPG10000 / IPDI / HPA)
- Urethane acrylate C Polyether urethane acrylate (PPG10000 / H 12 MDI / HEA)
- Urethane acrylate D Polyether urethane acrylate (PPG10000 / H 12 MDI / HPA)
- Plasticizer A propylene glycol dibenzoate
- Plasticizer B diethylene glycol dibenzoate
- Plasticizer C
- FIG. 1 is an example of a liquid crystal display device having an out-cell type touch panel, between a liquid crystal panel 5 and a touch panel substrate 4 and between the touch panel substrate 4 and a glass substrate 1 on which decorative printing 2 has been applied.
- FIG. 2 is an example of a liquid crystal display device having a resistive film type touch panel, and the photo-curing property of the present invention between a film or glass substrate 8 provided with ITO 7 and a glass substrate 1 on which decorative printing 2 is applied. This is an example in which an optical adhesive composition is used.
- FIG. 1 is an example of a liquid crystal display device having an out-cell type touch panel, between a liquid crystal panel 5 and a touch panel substrate 4 and between the touch panel substrate 4 and a glass substrate 1 on which decorative printing 2 has been applied.
- FIG. 2 is an example of a liquid crystal display device having a resistive film type touch panel, and the photo-curing property of the present invention between a film or glass substrate 8 provided with ITO 7 and a glass substrate 1 on which decorative printing 2
- FIG. 3 is an example of a liquid crystal display device having an in-cell / on-cell touch panel, and the photocurable optical adhesive composition of the present invention between the liquid crystal panel 5 and the glass substrate 1 on which decorative printing 2 has been applied. This is an example where a thing is used.
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Abstract
Description
で表される化合物(C)、及び光重合開始剤(D)を必須成分とすることを特徴とする光硬化性光学接着剤組成物を提供するものである。
(R1は、炭素原子数2~9の直鎖又は分岐状の脂肪族炭化水素基、R2は水素原子、炭素原子数1~3のアルキル基、R3は水素原子、炭素原子数1~3のアルキル基を表し、nは0~5の整数である。)
で表されるものであり、本発明の接着剤組成物中、可塑剤として機能するものである。本発明では、斯かる化学構造を有する可塑剤を用いることから、硬化物において柔軟性に優れると共に、ガラスに近い屈折率を発現させることができる。
表1に記載した組成比率に従い各成分を配合し光硬化型樹脂組成物を調整した。なお、表1中の組成比率は質量基準である。
これを用い、下記の評価方法にて屈折率、色調、及び硬化物伸び率の評価を行った。
[屈折率]
各実施例及び比較例で得られた光硬化型樹脂組成物をシート状に硬化させた試験片をアッベ屈折率計(アタゴ社製「NAR-3T」、25℃)で測定した。
[色調]
各実施例及び比較例で作成した光硬化型樹脂組成物をガラス板の間に挟み、厚さ200μmの硬化サンプルを作成した。作成サンプルのb*値を測色色差計により測定した。結果を表1に示した。
[硬化物伸び率]
各実施例及び比較例で作成した光硬化型樹脂組成物を、厚さ0.2mmのシート状に硬化させた。硬化物に対し、引張伸び試験を行い破断したときの伸びを測定した。結果を表1に示した。
ウレタンアクリレートA:ポリエーテル系ウレタンアクレート(PPG10000/IPDI/HEA)
ウレタンアクリレートB:ポリエーテル系ウレタンアクリレート(PPG10000/IPDI/HPA)
ウレタンアクリレートC:ポリエーテル系ウレタンアクリレート(PPG10000/H12MDI/HEA)
ウレタンアクリレートD:ポリエーテル系ウレタンアクリレート(PPG10000/H12MDI/HPA)
単官能アクリレートモノマーA:イソボルニルアクリレート、
単官能アクリレートモノマーB:ジメチルアクリルアミド、
単官能アクリレートモノマーC:アクリロイルモルフォリン、
単官能アクリレートモノマーD:フェノキシエチルアクリレート、
可塑剤A:プロピレングリコールジベンゾエート、
可塑剤B:ジエチレングリコールジベンゾエート、
可塑剤C:ジプロピレングリコールジベンゾエート、
可塑剤D:ジプロピレングリコールジベンゾエート、
可塑剤E:ジブトキシエトキシエチルホルマール、
可塑剤F:ジブトキシエトキシエチルアジペート、
連鎖移動剤:3-メルカプトプロピオネート、
光重合開始剤A:1-ヒドロキシヘキシル-フェニル-ケトン、
光重合開始剤B:2, 4, 6-トリメチルベンゾイル-ジフェニル-フォスフィンオキサイド
図1は、アウトセル型タッチパネルを有する液晶表示装置の例であり、液晶パネル5とタッチパネル基板4との間、及び、該タッチパネル基板4と、加飾印刷2が施されたガラス基板1との間に本発明の光硬化性光学接着剤組成物が用いられた例である。
図2は、抵抗膜式タッチパネルを有する液晶表示装置の例であり、ITO7を配したフィルム又はガラス基材8と加飾印刷2が施されたガラス基板1との間に本発明の光硬化性光学接着剤組成物が用いられた例である。
図3は、インセル/オンセル方式のタッチパネルを有する液晶表示装置の例であり、液晶パネル5と、加飾印刷2が施されたガラス基板1との間に本発明の光硬化性光学接着剤組成物が用いられた例である。
2・・・加飾印刷
3・・・光硬化性光学接着剤層
4・・・タッチパネル基板
5・・・液晶パネル
6・・・段差
7・・・ITO
8・・・フィルム又はガラス基材
Claims (7)
- 前記柔軟構造を有するウレタン(メタ)アクリレート(A)が、アルキレン構造、ポリオキシアルキレン構造、脂肪族ポリエステル構造、又は脂肪族ポリカーボネート構造を柔軟構造として有するものである請求項1記載の光硬化性光学接着剤組成物。
- 前記化合物(C)の配合割合が、組成物中1~50質量%となる割合である請求項1記載の光硬化性光学接着剤組成物。
- 前記重合性希釈剤(B)の配合量が、前記ウレタン(メタ)アクリレート樹脂(A)との合成質量に対して、10~80質量%である請求項3記載の光硬化性光学接着剤組成物。
- 前記重合性希釈剤(B)が単官能型(メタ)アクリロイル基含有化合物である請求項1記載の光硬化性光学接着剤組成物。
- 請求項1~5の何れか一つに記載の光硬化性光学接着剤組成物を硬化させてなる硬化物。
- 請求項1~5の何れか一つに記載の光硬化性光学接着剤組成物を、液晶表示装置における液晶パネル又はタッチパネル基板上に塗布又は充填し、更にカバーガラス又はタッチパネル基板を張り合わせた後、光照射して硬化させてなることを特徴とする液晶表示装置。
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| CN201480003469.9A CN104854206B (zh) | 2013-11-29 | 2014-06-17 | 光固化性光学粘接剂组合物、其固化物、以及液晶显示装置 |
| KR1020157008547A KR20160090739A (ko) | 2013-11-29 | 2014-06-17 | 광경화성 광학 접착제 조성물, 그 경화물, 및 액정 표시 장치 |
| JP2014550558A JP5713155B1 (ja) | 2013-11-29 | 2014-06-17 | 光硬化性光学接着剤組成物、その硬化物、及び液晶表示装置 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021019868A1 (ja) * | 2019-07-29 | 2021-02-04 | 昭和電工株式会社 | 粘着シートおよび粘着剤組成物 |
| JP2021529236A (ja) * | 2018-06-28 | 2021-10-28 | エメラルド・カラマ・ケミカル・エルエルシーEmerald Kalama Chemical,LLC | 改善された反応性ポリウレタン系 |
| EP3907246A1 (en) * | 2020-05-07 | 2021-11-10 | ThreeBond Co., Ltd. | Photocurable resin composition, cured product, and laminate |
| JP2022544012A (ja) * | 2019-07-23 | 2022-10-17 | アダプティブ スリーディー テクノロジーズ、エルエルシー | 3d印刷用チオールアクリレートエラストマー |
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| JP6485601B2 (ja) * | 2016-10-11 | 2019-03-20 | Dic株式会社 | 光学物品用活性エネルギー線硬化型樹脂組成物、硬化物及び光学シート |
| CN110128995A (zh) * | 2019-04-17 | 2019-08-16 | 广东科学技术职业学院 | 一种可见光固化胶粘剂及其应用 |
| CN110387193A (zh) * | 2019-08-09 | 2019-10-29 | 苏州凡赛特材料科技有限公司 | 一种纳米金属导电膜用光学胶黏剂组合物及其胶膜 |
| CN116601264B (zh) * | 2020-12-25 | 2026-02-06 | 日本化药株式会社 | 含有蒽醌化合物的调光用液晶组合物、其光硬化物及调光元件 |
| KR102447220B1 (ko) * | 2021-12-14 | 2022-09-27 | 주식회사 크라텍 | 내황변성을 갖는 인테리어용 패널 |
| KR102895553B1 (ko) * | 2024-02-14 | 2025-12-04 | 동의대학교 산학협력단 | 굴절율 및 아베수가 향상된 투명 광학 접착제 조성물 |
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| JP7143455B2 (ja) | 2018-06-28 | 2022-09-28 | エメラルド・カラマ・ケミカル・エルエルシー | 改善された反応性ポリウレタン系 |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN104854206A (zh) | 2015-08-19 |
| KR20160090739A (ko) | 2016-08-01 |
| TW201520293A (zh) | 2015-06-01 |
| CN104854206B (zh) | 2019-04-09 |
| JPWO2015079728A1 (ja) | 2017-03-16 |
| JP5713155B1 (ja) | 2015-05-07 |
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