WO2022124685A1 - 점착제 조성물 및 그를 이용한 점착 시트 - Google Patents
점착제 조성물 및 그를 이용한 점착 시트 Download PDFInfo
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- WO2022124685A1 WO2022124685A1 PCT/KR2021/017987 KR2021017987W WO2022124685A1 WO 2022124685 A1 WO2022124685 A1 WO 2022124685A1 KR 2021017987 W KR2021017987 W KR 2021017987W WO 2022124685 A1 WO2022124685 A1 WO 2022124685A1
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- Prior art keywords
- sensitive adhesive
- pressure
- meth
- adhesive composition
- acrylate
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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
- C09J175/06—Polyurethanes from polyesters
-
- 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
-
- 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
-
- 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
-
- 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
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
- C09J2301/416—Additional features of adhesives in the form of films or foils characterized by the presence of essential components use of irradiation
Definitions
- the present invention relates to a pressure-sensitive adhesive composition and a pressure-sensitive adhesive sheet using the same, and more particularly, to a pressure-sensitive adhesive composition that exhibits high adhesion to various substrates and has excellent foldability, and a pressure-sensitive adhesive sheet using the same.
- an optically clear adhesive having high transparency is used for interlayer adhesion for stacking components in an image display device.
- OCA optically clear adhesive
- These optically transparent pressure-sensitive adhesives require high transmittance and low haze, and must satisfy physical properties such as adhesion to various substrates, heat resistance, and heat-and-moisture resistance.
- a flexible display device or foldable device that can maintain display performance even when bent like paper by using a flexible material such as plastic or UTG (ultra thin glass) instead of a conventional inflexible glass substrate
- a flexible material such as plastic or UTG (ultra thin glass) instead of a conventional inflexible glass substrate
- UTG ultra thin glass
- Korean Patent Registration No. 10-2084113 discloses a monomer mixture comprising an alkyl group-containing acrylate and a hydroxyl group-containing acrylate; And a pressure-sensitive adhesive composition comprising an initiator is disclosed.
- the pressure-sensitive adhesive composition has a problem in that it is difficult to secure excellent foldability, particularly, foldability at low temperature when applied to a foldable display device.
- One object of the present invention is to provide a pressure-sensitive adhesive composition that exhibits high adhesion to various substrates and has excellent foldability.
- Another object of the present invention is to provide a pressure-sensitive adhesive sheet formed by using the pressure-sensitive adhesive composition.
- the present invention provides a pressure-sensitive adhesive composition
- a pressure-sensitive adhesive composition comprising a urethane oligomer having a polyester backbone and a radically polymerizable functional group at at least one terminal, a diluting monomer, and a photoinitiator.
- the pressure-sensitive adhesive composition according to an embodiment of the present invention may have a storage modulus (G') of 3 to 30 kPa at -20°C and 1 Hz after curing.
- G' storage modulus
- the radically polymerizable functional group may be a (meth)acryloyloxy group or a vinyl group.
- the urethane oligomer may be a reactant of a polyester polyol, a polyisocyanate, and a radically polymerizable compound having a hydroxyl group.
- the polyester polyol may be a compound represented by the following formula (3).
- R is a divalent organic residue
- n is an integer from 1 to 100
- n is an integer from 0 to 100.
- the radically polymerizable compound having a hydroxyl group may include (meth)acrylate having a hydroxyl group.
- the dilution monomer may include a (meth)acrylate having a C 6 -C 30 alkyl group and a (meth)acrylic monomer having a polar functional group.
- the (meth)acrylic monomer having the polar functional group may be included in an amount of 3 to 30% by weight based on 100% by weight of the total dilution monomer.
- the mixing ratio of the urethane oligomer and the diluting monomer may be 1:9 to 5:5 by weight.
- the photoinitiator may be contained in an amount of 0.01 to 3 parts by weight based on 100 parts by weight of the total amount of the urethane oligomer and the diluting monomer.
- the present invention provides a pressure-sensitive adhesive sheet formed using the pressure-sensitive adhesive composition.
- the pressure-sensitive adhesive sheet according to an embodiment of the present invention may be for a foldable display.
- the pressure-sensitive adhesive composition according to the present invention has a polyester backbone, and exhibits high adhesion to various substrates, including a urethane oligomer having a radically polymerizable functional group at at least one end, and storage at -20°C and 1Hz of the pressure-sensitive adhesive layer after curing
- the elastic modulus (G') is low at a level of 3 to 30 kPa, and the foldability at low temperature is excellent.
- One embodiment of the present invention relates to a pressure-sensitive adhesive composition
- a pressure-sensitive adhesive composition comprising a urethane oligomer having a polyester backbone and a radically polymerizable functional group at at least one terminal, a diluent monomer, and a photoinitiator.
- the pressure-sensitive adhesive composition according to an embodiment of the present invention has a polyester backbone and includes a urethane oligomer having a radically polymerizable functional group at at least one end, thereby having a low storage modulus at low temperature and excellent foldability, and adhesion to various substrates This is excellent.
- the pressure-sensitive adhesive composition according to an embodiment of the present invention may have a storage modulus (G') of 3 to 30 kPa, preferably 3 to 20 kPa, at -20°C and 1 Hz after curing. After curing, if the storage modulus (G') is less than 3 kPa at -20°C and 1 Hz, it may be difficult to secure durability, and if it exceeds 30 kPa, it may be difficult to secure low-temperature foldability.
- G' storage modulus
- the storage modulus (G') means energy stored without loss due to elasticity, and the storage modulus (G') at -20 °C and 1 Hz is the storage modulus (G') measured at -20 °C and 1 Hz. indicates.
- the storage modulus (G ') at -20 °C and 1 Hz is, for example, after curing, for a sample having a pressure-sensitive adhesive layer having a thickness of 25 ⁇ m, using a viscoelasticity measuring device (MCR-301, Anton Paar) at a frequency of 1 Hz - It is a value measured at 20 °C.
- the urethane oligomer has a urethane bond in the molecule, has a polyester skeleton, and has a radically polymerizable functional group at at least one terminal.
- the radical polymerizable functional group may be a (meth)acryloyloxy group or a vinyl group, in particular a (meth)acryloyloxy group.
- the urethane oligomer may have a structure of Formula 1 below.
- A is polyester
- L is a linking group containing a urethane bond
- B 1 is an acryloyloxy group, a methacryloyloxy group, or a C 1 -C 10 alkoxy group
- B 2 is an acryloyloxy group or a methacryloyloxy group.
- C 1 -C 10 Alkoxy group refers to a straight-chain or branched alkoxy group having 1 to 10 carbon atoms, and includes methoxy, ethoxy, n-propanoxy, butoxy, etc., but is limited thereto not.
- the urethane oligomer may have a structure of Formula 2 below.
- A is polyester
- R 1 is absent or is a C 1 -C 10 alkylene group
- R 2 is a C 1 -C 10 alkylene group, a C 3 -C 10 cycloalkylene group or an arylene group,
- R 3 is a C 1 -C 10 alkylene group or a C 3 -C 10 cycloalkylene group
- B 1 is an acryloyloxy group, a methacryloyloxy group, or a C 1 -C 10 alkoxy group
- B 2 is an acryloyloxy group or a methacryloyloxy group.
- a C 1 -C 10 alkylene group means a straight-chain or branched hydrocarbon consisting of 1 to 10 carbon atoms, for example, methylene, ethylene, propylene, butylene, pentylene, hexylene, etc. included, but not limited thereto.
- a C 3 -C 10 cycloalkylene group refers to a simple or fused cyclic hydrocarbon consisting of 3 to 10 carbon atoms, for example, cyclopropylene, cyclobutylene, cyclopentylene, cyclohexylene, etc. included, but not limited thereto.
- the arylene group includes both an aromatic group, a heteroaromatic group, and partially reduced derivatives thereof.
- the aromatic group is a 5-membered to 15-membered simple or fused cyclic group
- the heteroaromatic group refers to an aromatic group containing at least one oxygen, sulfur or nitrogen.
- Representative examples of the arylene group include, but are not limited to, tolylene, phenylene, naphthylene, and the like.
- one or more hydrogens may be substituted with a C 1 -C 6 alkyl group, a C 1 -C 6 alkoxy group, halogen, or the like.
- the urethane oligomer may be prepared by a method known in the art.
- the urethane oligomer may be prepared by reacting a polyester polyol, diisocyanate, and a radically polymerizable compound having a hydroxyl group.
- a C 1 -C 10 alcohol compound may be further used.
- the polyester polyol may be obtained commercially or may be prepared and used by a method known in the art.
- polyester polyol examples include a polycaprolactone polyol obtained by ring-opening polymerization of a low molecular weight polyol and ⁇ -caprolactone.
- the polyester polyol may be a compound represented by the following formula (3).
- R is a divalent organic residue
- n is an integer from 1 to 100
- n is an integer from 0 to 100.
- R may be a C 1 -C 20 alkylene group.
- a C 1 -C 20 alkylene group refers to a linear or branched divalent hydrocarbon having 1 to 20 carbon atoms, for example, methylene, ethylene, propylene, butylene, pentylene, hexylene. , heptylene, octylene, nonylene, etc. are included, but are not limited thereto.
- R may be, for example, an ethylene group or a butylene group.
- the number average molecular weight of the polyester polyol may be 200 to 100,000. If the number average molecular weight of the polyester polyol is less than 200, it may be difficult to secure low-temperature foldability due to an increase in low-temperature elastic modulus, and if it exceeds 100,000, it may be difficult to synthesize a urethane oligomer in the process because the viscosity is too high.
- diisocyanate compound an aliphatic diisocyanate compound and/or an aromatic diisocyanate compound may be used.
- aliphatic diisocyanate compound examples include methyl diisocyanate, 1,2-ethanediyl diisocyanate, 1,3-propanediyl diisocyanate, 1,4-butanediyl diisocyanate, 1,6-hexanediyl diisocyanate, 3-methyl -octane-1,8-diyl diisocyanate, 1,2-cyclopropanediyl diisocyanate, 1,3-cyclobutanediyl diisocyanate, 1,3-cyclopentanediyl diisocyanate, 1,4-cyclohexanediyl diisocyanate , 1,3-cyclohexanediyl diisocyanate, dicyclohexylmethane 4,4'-diisocyanate, isophorone diisocyanate, cyclohexene 1,4-diisocyanate, 4-methyl-cyclohe
- aromatic diisocyanate compound examples include 1,2-phenylene diisocyanate, 1,3-phenylene diisocyanate, 1,4-phenylene diisocyanate, 3-chloro-1,2-benzene diisocyanate, and 4-chloro- 1,2-benzene diisocyanate, 5-chloro-1,2-benzene diisocyanate, 2-chloro-1,3-benzene diisocyanate, 4-chloro-1,3-benzene diisocyanate, 5-chloro-1, 3-Benzene diisocyanate, 2-chloro-1,4-benzene diisocyanate, 3-chloro-1,4-benzene diisocyanate, 3-methyl-1,2-benzene diisocyanate, 4-methyl-1,2- Benzene diisocyanate, 5-methyl-1,2-benzene diisocyanate, 2-methyl-1,3-benzene diisocyanate, 4-methyl-1,3-benzene diisocyanate, 5-methyl-1,
- a hydroxyl group-containing (meth)acrylate compound can be used as the radically polymerizable compound having a hydroxyl group.
- the hydroxyl group-containing (meth)acrylate compound include hydroxymethyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, 3-hydroxy-n-propyl (meth)acrylate, and 2-hydroxy- n-propyl (meth)acrylate, 2-hydroxyisopropyl (meth)acrylate, 2-hydroxy-n-butyl (meth)acrylate, 3-hydroxy-n-butyl (meth)acrylate, 5 -Hydroxy-n-pentyl (meth)acrylate, 2-hydroxy-n-pentyl (meth)acrylate, 3-hydroxy-n-pentyl (meth)acrylate, 4-hydroxy-n-pentyl ( and meth)acrylate, 2-hydroxycyclopropyl (meth)acrylate, 3-hydroxycyclopentyl (meth)acrylate, 4-hydroxycyclo
- Examples of the C 1 -C 10 alcohol compound include methanol, ethanol, n-propanol, and butanol.
- the urethane oligomer may have a weight average molecular weight (in terms of polystyrene) of 1,000 to 200,000, preferably 10,000 to 100,000, measured by gel permeation chromatography (GPC).
- GPC gel permeation chromatography
- the diluent monomer is a component that can act as a dispersion medium for the urethane oligomer and can be polymerized by the action of a photoinitiator.
- the diluent monomer can be easily coated by diluting the pressure-sensitive adhesive composition to adjust the viscosity.
- the dilution monomer may include a (meth)acrylic monomer.
- (meth)acryl means acryl and/or methacryl.
- the dilution monomer may include a (meth)acrylate having a C 6 -C 30 alkyl group and a (meth)acrylic monomer having a polar functional group.
- the (meth)acrylate having a C 6 -C 30 alkyl group has a low glass transition temperature (Tg) and can lower the storage modulus after curing of the pressure-sensitive adhesive composition, thereby improving foldability.
- Tg glass transition temperature
- Examples of the (meth)acrylate having an alkyl group of C 6 -C 30 include hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, heptyl (meth) acrylate, n-octyl (meth) acrylate, Nonyl (meth) acrylate, decyl (meth) acrylate, isodecyl (meth) acrylate, undecyl (meth) acrylate, dodecyl (meth) acrylate, tridecyl (meth) acrylate, cetyl (meth) Acrylate, stearyl (meth) acrylate, isostearyl (meth) acrylate and the like can be used, and among these, 2-ethylhexyl (meth) acrylate and the like are preferable. These can be used individually or in combination of 2 or more types.
- the (meth)acrylic monomer having the polar functional group can form a hydrogen bond or an ionic bond with the polar group of the lower substrate, thereby improving the adhesion of the pressure-sensitive adhesive composition.
- the (meth)acryl monomer having a polar functional group may be at least one of (meth)acrylate having a hydroxyl group and (meth)acrylamide having a nitrogen atom.
- Examples of the (meth)acrylate having a hydroxyl group include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 4-hydroxybutyl ( Meth) acrylate, 6-hydroxyhexyl (meth) acrylate, 2-hydroxyethylene glycol (meth) acrylate, 2-hydroxypropylene glycol (meth) acrylate, hydroxy having 2-4 carbon atoms in the alkylene group and hydroxyalkylene glycol (meth)acrylate, and among these, 4-hydroxybutyl acrylate and 2-hydroxyethyl (meth)acrylate are preferable.
- Examples of the (meth)acrylamide having a nitrogen atom include (meth)acrylamide, dimethyl (meth)acrylamide, acryloylmorpholine, dimethylaminopropyl (meth)acrylamide, isopropyl (meth)acrylamide, diethyl (meth)acrylamide, hydroxyethyl (meth)acrylamide, diacetone (meth)acrylamide, etc. are mentioned.
- the (meth)acrylic monomer having the polar functional group may be included in an amount of 3 to 30% by weight based on 100% by weight of the total dilution monomer.
- the content of the (meth)acrylic monomer having the polar functional group is less than 3% by weight, the adhesion may be lowered, and if it exceeds 30% by weight, the low-temperature elastic modulus may be increased.
- the mixing ratio of the urethane oligomer and the diluting monomer may be 1:9 to 5:5, preferably 2:8 to 6:4 by weight. If the amount of the urethane oligomer in the mixing ratio of the urethane oligomer and the dilution monomer is less than the above range, the thickness deviation may increase in the sheet manufacturing process, and if it is more than the above range, the adhesion may be lowered, thereby reducing reliability.
- the diluent monomer may further include other polymerizable monomers in addition to the monomers.
- the other polymerizable monomer examples include n-butyl (meth) acrylate, 2-butyl (meth) acrylate, t-butyl (meth) acrylate, ethyl (meth) acrylate, methyl (meth) acrylate , n-propyl (meth) acrylate, isopropyl (meth) acrylate, pentyl (meth) acrylate, isobornyl (meth) acrylate, etc., among these, isobornyl (meth) acrylate is preferable. . These can be used individually or in mixture of 2 or more types.
- the other polymerizable monomer may be included in an amount of 10% by weight or less based on 100% by weight of the total dilution monomer.
- the content of the other polymerizable monomer is more than 10% by weight, the low-temperature elastic modulus may increase.
- the photoinitiator means an initiator that absorbs an active energy ray to generate a radical.
- the photoinitiators include, for example, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin-n-butyl ether, benzoin isobutyl ether, acetophenone, dimethylaminoacetophenone, 2 ,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxy-2-phenylacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl Ketone, 2-methyl-1-[4-(methylthio)phenyl]-2-morpholino-propan-1-one, 4-(2-hydroxyethoxy)phenyl-2-(hydroxy-2- Propyl) ketone, benzophenone, p-phenylbenzophenone, 4,4'-bis(diethylamino)benzophenone (EAB-F), dichlorobenzophenone, 2-methyl anthraquinon
- the photoinitiator may be contained in an amount of 0.01 to 3 parts by weight based on 100 parts by weight of the total amount of the urethane oligomer and the diluent monomer. When the amount is less than 0.01 parts by weight, photocuring does not proceed sufficiently, making it difficult to implement mechanical properties or adhesion of the finally obtained pressure-sensitive adhesive sheet.
- the pressure-sensitive adhesive compositions according to an embodiment of the present invention include a plasticizer, a silane coupling agent, and adhesiveness in order to control the adhesive force, cohesive force, viscosity, elastic modulus, glass transition temperature, antistatic property, etc. required according to the use.
- Additives such as imparting resins, antioxidants, corrosion inhibitors, leveling agents, surface lubricants, dyes, pigments, defoamers, fillers, light stabilizers, and antistatic agents may be further included.
- One embodiment of the present invention relates to a pressure-sensitive adhesive sheet formed using the pressure-sensitive adhesive composition.
- the pressure-sensitive adhesive sheet may be one in which the pressure-sensitive adhesive layer is formed from the pressure-sensitive adhesive composition according to the present invention on the base film, or the pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive composition according to the present invention is interposed between two base films.
- the base film may include a polyolefin-based film, a polyester-based film, an acrylic film, a styrene-based film, an amide-based film, a polyvinyl chloride film, a polyvinylidene chloride film, a polycarbonate film, and the like, and these are silicone-based, fluorine-based, silica It may be a mold release treatment suitably made with powder or the like.
- the thickness of the base film is preferably 30 to 80 ⁇ m. When the thickness is less than 30 ⁇ m, the base film is vulnerable to engraving defects, and when it exceeds 80 ⁇ m, handling properties may be deteriorated.
- An adhesive layer can be formed by the method of coating an adhesive composition on one base film.
- the coating method is not particularly limited as long as it is a method known in the art, and for example, a method such as a bar coater, air knife, gravure, reverse roll, kiss roll, spray, blade, die coater, casting, spin coating, etc. can be used. .
- it can be formed by coating the pressure-sensitive adhesive composition on one base film, irradiating it with an ultraviolet irradiation amount of about 100 to 2000 mJ/cm 2 , preferably 200 to 1500 mJ/cm 2 , and photocuring it.
- the pressure-sensitive adhesive layer may have a thickness of 10 to 2,000 ⁇ m, preferably 25 to 1,500 ⁇ m. If the thickness of the pressure-sensitive adhesive layer is less than 10 ⁇ m, it may be difficult to buffer an impact generated from the outside, and if it exceeds 2,000 ⁇ m, transmission may be lowered and optical performance may be deteriorated.
- the adhesive sheet according to an embodiment of the present invention may improve adhesion by surface-treating the adhesive layer before bonding.
- the surface treatment method is not particularly limited, and for example, the surface of the pressure-sensitive adhesive layer may be activated by a method such as corona discharge treatment, plasma treatment, ultraviolet irradiation, electron beam irradiation, or applying an anchoring agent.
- the pressure-sensitive adhesive sheet according to an embodiment of the present invention is applicable to not only a general flat panel display and a flexible display but also a foldable display.
- the pressure-sensitive adhesive sheet according to an embodiment of the present invention has excellent foldability because the storage modulus at low temperature is controlled to be in the range of 3 to 30 kPa, so it can be effectively applied to interlayer adhesion for laminating components in a foldable display device.
- the adhesive sheet may be applied to bonding various display materials such as an antenna, a display panel, a polarizer, a touch sensor, a cover window, a bezel, a polymer film, and an FPCB.
- polycaprolactone diol having a number average molecular weight of 1230 [manufactured by Daicel Chemical Industry Co., Ltd., trade name: Placcel212] 500 ppm of dibutyltin dilaurate catalyst (DBTDL) and 10 parts by weight of isophorone diisocyanate at 80 ° C.
- DBTDL dibutyltin dilaurate catalyst
- a urethane oligomer having a weight average molecular weight of 60,000 was prepared by reacting 9 parts by weight of 2-hydroxyethyl acrylate with the isocyanate polymer obtained by the reaction.
- polycaprolactone diol having a number average molecular weight of 2000 [manufactured by Daicel Chemical Industry Co., Ltd., trade name: Placcel220] 500 ppm of dibutyltin dilaurate catalyst (DBTDL) and 10 parts by weight of isophorone diisocyanate at 80 ° C.
- DBTDL dibutyltin dilaurate catalyst
- a urethane oligomer having a weight average molecular weight of 80,000 was prepared by reacting 9 parts by weight of 2-hydroxyethyl acrylate with the isocyanate polymer obtained by the reaction.
- polycaprolactone diol having a number average molecular weight of 1230 [manufactured by Daicel Chemical Industry Co., Ltd., trade name: Placcel212] 500 ppm of dibutyltindilaurate catalyst (DBTDL) and 1,6-hexamethylene diisocyanate 10 parts by weight
- DBTDL dibutyltindilaurate catalyst
- 1,6-hexamethylene diisocyanate 10 parts by weight A urethane oligomer having a weight average molecular weight of 70,000 was prepared by reacting 9 parts by weight of 2-hydroxyethyl acrylate with an isocyanate polymer obtained by reacting the parts at 80°C.
- an isocyanate polymer obtained by reacting 81 parts by weight of polypropylene glycol having a number average molecular weight of 1000 (Hannon-Hwaseong, PPG1000) with 10 parts by weight of isophorone diisocyanate with 500 ppm of dibutyltin dilaurate catalyst (DBTDL) at 80° C.
- DBTDL dibutyltin dilaurate catalyst
- a pressure-sensitive adhesive composition was prepared by mixing the composition shown in Table 1 below (parts by weight).
- ACMO acryloyl morpholine
- I-184 Igacure 184 (BASF)
- the pressure-sensitive adhesive compositions of Examples 1 to 5 and Comparative Examples 1 and 2 prepared above were coated on a release-treated polyethylene terephthalate film (thickness: 75 ⁇ m) using a bar coater. Thereafter, an adhesive sheet was prepared so that the thickness after curing of the pressure-sensitive adhesive composition was 50 ⁇ m by irradiating ultraviolet rays with a light amount of 2.0 J/cm 2 for 10 minutes using a UV lamp to cure the pressure-sensitive adhesive composition.
- Alkali glass with an adhesive sheet is pressed in an autoclave (50°C, 5 atm) for about 20 minutes, stored for 1 hour in constant temperature and humidity conditions (23°C, 50% relative humidity), and then TA equipment (Texture Analyzer (manufactured by Stable Microsystems, UK), the pressure-sensitive adhesive sheet was peeled from the alkali glass at a peeling rate of 300 mm/min and a peeling angle of 180 degrees to measure room temperature adhesion.
- TA equipment Textture Analyzer (manufactured by Stable Microsystems, UK
- PET polyethylene terephthalate
- the storage modulus at -20°C was measured using a viscoelasticity measuring device (MCR-301, Anton Paar). More specifically, the size of the adhesive sheet was cut to 30 mm in length ⁇ 30 mm in width, and the release film attached to one side of the cut adhesive sheet was removed, and then bonded to a glass substrate, and then the measuring tip and In the adhered state, measurements were made under the conditions of a frequency of 1.0 Hz, a strain of 2%, and a temperature increase rate of 5°C/min in a temperature range of -30 to 100°C, and the measured value at -20°C was read at this time.
- MCR-301 viscoelasticity measuring device
- the adhesive sheets prepared in Examples and Comparative Examples were bonded to a 50 ⁇ m PET film, cut into 20 mm ⁇ 100 mm, and used as a specimen. Fix the specimen to a flexibility evaluation device (COVOTECH, CFT-720C) for evaluation of foldability, make it fold with a radius of curvature of 2mm, fold 25 times per minute, and hold 0.2 seconds after folding -20 Foldability was evaluated under the condition of °C.
- foldability evaluation one folding is referred to as 1 cycle, and the number of first cycles in which streaks or other stripes occur in the folding area or breakage, lifting, peeling, etc. of the adhesive sheet are evaluated. , when lifting, peeling, etc. occurred, it was judged as NG, and if not, it was judged as OK.
- the pressure-sensitive adhesive composition of Examples 1 to 5 comprising a urethane oligomer, a diluent monomer and a photoinitiator having a polyester backbone and a radically polymerizable functional group at at least one terminal according to the present invention. It can be seen that the adhesion to the substrate is excellent, and the storage modulus (G') of the pressure-sensitive adhesive layer at -20°C and 1 Hz after curing is low at a level of 3 to 30 kPa, indicating excellent foldability.
- the pressure-sensitive adhesive composition of Comparative Examples 1 and 2 using a urethane oligomer having a polyester backbone and a polyether backbone instead of a urethane oligomer having a radically polymerizable functional group at at least one terminal is cured at -20°C and 1Hz of the pressure-sensitive adhesive layer
- the storage modulus (G ') in it was found that the foldability was poor in excess of 30 kPa.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Adhesive Tapes (AREA)
Abstract
Description
| 실시예 | 비교예 | |||||||
| 1 | 2 | 3 | 4 | 5 | 1 | 2 | ||
| 우레탄 올리고머 | 제조예1 | 40 | 40 | |||||
| 제조예2 | 40 | 20 | ||||||
| 제조예3 | 40 | |||||||
| 제조예4 | 40 | 20 | ||||||
| 희석 모노머 | 2-EHA | 50 | 50 | 50 | 60 | 53 | 50 | 60 |
| 4-HBA | 10 | 10 | 10 | 5 | 10 | |||
| 2-HEA | 20 | 20 | ||||||
| ACMO | 2 | |||||||
| 광개시제 | I-184 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 구분 | 실시예 | 비교예 | ||||||
| 1 | 2 | 3 | 4 | 5 | 1 | 2 | ||
| 밀착력(N/25㎜) | 알카리 유리 | 12 | 13 | 12 | 15 | 11 | 4 | 6 |
| PET | 9 | 8 | 7 | 11 | 9 | 3 | 5 | |
| 저장탄성율(Pa) | -20℃ | 13000 | 8000 | 15000 | 12000 | 16000 | 36000 | 34000 |
| -20℃ 폴딩성(회) | 5만 OK | 5만 OK | 5만 OK | 5만 OK | 5만 OK | 1천회 NG | 1천회 NG | |
| 고온신뢰성 | OK | OK | OK | OK | OK | OK | OK | |
Claims (12)
- 폴리에스테르 골격을 가지고, 적어도 한쪽 말단에 라디칼 중합성 관능기를 갖는 우레탄 올리고머, 희석 모노머 및 광개시제를 포함하는 점착제 조성물.
- 제1항에 있어서, 경화 후 -20℃ 및 1Hz에서 저장탄성율(G')이 3 내지 30 kPa인 점착제 조성물.
- 제1항에 있어서, 상기 라디칼 중합성 관능기는 (메타)아크릴로일옥시기 또는 비닐기인 점착제 조성물.
- 제1항에 있어서, 상기 우레탄 올리고머는 폴리에스테르 폴리올, 폴리이소시아네이트 및 히드록시기를 갖는 라디칼 중합성 화합물의 반응물인 점착제 조성물.
- 제4항에 있어서, 상기 히드록시기를 갖는 라디칼 중합성 화합물은 히드록시기를 갖는 (메타)아크릴레이트를 포함하는 점착제 조성물.
- 제1항에 있어서, 상기 희석 모노머는 C6-C30의 알킬기를 갖는 (메타)아크릴레이트 및 극성 관능기를 갖는 (메타)아크릴 모노머를 포함하는 점착제 조성물.
- 제7항에 있어서, 상기 극성 관능기를 갖는 (메타)아크릴 모노머는 전체 희석 모노머 100 중량%에 대하여 3 내지 30 중량%의 양으로 포함되는 점착제 조성물.
- 제1항에 있어서, 상기 우레탄 올리고머와 희석 모노머의 혼합비는 중량 기준으로 1:9 내지 5:5인 점착제 조성물.
- 제1항에 있어서, 상기 광개시제는 상기 우레탄 올리고머와 희석 모노머 합계량 100 중량부에 대하여 0.01 내지 3 중량부의 양으로 함유되는 점착제 조성물.
- 제1항 내지 제10항 중 어느 한 항에 따른 점착제 조성물을 이용하여 형성된 점착 시트.
- 제11항에 있어서, 폴더블 디스플레이용인 점착 시트.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202180082372.1A CN116529330A (zh) | 2020-12-08 | 2021-12-01 | 粘着剂组合物和利用其的粘着片 |
| JP2023533326A JP2023552536A (ja) | 2020-12-08 | 2021-12-01 | 粘着剤組成物及びそれを用いた粘着シート |
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|---|---|---|---|
| KR10-2020-0170788 | 2020-12-08 | ||
| KR1020200170788A KR20220081182A (ko) | 2020-12-08 | 2020-12-08 | 점착제 조성물 및 그를 이용한 점착 시트 |
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| Publication Number | Publication Date |
|---|---|
| WO2022124685A1 true WO2022124685A1 (ko) | 2022-06-16 |
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|---|---|
| JP (1) | JP2023552536A (ko) |
| KR (1) | KR20220081182A (ko) |
| CN (1) | CN116529330A (ko) |
| WO (1) | WO2022124685A1 (ko) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100454809B1 (ko) * | 1995-11-03 | 2005-01-15 | 코닌클리즈케 디에스엠 엔.브이. | 무용제방사선-경화성광학유리섬유코팅조성물및이를제조하는무용제방법 |
| KR20060082910A (ko) * | 2005-01-13 | 2006-07-20 | 주식회사 씨씨텍 | 플라즈마 디스플레이 패널의 전극보호용 자외선 경화형난연성 수지 조성물 |
| KR20150075943A (ko) * | 2013-12-26 | 2015-07-06 | 황진상 | 디스플레이 패널의 전극보호용 무기입자 함유 자외선 경화형 수지 조성물 |
| KR20160014735A (ko) * | 2016-01-18 | 2016-02-11 | 에스엠에스주식회사 | 고탄성 및 저유전율 특성을 갖는 광학 점착제 조성물 |
| JP2017031301A (ja) * | 2015-07-31 | 2017-02-09 | 東洋インキScホールディングス株式会社 | 熱硬化性接着シート、およびその利用 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102084113B1 (ko) | 2017-05-22 | 2020-03-04 | 삼성에스디아이 주식회사 | 점착필름, 이를 포함하는 광학 부재 및 이를 포함하는 광학표시장치 |
-
2020
- 2020-12-08 KR KR1020200170788A patent/KR20220081182A/ko not_active Abandoned
-
2021
- 2021-12-01 CN CN202180082372.1A patent/CN116529330A/zh not_active Withdrawn
- 2021-12-01 JP JP2023533326A patent/JP2023552536A/ja active Pending
- 2021-12-01 WO PCT/KR2021/017987 patent/WO2022124685A1/ko not_active Ceased
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100454809B1 (ko) * | 1995-11-03 | 2005-01-15 | 코닌클리즈케 디에스엠 엔.브이. | 무용제방사선-경화성광학유리섬유코팅조성물및이를제조하는무용제방법 |
| KR20060082910A (ko) * | 2005-01-13 | 2006-07-20 | 주식회사 씨씨텍 | 플라즈마 디스플레이 패널의 전극보호용 자외선 경화형난연성 수지 조성물 |
| KR20150075943A (ko) * | 2013-12-26 | 2015-07-06 | 황진상 | 디스플레이 패널의 전극보호용 무기입자 함유 자외선 경화형 수지 조성물 |
| JP2017031301A (ja) * | 2015-07-31 | 2017-02-09 | 東洋インキScホールディングス株式会社 | 熱硬化性接着シート、およびその利用 |
| KR20160014735A (ko) * | 2016-01-18 | 2016-02-11 | 에스엠에스주식회사 | 고탄성 및 저유전율 특성을 갖는 광학 점착제 조성물 |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20220081182A (ko) | 2022-06-15 |
| CN116529330A (zh) | 2023-08-01 |
| JP2023552536A (ja) | 2023-12-18 |
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