Classifications

• • 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
  • C08G18/67—Unsaturated compounds having active hydrogen
  • C08G18/675—Low-molecular-weight compounds
  • C08G18/6755—Unsaturated carboxylic acids
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  • 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
  • C08G18/08—Processes
  • C08G18/16—Catalysts
  • C08G18/22—Catalysts containing metal compounds
  • C08G18/227—Catalysts containing metal compounds of antimony, bismuth or arsenic
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  • 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
  • C08F299/00—Macromolecular compounds obtained by interreacting polymers involving only carbon-to-carbon unsaturated bond reactions, in the absence of non-macromolecular monomers
  • C08F299/02—Macromolecular compounds obtained by interreacting polymers involving only carbon-to-carbon unsaturated bond reactions, in the absence of non-macromolecular monomers from unsaturated polycondensates
  • C08F299/06—Macromolecular compounds obtained by interreacting polymers involving only carbon-to-carbon unsaturated bond reactions, in the absence of non-macromolecular monomers from unsaturated polycondensates from polyurethanes
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  • 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
  • C08F299/00—Macromolecular compounds obtained by interreacting polymers involving only carbon-to-carbon unsaturated bond reactions, in the absence of non-macromolecular monomers
  • C08F299/02—Macromolecular compounds obtained by interreacting polymers involving only carbon-to-carbon unsaturated bond reactions, in the absence of non-macromolecular monomers from unsaturated polycondensates
  • C08F299/06—Macromolecular compounds obtained by interreacting polymers involving only carbon-to-carbon unsaturated bond reactions, in the absence of non-macromolecular monomers from unsaturated polycondensates from polyurethanes
  • C08F299/065—Macromolecular compounds obtained by interreacting polymers involving only carbon-to-carbon unsaturated bond reactions, in the absence of non-macromolecular monomers from unsaturated polycondensates from polyurethanes from polyurethanes with side or terminal unsaturations
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  • 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
  • C08G18/08—Processes
  • C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
• • 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
  • C08G18/30—Low-molecular-weight compounds
  • C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
  • C08G18/3203—Polyhydroxy compounds
  • C08G18/3215—Polyhydroxy compounds containing aromatic groups or benzoquinone 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
  • C08G18/28—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
• • 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
  • C08G18/28—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
  • C08G18/4829—Polyethers containing at least three 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
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/67—Unsaturated compounds having active hydrogen
  • C08G18/671—Unsaturated compounds having only one group containing active hydrogen
  • C08G18/672—Esters of acrylic or alkyl acrylic acid having only one group containing active hydrogen
• • 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
• • 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
  • C08G18/81—Unsaturated isocyanates or isothiocyanates
  • C08G18/8108—Unsaturated isocyanates or isothiocyanates having only one isocyanate or isothiocyanate group
  • C08G18/8116—Unsaturated isocyanates or isothiocyanates having only one isocyanate or isothiocyanate group esters of acrylic or alkylacrylic acid having only one isocyanate or isothiocyanate group
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
  • C09D175/04—Polyurethanes
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
  • C09D175/04—Polyurethanes
  • C09D175/14—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
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
  • C09D175/04—Polyurethanes
  • C09D175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
  • C09D175/16—Polyurethanes having carbon-to-carbon unsaturated bonds having terminal carbon-to-carbon unsaturated bonds
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  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16

Definitions

• the present invention relates to a urethane (meth)acrylate suitable for coating agents, a method for producing the same, a curable composition containing the urethane (meth)acrylate, and a cured product thereof.
• urethane (meth)acrylate As a monomer, functional polymers with excellent properties such as flexibility, toughness, impact resistance, and adhesion can be obtained. It is a highly versatile compound. As an example of its use, use as a component of a coating agent for protecting the surface of a display, touch panel, or the like of an image display device to prevent scratches, cracks, or the like.
• an isocyanate group-terminated prepolymer obtained by reacting a polyol and a polyisocyanate so that the molar ratio of the hydroxyl group of the polyol to the isocyanate group of the polyisocyanate is greater than 1, a hydroxyl group and
• a common method is to react with a compound having a (meth)acryloyloxy group (eg, 2-hydroxyethyl acrylate, etc.).
• a synthesis method is also known in which a polyol is reacted with a compound having an isocyanate group and a (meth)acryloyloxy group.
• the type of raw material polyol greatly affects the difference in the properties of the cured product obtained using the urethane (meth)acrylate as a monomer.
• Patent Document 1 an isocyanate group-terminated prepolymer synthesized using polypropylene glycol having three hydroxyl groups and a hydroxyl value-based molecular weight of 4000 to 7000 is reacted with 2-hydroxyethyl acrylate.
• Urethane (meth)acrylates are described.
• devices that have a structure that can be folded on the surface are required to be tough and have shape recoverability when folded.
• the present invention has been made in view of such circumstances, and has a viscosity that is easy to handle, and when cured, has a large tensile strength, excellent toughness and shape recovery when bent, and a shape.
• An object of the present invention is to provide a urethane (meth)acrylate from which a cured product having excellent retention can be obtained.
• the present invention provides that a cured product obtained from a urethane (meth)acrylate having a specific polyol-derived structure has small residual strain, good toughness and good shape recovery when bent, and is excellent in shape retention.
• a urethane (meth)acrylate represented by the following formula (1) and having a number average molecular weight (Mn) of 7,500 to 60,000.
• R 1 —[OC( O)NH—R 2 ] n
• R 1 is an n-valent residue obtained by removing a hydroxyl group from a polyol having n hydroxyl groups in one molecule, selected from polyether polyols, polyester polyols and polycarbonate polyols, and n is 3.
• each of the n R 2s in one molecule is independently a residue obtained by removing the isocyanate group from a monoisocyanate having one or more (meth)acryloyloxy groups in one molecule.
• Mw/Mn weight average molecular weight
• Mn number average molecular weight
• n is 4 to 10.
• a method for producing a urethane (meth)acrylate, wherein 1 mol part of a polyol having n hydroxyl groups in one molecule and n mol parts of a monoisocyanate undergo a urethanization reaction to obtain a reaction product A method for producing a urethane (meth)acrylate, wherein the urethane (meth)acrylate has a number average molecular weight (Mn) of 7500 to 60000 and is represented by the following formula (1).
• R 1 is an n-valent residue obtained by removing a hydroxyl group from a polyol having n hydroxyl groups in one molecule, selected from polyether polyols, polyester polyols and polycarbonate polyols, and n is 3.
• each of the n R 2s in one molecule is independently a residue obtained by removing the isocyanate group from a monoisocyanate having one or more (meth)acryloyloxy groups in one molecule.
• [11] A curable composition containing the urethane (meth)acrylate according to any one of [1] to [6].
• [12] The curable composition according to [11], wherein the urethane (meth)acrylate content in the curable composition is 50% by mass or more.
• [14] A cured product obtained by curing the curable composition according to any one of [11] to [13].
• An article comprising the cured product of [14].
• a urethane that has a viscosity that is excellent in handleability and that can be cured to obtain a cured product that has high tensile strength, excellent toughness, excellent shape recovery when bent, and excellent shape retention.
• (Meth)acrylates can be provided. Therefore, the urethane (meth)acrylate of the present invention is useful, for example, as a coating agent for surface protection of flexible displays and foldable devices.
• (Meth)acryloyloxy is a generic term for acryloyloxy and methacryloyloxy.
• (meth)acryl is a generic term for acrylic and methacrylic
• (meth)acrylate is a generic term for acrylate and methacrylate.
• the number average molecular weight (Mn) and weight average molecular weight (Mw) are polystyrene equivalent molecular weights determined by gel permeation chromatography (GPC) based on a calibration curve prepared using a standard polystyrene sample.
• hydroxyl value equivalent molecular weight is a value calculated from the formula: 56100 x (number of hydroxyl groups in one molecule)/(hydroxyl value [mgKOH/g]). A hydroxyl value is calculated
• the "NCO index” is the equivalent ratio of the isocyanate group of the isocyanate compound to the hydroxyl group of the polyol expressed as a percentage.
• the urethane (meth)acrylate of the present invention is represented by the following formula (1) and has an Mn of 7,500 to 60,000.
• R 1 is an n-valent residue obtained by removing a hydroxyl group from a polyol having n hydroxyl groups in one molecule, selected from polyether polyols, polyester polyols and polycarbonate polyols, and n is 3. That's it.
• Each of the n R 2s in one molecule is independently a residue obtained by removing the isocyanate group from a monoisocyanate having one or more (meth)acryloyloxy groups in one molecule.
• Such urethane (meth)acrylates have a higher-molecular-weight polyol-derived skeleton than conventional urethane (meth)acrylates and have a narrower molecular weight distribution. likely to be formed. For this reason, even if it has a high molecular weight, it has relatively low viscosity, is excellent in handleability, has high tensile strength, high storage shear modulus, low residual strain, and excellent toughness and shape recovery when bent. And, a cured product having excellent shape retention can be obtained.
• the urethane (meth)acrylate of the present invention is a compound represented by the formula (1).
• Urethane (meth)acrylate is preferably urethane acrylate from the viewpoint of rapid polymerization.
• R 1 is an n-valent residue obtained by removing a hydroxyl group from a polyol having n hydroxyl groups in one molecule, selected from polyether polyols, polyester polyols and polycarbonate polyols, and n is 3. That's it.
• n is the average number of hydroxyl groups in one molecule calculated from the content of each polyol.
• the polyol has 3 or more, preferably 4 to 10, more preferably 4 to 8 hydroxyl groups in one molecule.
• a cured product of a urethane (meth)acrylate having a skeleton derived from a polyol having such a number of hydroxyl groups forms a high-density crosslinked network, and can easily obtain good shape retention.
• the number of hydroxyl groups is 4 or more, it is easy to obtain a cured product of urethane (meth)acrylate that has a high storage shear modulus, high tensile strength, and high surface hardness. hard.
• a cured product of urethane (meth)acrylate having a skeleton derived from a polyol having 10 or less hydroxyl groups has better shape stability.
• a polyether polyol is preferable from the viewpoint that the cured product obtained from the urethane (meth)acrylate has better shape recoverability when bent.
• the polyether polyol is preferably a polymer having 3 or more hydroxyl groups and having an oxyalkylene group as a structural unit.
• a polyether polyol can be obtained by ring-opening polymerization of a compound having a cyclic ether structure with an initiator having 3 or more active hydrogens. Moreover, a commercial item can also be used.
• the polyether polyol may be used singly or in combination of two or more.
• the oxyalkylene group preferably contains a linear or branched alkylene group having 1 to 14 carbon atoms, more preferably 2 to 4 carbon atoms.
• the oxyalkylene group may be used singly or in combination of two or more.
• the oxyalkylene group is preferably one or more selected from an oxyethylene group, an oxypropylene group and an oxytetramethylene group, and more preferably includes an oxypropylene group.
• the oxypropylene group is preferably 50% by mass or more, more preferably 60 to 100% by mass, in 100% by mass of all oxyalkylene groups.
• the content of oxypropylene groups in all oxyalkylene groups corresponds to the amount of propylene oxide blended with respect to the total blended amount of 100 parts by mass of the originating raw materials constituting the oxyalkylene groups when synthesizing the polyether polyol. regarded as a thing.
• Examples of compounds having a cyclic ether structure include ethylene oxide, propylene oxide, 1,2-butylene oxide, 2,3-butylene oxide, methyl glycidyl ether, butyl glycidyl ether, 2-ethylhexyl glycidyl ether, lauryl glycidyl ether, hexyl Glycidyl ether, tetrahydrofuran can be mentioned.
• ethylene oxide and propylene oxide are preferred.
• the group having active hydrogen in the initiator includes, for example, a hydroxyl group, a carboxy group, and an amino group having a hydrogen atom bonded to a nitrogen atom.
• a hydroxyl group is preferred, and an alcoholic hydroxyl group is more preferred.
• initiators having 3 or more active hydrogens include glycerin, trimethylolethane, trimethylolpropane, 1,2,6-hexanetriol, pentaerythritol, diglycerin, dipentaerythritol, sorbitol, sucrose, and polyoxyalkylene.
• polyols polyoxyethylene polyol, polyoxypropylene polyol
• polyols such as triethanolamine
• amines such as ethylenediamine and diethylenetriamine.
• polyols are preferred, polyoxyalkylene polyols are more preferred, and polyoxypropylene polyols are even more preferred.
• the initiator having 3 or more active hydrogens may be used singly or in combination of two or more.
• the initiator may contain a glycol.
• glycols include ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, butylene glycol, 1,4-butanediol, 1,6-hexanediol, 3-methyl-1,5-pentanediol, triethylene glycol, tripropylene glycol and polyoxyalkylene diols.
• Glycols used in combination with the initiator having 3 or more active hydrogens may be used alone or in combination of two or more. When the initiator having 3 or more active hydrogens contains glycol, it is preferable to combine the initiator having 4 or more active hydrogens with the glycol so that n in Formula 1 of the urethane acrylate is 3 or more.
• examples of initiators having 4 or more active hydrogens include pentaerythritol, dipentaerythritol, sorbitol and sucrose.
• Ring-opening polymerization is carried out using, for example, an alkali catalyst such as potassium hydroxide, a transition metal compound-porphyrin complex catalyst such as a complex obtained by reacting an organoaluminum compound with porphyrin, a double metal cyanide complex catalyst, or a catalyst comprising a phosphazene compound. It can be carried out using a known catalyst such as. Among these catalysts, a double metal cyanide complex (DMC) catalyst is preferred because it yields a polyether polyol with a narrow molecular weight distribution.
• DMC double metal cyanide complex
• a known compound can be used as the double metal cyanide complex, and examples thereof include a zinc hexacyanocobaltate complex with tert-butanol as a ligand.
• polyether polyols by ring-opening polymerization using a DMC catalyst can be carried out by known methods, for example, WO 2003/062301, WO 2004/067633, and JP 2004-269776.
• the production methods described in JP-A-2005-15786, WO-A-2013/065802, and JP-A-2015-10162 can be applied.
• polyester polyol those obtained by a known production method such as polycondensation of a polyol containing a trifunctional or higher polyol and a dibasic acid can be used. Moreover, a commercial item can also be used.
• dibasic acids examples include aliphatic dibasic acids such as succinic acid, adipic acid, maleic acid and fumaric acid; alicyclic dibasic acids such as 1,4-cyclohexanedicarboxylic acid; phthalic acid, isophthalic acid and terephthalic acid.
• Aromatic dibasic acids such as acids and acid anhydrides thereof can be mentioned.
• Dibasic acids may be used singly or in combination of two or more.
• trifunctional or higher polyols include, for example, glycerin, trimethylolethane, trimethylolpropane, 1,2,6-hexanetriol, pentaerythritol, diglycerin, dipentaerythritol, Sorbitol, sucrose, polyoxyalkylene polyols (polyoxyethylene polyols, polyoxypropylene polyols). Tri- or more functional polyols may be used singly or in combination of two or more.
• the polyol used as a raw material for the polyester polyol may contain glycol, and examples of the glycol include ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, butylene glycol, 1,4-butanediol, and 1,6-hexane. diols, 3-methyl-1,5-pentanediol, triethylene glycol, tripropylene glycol, polyoxyalkylene diols. Glycols used in combination with tri- or more functional polyols may be of one kind alone or of two or more kinds.
• the polyol contains glycol, it is preferably used together with a tetrafunctional or higher polyol so that n in the above formula (1) of the urethane acrylate is 3 or more.
• tetra- or higher functional polyols include pentaerythritol, dipentaerythritol, sorbitol and sucrose.
• Polycarbonate polyols for example, those obtained by known production methods described in JP-A-2021-59722, such as polycondensation of a polyol containing a trifunctional or higher polyol, and a carbonate compound can be used. Moreover, a commercial item can also be used.
• polyols used in the production of polycarbonate polyols include those similar to the polyols used in the production of polyester polyols described above.
• Tri- or more functional polyols may be used singly or in combination of two or more.
• Glycols used in combination with tri- or more functional polyols may be of one kind alone or of two or more kinds.
• carbonate compounds include dimethyl carbonate, diethyl carbonate, dipropyl carbonate, dibutyl carbonate, diphenyl carbonate, ethylene carbonate, trimethylene carbonate, propylene carbonate, 1,2-butylene carbonate, and neopentylene carbonate.
• the carbonate compound may be used singly or in combination of two or more.
• each of n R 2 is independently a residue obtained by removing an isocyanate group from a monoisocyanate having one or more (meth)acryloyloxy groups in one molecule.
• R 2 and R 3 may be the same or different. From the viewpoint of efficient synthesis of urethane (meth)acrylate, R 2 and R 3 are preferably the same.
• the monoisocyanate having a (meth)acryloyloxy group is preferably a compound in which one or more (meth)acryloyloxy groups are bonded to a hydrocarbon skeleton having an isocyanate group.
• the number of (meth)acryloyloxy groups may be one or two or more.
• the hydrocarbon skeleton is preferably an aliphatic hydrocarbon group or an alicyclic hydrocarbon group.
• the number of carbon atoms in the aliphatic hydrocarbon group or alicyclic hydrocarbon group is preferably 8 or less, more preferably 2-6, still more preferably 2-4.
• Examples of monoisocyanates having a (meth) acryloyloxy group include compounds having one (meth) acryloyloxy group such as isocyanate methyl (meth) acrylate and 2-isocyanate ethyl (meth) acrylate; 1,1-(bis Compounds having two (meth)acryloyloxy groups such as (meth)acryloyloxymethyl)ethylisocyanate and 1,1-(bis(meth)acryloyloxymethyl)propylisocyanate can be mentioned.
• AOI (2-isocyanatoethyl acrylate
• Karenzu MOI (2-isocyanatoethyl methacrylate
• Karenzu BEI (1,1-(bis acryloyloxymethyl)ethyl isocyanate) (manufactured by Showa Denko KK).
• the urethane (meth)acrylate has an Mn of 7,500 to 60,000, preferably 8,000 to 55,000, and more preferably 8,500 to 50,000. When the Mn is within the above range, the cured product of the urethane (meth)acrylate has high tensile strength, excellent toughness and shape recovery property when bent, and excellent shape retention.
• Mw/Mn is preferably 1.0 to 1.4, more preferably 1.02 to 1.38, still more preferably 1.05 to 1.25.
• Mw/Mn is an index representing the degree of dispersion (breadth) of the molecular weight distribution, where 1 indicates monodispersity, and the closer to 1, the narrower the molecular weight distribution. If the molecular weight distribution is within the above range, the urethane (meth)acrylate has 3 or more (meth)acryloyloxy groups in one molecule, and even if the Mn is a high molecular weight of 7500 or more, the viscosity is It is relatively low, and is easy to handle during operations such as mixing a curable composition using it. In addition, the cured product of the urethane (meth)acrylate has small residual strain, easily forms a uniform crosslinked network, has high tensile strength, is excellent in toughness and shape recovery upon bending, and is excellent in shape retention. .
• urethane (meth)acrylate is liquid at room temperature (25°C) and has a viscosity at 25°C of preferably 50 Pa ⁇ s or less, more preferably 40 Pa ⁇ s or less, and even more preferably 30 Pa ⁇ s. s or less.
• urethane (meth)acrylate of the present invention is obtained as a reaction product of a urethanization reaction between 1 mol part of a polyol having n hydroxyl groups in one molecule and n mol parts of a monoisocyanate. That is, urethane (meth)acrylate is a reaction product of a polyol having n hydroxyl groups in one molecule derived from R 1 in formula (1) and a monoisocyanate derived from R 2 .
• the hydroxyl value-equivalent molecular weight of the polyol is preferably 7,500 or more, more preferably 8,000 to 60,000, and still more preferably 8,500 to 55,000 from the viewpoint of ensuring that the Mn of the urethane (meth)acrylate is within the above range.
• the urethanization reaction can be carried out by a known method, usually by mixing a polyol and a monoisocyanate and using a urethanization catalyst in an atmosphere of nitrogen gas or inert gas.
• urethanization catalysts include organic tin compounds such as dibutyltin dilaurate, dioctyltin dilaurate, dibutyltin dioctoate, and tin 2-ethylhexanoate; iron compounds such as iron acetylacetonate and ferric chloride; and 2-ethylhexane.
• lead compounds such as acid lead; bismuth compounds such as bismuth 2-ethylhexanoate; and tertiary amines such as triethylamine and triethylenediamine.
• bismuth compounds such as bismuth 2-ethylhexanoate
• tertiary amines such as triethylamine and triethylenediamine.
• organic tin compounds, lead 2-ethylhexanoate, and bismuth 2-ethylhexanoate are preferred.
• the urethanization catalyst may be used alone or in combination of two or more.
• the amount of the urethanization catalyst used is preferably 0.001 to 1 part by mass, more preferably 0.002 to 0.5 part by mass, and still more preferably 0.005 to 1 part by mass with respect to 100 parts by mass of the polyol that is the reactant. It is 0.1 part by mass.
• the reaction temperature for the urethanization reaction is preferably 20 to 100°C, more preferably 30 to 90°C, still more preferably 40 to 80°C.
• the curable composition of the invention contains the urethane (meth)acrylate of the invention described above.
• a polymerization initiator and, if necessary, other components are preferably blended into the curable composition.
• the content of urethane (meth)acrylate in the curable composition is preferably 50% by mass or more, more preferably 70% by mass or more and less than 100% by mass, still more preferably 80% by mass, from the viewpoint of obtaining a cured product having excellent toughness. It is more than mass % and less than 100 mass %.
• Each compounding component in the curable composition is preferably uniformly mixed, for example, using a known mixing device such as a rotation-revolution stirring deaerator, a homogenizer, a planetary mixer, a three-roll mill, and a bead mill. Mixable. Each compounding component may be mixed at the same time or may be mixed by successive addition.
• the polymerization initiator is preferably a radical polymerization initiator, and may be a photopolymerization initiator or a thermal polymerization initiator, and known ones can be used. From the viewpoint of ease of control of the polymerization reaction, the photopolymerization initiator is preferably one that can be used by ultraviolet irradiation with a wavelength of 380 nm or less, and the thermal polymerization initiator can be used by heating within the range of 50 to 120 ° C. things are preferred.
• photopolymerization initiators include 1-hydroxycyclohexylphenyl ketone, 2-hydroxy-2-methylpropiophenone, diethoxyacetophenone, 1-(4-isopropylphenyl)-2-hydroxy-2-methylpropanone, 1-(4-dodecylphenyl)-2-hydroxy-2-methylpropanone, 4-(2-hydroxyethoxy)-phenyl(2-hydroxy-2-propyl)ketone, 2-methyl-1-[4-( methylthio)phenyl]-2-morpholinopropanone, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin-n-butyl ether, benzoin phenyl ether, benzyl dimethyl ketal, benzophenone, benzoylbenzoic acid, methyl benzoylbenzoate, 4-phenylbenzophenone-4-methoxybenzophenone, thioxanth
• thermal polymerization initiators include azo compounds; organic peroxides such as hydroperoxides, dialkyl peroxides, peroxyesters, diacyl peroxides, peroxydicarbonates, peroxyketals, and ketone peroxides.
• azobisisobutyronitrile benzoyl peroxide, tert-butylperoxy-2-ethylhexanoate, 2,5-dimethyl-2,5-di(2-ethylhexanoyl)peroxyhexane , tert-butyl peroxybenzoate, tert-butyl peroxide, cumene hydroperoxide, dicumyl peroxide, di-t-butyl peroxide, 2,5-dimethyl-2,5-dibutylperoxyhexane, 2,4 -dichlorobenzoyl peroxide, 1,4-di(2-t-butylperoxyisopropyl)benzene, 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane, methyl ethyl ketone peroxide, 1 , 1,3,3-tetramethylbutyl peroxy-2-ethylhex
• the content of the polymerization initiator in the curable composition is preferably 0.001 to 20 parts by mass, more preferably 0.01, per 100 parts by mass of urethane (meth)acrylate, from the viewpoint of a suitable polymerization rate. to 10 parts by mass, more preferably 0.1 to 7 parts by mass.
• the light source can be appropriately set according to the light absorption ability of the photopolymerization initiator to be blended.
• the integrated amount of light is, for example, approximately 0.01 to 50 J/cm 2 . From the viewpoint of further stabilizing the physical properties of the cured product, heat treatment may be further performed after the light irradiation.
• the heating temperature is about 40 to 200° C.
• the heating time is about 1 minute to 15 hours.
• the physical properties of the cured product can also be stabilized by allowing it to stand at room temperature (about 15 to 25° C.) for about 1 to 48 hours.
• the heating temperature is usually about 40 to 250°C, and the heating time is about 5 minutes to 24 hours.
• the heating time is shortened when the heating temperature is high, and the heating time is lengthened when the heating temperature is low.
• the curable composition may contain other components in addition to the urethane (meth)acrylate and the polymerization initiator, depending on the ease of handling and its intended use.
• Other components include, for example, monomer components other than the urethane (meth)acrylate of the present invention, catalysts, coloring agents such as pigments and dyes, silane coupling agents, tackifying resins, antioxidants, light stabilizers, agents, metal deactivators, rust inhibitors, anti-aging agents, moisture absorbers, anti-hydrolysis agents, anti-foaming agents, and fillers. It may also contain a solvent.
• These other components in the curable composition may be blended within a range that does not impair the effects of the present invention.
• the other monomer component is a compound that can be copolymerized with the urethane (meth)acrylate.
• (meth)acrylates such as acrylates and amino group-containing (meth)acrylates.
• Other monomer components may be used singly or in combination of two or more.
• the curable composition containing the urethane (meth)acrylate of the present invention is, for example, a coating agent for various substrates, especially a coating for surface protection for preventing scratches and cracks such as displays and touch panels of image display devices. It is suitable for uses such as agents.
• the cured product of the curable composition has a large tensile strength, excellent toughness and shape recovery when bent, and excellent shape retention, so that it can be used for surface protection of flexible displays, foldable devices, etc. It is suitable as a coating agent for
• the cured product of the present invention is obtained by curing the curable composition containing the urethane (meth)acrylate described above, and has high tensile strength and storage shear modulus, low residual strain, toughness and shape when bent. It has excellent recoverability and excellent shape retention. Therefore, according to the present invention, since these properties are exhibited in the above applications, a coated article provided with the cured product of the present invention, particularly a flexible display having a surface coated with the cured product of the present invention and foldable devices can be preferably provided.
• Isophorone diisocyanate “Desmodur (registered trademark) I”, manufactured by Sumika Covestro Urethane Co., Ltd. ⁇ 2- Hydroxyethyl acrylate; manufactured by Tokyo Chemical Industry Co., Ltd.
• Detector Differential refractive index (RI) detector
• Eluent tetrahydrofuran
• Flow rate 0.8 mL/min
• Sample concentration 0.5% by mass
• Sample injection volume 100 ⁇ L
• Sample injection volume 100 ⁇ L
• Sample injection volume 100 ⁇ L
• Sample injection volume 100 ⁇ L
• Sample injection volume 100 ⁇ L
• the isocyanate group (NCO) content was quantified by back titration using an indicator titration method in accordance with JIS K 1603-1:2007 Method A.
• Synthesis Example 3 In Synthesis Example 2, the amount of PO input was 41120 g, and polyol (3) (polyoxypropylene hexaol: hydroxyl value 8.5 mg KOH / g, hydroxyl value equivalent molecular weight 39600) was added in the same manner as in Synthesis Example 2. Obtained.
• Production Example 8 In Production Example 7, polyol (8) was used in place of polyol (7), and urethane acrylate (8) was obtained in the same manner as in Production Example 7 (polyol (8)/isophorodine diisocyanate/2 - Formulation molar ratio of hydroxyethyl acrylate 1/3/3).
• curable composition and its cured product [Production of curable composition and its cured product] (Examples 1-8) Using each of the urethane acrylates (1) to (8) obtained in Production Examples 1 to 8, curable compositions and cured products thereof were produced, and the following items were measured and evaluated.
• a curable composition was prepared by mixing 100 parts by mass of urethane acrylate with 0.3 parts by mass of a photopolymerization initiator. Table 1 shows the measurement evaluation results. Examples 1-4 are working examples, and examples 5-8 are comparative examples.
• the curable composition was applied using an applicator to the release surface of a PET film that had been subjected to silicone release treatment so as to have a thickness of about 100 ⁇ m. Then, in a nitrogen gas atmosphere, it was cured with a conveyor-type UV irradiation machine (manufactured by Oak Manufacturing Co., Ltd.; mercury xenon lamp, illuminance 100 mW/cm 2 , integrated light intensity 3 J/cm 2 ) to prepare a specimen for a tensile test. .
• a conveyor-type UV irradiation machine manufactured by Oak Manufacturing Co., Ltd.; mercury xenon lamp, illuminance 100 mW/cm 2 , integrated light intensity 3 J/cm 2
• a tensile tester (Tensilon universal testing machine "RTG-1310", manufactured by A&D Co., Ltd.; tensile speed 300 mm / min) was used to perform a tensile test on the specimen, and tensile breakage was performed. The strength (tensile strength) was measured. The evaluation is shown in Table 1, with "A” when the tensile strength is 1.0 MPa or more, and "B” when the tensile strength is less than 1.0 MPa.
• the curable composition was sandwiched between a soda-lime glass stage and a measurement spindle (“Disposable plate D-PP20/AL/S07”, manufactured by Anton Paar) with a width of 0.2 mm.
• a mercury-xenon lamp (“Spot Cure (registered trademark) SP-9”, manufactured by Ushio Inc.; illuminance 100 mW/cm 2 ) installed at the bottom of the stage. Then, a cured product sample of the curable composition was obtained.
• the position of the spindle was automatically adjusted so as not to generate stress in the normal direction of the spindle.
• the storage shear modulus of the cured product sample was measured with a rheometer ("Physica MCR301", manufactured by Anton Paar; dynamic shear strain of 1% was applied) while irradiating with ultraviolet rays. It can be said that the higher the storage shear modulus, the tougher the cured product and the better the shape retention.
• the evaluation is shown in Table 1, with "A” when the storage shear modulus of the cured product is 500 kPa or more, and "B" when the storage shear modulus is less than 500 kPa.
• the urethane acrylates of the present invention had low viscosity and good workability during handling.
• the cured product of the curable composition containing the urethane acrylate of the present invention has a large tensile strength and storage shear modulus, and a small residual strain. It can be said that the properties and shape retention are excellent.

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• 2022
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