Classifications

• • 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
  • C08F290/08—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 side groups
  • C08F290/12—Polymers provided for in subclasses C08C or C08F
• • 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
  • C08F222/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides, or nitriles thereof
  • C08F222/10—Esters
• • 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
  • C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
  • C09D133/04—Homopolymers or copolymers of esters
  • C09D133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
• • 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
  • 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
  • C09D4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09D159/00 - C09D187/00

Definitions

• the present invention relates to a photocurable resin composition suitably used for forming a hard coat layer and a cured film thereof.
• information terminal devices such as mobile phones, personal digital assistants (PDAs), portable game machines, digital cameras, personal computers, and televisions are known.
• PDAs personal digital assistants
• a touch panel is mounted on the front surface of the display panel.
• the touch panel can input necessary information such as data information to the information terminal device by pressing the surface panel with a finger or a pen.
• Touch panel classifications include optical, ultrasonic, capacitive, and resistive film systems.
• a laminated film having a transparent base material and a transparent conductive layer having a pattern shape such as a stripe shape disposed on the transparent base material is used.
• a hard coat layer is formed by applying a coating agent on the surface of the transparent substrate, and a transparent conductive layer is disposed on the hard coat layer.
• a transparent conductive layer is disposed on the hard coat layer via an adhesive layer. According to the hard coat layer, scratch resistance can be imparted to the surface of the transparent substrate.
• Such a hard coat layer is required to have high transparency in order to ensure the visibility of the touch panel.
• Patent Document 1 A photocurable hydrophilic coating agent containing a resin component containing 55 to 95% by mass of a photopolymerizable polyfunctional compound having a polymerizable group is disclosed.
• Patent Document 2 a reaction obtained by adding a carboxyl group-containing (meth) acrylic compound (a2) to a polymer obtained by polymerizing a polymerization component (a1) containing a vinyl compound having an epoxy group in the molecule.
• a mold resin composition is disclosed.
• Patent Document 3 discloses an optical sheet that has a functional layer on at least one surface of a transparent substrate, and the functional layer is made by dispersing translucent inorganic particles and / or translucent organic particles in a transparent resin. ing.
• the hard coat layer formed using the photocurable hydrophilic coating agent of Patent Document 1 has low blocking resistance. Therefore, when the transparent base material which has a hard-coat layer is wound up in roll shape or stored, it will become difficult for the transparent base materials to adhere and peel.
• the active energy ray-curable resin composition of Patent Document 2 contains colloidal silica as inorganic particles. Concavities and convexities are formed by inorganic particles on the surface of the hard coat layer formed using the active energy ray-curable resin composition, thereby imparting blocking resistance to the hard coat layer.
• the use of only inorganic particles can not only sufficiently improve the blocking resistance of the hard coat layer, but also lowers the transparency of the hard coat layer.
• irregularities are formed on the surface of the functional layer by translucent inorganic particles and / or translucent organic particles.
• such irregularities are formed in order to impart antiglare properties to the optical sheet.
• translucent inorganic particles and translucent organic particles having a large particle diameter are used. Use of such translucent inorganic particles and translucent organic particles reduces the transparency of the functional layer.
• the formation of the transparent conductive layer or the adhesive layer on the hard coat layer can be performed by, for example, applying an ink such as a composition containing a conductive paste or an adhesive to the hard coat layer.
• an ink such as a composition containing a conductive paste or an adhesive
• the hard coat layer repels the ink. Therefore, ink cannot be printed with high accuracy, and a transparent conductive layer or adhesive layer having a desired pattern shape or uniform thickness cannot be formed on the hard coat layer. Therefore, it is also necessary to improve the printability of the hard coat layer.
• an object of the present invention is to provide a photocurable resin composition capable of forming a hard coat layer that has improved blocking resistance without lowering transparency and also has excellent printability. Is to provide.
• the photocurable resin composition of the present invention is The hydroxyl value is 10 to 350 mg KOH / g, the (meth) acryl equivalent is 100 to 800 g / eq, the weight average molecular weight is 10,000 to 200,000, and the glass transition point is 50 to 110 ° C.
• the (meth) acrylic polymer (A) preferably contains 10 to 90% by weight of an alkyl (meth) acrylate component.
• the inorganic particles (B) are preferably at least one of metal particles and metal oxide particles.
• the organic particles (C) are preferably (meth) acrylic resin particles.
• the photocurable resin composition preferably contains a photopolymerization initiator.
• the cured film of the present invention is characterized by curing the photocurable resin composition.
• the photocurable resin composition of the present invention it is possible to form a hard coat layer having improved blocking resistance without lowering transparency and also having excellent printability.
• the photocurable resin composition of the present invention has a (meth) acrylic polymer (A), an inorganic particle (B), an organic particle (C), and one molecule having a photopolymerizable group and a hydroxyl group in the side chain.
• a photopolymerizable polyfunctional compound (D) having two or more photopolymerizable groups is contained therein.
• the photocurable resin composition of the present invention contains at least one (meth) acrylic polymer (A) having a photopolymerizable group and a hydroxyl group in the side chain.
• the (meth) acrylic polymer (A) can be radically polymerized with a photopolymerizable polyfunctional compound (D) and a photopolymerizable group to form a crosslinked structure. Thereby, a hard coat layer having high hardness and excellent scratch resistance can be formed.
• the (meth) acrylic polymer (A) may have at least one photopolymerizable group and a hydroxyl group in the side chain, but the (meth) acrylic polymer (A) is photopolymerizable in the side chain. It is preferable that each group has two or more hydroxyl groups.
• (meth) acryl means acryl or methacryl.
• the photopolymerizable group of the (meth) acrylic polymer (A) has an ethylenically unsaturated double bond capable of radical polymerization with the photopolymerizable group of the photopolymerizable polyfunctional compound (D) described later.
• the photopolymerizable group include an acryloyl group, a methacryloyl group, a styryl group, a vinyl group, and an allyl group, and an acryloyl group and a methacryloyl group are preferable.
• Preferred examples of the (meth) acrylic polymer (A) include the following (meth) acrylic polymers (A1) to (A3).
• a polymer having a glycidyl group obtained by radical polymerization of a monomer composition (I) containing a radically polymerizable monomer having a glycidyl group and, if necessary, an alkyl (meth) acrylate having no glycidyl group.
• the (meth) acrylic polymers (A1) to (A3) can be produced, for example, by the following methods (1) to (3).
• a method comprising the steps of: (2) Radical polymerization of a radical polymerizable monomer having a hydroxyl group and, if necessary, a monomer composition (II) containing an alkyl (meth) acrylate having no hydroxyl group in the presence of a radical polymerization initiator.
• a specific example of the production method (1) of the (meth) acrylic polymer (A1) will be described below.
• a polymer (I ′) having a glycidyl group is produced.
• a compound having a carboxyl group and a photopolymerizable group and, if necessary, a catalyst are added to the reaction vessel.
• a polymerization inhibitor such as p-methoxyphenol or hydroquinone (HQ) may be added to the reaction vessel. Thereafter, while allowing oxygen to be blown into the reaction vessel as necessary, for example, by allowing the reaction solution to react at 30 to 150 ° C. for 6 to 12 hours, photopolymerization is performed on the side chain.
• a (meth) acrylic polymer (A1) having a functional group and a hydroxyl group can be produced.
• radical polymerizable monomer having a glycidyl group examples include glycidyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate glycidyl ether, and allyl glycidyl ether, with glycidyl (meth) acrylate being preferred.
• the radically polymerizable monomer which has a glycidyl group may be used independently, or 2 or more types may be used together.
• (meth) acrylate means an acrylate or a methacrylate.
• the content of the radically polymerizable monomer having a glycidyl group in the monomer composition (I) is preferably 10 to 90% by weight, more preferably 20 to 80% by weight.
• the content of the radical polymerizable monomer having a glycidyl group is preferably 10 to 90% by weight, more preferably 20 to 80% by weight.
• the monomer composition (I) preferably contains an alkyl (meth) acrylate having no glycidyl group.
• the alkyl (meth) acrylate having no glycidyl group preferably has no hydroxyl group.
• Such alkyl (meth) acrylates include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, pentyl (meth) acrylate, hexyl (meth) acrylate, heptyl (meth) ) Acrylate, octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, nonyl (meth) acrylate, decyl (meth) acrylate, benzyl (meth) acrylate, dicyclopentadienyl (meth) acrylate, etc.
• methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, and butyl (meth) acrylate are preferable, and methyl (meth) acrylate is more preferable.
• alkyl (meth) acrylate may be used independently or 2 or more types may be used together.
• the content of the alkyl (meth) acrylate having no glycidyl group in the monomer composition (I) is preferably 10 to 90% by weight, more preferably 20 to 80% by weight.
• content of the alkyl (meth) acrylate which does not have a glycidyl group more than the said lower limit, gelatinization at the time of the synthesis
• combination of a (meth) acrylic-type polymer can be suppressed.
• a hard coat layer having a high crosslink density and excellent hardness can be formed.
• the monomer composition (I) may contain an alkyl (meth) acrylate having a hydroxyl group.
• an alkyl (meth) acrylate having a hydroxyl group By using an alkyl (meth) acrylate having a hydroxyl group, the hydroxyl value of the (meth) acrylic polymer (A1) can be adjusted.
• alkyl (meth) acrylate having a hydroxyl group examples include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 4 -Hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, 8-hydroxyoctyl (meth) acrylate, 10-hydroxydecyl (meth) acrylate, 12-hydroxylauryl (meth) acrylate and the like.
• 2-hydroxyethyl (meth) acrylate is preferable.
• the alkyl (meth) acrylate which has a hydroxyl group may be used independently, or 2 or more types may be used together.
• the content of the alkyl (meth) acrylate having a hydroxyl group in the monomer composition (I) is preferably 80% by weight or less, and more preferably 60% by weight or less.
• the monomer composition (I) may contain a (meth) acrylate having an alicyclic group.
• the (meth) acrylate having an alicyclic group include cyclohexyl (meth) acrylate, 4-butylcyclohexyl (meth) acrylate, dicyclopentanyl (meth) acrylate, dicyclopentenyl (meth) acrylate, and dicyclopenta Examples include dienyl (meth) acrylate, isobornyl (meth) acrylate, and tricyclodecanyl (meth) acrylate.
• the content of the (meth) acrylate having an alicyclic group in the monomer composition (I) is preferably 80% by weight or less, and more preferably 60% by weight or less.
• a compound having a carboxyl group and a photopolymerizable group is added to the polymer (I ′) having a glycidyl group.
• the compound having a carboxyl group and a photopolymerizable group include an ethylenically unsaturated carboxylic acid or an anhydride thereof. Specific examples include acrylic acid, methacrylic acid, ⁇ -carboxy-polycaprolactone monoacrylate, monohydroxyethyl acrylate phthalate and the like, and acrylic acid and methacrylic acid are preferable.
• the compound which has a carboxyl group and a photopolymerizable group may be used independently, or 2 or more types may be used together.
• the carboxyl group possessed by these compounds reacts with the glycidyl group possessed by the polymer (I ′) to form an ester bond and generate a new hydroxyl group.
• the photopolymerizable group can be introduced.
• the (meth) acrylic-type polymer (A1) which has a photopolymerizable group and a hydroxyl group in a side chain is obtained.
• the glycidyl group in the radical polymerizable monomer having a glycidyl group used for the production of the polymer (I ′) is preferably 0.3 to 1.5, preferably 0.5 to 1.2. Is more preferable, and 1.0 is particularly preferable.
• the molar ratio is too low, the number of side chain photopolymerizable groups decreases, which may reduce the hardness of the hard coat layer. If the molar ratio is too high, unreacted acid remains, and the water resistance of the hard coat layer may be lowered. Further, as described above, the glycidyl group reacts with the carboxyl group to form an ester bond and generate a hydroxyl group. Therefore, the hydroxyl value of the (meth) acrylic polymer (A1) can be adjusted by adjusting the molar ratio.
• a polymerization inhibitor such as p-methoxyphenol or hydroquinone (HQ) may be added to the reaction vessel. Thereafter, while allowing oxygen to be blown into the reaction vessel as necessary, for example, by allowing the reaction solution to react at 30 to 150 ° C. for 6 to 12 hours, photopolymerization is performed on the side chain.
• a (meth) acrylic polymer (A2) having a functional group and a hydroxyl group can be produced.
• radical polymerizable monomer having a hydroxyl group examples include alkyl (meth) acrylate having a hydroxyl group, acrylic acid N-hydroxymethylamide, methacrylic acid N-hydroxymethylamide, 4-hydroxymethylcyclohexyl (meth) acrylate, and the like.
• An alkyl (meth) acrylate having an alkyl group is preferred, and an alkyl (meth) acrylate having a hydroxyl group in the alkyl group is more preferred.
• alkyl (meth) acrylate having a hydroxyl group examples include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 4 -Hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, 8-hydroxyoctyl (meth) acrylate, 10-hydroxydecyl (meth) acrylate, 12-hydroxylauryl (meth) acrylate and the like.
• the radically polymerizable monomer which has a hydroxyl group may be used independently, or 2 or more types may be used together.
• radical polymerizable monomer having a hydroxyl group 2-hydroxyethyl (meth) acrylate is preferable, and 2-hydroxyethyl methacrylate (2-HEMA) is more preferable.
• 2-hydroxyethyl (meth) acrylate is preferable, and 2-hydroxyethyl methacrylate (2-HEMA) is more preferable.
• the content of the radically polymerizable monomer having a hydroxyl group in the monomer composition (II) is preferably 10 to 90% by weight, more preferably 20 to 80% by weight.
• a hard coat layer having a high crosslinking density and excellent hardness can be formed.
• the inorganic particles (B) and the organic particles (C) are highly dispersed, and thereby the transparency and printability of the hard coat layer. Can also be improved.
• the content of the radical polymerizable monomer having a hydroxyl group is set to the upper limit value or less, it is possible to suppress a decrease in the transparency of the hard coat layer due to aggregation of the inorganic particles (B) and the organic particles (C). .
• the monomer composition (II) preferably further contains an alkyl (meth) acrylate having no hydroxyl group.
• alkyl (meth) acrylate not having a hydroxyl group include the same alkyl (meth) acrylates having no glycidyl group in the method (1) described above. Of these, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, and butyl (meth) acrylate are preferable.
• the content of the alkyl (meth) acrylate having no hydroxyl group in the monomer composition (II) is preferably 10 to 90% by weight, more preferably 20 to 80% by weight.
• the inorganic particles (B) and the organic particles (C) are highly dispersed by setting the content of the alkyl (meth) acrylate having no hydroxyl group to the upper limit value or less, and the transparency of the hard coat layer can be increased. Printability can be improved. Further, by setting the content of alkyl (meth) acrylate having no hydroxyl group to the upper limit value or less, a hard coat layer having a high crosslinking density and excellent hardness can be formed.
• the monomer composition (II) may contain a (meth) acrylate having an alicyclic group.
• Specific examples of the (meth) acrylate having an alicyclic group include those similar to the (meth) acrylate having an alicyclic group in the method (1) described above.
• the content of the (meth) acrylate having an alicyclic group in the monomer composition (II) is preferably 80% by weight or less, and more preferably 60% by weight or less.
• a compound having an isocyanate group and a photopolymerizable group is added to the polymer (II ′).
• a compound having an isocyanate group and a photopolymerizable group is added to a part of the hydroxyl group of the polymer (II ′).
• the side chain has a hydroxyl group and a photopolymerizable group (meth)
• An acrylic polymer (A2) is obtained.
• Examples of the compound having an isocyanate group and a photopolymerizable group include 2-isocyanatoethyl methacrylate (for example, trade name “Karenz MOI” manufactured by Showa Denko KK), 1,1- (bisacryloyloxymethyl) Ethyl isocyanate (for example, trade name “Karenz BEI” manufactured by Showa Denko KK), 2-isocyanatoethyl acrylate (for example, trade name “Karenz AOI” manufactured by Showa Denko KK), (Meta) Examples thereof include (meth) acryloyl isocyanate in which an acryloyl group is bonded to an isocyanate group via an alkylene group having 2 to 6 carbon atoms, and derivatives thereof. Examples of (meth) acryloyl isocyanate include 2-methacryloyloxyethyl isocyanate.
• Examples of the derivative include (meth) acrylate having an isocyanate group masked with a blocking agent.
• Specific examples include 2- (O- [1′-methylpropylideneamino] carboxyamino) ethyl methacrylate (for example, trade name “Karenz MOI-BM” manufactured by Showa Denko KK), 2-[( 3,5-dimethylpyrazolyl) carbonylamino] ethyl methacrylate (for example, trade name “Karenz MOI-BP” manufactured by Showa Denko KK) and the like.
• the compound which has an isocyanate group and a photopolymerizable group may be used independently, or 2 or more types may be used together. Of these, 2-isocyanatoethyl methacrylate is preferable.
• the hydroxyl group (—OH) in the radical polymerizable monomer having a hydroxyl group used in the production of the polymer (II ′) is used.
• the ratio of the number of moles of isocyanate groups (—NCO) to the number of moles (—NCO / —OH) is preferably 0.05 to 0.9, more preferably 0.1 to 0.9.
• the hydroxyl value of the (meth) acrylic polymer (A2) can also be adjusted by adjusting the molar ratio.
• Polymer (III ′) is produced by polymerization.
• a compound having a glycidyl group and a photopolymerizable group and, if necessary, a catalyst are added to the reaction vessel.
• a polymerization inhibitor such as p-methoxyphenol or hydroquinone (HQ) may be added to the reaction vessel.
• a (meth) acrylic polymer (A3) having a functional group and a hydroxyl group can be produced.
• Examples of the radical polymerizable monomer having a carboxyl group used in the method (3) include an ethylenically unsaturated carboxylic acid or an anhydride thereof.
• ⁇ , ⁇ -unsaturated carboxylic acids such as acrylic acid, methacrylic acid, itaconic acid, maleic acid, fumaric acid or salts thereof; ⁇ -carboxy-polycaprolactone monoacrylate, phthalic acid monohydroxyethyl acrylate, etc.
• Acrylic acid and methacrylic acid are preferred.
• the radically polymerizable monomer which has a carboxyl group may be used independently, or 2 or more types may be used together.
• the content of the radical polymerizable monomer having a carboxyl group in the monomer composition (III) is preferably 10 to 90% by weight, more preferably 20 to 80% by weight.
• a hard coat layer having a high crosslinking density and excellent hardness can be formed.
• combination of a (meth) acrylic-type polymer can be suppressed by making content of the radically polymerizable monomer which has a carboxyl group below into the said upper limit.
• the monomer composition (III) preferably further contains an alkyl (meth) acrylate having no carboxyl group.
• alkyl (meth) acrylate having no carboxyl group include the same alkyl (meth) acrylates having no glycidyl group in the above-described method (1).
• the content of the alkyl (meth) acrylate having no carboxyl group in the monomer composition (III) is preferably 10 to 90% by weight, more preferably 20 to 80% by weight.
• the monomer composition (III) may contain an acrylic (meth) acrylate having a hydroxyl group.
• Specific examples of the acrylic (meth) acrylate having a hydroxyl group include those similar to the alkyl (meth) acrylate having a hydroxyl group in the method (1) described above.
• the hydroxyl value of the (meth) acrylic polymer (A3) can be adjusted.
• the content of the alkyl (meth) acrylate having a hydroxyl group in the monomer composition (III) is preferably 90% by weight or less, more preferably 80% by weight or less, particularly preferably 10 to 90% by weight, and 20 to 80% by weight. Is most preferred.
• the inorganic particles (B) and the organic particles (C) are highly dispersed to improve the transparency and printability of the hard coat layer. be able to.
• the content of the alkyl (meth) acrylate having a hydroxyl group is equal to or lower than the above upper limit value, it is possible to suppress a decrease in transparency of the hard coat layer due to aggregation of the inorganic particles (B) and the organic particles (C). it can.
• the monomer composition (III) may contain a (meth) acrylate having an alicyclic group.
• Specific examples of the (meth) acrylate having an alicyclic group include those similar to the (meth) acrylate having an alicyclic group in the method (1) described above.
• the content of the (meth) acrylate having an alicyclic group in the monomer composition (III) is preferably 80% by weight or less, and more preferably 60% by weight or less.
• a compound having a glycidyl group and a photopolymerizable group is added to the polymer (III ′).
• the carboxyl group possessed by the polymer (III ′) reacts with the glycidyl group possessed by the compound, thereby forming an ester bond and generating a new hydroxyl group.
• the photopolymerizable group can be introduced.
• a (meth) acrylic polymer (A3) having a photopolymerizable group such as a vinyl group and a hydroxyl group in the side chain is obtained.
• the compound having a glycidyl group and a photopolymerizable group examples include glycidyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate glycidyl ether, and allyl glycidyl ether. preferable.
• the compound which has a glycidyl group and a photopolymerizable group may be used independently, or 2 or more types may be used together.
• the carboxyl group in the radical polymerizable monomer having a carboxyl group used for the production of the polymer (III ′) is preferably 0.3 to 1.5, preferably 0.5 to 1.2. Is more preferable, and 1.0 is more preferable.
• the glycidyl group reacts with the carboxyl group to form an ester bond and generate a hydroxyl group. Therefore, the hydroxyl value of the (meth) acrylic polymer (A3) can be adjusted by adjusting the molar ratio.
• the monomer composition (I), (II) or (III) is radically polymerized in the presence of a radical polymerization initiator.
• a radical polymerization initiator those generally used in radical polymerization are used.
• radical polymerization initiators include organic peroxides such as benzoyl peroxide, lauroyl peroxide, caproyl peroxide, t-hexyl peroxyneodecanate, and t-butyl peroxybivalate; 2,2-azobis- Isobutyronitrile, 2,2-azobis-2,4-dimethylvaleronitrile, 2,2-azobis-4-methoxy-2,4-dimethylvaleronitrile, azobis-2-methylbutyronitrile (Nippon Hydrazine Industry ( An azo compound such as a trade name “ABN-E”) manufactured by Co., Ltd. is preferable, and an azo compound is preferable.
• a radical polymerization initiator may be used
• the monomer composition (I), (II) or (III) is polymerized in a solvent.
• the solvent is not particularly limited as long as it is stable with respect to each of the above-mentioned monomers.
• petroleum hydrocarbon solvents such as hexane and mineral spirit; aromatic hydrocarbon solvents such as benzene, toluene and xylene; acetone, Ketone solvents such as methyl ethyl ketone, methyl isobutyl ketone, diisobutyl ketone, cyclohexanone; ester solvents such as methyl acetate, ethyl acetate, butyl acetate, ⁇ -butyrolactone, propylene glycol monomethyl ether acetate; N, N-dimethylformamide, N, N -Aprotic polar solvents such as dimethylacetamide, dimethyl sulfoxide, N-methylpyrrolidone and pyridine.
• a solvent may be used independently and 2 or more types may be used together.
• the mixing ratio of the solvent is not particularly limited and is appropriately set according to the purpose and application.
• a commercial item can also be used for a solvent.
• examples of petroleum hydrocarbon solvents include AF Solvent Nos. 4 to 7 manufactured by Nippon Oil Corporation.
• examples of the aromatic hydrocarbon solvent include Ink Solvent No. 0 manufactured by Nippon Oil Corporation and Solvesso 100, 150, and 200 manufactured by Exxon Chemical.
• a catalyst to each reactor.
• the catalyst include dibutyltin dilaurate, dioctyltin laurate, dioctyltin dilaurate, triphenylphosphine, and a bismuth catalyst.
• the hydroxyl value of the (meth) acrylic polymer (A) is limited to 10 to 350 mgKOH / g, preferably 30 to 330 mgKOH / g, more preferably 50 to 300 mgKOH / g. According to the (meth) acrylic polymer (A) having a hydroxyl value equal to or higher than the above lower limit, excellent printability can be imparted to the hard coat layer. Furthermore, according to the (meth) acrylic polymer (A) having a hydroxyl value within the above range, the inorganic particles (B) and the organic particles (C) can be highly dispersed, whereby the inorganic particles (B) and A decrease in the transparency of the hard coat layer due to the addition of the organic particles (C) can be suppressed. In addition, the hydroxyl value of (meth) acrylic-type polymer (A) can be measured by the method as described in the Example mentioned later.
• the (meth) acrylic equivalent of the (meth) acrylic polymer (A) is limited to 100 to 800 g / eq, preferably 200 to 700 g / eq, more preferably 300 to 600 g / eq. According to the (meth) acrylic polymer (A) whose (meth) acrylic equivalent is not more than the above upper limit value, a hard coat layer having high hardness can be formed. Furthermore, according to the (meth) acrylic polymer (A) having a (meth) acrylic equivalent within the above range, the inorganic particles (B) and the organic particles (C) can be highly dispersed. The decrease in the transparency of the hard coat layer due to the addition of B) or the organic particles (C) can be suppressed.
• the (meth) acrylic equivalent of (meth) acrylic polymer (A) is the (meth) acrylic polymer (A) per mole of (meth) acryloyl group possessed by (meth) acrylic polymer (A). Means the number of grams.
• the (meth) acrylic equivalent of the (meth) acrylic polymer (A) can be calculated from the monomer composition that is the raw material of the (meth) acrylic polymer (A) by the following formula (I).
• the total amount (g) of monomers used as the raw material for the (meth) acrylic polymer (A) is “W”
• the weight average molecular weight of the (meth) acrylic polymer (A) is limited to 10,000 to 200,000, preferably 30,000 to 170,000, more preferably 50,000 to 150,000, 65 150,000 to 150,000 is particularly preferable.
• the (meth) acrylic polymer (A) having a weight average molecular weight within the above range can disperse the inorganic particles (B) and the organic particles (C) highly, and has excellent blocking resistance and transparency.
• a code layer can be formed.
• the weight average molecular weight of the (meth) acrylic polymer (A) can be measured in terms of polystyrene using a gel permeation chromatograph (GPC). Specifically, the measurement of the weight average molecular weight using GPC can be performed as follows. First, the molecular weight distribution of the (meth) acrylic polymer (A) is measured by a gel permeation chromatograph (GPC) equipped with a differential refractive index detector (RID) to obtain a chromatogram (chart). From this chromatogram, the weight average molecular weight of the (meth) acrylic polymer (A) can be calculated using standard polystyrene as a calibration curve. In addition, the weight average molecular weight of a (meth) acrylic-type polymer (A) can be measured by the method as described in the Example mentioned later.
• GPC gel permeation chromatograph
• the glass transition point (Tg) of the (meth) acrylic polymer (A) is limited to 50 to 110 ° C., preferably 55 to 107 ° C., more preferably 60 to 105 ° C. According to the (meth) acrylic polymer (A) having a glass transition point equal to or higher than the above lower limit, a hard coat layer having high hardness and excellent scratch resistance and blocking resistance can be formed. Moreover, according to the (meth) acrylic polymer (A) having a glass transition point within the above range, the inorganic particles (B) and the organic particles (C) can be highly dispersed, and the blocking resistance and transparency can be improved. An excellent hard code layer can be formed. The glass transition point of the (meth) acrylic polymer (A) can be calculated by Fox's equation.
• the (meth) acrylic polymer (A) preferably contains 10 to 90% by weight of an alkyl (meth) acrylate component as a monomer component.
• Such a (meth) acrylic polymer (A) can be obtained by radical polymerization of a monomer composition containing 10 to 90% by weight of alkyl (meth) acrylate.
• the organic particles (C) can be highly dispersed, whereby the transparency of the hard coat layer can be improved.
• the alkyl (meth) acrylate used as the monomer component preferably has no glycidyl group or hydroxyl group.
• Specific examples of the alkyl (meth) acrylate include ethyl (meth) acrylate, methyl (meth) acrylate, n-butyl (meth) acrylate, hexyl acrylate, 2-ethylbutyl (meth) acrylate, isooctyl (meth) acrylate, 2 -Ethylhexyl (meth) acrylate, decyl (meth) acrylate, dodecyl (meth) acrylate and the like.
• methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, and butyl (meth) acrylate are preferable, and methyl (meth) acrylate is more preferable.
• methyl (meth) acrylate not only can the organic particles (C) be highly dispersed, but also a hard coat layer having high hardness can be formed.
• the content of the alkyl (meth) acrylate component in the (meth) acrylic polymer (A) is preferably 10 to 90% by weight, more preferably 20 to 80% by weight, particularly preferably 30 to 80% by weight, 70% by weight is most preferred. That is, the content of the alkyl (meth) acrylate in the monomer composition is preferably 10 to 90% by weight, more preferably 20 to 80% by weight, particularly preferably 30 to 80% by weight, most preferably 40 to 70% by weight. preferable.
• a hard coat layer excellent in transparency and hardness can be formed.
• the content of the (meth) acrylic polymer (A) in the photocurable resin composition is (meth) acrylic polymer (A), inorganic particles (B), organic particles (C), and photopolymerizable multifunctional.
• the amount is limited to 10 to 40% by weight based on the total weight of the compound (D), but is preferably 12 to 37% by weight, and more preferably 15 to 35% by weight.
• an inorganic particle (B) and organic particle (C) can be disperse
• An excellent hard code layer can be formed.
• high hardness of the hard coat layer can be ensured.
• the photocurable resin composition of the present invention contains at least one kind of inorganic particles (B). According to the inorganic particles (B), a hard coat layer having high hardness and excellent scratch resistance and blocking resistance can be formed. Furthermore, polar groups such as hydroxyl groups are often present on the surface of the inorganic particles (B).
• the (meth) acrylic polymer (A) having a predetermined hydroxyl value described above also has a hydroxyl group in the side chain. Therefore, the inorganic particles (B) and the (meth) acrylic polymer (A) are close in polarity to each other, and electrostatic repulsion is suppressed.
• the inorganic particles (B) can be highly dispersed by using the (meth) acrylic polymer (A), thereby suppressing the decrease in the transparency of the hard coat layer due to the addition of the inorganic particles (B).
• the scratch resistance and blocking resistance of the hard coat layer can be improved.
• the said mechanism is guessed by this inventor etc., Therefore, this invention is not limited to the said mechanism.
• Examples of the inorganic particles (B) include metal particles, metal oxide particles, metal sulfate particles, metal silicate particles, metal phosphate particles, metal carbonate particles, metal hydroxide particles, and fluorine compound particles. It is done. Among these, metal particles and metal oxide particles are preferable, and metal oxide particles are more preferable. The metal particles and the metal oxide particles are close in polarity to the (meth) acrylic polymer (A), and thus can be highly dispersed by the (meth) acrylic polymer (A).
• An inorganic particle (B) may be used individually by 1 type, and 2 or more types may be used together.
• Examples of the metal contained in the metal particles include Si, Ti, Mg, Ca, Zr, Sn, Sb, As, Zn, Nb, In, and Al.
• Examples of the metal oxide contained in the metal oxide particles include oxides of metals such as Si, Ti, Mg, Ca, Zr, Sn, Sb, As, Zn, Nb, In, and Al.
• Specific examples of the metal oxide particles include silicon oxide particles, titanium oxide particles, aluminum oxide particles, tin oxide particles, indium oxide particles, ITO particles, zinc oxide particles, zirconium oxide particles, and magnesium oxide particles.
• fine particles of a different element doped metal oxide in which a different element such as Ab, Sn, F, P, Al or the like is doped into these metal oxide particles may be used.
• silicon oxide particles aluminum oxide particles, zirconium oxide particles, and titanium oxide particles are preferable, and silicon oxide particles are more preferable.
• inorganic particles (B) inorganic particles dispersed in a colloidal form can be used.
• the inorganic particles (B) may be surface-treated by a known method.
• the shape of the inorganic particles (B) is not particularly limited, and examples thereof include a lump shape, a spherical shape, a hollow shape, a porous shape, a rod shape, a plate shape, a fiber shape, and an indefinite shape. You may use combining the inorganic particle (B) of a different shape.
• the average particle diameter of the inorganic particles (B) is limited to 10 nm to 500 nm, preferably 10 nm to 400 nm, more preferably 10 nm to 200 nm.
• the inorganic particles (B) having an average particle size of less than the lower limit it is difficult to achieve high dispersion, and the transparency and blocking resistance of the hard coat layer may be reduced.
• the inorganic particle (B) whose average particle diameter exceeds the above upper limit there is a possibility that the transparency, hardness, blocking resistance and printability of the hard coat layer may be lowered.
• the inorganic particles (B) exist as aggregated particles such as primary particles or secondary particles. Therefore, the average particle diameter of the inorganic particles (B) is a value measured by a measurement method described later.
• the measurement of the average particle diameter of an inorganic particle (B) can be performed as follows. First, the photocurable resin composition is diluted with methyl isobutyl ketone to obtain a diluted solution. The concentration of the inorganic particles (B) in the diluted solution is 0.1 to 1% by weight. Next, the volume particle size distribution of the inorganic particles (B) is measured using a diluting solution with a laser light diffraction / scattering particle size distribution measuring device (for example, Nanotrac UPA-EX150 manufactured by Nikkiso Co., Ltd.). The cumulative value of 50% can be calculated as the average particle diameter of the inorganic particles (B). Specific measurement conditions are as shown below.
• the measured value of the average particle diameter of the inorganic particles obtained under the following measurement conditions is defined as the average particle diameter of the inorganic particles (B).
• the content of inorganic particles (B) in the photocurable resin composition is (meth) acrylic polymer (A), inorganic particles (B), organic particles (C), and photopolymerizable polyfunctional compound (D). However, it is preferably 6 to 35% by weight, more preferably 7 to 30% by weight. If the content of the inorganic particles (B) is less than the above lower limit, there is a possibility that excellent blocking resistance cannot be imparted to the hard coat layer. Moreover, when content of an inorganic particle (B) exceeds the said upper limit, there exists a possibility that the transparency and printability of a hard-coat layer may fall. Furthermore, if the content of the inorganic particles (B) exceeds the above upper limit, the hard coat layer may become too hard and cracks may easily occur.
• the photocurable resin composition of the present invention contains at least one kind of organic particles (C).
• the printability of the hard coat layer can be improved by using the inorganic particles (B) and the organic particles (C) in combination in the presence of the (meth) acrylic polymer (A).
• the mechanism for obtaining such an effect is not clear, but can be estimated as follows. In addition, the following mechanism is guessed by this inventor etc., Therefore, this invention is not limited to the following mechanism.
• the inorganic particles (B) can be highly dispersed by the hydroxyl groups of the (meth) acrylic polymer (A), but the presence of the inorganic particles (B) allows the hydroxyl groups of the (meth) acrylic polymer (A) to be dispersed. Many will exist toward the inside of the hard coat layer.
• the organic particles (C) have hydrophobicity, and the hydrophobicity of the organic particles (C) contributes to the dispersion of the inorganic particles (B) among the hydroxyl groups of the (meth) acrylic polymer (A). Unexposed hydroxyl groups can be present toward the outside of the hard coat layer.
• the inorganic particles (B) and the organic particles (C) in combination in the presence of the (meth) acrylic polymer (A) the number of hydroxyl groups existing on the outer surface of the hard coat layer is increased. be able to. Since such a hard coat layer has a large number of hydroxyl groups on the surface thereof, the conformability to ink is improved, thereby enabling printing with high accuracy without repelling the ink.
• Organic particles (C) include particles containing a synthetic resin.
• Synthetic resins include polyamide resins, polyamideimide resins, polyacetal resins, (meth) acrylic resins, melamine resins, (meth) acrylic-styrene copolymers, polycarbonate resins, styrene resins, polyvinyl chloride resins. Examples include resins, benzoguanamine-melamine formaldehyde, silicone resins, fluorine resins, polyester resins, cross-linked (meth) acrylic resins, cross-linked polystyrene resins, cross-linked polyurethane resins, and epoxy resins.
• An organic particle (C) may be used individually by 1 type, and 2 or more types may be used together.
• (meth) acrylic resin particles are preferable, and polyalkyl (meth) acrylate particles are more preferable. Since the (meth) acrylic resin particles have low polarity, many hydroxyl groups of the (meth) acrylic polymer (A) can be present on the hard coat layer surface.
• polyalkyl (meth) acrylate particles polymethyl (meth) acrylate particles, polyethyl (meth) acrylate particles, polypropyl (meth) acrylate particles, polybutyl (meth) acrylate particles, polypentyl (meth) acrylate particles, polyhexyl (meth) Acrylate particles, polyheptyl (meth) acrylate particles, polyoctyl (meth) acrylate particles, poly-2-ethylhexyl (meth) acrylate particles, polynonyl (meth) acrylate particles, polydecyl (meth) acrylate particles, polybenzyl (meth) acrylate particles, And polydicyclopentadienyl (meth) acrylate particles.
• polymethyl (meth) acrylate particles are preferable.
• the average particle diameter of the organic particles (C) is limited to 10 nm to 500 nm, but is preferably 10 nm to 400 nm, and more preferably 50 nm to 300 nm.
• the organic particles (C) having an average particle diameter within the above range are hardly dispersed in the hydroxyl groups of the (meth) acrylic polymer (A) that do not contribute to the dispersion of the inorganic particles (B). It can exist toward the outer side of a coating layer. Thereby, a hard coat layer having many hydroxyl groups on the surface can be formed. Further, the organic particles (C) having an average particle diameter exceeding the above upper limit may reduce the transparency and hardness of the hard coat layer.
• the measurement of the average particle diameter of the organic particles (C) can be performed in the same manner as the method for measuring the average particle diameter of the inorganic particles (B) described above.
• the organic particles (C) are present as aggregated particles such as primary particles or secondary particles. Therefore, let the average particle diameter of organic particle (C) be the value measured by the same method as the measuring method of the average particle diameter of inorganic particle (B) mentioned above.
• the concentration of the organic particles (C) in the diluted solution is 0.1 to 1% by weight.
• the content of the organic particles (C) in the photocurable resin composition is (meth) acrylic polymer (A), inorganic particles (B), organic particles (C), and photopolymerizable polyfunctional compound (D).
• the total weight is limited to 0.5 to 10% by weight, preferably 0.7 to 9% by weight, and more preferably 1 to 8% by weight.
• the photocurable resin composition of the present invention contains at least one photopolymerizable polyfunctional compound (D) having two or more photopolymerizable groups in one molecule.
• the photopolymerizable polyfunctional compound (D) can be radically polymerized with the (meth) acrylic polymer (A).
• the photopolymerizable polyfunctional compound (D) can crosslink between the molecular chains of the (meth) acrylic polymer (A) to form a dense network structure.
• Inorganic particles (B) and organic particles (C) can be taken into such a dense network structure, whereby inorganic particles (B) and organic particles (C) are highly dispersed while suppressing their aggregation.
• a hard coat layer can be formed. Such a hard coat layer is excellent in transparency, blocking resistance, and printability because the inorganic particles (B) and the organic particles (C) are highly dispersed.
• the photopolymerizable group contained in the photopolymerizable polyfunctional compound (D) has an ethylenically unsaturated double bond capable of radical polymerization with the photopolymerizable group of the (meth) acrylic polymer (A).
• an acryloyl group, a methacryloyl group, a styryl group, a vinyl group, an allyl group, etc. are mentioned, and an acrylolyl group and a methacryloyl group are preferable.
• Examples of the photopolymerizable polyfunctional compound (D) having two photopolymerizable groups in one molecule include ethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, and neopentyl glycol di (meth).
• Alkylene glycol di (meth) acrylate such as acrylate; polyalkylene glycol di (meth) acrylate such as diethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, dipropylene glycol di (meth) acrylate, tripropylene glycol di (meth) acrylate (Meth) acrylate; 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, 1,9-nonanediol di (meth) acrylate, dicyclopentadiene di (meth) Acrylate, neopentyl glycol adipate di (meth) acrylate, hydroxypivalic acid neopentyl glycol di (meth) acrylate, tricyclodecane dimethanol di (meth) acrylate, dicyclopentanyl di (meth) acrylate;
• Examples of the photopolymerizable polyfunctional compound (D) having three photopolymerizable groups in one molecule include trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, and dipentaerythritol tri (meta).
• Acrylate tris (acryloxyethyl) isocyanurate, or their modified alkylene oxide, and isocyanuric acid alkylene oxide modified tri (meth) acrylate.
• Examples of the photopolymerizable polyfunctional compound (D) having four photopolymerizable groups in one molecule include ditrimethylolpropane tetra (meth) acrylate, pentaerythritol tetra (meth) acrylate, and their alkylene oxide modified products. Etc.
• Examples of the photopolymerizable polyfunctional compound (D) having five photopolymerizable groups in one molecule include dipentaerythritol penta (meth) acrylate or their modified alkylene oxides.
• Examples of the photopolymerizable polyfunctional compound (D) having six photopolymerizable groups in one molecule include dipentaerythritol hexa (meth) acrylate, pentaerythritol triacrylate hexamethylene diisocyanate urethane oligomer (Kyoeisha Chemical Co., Ltd.) Trade name “UA-306H”), caprolactone-modified dipentaerythritol hexa (meth) acrylate, or an alkylene oxide-modified product thereof.
• an oligomer having two or more photopolymerizable groups in one molecule is preferable.
• the oligomer include urethane (meth) acrylate, polyester (meth) acrylate, and epoxy (meth) acrylate. Of these, urethane (meth) acrylate oligomers are more preferable.
• the urethane (meth) acrylate oligomer is obtained by reacting an isocyanate group-terminated urethane prepolymer obtained by reacting polyols and polyisocyanate with a (meth) acrylate monomer having at least one hydroxyl group in one molecule. .
• the number of photopolymerizable groups contained in the molecule of the photopolymerizable polyfunctional compound (D) is preferably 3 to 20, more preferably 4 to 20, and particularly preferably 5 to 15. According to the photopolymerizable polyfunctional compound (D) in which the number of photopolymerizable groups is within the above range, a dense cross-linked structure can be formed, thereby improving transparency, hardness, blocking resistance and printability. An excellent hard coat layer can be provided.
• the content of the photopolymerizable polyfunctional compound (D) in the photocurable resin composition is (meth) acrylic polymer (A), inorganic particles (B), organic particles (C), and photopolymerizable polyfunctional. Although it is limited to 20 to 70% by weight relative to the total weight of compound (D), it is preferably 23 to 65% by weight, more preferably 25 to 60% by weight. By setting the content of the photopolymerizable polyfunctional compound (D) to the above lower limit value or more, excellent hardness of the hard coat layer can be ensured.
• an inorganic particle (B) and an organic particle (C) are highly dispersed, Thereby, transparency and blocking resistance
• a hard coat layer excellent in printability can be formed.
• photopolymerization initiators oxime ester photopolymerization initiators, diazophenylamine photopolymerization initiators, naphthoquinone diazosulfonic acid photopolymerization initiators, and dimethylaminobenzoic acid photopolymerization initiators.
• a photoinitiator may be used independently or 2 or more types may be used together.
• benzoin ether photopolymerization initiator examples include benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, and benzoin isobutyl ether.
• benzophenone photopolymerization initiator examples include benzophenone, methyl o-benzoylbenzoate, 4-phenylbenzophenone, 4-benzoyl-4′-methyl-diphenyl sulfide, 2,4,6-trimethylbenzophenone, and the like.
• thioxanthone photopolymerization initiator examples include 2-isopropylthioxanthone, 2,4-diethylthioxanthone, 2,4-dichlorothioxanthone, 1-chloro-4-propoxythioxanthone and the like.
• alkylphenone photopolymerization initiator examples include 2-hydroxy-2-methyl-1-phenyl-propan-1-one, 2,2-dimethoxy-1,2-diphenylethane-1-one, and 1-hydroxy.
• -Cyclohexyl-phenyl-ketone 1- [4- (2-hydroxyethoxy) -phenyl] -2-hydroxy-2-methyl-1-propan-1-one, 2-hydroxy-1- ⁇ 4- [4- (2-hydroxy-2-methyl-propionyl) -benzyl] phenyl ⁇ -2-methyl-propan-1-one, 2-methyl-1- (4-methylthiophenyl) -2-morpholinopropan-1-one, 2-Benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butanone-1,2- (dimethylamino) -2-[(4-methylphenyl) Chill] -1- [4- (4-morpholinyl) phenyl] -1-butanone and the
• acylphosphine oxide photopolymerization initiator examples include 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide, bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide, and the like.
• titanocene photopolymerization initiators include bis ( ⁇ 5-2,4-cyclopentadien-1-yl) -bis (2,6-difluoro-3- (1H-pyrrol-1-yl) -phenyl) titanium. Etc.
• oxime ester photopolymerization initiator examples include 1,2-octanedione-1- [4- (phenylthio) -2- (O-benzoyloxime)], ethanone-1- [9-ethyl-6- ( 2-methylbenzoyl) -9H-carbazol-3-yl] -1- (O-acetyloxime), oxy-phenyl-acetic acid 2- [2-oxo-2-phenylacetoxyethoxy] ethyl ester, oxy-phenyl -Acetic acid 2- (2-hydroxyethoxy) ethyl ester and the like.
• the content of the photopolymerization initiator in the photocurable resin composition is preferably 0.1 to 20 parts by weight, preferably 0.1 to 10 parts by weight with respect to 100 parts by weight of the (meth) acrylic polymer (A). Is more preferable, and 1 to 5 parts by weight is particularly preferable.
• the photocurable resin composition of the present invention may contain a photopolymerizable monofunctional compound having one photopolymerizable group in one molecule.
• the photopolymerizable monofunctional compound is used for adjusting the viscosity of the photocurable resin composition and improving the drying property of the photocurable resin composition by increasing the solid content concentration.
• Examples of the photopolymerizable monofunctional compound include aliphatic (meth) acrylates, alicyclic (meth) acrylates, aromatic (meth) acrylates, ether (meth) acrylates, vinyl monomers, (meth) Examples include acrylamides.
• (meth) acrylamide means acrylamide or methacrylamide.
• Examples of the photopolymerizable monofunctional compound include 2-hydroxyethyl (meth) acrylate, 2-hydroxy-3-acryloyloxypropyl (meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate, cyclohexyl (meth) ) Acrylate, isooctyl (meth) acrylate, isomyristyl (meth) acrylate, isostearyl (meth) acrylate, isobornyl (meth) acrylate, ethoxy-diethylene glycol (meth) acrylate, 2-ethylhexyl-carbitol (meth) acrylate, neopentyl Glycol benzoate (meth) acrylate, nonylphenoxypolyethylene glycol (meth) acrylate, ECH modified phenoxy (meth) acrylate, phenoxyethyl ( Data) acrylate, p-cum
• the photocurable resin composition of the present invention may contain a surfactant. By using the surfactant, the printability of the hard coat layer can be improved.
• the surfactant examples include an anionic surfactant, a cationic surfactant, a nonionic surfactant, and an amphoteric surfactant. It is preferable that the surfactant has a functional group having active hydrogen. Examples of the functional group having active hydrogen include a hydroxyl group, a carboxyl group, an amino group, and an amide group.
• anionic surfactant examples include castor oil monosulfate, castor oil monophosphate, sorbitan fatty acid ester sulfate, sorbitan fatty acid ester phosphate, polyoxyalkylene glycerin ether monosulfate, polyoxyalkylene glycerin ether monophosphate, perfluoroalkyl ester.
• examples include phosphate.
• cationic surfactant examples include dialkanolamine salts, polyoxyalkylene alkylamine ether salts, polyoxyalkylene alkylammonium salts, polyoxyalkylene dialkanolamine ether salts, and the like.
• nonionic surfactants include polyoxyethylene polyoxypropylene block polymers, sorbitan fatty acid esters, polyoxyalkylene sorbitan fatty acid esters, and polyglycerin fatty acid esters.
• amphoteric surfactants include N, N-di ( ⁇ -hydroxyalkyl) N-hydroxyethyl-N-carboxyalkylammonium betaine, N, N-di (polyoxyethylene) -N-alkyl-N-sulfo.
• alkyl ammonium betaine and perfluoroalkyl betaine examples include alkyl ammonium betaine and perfluoroalkyl betaine.
• the photocurable resin composition of the present invention may contain a silane coupling agent.
• a silane coupling agent By using a silane coupling agent, the printability of the hard coat layer can be improved.
• silane coupling agent examples include epoxy group-containing silane coupling agents such as glycidoxypropyltrimethoxysilane and glycidoxypropyltriethoxysilane; aminopropyltrimethoxysilane, N-2- (aminoethyl) -3 -Amino group-containing silane coupling agents such as aminopropyltriethoxysilane and aminopropyltriethoxysilane; Mercapto group-containing silane coupling agents such as mercaptopropyltrimethoxysilane; Urethane group-containing silane couplings such as ureidopropyltriethoxysilane Agents; isocyanate group-containing silane coupling agents such as isocyanatepropyltriethoxysilane.
• epoxy group-containing silane coupling agents such as glycidoxypropyltrimethoxysilane and glycidoxypropyltriethoxysilane
• the photocurable resin composition of the present invention may contain a solvent.
• the solvent By using the solvent, the viscosity of the photocurable resin composition can be adjusted, and thereby the handleability and coating properties of the photocurable resin composition can be improved.
• the solvent is not particularly limited, and examples thereof include the same solvents as those used for the polymerization of the monomer composition in the above-described emulsion polymerization and solution polymerization.
• additives may be added as necessary within the range not impairing the physical properties.
• examples of other additives include antioxidants, light stabilizers, heat stabilizers, antistatic agents, and antifoaming agents.
• the photocurable composition of the present invention is preferably used for forming a cured film on one surface of a substrate.
• a cured film obtained by curing the photocurable composition is excellent in transparency, hardness, scratch resistance, blocking resistance, and printability. Therefore, such a cured film can be used as a hard coat layer.
• the active energy ray include ultraviolet rays, electron beams, ⁇ rays, ⁇ rays, and ⁇ rays, and ultraviolet rays and electron beams are preferable.
• an electron beam is preferably used as the active energy ray.
• the ultraviolet irradiation can be performed using an ultraviolet irradiation apparatus having a light source such as a xenon lamp, a high-pressure mercury lamp, and a metal halide lamp.
• a high pressure mercury lamp is used as the light source
• the substrate coated with the photocurable resin composition may be conveyed to a single high pressure mercury lamp at a conveyance speed of 5 to 50 m / min and irradiated with ultraviolet rays. preferable.
• the light intensity of the high pressure mercury lamp is preferably 80 to 160 W / cm.
• the substrate coated with the photocurable resin composition is preferably transported at 5 to 50 m / min using an electron beam accelerator having an acceleration voltage of 10 to 300 kV. It is preferable that the electron beam is irradiated at a speed.
• the material of the substrate is not particularly limited, and examples thereof include polyester resins such as polyethylene terephthalate and polybutylene terephthalate, polycarbonate resins, polyacrylic resins, styrene resins, ABS resins, triacetyl cellulose, and olefin resins. And synthetic resins such as glass, inorganic materials such as glass, and metals such as stainless steel, steel, and aluminum.
• polyester resins such as polyethylene terephthalate and polybutylene terephthalate
• polycarbonate resins polyacrylic resins, styrene resins, ABS resins, triacetyl cellulose, and olefin resins.
• synthetic resins such as glass, inorganic materials such as glass, and metals such as stainless steel, steel, and aluminum.
• a coating method such as a dip coating method, a spray coating method, a roll coating method, a doctor blade method, a screen printing method, a bar coater, an applicator or the like is used. Casting that had been mentioned.
• the film thickness of the coating film after drying of the photocurable resin composition coated on the substrate is not particularly limited, but is preferably 2 to 90 ⁇ m, more preferably 5 to 50 ⁇ m.
• the coated photocurable resin composition Before the light irradiation, the coated photocurable resin composition may be heated to remove the solvent contained in the photocurable resin composition.
• the cured film of the photocurable resin composition can be used in combination with inorganic particles (B) and organic particles (C), such as hardness, scratch resistance, blocking resistance, transparency, and printability. Physical properties have been improved.
• the inorganic particles and the organic particles have different refractive indexes, and when the inorganic particles and the organic particles are used in combination, the inorganic particles and the organic particles are likely to aggregate due to electrostatic repulsion between them. As a result, the combined use of inorganic particles and organic particles reduces the transparency of the cured film.
• the inorganic particles (B) and the organic particles (C) are used in combination by highly dispersing the inorganic particles (B) and the organic particles (C) using the (meth) acrylic polymer (A). It is possible to reduce the decrease in transparency of the cured film due to high.
• the cured film of the photocurable resin composition has excellent transparency.
• the haze of the cured film of the photocurable resin composition is preferably 1.0% or less, and more preferably 0.8% or less.
• the haze of the cured film is a value measured according to JIS K 7136 (2000).
• the cured film of the photocurable resin composition has excellent hardness.
• the hardness of the cured film of the photocurable resin composition is preferably H or higher, more preferably 2H or higher, as pencil hardness.
• the pencil hardness is a value measured by a pencil hardness test in accordance with JIS K 5600-5-4 (1999).
• the cured film of the photo-curable resin composition has a low coefficient of dynamic friction and excellent blocking resistance.
• the dynamic friction coefficient of the cured film of the photocurable resin composition is preferably 0.6 N or less, and more preferably 0.5 N or less.
• the dynamic friction coefficient is a value measured according to JIS K 7125 (1999).
• the cured film of the photocurable resin composition has excellent compatibility with ink and has improved printability. 35 dyn / cm or more is preferable and, as for the wetting tension of the cured film surface of a photocurable resin composition, 40 dyn / cm or more is more preferable. In addition, let the wetting tension
• the thickness of the cured film of the photocurable resin composition is preferably 2 to 90 ⁇ m and more preferably 5 to 50 ⁇ m from the viewpoint of obtaining a cured film having excellent hardness, scratch resistance, blocking resistance, and printability.
• the cured film of the photocurable resin composition of the present invention is suitably used as a hard coat layer to protect the substrate surface. It is preferable that functional layers other than the hard coat layer are laminated and integrated on the cured film. Since the cured film of the photocurable resin composition has excellent printability, a functional layer having a desired pattern shape and uniform thickness can be formed on the cured film.
• the functional layer examples include an electromagnetic wave shielding layer, a heat ray reflective layer, an ultraviolet shielding layer, a gas barrier layer, an antireflection layer, a conductive layer, a hard coat protective layer, an antiglare layer, an adhesive layer, and an antistatic layer. These functional layers can be formed by a known method.
• a conductive laminated film in which a transparent conductive layer is laminated and integrated on a cured film of a photocurable resin composition is suitably used for a touch panel. Since the cured film of the photocurable resin composition of the present invention is excellent not only in printability but also in transparency, it has a fine pattern shape on such a cured film and has excellent transparency.
• the transparent conductive layer can be formed, thereby providing a conductive laminated film in which the transparent conductive layer is hardly visible and has high visible light transmittance.
• the conductive laminated film includes a transparent substrate, a cured film of a photocurable resin composition laminated and integrated on one surface of the transparent substrate, and a transparent conductive layer laminated and integrated on one surface of the cured film. Including.
• the transparent substrate contains a transparent synthetic resin.
• Transparent synthetic resins include polyester resins, acetate resins, polyethersulfone resins, polycarbonate resins, polyamide resins, polyimide resins, polyolefin resins, (meth) acrylic resins, polyvinyl chloride resins, poly Examples thereof include vinylidene chloride resins, polystyrene resins, polyvinyl alcohol resins, polyarylate resins, polyphenylene sulfide resins, and the like.
• the thickness of the transparent substrate is preferably 2 to 200 ⁇ m, more preferably 2 to 100 ⁇ m.
• the transparent conductive layer may be laminated and integrated on the cured film of the photocurable resin composition via an adhesive layer.
• the adhesive layer contains a known adhesive.
• the adhesive for example, an acrylic adhesive, a silicone adhesive, a polyester adhesive, or the like is used.
• the constituent material of the transparent conductive layer is, for example, at least one selected from the group consisting of indium, tin, zinc, gallium, antimony, titanium, silicon, zirconium, magnesium, aluminum, gold, silver, copper, palladium, and tungsten. Examples include metal oxides.
• the transparent conductive layer has a pattern shape such as a stripe shape depending on the application in which the conductive laminated film is used.
• the transparent conductive layer As a method for forming the transparent conductive layer, a known method is used. For example, a method of printing a conductive paste is preferable. As described above, the cured film of the photocurable resin composition has high polarity due to the presence of many hydroxyl groups on the surface. Thereby, the cured film of a photocurable resin composition and a transparent conductive layer can be firmly laminated and integrated. Therefore, the method for forming the transparent conductive layer is not limited to the printing method, and an evaporation method, a sputtering method, and the like are also preferably used.
• the conductive laminated film is suitably used for a capacitive touch panel.
• the touch panel is not particularly limited, but is disposed on the front surface of the display panel of the information terminal device.
• Examples of the information terminal device include a mobile phone, a personal digital assistant (PDA), a portable game machine, a digital camera, a personal computer, and a television.
• Example Synthesis Examples 1 to 9 and Comparative Synthesis Examples 1 to 8) Synthesis of (meth) acrylic polymer
• MIBK methyl isobutyl ketone
• Methyl methacrylate (MMA), isobornyl methacrylate (IBXMA), glycidyl methacrylate (GMA), 2-hydroxyethyl methacrylate (2-HEMA), butyl acrylate (BA), and azobis-2-methylbutyroyl as radical polymerization initiator Nitrile (ABN-E) was mixed in the blending amounts shown in Tables 1 and 2 to obtain a monomer composition.
• the monomer composition is gradually dropped into the reaction vessel over 2 hours, mixed, allowed to stand for 4 hours, and then heated at 120 ° C. for 1 hour for radical polymerization. To obtain a polymer.
• acrylic acid AA
• 2-isocyanatoethyl methacrylate MOI
• paramethoxyphenol MQ
• triphenylphosphine TPP
• dibutyltin dilaurate DBTDL
• hydroxyl value The hydroxyl value of the (meth) acrylic polymer is determined by the method of 4.2 B of JIS K1557-1: 2007 (ISO 14900: 2001) “Plastics—Polyurethane raw material polyol test method—Part 1: Determination of hydroxyl value”. Measured in conformity.
• the hydroxyl value of a (meth) acrylic-type polymer means the hydroxyl value of solid content.
• ((Meth) acrylic equivalent) The (meth) acrylic equivalent of the (meth) acrylic polymer was calculated by the above formula (I) from the monomer composition that is the raw material of the (meth) acrylic polymer.
• inorganic particles silicon oxide particles (B1) having an average particle size (MD) of 10 nm, silicon oxide particles (B2) having an average particle size of 100 nm, average Silicon oxide particles (B3) having a particle diameter of 400 nm, titanium oxide particles (B4) having an average particle diameter of 100 nm, zirconium oxide particles (B5) having an average particle diameter of 100 nm, silicon oxide having an average particle diameter of 1000 nm As particles (B6) and organic particles (C), polymethyl methacrylate (PMMA) particles (C1) having an average particle size of 20 nm, polymethyl methacrylate (PMMA) particles (C2) having an average particle size of 100 nm, average particles Polymethylmethacrylate (PMMA) particles (C3) having a diameter of 400 nm, styrene type having an average particle diameter of 100 nm Fatty particles (C4), melamine resin
• the (meth) acrylic polymer produced in Examples Synthesis Examples 1 to 9 and Comparative Synthesis Examples 1 to 8 was added for 10 minutes so that the blending amounts shown in Tables 3 to 7 were obtained in terms of solid content. It was dripped gradually over the time. After completion of the dropping, the premixed solution was stirred at 30 ° C. for 30 to 60 minutes.
• Tables 3 to 7 show 2-hydroxy-2-methyl-1-phenyl-propan-1-one (BASF product name “DAROCUR 1173”) as a photopolymerization initiator in the stirred premixed solution.
• a photo-curable resin composition was obtained by adding them in a blended amount and mixing them.
• the average particle diameter of the inorganic particles (B1) to (B6) and the organic particles (C1) to (C6) in the obtained photocurable resin composition was measured by the measurement method described above. The measured value of the diameter was the same value as the above-mentioned average particle diameter of the inorganic particles (B1) to (B6) and the organic particles (C1) to (C6) used for the preparation of the premixed liquid.
• the photocurable resin composition was applied onto a polyethylene terephthalate (PET) film using a bar coater so that the dry film thickness was 5 ⁇ m. Thereafter, the photocurable resin composition was heated at 80 ° C. for 2 minutes to remove the solvent, and then the photocurable resin composition was integrated at 500 mJ / cm 2 using a high-pressure mercury lamp (light quantity 120 W / cm). The photocurable resin composition was photocured by irradiating ultraviolet rays with a light amount to form a cured film (thickness 5 ⁇ m).
• Two PET films on which a cured film was formed were prepared. These PET films were laminated so that the cured films faced to obtain a laminate. The laminated body was heated at 80 ° C. for 12 hours while applying a 5 kg load on the laminated body. Thereafter, one PET film was pulled in a direction parallel to the cured film surface at a tensile speed of 10 mm / min, and the dynamic friction coefficient (N) at this time was measured according to JIS K 7125 (1999).
• Printability The printability of the cured film was evaluated by measuring the wetting tension (dyn / cm) of the cured film surface in accordance with JIS K 6768 (1999).
• a photocurable resin composition capable of forming a hard coat layer having improved blocking resistance without lowering transparency and also having excellent printability. can do.

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