WO2011034123A1 - 光硬化性転写シート、及びこれを用いた凹凸パターンの形成方法 - Google Patents
光硬化性転写シート、及びこれを用いた凹凸パターンの形成方法 Download PDFInfo
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- WO2011034123A1 WO2011034123A1 PCT/JP2010/066020 JP2010066020W WO2011034123A1 WO 2011034123 A1 WO2011034123 A1 WO 2011034123A1 JP 2010066020 W JP2010066020 W JP 2010066020W WO 2011034123 A1 WO2011034123 A1 WO 2011034123A1
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- Prior art keywords
- photocurable
- meth
- acrylate
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- transfer sheet
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- QVLTXCYWHPZMCA-UHFFFAOYSA-N po4-po4 Chemical class OP(O)(O)=O.OP(O)(O)=O QVLTXCYWHPZMCA-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
- H01L21/0271—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
- B29C59/022—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing characterised by the disposition or the configuration, e.g. dimensions, of the embossments or the shaping tools therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
- B29C59/022—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing characterised by the disposition or the configuration, e.g. dimensions, of the embossments or the shaping tools therefor
- B29C2059/023—Microembossing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2033/00—Use of polymers of unsaturated acids or derivatives thereof as moulding material
- B29K2033/04—Polymers of esters
- B29K2033/08—Polymers of acrylic acid esters, e.g. PMA, i.e. polymethylacrylate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2033/00—Use of polymers of unsaturated acids or derivatives thereof as moulding material
- B29K2033/04—Polymers of esters
- B29K2033/12—Polymers of methacrylic acid esters, e.g. PMMA, i.e. polymethylmethacrylate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/24—Condition, form or state of moulded material or of the material to be shaped crosslinked or vulcanised
- B29K2105/246—Uncured, e.g. green
Definitions
- the present invention relates to a photocurable transfer sheet that can be advantageously used in the production of electronic devices, optical components, recording media, and the like, and a method for forming a concavo-convex pattern using the same, and particularly to nanoimprinting that is a fine processing technique.
- the progress of microfabrication technology using light or electron beam is remarkable, and the processing of 100 nm for light and 10 nm for electron beam has been achieved.
- these fine processing apparatuses are expensive, a cheaper processing technique is required.
- the nanoimprint technology is a microfabrication technology for realizing a finer structure as compared with the conventional press technology.
- This technique itself has no limit in resolution, and the resolution is determined by the accuracy of mold (ie, mold) production. Therefore, as long as the mold can be manufactured, it is possible to form an ultrafine structure with an apparatus that is easier and much cheaper than conventional photolithography.
- the nanoimprint technology is roughly divided into two types depending on the material to be transferred.
- One is a thermal nanoimprint technique in which a material to be transferred is heated, plastically deformed by a mold (mold), and then cooled to form a pattern.
- the other is a photo-nanoimprint that forms a pattern by applying a light-curing resin that is liquid at room temperature on a substrate, then pressing a light-transmitting mold against the resin and irradiating it with light.
- Technology In particular, optical nanoimprint technology enables pattern formation at room temperature, so that distortion due to differences in the linear expansion coefficient between the substrate and mold due to heat is unlikely to occur, and high-precision pattern formation is possible. Collecting.
- Patent Document 1 discloses an imprint method using two steps. That is, in the first step, the surface of the plastic polymer foil, such as a thermoplastic polymer, is placed in a face-to-face contact with a template having a surface with a fine unevenness pattern on the order of micrometers or nanometers. By the imprint process, an inverted pattern of the template surface is formed on the surface of the polymer foil. Then, in the second step, the obtained polymer stamper (intermediate stamper) is subjected to the same treatment as above, and a second inverted replica (the same pattern as the template) is formed on the surface of another plastic polymer foil. .
- the first step the surface of the plastic polymer foil, such as a thermoplastic polymer
- a template having a surface with a fine unevenness pattern on the order of micrometers or nanometers.
- the mother stamper (template) is not seriously damaged.
- a thermoplastic polymer is used for the production of the intermediate stamper, a wide variety of polymers can be used.
- a large energy of heating and cooling is required for molding, and the molding time is 1 minute or more. The disadvantage of requiring a long time. Therefore, it is difficult to shorten the tact (time required for processing) in the case of continuous production.
- Patent Document 1 describes an example in which a photocurable resin is used in combination in the production of an intermediate stamper.
- the photocurable resin is liquid, workability is poor, and curing shrinkage, thickness unevenness, etc. Since it is large, it is impossible to improve productivity including shortening of the tact time. Furthermore, there is a problem that the peelability from the mother stamper and the peelability from the cured photo-curable resin, which is a product in which the uneven pattern is transferred from the intermediate stamper, are low.
- Patent Document 2 discloses a method of producing an intermediate stamper using a photocurable transfer sheet made of a photocurable composition that can be deformed by pressurization. Thereby, workability, curing shrinkage, etc. are improved. Moreover, in patent document 2, the peelability from a mother stamper etc. are improved because the photocurable composition contains a phosphorus atom containing compound as a lubricant.
- the moldability and separation in the step of obtaining the intermediate stamper from the mother stamper in the first step by imprint processing is good, in the transfer from the intermediate stamper in the second step to the photocurable resin (especially radical curable liquid ultraviolet curable resin with good curability), the intermediate stamper contains a photocurable resin. In some cases, it is difficult to sufficiently mold an accurate uneven pattern.
- an object of the present invention is a photo-curable transfer sheet that can be advantageously used in the production of an intermediate stamper in a nanoimprint process method, and is separated from a mold having a fine concavo-convex pattern used at that time. It is an object of the present invention to provide a photocurable transfer sheet having good moldability and releasability from a photocurable resin having a concavo-convex pattern transferred from an intermediate stamper, and having excellent concavo-convex pattern transferability.
- an object of the present invention is to provide a method for forming a fine concavo-convex pattern using the photocurable transfer sheet.
- the above object is a photocurable transfer sheet having a photocurable transfer layer which is deformable by pressurization and comprises a photocurable composition comprising a polymer and a reactive diluent having a photopolymerizable functional group, This is achieved by a photocurable transfer sheet, wherein the polymer is made of an acrylic resin containing a (meth) acrylate repeating unit having an alicyclic group.
- a photocurable transfer layer contains a polymer having an alicyclic skeleton with low polarity.
- Preferred embodiments of the photocurable transfer sheet of the present invention are as follows.
- the (meth) acrylate repeating unit having the alicyclic group is a (meth) acrylate repeating unit having an isobornyl group and / or a cyclohexyl group.
- the content of the (meth) acrylate repeating unit having an alicyclic group is 32 to 44% by mass with respect to the dry mass of the photocurable composition.
- the reactive diluent includes a monomer having an alicyclic group.
- the monomer having an alicyclic group is a monomer having a dimethyloltricyclodecane group or an isobornyl group.
- the above-mentioned purpose is as follows: (1) The surface of a mold having a fine concavo-convex pattern on the surface is formed on the transfer layer of the photocurable transfer sheet according to any one of claims 1 to 5, wherein the concavo-convex pattern surface of the mold is A step of placing and pressing so as to contact the surface of the transfer layer to form a laminate in which the surface of the transfer layer is adhered along the surface of the concavo-convex pattern; (2) a step of curing the transfer layer of the laminate having a mold by ultraviolet irradiation, and (3) a step of forming a fine inverted concavo-convex pattern on the surface of the transfer layer by removing the mold.
- this method since the fine concavo-convex pattern on the surface of the mold is transferred using the photocurable transfer sheet of the present invention, the releasability between the photocurable transfer sheet and the mold is good, A reverse concavo-convex pattern having no defect can be formed on the transfer layer without part of the transfer layer adhering to the mold.
- the surface of the fine reversal unevenness pattern of the photocurable transfer sheet (intermediate stamper) on which the reversal unevenness pattern of the unevenness pattern of the mold is formed is formed on the substrate.
- the photocurable resin layer made of the photocurable resin composition is placed and pressed so that the reverse concavo-convex pattern surface of the intermediate stamper is in contact with the surface of the photocurable resin layer.
- a fine concavo-convex pattern is transferred to a photocurable resin layer formed on a substrate using the photocurable transfer sheet of the present invention on which a reverse concavo-convex pattern of a mold is formed as an intermediate stamper.
- the releasability between the intermediate stamper and the cured photocurable resin layer is particularly good, and the same uneven pattern as the mold without any defects is obtained without a part of the photocurable resin layer adhering to the intermediate stamper. Can be formed.
- corrugated pattern of this invention is as follows.
- the photocurable resin composition is liquid. In the method of the present invention, even if it is a liquid photocurable resin composition, releasability is good and effective.
- the mold is a stamper. The method of the present invention is effective for forming an uneven pattern using a stamper used in the nanoimprint process.
- the photocurable transfer sheet of the present invention has a photocurable transfer layer containing a polymer having an alicyclic skeleton with low polarity, release property from a mold or a photocurable resin, particularly a photocurable resin (particularly, It is a photocurable transfer sheet that has good releasability from a radical curable ultraviolet curable resin) and excellent transferability of the concavo-convex pattern.
- the method for forming a fine concavo-convex pattern such as the optical nanoimprint process method of the present invention uses the photo-curable transfer sheet of the present invention as an intermediate stamper. It is a method which can be transferred to a functional resin.
- an electronic display rib an electronic device (lithography, a transistor), an optical component (a microlens array, a waveguide, an optical filter, a photonic crystal), a bio-related material (a DNA chip, a microreactor) ) And recording media (patterned media, DVD) can be advantageously obtained.
- FIG. 1 is a schematic sectional view showing a typical example of the photocurable transfer sheet of the present invention.
- FIG. 2 is a schematic sectional view showing a typical example of the method for forming a fine unevenness pattern according to the present invention.
- FIG. 3 is a schematic cross-sectional view showing a typical example of the method for forming a fine concavo-convex pattern according to the present invention (when it is performed subsequently from FIG. 2).
- FIG. 4 is a schematic cross-sectional view showing a typical example of a method for continuously forming a fine concavo-convex pattern according to the present invention.
- FIG. 1 is a schematic sectional view showing a typical example of an embodiment of a photocurable transfer sheet 10 of the present invention.
- the photocurable transfer layer 11 is provided with a transparent film 12 made of a polymer film 12b having an easy adhesion layer 12a on one surface, and a release sheet 13 on the other surface.
- the transparent film 12 is strongly bonded to the photocurable transfer layer 11 by the easy adhesion layer 12a. Therefore, the easy-adhesion layer 12a exhibits excellent adhesiveness with the photocurable transfer layer 11, the cured photocurable transfer layer 11 and the polymer film 12b.
- the film self-supporting property of the photocurable transfer sheet 10 and the cured photocurable transfer sheet 10 is imparted by the polymer film 12b.
- the release sheet 13 is a sheet for protecting the photocurable transfer layer, and may be omitted. However, when the release sheet 13 is used as a long sheet, it is preferably provided in terms of handling properties.
- the release sheet is generally provided with a release layer on a plastic sheet. The release layer is provided so as to be in contact with the surface of the photocurable transfer layer 11 and is removed during normal use.
- the photo-curable transfer layer 11 in the present invention is a layer that is easily deformed by pressurization so that it can be accurately transferred by pressing the surface of the fine concavo-convex pattern of a mold (preferably a stamper).
- a mold preferably a stamper.
- the photocurable composition for forming the photocurable transfer layer 11 is a polymer, a photopolymerizable functional group (generally a carbon-carbon double bond group, preferably a (meth) acryloyl group (acryloyl group and A methacryloyl group, the same applies hereinafter))), a reactive diluent (monomer and oligomer), a photopolymerizable initiator, and optionally other additives.
- a photopolymerizable functional group generally a carbon-carbon double bond group, preferably a (meth) acryloyl group (acryloyl group and A methacryloyl group, the same applies hereinafter)
- a reactive diluent monomer and oligomer
- the photocurable transfer layer in the present invention is releasable from a mold or a photocurable resin, particularly photocuring.
- the releasability with the functional resin is good.
- the alicyclic group includes an alicyclic hydrocarbon group and an alicyclic ether group.
- the alicyclic group preferably has 3 to 12 carbon atoms.
- Examples of the alicyclic hydrocarbon group include an isobornyl group, a cyclohexyl group, a norbornyl group, a cyclodecyl group, a cyclopentyl group, a menthyl group, a fentyl group, and an adamantyl group.
- the alicyclic ether group include a tetrahydrofurfuryl group, a tetrahydropyran-2-methyl group, and a 3-ethyl-3-oxetanemethyl group.
- An alicyclic hydrocarbon is preferable in that an alicyclic skeleton having a lower polarity is obtained and the releasability of the photocurable transfer layer is excellent, and an isobornyl group and a cyclohexyl group are particularly preferable.
- the content of the (meth) acrylate repeating unit having an alicyclic group is not particularly limited, but if the content is too low, the releasability is lowered, and if it is too high, the transferability and workability may be lowered. Accordingly, the content of the (meth) acrylate repeating unit having an alicyclic group is preferably from 32 to 44% by mass, more preferably from 37 to 43% by mass, based on the dry weight of the photocurable composition.
- the content of the (meth) acrylate repeating unit having an alicyclic group in the photocurable composition is as follows. Calculate as follows. (1) The content of the (meth) acrylate repeating unit having an alicyclic group in the polymer of the photocurable composition (also referred to as “alicyclic group-containing monomer unit content P” in the present invention) is photocurable. It is calculated according to formula (I) from the alicyclic group-containing monomer mass and the total monomer mass used for preparing the polymer of the composition.
- the polymer of the photocurable composition that forms the photocurable transfer layer 11 is preferably a polymer having a glass transition temperature (Tg) of 80 ° C. or higher.
- Tg glass transition temperature
- die can be transcribe
- the cured shape also has a high Tg, the shape can be maintained for a long time without changing.
- a polymer having a glass transition temperature of 80 ° C. or higher has a polymerizable functional group, which can react with a reactive diluent and is advantageous in increasing the speed of curing.
- the photocurable transfer layer 11 contains a diisocyanate by having a hydroxyl group, the polymer can be slightly cross-linked, and the transfer layer oozes out and the layer thickness variation is greatly suppressed. Is particularly advantageous. Diisocyanates have the above effects to some extent even in polymers that do not have hydroxyl groups.
- the acrylic resin constituting the polymer of the photocurable composition is particularly preferably an acrylic resin having a polymerizable functional group or an acrylic resin having a hydroxyl group.
- the acrylic resin having a polymerizable functional group includes at least one of (meth) acrylic acid ester having the above-described alicyclic group (indicating acrylic acid ester and methacrylic acid ester, the same shall apply hereinafter) and glycidyl ( A copolymer comprising a meth) acrylate as a monomer component and a carboxylic acid having a polymerizable functional group reacted with the glycidyl group, or at least one of the above-mentioned (meth) acrylic acid ester having an alicyclic group; , A copolymer having a carboxylic acid having a polymerizable functional group as a monomer component, and a glycidyl (meth) acrylate reacted with the carboxylic acid group.
- an acrylate ester having 3 to 12 carbon atoms in the alicyclic group is preferable.
- Examples include tetrahydrofurfuryl (meth) acrylate, tetrahydropyran-2-methyl (meth) acrylate, and 3-ethyl-3-oxetanemethyl (meth) acrylate.
- the (meth) acrylic acid ester having an alicyclic group is preferably a (meth) acrylic acid ester having an alicyclic hydrocarbon group such as isobornyl (meth) acrylate, cyclohexyl (meth) acrylate, cyclodecyl (meth) acrylate,
- isobornyl (meth) acrylate and cyclohexyl (meth) acrylate are particularly preferable in that a photocurable transfer layer having excellent releasability and transferability can be obtained.
- the content of the (meth) acrylic acid ester ((meth) acrylate) repeating unit having an alicyclic group in the polymer is not particularly limited, but is preferably 50 to 100% by mass, and more preferably 60 to 90%. % By mass.
- the content of the (meth) acrylate repeating unit having an alicyclic group with respect to the entire photocurable composition may affect the releasability of the photocurable transfer layer. Therefore, it is preferable to adjust the content of the (meth) acrylate repeating unit having an alicyclic group at the stage of preparation of the polymer.
- glycidyl (meth) acrylate or a carboxylic acid having a polymerizable functional group is generally contained in the polymer as a repeating unit in an amount of 5 to 25% by mass, particularly 5 to 20% by mass.
- the glycidyl group or carboxylic acid group of the obtained copolymer is reacted with a carboxylic acid or glycidyl (meth) acrylate having a polymerizable functional group, respectively.
- methyl (meth) acrylate or an alcohol residue (meth) acrylic acid ester having 2 to 10 carbon atoms may be included.
- (meth) acrylic acid esters of alkyl having 2 to 10 carbon atoms (particularly 3 to 5) alcohol residues include ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, Examples thereof include n-butyl (meth) acrylate, isobutyl (meth) acrylate, 2-ethylhexyl (meth) acrylate and the like.
- methyl (meth) acrylate methyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, and 2-ethylhexyl (meth) acrylate are preferable, and methyl (meth) acrylate is particularly preferable.
- the acrylic resin having the polymerizable functional group can be produced, for example, as follows.
- One or a plurality of (meth) acrylate monomers including at least one (meth) acrylate ester having an alicyclic group
- a compound having one glycidyl group and one polymerizable functional group Preferably, glycidyl (meth) acrylate) or a carboxylic acid having a polymerizable functional group is reacted with a radical polymerization initiator and a known method such as a solution polymerization method in the presence of an organic solvent to form a copolymer.
- a group-containing acrylic resin (a) or a carboxyl group-containing acrylic resin (b) is obtained.
- a carboxylic acid having a polymerizable functional group is added to the obtained glycidyl group-containing acrylic resin (a), or one glycidyl group and one polymerizable functional group are added to the obtained carboxyl group-containing acrylic resin (b).
- An acrylic photocurable resin (A) or an acrylic photocurable resin (B) is obtained by adding a compound (preferably glycidyl methacrylate) having heat and heating as necessary.
- the blending ratio is preferably such that the molar ratio of glycidyl group to carboxyl group is 1 / 0.9 to 1/1, and more preferably 1/1.
- the reaction can be carried out by a known method in the presence of a basic catalyst, a phosphorus catalyst or the like.
- the acrylic resin having a hydroxyl group includes at least one of the above-mentioned (meth) acrylic acid ester having an alicyclic group, and an alkyl having 2 to 4 carbon atoms in which an alcohol residue has a hydroxyl group. It is a copolymer with at least 1 sort (s) of (meth) acrylic acid ester.
- an acrylate ester having 3 to 12 carbon atoms in the alicyclic group is preferable.
- Examples include tetrahydrofurfuryl (meth) acrylate, tetrahydropyran-2-methyl (meth) acrylate, and 3-ethyl-3-oxetanemethyl (meth) acrylate.
- the (meth) acrylic acid ester having an alicyclic group is preferably a (meth) acrylic acid ester having an alicyclic hydrocarbon group such as isobornyl (meth) acrylate, cyclohexyl (meth) acrylate, cyclodecyl (meth) acrylate,
- isobornyl (meth) acrylate and cyclohexyl (meth) acrylate are particularly preferable in that a photocurable transfer layer having excellent releasability and transferability can be obtained.
- the content of the repeating unit ((meth) acrylate repeating unit) of the (meth) acrylic acid ester having an alicyclic group in the polymer is not particularly limited, but is preferably 50 to 100% by mass, and more preferably 60 to 90% by mass.
- the content of the (meth) acrylate repeating unit having an alicyclic group with respect to the entire photocurable composition may affect the releasability of the photocurable transfer layer. Therefore, it is preferable to adjust the content of the (meth) acrylate repeating unit having an alicyclic group at the stage of preparation of the polymer.
- alkyl (meth) acrylic acid ester having 2 to 4 carbon atoms in which the alcohol residue has a hydroxyl group examples include 2-hydroxyethyl methacrylate and hydroxypropyl methacrylate.
- the polymer generally contains 5 to 25% by mass, particularly 5 to 20% by mass.
- methyl (meth) acrylate or an alcohol residue (meth) acrylic acid ester having 2 to 10 carbon atoms may be included.
- (meth) acrylic acid esters of alkyl having 2 to 10 carbon atoms (particularly 3 to 5) alcohol residues include ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, Examples thereof include n-butyl (meth) acrylate, isobutyl (meth) acrylate, 2-ethylhexyl (meth) acrylate and the like.
- methyl (meth) acrylate methyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, and 2-ethylhexyl (meth) acrylate are preferable, and methyl (meth) acrylate is particularly preferable.
- the acrylic resin preferably has a number average molecular weight of 90000 or more, particularly 90000 to 1000000, and a weight average molecular weight of 90000 or more, particularly 90000 to 300000.
- an acrylic resin having both a functional group having an active hydrogen such as a hydroxyl group and a photopolymerizable functional group can also be used as the acrylic resin.
- a reactive acrylic resin has a photopolymerizable functional group and a functional group having active hydrogen in the main chain or side chain. Therefore, such a reactive acrylic resin has, for example, a (meth) acrylate monomer containing at least one of the above-described (meth) acrylic acid ester having an alicyclic group and a functional group such as a hydroxyl group (meth).
- a copolymer of acrylate eg, 2-hydroxyethyl (meth) acrylate
- the resulting polymer reacts with a functional group of the polymer such as isocyanatoalkyl (meth) acrylate and has a photopolymerizable group. It can be obtained by reacting with a compound.
- the acrylic resin which has a hydroxyl group and a photopolymerizable functional group as a functional group which has active hydrogen is obtained by adjusting and using the amount of isocyanatoalkyl (meth) acrylate so that a hydroxyl group may remain.
- a photopolymerizable functional group having an amino group as a functional group having active hydrogen by using a (meth) acrylate having an amino group instead of a hydroxyl group (eg, 2-aminoethyl (meth) acrylate) A containing acrylic resin can be obtained.
- a photopolymerizable functional group-containing acrylic resin having a carboxyl group or the like as a functional group having active hydrogen can also be obtained.
- an acrylic resin having the photopolymerizable functional group via a urethane bond is also preferable.
- the acrylic resin having a photopolymerizable functional group generally contains 1 to 50 mol%, particularly 5 to 30 mol% of the photopolymerizable functional group.
- this photopolymerizable functional group an acryloyl group, a methacryloyl group, and a vinyl group are preferable, and an acryloyl group and a methacryloyl group are particularly preferable.
- the photocurable composition forming the photocurable transfer layer may contain another polymer as long as the effects of the present invention are not impaired.
- Other polymers include polyvinyl acetate, vinyl acetate / (meth) acrylate copolymer, ethylene / vinyl acetate copolymer, polystyrene and its copolymer, polyvinyl chloride and its copolymer, butadiene / acrylonitrile copolymer Polymer, Acrylonitrile / Butadiene / Styrene copolymer, Methacrylate / Acrylonitrile / Butadiene / Styrene copolymer, 2-Chlorobutadiene-1,3-polymer, Chlorinated rubber, Styrene / Butadiene / Styrene copolymer, Styrene / Isoprene / Examples include styrene block copolymers, epoxy resins, polyamides, polyesters,
- (meth) acrylic monomers include dimethylol tricyclodecane di (meth) acrylate, isobornyl (meth) acrylate, tricyclodecane mono (meth) acrylate, dicyclopentenyloxyethyl (meth) acrylate, 1,6 -Hexanediol di (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 2-hydroxy-3-phenyloxypropyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, 2-ethylhexyl polyethoxy (meth) acrylate, benz
- Examples of (meth) acrylate oligomers include polyol compounds (for example, ethylene glycol, propylene glycol, neopentyl glycol, 1,6-hexanediol, 3-methyl-1,5-pentanediol, 1,9-nonanediol).
- polyol compounds for example, ethylene glycol, propylene glycol, neopentyl glycol, 1,6-hexanediol, 3-methyl-1,5-pentanediol, 1,9-nonanediol.
- Polyols such as 2-ethyl-2-butyl-1,3-propanediol, trimethylolpropane, diethylene glycol, dipropylene glycol, polypropylene glycol, 1,4-dimethylolcyclohexane, bisphenol A polyethoxydiol, polytetramethylene glycol
- a polyol which is a reaction product of the polyol and a polybasic acid such as succinic acid, maleic acid, itaconic acid, adipic acid, hydrogenated dimer acid, phthalic acid, isophthalic acid, terephthalic acid, or an acid anhydride thereof.
- the reactive diluent in order to further improve the releasability of the photocurable transfer layer, it is preferable that the reactive diluent also contains a monomer having a low polarity alicyclic group.
- the monomer having an alicyclic group include dimethylol tricyclodecane di (meth) acrylate, isobornyl (meth) acrylate, tricyclodecane mono (meth) acrylate, and dicyclopentenyloxyethyl (meth) acrylate. Dimethylol tricyclodecane di (meth) acrylate and isobornyl (meth) acrylate are preferred.
- the mass ratio of the polymer of the photocurable composition to the reactive diluent is preferably in the range of 20:80 to 80:20, particularly 30:70 to 70:30.
- the polymer film 12b of the transparent film 12 may be anything as long as it has transparency and physical properties that can be used for the photocurable transfer sheet 10 of the present invention.
- a polyester film is preferred. This polyester is a linear saturated polyester synthesized from an aromatic dibasic acid or an ester-forming derivative thereof and a diol or an ester-forming derivative thereof.
- polyesters examples include polyethylene terephthalate (PET), polyethylene-2,6-naphthalate, polyethylene isophthalate, polyethylene isophthalate, polybutylene terephthalate, poly (1,4-cyclohexylenedimethylene terephthalate), and the like. These copolymers or blends thereof with other resins as subcomponents (less than 50 mol%) may also be used.
- PET polyethylene terephthalate
- polyethylene-2,6-naphthalate polyethylene isophthalate
- polyethylene isophthalate polyethylene isophthalate
- polybutylene terephthalate poly (1,4-cyclohexylenedimethylene terephthalate)
- poly (1,4-cyclohexylenedimethylene terephthalate) examples include polyethylene terephthalate (PET), polyethylene-2,6-naphthalate, polyethylene isophthalate, polyethylene isophthalate, polybutylene terephthalate, poly (1,4-cyclo
- the thickness of the polymer film 12b is preferably 1 to 500 ⁇ m, more preferably 3 to 400 ⁇ m, still more preferably 6 to 300 ⁇ m, and particularly preferably 12 to 250 ⁇ m.
- the easy adhesion layer 12a of the transparent film 12 may be omitted, but it is preferable to provide the easy adhesion layer 12a in order to strengthen the adhesion between the polymer film 12b and the photocurable transfer layer 11. . It is preferable that the easy-adhesion layer 12a is easy-adhesion which consists of a 1 type, or 2 or more types of mixture of a polyester resin, a polyurethane resin, and an acrylic resin.
- the thickness of the easy adhesion layer 12a is preferably in the range of 0.01 to 0.3 ⁇ m, particularly preferably in the range of 0.02 to 0.2 ⁇ m.
- FIG. 2 and 3 are schematic cross-sectional views showing a typical example of the embodiment in the method for forming a fine unevenness pattern of the present invention.
- the release sheet 13 is removed from the photocurable transfer sheet 10 to expose the photocurable transfer layer 11.
- the photocurable transfer layer 11 is bonded and fixed to the easy adhesion layer 12a on the polymer film 12b of the transparent film 12.
- the stamper 14 is disposed as a mold so that the fine concavo-convex pattern surface faces the surface of the photocurable transfer layer 11 (FIG. 2A).
- the stamper 14 is pressed on the photocurable transfer layer 11 to form a laminate in which the surface of the photocurable transfer layer 11 is in close contact with the surface of the uneven pattern of the stamper 14 (FIG. 2B).
- Step (1) The photocurable transfer layer 11 is heated as necessary so that pressing is possible. If it can be pressed at room temperature, it is not necessary to heat. In this state, the photocurable transfer layer 11 is cured by irradiation with light (UV) (step (2)). It is preferable to irradiate with light while pressing because the tact time can be shortened. Thereafter, the stamper 14 is removed from the cured photocurable transfer layer 11c (FIG. 2C: step (3)).
- a concavo-convex pattern in which the fine concavo-convex pattern of the stamper 14 is inverted is formed on the photocurable transfer layer 11.
- the transferability is good, and the releasability between the stamper 14 and the cured photocurable transfer layer 11c is extremely good.
- a part of the transfer layer 11 does not adhere to the stamper 14. Therefore, a reverse concavo-convex pattern having no defect can be formed, and the stamper 14 is not damaged.
- the photocurable transfer sheet 10 on which the concave / convex pattern in which the fine concave / convex pattern of the stamper 14 is inverted is used as an intermediate stamper, the photocurable resin layer formed on the substrate 15 by the following steps. An uneven pattern can be formed on the surface of 16.
- a liquid photocurable resin composition is applied to the surface of the substrate 15 to form a photocurable resin layer 16.
- the substrate 15 include a substrate for electronic components and a substrate on which a predetermined wiring pattern is formed.
- a silicon substrate, a metal substrate such as copper, chromium, iron, and aluminum, a glass substrate, and the like can be given.
- the intermediate stamper 20 provided with the photocurable transfer layer 11c having the concavo-convex pattern surface obtained by inverting the fine concavo-convex pattern of the stamper 14 on the transparent film 12 is obtained. It arrange
- the intermediate stamper 20 is pressed onto the photocurable resin layer 16 (FIG. 3E: Step (4) above).
- the photocurable resin layer 16 is heated as necessary so that pressing is possible. If it can be pressed at room temperature, it is not necessary to heat. In this state, the photocurable resin layer 16 is cured by irradiation with light (UV) (step (5)).
- the intermediate stamper 20 is removed from the photocurable resin layer 16 on which the concavo-convex pattern surface is formed and cured (FIG. 3F: step (6)). In this way, a fine concavo-convex pattern having the same pattern as the fine concavo-convex pattern of the stamper is formed on the photocurable resin layer 16.
- the photocurable transfer sheet 10 of the present invention since the photocurable transfer sheet 10 of the present invention is used for the intermediate stamper 20, the transferability is good, and the releasability between the photocurable resin layer 16 and the intermediate stamper 20 is extremely good.
- a part of the photocurable resin layer 16 does not adhere to the intermediate stamper 20. Therefore, a concavo-convex pattern without defects (the same concavo-convex pattern as the mold) can be formed on the surface of the photocurable resin layer 16.
- the photo-curable resin layer 16 may be formed of a photo-curable composition having pressure deformation similar to that of the photo-curable transfer sheet 10, but liquid light is used in that it can be applied to a thin film on the substrate 15.
- a curable resin composition is preferred.
- the photocurable transfer sheet of the present invention since the photocurable transfer sheet of the present invention is used, the releasability from the liquid photocurable resin composition is improved, which is effective.
- steps (1) to (6) are repeated to form a photocurable resin layer having a fine concavo-convex pattern.
- the intermediate stamper 20 a photocurable resin layer having a large number of fine concavo-convex patterns is prepared. May be. That is, after performing steps (1) to (3), steps (4) to (6) may be repeated.
- the stamper is used as the mold, but other molds can be used in the same manner.
- a stamper used for a nanoimprint process method or the like is preferable as a mold because it is advantageous for transferring a fine uneven pattern.
- Any material may be used, but preferably nickel, titanium, silicon, quartz or the like can be applied. Nickel is particularly preferable.
- FIG. 4 is a schematic sectional view showing a typical example of an embodiment in which the uneven pattern forming method of the present invention is continuously performed.
- the photocurable transfer sheet 30 is sent out from the feed roll 36a, and the release sheet 33 is taken up and removed by the take-up roll 36b via the guide roll 36c.
- the photocurable transfer layer 31 adhered and fixed to the transparent film 32 (having the polymer film and an easy-adhesion layer thereon) is exposed and conveyed in the direction of the arrow through the guide roll 36d, and has a fine uneven pattern.
- UV transmissive pressure bonding part 35 that includes a stamper part 34 and a UV lamp 37 and moves up and down
- the conveyance stops the UV transmissive pressure bonding part 35 moves downward and pushes down the transparent film 32
- the photocurable transfer layer 31 is pressed against the stamper part 34.
- the UV lamp 37 irradiates the light, and the photocurable transfer layer 31 is cured.
- the UV transmissive pressure bonding part 35 moves upward, the cured photocurable transfer layer 31c is peeled off from the stamper part 34, and a fine uneven pattern of the stamper part 34 is formed on the surface of the photocurable transfer layer 31c.
- An inverted concavo-convex pattern is formed (intermediate stamper).
- the photocurable transfer layer 31c adhered and fixed to the transparent film 32 is transported again, the substrate 40 on which the liquid photocurable resin composition is applied and the photocurable resin layer 41 is formed, and a UV lamp 47. And the conveyance stops again when it comes between the UV transmissive pressure bonding parts 45 that operate up and down. Next, the UV transmissive pressure bonding part 45 moves downward, pushes down the transparent film 32, and presses the photocurable transfer layer 31 c against the photocurable resin layer 41. After pressing or simultaneously with pressing, the UV lamp 47 irradiates light and the photocurable resin layer 41 is cured.
- the UV transmissive pressure bonding part 45 moves upward, and the cured photocurable resin layer 41 is peeled off from the photocurable transfer layer 31c, and the surface of the photocurable resin layer 41 is the same as the stamper part 34. A fine uneven pattern is formed, resulting in a product.
- the photocurable transfer layer 31c adhered and fixed to the transparent film 32 may be used as an intermediate stamper to form fine uneven patterns on a plurality of photocurable resin layers by a similar process. Thereafter, the photocurable transfer layer 31c adhered and fixed to the transparent film 32 is taken up by the take-up roll 36f through the guide roll 36e.
- the transfer from the stamper portion 34 to the photocurable transfer layer 31 and the transfer from the photocurable transfer layer 31c to the photocurable resin layer 41 may not be performed continuously.
- the photocurable transfer layer 31c adhered and fixed to the transparent film is wound up by the take-up roll 36f, it is appropriately used as an intermediate stamper and transferred to the photocurable resin layer 41 to produce a product. Also good.
- photopolymerization initiator As the photopolymerization initiator contained in the photocurable composition forming the photocurable transfer layer, any known photopolymerization initiator can be used, but it has good storage stability after blending. Is desirable. Examples of such photopolymerization initiators include benzoin series such as acetophenone series and benzyl dimethyl ketal, thiophenone series such as benzophenone series, isopropylthioxanthone, and 2-4-diethylthioxanthone, and other special types such as methylphenylglycone. Oxylate can be used.
- 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- (4- (methylthio) phenyl) -2-morpholinopropane-1 examples include benzophenone.
- These photopolymerization initiators may contain one or more known photopolymerization accelerators such as benzoic acid-based or tertiary amine-based compounds such as 4-dimethylaminobenzoic acid, if necessary. Can be mixed and used. Moreover, it can be used by 1 type, or 2 or more types of mixture of only a photoinitiator.
- the photocurable initiator (nonvolatile content) preferably contains 0.1 to 20% by mass, particularly 1 to 10% by mass of a photopolymerization initiator.
- examples of the acetophenone-based polymerization initiator include 4-phenoxydichloroacetophenone, 4-t-butyl-dichloroacetophenone, 4-t-butyl-trichloroacetophenone, diethoxyacetophenone, 2-hydroxy-2 -Methyl-1-phenylpropan-1-one, 1- (4-isopropylphenyl) -2-hydroxy-2-methylpropan-1-one, 1- (4-dodecylphenyl) -2-hydroxy-2-methyl Propan-1-one, 4- (2-hydroxyethoxy) -phenyl (2-hydroxy-2-propyl) ketone, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- (4- (methylthio) phenyl) -2 -As benzophenone polymerization initiators such as morpholinopropane-1 Benzophenone, benzoyl benzoate, methyl benzoyl benzo
- acetophenone polymerization initiator in particular, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- (4- (methylthio) phenyl) -2 -Morpholinopropane-1 is preferred.
- benzophenone polymerization initiator benzophenone, benzoylbenzoic acid, and methyl benzoylbenzoate are preferable.
- Tertiary amine photopolymerization accelerators include triethanolamine, methyldiethanolamine, triisopropanolamine, 4,4′-dimethylaminobenzophenone, 4,4′-diethylaminobenzophenone, ethyl 2-dimethylaminobenzoate. , Ethyl 4-dimethylaminobenzoate, ethyl 4-dimethylaminobenzoate (n-butoxy), isoamyl 4-dimethylaminobenzoate, 2-ethylhexyl 4-dimethylaminobenzoate, and the like.
- examples of the photopolymerization accelerator include ethyl 4-dimethylaminobenzoate, ethyl 4-dimethylaminobenzoate (n-butoxy), isoamyl 4-dimethylaminobenzoate, 2-ethylhexyl 4-dimethylaminobenzoate, and the like. Is mentioned.
- tolylene diisocyanate (TDI), isophorone diisocyanate, xylylene diisocyanate, diphenylmethane-4,4-diisocyanate
- TDI tolylene diisocyanate
- isophorone diisocyanate isophorone diisocyanate
- xylylene diisocyanate isophorone diisocyanate
- diphenylmethane-4,4-diisocyanate Dicyclopentanyl diisocyanate, hexamethylene diisocyanate, 2,4,4′-trimethylhexamethylene diisocyanate, 2,2 ′, 4-trimethylhexamethylene diisocyanate can be used.
- Polyisocyanate cyanates such as trifunctional or higher functional isocyanate compounds such as a TDI adduct of trimethylolpropane can also be used. Of these, a hexamethylene diisocyanate adduct of trimethylolpropane is preferred.
- diisocyanate is preferably contained in the photocurable composition (non-volatile content) in the range of 0.2 to 4% by mass, particularly 0.2 to 2% by mass.
- Appropriate crosslinking is provided to prevent the transfer layer from seeping out, and good transferability of the unevenness of a mold such as a stamper is also maintained.
- the reaction between the compound and the polymer proceeds gradually after the transfer layer is formed, and reacts considerably at room temperature (generally 25 ° C.) at 24 hours. It is considered that the reaction proceeds after the coating liquid for forming the transfer layer is prepared and before it is applied. After forming the transfer layer, it is preferable to cure to a certain extent before winding it in the roll state. If necessary, the reaction is promoted by heating during the formation of the transfer layer or before winding in the roll state. You may let them.
- thermoplastic resin and other additives it is preferable to add the following thermoplastic resin and other additives to the photocurable composition for forming the photocurable transfer layer, if desired.
- Lubricants include alkyl polyoxyalkylene phosphate compounds, trialkyl phosphate phosphate compounds, phosphorus atom-containing compounds such as phosphates and phosphate amides, silicone resins such as unmodified or modified polysiloxanes, and fluoro (meth) acrylates. And fluorine atom-containing ethylenic compounds.
- the addition amount of the lubricant is usually 0.01 to 5 parts by mass with respect to 100 parts by mass of the polymer (solid content).
- silane coupling agent (adhesion promoter) can be added as another additive.
- this silane coupling agent vinyltriethoxysilane, vinyltris ( ⁇ -methoxyethoxy) silane, ⁇ -methacryloxypropyltrimethoxysilane, vinyltriacetoxysilane, ⁇ -glycidoxypropyltrimethoxysilane, ⁇ -glycidoxy Propyltriethoxysilane, ⁇ - (3,4-epoxycyclohexyl) ethyltrimethoxysilane, ⁇ -chloropropylmethoxysilane, vinyltrichlorosilane, ⁇ -mercaptopropyltrimethoxysilane, ⁇ -aminopropyltriethoxysilane, N- ⁇ (Aminoethyl) - ⁇ -aminopropyltrimethoxysilane and the like can be used, and one of these can be used alone or
- an epoxy group-containing compound can be added for the purpose of improving adhesiveness.
- the epoxy group-containing compound include triglycidyl tris (2-hydroxyethyl) isocyanurate; neopentyl glycol diglycidyl ether; 1,6-hexanediol diglycidyl ether; acrylic glycidyl ether; 2-ethylhexyl glycidyl ether; Examples thereof include phenol glycidyl ether; pt-butylphenyl glycidyl ether; adipic acid diglycidyl ester; o-phthalic acid diglycidyl ester; glycidyl methacrylate; Further, the same effect can be obtained by adding an oligomer containing an epoxy group having a molecular weight of several hundred to several thousand or a polymer having a weight average molecular weight of several thousand to several hundred thousand. The addition amount of these epoxy group-containing compounds is 0.1
- a hydrocarbon resin can be added for the purpose of improving processability such as processability and bonding.
- the added hydrocarbon resin may be either a natural resin type or a synthetic resin type.
- rosin, rosin derivatives, and terpene resins are preferably used.
- rosin gum-based resins, tall oil-based resins, and wood-based resins can be used.
- rosin derivative rosin obtained by hydrogenation, heterogeneity, polymerization, esterification, or metal chloride can be used.
- terpene resin a terpene phenol resin can be used in addition to a terpene resin such as ⁇ -pinene and ⁇ -pinene.
- dammar, corbal and shellac may be used as other natural resins.
- petroleum resin, phenol resin, and xylene resin are preferably used.
- the petroleum resin aliphatic petroleum resin, aromatic petroleum resin, alicyclic petroleum resin, copolymer petroleum resin, hydrogenated petroleum resin, pure monomer petroleum resin, and coumarone indene resin can be used.
- the phenol resin an alkyl phenol resin or a modified phenol resin can be used.
- xylene-based resin a xylene resin or a modified xylene resin can be used.
- the addition amount of the resin such as the hydrocarbon resin is appropriately selected, but is preferably 1 to 20 parts by mass, more preferably 5 to 15 parts by mass with respect to 100 parts by mass of the polymer (solid content).
- the photocurable composition of the present invention may contain a small amount of an ultraviolet absorber, an anti-aging agent, a dye, a processing aid and the like.
- additives such as fine particles such as silica gel and calcium carbonate may be contained in a small amount.
- the storage elastic modulus of the photocurable transfer layer at a frequency of 1 Hz is preferably 1 ⁇ 10 7 Pa or less at 25 ° C., and particularly in the range of 1 ⁇ 10 4 to 6 ⁇ 10 5 Pa. preferable. Further, it is preferably 8 ⁇ 10 4 Pa or less at 80 ° C., and particularly preferably in the range of 1 ⁇ 10 4 to 5 ⁇ 10 5 Pa. This enables accurate and quick transfer. Furthermore, the photocurable transfer layer of the present invention preferably has a glass transition temperature of 20 ° C. or lower. Thereby, when the obtained photocurable transfer layer is pressure-bonded to the uneven surface of a mold such as a stamper, it can have flexibility to closely follow the uneven surface even at room temperature.
- the glass transition temperature when the glass transition temperature is in the range of 15 ° C. to ⁇ 50 ° C., and further in the range of 0 ° C. to ⁇ 40 ° C., the followability becomes high. If the glass transition temperature is too high, a high pressure and a high pressure are required at the time of bonding, leading to a decrease in workability. If it is too low, sufficient hardness after curing cannot be obtained.
- the photocurable transfer layer is designed so that the glass transition temperature after 300mJ / cm ⁇ 2 > ultraviolet irradiation may be 65 degreeC or more.
- the photocurable transfer sheet of the present invention is obtained by uniformly mixing the components of the above-mentioned photocurable composition and kneading them with an extruder, a roll, etc., and then by a film forming method such as a calendar, roll, T-die extrusion, inflation, etc. It can be manufactured by forming a film into a predetermined shape. Preferably, it forms into a film on the surface of the easily bonding layer of a transparent film, and forms a photocurable transfer layer. More preferably, the photocurable adhesive film-forming method of the present invention is obtained by uniformly mixing and dissolving each constituent component in a good solvent, and then applying this solution to a separator precisely coated with silicone or fluororesin. , A gravure roll method, a Myer bar method, a lip die coating method or the like, and a method of forming a film by drying on a solvent and drying a solvent.
- the thickness of the photocurable transfer sheet is preferably 1 to 1200 ⁇ m, particularly preferably 5 to 500 ⁇ m.
- the thickness is preferably 5 to 300 ⁇ m (preferably 150 ⁇ m or less). If the thickness is less than 1 ⁇ m, the sealing property is inferior. On the other hand, if the thickness is more than 1000 ⁇ m, the thickness of the obtained molded body increases, which may cause problems in housing, assembly, and the like of the molded body.
- the thickness of the photo-curable transfer layer is preferably 1 to 300 ⁇ m, particularly 3 to 100 ⁇ m.
- the release sheet When providing a release sheet on the photocurable transfer layer constituting the photocurable transfer sheet of the present invention, the release sheet generally has a release layer having a low surface tension such as silicone on a plastic film.
- a release layer composed of a condensation reaction product of a polysiloxane having a hydroxyl group and a hydrogenated polysiloxane, or a polysiloxane having an unsaturated double bond group (preferably a vinyl group) (preferably dimethylpolysiloxane) and hydrogen
- a release layer formed from a modified polysiloxane preferably dimethylpolysiloxane.
- plastic film for the release sheet examples include polyester resins such as polyethylene terephthalate, polycyclohexylene terephthalate, and polyethylene naphthalate, polyamide resins such as nylon 46, modified nylon 6T, nylon MXD6, and polyphthalamide, polyphenylene sulfide, and polythioether.
- polyester resins such as polyethylene terephthalate, polycyclohexylene terephthalate, and polyethylene naphthalate
- polyamide resins such as nylon 46, modified nylon 6T, nylon MXD6, and polyphthalamide
- polyphenylene sulfide examples include polythioether.
- ketone resins such as sulfone, sulfone resins such as polysulfone and polyethersulfone, polyether nitrile, polyarylate, polyetherimide, polyamideimide, polycarbonate, polymethyl methacrylate, triacetyl cellulose, polystyrene, polyvinyl
- a transparent resin film mainly composed of an organic resin such as chloride can be used.
- polycarbonate, polymethyl methacrylate, polyvinyl chloride, polystyrene, and polyethylene terephthalate films can be suitably used, and polyethylene terephthalate films are particularly preferable.
- the thickness is preferably 10 to 200 ⁇ m, particularly preferably 30 to 100 ⁇ m.
- the photocurable transfer sheet of the present invention is preferably annealed.
- the annealing treatment is preferably performed by storing the transfer sheet at a temperature of 30 to 100 ° C., particularly 40 to 70 ° C., for 1 hour to 30 days, particularly 10 hours to 10 days.
- the transfer sheet is preferably annealed in a roll state (a wound state).
- any photocurable resin composition may be used as a product for forming a concavo-convex pattern using the photocurable transfer sheet of the present invention as an intermediate stamper.
- a liquid composition that can be used in the nanoimprint process method is preferred.
- the viscosity is preferably 10 to 10,000 cps.
- the photocurable resin composition is preferably a composition containing a photocurable resin and a photoinitiator.
- photocurable resin examples include urethane acrylate, polyester acrylate, epoxy acrylate, epoxy resin, imide-based oligomer, and polyene / thiol-based oligomer.
- Urethane acrylates include, for example, diisocyanates such as hexamethylene diisocyanate, isophorone diisocyanate, methylene bis (4-cyclohexyl isocyanate), trimethylhexamethylene diisocyanate, tolylene diisocyanate, 4,4-diphenylmethane diisocyanate, xylylene diisocyanate, and poly (propylene oxide).
- diisocyanates such as hexamethylene diisocyanate, isophorone diisocyanate, methylene bis (4-cyclohexyl isocyanate), trimethylhexamethylene diisocyanate, tolylene diisocyanate, 4,4-diphenylmethane diisocyanate, xylylene diisocyanate, and poly (propylene oxide).
- Polyols such as diol, poly (propylene oxide) triol, poly (tetramethylene oxide) diol, ethoxylated bisphenol A and 2-hydroxyethyl acrylate 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, glycidol dimethacrylate, pentaerythritol tri Hydroxy acrylates such as acrylate Obtained by reacting, those having an acryloyl group and a urethane bond as a functional group in the molecule.
- polyester acrylate examples include polyester acrylate composed of phthalic anhydride, propylene oxide and acrylic acid, polyester acrylate composed of adipic acid, 1,6-hexanediol and acrylic acid, trimellitic acid, diethylene glycol and acrylic acid. And polyester acrylate.
- the epoxy acrylate is synthesized by reaction of an epoxy compound such as epichlorohydrin and acrylic acid or methacrylic acid.
- an epoxy compound such as epichlorohydrin and acrylic acid or methacrylic acid.
- bisphenol A type epoxy acrylate and bisphenol S synthesized by reaction of bisphenol A, epichlorohydrin and acrylic acid.
- Bisphenol S-type epoxy acrylate synthesized by reaction of chlorophenol, epichlorohydrin and acrylic acid bisphenol F-type epoxy acrylate synthesized by reaction of bisphenol F, epichlorohydrin and acrylic acid, synthesis by reaction of phenol novolac, epichlorohydrin and acrylic acid And phenol novolac type epoxy acrylate.
- epoxy resin examples include bisphenol type epoxy resins such as bisphenol A type epoxy resin, bisphenol F type epoxy resin, bisphenol AD type epoxy resin, and bisphenol S type epoxy resin; phenol novolac type epoxy resin, cresol novolak type epoxy resin and the like.
- examples include novolak-type epoxy resins; aromatic epoxy resins such as trisphenolmethane triglycidyl ether, and hydrogenated products and brominated products thereof.
- a photoradical polymerization initiator and a photocationic polymerization initiator are preferable.
- the photoradical polymerization initiator for example, 4- (2-hydroxyethoxy) phenyl (2-hydroxy-2-) Propyl) ketone, ⁇ -hydroxy- ⁇ - ⁇ '-dimethylacetophenone, methoxyacetophenone, acetophenone derivatives such as 2,2-dimethoxy-2-phenylacetophenone; benzoin ether compounds such as benzoin ethyl ether and benzoin propyl ether; benzyldimethyl Ketal derivatives such as ketals; halogenated ketones, acyl phosphine oxides, acyl phosphonates, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropan-1-one, 2-benzyl-2 -N, N-dimethylamino- 1- (4-morpholinophenyl)
- photocationic polymerization initiator examples include iron-allene complex compounds, aromatic diazonium salts, aromatic iodonium salts, aromatic sulfonium salts, onium salts, pyridinium salts, aluminum complexes / silanol salts, trichloromethyltriazine derivatives, and the like. It is done.
- Examples of the counter anion of the onium salt or pyridinium salt include SbF 6 ⁇ , PF 6 ⁇ , AsF 6 ⁇ , BF 4 ⁇ , tetrakis (pentafluoro) borate, trifluoromethane sulfonate, methane sulfonate, trifluoro Examples include acetate, acetate, sulfonate, tosylate, and nitrate.
- the addition amount of the photopolymerization initiator (G) is generally 0.1 to 15 parts by weight, preferably 0.5 to 10 parts by weight with respect to 100 parts by weight of the photocurable resin.
- a reactive diluent may be added to the photocurable resin composition.
- the reactive diluent include 1,4-butanediol diacrylate, 1,6-hexanediol diacrylate, neopentyl, and the like.
- Glycol diacrylate 2- (2-ethoxyethoxy) ethyl acrylate, tetrahydrofurfuryl acrylate, 2-phenoxyethyl acrylate, diethylene glycol diacrylate, tetraethylene glycol diacrylate, 1,3-butylene glycol diacrylate, tripropylene glycol diacrylate , Trimethylolpropane triacrylate, pentaerythritol tetraacrylate, and hydroxypivalic acid neopentyl glycol diacrylate.
- the photo-curable resin composition further includes photopolymerization initiation assistants, thermal polymerization inhibitors, fillers, adhesion-imparting agents, thixotropic agents, plasticizers, colorants, etc. that are generally added as necessary. May be added.
- the photocurable transfer sheet and the photocurable resin of the product are cured, many light sources that emit light in the ultraviolet to visible region can be used as the light source, for example, ultrahigh pressure, high pressure, low pressure mercury lamp, Examples thereof include lamps, xenon lamps, halogen lamps, mercury lamps, carbon arc lamps, incandescent lamps, and laser beams.
- the irradiation time is not generally determined depending on the type of the lamp and the intensity of the light source, but is about 0.1 to several tens of seconds, preferably 0.5 to several seconds.
- the ultraviolet irradiation amount is preferably 300 mJ / cm 2 or more.
- the laminate may be preheated to 30 to 80 ° C. and irradiated with ultraviolet rays.
- the mixture of each photocurable composition was uniformly dissolved and kneaded, and coated on the entire surface of a transparent film (trade name HPE, manufactured by Teijin DuPont Films; width 300 mm, length 300 m, thickness 75 ⁇ m) and dried.
- a transparent film trade name HPE, manufactured by Teijin DuPont Films; width 300 mm, length 300 m, thickness 75 ⁇ m
- a 25 ⁇ m thick photocurable transfer layer is formed
- a release sheet (trade name A31, manufactured by Teijin DuPont Films; width 300 mm, length 300 m, thickness 50 ⁇ m) is attached to the opposite side of the sheet, and rolled up into a roll shape.
- a full edge type roll (diameter 260 mm) of a photocurable transfer sheet was obtained.
- the transparent film comprises an easy-adhesion layer (polyester / acrylic resin mixture, layer thickness 0.2 ⁇ m) on a PET film (75 ⁇ m).
- the alicyclic group-containing monomer unit content T ((((alicyclic group-containing monomer unit content P / 100) ⁇ alicyclic group-containing polymer mass) / photocurable composition total mass) ⁇ 100) is shown in Table 2. That's right.
- Liquid photocurable resin composition (resin PAK-1 for UV nanoimprint (manufactured by Toyo Gosei Co., Ltd.)) and photocurable resin composition TMP-A (TMP-A (manufactured by Kyoeisha Chemical Co., Ltd.) + IRGACURE-651 (mass ratio 99: Concavity and convexity patterns were respectively formed on the photocurable resin layer comprising the mixture 1)).
- Molding device Flat plate press (0.5 MPa x 5 seconds) UV irradiation: 300 mJ / cm 2 ⁇ 10 seconds Mold pattern: 20 mm square (transfer conditions to photocurable resin layer) Liquid photocurable resin layer formation: Spin coat molding device: Roll laminator UV irradiation: 350 mJ / cm 2 ⁇ 3 seconds Mold pattern: 20 mm square
- A The depth of the transferred uneven pattern is 450 nm or more at all locations.
- ⁇ There is a portion where the depth of the transferred uneven pattern is 400 to 450 nm.
- X There exists a location where the depth of a transfer uneven
- (Iii) Workability The peeling work of the release sheet of the photocurable transfer sheet was evaluated as follows. ⁇ : The release sheet can be completely peeled without being disturbed. ⁇ : The photocurable transfer layer does not migrate to the release sheet, but undulations and streaks occur on the skin of the release sheet. X: Transition of the photocurable transfer layer to the release sheet occurs, resulting in uneven layer thickness and stringing.
- A One type of photocurable resin is O, and the other type of photocurable resin is ⁇ .
- ⁇ Both of the two types of photocurable resins are ⁇ .
- X Both two types of photocurable resins are x.
- SEM scanning microscope
- Examples 1 to 9 using photocurable compositions containing polymers 2 to 6 having an alicyclic group-containing (meth) acrylate repeating unit, mold release property and intermediate stamper releasability, transfer property, and intermediate stamper The release properties (overall evaluation) and transferability between the photocurable resin layer and the photocurable resin layer were ⁇ or more.
- Comparative Examples 1 and 2 which do not contain a polymer having an alicyclic group-containing (meth) acrylate repeating unit had good mold releasability and transferability between the mold and the intermediate stamper. The releasability with the curable resin layer was poor.
- the comparative example 2 uses the monomer which has an alicyclic group for a reactive diluent, the mold release improvement effect was not recognized.
- the alicyclic group-containing (meth) acrylate repeating unit is an alicyclic hydrocarbon group (isobornyl group, cyclohexyl group).
- the releasability was better.
- Examples 1 to 4, 6, 7, and 9 have better releasability than Example 8 in which the alicyclic group-containing monomer content T is 28.2, and the alicyclic group-containing monomer content is higher. It was confirmed that the releasability was further improved when the rate T was 32 to 44% by mass.
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Abstract
Description
本発明の光硬化性転写シートの好ましい態様は以下の通りである。
(2)前記脂環基を有する(メタ)アクリレート繰り返し単位の含有率が、前記光硬化性組成物の乾燥質量に対して32~44質量%である。
(3)前記反応性希釈剤が、脂環基を有するモノマーを含む。
(4)前記脂環基を有するモノマーが、ジメチロールトリシクロデカン基又はイソボルニル基を有するモノマーである。
(1)表面に微細な凹凸パターンを有する金型の表面を、請求項1~5のいずれか1項に記載の光硬化性転写シートの転写層に、当該金型の凹凸パターン面が、当該転写層の表面に接触するように裁置、押圧して、転写層の表面が凹凸パターン表面に沿って密着した積層体を形成する工程;
(2)金型を有する積層体の転写層を紫外線照射により硬化させる工程、及び
(3)金型を除去することにより、当該転写層の表面に微細な反転凹凸パターンを形成する工程;を含む凹凸パターンの形成方法によっても達成される。 この方法においては、本発明の光硬化性転写シートを用いて、金型の表面の微細な凹凸パターンを転写しているので、光硬化性転写シートと金型との離型性が良好で、金型に転写層の一部が付着することなく、欠陥のない反転凹凸パターンを転写層に形成することができる。
(4)請求項6に記載の方法により、前記金型の凹凸パターンの反転凹凸パターンが形成された光硬化性転写シート(中間スタンパ)の微細な反転凹凸パターンの表面を、基板上に形成された光硬化性樹脂組成物からなる光硬化性樹脂層に、該中間スタンパの反転凹凸パターン面が光硬化性樹脂層の表面に接触するように裁置、押圧して、光硬化性樹脂層の表面が反転凹凸パターン表面に沿って密着した積層体を形成する工程;
(5)中間スタンパを有する積層体の光硬化性樹脂層を紫外線照射により硬化させる工程;及び
(6)中間スタンパを除去することにより、光硬化性樹脂層の表面に前記金型と同一の微細な凹凸パターンを形成する工程;を含む凹凸パターンの形成方法によっても達成される。
(1)前記光硬化性樹脂組成物が液状である。本発明の方法においては、特に液状の光硬化性樹脂組成物であっても離型性が良好であり、有効である。
(2)前記金型がスタンパである。本発明の方法は、ナノインプリントプロセス法に使用するスタンパを用いた凹凸パターンの形成に有効である。
本発明における光硬化性転写層11は、金型(好ましくはスタンパ)の微細凹凸パターン表面を押圧することにより精確に転写できるように、加圧により変形し易い層であるとともに、硬化後における金型との離型性に優れ、更に中間スタンパとして使用した場合には、凹凸パターンが転写された製品の光硬化性樹脂(特にラジカル硬化型の紫外線硬化性樹脂)との離型性に優れており、且つ転写性に優れている。
(1)光硬化性組成物のポリマー中の脂環基を有する(メタ)アクリレート繰り返し単位の含有率(本発明において、「脂環基含有モノマー単位含有率P」とも言う)を、光硬化性組成物のポリマーの調製に用いる脂環基含有モノマー質量及び総モノマー質量から、式(I)により算出する。
脂環基含有モノマー単位含有率P=
(脂環基含有モノマー質量/総モノマー質量)×100(%)・・・(I)
(2)脂環基含有モノマー単位含有率Tを、脂環基含有モノマー単位含有率P、光硬化性組成物に用いる脂環基含有ポリマー質量及び光硬化性組成物総質量から、式(II)により算出する。
脂環基含有モノマー単位含有率T=
(((脂環基含有モノマー単位含有率P/100)×脂環基含有ポリマー質量)/光硬化性組成物総質量)×100(%)・・・(II)
一般に、光硬化性転写層11を形成する光硬化性組成物のポリマーは、ガラス転移温度(Tg)が80℃以上のポリマーであることが好ましい。これにより、金型の微細凹凸パターンが容易に転写でき、硬化も高速で行うことができる。また硬化された形状も高いTgを有するのでその形状が変わることなく長期に維持され得る。ガラス転移温度が80℃以上のポリマーとしては、重合性官能基を有することが、反応性希釈剤と反応が可能となり硬化の高速化に有利である。またヒドロキシル基を有することにより、光硬化性転写層11にジイソシアネートを含ませることで、ポリマーを僅かに架橋させることが可能となり、転写層のしみ出し、層厚変動が大きく抑えられた層とするのに特に有利である。ジイソシアネートは、ヒドロキシル基を有さないポリマーでもある程度、上記の効果を有する。
1種又は複数種の(メタ)アクリルレートモノマー(上記脂環基を有する(メタ)アクリル酸エステルの少なくとも1種を含む)と、グリシジル基を1個かつ重合性官能基を1個有する化合物(好ましくはグリシジル(メタ)アクリレート)或いは重合性官能基を有するカルボン酸とを、ラジカル重合開始剤と有機溶剤の存在下で溶液重合法などの公知の方法にて反応させて共重合体であるグリシジル基含有アクリル樹脂(a)又はカルボキシル基含有アクリル樹脂(b)を得る。
本発明において、光硬化性転写組成物に含まれる光重合性官能基を有する反応性希釈剤(モノマー及びオリゴマー)としては以下のものが挙げられる。例えば、(メタ)アクリルモノマー類としては、ジメチロールトリシクロデカンジ(メタ)アクリレート、イソボルニル(メタ)アクリレート、トリシクロデカンモノ(メタ)アクリレート、ジシクロペンテニルオキシエチル(メタ)アクリレート、1,6-ヘキサンジオールジ(メタ)アクリレート、2-ヒドロキシエチル(メタ)アクリレート、2-ヒドロキシプロピル(メタ)アクリレート、4-ヒドロキシブチル(メタ)アクリレート、2-ヒドロキシ-3-フェニルオキシプロピル(メタ)アクリレート、2-エチルヘキシル(メタ)アクリレート、2-エチルヘキシルポリエトキシ(メタ)アクリレート、ベンジル(メタ)アクリレート、フェニルオキシエチル(メタ)アクリレート、テトラヒドロフルフリル(メタ)アクリレート、アクリロイルモルホリン、N-ビニルカプロラクタム、o-フェニルフェニルオキシエチル(メタ)アクリレート、2-ヒドロキシ-3-アクリロイロキシプロピルメタクリレート、ネオペンチルグリコールジ(メタ)アクリレート、ネオペンチルグリコールジプロポキシジ(メタ)アクリレート、ヒドロキシピバリン酸ネオペンチルグリコールジ(メタ)アクリレート、ノナンジオールジ(メタ)アクリレート、グリセリンジアクリレート、グリセリンアクリレートメタクリレート、グリセリンジメタクリレート、トリメチロールプロパンジアクリレート、トリメチロールプロパンアクリレートメタクリレート、トリメチロールプロパンジメタクリレート、トリメチロールプロパントリ(メタ)アクリレート、ペンタエリスリトールトリ(メタ)アクリレート、ペンタエリスリトールテトラ(メタ)アクリレート、トリス〔(メタ)アクリロキシエチル〕イソシアヌレート、ジトリメチロールプロパンテトラ(メタ)アクリレート等を挙げることができる。また、(メタ)アクリレートオリゴマー類としては、ポリオール化合物(例えば、エチレングリコール、プロピレングリコール、ネオペンチルグリコール、1,6-ヘキサンジオール、3-メチル-1,5-ペンタンジオール、1,9-ノナンジオール、2-エチル-2-ブチル-1,3-プロパンジオール、トリメチロールプロパン、ジエチレングリコール、ジプロピレングリコール、ポリプロピレングリコール、1,4-ジメチロールシクロヘキサン、ビスフェノールAポリエトキシジオール、ポリテトラメチレングリコール等のポリオール類、前記ポリオール類とコハク酸、マレイン酸、イタコン酸、アジピン酸、水添ダイマー酸、フタル酸、イソフタル酸、テレフタル酸等の多塩基酸又はこれらの酸無水物類との反応物であるポリエステルポリオール類、前記ポリオール類とε-カプロラクトンとの反応物であるポリカプロラクトンポリオール類、前記ポリオール類と前記、多塩基酸又はこれらの酸無水物類のε-カプロラクトンとの反応物、ポリカーボネートポリオール、ポリマーポリオール等)と、有機ポリイソシアネート(例えば、トリレンジイソシアネート、イソホロンジイソシアネート、キシリレンジイソシアネート、ジフェニルメタン-4,4'-ジイソシアネート、ジシクロペンタニルジイソシアネート、ヘキサメチレンジイソシアネート、2,4,4'-トリメチルヘキサメチレンジイソシアネート、2,2',4-トリメチルヘキサメチレンジイソシアネート等)と水酸基含有(メタ)アクリレート(例えば、2-ヒドロキシエチル(メタ)アクリレート、2-ヒドロキシプロピル(メタ)アクリレート、4-ヒドロキシブチル(メタ)アクリレート、2-ヒドロキシ-3-フェニルオキシプロピル(メタ)アクリレート、シクロヘキサン-1,4-ジメチロールモノ(メタ)アクリレート、ペンタエリスリトールトリ(メタ)アクリレート、グリセリンジ(メタ)アクリレート等)の反応物であるポリウレタン(メタ)アクリレート、ビスフェノールA型エポキシ樹脂、ビスフェノールF型エポキシ樹脂等のビスフェノール型エポキシ樹脂と(メタ)アクリル酸の反応物であるビスフェノール型エポキシ(メタ)アクリレート等を挙げることができる。これら光重合可能な官能基を有する化合物は1種又は2種以上、混合して使用することができる。
本発明において、光硬化性組成物のポリマーと反応性希釈剤との質量比は、20:80~80:20、特に30:70~70:30の範囲が好ましい。
本発明において、透明フィルム12のポリマーフィルム12bは、本発明の光硬化性転写シート10に使用可能な透明性や物性があれば、どのようなものでも良い。好ましくはポリエステルフィルムである。このポリエステルは、芳香族二塩基酸又はそのエステル形成性誘導体とジオール又はそのエステル形成性誘導体とから合成される線状飽和ポリエステルである。
次に、上記光硬化性転写シート10を用いて、本発明の微細凹凸パターンの形成方法について、図面を参照しながら詳細に説明する。一般にナノインプリントプロセス法もこの微細凹凸パターンの形成方法のように行うことができる。
光硬化性転写層を形成する光硬化性組成物に含まれる、光重合開始剤としては、公知のどのような光重合開始剤でも使用することができるが、配合後の貯蔵安定性の良いものが望ましい。このような光重合開始剤としては、例えば、アセトフェノン系、ベンジルジメチルケタールなどのベンゾイン系、ベンゾフェノン系、イソプロピルチオキサントン、2-4-ジエチルチオキサントンなどのチオキサントン系、その他特殊なものとしては、メチルフェニルグリオキシレートなどが使用できる。特に好ましくは、2-ヒドロキシ-2-メチル-1-フェニルプロパン-1-オン、1-ヒドロキシシクロヘキシルフェニルケトン、2-メチル-1-(4-(メチルチオ)フェニル)-2-モルホリノプロパン-1、ベンゾフェノン等が挙げられる。これら光重合開始剤は、必要に応じて、4-ジメチルアミノ安息香酸のごとき安息香酸系又は、第3級アミン系などの公知慣用の光重合促進剤の1種または2種以上を任意の割合で混合して使用することができる。また、光重合開始剤のみの1種または2種以上の混合で使用することができる。光硬化性組成物(不揮発分)中に、光重合開始剤を一般に0.1~20質量%、特に1~10質量%含むことが好ましい。
本発明において、光硬化性転写層を形成する光硬化性組成物中に硬化剤としてジイソシアネートを添加する場合は、トリレンジイソシアネート(TDI)、イソホロンジイソシアネート、キシリレンジイソシアネート、ジフェニルメタン-4,4-ジイソシアネート、ジシクロペンタニルジイソシアネート、ヘキサメチレンジイソシアネート、2,4,4’-トリメチルヘキサメチレンジイソシアネート、2,2’,4-トリメチルヘキサメチレンジイソシアネートを使用することができる。またトリメチロールプロパンのTDI付加体等の3官能以上のイソシアネート化合物等のポリイソシアネートシアネートも使用することができる。これらの中でトリメチロールプロパンのヘキサメチレンジイソシアネート付加体が好ましい。
本発明において、光硬化性転写層を形成する光硬化性組成物には、更に、所望により下記の熱可塑性樹脂及び他の添加剤を添加することが好ましい。
本発明の光硬化性転写シートを構成する光硬化性転写層に剥離シートを設ける場合、剥離シートは一般にプラスチックフィルム上に、シリコーン等の表面張力の低い剥離層を有する。例えば、ヒドロキシル基を有するポリシロキサンと水素化ポリシロキサンとの縮合反応生成物からなる剥離層、或いは不飽和2重結合基(好ましくはビニル基)を有するポリシロキサン(好ましくはジメチルポリシロキサン)と水素化ポリシロキサン(好ましくはジメチルポリシロキサン)から形成される剥離層等を挙げることができる。
本発明の方法において、本発明の光硬化性転写シートを中間スタンパとして、凹凸パターンを形成する製品の光硬化性樹脂組成物はどのようなものでも良い。特にナノインプリントプロセス法に使用できる液状組成物が好ましい。液状組成物の場合、粘度は10~10000cpsが好ましい。光硬化性樹脂組成物は光硬化性樹脂と光開始剤を含む組成物が好ましい。
表1に示したモノマー成分の配合比(モル比)で常法により重合反応を行い、表1に示した重量平均分子量(Mw)、脂環基含有モノマー単位含有率P((脂環基含有モノマー質量/総モノマー質量)×100(%))のポリマー1~6を調整した。なお、脂環基を有するモノマーとして、イソボルニルメタクリレート(モノマーC)、シクロヘキシルメタクリレート(モノマーD)、テトラヒドロフルフリルメタクリレート(モノマーE)を用いた。
(1)で調製したポリマーを用いて、表2に示した配合の実施例1~9、及び比較例1~2の光硬化性組成物による光硬化性転写シートを作製した。
実施例1~8、及び比較例1~4の光硬化性転写シートを用いて、図4に示した凹凸パターン形成工程を行った。即ち、微細な凹凸パターンを有するニッケル製スタンパ(パターン形状:ライン/スペース=1μm/1μm、深さ500nm)を用い、各光硬化性転写シートを中間スタンパとして、シリコン基板上に形成した2種類の液状光硬化性樹脂組成物(UVナノインプリント用樹脂PAK-1(東洋合成社製)、及び光硬化性樹脂組成物TMP-A(TMP-A(共栄社化学社製)+IRGACURE-651(質量比99:1で混合))からなる光硬化性樹脂層にそれぞれ凹凸パターンを形成した。成型条件は以下の通りである。
成型装置:平板プレス(0.5MPa×5秒)
UV照射:300mJ/cm2×10秒
モールドパターン:20mm角
(光硬化性樹脂層への転写条件)
液状光硬化性樹脂層形成:スピンコート
成型装置:ロールラミネーター
UV照射:350mJ/cm2×3秒
モールドパターン:20mm角
(中間スタンパへの転写の評価)
(i)離型性
転写成型後、光硬化性転写シートを90°剥離で引っ張り上げ、以下のように評価した。
○:面内に目視で剥離欠陥がなく、剥離強度が10gf/25mm以下である。
△:面内に目視で剥離欠陥がなく、剥離強度が10gf/25mmより上である。
×:剥離時に目視で欠陥が発生。
(ii)転写性
離型性の評価が△以上の中間スタンパの凹凸パターンの垂直破断面を走査型顕微鏡(SEM)(倍率2万倍)で観察し、以下のように評価した。
○:転写凹凸パターンの深さが全ての箇所で450nm以上である。
△:転写凹凸パターンの深さが400~450nmの箇所がある。
×:転写凹凸パターンの深さが400nm以下の箇所がある。
(iii)作業性
光硬化性転写シートの剥離シートの剥離作業について以下のように評価した。
○:剥離シートの肌が乱れず完全に剥離できる。
△:光硬化性転写層の剥離シートへの移行はないが、剥離シートの肌にうねりやスジが発生する。
×:光硬化性転写層の剥離シートへの移行が生じ、層厚ムラや糸引きが発生する。
(光硬化性樹脂層への転写の評価)
(i)離型性
・各光硬化性樹脂層の評価
転写成型後、光硬化性転写シートを90°剥離で引っ張り上げ、2種類の光硬化性樹脂層について以下のように評価した。
○:面内に目視で剥離欠陥がなく、剥離強度が10gf/25mm以下である。
△:面内に目視で剥離欠陥がなく、剥離強度が10gf/25mmより上である。
×:剥離時に目視で欠陥が発生。
・総合評価
◎:2種の光硬化性樹脂層が共に○である。
○:1種の光硬化性樹脂が○であり、もう1種の光硬化性樹脂が△である。
△:1種の光硬化性樹脂が○であり、もう1種の光硬化性樹脂が×である。
△:2種の光硬化性樹脂が共に△である。
×:2種の光硬化性樹脂が共に×である。
(ii)転写性
離型性の評価が△以上の各光硬化性樹脂層の凹凸パターンの垂直破断面を走査型顕微鏡(SEM)(倍率2万倍)で観察し、以下のように評価した。
○:転写凹凸パターンの深さが全ての箇所で450nm以上である。
△:転写凹凸パターンの深さが400~450nmの箇所がある。
×:転写凹凸パターンの深さが400nm以下の箇所がある。
評価結果を表3に示す。
11、31 光硬化性転写層
11c、31c 光硬化性転写層(硬化後)
12、32 透明フィルム
12a 易接着層
12b ポリマーフィルム
13、33 剥離シート
14 スタンパ
15、40 基板
16、41 光硬化性樹脂層
20 中間スタンパ
34 スタンパ部
35、45 UV透過型圧着部
36a 送りロール
36b、36f 巻き取りロール
36c、36d、36e 案内ロール
37、47 UVランプ
Claims (9)
- 加圧により変形可能で、ポリマーと光重合性官能基を有する反応性希釈剤を含む光硬化性組成物からなる光硬化性転写層を有する光硬化性転写シートであって、
前記ポリマーが、脂環基を有する(メタ)アクリレート繰り返し単位を含むアクリル樹脂からなることを特徴とする光硬化性転写シート。 - 前記脂環基を有する(メタ)アクリレート繰り返し単位が、イソボルニル基及び/又はシクロヘキシル基を有する(メタ)アクリレート繰り返し単位である請求項1に記載の光硬化性転写シート。
- 前記脂環基を有する(メタ)アクリレート繰り返し単位の含有率が、前記光硬化性組成物の乾燥質量に対して32~44質量%である請求項1又は2に記載の光硬化性転写シート。
- 前記反応性希釈剤が、脂環基を有するモノマーを含む請求項1~3のいずれか1項に記載の光硬化性転写シート。
- 前記脂環基を有するモノマーが、ジメチロールトリシクロデカン基又はイソボルニル基を有するモノマーである請求項4に記載の光硬化性転写シート。
- 下記の工程:
(1)表面に微細な凹凸パターンを有する金型の表面を、請求項1~5のいずれか1項に記載の光硬化性転写シートの転写層に、当該金型の凹凸パターン面が、当該転写層の表面に接触するように裁置、押圧して、転写層の表面が凹凸パターン表面に沿って密着した積層体を形成する工程;
(2)金型を有する積層体の転写層を紫外線照射により硬化させる工程、及び
(3)金型を除去することにより、当該転写層の表面に微細な反転凹凸パターンを形成する工程;
を含む凹凸パターンの形成方法。 - 下記の工程:
(4)請求項6に記載の方法により、前記金型の凹凸パターンの反転凹凸パターンが形成された光硬化性転写シート(中間スタンパ)の微細な反転凹凸パターンの表面を、基板上に形成された光硬化性樹脂組成物からなる光硬化性樹脂層に、該中間スタンパの反転凹凸パターン面が光硬化性樹脂層の表面に接触するように裁置、押圧して、光硬化性樹脂層の表面が反転凹凸パターン表面に沿って密着した積層体を形成する工程;
(5)中間スタンパを有する積層体の光硬化性樹脂層を紫外線照射により硬化させる工程;及び
(6)中間スタンパを除去することにより、光硬化性樹脂層の表面に前記金型と同一の微細な凹凸パターンを形成する工程;
を含む凹凸パターンの形成方法。 - 前記光硬化性樹脂組成物が液状である請求項7に記載の方法。
- 前記金型がスタンパである請求項6~8のいずれか1項に記載の方法。
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US (1) | US20120175822A1 (ja) |
EP (1) | EP2479779A4 (ja) |
JP (1) | JP2011066100A (ja) |
KR (1) | KR20120052416A (ja) |
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EP2479779A1 (en) | 2012-07-25 |
CN102498544B (zh) | 2015-06-24 |
US20120175822A1 (en) | 2012-07-12 |
EP2479779A4 (en) | 2015-10-07 |
CN102498544A (zh) | 2012-06-13 |
KR20120052416A (ko) | 2012-05-23 |
JP2011066100A (ja) | 2011-03-31 |
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