JPWO2015002316A1 - Insulation pattern forming method - Google Patents

Abstract

It is an object of the present invention to provide a method for forming an insulating pattern that easily forms a desired pattern when the insulating layer (3) is patterned using an inkjet method. In the method for forming an insulating pattern according to the present invention, when the insulating layer (3) is patterned by the inkjet method, the insulating layer forming ink is applied to the base material (1) so as to satisfy the following conditions. The insulating layer forming ink has a phase change mechanism of any one of hot melt, thixotropy, and gelation. (Viscosity after landing on the base material) / (Viscosity upon emission) ≧ 100

Description

  The present invention relates to a method for forming an insulating pattern, and more particularly to a method for forming an insulating pattern in which an insulating layer is patterned using an inkjet method.

  In the manufacture of various electronic components such as semiconductors, light emitting elements, and electronic circuits, there is an increasing demand for imparting a desired pattern to an insulating layer.

  The patterning of the insulating layer is performed by removing an unnecessary portion using a photolithography method after applying an insulating material over the entire surface. However, this method complicates the process and causes a lot of material loss.

  In Patent Document 1, an insulating layer is patterned with an ink that has been thickened by adding an inorganic or organic filler using a screen printing method. However, these fillers tend to cause insulation failure, and thus have a limit. .

  In Patent Documents 2 and 3, an insulating layer is patterned using an ink jet method.

JP 2003-113338 A JP 2003-309369 A JP 2010-231287 A

  When patterning an insulating layer using the inkjet method, for example, when forming the insulating layer across different members, the ink flows to the highly wettable member side due to the difference in wettability of each member with respect to ink. Therefore, there is room for further improvement in forming a desired pattern.

  The technique described in Patent Document 2 does not sufficiently solve such a problem.

  The technique described in Patent Document 3 describes that a desired pattern can be formed by adjusting the ink application amount according to the wettability of each member. For example, if the difference in wettability of each member increases, There is a limit to the prevention. Also, for example, ink patterning cannot be prevented when patterning across uneven members.

  Accordingly, an object of the present invention is to provide a method for forming an insulating pattern that easily forms a desired pattern when an insulating layer is patterned using an ink jet method.

  Other problems of the present invention will become apparent from the following description.

  The above problems are solved by the following inventions.

1. A method for forming an insulating pattern in which an insulating layer forming ink is applied to a substrate so as to satisfy the following conditions when patterning an insulating layer by an inkjet method.
(Viscosity after landing on the base material) / (Viscosity upon emission) ≧ 100

  2. 2. The insulating pattern forming method according to 1, wherein the insulating layer forming ink has a phase change mechanism of any one of hot melt, thixotropy, and gelation.

  3. 3. The method for forming an insulating pattern according to 1 or 2, wherein the insulating layer forming ink has a curing mechanism by polymerization or cross-linking between molecules.

  4). 4. The method for forming an insulating pattern according to 3 above, wherein the insulating layer forming ink contains an active energy ray-curable composition and an oil gelling agent.

  5). 5. The method for forming an insulating pattern according to 4, wherein the oil gelling agent includes at least one curable oil gelling agent.

  6). 6. The method for forming an insulation pattern according to 4 or 5, wherein the active energy ray-curable composition contains an acrylic monomer.

  7). The said insulating layer is a formation method of the insulating pattern in any one of said 1-6 formed ranging over a different member.

  8). The said insulating layer is a formation method of the insulating pattern in any one of said 1-7 formed ranging over an uneven | corrugated member.

  9. 9. The method for forming an insulating pattern according to any one of 1 to 8, wherein the insulating layer forms a base of a bridge wiring of a touch panel.

  10. 10. The method for forming an insulating pattern according to any one of 1 to 9, wherein a functional material is further patterned on the insulating layer.

  11. 11. The method for forming an insulating pattern according to 10, wherein the functional material is a conductive material.

Plan view for explaining an example of a manufacturing method of a matrix type electrode substrate Enlarged view of the main part in FIG. Plan view for explaining an example of a manufacturing method of a matrix type electrode substrate

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

In the method for forming an insulating pattern according to the present invention, when an insulating layer (also referred to as an insulating film) is patterned by an inkjet head method, the insulating layer satisfies the following conditions (hereinafter may be referred to as viscosity changing conditions). A forming ink (hereinafter sometimes simply referred to as an ink) is applied to a substrate.
(Viscosity after landing on the base material) / (Viscosity upon emission) ≧ 100

  The viscosity can be measured using a rotational viscometer. The “viscosity after landing on the substrate” means the ink that reaches before the ink flow (not due to the impact of landing) occurs due to the wetting and spreading of the ink on the substrate. The viscosity can be referred to as a viscosity. Specifically, the viscosity reaches within 1 second after the ink has landed on the substrate.

  The reason why it becomes easy to impart a desired pattern to the insulating layer according to the present invention is not necessarily clear, but for example, since it is easy to obtain the stability of ink ejection, the ink can be applied to the substrate with high accuracy, In addition, it is presumed that the ink applied to the base material is likely to promptly fix the contact line to the base material (pinning) and prevent the ink from flowing.

  According to the present invention, since a desired pattern can be easily formed when patterning an insulating layer, it is possible to suitably prevent the occurrence of insulation failure. For example, the effect of the present invention is particularly significant when the insulating layer is formed over different members or formed over uneven members.

  From the viewpoint of achieving the effects of the present invention more remarkably, in the above viscosity change condition, “(viscosity after landing on the base material) / (viscosity upon emission)” is preferably 200 or more, and is 500 or more. Is more preferable. The “viscosity at the time of emission” is not particularly limited, but is preferably in the range of 3 to 15 mPa · s from the viewpoint of improving the emission stability.

  The viscosity change condition according to the present invention can be appropriately satisfied by, for example, the composition of the ink or the setting of physical conditions such as temperature and humidity when the ink is applied.

  In the present invention, the ink preferably has a phase change mechanism such as hot melt, thixotropy, or gelation. Since the ink exhibits a phase change mechanism from the time of ejection of the ink to after landing, the viscosity change condition according to the present invention can be suitably achieved, and the effect of the present invention becomes remarkable.

  The phase change mechanism by hot melt is a phase change mechanism that shifts from a heated (melted) low viscosity state (during emission) to a high viscosity (after landing) state by cooling. From the viewpoint of suitably expressing the phase change mechanism by hot melt, it is preferable to change the temperature of the ink at the time of emission and after landing. For example, it is preferable to perform either one or both of ink heating at the time of emission and ink cooling after landing.

  In the present invention, when changing the temperature of the ink at the time of emission and after landing, a heater (heating means) for heating the ink filled in the inkjet head, or a cooling means for cooling the substrate A temperature adjusting means such as can be used as appropriate.

  The phase change mechanism by thixotropy starts from a state where viscosity is low under the action of shear stress due to stirring or vibration (during emission), and a state where viscosity increases due to the action of shear stress being reduced or stationary (landing) It is a phase change mechanism that shifts to (after). For example, a phase change mechanism by thixotropy can be developed by appropriately using a shear stress applying means for applying stirring or vibration (fine vibration) to ink filled in an ink jet head.

  The phase change mechanism due to gelation is based on the interaction of the polymer network formed by chemical or physical aggregation, the aggregation structure of fine particles, etc. It is a phase change mechanism in which a structure in which solutes lose their independent motility to form an aggregate and shift to a high viscosity state (after landing). In this case, it is also preferable to include a gelling agent such as an oil gelling agent (described in detail later) in the ink. From the viewpoint of suitably expressing the phase change mechanism by gelation, it is preferable to change the temperature of the ink at the time of emission and after landing. For example, a method in which the ink is heated to a temperature equal to or higher than the sol-gel phase transition temperature at the time of emission and made into a sol, and the ink is cooled to a temperature equal to or lower than the sol-gel phase transition temperature after landing can be preferably used.

  The ink of the present invention preferably has a curing mechanism by, for example, polymerization between molecules (for example, monomers) or crosslinking between molecules (for example, polymers). For example, by containing an active energy ray-curable monomer such as an acrylic monomer in the ink, curing can be performed by irradiating the ink after landing with an active energy ray.

  In general, such a curing mechanism is excellent in stability, but it may be difficult to obtain a sufficient progress speed as compared with the phase change mechanism described above. Therefore, it is preferable that the ink of the present invention has both the above-described phase change mechanism and the above-described curing mechanism. As such an ink, for example, an ink containing an active energy ray-curable composition and a gelling agent such as an oil gelling agent can be preferably used. The active energy ray-curable composition mainly contributes to the above-described curing mechanism, and the gelling agent can mainly contribute to the above-described phase change mechanism by gelation.

  The oil gelling agent referred to in the present invention refers to oil (lipid) that can express the phase change mechanism by gelation described above in the ink.

  In general, a gel becomes a fluid solution (sometimes called a sol) by heating, a thermoreversible gel that returns to the original gel when cooled, and once gelled, it can be reheated even if heated. There is a heat irreversible gel that does not return. The gel formed by the oil gelling agent according to the present invention is preferably a thermoreversible gel.

  The oil gelling agent used in the ink of the present invention may be a high molecular compound or a low molecular compound, but is preferably a low molecular compound from the viewpoint of use in ink.

  Moreover, as the gel structure, a compound in which the oil gelling agent itself can form a fibrous aggregate is preferable. Formation of the fibrous aggregate can be easily confirmed by morphological observation with a transmission electron microscope.

  The oil gelling agent that can be used in the ink of the present invention is specifically described below, but the present invention is not limited to these.

  The ink of the present invention more preferably contains at least one curable oil gelling agent that reacts with the active energy ray-curable composition as an oil gelling agent. By reacting with the curable monomer, an effect of preventing the gelling agent from bleeding out on the surface of the insulating layer is obtained. In particular, when patterning a functional material such as a conductive material on the insulating layer, it becomes easy to obtain adhesion, which is a particularly significant effect.

  As the curable oil gelling agent, specifically, a functional group capable of expressing at least one curing function selected from acrylate, methacrylate, alkene, vinyl, allyl ether, epoxide, oxetane, etc. in the molecular structure. The oil which has can be illustrated preferably.

  Such a curable oil gelling agent can be easily obtained by synthesizing from any oil having a convertible functional group such as a hydroxyl group or a carboxyl group.

  First, an example in which a curable oil gelling agent is synthesized from an oil having a hydroxyl group will be described.

  Preferred examples of the oil having a hydroxyl group include polyethylenes having a hydroxyl group, Gerve alcohols, diols composed of a dimerized alcohol, and the like.

Preferred examples of the polyethylene having a hydroxyl group include, but are not limited to, a polyethylene having a hydroxyl group at the terminal, and the like. However, in the structural formula CH ₃ — (CH ₂ ) _n —CH ₂ OH, Those having an average of 16 to 50 can be preferably used.

  In addition, preferred examples of Gerve alcohols include 2,2-dialkyl-1-ethanols. As the Gerve alcohols, those having a carbon number of 16 to 36 can be preferably used.

  Furthermore, as a diol consisting of a dimerized alcohol, for example, a dimer diol having 36 carbon atoms represented by the following chemical formula commercially available as PRIPOL (registered trademark) 2033 can be exemplified.

  The oil having a hydroxyl group can be preferably used even if it is an isomer having an unsaturated site or a cyclic site in the oil described above.

  These oils having hydroxyl groups preferably react with the carboxyl groups of the carboxylates to produce oil gelling agents having reactive esters.

  The carboxylates are not particularly limited, and those in which the carboxyl groups of the carboxylates are in the form of, for example, an acrylic group or a methacryl group can be preferably used.

  Next, an example in which a curable oil gelling agent is synthesized from an oil having a carboxyl group will be described.

  Preferred examples of the oil having a carboxyl group include polyethylenes having a carboxyl group, compounds in which a hydroxyl group in a carboxy alcohol is substituted with a carboxyl group, dicarboxylic acids composed of a dimerized carboxylic acid, and the like.

Examples of the polyethylene having a carboxyl group include, but are not limited to, a polyethylene having a carboxyl group at a terminal, and the like. However, in the structural formula CH ₃ — (CH ₂ ) _n —COOH, the average of n is The thing of the range of 16-50 can be used preferably.

  Moreover, as an example of the compound which substituted the hydroxyl group in Gerve alcohol with the carboxyl group, the compound etc. which substituted the hydroxyl group in the ethanol part of 2, 2- dialkyl- 1-ethanol can be illustrated preferably, for example. . As these compounds, those having a carbon number of 16 to 36 can be preferably used.

  Furthermore, preferred examples of the dicarboxylic acid composed of the dimerized carboxylic acid include a dimer dicarboxylic acid having 36 carbon atoms represented by the following chemical formula, which is commercially available as PRIPOL (registered trademark) 1009.

  The oil having a carboxyl group can be preferably used even in the oil described above, even if it is an isomer having an unsaturated site or a cyclic site.

  These carboxyl group-containing oils preferably react with the hydroxyl groups of alcohols to produce oil gelling agents with reactive esters.

  As alcohols, 2-allyloxyethanol of Sigma-Aldrich Co. represented by the following chemical formula,

  SR495B (registered trademark) manufactured by Sartomer, represented by the following chemical formula:

  The Dow Chemical Company's TONE (registered trademark) M-101 (R = H, navg = 1) and TONE (registered trademark) M-100 (the following chemical formula: R = H, navg) = 2), TONE (registered trademark) M-201 (in the following chemical formula, R = Me, navg = 1), CD572 (registered trademark) manufactured by Sartomer (in the following chemical formula, R = H, n = 10), and SR604. (Registered trademark) (in the following chemical formula, R = Me, n = 4) and the like can be preferably exemplified.

  As the curable oil gelling agent, commercially available products such as Baker Hughes, Incorporated's Unilin (registered trademark) 350 (acrylate oil) and Clariant's PP-U350a-1 (registered trademark) (curable polypropylene oil) are also preferably used. be able to.

  The oil gelling agent contained in the ink of the present invention is not limited to the above-described curable oil gelling agent, and may be at least one non-curable oil gelling agent.

  The non-curable oil gelling agent refers to a solid oil at room temperature (20 ° C.) among oils that are not substantially cured by free radical polymerization or radiation irradiation.

  Specific examples of the non-curable oil gelling agent are shown below, but the present invention is not limited to these compounds.

  Among the above non-curable oil gelling agents, particularly preferably used compounds are OG-1, OG-2, OG-5 and OG-15.

  The non-curable oil gelling agent is preferably an ester of an acidic oil such as a fatty acid and a monohydric or polyhydric alcohol. Preferred examples of such ester-based non-curable oil gelling agents include stearyl stearate.

  The acid value of such an ester-based non-curable oil gelling agent is preferably in the range of 15 (mg KOH / g) to 100 (mg KOH / g), more preferably 40 (mg KOH / g). The range is 95 (mg KOH / g) or less. The acid value refers to the number of milligrams of potassium hydroxide required to neutralize the acid contained in 1 g of the non-curable oil gelling agent. The acid value measurement, hydrolysis acid value measurement (total acid value measurement) of JIS K 0070 ) Can be measured.

  In the present invention, the total amount of the oil gelling agent including the curable and non-curable oil gelling agent is preferably in the range of 2% by weight to 10% by weight with respect to the total amount of the ink. As a result, the ink ejection stability can be improved, the insulating layer can be easily patterned on the substrate with high accuracy, and the dot height can be adjusted more easily with respect to the dot diameter. Can be controlled more easily. If the amount of the oil gelling agent is less than 2% by weight, the gelation property of the ink may be lowered. If the amount exceeds 10% by weight, the surface hardness of the insulating layer may be weakened.

  Next, the active energy ray-curable composition used for the ink of the present invention will be described.

  As the active energy ray-curable composition, a radical polymerizable compound that is cured by a polymerization reaction by radical active species and a cationic polymerizable compound that is cured by a cationic polymerization reaction by cationic active species can be used.

  First, the radical polymerizable compound will be described.

  The radical polymerizable compound is a compound having an ethylenically unsaturated bond capable of radical polymerization, and may be any compound as long as it has at least one ethylenically unsaturated bond capable of radical polymerization in the molecule. , Oligomers, polymers and the like having a chemical form. Only one kind of radically polymerizable compound may be used, or two or more kinds thereof may be used in combination at an arbitrary ratio in order to improve desired properties.

  Examples of compounds having an ethylenically unsaturated bond capable of radical polymerization include unsaturated carboxylic acids such as acrylic acid, methacrylic acid, itaconic acid, crotonic acid, isocrotonic acid, maleic acid and their salts, esters, urethanes, amides. And radically polymerizable compounds such as unsaturated monomers, acrylonitrile, styrene, various unsaturated polyesters, unsaturated polyethers, unsaturated polyamides, and unsaturated urethanes. Specifically, 2-ethylhexyl acrylate, 2-hydroxyethyl acrylate, butoxyethyl acrylate, carbitol acrylate, cyclohexyl acrylate, tetrahydrofurfuryl acrylate, benzyl acrylate, bis (4-acryloxypolyethoxyphenyl) propane, neopentyl glycol Diacrylate, 1,6-hexanediol diacrylate, ethylene glycol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, tetraethylene glycol diacrylate, polyethylene glycol diacrylate, polypropylene glycol diacrylate, pentaerythritol triacrylate, pentaerythritol Tetraacrylate, dipentaery Acrylic acid derivatives such as lithol tetraacrylate, trimethylolpropane triacrylate, tetramethylolmethane tetraacrylate, oligoester acrylate, N-methylol acrylamide, diacetone acrylamide, epoxy acrylate, methyl methacrylate, n-butyl methacrylate, 2-ethylhexyl methacrylate , Lauryl methacrylate, allyl methacrylate, glycidyl methacrylate, benzyl methacrylate, dimethylaminomethyl methacrylate, 1,6-hexanediol dimethacrylate, ethylene glycol dimethacrylate, triethylene glycol dimethacrylate, polyethylene glycol dimethacrylate, polypropylene glycol dimethacrylate, trimethylol Methacryl derivatives such as tan trimethacrylate, trimethylolpropane trimethacrylate, 2,2-bis (4-methacryloxypolyethoxyphenyl) propane, and other derivatives of allyl compounds such as allyl glycidyl ether, diallyl phthalate, triallyl trimellitate More specifically, Yamashita Junzo, “Crosslinker Handbook”, (1981 Taiseisha); Kato Kiyomi, “UV / EB Curing Handbook (Materials)” (1985, Polymer Publication) ); Rad-Tech Study Group, “Application and Market of UV / EB Curing Technology”, p. 79, (1989, CMC); Eiichiro Takiyama, “Polyester Resin Handbook”, (1988, Nikkan Kogyo Shimbun) Commercially available products described in the above, or radically polymerizable or crosslinkable monomers known in the industry Oligomers and polymers can be used. The amount of the radical polymerizable compound added is preferably 1 to 97% by weight, more preferably 30 to 95% by weight.

  Next, the cationic polymerizable compound will be described.

  Various known cationic polymerizable monomers can be used as the cationic polymerizable compound. For example, JP-A-6-9714, JP-A-2001-31892, JP-A-2001-40068, JP-A-2001-55507, JP-A-2001-310938, JP-A-2001-310937, Examples thereof include epoxy compounds, vinyl ether compounds, oxetane compounds and the like exemplified in JP-A-2001-220526.

  The epoxy compound includes an aromatic epoxide, an alicyclic epoxide, an aliphatic epoxide, and the like. Preferred examples of the aromatic epoxide include a polyhydric phenol having at least one aromatic nucleus or an alkylene oxide adduct thereof and epichlorohydrin. Di- or polyglycidyl ether produced by the reaction of, for example, di- or polyglycidyl ether of bisphenol A or its alkylene oxide adduct, di- or polyglycidyl ether of hydrogenated bisphenol A or its alkylene oxide adduct, and novolak type An epoxy resin etc. are mentioned. Here, examples of the alkylene oxide include ethylene oxide and propylene oxide.

  As the alicyclic epoxide, cyclohexene oxide obtained by epoxidizing a compound having at least one cycloalkane ring such as cyclohexene or cyclopentene ring with a suitable oxidizing agent such as hydrogen peroxide or peracid. Or a cyclopentene oxide containing compound is preferable.

  Preferred aliphatic epoxides include di- or polyglycidyl ethers of aliphatic polyhydric alcohols or alkylene oxide adducts thereof, and typical examples thereof include diglycidyl ether of ethylene glycol, diglycidyl ether of propylene glycol or Diglycidyl ether of alkylene glycol such as diglycidyl ether of 1,6-hexanediol, polyglycidyl ether of polyhydric alcohol such as di- or triglycidyl ether of glycerin or its alkylene oxide adduct, polyethylene glycol or its alkylene oxide adduct Of polyalkylene glycols such as diglycidyl ether, polypropylene glycol or diglycidyl ether of its alkylene oxide adduct Glycidyl ether, and the like. Here, examples of the alkylene oxide include ethylene oxide and propylene oxide.

  Among these epoxides, in view of fast curability, aromatic epoxides and alicyclic epoxides are preferable, and alicyclic epoxides are particularly preferable. In the present invention, one of the epoxides may be used alone, or two or more may be used in appropriate combination.

  Examples of the vinyl ether compound include ethylene glycol divinyl ether, diethylene glycol divinyl ether, triethylene glycol divinyl ether, propylene glycol divinyl ether, dipropylene glycol divinyl ether, butanediol divinyl ether, hexanediol divinyl ether, cyclohexanedimethanol divinyl ether, Di- or trivinyl ether compounds such as methylolpropane trivinyl ether, ethyl vinyl ether, n-butyl vinyl ether, isobutyl vinyl ether, octadecyl vinyl ether, cyclohexyl vinyl ether, hydroxybutyl vinyl ether, 2-ethylhexyl vinyl ether, cyclohexane dimethanol monovinyl ether, n-propyl Pills vinyl ether, isopropyl vinyl ether, isopropenyl ether -O- propylene carbonate, dodecyl vinyl ether, diethylene glycol monovinyl ether, and octadecyl vinyl ether.

  Among these vinyl ether compounds, in consideration of curability, adhesion, and surface hardness, di- or trivinyl ether compounds are preferable, and divinyl ether compounds are particularly preferable. In the present invention, one of the above vinyl ether compounds may be used alone, or two or more thereof may be used in appropriate combination.

  The oxetane compound according to the present invention is a compound having an oxetane ring, and any known oxetane compound as introduced in JP-A Nos. 2001-220526 and 2001-310937 can be used.

  In the oxetane compound according to the present invention, when a compound having 5 or more oxetane rings is used, the viscosity of the ink is increased. Therefore, in the present invention, a compound having 1 to 4 oxetane rings is preferable.

  The ink of the present invention preferably contains at least one photopolymerization initiator.

  As the photopolymerization initiator, any known photopolymerization initiators published in “Application and Market of UV / EB Curing Technology” (CMC Publishing Co., Ltd., edited by Yoneho Tabata / edited by Radtech Research Association) may be used. it can.

  As the radical polymerization initiator, conventionally known photo radical generators such as aryl alkyl ketone, oxime ketone, S-phenyl thiobenzoate, titanocene, aromatic ketone, thioxanthone, benzyl and quinone derivatives, and ketocoumarins can be used. .

  Of these, acylphosphine oxide and acylphosphonate can be preferably used from the viewpoint of sensitivity.

  Specifically, bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide, bis (2,6-dimethoxybenzoyl) -2,4,4-trimethyl-pentylphosphine oxide, and the like are preferable.

  A preferable amount of the photoinitiator is 1 to 10% by weight, particularly preferably 2 to 8% by weight, based on the entire ink composition.

  Specific examples of the cationic polymerization initiator include a photoacid generator and the like. For example, a chemical amplification type photoresist or a compound used for photocationic polymerization is used (edited by Organic Electronics Materials Research Group, “ Organic materials for imaging ", Bunshin Publishing (1993), see pages 187-192). For example, diazonium salts, iodonium salts, sulfonium salts, iron arene complexes, and organic polyhalogen compounds are preferred. Examples of the diazonium salt, iodonium salt, and sulfonium salt include Japanese Patent Publication No. 54-14277, Japanese Patent Publication No. 54-14278, Japanese Patent Publication No. 51-56885, US Pat. No. 3,708,296, And compounds described in the specification of US Pat. No. 3,853,002.

  Examples of the cationic polymerization initiator include aromatic diazonium salts, aromatic sulfonium salts, aromatic iodonium salts, metallocene compounds, silicon compounds / aluminum complexes, and the like.

  In the present invention, a curable oligomer can also be used. More preferable examples of the curable oligomer include acrylic polyesters, acrylic polyethers, acrylic epoxies, urethane acrylic acid, and pentaerythritol tetraacrylate, and one or more of these are used in combination. be able to. Specifically, as acrylic acid oligomers, acrylic polyester oligomers (for example, CN2255 (registered trademark), CN2256 (registered trademark)), urethane acrylate oligomers, acrylic acid epoxy oligomers (for example, CN2204 (registered trademark)) , CN110 (registered trademark)) (all are Sartomer).

  In the present invention, the portion where the insulating layer is provided is not particularly limited, but as described above, the insulating layer is formed over different members or formed over uneven members. In this case, the effect of the present invention is particularly significant.

  Hereinafter, the present invention will be described in more detail by taking as an example the case of forming an insulating layer that forms the base of the bridge wiring of the touch panel.

  For example, a capacitive touch panel has an induction generated in accordance with a change in capacitance based on electrostatic coupling between a plurality of arranged X-axis transparent electrodes and a plurality of Y-axis transparent electrodes and a human finger. The position coordinates on the touch panel are detected using current.

  By arranging the X-axis and Y-axis transparent electrodes on the same plane, it is possible to reduce the thickness of the touch panel, for example. In such a touch panel, when the X-axis transparent electrode and the Y-axis transparent electrode are crossed, an insulating layer is provided in a predetermined region on one transparent electrode (hereinafter sometimes referred to as a first transparent electrode). A configuration in which the bridge wiring of the other transparent electrode (hereinafter sometimes referred to as a second transparent electrode) is straddled over this can be used.

  1 and 3 are plan views for explaining an example of a manufacturing method of a matrix type electrode substrate suitably used for the capacitance type touch panel as described above, and FIG. 2 is an enlarged view of a main part of FIG. FIG.

  As shown in FIG. 1, an electrode pattern 2 including a plurality of first transparent electrodes 21 and a plurality of electrode films 20 which are precursors of a plurality of second transparent electrodes formed later on one surface side of the transparent substrate 1. Form.

  The first transparent electrode 21 is configured by alternately arranging island-like electrode portions 211 that are rectangular in a plan view and connection electrode portions 212 that connect them, and extends in the left-right direction in the drawing. Among the plurality of island-shaped electrode portions 211 extending in the left-right direction, the adjacent island-shaped electrode portions 211 are arranged so that the apex angles are opposed along the left-right direction in the drawing, and the apex angles facing each other Is connected to the connection electrode portion 212 at a portion in the vicinity of.

  On the other hand, the plurality of electrode films 20 have a rectangular shape in a plan view and extend in the vertical direction in the drawing. Among the plurality of electrode films 20 extending in the vertical direction, the adjacent electrode films 20 are arranged so that the apex angles face each other along the left-right direction in the drawing, and the apex angles facing each other are connected to each other. Has been cut without being. Since the cut portion is a portion where a second transparent electrode, which will be described later, and the first transparent electrode 21 intersect, it is referred to as an intersecting portion 23 in this embodiment.

  The electrode film 20 and the island-shaped electrode portions 211 of the first transparent electrode 21 are alternately arranged in the left-right direction and the up-down direction in the drawing. This arrangement may be referred to as a grid arrangement or a checkered arrangement.

  The opposing apex angles of the adjacent electrode films 20 are cut at the intersection 23, but can be electrically connected by a bridge wiring. The patterning of the insulating layer of the present invention is effective in forming the bridge wiring. By such a bridge wiring, a plurality of second transparent electrodes (indicated by reference numeral 22 in FIG. 3) can be formed by being electrically connected as electrode film 20-bridge wiring-electrode film 20. .

  As shown in FIG. 1, the method for forming the plurality of first transparent electrodes 21 and the plurality of electrode films 20 on the transparent substrate 1 is not particularly limited. These formations (patterning) can be simultaneously performed by, for example, a method described below.

  First, using a metal oxide such as ITO, tin oxide, or zinc oxide, a transparent conductive layer (not shown) is formed on one side of the transparent substrate 1 by sputtering or vapor deposition. Next, an etching mask having a pattern corresponding to the plurality of first transparent electrodes 21 and the plurality of electrode films 20 is formed by a screen printing method or a photolithography method, and a portion of the transparent conductive film not covered with the etching mask is formed. The layer is etched with an etching solution such as a ferric chloride aqueous solution or hydrochloric acid, and the plurality of first transparent electrodes 21 and the plurality of electrode films 20 are patterned faithfully to the etching mask. Thereafter, the etching mask is peeled off using an organic solvent or an alkaline solution.

  FIG. 2A is an enlarged view of a main part in which the vicinity of the intersection 23 in FIG. 1 is enlarged.

  In the drawing, when two electrode films 20 that are adjacent to each other in the vertical direction are electrically connected to each other, as shown in FIG. The insulating film 3 is formed on 21 (specifically, the connection electrode portion 212).

  As shown in FIG. 2B, the insulating film 3 is formed across different members such as the transparent substrate 1 and the first transparent electrode 21.

  Furthermore, since the first transparent electrode 21 has a thickness, the insulating film 3 is formed across the uneven member. That is, a step, an inclination, or the like may exist on the surface on which the insulating film 3 is formed.

  In the present invention, the insulating film 3 is patterned by an ink jet method. In that case, the effect of being easy to form a desired pattern is produced by patterning by the inkjet method so as to satisfy the viscosity change condition according to the present invention. As a result, it is possible to suitably prevent the occurrence of insulation failure.

  In forming the insulating film 3, the above-described ink can be suitably used.

  As shown in FIG. 2B, the insulating film 3 is formed from the upper electrode film 20 in the drawing to the lower electrode film in the drawing so as to cross between the electrode films 20 adjacent in the vertical direction in the drawing. For example, it can be provided in a rectangular shape in plan view over a region up to 20.

  In the structure obtained as described above, as shown in FIG. 2C, the bridge wiring for electrically connecting the electrode films 20 adjacent in the vertical direction in the drawing via the insulating film 3 4 is formed.

  In the present invention, since the insulating film 3 can be patterned with high accuracy, the wiring connection (conductivity) by the bridge wiring 4 can be stabilized.

  The method for forming the bridge wiring 4 is not particularly limited, but it is preferable that the bridge wiring 4 is formed by applying a coating liquid containing a conductive material which is a functional material by an ink jet method and drying it.

  As shown in FIG. 3, a plurality of second transparent electrodes 22 are formed by electrically connecting a plurality of electrode films 20 that are precursors of a plurality of second transparent electrodes by bridge wires 4 respectively. A mold electrode substrate is obtained.

  In the obtained matrix type electrode substrate, the plurality of first transparent electrodes 21 and the plurality of second transparent electrodes 22 extend in directions intersecting each other. Since the insulating film 3 is provided at the intersecting portion 23, the plurality of first transparent electrodes 21 and the plurality of second transparent electrodes 22 intersect with each other while being insulated from each other.

  As described above, the case where the present invention is used for forming an insulating pattern of a touch panel has been described. However, the present invention is not limited to this, and can be used for forming an insulating pattern in various electronic components in general in the electronics field.

  It is preferable to use the method for forming an insulating pattern according to the present invention, for example, for forming an insulating layer of a semiconductor element or an insulating layer of a light emitting element because the effect of the present invention becomes particularly significant. Usually, these insulating layers are often formed over different members, or formed over uneven members, and a functional material may be further patterned on the insulating layer. Many. Therefore, a significant effect is likely to be achieved from the viewpoint of ensuring insulation and optimizing the function expression by the functional material.

  In the description of the insulating pattern formation of the touch panel described above, an example in which a conductive material is patterned as a functional material on the insulating layer is shown. However, if a semiconductor element is used, a semiconductor material is used as a functional material, and if a light emitting element is used, a function is provided. A light-emitting material can be suitably patterned by an inkjet method or the like as a material. According to the present invention, it can be seen that the function of the functional material patterned on the insulating layer (conductivity by a conductive material, semiconductor characteristics by a semiconductor material, light emission characteristics by a light emitting material, etc.) can be suitably expressed.

  Examples of the present invention will be described below, but the present invention is not limited to these examples.

(Tests 1, 2 and 3)
<Production of substrate>
An ITO film was formed on one surface of a glass substrate (transparent substrate) 1 by sputtering, a positive resist was applied on the ITO layer, pre-baked, and mask exposure and development using an ultrahigh pressure mercury lamp light source were performed. Thereafter, the ITO layer is etched with an etching solution, and the resist is peeled off with a caustic potash aqueous solution, and a plurality of first transparent electrodes 21 and a plurality of electrode films (second transparent films) as shown in FIG. 1 and FIG. Electrode precursor) 20 was formed.

<Preparation of insulating layer forming ink>
According to the composition and amount shown in Table 1, each material was mixed, and then filtered using a 3 μm membrane filter made of “Teflon” (registered trademark) manufactured by ADVATEC, and insulating layer forming inks 1, 2, 3 was produced. It was confirmed that the composition did not change substantially due to filtration.

<Viscosity measurement>
The ink of the present invention is set in a temperature-controllable stress-control rheometer (Physica MCR300, manufactured by Anton Paar), heated to 100 ° C., cooled to 25 ° C. at a cooling rate of 0.1 ° C./s, and measured for viscosity. Went. The measurement was performed using a cone plate (CP75-1, manufactured by Anton Paar) having a diameter of 75.033 mm and a cone angle of 1.017 °.

  The temperature was controlled by a Peltier element type temperature controller (TEK150P / MC1) attached to the Physica MCR300.

  From the obtained results, the temperature at which the viscosity becomes around 10 mPa · s suitable for inkjet emission was defined as the temperature during emission. The viscosity after landing is a value at the temperature of the substrate (25 ° C.).

<Inkjet application>
Each ink composition prepared above is loaded into an ink jet recording apparatus having an ink jet recording head equipped with a piezo type ink jet nozzle. Inks 1 and 2 are all set at 100 ° C. for the head, ink supply system, and the like. The head temperature was set to 50 ° C., and each ink was applied to the area 3 of FIG. 2B by adjusting the amount of ink and the resolution so that the wet film thickness was 3 μm. The substrate was adjusted to 25 ° C. and placed on the stage.

After ejecting the ink onto the base material by inkjet, an LED lamp (8 W / cm ² , water cooled unit) manufactured by Phoseon Technology was irradiated from a distance of 5 mm from the tube surface to cure the ink and form an insulating layer. .

  Next, the coating liquid containing PEDOT / PSS (Orgacon IJ-1005 manufactured by Agfa Materials Co., Ltd.) as the conductive material is used as shown in FIG. It was applied so as to form a bridge wiring 4 as shown in FIG.

<Evaluation method: Patternability>
The formed insulating layer was observed with a microscope, and the patterning property was evaluated according to the following evaluation criteria.
[Evaluation criteria]
◯: The formation region of the insulating layer coincides with the desired formation region (region 3 in FIG. 2B).
X: The formation region of the insulating layer does not coincide with the desired formation region (region 3 in FIG. 2B).

<Evaluation method: Bridge wiring suitability>
The formed bridge wiring was observed with a microscope to see if it was disconnected. Further, it was confirmed with a tester whether electricity flows over the long side of the bridge wiring (vertical direction in FIG. 2C). Bridge wiring suitability was evaluated according to the following criteria.
[Evaluation criteria]
○: There is no disconnection and electricity flows.
X: Disconnected and no electricity flows.

  The evaluation results are shown in Table 1.

<Evaluation>
In Tests 1 and 2 using the inks 1 and 2 that satisfy the viscosity change condition according to the present invention (both of the present invention), the insulating layer could be neatly patterned in the region of reference numeral 3 in FIG. In Test 3 (Comparative Example) using the ink 3 that does not satisfy the viscosity change condition according to the above, because ink wettability is different between glass and ITO, ink flows on the glass surface, and patterning as intended cannot be performed. It was.

  In Tests 1 and 2, since the insulating layer was uniform, it was confirmed that the bridge wiring was formed without disconnection between the electrode and the insulating layer, and electricity flowed. On the other hand, in Test 3, since the insulating layer flowed to the glass surface and did not form a uniform film, the bridge wiring applied thereon was broken and electricity did not flow. From this, according to this invention, it turns out that the function of the functional material patterned on the said insulating layer can be expressed suitably.

  Furthermore, in Test 2 using a curable oil gelling agent, the adhesion of the bridge wiring was stronger than in Test 1.

  In the above embodiment, the case where the viscosity change condition according to the present invention is satisfied by the expression of the phase change mechanism due to gelation is shown as an example. As long as the conditions can be achieved, the effects of the present invention can be achieved regardless of the mechanism.

1: Transparent substrate 2: Electrode pattern 20: Electrode film (second transparent electrode precursor)
21: 1st transparent electrode 211: Island-like electrode part 212: Connection electrode part 22: 2nd transparent electrode 23: Crossing part 3: Insulating layer 4: Bridge wiring

Claims (11)

A method for forming an insulating pattern in which an insulating layer forming ink is applied to a substrate so as to satisfy the following conditions when patterning an insulating layer by an inkjet method.
(Viscosity after landing on the base material) / (Viscosity upon emission) ≧ 100   The insulating pattern forming method according to claim 1, wherein the insulating layer forming ink has a phase change mechanism of any one of hot melt, thixotropy, and gelation.   The method for forming an insulating pattern according to claim 1, wherein the insulating layer forming ink has a curing mechanism by polymerization or cross-linking between molecules.   The method for forming an insulating pattern according to claim 3, wherein the insulating layer forming ink contains an active energy ray-curable composition and an oil gelling agent.   The method for forming an insulating pattern according to claim 4, comprising at least one curable oil gelling agent as the oil gelling agent.   The method for forming an insulating pattern according to claim 4 or 5, comprising an acrylic monomer as the active energy ray-curable composition.   The said insulating layer is a formation method of the insulating pattern in any one of Claims 1-6 formed ranging over a different member.   The said insulating layer is a formation method of the insulating pattern in any one of Claims 1-7 formed ranging over an uneven | corrugated member.   The said insulating layer is a formation method of the insulating pattern in any one of Claims 1-8 which comprises the foundation | substrate of the bridge wiring of a touch panel.   The method for forming an insulating pattern according to claim 1, wherein a functional material is further patterned on the insulating layer.   The method for forming an insulating pattern according to claim 10, wherein the functional material is a conductive material.

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