WO2014073591A1 - フレキシブルデバイス用基板、フレキシブルデバイス及びその製造方法、積層体及びその製造方法、並びに、樹脂組成物 - Google Patents
フレキシブルデバイス用基板、フレキシブルデバイス及びその製造方法、積層体及びその製造方法、並びに、樹脂組成物 Download PDFInfo
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D86/00—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates
- H10D86/01—Manufacture or treatment
- H10D86/021—Manufacture or treatment of multiple TFTs
- H10D86/0214—Manufacture or treatment of multiple TFTs using temporary substrates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
- B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1039—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors comprising halogen-containing substituents
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1046—Polyimides containing oxygen in the form of ether bonds in the main chain
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1046—Polyimides containing oxygen in the form of ether bonds in the main chain
- C08G73/1053—Polyimides containing oxygen in the form of ether bonds in the main chain with oxygen only in the tetracarboxylic moiety
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1067—Wholly aromatic polyimides, i.e. having both tetracarboxylic and diamino moieties aromatically bound
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1067—Wholly aromatic polyimides, i.e. having both tetracarboxylic and diamino moieties aromatically bound
- C08G73/1071—Wholly aromatic polyimides containing oxygen in the form of ether bonds in the main chain
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/54—Silicon-containing compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D179/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen, with or without oxygen, or carbon only, not provided for in groups C09D161/00 - C09D177/00
- C09D179/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C09D179/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D30/00—Field-effect transistors [FET]
- H10D30/60—Insulated-gate field-effect transistors [IGFET]
- H10D30/67—Thin-film transistors [TFT]
- H10D30/6758—Thin-film transistors [TFT] characterised by the insulating substrates
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D86/00—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates
- H10D86/40—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates characterised by multiple TFTs
- H10D86/411—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates characterised by multiple TFTs characterised by materials, geometry or structure of the substrates
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D86/00—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates
- H10D86/40—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates characterised by multiple TFTs
- H10D86/60—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates characterised by multiple TFTs wherein the TFTs are in active matrices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2379/00—Other polymers having nitrogen, with or without oxygen or carbon only, in the main chain
- B32B2379/08—Polyimides
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/582—Recycling of unreacted starting or intermediate materials
Definitions
- the present invention particularly relates to a flexible device and a resin composition useful for the production thereof, a laminate and a method for producing the laminate, and a method for producing a flexible device using the laminate.
- the present invention also relates to a flexible device substrate suitably used for a flexible device and a flexible device using the same.
- the resin substrate under consideration is a heat treatment step of 400 ° C. or higher required in a device manufacturing process using a silicon-based semiconductor, and a temperature of 300 ° C. or higher required in a device manufacturing step using a metal oxide semiconductor. Resistant to the heat treatment process is required, and in order to suppress the dimensional difference during the heat treatment process caused by the difference in thermal expansion coefficient between the resin substrate and the silicon-based semiconductor or metal oxide semiconductor, the resin substrate and the inorganic substrate The process which peels a resin substrate from an inorganic substrate after device manufacture is required.
- a polyimide having a thermal expansion coefficient close to that of a silicon-based semiconductor and having a heat resistance of 400 ° C. or higher is low in thermal expansion by molecular orientation, and thus has no adhesion to an inorganic substrate. For this reason, forming an inorganic layer for resin adhesion, such as a silicon nitride layer and an amorphous silicon layer, on the surface of an inorganic substrate has been performed.
- an inorganic layer for resin adhesion such as a silicon nitride layer and an amorphous silicon layer
- Patent Literature in the field of an interlayer insulating film (passivation film) and a surface protection film (overcoat film) of a semiconductor element, a resin composition containing polyimide, a silane coupling agent, and a solvent is known (Patent Literature). 3).
- a photosensitive resin composition containing an alkali-soluble resin, a photoacid generator, a fatty acid alcohol compound, and an organosilicon compound is known as a surface protective film or an interlayer insulating film in a semiconductor device (see Patent Document 5). .
- a positive photosensitive resin composition that is a polybenzoxazole-based heat-resistant polymer that can be applied as a surface protective film, an interlayer insulating film, or the like of an electronic component such as a semiconductor element is known (see Patent Document 6).
- a flexible light-receiving element that includes a flexible transparent plastic substrate, an electrode layer, and a semiconductor layer, and the substrate is formed of a polyimide film containing polyimide as a main component (patent) Reference 7).
- Patent Document 5 Patent Document 6, and Patent Document 7, there is no mention of peelability other than adhesion to an inorganic substrate.
- Patent Document 5 forms a surface protective film or an interlayer insulating layer of a semiconductor device from a resin composition. In the examples, only sensitivity and adhesiveness experiments are conducted. In Patent Document 5, an inorganic substrate is used. On the other hand, a resin composition having a composition for achieving both adhesion and peelability is not envisaged.
- Patent Document 6 a silane coupling agent is added to improve the adhesion of the positive photosensitive resin composition to the substrate, but peeling from the substrate is not assumed. Similarly, Patent Document 6 does not assume a resin composition having a composition for achieving both adhesiveness and peelability for an inorganic substrate.
- Patent Document 7 describes a substrate made of a polyimide film. However, it does not assume that the substrate made of a polyimide film is peeled off from the inorganic substrate, and has both adhesion and peelability to the inorganic substrate.
- the polyimide film which consists of a composition for making it do is not assumed.
- any of the patent documents there is no disclosure of a composition that can reduce film thickness variation in a flexible device substrate mainly composed of polyimide. As shown in a comparative example to be described later, conventionally, a variation in the film thickness of a flexible device substrate mainly composed of polyimide has been likely to be large. Also, none of the patent documents discloses a flexible device substrate mainly composed of polyimide or a flexible device including a polyimide resin layer that exhibits good in-plane uniformity in property evaluation such as electrical properties. .
- An object of the present invention is to provide a resin composition, a laminate, a method for producing the laminate, and a method for producing a flexible device. It is another object of the present invention to provide a flexible device substrate that is less likely to cause device malfunction when the device is configured, and a flexible device using the substrate.
- the substrate for a flexible device of the present invention is represented by ( ⁇ ) a polyimide having a 5% thermal decomposition temperature of 350 ° C. or higher, ( ⁇ ) a chemical structure represented by the following general formula (1) and / or the following general formula (2). ( ⁇ ) a compound having a chemical structure, ( ⁇ ) a chemical structure represented by the following general formula (3), a compound having one or more of the group consisting of a hydroxyl group, a carboxyl group and a sulfo group, ( ⁇ ) the following general formula ( 4) A compound having a chemical structure represented by 4) is contained.
- the flexible device of the present invention is characterized in that a semiconductor device is formed on the flexible device substrate described above.
- the flexible device of the present invention is characterized in that the semiconductor device is a thin film transistor.
- the flexible device of the present invention is a polysilicon semiconductor or metal oxide semiconductor driven flexible display.
- the flexible device of the present invention is represented by ( ⁇ ) polyimide having a 5% thermal decomposition temperature of 350 ° C. or higher, ( ⁇ ) a chemical structure represented by the following general formula (1) and / or the following general formula (2).
- a compound having a chemical structure ( ⁇ ) a chemical structure represented by the following general formula (3), a compound having one or more members selected from the group consisting of a hydroxyl group, a carboxyl group and a sulfo group, ( ⁇ ) the following general formula (4) It contains the polyimide resin layer containing the compound which has a chemical structure represented by these.
- the laminate of the present invention comprises an inorganic substrate, and a polyimide resin layer provided on the surface of the inorganic substrate, and (a) a polyimide resin layer containing polyimide having a 5% thermal decomposition temperature of 350 ° C. or higher, and the polyimide resin layer And the inorganic substrate have a 180 ° peel strength of 0.004 to 0.250 N / cm.
- the polyimide resin layer has (b) a silicone surfactant or a fluorosurfactant, and (c) an amide group, an amino group, a carbamate group, a carboxyl group, an aryl group, and an acid anhydride. And an alkoxysilane compound having at least one functional group selected from the group consisting of a group and a polymerizable cyclic ether group.
- the laminate of the present invention is characterized in that the inorganic substrate is a glass substrate.
- the method for producing a flexible device of the present invention includes a step of forming a semiconductor device on the above-described laminate, and a step of peeling from the inorganic substrate thereafter.
- the method for producing a flexible device of the present invention further includes a step of heating the laminate to 250 ° C. or higher.
- the method for manufacturing a flexible device of the present invention is characterized in that the semiconductor device is a thin film transistor.
- the method for producing a flexible device of the present invention is characterized in that the flexible device is a polysilicon semiconductor or metal oxide semiconductor drive flexible display.
- the resin composition of the present invention includes (a) a polyimide having a 5% thermal decomposition temperature of 350 ° C. or higher, or a polyimide precursor that becomes a polyimide having a 5% thermal decomposition temperature of 350 ° C. or higher by imidization, and (b) At least one selected from the group consisting of a silicone-based surfactant or a fluorine-based surfactant and (c) an amino group, a carbamate group, a carboxyl group, an aryl group, an acid anhydride group, an amide group, and a polymerizable cyclic ether group And an alkoxysilane compound having a functional group of:
- the component (b) has 2 to 1000 Si—O bonds in the molecule as a nonpolar site, and 1 to 100 polyether groups in the molecule as a polar site, It is a silicone-based surfactant having a hydroxyl group, a carboxyl group or a sulfo group.
- the component (b) has 3 to 100 C—F group bonds in the molecule as nonpolar sites, and 1 to 100 polyether groups in the molecule as polar sites.
- the resin composition of the present invention is characterized in that the component (b) is contained in an amount of 0.001 to 10 parts by mass with respect to 100 parts by mass of the component (a).
- the component (c) is an alkoxysilane compound having at least one functional group selected from the group consisting of a carbamate group, a carboxyl group, an amide group, and an aryl group. .
- the resin composition of the present invention is characterized in that the component (c) is contained in an amount of 0.001 to 9 parts by mass with respect to 100 parts by mass of the component (a).
- the resin composition of the present invention is characterized by further containing (d) a solvent.
- the component (d) is an aprotic polar solvent.
- the manufacturing method of the laminated body of this invention forms the polyimide resin layer which consists of the process of expand
- the method for manufacturing a laminate according to the present invention is characterized in that the inorganic substrate is a glass substrate.
- the method for producing a flexible device of the present invention includes a step of forming a semiconductor device on the laminate obtained by the method for producing a laminate as described above, and then a step of peeling from the inorganic substrate. To do.
- the method for producing a flexible device of the present invention further includes a step of heating the laminate to 250 ° C. or higher.
- the method for manufacturing a flexible device of the present invention is characterized in that the semiconductor device is a thin film transistor.
- the method for producing a flexible device of the present invention is characterized in that the flexible device is a polysilicon semiconductor or metal oxide semiconductor drive flexible display.
- a resin composition, a laminate, and a laminate that have sufficient adhesion between a resin layer and an inorganic substrate in the process of manufacturing a flexible device, and that can easily peel only the inorganic substrate from the resin layer in the final stage.
- the manufacturing method of a body and the manufacturing method of a flexible device can be provided.
- the present inventors have controlled the 180 ° peel strength between the polyimide resin layer and the inorganic substrate, thereby allowing the adhesion and peeling between the polyimide resin layer and the inorganic substrate.
- the polyimide resin layer formed using a resin composition containing a specific surfactant and a polyimide containing a specific alkoxysilane compound or a polyimide precursor is superior to an inorganic substrate. It has been found that it exhibits adhesion and easy peelability, and the present invention has been made based on this finding.
- the polyimide resin layer in the present invention is a thin film having flexibility, for example, and is used for flexible devices such as flexible memories, sensors, and RF-IDs. Typically used for flexible displays.
- the polyimide resin layer is first formed on a rigid substrate, It is necessary to form each functional layer that constitutes the device on the polyimide resin layer in order with the polyimide resin layer in close contact with the rigid substrate, and then peel off the completed flexible device from the rigid substrate.
- the advantage of the polyimide resin layer is that it has good heat resistance against the curing process (including the drying process) applied to the device formation process. For this reason, even if a curing process is performed on the polyimide resin layer in the device formation process, no defects occur in the polyimide resin layer.
- the polyimide resin layer has appropriate adhesion and peelability to an inorganic substrate which is a rigid substrate as described above.
- FIG. 8 is a conceptual diagram showing a change in adhesion when an additive for increasing adhesion is added to polyimide.
- FIG. 8 shows the adhesion to the inorganic substrate when the additive for improving the adhesion is added to the polyimide in the state where the additive for increasing the peelability is not added.
- (2) shown in FIG. 8 shows the adhesion to the inorganic substrate when the additive for increasing the adhesiveness is added to the polyimide in the state where the additive for increasing the peelability is added.
- the adhesion gradually increases as an additive for increasing the adhesion is added.
- the 180 ° peel strength between the polyimide resin layer and the inorganic substrate can be appropriately controlled, and good adhesion and peelability can be obtained.
- the present invention has been made based on the concept (2) shown in FIG.
- the laminate according to the present embodiment includes an inorganic substrate, and (a) a polyimide resin layer containing polyimide having a 5% thermal decomposition temperature of 350 ° C. or higher provided on the surface of the inorganic substrate,
- the 180 ° peel strength between the polyimide resin layer and the inorganic substrate is 0.004 to 0.250 N / cm.
- 180 ° peel strength is a test method for evaluating the peel strength of a laminated film or adhesive tape bonded by an adhesive layer, as defined in Japanese Industrial Standards (JIS Handbook Adhesion, K-6854). Yes, here, the adhesion to the polyimide resin layer formed on the surface of the inorganic substrate is shown.
- the heat resistance adhesion between the polyimide resin layer (polyimide film) and the inorganic substrate is sufficient because the 180 ° peel strength between the polyimide resin layer and the inorganic substrate is 0.004 N / cm or more. It will be a thing.
- the 180 ° peel strength is more preferably 0.010 N / cm or more, and further preferably 0.015 N / cm or more.
- the peelability of the polyimide resin layer from the inorganic substrate can be controlled.
- the 180 ° peel strength is more preferably 0.075 N / cm or less, and further preferably 0.050 N / cm or less.
- the 180 ° peel strength is controlled by, for example, (b) a silicone-based surfactant or a fluorine-based surfactant, and (c) an amino group, a carbamate group, a carboxyl group, an aryl group, an acid anhydride group, as described later.
- a silicone-based surfactant or a fluorine-based surfactant and (c) an amino group, a carbamate group, a carboxyl group, an aryl group, an acid anhydride group, as described later.
- an alkoxysilane compound having at least one functional group selected from the group consisting of an amide group and a polymerizable cyclic ether group it can be carried out by adjusting these types and amounts.
- the polyimide resin layer preferably has a thickness of 5 ⁇ m to 200 ⁇ m.
- the thickness is preferably 10 ⁇ m to 30 ⁇ m. If it is 5 ⁇ m or more, the resin layer has excellent mechanical strength, and if it is 200 ⁇ m or less, the resin layer has excellent flexibility and lightness.
- the thickness of the inorganic substrate is preferably 0.2 mm to 5 mm.
- the resin composition of the present embodiment includes (a) a polyimide precursor having a 5% thermal decomposition temperature of 350 ° C. or higher or a polyimide precursor having a 5% thermal decomposition temperature of 350 ° C. or higher, and (b) a silicone-based surface activity. And (c) at least one functional group selected from the group consisting of an amino group, a carbamate group, a carboxyl group, an aryl group, an acid anhydride group, an amide group, and a polymerizable cyclic ether group. And having an alkoxysilane compound.
- a polyimide resin layer made of polyimide having a 5% thermal decomposition temperature of 350 ° C. or higher, or formed by polyimidizing a polyimide precursor has a 5% thermal decomposition temperature of 350 ° C. or higher. Therefore, it is possible to form a polyimide resin layer that can withstand a heat treatment step, for example, exceeding 300 ° C., which is necessary for manufacturing a flexible display.
- the thermal decomposition temperature refers to the thermal decomposition temperature obtained by TG / DTA measurement.
- the 5% thermal decomposition temperature is a TG / DTA measurement.
- the weight change due to thermal decomposition is 5%. It means the temperature when the temperature is reached.
- the addition of a silicone surfactant or a fluorine surfactant improves the film thickness uniformity when a varnish-like composition is coated on an inorganic substrate.
- the good uniformity of film thickness has the advantage that a polyimide resin layer can be stably formed on an inorganic substrate and appearance abnormality is unlikely to occur during heat treatment.
- An alkoxysilane compound having at least one functional group selected from the group consisting of an amino group, a carbamate group, a carboxyl group, an aryl group, an acid anhydride group, an amide group and a polymerizable cyclic ether group is a functional group of the compound. Due to the direct bond between the group and the polymer and the intermolecular interaction, it is difficult to volatilize when the resin composition is heated. In addition, since the alkoxysilane compound is effectively taken into the polyimide resin layer by heat treatment during imidization / orientation, the polyimide resin layer is held at a desired thickness with respect to the inorganic substrate. And exhibit heat-resistant adhesion (initial adhesion and long-term adhesion) exceeding 300 ° C. in an inert atmosphere.
- alkoxysilane compounds that do not have these functional groups volatilize except for compounds that adhere to and bind to the surface of the inorganic substrate during the heating process before imidization, and are not effectively retained in the composition.
- the polyimide resin layer in close contact with the substrate becomes thin and has poor heat resistant adhesion.
- the heat-resistant adhesion includes initial adhesion when handling the laminate and long-term adhesion during heat treatment during device formation.
- the initial adhesion means that a polyimide precursor resin composition that becomes a polyimide having a 5% thermal decomposition temperature of 350 ° C. or higher is coated on an inorganic substrate by imidization, and then polyimide is formed by heat treatment to form a polyimide resin layer.
- a polyimide precursor resin composition that becomes a polyimide having a 5% thermal decomposition temperature of 350 ° C. or higher is coated on an inorganic substrate by imidization, and then polyimide is formed by heat treatment to form a polyimide resin layer.
- adhesion between the polyimide resin layer immediately after removing the solvent and the inorganic substrate under high-temperature conditions refers to adhesion at 300 ° C. or higher.
- long-term adhesion means that a heat treatment is performed on a laminate composed of an inorganic substrate and a polyimide resin layer for a long time under a higher temperature condition, specifically, for example, at 300 ° C. to 500 ° C. for 6 minutes to 5 hours. Refers to adhesion after application. In the production of flexible devices, good initial adhesion and long-term adhesion have the advantage of suppressing appearance abnormalities such as peeling and swelling during heat treatment.
- the polyimide resin layer easily peels from the inorganic substrate.
- the polyimide resin layer does not peel off from the inorganic substrate by heat treatment during device formation, and the device can be formed well, and the polyimide resin layer can be easily peeled off from the inorganic substrate after forming the device, resulting in a good flexible device. It is done.
- easy peelability means that a polyimide resin layer can be easily peeled from an inorganic substrate.
- the excellent easy peelability has an advantage that the inorganic substrate can be easily peeled from the polyimide resin layer in the manufacture of the flexible device.
- the polyimide resin layer can be peeled cleanly from the inorganic substrate, and a polyimide resin layer having a flat surface without any defects on the peeled surface can be obtained.
- each component of the resin composition according to the present embodiment will be described in detail.
- polyimide or polyimide precursor The polyimide or polyimide precursor according to the present embodiment is obtained by reacting tetracarboxylic dianhydride and diamine.
- a polyimide precursor means what becomes a polyimide by imidation, and does not mean only a polyamic acid, The thing which a part of polyamic acid imidated and polyamic acid ester are also included.
- polyamic acid is preferable from the viewpoints of solubility in a solvent to be used and heat resistance after polyimide formation.
- polyimide or polyimide precursor is pyromellitic dianhydride, 3,3 ′, 4,4′-biphenyltetracarboxylic dianhydride, 2,3,3 ′, 4 ′.
- -Biphenyltetracarboxylic dianhydride 2,2 ', 3,3'-biphenyltetracarboxylic dianhydride, p-phenylenebis (trimellitic acid monoester anhydride), 1,2,5,6-
- the group consisting of naphthalenetetracarboxylic dianhydride, 2,3,6,7-naphthalenetetracarboxylic dianhydride, 3,3′-oxydiphthalic dianhydride, and 4,4′-oxydiphthalic dianhydride At least one selected from the group consisting of 80 mol% or more of all tetracarboxylic dianhydrides, and p-phenylenediamine, m-phenylenediamine, benzidine, 4,4 ′-(or , 4'-, 3,3'-, 2,4 '-) diamino-diphenyl ether, 5-amino-2- (p-amino-phenyl) benzox
- the polyimide or polyimide precursor consists of a fluorine-containing aromatic acid dianhydride, an alicyclic acid dianhydride, and a sulfur-containing acid dianhydride as a tetracarboxylic dianhydride. It is a polyimide or polyamic acid obtained by reacting at least one selected from the group consisting of fluorine group-containing aromatic diamine, alicyclic diamine, and sulfur-containing diamine as at least one selected from the group, or diamine. It is preferable.
- Fluorine group-containing aromatic acid dianhydrides include 2,2-bis (3,4-dicarboxyphenyl) hexafluoropropane dianhydride, 2,2-bis (4- (3,4-dicarboxyphenoxy) Phenyl) hexafluoropropane dianhydride, 2,2-bis (4- (3,4-dicarboxybenzoyloxy) phenyl) hexafluoropropane dianhydride, and 2,2′-bis (trifluoromethyl)- 4,4′-bis (3,4-dicarboxyphenoxy) biphenyl dianhydride and the like.
- alicyclic acid dianhydrides examples include bicyclo [2,2,2] oct-7-ene-2,3,5,6-tetracarboxylic dianhydride, 2,3,5,6-cyclohexanetetracarboxylic Acid dianhydride, 3,3 ′, 4,4′-bicyclohexyltetracarboxylic dianhydride, 1,2,3,4-cyclopentanetetracarboxylic dianhydride, cyclobutanetetracarboxylic dianhydride, etc. Can be mentioned.
- sulfur-containing dianhydride examples include bis (3,4-dicarboxyphenyl) sulfone dianhydride.
- Fluorine group-containing aromatic diamines include 1,1,1,3,3,3-hexafluoro-2,2-bis (4-amino-phenyl) propane and 2,2′-bis (trifluoromethyl) benzidine 2,2-bis (3-amino-4-hydroxyphenyl) hexafluoropropane, 2,2′-bis (3-amino-2,4-dihydroxyphenyl) hexafluoropropane, 2,2′-bis (4 -Amino-3,5-dihydroxyphenyl) hexafluoropropane, 2,2-bis [4- (3-amino-phenoxy) phenyl] -1,1,1,3,3,3-hexafluoropropane, 2, Examples thereof include 2-bis [4- (4-amino-phenoxy) phenyl] -1,1,1,3,3,3-hexafluoropropane.
- Examples of the alicyclic diamine include 1,4-diaminocyclohexane, 1,3-diaminocyclohexane, 4,4′-diaminodicyclohexylmethane, 4,4′-diaminodicyclohexylpropane, and 2,3-diaminobicyclo [2.2.
- sulfur-containing diamine examples include 4,4 ′-(or 3,4′-, 3,3′-, 2,4 ′-) diamino-diphenylsulfone, 4,4 ′-(or 3,4′-, 3 , 3′-, 2,4 ′-) diamino-diphenyl sulfide, 4,4′-di (4-amino-phenoxy) phenyl sulfone, 4,4′-di (3-amino-phenoxy) phenyl sulfone, 3, 3'-diamino-diphenylsulfone, 3,3'-dimethyl-4,4'-diamino-biphenyl-6,6'-disulfone, bis (3-amino-phenyl) sulfide, bis (4-amino-phenyl) sulfide Bis (3-amino-phenyl) sulfoxide, bis (4-amino-phenyl) sulfoxide,
- tetracarboxylic dianhydrides include 3,3 ′, 4,4′-benzophenone tetracarboxylic dianhydride, 2,3,3 ′, 4′-benzophenone tetracarboxylic dianhydride, 2 , 2 ′, 3,3′-benzophenone tetracarboxylic dianhydride and the like. These tetracarboxylic dianhydrides may be used alone or in admixture of two or more.
- tetracarboxylic dianhydride other conventionally known tetracarboxylic dianhydrides can be used as long as the effects of the present embodiment are exhibited.
- Examples of other tetracarboxylic dianhydrides include 2,2-bis (3,4-dicarboxyphenyl) propane dianhydride and 2,2-bis (2,3-dicarboxyphenyl) propane dianhydride. 1,1-bis (3,4-dicarboxyphenyl) ethane dianhydride, 1,1-bis (2,3-dicarboxyphenyl) ethane dianhydride, bis (3,4-dicarboxyphenyl) methane Dianhydride, bis (2,3-dicarboxyphenyl) methane dianhydride, 2,2-bis (4- (4-amino-phenoxy) phenyl) propane, 1,3-dihydro-1,3-dioxo- 5-Isobenzofurancarboxylic acid-1,4-phenylene ester, 4- (2,5-dioxotetrahydrofuran-3-yl) -1,2,3,4-tetrahydronaphthalene-1,2-dicar
- Examples of other diamines that can be used include the following. 3,3′-dimethyl-4,4′-diamino-biphenyl, 2,2′-dimethyl-4,4′-diamino-biphenyl, 3,3′-diethyl-4,4′-diamino-biphenyl, 2, 2'-diethyl-4,4'-diamino-biphenyl, 1,4-cyclohexyldiamine, p-xylylenediamine, m-xylylenediamine, 1,5-diamino-naphthalene, 3,3'-dimethoxybenzidine, 4 , 4 '-(or 3,4'-, 3,3'-, 2,4'-) diamino-diphenylmethane, 4,4 '-(or 3,4'-, 3,3'-, 2,4 '-) Diamino-diphenyl ether, 4,4'-benzophenonediamine,
- a method for producing a polyimide precursor will be described.
- all methods capable of producing a polyimide precursor including known methods, can be applied. Among these, it is preferable to perform the reaction in an organic solvent.
- solvent used in such a reaction examples include N, N-dimethylformamide, N, N-dimethylacetamide, N-methyl-2-pyrrolidone, ⁇ -butyrolactone, 1,2-dimethoxyethane, tetrahydrofuran, 1,3 -Dioxane, 1,4-dioxane, dimethyl sulfoxide, benzene, toluene, xylene, mesitylene, phenol, cresol, ethyl benzoate and butyl benzoate. These may be used alone or in combination of two or more.
- N, N-dimethylformamide, N, N-dimethylacetamide, N-methyl-2-pyrrolidone and ⁇ -butyrolactone are preferable, and N-methyl-2-pyrrolidone is particularly preferable.
- the concentration of the reaction raw material in this reaction is usually 2% by mass to 80% by mass, preferably 5% by mass to 30% by mass.
- the molar ratio of tetracarboxylic dianhydride to be reacted and diamine is in the range of 0.8 to 1.2. Within this range, the molecular weight can be increased, and the elongation and the like are excellent.
- the molar ratio is preferably 0.9 to 1.1, more preferably 0.92 to 1.07.
- the weight average molecular weight of the polyimide precursor is preferably 1,000 or more and 1,000,000 or less.
- the weight average molecular weight refers to a molecular weight measured by gel permeation chromatography using polystyrene having a known number average molecular weight as a standard.
- the weight average molecular weight is more preferably from 10,000 to 500,000, and most preferably from 20,000 to 300,000.
- the weight average molecular weight is 1,000 or more and 1,000,000 or less, the strength and elongation of the resin layer obtained using the resin composition is improved, and the mechanical properties are excellent. Furthermore, it can be applied without bleeding at a desired film thickness during processing such as coating.
- the polyimide precursor is obtained by the following method. First, polyamic acid is produced by subjecting the reaction raw material to a polycondensation reaction from room temperature to 80 ° C.
- the end of the polymer main chain of the polyimide precursor can be end-capped with an end-capping agent made of a monoamine derivative or a carboxylic acid derivative.
- an end-capping agent made of a monoamine derivative or a carboxylic acid derivative.
- terminal blocking agent comprising a monoamine derivative
- examples of the terminal blocking agent comprising a monoamine derivative include aniline, o-toluidine, m-toluidine, p-toluidine, 2,3-xylidine, 2,6-xylidine, 3,4-xylidine, and 3,5-xylidine.
- Examples of the end-capping agent comprising a carboxylic acid derivative mainly include carboxylic anhydride derivatives.
- carboxylic anhydride derivative examples include phthalic anhydride, 2,3-benzophenone dicarboxylic anhydride, 3,4-benzophenone dicarboxylic anhydride, 2,3-dicarboxyphenyl phenyl ether anhydride, 3,4-di Carboxyphenyl phenyl ether anhydride, 2,3-biphenyl dicarboxylic acid anhydride, 3,4-biphenyl dicarboxylic acid anhydride, 2,3-dicarboxyphenyl phenyl sulfone anhydride, 3,4-dicarboxyphenyl phenyl sulfone anhydride 2,3-dicarboxyphenyl phenyl sulfide anhydride, 3,4-dicarboxyphenyl phenyl sulfide anhydride, 1,2-naphthalenedicarboxylic anhydride, 2,3-naphthalenedicarboxylic anhydride, 1,8-naphthal
- the obtained polyimide precursor solution may be used as it is without removing the solvent, and may further be used as a resin composition according to the present embodiment by blending necessary solvents, additives and the like.
- Silicone-based surfactant or fluorine-based surfactant is not particularly limited as long as it has a siloxane structure as a nonpolar site.
- the number of Si—O bonds in one molecule which is a nonpolar site is preferably 2 or more. From the viewpoint of uniform film formation with polyimide or a polyimide precursor, the number of Si—O bonds in one molecule which is a nonpolar site is preferably 1000 or less, more preferably 500 or less, and even more preferably 100 or less. is there.
- the number of polyether groups, hydroxyl groups, carboxyl groups, or sulfo groups in one molecule, which is a polar site is preferably 1 or more.
- the number of polyether groups, hydroxyl groups, carboxyl groups, or sulfo groups in one molecule that are polar sites is preferably 100 or less, more preferably 70 or less, and even more preferably 50 or less.
- the maximum value of the molecular weight of the silicone-based surfactant to be added is that the silicone-based surfactant gathers at the interface between the polyimide resin layer and the inorganic substrate due to the solvent drying of the varnish and the heating in the curing process.
- the size is adjusted so as to obtain good peelability from the inorganic substrate. Therefore, the molecular weight of the silicone surfactant is preferably 20000 or less, and more preferably 5000 or less.
- the minimum molecular weight of the silicone surfactant to be added is that the silicone surfactant does not volatilize and remains in the polyimide resin layer by heating in the solvent drying and curing process of the varnish, and the polyimide resin layer is inorganic.
- the size is adjusted so as to obtain good peelability from the substrate. Therefore, the molecular weight of the silicone surfactant is preferably 50 or more, and more preferably 100 or more.
- the fluorosurfactant according to the present embodiment is not particularly limited as long as it has a C—F group bonding structure as a nonpolar site, but it is 3 or more and 100 or less in the molecule as a nonpolar site.
- the number of C—F bonds in one molecule which is a nonpolar site is preferably 3 or more. From the viewpoint of uniform film formation with polyimide or polyimide precursor, the number of C—F bonds in one molecule which is a nonpolar site is preferably 100 or less, more preferably 70 or less, and even more preferably 50 or less. is there.
- the number of polyether groups, hydroxyl groups, carboxyl groups, or sulfo groups in one molecule, which is a polar site is preferably 1 or more.
- the number of polyether groups, hydroxyl groups, carboxyl groups, or sulfo groups in one molecule that are polar sites is preferably 100 or less, more preferably 70 or less, and even more preferably 50 or less.
- the maximum value of the molecular weight of the fluorosurfactant to be added is that the fluorosurfactant gathers at the interface between the polyimide resin layer and the inorganic substrate due to the solvent drying of the varnish and the heating in the curing process.
- the size is adjusted so as to obtain good peelability from the substrate. Therefore, the molecular weight of the fluorosurfactant is preferably 10,000 or less, and more preferably 5000 or less.
- the minimum molecular weight of the fluorosurfactant to be added is that the fluorosurfactant does not volatilize and remains in the polyimide resin layer by heating in the solvent drying and curing process of the varnish, and the polyimide resin layer inorganic substrate Is adjusted to such a size that good peelability can be obtained. Therefore, the molecular weight of the fluorosurfactant is preferably 50 or more, and more preferably 100 or more.
- silicone surfactants include polyoxyethylene (POE) -modified organopolysiloxane, polyoxyethylene / polyoxypropylene (POE / POP) -modified organopolysiloxane, POE sorbitan-modified organopolysiloxane, and POE glyceryl-modified organopolysiloxane. And organopolysiloxane modified with a hydrophilic group.
- POE polyoxyethylene
- POP polyoxypropylene
- DBE-712 DBE-821 (manufactured by Amax Co.), KF-6015, KF-6016, KF-6017, KF-6028 (manufactured by Shin-Etsu Chemical Co., Ltd.), ABIL-EM97 (manufactured by Goldschmidt), Polyflow KL-100, Polyflow KL-401, Polyflow KL-402, Polyflow KL-700 (manufactured by Kyoeisha Chemical Co., Ltd.) and the like can be mentioned.
- Fluorosurfactants include anionic fluorosurfactants such as perfluoroalkyl carboxylates, perfluoroalkyl phosphates, perfluoroalkyl sulfonates, perfluoroalkylethylene oxide adducts, and perfluoroalkyls.
- anionic fluorine-based surfactants such as amine oxide, perfluoroalkyl polyoxyethylene ethanol, perfluoroalkyl alkoxylate, and fluorinated alkyl ester can be exemplified.
- the addition amount of the component (b) added to the resin composition of the present embodiment is 0.001 mass relative to 100 mass parts of the polyimide or polyimide precursor from the viewpoint of peelability of the polyimide resin layer from the glass substrate. Part or more is preferable, and more preferably 0.01 part by weight or more. On the other hand, from the viewpoint of the adhesion of the polyimide resin layer to the glass substrate and the heat resistance of the polyimide, the addition amount is preferably 10 parts by mass or less, more preferably 5 parts by mass or less. When the addition amount is 10 parts by mass or less, contamination of the device due to generation of outgas can be prevented in the device manufacturing process.
- the addition amount of the component (b) can be measured by liquid chromatography mass spectrometry (LC-MS).
- the alkoxysilane compound according to the present embodiment is at least one selected from the group consisting of an amino group, a carbamate group, a carboxyl group, an aryl group, an acid anhydride group, an amide group, and a polymerizable cyclic ether group. It is not particularly limited as long as it is an alkoxysilane compound having a kind of functional group. By having these functional groups, compatibility with polyamic acid or polyimide is improved, polyimide by reaction with aromatic stacking, intermolecular interaction of imide, amino group or acid anhydride group in polyamic acid or polyimide Adhesion of the resin layer to the glass substrate is improved.
- the alkoxysilane compound according to the present embodiment has at least one functional group selected from the group of carbamate group, carboxyl group, amide group and aryl group, so that the release property of the polyimide resin layer from the glass substrate is good. From the viewpoint of becoming.
- the alkoxysilane compound according to the present embodiment is specifically a silane compound represented by the following general formula (I).
- R 1 represents an amino group, carbamate group, carboxyl group, aryl group, acid anhydride group, amide group in a linear, branched, or cyclic organic group having 1 to 20 carbon atoms.
- R 2 has a carbon atom number containing a photopolymerizable unsaturated double bond group or a polymerizable cyclic ether bond group 2-20 groups, aryl groups having 6-20 carbon atoms, alkylaryl groups having 2-20 carbon atoms, mercapto groups or alkyls having 1-20 carbon atoms which may be substituted with amino groups Group, a cycloalkyl group having 5 to 20 carbon atoms, or a group having 4 to 20 carbon atoms including a carboxyl group or a dicarboxylic anhydride group, and R 3 represents a methoxy group, an ethoxy group, a propoxy group, Iso At least one monovalent organic group selected from the group consisting of propoxy group, a hydroxyl group, or a chlorine (Cl), and a is an integer of 0 or 1.
- ⁇ ⁇
- the alkoxysilane compound having an amino group is an alkoxysilane compound having an amino group in a linear, branched, or cyclic organic group in which R 1 has 1 to 20 carbon atoms.
- R 1 has 1 to 20 carbon atoms.
- the alkoxysilane compound having a carbamate group is an alkoxysilane compound having a carbamate group in a linear, branched, or cyclic organic group in which R 1 has 1 to 20 carbon atoms.
- Examples include (3-trimethoxysilylpropyl) -t-butyl carbamate and (3-triethoxysilylpropyl) -t-butyl carbamate.
- the alkoxysilane compound having an acid anhydride group is an alkoxysilane compound having a dicarboxylic anhydride group in a linear, branched, or cyclic organic group having 1 to 20 carbon atoms in R 1. is there.
- Preferred organic groups as R 1 include, for example, a succinic anhydride group (R 1 -1), a cyclohexanedicarboxylic anhydride group (R 1 -2), a 4-methyl-cyclohexanedicarboxylic anhydride group (R 1- 3), 5-methyl-cyclohexanedicarboxylic anhydride group (R 1 -4), bicycloheptane dicarboxylic anhydride group (R 1 -5), 7-oxa-bicycloheptane dicarboxylic anhydride group (R 1 -6) ) And phthalic anhydride groups (R 1 -7).
- R 1 -1 succinic anhydride group
- R 1 -2 a cyclohexanedicarboxylic anhydride group
- R 1- 3 4-methyl-cyclohexanedicarboxylic anhydride group
- R 1 -4 4-methyl-cyclohexanedicarboxylic anhydride group
- the alkoxysilane compound having a carboxyl group is an alkoxysilane compound containing a carboxyl group in a linear, branched or cyclic organic group having 1 to 20 carbon atoms in R 1 .
- the alkoxysilane compound having an aryl group, number of carbon atoms of R 1 is 1 to 20 linear, branched, or in the cyclic organic group, 1 aromatic ring of 6 to 20 carbon atoms It is an alkoxysilane compound having two or more.
- An example is the hydrochloride of trimethoxysilane.
- the alkoxysilane compound having an amide group is an alkoxysilane having an amide group in a linear, branched, or cyclic organic group having 1 to 20 carbon atoms as R 1 in the general formula (I).
- the alkoxysilane compound having an amide group is a reaction of an alkoxysilane compound having an amino group with a carboxylic acid, an acid chloride, a dicarboxylic acid anhydride, or a tetracarboxylic acid anhydride, or a carboxyl group, an acid chloride group, or an acid anhydride. It is obtained by a reaction between an alkoxysilane compound having a physical group and an amine.
- an amino group-containing alkoxysilane compound and a dicarboxylic acid anhydride or a tetracarboxylic acid anhydride are obtained, or an acid anhydride group is obtained. It is preferable that it is an alkoxysilane compound which has an amide group obtained by reaction with the alkoxysilane compound which has and an amine.
- examples of the alkoxysilane compound having an amino group include the compounds described above.
- examples of the dicarboxylic acid anhydride include succinic anhydride, cyclohexane dicarboxylic acid anhydride, 4-methyl-cyclohexane dicarboxylic acid anhydride, 5-methyl-cyclohexane dicarboxylic acid anhydride, bicycloheptane dicarboxylic acid anhydride, 7-oxabicyclo Heptanedicarboxylic anhydride, tetrahydrophthalic anhydride, trimellitic anhydride, pyromellitic anhydride, adipic anhydride, phthalic anhydride, (3-trimethoxysilylpropyl) succinic anhydride, (3-tri And polybasic acid anhydrides such as ethoxysilylpropyl) succinic anhydride.
- tetracarboxylic acid anhydride examples include pyromellitic dianhydride, 3,3 ′, 4,4′-biphenyltetracarboxylic dianhydride, and 2,3,3 ′, 4′-biphenyltetracarboxylic acid.
- Acid dianhydride 2,2 ', 3,3'-biphenyltetracarboxylic dianhydride, p-phenylenebis (trimellitic acid monoester anhydride), 1,2,5,6-naphthalenetetracarboxylic acid Examples include dianhydrides, 2,3,6,7-naphthalenetetracarboxylic dianhydride, 3,3′-oxydiphthalic dianhydride, and 4,4′-oxydiphthalic dianhydride. These may be used alone or in combination of two or more.
- examples of the alkoxysilane compound having an acid anhydride group include the compounds described above.
- examples of amines include ammonia, methylamine, ethylamine, propylamine, isopropylamine, butylamine, t-butylamine, pentylamine, hexylamine, 2-ethylhexylamine, heptylamine, octylamine, nonylamine, decylamine, undecylamine, dodecylamine.
- the alkoxysilane compound having a polymerizable cyclic ether group refers to a linear, branched or cyclic organic group having 1 to 20 carbon atoms in R 1 , such as a glycidyl group or an epoxycyclohexyl group, It is an alkoxysilane compound having a reactive cyclic ether group.
- alkoxysilane compounds that can be added in combination with the above include methyltrimethoxysilane, methyltriethoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, diethyldimethoxysilane, diethyl Diethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, cyclohexyltrimethoxysilane, cyclohexyltriethoxysilane, cyclohexylmethyldimethoxysilane, cyclohexylmethyldiethoxysilane, dicyclopentyldimethoxysilane, dicyclopentyldiethoxysilane, octadecyltrimethoxysilane , Octadecyltriethoxysilane, 3-mercaptopropyltrime
- the amount of component (c) added to the resin composition of the present embodiment is 0.001 mass relative to 100 mass parts of the polyimide or polyimide precursor. Part or more is preferable, and more preferably 0.01 part by weight or more.
- the addition amount is preferably 9 parts by mass or less, more preferably 5 parts by mass or less.
- the amount of component (c) added can be measured by liquid chromatography mass spectrometry (LC-MS).
- the resin composition of the present embodiment may be dissolved in a solvent to take the form of a varnish-like resin composition.
- a solvent used here, N-methyl-2-pyrrolidone (NMP), ⁇ -butyrolactone, N, N-dimethylacetamide, N, N-dimethylformamide, dimethyl sulfoxide, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol dibutyl ether , Propylene glycol monomethyl ether, dipropylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, methyl lactate, ethyl lactate, butyl lactate, methyl-1,3-butylene glycol acetate, 1,3-butylene glycol-3-monomethyl ether, pyrubin
- NMP N-methyl-2-pyrrolidone
- ⁇ -butyrolactone N, N-dimethylacetamide, N, N-dimethylformamide, di
- aprotic polar solvents are more preferred, and specific examples include N-methyl-2-pyrrolidone (NMP) and ⁇ -butyrolactone. Particularly preferred is N-methyl-2-pyrrolidone (NMP).
- the amount of such a solvent used varies depending on the film thickness obtained, and is used in the range of 10 to 10,000 parts by mass with respect to 100 parts by mass of the polyimide or polyimide precursor.
- the resin composition and polyimide resin layer of the present embodiment may contain other components than those described above, but the other additive components do not affect the 180 ° peel strength between the polyimide resin and the inorganic substrate. The amount is adjusted so that both good adhesion and releasability can be achieved.
- the laminated body of the present embodiment is a varnish-like polyimide precursor composition which is converted to a polyimide having a 5% thermal decomposition temperature of 350 ° C. or higher by imidization treatment on an inorganic substrate and subjected to heat treatment.
- a method of forming a polyimide resin layer by polyimidizing a polyimide precursor, or by applying a polyimide composition having a 5% thermal decomposition temperature of 350 ° C. or more on an inorganic substrate and performing a heat treatment to remove the solvent can get.
- the inorganic substrate is preferably transparent from the viewpoint of positioning in the device forming step, and a glass substrate is particularly preferable.
- glass substrates alkali-free glass substrates, soda-lime glass substrates, quartz glass substrates, etc. are used, but alkali-free glass substrates are used in many semiconductor manufacturing processes, and alkali-free glass substrates as inorganic substrates. Is preferred.
- the inorganic substrate includes those obtained by treating the surface of the inorganic substrate with a coupling agent in advance in order to control adhesion and peelability with the polyimide composition film.
- the method for producing the laminate of the present embodiment can be performed by developing the resin composition of the present embodiment on an inorganic substrate and performing a heat treatment by a known method.
- Examples of the developing method include known coating methods such as spin coating, slit coating, and blade coating. Further, the heat treatment is performed on the inorganic substrate after the resin composition is developed, and is heat-treated at a temperature of 300 ° C. or lower for 1 to 300 minutes mainly for the purpose of solvent removal, and further at a temperature of 300 to 550 ° C. in an inert atmosphere such as nitrogen. The polyimide precursor is converted into a polyimide by heat treatment at 1 to 300 minutes.
- the laminate of the present embodiment exhibits excellent heat resistance, dimensional stability, and heat adhesion to an inorganic substrate by heat-treating the resin composition of the present embodiment. It can be applied as a substrate.
- a laminated body at a temperature exceeding 300 ° C. in an inert atmosphere such as a heat aging process or an excimer laser process when forming a low-temperature polysilicon thin semiconductor or oxide semiconductor, more specifically, at 300 ° C. to 500 ° C.
- the polyimide resin layer does not peel off and a device can be formed satisfactorily.
- the prepared polyimide resin layer can be peeled off.
- the “resin adhesive layer” is an inorganic layer or an organic layer provided on the surface of an inorganic substrate for resin adhesion. In the present embodiment, the resin adhesive layer may or may not be provided.
- the polyimide resin layer can be peeled cleanly from the inorganic substrate, and the polyimide resin layer can be formed without any defects on the peeled surface.
- 1 to 7 are schematic cross-sectional views showing the manufacturing process of a flexible display using the resin composition according to the present embodiment.
- a first substrate 11 made of an alkali-free glass substrate is prepared.
- a polyimide precursor resin composition that becomes a polyimide having a 5% thermal decomposition temperature of 350 ° C. or higher is applied to the surface of the first substrate 11 by the imidization treatment of the present embodiment described above.
- the first polyimide resin layer 12 is formed by a method of forming a polyimide by heat treatment or a method of applying a polyimide resin composition having a 5% thermal decomposition temperature of 350 ° C. or higher and then removing the solvent by heat treatment. To do.
- a first barrier layer 101 is formed on the first polyimide resin layer 12 of the first substrate 11.
- a semiconductor layer 102, a gate insulating film 103, a gate electrode 104, an interlayer insulating film 105, a contact hole 106, and source / drain electrodes 107a and 107b are sequentially formed on the first barrier layer 101.
- a thin film transistor (TFT) 108 is formed.
- the semiconductor layer 102 is formed of polysilicon.
- the semiconductor layer 102 is formed by first forming amorphous silicon, crystallizing it, and changing it to polysilicon.
- crystallization methods for example, RTA (Rapid Thermal Annealing), SPC (Solid Phase Crystallization), ELA (Excimer Laser Crystallization), MIC (Metal Induced Crystallization), and MI (Metal Induced Crystallization). Lateral Solidification).
- a display element is formed on the TFT 108.
- a planarization layer 109 is formed on the source / drain electrodes 107a and 107b.
- a contact hole 110 is formed in one electrode 107b of the source / drain electrodes 107a and 107b and is electrically connected to the first electrode 111.
- the 1st electrode 111 functions as one electrode among the electrodes with which an organic light emitting element is equipped later.
- a pixel definition film 112 patterned with an insulating material is formed on the first electrode 111 so that at least a part of the first electrode 111 is exposed.
- an intermediate layer 113 including a light emitting layer is formed on the exposed portion of the first electrode 111.
- a second electrode 114 facing the first electrode 111 is formed around the intermediate layer 113.
- the sealing member 201 shown in FIG. 5 is manufactured separately, and the sealing member 201 is coupled to the upper portion of the organic light emitting device, and then the second substrate 202 of the sealing member 201 is separated.
- the sealing member 201 has a second polyimide resin layer 203 formed on one main surface of a second substrate 202 made of an alkali-free glass substrate, for example, and further on the surface of the second polyimide resin layer 203.
- the second barrier layer 204 is formed.
- the second polyimide resin layer 203 can be formed using the resin composition of the present embodiment.
- FIG. 6 after the sealing member 201 is disposed on the organic light emitting element 210, these are bonded.
- heat treatment is performed in the state shown in FIG. 6 in the presence of oxygen, for example, at 300 ° C. to 350 ° C. in an air atmosphere. Accordingly, the first substrate 11 in contact with the first polyimide resin layer 12 can be peeled off, and the second substrate 202 in contact with the second polyimide resin layer 203 can be peeled off. As a result, a flexible display 100 as shown in FIG. 7 is obtained.
- the first polyimide resin layer 12 formed by polyimidizing the polyimide precursor has a 5% thermal decomposition temperature of 350 ° C. or higher. Has heat resistance to withstand.
- the semiconductor layer 102 can withstand a process such as polysilicon formation.
- An alkoxysilane compound having at least one functional group selected from the group consisting of an amino group, a carbamate group, a carboxyl group, an aryl group, an acid anhydride group, an amide group and a polymerizable cyclic ether group does not have these groups.
- it interacts with polyimide and is less likely to volatilize when the resin composition is heated, and is effectively incorporated into the polyimide resin layer during imidization / orientation at 400 ° C. or higher.
- the polyimide resin layer is maintained at a desired thickness, and exhibits good heat-resistant adhesion (long-term adhesion) during long-time heat treatment.
- the first substrate 11 and The laminated body composed of the first polyimide resin layer 12 is allowed to stand for 6 minutes to 5 hours until the temperature reaches 350 ° C. to 500 ° C. and the formation of polysilicon is completed.
- the first polyimide resin layer 12 is excellent in long-term adhesion by using the resin composition of the present embodiment, the first polyimide resin layer 12 becomes the first substrate 11 during the polysiliconization. It is possible to suppress the occurrence of problems such as peeling from the surface.
- the alkoxysilane compound is introduced into the polyimide by heat treatment when forming the polyimide, for example, it exhibits heat-resistant adhesion (initial adhesion) exceeding 400 ° C. in an inert atmosphere. Thereby, in the manufacture of the flexible display 100, there is an effect of suppressing the appearance abnormality.
- the resin composition and the polyimide resin layer of the present embodiment have a silicone surfactant or a fluorosurfactant. Thereby, the peelability with respect to an inorganic substrate can be improved.
- a polyimide resin layer while adding a silicone surfactant or a fluorine-type surfactant to a polyimide or a polyimide precursor, and adding the alkoxysilane compound which has a predetermined functional group, a polyimide resin layer It is possible to form a resin composition having good adhesion and peelability to an inorganic substrate and a laminate using the resin composition.
- the polysilicon semiconductor driven flexible display has been described as an example.
- the flexible device manufacturing method according to the present embodiment is also applied to a metal oxide semiconductor driven flexible device such as IGZO. can do.
- the glass substrate from which the polyimide resin layer has been peeled off by the method of the present embodiment can peel off the polyimide resin layer entirely from the glass substrate due to easy release of polyimide. Therefore, it is possible to recycle the used glass substrate by passing the glass substrate surface through an easy glass substrate cleaning process using oxygen plasma, acid, or alkali solution.
- the flexible device substrate in the present invention has a flexible film shape, for example, and is used for flexible devices such as flexible memories, sensors, and RF-IDs. Typically used for flexible displays.
- the surface of the flexible device substrate that forms the functional layers of the device has high flatness.
- the film thickness variation of the flexible device substrate must be reduced.
- the flexible device substrate is required to have good flexibility, and in order to obtain good flexibility, the thickness together with the composition of the flexible device substrate is also an important factor.
- the flexible device substrate having flexibility is carried, for example, to a roll-to-roll process and used for a device formation process. Therefore, in general, the flexible device substrate is marketed in the state of a flexible device including each functional layer of the device, but the flexible device substrate may be marketed alone.
- the substrate for a flexible device of the present embodiment includes ( ⁇ ) a polyimide having a 5% thermal decomposition temperature of 350 ° C. or higher, ( ⁇ ) a chemical structure represented by the following general formula (1) and / or the following general formula (2). ( ⁇ ) a compound having a chemical structure represented by the following general formula (3), a compound having one or more of the group consisting of a hydroxyl group, a carboxyl group and a sulfo group, ( ⁇ ) The compound which has a chemical structure represented by Formula (4) is contained.
- the polyimide used in the present embodiment has a 5% thermal decomposition temperature of 350 ° C. or higher.
- Such a polyimide is typically obtained by imidizing a polyimide precursor obtained by reacting tetracarboxylic dianhydride and diamine by heat treatment or the like.
- the polyimide precursor used here is pyromellitic dianhydride, 3,3 ′, 4,4′-biphenyltetracarboxylic dianhydride, 2,3,3 ′, in terms of heat resistance and mechanical strength.
- the polyimide or polyimide precursor consists of a fluorine-containing aromatic acid dianhydride, an alicyclic acid dianhydride, and a sulfur-containing acid dianhydride as a tetracarboxylic dianhydride. It is a polyimide or polyamic acid obtained by reacting at least one selected from the group consisting of fluorine group-containing aromatic diamine, alicyclic diamine, and sulfur-containing diamine as at least one selected from the group, or diamine. It is preferable.
- Fluorine group-containing aromatic acid dianhydrides include 2,2-bis (3,4-dicarboxyphenyl) hexafluoropropane dianhydride, 2,2-bis (4- (3,4-dicarboxyphenoxy) Phenyl) hexafluoropropane dianhydride, 2,2-bis (4- (3,4-dicarboxybenzoyloxy) phenyl) hexafluoropropane dianhydride, and 2,2′-bis (trifluoromethyl)- 4,4′-bis (3,4-dicarboxyphenoxy) biphenyl dianhydride and the like.
- alicyclic acid dianhydrides examples include bicyclo [2,2,2] oct-7-ene-2,3,5,6-tetracarboxylic dianhydride, 2,3,5,6-cyclohexanetetracarboxylic Acid dianhydride, 3,3 ′, 4,4′-bicyclohexyltetracarboxylic dianhydride, 1,2,3,4-cyclopentanetetracarboxylic dianhydride, cyclobutanetetracarboxylic dianhydride, etc. Can be mentioned.
- sulfur-containing dianhydride examples include bis (3,4-dicarboxyphenyl) sulfone dianhydride.
- Fluorine group-containing aromatic diamines include 1,1,1,3,3,3-hexafluoro-2,2-bis (4-amino-phenyl) propane and 2,2′-bis (trifluoromethyl) benzidine 2,2-bis (3-amino-4-hydroxyphenyl) hexafluoropropane, 2,2′-bis (3-amino-2,4-dihydroxyphenyl) hexafluoropropane, 2,2′-bis (4 -Amino-3,5-dihydroxyphenyl) hexafluoropropane, 2,2-bis [4- (3-amino-phenoxy) phenyl] -1,1,1,3,3,3-hexafluoropropane, 2, Examples thereof include 2-bis [4- (4-amino-phenoxy) phenyl] -1,1,1,3,3,3-hexafluoropropane.
- Examples of the alicyclic diamine include 1,4-diaminocyclohexane, 1,3-diaminocyclohexane, 4,4′-diaminodicyclohexylmethane, 4,4′-diaminodicyclohexylpropane, and 2,3-diaminobicyclo [2.2.
- sulfur-containing diamine examples include 4,4 ′-(or 3,4′-, 3,3′-, 2,4 ′-) diamino-diphenylsulfone, 4,4 ′-(or 3,4′-, 3 , 3′-, 2,4 ′-) diamino-diphenyl sulfide, 4,4′-di (4-amino-phenoxy) phenyl sulfone, 4,4′-di (3-amino-phenoxy) phenyl sulfone, 3, 3'-diamino-diphenylsulfone, 3,3'-dimethyl-4,4'-diamino-biphenyl-6,6'-disulfone, bis (3-amino-phenyl) sulfide, bis (4-amino-phenyl) sulfide Bis (3-amino-phenyl) sulfoxide, bis (4-amino-phenyl) sulfoxide,
- tetracarboxylic dianhydrides include 3,3 ′, 4,4′-benzophenone tetracarboxylic dianhydride, 2,3,3 ′, 4′-benzophenone tetracarboxylic dianhydride, 2 , 2 ′, 3,3′-benzophenone tetracarboxylic dianhydride and the like. These tetracarboxylic dianhydrides may be used alone or in admixture of two or more.
- tetracarboxylic dianhydride other conventionally known tetracarboxylic dianhydrides can be used as long as the effects of the present embodiment are exhibited.
- Examples of other tetracarboxylic dianhydrides include 2,2-bis (3,4-dicarboxyphenyl) propane dianhydride and 2,2-bis (2,3-dicarboxyphenyl) propane dianhydride. 1,1-bis (3,4-dicarboxyphenyl) ethane dianhydride, 1,1-bis (2,3-dicarboxyphenyl) ethane dianhydride, bis (3,4-dicarboxyphenyl) methane Dianhydride, bis (2,3-dicarboxyphenyl) methane dianhydride, 2,2-bis (4- (4-amino-phenoxy) phenyl) propane, 1,3-dihydro-1,3-dioxo- 5-Isobenzofurancarboxylic acid-1,4-phenylene ester, 4- (2,5-dioxotetrahydrofuran-3-yl) -1,2,3,4-tetrahydronaphthalene-1,2-dicar
- Examples of other diamines that can be used include the following. 3,3′-dimethyl-4,4′-diamino-biphenyl, 2,2′-dimethyl-4,4′-diamino-biphenyl, 3,3′-diethyl-4,4′-diamino-biphenyl, 2, 2'-diethyl-4,4'-diamino-biphenyl, 1,4-cyclohexyldiamine, p-xylylenediamine, m-xylylenediamine, 1,5-diamino-naphthalene, 3,3'-dimethoxybenzidine, 4 , 4 '-(or 3,4'-, 3,3'-, 2,4'-) diamino-diphenylmethane, 4,4 '-(or 3,4'-, 3,3'-, 2,4 '-) Diamino-diphenyl ether, 4,4'-benzophenonediamine,
- diamines may be used alone or in combination of two or more.
- a method for producing the polyimide precursor all methods that can produce a polyimide precursor, including known methods, can be applied. Among these, it is preferable to perform the reaction in an organic solvent.
- solvent used in such a reaction examples include N, N-dimethylformamide, N, N-dimethylacetamide, N-methyl-2-pyrrolidone, ⁇ -butyrolactone, 1,2-dimethoxyethane, tetrahydrofuran, 1,3 -Dioxane, 1,4-dioxane, dimethyl sulfoxide, benzene, toluene, xylene, mesitylene, phenol, cresol, ethyl benzoate and butyl benzoate. These may be used alone or in combination of two or more.
- N, N-dimethylformamide, N, N-dimethylacetamide, N-methyl-2-pyrrolidone and ⁇ -butyrolactone are preferable, and N-methyl-2-pyrrolidone is particularly preferable.
- the concentration of the reaction raw material in this reaction is usually 2% by mass to 80% by mass, preferably 5% by mass to 30% by mass.
- the molar ratio of tetracarboxylic dianhydride to be reacted and diamine is in the range of 0.8 to 1.2. Within this range, the molecular weight can be increased, and the elongation and the like are excellent.
- the molar ratio is preferably 0.9 to 1.1, more preferably 0.92 to 1.07.
- the weight average molecular weight of the polyimide precursor is preferably 1,000 or more and 1,000,000 or less.
- the weight average molecular weight refers to a molecular weight measured by gel permeation chromatography using polystyrene having a known number average molecular weight as a standard.
- the weight average molecular weight is more preferably from 10,000 to 500,000, and most preferably from 20,000 to 300,000.
- the weight average molecular weight is 1,000 or more and 1,000,000 or less, the strength and elongation of the resin layer obtained using the resin composition is improved, and the mechanical properties are excellent. Furthermore, it can be applied without bleeding at a desired film thickness during processing such as coating.
- the polyimide precursor is obtained by the following method. First, polyamic acid is produced by subjecting the reaction raw material to a polycondensation reaction from room temperature to 80 ° C.
- the end of the polymer main chain of the polyimide precursor can be end-capped with an end-capping agent made of a monoamine derivative or a carboxylic acid derivative.
- an end-capping agent made of a monoamine derivative or a carboxylic acid derivative.
- terminal blocking agent comprising a monoamine derivative
- examples of the terminal blocking agent comprising a monoamine derivative include aniline, o-toluidine, m-toluidine, p-toluidine, 2,3-xylidine, 2,6-xylidine, 3,4-xylidine, and 3,5-xylidine.
- Examples of the end-capping agent comprising a carboxylic acid derivative mainly include carboxylic anhydride derivatives.
- carboxylic anhydride derivative examples include phthalic anhydride, 2,3-benzophenone dicarboxylic anhydride, 3,4-benzophenone dicarboxylic anhydride, 2,3-dicarboxyphenyl phenyl ether anhydride, 3,4-di Carboxyphenyl phenyl ether anhydride, 2,3-biphenyl dicarboxylic acid anhydride, 3,4-biphenyl dicarboxylic acid anhydride, 2,3-dicarboxyphenyl phenyl sulfone anhydride, 3,4-dicarboxyphenyl phenyl sulfone anhydride 2,3-dicarboxyphenyl phenyl sulfide anhydride, 3,4-dicarboxyphenyl phenyl sulfide anhydride, 1,2-naphthalenedicarboxylic anhydride, 2,3-naphthalenedicarboxylic anhydride, 1,8-naphthal
- the obtained polyimide precursor solution may be used as it is without removing the solvent, and may further be used as a resin composition according to the present embodiment by blending necessary solvents, additives and the like. Then, as will be described later, this resin composition is applied to the surface of the inorganic substrate, subjected to a predetermined heat treatment or the like to form a polyimide resin layer, and peeled off from the inorganic substrate, thereby forming a flexible resin composed of the polyimide resin layer.
- a device substrate can be obtained.
- This flexible device substrate includes a polyimide having a 5% thermal decomposition temperature of 350 ° C. or higher in a state where a predetermined heat treatment is performed on the polyimide or the polyimide precursor.
- the compound having the chemical structure represented by the general formula (1) is a compound derived from a bifunctional silicone compound.
- examples of this compound include silicone oils typified by dimethylsiloxane and modified products thereof, or silicone surfactants having a hydrophilic group bonded to dimethylsiloxane.
- This compound should just have the structure of General formula (1) in the molecule
- this compound may be reacted and decomposed by heat in the flexible device substrate.
- surface tension can be controlled and the surface roughness of the substrate for flexible devices can be reduced.
- the compound having the chemical structure represented by the general formula (2) is a compound derived from a fluorinated hydrocarbon.
- a typical example of this compound is a fluorosurfactant, specifically, an anionic fluorosurfactant such as perfluoroalkyl carboxylate, perfluoroalkyl phosphate, perfluoroalkyl sulfonate, Nonionic fluorinated surfactants such as perfluoroalkylethylene oxide adducts, perfluoroalkylamine oxides, perfluoroalkyl polyoxyethylene ethanol, perfluoroalkyl alkoxylates, fluorinated alkyl esters and the like can be mentioned.
- the compound represented by the general formula (2) it is only necessary to have a structure derived from a fluorinated hydrocarbon. Therefore, the above fluorosurfactant itself may be used, or the fluorosurfactant. Those obtained by removing the hydrophilic group may be used.
- this compound may be reacted and decomposed by heat in the flexible device substrate.
- surface tension can be controlled and the surface roughness of the substrate for flexible devices can be reduced.
- the compound having one or more chemical groups represented by the general formula (3), a hydroxyl group, a carboxyl group, and a sulfo group is a compound derived from a surfactant.
- Typical examples of this compound are silicone-based and fluorine-based surfactants.
- examples of this compound include silicone-based surfactants having a hydrophilic group bonded to dimethylsiloxane, perfluoroalkyl carboxylates, perfluoroalkyls.
- Anionic fluorosurfactants such as phosphate esters and perfluoroalkyl sulfonates, perfluoroalkyl ethylene oxide adducts, perfluoroalkyl amine oxides, perfluoroalkyl polyoxyethylene ethanol, perfluoroalkyl alkoxylates, fluorine Nonionic fluorine-based surfactants such as alkylated alkyl esters.
- phosphate esters and perfluoroalkyl sulfonates perfluoroalkyl ethylene oxide adducts, perfluoroalkyl amine oxides, perfluoroalkyl polyoxyethylene ethanol, perfluoroalkyl alkoxylates
- fluorine Nonionic fluorine-based surfactants such as alkylated alkyl esters.
- the compound represented by the general formula (3) it is only necessary to have a hydrophilic group of a surfactant. Therefore, the above-mentioned silicone-based
- this compound may react and decompose by heat in the substrate for flexible devices.
- surface tension can be controlled and the surface roughness of the substrate for flexible devices can be reduced.
- the compound having the chemical structure represented by the general formula (4) is a compound derived from a trifunctional silicone compound.
- this compound include hydrolysis condensates of trifunctional alkoxysilanes.
- Trifunctional alkoxysilanes used to obtain this compound include aminopropyltrimethoxysilane, aminopropyltriethoxysilane, N-2- (aminoethyl) -3-aminopropyltrimethoxysilane, N-2- (aminoethyl).
- this compound may react and decompose by heat in the flexible device substrate.
- this compound is included, the film thickness dispersion
- the addition amount of the ( ⁇ ) component contained in the flexible device substrate of the present embodiment is 0.0001 to 9 parts by mass with respect to 100 parts by mass of the ( ⁇ ) polyimide from the viewpoint of film thickness uniformity and flexibility.
- the amount is preferably part by mass, more preferably 0.001 part by mass to 5 parts by mass.
- the addition amount of the ( ⁇ ) component contained in the flexible device substrate of the present embodiment is 0.0001 parts by mass with respect to 100 parts by mass of the polyimide ( ⁇ ) from the viewpoint of film thickness uniformity and flexibility. It is preferably from 10 parts by mass, more preferably from 0.0001 parts by mass to 5 parts by mass.
- 1 to 7 are schematic cross-sectional views showing the manufacturing process of a flexible display using the resin composition according to the present embodiment.
- a first substrate 11 made of an alkali-free glass substrate is prepared.
- a polyimide precursor resin composition that becomes a polyimide having a 5% thermal decomposition temperature of 350 ° C. or higher by the imidization treatment of the present embodiment described above.
- the first polyimide resin layer 12 is then applied by a method of applying a polyimide by heat treatment or a polyimide resin composition having a 5% thermal decomposition temperature of 350 ° C. or higher and then removing the solvent by heat treatment.
- a first barrier layer 101 is formed on the first polyimide resin layer 12 of the first substrate 11.
- a semiconductor layer 102, a gate insulating film 103, a gate electrode 104, an interlayer insulating film 105, a contact hole 106, and source / drain electrodes 107a and 107b are sequentially formed on the first barrier layer 101.
- a thin film transistor (TFT) 108 is formed.
- the semiconductor layer 102 is formed of polysilicon.
- the semiconductor layer 102 is formed by first forming amorphous silicon, crystallizing it, and changing it to polysilicon.
- crystallization methods for example, RTA (Rapid Thermal Annealing), SPC (Solid Phase Crystallization), ELA (Excimer Laser Crystallization), MIC (Metal Induced Crystallization), and MI (Metal Induced Crystallization). Lateral Solidification).
- a display element is formed on the TFT 108.
- a planarization layer 109 is formed on the source / drain electrodes 107a and 107b.
- a contact hole 110 is formed in one electrode 107b of the source / drain electrodes 107a and 107b and is electrically connected to the first electrode 111.
- the 1st electrode 111 functions as one electrode among the electrodes with which an organic light emitting element is equipped later.
- a pixel defining film 112 patterned with an insulating material is formed on the first electrode 111 so as to expose at least a part thereof.
- an intermediate layer 113 including a light emitting layer is formed on the exposed portion of the first electrode 111.
- a second electrode 114 facing the first electrode 111 is formed around the intermediate layer 113.
- the sealing member 201 shown in FIG. 5 is manufactured separately, and the sealing member 201 is coupled to the upper portion of the organic light emitting device, and then the second substrate 202 of the sealing member 201 is separated.
- the sealing member 201 has a second polyimide resin layer 203 formed on one main surface of a second substrate 202 made of an alkali-free glass substrate, for example, and further on the surface of the second polyimide resin layer 203.
- the second barrier layer 204 is formed.
- the second polyimide resin layer 203 can be formed using the resin composition of the present embodiment.
- FIG. 6 after the sealing member 201 is disposed on the organic light emitting element 210, these are bonded.
- Each of the first polyimide resin layer 12 and the second polyimide resin layer 203 corresponds to a flexible device substrate.
- the flexible device substrate is a thin film-like insulating substrate having flexibility.
- a substrate generally refers to a base material or a support member that can form a functional layer on the surface thereof, but a flexible plate-like material that is bonded to the surface of a device and has a covering function or a protective function. Including.
- the flexible device includes ( ⁇ ) a polyimide having a 5% thermal decomposition temperature of 350 ° C. or higher, ( ⁇ ) a chemical structure represented by the above general formula (1) and / or the above general formula (2). ) A compound having a chemical structure represented by ( ⁇ ), ( ⁇ ) a compound having one or more of the group consisting of a chemical structure represented by the above general formula (3), a hydroxyl group, a carboxyl group, and a sulfo group, ( ⁇ ) It can be set as the structure containing the polyimide resin layer containing the compound which has a chemical structure represented by said General formula (4), and the polyimide resin layer does not need to comprise the board
- the polyimide resin layer may be a layer present in the flexible device as well as a layer appearing on the surface of the flexible device.
- the flexible device substrate of the present embodiment described above has the following effects. That is, in this embodiment, the film thickness variation of the flexible device substrate can be reduced.
- the film thickness can be measured, for example, with an optical film thickness meter.
- the thickness of the flexible device substrate of the present embodiment is preferably 5 ⁇ m to 200 ⁇ m.
- the thickness is preferably 10 ⁇ m to 30 ⁇ m. If it is 5 ⁇ m or more, it is excellent in mechanical strength, and if it is 200 ⁇ m or less, it is excellent in flexibility and lightness.
- the film thickness variation of the substrate can be suppressed to 50 nm or less (film thickness variation with respect to a width of 10 cm) with respect to the above-described thin thickness dimension.
- a flexible device manufactured using the flexible device substrate of the present embodiment or a flexible device having a flexible polyimide resin layer exhibits good in-plane uniformity in property evaluation such as electrical properties. Can do. This is because the film thickness variation of the substrate for flexible devices is small and the flatness of the substrate surface is high, so that each layer constituting the device, which is formed on the substrate surface, can be uniformly formed in the plane.
- NMP N-methyl-2-pyrrolidone
- Example 1 to 26 and Comparative Examples 1 to 4 Preparation of polyamic acid and polyimide composition
- Various components were prepared and mixed as shown in Table 1 and Table 2. This was pressure filtered through a PTFE filter having a pore size of 2.5 microns to obtain varnish compositions of Examples 1 to 26 and Comparative Examples 1 to 4.
- the used (B) silicone compound or fluorine compound and (C) alkoxysilane compound are as follows.
- the alkoxysilane compound included in Comparative Example 4 is methyltrimethoxysilane, and is selected from the group consisting of an amide group, an amino group, a carbamate group, a carboxyl group, an aryl group, an acid anhydride group, and a polymerizable cyclic ether group. This does not correspond to an alkoxysilane compound having at least one functional group.
- Adhesion of the cured polyimide resin layer (in Tables 3 and 4, referred to as post-cure adhesion)
- the adhesion between the non-alkali glass substrate and the polyimide resin layer was About the property, the state of the coating film was confirmed visually by the following criteria.
- 180 ° peel strength evaluation (referred to as 180 ° peel strength in Tables 3 and 4)
- a varnish-like composition obtained in Examples 1 to 26 and Comparative Examples 1 to 4 was coated on a glass substrate, and after curing, a polyimide resin layer having a thickness of 20 ⁇ m was cut into a length of 10 mm and a width of 10 mm, and a width of 10 mm.
- the width of 1.0 mm at the center of was masked with tape.
- the humidity is adjusted for 24 hours or more in an environment of temperature 23 ⁇ 2 ° C. and humidity 50 ⁇ 5% RH, and in that environment, a 1.0 mm wide polyimide resin layer masked with tape is peeled from the glass substrate at an angle of 180 °.
- the stress was measured at a peeling rate of 50 mm / min.
- A The polyimide resin layer adhered to the glass substrate can be easily peeled off.
- ⁇ The polyimide resin layer in close contact with the glass substrate is in close contact, and there is a catch at the time of peeling, but the polyimide resin layer can be peeled off without tearing.
- X The polyimide resin layer is not adhered to the glass substrate, or the polyimide resin layer is adhered and does not peel off, and the film is torn.
- the polyimide resin layer is peeled from the inorganic substrate.
- the component (c) has at least one functional group selected from the group consisting of a carbamate group, a carboxyl group, an amide group and an aryl group.
- the resin compositions according to Examples 1 to 26 can be suitably used as a substrate for a flexible device, and the laminate can be suitably used as a substrate for producing a flexible device.
- Example 27 (A) P-1 shown in Synthesis Example 1 as a polyamic acid, (B) DBE-712 (manufactured by AMAX Co.) as a silicone compound, (C) 3-aminopropyltriethoxysilane and phthalic anhydride as an alkoxysilane compound (D) N-methyl-2-pyrrolidone (NMP) as a solvent was prepared and mixed at a mass ratio of 10.0: 0.05: 0.05: 89.90. This was pressure filtered with a PTFE filter having a pore size of 2.5 microns to obtain a varnish-like composition.
- NMP N-methyl-2-pyrrolidone
- the varnish-like composition was coated on a non-alkali glass substrate whose surface was cleaned by an alkali cleaning method and a plasma cleaning method using a bar coater so that the film thickness after curing was 20 ⁇ m.
- the obtained coating film was cured under conditions of 140 ° C. ⁇ 1 hr + 250 ° C. ⁇ 1 hr + 350 ° C. ⁇ 1 hr.
- Example 28 (A) P-1 shown in Synthesis Example 1 as polyamic acid, (B) LE-605 (manufactured by Kyoeisha Chemical Co., Ltd.) as fluorine compound, (C) 3-aminopropyltriethoxysilane and phthalic anhydride as alkoxysilane compound (D) N-methyl-2-pyrrolidone (NMP) as a solvent was prepared and mixed at a mass ratio of 10.0: 0.09: 0.01: 89.90. This was pressure filtered with a PTFE filter having a pore size of 2.5 microns to obtain a varnish-like composition.
- NMP N-methyl-2-pyrrolidone
- the varnish-like composition was coated on a non-alkali glass substrate whose surface was cleaned by an alkali cleaning method and a plasma cleaning method using a bar coater so that the film thickness after curing was 20 ⁇ m.
- the obtained coating film was cured under conditions of 140 ° C. ⁇ 1 hr + 250 ° C. ⁇ 1 hr + 350 ° C. ⁇ 1 hr.
- the varnish-like composition was coated on a non-alkali glass substrate whose surface was cleaned by an alkali cleaning method and a plasma cleaning method using a bar coater so that the film thickness after curing was 20 ⁇ m.
- the obtained coating film was cured under conditions of 140 ° C. ⁇ 1 hr + 250 ° C. ⁇ 1 hr + 350 ° C. ⁇ 1 hr.
- the varnish-like composition was coated on a non-alkali glass substrate whose surface was cleaned by an alkali cleaning method and a plasma cleaning method using a bar coater so that the film thickness after curing was 20 ⁇ m.
- the obtained coating film was cured under conditions of 140 ° C. ⁇ 1 hr + 250 ° C. ⁇ 1 hr + 350 ° C. ⁇ 1 hr.
- the varnish-like composition was coated on a non-alkali glass substrate whose surface was cleaned by an alkali cleaning method and a plasma cleaning method using a bar coater so that the film thickness after curing was 20 ⁇ m.
- the obtained coating film was cured under conditions of 140 ° C. ⁇ 1 hr + 250 ° C. ⁇ 1 hr + 350 ° C. ⁇ 1 hr.
- ⁇ Sputter cleaning conditions> Measurement condition
- the vertical axis represents Total Counts (0.0005 amu).
- the vertical axis represents Total Counts (0.0009 amu). Although not described, the right end of the horizontal axis in FIG. 10 indicates 59.5.
- the vertical axis represents Total Counts (0.0008 amu). Although not shown, the left end of the horizontal axis in FIG. 11 indicates 44.5, and the right end indicates 45.5.
- Example 29 The laminated body obtained in Example 27 was used as a substrate for manufacturing a flexible device, and a first barrier layer was formed on the laminated body. Further, on the first barrier layer, a semiconductor layer, a gate insulating film, a gate electrode, an interlayer insulating film, a contact hole, and a source / drain electrode were sequentially formed to form a thin film transistor (TFT). Thereafter, the TFT device was peeled from the alkali-free glass substrate to obtain a flexible TFT device. The current-voltage characteristics of the obtained flexible TFT device were evaluated and confirmed to show good in-plane uniformity.
- TFT thin film transistor
- Example 30 Using the laminate obtained in Example 28 as a substrate for manufacturing a flexible device, a first barrier layer was formed on the laminate. Further, on the first barrier layer, a semiconductor layer, a gate insulating film, a gate electrode, an interlayer insulating film, a contact hole, and a source / drain electrode were sequentially formed to form a thin film transistor (TFT). Thereafter, the TFT device was peeled from the alkali-free glass substrate to obtain a flexible TFT device. The current-voltage characteristics of the obtained flexible TFT device were evaluated and confirmed to show good in-plane uniformity.
- TFT thin film transistor
- the present invention is not limited to this.
- the present invention can also be applied to other flexible devices such as solar cell substrates, flexible wiring boards, and flexible memories.
- the present invention can be used, for example, as a substrate, particularly in the production of flexible devices, and can be suitably used, for example, in the production of flexible displays and solar cells.
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Abstract
Description
本実施の形態に係る積層体は、無機基板と、前記無機基板の表面上に設けられ、(a)5%熱分解温度が350℃以上のポリイミドを含むポリイミド樹脂層と、を具備し、前記ポリイミド樹脂層と前記無機基板との180°ピール強度が0.004~0.250N/cmである。
本実施の形態の樹脂組成物は、(a)5%熱分解温度が350℃以上のポリイミド又は5%熱分解温度が350℃以上のポリイミドとなるポリイミド前駆体と、(b)シリコーン系界面活性剤又はフッ素系界面活性剤と、(c)アミノ基、カルバメート基、カルボキシル基、アリール基、酸無水物基、アミド基及び重合性環状エーテル基からなる群から選ばれる少なくとも1種の官能基を有するアルコキシシラン化合物とを含む。
以下、本実施の形態に係る樹脂組成物の各構成要件について詳細に説明する。
本実施の形態に係るポリイミド又はポリイミド前駆体は、テトラカルボン酸二無水物とジアミンを反応することにより得られる。なお、ポリイミド前駆体とは、イミド化によりポリイミドとなるものを意味し、ポリアミック酸のみを意味するものではなく、ポリアミック酸の一部がイミド化したものや、ポリアミック酸エステルも含む。この中でも、使用する溶媒への溶解性とポリイミド化後の耐熱性の観点から、ポリアミック酸が好ましい。
3,3’-ジメチル-4,4’-ジアミノ-ビフェニル、2,2’-ジメチル-4,4’-ジアミノ-ビフェニル、3,3’-ジエチル-4,4’-ジアミノ-ビフェニル、2,2’-ジエチル-4,4’-ジアミノ-ビフェニル、1,4-シクロヘキシルジアミン、p-キシリレンジアミン、m-キシリレンジアミン、1,5-ジアミノ-ナフタレン、3,3’-ジメトキシベンジジン、4,4’-(又は3,4’-、3,3’-、2,4’-)ジアミノ-ジフェニルメタン、4,4’-(又は3,4’-、3,3’-、2,4’-)ジアミノ-ジフェニルエーテル、4,4’-ベンゾフェノンジアミン、3,3’-ベンゾフェノンジアミン、4,4’-ビス(4-アミノ-7フェノキシ)ビフェニル、1,4-ビス(4-アミノ-フェノキシ)ベンゼン、1,3-ビス(4-アミノ-フェノキシ)ベンゼン、2,2-ビス[4-(4-アミノ-フェノキシ)フェニル]プロパン、3,3-ジメチル-4,4’-ジアミノ-ジフェニルメタン、3,3’,5,5’-テトラメチル-4,4’-ジアミノ-ジフェニルメタン、2,2’-ビス(4-アミノ-フェニル)プロパン、5,5’-メチレン-ビス-(アントラニル酸)、3,5-ジアミノ-安息香酸、3,3’-ジヒドロキシ-4,4’-ジアミノ-ビフェニル等の芳香族ジアミン
これらのジアミンは、単独で用いてもよく、2種以上を混合して用いてもよい。
本実施の形態に係るシリコーン系界面活性剤は、非極性部位としてシロキサン構造を有しているものであれば特に限定されないが、非極性部位として分子内に2以上1000以下のSi-O結合を有し、極性部位として分子内に1以上100以下のポリエーテル基、水酸基、カルボキシル基、又はスルホ基を有するシリコーン系界面活性剤であることが好ましい。
本実施の形態に係るアルコキシシラン化合物は、アミノ基、カルバメート基、カルボキシル基、アリール基、酸無水物基、アミド基及び重合性環状エーテル基からなる群から選ばれる少なくとも1種の官能基を有するアルコキシシラン化合物であれば特に限定されない。これらの官能基を有することで、ポリアミック酸又はポリイミドとの相溶性が向上し、芳香族スタッキングやイミドの分子間相互作用、ポリアミック酸又はポリイミド中のアミノ基又は酸無水物基との反応によるポリイミド樹脂層のガラス基板への密着性が向上する。
R1R2 aSi(R3)3-a ・・・(I)
{式中、R1は、炭素原子数が1~20の直鎖状、分岐鎖状、又は環状の有機基中にアミノ基、カルバメート基、カルボキシル基、アリール基、酸無水物基、アミド基及び重合性環状エーテル基の群より選ばれる少なくとも1種の官能基を有する有機基であり、R2は、光重合性不飽和二重結合基若しくは重合性環状エーテル結合基を含む炭素原子数が2~20の基、炭素原子数が6~20のアリール基、炭素原子数が2~20のアルキルアリール基、メルカプト基若しくはアミノ基で置換されていてもよい炭素原子数が1~20のアルキル基、炭素原子数が5~20のシクロアルキル基、又はカルボキシル基若しくはジカルボン酸無水物基を含む炭素原子数が4~20の基であり、R3は、メトキシ基、エトキシ基、プロポキシ基、イソプロポキシ基から成る群より選ばれる少なくとも1種の一価の有機基、水酸基、又は塩素(Cl)であり、そしてaは0又は1の整数である。}
本実施の形態の樹脂組成物は、溶媒に溶解し、ワニス状の樹脂組成物としての形態をとっても良い。ここで用いられる溶媒としては、N-メチル-2-ピロリドン(NMP)、γ-ブチロラクトン、N,N-ジメチルアセトアミド、N,N-ジメチルホルムアミド、ジメチルスルホキシド、ジエチレングリコールジメチルエーテル、ジエチレングリコールジエチルエーテル、ジエチレングリコールジブチルエーテル、プロピレングリコールモノメチルエーテル、ジプロピレングリコールモノメチルエーテル、プロピレングリコールモノメチルエーテルアセテート、乳酸メチル、乳酸エチル、乳酸ブチル、メチル-1,3-ブチレングリコールアセテート、1,3-ブチレングリコール-3-モノメチルエーテル、ピルビン酸メチル、ピルビン酸エチル、メチル-3-メトキシプロピオネート等が挙げられ、単独でも混合して用いても良い。
本実施の形態のフレキシブルデバイス用基板は、(α)5%熱分解温度が350℃以上のポリイミド、(β)下記一般式(1)で表される化学構造及び/又は下記一般式(2)で表される化学構造を有する化合物、(γ)下記一般式(3)で表される化学構造、水酸基、カルボキシル基及びスルホ基からなる群のうち1種以上を有する化合物、(δ)下記一般式(4)で表される化学構造を有する化合物を含有する。
<ポリイミド>
本実施の形態で用いられるポリイミドは、5%熱分解温度が350℃以上のものである。このようなポリイミドは、典型的には、テトラカルボン酸二無水物とジアミンを反応することにより得られるポリイミド前駆体を加熱処理などによりイミド化することによって得られる。
3,3’-ジメチル-4,4’-ジアミノ-ビフェニル、2,2’-ジメチル-4,4’-ジアミノ-ビフェニル、3,3’-ジエチル-4,4’-ジアミノ-ビフェニル、2,2’-ジエチル-4,4’-ジアミノ-ビフェニル、1,4-シクロヘキシルジアミン、p-キシリレンジアミン、m-キシリレンジアミン、1,5-ジアミノ-ナフタレン、3,3’-ジメトキシベンジジン、4,4’-(又は3,4’-、3,3’-、2,4’-)ジアミノ-ジフェニルメタン、4,4’-(又は3,4’-、3,3’-、2,4’-)ジアミノ-ジフェニルエーテル、4,4’-ベンゾフェノンジアミン、3,3’-ベンゾフェノンジアミン、4,4’-ビス(4-アミノ-7フェノキシ)ビフェニル、1,4-ビス(4-アミノ-フェノキシ)ベンゼン、1,3-ビス(4-アミノ-フェノキシ)ベンゼン、2,2-ビス[4-(4-アミノ-フェノキシ)フェニル]プロパン、3,3-ジメチル-4,4’-ジアミノ-ジフェニルメタン、3,3’,5,5’-テトラメチル-4,4’-ジアミノ-ジフェニルメタン、2,2’-ビス(4-アミノ-フェニル)プロパン、5,5’-メチレン-ビス-(アントラニル酸)、3,5-ジアミノ-安息香酸、3,3’-ジヒドロキシ-4,4’-ジアミノ-ビフェニル等の芳香族ジアミン
一般式(1)で表される化学構造を有する化合物は、2官能シリコーン化合物に由来する化合物である。この化合物の例としては、ジメチルシロキサンに代表されるシリコーンオイルやその変性物、あるいはジメチルシロキサンに親水性基が結合したシリコーン系界面活性剤が挙げられる。この化合物は、一般式(1)の構造をその分子中に有していればよく、側鎖又は末端に前記の親水性基が結合していてもよい。
一般式(2)で表される化学構造を有する化合物は、フッ素化炭化水素に由来する化合物である。この化合物として代表的なものはフッ素系界面活性剤で、具体的にはパーフルオロアルキルカルボン酸塩、パーフルオロアルキルリン酸エステル、パーフルオロアルキルスルホン酸塩等のアニオン性フッ素系界面活性剤や、パーフルオロアルキルエチレンオキサイド付加物、パーフルオロアルキルアミンオキサイド、パーフルオロアルキルポリオキシエチレンエタノール、パーフルオロアルキルアルコキシレート、フッ素化アルキルエステル等の非イオン性フッ素系界面活性剤等を挙げることができる。一般式(2)で表される化合物としては、フッ素化炭化水素に由来する構造を有していればよいので、上記のフッ素系界面活性剤そのものを用いてもよいし、フッ素系界面活性剤の親水性基を除去したものを用いてもよい。
一般式(3)で表される化学構造、水酸基、カルボキシル基及びスルホ基からなる群のうち1種以上を有する化合物は、界面活性剤に由来する化合物である。この化合物として代表的なものはシリコーン系、フッ素系界面活性剤で、この化合物の例としては、ジメチルシロキサンに親水性基が結合したシリコーン系界面活性剤、パーフルオロアルキルカルボン酸塩、パーフルオロアルキルリン酸エステル、パーフルオロアルキルスルホン酸塩等のアニオン性フッ素系界面活性剤や、パーフルオロアルキルエチレンオキサイド付加物、パーフルオロアルキルアミンオキサイド、パーフルオロアルキルポリオキシエチレンエタノール、パーフルオロアルキルアルコキシレート、フッ素化アルキルエステル等の非イオン性フッ素系界面活性剤等を挙げることができる。一般式(3)で表される化合物としては、界面活性剤の親水性基を有していればよいので、上記のシリコーン系、フッ素系界面活性剤そのものを用いてもよいし、これらの界面活性剤から疎水性基を除去したものを用いてもよい。
一般式(4)で表される化学構造を有する化合物は、3官能シリコーン化合物に由来する化合物である。この化合物の例としては、3官能アルコキシシランの加水分解縮合物が挙げられる。この化合物を得るのに用いる3官能アルコキシシランとしては、アミノプロピルトリメトキシシラン、アミノプロピルトリエトキシシラン、N-2-(アミノエチル)-3-アミノプロピルトリメトキシシラン、N-2-(アミノエチル)-3-アミノプロピルトリエトキシシラン、3-アミノプロピルトリメトキシシラン、3-アミノプロピルトリエトキシシラン、N-フェニル-3-アミノプロピルトリメトキシシラン、N-フェニル-3-アミノプロピルトリエトキシシランなどが挙げられる。この化合物をフレキシブルデバイス用基板に含有させるには、前述の一般式(1)で表される化合物と同様、前記のポリイミド前駆体とともにこの化合物を溶媒に溶解し、加熱によって溶媒を除去するのが簡便である。
本実施の形態のフレキシブルデバイスの種類は特に限定されないが、代表的なものは有機ELフレキシブルディスプレイである。以下低温ポリシリコン、酸化物半導体TFT駆動型の有機ELフレキシブルディスプレイの製造に使用した場合について説明する。
(ポリアミック酸ワニスP-1の合成)
500ml三口セパラブルフラスコに窒素導入管を取り付けた。窒素下、オイルバス30℃で、N-メチル-2-ピロリドン(NMP)270.0g、3,3’,4,4’-ビフェニルテトラカルボン酸二無水物(BPDA)21.94gを入れ、均一に分散するまで攪拌した。さらに、p-フェニレンジアミン(PPD)8.06gを少しずつ添加した後、オイルバス80℃で4時間加熱して、ポリアミック酸ワニスP-1を得た。重量平均分子量は27万であった。
(ポリアミック酸ワニスP-2の合成)
500ml三口セパラブルフラスコに窒素導入管を取り付けた。窒素下、オイルバス30℃で、N-メチル-2-ピロリドン(NMP)270.0g、4,4’-オキシジフタル酸二無水物(ODPA)22.14gを入れ、均一に分散するまで攪拌した。さらに、2,2’-ビス(トリフルオロメチル)ベンジジン(TFMB)22.86gを少しずつ添加した後、オイルバス80℃で4時間加熱して、ポリアミック酸ワニスP-2を得た。重量平均分子量は20万であった。
(ポリイミドワニスP-3の合成)
500ml三口セパラブルフラスコに窒素導入管、ディーンスターク装置を取り付けた。窒素下、オイルバス30℃で、N-メチル-2-ピロリドン(NMP)185.0g、トルエン100.0g、4,4’-オキシジフタル酸二無水物(ODPA)7.38gを入れ、均一に分散するまで攪拌した。さらに、2,2’-ビス(トリフルオロメチル)ベンジジン(TFMB)7.62gを少しずつ添加した後、オイルバス120℃で4時間加熱した。その後、N-メチル-2-ピロリドン(NMP)100.0gを入れ、オイルバス120℃で加熱することでトルエンを除去し、ポリイミドワニスP-3を得た。重量平均分子量は15万であった。
(ポリアミック酸ワニスP-4の合成)
500ml三口セパラブルフラスコに窒素導入管を取り付けた。窒素下、オイルバス30℃で、N-メチル-2-ピロリドン(NMP)255.0g、4,4’-オキシジフタル酸二無水物(ODPA)16.84gを入れ、均一に分散するまで攪拌した。さらに、2,2-ビス[4-(4-アミノフェノキシ)フェニル]ヘキサフルオロプロパン(HF-BAPP)28.16gを少しずつ添加した後、オイルバス80℃で4時間加熱して、ポリアミック酸ワニスP-4を得た。重量平均分子量は18万であった。
(ポリアミック酸ワニスP-5の合成)
500ml三口セパラブルフラスコに窒素導入管を取り付けた。窒素下、オイルバス30℃で、N-メチル-2-ピロリドン(NMP)255.0g、2,2-ビス(3,4-アンヒドロジカルボキシフェニル)-ヘキサフルオロプロパン(6FDA)26.15gを入れ、均一に分散するまで攪拌した。さらに、2,2’-ビス(トリフルオロメチル)ベンジジン(TFMB)18.85gを少しずつ添加した後、オイルバス80℃で4時間加熱して、ポリアミック酸ワニスP-5を得た。重量平均分子量は17万であった。
(ポリアミック酸ワニスP-6の合成)
500ml三口セパラブルフラスコに窒素導入管を取り付けた。窒素下、オイルバス30℃で、N-メチル-2-ピロリドン(NMP)255.0g、シクロヘキサンテトラカルボン酸二無水物(PMDA-HH)18.53gを入れ、均一に分散するまで攪拌した。さらに、2,2’-ビス(トリフルオロメチル)ベンジジン(TFMB)31.42gを少しずつ添加した後、オイルバス80℃で4時間加熱して、ポリアミック酸ワニスP-6を得た。重量平均分子量は19万であった。
(ポリアミック酸及びポリイミド組成物の調製)
表1及び表2に示すように各種成分を調製、混合した。これを孔径2.5ミクロンのPTFE製フィルターで加圧ろ過して、実施例1~26及び比較例1~4のワニス状組成物を得た。
A-1 DBE-712(アヅマックス社製)
A-2 DBE-821(アヅマックス社製)
A-3 ポリフローKL-100(共栄社化学社製)
A-4 ポリフローKL-401(共栄社化学社製)
A-5 ポリフローKL-402(共栄社化学社製)
A-6 ポリフローKL700(共栄社化学社製)
A-7 LE-604(共栄社化学社製)
A-8 LE-605(共栄社化学社製)
A-9 LINC-151-EPA(共栄社化学社製)
S-1 3-(トリエトキシシリルプロピル)無水コハク酸(GELEST社製)
S-2 3-グリシドキシプロピルトリメトキシシラン(GELEST社製)
S-3 3-アミノプロピルトリエトキシシラン(GELEST社製)
S-4 3-アミノプロピルトリエトキシシランと無水フタル酸との1:1反応物
S-5 3-アミノプロピルトリメトキシシランと無水フタル酸との1:1反応物
S-6 (3-トリエトキシシリルプロピル)-t-ブチルカルバメート(GELEST社製)
S-7 3-アミノプロピルトリエトキシシランとフェニルイソシアネートとの1:1反応物
S-8 3,3’,4,4’-ベンゾフェノンテトラカルボン酸二無水物と3-アミノプロピルトリエトキシシランの1:2反応物
S-9 メチルトリメトキシシラン(GELEST社製)
実施例1~26及び比較例1~4で得られたワニス状組成物を、表面をアルカリ洗浄法及びプラズマ洗浄法により洗浄した、10cm角の無アルカリガラス基板上にバーコーターを用いてキュア後の膜厚が20μmとなるように塗工した。これらの塗膜を以下のキュア条件のいずれかによりキュアし、無アルカリガラス基板上に20μm厚のポリイミド樹脂層を形成した。実施例1~26及び比較例1~4について適用したキュア条件を表3、表4に示した。
ワニス状組成物のキュア条件(すべて窒素雰囲気下で実施)
A: 140℃×1hr+250℃×1hr+350℃×1hr
B: 140℃×1hr+450℃×1hr
C: 140℃×1hr+500℃×1hr
実施例1~26及び比較例1~4で得られたワニス状組成物より作られたポリイミド樹脂層について、以下の項目について評価し、結果を表3、表4に示した。
実施例1~26及び比較例1~4で得られたワニス状組成物の、無アルカリガラス基板上に形成した、キュア後20μm厚のポリイミド樹脂層において、無アルカリガラス基板とポリイミド樹脂層の密着性について、目視にて塗膜の状態を以下の基準で確認した。
◎ : キュア後、ガラス基板上に均一な膜が形成できている。
× : キュア後、ガラス基板上にポリイミド樹脂層が部分的に浮いている、又は剥がれている箇所が1箇所以上ある。
実施例1~26及び比較例1~4で得られたワニス状組成物の、無アルカリガラス基板上に形成した、キュア後20μm厚のポリイミド樹脂層上に、真空蒸着装置にて、厚みが50nmとなるように二酸化珪素膜を蒸着した。このサンプルを350℃×4hr、窒素雰囲気下で加熱した後の無アルカリガラス基板とポリイミド樹脂層の密着性について、目視にて塗膜の状態を以下の基準で確認した。
◎ : キュア後、ガラス基板上に均一なポリイミド樹脂層が形成できている。
× : キュア後、ガラス基板上にポリイミド樹脂層が部分的に浮いている、又は剥がれている箇所が1箇所以上ある。
実施例1~26及び比較例1~4で得られたワニス状組成物の、ガラス基板上に塗膜した、キュア後20μm厚のポリイミド樹脂層を、分光光度計UV-1600PC(島津社製)を用い、800nm~300nmの光透過率を測定し、550nmの光透過率を確認した。この際、リファレンス部には、塗膜のない無アルカリガラス基板を置いた。
実施例1~26及び比較例1~4で得られたワニス状組成物の、ガラス基板上に塗膜した、キュア後20μm厚のポリイミド樹脂層を、長さ10mm、幅10mmに切り出し、幅10mmの中央部の幅1.0mmをテープにてマスキングした。その後、温度23±2℃、湿度50±5%RHの環境下24時間以上調湿し、同環境下で、テープにてマスキングした幅1.0mmのポリイミド樹脂層をガラス基板から剥離角度180°、剥離速度を50mm/分としてその応力を測定した。
実施例1~26及び比較例1~4で得られたワニス状組成物の、20cm角ガラス基板上に形成した、キュア後(キュア条件:A、B、C)20μm厚みのポリイミド樹脂層において、ポリイミド樹脂層の4辺の端から2cm部分にカッターナイフにて切り込みを入れ、1辺が16cmの四角形の切り込みを有するポリイミド樹脂層のサンプルを作製した。このサンプルの端部にポリイミドテープをつけ、ポリイミドテープを引き上げることで、ガラス基板からサンプルを剥離した。その際、以下の基準で剥離のしやすさを判断した。
◎ : ガラス基板に密着したポリイミド樹脂層が容易に剥離できる。
○ : ガラス基板に密着したポリイミド樹脂層が密着しており、剥離の際、ひっかかりがあるものの、ポリイミド樹脂層が破れず剥離できる。
× : ガラス基板にポリイミド樹脂層が密着していない、又はポリイミド樹脂層が密着して剥がれず、膜が破れてしまう。
(A)ポリアミック酸として合成例1で示したP-1、(B)シリコーン化合物としてDBE-712(アヅマックス社製)、(C)アルコキシシラン化合物として3-アミノプロピルトリエトキシシランと無水フタル酸との1:1反応物、(D)溶媒としてN-メチル-2-ピロリドン(NMP)を、10.0:0.05:0.05:89.90の質量比で調合、混合した。これを孔径2.5ミクロンのPTFE製フィルターで加圧ろ過して、ワニス状組成物を得た。
(A)ポリアミック酸として合成例1で示したP-1、(B)フッ素化合物としてLE-605(共栄社化学社製)、(C)アルコキシシラン化合物として3-アミノプロピルトリエトキシシランと無水フタル酸との1:1反応物、(D)溶媒としてN-メチル-2-ピロリドン(NMP)を、10.0:0.09:0.01:89.90の質量比で調合、混合した。これを孔径2.5ミクロンのPTFE製フィルターで加圧ろ過して、ワニス状組成物を得た。
(A)ポリアミック酸として合成例1で示したP-1、(B)シリコーン化合物としてDBE-712(アヅマックス社製)、(D)溶媒としてN-メチル-2-ピロリドン(NMP)を、10.0:0.05:89.95の質量比で調合、混合した。これを孔径2.5ミクロンのPTFE製フィルターで加圧ろ過して、ワニス状組成物を得た。
(A)ポリアミック酸として合成例1で示したP-1、(B)フッ素化合物としてLE-605(共栄社化学社製)、(D)溶媒としてN-メチル-2-ピロリドン(NMP)を、10.0:0.09:89.91の比で調合、混合した。これを孔径2.5ミクロンのPTFE製フィルターで加圧ろ過して、ワニス状組成物を得た。
(A)ポリアミック酸として合成例1で示したP-1、(C)アルコキシシラン化合物として3-アミノプロピルトリエトキシシランと無水フタル酸との1:1反応物、(D)溶媒としてN-メチル-2-ピロリドン(NMP)を、10.0:0.05:89.95の質量比で調合、混合した。これを孔径2.5ミクロンのPTFE製フィルターで加圧ろ過して、ワニス状組成物を得た。
実施例27、28及び比較例5~7にて、無アルカリガラス基板上に塗工・キュアされた組成物からなるフレキシブルデバイス用基板の構造解析をTOF-SIMSを用いて実施した。TOF-SIMSの測定条件を下記に示す。
各試料を5mm四方にカットして、測定面が上になるようにセットし、TOF-SIMS測定に供した。まず、表面の汚染を除去するために、下記条件でスパッタクリーニングを行った。スパッタ時間は、Si強度が一定になるまでとした。
(測定条件)
使用機器 :nanoTOF(アルバック・ファイ社製)
一次イオン :Bi3 ++
加速電圧 :30kV
イオン電流 :約0.47nA(DCとして)
分析面積 :200μm×200μm
分析時間 :6sec
検出イオン :正イオン
中和 :電子銃使用(必要に応じて+Arモノマー使用)
スパッタイオン :Ar2500 +
加速電圧 :20kV
イオン電流 :約5nA
スパッタ面積 :600μm×600μm
スパッタ時間 :30sec
中和 :電子銃使用
<分析条件>
(測定条件)
使用機器 :nanoTOF(アルバック・ファイ社製)
一次イオン :Bi3 ++
加速電圧 :30kV
イオン電流 :約0.47nA(DCとして)
分析面積 :200μm×200μm
分析時間 :15min
検出イオン :正イオン
中和 :電子銃使用(必要に応じて+Arモノマー使用)
○:(C)アルコキシシラン化合物に特徴的なピークを有する。
×:(C)アルコキシシラン化合物に特徴的なピークを有さない。
得られた解析結果を、以下の基準で判断した。結果を表5に示す。
○:(B)界面活性剤に特徴的なピークを有する。
×:(B)界面活性剤に特徴的なピークを有さない。
実施例27、28及び比較例5~6で得られたフレキシブルデバイス用基板(可撓性を有するフィルム状である)の膜厚を光学式膜厚計で測定し、以下の基準で判断した。結果を表5に示す。
○:幅10cmの範囲で、膜厚ばらつきが50nm以下
×:幅10cmの範囲で、膜厚ばらつきが50nmより大きい
-:測定不能
実施例27で得られた積層体をフレキシブルデバイス製造用の基板として、積層体上に第1バリア層を形成した。さらに第1バリア層上に、半導体層、ゲート絶縁膜、ゲート電極、層間絶縁膜、コンタクトホール、ソース・ドレイン電極を順次形成し、薄膜トランジスタ(TFT)を形成した。その後、無アルカリガラス基板からTFTデバイスが剥離し、フレキシブルTFTデバイスを得た。得られたフレキシブルTFTデバイスの電流-電圧特性を評価し、良好な面内均一性を示すことを確認した。
実施例28で得られた積層体をフレキシブルデバイス製造用の基板として、積層体上に第1バリア層を形成した。さらに第1バリア層上に、半導体層、ゲート絶縁膜、ゲート電極、層間絶縁膜、コンタクトホール、ソース・ドレイン電極を順次形成し、薄膜トランジスタ(TFT)を形成した。その後、無アルカリガラス基板からTFTデバイスを剥離し、フレキシブルTFTデバイスを得た。得られたフレキシブルTFTデバイスの電流-電圧特性を評価し、良好な面内均一性を示すことを確認した。
Claims (26)
- 請求項1記載のフレキシブルデバイス用基板上に半導体デバイスが形成されたことを特徴とするフレキシブルデバイス。
- 前記半導体デバイスが薄膜トランジスタであることを特徴とする請求項2記載のフレキシブルデバイス。
- 前記フレキシブルデバイスが、ポリシリコン半導体又は金属酸化物半導体駆動型フレキシブルディスプレイであることを特徴とする請求項2又は請求項3記載のフレキシブルデバイス。
- 無機基板と、前記無機基板の表面上に設けられ、(a)5%熱分解温度が350℃以上のポリイミドを含むポリイミド樹脂層と、を具備し、
前記ポリイミド樹脂層と前記無機基板との180°ピール強度が0.004~0.250N/cmであることを特徴とする積層体。 - 前記ポリイミド樹脂層が、
(b)シリコーン界面活性剤又はフッ素系界面活性剤、及び、
(c)アミド基、アミノ基、カルバメート基、カルボキシル基、アリール基、酸無水物基及び重合性環状エーテル基からなる群から選ばれる少なくとも1種の官能基を有するアルコキシシラン化合物
をさらに含むことを特徴とする請求項6記載の積層体。 - 前記無機基板が、ガラス基板であることを特徴とする請求項6又は請求項7記載の積層体。
- 請求項6から請求項8のいずれかに記載の積層体上に半導体デバイスを形成する工程と、その後に無機基板から剥離する工程と、を含むことを特徴とするフレキシブルデバイスの製造方法。
- 前記積層体を250℃以上に加熱する工程をさらに含むことを特徴とする請求項9記載のフレキシブルデバイスの製造方法。
- 前記半導体デバイスが、薄膜トランジスタであることを特徴とする請求項9又は請求項10記載のフレキシブルデバイスの製造方法。
- 前記フレキシブルデバイスが、ポリシリコン半導体又は金属酸化物半導体駆動型フレキシブルディスプレイであることを特徴とする請求項9から請求項11のいずれかに記載のフレキシブルデバイスの製造方法。
- (a)5%熱分解温度が350℃以上のポリイミド、又は、イミド化処理により5%熱分解温度が350℃以上のポリイミドとなるポリイミド前駆体と、
(b)シリコーン系界面活性剤又はフッ素系界面活性剤と、
(c)アミノ基、カルバメート基、カルボキシル基、アリール基、酸無水物基、アミド基及び重合性環状エーテル基からなる群から選ばれる少なくとも1種の官能基を有するアルコキシシラン化合物と、
を含むことを特徴とする樹脂組成物。 - 前記(b)成分が、非極性部位として分子内に2以上1000以下のSi-O結合を有し、極性部位として分子内に1以上100以下のポリエーテル基、水酸基、カルボキシル基又はスルホ基を有するシリコーン系界面活性剤であることを特徴とする請求項13記載の樹脂組成物。
- 前記(b)成分が、非極性部位として分子内に3以上100以下のC-F基結合を有し、極性部位として分子内に1以上100以下のポリエーテル基、水酸基、カルボキシル基又はスルホ基を有するフッ素系界面活性剤であることを特徴とする請求項13記載の樹脂組成物。
- 前記(b)成分を、前記(a)成分100質量部に対して、0.001質量部~10質量部含むことを特徴とする請求項13から請求項15のいずれかに記載の樹脂組成物。
- 前記(c)成分が、カルバメート基、カルボキシル基、アミド基及びアリール基からなる群から選ばれる少なくとも1種の官能基を有するアルコキシシラン化合物であることを特徴とする請求項13から請求項16のいずれかに記載の樹脂組成物。
- 前記(c)成分を、前記(a)成分100質量部に対して、0.001質量部~9質量部含むことを特徴とする請求項13から請求項17のいずれかに記載の樹脂組成物。
- (d)溶媒をさらに含むことを特徴とする請求項13から請求項18のいずれかに記載の樹脂組成物。
- 前記(d)成分が、非プロトン性極性溶媒であることを特徴とする請求項19記載の樹脂組成物。
- 請求項19又は請求項20記載の樹脂組成物を無機基板上に展開する工程と、
前記樹脂組成物からなるポリイミド樹脂層を形成し、前記無機基板及び前記ポリイミド樹脂層を具備する積層体を得る工程と、
を具備することを特徴とする積層体の製造方法。 - 前記無機基板が、ガラス基板であることを特徴とする請求項21記載の積層体の製造方法。
- 請求項21又は請求項22記載の積層体の製造方法で得られた前記積層体上に半導体デバイスを形成する工程と、その後に前記無機基板から剥離する工程と、を含むことを特徴とするフレキシブルデバイスの製造方法。
- 前記積層体を250℃以上に加熱する工程をさらに含むことを特徴とする請求項23記載のフレキシブルデバイスの製造方法。
- 前記半導体デバイスが、薄膜トランジスタであることを特徴とする請求項23又は請求項24記載のフレキシブルデバイスの製造方法。
- 前記フレキシブルデバイスが、ポリシリコン半導体又は金属酸化物半導体駆動型フレキシブルディスプレイであることを特徴とする請求項23から請求項25のいずれかに記載のフレキシブルデバイスの製造方法。
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| Publication number | Publication date |
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| JP6259028B2 (ja) | 2018-01-10 |
| CN104769021A (zh) | 2015-07-08 |
| JPWO2014073591A1 (ja) | 2016-09-08 |
| TW201542691A (zh) | 2015-11-16 |
| JP2016225638A (ja) | 2016-12-28 |
| TW201431955A (zh) | 2014-08-16 |
| JP6067740B2 (ja) | 2017-01-25 |
| KR101709422B1 (ko) | 2017-02-22 |
| TWI529215B (zh) | 2016-04-11 |
| TWI555797B (zh) | 2016-11-01 |
| CN104769021B (zh) | 2017-10-10 |
| KR20150068442A (ko) | 2015-06-19 |
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