WO2016024457A1 - アルコキシシラン変性ポリアミド酸溶液、それを用いた積層体及びフレキシブルデバイス、並びに積層体の製造方法 - Google Patents
アルコキシシラン変性ポリアミド酸溶液、それを用いた積層体及びフレキシブルデバイス、並びに積層体の製造方法 Download PDFInfo
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- 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
- C08G73/1003—Preparatory processes
- C08G73/1007—Preparatory processes from tetracarboxylic acids or derivatives and diamines
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- 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
- B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
- B32B27/281—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polyimides
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
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- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1003—Preparatory processes
- C08G73/1007—Preparatory processes from tetracarboxylic acids or derivatives and diamines
- C08G73/101—Preparatory processes from tetracarboxylic acids or derivatives and diamines containing chain terminating or branching agents
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- 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
- C08G73/1003—Preparatory processes
- C08G73/1007—Preparatory processes from tetracarboxylic acids or derivatives and diamines
- C08G73/1028—Preparatory processes from tetracarboxylic acids or derivatives and diamines characterised by the process itself, e.g. steps, continuous
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- 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
- C08G73/1003—Preparatory processes
- C08G73/1007—Preparatory processes from tetracarboxylic acids or derivatives and diamines
- C08G73/1028—Preparatory processes from tetracarboxylic acids or derivatives and diamines characterised by the process itself, e.g. steps, continuous
- C08G73/1032—Preparatory processes from tetracarboxylic acids or derivatives and diamines characterised by the process itself, e.g. steps, continuous characterised by the solvent(s) used
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- 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
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- 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
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
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- H05K1/02—Details
- H05K1/03—Use of materials for the substrate
- H05K1/0313—Organic insulating material
- H05K1/032—Organic insulating material consisting of one material
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- H05K1/0313—Organic insulating material
- H05K1/032—Organic insulating material consisting of one material
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- H05K1/03—Use of materials for the substrate
- H05K1/0313—Organic insulating material
- H05K1/0353—Organic insulating material consisting of two or more materials, e.g. two or more polymers, polymer + filler, + reinforcement
- H05K1/036—Multilayers with layers of different types
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- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
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- H05K1/0393—Flexible materials
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- H05K3/007—Manufacture or processing of a substrate for a printed circuit board supported by a temporary or sacrificial carrier
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- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/46—Manufacturing multilayer circuits
- H05K3/4644—Manufacturing multilayer circuits by building the multilayer layer by layer, i.e. build-up multilayer circuits
- H05K3/4673—Application methods or materials of intermediate insulating layers not specially adapted to any one of the previous methods of adding a circuit layer
- H05K3/4676—Single layer compositions
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
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- H05K2203/02—Details related to mechanical or acoustic processing, e.g. drilling, punching, cutting, using ultrasound
- H05K2203/0264—Peeling insulating layer, e.g. foil, or separating mask
Definitions
- the present invention relates to an alkoxysilane-modified polyamide acid solution, a laminate and a flexible device using the alkoxysilane-modified polyamide acid solution, and a method for producing the laminate.
- glass substrates are mainly used as substrates in the field of electronic devices such as flat panel displays and electronic paper.
- a glass substrate is not necessarily an ideal substrate because it is heavy and fragile. Therefore, studies have been actively conducted to realize a flexible device in which the substrate is replaced with a substrate made of a polymer material from a glass substrate.
- many of the techniques for producing these flexible devices require new production techniques and equipment. Therefore, flexible devices using polymer materials have not been mass-produced.
- Non-Patent Document 1 In the process using this laminate, the polyimide resin layer is separated from the glass substrate at the final stage to obtain a flexible device.
- the laminate is required to have smoothness and low warpage for good handling. That is, the polyimide resin layer of the laminate needs to have a linear expansion coefficient comparable to that of glass.
- soda lime glass and non-alkali glass are used as the material of the glass substrate.
- the linear expansion coefficient of soda lime glass is about 8 to 9 ppm / ° C.
- the linear expansion coefficient of alkali-free glass is about 3 to 5 ppm / ° C.
- the process temperature at the time of manufacturing an amorphous silicon thin film transistor reaches 300 to 350 ° C. at the maximum. Since the coefficient of linear expansion of general polyimide is larger than that of glass, materials suitable for such a process are naturally limited.
- Patent Document 1 discloses a polyimide precursor obtained from 3,3 ′, 4,4′-biphenyltetracarboxylic dianhydride and paraphenylenediamine or 4,4 ′′ diaminoparaterphenyl on an inorganic substrate.
- a polyimide precursor having a specific structure is formed into a film on an inorganic substrate and further heated at a certain rate.
- the polyimide film may be peeled off from the substrate when heat imidization is carried out by using a surface treatment of the inorganic substrate for the purpose of improving the adhesion between the polyimide and the inorganic substrate (Non-patent Document 2), polyimide A silane coupling agent having an amino group or an acid anhydride group is added to the precursor solution (Patent Documents 2 and 3).
- Japanese Patent Publication Japanese Patent Laid-Open No. 2012-35583 (Released on February 23, 2012)” Japanese Published Patent Publication "Japanese Patent Laid-Open No. 63-302069 (published on December 8, 1988)” Japanese Patent Gazette “Patent No. 2551214 (Registered on August 22, 1996)”
- Patent Document 1 When a polyimide precursor having a specific structure exhibiting a low linear expansion coefficient as shown in Patent Document 1 is formed into a polyimide film on an inorganic substrate, it is heated and imidized by a temperature increase at a certain rate or more. There was a problem that the polyimide film peeled off. In general, the thicker the film before imidization, the easier it is to peel off. Therefore, when producing a laminate of a thick polyimide film and a glass substrate, it is difficult to increase productivity. Moreover, when using a polyamic acid as a polyimide precursor, since the viscosity change at the time of storing at normal temperature is large, it was necessary to store it refrigerated.
- the present invention has been made in view of the above background, and can be suitably used for the production of a polyamic acid solution that can be formed without peeling even with a thick film and can be stably stored at room temperature, and a flexible device. It is an object of the present invention to provide a laminate of a polyimide film and an inorganic substrate, specifically a laminate of a polyimide film and an inorganic substrate having a linear expansion coefficient of 1 to 10 ppm / ° C.
- the alkoxysilane-modified polyamic acid solution according to the present invention is an alkoxysilane-modified polyamic acid solution obtained by reacting an aminosilane-containing alkoxysilane compound and a polyamic acid in the solution, and the polyamic acid is an aromatic diamine.
- aromatic tetracarboxylic dianhydride in a solvent, and the molar ratio obtained by dividing the total number of moles of aromatic tetracarboxylic dianhydride by the total number of moles of aromatic diamine is 0.
- the addition amount of the alkoxysilane compound exceeds 0.050 part by weight when the amount of the polyamic acid contained in the alkoxysilane-modified polyamic acid solution is 100 parts by weight. And less than 0.100 parts by weight.
- the water content of the alkoxysilane-modified polyamic acid solution may be 500 ppm or more and 3000 ppm or less.
- the aromatic tetracarboxylic dianhydride is 3,3 ′, 4,4′-biphenyltetracarboxylic dianhydride
- the aromatic diamine is represented by the following formula ( The aromatic diamine represented by 1) may be used.
- the main component of the solvent may be an amide solvent.
- the method for producing a laminate according to the present invention includes a polyimide film obtained from the alkoxysilane-modified polyamic acid solution by casting the alkoxysilane-modified polyamic acid solution according to the present invention on an inorganic substrate and thermal imidization. Includes a step of obtaining a laminate laminated on the inorganic substrate.
- the method for manufacturing a flexible device according to the present invention includes a step of forming an electronic element on a polyimide film in the laminate obtained by the method for manufacturing a laminate according to the present invention, and a polyimide film on which the electronic element is formed. And a step of peeling from the inorganic substrate.
- a laminate according to the present invention is a laminate having a polyimide film obtained from the alkoxysilane-modified polyamic acid solution according to the present invention and an inorganic substrate on which the polyimide film is laminated, and the linear expansion coefficient of the polyimide film Is 1 to 10 ppm / ° C.
- the inorganic substrate may have a thickness of 0.4 to 5.0 mm, and the polyimide film may have a thickness of 10 to 50 ⁇ m.
- the flexible device according to the present invention is characterized by having a polyimide film obtained from the alkoxysilane-modified polyamic acid solution according to the present invention and an electronic element formed on the polyimide film.
- the method for producing an alkoxysilane-modified polyamic acid solution comprises a step of obtaining a polyamic acid by reacting an aromatic diamine and an aromatic tetracarboxylic dianhydride in a solvent, and an alkoxysilane containing an amino group. And a step of reacting the compound with the polyamic acid in a solution to obtain an alkoxysilane-modified polyamic acid solution, and the total number of moles of the aromatic tetracarboxylic dianhydride is calculated based on the total number of aromatic diamines.
- the molar ratio divided by the number of moles is 0.980 or more and 0.9995 or less, and the addition amount of the alkoxysilane compound is 100 parts by weight of the polyamic acid contained in the alkoxysilane-modified polyamic acid solution. In some cases, it is more than 0.050 part by weight and less than 0.100 part by weight.
- an alkoxysilane-modified polyamic acid solution prepared so that most of the terminal ends of the polyamic acid are amino groups is likely to generate an amide bond when decomposition occurs. For this reason, the molecular weight of the alkoxysilane-modified polyamic acid solution is less likely to change, and the viscosity change during varnish storage can be suppressed.
- the alkoxysilane-modified polyamic acid solution (hereinafter also simply referred to as “solution”) of the present invention can be obtained by reacting an alkoxysilane compound containing an amino group and polyamic acid in a solution.
- Polyamic acid can be obtained by reacting aromatic diamine and aromatic tetracarboxylic dianhydride in a solvent.
- the modification with the aminosilane-containing alkoxysilane compound is performed by adding the aminosilane-containing alkoxysilane compound to the polyamic acid solution in which the polyamic acid is dissolved in a solvent, and reacting the aminosilane-containing alkoxysilane compound with the polyamic acid. Is done.
- alkoxysilane compound containing an amino group examples include 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-aminopropylmethyldimethoxysilane, 3-aminopropylmethyldiethoxysilane, 3- (2-amino And ethyl) aminopropyltrimethoxysilane, 3-phenylaminopropyltrimethoxysilane, 2-aminophenyltrimethoxysilane, and 3-aminophenyltrimethoxysilane.
- the alkoxysilane compound containing a primary amino group is preferable.
- the alkoxysilane compound containing an amino group is an alkoxysilane compound containing a primary amino group, it can react suitably with polyamic acid.
- the mixing ratio of these alkoxysilane compounds containing amino groups to 100 parts by weight of polyamic acid is more than 0.050 parts by weight and less than 0.100 parts by weight.
- the compounding ratio of the alkoxysilane compound containing an amino group to 100 parts by weight of the polyamic acid is more than 0.050 parts by weight and not more than 0.099 parts by weight, 0.050. More preferably, it is more than 0.095 parts by weight and more than 0.050 parts by weight and less than 0.090 parts by weight.
- the lower limit of the mixing ratio of the alkoxysilane compound containing an amino group to 100 parts by weight of the polyamic acid may be 0.051 part by weight or more, 0.055 part by weight or more, and It may be 060 parts by weight or more.
- the compounding ratio of the alkoxysilane compound containing an amino group exceeds 0.050 part by weight, the effect of suppressing the peeling of the polyimide film from the inorganic substrate is sufficiently exhibited.
- the blending ratio of the alkoxysilane compound containing an amino group is less than 0.100 parts by weight, the molecular weight of the polyamic acid is sufficiently maintained, and problems such as embrittlement of the polyimide film do not occur. Furthermore, when it is less than 0.100 parts by weight, the change in viscosity after addition of the alkoxysilane compound is also reduced.
- the unreacted components gradually react with the polyamic acid to reduce the viscosity of the polyamic acid solution, or the polycondensation between alkoxysilanes causes the polyamic acid solution to gel.
- the amount of aminosilane-containing alkoxysilane compound By suppressing the amount of aminosilane-containing alkoxysilane compound to the minimum necessary, while preventing the polyimide film from peeling from the inorganic substrate, it suppresses extra side reactions such as viscosity reduction and gelation during varnish storage. can do.
- the reaction temperature is preferably 0 ° C. or higher and 80 ° C. or lower, more preferably 20 ° C. or higher and 60 ° C. or lower, since the modification reaction easily proceeds while suppressing the reaction between the acid anhydride group and water. preferable.
- the modification reaction is slow because the acid dianhydride concentration is small, and if the reaction temperature is low, it may take about 5 days for the viscosity to become constant.
- the viscosity change with time is recorded for each reaction temperature, and an appropriate reaction temperature may be selected.
- aromatic tetracarboxylic dianhydride mainly 3,3 ′, 4,4′-biphenyltetra Carboxylic dianhydride (hereinafter sometimes abbreviated as BPDA) is preferably used
- aromatic diamine an aromatic diamine represented mainly by the following formula (1) is preferably used.
- the aromatic diamine of the formula (1) is paraphenylenediamine (hereinafter sometimes abbreviated as PDA), 4,4′-diaminobenzidine, and 4,4 ′′ -diaminoparaterphenyl (hereinafter abbreviated as DATP).
- PDA paraphenylenediamine
- DATP 4,4 ′′ -diaminoparaterphenyl
- PDA and DATP are preferable because of their availability.
- the aromatic tetracarboxylic dianhydride is preferably 3,3 ', 4,4'-biphenyltetracarboxylic dianhydride.
- aromatic diamines other than PDA, 4,4′-diaminobenzidine, and DATP may be used as long as the characteristics of the present invention are not impaired, or 3,3 ′, 4,4′-biphenyltetracarboxylic acid.
- Aromatic tetracarboxylic dianhydrides other than dianhydrides may be used.
- the following aromatic tetracarboxylic dianhydrides and / or aromatic diamines may be used in an amount of 5 mol% or less based on the total amount of the polyamic acid raw material.
- Aromatic tetracarboxylic dianhydrides include pyromellitic dianhydride, 3,3 ′, 4,4′-benzophenone tetracarboxylic dianhydride, 2,3,3 ′, 4′-biphenyltetracarboxylic acid Dianhydride, 3,3 ′, 4,4′-diphenylsulfonetetracarboxylic dianhydride, 1,4,5,8-naphthalenetetracarboxylic dianhydride, 2,3,6,7-naphthalenetetracarboxylic Acid dianhydride, 1,2,5,6-naphthalenetetracarboxylic dianhydride, 4,4′-oxydiphthalic anhydride, 9,9-bis (3,4-dicarboxyphenyl) fluorene dianhydride, 9,9′-bis [4- (3,4-dicarboxyphenoxy) phenyl] fluorene dianhydride, 3,3 ′, 4,4′-bi
- Aromatic diamines include 4,4′-diaminodiphenyl ether, 3,4′-diaminodiphenyl ether, 4,4′-diaminodiphenyl sulfone, 1,5- (4-aminophenoxy) pentane, 1,3-bis (4 -Aminophenoxy) -2,2-dimethylpropane, 2,2-bis (4-aminophenoxyphenyl) propane, bis [4- (4-aminophenoxy) phenyl] sulfone and bis [4- (3-aminophenoxy) Phenyl] sulfone and the like.
- the polyamic acid used in the present invention can be produced by solution polymerization. That is, one or more aromatic tetracarboxylic dianhydrides as raw materials and one or more aromatic diamines are used so that the molar ratio of the aromatic diamine is higher than that of the carboxyl group. Then, it is polymerized in an organic polar solvent to obtain a polyamic acid solution which is a polyimide precursor.
- the molar ratio obtained by dividing the total number of moles of aromatic tetracarboxylic dianhydride by the total number of moles of aromatic diamine is preferably 0.980 or more and 0.9995 or less, more preferably 0.995 or more and 0.0. 998 or less.
- the molar ratio is preferably 0.980 or more and 0.9995 or less, more preferably 0.995 or more and 0.0. 998 or less.
- the molar ratio is 0.980 or more, a strong polyimide film having excellent tensile strength can be obtained.
- the molar ratio should preferably be 0.998 or more to prepare for molecular weight reduction during storage or imidization.
- the tensile strength is evaluated by a tensile property test method described in JIS K7127: 1999.
- Preferred solvents for synthesizing the polyamic acid are amide solvents, that is, N, N-dimethylformamide, N, N-dimethylacetamide, N-methyl-2-pyrrolidone and the like.
- the main component of the solvent is preferably an amide solvent.
- the amount of the amide solvent is preferably 50 to 100 parts by weight, and more preferably 70 to 100 parts by weight.
- N, N-dimethylacetamide when used as the solvent, the storage stability of the polyamic acid is deteriorated and the linear expansion coefficient of the polyimide film is increased.
- N-methyl-2-pyrrolidone when used as the solvent, the storage stability of the polyamic acid solution is high, and the linear expansion coefficient of the polyimide film is lower.
- better characteristics can be obtained using N-methyl-2-pyrrolidone, but either one is not superior with respect to characteristics such as linear expansion coefficient.
- N-methyl-2-pyrrolidone is used if the polyimide film is preferably harder, and N, N-dimethylacetamide is used if the polyimide film is softer.
- a suitable solvent should be selected.
- the reaction apparatus is preferably provided with a temperature adjusting device for controlling the reaction temperature.
- the reaction temperature for polymerizing the polyamic acid is preferably 0 ° C. or higher and 80 ° C. or lower, and 20 ° C. or higher and 60 ° C. or lower suppresses dissociation of the amide bond, which is a reverse reaction of the polymerization, and further polyamic acid. It is preferable because the viscosity of
- heat treatment may be performed at about 70 to 90 ° C. for 1 to 24 hours for the purpose of adjusting the viscosity, that is, adjusting the molecular weight.
- This is an operation conventionally referred to as cooking, and heat treatment promotes dissociation of amic acid and deactivation of acid dianhydride due to reaction with water in the system.
- the purpose is to make the viscosity suitable for the operation. Since the unreacted aromatic tetracarboxylic dianhydride tends to be deactivated, it is preferable to carry out the polymerization reaction and cooking separately. However, the reaction temperature is set to 70 to 90 ° C. from the beginning and the polymerization reaction and cooking are performed. It is also possible to carry out all at once.
- the polyamic acid dissolved in the organic solvent is preferably 5 to 30% by weight, more preferably 8 to 25% by weight, and 10 to 20%. More preferably, it is% by weight. If the weight% of the polyamic acid is in the above range, it is preferable because gelation due to abnormal polymerization of the undissolved raw material can be suppressed and the viscosity of the polyamic acid is likely to increase.
- the water content in all the alkoxysilane-modified polyamic acid solutions so far is preferably 500 ppm to 3000 ppm, more preferably 500 ppm to 1000 ppm. It is preferable that the water content is 3000 ppm or less because the effect of improving storage stability by adjusting the molar ratio is sufficiently exhibited. In the case of 1000 ppm or less, it is more preferable because the viscosity change at the time of varnish storage can be suppressed by reducing the probability that the acid anhydride group generated by the decomposition of the amide bond in the polyamic acid molecule reacts with water to deactivate.
- the water in the solution can be divided into raw material origin and work environment origin. There are various methods for reducing moisture, but it is not preferable to reduce moisture more than necessary by using an extra process or excess equipment because the cost increases. For example, since the water content of a commercially available amide solvent is about 500 ppm, an attempt to reduce the water content below that is not preferable because the cost increases.
- the treatment may be performed under reduced pressure.
- the preferred value of the molar ratio obtained by dividing the total number of moles of aromatic tetracarboxylic dianhydride by the total number of moles of aromatic diamine can also vary depending on the relationship with the water content of the alkoxysilane-modified polyamic acid solution.
- the molar ratio is 0.00. It is preferably 9975 or less, and the water content is preferably 2500 ppm or less, more preferably the molar ratio is 0.9975 or less, and the water content is 2200 ppm or less. From the above viewpoint, the molar ratio is more preferably 0.9950 or less, and particularly preferably 0.9901 or less.
- a laminate having a polyimide film and an inorganic substrate can be produced by casting the above-described alkoxysilane-modified polyamic acid solution on an inorganic substrate and thermal imidizing. It can be said that the laminate is a laminate in which a polyimide film obtained from an alkoxysilane-modified polyamic acid solution is laminated on an inorganic substrate.
- the inorganic substrate examples include a glass substrate and various metal substrates, and a glass substrate is preferable.
- a glass substrate As a material for the glass substrate, soda lime glass, borosilicate glass, non-alkali glass, or the like is used. In particular, since alkali-free glass is generally used in the thin film transistor manufacturing process, alkali-free glass is more preferable as the material for the inorganic substrate.
- the thickness of the inorganic substrate used is preferably 0.4 to 5.0 mm. A thickness of the inorganic substrate of 0.4 mm or more is preferable because the inorganic substrate can be easily handled. Moreover, it is preferable if the inorganic substrate is 5.0 mm or less because the heat capacity of the inorganic substrate is reduced and the productivity in the heating or cooling process is improved.
- a known method can be used.
- known casting methods such as a gravure coating method, a spin coating method, a silk screen method, a dip coating method, a bar coating method, a knife coating method, a roll coating method, and a die coating method can be exemplified.
- the above-mentioned reaction solution may be used as it is, but the solvent may be removed or added as necessary.
- Solvents that can be used for the polyimide precursor solution include N, N-dimethylformamide, N, N-dimethylacetamide, and N-methyl-2-pyrrolidone, Examples include dimethyl sulfoxide, hexamethylphosphoric triamide (HMPA), acetonitrile, acetone, and tetrahydrofuran.
- auxiliary solvents xylene, toluene, benzene, diethylene glycol ethyl ether, diethylene glycol dimethyl ether, 1,2-bis- (2-methoxyethoxy) ethane, bis (2-methoxyethyl) ether, butyl cellosolve, butyl cellosolve acetate, propylene glycol methyl Ether and propylene glycol methyl ether acetate may be used in combination.
- An imidization catalyst and / or inorganic fine particles may be added to the polyimide precursor solution as necessary.
- a tertiary amine is preferably used.
- a heterocyclic tertiary amine is more preferable.
- the heterocyclic tertiary amine include pyridine, 2,5-diethylpyridine, picoline, quinoline and isoquinoline.
- the amount of the imidization catalyst used is preferably 0.01 to 2.00 equivalents, particularly 0.02 to 1.20 equivalents, based on the reaction site of the polyimide precursor (that is, alkoxysilane-modified polyamic acid).
- the amount is 2.00 equivalents or less, the ratio of the catalyst not involved in the reaction is small, which is preferable in terms of cost.
- the inorganic fine particles include inorganic oxide powders such as fine particle silicon dioxide (silica) powder and aluminum oxide powder, and inorganic salt powders such as fine particle calcium carbonate powder and calcium phosphate powder.
- inorganic oxide powders such as fine particle silicon dioxide (silica) powder and aluminum oxide powder
- inorganic salt powders such as fine particle calcium carbonate powder and calcium phosphate powder.
- these inorganic fine particles are preferably dispersed uniformly.
- Thermal imidation is a method in which the imidization reaction proceeds only by heating without the action of a dehydrating ring-closing agent or the like.
- the heating temperature and heating time at this time can be determined as appropriate, and may be as follows, for example.
- the heating atmosphere can be performed in air, under reduced pressure, or in an inert gas such as nitrogen.
- well-known apparatuses such as a hot air oven, an infrared oven, a vacuum oven, or a hot plate, can be used.
- heating is performed at a temperature of 200 to 500 ° C.
- the heating conditions at this time are preferably gradually increased from a low temperature.
- the maximum temperature is preferably in the range of 300 to 500 ° C.
- a maximum temperature of 300 ° C. or higher is preferable because thermal imidization easily proceeds and the mechanical properties of the obtained polyimide film are improved.
- a maximum temperature of 500 ° C. or lower is preferable because thermal degradation of polyimide does not proceed and characteristics do not deteriorate.
- the polyimide film is naturally peeled off from the inorganic substrate during the heat treatment.
- Cheap when an alkoxysilane-modified polyamic acid solution is used, natural peeling is suppressed, so that the process window can be greatly widened.
- the thickness of the polyimide film is preferably 5 to 50 ⁇ m. If the thickness of a polyimide film is 5 micrometers or more, the mechanical strength required as a board
- the thickness of the polyimide film is 5 ⁇ m or more, since sufficient mechanical strength necessary for the substrate film can be secured.
- the thickness of the polyimide film is 50 ⁇ m or less, the above-described natural peeling or the like is suppressed, and it becomes easy to stably obtain a laminate.
- the laminate obtained by the present invention is excellent in storage stability and process consistency, and can be suitably used for manufacturing a flexible device by a known thin film transistor process for liquid crystal panels.
- a polyimide film having a linear expansion coefficient of 1 to 10 ppm / ° C. by casting a solution of a polyimide precursor on an inorganic substrate, thermal imidization, and selecting a specific structure for the polyamic acid skeleton And a laminate having an inorganic substrate can be obtained. And the flexible device which has the outstanding characteristic can be obtained by using this laminated body.
- a flexible device having excellent characteristics can be obtained. That is, a flexible device can be obtained by forming an electronic element on the polyimide film of the laminate of the present invention and then peeling the polyimide film from the inorganic substrate. Further, the above process has an advantage that a production apparatus using an existing inorganic substrate can be used as it is, can be used effectively in the field of electronic devices such as flat panel displays and electronic paper, and is suitable for mass production.
- a method for peeling the polyimide film from the inorganic substrate a known method can be used. For example, it may be peeled off by hand, or may be peeled off using a mechanical device such as a drive roll or a robot. Furthermore, a method of providing a release layer between the inorganic substrate and the polyimide film may be used. In addition, for example, a method in which a silicon oxide film is formed on an inorganic substrate having a large number of grooves and the substrate is separated by infiltrating an etching solution, and a method in which an amorphous silicon layer is provided on the inorganic substrate and separated by laser light. I can list them.
- the polyimide film has excellent heat resistance and a low coefficient of linear expansion, and also has excellent characteristics such as not only excellent lightness and impact resistance but also improved warpage. is doing.
- a flexible device with improved warping can be obtained by adopting a method in which a polyimide film having a low linear expansion coefficient equivalent to that of an inorganic substrate is directly cast and laminated on the inorganic substrate.
- viscosity The viscosity was measured according to JIS K7117-2: 1999 using a viscometer RE-215 / U (manufactured by Toki Sangyo Co., Ltd.). The attached thermostat was set to 23.0 ° C., and the measurement temperature was always constant.
- Linear expansion coefficient The linear expansion coefficient was evaluated by thermomechanical analysis by a tensile load method using TMA / SS120CU manufactured by SII Nano Technology.
- the polyimide film of Example was peeled off from the glass substrate which is an inorganic substrate, and the sample of 10 mm x 3 mm was produced.
- a 3.0 g load was applied to the long side of the sample and heated to 500 ° C. or higher to remove residual stress, and then heated again at a rate of temperature increase of 10 ° C./min.
- the amount of change in strain of the sample per unit temperature in the range of 100 ° C. to 300 ° C. at this time was taken as the linear expansion coefficient.
- the charged concentration of the aromatic diamine and aromatic tetracarboxylic dianhydride in this reaction solution is 15% by weight with respect to the total reaction solution, and the total number of moles of aromatic tetracarboxylic dianhydride is the aromatic.
- the molar ratio divided by the total number of moles of diamine is 0.9975.
- an alkoxysilane-modified polyamic acid solution having a viscosity of 13700 mPa ⁇ s at 23 ° C. and a water content of 1400 ppm was obtained.
- the compounding ratio (addition amount) of the alkoxysilane compound ( ⁇ -APS) in this reaction is 0.050 part by weight with respect to 100 parts by weight of the polyamic acid.
- the obtained solution was stored in a sealed glass bottle in an environment of 23 ° C. and 55% RH for one week, and the viscosity was measured again to be 12400 mPa ⁇ s ( ⁇ 9%).
- the obtained alkoxysilane-modified polyamic acid solution is generally used as a glass substrate for FPD having a square of 150 mm on both sides and a thickness of 0.7 mm.
- the polyimide film and the alkali-free glass plate have an appropriate peel strength and do not peel naturally during heating, but it was possible to peel the polyimide film from the alkali-free glass plate. It shows in Table 1 about the characteristic of the obtained polyimide film.
- the charged concentration of aromatic diamine and aromatic tetracarboxylic dianhydride in this polyamic acid solution is 15% by weight with respect to the total reaction solution, and the total number of moles of aromatic tetracarboxylic dianhydride
- the molar ratio divided by the total number of moles of the group diamine is 0.9950.
- this polyamic acid solution was quickly cooled in a water bath, and the temperature of the polyamic acid solution was adjusted to about 50 ° C.
- 7.50 g of 1% DMAc solution of ⁇ -APS was added to the polyamic acid solution and stirred. Since the viscosity did not change from 19100 mPa ⁇ s, the reaction was completed after 5 hours, and the polyamic acid solution was diluted with DMAc until the viscosity became easy to work. In this way, an alkoxysilane-modified polyamic acid solution having a viscosity of 13800 mPa ⁇ s at 23 ° C. and a water content of 1900 ppm was obtained.
- the addition amount of (gamma) -APS in this reaction is 0.050 weight part with respect to 100 weight part of polyamic acids.
- the laminated body of a 22-micrometer-thick polyimide film and an alkali free glass plate was able to be obtained similarly to the method of the reference example 1, without peeling naturally. It shows in Table 1 and Table 2 about the viscosity change at the time of storage, and the characteristic of a polyimide film.
- the charged concentration of the aromatic diamine and aromatic tetracarboxylic dianhydride in this reaction solution is 15% by weight with respect to the total reaction solution, and the total number of moles of aromatic tetracarboxylic dianhydride is the aromatic.
- the molar ratio divided by the total number of moles of diamine is 0.9991.
- the reaction solution was quickly cooled in a water bath, and the temperature of the solution was adjusted to about 50 ° C. Next, 7.50 g of 1% DMAc solution of ⁇ -APS was added to the polyamic acid solution and stirred. Since the viscosity no longer changed, the reaction was completed in 3 hours, and the polyamic acid solution was diluted with DMAc until the viscosity became easy to work. In this way, an alkoxysilane-modified polyamic acid solution having a viscosity of 13500 mPa ⁇ s at 23 ° C. and a water content of 1500 ppm was obtained.
- the addition amount of (gamma) -APS in this reaction is 0.050 weight part with respect to 100 weight part of polyamic acids.
- the laminated body of the 20-micrometer-thick polyimide film and the alkali free glass plate was able to be obtained by the method similar to the method of the reference example 1.
- the polyimide film and the alkali-free glass plate have an appropriate peel strength and do not peel naturally during heating, but it was possible to peel the polyimide film from the alkali-free glass plate. It shows in Table 1 and Table 2 about the viscosity change at the time of storage, and the characteristic of a polyimide film.
- the charged concentration of the aromatic diamine and aromatic tetracarboxylic dianhydride in this reaction solution is 15% by weight with respect to the total reaction solution, and the total number of moles of aromatic tetracarboxylic dianhydride is the aromatic.
- the molar ratio divided by the total number of moles of diamine is 0.9901.
- the reaction solution was quickly cooled in a water bath, and the temperature of the solution was adjusted to about 50 ° C. Next, 7.50 g of 1% DMAc solution of ⁇ -APS was added to the polyamic acid solution and stirred. Since the viscosity no longer changed, the reaction was completed in 3 hours, and the polyamic acid solution was diluted with DMAc until the viscosity became easy to work. In this way, an alkoxysilane-modified polyamic acid solution having a viscosity of 13400 mPa ⁇ s at 23 ° C. and a water content of 1800 ppm was obtained.
- the addition amount of (gamma) -APS in this reaction is 0.050 weight part with respect to 100 weight part of polyamic acids.
- the laminated body of a 21-micrometer-thick polyimide film and an alkali free glass plate was able to be obtained by the method similar to the method of the reference example 1.
- the polyimide film and the alkali-free glass plate have an appropriate peel strength and do not peel naturally during heating, but it was possible to peel the polyimide film from the alkali-free glass plate. It shows in Table 1 and Table 2 about the viscosity change at the time of storage, and the characteristic of a polyimide film.
- the charged concentration of the aromatic diamine and aromatic tetracarboxylic dianhydride in this reaction solution is 15% by weight with respect to the total reaction solution, and the total number of moles of aromatic tetracarboxylic dianhydride is the aromatic.
- the molar ratio divided by the total number of moles of diamine is 0.9801.
- the reaction solution was quickly cooled in a water bath, and the temperature of the solution was adjusted to about 50 ° C.
- 7.50 g of 1% DMAc solution of ⁇ -APS was added to the polyamic acid solution and stirred. Since the viscosity no longer changed, the reaction was completed in 2 hours. In this way, an alkoxysilane-modified polyamic acid solution having a viscosity of 6100 mPa ⁇ s at 23 ° C. and a moisture content of 2200 ppm was obtained.
- the addition amount of (gamma) -APS in this reaction is 0.050 weight part with respect to 100 weight part of polyamic acids.
- the laminated body of the 20-micrometer-thick polyimide film and the alkali free glass plate was able to be obtained by the method similar to the method of the reference example 1.
- the polyimide film and the alkali-free glass plate have an appropriate peel strength and do not peel naturally during heating, but it was possible to peel the polyimide film from the alkali-free glass plate. It shows in Table 1 and Table 2 about the viscosity change at the time of storage, and the characteristic of a polyimide film.
- Example 1 An alkoxysilane-modified polyamic acid solution was obtained in the same manner as in Reference Example 1 except that the addition amount of the 1% DMAc solution of ⁇ -APS was changed to 13.50 g. In addition, the addition amount of (gamma) -APS in this reaction is 0.090 weight part with respect to 100 weight part of polyamic acids. The resulting solution had a viscosity of 13500 mPa ⁇ s at 23 ° C. and a water content of 1700 ppm. Moreover, the laminated body of the 20-micrometer-thick polyimide film and the alkali free glass plate was able to be obtained like the method of the reference example 1, without peeling naturally. It shows in Table 1 and Table 2 about the viscosity change at the time of storage, and the characteristic of a polyimide film.
- Example 2 An alkoxysilane-modified polyamic acid solution was obtained in the same manner as in Reference Example 1 except that the addition amount of the 1% DMAc solution of ⁇ -APS was changed to 8.25 g. In addition, the addition amount of (gamma) -APS in this reaction is 0.055 weight part with respect to 100 weight part of polyamic acids. The resulting solution had a viscosity of 13200 mPa ⁇ s at 23 ° C. and a water content of 1500 ppm. Moreover, the laminated body of the 20-micrometer-thick polyimide film and the alkali free glass plate was able to be obtained like the method of the reference example 1, without peeling naturally. It shows in Table 1 and Table 2 about the viscosity change at the time of storage, and the characteristic of a polyimide film.
- the charged concentration of the aromatic diamine and aromatic tetracarboxylic dianhydride in this reaction solution is 15% by weight with respect to the total reaction solution, and the total number of moles of aromatic tetracarboxylic dianhydride is the aromatic.
- the molar ratio divided by the total number of moles of diamine is 1.0070.
- reaction solution was quickly cooled in a water bath, and the temperature of the solution was adjusted to about 50 ° C.
- 7.50 g of 1% DMAc solution of ⁇ -APS was added to the polyamic acid solution and stirred. Since the viscosity did not change from 19100 mPa ⁇ s, the reaction was completed after 5 hours, and the polyamic acid solution was diluted with DMAc until the viscosity became easy to work. In this way, an alkoxysilane-modified polyamic acid solution having a viscosity of 13600 mPa ⁇ s at 23 ° C. and a water content of 1400 ppm was obtained.
- the addition amount of (gamma) -APS in this reaction is 0.050 weight part with respect to 100 weight part of polyamic acids.
- the laminated body of the polyimide film and the alkali free glass board was able to be obtained like the method of the reference example 1, without natural peeling. It shows in Table 1 and Table 2 about the viscosity change at the time of storage, and the characteristic of a polyimide film.
- Comparative Example 3 To the solution obtained in Comparative Example 2, water corresponding to 0.1% by weight with respect to the solution was added. The resulting solution had a viscosity of 13300 mPa ⁇ s at 23 ° C. and a moisture content of 2600 ppm. Table 1 shows the change in viscosity during storage.
- Comparative Example 4 To the solution obtained in Comparative Example 2, water corresponding to 0.3% by weight with respect to the solution was added. The resulting solution had a viscosity of 13300 mPa ⁇ s at 23 ° C. and a moisture content of 4800 ppm. Table 1 shows the change in viscosity during storage.
- Table 2 shows the results of evaluating the adhesion and linear expansion coefficient of the polyimide films obtained from the respective solutions to the alkali-free glass plate.
- adhesion when there is no gap between the polyimide film and the alkali-free glass plate and the polyimide film has a uniform appearance, there is a gap between the polyimide film and the alkali-free glass plate.
- X when bubbles or the like are generated inside the polyimide film.
- Reference Examples 7 and 8 have the same moisture content as Comparative Example 4, but the viscosity change rate is small.
- Reference Examples 5 and 6 and Comparative Example 2 have a viscosity change rate of about 1400 ppm with respect to about 3000 ppm, and the viscosity change rate is about the same even though the water content is about twice as high.
- A The value obtained by dividing the viscosity change rate by the viscosity change rate of the comparative example of the same level of water is 0.4 or less.
- B The value obtained by dividing the viscosity change rate by the viscosity change rate of the comparative example of the same level of water. More than 0.4 and 0.5 or less
- C The value obtained by dividing the viscosity change rate by the viscosity change rate of the comparative water sample is more than 0.5 and 0.6 or less.
- D The viscosity change rate is the same.
- the value divided by the viscosity change rate of the comparative example of water is greater than 0.6 and less than or equal to 0.7 E:
- the value obtained by dividing the viscosity change rate by the viscosity change rate of the comparative example of the same moisture content is from 0.7 Large
- the comprehensive evaluation of the comparative example is “ ⁇ ”, it indicates that the comparative example is a reference for comparison with the reference example and the example in the comprehensive evaluation.
- a comparative example of the same level of water for a certain example or reference example (referred to as example ⁇ or reference example ⁇ ) means that, in Comparative Examples 2 to 4, Example ⁇ or Reference Example ⁇ This indicates a comparative example in which the absolute value of the difference in moisture is the smallest.
- the absolute value of the water difference from Comparative Example 2 is 1900
- the absolute value of the water difference from Comparative Example 3 is 700
- the absolute value of the water difference from Comparative Example 4 is 1500. It is. Therefore, Reference Example 6 is evaluated by comparison with Comparative Example 3.
- Reference Examples 1, 3, 9 and 10 were compared with Comparative Example 2 having the same level of moisture. Further, Reference Examples 2, 4 to 6 and 11 were compared with Comparative Example 3 having a similar moisture content. Reference Examples 7 and 8 were compared with Comparative Example 4 which has similar moisture.
- the overall evaluation is A, B, or C.
- the overall evaluation is A or B.
- Examples 1 and 2 were compared with Comparative Example 2 having the same level of moisture.
- the overall evaluation is A. This shows that the viscosity change rate can be suppressed when the addition amount of the alkoxysilane compound containing an amino group is more than 0.050 parts by weight and less than 0.100 parts by weight.
- the polyimide films of Reference Examples 1 to 3 and 9 to 11 do not generate bubbles between the polyimide film and the alkali-free glass plate even with a dry thickness of about 20 ⁇ m, and are a laminate of the polyimide film and the alkali-free glass plate.
- Bubbles are generated between the polyimide film and the alkali-free glass plate even with a dry thickness of about 20 ⁇ m, and a laminate of the polyimide film and the alkali-free glass plate can be obtained. There wasn't.
- the polyimide films of Reference Examples 1 to 3, 9 to 11 and Comparative Example 2 did not curl or warp even after peeling from the alkali-free glass plate. This is because these polyimide films have a linear expansion coefficient of 6 to 8 ppm / ° C., which is close to the linear expansion coefficient of the alkali-free glass plate.
- the polyimide films of Examples 1 and 2 do not generate bubbles between the polyimide film and the alkali-free glass plate even with a dry thickness of about 20 ⁇ m, and a laminate of the polyimide film and the alkali-free glass plate can be obtained. did it.
- polyimide films of Examples 1 and 2 did not curl or warp even after peeling from the alkali-free glass plate. This is because these polyimide films have a linear expansion coefficient of 6 to 8 ppm / ° C., which is close to the linear expansion coefficient of the alkali-free glass plate.
- a polyamic acid solution that can be formed without peeling even with a thick film and can be stably stored at room temperature, and a polyimide film and an inorganic substrate that can be suitably used for the production of flexible devices And a laminated body can be provided.
- the present invention can be suitably used in the field of electronic devices such as flat panel displays and electronic paper.
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Abstract
Description
本発明のアルコキシシラン変性ポリアミド酸溶液(以下、単に「溶液」ともいう)は、アミノ基を含有するアルコキシシラン化合物とポリアミド酸とを溶液中で反応させることにより得られる。また、ポリアミド酸は芳香族ジアミンと芳香族テトラカルボン酸二無水物とを溶媒中で反応させることで得られる。
前述のように、ポリアミド酸の原料には芳香族テトラカルボン酸二無水物と芳香族ジアミンとが用いられる。
式(1)の芳香族ジアミンは、パラフェニレンジアミン(以下PDAと略記することもある。)、4,4’-ジアミノベンジジン、及び4,4”-ジアミノパラテルフェニル(以下、DATPと略記することもある。)である。これらの芳香族ジアミンの中でも、入手性の良いことからPDA、及びDATPが好ましい。
本発明に用いるポリアミド酸は、溶液重合により製造可能である。すなわち、原料である1種または2種以上の芳香族テトラカルボン酸二無水物、及び1種または2種以上の芳香族ジアミンを、芳香族ジアミンのモル比がカルボキシル基よりも高くなるように使用し、有機極性溶媒中で重合してポリイミド前駆体であるポリアミド酸溶液を得る。
これまでのすべてのアルコキシシラン変性ポリアミド酸溶液中の水分は、500ppm以上3000ppm以下であることが好ましく、500ppm以上1000ppm以下であることがより好ましい。水分が3000ppm以下であればモル比の調整による貯蔵安定性向上の効果が十分に発揮されるため好ましい。1000ppm以下の場合、ポリアミド酸分子中のアミド結合の分解によって生じた酸無水物基と水とが反応して失活する確率を下げることにより、ワニス保管時の粘度変化を抑制できるためより好ましい。溶液中の水分は、原料由来と作業環境由来とに分けることができる。水分を減らすために様々な方法があるが、余分な工程または過剰な設備を用いて必要以上に水分を減らすことも、コストアップになるため好ましくない。例えば、市販のアミド系溶剤の水分は500ppm程度であるため、それ以下に水分を減らそうとするとコストアップが伴うので好ましくない。
芳香族テトラカルボン酸二無水物の総モル数を、芳香族ジアミンの総モル数で除したモル比の好ましい値は、アルコキシシラン変性ポリアミド酸溶液の水分との関係によっても変化し得る。
ポリイミドフィルムと無機基板とを有する積層体は、前述したアルコキシシラン変性ポリアミド酸溶液を、無機基板上に流延し、熱イミド化することによって製造することができる。上記積層体はアルコキシシラン変性ポリアミド酸溶液から得られたポリイミドフィルムが無機基板上に積層された積層体であるとも言える。
本発明の積層体を用いることで、優れた特性を有するフレキシブルデバイスを得ることができる。すなわち、本発明の積層体のポリイミドフィルム上に、電子素子を形成し、その後、該ポリイミドフィルムを無機基板から剥離することでフレキシブルデバイスを得ることができる。さらに、上記工程は、既存の無機基板を使用した生産装置をそのまま使用できるという利点があり、フラットパネルディスプレイ及び電子ペーパーなどの電子デバイスの分野で有効に使用でき、大量生産にも適している。
(水分)
容量滴定カールフィッシャー水分計 890タイトランド(メトロームジャパン株式会社製)を用いて、JIS K0068の容量滴定法に準じて溶液中の水分を測定した。ただし、滴定溶剤中に樹脂が析出する場合は、アクアミクロンGEX(三菱化学株式会社製)とN-メチルピロリドンとの1:4の混合溶液を滴定溶剤として用いた。
粘度計 RE-215/U(東機産業株式会社製)を用い、JIS K7117-2:1999に準じて粘度を測定した。付属の恒温槽を23.0℃に設定し、測定温度は常に一定にした。
線膨張係数は、エスアイアイ・ナノテクノロジー株式会社製TMA/SS120CUを用い、引張荷重法による熱機械分析によって評価した。実施例のポリイミドフィルムを無機基板であるガラス基板から引き剥がして、10mm×3mmの試料を作製した。該試料の長辺に3.0gの荷重を加え、500℃以上に加熱して残留応力を取り除いた後、再び10℃/分の昇温速度で加熱して測定した。この際の100℃~300℃の範囲における単位温度あたりの試料の歪の変化量を線膨張係数とした。
(1-1)ポリアミド酸溶液の製造
ポリテトラフルオロエチレン製シール栓付き攪拌器、攪拌翼、及び、窒素導入管を備えた容積2Lのガラス製セパラブルフラスコに、モレキュラーシーブを用いて脱水したN,N-ジメチルアセトアミド(DMAc)を850.0g入れ、パラフェニレンジアミン(PDA)40.31gを加え、得られた溶液を油浴で50.0℃に加熱しながら窒素雰囲気下で30分間攪拌した。原料が均一に溶解したことを確認した後、3,3’,4,4’-ビフェニルテトラカルボン酸二無水物(BPDA)109.41gを加え、原料が完全に溶解するまで窒素雰囲気下で10分間攪拌しながら、溶液の温度を約80℃に調整した。さらに一定の温度で加熱しながら攪拌を3時間続けて粘度を下げ、さらにDMAcを153.8g加えて攪拌し、23℃で粘度25000mPa・sを示す粘調なポリアミド酸溶液を得た。なお、この反応溶液における芳香族ジアミン及び芳香族テトラカルボン酸二無水物の仕込み濃度は全反応液に対して15重量%であり、芳香族テトラカルボン酸二無水物の総モル数を、芳香族ジアミンの総モル数で除したモル比は、0.9975である。
上記のポリアミド酸溶液を水浴で速やかに冷却し、ポリアミド酸溶液の温度を約50℃に調整した。次に3-アミノプロピルトリエトキシシラン(γ―APS)の1%DMAc溶液7.50gをポリアミド酸溶液に加え、攪拌した。23000mPa・sから粘度が変化しなくなったので5時間後に反応を終え、作業しやすい粘度になるまでDMAcでポリアミド酸溶液を希釈した。この様にして23℃で粘度13700mPa・sであり水分が1400ppmを示すアルコキシシラン変性ポリアミド酸溶液を得た。なお、この反応におけるアルコキシシラン化合物(γ―APS)の配合割合(添加量)は、ポリアミド酸100重量部に対して0.050重量部である。
得られたアルコキシシラン変性ポリアミド酸溶液を、両辺150mm、厚さ0.7mmの正方形の、FPD用のガラス基板として一般的に用いられている無アルカリガラス板(コーニング社製 イーグルXG)上に、バーコーターを用いて乾燥厚みが20μmになるように流延し、熱風オーブン内で80℃にて20分乾燥し、次いで150℃にて30分間乾燥した。さらに、220℃と300℃とで30分ずつ、430℃と500℃とで1時間ずつ加熱した。それぞれの温度間は2℃/分で徐々に昇温した。高温で熱イミド化することで、厚み19μmのポリイミドフィルムと無アルカリガラス板との積層体を得た。ポリイミドフィルムと無アルカリガラス板とは適度な剥離強度を有しており、加熱中に自然に剥離することはないが、無アルカリガラス板からポリイミドフィルムを引き剥がすことが可能であった。得られたポリイミドフィルムの特性について、表1に示す。
γ-APSの1%DMAc溶液の添加量を1.50gに変更した以外は、参考例1と同様にして、アルコキシシラン変性ポリアミド酸溶液を得た。なお、この反応におけるγ―APSの添加量は、ポリアミド酸100重量部に対して0.010重量部である。得られた溶液は23℃で粘度13100mPa・sであり水分が2800ppmであった。また、参考例1の方法と同様にして自然剥離せずに厚み20μmのポリイミドフィルムと無アルカリガラス板との積層体を得ることができた。保管時の粘度変化及びポリイミドフィルムの特性について表1及び表2に示す。
参考例1と同じ実験装置に脱水したDMAcを850.0g入れ、PDA40.39gを加え、得られた溶液を油浴で50.0℃に加熱しながら窒素雰囲気下で30分間攪拌した。原料が均一に溶解したことを確認した後、BPDA109.34gを加え、原料が完全に溶解するまで窒素雰囲気下で10分間攪拌しながら、溶液の温度を約80℃に調整した。さらに一定の温度で加熱しながら攪拌を5時間続けて粘度を下げ、23℃で粘度25300mPa・sを示す粘調なポリアミド酸溶液を得た。なお、このポリアミド酸溶液における芳香族ジアミン及び芳香族テトラカルボン酸二無水物の仕込み濃度は全反応液に対して15重量%であり、芳香族テトラカルボン酸二無水物の総モル数を、芳香族ジアミンの総モル数で除したモル比は、0.9950である。
水分量が異なるDMAcを使用した以外は、参考例1と同様にしてアルコキシシラン変性ポリアミド酸溶液を得た。得られた溶液は23℃で粘度14200mPa・sであり水分が2500ppmであった。保管時の粘度変化について表1に示す。
参考例1と同様にして得られたアルコキシシラン変性ポリアミド酸溶液を、乾燥窒素で加圧し、日本ポール株式会社製カプセルフィルターDFA HDC2(定格ろ過精度1.2μm)でろ過した。ろ過作業後、未ろ過で残った溶液は、23℃で粘度12700mPa・sであり水分が2700ppmであった。保管時の粘度変化について表1に示す。
参考例1と同様にして得られたアルコキシシラン変性ポリアミド酸溶液を、乾燥窒素で加圧し、日本ポール株式会社製カプセルフィルターDFA HDC2(定格ろ過精度1.2μm)でろ過した。ろ過した溶液は、23℃で粘度12000mPa・sであり水分が3300ppmであった。保管時の粘度変化について表1に示す。
参考例1と同様にして得られたアルコキシシラン変性ポリアミド酸溶液を大気下で開封したまま60分間静置した後、均一に攪拌した。得られた溶液は吸湿しており、23℃で粘度12100mPa・sであり水分が4400ppmであった。この溶液の保管時の粘度変化について表1に示す。
参考例4で得られた溶液に、溶液に対して0.3重量%相当の水を添加した。得られた溶液は23℃で粘度13800mPa・sであり水分が4900ppmであった。保管時の粘度変化について表1に示す。
参考例1と同じ実験装置に脱水したDMAcを850.0g入れ、PDA40.34gを加え、得られた溶液を油浴で50.0℃に加熱しながら窒素雰囲気下で30分間攪拌した。原料が均一に溶解したことを確認した後、BPDA109.66gを加え、原料が完全に溶解するまで窒素雰囲気下で10分間攪拌しながら、溶液の温度を約90℃に調整した。さらに一定の温度で加熱しながら攪拌を続けて粘度を下げ、23℃で粘度35500mPa・sを示す粘調なポリアミド酸溶液を得た。なお、この反応溶液における芳香族ジアミン及び芳香族テトラカルボン酸二無水物の仕込み濃度は全反応液に対して15重量%であり、芳香族テトラカルボン酸二無水物の総モル数を、芳香族ジアミンの総モル数で除したモル比は、0.9991である。
参考例1と同じ実験装置に脱水したDMAcを850.0g入れ、PDA40.61gを加え、得られた溶液を油浴で50.0℃に加熱しながら窒素雰囲気下で30分間攪拌した。原料が均一に溶解したことを確認した後、BPDA109.39gを加え、原料が完全に溶解するまで窒素雰囲気下で10分間攪拌しながら、溶液の温度を約80℃に調整した。さらに一定の温度で加熱しながら攪拌を続けて粘度を下げ、23℃で粘度31200mPa・sを示す粘調なポリアミド酸溶液を得た。なお、この反応溶液における芳香族ジアミン及び芳香族テトラカルボン酸二無水物の仕込み濃度は全反応液に対して15重量%であり、芳香族テトラカルボン酸二無水物の総モル数を、芳香族ジアミンの総モル数で除したモル比は、0.9901である。
参考例1と同じ実験装置に脱水したDMAcを850.0g入れ、PDA40.91gを加え、得られた溶液を油浴で50.0℃に加熱しながら窒素雰囲気下で30分間攪拌した。原料が均一に溶解したことを確認した後、BPDA109.09gを加え、原料が完全に溶解するまで窒素雰囲気下で10分間攪拌しながら、溶液の温度を約80℃に調整した。さらに一定の温度で加熱しながら攪拌を続けて粘度を下げ、23℃で粘度6300mPa・sを示す粘調なポリアミド酸溶液を得た。なお、この反応溶液における芳香族ジアミン及び芳香族テトラカルボン酸二無水物の仕込み濃度は全反応液に対して15重量%であり、芳香族テトラカルボン酸二無水物の総モル数を、芳香族ジアミンの総モル数で除したモル比は、0.9801である。
γ-APSの1%DMAc溶液の添加量を13.50gに変更した以外は、参考例1と同様にして、アルコキシシラン変性ポリアミド酸溶液を得た。なお、この反応におけるγ―APSの添加量は、ポリアミド酸100重量部に対して0.090重量部である。得られた溶液は23℃で粘度13500mPa・sであり水分が1700ppmであった。また、参考例1の方法と同様にして自然剥離せずに厚み20μmのポリイミドフィルムと無アルカリガラス板との積層体を得ることができた。保管時の粘度変化及びポリイミドフィルムの特性について表1及び表2に示す。
γ-APSの1%DMAc溶液の添加量を8.25gに変更した以外は、参考例1と同様にして、アルコキシシラン変性ポリアミド酸溶液を得た。なお、この反応におけるγ―APSの添加量は、ポリアミド酸100重量部に対して0.055重量部である。得られた溶液は23℃で粘度13200mPa・sであり水分が1500ppmであった。また、参考例1の方法と同様にして自然剥離せずに厚み20μmのポリイミドフィルムと無アルカリガラス板との積層体を得ることができた。保管時の粘度変化及びポリイミドフィルムの特性について表1及び表2に示す。
参考例1と同様にしてポリアミド酸溶液を得た後、γ―APSを添加せずに作業しやすい粘度になるまでDMAcで希釈し、粘度13600mPa・sであり水分が1100ppmを示すアルコキシシラン変性ポリアミド酸溶液を得た。得られた溶液を参考例1と同様にして無アルカリガラス板上に流延及びイミド化したが、熱イミド化の際にポリイミドフィルムと無アルカリガラス板との間に気泡が発生し、一部が剥離したポリイミドフィルムと無アルカリガラス板との積層体しか得ることができなかった。得られたポリイミドフィルムの特性について表2に示す。
参考例1と同じ反応容器に脱水したDMAcを850.0g入れ、BPDA110.08gを加え、攪拌して分散させた。分散液を油浴で50.0℃に加熱しながら、PDA40.17gを30分程度かけて徐々に加えた。原料が完全に溶解し粘度が一定になるまで1時間攪拌を続けた。さらにDMAcを250g加えて攪拌し、粘度20100mPa・sを示す粘調なポリアミド酸溶液を得た。なお、この反応溶液における芳香族ジアミン及び芳香族テトラカルボン酸二無水物の仕込み濃度は全反応液に対して15重量%であり、芳香族テトラカルボン酸二無水物の総モル数を、芳香族ジアミンの総モル数で除したモル比は、1.0070である。
比較例2で得られた溶液に、溶液に対して0.1重量%相当の水を添加した。得られた溶液は23℃で粘度13300mPa・sであり水分が2600ppmであった。保管時の粘度変化について表1に示す。
比較例2で得られた溶液に、溶液に対して0.3重量%相当の水を添加した。得られた溶液は23℃で粘度13300mPa・sであり水分が4800ppmであった。保管時の粘度変化について表1に示す。
B:粘度変化率を、同程度の水分の比較例の粘度変化率で除した値が0.4より大きく0.5以下
C:粘度変化率を、同程度の水分の比較例の粘度変化率で除した値が0.5より大きく0.6以下
D:粘度変化率を、同程度の水分の比較例の粘度変化率で除した値が0.6より大きく0.7以下
E:粘度変化率を、同程度の水分の比較例の粘度変化率で除した値が0.7より大きい
ここで、比較例の総合評価が「-」となっている場合は、当該比較例が、総合評価において参考例及び実施例と比較する基準となっていることを表す。
Claims (10)
- アミノ基を含有するアルコキシシラン化合物とポリアミド酸とを溶液中で反応させることにより得られるアルコキシシラン変性ポリアミド酸溶液であり、
前記ポリアミド酸は、芳香族ジアミンと芳香族テトラカルボン酸二無水物とを溶媒中で反応させることにより得られ、
前記芳香族テトラカルボン酸二無水物の総モル数を、前記芳香族ジアミンの総モル数で除したモル比が、0.980以上0.9995以下であり、
前記アルコキシシラン化合物の添加量は、前記アルコキシシラン変性ポリアミド酸溶液中に含まれるポリアミド酸の量を100重量部とした場合に、0.050重量部を超えて0.100重量部未満であることを特徴とするアルコキシシラン変性ポリアミド酸溶液。 - 前記アルコキシシラン変性ポリアミド酸溶液の水分は、500ppm以上3000ppm以下であることを特徴とする請求項1に記載のアルコキシシラン変性ポリアミド酸溶液。
- 前記溶媒の主成分がアミド系溶媒であることを特徴とする請求項1~3のいずれか1項に記載のアルコキシシラン変性ポリアミド酸溶液。
- 請求項1~4のいずれか1項に記載のアルコキシシラン変性ポリアミド酸溶液を無機基板上に流延し、熱イミド化することによって、該アルコキシシラン変性ポリアミド酸溶液から得られたポリイミドフィルムが該無機基板上に積層された積層体を得る工程を含むことを特徴とする積層体の製造方法。
- 請求項5に記載の積層体の製造方法によって得られた積層体において、ポリイミドフィルム上に電子素子を形成する工程と、
前記電子素子が形成されたポリイミドフィルムを無機基板より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。 - 請求項1~4のいずれか1項に記載のアルコキシシラン変性ポリアミド酸溶液から得られるポリイミドフィルムと、該ポリイミドフィルムが積層された無機基板とを有する積層体であって、
前記ポリイミドフィルムの線膨張係数が1~10ppm/℃であることを特徴とする積層体。 - 前記無機基板の厚みが、0.4~5.0mmであり、
前記ポリイミドフィルムの厚みが、10~50μmであることを特徴とする請求項7に記載の積層体。 - 請求項1~4のいずれか1項に記載のアルコキシシラン変性ポリアミド酸溶液から得られるポリイミドフィルムと、該ポリイミドフィルム上に形成された電子素子とを有することを特徴とするフレキシブルデバイス。
- 芳香族ジアミンと芳香族テトラカルボン酸二無水物とを溶媒中で反応させることによりポリアミド酸を得る工程と、
アミノ基を含有するアルコキシシラン化合物と前記ポリアミド酸とを溶液中で反応させることによりアルコキシシラン変性ポリアミド酸溶液を得る工程とを含んでおり、
前記芳香族テトラカルボン酸二無水物の総モル数を、前記芳香族ジアミンの総モル数で除したモル比が、0.980以上0.9995以下であり、
前記アルコキシシラン化合物の添加量は、前記アルコキシシラン変性ポリアミド酸溶液中に含まれるポリアミド酸の量を100重量部とした場合に、0.050重量部を超えて0.100重量部未満であることを特徴とするアルコキシシラン変性ポリアミド酸溶液の製造方法。
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JP (2) | JP6807231B2 (ja) |
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JP7431039B2 (ja) * | 2017-12-26 | 2024-02-14 | 株式会社カネカ | ポリアミド酸組成物およびその製造方法、ポリイミドフィルム、積層体およびその製造方法、ならびにフレキシブルデバイス |
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JP2020094206A (ja) * | 2018-12-04 | 2020-06-18 | ユニチカ株式会社 | ポリアミック酸溶液およびこれを用いた積層体の製造方法 |
JP7461626B2 (ja) | 2018-12-04 | 2024-04-04 | ユニチカ株式会社 | ポリアミック酸溶液およびこれを用いた積層体の製造方法 |
WO2024058194A1 (ja) * | 2022-09-16 | 2024-03-21 | 三菱瓦斯化学株式会社 | ポリイミドフィルムの製造方法 |
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US20170233530A1 (en) | 2017-08-17 |
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JP6858900B2 (ja) | 2021-04-14 |
KR20170041798A (ko) | 2017-04-17 |
KR102294065B1 (ko) | 2021-08-26 |
JP6807231B2 (ja) | 2021-01-06 |
US10308767B2 (en) | 2019-06-04 |
CN106574051A (zh) | 2017-04-19 |
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