CN116438224A - Polyimide film and optical device comprising same - Google Patents

Polyimide film and optical device comprising same Download PDF

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CN116438224A
CN116438224A CN202180077600.6A CN202180077600A CN116438224A CN 116438224 A CN116438224 A CN 116438224A CN 202180077600 A CN202180077600 A CN 202180077600A CN 116438224 A CN116438224 A CN 116438224A
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mol
polyimide film
film
optical device
dianhydride
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柳大建
金烔暎
元东荣
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Polyimide Advanced Materials Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • 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
    • 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
    • C08G73/1042—Copolyimides derived from at least two different tetracarboxylic compounds or two different diamino compounds
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2379/00—Characterised by the use of 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 C08J2361/00 - C08J2377/00
    • C08J2379/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
    • C08J2379/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
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  • Macromolecular Compounds Obtained By Forming Nitrogen-Containing Linkages In General (AREA)
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Abstract

Disclosed are a polyimide film which satisfies a predetermined formula 1 and has a maximum elongation of 50% or more as measured according to ASTM D882, and an optical device comprising the same.

Description

Polyimide film and optical device comprising same
Technical Field
The present invention relates to a polyimide film and an optical device including the same, and more particularly, to a polyimide film satisfying physical properties required for a film for an optical device, such as modulus, elongation, strength, and the like, and an optical device including the same.
Background
Flexible displays such as curved, flexible, foldable, rollable, etc. are the next generation of displays of interest in both the recent academia and industry. Among various materials constituting flexible displays, a functional film/coating material is attracting attention as an important polymer substrate material constituting the flexible display, which is a core material necessary for successful realization and development of the flexible display, and polyimide is attracting attention as such a material.
Polyimide is a polymer characterized by having a hybrid imide ring in the main chain, and is widely used for coating materials, molding materials, composite materials, and the like because of its excellent mechanical properties, flame retardancy, chemical resistance, low dielectric constant, and the like, in addition to its excellent heat resistance.
The most important physical property required for a polymer substrate for a flexible display is just called flexibility. In particular, such a polymer substrate should not be damaged during bending, folding, curling and stretching, which repeatedly deform the flexible display, but should not lose various initial physical properties.
Disclosure of Invention
Technical problem
The purpose of the present invention is to provide a polyimide film that satisfies the physical properties required for films for optical devices, such as modulus, elongation, strength, and the like.
Another object of the present invention is to provide an optical device comprising the polyimide film.
Means for solving the problems
1. According to one aspect, a polyimide film is provided. The polyimide film satisfies the following formula 1, and may have a maximum elongation of 50% or more as measured according to ASTM D882:
< 1>
45≤(A×B)/10≤60
In the formula 1, the components are mixed,
a is the modulus (unit: GPa) of a polyimide film measured at a stretching speed of 200mm/min according to ASTM D882,
b is the tensile strength (unit: MPa) at 20% elongation of the polyimide film measured at a tensile speed of 200mm/min in accordance with ASTM D882.
2. In the first embodiment, a may be 2.5GPa to 4.5GPa.
3. In the first or second embodiment, B may be 140MPa or more.
4. In any of the first to third embodiments, the polyimide film is derived from imidization of a polyamic acid formed by a reaction of a dianhydride monomer and a diamine monomer, and the dianhydride monomer may include 55 to 85 mol% of pyromellitic dianhydride (pyromellitic dianhydride:pmda) and 15 to 45 mol% of 3,3', 4' -biphenyl tetracarboxylic dianhydride (3, 3', 4' -biphenyl tetracarboxylic dianhydride:bpda) based on the total mole number of the dianhydride monomer, and may include 50 to 80 mol% of 4,4' -diaminodiphenyl ether (ODA) and 20 to 50 mol% of 4,4' -diaminodiphenyl methane (4, 4' -methylenedianiline: MDA) based on the total mole number of the diamine monomer.
5. In the fourth embodiment described above, the molar ratio of PMDA to MDA (PMDA: MDA) may be 1.1:1 to 3.25:1.
6. In the fourth or fifth embodiment, the molar ratio of the BPDA to the MDA (BPDA: MDA) may be 0.3:1 to 1.75:1.
7. According to another aspect, an optical device is provided. The optical device may include any one of the polyimide films of the first to sixth embodiments.
8. In the seventh embodiment, the optical device is a display device, and the polyimide film may be included as a back plate film (back plate film).
Effects of the invention
The present invention has an effect of providing a polyimide film satisfying physical properties required for a film for an optical device, such as modulus, elongation, strength, etc., and an optical device including the same.
Detailed Description
Best mode for carrying out the invention
In this specification, the expression in the singular includes the expression in the plural unless the context clearly indicates otherwise.
In the present specification, the inclusion or inclusion of terms means that there is a feature or a component described in the specification, and that there is no possibility that one or more other features or components are added in advance.
In explaining the constituent elements, the explanation is made in such a manner as to include an error range even if no separate explicit description is made.
In the present specification, "to" in "a to b" representing a numerical range is defined as ≡a and ≡b.
The polyimide film of one aspect of the present invention satisfies the following formula 1, and may have a maximum elongation of 50% or more as measured according to ASTM D882:
< 1>
45≤(A×B)/10≤60
In the formula 1, A is the modulus (unit: GPa) of the polyimide film measured at a tensile speed of 200mm/min according to ASTM D882, and B is the tensile strength (unit: MPa) at 20% elongation of the polyimide film measured at a tensile speed of 200mm/min according to ASTM D882.
The polyimide film may satisfy the above formula 1. Thus, it is possible to advantageously provide a polyimide film satisfying physical properties, such as modulus, elongation, strength, and the like, required for a film for an optical device. For example, the lower limit of the (a×b)/10 value may be any one of 45, 46, 47, 48, 49, and 50, and the upper limit may be any one of 60, 59, 58, 57, 56, 55, 54, 53, 52, and 51. According to an embodiment, the value of (a×b)/10 may be 45 to 55, but is not limited thereto.
The polyimide film may have a maximum elongation of 50% or more (e.g., 55% or more, 60% or more, 65% or more, 70% or more, 75% or more, 80% or more, 85% or more, or 90% or more) as measured at a stretch rate of 200mm/min according to ASTM D882. In the above range, it is advantageous to provide a polyimide film satisfying physical properties required for the film for an optical device, such as modulus, elongation, strength, and the like. The maximum elongation of the polyimide film may be, for example, 50% to 150%, further, for example, 50% to 100%, further, for example, 55% to 95%, but is not limited thereto.
According to an embodiment, in formula 1, a may be 2.5GPa to 4.5GPa (e.g., 2.5GPa, 2.6GPa, 2.7GPa, 2.8GPa, 2.9GPa, 3.0GPa, 3.1GPa, 3.2GPa, 3.3GPa, 3.4GPa, 3.5GPa, 3.6GPa, 3.7GPa, 3.8GPa, 3.9GPa, 4.0GPa, 4.1GPa, 4.2GPa, 4.3GPa, 4.4GPa, or 4.5 GPa). In the above range, it is advantageous to provide a polyimide film satisfying physical properties required for the film for an optical device, such as modulus, elongation, strength, and the like. A may be, for example, 2.5GPa to 4GPa, further, for example, 3GPa to 3.5GPa, but is not limited thereto.
According to an embodiment, in the above formula 1, B may be 140MPa or more (e.g., 141MPa or more, 142MPa or more, 143MPa or more, 144MPa or more, or 145MPa or more). In the above range, it is advantageous to provide a polyimide film satisfying physical properties required for the film for an optical device, such as modulus, elongation, strength, and the like. B may be, for example, 140MPa to 300MPa, further, for example, 140MPa to 200MPa, further, for example, 140MPa to 170MPa, further, for example, 140MPa to 160MPa, but is not limited thereto.
According to an embodiment, the thickness of the polyimide film may be, for example, 10 μm to 500 μm, further, for example, 10 μm to 100 μm, further, for example, 30 μm to 50 μm, but is not limited thereto.
According to one embodiment, the polyimide film may result from imidization of a polyamic acid formed from the reaction of a dianhydride monomer with a diamine monomer. As for the kinds of the dianhydride monomer and the diamine monomer, known dianhydride monomers and diamine monomers can be used without limitation within a range that does not hinder the object of the present invention. For example, the dianhydride monomer may contain pyromellitic dianhydride (pyromellitic dianhydride: PMDA) and 3,3', 4' -biphenyl tetracarboxylic dianhydride (3, 3', 4' -biphenyl tetracarboxylic dianhydride: BPDA), and the diamine monomer may contain 4,4'-Oxydianiline (ODA) and 4,4' -diaminodiphenyl Methane (MDA), in which case it can be more advantageous to provide a polyimide film satisfying the physical properties required in the film for optical devices, such as modulus, elongation, strength, and the like. According to an embodiment, the dianhydride monomer may include 55 to 85 mole% PMDA and 15 to 45 mole% BPDA based on the total mole number of the dianhydride monomer, and the diamine monomer may include 50 to 80 mole% ODA and 20 to 50 mole% MDA based on the total mole number of the diamine monomer. In the above range, it is more advantageous to provide a polyimide film satisfying physical properties required for the film for an optical device, such as modulus, elongation, strength, and the like. For example, the dianhydride monomer may include 55 mol%, 56 mol%, 57 mol%, 58 mol%, 59 mol%, 60 mol%, 61 mol%, 62 mol%, 63 mol%, 64 mol%, 65 mol%, 66 mol%, 67 mol%, 68 mol%, 69 mol%, 70 mol%, 71 mol%, 72 mol%, 73 mol%, 74 mol%, 75 mol%, 76 mol%, 77 mol%, 78 mol%, 79 mol%, 80 mol%, 81 mol%, 82 mol%, 83 mol%, 84 mol%, or 85 mol% of PMDA based on the total mole number of the dianhydride monomer, and 45 mol%, 44 mol%, 43 mol%, 42 mol%, 41 mol%, 40 mol%, 39 mol%, 38 mol%, 37 mol%, 36 mol%, 35 mol%, 34 mol%, 33 mol%, 32 mol%, 31 mol%, 30 mol%, 29 mol%, 28 mol%, 27 mol%, 26 mol%, 25 mol%, 24 mol%, 23 mol%, 22 mol%, 21 mol%, 20 mol%, 19 mol%, 17 mol%, 16 mol%, or 15 mol% of BPDA. For example, the diamine monomer may include 50 mol%, 51 mol%, 52 mol%, 53 mol%, 54 mol%, 55 mol%, 56 mol%, 57 mol%, 58 mol%, 59 mol%, 60 mol%, 61 mol%, 62 mol%, 63 mol%, 64 mol%, 65 mol%, 66 mol%, 67 mol%, 68 mol%, 69 mol%, 70 mol%, 71 mol%, 72 mol%, 73 mol%, 74 mol%, 75 mol%, 76 mol%, 77 mol%, 78 mol%, 79 mol%, or 80 mol% of ODA based on the total mole number of the diamine monomer, and may include 50 mol%, 49 mol%, 48 mol%, 47 mol%, 46 mol%, 45 mol%, 44 mol%, 43 mol%, 42 mol%, 41 mol%, 40 mol%, 39 mol%, 38 mol%, 37 mol%, 36 mol%, 35 mol%, 34 mol%, 33 mol%, 32 mol%, 31 mol%, 30 mol%, 29 mol%, 28 mol%, 27 mol%, 26 mol%, 25 mol%, 24 mol%, 22 mol%, 21 mol%, or 20 mol%.
According to an embodiment, the molar ratio of BPDA to MDA (BPDA: MDA) may be 0.3:1 to 2.3:1 (e.g., 0.3:1, 0.4:1, 0.5:1, 0.6:1, 0.7:1, 0.8:1, 0.9:1, 1:1, 1.1:1, 1.2:1, 1.3:1, 1.4:1, 1.5:1, 1.6:1, 1.7:1, 1.8:1, 1.9:1, 2:1, 2.1:1, 2.2:1, or 2.3:1, and further e.g., 0.3:1 to 1.75:1), in which case it may be more advantageous to provide a polyimide film that satisfies the physical properties required in the film for an optical device, such as modulus, elongation, strength, etc.
According to an embodiment, the molar ratio of PMDA to MDA (PMDA: MDA) may be 1.1:1 to 4.3:1 (e.g., 1.1:1, 1.2:1, 1.3:1, 1.4:1, 1.5:1, 1.6:1, 1.7:1, 1.8:1, 1.9:1, 2:1, 2.1:1, 2.2:1, 2.3:1, 2.4:1, 2.5:1, 2.6:1, 2.7:1, 2.8:1, 2.9:1, 3:1, 3.1:1, 3.2:1, 3.3:1, 3.4:1, 3.5:1, 3.6:1, 3.7:1, 3.9:1, 4:1, 4.1:1, 4.2:1 or 4.3:1, e.1, 2.1 to provide a more desirable optical modulus in such devices as those that provide a film, e.g., a more desirable optical property, such as a film, an elongation, a film, or the like).
According to an embodiment, the molar ratio of BPDA to ODA (BPDA: ODA) may be 0.1:1 to 0.9:1 (e.g., 0.1:1, 0.2:1, 0.3:1, 0.4:1, 0.5:1, 0.6:1, 0.7:1, 0.8:1, or 0.9:1, further, e.g., 0.3:1 to 0.9:1), in which case it can be more advantageous to provide a polyimide film satisfying the physical properties required in the film for an optical device, such as modulus, elongation, strength, and the like.
According to an embodiment, the molar ratio of PMDA to ODA (PMDA: ODA) may be 0.6:1 to 1.7:1 (e.g., 0.6:1, 0.7:1, 0.8:1, 0.9:1, 1:1, 1.1:1, 1.2:1, 1.3:1, 1.4:1, 1.5:1, 1.6:1, or 1.7:1, further e.g., 0.8:1 to 1.7:1), in which case it may be more advantageous to provide a polyimide film that meets the physical properties, e.g., modulus, elongation, strength, etc., required in the film for an optical device.
According to an embodiment, the polyamic acid may be formed by further adding the remaining one of BPDA and PMDA and the remaining one of MDA and ODA to the pre-reactant of either of BPDA and PMDA and either of MDA and ODA to extend at least a portion of the ends of the pre-reactant. In such a case, it is easy to control the number of combinations of BPDA-MDA, BPDA-ODA, PMDA-MDA and PMDA-ODA present in the polyimide film, and as a result, it is possible to provide a polyimide film that satisfies the physical properties required for the film for an optical device, such as modulus, elongation, strength, and the like, more advantageously.
The method for producing the polyimide film is not particularly limited, and a known method may be arbitrarily selected. For example, a polyimide film can be produced as follows: reacting dianhydride monomer and diamine monomer in a solvent to form a polyamic acid solution; mixing an imidizing agent and/or a dehydrating agent in a polyamic acid solution to form a precursor composition for a polyimide film; coating the precursor composition on a support and drying to form a gel film; and peeling the gel film from the support and performing heat treatment.
First, dianhydride monomer and diamine monomer may be reacted in a solvent to form a polyamic acid solution. The kinds of the dianhydride monomer and the diamine monomer can be referred to the above description.
The solvent is not particularly limited as long as it can dissolve the polyamic acid. For example, the solvent may comprise an aprotic polar solvent (aprotic polar solvent). Examples of the aprotic polar solvent include amide solvents such as N, N '-Dimethylformamide (DMF) and N, N' -dimethylacetamide (DMAc); phenol solvents such as p-chlorophenol and o-chlorophenol; n-methyl-pyrrolidone (NMP), gamma-butyrolactone (GBL), diglyme (Diglyme), and the like, which may be used singly or in combination. Depending on the case, auxiliary solvents such as toluene, tetrahydrofuran (THF), acetone, methyl Ethyl Ketone (MEK), methanol, ethanol, water, etc. may be used to adjust the solubility of the polyamic acid.
In forming the polyamic acid solution, the diamine monomer and the dianhydride monomer are added to the solvent so as to be substantially equimolar, and the term "substantially equimolar" as used herein means that the content of the dianhydride monomer is 99.8 to 100.2 mol% based on the total mole number of the diamine monomers.
According to an embodiment, the content of the polyamic acid may be 5 to 35 parts by weight based on 100 parts by weight of the polyamic acid solution. In the above range, the polyamic acid solution may have a molecular weight and a viscosity suitable for forming a film. For example, the content of the polyamic acid may be 5 to 30 parts by weight, or 15 to 20 parts by weight, based on 100 parts by weight of the polyamic acid solution, but is not limited thereto.
According to one embodiment, the polyamic acid solution was heated at 23℃for 1s -1 The viscosity at shear rates may range from 100,000cp to 500,000cp. When the amount is within the above range, the polyamic acid may have a predetermined molecular weight, and the polyimide film may be formed with excellent handleability. Here, the "viscosity" can be determined using a Harck Mars rheometer (HAAKE Mars Rheometer). For example, the viscosity of the polyamic acid solution was at 23℃for 1s -1 The shear rate may be, but not limited to, 100,000 to 450,000cP, 100,000 to 400,000cP, or 100,000 to 350,000 cP.
According to one embodiment, the weight average molecular weight of the polyamic acid may be 100,000g/mol to 500,000g/mol. In the above range, it is more advantageous to provide a polyimide film satisfying physical properties required for the film for an optical device, such as modulus, elongation, strength, and the like. Here, the "weight average molecular weight" can be measured using gel chromatography (GPC) and polystyrene as a standard sample. For example, the weight average molecular weight of the polyamic acid may be 150,000g/mol to 500,000g/mol, and may be, for example, 100,000g/mol to 400,000g/mol, but is not limited thereto.
Thereafter, the imidizing agent and/or the dehydrating agent may be mixed with the polyamic acid solution to form a precursor composition for a polyimide film.
The "dehydrating agent" is a substance that promotes a ring-closure reaction by dehydrating a polyamic acid. Examples of the dehydrating agent include aliphatic acid anhydride, aromatic acid anhydride, N' -dialkylcarbodiimide, lower aliphatic halide, halogenated lower aliphatic acid anhydride, arylphosphonic acid dihalide, thionyl halide, and the like, which may be used alone or in combination of two or more. Among them, from the viewpoint of easiness of acquisition and cost, aliphatic acid anhydrides such as acetic anhydride, propionic anhydride, and lactic anhydride can be used.
The "imidizing agent" is a substance that promotes the ring-closure reaction of the polyamic acid. Examples of the imidizing agent include aliphatic tertiary amines, aromatic tertiary amines, heterocyclic tertiary amines, and the like. Among them, from the viewpoint of reactivity as a catalyst, a heterocyclic tertiary amine may be used. Examples of the heterocyclic tertiary amine include quinoline, isoquinoline, β -picoline, pyridine, and the like, which may be used alone or in combination of two or more.
The amount of the dehydrating agent and/or the imidizing agent to be added is not particularly limited, and the dehydrating agent may be used in a ratio of 0.5 to 5 moles (for example, 1 to 4 moles) with respect to 1 mole of the amide acid groups in the polyamic acid, and the imidizing agent may be used in a ratio of 0.05 to 3 moles (for example, 0.2 to 2 moles) with respect to 1 mole of the amide acid groups in the polyamic acid. In the above range, imidization is sufficient, and casting into a film can be easily performed.
Thereafter, the precursor composition may be coated on a support and dried to form a gel film.
Here, the term "gel film" means a film which is self-supporting and is in an intermediate stage of curing from polyamic acid to polyimide.
Examples of the support include, but are not limited to, a glass plate, an aluminum foil, an endless stainless steel belt, and a stainless steel drum.
As an example of the coating method, a casting (casting) method may be mentioned, but is not limited thereto.
The drying temperature may be, for example, 40 ℃ to 300 ℃, and also, for example, 80 ℃ to 200 ℃, but is not limited thereto. The drying time may be, for example, 3 minutes to 10 minutes, and also, for example, 4 minutes to 8 minutes, but is not limited thereto.
Thereafter, the gel film may be peeled from the support and subjected to heat treatment to produce a polyimide film.
By heat treatment of the gel film, the solvent and the like remaining in the gel film can be removed, and most of the amide groups remaining can be imidized.
The heat treatment temperature may be, for example, 50 ℃ to 700 ℃, further, for example, 150 ℃ to 600 ℃, further, for example, 200 ℃ to 600 ℃, but is not limited thereto. The heat treatment time may be, for example, 5 minutes to 20 minutes, and also, for example, 7 minutes to 15 minutes, but is not limited thereto.
Optionally, a step of stretching the gel film may be further included before the heat treatment of the gel film to control the thickness and the like of the finally obtained polyimide film and to improve the orientation. Stretching may be performed in either the machine direction (machine direction, MD) or the cross direction (transverse direction, TD).
Alternatively, the polyimide film obtained after the heat treatment of the gel film may be subjected to a heat finishing process (heat finishing) at 400 to 650 ℃ for 5 to 400 seconds to further cure the polyimide film. In this case, the heat finishing process may be performed under a predetermined tension in order to reduce internal stress that may remain in the polyimide film, but the present invention is not limited thereto.
The polyimide film or the polyimide film produced by the above-described production method can satisfy physical properties required for a film for an optical device, such as modulus, elongation, strength, and the like, and thus can be suitably used for an optical device. For example, the optical device may be a display device, and the polyimide film may be used as a back sheet film, but is not limited thereto.
According to another aspect of the present invention, there is provided an optical device comprising the polyimide film described above. The optical device is a display device, and may include the polyimide film as a back sheet film.
Description of the embodiments
The present invention will be described in more detail with reference to examples. However, this is provided as a preferred example of the present invention, and the present invention is not to be construed in any sense as being limited thereby.
Examples
Examples 1 to 4 and comparative examples 1 to 4
The dianhydride monomer and the diamine monomer were mixed in Dimethylformamide (DMF) as described in Table 1 and reacted at 30℃for 2 hours to thereby produce a resin having a viscosity of 150,000cP (23℃for 1 s) -1 ) Is a polyamide acid solution. In this case, the dianhydride monomer and the diamine monomer are substantially equimolar, and the reaction conditions are controlled so that the reaction between BPDA and MDA is preferentially performed over the reaction between other monomers.
To the polyamic acid solution thus produced, acetic anhydride in a molar ratio of 3.2 and isoquinoline in a molar ratio of 1.0 were added per 1 mole of polyamic acid group, thereby obtaining a precursor composition for a polyimide film.
The above composition was cast on a SUS plate (100 SA, santvik) using a doctor blade, and dried at 110 ℃ for 4 minutes to produce a gel film.
After separating the gel film from the SUS plate, heat treatment was performed at 380 ℃ for 8 minutes, thereby producing a polyimide film having a thickness of 50 μm.
TABLE 1
Figure BDA0004234454690000101
As is clear from table 1, the polyimide films of examples 1 to 4 having a value of (a×b)/10 satisfying the scope of the present invention and an elongation of 50% or more show excellent physical properties as films for optical devices as compared with the polyimide films of comparative examples 1 to 4 which are not the same.
The present invention will be now understood mainly with reference to examples. It will be appreciated by those skilled in the art that the invention can be embodied in many different forms without departing from the essential characteristics thereof. Accordingly, the disclosed embodiments should be considered in an illustrative rather than a limiting sense. The scope of the invention is indicated in the claims rather than the foregoing description, and all differences within the scope equivalent thereto are construed as being included in the present invention.
Industrial applicability
The present invention has an effect of providing a polyimide film satisfying physical properties required for a film for an optical device, such as modulus, elongation, strength, etc., and an optical device including the same.

Claims (8)

1. A polyimide film which satisfies the following formula 1 and has a maximum elongation of 50% or more as measured according to ASTM D882:
< 1>
45≤(A×B)/10≤60
In the formula 1, the components are mixed,
a is the modulus of a polyimide film measured at a tensile speed of 200mm/min in accordance with ASTM D882, in GPa,
b is the tensile strength in MPa at 20% elongation of the polyimide film measured in accordance with ASTM D882.
2. The polyimide film of claim 1, the a being 2.5GPa to 4.5GPa.
3. The polyimide film according to claim 1, wherein B is 140MPa or more.
4. The polyimide film according to claim 1, which is derived from imidization of polyamic acid formed by the reaction of a dianhydride monomer with a diamine monomer,
the dianhydride monomer contains 55 to 85 mole percent of pyromellitic dianhydride PMDA and 15 to 45 mole percent of 3,3', 4' -biphenyl tetracarboxylic dianhydride BPDA based on the total mole number of the dianhydride monomers,
the diamine monomer comprises 50 to 80 mole percent of 4,4 '-diaminodiphenyl ether ODA and 20 to 50 mole percent of 4,4' -diaminodiphenyl methane MDA, based on the total mole number of the diamine monomer.
5. The polyimide film of claim 4, wherein the molar ratio PMDA to MDA is from 1.1:1 to 3.25:1 PMDA.
6. The polyimide film of claim 4, wherein the molar ratio of BPDA to MDA is from 0.3:1 to 1.75:1.
7. An optical device comprising the polyimide film of any one of claims 1 to 6.
8. The optical device of claim 7, which is a display device, comprising the polyimide film as a back sheet film.
CN202180077600.6A 2020-11-25 2021-11-22 Polyimide film and optical device comprising same Pending CN116438224A (en)

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