WO2014199965A1 - ディスプレイ基板用樹脂組成物、ディスプレイ基板用樹脂薄膜及びディスプレイ基板用樹脂薄膜の製造方法 - Google Patents
ディスプレイ基板用樹脂組成物、ディスプレイ基板用樹脂薄膜及びディスプレイ基板用樹脂薄膜の製造方法 Download PDFInfo
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- WO2014199965A1 WO2014199965A1 PCT/JP2014/065289 JP2014065289W WO2014199965A1 WO 2014199965 A1 WO2014199965 A1 WO 2014199965A1 JP 2014065289 W JP2014065289 W JP 2014065289W WO 2014199965 A1 WO2014199965 A1 WO 2014199965A1
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- thin film
- resin composition
- display substrate
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- resin
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- 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
Definitions
- the present invention relates to a resin composition for display substrate, a resin thin film for display substrate, and a method for producing a resin thin film for display substrate.
- a high-definition display uses an active matrix drive panel, and high-temperature processing of about 300 to 500 ° C. is required to form an active matrix layer including thin film active elements in addition to matrix-like pixel electrodes. In addition, accurate alignment is also required.
- polyimide is inferior to glass in terms of linear expansion coefficient characteristics, it contracts or expands more than a glass substrate at high temperatures. Therefore, when polyimide is used as a substrate material, it has high dimensional stability in the display manufacturing process. It is often difficult to maintain. Therefore, in order to realize suitable linear expansion coefficient characteristics while utilizing the heat resistance of polyimide, an appropriate molecular design is required.
- a polyimide composed of a highly rigid acid dianhydride and a diamine has been proposed as a polyimide exhibiting low linear expansion, but it has high linear expansion in a high temperature region (300 to 500 ° C.) near the glass transition temperature of the polymer. If the rigidity of the polymer skeleton is too high, there are many problems such as damage to the strength and flexibility of the film (Patent Document 1, Non-Patent Document 1), and those that sufficiently satisfy advanced requirements are still unknown. It is not done.
- the present invention has been made in view of such circumstances, and a resin composition for a display substrate capable of forming a resin thin film for a display device substrate having high heat resistance, an appropriate linear expansion coefficient, and high tensile strength.
- the purpose is to provide goods.
- the present invention is mainly composed of a general-purpose acid dianhydride and a diamine, heat resistance that can withstand a display manufacturing process, appropriate flexibility, and appropriate linear expansion coefficient, particularly around 400 to 500 ° C. It aims at providing the resin composition for display substrates which can form the resin thin film which has a moderate linear expansion coefficient in.
- the moderate flexibility as used herein refers to such a high flexibility that the resin thin film has a self-supporting property and does not crack even when bent at an angle of 90 degrees or an angle close thereto.
- Ar 1 represents a divalent group of the following formula (2)
- Ar 2 represents a divalent group of the following formula (3)
- Ar 3 represents a tetravalent group of the following formula (4)
- the polyamic acid preferably contains at least 80 mol% of structural units represented by the formula (1-1) and the formula (1-2).
- the resin composition for a display substrate may be dissolved in a solvent.
- ⁇ 5> A display substrate resin thin film produced using the display substrate resin composition according to any one of ⁇ 1> to ⁇ 4>.
- ⁇ 6> An image display device comprising the display substrate resin thin film according to ⁇ 5>.
- a method for producing a resin thin film for a display substrate comprising using the resin composition for a display substrate according to any one of ⁇ 1> to ⁇ 4>.
- the method for producing a resin thin film for a display substrate includes a step of applying the resin composition for a display substrate to a substrate and heating.
- a method for producing an image display device comprising using the resin thin film for a display substrate according to ⁇ 5>.
- the resin composition for a display substrate of the present invention can be produced using a versatile acid dianhydride and a versatile diamine as main components. By using this, a high heat resistance and a moderate amount can be obtained by a wet process. It is possible to obtain a resin thin film having a large area and good reproducibility that has a good flexibility and an appropriate linear expansion coefficient, particularly an appropriate linear expansion coefficient in the vicinity of 400 to 500 ° C. Therefore, by using the resin composition for a display substrate of the present invention, it is possible not only to reduce the weight and size of the display but also to reduce the cost of the display by reducing raw material costs and improving manufacturing efficiency. Become.
- the resin composition for display substrate of the present invention comprises a polyamic acid containing at least 50 mol% of the structural units represented by the formulas (1-1) and (1-2). And the polyamic acid whose weight average molecular weight is 5000 or more is included.
- Ar 1 represents a divalent group represented by the formula (2)
- Ar 2 represents a formula (3)
- Ar 3 represents a tetravalent group represented by the formula (4).
- the lower limit value of the numerical range of n 1 / n 2 is preferably 2.1, and more preferably 3.2.
- the upper limit of the numerical range of n 1 / n 2 is preferably 7.5, more preferably 6.8, even more preferably 6.0, and still more preferably 5.1.
- n 1 / n 2 preferably satisfies 2.1 to 7.5, It is more preferable to satisfy 2.1 to 6.8, even more preferable to satisfy 3.2 to 6.0, and even more preferable to satisfy 3.2 to 5.1.
- the polyamic acid used in the present invention contains at least 50 mol%, preferably at least 60 mol%, more preferably at least 70 mol%, of repeating units represented by formulas (1-1) and (1-2). More preferably, it contains at least 80 mol%, more preferably at least 90 mol%.
- polyamic acid in such an amount, a resin thin film having characteristics suitable for a display substrate can be obtained with good reproducibility.
- the polyamic acid is a copolymer comprising only the repeating units represented by the formulas (1-1) and (1-2), that is, these repeating units are contained in 100 mol%. It is a polymer.
- the weight average molecular weight of the polyamic acid used in the present invention needs to be 5000 or more, preferably 10,000 or more, more preferably 20,000 or more, and still more preferably 30,000 or more.
- the upper limit of the weight average molecular weight of the polyamic acid used in the present invention is usually 2,000,000 or less, it is possible to prevent the viscosity of the resin composition (varnish) from becoming excessively high or to be flexible. In consideration of obtaining a high resin thin film with good reproducibility, etc., it is preferably 1,000,000 or less, more preferably 200,000 or less.
- the polyamic acid used in the present invention may contain other structural units (repeating units) in addition to the structural units represented by the formulas (1-1) and (1-2).
- the content of such other structural units needs to be less than 50 mol%, preferably less than 40 mol%, more preferably less than 30 mol%, and less than 20 mol%. Is more preferable, and it is further more preferable that it is less than 10 mol%.
- Such other structural units include o-phenylenediamine, m-phenylenediamine, p-phenylenediamine, 2-methyl-1,4-phenylenediamine, 5-methyl-1,3-phenylenediamine, and 4-methyl.
- the polyamic acid used in the present invention includes pyromellitic anhydride (PMDA) (formula (5)) as an acid dianhydride, p-phenylenediamine (pPDA) (formula (6)) and 4, It can be obtained by reacting with 4 ′′ -diamino-p-terphenyl (TPDA) (formula (7)).
- PMDA pyromellitic anhydride
- pPDA p-phenylenediamine
- TPDA 4 ′′ -diamino-p-terphenyl
- the charging ratio (molar ratio) of pyromellitic anhydride (PMDA), diamine consisting of p-phenylenediamine (pPDA) and 4,4 ′′ -diamino-p-terphenyl (TPDA) is desired.
- PMDA pyromellitic anhydride
- pPDA p-phenylenediamine
- TPDA 4,4 ′′ -diamino-p-terphenyl
- the charge ratio of pPDA and TPDA which is a diamine
- the substance amount (m 1 ) of pPDA is usually about 1.7 to 8.2 when the substance amount (m 2 ) of TPDA is 1.
- it is preferably 2.1 to 7.5, more preferably 2.1 to 6.8, even more preferably 3.2 to 6.0, and even more preferably 3.2 to 5.1.
- the above reaction is preferably carried out in a solvent.
- a solvent various solvents can be used as long as they do not adversely affect the reaction. Specific examples include m-cresol, 2-pyrrolidone, N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone, N-vinyl-2-pyrrolidone, N, N-dimethylacetamide, N, N-dimethylformamide.
- the reaction temperature may be appropriately set in the range from the melting point to the boiling point of the solvent to be used, and is usually about 0 to 100 ° C. However, it prevents imidation of the resulting polyamic acid and maintains a high content of polyamic acid units. Therefore, it is preferably about 0 to 70 ° C, more preferably about 0 to 60 ° C, and still more preferably about 0 to 50 ° C.
- the reaction time depends on the reaction temperature and the reactivity of the raw material, it cannot be defined unconditionally, but is usually about 1 to 100 hours.
- a target reaction solution containing polyamic acid can be obtained.
- the filtrate is used as it is, or diluted or concentrated, and used as a resin composition (varnish) for a display substrate.
- a resin composition varnish
- the solvent used for dilution and concentration is not particularly limited, and examples thereof include those similar to the specific examples of the reaction solvent in the above reaction, and these may be used alone or in combination of two or more. .
- the solvents used are N, N-dimethylformamide, N, N-dimethylacetamide, N-methyl-2-pyrrolidone, 1,3 -Dimethyl-2-imidazolidinone, N-ethyl-2-pyrrolidone and ⁇ -butyrolactone are preferred.
- a varnish obtained by dissolving or dispersing the isolated polyamic acid in a solvent is used as a resin composition for a display substrate. You may use as a thing. In this case, considering that a thin film having high flatness can be obtained with good reproducibility, it is preferable that the polyamic acid is dissolved in a solvent.
- the solvent used for dissolution and dispersion is not particularly limited, and examples thereof include the same specific examples of the reaction solvent for the above reaction, and these may be used alone or in combination of two or more. .
- the concentration of the polyamic acid with respect to the total mass of the varnish is appropriately set in consideration of the thickness of the thin film to be produced, the varnish viscosity, etc., but is usually about 0.5 to 30% by mass, preferably about 5 to 25% by mass. is there.
- the viscosity of the varnish is appropriately set in consideration of the thickness of the thin film to be produced.
- it is usually at 25 ° C. It is about 500 to 50,000 mPa ⁇ s, preferably about 1,000 to 20,000 mPa ⁇ s.
- the viscosity of the varnish can be measured using a commercially available liquid viscosity measurement viscometer, for example, with reference to the procedure described in JIS K7117-2, at a varnish temperature of 25 ° C. .
- a conical plate type (cone plate type) rotational viscometer is used, and preferably a 1 ° 34 ′ ⁇ R24 is used as a standard cone rotor in the same type viscometer, and the varnish temperature is 25 ° C. It can be measured under conditions.
- An example of such a rotational viscometer is TVE-25H manufactured by Toki Sangyo Co., Ltd.
- the substrate for example, plastic (polycarbonate, polymethacrylate, polystyrene, polyester, polyolefin, epoxy, melamine, triacetylcellulose, ABS, AS, norbornene resin, etc.), metal (silicon wafer, etc.), wood, Examples include paper, glass, and slate.
- the coating method is not particularly limited, but for example, cast coating method, spin coating method, blade coating method, dip coating method, roll coating method, bar coating method, die coating method, ink jet method, printing method (letter plate) , Intaglio, lithographic, screen printing, etc.).
- thermo imidization in which the resin composition coated on the substrate is heated as it is, and a catalyst is added to the resin composition. Heating catalytic imidization is mentioned.
- a catalyst is added to the resin composition of the present invention, the catalyst-added resin composition is adjusted by stirring, and then applied to a substrate and heated to obtain a resin thin film.
- the amount of the catalyst is 0.1 to 30 mol times, preferably 1 to 20 mol times of the amic acid group.
- acetic anhydride and the like can be added as a dehydrating agent to the catalyst-added resin composition, and the amount thereof is 1 to 50 mol times, preferably 3 to 30 mol times the amic acid group.
- a tertiary amine is preferably used as the imidization catalyst.
- pyridine substituted pyridines, imidazole, substituted imidazoles, picoline, quinoline, isoquinoline and the like are preferable.
- the heating temperature during thermal imidization and catalyst imidation is preferably 450 ° C. or lower. If it exceeds 450 ° C., the resulting resin thin film becomes brittle, and a resin thin film suitable for display substrate use may not be obtained. Further, considering the heat resistance and linear expansion coefficient characteristics of the resin thin film obtained, the applied resin composition is heated at 50 ° C. to 100 ° C. for 5 minutes to 2 hours, and then the heating temperature is gradually increased as it is. In particular, it is desirable to heat at over 375 ° C. to 450 ° C. for 30 minutes to 4 hours. In particular, the applied resin composition is heated at 50 ° C. to 100 ° C. for 5 minutes to 2 hours, then over 100 ° C. to 200 ° C.
- Heating is preferably performed for a period of time, and finally from 375 ° C. to 450 ° C. for 30 minutes to 4 hours.
- the appliance used for heating include a hot plate and an oven.
- the heating atmosphere may be under air or under an inert gas, and may be under normal pressure or under reduced pressure.
- the thickness of the resin thin film is usually about 1 to 60 ⁇ m, preferably about 5 to 50 ⁇ m, particularly when used as a substrate for a flexible display.
- the thickness of the coating film before heating is adjusted to obtain a resin having a desired thickness. A thin film is formed.
- the resin thin film described above satisfies the various conditions necessary for a base film of a flexible display substrate, and is optimal for use as a base film of a flexible display substrate.
- the weight molecular weight (Mw) and molecular weight distribution were measured using a GPC apparatus manufactured by JASCO Corporation (column: OHpak SB803-HQ and OHpak SB804-HQ manufactured by Shodex; eluent: dimethylformamide / LiBr ⁇ H 2 O (29 .6 mM) / H 3 PO 4 (29.6 mM) / THF (0.1 wt%); flow rate: 1.0 mL / min; column temperature: 40 ° C .; Mw: standard polystyrene conversion value) The same applies to the examples and comparative examples.
- the viscosity of the varnish solution was measured using a cone plate type rotational viscometer TVE-25H manufactured by Toki Sangyo Co., Ltd. (varnish temperature 25 ° C.).
- Example 2 After dissolving 0.799 g (0.00739 mol) of pPDA and 0.313 g (0.00120 mol) of TPDA in 22.05 g of NMP, and adding 1.837 g (0.00842 mol) of PMDA, The reaction was carried out at 24 ° C. for 24 hours. Mw of the obtained polymer was 86,600, and molecular weight distribution was 9.4. This solution was used as a resin composition for display substrates.
- Example 3 After dissolving 0.724 g (0.00670 mol) of pPDA and 0.436 g (0.00167 mol) of TPDA in 22.05 g of NMP, and adding 1.790 g (0.00821 mol) of PMDA, The reaction was carried out at 24 ° C. for 24 hours. Mw of the obtained polymer was 82,600 and molecular weight distribution was 9.7. This solution was used as a resin composition for display substrates.
- Example 4 After dissolving 0.665 g (0.00615 mol) of pPDA and 0.533 g (0.00205 mol) of TPDA in 22.05 g of NMP, and adding 1.752 g (0.00803 mol) of PMDA, The reaction was carried out at 24 ° C. for 24 hours. Mw of the obtained polymer was 93,300 and molecular weight distribution was 8.7. This solution was used as a resin composition for display substrates.
- Table 1 summarizes the composition ratio and physical properties of the resin compositions for display substrates of the above Examples and Comparative Examples.
- the film thickness of the resin thin film was measured using a micrometer manufactured by Mitutoyo Corporation.
- the linear expansion coefficient of the resin thin film was measured using TMA-60 manufactured by Shimadzu Corporation (temperature increase rate: from 50 ° C. to 560 ° C. at 5 ° C./min) (test piece: width 4 mm, length 12 mm). , Load: 3.0 g).
- the linear expansion coefficient indicated an average value in each temperature region of 100 ° C. to 400 ° C. and 400 ° C. to 500 ° C.
- ⁇ Tensile test> The tensile strength of the resin thin film was measured. The measurement was carried out using an AUTOGRAPH / AGS-X manufactured by Shimadzu Corporation at room temperature (25 ⁇ 2 ° C.) (test piece size: 50 mm ⁇ 10 mm ⁇ 0.013-0.016 mm, chuck interval) : 20 mm, tensile speed: 5 mm / min). In addition, each value in a result showed the average value of four measurements.
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Abstract
Description
しかしながら、ポリイミドをディスプレイ基板の材料として用いるには、ガラスの線膨張係数(約3~8ppm/K程度)に近い値が必要となるが、大半のポリイミドは60~80ppm/K程度の線膨張係数を有するため、ディスプレイの基板材料に適さない。
それゆえ、ポリイミドの耐熱性を活かしつつ、好適な線膨張係数特性を実現するためには、適切な分子設計が必要となる。
なお、ここでいう適度な柔軟性とは、樹脂薄膜が、自己支持性があって、かつ、90度若しくはそれに近い角度に曲げても割れない程度の高い柔軟性をいう。
<1> 下記の式(1-1)及び式(1-2)で表される構造単位を少なくとも50モル%含有するポリアミック酸であって、重量平均分子量が5000以上であるポリアミック酸を含む、ディスプレイ基板用樹脂組成物。
[式中、
Ar1は、下記式(2)の2価の基を表し、
Ar2は、下記式(3)の2価の基を表し、
Ar3は、下記式(4)の4価の基を表し、かつ
n1、n2は、各繰り返し単位の数を示し、n1/n2=1.7~8.2の条件を満たす]。
<3> 前記<1>または<2>において、前記ポリアミック酸が、式(1-1)及び式(1-2)で表される構造単位を少なくとも80モル%含有するのがよい。
<6> 前記<5>のディスプレイ基板用樹脂薄膜を備える、画像表示装置。
<8> 前記<5>のディスプレイ基板用樹脂薄膜を用いることを特徴とする、画像表示装置の製造方法。
それゆえ、本発明のディスプレイ基板用樹脂組成物を用いることで、ディスプレイの軽量化やコンパクト化だけでなく、原材料費の低減や製造効率の向上によるディスプレイの低価格化等も図ることが可能となる。
本発明のディスプレイ基板用樹脂組成物は、前記したように、式(1-1)及び式(1-2)で表される構造単位を少なくとも50モル%含有するポリアミック酸であって、その重量平均分子量が5000以上であるポリアミック酸を含むものである。
得ることができる。
具体例としては、m-クレゾール、2-ピロリドン、N-メチル-2-ピロリドン、N-エチル-2-ピロリドン、N-ビニル-2-ピロリドン、N,N-ジメチルアセトアミド、N,N-ジメチルホルムアミド、3-メトキシ-N,N-ジメチルプロピルアミド、3-エトキシ-N,N-ジメチルプロピルアミド、3-プロポキシ-N,N-ジメチルプロピルアミド、3-イソプロポキシ-N,N-ジメチルプロピルアミド、3-ブトキシ-N,N-ジメチルプロピルアミド、3-sec-ブトキシ-N,N-ジメチルプロピルアミド、3-tert-ブトキシ-N,N-ジメチルプロピルアミド、γ-ブチロラクトン等のプロトン性溶剤等が挙げられる。これらは単独で又は2種以上を組み合わせて使用してもよい。
反応時間は、反応温度や原料物質の反応性に依存するため一概に規定できないが、通常1~100時間程度である。
希釈や濃縮に用いる溶媒は、特に限定されるものではなく、例えば、上記反応の反応溶媒の具体例と同様のものが挙げられ、それらは単独で又は2種以上を組み合わせて使用してもよい。
ここで、ワニスの粘度は、市販の液体の粘度測定用粘度計を使用して、例えば、JIS K7117-2に記載の手順を参照して、ワニス温度25℃の条件にて測定することができる。好ましくは、粘度計としては、円錐平板型(コーンプレート型)回転粘度計を使用し、好ましくは同型の粘度計で標準コーンロータとして1°34‘×R24を使用して、ワニス温度25℃の条件にて測定することができる。このような回転粘度計としては、例えば、東機産業株式会社製TVE-25Hが挙げられる。
また、得られる樹脂薄膜の耐熱性と線膨張係数特性を考慮すると、塗布した樹脂組成物を50℃~100℃で5分間~2時間加熱した後に、そのまま段階的に加熱温度を上昇させて最終的に375℃超~450℃で30分~4時間加熱することが望ましい。
特に、塗布した樹脂組成物は、50℃~100℃で5分間~2時間加熱した後に、100℃超~200℃で5分間~2時間、次いで、200℃超~375℃で5分間~2時間、最後に375℃超~450℃で30分~4時間加熱することが好ましい。
加熱に用いる器具は、例えばホットプレート、オーブン等が挙げられる。加熱雰囲気は、空気下であっても不活性ガス下であってもよく、また、常圧下であっても減圧下であってもよい。
本実施例で使用する略号は以下のとおりである。
<無水物>
PMDA: ピロメリット酸無水物
<アミン>
pPDA: p-フェニレンジアミン
TPDA: 4,4”-ジアミノ-p-ターフェニル
<溶剤>
NMP: N-メチル-2-ピロリドン
<実施例1>
pPDA 0.825g(0.00763モル)とTPDA 0.271g(0.00104モル)をNMP 22.05gに溶解し、PMDA 1.854g(0.00850モル)を添加した後、窒素雰囲気下、23℃で24時間反応させた。
得られたポリマーの重量平均分子量(Mw)は89,000、分子量分布(Mw/Mn)は9.3であった。この溶液をディスプレイ基板用樹脂組成物とした。
また、ワニス溶液の粘度は、東機産業株式会社製コーンプレート型回転粘度計TVE-25Hを用いて測定した(ワニス温度25℃)。
pPDA 0.799g(0.00739モル)とTPDA 0.313g(0.00120モル)をNMP 22.05gに溶解し、PMDA 1.837g(0.00842モル)を添加した後、窒素雰囲気下、23℃で24時間反応させた。
得られたポリマーのMwは86,600、分子量分布は9.4であった。この溶液をディスプレイ基板用樹脂組成物とした。
pPDA 0.724g(0.00670モル)とTPDA 0.436g(0.00167モル)をNMP 22.05gに溶解し、PMDA 1.790g(0.00821モル)を添加した後、窒素雰囲気下、23℃で24時間反応させた。
得られたポリマーのMwは82,600、分子量分布は9.7であった。この溶液をディスプレイ基板用樹脂組成物とした。
pPDA 0.665g(0.00615モル)とTPDA 0.533g(0.00205モル)をNMP 22.05gに溶解し、PMDA 1.752g(0.00803モル)を添加した後、窒素雰囲気下、23℃で24時間反応させた。
得られたポリマーのMwは93,300、分子量分布は8.7であった。この溶液をディスプレイ基板用樹脂組成物とした。
pPDA 0.608g(0.00562モル)とTPDA 0.627g(0.00241モル)をNMP 22.05gに溶解し、PMDA 1.716g(0.00787モル)を添加した後、窒素雰囲気下、23℃で24時間反応させた。
得られたポリマーのMwは85,700、分子量分布は9.6であった。この溶液をディスプレイ基板用樹脂組成物とした。
pPDA 0.553g(0.00511モル)とTPDA 0.716g(0.00275モル)をNMP 22.05gに溶解し、PMDA 1.681g(0.00771モル)を添加した後、窒素雰囲気下、23℃で24時間反応させた。
得られたポリマーのMwは91,100、分子量分布は9.5であった。この溶液をディスプレイ基板用樹脂組成物とした。
pPDA 0.852g(0.00788モル)とTPDA 0.228g(0.00088モル)をNMP 22.05gに溶解し、PMDA 1.871g(0.00858モル)を添加した後、窒素雰囲気下、23℃で24時間反応させた。
得られたポリマーのMwは92,100、分子量分布は9.7であった。この溶液をディスプレイ基板用樹脂組成物とした。
pPDA 0.500g(0.00462モル)とTPDA 0.803g(0.00308モル)をNMP 22.05gに溶解し、PMDA 1.647g(0.00755モル)を添加した後、窒素雰囲気下、23℃で24時間反応させた。
得られたポリマーのMwは112,000、分子量分布は9.1であった。この溶液をディスプレイ基板用樹脂組成物とした。
pPDA 0.991g(0.00916モル)をNMP 22.05gに溶解し、PMDA 1.959g(0.00898モル)を添加した後、窒素雰囲気下、23℃で24時間反応させた。
得られたポリマーのMwは79,100、分子量分布は9.9であった。この溶液をディスプレイ基板用樹脂組成物とした。
<樹脂薄膜1(実施例)>
実施例1で得られたディスプレイ基板用樹脂組成物をワニスとして使用し、塗布厚300μmのドクターブレードを用いてシリコンウエハ基板上に塗布し、空気下、90℃で、20分間ベークした後、窒素雰囲気下にて、オーブン内で120℃、30分間、続いて180℃、20分間、続いて240℃、20分間、続いて300℃、20分間、続いて400℃、20分間、続いて450℃、60分間、ベークを行って樹脂薄膜を作製した。
実施例1で得られたディスプレイ基板用樹脂組成物の代わりに、それぞれ樹脂薄膜2~6(実施例)及び比較例1~3で得られたディスプレイ基板用樹脂組成物をワニスとして用いた以外は、樹脂薄膜1と同様の方法によって、各樹脂薄膜を作製した。
得られた樹脂薄膜の評価を、以下の方法に従って行った。なお、薄膜は、各評価試験のためにそれぞれ作製した。
樹脂薄膜の膜厚を、株式会社ミツトヨ製マイクロメータを用いて測定した。
樹脂被膜の耐熱性評価のために、樹脂薄膜の1%質量減少温度(Td1%(℃))と5%質量減少温度(Td5%(℃))を測定した。測定は、ブルカー・エイエックスエス株式会社製TG/DTA2000SAを用いて行った(昇温レート:毎分10℃で50℃から800℃まで)。
樹脂薄膜の線膨張係数の測定は、株式会社島津製作所製TMA-60(昇温レート:毎分5℃で50℃から560℃まで)を用いて測定した(試験片:幅4mm、長さ12mm、荷重:3.0g)。なお、線膨張係数は、100℃~400℃と400℃~500℃の各温度領域での平均値を示した。
樹脂薄膜の引張強度を測定した。測定は、株式会社島津製作所製AUTOGRAPH/AGS-Xを用いて、室温下(25±2℃)で引張試験を行った(試験片サイズ:50mm×10mm×0.013-0.016mm、チャック間隔:20mm、引張速度:5mm/min)。なお、結果における各値は、測定4回の平均値を示した。
Claims (8)
- 前記式(1-1)及び式(1-2)において、n1およびn2が、n1/n2=1.5~6.0の条件を満たす、請求項1に記載のディスプレイ基板用樹脂組成物。
- 前記ポリアミック酸が、式(1-1)及び式(1-2)で表される構造単位を少なくとも80モル%含有する、請求項1または2に記載のディスプレイ基板用樹脂組成物。
- 溶剤に溶解されてなる、請求項1~3のいずれか一項に記載のディスプレイ基板用樹脂組成物。
- 請求項1~4のいずれか一項に記載のディスプレイ基板用樹脂組成物を用いて作製される、ディスプレイ基板用樹脂薄膜。
- 請求項5に記載のディスプレイ基板用樹脂薄膜を備える、画像表示装置。
- 請求項1~4のいずれか一項に記載のディスプレイ基板用樹脂組成物を用いることを特徴とする、ディスプレイ基板用樹脂薄膜の製造方法。
- 請求項5に記載のディスプレイ基板用樹脂薄膜を用いることを特徴とする、画像表示装置の製造方法。
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CN108026274A (zh) * | 2015-09-18 | 2018-05-11 | 日产化学工业株式会社 | 聚苯并噁唑及其利用 |
WO2023100951A1 (ja) * | 2021-11-30 | 2023-06-08 | Ube株式会社 | ポリイミドフィルム、高周波回路基板、フレキシブル電子デバイス基板 |
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