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Polyimide precursor composition, polyimide production method, polyimide, polyimide film, and substrate

A technology of polyimide precursor and polyimide, which is applied in the field of polyimide, polyimide film and substrate, can solve the problems of polyimide not having transparency, etc., and achieve excellent transparency, Low coefficient of linear thermal expansion and excellent mechanical properties

Active Publication Date: 2016-07-13
UBE IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the light transmittance at a wavelength of 400 nm of the liquid crystal display element using the polyimide film (liquid crystal aligning film) of Example 1 was 82% (polyimide film thickness: 0.1 μm), and Example 2 was used. The light transmittance of the liquid crystal display element with a polyimide film (liquid crystal alignment film) at a wavelength of 400 nm is 83% (polyimide film thickness: 0.08 μm), and this polyimide does not have sufficient transparency

Method used

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  • Polyimide precursor composition, polyimide production method, polyimide, polyimide film, and substrate
  • Polyimide precursor composition, polyimide production method, polyimide, polyimide film, and substrate
  • Polyimide precursor composition, polyimide production method, polyimide, polyimide film, and substrate

Examples

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Embodiment

[0164] Hereinafter, the present invention will be further described by way of examples and comparative examples. In addition, this invention is not limited to the following Example.

[0165] In each of the following examples, evaluation was performed by the following method.

[0166]

[0167] [preservation stability]

[0168] The varnish was stored at 23° C., and it was marked as ◯ if it was in a fluid and uniform state after 3 days, and it was marked as × if it became cloudy or gelled after 3 days.

[0169]

[0170] [400nm light transmittance, total light transmittance]

[0171] The transmittance at 400 nm and the total transmittance (average transmittance at 380 nm to 780 nm) of a polyimide film having a film thickness of about 10 μm were measured using a UV-visible spectrophotometer / V-650DS (manufactured by JASCO). Regarding the measured light transmittance and total light transmittance at 400 nm, the reflectance was set to 10%, and the light transmittance and total ...

Synthetic example 1

[0217]90.91 g (0.4 mol) of DABAN and 64.88 g (0.6 mol) of PPD were charged into the reaction vessel replaced with nitrogen, and the total mass of the input monomers (the sum of the diamine component and the carboxylic acid component) was added to 16% by mass. 2835.90 g of N-methyl-2-pyrrolidone was stirred at room temperature for 1 hour. CpODA384.38g (1.0mol) was slowly added to this solution. Stir at room temperature for 12 hours to obtain a uniform and viscous polyimide precursor solution (varnish A).

Synthetic example 2

[0219] Charge DABAN90.91g (0.4 mole), PPD54.07g (0.5 mole) and BAPB36.84g (0.1 mole) in the reaction container after replacing with nitrogen gas, add and put into monomer total mass (diamine component and carboxylic acid component The sum of ) was 2972.56 g of N-methyl-2-pyrrolidone in an amount of 16% by mass, and stirred at room temperature for 1 hour. CpODA384.38g (1.0mol) was slowly added to this solution. Stirring at room temperature for 12 hours gave a homogeneous and viscous polyimide precursor solution (varnish B).

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Abstract

The present invention pertains to a polyimide precursor composition characterized by containing a polyimide precursor and an imidazole-based compound, and further characterized in that the content of the imidazole-based compound is less than four moles with respect to one mole of repeating units of the polyimide precursor.

Description

technical field [0001] The present invention relates to a solution composition (polyimide precursor composition) containing a polyimide precursor that can obtain a polyimide having a small retardation (retardation) in the thickness direction, excellent mechanical properties, and excellent transparency. ) and a method for producing polyimide. In addition, the present invention relates to a polyimide, a polyimide film, and a substrate that are excellent in transparency, have a small retardation in the thickness direction, and are also excellent in mechanical properties. Background technique [0002] In recent years, with the advent of an advanced information society, development of optical materials such as optical fibers and optical waveguides in the field of optical communications, liquid crystal alignment films, and protective films for color filters in the field of display devices has been progressing. In particular, in the field of display devices, research on lightweigh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08C08G73/10C08J5/18C08K5/3445
CPCC08G73/1082C08G73/14C08J5/18C08J2379/08C08K5/3445C08L79/08C08G73/10C08G73/1028C08L2201/10C08L2203/20
Inventor 冈卓也小滨幸德久野信治
Owner UBE IND LTD
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