Transparent polyimide laminate and manufacturing method therefor

A transparent polyimide and polyimide layer technology, applied in chemical instruments and methods, layered products, synthetic resin layered products, etc., can solve the problem of low light transmittance and difficult application of polyimide film Flexible display panel substrates and other issues, achieve the effects of small in-plane retardation, easy peeling, and high light transmittance

Active Publication Date: 2015-04-29
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the light transmittance of the polyimide film obtained by the above-mentioned techniques of Patent Doc

Method used

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  • Transparent polyimide laminate and manufacturing method therefor
  • Transparent polyimide laminate and manufacturing method therefor
  • Transparent polyimide laminate and manufacturing method therefor

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0145] 3-5. Preparation method of solution containing polyimide precursor

[0146] The solution containing the polyimide precursor is obtained by reacting the tetracarboxylic acid component (A) and the diamine component (B) in the solvent. When the number of moles of the diamine component (B) in the solvent is set to x and the number of moles of the tetracarboxylic acid component (A) is set to y, y / x is preferably 0.9 to 1.1, more preferably 0.95 to 1.05 It is more preferably 0.97 to 1.03, and particularly preferably 0.99 to 1.01. By polymerizing the tetracarboxylic acid component (A) and the diamine component (B) at such a ratio, the molecular weight (polymerization degree) of the polyimide precursor can be appropriately adjusted.

[0147] The order of the polymerization reaction is not particularly limited. For example, first prepare a container equipped with a stirrer and a nitrogen introduction pipe. The below-mentioned solvent is put into a nitrogen-substituted container, t...

Example Embodiment

[0174] Example

[0175] Hereinafter, the present invention will be explained in more detail through examples. However, the scope of the present invention is not limited at all by these examples. In the examples and comparative examples, the following methods were used to measure the peel strength, imidization rate, residual solvent amount, glass transition temperature, total light transmittance, haze, L*a*b color system b value, in-plane retardation and ten-point average roughness of the supporting substrate.

[0176] 1) Peel strength

[0177] The transparent polyimide laminate produced in the Examples and Comparative Examples was cut out to a length of 50 mm and a width of 3.5 mm. The peel strength of this transparent polyimide laminate was measured in accordance with the method specified in JIS C-6471. Specifically, the short-side end of the transparent polyimide laminate was held and peeled from the supporting substrate under the conditions of a peeling angle of 90° and a peel...

Example Embodiment

[0206] (Synthesis example 1)

[0207] In a 300 mL five-neck separable flask equipped with a thermometer, a stirrer, and a nitrogen introduction tube, 469.4 g (3.3 mol) of 14BAC and 5761 g of DMAc were added and stirred. 970.9 g (3.3 mol) of powdered BPDA was added to this mixed liquid. After adding BPDA, the reaction vessel was placed in an oil bath kept at 120°C for 5 minutes. The salt precipitated out about 3 minutes after the addition of BPDA, but it quickly dissolved afterwards. This mixed solution was further stirred at room temperature for 18 hours to obtain a polyimide precursor-containing solution.

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Abstract

The present invention addresses the problem of providing a transparent polyimide laminate having a transparent polyimide layer that has high light transmissivity and little in-plane phase difference, and that can also be easily separated from a support substrate. In order to solve the above problem, the present invention provides a manufacturing method for a transparent polyimide laminate including a support substrate and a transparent polyimide layer laminated upon the support substrate, said manufacturing method comprising: a) a step for coating, upon the support substrate, a solution containing a polyimide precursor, which includes a solvent and a polyimide precursor obtained by reacting a tetracarboxylic acid component and a diamine component; and b) a step for heating a polyimide precursor film formed from coating the solution containing the polyimide precursor to at least the glass transition temperature of the transparent polyimide layer. The transparent polyimide layer has a glass transition temperature of 260°C or more, a total light transmittance of 80% or more, a haze of 5% or less, an absolute value for the b value of an L*a*b color system of 5 or less, and an in-plane phase difference of 10 nm or less. The peel strength when separating the transparent polyimide layer from the support substrate is 0.005 to 0.20 kN/m.

Description

technical field [0001] The present invention relates to a transparent polyimide laminated body and its manufacturing method. Background technique [0002] Polyimide resins have excellent heat resistance and mechanical properties, and polyimide films are used as substrates of various flexible printed wiring boards, etc. One of the production methods of the polyimide film is a casting method. The casting method is a method of (i) coating a polyimide precursor on a support substrate, (ii) imidizing the polyimide precursor by heat treatment, (iii) peeling the polyimide precursor from the support substrate Polyimide film, to obtain a polyimide film. The support substrate is usually a glass substrate, but it has also been proposed to set the support substrate to a metal plate, a non-thermoplastic resin, or the like (Patent Document 1 to Patent Document 3). [0003] Conventionally, in displays such as liquid crystal display elements and organic EL display elements, inorganic gla...

Claims

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Application Information

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IPC IPC(8): B32B27/34C08G73/10
CPCC08G73/10C08J5/18C08J2379/08B32B27/281
Inventor 坂田佳广福川健一冈崎真喜浦上达宣大久保敦
Owner MITSUI CHEM INC
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