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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 Document 1 to Patent Document 3 is low, and it is difficult to apply it to a panel substrate of a flexible display.

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
Effect test

preparation example Construction

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

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

[0147] The order of polymerization reactions is not particularly limited. For example, first, a container equipped with a stirrer and a nitrogen gas introduction tube is prepared. The solvent mentioned later was injected|thrown-in in the container which replac...

Embodiment

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

[0176] 1) Peel strength

[0177] The transparent polyimide laminated body produced in the Example and the comparative example was cut out to length 50mm, and width 3.5mm. The peel strength of this transparent polyimide laminate was measured according to the method prescribed|regulated by JIS C-6471. Specifically, the short edge of the transparent polyimide laminate was held, and peeled from the support base material at a peeling angle of 90° and a peeling speed of 50 mm / m...

Synthetic example 1

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

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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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