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
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[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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