Polyimide precursor solution
A technology of polyimide precursor and polyamic acid, applied in the direction of coating, etc., can solve the problem that it is difficult to obtain polyimide precursor with high degree of polymerization, and achieve easy process control, excellent environmental suitability, flow good flat effect
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Embodiment 1
[0064] Put the mixture of polyamic acid powder A and 1,2-dimethylimidazole (pKa7.7) (2.5 moles of 1,2-dimethylimidazole relative to 1 mole of structural units of polyamic acid) at 25°C It was dissolved in ethylene glycol to obtain a polyimide precursor solution A-1 having a concentration of 15% by mass as a polyimide precursor. Table 1 shows the evaluation results of the properties of the precursor solution.
Embodiment 2
[0066] The mixture of polyamic acid powder B and 1,2-dimethylimidazole (pKa7.7) (1,2-dimethylimidazole relative to the structural unit of polyamic acid 1 mole, use 2.5 moles) at 25 ° C It was dissolved in ethylene glycol to obtain a polyimide precursor solution B-1 having a concentration of 15% by mass as a polyimide precursor. Table 1 shows the evaluation results of the properties of the precursor solution.
Embodiment 3
[0068] Except having used 2-ethyl-4-methylimidazole (pKa8.3) as a basic compound, it carried out similarly to Example 2, and obtained polyimide precursor solution B-2. Table 1 shows the evaluation results of the properties of the precursor solution.
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