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

Active Publication Date: 2016-01-06

UNITIKA LTD

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AI-Extracted Technical Summary

Problems solved by technology

However, if an alcohol mixed with a strong basic compound such as triethylamine or triethylenediamine is used as a polymerization solvent...

Abstract

The purpose of the invention is to provide a polyimide precursor solution having excellent environmental compatibility and good storage stability and leveling properties, the polyimide precursor solution making it possible to produce a polyimide molded article having excellent mechanical strength. The invention provides a polyimide precursor solution obtained by dissolving polyamic acid and a salt of a weakly basic compound having an acid dissociation constant (pKa) of 4.5-8.5 in a solvent containing a polyhydric alcohol.

Application Domain

Coatings

Technology Topic

Acid dissociation constantAlcohol +5

Image

Examples

Experimental program(10)
Comparison scheme(7)

Example Embodiment

[0063] [Example 1]

[0064] A mixture of polyamic acid powder A and 1,2-dimethylimidazole (pKa7.7) (2.5 mol of 1,2-dimethylimidazole is used with respect to 1 mol of the structural unit 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 characteristics evaluation results of the precursor solution.

Example Embodiment

[0065] [Example 2]

[0066] A mixture of polyamic acid powder B and 1,2-dimethylimidazole (pKa7.7) (2.5 mol of 1,2-dimethylimidazole is used with respect to 1 mol of the structural unit of polyamic acid) 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 characteristics evaluation results of the precursor solution.

Example Embodiment

[0067] [Example 3]

[0068] As a basic compound, except having used 2-ethyl-4-methylimidazole (pKa8.3), it carried out similarly to Example 2, and obtained the polyimide precursor solution B-2. Table 1 shows the characteristics evaluation results of the precursor solution.

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Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Good leveling

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

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

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Description & Claims & Application Information

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