Aqueous polyimide precursor solution composition and method for producing aqueous polyimide precursor solution

Abstract

An aqueous polyimide precursor solution composition in which a polyamic acid which is obtained by reacting a tetracarboxylic acid component and a diamine component is dissolved in an aqueous solvent together with an imidazole in an amount of 1.6 moles or more per mole of the tetracarboxylic acid component of the polyamic acid.

Description

TECHNICAL FIELD

[0001] The present invention relates to an aqueous polyimide precursor solution composition and a method for easily producing an aqueous polyimide precursor solution composition. The aqueous polyimide precursor solution composition is preferred because of having high environmental acceptability as compared with a polyimide precursor solution composition comprising an organic solvent. The production method of the present invention does not require any solvent other than water, and therefore it may provide an aqueous polyimide precursor solution composition having a lower content of organic solvent than the conventional compositions, and may provide an aqueous polyimide precursor solution composition containing an aqueous solvent and containing no organic solvent, which has higher environmental acceptability. In addition, a polyimide may be suitably obtained from the aqueous polyimide precursor solution composition. A polyimide obtained from a specific aqueous polyimide ...

Examples

example 1

[0155]In a 500 mL (internal volume) glass reaction vessel equipped with a stirrer and a nitrogen-gas charging / discharging tube was placed 425 g of water as a solvent. And then, 20.97 g (0.184 mol) of t-CHDA, and 44.14 g (1.25 equivalents per carboxyl group) of 1,2-DMZ were added thereto, and the mixture was stirred at 25° C. for 1 hour to dissolve these compounds in water. Subsequently, 54.03 g (0.184 mol) of s-BPDA was added to the resulting solution, and the mixture was stirred at 70° C. for 6 hours to provide an aqueous polyimide precursor solution having a solid content of 12.8 wt %, a solution viscosity of 1.2 Pa·s, and an inherent viscosity of 0.72.

[0156]The aqueous polyimide precursor solution composition obtained was applied on a glass plate as a substrate with a bar coater. The resulting coating film was deaerated and predried at 25° C. for 30 minutes under reduced pressure. Subsequently, the predried coating film was placed into a hot air dryer and heated at 80° C. for 30 ...

example 2

[0158]In a 500 mL (internal volume) glass reaction vessel equipped with a stirrer and a nitrogen-gas charging / discharging tube was placed 425 g of water as a solvent. And then, 21.24 g (0.183 mol) of HMD, and 43.92 g (1.25 equivalents per carboxyl group) of 1,2-DMZ were added thereto, and the mixture was stirred at 25° C. for 1 hour to dissolve these compounds in water. Subsequently, 53.76 g (0.183 mol) of s-BPDA was added to the resulting solution, and the mixture was stirred at 70° C. for 6 hours to provide an aqueous polyimide precursor solution having a solid content of 12.4 wt %, a solution viscosity of 0.7 Pa·s, and an inherent viscosity of 0.63.

[0159]The aqueous polyimide precursor solution composition obtained was applied on a glass plate as a substrate with a bar coater. The resulting coating film was deaerated and predried at 25° C. for 30 minutes under reduced pressure. Subsequently, the predried coating film was placed into a hot air dryer and heated at 80° C. for 30 min...

example 3

[0161]In a 500 mL (internal volume) glass reaction vessel equipped with a stirrer and a nitrogen-gas charging / discharging tube was placed 425 g of water as a solvent. And then, 17.29 g (0.196 mol) of DAB, and 47.15 g (1.25 equivalents per carboxyl group) of 1,2-DMZ were added thereto, and the mixture was stirred at 25° C. for 1 hour to dissolve these compounds in water. Subsequently, 57.71 g (0.196 mol) of s-BPDA was added to the resulting solution, and the mixture was stirred at 70° C. for 6 hours to provide an aqueous polyimide precursor solution having a solid content of 12.2 wt %, a solution viscosity of 0.3 Pa·s, and an inherent viscosity of 0.45.

[0162]The aqueous polyimide precursor solution composition obtained was applied on a glass plate as a substrate with a bar coater. The resulting coating film was deaerated and predried at 25° C. for 30 minutes under reduced pressure. Subsequently, the predried coating film was placed into a hot air dryer and heated at 80° C. for 30 min...

TECHNICAL FIELD

[0001] The present invention relates to an aqueous polyimide precursor solution composition and a method for easily producing an aqueous polyimide precursor solution composition. The aqueous polyimide precursor solution composition is preferred because of having high environmental acceptability as compared with a polyimide precursor solution composition comprising an organic solvent. The production method of the present invention does not require any solvent other than water, and therefore it may provide an aqueous polyimide precursor solution composition having a lower content of organic solvent than the conventional compositions, and may provide an aqueous polyimide precursor solution composition containing an aqueous solvent and containing no organic solvent, which has higher environmental acceptability. In addition, a polyimide may be suitably obtained from the aqueous polyimide precursor solution composition. A polyimide obtained from a specific aqueous polyimide ...

Examples

example 1

[0155]In a 500 mL (internal volume) glass reaction vessel equipped with a stirrer and a nitrogen-gas charging / discharging tube was placed 425 g of water as a solvent. And then, 20.97 g (0.184 mol) of t-CHDA, and 44.14 g (1.25 equivalents per carboxyl group) of 1,2-DMZ were added thereto, and the mixture was stirred at 25° C. for 1 hour to dissolve these compounds in water. Subsequently, 54.03 g (0.184 mol) of s-BPDA was added to the resulting solution, and the mixture was stirred at 70° C. for 6 hours to provide an aqueous polyimide precursor solution having a solid content of 12.8 wt %, a solution viscosity of 1.2 Pa·s, and an inherent viscosity of 0.72.

[0156]The aqueous polyimide precursor solution composition obtained was applied on a glass plate as a substrate with a bar coater. The resulting coating film was deaerated and predried at 25° C. for 30 minutes under reduced pressure. Subsequently, the predried coating film was placed into a hot air dryer and heated at 80° C. for 30 ...

example 2

[0158]In a 500 mL (internal volume) glass reaction vessel equipped with a stirrer and a nitrogen-gas charging / discharging tube was placed 425 g of water as a solvent. And then, 21.24 g (0.183 mol) of HMD, and 43.92 g (1.25 equivalents per carboxyl group) of 1,2-DMZ were added thereto, and the mixture was stirred at 25° C. for 1 hour to dissolve these compounds in water. Subsequently, 53.76 g (0.183 mol) of s-BPDA was added to the resulting solution, and the mixture was stirred at 70° C. for 6 hours to provide an aqueous polyimide precursor solution having a solid content of 12.4 wt %, a solution viscosity of 0.7 Pa·s, and an inherent viscosity of 0.63.

[0159]The aqueous polyimide precursor solution composition obtained was applied on a glass plate as a substrate with a bar coater. The resulting coating film was deaerated and predried at 25° C. for 30 minutes under reduced pressure. Subsequently, the predried coating film was placed into a hot air dryer and heated at 80° C. for 30 min...

example 3

[0161]In a 500 mL (internal volume) glass reaction vessel equipped with a stirrer and a nitrogen-gas charging / discharging tube was placed 425 g of water as a solvent. And then, 17.29 g (0.196 mol) of DAB, and 47.15 g (1.25 equivalents per carboxyl group) of 1,2-DMZ were added thereto, and the mixture was stirred at 25° C. for 1 hour to dissolve these compounds in water. Subsequently, 57.71 g (0.196 mol) of s-BPDA was added to the resulting solution, and the mixture was stirred at 70° C. for 6 hours to provide an aqueous polyimide precursor solution having a solid content of 12.2 wt %, a solution viscosity of 0.3 Pa·s, and an inherent viscosity of 0.45.

[0162]The aqueous polyimide precursor solution composition obtained was applied on a glass plate as a substrate with a bar coater. The resulting coating film was deaerated and predried at 25° C. for 30 minutes under reduced pressure. Subsequently, the predried coating film was placed into a hot air dryer and heated at 80° C. for 30 min...

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