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

a technology of aqueous polyimide and solution composition, which is applied in the direction of electrochemical generators, cell components, electrolytic capacitors, etc., can solve the problems of limited application, high cost, and inability to meet the requirements of aqueous polyimide solution composition, etc., and achieves easy production, high environmental acceptability, and easy production

Inactive Publication Date: 2013-07-04
UBE IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a method for easily producing an aqueous polyimide precursor solution composition, which has higher environmental acceptability and can be directly used without a solvent other than water. The composition contains a polyamic acid and a polyimide precursor having a high molecular weight, and has good properties such as heat resistance, mechanical strength, electrical properties, and solvent resistance. The composition can be used to produce various parts for precision machines, flexible printed wiring boards, and batteries. The invention also provides a binder resin composition for electrodes which has high environmental acceptability and excellent properties such as heat resistance, mechanical strength, electrical properties, and solvent resistance.

Problems solved by technology

The polyamic acid solution composition to produce a polyimide contains an organic solvent and must be subjected to heat treatment at a high temperature, and therefore the polyamic acid solution composition is not necessarily environmentally friendly and in some cases, its application is limited.
Thus, extremely complicated operations are needed.
Moreover, an organic solvent cannot be completely removed from a water-soluble polyimide precursor prepared in the organic solvent.
That is, in a battery environment, a liquid electrolyte will contain lithium methoxide, which is strongly alkaline and may adversely affect a binder resin.

Method used

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

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examples

[0197]Hereinafter, the present invention will be more specifically described with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples.

[0198]The methods for measuring the properties, which was used in the following examples, will be described below.

[0199]A sample solution (the weight is referred to as “w1”) was heated at 120° C. for 10 minutes, 250° C. for 10 minutes, and then 350° C. for 30 minutes in a hot air dryer, and the weight of the sample after the heat treatment (the weight is referred to as “w2”) was measured. The solid content [wt %] was calculated by the following formula.

Solid content [wt %]=(w2 / w1)×100

[0200]A sample solution was diluted to a concentration of 0.5 g / dl based on the solid content (the solvent: water). The flowing time (T1) of the diluted solution was measured at 30° C. using a Cannon-Fenske viscometer No. 100. The inherent viscosity was calculated by the following formula using the flowing time (T0) o...

example a1

[0231]In a 500 mL (internal volume) glass reaction vessel equipped with a stirrer and a nitrogen-gas charging / discharge tube was placed 450 g of water as a solvent. And then, 13.44 g (0.124 mol) of PPD and 29.87 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, 36.56 g (0.124 mol) of s-BPDA was added to the resulting solution, and the mixture was stirred at 25° C. for 12 hours to provide an aqueous polyimide precursor solution having a solid content of 9.0 wt %, a solution viscosity of 16.3 Pa·s, and an inherent viscosity of 0.95.

[0232]The properties of the aqueous polyimide precursor solution composition and the polyimide film obtained are shown in Table 1.

example a2

[0233]In a 500 mL (internal volume) glass reaction vessel equipped with a stirrer and a nitrogen-gas charging / discharge tube was placed 450 g of water as a solvent. And then, 13.44 g (0.124 mol) of PPD and 29.87 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, 36.56 g (0.124 mol) of s-BPDA was added to the resulting solution, and the mixture was stirred at 50° C. for 8 hours to provide an aqueous polyimide precursor solution having a solid content of 9.1 wt %, a solution viscosity of 35.5 Pa·s, and an inherent viscosity of 1.25.

[0234]The properties of the aqueous polyimide precursor solution composition and the polyimide film obtained are shown in Table 1.

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Abstract

A method for producing an aqueous polyimide precursor solution composition, including reacting a tetracarboxylic dianhydride and a diamine, which has a solubility in water at 25° C. of 0.1 g / L or more, in the presence of an imidazole, using water as a reaction solvent to provide an aqueous polyimide precursor solution composition.

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. An aromatic polyimide obtained from a specific aqueous...

Claims

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Application Information

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IPC IPC(8): C08L79/00H01G11/48
CPCC08G73/1067C08G73/1071C08L79/08H01M4/622H01M10/0525C08K5/3445H01G11/48C08L79/00Y02E60/10C08G73/10
Inventor NAKAYAMA, TAKESHIGENAKAYAMA, TOMONORITAKASAKI, SUSUMUKAWABATA, AKIRASONOYAMA, KENJI
Owner UBE IND LTD
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