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Polyimide-polybenzoxazole precursor solution, polyimide-polybenzoxazole film, and preparation method therefor

a polyimide and polybenzoxazole technology, applied in the field of polyimidepolybenzoxazole precursor solution, polyimidepolybenzoxazole film, and the same, can solve the problems of reducing light transmittance, increasing birefringence, and difficult to utilize it for optical members, and achieves high optical properties, superior heat resistance and birefringence, and the effect of increasing the number of conjugated double bonds

Inactive Publication Date: 2018-07-12
KOLON IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is about a method to create a film with good heat resistance and optical properties by using a polyimide-polybenzoxazole precursor solution that includes polyhydroxyamide and polyamic acid. The solution is then created through ring-closing dehydration to complete the film. The resulting film has both polybenzoxazole and polyimide unit structures, which increase its heat resistance without compromising its yellow index and optical properties. The amount of polyhydroxyamide in the precursor solution should be between 20 to 80 mol%.

Problems solved by technology

Additionally, it tends to take on a yellowish color, which decreases light transmittance and increases birefringence, making it difficult to utilize it for optical members.
Here, the above polyimide has high transparency but deteriorated thermal and mechanical properties.

Method used

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  • Polyimide-polybenzoxazole precursor solution, polyimide-polybenzoxazole film, and preparation method therefor

Examples

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example 1

[0077]After a 500 ml reactor equipped with a stirrer, a nitrogen injector, a dropping funnel, a temperature controller and a condenser was purged with nitrogen, 284.867 g of N-methyl-2-pyrrolidone (NMP) was placed in the reactor and 7.398 g (0.022 mol) of 6FAP was dissolved therein, after which 4.466 g (0.022 mol) of IPC was added thereto at 10° C. and allowed to react for 2 hr. Thereafter, 28.180 g (0.088 mol) of TFDB was dissolved therein, after which 15.535 g (0.053 mol) of BPDA was added thereto and allowed to react for 5 hr, and 15.638 g (0.035 mol) of 6FDA was added thereto. The resulting solution was maintained at room temperature and allowed to react for 18 hr, thereby obtaining a solution having a solid content of 20 wt % and a viscosity of 202 poise. After termination of the reaction, the obtained solution was applied onto a stainless steel plate, cast to a thickness of 10˜20 μm, dried with hot air at 80° C. for 20 min, at 120° C. for 20 min and at 300° C. for 10 min, grad...

example 2

[0078]After a 500 ml reactor equipped with a stirrer, a nitrogen injector, a dropping funnel, a temperature controller and a condenser was purged with nitrogen, 272.971 g of N-methyl-2-pyrrolidone (NMP) was placed in the reactor and 14.795 g (0.044 mol) of 6FAP was dissolved therein, after which 8.933 g (0.044 mol) of IPC was added thereto at 10° C. and allowed to react for 2 hr. Thereafter, 21.135 g (0.066 mol) of TFDB was dissolved therein, after which 11.651 g (0.040 mol) of BPDA was added thereto and allowed to react for 5 hr, and 11.728 g (0.026 mol) of 6FDA was added thereto. The resulting solution was maintained at room temperature and allowed to react for 18 hr, thereby obtaining a solution having a solid content of 20 wt % and a viscosity of 187 poise. After termination of the reaction, the obtained solution was applied onto a stainless steel plate, cast to a thickness of 10˜20 μm, dried with hot air at 80° C. for 20 min, at 120° C. for 20 min and at 300° C. for 10 min, gra...

example 3

[0079]After a 500 ml reactor equipped with a stirrer, a nitrogen injector, a dropping funnel, a temperature controller and a condenser was purged with nitrogen, 261.075 g of N-methyl-2-pyrrolidone (NMP) was placed in the reactor and 22.193 g (0.066 mol) of 6FAP was dissolved therein, after which 13.399 g (0.066 mol) of IPC was added thereto at 10° C. and allowed to react for 2 hr. Thereafter, 14.090 g (0.044 mol) of TFDB was dissolved therein, after which 7.767 g (0.026 mol) of BPDA was added thereto and allowed to react for 5 hr, and 7.819 g (0.018 mol) of 6FDA was added thereto. The resulting solution was maintained at room temperature and allowed to react for 18 hr, thereby obtaining a solution having a solid content of 20 wt % and a viscosity of 161 poise. After termination of the reaction, the obtained solution was applied onto a stainless steel plate, cast to a thickness of 10˜20 μm, dried with hot air at 80° C. for 20 min, at 120° C. for 20 min and at 300° C. for 10 min, grad...

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Abstract

This invention relates to a polyimide-polybenzoxazole precursor solution, a polyimide-polybenzoxazole film, and a method of manufacturing the same, wherein a film manufactured using the polyimide-polybenzoxazole precursor solution of the invention is formed by copolymerizing a unit structure of diamine and dianhydride and a unit structure of diaminophenol and dicarbonyl chloride in an organic solvent, and is colorless and transparent, like conventional polyimide films, and can exhibit improved heat resistance and low birefringence.

Description

TECHNICAL FIELD[0001]The present invention relates to a polyimide-polybenzoxazole precursor solution, a polyimide-polybenzoxazole film, and a method of manufacturing the same.BACKGROUND ART[0002]A polyimide (PI) film is generally formed from a polyimide resin. Here, “polyimide resin” refers to a highly heat-resistant resin prepared by subjecting an aromatic dianhydride and an aromatic diamine or an aromatic diisocyanate to solution polymerization, thus preparing a polyamic acid derivative, which is then subjected to ring-closing dehydration at a high temperature so as to be imidized.[0003]Such a polyimide film has excellent mechanical properties, heat resistance and electrical insulating properties, and is thus widely utilized in the fields of electronic materials, such as semiconductor insulating layers, electrode-protecting films for TFT-LCDs, substrates for flexible printed wiring boards, and the like.[0004]However, a polyimide resin is brown- or yellow-colored, attributable to i...

Claims

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Application Information

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IPC IPC(8): C08G73/22C08L79/08C08G61/12
CPCC08G73/22C08L79/08C08G61/122C08L2203/16C08L2201/10C08J5/18C08G73/1042C08G73/1039C08G73/1057C08G73/1067C08G73/1071C08J2379/04C08J2379/08
Inventor CHOI, DOO LIJUNG, HAK GEE
Owner KOLON IND INC
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