Polyimide film
A polyimide film and film technology, applied in the direction of circuit substrate materials, printed circuit components, etc., can solve the problems of low transmission efficiency of high-frequency signals, not easy to accelerate circuit operation, low response speed, etc., to achieve low loss, The effect of excellent thermal degradation stability and fast response speed
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Embodiment 1-4
[0279] (Example 1-4, Comparative Example 1-3)
preparation Embodiment -1
[0281] A reaction vessel equipped with a nitrogen inlet tube, a thermometer, and a stirring bar was purged with nitrogen, and 500 parts by mass of 5-amino-2-(p-aminophenyl)benzoxazole was added thereto. Then, 9000 parts by mass of N-methyl-2-pyrrolidone was added, and after complete dissolution, 485 parts by mass of pyromellitic dianhydride was added. The mixture was stirred at 25° C. for 50 hours to obtain a brown viscous polyamic acid solution. The reduced viscosity (ηsp / C) is 4.6dl / g.
[0282]
[0283] The polyamic acid solution was coated onto a stainless steel belt (squeegee / bandgap 650 μm) and dried at 90° C. for 60 minutes. After drying, the self-supporting polyamic acid film was peeled off from the stainless steel belt to obtain a raw film with a thickness of 40 μm.
[0284] The resulting green film was passed through a nitrogen-purged continuous type heat treatment furnace, and heated in two steps under the conditions described in Table 1 to perform imidization re...
preparation Embodiment -2
[0288] Clean the reaction vessel equipped with nitrogen inlet pipe, thermometer and stirring bar with nitrogen, and 5-amino-2-(p-aminophenyl) benzoxazole (formula 1, 450 parts by mass) and 5-amino-2 -(m-aminophenyl)benzoxazole (Formula 3, 50 parts by mass) was put therein. Then, 9100 parts by mass of N,N-dimethylacetamide was added, and after complete dissolution, 485 parts by mass of pyromellitic dianhydride was added. The mixture was stirred at 25° C. for 40 hours to obtain brown viscous polyamic acid solution A. Its ηsp / C was 4.0dl / g.
[0289]
[0290] The polyamic acid solution was coated onto a stainless steel belt (squeegee / bandgap 650 μm) and dried at 90° C. for 60 minutes. After drying, the self-supporting polyamic acid film was peeled off from the stainless steel belt to obtain a raw film with a thickness of 40 μm. The amount of residual solvent in the green film was then 35% by mass.
[0291] Pass the obtained raw film through a continuous drying furnace and he...
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