Polyimide film with improved thermal stability
A technology of polyimide film and film forming process, applied in transportation and packaging, synthetic resin layered products, chemical instruments and methods, etc. The effect of excellent thermal stability
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Embodiment 1
[0056] 599 grams of N,N-dimethylacetamide (DMAc) was placed in a one-liter reactor equipped with a stirrer, nitrogen inlet, dropping funnel, temperature controller, and condenser while passing nitrogen through the reactor , the temperature of the reactor was adjusted to 25°C, 64.046 g (0.2 mol) of bis-trifluoromethylbenzidine (TFDB) was dissolved therein, and then the solution was maintained at a temperature of 25°C. Further, 5.8544 g (0.02 mol) of biphenyltetracarboxylic dianhydride (BPDA) was added and the reaction solution was stirred for 1 hour, thereby completely dissolving the biphenyltetracarboxylic dianhydride (BPDA). During this time, the temperature of the solution was maintained at 25°C. Furthermore, 79.96 g (0.18 mol) of 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA) was added, thereby obtaining a polyamide having a solid content of 20% by weight acid solution.
[0057] Thereafter, the polyamic acid solution was stirred at room temperature for 8...
Embodiment 2
[0061] As described in Example 1, 587.5 grams of N,N-dimethylacetamide (DMAc) was placed in the reactor, the temperature of the reactor was adjusted to 25° C., and 64.046 grams (0.2 mol) of bis- Trifluoromethylbenzidine (TFDB) was dissolved therein, after which the solution was maintained at a temperature of 25°C. Further, 11.768 g (0.04 mol) of biphenyltetracarboxylic dianhydride (BPDA) was added and the reaction solution was stirred for 1 hour, thereby completely dissolving the biphenyltetracarboxylic dianhydride (BPDA). The temperature of the solution was maintained at 25°C. Further, 71.08 g (0.16 mol) of 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA) was added, whereby a polyamic acid solution having a solid content of 20 wt % was obtained.
[0062]Thereafter, the polyamic acid solution was stirred at room temperature for 8 hours, 31.64 g of pyridine and 40.91 g of acetic anhydride were added, stirred for 30 minutes, further stirred at 80° C. for 2 hours...
Embodiment 3
[0065] As described in Example 1, 575 grams of N,N-dimethylacetamide (DMAc) was placed in the reactor, the temperature of the reactor was adjusted to 25° C., and 64.046 grams (0.2 mol) of bis- Trifluoromethylbenzidine (TFDB) was dissolved therein, after which the solution was maintained at a temperature of 25°C. Further, 17.65 g (0.06 mol) of biphenyltetracarboxylic dianhydride (BPDA) was added and the reaction solution was stirred for 1 hour, thereby completely dissolving the biphenyltetracarboxylic dianhydride (BPDA). During this time, the temperature of the solution was maintained at 25°C. Further, 62.19 g (0.14 mol) of 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA) was added, thereby obtaining a polyamic acid solution having a solid content of 20 wt%.
[0066] Thereafter, the polyamic acid solution was stirred at room temperature for 8 hours, 31.64 g of pyridine and 40.91 g of acetic anhydride were added, stirred for 30 minutes, further stirred at 80° C....
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