Alkalische Hydrolyse von Polyimiden
1,154,480. Aromatic tetracarboxylic acids and diamines. E. I. DU PONT DE NEMOURS & CO. 5 Jan., 1967 [6 Jan., 1966], No. 754/67. Heading C2C. [Also in Division C3] Aromatic tetracarboxylic acids and aromatic diamines are obtained by hydrolysing scrap polyimide in 1 to 30 wt. per cent aqueous ammo...
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| creator | FARR IZARD,EMMETTE BRYAN LINDSEY,WILLIAM |
| description | 1,154,480. Aromatic tetracarboxylic acids and diamines. E. I. DU PONT DE NEMOURS & CO. 5 Jan., 1967 [6 Jan., 1966], No. 754/67. Heading C2C. [Also in Division C3] Aromatic tetracarboxylic acids and aromatic diamines are obtained by hydrolysing scrap polyimide in 1 to 30 wt. per cent aqueous ammonia or alkali metal hydroxide in sufficient amount to provide at least 2 moles OH per mole imide N at 100 to 200 C.; precipitating the diamine by cooling and separating it from the mother liquor; precipitating tetracarboxylic acid with a mineral acid, and separating the precipitated acid. The solution may be decolorized with carbon black. The application of the process to the polypyromellitimide of bis- (4-aminophenyl)-ether is exemplified and numerous other tetra-acids and diamines which can be similarly obtained are listed. |
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[Also in Division C3] Aromatic tetracarboxylic acids and aromatic diamines are obtained by hydrolysing scrap polyimide in 1 to 30 wt. per cent aqueous ammonia or alkali metal hydroxide in sufficient amount to provide at least 2 moles OH per mole imide N at 100 to 200 C.; precipitating the diamine by cooling and separating it from the mother liquor; precipitating tetracarboxylic acid with a mineral acid, and separating the precipitated acid. The solution may be decolorized with carbon black. 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| title | Alkalische Hydrolyse von Polyimiden |
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