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US 5,096,999 AGranted
Catalytic preparation of hydroxypolyamides
AssigneeSiemens Aktiengesellschaft
InventorsAhne Hellmut, Peter Baeuerlein, Albert Hammerschmidt
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Abstract
Hydroxypolyamides can be obtained in a simple and economical way in a chloride-free manner when (a) aromatic amino hydroxy carboxylic acids or (b) aromatic diaminodihydroxy compounds and aromatic dicarboxylic acids or (c) aromatic diaminodihydroxy compounds, aromatic dicarboxylic acids and aromatic amino hydroxy carboxylic acids are converted in the presence of 1-ethoxycarbonyl-2-ethoxy-1.2-dihydroquinoline, 1-1'-carbonyldioxy-di-1.2.3-benzotriazole or dicyclohexyl carbodiimide/1-hydroxy-1.2.3-benzotriazole.
Claims6
A method for preparing hydroxpolyamides having the following structure:
- ##STR6## where R, R*, R.sub.1, R*.sub.1 and R.sub.2 are aromatic groups and where:
- n.sub.1 and n.sub.2 =1 to 100, n.sub.3 =0 or
- n.sub.2 =1 to 100, n.sub.1 and n.sub.3 =0 or
- n.sub.1, n.sub.2 and n.sub.3 1 to 100, n.sub.2 =0, where at least one of the following holds:
- R is other than R*, and R.sub.1 is other than R*.sub.1 comprising the step of reacting at least one aromatic diaminohydroxy compound and at least one aromatic dicarboxylic acid in the presence of 1-ethoxycarbonyl-2-ethoxy-1,2-dihydroquinoline, 1,1'-carbonyldioxy-di-1,2,3-benzotriazole or dicyclohexyl carbodiimide/1-hydroxy-1,2,3-benzotriazole.
2 more elements
Dependencies are inferred from the claim text.