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US 5,491,212 AGranted
Method for preparing polysuccinimides using a rotary tray dryer
AssigneeRohm and Haas Company
InventorsYi H. Paik, Ethan S. Simon, Graham Swift
Life of this patent
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Abstract
A method for producing polysuccinimides is provided. A rotary tray dryer operating at an internal temperature of from about 110.degree. to about 300.degree. C. and providing a residence time of from about 1 hour to about 10 hours is used in the polycondensation of one or more amino acids, amic acids or ammonium salts of monoethylenically unsaturated dicarboxylic acids to produce polysuccinimides.
Claims14
A continuous method for producing polysuccinimides comprising the steps of:
- continuously introducing into a rotary tray dryer one or more compounds selected from the group consisting of amic acids and ammonium salts of monoethylenically unsaturated dicarboxylic acids, wherein the amic acids are monoamides of monoethylenically unsaturated dicarboxylic acids;
- and wherein .alpha.-amino acids are not introduced into the rotary tray dryer;
- operating the rotary tray dryer so as to provide an internal temperature of from about 120.degree. to about 300.degree. C. and a residence time of from about 1 hour to about 10 hours;
- and
- removing the water formed by condensation of the one or more compounds to produce polysuccinimides.
2 more elements
A continuous method for producing poly(amino acids) comprising the steps of:
- continuously introducing into a rotary tray dryer one or more compounds selected from the group consisting of .alpha.-amino acids, amic acids and ammonium salts of monoethylenically unsaturated dicarboxylic acids;
- wherein the amic acids are monoamides of monoethylenically unsaturated dicarboxylic acids;
- operating the rotary tray dryer so as to provide an internal temperature of from about 120.degree. to about 300.degree. C. and a residence time of from about 1 hour to about 10 hours;
- removing the water formed by condensation of the one or more compounds to produce polysuccinimides;
- and
- hydrolyzing the polysuccinimide to form poly(amino acids).
3 more elements
Dependencies are inferred from the claim text.