PREPARATION OF POLYSUCCINIMIDE, POLYASPARTIC ACID AND SALT THEREOF, AND THE USE OF THESE COMPOUNDS

Japanese Patent JP3178955

B2

PURPOSE: To obtain a polyaspartic acid useful for a dispersant, a microbiocide, etc., by reacting maleic anhydride with NH3, thermally polymerizing the resultant maleamic acid under specified conditions, and hydrolyzing the resultant polysuccinimide to covert into polyaspartic acid or a salt thereof.
CONSTITUTION: Maleic anhydride, optionally together with a solvent (e.g. toluene), is charged into an autoclave, heated under stirring to 60°C for 0.5 hr, and is reacted with a dry ammonia gas introduced under a pressure of 0.6 bar at a temp. of 60-70°C. The resultant maleamic acid is continuously thermally polymerized at a temp. of 100-350°C for an average dwell time of 0.5-30 min in a reactor to give polysuccinimide, which is then hydrolyzed, at need, to be converted into polyaspartic acid or a salt thereof. Thus, the objective compd., which is useful as a dispersant, a cleaning additive, a sequestering agent, a scale inhibitor, a corrosion preventive, a microbiocide, a fertilizer, etc., is obtained.

Torsten Grot
Vinfried Eentgen
Hans Berner Linden
Nicolaus Miura
Heinz-Joachim Roter
Paul Bagner
Martin Kukuler

JP34453893A

June 25, 2001

December 20, 1993

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Bayer Actien Gezershyaft

A01N37/30; A01N37/32; A01N37/46; C02F5/00; C02F5/08; C02F5/10; C02F5/12; C02F5/14; C05C11/00; C05G3/00; C08G69/00; C08G69/10; C08G73/06; C08G73/10; C09K15/20; C09K23/00; C09K23/22; C09K23/52; C11D3/37; C23F11/14; C23F11/173; (IPC1-7): C08G69/00; A01N37/46; B01F17/52; C02F5/10; C05C11/00; C09K15/20; C11D3/37; C23F11/14

JP6145350A

Heikichi Odashima

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