Method of producing polymers of aspartic acid and the use of...

C - Chemistry – Metallurgy – 08 – G

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C08G 69/08 (2006.01) B01F 17/00 (2006.01) C08G 69/10 (2006.01) C08G 73/06 (2006.01) C08G 73/10 (2006.01) C09B 67/46 (2006.01) C09D 17/00 (2006.01) C11D 3/37 (2006.01)

Patent

CA 2150350

Process for the preparation of polymers of aspartic acid by re- acting (a) maleic anhydride and (b) ammonia and/or primary or secondary amines without diluent in the (a) : (b) molar ratio of 1 : 0.1 to 1 : 3 to give monoamides of maleic acid, fumaric acid or their ammonium salts at up to 100°C and subsequent condensation of the reaction products, with or without compounds capable of cocondensation, at above 100°C and, where appropriate, hydrolysis of the condensates and use of the polymers as scale inhibitor, as dispersants for pigments and as additive to detergents and cleaners.

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