Copolymers of polyaspartic acid and polycarboxylic acids and...

Details Copolymers of polyaspartic acid and polycarboxylic acids and... Copolymers of polyaspartic acid and polycarboxylic acids and...

C - Chemistry, Metallurgy

08

G

C08G 69/36 (2006.01) C02F 5/12 (2006.01) C08G 69/10 (2006.01) C08G 69/26 (2006.01) C08G 69/28 (2006.01) C08G 73/10 (2006.01)

Patent

CA 2495360

Copolymers of polyaspartic acid which are suitable for the inhibition of scale deposition were obtained by reacting maleic acid, an additional polycarboxylic acid and ammonia in a stoichiometric excess, at 120-350°C, preferably 180-300°C, to provide copolymers of polysuccinimide. In a second embodiment, a polyamine was added to the reaction mix. These intermediate polysuccinimide copolymers could then be converted to the salts of copolymers of polyaspartic acid by hydrolysis with a hydroxide. Such copolymers are useful in preventing deposition of scale from water and find applications in treating water. Other applications include scale prevention additives for detergents. In addition, such copolymers inhibit dental tartar and plaque formation.

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