Patent ID: 7537656
Filing Date: 2009-05-26
Classification: C04B,C09K

Abstract:
1. A cement composition comprising: a secondary amine substituted with a carboxyl group for retarding a set time of the cement composition, wherein the secondary amine substituted with a carboxyl group comprises at least one secondary amine substitute with a carboxyl group selected from the group consisting of: an ethylenediamine-N,N′-disuccinic acid, a salt of an ethylenediamine-N,N′-disuccinic acid, a carboxymethylaspartic acid, a salt of a carboxymethylaspartic acid, an iminodisuccinic acid, a salt of an iminodisuccinic acid, a methylglycinedisuccinic acid, a salt of a methylglycinedisuccinic acid, a 3-hydroxy N,N′iminodisuccinic acid, a salt of a 3-hydroxy N,N′-iminodisuccinic acid, copolymers thereof, terpolymers thereof, block polymers thereof, and combinations thereof.