Fluidizing compounds for hydraulic compositions

A compound with the following formula (I):

• wherein:
• M is chosen from the group consisting of H, alkaline and alkaline earth metals and +HNRR′ groups, R and R′ being chosen independently from each other from H, (C1-C3) alkyl, either linear or branched, and alcohols in C1-C3, either linear or branched;
• R1 is chosen from the group consisting of H, A1 and (C1-C4) alkyl groups, either linear or branched, when A is described by formula (1) below, or, where A is described by formula (2) or (3) below, R1 is chosen from the group consisting of H and (C1-C4) alkyl groups, either linear or branched;
• R2 is chosen from the group consisting of H, OM, M being as defined above and from (C1-C4) alkyl groups, either linear or branched;
• A stands for:
• a group A1 with the following formula (1):
• wherein:
• n is an integer from 1 to 40;
• m is an integer from 1 to 40;
• and
• Z is chosen from the group consisting of:
• —CHR3—NH— groups, R3 being chosen from the group consisting of H, COOH and (C1-C6) alkyl groups, either linear or branched;
• —C(═O)—NH— groups;
• and
• —C(R5) ═N— groups, where R5 is H or Me;
• * a group A2 with the following formula (2):
• wherein:
• n is an integer from 1 to 40, preferentially from 1 to 31;
• m is an integer from 1 to 40, preferentially from 1 to 31;
• r is 0 or an integer from 1 to 6;
• and
• M, R1 and R2 are as defined above in formula (I);
• * a group A3 with the following formula (3):
• wherein:
• n′ is an integer from 1 to 50;
• the sum of m′+p′ varies from 1 to 6;
• m′ is an integer from 1 to 5;
• p′ is an integer from 1 to 5;
• and
• M, R1 and R2 are as defined above in formula (I);
• Z is as defined above in formula (1).