Workability of an aqueous formulation with a hydraulic binder base using a combination of comb-branched polymers

7- The method according to claim 1, wherein said comb-branched copolymer a) comprises, expressed as a percentage by weight of each of its monomers, the sum of those percentages being equal to 100%:

• a1) 5% to 30% of (meth)acrylic acid,
• a2) 70% to 95% of at least one monomer having the formula (I):
• where:
• m, n, p and q are whole numbers and m, n, p are less than 150, q is greater than 0, and at least one whole number of m, n and p is not 0;
• R is a radical that includes a polymerizable unsaturated function;
• R1 and R2 are identical or different, and represent hydrogen or alkyl,
• R′ represents hydrogen or a hydrocarbon radical having 1 to 3 carbons, or an ionic or ionizable group,
• a3) 0% to 50% of at least one monomer different from monomers a1) and a2), and which is selected from the group consisting of an ester, an amide, an ether, a styrenic monomer, a cationic monomer, a sulfonated monomer, a phosphated monomer.

10- The method according to claim 1, wherein said comb-branched copolymer b) comprises, expressed as a percentage by weight of each of its monomers, the sum of those percentages being equal to 100%:

• b1) 30% to 95% of (meth)acrylic acid,
• b2) 5% to 70% of at least one monomer having the formula (I):
• (I)
• where:
• m, n, p and q are whole numbers and m, n, p are less than 150, q is greater than 0, and at least one whole number of m, n and p is not 0;
• R is a radical that includes a polymerizable unsaturated function;
• R1 and R2 are identical or different, and represent hydrogen or alkyl,
• R′ represents a hydrocarbon radical having 8 to 36 carbon atoms,
• b3) 0% to 50% of at least one monomer different from monomers a1) and a2) selected from the group consisting of an ester, an amide, an ether, a styrenic monomer, a cationic monomer, a sulfonated monomer, and a phosphated monomer.

The formulation according to claim 15, wherein said comb-branched copolymer a) comprises, expressed as a percentage by weight of each of its monomers, the sum of those percentages being equal to 100%:

• a1) 5% to 30% of (meth)acrylic acid,
• a2) 70% to 95% of at least one monomer having the formula (I):
• where:
• m, n, p and q are whole numbers and m, n, p are less than 150, q is greater than 0, and at least one whole number of m, n and p is not 0;
• R is a radical that includes a polymerizable unsaturated function;
• R1 and R2 are identical or different, and represent hydrogen or alkyl,
• R′ represents hydrogen or a hydrocarbon radical having 1 to 3, or an ionic or ionizable group,
• a3) 0% to 50% of at least one monomer different from monomers a1) and a2), and which is selected from the group consisting of an ester, an amide, an ether, a styrenic monomer, a cationic monomer, a sulfonated monomer, and a phosphated monomer.

The formulation according to claim 15, wherein said comb-branched copolymer b) comprises, expressed as a percentage by weight of each of its monomers, the sum of those percentages being equal to 100%:

• b1) 30% to 95% of (meth)acrylic acid,
• b2) 5% to 70% of at least one monomer having the formula (I):
• where:
• m, n, p and q are whole numbers and m, n, p are less than 150, q is greater than 0, and at least one whole number of m, n and p is not 0;
• R is a radical that includes a polymerizable unsaturated function;
• R1 and R2 are identical or different, and represent hydrogen or alkyl,
• R′ represents a hydrocarbon radical having 8 to 36 carbon atoms,
• b3) 0% to 50% of at least one monomer different from monomers a1) and a2), and which is selected from the group consisting of an ester, an amide, an ether, a styrenic monomer, a cationic monomer, a sulfonated monomer, and a phosphated monomer.