Use as an agent improving the workability of an aqueous formulation with a hydraulic binder base, of a (meth)acrylic comb-branched copolymer and an associative acrylic thickener

Patent metadata

Field	Value
Publication number	US-9850374-B2
Application number	US-201414510186-A
Country	US
Kind code	B2
Filing date	Oct 9, 2014
Priority date	Dec 8, 2008
Publication date	Dec 26, 2017
Grant date	Dec 26, 2017

Abstract

The present invention pertains to the use, in the manufacture of an aqueous formulation with a hydraulic binder base, of a combination of at least one comb-branched copolymer having a (meth)acrylic skeleton, onto which are grafted side-chains terminated by a hydrophilic group, and at least one ASE acrylic polymer. This results in improving the workability of said formulation, without causing a segregation phenomenon.

First claim

The invention claimed is:

1. A method of forming an aqueous formulation comprising a hydraulic binder base having improved workability, the method comprising mixing a combination with said hydraulic binder base,
wherein the combination comprises:
A) an aqueous solution comprising water and a comb-branched (meth)acrylic copolymer that comprises, expressed as a percentage by weight of each of its monomers:
a1) 5% to 30% of (meth)acrylic acid,
a2) 70% to 95% of at least one monomer of formula (I):

wherein:
m, n, p, and q are whole numbers and m, n, and p are less than 150, q is greater than 0, and at least one whole numbers among m, n, and p is nonzero;
R is a radical comprising a polymerizable unsaturated function;
R 1 and R 2 are identical or different, and represent a hydrogen atom or an alkyl group,
R′ represents hydrogen, or a hydrocarbonated radical having 1 to 40 carbon atoms, or an ionic or ionizable group; and
a3) 0% to 50% of at least one monomer different from monomers a1) and a2), wherein a sum of percentages of a1), a2), and a3) equals 100%; and

B) an aqueous solution comprising water and an ASE acrylic polymer consisting of 55 wt. % methacrylic acid and 45% wt. % ethyl acrylate.

2. The method of claim 1 , wherein the aqueous formulation comprising a hydraulic binder base is a mortar.

3. The method of claim 1 , wherein the aqueous formulation comprising a hydraulic binder base is a concrete.

4. The method of claim 1 , wherein the aqueous formulation comprising a hydraulic binder base is a grout.

5. The method of claim 1 , wherein the aqueous formulation comprising a hydraulic binder base, after said mixing, remains workable for at least three hours.

6. The method according to claim 1 , wherein said aqueous formulation comprising a hydraulic binder base, after said mixing, has a 0.1 to 2% solids content of said comb-branched (meth)acrylic copolymer and ASE acrylic polymer in relation to a solid content of the hydraulic binder base.

7. The method according to claim 1 , wherein the comb-branched (meth)acrylic copolymer is fully or partially neutralized with at least one neutralization agent having a monovalent cation.

8. The method according to claim 1 , wherein the ASE acrylic polymer is fully or partially neutralized with at least one neutralization agent having a monovalent cation.

9. The method according to claim 7 , wherein the ASE acrylic polymer is fully or partially neutralized with at least one neutralization agent having a monovalent cation.

Assignees

• Coatex Sas

Inventors

• Platel David
• Moro Jean
• Guerret Olivier

Classifications

• C08L2205/02

  containing two or more polymers of the same C08L -group · CPC title

• C04B24/2641

  Polyacrylates; Polymethacrylates · CPC title

• C04B2103/32

  Superplasticisers · CPC title

• C04B2103/006

  Comb polymers · CPC title

• C04B24/2647

  containing polyether side chains · CPC title