Composition comprising an aqueous polymer dispersion and a hydraulic binder
AssigneeArkema France
InventorsLeo Mario SAIJA, Mario LUGLI, Andrea PREMOLI, Luca PERINO, Umberto AMADEI
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Abstract
The present invention relates to a composition comprising A) an aqueous polymer dispersion which has been in contact with a specific redox system during and/or after polymerization; and B) a hydraulic binder. It further relates to a process for obtaining the composition and its use in the manufacture of a coating, an adhesive, a mortar, a putty or a sealant, in particular a waterproofing cementitious coating having low tackiness and high impermeability to water.
Claims21
A composition comprising:
- A) an aqueous polymer dispersion;
- and
- B) a hydraulic binder;
- wherein the aqueous polymer dispersion is obtained by emulsion polymerization of a monomeric composition comprising:
- ethylenically unsaturated monomers;
- at least one surfactant;
- and
- at least one initiator;
- and the aqueous polymer dispersion comprises a residue of a reducing agent selected from polyunsaturated carboxylic acids, hydroxylated carboxylic acids and mixtures thereof.
A process for the preparation of a composition comprising the following steps:
- i) preparing an aqueous polymer dispersion by emulsion polymerization of a monomeric composition comprising
- ethylenically unsaturated monomers;
- at least one surfactant;
- and
- at least one initiator;
- ii) adding a chase to the aqueous polymer dispersion obtained in step i) as a post-polymerization treatment,
- iii) mixing the aqueous polymer dispersion obtained in step ii) with a hydraulic binder;
- wherein the initiator of step i) and/or the chase of step ii) comprises a redox system comprising a peroxide and a reducing agent selected from polyunsaturated carboxylic acids, hydroxylated carboxylic acids and mixtures thereof.
(canceled)
A redox system for increasing the impermeability and/or reducing the tackiness of a composite material obtained from an aqueous polymer dispersion and a hydraulic binder, wherein the redox system comprises a peroxide and a reducing agent selected from polyunsaturated carboxylic acids, hydroxylated carboxylic acids and mixtures thereof.
Dependencies are inferred from the claim text.