Use of a rheological additive in the manufacture by...

C - Chemistry – Metallurgy – 04 – B

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C04B 24/24 (2006.01) C04B 24/26 (2006.01) C04B 24/32 (2006.01)

Patent

CA 2671941

The present invention relates to the use, in a method for producing a composition containing water and a hydraulic binder, of a rheologic additive characterised in that it comprises an emulsion of at least one non cross-linked copolymer containing: a) (meth)acrylic acid; b) alkyl (meth)acrylate with 1 to 25 carbon atoms; c) a monomer of the formula Ri - (R2O)1n - R3, in which R1 is a radical containing un unsaturated polymerisable function, R2O is an alkylene oxide group with 1 to 6 carbon atoms; m is an interger between 20 and 33, preferably 23 and 27, and most preferably equal to 25; R3 is a linear or branched alkyl chain with 28 to 33, preferably 30 to 33 and most preferably 32 carbon atoms. The invention also relates to the formulations thus obtained.

La présente invention consiste en l'utilisation, dans un procédé de fabrication d'une composition à base d'eau et de liant hydraulique, d'un additif rhéologique caractérisé en ce qu'il est une émulsion d'au moins un copolymère non réticulé constitué : a) d'acide (méth)acrylique, b) de (méth)acrylate d'alkyle ayant de 1 à 25 atomes de carbone, c) d'un monomère de formule Ri - (R2O)1n - R3, où : - R1 désigne un radical contenant une fonction insaturée polymérisable,, - R2O désigne un groupe d'oxyde d'alkylène ayant de 1 à 6 atomes de carbone, - m est un entier compris entre 20 et 30, préférentiellement entre 23 et 27, et est très préférentiellement égal à 25, - R3 désigne une chaîne alkyle linéaire ou ramifiée ayant de 28 à 33, préférentiellement de 30 à 33, et ayant très préférentiellement 32 atomes de carbone. L'invention concerne aussi les formulations ainsi obtenues.

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