Gypsum formulations

C - Chemistry – Metallurgy – 04 – B

Patent

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Details

C04B 24/26 (2006.01) C04B 28/14 (2006.01)

Patent

CA 2707151

A gypsum formulation, typically for producing a gypsum building board, is produced by adding to an aqueous gypsum slurry containing a water swellable clay, acomb- based copolymer fluidiser and a basic water-soluble polymer having pref-erential affinity for clay, and allowing a layer of theaqueous gypsum slurry to set.

L'invention concerne une formulation de plâtre, typiquement pour la production d'une plaque de plâtre pour construction, produite en ajoutant, à une suspension aqueuse de plâtre qui comprend une glaise capable de gonfler dans l'eau, un fluidiseur de copolymère à structure en peigne et un polymère basique soluble dans l'eau qui présente une affinité préférentielle pour la glaise, et en permettant à une couche de la suspension aqueuse de plâtre de prendre.

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